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/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* $Id$
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include <netinet/in.h>
#include <pthread.h>
#include <string.h>
#include "mthca.h"
struct mthca_ah_page {
struct mthca_ah_page *prev, *next;
void *buf;
struct ibv_mr *mr;
int use_cnt;
unsigned free[0];
};
static struct mthca_ah_page *__add_page(struct mthca_pd *pd, int page_size, int per_page)
{
struct mthca_ah_page *page;
int i;
page = malloc(sizeof *page + per_page * sizeof (int));
if (!page)
return NULL;
if (posix_memalign(&page->buf, page_size, page_size)) {
free(page);
return NULL;
}
page->mr = mthca_reg_mr(&pd->ibv_pd, page->buf, page_size, 0);
if (!page->mr) {
free(page->buf);
free(page);
return NULL;
}
page->mr->context = pd->ibv_pd.context;
page->use_cnt = 0;
for (i = 0; i < per_page; ++i)
page->free[i] = ~0;
page->prev = NULL;
page->next = pd->ah_list;
pd->ah_list = page;
if (page->next)
page->next->prev = page;
return page;
}
int mthca_alloc_av(struct mthca_pd *pd, struct ibv_ah_attr *attr,
struct mthca_ah *ah)
{
if (mthca_is_memfree(pd->ibv_pd.context)) {
ah->av = malloc(sizeof *ah->av);
if (!ah->av)
return -1;
} else {
struct mthca_ah_page *page;
int ps;
int pp;
int i, j;
ps = to_mdev(pd->ibv_pd.context->device)->page_size;
pp = ps / (sizeof *ah->av * 8 * sizeof (int));
pthread_mutex_lock(&pd->ah_mutex);
for (page = pd->ah_list; page; page = page->next)
if (page->use_cnt < ps / sizeof *ah->av)
for (i = 0; i < pp; ++i)
if (page->free[i])
goto found;
page = __add_page(pd, ps, pp);
if (!page) {
pthread_mutex_unlock(&pd->ah_mutex);
return -1;
}
found:
++page->use_cnt;
for (i = 0, j = -1; i < pp; ++i)
if (page->free[i]) {
j = ffs(page->free[i]);
page->free[i] &= ~(1 << (j - 1));
ah->av = page->buf +
(i * 8 * sizeof (int) + (j - 1)) * sizeof *ah->av;
break;
}
ah->key = page->mr->lkey;
ah->page = page;
pthread_mutex_unlock(&pd->ah_mutex);
}
memset(ah->av, 0, sizeof *ah->av);
ah->av->port_pd = htonl(pd->pdn | (attr->port_num << 24));
ah->av->g_slid = attr->src_path_bits;
ah->av->dlid = htons(attr->dlid);
ah->av->msg_sr = (3 << 4) | /* 2K message */
attr->static_rate;
ah->av->sl_tclass_flowlabel = htonl(attr->sl << 28);
if (attr->is_global) {
ah->av->g_slid |= 0x80;
/* XXX get gid_table length */
ah->av->gid_index = (attr->port_num - 1) * 32 +
attr->grh.sgid_index;
ah->av->hop_limit = attr->grh.hop_limit;
ah->av->sl_tclass_flowlabel |=
htonl((attr->grh.traffic_class << 20) |
attr->grh.flow_label);
memcpy(ah->av->dgid, attr->grh.dgid.raw, 16);
} else {
/* Arbel workaround -- low byte of GID must be 2 */
ah->av->dgid[3] = htonl(2);
}
return 0;
}
void mthca_free_av(struct mthca_ah *ah)
{
if (mthca_is_memfree(ah->ibv_ah.context)) {
free(ah->av);
} else {
struct mthca_pd *pd = to_mpd(ah->ibv_ah.pd);
struct mthca_ah_page *page;
int i;
pthread_mutex_lock(&pd->ah_mutex);
page = ah->page;
i = ((void *) ah->av - page->buf) / sizeof *ah->av;
page->free[i / (8 * sizeof (int))] |= 1 << (i % (8 * sizeof (int)));
if (!--page->use_cnt) {
if (page->prev)
page->prev->next = page->next;
else
pd->ah_list = page->next;
if (page->next)
page->next->prev = page->prev;
mthca_dereg_mr(page->mr);
free(page->buf);
free(page);
}
pthread_mutex_unlock(&pd->ah_mutex);
}
}
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