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 <stable@xxxxxxxxxxxxxxx> know about it. >From 6496bbf0ec481966ef9ffe5b6660d8d1b55c60cc Mon Sep 17 00:00:00 2001 From: Eugenia Emantayev <eugenia@xxxxxxxxxxxx> Date: Thu, 29 Dec 2016 18:37:10 +0200 Subject: net/mlx4_en: Fix bad WQE issue From: Eugenia Emantayev <eugenia@xxxxxxxxxxxx> 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. Fixes: 9f519f68cfff ('mlx4_en: Not using Shared Receive Queues') Signed-off-by: Eugenia Emantayev <eugenia@xxxxxxxxxxxx> Signed-off-by: Tariq Toukan <tariqt@xxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/ethernet/mellanox/mlx4/en_rx.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -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 eugenia@xxxxxxxxxxxx are queue-4.4/net-mlx4_en-fix-bad-wqe-issue.patch