aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/cpqfcTSworker.c
blob: d822ddcc52b2cad83260fa8eed310542ec09933c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
/* Copyright(c) 2000, Compaq Computer Corporation 
 * Fibre Channel Host Bus Adapter 
 * 64-bit, 66MHz PCI 
 * Originally developed and tested on:
 * (front): [chip] Tachyon TS HPFC-5166A/1.2  L2C1090 ...
 *          SP# P225CXCBFIEL6T, Rev XC
 *          SP# 161290-001, Rev XD
 * (back): Board No. 010008-001 A/W Rev X5, FAB REV X5
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * Written by Don Zimmerman
*/

#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/stat.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/smp_lock.h>
#include <linux/pci.h>

#define SHUTDOWN_SIGS	(sigmask(SIGKILL)|sigmask(SIGINT)|sigmask(SIGTERM))

#include <asm/system.h>
#include <asm/irq.h>
#include <asm/dma.h>

#include "scsi.h"
#include <scsi/scsi_host.h>   // struct Scsi_Host definition for T handler
#include "cpqfcTSchip.h"
#include "cpqfcTSstructs.h"
#include "cpqfcTStrigger.h"

//#define LOGIN_DBG 1

// REMARKS:
// Since Tachyon chips may be permitted to wait from 500ms up to 2 sec
// to empty an outgoing frame from its FIFO to the Fibre Channel stream,
// we cannot do everything we need to in the interrupt handler.  Specifically,
// every time a link re-init (e.g. LIP) takes place, all SCSI I/O has to be
// suspended until the login sequences have been completed.  Login commands
// are frames just like SCSI commands are frames; they are subject to the same
// timeout issues and delays.  Also, various specs provide up to 2 seconds for
// devices to log back in (i.e. respond with ACC to a login frame), so I/O to
// that device has to be suspended.
// A serious problem here occurs on highly loaded FC-AL systems.  If our FC port
// has a low priority (e.g. high arbitrated loop physical address, alpa), and
// some other device is hogging bandwidth (permissible under FC-AL), we might
// time out thinking the link is hung, when it's simply busy.  Many such
// considerations complicate the design.  Although Tachyon assumes control
// (in silicon) for many link-specific issues, the Linux driver is left with the
// rest, which turns out to be a difficult, time critical chore.

// These "worker" functions will handle things like FC Logins; all
// processes with I/O to our device must wait for the Login to complete
// and (if successful) I/O to resume.  In the event of a malfunctioning or  
// very busy loop, it may take hundreds of millisecs or even seconds to complete
// a frame send.  We don't want to hang up the entire server (and all
// processes which don't depend on Fibre) during this wait.

// The Tachyon chip can have around 30,000 I/O operations ("exchanges")
// open at one time.  However, each exchange must be initiated 
// synchronously (i.e. each of the 30k I/O had to be started one at a
// time by sending a starting frame via Tachyon's outbound que).  

// To accommodate kernel "module" build, this driver limits the exchanges
// to 256, because of the contiguous physical memory limitation of 128M.

// Typical FC Exchanges are opened presuming the FC frames start without errors,
// while Exchange completion is handled in the interrupt handler.  This
// optimizes performance for the "everything's working" case.
// However, when we have FC related errors or hot plugging of FC ports, we pause
// I/O and handle FC-specific tasks in the worker thread.  These FC-specific
// functions will handle things like FC Logins and Aborts.  As the Login sequence
// completes to each and every target, I/O can resume to that target.  

// Our kernel "worker thread" must share the HBA with threads calling 
// "queuecommand".  We define a "BoardLock" semaphore which indicates
// to "queuecommand" that the HBA is unavailable, and Cmnds are added to a
// board lock Q.  When the worker thread finishes with the board, the board
// lock Q commands are completed with status causing immediate retry.
// Typically, the board is locked while Logins are in progress after an
// FC Link Down condition.  When Cmnds are re-queued after board lock, the
// particular Scsi channel/target may or may not have logged back in.  When
// the device is waiting for login, the "prli" flag is clear, in which case
// commands are passed to a Link Down Q.  Whenever the login finally completes,
// the LinkDown Q is completed, again with status causing immediate retry.
// When FC devices are logged in, we build and start FC commands to the
// devices.

// NOTE!! As of May 2000, kernel 2.2.14, the error recovery logic for devices 
// that never log back in (e.g. physically removed) is NOT completely
// understood.  I've still seen instances of system hangs on failed Write 
// commands (possibly from the ext2 layer?) on device removal.  Such special
// cases need to be evaluated from a system/application view - e.g., how
// exactly does the system want me to complete commands when the device is
// physically removed??

// local functions

static void SetLoginFields(
  PFC_LOGGEDIN_PORT pLoggedInPort,
  TachFCHDR_GCMND* fchs,
  BOOLEAN PDisc,
  BOOLEAN Originator);

static void AnalyzeIncomingFrame( 
       CPQFCHBA *cpqfcHBAdata,
       ULONG QNdx );

static void SendLogins( CPQFCHBA *cpqfcHBAdata, __u32 *FabricPortIds );

static int verify_PLOGI( PTACHYON fcChip,
      TachFCHDR_GCMND* fchs, ULONG* reject_explain);
static int verify_PRLI( TachFCHDR_GCMND* fchs, ULONG* reject_explain);

static void LoadWWN( PTACHYON fcChip, UCHAR* dest, UCHAR type);
static void BuildLinkServicePayload( 
              PTACHYON fcChip, ULONG type, void* payload);

static void UnblockScsiDevice( struct Scsi_Host *HostAdapter, 
        PFC_LOGGEDIN_PORT pLoggedInPort);

static void cpqfcTSCheckandSnoopFCP( PTACHYON fcChip, ULONG x_ID);

static void CompleteBoardLockCmnd( CPQFCHBA *cpqfcHBAdata);

static void RevalidateSEST( struct Scsi_Host *HostAdapter, 
		        PFC_LOGGEDIN_PORT pLoggedInPort);

static void IssueReportLunsCommand( 
              CPQFCHBA* cpqfcHBAdata, 
	      TachFCHDR_GCMND* fchs);

// (see scsi_error.c comments on kernel task creation)

void cpqfcTSWorkerThread( void *host)
{
  struct Scsi_Host *HostAdapter = (struct Scsi_Host*)host;
  CPQFCHBA *cpqfcHBAdata = (CPQFCHBA *)HostAdapter->hostdata; 
#ifdef PCI_KERNEL_TRACE
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
#endif
  DECLARE_MUTEX_LOCKED(fcQueReady);
  DECLARE_MUTEX_LOCKED(fcTYOBcomplete); 
  DECLARE_MUTEX_LOCKED(TachFrozen);  
  DECLARE_MUTEX_LOCKED(BoardLock);  

  ENTER("WorkerThread");

  lock_kernel();
  daemonize("cpqfcTS_wt_%d", HostAdapter->host_no);
  siginitsetinv(&current->blocked, SHUTDOWN_SIGS);


  cpqfcHBAdata->fcQueReady = &fcQueReady;  // primary wait point
  cpqfcHBAdata->TYOBcomplete = &fcTYOBcomplete;
  cpqfcHBAdata->TachFrozen = &TachFrozen;
    
 
  cpqfcHBAdata->worker_thread = current;
  
  unlock_kernel();

  if( cpqfcHBAdata->notify_wt != NULL )
    up( cpqfcHBAdata->notify_wt); // OK to continue

  while(1)
  {
    unsigned long flags;

    down_interruptible( &fcQueReady);  // wait for something to do

    if (signal_pending(current) )
      break;
    
    PCI_TRACE( 0x90)
    // first, take the IO lock so the SCSI upper layers can't call
    // into our _quecommand function (this also disables INTs)
    spin_lock_irqsave( HostAdapter->host_lock, flags); // STOP _que function
    PCI_TRACE( 0x90)
         
    CPQ_SPINLOCK_HBA( cpqfcHBAdata)
    // next, set this pointer to indicate to the _quecommand function
    // that the board is in use, so it should que the command and 
    // immediately return (we don't actually require the semaphore function
    // in this driver rev)

    cpqfcHBAdata->BoardLock = &BoardLock;

    PCI_TRACE( 0x90)

    // release the IO lock (and re-enable interrupts)
    spin_unlock_irqrestore( HostAdapter->host_lock, flags);

    // disable OUR HBA interrupt (keep them off as much as possible
    // during error recovery)
    disable_irq( cpqfcHBAdata->HostAdapter->irq);

    // OK, let's process the Fibre Channel Link Q and do the work
    cpqfcTS_WorkTask( HostAdapter);

    // hopefully, no more "work" to do;
    // re-enable our INTs for "normal" completion processing
    enable_irq( cpqfcHBAdata->HostAdapter->irq);
 

    cpqfcHBAdata->BoardLock = NULL; // allow commands to be queued
    CPQ_SPINUNLOCK_HBA( cpqfcHBAdata)


    // Now, complete any Cmnd we Q'd up while BoardLock was held

    CompleteBoardLockCmnd( cpqfcHBAdata);
  

  }
  // hopefully, the signal was for our module exit...
  if( cpqfcHBAdata->notify_wt != NULL )
    up( cpqfcHBAdata->notify_wt); // yep, we're outta here
}


// Freeze Tachyon routine.
// If Tachyon is already frozen, return FALSE
// If Tachyon is not frozen, call freeze function, return TRUE
//
static BOOLEAN FreezeTach( CPQFCHBA *cpqfcHBAdata)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  BOOLEAN FrozeTach = FALSE;
  // It's possible that the chip is already frozen; if so,
  // "Freezing" again will NOT! generate another Freeze
  // Completion Message.

  if( (fcChip->Registers.TYstatus.value & 0x70000) != 0x70000)
  {  // (need to freeze...)
    fcChip->FreezeTachyon( fcChip, 2);  // both ERQ and FCP assists

    // 2. Get Tach freeze confirmation
    // (synchronize SEST manipulation with Freeze Completion Message)
    // we need INTs on so semaphore can be set.	
    enable_irq( cpqfcHBAdata->HostAdapter->irq); // only way to get Semaphore
    down_interruptible( cpqfcHBAdata->TachFrozen); // wait for INT handler sem.
    // can we TIMEOUT semaphore wait?? TBD
    disable_irq( cpqfcHBAdata->HostAdapter->irq); 

    FrozeTach = TRUE;
  }  // (else, already frozen)
 
  return FrozeTach;
}  




// This is the kernel worker thread task, which processes FC
// tasks which were queued by the Interrupt handler or by
// other WorkTask functions.

#define DBG 1
//#undef DBG
void cpqfcTS_WorkTask( struct Scsi_Host *HostAdapter)
{
  CPQFCHBA *cpqfcHBAdata = (CPQFCHBA *)HostAdapter->hostdata;
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG QconsumerNdx;
  LONG ExchangeID;
  ULONG ulStatus=0;
  TachFCHDR_GCMND fchs;
  PFC_LINK_QUE fcLQ = cpqfcHBAdata->fcLQ;

  ENTER("WorkTask");

  // copy current index to work on
  QconsumerNdx = fcLQ->consumer;

  PCI_TRACEO( fcLQ->Qitem[QconsumerNdx].Type, 0x90)
  

  // NOTE: when this switch completes, we will "consume" the Que item
//  printk("Que type %Xh\n", fcLQ->Qitem[QconsumerNdx].Type);
  switch( fcLQ->Qitem[QconsumerNdx].Type )
  {
      // incoming frame - link service (ACC, UNSOL REQ, etc.)
      // or FCP-SCSI command
    case SFQ_UNKNOWN:  
      AnalyzeIncomingFrame( cpqfcHBAdata, QconsumerNdx );

      break;
  
    
    
    case EXCHANGE_QUEUED:  // an Exchange (i.e. FCP-SCSI) was previously
                           // Queued because the link was down.  The  
                           // heartbeat timer detected it and Queued it here.
                           // We attempt to start it again, and if
                           // successful we clear the EXCHANGE_Q flag.
                           // If the link doesn't come up, the Exchange
                           // will eventually time-out.

      ExchangeID = (LONG)  // x_ID copied from DPC timeout function
                   fcLQ->Qitem[QconsumerNdx].ulBuff[0];

      // It's possible that a Q'd exchange could have already
      // been started by other logic (e.g. ABTS process)
      // Don't start if already started (Q'd flag clear)

      if( Exchanges->fcExchange[ExchangeID].status & EXCHANGE_QUEUED )
      {
//        printk(" *Start Q'd x_ID %Xh: type %Xh ", 
//          ExchangeID, Exchanges->fcExchange[ExchangeID].type);
      
        ulStatus = cpqfcTSStartExchange( cpqfcHBAdata, ExchangeID);
        if( !ulStatus )
        {
//          printk("success* ");
        }	
        else
        {
#ifdef DBG
      
          if( ulStatus == EXCHANGE_QUEUED)
            printk("Queued* ");
          else
            printk("failed* ");
		
#endif
	} 
      }
      break;


    case LINKDOWN:  
      // (lots of things already done in INT handler) future here?
      break;
    
    
    case LINKACTIVE:   // Tachyon set the Lup bit in FM status
                       // NOTE: some misbehaving FC ports (like Tach2.1)
                       // can re-LIP immediately after a LIP completes.
      
      // if "initiator", need to verify LOGs with ports
//      printk("\n*LNKUP* ");

      if( fcChip->Options.initiator )
        SendLogins( cpqfcHBAdata, NULL ); // PLOGI or PDISC, based on fcPort data
                  // if SendLogins successfully completes, PortDiscDone
                  // will be set.
      
      
      // If SendLogins was successful, then we expect to get incoming
      // ACCepts or REJECTs, which are handled below.

      break;

    // LinkService and Fabric request/reply processing
    case ELS_FDISC:      // need to send Fabric Discovery (Login)
    case ELS_FLOGI:      // need to send Fabric Login
    case ELS_SCR:        // need to send State Change Registration
    case FCS_NSR:        // need to send Name Service Request
    case ELS_PLOGI:      // need to send PLOGI
    case ELS_ACC:        // send generic ACCept
    case ELS_PLOGI_ACC:  // need to send ELS ACCept frame to recv'd PLOGI
    case ELS_PRLI_ACC:   // need to send ELS ACCept frame to recv'd PRLI
    case ELS_LOGO:      // need to send ELS LOGO (logout)
    case ELS_LOGO_ACC:  // need to send ELS ACCept frame to recv'd PLOGI
    case ELS_RJT:         // ReJecT reply
    case ELS_PRLI:       // need to send ELS PRLI
 
    
//      printk(" *ELS %Xh* ", fcLQ->Qitem[QconsumerNdx].Type);
      // if PortDiscDone is not set, it means the SendLogins routine
      // failed to complete -- assume that LDn occurred, so login frames
      // are invalid
      if( !cpqfcHBAdata->PortDiscDone) // cleared by LDn
      {
        printk("Discard Q'd ELS login frame\n");
        break;  
      }

      ulStatus = cpqfcTSBuildExchange(
          cpqfcHBAdata,
          fcLQ->Qitem[QconsumerNdx].Type, // e.g. PLOGI
          (TachFCHDR_GCMND*)
            fcLQ->Qitem[QconsumerNdx].ulBuff, // incoming fchs
          NULL,         // no data (no scatter/gather list)
          &ExchangeID );// fcController->fcExchanges index, -1 if failed

      if( !ulStatus ) // Exchange setup?
      {
        ulStatus = cpqfcTSStartExchange( cpqfcHBAdata, ExchangeID );
        if( !ulStatus )
        {
          // submitted to Tach's Outbound Que (ERQ PI incremented)
          // waited for completion for ELS type (Login frames issued
          // synchronously)
        }
        else
          // check reason for Exchange not being started - we might
          // want to Queue and start later, or fail with error
        {

        }
      }

      else   // Xchange setup failed...
        printk(" cpqfcTSBuildExchange failed: %Xh\n", ulStatus );

      break;

    case SCSI_REPORT_LUNS:
      // pass the incoming frame (actually, it's a PRLI frame)
      // so we can send REPORT_LUNS, in order to determine VSA/PDU
      // FCP-SCSI Lun address mode
      IssueReportLunsCommand( cpqfcHBAdata, (TachFCHDR_GCMND*)
            fcLQ->Qitem[QconsumerNdx].ulBuff); 

      break;
      



    case BLS_ABTS:       // need to ABORT one or more exchanges
    {
      LONG x_ID = fcLQ->Qitem[QconsumerNdx].ulBuff[0];
      BOOLEAN FrozeTach = FALSE;   
     
      if ( x_ID >= TACH_SEST_LEN )  // (in)sanity check
      {
//	printk( " cpqfcTS ERROR! BOGUS x_ID %Xh", x_ID);
	break;
      }


      if( Exchanges->fcExchange[ x_ID].Cmnd == NULL ) // should be RARE
      {
//	printk(" ABTS %Xh Scsi Cmnd null! ", x_ID);
	
       break;  // nothing to abort!
      }

//#define ABTS_DBG
#ifdef ABTS_DBG
      printk("INV SEST[%X] ", x_ID); 
      if( Exchanges->fcExchange[x_ID].status & FC2_TIMEOUT)
      {
        printk("FC2TO");
      }
      if( Exchanges->fcExchange[x_ID].status & INITIATOR_ABORT)
      {
        printk("IA");
      }
      if( Exchanges->fcExchange[x_ID].status & PORTID_CHANGED)
      {
        printk("PORTID");
      }
      if( Exchanges->fcExchange[x_ID].status & DEVICE_REMOVED)
      {
        printk("DEVRM");
      }
      if( Exchanges->fcExchange[x_ID].status & LINKFAIL_TX)
      {
        printk("LKF");
      }
      if( Exchanges->fcExchange[x_ID].status & FRAME_TO)
      {
        printk("FRMTO");
      }
      if( Exchanges->fcExchange[x_ID].status & ABORTSEQ_NOTIFY)
      {
        printk("ABSQ");
      }
      if( Exchanges->fcExchange[x_ID].status & SFQ_FRAME)
      {
        printk("SFQFR");
      }

      if( Exchanges->fcExchange[ x_ID].type == 0x2000)
        printk(" WR");
      else if( Exchanges->fcExchange[ x_ID].type == 0x3000)
        printk(" RD");
      else if( Exchanges->fcExchange[ x_ID].type == 0x10)
        printk(" ABTS");
      else
        printk(" %Xh", Exchanges->fcExchange[ x_ID].type); 

      if( !(Exchanges->fcExchange[x_ID].status & INITIATOR_ABORT))
      {
	printk(" Cmd %p, ", 
          Exchanges->fcExchange[ x_ID].Cmnd);

        printk(" brd/chn/trg/lun %d/%d/%d/%d port_id %06X\n", 
          cpqfcHBAdata->HBAnum,
          Exchanges->fcExchange[ x_ID].Cmnd->channel,
          Exchanges->fcExchange[ x_ID].Cmnd->target,
          Exchanges->fcExchange[ x_ID].Cmnd->lun,
          Exchanges->fcExchange[ x_ID].fchs.d_id & 0xFFFFFF);
      }
      else  // assume that Cmnd ptr is invalid on _abort()
      {
	printk(" Cmd ptr invalid\n");
      }
     
#endif      

      
      // Steps to ABORT a SEST exchange:
      // 1. Freeze TL SCSI assists & ERQ (everything)
      // 2. Receive FROZEN inbound CM (must succeed!)
      // 3. Invalidate x_ID SEST entry 
      // 4. Resume TL SCSI assists & ERQ (everything)
      // 5. Build/start on exchange - change "type" to BLS_ABTS,
      //    timeout to X sec (RA_TOV from PLDA is actually 0)
      // 6. Set Exchange Q'd status if ABTS cannot be started,
      //    or simply complete Exchange in "Terminate" condition

  PCI_TRACEO( x_ID, 0xB4)
      
      // 1 & 2 . Freeze Tach & get confirmation of freeze
      FrozeTach = FreezeTach( cpqfcHBAdata);

      // 3. OK, Tachyon is frozen, so we can invalidate SEST exchange.
      // FC2_TIMEOUT means we are originating the abort, while
      // TARGET_ABORT means we are ACCepting an abort.
      // LINKFAIL_TX, ABORTSEQ_NOFITY, INV_ENTRY or FRAME_TO are 
      // all from Tachyon:
      // Exchange was corrupted by LDn or other FC physical failure
      // INITIATOR_ABORT means the upper layer driver/application
      // requested the abort.


	  
      // clear bit 31 (VALid), to invalidate & take control from TL
      fcChip->SEST->u[ x_ID].IWE.Hdr_Len &= 0x7FFFFFFF;


      // examine and Tach's "Linked List" for IWEs that 
      // received (nearly) simultaneous transfer ready (XRDY) 
      // repair linked list if necessary (TBD!)
      // (If we ignore the "Linked List", we will time out
      // WRITE commands where we received the FCP-SCSI XFRDY
      // frame (because Tachyon didn't processes it).  Linked List
      // management should be done as an optimization.

//       readl( fcChip->Registers.ReMapMemBase+TL_MEM_SEST_LINKED_LIST ));


      

      // 4. Resume all Tachlite functions (for other open Exchanges)
      // as quickly as possible to allow other exchanges to other ports
      // to resume.  Freezing Tachyon may cause cascading errors, because
      // any received SEST frame cannot be processed by the SEST.
      // Don't "unfreeze" unless Link is operational
      if( FrozeTach )  // did we just freeze it (above)?
        fcChip->UnFreezeTachyon( fcChip, 2);  // both ERQ and FCP assists
      

  PCI_TRACEO( x_ID, 0xB4)

      // Note there is no confirmation that the chip is "unfrozen".  Also,
      // if the Link is down when unfreeze is called, it has no effect.
      // Chip will unfreeze when the Link is back up.

      // 5. Now send out Abort commands if possible
      // Some Aborts can't be "sent" (Port_id changed or gone);
      // if the device is gone, there is no port_id to send the ABTS to.

      if( !(Exchanges->fcExchange[ x_ID].status & PORTID_CHANGED)
			  &&
          !(Exchanges->fcExchange[ x_ID].status & DEVICE_REMOVED) )
      {
        Exchanges->fcExchange[ x_ID].type = BLS_ABTS;
        fchs.s_id = Exchanges->fcExchange[ x_ID].fchs.d_id;
        ulStatus = cpqfcTSBuildExchange(
          cpqfcHBAdata,
          BLS_ABTS,
          &fchs,        // (uses only s_id)
          NULL,         // (no scatter/gather list for ABTS)
          &x_ID );// ABTS on this Exchange ID

        if( !ulStatus ) // Exchange setup build OK?
        {

            // ABTS may be needed because an Exchange was corrupted
            // by a Link disruption.  If the Link is UP, we can
	    // presume that this ABTS can start immediately; otherwise,
	    // set Que'd status so the Login functions
            // can restart it when the FC physical Link is restored
          if( ((fcChip->Registers.FMstatus.value &0xF0) &0x80)) // loop init?
          {			    
//                printk(" *set Q status x_ID %Xh on LDn* ", x_ID);
                Exchanges->fcExchange[ x_ID].status |= EXCHANGE_QUEUED;
          }

          else  // what FC device (port_id) does the Cmd belong to?
          {
            PFC_LOGGEDIN_PORT pLoggedInPort = 
              Exchanges->fcExchange[ x_ID].pLoggedInPort;
            
            // if Port is logged in, we might start the abort.
	
            if( (pLoggedInPort != NULL) 
			      &&
                (pLoggedInPort->prli == TRUE) ) 
            {
              // it's possible that an Exchange has already been Queued
              // to start after Login completes.  Check and don't
	      // start it (again) here if Q'd status set
//	    printk(" ABTS xchg %Xh ", x_ID);            
 	      if( Exchanges->fcExchange[x_ID].status & EXCHANGE_QUEUED)
	      {
//		    printk("already Q'd ");
	      }
	      else
	      {
//	            printk("starting ");
		
                fcChip->fcStats.FC2aborted++; 
                ulStatus = cpqfcTSStartExchange( cpqfcHBAdata, x_ID );
                if( !ulStatus )
                {
                    // OK
                    // submitted to Tach's Outbound Que (ERQ PI incremented)
                }
                else
                {
/*                   printk("ABTS exchange start failed -status %Xh, x_ID %Xh ",
                        ulStatus, x_ID);
*/
                } 
	      }
	    }
	    else
	    {
/*         	  printk(" ABTS NOT starting xchg %Xh, %p ",
			       x_ID, pLoggedInPort);
	          if( pLoggedInPort )
	            printk("prli %d ", pLoggedInPort->prli);
*/
	    }		
 	  }
        }
        else  // what the #@!
        {  // how do we fail to build an Exchange for ABTS??
              printk("ABTS exchange build failed -status %Xh, x_ID %Xh\n",
                ulStatus, x_ID);
        }
      }
      else   // abort without ABTS -- just complete exchange/Cmnd to Linux
      {
//            printk(" *Terminating x_ID %Xh on %Xh* ", 
//		    x_ID, Exchanges->fcExchange[x_ID].status);
        cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, x_ID);

      }
    } // end of ABTS case
      break;



    case BLS_ABTS_ACC:   // need to ACCept one ABTS
                         // (NOTE! this code not updated for Linux yet..)
      

      printk(" *ABTS_ACC* ");
      // 1. Freeze TL

      fcChip->FreezeTachyon( fcChip, 2);  // both ERQ and FCP assists

      memcpy(  // copy the incoming ABTS frame
        &fchs,
        fcLQ->Qitem[QconsumerNdx].ulBuff, // incoming fchs
        sizeof( fchs));

      // 3. OK, Tachyon is frozen so we can invalidate SEST entry 
      // (if necessary)
      // Status FC2_TIMEOUT means we are originating the abort, while
      // TARGET_ABORT means we are ACCepting an abort
      
      ExchangeID = fchs.ox_rx_id & 0x7FFF; // RX_ID for exchange
//      printk("ABTS ACC for Target ExchangeID %Xh\n", ExchangeID);


      // sanity check on received ExchangeID
      if( Exchanges->fcExchange[ ExchangeID].status == TARGET_ABORT )
      {
          // clear bit 31 (VALid), to invalidate & take control from TL
//          printk("Invalidating SEST exchange %Xh\n", ExchangeID);
          fcChip->SEST->u[ ExchangeID].IWE.Hdr_Len &= 0x7FFFFFFF;
      }


      // 4. Resume all Tachlite functions (for other open Exchanges)
      // as quickly as possible to allow other exchanges to other ports
      // to resume.  Freezing Tachyon for too long may royally screw
      // up everything!
      fcChip->UnFreezeTachyon( fcChip, 2);  // both ERQ and FCP assists
      
      // Note there is no confirmation that the chip is "unfrozen".  Also,
      // if the Link is down when unfreeze is called, it has no effect.
      // Chip will unfreeze when the Link is back up.

      // 5. Now send out Abort ACC reply for this exchange
      Exchanges->fcExchange[ ExchangeID].type = BLS_ABTS_ACC;
      
      fchs.s_id = Exchanges->fcExchange[ ExchangeID].fchs.d_id;
      ulStatus = cpqfcTSBuildExchange(
            cpqfcHBAdata,
            BLS_ABTS_ACC,
            &fchs,
            NULL,         // no data (no scatter/gather list)
            &ExchangeID );// fcController->fcExchanges index, -1 if failed

      if( !ulStatus ) // Exchange setup?
      {
        ulStatus = cpqfcTSStartExchange( cpqfcHBAdata, ExchangeID );
        if( !ulStatus )
        {
          // submitted to Tach's Outbound Que (ERQ PI incremented)
          // waited for completion for ELS type (Login frames issued
          // synchronously)
        }
        else
          // check reason for Exchange not being started - we might
          // want to Queue and start later, or fail with error
        {

        } 
      }
      break;


    case BLS_ABTS_RJT:   // need to ReJecT one ABTS; reject implies the
                         // exchange doesn't exist in the TARGET context.
                         // ExchangeID has to come from LinkService space.

      printk(" *ABTS_RJT* ");
      ulStatus = cpqfcTSBuildExchange(
            cpqfcHBAdata,
            BLS_ABTS_RJT,
            (TachFCHDR_GCMND*)
              fcLQ->Qitem[QconsumerNdx].ulBuff, // incoming fchs
            NULL,         // no data (no scatter/gather list)
            &ExchangeID );// fcController->fcExchanges index, -1 if failed

      if( !ulStatus ) // Exchange setup OK?
      {
        ulStatus = cpqfcTSStartExchange( cpqfcHBAdata, ExchangeID );
        // If it fails, we aren't required to retry.
      }
      if( ulStatus )
      {
        printk("Failed to send BLS_RJT for ABTS, X_ID %Xh\n", ExchangeID);
      }
      else
      {
        printk("Sent BLS_RJT for ABTS, X_ID %Xh\n", ExchangeID);
      
      }

      break;



    default:
      break;
  }                   // end switch
//doNothing:
    // done with this item - now set the NEXT index

  if( QconsumerNdx+1 >= FC_LINKQ_DEPTH ) // rollover test
  {
    fcLQ->consumer = 0;
  }
  else
  { 
    fcLQ->consumer++;
  }

  PCI_TRACEO( fcLQ->Qitem[QconsumerNdx].Type, 0x94)

  LEAVE("WorkTask");
  return;
}




// When Tachyon reports link down, bad al_pa, or Link Service (e.g. Login)
// commands come in, post to the LinkQ so that action can be taken outside the
// interrupt handler.  
// This circular Q works like Tachyon's que - the producer points to the next
// (unused) entry.  Called by Interrupt handler, WorkerThread, Timer
// sputlinkq
void cpqfcTSPutLinkQue( CPQFCHBA *cpqfcHBAdata,
  int Type, 
  void *QueContent)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
//  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  PFC_LINK_QUE fcLQ = cpqfcHBAdata->fcLQ;
  ULONG ndx;
  
  ENTER("cpqfcTSPutLinkQ");

  ndx = fcLQ->producer;
  
  ndx += 1;  // test for Que full


  
  if( ndx >= FC_LINKQ_DEPTH ) // rollover test
    ndx = 0;

  if( ndx == fcLQ->consumer )   // QUE full test
  {
                       // QUE was full! lost LK command (fatal to logic)
    fcChip->fcStats.lnkQueFull++;

    printk("*LinkQ Full!*");
    TriggerHBA( fcChip->Registers.ReMapMemBase, 1);
/*
    {
      int i;
      printk("LinkQ PI %d, CI %d\n", fcLQ->producer,
        fcLQ->consumer);
		      
      for( i=0; i< FC_LINKQ_DEPTH; )
      {
	printk(" [%d]%Xh ", i, fcLQ->Qitem[i].Type);
	if( (++i %8) == 0) printk("\n");
      }
  
    }
*/    
    printk( "cpqfcTS: WARNING!! PutLinkQue - FULL!\n"); // we're hung
  }
  else                        // QUE next element
  {
    // Prevent certain multiple (back-to-back) requests.
    // This is important in that we don't want to issue multiple
    // ABTS for the same Exchange, or do multiple FM inits, etc.
    // We can never be sure of the timing of events reported to
    // us by Tach's IMQ, which can depend on system/bus speeds,
    // FC physical link circumstances, etc.
     
    if( (fcLQ->producer != fcLQ->consumer)
	    && 
        (Type == FMINIT)  )
    {
      LONG lastNdx;  // compute previous producer index
      if( fcLQ->producer)
        lastNdx = fcLQ->producer- 1;
      else
	lastNdx = FC_LINKQ_DEPTH-1;


      if( fcLQ->Qitem[lastNdx].Type == FMINIT)
      {
//        printk(" *skip FMINIT Q post* ");
//        goto DoneWithPutQ;
      }

    }

    // OK, add the Q'd item...
    
    fcLQ->Qitem[fcLQ->producer].Type = Type;
   
    memcpy(
        fcLQ->Qitem[fcLQ->producer].ulBuff,
        QueContent, 
        sizeof(fcLQ->Qitem[fcLQ->producer].ulBuff));

    fcLQ->producer = ndx;  // increment Que producer

    // set semaphore to wake up Kernel (worker) thread
    // 
    up( cpqfcHBAdata->fcQueReady );
  }

//DoneWithPutQ:

  LEAVE("cpqfcTSPutLinkQ");
}




// reset device ext FC link Q
void cpqfcTSLinkQReset( CPQFCHBA *cpqfcHBAdata)
   
{
  PFC_LINK_QUE fcLQ = cpqfcHBAdata->fcLQ;
  fcLQ->producer = 0;
  fcLQ->consumer = 0;

}





// When Tachyon gets an unassisted FCP-SCSI frame, post here so
// an arbitrary context thread (e.g. IOCTL loopback test function)
// can process it.

