[dpdk-dev] [PATCH 2/2] net/mlx5: fix memory barrier incorrectly placed

[Chengwen Feng]

The memory barrier is used to ensure that the response is returned
only after the Tx/Rx function is set, it should place after the Rx/Tx
function is set.

Fixes: 2aac5b5d119f ("net/mlx5: sync stop/start with secondary process")
Cc: stable at dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen at huawei.com>
---
 drivers/net/mlx5/linux/mlx5_mp_os.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/linux/mlx5_mp_os.c b/drivers/net/mlx5/linux/mlx5_mp_os.c
index ca529b6..3a4aa76 100644
--- a/drivers/net/mlx5/linux/mlx5_mp_os.c
+++ b/drivers/net/mlx5/linux/mlx5_mp_os.c
@@ -132,7 +132,6 @@ struct rte_mp_msg mp_res;
 	switch (param->type) {
 	case MLX5_MP_REQ_START_RXTX:
 		DRV_LOG(INFO, "port %u starting datapath", dev->data->port_id);
-		rte_mb();
 		dev->rx_pkt_burst = mlx5_select_rx_function(dev);
 		dev->tx_pkt_burst = mlx5_select_tx_function(dev);
 		ppriv = (struct mlx5_proc_priv *)dev->process_private;
@@ -149,6 +148,7 @@ struct rte_mp_msg mp_res;
 				return -rte_errno;
 			}
 		}
+		rte_mb();
 		mp_init_msg(&priv->mp_id, &mp_res, param->type);
 		res->result = 0;
 		ret = rte_mp_reply(&mp_res, peer);
-- 
2.8.1