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[v2,for-4.4,03/16] net/mlx4_en: Fix bad WQE issue

Message ID 1492019030-13567-4-git-send-email-sumit.semwal@linaro.org
State New
Headers show
Series Stable commits from Ubuntu Xenial 4.4-lts | expand

Commit Message

Sumit Semwal April 12, 2017, 5:43 p.m. UTC 
From: Eugenia Emantayev <eugenia@mellanox.com>


[ Upstream commit 6496bbf0ec481966ef9ffe5b6660d8d1b55c60cc ]

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@mellanox.com>

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>

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

-- 
2.7.4
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Patch

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 28a4b34..82bf1b5 100644
--- 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 mlx4_en_priv *priv)
 		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;