// (NOTE: Not revised for Linux)
// This Q works like Tachyon's que - the producer points to the next
// (unused) entry.
void cpqfcTSPutScsiQue( CPQFCHBA *cpqfcHBAdata,
  int Type, 
  void *QueContent)
{
//  CPQFCHBA *cpqfcHBAdata = (CPQFCHBA *)HostAdapter->hostdata;
//  PTACHYON fcChip = &cpqfcHBAdata->fcChip;

//  ULONG ndx;

//  ULONG *pExchangeID;
//  LONG ExchangeID;

/*
  KeAcquireSpinLockAtDpcLevel( &pDevExt->fcScsiQueLock);
  ndx = pDevExt->fcScsiQue.producer + 1;  // test for Que full

  if( ndx >= FC_SCSIQ_DEPTH ) // rollover test
    ndx = 0;

  if( ndx == pDevExt->fcScsiQue.consumer )   // QUE full test
  {
                       // QUE was full! lost LK command (fatal to logic)
    fcChip->fcStats.ScsiQueFull++;
#ifdef DBG
    printk( "fcPutScsiQue - FULL!\n");
#endif

  }
  else                        // QUE next element
  {
    pDevExt->fcScsiQue.Qitem[pDevExt->fcScsiQue.producer].Type = Type;
    
    if( Type == FCP_RSP )
    {
      // this TL inbound message type means that a TL SEST exchange has
      // copied an FCP response frame into a buffer pointed to by the SEST
      // entry.  That buffer is allocated in the SEST structure at ->RspHDR.
      // Copy the RspHDR for use by the Que handler.
      pExchangeID = (ULONG *)QueContent;
      
      memcpy(
	      pDevExt->fcScsiQue.Qitem[pDevExt->fcScsiQue.producer].ulBuff,
        &fcChip->SEST->RspHDR[ *pExchangeID ],
	      sizeof(pDevExt->fcScsiQue.Qitem[0].ulBuff)); // (any element for size)
      
    }
    else
    {
      memcpy(
	      pDevExt->fcScsiQue.Qitem[pDevExt->fcScsiQue.producer].ulBuff,
        QueContent, 
	      sizeof(pDevExt->fcScsiQue.Qitem[pDevExt->fcScsiQue.producer].ulBuff));
    }
      
    pDevExt->fcScsiQue.producer = ndx;  // increment Que


    KeSetEvent( &pDevExt->TYIBscsi,  // signal any waiting thread
       0,                    // no priority boost
		   FALSE );              // no waiting later for this event
  }
  KeReleaseSpinLockFromDpcLevel( &pDevExt->fcScsiQueLock);
*/
}







static void ProcessELS_Request( CPQFCHBA*,TachFCHDR_GCMND*);

static void ProcessELS_Reply( CPQFCHBA*,TachFCHDR_GCMND*);

static void ProcessFCS_Reply( CPQFCHBA*,TachFCHDR_GCMND*);

void cpqfcTSImplicitLogout( CPQFCHBA* cpqfcHBAdata,
		PFC_LOGGEDIN_PORT pFcPort)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;

  if( pFcPort->port_id != 0xFFFC01 ) // don't care about Fabric
  {
    fcChip->fcStats.logouts++;
    printk("cpqfcTS: Implicit logout of WWN %08X%08X, port_id %06X\n", 
        (ULONG)pFcPort->u.liWWN,
        (ULONG)(pFcPort->u.liWWN >>32),
	pFcPort->port_id);

  // Terminate I/O with this (Linux) Scsi target
    cpqfcTSTerminateExchange( cpqfcHBAdata, 
                            &pFcPort->ScsiNexus,
	                    DEVICE_REMOVED);
  }
			
  // Do an "implicit logout" - we can't really Logout the device
  // (i.e. with LOGOut Request) because of port_id confusion
  // (i.e. the Other port has no port_id).
  // A new login for that WWN will have to re-write port_id (0 invalid)
  pFcPort->port_id = 0;  // invalid!
  pFcPort->pdisc = FALSE;
  pFcPort->prli = FALSE;
  pFcPort->plogi = FALSE;
  pFcPort->flogi = FALSE;
  pFcPort->LOGO_timer = 0;
  pFcPort->device_blocked = TRUE; // block Scsi Requests
  pFcPort->ScsiNexus.VolumeSetAddressing=0;	
}

  
// On FC-AL, there is a chance that a previously known device can
// be quietly removed (e.g. with non-managed hub), 
// while a NEW device (with different WWN) took the same alpa or
// even 24-bit port_id.  This chance is unlikely but we must always
// check for it.
static void TestDuplicatePortId( CPQFCHBA* cpqfcHBAdata,
		PFC_LOGGEDIN_PORT pLoggedInPort)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  // set "other port" at beginning of fcPorts list
  PFC_LOGGEDIN_PORT pOtherPortWithPortId = fcChip->fcPorts.pNextPort;
  while( pOtherPortWithPortId ) 
  {
    if( (pOtherPortWithPortId->port_id == 
         pLoggedInPort->port_id) 
		    &&
         (pOtherPortWithPortId != pLoggedInPort) )
    {
      // trouble!  (Implicitly) Log the other guy out
      printk(" *port_id %Xh is duplicated!* ", 
        pOtherPortWithPortId->port_id);
      cpqfcTSImplicitLogout( cpqfcHBAdata, pOtherPortWithPortId); 
   }
    pOtherPortWithPortId = pOtherPortWithPortId->pNextPort;
  }
}






// Dynamic Memory Allocation for newly discovered FC Ports.
// For simplicity, maintain fcPorts structs for ALL
// for discovered devices, including those we never do I/O with
// (e.g. Fabric addresses)

static PFC_LOGGEDIN_PORT CreateFcPort( 
	  CPQFCHBA* cpqfcHBAdata, 
	  PFC_LOGGEDIN_PORT pLastLoggedInPort, 
	  TachFCHDR_GCMND* fchs,
	  LOGIN_PAYLOAD* plogi)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  PFC_LOGGEDIN_PORT pNextLoggedInPort = NULL;
  int i;


  printk("cpqfcTS: New FC port %06Xh WWN: ", fchs->s_id);
  for( i=3; i>=0; i--)   // copy the LOGIN port's WWN
    printk("%02X", plogi->port_name[i]);
  for( i=7; i>3; i--)   // copy the LOGIN port's WWN
    printk("%02X", plogi->port_name[i]);


  // allocate mem for new port
  // (these are small and rare allocations...)
  pNextLoggedInPort = kmalloc( sizeof( FC_LOGGEDIN_PORT), GFP_ATOMIC );

    
  // allocation succeeded?  Fill out NEW PORT
  if( pNextLoggedInPort )
  {    
                              // clear out any garbage (sometimes exists)
    memset( pNextLoggedInPort, 0, sizeof( FC_LOGGEDIN_PORT));


    // If we login to a Fabric, we don't want to treat it
    // as a SCSI device...
    if( (fchs->s_id & 0xFFF000) != 0xFFF000)
    {
      int i;
      
      // create a unique "virtual" SCSI Nexus (for now, just a
      // new target ID) -- we will update channel/target on REPORT_LUNS
      // special case for very first SCSI target...
      if( cpqfcHBAdata->HostAdapter->max_id == 0)
      {
        pNextLoggedInPort->ScsiNexus.target = 0;
        fcChip->fcPorts.ScsiNexus.target = -1; // don't use "stub"
      }
      else
      {
        pNextLoggedInPort->ScsiNexus.target =
          cpqfcHBAdata->HostAdapter->max_id;
      }

      // initialize the lun[] Nexus struct for lun masking      
      for( i=0; i< CPQFCTS_MAX_LUN; i++)
        pNextLoggedInPort->ScsiNexus.lun[i] = 0xFF; // init to NOT USED
      
      pNextLoggedInPort->ScsiNexus.channel = 0; // cpqfcTS has 1 FC port
      
      printk(" SCSI Chan/Trgt %d/%d", 
          pNextLoggedInPort->ScsiNexus.channel,
          pNextLoggedInPort->ScsiNexus.target);
 
      // tell Scsi layers about the new target...
      cpqfcHBAdata->HostAdapter->max_id++; 
//    printk("HostAdapter->max_id = %d\n",
//      cpqfcHBAdata->HostAdapter->max_id);		    
    }                          
    else
    {
      // device is NOT SCSI (in case of Fabric)
      pNextLoggedInPort->ScsiNexus.target = -1;  // invalid
    }

	  // create forward link to new port
    pLastLoggedInPort->pNextPort = pNextLoggedInPort;
    printk("\n");

  }     
  return pNextLoggedInPort;  // NULL on allocation failure
}   // end NEW PORT (WWN) logic



// For certain cases, we want to terminate exchanges without
// sending ABTS to the device.  Examples include when an FC
// device changed it's port_id after Loop re-init, or when
// the device sent us a logout.  In the case of changed port_id,
// we want to complete the command and return SOFT_ERROR to
// force a re-try.  In the case of LOGOut, we might return
// BAD_TARGET if the device is really gone.
// Since we must ensure that Tachyon is not operating on the
// exchange, we have to freeze the chip
// sterminateex
void cpqfcTSTerminateExchange( 
  CPQFCHBA* cpqfcHBAdata, SCSI_NEXUS *ScsiNexus, int TerminateStatus)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG x_ID;

  if( ScsiNexus )
  {
//    printk("TerminateExchange: ScsiNexus chan/target %d/%d\n",
//		    ScsiNexus->channel, ScsiNexus->target);

  } 
  
  for( x_ID = 0; x_ID < TACH_SEST_LEN; x_ID++)
  {
    if( Exchanges->fcExchange[x_ID].type )  // in use?
    {
      if( ScsiNexus == NULL ) // our HBA changed - term. all
      {
	Exchanges->fcExchange[x_ID].status = TerminateStatus;
        cpqfcTSPutLinkQue( cpqfcHBAdata, BLS_ABTS, &x_ID ); 
      }
      else
      {
	// If a device, according to WWN, has been removed, it's
	// port_id may be used by another working device, so we
	// have to terminate by SCSI target, NOT port_id.
        if( Exchanges->fcExchange[x_ID].Cmnd) // Cmnd in progress?
	{	                 
	  if( (Exchanges->fcExchange[x_ID].Cmnd->device->id == ScsiNexus->target)
			&&
            (Exchanges->fcExchange[x_ID].Cmnd->device->channel == ScsiNexus->channel)) 
          {
            Exchanges->fcExchange[x_ID].status = TerminateStatus;
            cpqfcTSPutLinkQue( cpqfcHBAdata, BLS_ABTS, &x_ID ); // timed-out
          }
	}

	// (in case we ever need it...)
	// all SEST structures have a remote node ID at SEST DWORD 2
        //          if( (fcChip->SEST->u[ x_ID ].TWE.Remote_Node_ID >> 8)
        //                ==  port_id)
      } 
    }
  }
}


static void ProcessELS_Request( 
              CPQFCHBA* cpqfcHBAdata, TachFCHDR_GCMND* fchs)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
//  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
//  ULONG ox_id = (fchs->ox_rx_id >>16);
  PFC_LOGGEDIN_PORT pLoggedInPort=NULL, pLastLoggedInPort;
  BOOLEAN NeedReject = FALSE;
  ULONG ls_reject_code = 0; // default don'n know??


  // Check the incoming frame for a supported ELS type
  switch( fchs->pl[0] & 0xFFFF)
  {
  case 0x0050: //  PDISC?

    // Payload for PLOGI and PDISC is identical (request & reply)
    if( !verify_PLOGI( fcChip, fchs, &ls_reject_code) ) // valid payload?
    {
      LOGIN_PAYLOAD logi;       // FC-PH Port Login
      
      // PDISC payload OK. If critical login fields
      // (e.g. WWN) matches last login for this port_id,
      // we may resume any prior exchanges
      // with the other port

      
      BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&logi, sizeof(logi));
   
      pLoggedInPort = fcFindLoggedInPort( 
             fcChip, 
	     NULL,     // don't search Scsi Nexus
	     0,        // don't search linked list for port_id
             &logi.port_name[0],     // search linked list for WWN
             &pLastLoggedInPort);  // must return non-NULL; when a port_id
                                   // is not found, this pointer marks the
                                   // end of the singly linked list
    
      if( pLoggedInPort != NULL)   // WWN found (prior login OK)
      { 
           
 	if( (fchs->s_id & 0xFFFFFF) == pLoggedInPort->port_id)
	{
          // Yes.  We were expecting PDISC?
          if( pLoggedInPort->pdisc )
	  {
	    // Yes; set fields accordingly.     (PDISC, not Originator)
            SetLoginFields( pLoggedInPort, fchs, TRUE, FALSE);
       
            // send 'ACC' reply 
            cpqfcTSPutLinkQue( cpqfcHBAdata, 
                          ELS_PLOGI_ACC, // (PDISC same as PLOGI ACC)
                          fchs );

	    // OK to resume I/O...
	  }
	  else
 	  {
	    printk("Not expecting PDISC (pdisc=FALSE)\n");
	    NeedReject = TRUE;
	    // set reject reason code 
            ls_reject_code = 
              LS_RJT_REASON( PROTOCOL_ERROR, INITIATOR_CTL_ERROR);
	  }
	}
	else
	{
	  if( pLoggedInPort->port_id != 0)
	  {
  	    printk("PDISC PortID change: old %Xh, new %Xh\n",
              pLoggedInPort->port_id, fchs->s_id &0xFFFFFF);
	  }
          NeedReject = TRUE;
          // set reject reason code 
          ls_reject_code = 
	    LS_RJT_REASON( PROTOCOL_ERROR, INITIATOR_CTL_ERROR);
		  
	}
      }
      else
      {
	printk("PDISC Request from unknown WWN\n");
        NeedReject = TRUE;
          
	// set reject reason code 
        ls_reject_code = 
          LS_RJT_REASON( LOGICAL_ERROR, INVALID_PORT_NAME);
      }

    }
    else // Payload unacceptable
    {
      printk("payload unacceptable\n");
      NeedReject = TRUE;  // reject code already set
      
    }

    if( NeedReject)
    {
      ULONG port_id;
      // The PDISC failed.  Set login struct flags accordingly,
      // terminate any I/O to this port, and Q a PLOGI
      if( pLoggedInPort )
      {
        pLoggedInPort->pdisc = FALSE;
        pLoggedInPort->prli = FALSE;
        pLoggedInPort->plogi = FALSE;
	
        cpqfcTSTerminateExchange( cpqfcHBAdata, 
          &pLoggedInPort->ScsiNexus, PORTID_CHANGED);
	port_id = pLoggedInPort->port_id;
      }
      else
      {
	port_id = fchs->s_id &0xFFFFFF;
      }
      fchs->reserved = ls_reject_code; // borrow this (unused) field
      cpqfcTSPutLinkQue( cpqfcHBAdata, ELS_RJT, fchs );
    }
   
    break;



  case 0x0003: //  PLOGI?

    // Payload for PLOGI and PDISC is identical (request & reply)
    if( !verify_PLOGI( fcChip, fchs, &ls_reject_code) ) // valid payload?
    {
      LOGIN_PAYLOAD logi;       // FC-PH Port Login
      BOOLEAN NeedReject = FALSE;
      
      // PDISC payload OK. If critical login fields
      // (e.g. WWN) matches last login for this port_id,
      // we may resume any prior exchanges
      // with the other port

      
      BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&logi, sizeof(logi));
   
      pLoggedInPort = fcFindLoggedInPort( 
             fcChip, 
	     NULL,       // don't search Scsi Nexus
	     0,        // don't search linked list for port_id
             &logi.port_name[0],     // search linked list for WWN
             &pLastLoggedInPort);  // must return non-NULL; when a port_id
                                   // is not found, this pointer marks the
                                   // end of the singly linked list
    
      if( pLoggedInPort == NULL)   // WWN not found -New Port
      { 
      	pLoggedInPort = CreateFcPort( 
			  cpqfcHBAdata, 
			  pLastLoggedInPort, 
			  fchs,
			  &logi);
        if( pLoggedInPort == NULL )
        {
          printk(" cpqfcTS: New port allocation failed - lost FC device!\n");
          // Now Q a LOGOut Request, since we won't be talking to that device
	
          NeedReject = TRUE;  
	  
          // set reject reason code 
          ls_reject_code = 
            LS_RJT_REASON( LOGICAL_ERROR, NO_LOGIN_RESOURCES);
	    
	}
      }
      if( !NeedReject )
      {
      
        // OK - we have valid fcPort ptr; set fields accordingly.   
	//                         (not PDISC, not Originator)
        SetLoginFields( pLoggedInPort, fchs, FALSE, FALSE); 

        // send 'ACC' reply 
        cpqfcTSPutLinkQue( cpqfcHBAdata, 
                      ELS_PLOGI_ACC, // (PDISC same as PLOGI ACC)
                      fchs );
      }
    }
    else // Payload unacceptable
    {
      printk("payload unacceptable\n");
      NeedReject = TRUE;  // reject code already set
    }

    if( NeedReject)
    {
      // The PDISC failed.  Set login struct flags accordingly,
      // terminate any I/O to this port, and Q a PLOGI
      pLoggedInPort->pdisc = FALSE;
      pLoggedInPort->prli = FALSE;
      pLoggedInPort->plogi = FALSE;
	
      fchs->reserved = ls_reject_code; // borrow this (unused) field

      // send 'RJT' reply 
      cpqfcTSPutLinkQue( cpqfcHBAdata, ELS_RJT, fchs );
    }
   
    // terminate any exchanges with this device...
    if( pLoggedInPort )
    {
      cpqfcTSTerminateExchange( cpqfcHBAdata, 
        &pLoggedInPort->ScsiNexus, PORTID_CHANGED);
    }
    break;



  case 0x1020:  // PRLI?
  {
    BOOLEAN NeedReject = TRUE;
    pLoggedInPort = fcFindLoggedInPort( 
           fcChip, 
           NULL,       // don't search Scsi Nexus
	   (fchs->s_id & 0xFFFFFF),  // search linked list for port_id
           NULL,     // DON'T search linked list for WWN
           NULL);    // don't care
      
    if( pLoggedInPort == NULL ) 
    {
      // huh?
      printk(" Unexpected PRLI Request -not logged in!\n");

      // set reject reason code 
      ls_reject_code = LS_RJT_REASON( PROTOCOL_ERROR, INITIATOR_CTL_ERROR);
      
      // Q a LOGOut here?
    }
    else
    {
      // verify the PRLI ACC payload
      if( !verify_PRLI( fchs, &ls_reject_code) )
      {
        // PRLI Reply is acceptable; were we expecting it?
        if( pLoggedInPort->plogi ) 
        { 
  	  // yes, we expected the PRLI ACC  (not PDISC; not Originator)
          SetLoginFields( pLoggedInPort, fchs, FALSE, FALSE);

          // Q an ACCept Reply
	  cpqfcTSPutLinkQue( cpqfcHBAdata,
                        ELS_PRLI_ACC, 
                        fchs );   
	  
	  NeedReject = FALSE;
	}
        else
        {
          // huh?
          printk(" (unexpected) PRLI REQEST with plogi FALSE\n");

          // set reject reason code 
          ls_reject_code = LS_RJT_REASON( PROTOCOL_ERROR, INITIATOR_CTL_ERROR);
    
    	  // Q a LOGOut here?
	  
        }
      }
      else
      {
        printk(" PRLI REQUEST payload failed verify\n");
        // (reject code set by "verify")

        // Q a LOGOut here?
      }
    }

    if( NeedReject )
    {
      // Q a ReJecT Reply with reason code
      fchs->reserved = ls_reject_code;
      cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_RJT, // Q Type
                    fchs );  
    }
  }
    break;
 

    

  case  0x0005:  // LOGOut?
  {
  // was this LOGOUT because we sent a ELS_PDISC to an FC device
  // with changed (or new) port_id, or does the port refuse 
  // to communicate to us?
  // We maintain a logout counter - if we get 3 consecutive LOGOuts,
  // give up!
    LOGOUT_PAYLOAD logo;
    BOOLEAN GiveUpOnDevice = FALSE;
    ULONG ls_reject_code = 0;
    
    BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&logo, sizeof(logo));

    pLoggedInPort = fcFindLoggedInPort( 
           fcChip, 
           NULL,     // don't search Scsi Nexus
	   0,        // don't search linked list for port_id
           &logo.port_name[0],     // search linked list for WWN
           NULL);    // don't care about end of list
    
    if( pLoggedInPort ) // found the device?
    {
      // Q an ACC reply 
      cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_LOGO_ACC, // Q Type
                    fchs );       // device to respond to

      // set login struct fields (LOGO_counter increment)
      SetLoginFields( pLoggedInPort, fchs, FALSE, FALSE);
      
      // are we an Initiator?
      if( fcChip->Options.initiator)  
      {
        // we're an Initiator, so check if we should 
	// try (another?) login

	// Fabrics routinely log out from us after
	// getting device info - don't try to log them
	// back in.
	if( (fchs->s_id & 0xFFF000) == 0xFFF000 )
	{
	  ; // do nothing
	}
	else if( pLoggedInPort->LOGO_counter <= 3)
	{
	  // try (another) login (PLOGI request)
	  
          cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_PLOGI, // Q Type
                    fchs );  
	
	  // Terminate I/O with "retry" potential
	  cpqfcTSTerminateExchange( cpqfcHBAdata, 
			            &pLoggedInPort->ScsiNexus,
				    PORTID_CHANGED);
	}
	else
	{
	  printk(" Got 3 LOGOuts - terminating comm. with port_id %Xh\n",
			  fchs->s_id &&0xFFFFFF);
	  GiveUpOnDevice = TRUE;
	}
      }
      else
      {
	GiveUpOnDevice = TRUE;
      }


      if( GiveUpOnDevice == TRUE )
      {
        cpqfcTSTerminateExchange( cpqfcHBAdata, 
	                          &pLoggedInPort->ScsiNexus,
		                  DEVICE_REMOVED);
      }
    }  
    else  // we don't know this WWN!
    {
      // Q a ReJecT Reply with reason code
      fchs->reserved = ls_reject_code;
      cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_RJT, // Q Type
                    fchs );  
    }
  }
    break;




  // FABRIC only case
  case 0x0461:  // ELS RSCN (Registered State Change Notification)?
  {
    int Ports;
    int i;
    __u32 Buff;
    // Typically, one or more devices have been added to or dropped
    // from the Fabric.
    // The format of this frame is defined in FC-FLA (Rev 2.7, Aug 1997)
    // The first 32-bit word has a 2-byte Payload Length, which
    // includes the 4 bytes of the first word.  Consequently,
    // this PL len must never be less than 4, must be a multiple of 4,
    // and has a specified max value 256.
    // (Endianess!)
    Ports = ((fchs->pl[0] >>24) - 4) / 4;
    Ports = Ports > 63 ? 63 : Ports;
    
    printk(" RSCN ports: %d\n", Ports);
    if( Ports <= 0 )  // huh?
    {
      // ReJecT the command
      fchs->reserved = LS_RJT_REASON( UNABLE_TO_PERFORM, 0);
    
      cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_RJT, // Q Type
                    fchs ); 
      
      break;
    }
    else  // Accept the command
    {
       cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_ACC, // Q Type
                    fchs ); 
    }
    
      // Check the "address format" to determine action.
      // We have 3 cases:
      // 0 = Port Address; 24-bit address of affected device
      // 1 = Area Address; MS 16 bits valid
      // 2 = Domain Address; MS 8 bits valid
    for( i=0; i<Ports; i++)
    { 
      BigEndianSwap( (UCHAR*)&fchs->pl[i+1],(UCHAR*)&Buff, 4);
      switch( Buff & 0xFF000000)
      {

      case 0:  // Port Address?
	
      case 0x01000000: // Area Domain?
      case 0x02000000: // Domain Address
        // For example, "port_id" 0x201300 
	// OK, let's try a Name Service Request (Query)
      fchs->s_id = 0xFFFFFC;  // Name Server Address
      cpqfcTSPutLinkQue( cpqfcHBAdata, FCS_NSR, fchs);

      break;
	
	
      default:  // huh? new value on version change?
      break;
      }
    }
  }    
  break;    



    
  default:  // don't support this request (yet)
    // set reject reason code 
    fchs->reserved = LS_RJT_REASON( UNABLE_TO_PERFORM, 
		                    REQUEST_NOT_SUPPORTED);
    
    cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_RJT, // Q Type
                    fchs );     
    break;  
  }
}


static void ProcessELS_Reply( 
		CPQFCHBA* cpqfcHBAdata, TachFCHDR_GCMND* fchs)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG ox_id = (fchs->ox_rx_id >>16);
  ULONG ls_reject_code;
  PFC_LOGGEDIN_PORT pLoggedInPort, pLastLoggedInPort;
  
  // If this is a valid reply, then we MUST have sent a request.
  // Verify that we can find a valid request OX_ID corresponding to
  // this reply

  
  if( Exchanges->fcExchange[(fchs->ox_rx_id >>16)].type == 0)
  {
    printk(" *Discarding ACC/RJT frame, xID %04X/%04X* ", 
		    ox_id, fchs->ox_rx_id & 0xffff);
    goto Quit;  // exit this routine
  }


  // Is the reply a RJT (reject)?
  if( (fchs->pl[0] & 0xFFFFL) == 0x01) // Reject reply?
  {
//  ******  REJECT REPLY  ********
    switch( Exchanges->fcExchange[ox_id].type )
    {
	  
    case ELS_FDISC:  // we sent out Fabric Discovery
    case ELS_FLOGI:  // we sent out FLOGI

      printk("RJT received on Fabric Login from %Xh, reason %Xh\n", 
        fchs->s_id, fchs->pl[1]);    

    break;

    default:
    break;
    }
      
    goto Done;
  }

  // OK, we have an ACCept...
  // What's the ACC type? (according to what we sent)
  switch( Exchanges->fcExchange[ox_id].type )
  {
	  
  case ELS_PLOGI:  // we sent out PLOGI
    if( !verify_PLOGI( fcChip, fchs, &ls_reject_code) )
    {
      LOGIN_PAYLOAD logi;       // FC-PH Port Login
      
      // login ACC payload acceptable; search for WWN in our list
      // of fcPorts
      
      BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&logi, sizeof(logi));
   
      pLoggedInPort = fcFindLoggedInPort( 
             fcChip, 
	     NULL,     // don't search Scsi Nexus
	     0,        // don't search linked list for port_id
             &logi.port_name[0],     // search linked list for WWN
             &pLastLoggedInPort);  // must return non-NULL; when a port_id
                                   // is not found, this pointer marks the
                                   // end of the singly linked list
    
      if( pLoggedInPort == NULL)         // WWN not found - new port
      {

	pLoggedInPort = CreateFcPort( 
			  cpqfcHBAdata, 
			  pLastLoggedInPort, 
			  fchs,
			  &logi);

        if( pLoggedInPort == NULL )
        {
          printk(" cpqfcTS: New port allocation failed - lost FC device!\n");
          // Now Q a LOGOut Request, since we won't be talking to that device
	
          goto Done;  // exit with error! dropped login frame
	}
      }
      else      // WWN was already known.  Ensure that any open
	        // exchanges for this WWN are terminated.
      	// NOTE: It's possible that a device can change its 
	// 24-bit port_id after a Link init or Fabric change 
	// (e.g. LIP or Fabric RSCN).  In that case, the old
	// 24-bit port_id may be duplicated, or no longer exist.
      {

        cpqfcTSTerminateExchange( cpqfcHBAdata, 
          &pLoggedInPort->ScsiNexus, PORTID_CHANGED);
      }

