RDMA/bnxt_re: Fix Send Work Entry state check while polling completions

Some adapters need a fence Work Entry to handle retransmission.  Currently
the driver checks for this condition, only if the Send queue entry is
signalled. Implement the condition check, irrespective of the signalled
state of the Work queue entries

Failure to add the fence can result in access to memory that is already
marked as completed, triggering data corruption, transmission failure,
IOMMU failures, etc.

Fixes: 9152e0b722b2 ("RDMA/bnxt_re: HW workarounds for handling specific conditions")
Link: https://lore.kernel.org/r/1574671174-5064-3-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
index 958c1ff..4d07d22 100644 (file)
--- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
@@ -2283,13 +2283,13 @@ static int bnxt_qplib_cq_process_req(struct bnxt_qplib_cq *cq,
                        /* Add qp to flush list of the CQ */
                        bnxt_qplib_add_flush_qp(qp);
                } else {
+                       /* Before we complete, do WA 9060 */
+                       if (do_wa9060(qp, cq, cq_cons, sw_sq_cons,
+                                     cqe_sq_cons)) {
+                               *lib_qp = qp;
+                               goto out;
+                       }
                        if (swq->flags & SQ_SEND_FLAGS_SIGNAL_COMP) {
-                               /* Before we complete, do WA 9060 */
-                               if (do_wa9060(qp, cq, cq_cons, sw_sq_cons,
-                                             cqe_sq_cons)) {
-                                       *lib_qp = qp;
-                                       goto out;
-                               }
                                cqe->status = CQ_REQ_STATUS_OK;
                                cqe++;
                                (*budget)--;