Ensure an receive WQEs are in memory before linking to chain

Use a write memory barrier to ensure that a receive WQE is fully
written to memory before linking it to the previous WQE.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/qp.c b/src/qp.c
index 2ea9dc0..3d18071 100644
--- a/src/qp.c
+++ b/src/qp.c
@@ -390,6 +390,7 @@ int mthca_tavor_post_recv(struct ibv_qp *ibqp, struct ibv_recv_wr *wr,
 
 		((struct mthca_next_seg *) prev_wqe)->nda_op =
 			htonl((ind << qp->rq.wqe_shift) | 1);
+		wmb();
 		((struct mthca_next_seg *) prev_wqe)->ee_nds =
 			htonl(MTHCA_NEXT_DBD | size);