      // We have an fcPort struct - set fields accordingly
                                    // not PDISC, originator 
      SetLoginFields( pLoggedInPort, fchs, FALSE, TRUE);
			
      // We just set a "port_id"; is it duplicated?
      TestDuplicatePortId( cpqfcHBAdata, pLoggedInPort);

      // For Fabric operation, we issued PLOGI to 0xFFFFFC
      // so we can send SCR (State Change Registration) 
      // Check for this special case...
      if( fchs->s_id == 0xFFFFFC ) 
      {
        // PLOGI ACC was a Fabric response... issue SCR
	fchs->s_id = 0xFFFFFD;  // address for SCR
        cpqfcTSPutLinkQue( cpqfcHBAdata, ELS_SCR, fchs);
      }

      else
      {
      // Now we need a PRLI to enable FCP-SCSI operation
      // set flags and Q up a ELS_PRLI
        cpqfcTSPutLinkQue( cpqfcHBAdata, ELS_PRLI, fchs);
      }
    }
    else
    {
      // login payload unacceptable - reason in ls_reject_code
      // Q up a Logout Request
      printk("Login Payload unacceptable\n");

    }
    break;


  // PDISC logic very similar to PLOGI, except we never want
  // to allocate mem for "new" port, and we set flags differently
  // (might combine later with PLOGI logic for efficiency)  
  case ELS_PDISC:  // we sent out PDISC
    if( !verify_PLOGI( fcChip, fchs, &ls_reject_code) )
    {
      LOGIN_PAYLOAD logi;       // FC-PH Port Login
      BOOLEAN NeedLogin = FALSE;
      
      // login payload acceptable; search for WWN in our list
      // of (previously seen) fcPorts
      
      BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&logi, sizeof(logi));
   
      pLoggedInPort = fcFindLoggedInPort( 
             fcChip, 
	     NULL,     // don't search Scsi Nexus
	     0,        // don't search linked list for port_id
             &logi.port_name[0],     // search linked list for WWN
             &pLastLoggedInPort);  // must return non-NULL; when a port_id
                                   // is not found, this pointer marks the
                                   // end of the singly linked list
    
      if( pLoggedInPort != NULL)   // WWN found?
      {
        // WWN has same port_id as last login?  (Of course, a properly
	// working FC device should NEVER ACCept a PDISC if it's
	// port_id changed, but check just in case...)
	if( (fchs->s_id & 0xFFFFFF) == pLoggedInPort->port_id)
	{
          // Yes.  We were expecting PDISC?
          if( pLoggedInPort->pdisc )
	  {
            int i;
	    
	    
	    // PDISC expected -- set fields.  (PDISC, Originator)
            SetLoginFields( pLoggedInPort, fchs, TRUE, TRUE);

	    // We are ready to resume FCP-SCSI to this device...
            // Do we need to start anything that was Queued?

            for( i=0; i< TACH_SEST_LEN; i++)
            {
              // see if any exchange for this PDISC'd port was queued
              if( ((fchs->s_id &0xFFFFFF) == 
                   (Exchanges->fcExchange[i].fchs.d_id & 0xFFFFFF))
                      &&
                  (Exchanges->fcExchange[i].status & EXCHANGE_QUEUED))
              {
                fchs->reserved = i; // copy ExchangeID
//                printk(" *Q x_ID %Xh after PDISC* ",i);

                cpqfcTSPutLinkQue( cpqfcHBAdata, EXCHANGE_QUEUED, fchs );
              }
            }

	    // Complete commands Q'd while we were waiting for Login

	    UnblockScsiDevice( cpqfcHBAdata->HostAdapter, pLoggedInPort);
	  }
	  else
	  {
	    printk("Not expecting PDISC (pdisc=FALSE)\n");
	    NeedLogin = TRUE;
	  }
	}
	else
	{
	  printk("PDISC PortID change: old %Xh, new %Xh\n",
            pLoggedInPort->port_id, fchs->s_id &0xFFFFFF);
          NeedLogin = TRUE;
		  
	}
      }
      else
      {
	printk("PDISC ACC from unknown WWN\n");
        NeedLogin = TRUE;
      }

      if( NeedLogin)
      {
	
        // The PDISC failed.  Set login struct flags accordingly,
	// terminate any I/O to this port, and Q a PLOGI
	if( pLoggedInPort )  // FC device previously known?
	{

          cpqfcTSPutLinkQue( cpqfcHBAdata,
                    ELS_LOGO, // Q Type
                    fchs );   // has port_id to send to 

	  // There are a variety of error scenarios which can result
  	  // in PDISC failure, so as a catchall, add the check for
	  // duplicate port_id.
	  TestDuplicatePortId( cpqfcHBAdata, pLoggedInPort);

//    TriggerHBA( fcChip->Registers.ReMapMemBase, 0);
          pLoggedInPort->pdisc = FALSE;
          pLoggedInPort->prli = FALSE;
          pLoggedInPort->plogi = FALSE;
	
          cpqfcTSTerminateExchange( cpqfcHBAdata, 
	    &pLoggedInPort->ScsiNexus, PORTID_CHANGED);
        }
        cpqfcTSPutLinkQue( cpqfcHBAdata, ELS_PLOGI, fchs );
      }
    }
    else
    {
      // login payload unacceptable - reason in ls_reject_code
      // Q up a Logout Request
      printk("ERROR: Login Payload unacceptable!\n");

    }
   
    break;
    


  case ELS_PRLI:  // we sent out PRLI


    pLoggedInPort = fcFindLoggedInPort( 
           fcChip, 
           NULL,       // don't search Scsi Nexus
	   (fchs->s_id & 0xFFFFFF),  // search linked list for port_id
           NULL,     // DON'T search linked list for WWN
           NULL);    // don't care
      
    if( pLoggedInPort == NULL ) 
    {
      // huh?
      printk(" Unexpected PRLI ACCept frame!\n");

      // Q a LOGOut here?

      goto Done;
    }

    // verify the PRLI ACC payload
    if( !verify_PRLI( fchs, &ls_reject_code) )
    {
      // PRLI Reply is acceptable; were we expecting it?
      if( pLoggedInPort->plogi ) 
      { 
	// yes, we expected the PRLI ACC  (not PDISC; Originator)
	SetLoginFields( pLoggedInPort, fchs, FALSE, TRUE);

        // OK, let's send a REPORT_LUNS command to determine
	// whether VSA or PDA FCP-LUN addressing is used.
	
        cpqfcTSPutLinkQue( cpqfcHBAdata, SCSI_REPORT_LUNS, fchs );
	
	// It's possible that a device we were talking to changed 
	// port_id, and has logged back in.  This function ensures
	// that I/O will resume.
        UnblockScsiDevice( cpqfcHBAdata->HostAdapter, pLoggedInPort);

      }
      else
      {
        // huh?
        printk(" (unexpected) PRLI ACCept with plogi FALSE\n");

        // Q a LOGOut here?
        goto Done;
      }
    }
    else
    {
      printk(" PRLI ACCept payload failed verify\n");

      // Q a LOGOut here?
    }

    break;
 
  case ELS_FLOGI:  // we sent out FLOGI (Fabric Login)

    // update the upper 16 bits of our port_id in Tachyon
    // the switch adds those upper 16 bits when responding
    // to us (i.e. we are the destination_id)
    fcChip->Registers.my_al_pa = (fchs->d_id & 0xFFFFFF);
    writel( fcChip->Registers.my_al_pa,  
      fcChip->Registers.ReMapMemBase + TL_MEM_TACH_My_ID);

    // now send out a PLOGI to the well known port_id 0xFFFFFC
    fchs->s_id = 0xFFFFFC;
    cpqfcTSPutLinkQue( cpqfcHBAdata, ELS_PLOGI, fchs);
  
   break; 


  case ELS_FDISC:  // we sent out FDISC (Fabric Discovery (Login))

   printk( " ELS_FDISC success ");
   break;
   

  case ELS_SCR:  // we sent out State Change Registration
    // now we can issue Name Service Request to find any
    // Fabric-connected devices we might want to login to.
   
	
    fchs->s_id = 0xFFFFFC;  // Name Server Address
    cpqfcTSPutLinkQue( cpqfcHBAdata, FCS_NSR, fchs);
    

    break;

    
  default:
    printk(" *Discarding unknown ACC frame, xID %04X/%04X* ", 
   		    ox_id, fchs->ox_rx_id & 0xffff);
    break;
  }

  
Done:
  // Regardless of whether the Reply is valid or not, the
  // the exchange is done - complete
  cpqfcTSCompleteExchange(cpqfcHBAdata->PciDev, fcChip, (fchs->ox_rx_id >>16)); 
	  
Quit:    
  return;
}






// ****************  Fibre Channel Services  **************
// This is where we process the Directory (Name) Service Reply
// to know which devices are on the Fabric

static void ProcessFCS_Reply( 
	CPQFCHBA* cpqfcHBAdata, TachFCHDR_GCMND* fchs)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG ox_id = (fchs->ox_rx_id >>16);
//  ULONG ls_reject_code;
//  PFC_LOGGEDIN_PORT pLoggedInPort, pLastLoggedInPort;
  
  // If this is a valid reply, then we MUST have sent a request.
  // Verify that we can find a valid request OX_ID corresponding to
  // this reply

  if( Exchanges->fcExchange[(fchs->ox_rx_id >>16)].type == 0)
  {
    printk(" *Discarding Reply frame, xID %04X/%04X* ", 
		    ox_id, fchs->ox_rx_id & 0xffff);
    goto Quit;  // exit this routine
  }


  // OK, we were expecting it.  Now check to see if it's a
  // "Name Service" Reply, and if so force a re-validation of
  // Fabric device logins (i.e. Start the login timeout and
  // send PDISC or PLOGI)
  // (Endianess Byte Swap?)
  if( fchs->pl[1] == 0x02FC )  // Name Service
  {
    // got a new (or NULL) list of Fabric attach devices... 
    // Invalidate current logins
    
    PFC_LOGGEDIN_PORT pLoggedInPort = &fcChip->fcPorts;
    while( pLoggedInPort ) // for all ports which are expecting
                           // PDISC after the next LIP, set the
                           // logoutTimer
    {

      if( (pLoggedInPort->port_id & 0xFFFF00)  // Fabric device?
		      &&
          (pLoggedInPort->port_id != 0xFFFFFC) ) // NOT the F_Port
      {
        pLoggedInPort->LOGO_timer = 6;  // what's the Fabric timeout??
                                // suspend any I/O in progress until
                                // PDISC received...
        pLoggedInPort->prli = FALSE;   // block FCP-SCSI commands
      }
	    
      pLoggedInPort = pLoggedInPort->pNextPort;
    }
    
    if( fchs->pl[2] == 0x0280)  // ACCept?
    {
      // Send PLOGI or PDISC to these Fabric devices
      SendLogins( cpqfcHBAdata, &fchs->pl[4] );  
    }


    // As of this writing, the only reason to reject is because NO
    // devices are left on the Fabric.  We already started
    // "logged out" timers; if the device(s) don't come
    // back, we'll do the implicit logout in the heart beat 
    // timer routine
    else  // ReJecT
    {
      // this just means no Fabric device is visible at this instant
    } 
  }

  // Regardless of whether the Reply is valid or not, the
  // the exchange is done - complete
  cpqfcTSCompleteExchange(cpqfcHBAdata->PciDev, fcChip, (fchs->ox_rx_id >>16));
	  
Quit:    
  return;
}







static void AnalyzeIncomingFrame( 
        CPQFCHBA *cpqfcHBAdata,
        ULONG QNdx )
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  PFC_LINK_QUE fcLQ = cpqfcHBAdata->fcLQ;
  TachFCHDR_GCMND* fchs = 
    (TachFCHDR_GCMND*)fcLQ->Qitem[QNdx].ulBuff;
//  ULONG ls_reject_code;  // reason for rejecting login
  LONG ExchangeID;
//  FC_LOGGEDIN_PORT *pLoggedInPort;
  BOOLEAN AbortAccept;  

  ENTER("AnalyzeIncomingFrame");



  switch( fcLQ->Qitem[QNdx].Type) // FCP or Unknown
  {

  case SFQ_UNKNOWN:  // unknown frame (e.g. LIP position frame, NOP, etc.)
 

      // *********  FC-4 Device Data/ Fibre Channel Service *************
    if( ((fchs->d_id &0xF0000000) == 0)   // R_CTL (upper nibble) 0x0?
                &&   
      (fchs->f_ctl & 0x20000000) )  // TYPE 20h is Fibre Channel Service
    {

      // ************** FCS Reply **********************

      if( (fchs->d_id & 0xff000000L) == 0x03000000L)  // (31:23 R_CTL)
      {
	ProcessFCS_Reply( cpqfcHBAdata, fchs );

      }  // end of  FCS logic

    }
    

      // ***********  Extended Link Service **************

    else if( fchs->d_id & 0x20000000   // R_CTL 0x2?
                  &&   
      (fchs->f_ctl & 0x01000000) )  // TYPE = 1
    {

                           // these frames are either a response to
                           // something we sent (0x23) or "unsolicited"
                           // frames (0x22).


      // **************Extended Link REPLY **********************
                           // R_CTL Solicited Control Reply

      if( (fchs->d_id & 0xff000000L) == 0x23000000L)  // (31:23 R_CTL)
      {

	ProcessELS_Reply( cpqfcHBAdata, fchs );

      }  // end of  "R_CTL Solicited Control Reply"




       // **************Extended Link REQUEST **********************
       // (unsolicited commands from another port or task...)

                           // R_CTL Ext Link REQUEST
      else if( (fchs->d_id & 0xff000000L) == 0x22000000L &&
              (fchs->ox_rx_id != 0xFFFFFFFFL) ) // (ignore LIP frame)
      {



	ProcessELS_Request( cpqfcHBAdata, fchs );

      }



        // ************** LILP **********************
      else if( (fchs->d_id & 0xff000000L) == 0x22000000L &&
               (fchs->ox_rx_id == 0xFFFFFFFFL)) // (e.g., LIP frames)

      {
        // SANMark specifies that when available, we must use
	// the LILP frame to determine which ALPAs to send Port Discovery
	// to...

        if( fchs->pl[0] == 0x0711L) //  ELS_PLOGI?
	{
//	  UCHAR *ptr = (UCHAR*)&fchs->pl[1];
//	  printk(" %d ALPAs found\n", *ptr);
	  memcpy( fcChip->LILPmap, &fchs->pl[1], 32*4); // 32 DWORDs
	  fcChip->Options.LILPin = 1; // our LILPmap is valid!
	  // now post to make Port Discovery happen...
          cpqfcTSPutLinkQue( cpqfcHBAdata, LINKACTIVE, fchs);  
	}
      }
    }

     
    // *****************  BASIC LINK SERVICE *****************
    
    else if( fchs->d_id & 0x80000000  // R_CTL:
                    &&           // Basic Link Service Request
           !(fchs->f_ctl & 0xFF000000) )  // type=0 for BLS
    {

      // Check for ABTS (Abort Sequence)
      if( (fchs->d_id & 0x8F000000) == 0x81000000)
      {
        // look for OX_ID, S_ID pair that matches in our
        // fcExchanges table; if found, reply with ACCept and complete
        // the exchange

        // Per PLDA, an ABTS is sent by an initiator; therefore
        // assume that if we have an exhange open to the port who
        // sent ABTS, it will be the d_id of what we sent.  
        for( ExchangeID = 0, AbortAccept=FALSE;
             ExchangeID < TACH_SEST_LEN; ExchangeID++)
        {
            // Valid "target" exchange 24-bit port_id matches? 
            // NOTE: For the case of handling Intiator AND Target
            // functions on the same chip, we can have TWO Exchanges
            // with the same OX_ID -- OX_ID/FFFF for the CMND, and
            // OX_ID/RX_ID for the XRDY or DATA frame(s).  Ideally,
            // we would like to support ABTS from Initiators or Targets,
            // but it's not clear that can be supported on Tachyon for
            // all cases (requires more investigation).
            
          if( (Exchanges->fcExchange[ ExchangeID].type == SCSI_TWE ||
               Exchanges->fcExchange[ ExchangeID].type == SCSI_TRE)
                  &&
             ((Exchanges->fcExchange[ ExchangeID].fchs.d_id & 0xFFFFFF) ==
             (fchs->s_id & 0xFFFFFF)) )
          {
              
              // target xchnge port_id matches -- how about OX_ID?
            if( (Exchanges->fcExchange[ ExchangeID].fchs.ox_rx_id &0xFFFF0000)
                    == (fchs->ox_rx_id & 0xFFFF0000) )
                    // yes! post ACCept response; will be completed by fcStart
            {
              Exchanges->fcExchange[ ExchangeID].status = TARGET_ABORT;
                
                // copy (add) rx_id field for simplified ACCept reply
              fchs->ox_rx_id = 
                Exchanges->fcExchange[ ExchangeID].fchs.ox_rx_id;
                
              cpqfcTSPutLinkQue( cpqfcHBAdata,
                            BLS_ABTS_ACC, // Q Type 
                            fchs );    // void QueContent
              AbortAccept = TRUE;
      printk("ACCepting ABTS for x_ID %8.8Xh, SEST pair %8.8Xh\n", 
             fchs->ox_rx_id, Exchanges->fcExchange[ ExchangeID].fchs.ox_rx_id);
              break;      // ABTS can affect only ONE exchange -exit loop
            }
          }
        }  // end of FOR loop
        if( !AbortAccept ) // can't ACCept ABTS - send Reject
        {
      printk("ReJecTing: can't find ExchangeID %8.8Xh for ABTS command\n", 
            fchs->ox_rx_id);
          if( Exchanges->fcExchange[ ExchangeID].type 
                &&
              !(fcChip->SEST->u[ ExchangeID].IWE.Hdr_Len
               & 0x80000000))
          {
            cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, ExchangeID);
          }
          else
          {
            printk("Unexpected ABTS ReJecT! SEST[%X] Dword 0: %Xh\n", 
              ExchangeID, fcChip->SEST->u[ ExchangeID].IWE.Hdr_Len);
          }
        }
      }

      // Check for BLS {ABTS? (Abort Sequence)} ACCept
      else if( (fchs->d_id & 0x8F000000) == 0x84000000)
      {
        // target has responded with ACC for our ABTS;
	// complete the indicated exchange with ABORTED status 
        // Make no checks for correct RX_ID, since
	// all we need to conform ABTS ACC is the OX_ID.
        // Verify that the d_id matches!
 
        ExchangeID = (fchs->ox_rx_id >> 16) & 0x7FFF; // x_id from ACC
//	printk("ABTS ACC x_ID 0x%04X 0x%04X, status %Xh\n", 
//          fchs->ox_rx_id >> 16, fchs->ox_rx_id & 0xffff,
//          Exchanges->fcExchange[ExchangeID].status);


	
        if( ExchangeID < TACH_SEST_LEN ) // x_ID makes sense
        {
            // Does "target" exchange 24-bit port_id match? 
            // (See "NOTE" above for handling Intiator AND Target in
            // the same device driver)
            // First, if this is a target response, then we originated
	    // (initiated) it with BLS_ABTS:
	  
          if( (Exchanges->fcExchange[ ExchangeID].type == BLS_ABTS)

                  &&
	    // Second, does the source of this ACC match the destination
            // of who we originally sent it to?
             ((Exchanges->fcExchange[ ExchangeID].fchs.d_id & 0xFFFFFF) ==
             (fchs->s_id & 0xFFFFFF)) )
          {
            cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, ExchangeID );
	  }
        }              
      }
      // Check for BLS {ABTS? (Abort Sequence)} ReJecT
      else if( (fchs->d_id & 0x8F000000) == 0x85000000)
      {
        // target has responded with RJT for our ABTS;
	// complete the indicated exchange with ABORTED status 
        // Make no checks for correct RX_ID, since
	// all we need to conform ABTS ACC is the OX_ID.
        // Verify that the d_id matches!
 
        ExchangeID = (fchs->ox_rx_id >> 16) & 0x7FFF; // x_id from ACC
//	printk("BLS_ABTS RJT on Exchange 0x%04X 0x%04X\n", 
//          fchs->ox_rx_id >> 16, fchs->ox_rx_id & 0xffff);

        if( ExchangeID < TACH_SEST_LEN ) // x_ID makes sense
	{  
            // Does "target" exchange 24-bit port_id match? 
            // (See "NOTE" above for handling Intiator AND Target in
            // the same device driver)
            // First, if this is a target response, then we originated
	    // (initiated) it with BLS_ABTS:
		  
          if( (Exchanges->fcExchange[ ExchangeID].type == BLS_ABTS)

                  &&
	    // Second, does the source of this ACC match the destination
            // of who we originally sent it to?
             ((Exchanges->fcExchange[ ExchangeID].fchs.d_id & 0xFFFFFF) ==
             (fchs->s_id & 0xFFFFFF)) )
          {
	    // YES! NOTE: There is a bug in CPQ's RA-4000 box 
	    // where the "reason code" isn't returned in the payload
	    // For now, simply presume the reject is because the target
	    // already completed the exchange...
	    
//            printk("complete x_ID %Xh on ABTS RJT\n", ExchangeID);
            cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, ExchangeID );
	  }
	} 
      }  // end of ABTS check
    }  // end of Basic Link Service Request
    break;
  
    default:
      printk("AnalyzeIncomingFrame: unknown type: %Xh(%d)\n",
        fcLQ->Qitem[QNdx].Type,
        fcLQ->Qitem[QNdx].Type);
    break;
  }
}


// Function for Port Discovery necessary after every FC 
// initialization (e.g. LIP).
// Also may be called if from Fabric Name Service logic.

static void SendLogins( CPQFCHBA *cpqfcHBAdata, __u32 *FabricPortIds )
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG ulStatus=0;
  TachFCHDR_GCMND fchs;  // copy fields for transmission
  int i;
  ULONG loginType;
  LONG ExchangeID;
  PFC_LOGGEDIN_PORT pLoggedInPort;
  __u32 PortIds[ number_of_al_pa];
  int NumberOfPorts=0;

  // We're going to presume (for now) that our limit of Fabric devices
  // is the same as the number of alpa on a private loop (126 devices).
  // (Of course this could be changed to support however many we have
  // memory for).
  memset( &PortIds[0], 0, sizeof(PortIds));
   
  // First, check if this login is for our own Link Initialization
  // (e.g. LIP on FC-AL), or if we have knowledge of Fabric devices
  // from a switch.  If we are logging into Fabric devices, we'll
  // have a non-NULL FabricPortId pointer
  
  if( FabricPortIds != NULL) // may need logins
  {
    int LastPort=FALSE;
    i = 0;
    while( !LastPort)
    {
      // port IDs From NSR payload; byte swap needed?
      BigEndianSwap( (UCHAR*)FabricPortIds, (UCHAR*)&PortIds[i], 4);
 
//      printk("FPortId[%d] %Xh ", i, PortIds[i]);
      if( PortIds[i] & 0x80000000)
	LastPort = TRUE;
      
      PortIds[i] &= 0xFFFFFF; // get 24-bit port_id
      // some non-Fabric devices (like the Crossroads Fibre/Scsi bridge)
      // erroneously use ALPA 0.
      if( PortIds[i]  ) // need non-zero port_id...
        i++;
      
      if( i >= number_of_al_pa ) // (in)sanity check
	break;
      FabricPortIds++;  // next...
    }

    NumberOfPorts = i;
//    printk("NumberOf Fabric ports %d", NumberOfPorts);
  }
  
  else  // need to send logins on our "local" link
  {
  
    // are we a loop port?  If so, check for reception of LILP frame,
    // and if received use it (SANMark requirement)
    if( fcChip->Options.LILPin )
    {
      int j=0;
      // sanity check on number of ALPAs from LILP frame...
      // For format of LILP frame, see FC-AL specs or 
      // "Fibre Channel Bench Reference", J. Stai, 1995 (ISBN 1-879936-17-8)
      // First byte is number of ALPAs
      i = fcChip->LILPmap[0] >= (32*4) ? 32*4 : fcChip->LILPmap[0];
      NumberOfPorts = i;
//      printk(" LILP alpa count %d ", i);
      while( i > 0)
      {
	PortIds[j] = fcChip->LILPmap[1+ j];
	j++; i--;
      }
    }
    else  // have to send login to everybody
    {
      int j=0;
      i = number_of_al_pa;
      NumberOfPorts = i;
      while( i > 0)
      {
        PortIds[j] = valid_al_pa[j]; // all legal ALPAs
	j++; i--;
      }
    }
  }


  // Now we have a copy of the port_ids (and how many)...
  for( i = 0; i < NumberOfPorts; i++)
  {
    // 24-bit FC Port ID
    fchs.s_id = PortIds[i];  // note: only 8-bits used for ALPA


    // don't log into ourselves (Linux Scsi disk scan will stop on
    // no TARGET support error on us, and quit trying for rest of devices)
    if( (fchs.s_id & 0xFF ) == (fcChip->Registers.my_al_pa & 0xFF) )
      continue;

    // fabric login needed?
    if( (fchs.s_id == 0) || 
        (fcChip->Options.fabric == 1) )
    {
      fcChip->Options.flogi = 1;  // fabric needs longer for login
      // Do we need FLOGI or FDISC?
      pLoggedInPort = fcFindLoggedInPort( 
             fcChip, 
             NULL,           // don't search SCSI Nexus
             0xFFFFFC,       // search linked list for Fabric port_id
             NULL,           // don't search WWN
             NULL);          // (don't care about end of list)

      if( pLoggedInPort )    // If found, we have prior experience with
                             // this port -- check whether PDISC is needed
      {
        if( pLoggedInPort->flogi )
	{
	  // does the switch support FDISC?? (FLOGI for now...)
          loginType = ELS_FLOGI;  // prior FLOGI still valid
	}
        else
          loginType = ELS_FLOGI;  // expired FLOGI
      }
      else                      // first FLOGI?
        loginType = ELS_FLOGI;  


      fchs.s_id = 0xFFFFFE;   // well known F_Port address

      // Fabrics are not required to support FDISC, and
      // it's not clear if that helps us anyway, since
      // we'll want a Name Service Request to re-verify
      // visible devices...
      // Consequently, we always want our upper 16 bit
      // port_id to be zero (we'll be rejected if we
      // use our prior port_id if we've been plugged into
      // a different switch port).
      // Trick Tachyon to send to ALPA 0 (see TL/TS UG, pg 87)
      // If our ALPA is 55h for instance, we want the FC frame
      // s_id to be 0x000055, while Tach's my_al_pa register
      // must be 0x000155, to force an OPN at ALPA 0 
      // (the Fabric port)
      fcChip->Registers.my_al_pa &= 0xFF; // only use ALPA for FLOGI
      writel( fcChip->Registers.my_al_pa | 0x0100,  
        fcChip->Registers.ReMapMemBase + TL_MEM_TACH_My_ID);
    }

    else // not FLOGI...
    {
      // should we send PLOGI or PDISC?  Check if any prior port_id
      // (e.g. alpa) completed a PLOGI/PRLI exchange by checking 
      // the pdisc flag.

      pLoggedInPort = fcFindLoggedInPort( 
             fcChip, 
             NULL,           // don't search SCSI Nexus
             fchs.s_id,      // search linked list for al_pa
             NULL,           // don't search WWN
             NULL);          // (don't care about end of list)

             

      if( pLoggedInPort )      // If found, we have prior experience with
                             // this port -- check whether PDISC is needed
      {
        if( pLoggedInPort->pdisc )
	{
          loginType = ELS_PDISC;  // prior PLOGI and PRLI maybe still valid
           
	}
        else
          loginType = ELS_PLOGI;  // prior knowledge, but can't use PDISC
      }
      else                      // never talked to this port_id before
        loginType = ELS_PLOGI;  // prior knowledge, but can't use PDISC
    }


    
    ulStatus = cpqfcTSBuildExchange(
          cpqfcHBAdata,
          loginType,            // e.g. PLOGI
          &fchs,        // no incoming frame (we are originator)
          NULL,         // no data (no scatter/gather list)
          &ExchangeID );// fcController->fcExchanges index, -1 if failed

    if( !ulStatus ) // Exchange setup OK?
    {
      ulStatus = cpqfcTSStartExchange( cpqfcHBAdata, ExchangeID );
      if( !ulStatus )
      {
          // submitted to Tach's Outbound Que (ERQ PI incremented)
          // waited for completion for ELS type (Login frames issued
          // synchronously)

	if( loginType == ELS_PDISC )
	{
	  // now, we really shouldn't Revalidate SEST exchanges until
	  // we get an ACC reply from our target and verify that
	  // the target address/WWN is unchanged.  However, when a fast
	  // target gets the PDISC, they can send SEST Exchange data
	  // before we even get around to processing the PDISC ACC.
	  // Consequently, we lose the I/O.
	  // To avoid this, go ahead and Revalidate when the PDISC goes
	  // out, anticipating that the ACC will be truly acceptable
	  // (this happens 99.9999....% of the time).
	  // If we revalidate a SEST write, and write data goes to a
	  // target that is NOT the one we originated the WRITE to,
	  // that target is required (FCP-SCSI specs, etc) to discard 
	  // our WRITE data.

