IB/mthca: Correct reported SRQ size in MemFree case.

MemFree devices need to reserve one shared receive queue (SRQ) work
request for internal use, so the capacity returned from the create_srq
and query_srq methods should be srq->max - 1.

Signed-off-by: Dotan Barak <dotanb@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 209d2bae2256b99d22d7a97f1d6c10cdaddaf187..96fcc64c61cdb8a04378b6dcffdfb77c735313fb 100644 (file)
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -271,7 +271,7 @@ int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
        srq->first_free = 0;
        srq->last_free  = srq->max - 1;
 
-       attr->max_wr    = srq->max;
+       attr->max_wr    = (mthca_is_memfree(dev)) ? srq->max - 1 : srq->max;
        attr->max_sge   = srq->max_gs;
 
        return 0;
@@ -386,7 +386,7 @@ int mthca_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
        } else
                srq_attr->srq_limit = 0;
 
-       srq_attr->max_wr  = srq->max;
+       srq_attr->max_wr  = (mthca_is_memfree(dev)) ? srq->max - 1 : srq->max;
        srq_attr->max_sge = srq->max_gs;
 
 out: