5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx> [ Upstream commit c63e1c4dfc33d1bdae395ee8fbcbfad4830b12c0 ] While creating qps, the driver adds one extra entry to the sq size passed by the ULPs in order to avoid queue full condition. When ULPs creates QPs with max_qp_wr reported, driver creates QP with 1 more than the max_wqes supported by HW. Create QP fails in this case. To avoid this error, reduce 1 entry in max_qp_wqes and report it to the stack. Link: https://lore.kernel.org/r/1606741986-16477-1-git-send-email-selvin.xavier@xxxxxxxxxxxx Signed-off-by: Devesh Sharma <devesh.sharma@xxxxxxxxxxxx> Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/infiniband/hw/bnxt_re/qplib_sp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/bnxt_re/qplib_sp.c b/drivers/infiniband/hw/bnxt_re/qplib_sp.c index 079aaaaffec7..f623f881a95b 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_sp.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_sp.c @@ -118,7 +118,7 @@ int bnxt_qplib_get_dev_attr(struct bnxt_qplib_rcfw *rcfw, * 128 WQEs needs to be reserved for the HW (8916). Prevent * reporting the max number */ - attr->max_qp_wqes -= BNXT_QPLIB_RESERVED_QP_WRS; + attr->max_qp_wqes -= BNXT_QPLIB_RESERVED_QP_WRS + 1; attr->max_qp_sges = bnxt_qplib_is_chip_gen_p5(rcfw->res->cctx) ? 6 : sb->max_sge; attr->max_cq = le32_to_cpu(sb->max_cq); -- 2.39.5