          // Re-validate SEST entries (Tachyon hardware assists)
          RevalidateSEST( cpqfcHBAdata->HostAdapter, pLoggedInPort); 
    //TriggerHBA( fcChip->Registers.ReMapMemBase, 1);
	}
      }
      else  // give up immediately on error
      {
#ifdef LOGIN_DBG
        printk("SendLogins: fcStartExchange failed: %Xh\n", ulStatus );
#endif
        break;
      }

              
      if( fcChip->Registers.FMstatus.value & 0x080 ) // LDn during Port Disc.
      {
        ulStatus = LNKDWN_OSLS;
#ifdef LOGIN_DBG
        printk("SendLogins: PortDisc aborted (LDn) @alpa %Xh\n", fchs.s_id);
#endif
        break;
      }
        // Check the exchange for bad status (i.e. FrameTimeOut),
        // and complete on bad status (most likely due to BAD_ALPA)
        // on LDn, DPC function may already complete (ABORT) a started
        // exchange, so check type first (type = 0 on complete).
      if( Exchanges->fcExchange[ExchangeID].status )
      {
#ifdef LOGIN_DBG 
 	printk("completing x_ID %X on status %Xh\n", 
          ExchangeID, Exchanges->fcExchange[ExchangeID].status);
#endif
        cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, ExchangeID);
      }
    }
    else   // Xchange setup failed...
    {
#ifdef LOGIN_DBG
      printk("FC: cpqfcTSBuildExchange failed: %Xh\n", ulStatus );
#endif
      break;
    }
  }
  if( !ulStatus )
  {
    // set the event signifying that all ALPAs were sent out.
#ifdef LOGIN_DBG
    printk("SendLogins: PortDiscDone\n");
#endif
    cpqfcHBAdata->PortDiscDone = 1;


    // TL/TS UG, pg. 184
    // 0x0065 = 100ms for RT_TOV
    // 0x01f5 = 500ms for ED_TOV
    fcChip->Registers.ed_tov.value = 0x006501f5L; 
    writel( fcChip->Registers.ed_tov.value,
      (fcChip->Registers.ed_tov.address));

    // set the LP_TOV back to ED_TOV (i.e. 500 ms)
    writel( 0x00000010, fcChip->Registers.ReMapMemBase +TL_MEM_FM_TIMEOUT2);
  }
  else
  {
    printk("SendLogins: failed at xchng %Xh, alpa %Xh, status %Xh\n", 
      ExchangeID, fchs.s_id, ulStatus);
  }
  LEAVE("SendLogins");

}


// for REPORT_LUNS documentation, see "In-Depth Exploration of Scsi",
// D. Deming, 1994, pg 7-19 (ISBN 1-879936-08-9)
static void ScsiReportLunsDone(Scsi_Cmnd *Cmnd)
{
  struct Scsi_Host *HostAdapter = Cmnd->device->host;
  CPQFCHBA *cpqfcHBAdata = (CPQFCHBA *)HostAdapter->hostdata;
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  PFC_LOGGEDIN_PORT pLoggedInPort; 
  int LunListLen=0;
  int i;
  ULONG x_ID = 0xFFFFFFFF;
  UCHAR *ucBuff = Cmnd->request_buffer;

//  printk("cpqfcTS: ReportLunsDone \n");
  // first, we need to find the Exchange for this command,
  // so we can find the fcPort struct to make the indicated
  // changes.
  for( i=0; i< TACH_SEST_LEN; i++)
  {
    if( Exchanges->fcExchange[i].type   // exchange defined?
                   &&
       (Exchanges->fcExchange[i].Cmnd == Cmnd) ) // matches?
	      
    {
      x_ID = i;  // found exchange!
      break;
    }
  }
  if( x_ID == 0xFFFFFFFF)
  {
//    printk("cpqfcTS: ReportLuns failed - no FC Exchange\n");
    goto Done;  // Report Luns FC Exchange gone; 
                // exchange probably Terminated by Implicit logout
  }


  // search linked list for the port_id we sent INQUIRY to
  pLoggedInPort = fcFindLoggedInPort( fcChip,
    NULL,     // DON'T search Scsi Nexus (we will set it)
    Exchanges->fcExchange[ x_ID].fchs.d_id & 0xFFFFFF,        
    NULL,     // DON'T search linked list for FC WWN
    NULL);    // DON'T care about end of list
 
  if( !pLoggedInPort )
  {
//    printk("cpqfcTS: ReportLuns failed - device gone\n");
    goto Done; // error! can't find logged in Port
  }    
  LunListLen = ucBuff[3];
  LunListLen += ucBuff[2]>>8;

  if( !LunListLen )  // failed
  {
    // generically speaking, a soft error means we should retry...
    if( (Cmnd->result >> 16) == DID_SOFT_ERROR )
    {
      if( ((Cmnd->sense_buffer[2] & 0xF) == 0x6) &&
	        (Cmnd->sense_buffer[12] == 0x29) ) // Sense Code "reset"
      {
        TachFCHDR_GCMND *fchs = &Exchanges->fcExchange[ x_ID].fchs;
      // did we fail because of "check condition, device reset?"
      // e.g. the device was reset (i.e., at every power up)
      // retry the Report Luns
      
      // who are we sending it to?
      // we know this because we have a copy of the command
      // frame from the original Report Lun command -
      // switch the d_id/s_id fields, because the Exchange Build
      // context is "reply to source".
      
        fchs->s_id = fchs->d_id; // (temporarily re-use the struct)
        cpqfcTSPutLinkQue( cpqfcHBAdata, SCSI_REPORT_LUNS, fchs );
      }
    }
    else  // probably, the device doesn't support Report Luns
      pLoggedInPort->ScsiNexus.VolumeSetAddressing = 0;  
  }
  else  // we have LUN info - check VSA mode
  {
    // for now, assume all LUNs will have same addr mode
    // for VSA, payload byte 8 will be 0x40; otherwise, 0
    pLoggedInPort->ScsiNexus.VolumeSetAddressing = ucBuff[8];  
      
    // Since we got a Report Luns answer, set lun masking flag
    pLoggedInPort->ScsiNexus.LunMasking = 1;

    if( LunListLen > 8*CPQFCTS_MAX_LUN)   // We expect CPQFCTS_MAX_LUN max
      LunListLen = 8*CPQFCTS_MAX_LUN;

/*   
    printk("Device WWN %08X%08X Reports Luns @: ", 
          (ULONG)(pLoggedInPort->u.liWWN &0xFFFFFFFF), 
          (ULONG)(pLoggedInPort->u.liWWN>>32));
	    
    for( i=8; i<LunListLen+8; i+=8)
    {  
      printk("%02X%02X ", ucBuff[i], ucBuff[i+1] );
    }
    printk("\n");
*/
    
    // Since the device was kind enough to tell us where the
    // LUNs are, lets ensure they are contiguous for Linux's
    // SCSI driver scan, which expects them to start at 0.
    // Since Linux only supports 8 LUNs, only copy the first
    // eight from the report luns command

    // e.g., the Compaq RA4x00 f/w Rev 2.54 and above may report
    // LUNs 4001, 4004, etc., because other LUNs are masked from
    // this HBA (owned by someone else).  We'll make those appear as
    // LUN 0, 1... to Linux
    {
      int j;
      int AppendLunList = 0;
      // Walk through the LUN list.  The 'j' array number is
      // Linux's lun #, while the value of .lun[j] is the target's
      // lun #.
      // Once we build a LUN list, it's possible for a known device 
      // to go offline while volumes (LUNs) are added.  Later,
      // the device will do another PLOGI ... Report Luns command,
      // and we must not alter the existing Linux Lun map.
      // (This will be very rare).
      for( j=0; j < CPQFCTS_MAX_LUN; j++)
      {
        if( pLoggedInPort->ScsiNexus.lun[j] != 0xFF )
	{
	  AppendLunList = 1;
	  break;
	}
      }
      if( AppendLunList )
      {
	int k;
        int FreeLunIndex;
//        printk("cpqfcTS: AppendLunList\n");

	// If we get a new Report Luns, we cannot change
	// any existing LUN mapping! (Only additive entry)
	// For all LUNs in ReportLun list
	// if RL lun != ScsiNexus lun
	//   if RL lun present in ScsiNexus lun[], continue
	//   else find ScsiNexus lun[]==FF and add, continue
	
        for( i=8, j=0; i<LunListLen+8 && j< CPQFCTS_MAX_LUN; i+=8, j++)
	{
          if( pLoggedInPort->ScsiNexus.lun[j] != ucBuff[i+1] )
	  {
	    // something changed from the last Report Luns
	    printk(" cpqfcTS: Report Lun change!\n");
	    for( k=0, FreeLunIndex=CPQFCTS_MAX_LUN; 
                 k < CPQFCTS_MAX_LUN; k++)
            {
	      if( pLoggedInPort->ScsiNexus.lun[k] == 0xFF)
	      {
		FreeLunIndex = k;
		break;
	      }
              if( pLoggedInPort->ScsiNexus.lun[k] == ucBuff[i+1] )
		break; // we already masked this lun
	    }
	    if( k >= CPQFCTS_MAX_LUN )
	    {
	      printk(" no room for new LUN %d\n", ucBuff[i+1]);
	    }
	    else if( k == FreeLunIndex )  // need to add LUN
	    {
	      pLoggedInPort->ScsiNexus.lun[k] = ucBuff[i+1];
//	      printk("add [%d]->%02d\n", k, pLoggedInPort->ScsiNexus.lun[k]);
	      
	    }
	    else
	    {
	      // lun already known
	    }
	    break;
	  }
	}
	// print out the new list...
	for( j=0; j< CPQFCTS_MAX_LUN; j++)
	{
	  if( pLoggedInPort->ScsiNexus.lun[j] == 0xFF)
	    break; // done
//	  printk("[%d]->%02d ", j, pLoggedInPort->ScsiNexus.lun[j]);
	}
      }
      else
      {
//	  printk("Linux SCSI LUNs[] -> Device LUNs: ");
	// first time - this is easy
        for( i=8, j=0; i<LunListLen+8 && j< CPQFCTS_MAX_LUN; i+=8, j++)
	{
          pLoggedInPort->ScsiNexus.lun[j] = ucBuff[i+1];
//	  printk("[%d]->%02d ", j, pLoggedInPort->ScsiNexus.lun[j]);
	}
//	printk("\n");
      }
    }
  }

Done: ;
}

extern int is_private_data_of_cpqfc(CPQFCHBA *hba, void * pointer);
extern void cpqfc_free_private_data(CPQFCHBA *hba, cpqfc_passthru_private_t *data);

static void 
call_scsi_done(Scsi_Cmnd *Cmnd)
{
	CPQFCHBA *hba;
	hba = (CPQFCHBA *) Cmnd->device->host->hostdata;
	// Was this command a cpqfc passthru ioctl ?
        if (Cmnd->sc_request != NULL && Cmnd->device->host != NULL && 
		Cmnd->device->host->hostdata != NULL &&
		is_private_data_of_cpqfc((CPQFCHBA *) Cmnd->device->host->hostdata,
			Cmnd->sc_request->upper_private_data)) {
		cpqfc_free_private_data(hba, 
			Cmnd->sc_request->upper_private_data);	
		Cmnd->sc_request->upper_private_data = NULL;
		Cmnd->result &= 0xff00ffff;
		Cmnd->result |= (DID_PASSTHROUGH << 16);  // prevents retry
	}
	if (Cmnd->scsi_done != NULL)
		(*Cmnd->scsi_done)(Cmnd);
}

// After successfully getting a "Process Login" (PRLI) from an
// FC port, we want to Discover the LUNs so that we know the
// addressing type (e.g., FCP-SCSI Volume Set Address, Peripheral
// Unit Device), and whether SSP (Selective Storage Presentation or
// Lun Masking) has made the LUN numbers non-zero based or 
// non-contiguous.  To remain backward compatible with the SCSI-2
// driver model, which expects a contiguous LUNs starting at 0,
// will use the ReportLuns info to map from "device" to "Linux" 
// LUNs.
static void IssueReportLunsCommand( 
              CPQFCHBA* cpqfcHBAdata, 
	      TachFCHDR_GCMND* fchs)
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  PFC_LOGGEDIN_PORT pLoggedInPort; 
  struct scsi_cmnd *Cmnd = NULL;
  struct scsi_device *ScsiDev = NULL;
  LONG x_ID;
  ULONG ulStatus;
  UCHAR *ucBuff;

  if( !cpqfcHBAdata->PortDiscDone) // cleared by LDn
  {
    printk("Discard Q'd ReportLun command\n");
    goto Done;
  }

  // find the device (from port_id) we're talking to
  pLoggedInPort = fcFindLoggedInPort( fcChip,
        NULL,     // DON'T search Scsi Nexus 
  	fchs->s_id & 0xFFFFFF,        
	NULL,     // DON'T search linked list for FC WWN
        NULL);    // DON'T care about end of list
  if( pLoggedInPort ) // we'd BETTER find it!
  {


    if( !(pLoggedInPort->fcp_info & TARGET_FUNCTION) )
      goto Done;  // forget it - FC device not a "target"

 
    ScsiDev = scsi_get_host_dev (cpqfcHBAdata->HostAdapter);
    if (!ScsiDev)
      goto Done;
    
    Cmnd = scsi_get_command (ScsiDev, GFP_KERNEL);
    if (!Cmnd) 
      goto Done;

    ucBuff = pLoggedInPort->ReportLunsPayload;
    
    memset( ucBuff, 0, REPORT_LUNS_PL);
    
    Cmnd->scsi_done = ScsiReportLunsDone;

    Cmnd->request_buffer = pLoggedInPort->ReportLunsPayload; 
    Cmnd->request_bufflen = REPORT_LUNS_PL; 
	    
    Cmnd->cmnd[0] = 0xA0;
    Cmnd->cmnd[8] = REPORT_LUNS_PL >> 8;
    Cmnd->cmnd[9] = (UCHAR)REPORT_LUNS_PL;
    Cmnd->cmd_len = 12;

    Cmnd->device->channel = pLoggedInPort->ScsiNexus.channel;
    Cmnd->device->id = pLoggedInPort->ScsiNexus.target;

	    
    ulStatus = cpqfcTSBuildExchange(
      cpqfcHBAdata,
      SCSI_IRE, 
      fchs,
      Cmnd,         // buffer for Report Lun data
      &x_ID );// fcController->fcExchanges index, -1 if failed

    if( !ulStatus ) // Exchange setup?
    {
      ulStatus = cpqfcTSStartExchange( cpqfcHBAdata, x_ID );
      if( !ulStatus )
      {
        // submitted to Tach's Outbound Que (ERQ PI incremented)
        // waited for completion for ELS type (Login frames issued
        // synchronously)
      }
      else
        // check reason for Exchange not being started - we might
        // want to Queue and start later, or fail with error
      {
  
      }
    }

    else   // Xchange setup failed...
      printk(" cpqfcTSBuildExchange failed: %Xh\n", ulStatus );
  }
  else     // like, we just got a PRLI ACC, and now the port is gone?
  {
    printk(" can't send ReportLuns - no login for port_id %Xh\n",
	    fchs->s_id & 0xFFFFFF);
  }



Done:

  if (Cmnd)
    scsi_put_command (Cmnd);
  if (ScsiDev) 
    scsi_free_host_dev (ScsiDev);
}







static void CompleteBoardLockCmnd( CPQFCHBA *cpqfcHBAdata)
{
  int i;
  for( i = CPQFCTS_REQ_QUEUE_LEN-1; i>= 0; i--)
  {
    if( cpqfcHBAdata->BoardLockCmnd[i] != NULL )
    {
      Scsi_Cmnd *Cmnd = cpqfcHBAdata->BoardLockCmnd[i];
      cpqfcHBAdata->BoardLockCmnd[i] = NULL;
      Cmnd->result = (DID_SOFT_ERROR << 16);  // ask for retry
//      printk(" BoardLockCmnd[%d] %p Complete, chnl/target/lun %d/%d/%d\n",
//        i,Cmnd, Cmnd->channel, Cmnd->target, Cmnd->lun);
      call_scsi_done(Cmnd);
    }
  }
}






// runs every 1 second for FC exchange timeouts and implicit FC device logouts

void cpqfcTSheartbeat( unsigned long ptr )
{
  CPQFCHBA *cpqfcHBAdata = (CPQFCHBA *)ptr;
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  PFC_LOGGEDIN_PORT pLoggedInPort = &fcChip->fcPorts; 
  ULONG i;
  unsigned long flags;
  DECLARE_MUTEX_LOCKED(BoardLock);
  
  PCI_TRACE( 0xA8)

  if( cpqfcHBAdata->BoardLock) // Worker Task Running?
    goto Skip;

  // STOP _que function
  spin_lock_irqsave( cpqfcHBAdata->HostAdapter->host_lock, flags); 

  PCI_TRACE( 0xA8)


  cpqfcHBAdata->BoardLock = &BoardLock; // stop Linux SCSI command queuing
  
  // release the IO lock (and re-enable interrupts)
  spin_unlock_irqrestore( cpqfcHBAdata->HostAdapter->host_lock, flags);
  
  // Ensure no contention from  _quecommand or Worker process 
  CPQ_SPINLOCK_HBA( cpqfcHBAdata)
  
  PCI_TRACE( 0xA8)
  

  disable_irq( cpqfcHBAdata->HostAdapter->irq);  // our IRQ

  // Complete the "bad target" commands (normally only used during
  // initialization, since we aren't supposed to call "scsi_done"
  // inside the queuecommand() function).  (this is overly contorted,
  // scsi_done can be safely called from queuecommand for
  // this bad target case.  May want to simplify this later)

  for( i=0; i< CPQFCTS_MAX_TARGET_ID; i++)
  {
    if( cpqfcHBAdata->BadTargetCmnd[i] )
    {
      Scsi_Cmnd *Cmnd = cpqfcHBAdata->BadTargetCmnd[i];
      cpqfcHBAdata->BadTargetCmnd[i] = NULL;
      Cmnd->result = (DID_BAD_TARGET << 16);
      call_scsi_done(Cmnd);
    }
    else
      break;
  }

  
  // logged in ports -- re-login check (ports required to verify login with
  // PDISC after LIP within 2 secs)

  // prevent contention
  while( pLoggedInPort ) // for all ports which are expecting
                         // PDISC after the next LIP, check to see if
                         // time is up!
  {
      // Important: we only detect "timeout" condition on TRANSITION
      // from non-zero to zero
    if( pLoggedInPort->LOGO_timer )  // time-out "armed"?
    {
      if( !(--pLoggedInPort->LOGO_timer) ) // DEC from 1 to 0?
      {
          // LOGOUT time!  Per PLDA, PDISC hasn't complete in 2 secs, so
          // issue LOGO request and destroy all I/O with other FC port(s).
        
/*          
        printk(" ~cpqfcTS heartbeat: LOGOut!~ ");
        printk("Linux SCSI Chanl/Target %d/%d (port_id %06Xh) WWN %08X%08X\n", 
        pLoggedInPort->ScsiNexus.channel, 
        pLoggedInPort->ScsiNexus.target, 
	pLoggedInPort->port_id,
          (ULONG)(pLoggedInPort->u.liWWN &0xFFFFFFFF), 
          (ULONG)(pLoggedInPort->u.liWWN>>32));

*/
        cpqfcTSImplicitLogout( cpqfcHBAdata, pLoggedInPort);

      }
      // else simply decremented - maybe next time...
    }
    pLoggedInPort = pLoggedInPort->pNextPort;
  }



  
  
  // ************  FC EXCHANGE TIMEOUT CHECK **************
  
  for( i=0; i< TACH_MAX_XID; i++)
  {
    if( Exchanges->fcExchange[i].type )  // exchange defined?
    {

      if( !Exchanges->fcExchange[i].timeOut ) // time expired
      {
        // Set Exchange timeout status
        Exchanges->fcExchange[i].status |= FC2_TIMEOUT;

        if( i >= TACH_SEST_LEN ) // Link Service Exchange
        {
          cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, i);  // Don't "abort" LinkService
        }
        
        else  // SEST Exchange TO -- may post ABTS to Worker Thread Que
        {
	  // (Make sure we don't keep timing it out; let other functions
	  // complete it or set the timeOut as needed)
	  Exchanges->fcExchange[i].timeOut = 30000; // seconds default

          if( Exchanges->fcExchange[i].type 
                  & 
              (BLS_ABTS | BLS_ABTS_ACC )  )
          {
	    // For BLS_ABTS*, an upper level might still have
	    // an outstanding command waiting for low-level completion.
	    // Also, in the case of a WRITE, we MUST get confirmation
	    // of either ABTS ACC or RJT before re-using the Exchange.
	    // It's possible that the RAID cache algorithm can hang
	    // if we fail to complete a WRITE to a LBA, when a READ
	    // comes later to that same LBA.  Therefore, we must
	    // ensure that the target verifies receipt of ABTS for
	    // the exchange
	   
	    printk("~TO Q'd ABTS (x_ID %Xh)~ ", i); 
//            TriggerHBA( fcChip->Registers.ReMapMemBase);

	    // On timeout of a ABTS exchange, check to
	    // see if the FC device has a current valid login.
	    // If so, restart it.
	    pLoggedInPort = fcFindLoggedInPort( fcChip,
              Exchanges->fcExchange[i].Cmnd, // find Scsi Nexus
              0,        // DON'T search linked list for FC port id
	      NULL,     // DON'T search linked list for FC WWN
              NULL);    // DON'T care about end of list

	    // device exists?
	    if( pLoggedInPort ) // device exists?
	    {
	      if( pLoggedInPort->prli ) // logged in for FCP-SCSI?
	      {
		// attempt to restart the ABTS
		printk(" ~restarting ABTS~ ");
                cpqfcTSStartExchange( cpqfcHBAdata, i );

	      }
	    }
          }
	  else  // not an ABTS
	  { 
           
            // We expect the WorkerThread to change the xchng type to
            // abort and set appropriate timeout.
            cpqfcTSPutLinkQue( cpqfcHBAdata, BLS_ABTS, &i ); // timed-out
	  }
        }
      }
      else  // time not expired...
      {
        // decrement timeout: 1 or more seconds left
        --Exchanges->fcExchange[i].timeOut;
      }
    }
  }


  enable_irq( cpqfcHBAdata->HostAdapter->irq);
 

  CPQ_SPINUNLOCK_HBA( cpqfcHBAdata)

  cpqfcHBAdata->BoardLock = NULL; // Linux SCSI commands may be queued

  // Now, complete any Cmnd we Q'd up while BoardLock was held

  CompleteBoardLockCmnd( cpqfcHBAdata);
 

  // restart the timer to run again (1 sec later)
Skip:
  mod_timer( &cpqfcHBAdata->cpqfcTStimer, jiffies + HZ);
  
  PCI_TRACEO( i, 0xA8)
  return;
}


// put valid FC-AL physical address in spec order
static const UCHAR valid_al_pa[]={
    0xef, 0xe8, 0xe4, 0xe2, 
    0xe1, 0xE0, 0xDC, 0xDA, 
    0xD9, 0xD6, 0xD5, 0xD4, 
    0xD3, 0xD2, 0xD1, 0xCe, 
    0xCd, 0xCc, 0xCb, 0xCa, 
    0xC9, 0xC7, 0xC6, 0xC5, 
    0xC3, 0xBc, 0xBa, 0xB9,
    0xB6, 0xB5, 0xB4, 0xB3, 
    0xB2, 0xB1, 0xae, 0xad,
    0xAc, 0xAb, 0xAa, 0xA9, 

    0xA7, 0xA6, 0xA5, 0xA3, 
    0x9f, 0x9e, 0x9d, 0x9b, 
    0x98, 0x97, 0x90, 0x8f, 
    0x88, 0x84, 0x82, 0x81, 
    0x80, 0x7c, 0x7a, 0x79, 
    0x76, 0x75, 0x74, 0x73, 
    0x72, 0x71, 0x6e, 0x6d, 
    0x6c, 0x6b, 0x6a, 0x69, 
    0x67, 0x66, 0x65, 0x63, 
    0x5c, 0x5a, 0x59, 0x56, 
    
    0x55, 0x54, 0x53, 0x52, 
    0x51, 0x4e, 0x4d, 0x4c, 
    0x4b, 0x4a, 0x49, 0x47, 
    0x46, 0x45, 0x43, 0x3c,
    0x3a, 0x39, 0x36, 0x35, 
    0x34, 0x33, 0x32, 0x31, 
    0x2e, 0x2d, 0x2c, 0x2b, 
    0x2a, 0x29, 0x27, 0x26, 
    0x25, 0x23, 0x1f, 0x1E,
    0x1d, 0x1b, 0x18, 0x17, 

    0x10, 0x0f, 8, 4, 2, 1 }; // ALPA 0 (Fabric) is special case

const int number_of_al_pa = (sizeof(valid_al_pa) );



// this function looks up an al_pa from the table of valid al_pa's
// we decrement from the last decimal loop ID, because soft al_pa
// (our typical case) are assigned with highest priority (and high al_pa)
// first.  See "In-Depth FC-AL", R. Kembel pg. 38
// INPUTS:
//   al_pa - 24 bit port identifier (8 bit al_pa on private loop)
// RETURN:
//  Loop ID - serves are index to array of logged in ports
//  -1      - invalid al_pa (not all 8 bit values are legal)

#if (0)
static int GetLoopID( ULONG al_pa )
{
  int i;

  for( i = number_of_al_pa -1; i >= 0; i--)  // dec.
  {
    if( valid_al_pa[i] == (UCHAR)al_pa )  // take lowest 8 bits
      return i;  // success - found valid al_pa; return decimal LoopID
  }
  return -1; // failed - not found
}
#endif

extern cpqfc_passthru_private_t *cpqfc_private(Scsi_Request *sr);

// Search the singly (forward) linked list "fcPorts" looking for 
// either the SCSI target (if != -1), port_id (if not NULL), 
// or WWN (if not null), in that specific order.
// If we find a SCSI nexus (from Cmnd arg), set the SCp.phase
// field according to VSA or PDU
// RETURNS:
//   Ptr to logged in port struct if found
//     (NULL if not found)
//   pLastLoggedInPort - ptr to last struct (for adding new ones)
// 
PFC_LOGGEDIN_PORT  fcFindLoggedInPort( 
  PTACHYON fcChip, 
  Scsi_Cmnd *Cmnd, // search linked list for Scsi Nexus (channel/target/lun)
  ULONG port_id,   // search linked list for al_pa, or
  UCHAR wwn[8],    // search linked list for WWN, or...
  PFC_LOGGEDIN_PORT *pLastLoggedInPort )
             
{
  PFC_LOGGEDIN_PORT pLoggedInPort = &fcChip->fcPorts; 
  BOOLEAN target_id_valid=FALSE;
  BOOLEAN port_id_valid=FALSE;
  BOOLEAN wwn_valid=FALSE;
  int i;


  if( Cmnd != NULL )
    target_id_valid = TRUE;
  
  else if( port_id ) // note! 24-bit NULL address is illegal
    port_id_valid = TRUE;

  else
  {
    if( wwn ) // non-null arg? (OK to pass NULL when not searching WWN)
    {
      for( i=0; i<8; i++)  // valid WWN passed?  NULL WWN invalid
      {
        if( wwn[i] != 0 )
          wwn_valid = TRUE;  // any non-zero byte makes (presumably) valid
      }
    }
  }
                // check other options ...


  // In case multiple search options are given, we use a priority
  // scheme:
  // While valid pLoggedIn Ptr
  //   If port_id is valid
  //     if port_id matches, return Ptr
  //   If wwn is valid
  //     if wwn matches, return Ptr
  //   Next Ptr in list
  //
  // Return NULL (not found)
 
      
  while( pLoggedInPort ) // NULL marks end of list (1st ptr always valid)
  {
    if( pLastLoggedInPort ) // caller's pointer valid?
      *pLastLoggedInPort = pLoggedInPort;  // end of linked list
    
    if( target_id_valid )
    {
      // check Linux Scsi Cmnd for channel/target Nexus match
      // (all luns are accessed through matching "pLoggedInPort")
      if( (pLoggedInPort->ScsiNexus.target == Cmnd->device->id)
                &&
          (pLoggedInPort->ScsiNexus.channel == Cmnd->device->channel))
      {
        // For "passthru" modes, the IOCTL caller is responsible
	// for setting the FCP-LUN addressing
	if (Cmnd->sc_request != NULL && Cmnd->device->host != NULL && 
		Cmnd->device->host->hostdata != NULL &&
		is_private_data_of_cpqfc((CPQFCHBA *) Cmnd->device->host->hostdata,
			Cmnd->sc_request->upper_private_data)) { 
		/* This is a passthru... */
		cpqfc_passthru_private_t *pd;
		pd = Cmnd->sc_request->upper_private_data;
        	Cmnd->SCp.phase = pd->bus;
		// Cmnd->SCp.have_data_in = pd->pdrive;
		Cmnd->SCp.have_data_in = Cmnd->device->lun;
	} else {
	  /* This is not a passthru... */
	
          // set the FCP-LUN addressing type
          Cmnd->SCp.phase = pLoggedInPort->ScsiNexus.VolumeSetAddressing;	

          // set the Device Type we got from the snooped INQUIRY string
	  Cmnd->SCp.Message = pLoggedInPort->ScsiNexus.InqDeviceType;

	  // handle LUN masking; if not "default" (illegal) lun value,
	  // the use it.  These lun values are set by a successful
	  // Report Luns command
          if( pLoggedInPort->ScsiNexus.LunMasking == 1) 
	  {
	    if (Cmnd->device->lun > sizeof(pLoggedInPort->ScsiNexus.lun))
		return NULL;
            // we KNOW all the valid LUNs... 0xFF is invalid!
            Cmnd->SCp.have_data_in = pLoggedInPort->ScsiNexus.lun[Cmnd->device->lun];
	    if (pLoggedInPort->ScsiNexus.lun[Cmnd->device->lun] == 0xFF)
		return NULL;
	    // printk("xlating lun %d to 0x%02x\n", Cmnd->lun, 
            //	pLoggedInPort->ScsiNexus.lun[Cmnd->lun]);
	  }
	  else
	    Cmnd->SCp.have_data_in = Cmnd->device->lun; // Linux & target luns match
	}
	break; // found it!
      }
    }
    
    if( port_id_valid ) // look for alpa first
    {
      if( pLoggedInPort->port_id == port_id )
          break;  // found it!
    }
    if( wwn_valid ) // look for wwn second
    {

      if( !memcmp( &pLoggedInPort->u.ucWWN[0], &wwn[0], 8))
      {  
                 // all 8 bytes of WWN match
        break;   // found it!
      }
    }
                
    pLoggedInPort = pLoggedInPort->pNextPort; // try next port
  }

  return pLoggedInPort;
}




// 
// We need to examine the SEST table and re-validate
// any open Exchanges for this LoggedInPort
// To make Tachyon pay attention, Freeze FCP assists,
// set VAL bits, Unfreeze FCP assists
static void RevalidateSEST( struct Scsi_Host *HostAdapter, 
		        PFC_LOGGEDIN_PORT pLoggedInPort)
{
  CPQFCHBA *cpqfcHBAdata = (CPQFCHBA *)HostAdapter->hostdata;
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG x_ID;
  BOOLEAN TachFroze = FALSE;
  
  
  // re-validate any SEST exchanges that are permitted
  // to survive the link down (e.g., good PDISC performed)
  for( x_ID = 0; x_ID < TACH_SEST_LEN; x_ID++)
  {

    // If the SEST entry port_id matches the pLoggedInPort,
    // we need to re-validate
    if( (Exchanges->fcExchange[ x_ID].type == SCSI_IRE)
         || 
	(Exchanges->fcExchange[ x_ID].type == SCSI_IWE))
    {
		     
      if( (Exchanges->fcExchange[ x_ID].fchs.d_id & 0xFFFFFF)  // (24-bit port ID)
            == pLoggedInPort->port_id) 
      {
//	printk(" re-val xID %Xh ", x_ID);
        if( !TachFroze )  // freeze if not already frozen
          TachFroze |= FreezeTach( cpqfcHBAdata);
        fcChip->SEST->u[ x_ID].IWE.Hdr_Len |= 0x80000000; // set VAL bit
      }
    } 
  }

  if( TachFroze) 
  { 
    fcChip->UnFreezeTachyon( fcChip, 2);  // both ERQ and FCP assists
  }
} 


// Complete an Linux Cmnds that we Queued because
// our FC link was down (cause immediate retry)

static void UnblockScsiDevice( struct Scsi_Host *HostAdapter, 
		        PFC_LOGGEDIN_PORT pLoggedInPort)
{
  CPQFCHBA *cpqfcHBAdata = (CPQFCHBA *)HostAdapter->hostdata;
  Scsi_Cmnd* *SCptr = &cpqfcHBAdata->LinkDnCmnd[0];
  Scsi_Cmnd *Cmnd;
  int indx;

 
  
  // if the device was previously "blocked", make sure
  // we unblock it so Linux SCSI will resume

  pLoggedInPort->device_blocked = FALSE; // clear our flag

  // check the Link Down command ptr buffer;
  // we can complete now causing immediate retry
  for( indx=0; indx < CPQFCTS_REQ_QUEUE_LEN; indx++, SCptr++)
  {
    if( *SCptr != NULL ) // scsi command to complete?
    {
#ifdef DUMMYCMND_DBG
      printk("complete Cmnd %p in LinkDnCmnd[%d]\n", *SCptr,indx);
#endif
      Cmnd = *SCptr;


      // Are there any Q'd commands for this target?
      if( (Cmnd->device->id == pLoggedInPort->ScsiNexus.target)
	       &&
          (Cmnd->device->channel == pLoggedInPort->ScsiNexus.channel) )
      {
        Cmnd->result = (DID_SOFT_ERROR <<16); // force retry
        if( Cmnd->scsi_done == NULL) 
	{
          printk("LinkDnCmnd scsi_done ptr null, port_id %Xh\n",
		  pLoggedInPort->port_id);
	}
	else
	  call_scsi_done(Cmnd);
        *SCptr = NULL;  // free this slot for next use
      }
    }
  }
}

  
//#define WWN_DBG 1

static void SetLoginFields(
  PFC_LOGGEDIN_PORT pLoggedInPort,
  TachFCHDR_GCMND* fchs,
  BOOLEAN PDisc,
  BOOLEAN Originator)
{
  LOGIN_PAYLOAD logi;       // FC-PH Port Login
  PRLI_REQUEST prli;  // copy for BIG ENDIAN switch
  int i;
#ifdef WWN_DBG
  ULONG ulBuff;
#endif

  BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&logi, sizeof(logi));

  pLoggedInPort->Originator = Originator;
  pLoggedInPort->port_id = fchs->s_id & 0xFFFFFF;
  
  switch( fchs->pl[0] & 0xffff )
  {
  case 0x00000002:  //  PLOGI or PDISC ACCept?
    if( PDisc )     // PDISC accept
      goto PDISC_case;

  case 0x00000003:  //  ELS_PLOGI or ELS_PLOGI_ACC

  // Login BB_credit typically 0 for Tachyons
    pLoggedInPort->BB_credit = logi.cmn_services.bb_credit;

    // e.g. 128, 256, 1024, 2048 per FC-PH spec
    // We have to use this when setting up SEST Writes,
    // since that determines frame size we send.
    pLoggedInPort->rx_data_size = logi.class3.rx_data_size;
    pLoggedInPort->plogi = TRUE;
    pLoggedInPort->pdisc = FALSE;
    pLoggedInPort->prli = FALSE;    // ELS_PLOGI resets
    pLoggedInPort->flogi = FALSE;   // ELS_PLOGI resets
    pLoggedInPort->logo = FALSE;    // ELS_PLOGI resets
    pLoggedInPort->LOGO_counter = 0;// ELS_PLOGI resets
    pLoggedInPort->LOGO_timer = 0;// ELS_PLOGI resets

    // was this PLOGI to a Fabric?
    if( pLoggedInPort->port_id == 0xFFFFFC ) // well know address
      pLoggedInPort->flogi = TRUE;


    for( i=0; i<8; i++)   // copy the LOGIN port's WWN
      pLoggedInPort->u.ucWWN[i] = logi.port_name[i];  

#ifdef WWN_DBG
    ulBuff = (ULONG)pLoggedInPort->u.liWWN;
    if( pLoggedInPort->Originator)
      printk("o");
    else
      printk("r");
    printk("PLOGI port_id %Xh, WWN %08X",
      pLoggedInPort->port_id, ulBuff);

    ulBuff = (ULONG)(pLoggedInPort->u.liWWN >> 32);
    printk("%08Xh fcPort %p\n", ulBuff, pLoggedInPort);
#endif
    break;



  
  case 0x00000005:  //  ELS_LOGO (logout)


    pLoggedInPort->plogi = FALSE;
    pLoggedInPort->pdisc = FALSE;
    pLoggedInPort->prli = FALSE;   // ELS_PLOGI resets
    pLoggedInPort->flogi = FALSE;  // ELS_PLOGI resets
    pLoggedInPort->logo = TRUE;    // ELS_PLOGI resets
    pLoggedInPort->LOGO_counter++; // ELS_PLOGI resets
    pLoggedInPort->LOGO_timer = 0;
#ifdef WWN_DBG
    ulBuff = (ULONG)pLoggedInPort->u.liWWN;
    if( pLoggedInPort->Originator)
      printk("o");
    else
      printk("r");
    printk("LOGO port_id %Xh, WWN %08X",
      pLoggedInPort->port_id, ulBuff);

    ulBuff = (ULONG)(pLoggedInPort->u.liWWN >> 32);
    printk("%08Xh\n", ulBuff);
#endif
    break;



PDISC_case:
  case 0x00000050: //  ELS_PDISC or ELS_PDISC_ACC
    pLoggedInPort->LOGO_timer = 0;  // stop the time-out
      
    pLoggedInPort->prli = TRUE;     // ready to accept FCP-SCSI I/O
    

      
#ifdef WWN_DBG
    ulBuff = (ULONG)pLoggedInPort->u.liWWN;
    if( pLoggedInPort->Originator)
      printk("o");
    else
      printk("r");
    printk("PDISC port_id %Xh, WWN %08X",
      pLoggedInPort->port_id, ulBuff);

    ulBuff = (ULONG)(pLoggedInPort->u.liWWN >> 32);
    printk("%08Xh\n", ulBuff);
#endif


    
    break;


    
  case  0x1020L: //  PRLI?
  case  0x1002L: //  PRLI ACCept?
    BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&prli, sizeof(prli));

    pLoggedInPort->fcp_info = prli.fcp_info; // target/initiator flags
    pLoggedInPort->prli = TRUE;  // PLOGI resets, PDISC doesn't

    pLoggedInPort->pdisc = TRUE;  // expect to send (or receive) PDISC
                                  // next time
    pLoggedInPort->LOGO_timer = 0;  // will be set next LinkDown
#ifdef WWN_DBG
    ulBuff = (ULONG)pLoggedInPort->u.liWWN;
    if( pLoggedInPort->Originator)
      printk("o");
    else
      printk("r");
    printk("PRLI port_id %Xh, WWN %08X",
      pLoggedInPort->port_id, ulBuff);

    ulBuff = (ULONG)(pLoggedInPort->u.liWWN >> 32);
      printk("%08Xh\n", ulBuff);
#endif

    break;

  }

  return;
}






static void BuildLinkServicePayload( PTACHYON fcChip, ULONG type, void* payload)
{
  LOGIN_PAYLOAD *plogi;  // FC-PH Port Login
  LOGIN_PAYLOAD PlogiPayload;   // copy for BIG ENDIAN switch
  PRLI_REQUEST  *prli;          // FCP-SCSI Process Login
  PRLI_REQUEST  PrliPayload;    // copy for BIG ENDIAN switch
  LOGOUT_PAYLOAD  *logo;
  LOGOUT_PAYLOAD  LogoutPayload;
//  PRLO_REQUEST  *prlo;
//  PRLO_REQUEST  PrloPayload;
  REJECT_MESSAGE rjt, *prjt;

  memset( &PlogiPayload, 0, sizeof( PlogiPayload));
  plogi = &PlogiPayload;    // load into stack buffer,
                                // then BIG-ENDIAN switch a copy to caller


  switch( type )  // payload type can be ELS_PLOGI, ELS_PRLI, ADISC, ...
  {
    case ELS_FDISC:
    case ELS_FLOGI:
    case ELS_PLOGI_ACC:   // FC-PH PORT Login Accept
    case ELS_PLOGI:   // FC-PH PORT Login
    case ELS_PDISC:   // FC-PH2 Port Discovery - same payload as ELS_PLOGI
      plogi->login_cmd = LS_PLOGI;
      if( type == ELS_PDISC)
        plogi->login_cmd = LS_PDISC;
      else if( type == ELS_PLOGI_ACC )
        plogi->login_cmd = LS_ACC;

      plogi->cmn_services.bb_credit = 0x00;
      plogi->cmn_services.lowest_ver = fcChip->lowest_FCPH_ver;
      plogi->cmn_services.highest_ver = fcChip->highest_FCPH_ver;
      plogi->cmn_services.bb_rx_size = TACHLITE_TS_RX_SIZE;
      plogi->cmn_services.common_features = CONTINUOSLY_INCREASING |
              RANDOM_RELATIVE_OFFSET;

             // fill in with World Wide Name based Port Name - 8 UCHARs
             // get from Tach registers WWN hi & lo
      LoadWWN( fcChip, plogi->port_name, 0);
             // fill in with World Wide Name based Node/Fabric Name - 8 UCHARs
             // get from Tach registers WWN hi & lo
      LoadWWN( fcChip, plogi->node_name, 1);

	// For Seagate Drives.
	//
      plogi->cmn_services.common_features |= 0x800;
      plogi->cmn_services.rel_offset = 0xFE;
      plogi->cmn_services.concurrent_seq = 1;
      plogi->class1.service_options = 0x00;
      plogi->class2.service_options = 0x00;
      plogi->class3.service_options = CLASS_VALID;
      plogi->class3.initiator_control = 0x00;
      plogi->class3.rx_data_size = MAX_RX_PAYLOAD;
      plogi->class3.recipient_control =
             ERROR_DISCARD | ONE_CATEGORY_SEQUENCE;
      plogi->class3.concurrent_sequences = 1;
      plogi->class3.open_sequences = 1;
      plogi->vendor_id[0] = 'C'; plogi->vendor_id[1] = 'Q';
      plogi->vendor_version[0] = 'C'; plogi->vendor_version[1] = 'Q';
      plogi->vendor_version[2] = ' '; plogi->vendor_version[3] = '0';
      plogi->vendor_version[4] = '0'; plogi->vendor_version[5] = '0';


      // FLOGI specific fields... (see FC-FLA, Rev 2.7, Aug 1999, sec 5.1)
      if( (type == ELS_FLOGI) || (type == ELS_FDISC) )
      {
        if( type == ELS_FLOGI )
  	  plogi->login_cmd = LS_FLOGI;  
	else
  	  plogi->login_cmd = LS_FDISC;  

        plogi->cmn_services.lowest_ver = 0x20;
        plogi->cmn_services.common_features = 0x0800;
        plogi->cmn_services.rel_offset = 0;
        plogi->cmn_services.concurrent_seq = 0;

        plogi->class3.service_options = 0x8800;
        plogi->class3.rx_data_size = 0;
        plogi->class3.recipient_control = 0;
        plogi->class3.concurrent_sequences = 0;
        plogi->class3.open_sequences = 0;
      }
      
              // copy back to caller's buff, w/ BIG ENDIAN swap
      BigEndianSwap( (UCHAR*)&PlogiPayload, payload,  sizeof(PlogiPayload));
      break;

    
    case ELS_ACC:       // generic Extended Link Service ACCept	    
      plogi->login_cmd = LS_ACC;
              // copy back to caller's buff, w/ BIG ENDIAN swap
      BigEndianSwap( (UCHAR*)&PlogiPayload, payload,  4);
      break;


      
    case ELS_SCR:    // Fabric State Change Registration
    {
      SCR_PL scr;     // state change registration

      memset( &scr, 0, sizeof(scr));

      scr.command = LS_SCR;  // 0x62000000
                             // see FC-FLA, Rev 2.7, Table A.22 (pg 82)
      scr.function = 3;      // 1 = Events detected by Fabric
                             // 2 = N_Port detected registration
                             // 3 = Full registration
      
      // copy back to caller's buff, w/ BIG ENDIAN swap
      BigEndianSwap( (UCHAR*)&scr, payload,  sizeof(SCR_PL));
    }
    
    break;

    
    case FCS_NSR:    // Fabric Name Service Request
    {
      NSR_PL nsr;    // Name Server Req. payload

      memset( &nsr, 0, sizeof(NSR_PL));

                             // see Brocade Fabric Programming Guide,
                             // Rev 1.3, pg 4-44
      nsr.CT_Rev = 0x01000000;
      nsr.FCS_Type = 0xFC020000;
      nsr.Command_code = 0x01710000;
      nsr.FCP = 8;
     
      // copy back to caller's buff, w/ BIG ENDIAN swap
      BigEndianSwap( (UCHAR*)&nsr, payload,  sizeof(NSR_PL));
    }
    
    break;



    
    case ELS_LOGO:   // FC-PH PORT LogOut
      logo = &LogoutPayload;    // load into stack buffer,
                                // then BIG-ENDIAN switch a copy to caller
      logo->cmd = LS_LOGO;
                                // load the 3 UCHARs of the node name
                                // (if private loop, upper two UCHARs 0)
      logo->reserved = 0;

      logo->n_port_identifier[0] = (UCHAR)(fcChip->Registers.my_al_pa);
      logo->n_port_identifier[1] =
                     (UCHAR)(fcChip->Registers.my_al_pa>>8);
      logo->n_port_identifier[2] =
                     (UCHAR)(fcChip->Registers.my_al_pa>>16);
             // fill in with World Wide Name based Port Name - 8 UCHARs
             // get from Tach registers WWN hi & lo
      LoadWWN( fcChip, logo->port_name, 0);

      BigEndianSwap( (UCHAR*)&LogoutPayload,
                     payload,  sizeof(LogoutPayload) );  // 16 UCHAR struct
      break;


    case ELS_LOGO_ACC:     // Logout Accept (FH-PH pg 149, table 74)
      logo = &LogoutPayload;    // load into stack buffer,
                                // then BIG-ENDIAN switch a copy to caller
      logo->cmd = LS_ACC;
      BigEndianSwap( (UCHAR*)&LogoutPayload, payload, 4 );  // 4 UCHAR cmnd
      break;
      

    case ELS_RJT:          // ELS_RJT link service reject (FH-PH pg 155)

      prjt = (REJECT_MESSAGE*)payload;  // pick up passed data
      rjt.command_code = ELS_RJT;
                       // reverse fields, because of Swap that follows...
      rjt.vendor = prjt->reserved; // vendor specific
      rjt.explain = prjt->reason; //
      rjt.reason = prjt->explain; //
      rjt.reserved = prjt->vendor; //
                       // BIG-ENDIAN switch a copy to caller
      BigEndianSwap( (UCHAR*)&rjt, payload, 8 );  // 8 UCHAR cmnd
      break;





    case ELS_PRLI_ACC:  // Process Login ACCept
    case ELS_PRLI:  // Process Login
    case ELS_PRLO:  // Process Logout
      memset( &PrliPayload, 0, sizeof( PrliPayload));
      prli = &PrliPayload;      // load into stack buffer,

      if( type == ELS_PRLI )
        prli->cmd = 0x20;  // Login
      else if( type == ELS_PRLO )
        prli->cmd = 0x21;  // Logout
      else if( type == ELS_PRLI_ACC )
      {
        prli->cmd = 0x02;  // Login ACCept
        prli->valid = REQUEST_EXECUTED;
      }


      prli->valid |= SCSI_FCP | ESTABLISH_PAIR;
      prli->fcp_info = READ_XFER_RDY;
      prli->page_length = 0x10;
      prli->payload_length = 20;
                                // Can be initiator AND target

      if( fcChip->Options.initiator )
        prli->fcp_info |= INITIATOR_FUNCTION;
      if( fcChip->Options.target )
        prli->fcp_info |= TARGET_FUNCTION;

      BigEndianSwap( (UCHAR*)&PrliPayload, payload,  prli->payload_length);
      break;



    default:  // no can do - programming error
      printk(" BuildLinkServicePayload unknown!\n");
      break;
  }
}

// loads 8 UCHARs for PORT name or NODE name base on
// controller's WWN.
void LoadWWN( PTACHYON fcChip, UCHAR* dest, UCHAR type)
{
  UCHAR* bPtr, i;

  switch( type )
  {
    case 0:  // Port_Name
      bPtr = (UCHAR*)&fcChip->Registers.wwn_hi;
      for( i =0; i<4; i++)
        dest[i] = *bPtr++;
      bPtr = (UCHAR*)&fcChip->Registers.wwn_lo;
      for( i =4; i<8; i++)
        dest[i] = *bPtr++;
      break;
    case 1:  // Node/Fabric _Name
      bPtr = (UCHAR*)&fcChip->Registers.wwn_hi;
      for( i =0; i<4; i++)
        dest[i] = *bPtr++;
      bPtr = (UCHAR*)&fcChip->Registers.wwn_lo;
      for( i =4; i<8; i++)
        dest[i] = *bPtr++;
      break;
  }
  
}



// We check the Port Login payload for required values.  Note that
// ELS_PLOGI and ELS_PDISC (Port DISCover) use the same payload.


int verify_PLOGI( PTACHYON fcChip,
                  TachFCHDR_GCMND* fchs, 
                  ULONG* reject_explain)
{
  LOGIN_PAYLOAD	login;

                  // source, dest, len (should be mult. of 4)
  BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&login,  sizeof(login));

                            // check FC version
                            // if other port's highest supported version
                            // is less than our lowest, and 
                            // if other port's lowest
  if( login.cmn_services.highest_ver < fcChip->lowest_FCPH_ver ||
      login.cmn_services.lowest_ver > fcChip->highest_FCPH_ver )
  {
    *reject_explain = LS_RJT_REASON( LOGICAL_ERROR, OPTIONS_ERROR);
    return LOGICAL_ERROR;
  }

                            // Receive Data Field Size must be >=128
                            // per FC-PH
  if (login.cmn_services.bb_rx_size < 128)
  {
    *reject_explain = LS_RJT_REASON( LOGICAL_ERROR, DATA_FIELD_SIZE_ERROR);
    return LOGICAL_ERROR;
  }

                            // Only check Class 3 params
  if( login.class3.service_options & CLASS_VALID)
  {
    if (login.class3.rx_data_size < 128)
    {
      *reject_explain = LS_RJT_REASON( LOGICAL_ERROR, INVALID_CSP);
      return LOGICAL_ERROR;
    }
    if( login.class3.initiator_control & XID_REQUIRED)
    {
      *reject_explain = LS_RJT_REASON( LOGICAL_ERROR, INITIATOR_CTL_ERROR);
      return LOGICAL_ERROR;
    }
  }
  return 0;   // success
}




int verify_PRLI( TachFCHDR_GCMND* fchs, ULONG* reject_explain)
{
  PRLI_REQUEST prli;  // buffer for BIG ENDIAN

                  // source, dest, len (should be mult. of 4)
  BigEndianSwap( (UCHAR*)&fchs->pl[0], (UCHAR*)&prli,  sizeof(prli));

  if( prli.fcp_info == 0 )  // i.e., not target or initiator?
  {
    *reject_explain = LS_RJT_REASON( LOGICAL_ERROR, OPTIONS_ERROR);
    return LOGICAL_ERROR;
  }

  return 0;  // success
}


// SWAP UCHARs as required by Fibre Channel (i.e. BIG ENDIAN)
// INPUTS:
//   source   - ptr to LITTLE ENDIAN ULONGS
//   cnt      - number of UCHARs to switch (should be mult. of ULONG)
// OUTPUTS:
//   dest     - ptr to BIG ENDIAN copy
// RETURN:
//   none
//
void BigEndianSwap( UCHAR *source, UCHAR *dest,  USHORT cnt)
{
  int i,j;

  source+=3;   // start at MSB of 1st ULONG
  for( j=0; j < cnt; j+=4, source+=4, dest+=4)  // every ULONG
  {
    for( i=0; i<4; i++)  // every UCHAR in ULONG
          *(dest+i) = *(source-i);
  }
}




// Build FC Exchanges............

static void  buildFCPstatus( 
  PTACHYON fcChip, 
  ULONG ExchangeID);

static LONG FindFreeExchange( PTACHYON fcChip, ULONG type );

static ULONG build_SEST_sgList( 
  struct pci_dev *pcidev,
  ULONG *SESTalPairStart,
  Scsi_Cmnd *Cmnd,
  ULONG *sgPairs,
  PSGPAGES *sgPages_head  // link list of TL Ext. S/G pages from O/S Pool
);

static int build_FCP_payload( Scsi_Cmnd *Cmnd, 
  UCHAR* payload, ULONG type, ULONG fcp_dl );


/*
                             IRB
      ERQ           __________________
  |          |   / | Req_A_SFS_Len    |        ____________________
  |----------|  /  | Req_A_SFS_Addr   |------->|  Reserved         |
  |   IRB    | /   | Req_A_D_ID       |        | SOF EOF TimeStamp |
  |-----------/    | Req_A_SEST_Index |-+      | R_CTL |   D_ID    |
  |   IRB    |     | Req_B...         | |      | CS_CTL|   S_ID    | 
  |-----------\    |                  | |      | TYPE  |   F_CTL   |
  |   IRB    | \   |                  | |      | SEQ_ID  | SEQ_CNT |
  |-----------  \  |                  | +-->+--| OX_ID   | RX_ID   |
  |          |   \ |__________________|     |  |       RO          |
                                            |  | pl (payload/cmnd) |
                                            |  |        .....      |
                                            |  |___________________|
                                            |
                                            |
+-------------------------------------------+
|
|
|                        e.g. IWE    
|    SEST           __________________             for FCP_DATA
| |          |   / |       | Hdr_Len  |        ____________________
| |----------|  /  |  Hdr_Addr_Addr   |------->|  Reserved         |
| |   [0]    | /   |Remote_ID| RSP_Len|        | SOF EOF TimeStamp |
| |-----------/    |   RSP_Addr       |---+    | R_CTL |   D_ID    |
+->   [1]    |     |       | Buff_Off |   |    | CS_CTL|   S_ID    | 
  |-----------\    |BuffIndex| Link   |   |    | TYPE  |   F_CTL   |
  |   [2]    | \   | Rsvd  |   RX_ID  |   |    | SEQ_ID  | SEQ_CNT |
  |-----------  \  |    Data_Len      |   |    | OX_ID   | RX_ID   |
  |    ...   |   \ |     Exp_RO       |   |    |       RO          |
  |----------|     |   Exp_Byte_Cnt   |   |    |___________________|
  | SEST_LEN |  +--|    Len           |   |                                             
  |__________|  |  |   Address        |   |                                              
                |  |    ...           |   |         for FCP_RSP  
                |  |__________________|   |    ____________________
                |                         +----|  Reserved         |   
                |                              | SOF EOF TimeStamp |
                |                              | R_CTL |   D_ID    |
                |                              | CS_CTL|   S_ID    | 
                +--- local or extended         |     ....          |
                     scatter/gather lists
                     defining upper-layer
                     data (e.g. from user's App)


*/
// All TachLite commands must start with a SFS (Single Frame Sequence)
// command.  In the simplest case (a NOP Basic Link command),
// only one frame header and ERQ entry is required.  The most complex
// case is the SCSI assisted command, which requires an ERQ entry,
// SEST entry, and several frame headers and data buffers all
// logically linked together.
// Inputs:
//   cpqfcHBAdata  - controller struct
//   type          - PLOGI, SCSI_IWE, etc.
//   InFCHS        - Incoming Tachlite FCHS which prompted this exchange
//                   (only s_id set if we are originating)
//   Data          - PVOID to data struct consistent with "type"
//   fcExchangeIndex - pointer to OX/RD ID value of built exchange
// Return:
//   fcExchangeIndex - OX/RD ID value if successful
//   0    - success
//  INVALID_ARGS    - NULL/ invalid passed args
//  BAD_ALPA        - Bad source al_pa address
//  LNKDWN_OSLS     - Link Down (according to this controller)
//  OUTQUE_FULL     - Outbound Que full
//  DRIVERQ_FULL    - controller's Exchange array full
//  SEST_FULL       - SEST table full
//
// Remarks:
// Psuedo code:
// Check for NULL pointers / bad args
// Build outgoing FCHS - the header/payload struct
// Build IRB (for ERQ entry)
// if SCSI command, build SEST entry (e.g. IWE, TRE,...)
// return success

//sbuildex
ULONG cpqfcTSBuildExchange(
  CPQFCHBA *cpqfcHBAdata,
  ULONG type, // e.g. PLOGI
  TachFCHDR_GCMND* InFCHS,  // incoming FCHS
  void *Data,               // the CDB, scatter/gather, etc.  
  LONG *fcExchangeIndex )   // points to allocated exchange, 
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG ulStatus = 0;  // assume OK
  USHORT ox_ID, rx_ID=0xFFFF;
  ULONG SfsLen=0L;
  TachLiteIRB* pIRB;
  IRBflags IRB_flags;
  UCHAR *pIRB_flags = (UCHAR*)&IRB_flags;
  TachFCHDR_GCMND* CMDfchs;
  TachFCHDR* dataHDR;     // 32 byte HEADER ONLY FCP-DATA buffer
  TachFCHDR_RSP* rspHDR;     // 32 byte header + RSP payload
  Scsi_Cmnd *Cmnd = (Scsi_Cmnd*)Data;   // Linux Scsi CDB, S/G, ...
  TachLiteIWE* pIWE;
  TachLiteIRE* pIRE;
  TachLiteTWE* pTWE;
  TachLiteTRE* pTRE;
  ULONG fcp_dl;           // total byte length of DATA transferred
  ULONG fl;               // frame length (FC frame size, 128, 256, 512, 1024)
  ULONG sgPairs;          // number of valid scatter/gather pairs
  int FCP_SCSI_command;
  BA_ACC_PAYLOAD *ba_acc;
  BA_RJT_PAYLOAD *ba_rjt;

                          // check passed ARGS
  if( !fcChip->ERQ )      // NULL ptr means uninitialized Tachlite chip
    return INVALID_ARGS;


  if( type == SCSI_IRE ||
      type == SCSI_TRE ||
      type == SCSI_IWE ||
      type == SCSI_TWE)
    FCP_SCSI_command = 1;

  else
    FCP_SCSI_command = 0;


                     // for commands that pass payload data (e.g. SCSI write)
                     // examine command struct - verify that the
                     // length of s/g buffers is adequate for total payload
                     // length (end of list is NULL address)

  if( FCP_SCSI_command )
  {
    if( Data )     // must have data descriptor (S/G list -- at least
                   // one address with at least 1 byte of data)
    {
      // something to do (later)?
    }

    else
      return INVALID_ARGS;  // invalid DATA ptr
  }

    

         // we can build an Exchange for later Queuing (on the TL chip)
         // if an empty slot is available in the DevExt for this controller
         // look for available Exchange slot...

  if( type != FCP_RESPONSE &&
      type != BLS_ABTS &&
      type != BLS_ABTS_ACC )  // already have Exchange slot!
    *fcExchangeIndex = FindFreeExchange( fcChip, type );

  if( *fcExchangeIndex != -1 )   // Exchange is available?
  {
                     // assign tmp ptr (shorthand)
    CMDfchs = &Exchanges->fcExchange[ *fcExchangeIndex].fchs; 

    if( Cmnd != NULL ) // (necessary for ABTS cases)
    {
      Exchanges->fcExchange[ *fcExchangeIndex].Cmnd = Cmnd; // Linux Scsi
      Exchanges->fcExchange[ *fcExchangeIndex].pLoggedInPort = 
	fcFindLoggedInPort( fcChip,
          Exchanges->fcExchange[ *fcExchangeIndex].Cmnd, // find Scsi Nexus
          0,        // DON'T search linked list for FC port id
	  NULL,     // DON'T search linked list for FC WWN
          NULL);    // DON'T care about end of list

    }


                     // Build the command frame header (& data) according
                     // to command type

                     // fields common for all SFS frame types
    CMDfchs->reserved = 0L; // must clear
    CMDfchs->sof_eof = 0x75000000L;  // SOFi3:EOFn  no UAM; LCr=0, no TS
    
             // get the destination port_id from incoming FCHS
             // (initialized before calling if we're Originator)
             // Frame goes to port it was from - the source_id
    
    CMDfchs->d_id = InFCHS->s_id &0xFFFFFF; // destination (add R_CTL later)
    CMDfchs->s_id = fcChip->Registers.my_al_pa; // CS_CTL = 0


    // now enter command-specific fields
    switch( type )
    {

    case BLS_NOP:   // FC defined basic link service command NO-OP
                // ensure unique X_IDs! (use tracking function)

      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (not SEST index)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += 32L;        // add len to LSB (header only - no payload)

                   // TYPE[31-24] 00 Basic Link Service
                   // f_ctl[23:0] exchg originator, 1st seq, xfer S.I.
      CMDfchs->d_id |= 0x80000000L;  // R_CTL = 80 for NOP (Basic Link Ser.)
      CMDfchs->f_ctl = 0x00310000L;  // xchng originator, 1st seq,....
      CMDfchs->seq_cnt = 0x0L;
      CMDfchs->ox_rx_id = 0xFFFF;        // RX_ID for now; OX_ID on start
      CMDfchs->ro = 0x0L;    // relative offset (n/a)
      CMDfchs->pl[0] = 0xaabbccddL;   // words 8-15 frame data payload (n/a)
      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 1; // seconds
                                      // (NOP should complete ~instantly)
      break;


    
    
    case BLS_ABTS_ACC:  // Abort Sequence ACCept
      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (not SEST index)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += 32 + 12;    // add len to LSB (header + 3 DWORD payload)

      CMDfchs->d_id |= 0x84000000L;  // R_CTL = 84 for BASIC ACCept
                   // TYPE[31-24] 00 Basic Link Service
                   // f_ctl[23:0] exchg originator, not 1st seq, xfer S.I.
      CMDfchs->f_ctl = 0x00910000L;  // xchnge responder, last seq, xfer SI
                   // CMDfchs->seq_id & count might be set from DataHdr?
      CMDfchs->ro = 0x0L;    // relative offset (n/a)
      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 5; // seconds
                        // (Timeout in case of weird error)
      
      // now set the ACCept payload...
      ba_acc = (BA_ACC_PAYLOAD*)&CMDfchs->pl[0];
      memset( ba_acc, 0, sizeof( BA_ACC_PAYLOAD));
      // Since PLDA requires (only) entire Exchange aborts, we don't need
      // to worry about what the last sequence was.

