RDMA/bnxt_re: Fix WQE Size posted to HW to prevent it from throwing error

Posting WQE size of 2 results in a WQE_FORMAT_ERROR
thrown by the HW as it requires host to supply WQE Size with room
for atleast one SGE so that the resulting WQE size be atleast 3.

Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
index f05500b..8ef39df 100644 (file)
--- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
@@ -1128,6 +1128,11 @@ int bnxt_qplib_post_send(struct bnxt_qplib_qp *qp,
                }
                /* Each SGE entry = 1 WQE size16 */
                wqe_size16 = wqe->num_sge;
+               /* HW requires wqe size has room for atleast one SGE even if
+                * none was supplied by ULP
+                */
+               if (!wqe->num_sge)
+                       wqe_size16++;
        }
 
        /* Specifics */
@@ -1364,6 +1369,11 @@ int bnxt_qplib_post_recv(struct bnxt_qplib_qp *qp,
        rqe->flags = wqe->flags;
        rqe->wqe_size = wqe->num_sge +
                        ((offsetof(typeof(*rqe), data) + 15) >> 4);
+       /* HW requires wqe size has room for atleast one SGE even if none
+        * was supplied by ULP
+        */
+       if (!wqe->num_sge)
+               rqe->wqe_size++;
 
        /* Supply the rqe->wr_id index to the wr_id_tbl for now */
        rqe->wr_id[0] = cpu_to_le32(sw_prod);