diff options
Diffstat (limited to 'drivers/infiniband/hw/mthca/mthca_srq.c')
| -rw-r--r-- | drivers/infiniband/hw/mthca/mthca_srq.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c index 2dd3aea053415..adcaf85355ae6 100644 --- a/drivers/infiniband/hw/mthca/mthca_srq.c +++ b/drivers/infiniband/hw/mthca/mthca_srq.c @@ -192,7 +192,7 @@ int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd, /* Sanity check SRQ size before proceeding */ if (attr->max_wr > dev->limits.max_srq_wqes || - attr->max_sge > dev->limits.max_sg) + attr->max_sge > dev->limits.max_srq_sge) return -EINVAL; srq->max = attr->max_wr; @@ -660,6 +660,31 @@ int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, return err; } +int mthca_max_srq_sge(struct mthca_dev *dev) +{ + if (mthca_is_memfree(dev)) + return dev->limits.max_sg; + + /* + * SRQ allocations are based on powers of 2 for Tavor, + * (although they only need to be multiples of 16 bytes). + * + * Therefore, we need to base the max number of sg entries on + * the largest power of 2 descriptor size that is <= to the + * actual max WQE descriptor size, rather than return the + * max_sg value given by the firmware (which is based on WQE + * sizes as multiples of 16, not powers of 2). + * + * If SRQ implementation is changed for Tavor to be based on + * multiples of 16, the calculation below can be deleted and + * the FW max_sg value returned. + */ + return min_t(int, dev->limits.max_sg, + ((1 << (fls(dev->limits.max_desc_sz) - 1)) - + sizeof (struct mthca_next_seg)) / + sizeof (struct mthca_data_seg)); +} + int __devinit mthca_init_srq_table(struct mthca_dev *dev) { int err; |