      // We expect that a "target" task is accepting the abort, so we
      // can use the OX/RX ID pair 
      ba_acc->ox_rx_id = CMDfchs->ox_rx_id;
 
      // source, dest, #bytes
      BigEndianSwap((UCHAR *)&CMDfchs->ox_rx_id, (UCHAR *)&ba_acc->ox_rx_id, 4);

      ba_acc->low_seq_cnt = 0;
      ba_acc->high_seq_cnt = 0xFFFF;


      break;
    

    case BLS_ABTS_RJT:  // Abort Sequence ACCept
      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (not SEST index)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += 32 + 12;    // add len to LSB (header + 3 DWORD payload)

      CMDfchs->d_id |= 0x85000000L;  // R_CTL = 85 for BASIC ReJecT
                   // f_ctl[23:0] exchg originator, not 1st seq, xfer S.I.
                   // TYPE[31-24] 00 Basic Link Service
      CMDfchs->f_ctl = 0x00910000L;  // xchnge responder, last seq, xfer SI
                   // CMDfchs->seq_id & count might be set from DataHdr?
      CMDfchs->ro = 0x0L;    // relative offset (n/a)
      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 5; // seconds
                        // (Timeout in case of weird error)
      
      CMDfchs->ox_rx_id = InFCHS->ox_rx_id; // copy from sender!
      
      // now set the ReJecT payload...
      ba_rjt = (BA_RJT_PAYLOAD*)&CMDfchs->pl[0];
      memset( ba_rjt, 0, sizeof( BA_RJT_PAYLOAD));

      // We expect that a "target" task couldn't find the Exhange in the
      // array of active exchanges, so we use a new LinkService X_ID.
      // See Reject payload description in FC-PH (Rev 4.3), pg. 140
      ba_rjt->reason_code = 0x09; // "unable to perform command request"
      ba_rjt->reason_explain = 0x03; // invalid OX/RX ID pair


      break;
    
    
    case BLS_ABTS:   // FC defined basic link service command ABTS 
                     // Abort Sequence
                     

      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (not SEST index)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += 32L;        // add len to LSB (header only - no payload)

                   // TYPE[31-24] 00 Basic Link Service
                   // f_ctl[23:0] exchg originator, not 1st seq, xfer S.I.
      CMDfchs->d_id |= 0x81000000L;  // R_CTL = 81 for ABTS
      CMDfchs->f_ctl = 0x00110000L;  // xchnge originator, last seq, xfer SI
                   // CMDfchs->seq_id & count might be set from DataHdr?
      CMDfchs->ro = 0x0L;    // relative offset (n/a)
      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 2; // seconds
                        // (ABTS must timeout when responder is gone)
      break;

    
    
    case FCS_NSR:    // Fabric Name Service Request
       Exchanges->fcExchange[ *fcExchangeIndex].reTries = 2;


      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 2; // seconds
                         // OX_ID, linked to Driver Transaction ID
                         // (fix-up at Queing time)
      CMDfchs->ox_rx_id = 0xFFFF; // RX_ID - Responder (target) to modify
                                    // OX_ID set at ERQueing time
      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (not SEST index)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += (32L + sizeof(NSR_PL)); // add len (header & NSR payload)

      CMDfchs->d_id |= 0x02000000L;  // R_CTL = 02 for -
                                   // Name Service Request: Unsolicited 
                   // TYPE[31-24] 01 Extended Link Service
                   // f_ctl[23:0] exchg originator, 1st seq, xfer S.I.
      CMDfchs->f_ctl = 0x20210000L;
                   // OX_ID will be fixed-up at Tachyon enqueing time
      CMDfchs->seq_cnt = 0; // seq ID, DF_ctl, seq cnt
      CMDfchs->ro = 0x0L;    // relative offset (n/a)

      BuildLinkServicePayload( fcChip, type, &CMDfchs->pl[0]);

   
    
    
    
    
      break;
    
    
    
    
    case ELS_PLOGI:  // FC-PH extended link service command Port Login
      // (May, 2000)
      // NOTE! This special case facilitates SANMark testing.  The SANMark
      // test script for initialization-timeout.fcal.SANMark-1.fc
      // "eats" the OPN() primitive without issuing an R_RDY, causing
      // Tachyon to report LST (loop state timeout), which causes a
      // LIP.  To avoid this, simply send out the frame (i.e. assuming a
      // buffer credit of 1) without waiting for R_RDY.  Many FC devices
      // (other than Tachyon) have been doing this for years.  We don't
      // ever want to do this for non-Link Service frames unless the
      // other device really did report non-zero login BB credit (i.e.
      // in the PLOGI ACCept frame).
//      CMDfchs->sof_eof |= 0x00000400L;  // LCr=1
    
    case ELS_FDISC:  // Fabric Discovery (Login)
    case ELS_FLOGI:  // Fabric Login
    case ELS_SCR:    // Fabric State Change Registration
    case ELS_LOGO:   // FC-PH extended link service command Port Logout
    case ELS_PDISC:  // FC-PH extended link service cmnd Port Discovery
    case ELS_PRLI:   // FC-PH extended link service cmnd Process Login

      Exchanges->fcExchange[ *fcExchangeIndex].reTries = 2;


      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 2; // seconds
                         // OX_ID, linked to Driver Transaction ID
                         // (fix-up at Queing time)
      CMDfchs->ox_rx_id = 0xFFFF; // RX_ID - Responder (target) to modify
                                    // OX_ID set at ERQueing time
      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (not SEST index)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      if( type == ELS_LOGO )
        SfsLen += (32L + 16L); //  add len (header & PLOGI payload)
      else if( type == ELS_PRLI )
        SfsLen += (32L + 20L); //  add len (header & PRLI payload)
      else if( type == ELS_SCR )
        SfsLen += (32L + sizeof(SCR_PL)); //  add len (header & SCR payload)
      else
        SfsLen += (32L + 116L); //  add len (header & PLOGI payload)

      CMDfchs->d_id |= 0x22000000L;  // R_CTL = 22 for -
                                   // Extended Link_Data: Unsolicited Control
                   // TYPE[31-24] 01 Extended Link Service
                   // f_ctl[23:0] exchg originator, 1st seq, xfer S.I.
      CMDfchs->f_ctl = 0x01210000L;
                   // OX_ID will be fixed-up at Tachyon enqueing time
      CMDfchs->seq_cnt = 0; // seq ID, DF_ctl, seq cnt
      CMDfchs->ro = 0x0L;    // relative offset (n/a)

      BuildLinkServicePayload( fcChip, type, &CMDfchs->pl[0]);

      break;



    case ELS_LOGO_ACC: // FC-PH extended link service logout accept
    case ELS_RJT:          // extended link service reject (add reason)
    case ELS_ACC:      // ext. link service generic accept
    case ELS_PLOGI_ACC:// ext. link service login accept (PLOGI or PDISC)
    case ELS_PRLI_ACC: // ext. link service process login accept


      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 1; // assume done
                // ensure unique X_IDs! (use tracking function)
                // OX_ID from initiator cmd
      ox_ID = (USHORT)(InFCHS->ox_rx_id >> 16); 
      rx_ID = 0xFFFF; // RX_ID, linked to Driver Exchange ID

      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (not SEST index)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      if( type == ELS_RJT )
      {
        SfsLen += (32L + 8L); //  add len (header + payload)

        // ELS_RJT reason codes (utilize unused "reserved" field)
        CMDfchs->pl[0] = 1;
        CMDfchs->pl[1] = InFCHS->reserved;  
          
      }
      else if( (type == ELS_LOGO_ACC) || (type == ELS_ACC)  )
        SfsLen += (32L + 4L); //  add len (header + payload)
      else if( type == ELS_PLOGI_ACC )
        SfsLen += (32L + 116L); //  add len (header + payload)
      else if( type == ELS_PRLI_ACC )
        SfsLen += (32L + 20L); //  add len (header + payload)

      CMDfchs->d_id |= 0x23000000L;  // R_CTL = 23 for -
                                   // Extended Link_Data: Control Reply
                   // TYPE[31-24] 01 Extended Link Service
                   // f_ctl[23:0] exchg responder, last seq, e_s, tsi
      CMDfchs->f_ctl = 0x01990000L;
      CMDfchs->seq_cnt = 0x0L;
      CMDfchs->ox_rx_id = 0L;        // clear
      CMDfchs->ox_rx_id = ox_ID; // load upper 16 bits
      CMDfchs->ox_rx_id <<= 16;      // shift them

      CMDfchs->ro = 0x0L;    // relative offset (n/a)

      BuildLinkServicePayload( fcChip, type, &CMDfchs->pl[0]);

      break;


                         // Fibre Channel SCSI 'originator' sequences...
                         // (originator means 'initiator' in FCP-SCSI)

    case SCSI_IWE: // TachLite Initiator Write Entry
    {
      PFC_LOGGEDIN_PORT pLoggedInPort = 
        Exchanges->fcExchange[ *fcExchangeIndex].pLoggedInPort;

      Exchanges->fcExchange[ *fcExchangeIndex].reTries = 1;
      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 7; // FC2 timeout
                       
      // first, build FCP_CMND
      // unique X_ID fix-ups in StartExchange 

      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS FCP-CMND (not SEST index)

      // NOTE: unlike FC LinkService login frames, normal
      // SCSI commands are sent without outgoing verification
      IRB_flags.DCM = 1;    // Disable completion message for Cmnd frame
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += 64L;        // add len to LSB (header & CMND payload)

      CMDfchs->d_id |= (0x06000000L);  // R_CTL = 6 for command

                   // TYPE[31-24] 8 for FCP SCSI
                   // f_ctl[23:0] exchg originator, 1st seq, xfer S.I.
                   //             valid RO
      CMDfchs->f_ctl = 0x08210008L;
      CMDfchs->seq_cnt = 0x0L;
      CMDfchs->ox_rx_id = 0L;        // clear for now (-or- in later)
      CMDfchs->ro = 0x0L;    // relative offset (n/a)

                   // now, fill out FCP-DATA header
                   // (use buffer inside SEST object)
      dataHDR = &fcChip->SEST->DataHDR[ *fcExchangeIndex ];
      dataHDR->reserved = 0L; // must clear
      dataHDR->sof_eof = 0x75002000L;  // SOFi3:EOFn  no UAM; no CLS, noLCr, no TS
      dataHDR->d_id = (InFCHS->s_id | 0x01000000L); // R_CTL= FCP_DATA
      dataHDR->s_id = fcChip->Registers.my_al_pa; // CS_CTL = 0
                   // TYPE[31-24] 8 for FCP SCSI
                   // f_ctl[23:0] xfer S.I.| valid RO
      dataHDR->f_ctl = 0x08010008L;
      dataHDR->seq_cnt = 0x02000000L;  // sequence ID: df_ctl : seqence count
      dataHDR->ox_rx_id = 0L;        // clear; fix-up dataHDR fields later
      dataHDR->ro = 0x0L;    // relative offset (n/a)

                   // Now setup the SEST entry
      pIWE = &fcChip->SEST->u[ *fcExchangeIndex ].IWE;
      
                   // fill out the IWE:

                // VALid entry:Dir outbound:DCM:enable CM:enal INT: FC frame len
      pIWE->Hdr_Len = 0x8e000020L; // data frame Len always 32 bytes
      
      
      // from login parameters with other port, what's the largest frame
      // we can send? 
      if( pLoggedInPort == NULL) 
      {
	ulStatus = INVALID_ARGS;  // failed! give up
	break;
      }
      if( pLoggedInPort->rx_data_size  >= 2048)
        fl = 0x00020000;  // 2048 code (only support 1024!)
      else if( pLoggedInPort->rx_data_size  >= 1024)
        fl = 0x00020000;  // 1024 code
      else if( pLoggedInPort->rx_data_size  >= 512)
        fl = 0x00010000;  // 512 code
      else
	fl = 0;  // 128 bytes -- should never happen
      
      
      pIWE->Hdr_Len |= fl; // add xmit FC frame len for data phase
      pIWE->Hdr_Addr = fcChip->SEST->base + 
		((unsigned long)&fcChip->SEST->DataHDR[*fcExchangeIndex] - 
			(unsigned long)fcChip->SEST);

      pIWE->RSP_Len = sizeof(TachFCHDR_RSP) ; // hdr+data (recv'd RSP frame)
      pIWE->RSP_Len |= (InFCHS->s_id << 8); // MS 24 bits Remote_ID
      
      memset( &fcChip->SEST->RspHDR[ *fcExchangeIndex].pl, 0, 
        sizeof( FCP_STATUS_RESPONSE) );  // clear out previous status
 
      pIWE->RSP_Addr = fcChip->SEST->base + 
		((unsigned long)&fcChip->SEST->RspHDR[*fcExchangeIndex] - 
			(unsigned long)fcChip->SEST);

                   // Do we need local or extended gather list?
                   // depends on size - we can handle 3 len/addr pairs
                   // locally.

      fcp_dl = build_SEST_sgList( 
	cpqfcHBAdata->PciDev,
        &pIWE->GLen1, 
        Cmnd,       // S/G list
        &sgPairs,   // return # of pairs in S/G list (from "Data" descriptor)
        &fcChip->SEST->sgPages[ *fcExchangeIndex ]);// (for Freeing later)

      if( !fcp_dl ) // error building S/G list?
      {
        ulStatus = MEMPOOL_FAIL;
        break;      // give up
      }

                             // Now that we know total data length in
                             // the passed S/G buffer, set FCP CMND frame
      build_FCP_payload( Cmnd, (UCHAR*)&CMDfchs->pl[0], type, fcp_dl );


      
      if( sgPairs > 3 )  // need extended s/g list
        pIWE->Buff_Off = 0x78000000L; // extended data | (no offset)
      else               // local data pointers (in SEST)
        pIWE->Buff_Off = 0xf8000000L; // local data | (no offset)

                              // ULONG 5
      pIWE->Link = 0x0000ffffL;   // Buff_Index | Link

      pIWE->RX_ID = 0x0L;     // DWord 6: RX_ID set by target XFER_RDY

                                      // DWord 7
      pIWE->Data_Len = 0L;    // TL enters rcv'd XFER_RDY BURST_LEN
      pIWE->Exp_RO = 0L;      // DWord 8
                              // DWord 9
      pIWE->Exp_Byte_Cnt = fcp_dl;  // sum of gather buffers
    }
    break;





    case SCSI_IRE: // TachLite Initiator Read Entry

      if( Cmnd->timeout != 0)
      {
//	printk("Cmnd->timeout %d\n", Cmnd->timeout);
	// per Linux Scsi
        Exchanges->fcExchange[ *fcExchangeIndex].timeOut = Cmnd->timeout;
      }
      else  // use our best guess, based on FC & device
      {

        if( Cmnd->SCp.Message == 1 ) // Tape device? (from INQUIRY)	
	{
	  // turn off our timeouts (for now...)
          Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 0xFFFFFFFF; 
	}
	else
	{
          Exchanges->fcExchange[ *fcExchangeIndex].reTries = 1;
          Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 7; // per SCSI req.
	}
      }

  
      // first, build FCP_CMND


      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS FCP-CMND (not SEST index)
                            // NOTE: unlike FC LinkService login frames,
                            // normal SCSI commands are sent "open loop"
      IRB_flags.DCM = 1;    // Disable completion message for Cmnd frame
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += 64L;        // add len to LSB (header & CMND payload)

      CMDfchs->d_id |= (0x06000000L);  // R_CTL = 6 for command

             // TYPE[31-24] 8 for FCP SCSI
             // f_ctl[23:0] exchg originator, 1st seq, xfer S.I.
             //             valid RO
      CMDfchs->f_ctl = 0x08210008L;
      CMDfchs->seq_cnt = 0x0L;
      // x_ID & data direction bit set later
      CMDfchs->ox_rx_id = 0xFFFF;        // clear
      CMDfchs->ro = 0x0L;    // relative offset (n/a)



                   // Now setup the SEST entry
      pIRE = &fcChip->SEST->u[ *fcExchangeIndex ].IRE;

      // fill out the IRE:
      // VALid entry:Dir outbound:enable CM:enal INT:
      pIRE->Seq_Accum = 0xCE000000L; // VAL,DIR inbound,DCM| INI,DAT,RSP

      pIRE->reserved = 0L;
      pIRE->RSP_Len = sizeof(TachFCHDR_RSP) ; // hdr+data (recv'd RSP frame)
      pIRE->RSP_Len |= (InFCHS->s_id << 8); // MS 24 bits Remote_ID

      pIRE->RSP_Addr = fcChip->SEST->base + 
		((unsigned long)&fcChip->SEST->RspHDR[*fcExchangeIndex] - 
			(unsigned long)fcChip->SEST);
      
                   // Do we need local or extended gather list?
                   // depends on size - we can handle 3 len/addr pairs
                   // locally.

      fcp_dl = build_SEST_sgList( 
	cpqfcHBAdata->PciDev,
        &pIRE->SLen1, 
        Cmnd,       // SCSI command Data desc. with S/G list
        &sgPairs,   // return # of pairs in S/G list (from "Data" descriptor)
        &fcChip->SEST->sgPages[ *fcExchangeIndex ]);// (for Freeing later)
      
      
      if( !fcp_dl ) // error building S/G list?
      {
	// It is permissible to have a ZERO LENGTH Read command.
	// If there is the case, simply set fcp_dl (and Exp_Byte_Cnt)
	// to 0 and continue.
	if( Cmnd->request_bufflen == 0 )
	{
	  fcp_dl = 0; // no FC DATA frames expected

	}
	else
	{
          ulStatus = MEMPOOL_FAIL;
          break;      // give up
	}
      }

      // now that we know the S/G length, build CMND payload
      build_FCP_payload( Cmnd, (UCHAR*)&CMDfchs->pl[0], type, fcp_dl );

      
      if( sgPairs > 3 )  // need extended s/g list
        pIRE->Buff_Off = 0x00000000; // DWord 4: extended s/g list, no offset
      else
        pIRE->Buff_Off = 0x80000000; // local data, no offset
      
      pIRE->Buff_Index = 0x0L;    // DWord 5: Buff_Index | Reserved

      pIRE->Exp_RO  = 0x0L;       // DWord 6: Expected Rel. Offset

      pIRE->Byte_Count = 0;  // DWord 7: filled in by TL on err
      pIRE->reserved_ = 0;   // DWord 8: reserved
                             // NOTE: 0 length READ is OK.
      pIRE->Exp_Byte_Cnt = fcp_dl;// DWord 9: sum of scatter buffers
      
      break;




                         // Fibre Channel SCSI 'responder' sequences...
                         // (originator means 'target' in FCP-SCSI)
    case SCSI_TWE: // TachLite Target Write Entry

      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 10; // per SCSI req.

                       // first, build FCP_CMND

      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (XFER_RDY)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += (32L + 12L);// add SFS len (header & XFER_RDY payload)

      CMDfchs->d_id |= (0x05000000L);  // R_CTL = 5 for XFER_RDY

                   // TYPE[31-24] 8 for FCP SCSI
                   // f_ctl[23:0] exchg responder, 1st seq, xfer S.I.
                //             valid RO
      CMDfchs->f_ctl = 0x08810008L;
      CMDfchs->seq_cnt = 0x01000000; // sequence ID: df_ctl: sequence count
                       // use originator (other port's) OX_ID
      CMDfchs->ox_rx_id = InFCHS->ox_rx_id;     // we want upper 16 bits
      CMDfchs->ro = 0x0L;    // relative offset (n/a)

                   // now, fill out FCP-RSP header
                   // (use buffer inside SEST object)

      rspHDR = &fcChip->SEST->RspHDR[ *fcExchangeIndex ];
      rspHDR->reserved = 0L; // must clear
      rspHDR->sof_eof = 0x75000000L;  // SOFi3:EOFn  no UAM; no CLS, noLCr, no TS
      rspHDR->d_id = (InFCHS->s_id | 0x07000000L); // R_CTL= FCP_RSP
      rspHDR->s_id = fcChip->Registers.my_al_pa; // CS_CTL = 0
                   // TYPE[31-24] 8 for FCP SCSI
                   // f_ctl[23:0] responder|last seq| xfer S.I.
      rspHDR->f_ctl = 0x08910000L;
      rspHDR->seq_cnt = 0x03000000;  // sequence ID
      rspHDR->ox_rx_id = InFCHS->ox_rx_id; // gives us OX_ID
      rspHDR->ro = 0x0L;    // relative offset (n/a)


                   // Now setup the SEST entry
                   
      pTWE = &fcChip->SEST->u[ *fcExchangeIndex ].TWE;

      // fill out the TWE:

      // VALid entry:Dir outbound:enable CM:enal INT:
      pTWE->Seq_Accum = 0xC4000000L;  // upper word flags
      pTWE->reserved = 0L;
      pTWE->Remote_Node_ID = 0L; // no more auto RSP frame! (TL/TS change)
      pTWE->Remote_Node_ID |= (InFCHS->s_id << 8); // MS 24 bits Remote_ID
      

                   // Do we need local or extended gather list?
                   // depends on size - we can handle 3 len/addr pairs
                   // locally.

      fcp_dl = build_SEST_sgList( 
	cpqfcHBAdata->PciDev,
        &pTWE->SLen1, 
        Cmnd,       // S/G list
        &sgPairs,   // return # of pairs in S/G list (from "Data" descriptor)
        &fcChip->SEST->sgPages[ *fcExchangeIndex ]);// (for Freeing later)
      
      
      if( !fcp_dl ) // error building S/G list?
      {
        ulStatus = MEMPOOL_FAIL;
        break;      // give up
      }

      // now that we know the S/G length, build CMND payload
      build_FCP_payload( Cmnd, (UCHAR*)&CMDfchs->pl[0], type, fcp_dl );

      
      if( sgPairs > 3 )  // need extended s/g list
        pTWE->Buff_Off = 0x00000000; // extended s/g list, no offset
      else
        pTWE->Buff_Off = 0x80000000; // local data, no offset
      
      pTWE->Buff_Index = 0;     // Buff_Index | Link
      pTWE->Exp_RO = 0;
      pTWE->Byte_Count = 0;  // filled in by TL on err
      pTWE->reserved_ = 0;
      pTWE->Exp_Byte_Cnt = fcp_dl;// sum of scatter buffers
      
      break;






    case SCSI_TRE: // TachLite Target Read Entry

      // It doesn't make much sense for us to "time-out" a READ,
      // but we'll use it for design consistency and internal error recovery.
      Exchanges->fcExchange[ *fcExchangeIndex].timeOut = 10; // per SCSI req.

      // I/O request block settings...
      *pIRB_flags = 0;      // clear IRB flags
                                  // check PRLI (process login) info
                                  // to see if Initiator Requires XFER_RDY
                                  // if not, don't send one!
                                  // { PRLI check...}
      IRB_flags.SFA = 0;    // don't send XFER_RDY - start data
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += (32L + 12L);// add SFS len (header & XFER_RDY payload)


      
      // now, fill out FCP-DATA header
                   // (use buffer inside SEST object)
      dataHDR = &fcChip->SEST->DataHDR[ *fcExchangeIndex ];

      dataHDR->reserved = 0L; // must clear
      dataHDR->sof_eof = 0x75000000L;  // SOFi3:EOFn no UAM; no CLS,noLCr,no TS
      dataHDR->d_id = (InFCHS->s_id | 0x01000000L); // R_CTL= FCP_DATA
      dataHDR->s_id = fcChip->Registers.my_al_pa; // CS_CTL = 0


                   // TYPE[31-24] 8 for FCP SCSI
                   // f_ctl[23:0] exchg responder, not 1st seq, xfer S.I.
                   //             valid RO
      dataHDR->f_ctl = 0x08810008L;
      dataHDR->seq_cnt = 0x01000000;  // sequence ID (no XRDY)
      dataHDR->ox_rx_id = InFCHS->ox_rx_id & 0xFFFF0000; // we want upper 16 bits
      dataHDR->ro = 0x0L;    // relative offset (n/a)

                   // now, fill out FCP-RSP header
                   // (use buffer inside SEST object)
      rspHDR = &fcChip->SEST->RspHDR[ *fcExchangeIndex ];

      rspHDR->reserved = 0L; // must clear
      rspHDR->sof_eof = 0x75000000L;  // SOFi3:EOFn  no UAM; no CLS, noLCr, no TS
      rspHDR->d_id = (InFCHS->s_id | 0x07000000L); // R_CTL= FCP_RSP
      rspHDR->s_id = fcChip->Registers.my_al_pa; // CS_CTL = 0
                   // TYPE[31-24] 8 for FCP SCSI
                   // f_ctl[23:0] responder|last seq| xfer S.I.
      rspHDR->f_ctl = 0x08910000L;
      rspHDR->seq_cnt = 0x02000000;  // sequence ID: df_ctl: sequence count

      rspHDR->ro = 0x0L;    // relative offset (n/a)


      // Now setup the SEST entry
      pTRE = &fcChip->SEST->u[ *fcExchangeIndex ].TRE;


      // VALid entry:Dir outbound:enable CM:enal INT:
      pTRE->Hdr_Len = 0x86010020L; // data frame Len always 32 bytes
      pTRE->Hdr_Addr =  // bus address of dataHDR;
            fcChip->SEST->base + 
		((unsigned long)&fcChip->SEST->DataHDR[ *fcExchangeIndex ] -
			(unsigned long)fcChip->SEST);
	
      pTRE->RSP_Len = 64L; // hdr+data (TL assisted RSP frame)
      pTRE->RSP_Len |= (InFCHS->s_id << 8); // MS 24 bits Remote_ID
      pTRE->RSP_Addr = // bus address of rspHDR
		fcChip->SEST->base + 
			((unsigned long)&fcChip->SEST->RspHDR[ *fcExchangeIndex ] -
				(unsigned long)fcChip->SEST);

                   // Do we need local or extended gather list?
                   // depends on size - we can handle 3 len/addr pairs
                   // locally.

      fcp_dl = build_SEST_sgList( 
	cpqfcHBAdata->PciDev,
        &pTRE->GLen1, 
        Cmnd,       // S/G list
        &sgPairs,   // return # of pairs in S/G list (from "Data" descriptor)
        &fcChip->SEST->sgPages[ *fcExchangeIndex ]);// (for Freeing later)
      
      
      if( !fcp_dl ) // error building S/G list?
      {
        ulStatus = MEMPOOL_FAIL;
        break;      // give up
      }

      // no payload or command to build -- READ doesn't need XRDY

      
      if( sgPairs > 3 )  // need extended s/g list
        pTRE->Buff_Off = 0x78000000L; // extended data | (no offset)
      else               // local data pointers (in SEST)
        pTRE->Buff_Off = 0xf8000000L; // local data | (no offset)

                                            // ULONG 5
      pTRE->Buff_Index = 0L;   // Buff_Index | reserved
      pTRE->reserved = 0x0L;   // DWord 6

                                     // DWord 7: NOTE: zero length will
                                     // hang TachLite!
      pTRE->Data_Len = fcp_dl; // e.g. sum of scatter buffers

      pTRE->reserved_ = 0L;     // DWord 8
      pTRE->reserved__ = 0L;    // DWord 9

      break;





    

    case FCP_RESPONSE: 
                  // Target response frame: this sequence uses an OX/RX ID
                  // pair from a completed SEST exchange.  We built most
                  // of the response frame when we created the TWE/TRE.

