Patch "net/mlx4_en: Fix bad WQE issue" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

net/mlx4_en: Fix bad WQE issue

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
net-mlx4_en-fix-bad-wqe-issue.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Eugenia Emantayev <[email protected]>
Date: Thu, 29 Dec 2016 18:37:10 +0200
Subject: net/mlx4_en: Fix bad WQE issue

From: Eugenia Emantayev <[email protected]>

commit 6496bbf0ec481966ef9ffe5b6660d8d1b55c60cc upstream.

Single send WQE in RX buffer should be stamped with software ownership in order to prevent the flow of QP in error in FW once UPDATE_QP is called.

---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

@@ -439,8 +439,14 @@ int mlx4_en_activate_rx_rings(struct mlx
 		ring->cqn = priv->rx_cq[ring_ind]->mcq.cqn;
 
 		ring->stride = stride;
-		if (ring->stride <= TXBB_SIZE)
+		if (ring->stride <= TXBB_SIZE) {
+			/* Stamp first unused send wqe */
+			__be32 *ptr = (__be32 *)ring->buf;
+			__be32 stamp = cpu_to_be32(1 << STAMP_SHIFT);
+			*ptr = stamp;
+			/* Move pointer to start of rx section */
 			ring->buf += TXBB_SIZE;
+		}
 
 		ring->log_stride = ffs(ring->stride) - 1;
 		ring->buf_size = ring->size * ring->stride;

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/net-mlx4_en-fix-bad-wqe-issue.patch