      *pIRB_flags = 0;      // clear IRB flags
      IRB_flags.SFA = 1;    // send SFS (RSP)
      SfsLen = *pIRB_flags;

      SfsLen <<= 24;        // shift flags to MSB
      SfsLen += sizeof(TachFCHDR_RSP);// add SFS len (header & RSP payload)
      

      Exchanges->fcExchange[ *fcExchangeIndex].type = 
        FCP_RESPONSE; // change Exchange type to "response" phase

      // take advantage of prior knowledge of OX/RX_ID pair from
      // previous XFER outbound frame (still in fchs of exchange)
      fcChip->SEST->RspHDR[ *fcExchangeIndex ].ox_rx_id = 
        CMDfchs->ox_rx_id;

      // Check the status of the DATA phase of the exchange so we can report
      // status to the initiator
      buildFCPstatus( fcChip, *fcExchangeIndex); // set RSP payload fields

      memcpy(
        CMDfchs,  // re-use same XFER fchs for Response frame
        &fcChip->SEST->RspHDR[ *fcExchangeIndex ],
        sizeof( TachFCHDR_RSP ));
      
        
      break;

    default:
      printk("cpqfcTS: don't know how to build FC type: %Xh(%d)\n", type,type);
      break;

    }

    
    
    if( !ulStatus)  // no errors above?
    {
      // FCHS is built; now build IRB

      // link the just built FCHS (the "command") to the IRB entry 
      // for this Exchange.
      pIRB = &Exchanges->fcExchange[ *fcExchangeIndex].IRB; 
    
                          // len & flags according to command type above
      pIRB->Req_A_SFS_Len = SfsLen;  // includes IRB flags & len
      pIRB->Req_A_SFS_Addr = // TL needs physical addr of frame to send
		fcChip->exch_dma_handle + (unsigned long)CMDfchs - 
			(unsigned long)Exchanges;

      pIRB->Req_A_SFS_D_ID = CMDfchs->d_id << 8; // Dest_ID must be consistent!

    // Exchange is complete except for "fix-up" fields to be set
    // at Tachyon Queuing time:
    //    IRB->Req_A_Trans_ID (OX_ID/ RX_ID):  
    //        for SEST entry, lower bits correspond to actual FC Exchange ID
    //    fchs->OX_ID or RX_ID
    }
    else
    {
#ifdef DBG     
      printk( "FC Error: SEST build Pool Allocation failed\n");
#endif
      // return resources...
      cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, *fcExchangeIndex);  // SEST build failed
    }
  }
  else  // no Exchanges available
  {
    ulStatus = SEST_FULL;
    printk( "FC Error: no fcExchanges available\n");
  }
  return ulStatus;
}






// set RSP payload fields
static void  buildFCPstatus( PTACHYON fcChip, ULONG ExchangeID) 
{
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  FC_EXCHANGE *pExchange = &Exchanges->fcExchange[ExchangeID];  // shorthand
  PFCP_STATUS_RESPONSE pFcpStatus;
  
  memset( &fcChip->SEST->RspHDR[ ExchangeID ].pl, 0,
    sizeof( FCP_STATUS_RESPONSE) );
  if( pExchange->status ) // something wrong?
  {
    pFcpStatus = (PFCP_STATUS_RESPONSE)  // cast RSP buffer for this xchng
      &fcChip->SEST->RspHDR[ ExchangeID ].pl;
    if( pExchange->status & COUNT_ERROR )
    {
      
      // set FCP response len valid (so we can report count error)
      pFcpStatus->fcp_status |= FCP_RSP_LEN_VALID;
      pFcpStatus->fcp_rsp_len = 0x04000000;  // 4 byte len (BIG Endian)

      pFcpStatus->fcp_rsp_info = FCP_DATA_LEN_NOT_BURST_LEN; // RSP_CODE
    }
  }
}


static dma_addr_t 
cpqfc_pci_map_sg_page(
    		struct pci_dev *pcidev,
		ULONG *hw_paddr, 	// where to put phys addr for HW use
		void *sgp_vaddr,	// the virtual address of the sg page 
	 	dma_addr_t *umap_paddr,	// where to put phys addr for unmap
		unsigned int *maplen,	// where to store sg entry length
		int PairCount)		// number of sg pairs used in the page.	
{
	unsigned long aligned_addr = (unsigned long) sgp_vaddr;

	*maplen = PairCount * 8;
        aligned_addr += TL_EXT_SG_PAGE_BYTELEN;
        aligned_addr &= ~(TL_EXT_SG_PAGE_BYTELEN -1);
	
	*umap_paddr = pci_map_single(pcidev, (void *) aligned_addr, 
				*maplen, PCI_DMA_TODEVICE);
	*hw_paddr = (ULONG) *umap_paddr;

#       if BITS_PER_LONG > 32
       		if( *umap_paddr >>32 ) {
       	  		printk("cqpfcTS:Tach SG DMA addr %p>32 bits\n", 
	  			(void*)umap_paddr);
       			return 0;
       		}
#       endif
	return *umap_paddr;
}

static void
cpqfc_undo_SEST_mappings(struct pci_dev *pcidev,
			unsigned long contigaddr, int len, int dir,
  			struct scatterlist *sgl, int use_sg,
    			PSGPAGES *sgPages_head,
			int allocated_pages)
{
	PSGPAGES i, next;

	if (contigaddr != (unsigned long) NULL)
		pci_unmap_single(pcidev, contigaddr, len, dir);

	if (sgl != NULL)
		pci_unmap_sg(pcidev, sgl, use_sg, dir);

	for (i=*sgPages_head; i != NULL ;i = next)
	{
		pci_unmap_single(pcidev, i->busaddr, i->maplen, 
			PCI_DMA_TODEVICE);
		i->busaddr = (dma_addr_t) NULL; 
		i->maplen = 0L; 
		next = i->next;
		kfree(i); 
	}
	*sgPages_head = NULL;
}

// This routine builds scatter/gather lists into SEST entries
// INPUTS:
//   SESTalPair - SEST address @DWordA "Local Buffer Length"
//   sgList     - Scatter/Gather linked list of Len/Address data buffers
// OUTPUT:
//   sgPairs - number of valid address/length pairs
// Remarks:
//   The SEST data buffer pointers only depend on number of
//   length/ address pairs, NOT on the type (IWE, TRE,...)
//   Up to 3 pairs can be referenced in the SEST - more than 3
//   require this Extended S/G list page.  The page holds 4, 8, 16...
//   len/addr pairs, per Scatter/Gather List Page Length Reg.
//   TachLite allows pages to be linked to any depth.

//#define DBG_SEST_SGLIST 1 // for printing out S/G pairs with Ext. pages

static int ap_hi_water = TL_DANGER_SGPAGES;

static ULONG build_SEST_sgList( 
    struct pci_dev *pcidev,
    ULONG *SESTalPairStart,  // the 3 len/address buffers in SEST
    Scsi_Cmnd *Cmnd,
    ULONG *sgPairs, 
    PSGPAGES *sgPages_head)  // link list of TL Ext. S/G pages from O/S Pool
    
{
  ULONG i, AllocatedPages=0; // Tach Ext. S/G page allocations
  ULONG* alPair = SESTalPairStart;
  ULONG* ext_sg_page_phys_addr_place = NULL;
  int PairCount;
  unsigned long ulBuff, contigaddr;
  ULONG total_data_len=0; // (in bytes)
  ULONG bytes_to_go = Cmnd->request_bufflen; // total xfer (S/G sum)
  ULONG thisMappingLen;
  struct scatterlist *sgl = NULL;  // S/G list (Linux format)
  int sg_count, totalsgs; 
  dma_addr_t busaddr;
  unsigned long thislen, offset;
  PSGPAGES *sgpage = sgPages_head;
  PSGPAGES prev_page = NULL;

# define WE_HAVE_SG_LIST (sgl != (unsigned long) NULL)
  contigaddr = (unsigned long) NULL;

  if( !Cmnd->use_sg )  // no S/G list?
  {
	if (bytes_to_go <= TL_MAX_SG_ELEM_LEN)
	{
    		*sgPairs = 1;	// use "local" S/G pair in SEST entry
				// (for now, ignore address bits above #31)

		*alPair++ = bytes_to_go; // bits 18-0, length

		if (bytes_to_go != 0) {
			contigaddr = ulBuff = pci_map_single(pcidev, 
				Cmnd->request_buffer, 
				Cmnd->request_bufflen,
				Cmnd->sc_data_direction);
			// printk("ms %p ", ulBuff);
		}
		else {
			// No data transfer, (e.g.: Test Unit Ready)
			// printk("btg=0 ");
			*sgPairs = 0;
			memset(alPair, 0, sizeof(*alPair));
			return 0;
		}

#		if BITS_PER_LONG > 32
    			if( ulBuff >>32 ) {
      				printk("FATAL! Tachyon DMA address %p "
					"exceeds 32 bits\n", (void*)ulBuff );
      				return 0;
    			}
#		endif
    		*alPair = (ULONG)ulBuff;      
    		return bytes_to_go;
	} 
	else	// We have a single large (too big) contiguous buffer.
	{	// We will have to break it up.  We'll use the scatter
		// gather code way below, but use contigaddr instead
		// of sg_dma_addr(). (this is a very rare case).

		unsigned long btg;
		contigaddr = pci_map_single(pcidev, Cmnd->request_buffer, 
				Cmnd->request_bufflen,
				Cmnd->sc_data_direction);

		// printk("contigaddr = %p, len = %d\n", 
		//	(void *) contigaddr, bytes_to_go);
		totalsgs = 0;
		for (btg = bytes_to_go; btg > 0; ) {
			btg -= ( btg > TL_MAX_SG_ELEM_LEN ? 
				TL_MAX_SG_ELEM_LEN : btg );
			totalsgs++;
		}
		sgl = NULL;
		*sgPairs = totalsgs;
	}
  }
  else  // we do have a scatter gather list
  {
	// [TBD - update for Linux to support > 32 bits addressing]
	// since the format for local & extended S/G lists is different,
	// check if S/G pairs exceeds 3.
	// *sgPairs = Cmnd->use_sg; Nope, that's wrong.
 
	sgl = (struct scatterlist*)Cmnd->request_buffer;  
	sg_count = pci_map_sg(pcidev, sgl, Cmnd->use_sg, 
		Cmnd->sc_data_direction);
  	if( sg_count <= 3 ) {

	// we need to be careful here that no individual mapping
	// is too large, and if any is, that breaking it up
	// doesn't push us over 3 sgs, or, if it does, that we
	// handle that case.  Tachyon can take 0x7FFFF bits for length,
	// but sg structure uses "unsigned int", on the face of it, 
	// up to 0xFFFFFFFF or even more.

		int i;
		unsigned long thislen;

		totalsgs = 0;
		for (i=0;i<sg_count;i++) {
      			thislen = sg_dma_len(&sgl[i]);
			while (thislen >= TL_MAX_SG_ELEM_LEN) {
				totalsgs++;
				thislen -= TL_MAX_SG_ELEM_LEN;
			}
			if (thislen > 0) totalsgs++;
		}
		*sgPairs = totalsgs;
  	} else totalsgs = 999; // as a first estimate, definitely >3, 
			      
	// if (totalsgs != sg_count) 
	//	printk("totalsgs = %d, sgcount=%d\n",totalsgs,sg_count);
  }

  if( totalsgs <= 3 ) // can (must) use "local" SEST list
  {
    while( bytes_to_go)
    {
      offset = 0L;

      if ( WE_HAVE_SG_LIST ) 
	thisMappingLen = sg_dma_len(sgl);
      else					// or contiguous buffer?
	thisMappingLen = bytes_to_go;

      while (thisMappingLen > 0)
      {  
	thislen = thisMappingLen > TL_MAX_SG_ELEM_LEN ? 
		TL_MAX_SG_ELEM_LEN : thisMappingLen;
	bytes_to_go = bytes_to_go - thislen;

	// we have L/A pair; L = thislen, A = physicalAddress
	// load into SEST...

	total_data_len += thislen;
	*alPair = thislen; // bits 18-0, length

	alPair++;

	if ( WE_HAVE_SG_LIST ) 
		ulBuff = sg_dma_address(sgl) + offset;
	else
		ulBuff = contigaddr + offset;

	offset += thislen;

#	if BITS_PER_LONG > 32
		if( ulBuff >>32 ) {
        		printk("cqpfcTS: 2Tach DMA address %p > 32 bits\n", 
				(void*)ulBuff );
		    printk("%s = %p, offset = %ld\n", 
			WE_HAVE_SG_LIST ? "ulBuff" : "contigaddr",
			WE_HAVE_SG_LIST ? (void *) ulBuff : (void *) contigaddr,
				offset);
        		return 0;
      		}
#	endif
        *alPair++ = (ULONG)ulBuff; // lower 32 bits (31-0)
	thisMappingLen -= thislen;
      }

      if ( WE_HAVE_SG_LIST ) ++sgl;  // next S/G pair
	else if (bytes_to_go != 0) printk("BTG not zero!\n");

#     ifdef DBG_SEST_SGLIST
	printk("L=%d ", thisMappingLen);
	printk("btg=%d ", bytes_to_go);
#     endif

    }
    // printk("i:%d\n", *sgPairs);
  }
  else    // more than 3 pairs requires Extended S/G page (Pool Allocation)
  {
    // clear out SEST DWORDs (local S/G addr) C-F (A-B set in following logic)
    for( i=2; i<6; i++)
      alPair[i] = 0;

    PairCount = TL_EXT_SG_PAGE_COUNT;    // forces initial page allocation
    totalsgs = 0;
    while( bytes_to_go )
    {
      // Per SEST format, we can support 524287 byte lengths per
      // S/G pair.  Typical user buffers are 4k, and very rarely
      // exceed 12k due to fragmentation of physical memory pages.
      // However, on certain O/S system (not "user") buffers (on platforms 
      // with huge memories), it's possible to exceed this
      // length in a single S/G address/len mapping, so we have to handle
      // that.

      offset = 0L;
      if ( WE_HAVE_SG_LIST ) 
	thisMappingLen = sg_dma_len(sgl);
      else
	thisMappingLen = bytes_to_go;

      while (thisMappingLen > 0)
      {
	thislen = thisMappingLen > TL_MAX_SG_ELEM_LEN ? 
		TL_MAX_SG_ELEM_LEN : thisMappingLen;
	// printk("%d/%d/%d\n", thislen, thisMappingLen, bytes_to_go);
      
  	// should we load into "this" extended S/G page, or allocate
	// new page?

	if( PairCount >= TL_EXT_SG_PAGE_COUNT )
	{
	  // Now, we have to map the previous page, (triggering buffer bounce)
	  // The first time thru the loop, there won't be a previous page.
	  if (prev_page != NULL) // is there a prev page? 
	  {
		// this code is normally kind of hard to trigger, 
		// you have to use up more than 256 scatter gather 
		// elements to get here.  Cranking down TL_MAX_SG_ELEM_LEN
		// to an absurdly low value (128 bytes or so) to artificially
		// break i/o's into a zillion pieces is how I tested it. 
		busaddr = cpqfc_pci_map_sg_page(pcidev,
				ext_sg_page_phys_addr_place,
				prev_page->page,
        			&prev_page->busaddr,
        			&prev_page->maplen,
				PairCount);
          } 
          // Allocate the TL Extended S/G list page.  We have
          // to allocate twice what we want to ensure required TL alignment
          // (Tachlite TL/TS User Man. Rev 6.0, p 168)
          // We store the original allocated PVOID so we can free later
	  *sgpage = kmalloc( sizeof(SGPAGES), GFP_ATOMIC);
	  if ( ! *sgpage )
          {
		printk("cpqfc: Allocation failed @ %d S/G page allocations\n",
			AllocatedPages);
		total_data_len = 0;  // failure!! Ext. S/G is All-or-none affair

	        // unmap the previous mappings, if any.

	        cpqfc_undo_SEST_mappings(pcidev, contigaddr, 
			Cmnd->request_bufflen,
			Cmnd->sc_data_direction,
  			sgl, Cmnd->use_sg, sgPages_head, AllocatedPages+1);

		// FIXME: testing shows that if we get here, 
		// it's bad news.  (this has been this way for a long 
		// time though, AFAIK.  Not that that excuses it.)

		return 0; // give up (and probably hang the system)
          }
                               // clear out memory we just allocated
	  memset( (*sgpage)->page,0,TL_EXT_SG_PAGE_BYTELEN*2);
	  (*sgpage)->next = NULL;
	  (*sgpage)->busaddr = (dma_addr_t) NULL;
	  (*sgpage)->maplen = 0L;
      
	  // align the memory - TL requires sizeof() Ext. S/G page alignment.
	  // We doubled the actual required size so we could mask off LSBs 
	  // to get desired offset 

	  ulBuff = (unsigned long) (*sgpage)->page;
	  ulBuff += TL_EXT_SG_PAGE_BYTELEN;
	  ulBuff &= ~(TL_EXT_SG_PAGE_BYTELEN -1);

	  // set pointer, in SEST if first Ext. S/G page, or in last pair
	  // of linked Ext. S/G pages... (Only 32-bit PVOIDs, so just 
	  // load lower 32 bits)
	  // NOTE: the Len field must be '0' if this is the first Ext. S/G
	  // pointer in SEST, and not 0 otherwise (we know thislen != 0).

	  *alPair = (alPair != SESTalPairStart) ? thislen : 0;

#	  ifdef DBG_SEST_SGLIST
        	printk("PairCount %d @%p even %Xh, ", 
			PairCount, alPair, *alPair);
#	  endif

	  // Save the place where we need to store the physical
	  // address of this scatter gather page which we get when we map it
	  // (and mapping we can do only after we fill it in.)
	  alPair++;  // next DWORD, will contain phys addr of the ext page
	  ext_sg_page_phys_addr_place = alPair;

	  // Now, set alPair = the virtual addr of the (Extended) S/G page
	  // which will accept the Len/ PhysicalAddress pairs
	  alPair = (ULONG *) ulBuff;

	  AllocatedPages++;
	  if (AllocatedPages >= ap_hi_water)
	  {
		// This message should rarely, if ever, come out.
		// Previously (cpqfc version <= 2.0.5) the driver would
		// just puke if more than 4 SG pages were used, and nobody
		// ever complained about that.  This only comes out if 
		// more than 8 pages are used.

		printk(KERN_WARNING
		"cpqfc: Possible danger.  %d scatter gather pages used.\n"
			"cpqfc: detected seemingly extreme memory "
			"fragmentation or huge data transfers.\n", 
			AllocatedPages);
		ap_hi_water = AllocatedPages+1;
	  }
		
	  PairCount = 1;  // starting new Ext. S/G page
	  prev_page = (*sgpage);  // remember this page, for next time thru
	  sgpage = &((*sgpage)->next);
	}  // end of new TL Ext. S/G page allocation

	*alPair = thislen; // bits 18-0, length (range check above)
      
#	ifdef DBG_SEST_SGLIST
	  printk("PairCount %d @%p, even %Xh, ", PairCount, alPair, *alPair);
#	endif

	alPair++;    // next DWORD, physical address 

	if ( WE_HAVE_SG_LIST ) 
		ulBuff = sg_dma_address(sgl) + offset;
	else
		ulBuff = contigaddr + offset;
	offset += thislen;

#	if BITS_PER_LONG > 32
          if( ulBuff >>32 )
	  {
	    printk("cqpfcTS: 1Tach DMA address %p > 32 bits\n", (void*)ulBuff );
	    printk("%s = %p, offset = %ld\n", 
		WE_HAVE_SG_LIST ? "ulBuff" : "contigaddr",
		WE_HAVE_SG_LIST ? (void *) ulBuff : (void *) contigaddr,
			offset);
	    return 0;
	  }
#	endif

	*alPair = (ULONG) ulBuff; // lower 32 bits (31-0)

#       ifdef DBG_SEST_SGLIST
        printk("odd %Xh\n", *alPair);
#       endif
	alPair++;    // next DWORD, next address/length pair
                                           
	PairCount++; // next Length/Address pair

	// if (PairCount > pc_hi_water)
	// {
		// printk("pc hi = %d ", PairCount);
		// pc_hi_water = PairCount;
	// }
	bytes_to_go -= thislen;
	total_data_len += thislen;  
	thisMappingLen -= thislen;
	totalsgs++;
      } // while (thisMappingLen > 0)
      if ( WE_HAVE_SG_LIST ) sgl++;  // next S/G pair
    } // while (bytes_to_go)

    // printk("Totalsgs=%d\n", totalsgs);
    *sgPairs = totalsgs;

    // PCI map (and bounce) the last (and usually only) extended SG page
    busaddr = cpqfc_pci_map_sg_page(pcidev,
		ext_sg_page_phys_addr_place,
		prev_page->page, 
		&prev_page->busaddr, 
		&prev_page->maplen,
		PairCount);
  }
  return total_data_len;
}



// The Tachlite SEST table is referenced to OX_ID (or RX_ID).  To optimize
// performance and debuggability, we index the Exchange structure to FC X_ID
// This enables us to build exchanges for later en-queing to Tachyon,
// provided we have an open X_ID slot. At Tachyon queing time, we only 
// need an ERQ slot; then "fix-up" references in the 
// IRB, FCHS, etc. as needed.
// RETURNS:
// 0 if successful
// non-zero on error
//sstartex
ULONG cpqfcTSStartExchange( 
  CPQFCHBA *cpqfcHBAdata,                      
  LONG ExchangeID )
{
  PTACHYON fcChip = &cpqfcHBAdata->fcChip;
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  FC_EXCHANGE *pExchange = &Exchanges->fcExchange[ ExchangeID ]; // shorthand
  USHORT producer, consumer;
  ULONG ulStatus=0;
  short int ErqIndex;
  BOOLEAN CompleteExchange = FALSE;  // e.g. ACC replies are complete
  BOOLEAN SestType=FALSE;
  ULONG InboundData=0;

  // We will manipulate Tachlite chip registers here to successfully
  // start exchanges. 

  // Check that link is not down -- we can't start an exchange on a
  // down link!

  if( fcChip->Registers.FMstatus.value & 0x80) // LPSM offline?
  {
printk("fcStartExchange: PSM offline (%Xh), x_ID %Xh, type %Xh, port_id %Xh\n",
         fcChip->Registers.FMstatus.value & 0xFF,
         ExchangeID,
         pExchange->type,
         pExchange->fchs.d_id);

    if( ExchangeID >= TACH_SEST_LEN )  // Link Service Outbound frame?
    {
      // Our most popular LinkService commands are port discovery types
      // (PLOGI/ PDISC...), which are implicitly nullified by Link Down
      // events, so it makes no sense to Que them.  However, ABTS should
      // be queued, since exchange sequences are likely destroyed by
      // Link Down events, and we want to notify other ports of broken
      // sequences by aborting the corresponding exchanges.
      if( pExchange->type != BLS_ABTS )
      {
	ulStatus = LNKDWN_OSLS;
	goto Done;
        // don't Que most LinkServ exchanges on LINK DOWN
      }
    }

    printk("fcStartExchange: Que x_ID %Xh, type %Xh\n", 
      ExchangeID, pExchange->type);
    pExchange->status |= EXCHANGE_QUEUED;
    ulStatus = EXCHANGE_QUEUED;
    goto Done;
  }

  // Make sure ERQ has available space.
  
  producer = (USHORT)fcChip->ERQ->producerIndex; // copies for logical arith.
  consumer = (USHORT)fcChip->ERQ->consumerIndex;
  producer++;  // We are testing for full que by incrementing
  
  if( producer >= ERQ_LEN )  // rollover condition?
    producer = 0;
  if( consumer != producer ) // ERQ not full?
  {
    // ****************** Need Atomic access to chip registers!!********
    
    // remember ERQ PI for copying IRB
    ErqIndex = (USHORT)fcChip->ERQ->producerIndex; 
    fcChip->ERQ->producerIndex = producer; // this is written to Tachyon
               // we have an ERQ slot! If SCSI command, need SEST slot
               // otherwise we are done.

    // Note that Tachyon requires that bit 15 of the OX_ID or RX_ID be
    // set according to direction of data to/from Tachyon for SEST assists.
    // For consistency, enforce this rule for Link Service (non-SEST)
    // exchanges as well.

    // fix-up the X_ID field in IRB
    pExchange->IRB.Req_A_Trans_ID = ExchangeID & 0x7FFF; // 15-bit field

    // fix-up the X_ID field in fchs -- depends on Originator or Responder,
    // outgoing or incoming data?
    switch( pExchange->type )
    {
               // ORIGINATOR types...  we're setting our OX_ID and
               // defaulting the responder's RX_ID to 0xFFFF
    
    case SCSI_IRE:
      // Requirement: set MSB of x_ID for Incoming TL data
      // (see "Tachyon TL/TS User's Manual", Rev 6.0, Sept.'98, pg. 50)
      InboundData = 0x8000;

    case SCSI_IWE:   
      SestType = TRUE;
      pExchange->fchs.ox_rx_id = (ExchangeID | InboundData);
      pExchange->fchs.ox_rx_id <<= 16;     // MSW shift
      pExchange->fchs.ox_rx_id |= 0xffff;  // add default RX_ID
      
      // now fix-up the Data HDR OX_ID (TL automatically does rx_id)
      // (not necessary for IRE -- data buffer unused)
      if( pExchange->type == SCSI_IWE)
      {
        fcChip->SEST->DataHDR[ ExchangeID ].ox_rx_id = 
          pExchange->fchs.ox_rx_id;

      }

      break;


    case FCS_NSR:  // ext. link service Name Service Request
    case ELS_SCR:  // ext. link service State Change Registration
    case ELS_FDISC:// ext. link service login
    case ELS_FLOGI:// ext. link service login
    case ELS_LOGO: // FC-PH extended link service logout
    case BLS_NOP:  // Basic link service No OPeration
    case ELS_PLOGI:// ext. link service login (PLOGI)
    case ELS_PDISC:// ext. link service login (PDISC)
    case ELS_PRLI: // ext. link service process login

      pExchange->fchs.ox_rx_id = ExchangeID;
      pExchange->fchs.ox_rx_id <<= 16;  // MSW shift
      pExchange->fchs.ox_rx_id |= 0xffff;  // and RX_ID

      break;
      



               // RESPONDER types... we must set our RX_ID while preserving
               // sender's OX_ID
               // outgoing (or no) data
    case ELS_RJT:       // extended link service reject 
    case ELS_LOGO_ACC: // FC-PH extended link service logout accept
    case ELS_ACC:      // ext. generic link service accept
    case ELS_PLOGI_ACC:// ext. link service login accept (PLOGI or PDISC)
    case ELS_PRLI_ACC: // ext. link service process login accept

      CompleteExchange = TRUE;   // Reply (ACC or RJT) is end of exchange
      pExchange->fchs.ox_rx_id |= (ExchangeID & 0xFFFF);

      break;


      // since we are a Responder, OX_ID should already be set by
      // cpqfcTSBuildExchange().  We need to -OR- in RX_ID
    case SCSI_TWE:
      SestType = TRUE;
      // Requirement: set MSB of x_ID for Incoming TL data
      // (see "Tachyon TL/TS User's Manual", Rev 6.0, Sept.'98, pg. 50)

      pExchange->fchs.ox_rx_id &= 0xFFFF0000;  // clear RX_ID
      // Requirement: set MSB of RX_ID for Incoming TL data
      // (see "Tachyon TL/TS User's Manual", Rev 6.0, Sept.'98, pg. 50)
      pExchange->fchs.ox_rx_id |= (ExchangeID | 0x8000);
      break;
          
    
    case SCSI_TRE:
      SestType = TRUE;
      
      // there is no XRDY for SEST target read; the data
      // header needs to be updated. Also update the RSP
      // exchange IDs for the status frame, in case it is sent automatically
      fcChip->SEST->DataHDR[ ExchangeID ].ox_rx_id |= ExchangeID;
      fcChip->SEST->RspHDR[ ExchangeID ].ox_rx_id = 
        fcChip->SEST->DataHDR[ ExchangeID ].ox_rx_id;
      
      // for easier FCP response logic (works for TWE and TRE), 
      // copy exchange IDs.  (Not needed if TRE 'RSP' bit set)
      pExchange->fchs.ox_rx_id =
        fcChip->SEST->DataHDR[ ExchangeID ].ox_rx_id;

      break;


    case FCP_RESPONSE:  // using existing OX_ID/ RX_ID pair,
                        // start SFS FCP-RESPONSE frame
      // OX/RX_ID should already be set! (See "fcBuild" above)
      CompleteExchange = TRUE;   // RSP is end of FCP-SCSI exchange

      
      break;


    case BLS_ABTS_RJT:  // uses new RX_ID, since SEST x_ID non-existent
    case BLS_ABTS_ACC:  // using existing OX_ID/ RX_ID pair from SEST entry
      CompleteExchange = TRUE;   // ACC or RJT marks end of FCP-SCSI exchange
    case BLS_ABTS:  // using existing OX_ID/ RX_ID pair from SEST entry


      break;


    default:
      printk("Error on fcStartExchange: undefined type %Xh(%d)\n",
        pExchange->type, pExchange->type);
      return INVALID_ARGS;
    }
    
    
      // X_ID fields are entered -- copy IRB to Tachyon's ERQ
    

    memcpy(
        &fcChip->ERQ->QEntry[ ErqIndex ],  // dest.
        &pExchange->IRB,
        32);  // fixed (hardware) length!

    PCI_TRACEO( ExchangeID, 0xA0)

    // ACTION!  May generate INT and IMQ entry
    writel( fcChip->ERQ->producerIndex,
          fcChip->Registers.ERQproducerIndex.address);

  
    if( ExchangeID >= TACH_SEST_LEN )  // Link Service Outbound frame?
    {
    
      // wait for completion! (TDB -- timeout and chip reset)
      

  PCI_TRACEO( ExchangeID, 0xA4)
  
      enable_irq( cpqfcHBAdata->HostAdapter->irq); // only way to get Sem.
      
      down_interruptible( cpqfcHBAdata->TYOBcomplete); 
  
      disable_irq( cpqfcHBAdata->HostAdapter->irq);
  PCI_TRACE( 0xA4)

      // On login exchanges, BAD_ALPA (non-existent port_id) results in 
      // FTO (Frame Time Out) on the Outbound Completion message.
      // If we got an FTO status, complete the exchange (free up slot)
      if( CompleteExchange ||   // flag from Reply frames
          pExchange->status )   // typically, can get FRAME_TO
      {
    	cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, ExchangeID);  
      }
    }

    else                         // SEST Exchange
    {
      ulStatus = 0;   // ship & pray success (e.g. FCP-SCSI)
      
      if( CompleteExchange )   // by Type of exchange (e.g. end-of-xchng)
      {
    	cpqfcTSCompleteExchange( cpqfcHBAdata->PciDev, fcChip, ExchangeID);  
      }
       
      else
        pExchange->status &= ~EXCHANGE_QUEUED;  // clear ExchangeQueued flag 

    }
  }

  
  else                // ERQ 'producer' = 'consumer' and QUE is full
  {
    ulStatus = OUTQUE_FULL; // Outbound (ERQ) Que full
  }
 
Done: 
  PCI_TRACE( 0xA0)
  return ulStatus; 
}





// Scan fcController->fcExchanges array for a usuable index (a "free"
// exchange).
// Inputs:
//   fcChip - pointer to TachLite chip structure
// Return:
//  index - exchange array element where exchange can be built
//  -1    - exchange array is full
// REMARKS:
// Although this is a (yuk!) linear search, we presume
// that the system will complete exchanges about as quickly as
// they are submitted.  A full Exchange array (and hence, max linear
// search time for free exchange slot) almost guarantees a Fibre problem 
// of some sort.
// In the interest of making exchanges easier to debug, we want a LRU
// (Least Recently Used) scheme.


static LONG FindFreeExchange( PTACHYON fcChip, ULONG type )
{
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  ULONG i;
  ULONG ulStatus=-1;  // assume failure


  if( type == SCSI_IRE ||
      type == SCSI_TRE ||
      type == SCSI_IWE ||
      type == SCSI_TWE)
  {
        // SCSI type - X_IDs should be from 0 to TACH_SEST_LEN-1
    if( fcChip->fcSestExchangeLRU >= TACH_SEST_LEN) // rollover?
      fcChip->fcSestExchangeLRU = 0;
    i = fcChip->fcSestExchangeLRU; // typically it's already free!

    if( Exchanges->fcExchange[i].type == 0 ) // check for "free" element
    {
      ulStatus = 0; // success!
    }
    
    else
    {         // YUK! we need to do a linear search for free element.
              // Fragmentation of the fcExchange array is due to excessively
              // long completions or timeouts.
      
      while( TRUE )
      {
        if( ++i >= TACH_SEST_LEN ) // rollover check
          i = 0;  // beginning of SEST X_IDs

//        printk( "looping for SCSI xchng ID: i=%d, type=%Xh\n", 
//         i, Exchanges->fcExchange[i].type);

        if( Exchanges->fcExchange[i].type == 0 ) // "free"?
        {
          ulStatus = 0; // success!
          break;
        }
        if( i == fcChip->fcSestExchangeLRU ) // wrapped-around array?
        {
          printk( "SEST X_ID space full\n");
          break;       // failed - prevent inf. loop
        }
      }
    }
    fcChip->fcSestExchangeLRU = i + 1; // next! (rollover check next pass)
  }

  
  
  else  // Link Service type - X_IDs should be from TACH_SEST_LEN 
        // to TACH_MAX_XID
  {
    if( fcChip->fcLsExchangeLRU >= TACH_MAX_XID || // range check
        fcChip->fcLsExchangeLRU < TACH_SEST_LEN ) // (e.g. startup)
      fcChip->fcLsExchangeLRU = TACH_SEST_LEN;

    i = fcChip->fcLsExchangeLRU; // typically it's already free!
    if( Exchanges->fcExchange[i].type == 0 ) // check for "free" element
    {
      ulStatus = 0; // success!
    }
    
    else
    {         // YUK! we need to do a linear search for free element
              // Fragmentation of the fcExchange array is due to excessively
              // long completions or timeouts.
      
      while( TRUE )
      {
        if( ++i >= TACH_MAX_XID ) // rollover check
          i = TACH_SEST_LEN;// beginning of Link Service X_IDs

//        printk( "looping for xchng ID: i=%d, type=%Xh\n", 
//         i, Exchanges->fcExchange[i].type);

        if( Exchanges->fcExchange[i].type == 0 ) // "free"?
        {
          ulStatus = 0; // success!
          break;
        }
        if( i == fcChip->fcLsExchangeLRU ) // wrapped-around array?
        {
          printk( "LinkService X_ID space full\n");
          break;       // failed - prevent inf. loop
        }
      }
    }
    fcChip->fcLsExchangeLRU = i + 1; // next! (rollover check next pass)

  }

  if( !ulStatus )  // success?
    Exchanges->fcExchange[i].type = type; // allocate it.
  
  else
    i = -1;  // error - all exchanges "open"

  return i;  
}

static void
cpqfc_pci_unmap_extended_sg(struct pci_dev *pcidev,
	PTACHYON fcChip,
	ULONG x_ID)
{
	// Unmaps the memory regions used to hold the scatter gather lists

	PSGPAGES i;

	// Were there any such regions needing unmapping?
	if (! USES_EXTENDED_SGLIST(fcChip->SEST, x_ID))
		return;	// No such regions, we're outta here.

	// for each extended scatter gather region needing unmapping... 
	for (i=fcChip->SEST->sgPages[x_ID] ; i != NULL ; i = i->next)
		pci_unmap_single(pcidev, i->busaddr, i->maplen,
			PCI_DMA_TODEVICE);
}

// Called also from cpqfcTScontrol.o, so can't be static
void
cpqfc_pci_unmap(struct pci_dev *pcidev, 
	Scsi_Cmnd *cmd, 
	PTACHYON fcChip, 
	ULONG x_ID)
{
	// Undo the DMA mappings
	if (cmd->use_sg) {	// Used scatter gather list for data buffer?
		cpqfc_pci_unmap_extended_sg(pcidev, fcChip, x_ID);
		pci_unmap_sg(pcidev, cmd->buffer, cmd->use_sg,
			cmd->sc_data_direction);
		// printk("umsg %d\n", cmd->use_sg);
	}
	else if (cmd->request_bufflen) {
		// printk("ums %p ", fcChip->SEST->u[ x_ID ].IWE.GAddr1);
		pci_unmap_single(pcidev, fcChip->SEST->u[ x_ID ].IWE.GAddr1,
			cmd->request_bufflen,
			cmd->sc_data_direction);
	}	 
}

// We call this routine to free an Exchange for any reason:
// completed successfully, completed with error, aborted, etc.

// returns FALSE if Exchange failed and "retry" is acceptable
// returns TRUE if Exchange was successful, or retry is impossible
// (e.g. port/device gone).
//scompleteexchange

void cpqfcTSCompleteExchange( 
       struct pci_dev *pcidev,
       PTACHYON fcChip, 
       ULONG x_ID)
{
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  int already_unmapped = 0;
  
  if( x_ID < TACH_SEST_LEN ) // SEST-based (or LinkServ for FCP exchange)
  {
    if( Exchanges->fcExchange[ x_ID ].Cmnd == NULL ) // what#@!
    {
//      TriggerHBA( fcChip->Registers.ReMapMemBase, 0);
      printk(" x_ID %Xh, type %Xh, NULL ptr!\n", x_ID,
			Exchanges->fcExchange[ x_ID ].type);

      goto CleanUpSestResources;  // this path should be very rare.
    }

    // we have Linux Scsi Cmnd ptr..., now check our Exchange status
    // to decide how to complete this SEST FCP exchange

    if( Exchanges->fcExchange[ x_ID ].status ) // perhaps a Tach indicated problem,
                                             // or abnormal exchange completion
    {
      // set FCP Link statistics
     
      if( Exchanges->fcExchange[ x_ID ].status & FC2_TIMEOUT)
        fcChip->fcStats.timeouts++;
      if( Exchanges->fcExchange[ x_ID ].status & INITIATOR_ABORT)
        fcChip->fcStats.FC4aborted++;
      if( Exchanges->fcExchange[ x_ID ].status & COUNT_ERROR)
        fcChip->fcStats.CntErrors++;
      if( Exchanges->fcExchange[ x_ID ].status & LINKFAIL_TX)
        fcChip->fcStats.linkFailTX++;
      if( Exchanges->fcExchange[ x_ID ].status & LINKFAIL_RX)
        fcChip->fcStats.linkFailRX++;
      if( Exchanges->fcExchange[ x_ID ].status & OVERFLOW)
        fcChip->fcStats.CntErrors++;

      // First, see if the Scsi upper level initiated an ABORT on this
      // exchange...
      if( Exchanges->fcExchange[ x_ID ].status == INITIATOR_ABORT )
      {
        printk(" DID_ABORT, x_ID %Xh, Cmnd %p ", 
            x_ID, Exchanges->fcExchange[ x_ID ].Cmnd);
        goto CleanUpSestResources;  // (we don't expect Linux _aborts)
      }

      // Did our driver timeout the Exchange, or did Tachyon indicate
      // a failure during transmission?  Ask for retry with "SOFT_ERROR"
      else if( Exchanges->fcExchange[ x_ID ].status & FC2_TIMEOUT) 
      {
//        printk("result DID_SOFT_ERROR, x_ID %Xh, Cmnd %p\n", 
//            x_ID, Exchanges->fcExchange[ x_ID ].Cmnd);
        Exchanges->fcExchange[ x_ID ].Cmnd->result = (DID_SOFT_ERROR <<16);
      }
      
      // Did frame(s) for an open exchange arrive in the SFQ,
      // meaning the SEST was unable to process them?
      else if( Exchanges->fcExchange[ x_ID ].status & SFQ_FRAME) 
      {
//        printk("result DID_SOFT_ERROR, x_ID %Xh, Cmnd %p\n", 
//            x_ID, Exchanges->fcExchange[ x_ID ].Cmnd);
        Exchanges->fcExchange[ x_ID ].Cmnd->result = (DID_SOFT_ERROR <<16);
      }
      
      // Did our driver timeout the Exchange, or did Tachyon indicate
      // a failure during transmission?  Ask for retry with "SOFT_ERROR"
      else if( 
               (Exchanges->fcExchange[ x_ID ].status & LINKFAIL_TX) ||
               (Exchanges->fcExchange[ x_ID ].status & PORTID_CHANGED) ||
	       (Exchanges->fcExchange[ x_ID ].status & FRAME_TO)    ||
	       (Exchanges->fcExchange[ x_ID ].status & INV_ENTRY)    ||
	       (Exchanges->fcExchange[ x_ID ].status & ABORTSEQ_NOTIFY)    )


      {
//        printk("result DID_SOFT_ERROR, x_ID %Xh, Cmnd %p\n", 
//            x_ID, Exchanges->fcExchange[ x_ID ].Cmnd);
        Exchanges->fcExchange[ x_ID ].Cmnd->result = (DID_SOFT_ERROR <<16);


      }

      // e.g., a LOGOut happened, or device never logged back in.
      else if( Exchanges->fcExchange[ x_ID ].status & DEVICE_REMOVED) 
      {
//	printk(" *LOGOut or timeout on login!* ");
	// trigger?
//        TriggerHBA( fcChip->Registers.ReMapMemBase, 0);

        Exchanges->fcExchange[ x_ID ].Cmnd->result = (DID_BAD_TARGET <<16);
      }      
		
		      
      // Did Tachyon indicate a CNT error?  We need further analysis
      // to determine if the exchange is acceptable
      else if( Exchanges->fcExchange[ x_ID ].status == COUNT_ERROR)
      {
        UCHAR ScsiStatus;
        FCP_STATUS_RESPONSE *pFcpStatus = 
	  (PFCP_STATUS_RESPONSE)&fcChip->SEST->RspHDR[ x_ID ].pl;

      	ScsiStatus = pFcpStatus->fcp_status >>24;
  
	// If the command is a SCSI Read/Write type, we don't tolerate
	// count errors of any kind; assume the count error is due to
	// a dropped frame and ask for retry...
	
	if(( (Exchanges->fcExchange[ x_ID ].Cmnd->cmnd[0] == 0x8) ||
	    (Exchanges->fcExchange[ x_ID ].Cmnd->cmnd[0] == 0x28) ||		
            (Exchanges->fcExchange[ x_ID ].Cmnd->cmnd[0] == 0xA) ||
            (Exchanges->fcExchange[ x_ID ].Cmnd->cmnd[0] == 0x2A) )
	                   &&
                     ScsiStatus == 0 )
	{
          // ask for retry
/*          printk("COUNT_ERROR retry, x_ID %Xh, status %Xh, Cmnd %p\n", 
            x_ID, Exchanges->fcExchange[ x_ID ].status,
            Exchanges->fcExchange[ x_ID ].Cmnd);*/
          Exchanges->fcExchange[ x_ID ].Cmnd->result = (DID_SOFT_ERROR <<16);
	}
	
	else  // need more analysis
	{
	  cpqfcTSCheckandSnoopFCP(fcChip, x_ID);  // (will set ->result)
	}
      }
      
      // default: NOTE! We don't ever want to get here.  Getting here
      // implies something new is happening that we've never had a test
      // case for.  Need code maintenance!  Return "ERROR"
      else
      {
	unsigned int stat = Exchanges->fcExchange[ x_ID ].status;
        printk("DEFAULT result %Xh, x_ID %Xh, Cmnd %p", 
          Exchanges->fcExchange[ x_ID ].status, x_ID, 
	  Exchanges->fcExchange[ x_ID ].Cmnd);

	if (stat & INVALID_ARGS)	printk(" INVALID_ARGS ");
	if (stat & LNKDWN_OSLS)		printk(" LNKDWN_OSLS ");
	if (stat & LNKDWN_LASER)	printk(" LNKDWN_LASER ");
	if (stat & OUTQUE_FULL)		printk(" OUTQUE_FULL ");
	if (stat & DRIVERQ_FULL)	printk(" DRIVERQ_FULL ");
	if (stat & SEST_FULL)		printk(" SEST_FULL ");
	if (stat & BAD_ALPA)		printk(" BAD_ALPA ");
	if (stat & OVERFLOW)		printk(" OVERFLOW ");
	if (stat & COUNT_ERROR)		printk(" COUNT_ERROR ");
	if (stat & LINKFAIL_RX)		printk(" LINKFAIL_RX ");
	if (stat & ABORTSEQ_NOTIFY)	printk(" ABORTSEQ_NOTIFY ");
	if (stat & LINKFAIL_TX)		printk(" LINKFAIL_TX ");
	if (stat & HOSTPROG_ERR)	printk(" HOSTPROG_ERR ");
	if (stat & FRAME_TO)		printk(" FRAME_TO ");
	if (stat & INV_ENTRY)		printk(" INV_ENTRY ");
	if (stat & SESTPROG_ERR)	printk(" SESTPROG_ERR ");
	if (stat & OUTBOUND_TIMEOUT)	printk(" OUTBOUND_TIMEOUT ");
	if (stat & INITIATOR_ABORT)	printk(" INITIATOR_ABORT ");
	if (stat & MEMPOOL_FAIL)	printk(" MEMPOOL_FAIL ");
	if (stat & FC2_TIMEOUT)		printk(" FC2_TIMEOUT ");
	if (stat & TARGET_ABORT)	printk(" TARGET_ABORT ");
	if (stat & EXCHANGE_QUEUED)	printk(" EXCHANGE_QUEUED ");
	if (stat & PORTID_CHANGED)	printk(" PORTID_CHANGED ");
	if (stat & DEVICE_REMOVED)	printk(" DEVICE_REMOVED ");
	if (stat & SFQ_FRAME)		printk(" SFQ_FRAME ");
	printk("\n");

        Exchanges->fcExchange[ x_ID ].Cmnd->result = (DID_ERROR <<16);
      }
    }
    else    // definitely no Tach problem, but perhaps an FCP problem
    {
      // set FCP Link statistic
      fcChip->fcStats.ok++;
      cpqfcTSCheckandSnoopFCP( fcChip, x_ID);  // (will set ->result)    
    }

    cpqfc_pci_unmap(pcidev, Exchanges->fcExchange[x_ID].Cmnd, 
			fcChip, x_ID); // undo DMA mappings.
    already_unmapped = 1;

    // OK, we've set the Scsi "->result" field, so proceed with calling
    // Linux Scsi "done" (if not NULL), and free any kernel memory we
    // may have allocated for the exchange.

  PCI_TRACEO( (ULONG)Exchanges->fcExchange[x_ID].Cmnd, 0xAC);
    // complete the command back to upper Scsi drivers
    if( Exchanges->fcExchange[ x_ID ].Cmnd->scsi_done != NULL)
    {
      // Calling "done" on an Linux _abort() aborted
      // Cmnd causes a kernel panic trying to re-free mem.
      // Actually, we shouldn't do anything with an _abort CMND
      if( Exchanges->fcExchange[ x_ID ].Cmnd->result != (DID_ABORT<<16) )
      {
        PCI_TRACE(0xAC)
	call_scsi_done(Exchanges->fcExchange[ x_ID ].Cmnd);
      }
      else
      {
//	printk(" not calling scsi_done on x_ID %Xh, Cmnd %p\n",
//			x_ID, Exchanges->fcExchange[ x_ID ].Cmnd);
      }
    }
    else{
      printk(" x_ID %Xh, type %Xh, Cdb0 %Xh\n", x_ID,
	Exchanges->fcExchange[ x_ID ].type, 
	Exchanges->fcExchange[ x_ID ].Cmnd->cmnd[0]);	      
      printk(" cpqfcTS: Null scsi_done function pointer!\n");
    }


    // Now, clean up non-Scsi_Cmnd items...
CleanUpSestResources:
   
    if (!already_unmapped) 
	cpqfc_pci_unmap(pcidev, Exchanges->fcExchange[x_ID].Cmnd, 
			fcChip, x_ID); // undo DMA mappings.

    // Was an Extended Scatter/Gather page allocated?  We know
    // this by checking DWORD 4, bit 31 ("LOC") of SEST entry
    if( !(fcChip->SEST->u[ x_ID ].IWE.Buff_Off & 0x80000000))
    {
      PSGPAGES p, next;

      // extended S/G list was used -- Free the allocated ext. S/G pages
      for (p = fcChip->SEST->sgPages[x_ID]; p != NULL; p = next) {
	 next = p->next;
	 kfree(p);
      }
      fcChip->SEST->sgPages[x_ID] = NULL;
    }
  
    Exchanges->fcExchange[ x_ID ].Cmnd = NULL; 
  }  // Done with FCP (SEST) exchanges


  // the remaining logic is common to ALL Exchanges: 
  // FCP(SEST) and LinkServ.

  Exchanges->fcExchange[ x_ID ].type = 0; // there -- FREE!  
  Exchanges->fcExchange[ x_ID ].status = 0; 

  PCI_TRACEO( x_ID, 0xAC)
     
  
  return;
}   // (END of CompleteExchange function)
 



// Unfortunately, we must snoop all command completions in
// order to manipulate certain return fields, and take note of
// device types, etc., to facilitate the Fibre-Channel to SCSI
// "mapping".  
// (Watch for BIG Endian confusion on some payload fields)
void cpqfcTSCheckandSnoopFCP( PTACHYON fcChip, ULONG x_ID)
{
  FC_EXCHANGES *Exchanges = fcChip->Exchanges;
  Scsi_Cmnd *Cmnd = Exchanges->fcExchange[ x_ID].Cmnd;
  FCP_STATUS_RESPONSE *pFcpStatus = 
    (PFCP_STATUS_RESPONSE)&fcChip->SEST->RspHDR[ x_ID ].pl;
  UCHAR ScsiStatus;

  ScsiStatus = pFcpStatus->fcp_status >>24;

#ifdef FCP_COMPLETION_DBG
  printk("ScsiStatus = 0x%X\n", ScsiStatus);
#endif	

  // First, check FCP status
  if( pFcpStatus->fcp_status & FCP_RSP_LEN_VALID )
  {
    // check response code (RSP_CODE) -- most popular is bad len
    // 1st 4 bytes of rsp info -- only byte 3 interesting
    if( pFcpStatus->fcp_rsp_info & FCP_DATA_LEN_NOT_BURST_LEN )
    { 

      // do we EVER get here?
      printk("cpqfcTS: FCP data len not burst len, x_ID %Xh\n", x_ID);
    }
  }

  // for now, go by the ScsiStatus, and manipulate certain
  // commands when necessary...
  if( ScsiStatus == 0) // SCSI status byte "good"?
  {
    Cmnd->result = 0; // everything's OK

    if( (Cmnd->cmnd[0] == INQUIRY)) 
    {
      UCHAR *InquiryData = Cmnd->request_buffer;
      PFC_LOGGEDIN_PORT pLoggedInPort;

      // We need to manipulate INQUIRY
      // strings for COMPAQ RAID controllers to force
      // Linux to scan additional LUNs.  Namely, set
      // the Inquiry string byte 2 (ANSI-approved version)
      // to 2.

      if( !memcmp( &InquiryData[8], "COMPAQ", 6 ))
      {
        InquiryData[2] = 0x2;  // claim SCSI-2 compliance,
                               // so multiple LUNs may be scanned.
                               // (no SCSI-2 problems known in CPQ)
      }
        
      // snoop the Inquiry to detect Disk, Tape, etc. type
      // (search linked list for the port_id we sent INQUIRY to)
      pLoggedInPort = fcFindLoggedInPort( fcChip,
        NULL,     // DON'T search Scsi Nexus (we will set it)
        Exchanges->fcExchange[ x_ID].fchs.d_id & 0xFFFFFF,        
        NULL,     // DON'T search linked list for FC WWN
        NULL);    // DON'T care about end of list
 
      if( pLoggedInPort )
      {
        pLoggedInPort->ScsiNexus.InqDeviceType = InquiryData[0];
      }
      else
      {
	printk("cpqfcTS: can't find LoggedIn FC port %06X for INQUIRY\n",
          Exchanges->fcExchange[ x_ID].fchs.d_id & 0xFFFFFF);
      }
    }
  }


  // Scsi Status not good -- pass it back to caller 

  else
  {
    Cmnd->result = ScsiStatus; // SCSI status byte is 1st
    
    // check for valid "sense" data

    if( pFcpStatus->fcp_status & FCP_SNS_LEN_VALID ) 
    {            // limit Scsi Sense field length!
      int SenseLen = pFcpStatus->fcp_sns_len >>24; // (BigEndian) lower byte
      
      SenseLen = SenseLen > sizeof( Cmnd->sense_buffer) ? 
        sizeof( Cmnd->sense_buffer) : SenseLen;
	   

#ifdef FCP_COMPLETION_DBG	    
      printk("copy sense_buffer %p, len %d, result %Xh\n",
        Cmnd->sense_buffer, SenseLen, Cmnd->result);
#endif	  

      // NOTE: There is some dispute over the FCP response
      // format.  Most FC devices assume that FCP_RSP_INFO
      // is 8 bytes long, in spite of the fact that FCP_RSP_LEN
      // is (virtually) always 0 and the field is "invalid".  
      // Some other devices assume that
      // the FCP_SNS_INFO begins after FCP_RSP_LEN bytes (i.e. 0)
      // when the FCP_RSP is invalid (this almost appears to be
      // one of those "religious" issues).
      // Consequently, we test the usual position of FCP_SNS_INFO
      // for 7Xh, since the SCSI sense format says the first
      // byte ("error code") should be 0x70 or 0x71.  In practice,
      // we find that every device does in fact have 0x70 or 0x71
      // in the first byte position, so this test works for all
      // FC devices.  
      // (This logic is especially effective for the CPQ/DEC HSG80
      // & HSG60 controllers).

      if( (pFcpStatus->fcp_sns_info[0] & 0x70) == 0x70 )
        memcpy( Cmnd->sense_buffer, 
          &pFcpStatus->fcp_sns_info[0], SenseLen);
      else
      {
        unsigned char *sbPtr = 
		(unsigned char *)&pFcpStatus->fcp_sns_info[0];
        sbPtr -= 8;  // back up 8 bytes hoping to find the
	             // start of the sense buffer
        memcpy( Cmnd->sense_buffer, sbPtr, SenseLen);
      }

      // in the special case of Device Reset, tell upper layer
      // to immediately retry (with SOFT_ERROR status)
      // look for Sense Key Unit Attention (0x6) with ASC Device
      // Reset (0x29)
      //	    printk("SenseLen %d, Key = 0x%X, ASC = 0x%X\n",
      //		    SenseLen, Cmnd->sense_buffer[2], 
      //                   Cmnd->sense_buffer[12]);
      if( ((Cmnd->sense_buffer[2] & 0xF) == 0x6) &&
	        (Cmnd->sense_buffer[12] == 0x29) ) // Sense Code "reset"
      {
        Cmnd->result |= (DID_SOFT_ERROR << 16); // "Host" status byte 3rd
      }
 
      // check for SenseKey "HARDWARE ERROR", ASC InternalTargetFailure
      else if(  ((Cmnd->sense_buffer[2] & 0xF) == 0x4) &&  // "hardware error"
      	        (Cmnd->sense_buffer[12] == 0x44) ) // Addtl. Sense Code 
      {
//        printk("HARDWARE_ERROR, Channel/Target/Lun %d/%d/%d\n",
//		Cmnd->channel, Cmnd->target, Cmnd->lun);
      	Cmnd->result |= (DID_ERROR << 16); // "Host" status byte 3rd
      }
      
    }  // (end of sense len valid)

    // there is no sense data to help out Linux's Scsi layers...
    // We'll just return the Scsi status and hope he will "do the 
    // right thing"
    else
    {
      // as far as we know, the Scsi status is sufficient
      Cmnd->result |= (DID_OK << 16); // "Host" status byte 3rd
    }
  }
}



//PPPPPPPPPPPPPPPPPPPPPPPPP  PAYLOAD  PPPPPPPPP
// build data PAYLOAD; SCSI FCP_CMND I.U.
// remember BIG ENDIAN payload - DWord values must be byte-reversed
// (hence the affinity for byte pointer building).

static int build_FCP_payload( Scsi_Cmnd *Cmnd, 
      UCHAR* payload, ULONG type, ULONG fcp_dl )
{
  int i;

  
  switch( type)
  {
		  
    case SCSI_IWE: 
    case SCSI_IRE:        
      // 8 bytes FCP_LUN
      // Peripheral Device or Volume Set addressing, and LUN mapping
      // When the FC port was looked up, we copied address mode
      // and any LUN mask to the scratch pad SCp.phase & .mode

      *payload++ = (UCHAR)Cmnd->SCp.phase;

      // Now, because of "lun masking" 
      // (aka selective storage presentation),
      // the contiguous Linux Scsi lun number may not match the
      // device's lun number, so we may have to "map".  
      
      *payload++ = (UCHAR)Cmnd->SCp.have_data_in;
      
      // We don't know of anyone in the FC business using these 
      // extra "levels" of addressing.  In fact, confusion still exists
      // just using the FIRST level... ;-)
      
      *payload++ = 0;  // 2nd level addressing
      *payload++ = 0;
      *payload++ = 0;  // 3rd level addressing
      *payload++ = 0;
      *payload++ = 0;  // 4th level addressing
      *payload++ = 0;

      // 4 bytes Control Field FCP_CNTL
      *payload++ = 0;    // byte 0: (MSB) reserved
      *payload++ = 0;    // byte 1: task codes

                         // byte 2: task management flags
      // another "use" of the spare field to accomplish TDR
      // note combination needed
      if( (Cmnd->cmnd[0] == RELEASE) &&
          (Cmnd->SCp.buffers_residual == FCP_TARGET_RESET) )
      {
        Cmnd->cmnd[0] = 0;    // issue "Test Unit Ready" for TDR
        *payload++ = 0x20;    // target device reset bit
      }
      else
        *payload++ = 0;    // no TDR
		      // byte 3: (LSB) execution management codes
		      // bit 0 write, bit 1 read (don't set together)
      
      if( fcp_dl != 0 )
      {
        if( type == SCSI_IWE )         // WRITE
          *payload++ = 1;
        else                           // READ
          *payload++ = 2;
      }
      else
      {
	// On some devices, if RD or WR bits are set,
	// and fcp_dl is 0, they will generate an error on the command.
	// (i.e., if direction is specified, they insist on a length).
	*payload++ = 0;                // no data (necessary for CPQ)
      }


      // NOTE: clean this up if/when MAX_COMMAND_SIZE is increased to 16
      // FCP_CDB allows 16 byte SCSI command descriptor blk;
      // Linux SCSI CDB array is MAX_COMMAND_SIZE (12 at this time...)
      for( i=0; (i < Cmnd->cmd_len) && i < MAX_COMMAND_SIZE; i++)
	*payload++ = Cmnd->cmnd[i];

      // if( Cmnd->cmd_len == 16 )
      // {
      //  memcpy( payload, &Cmnd->SCp.buffers_residual, 4);
      // }
      payload+= (16 - i);  

		      // FCP_DL is largest number of expected data bytes
		      // per CDB (i.e. read/write command)
      *payload++ = (UCHAR)(fcp_dl >>24);  // (MSB) 8 bytes data len FCP_DL
      *payload++ = (UCHAR)(fcp_dl >>16);
      *payload++ = (UCHAR)(fcp_dl >>8);
      *payload++ = (UCHAR)fcp_dl;    // (LSB)
      break;

    case SCSI_TWE:          // need FCP_XFER_RDY
      *payload++ = 0;     // (4 bytes) DATA_RO (MSB byte 0)
      *payload++ = 0;
      *payload++ = 0;
      *payload++ = 0;     // LSB (byte 3)
			     // (4 bytes) BURST_LEN
			     // size of following FCP_DATA payload
      *payload++ = (UCHAR)(fcp_dl >>24);  // (MSB) 8 bytes data len FCP_DL
      *payload++ = (UCHAR)(fcp_dl >>16);
      *payload++ = (UCHAR)(fcp_dl >>8);
      *payload++ = (UCHAR)fcp_dl;    // (LSB)
		       // 4 bytes RESERVED
      *payload++ = 0;
      *payload++ = 0;
      *payload++ = 0;
      *payload++ = 0;
      break;

    default:
      break;
  }

  return 0;
}