[dpdk-stable] [PATCH] net/mlx5: fix running without rxq

[Shiri Kuzin]

When running mlx5_dev_start in mlx5_ethdev the function calls
mlx5_dev_configure_rss_reta in order to configure the rxq's.

Before mlx5_dev_configure_rss_reta there isn't a check whether
there are rxq's and if rxq's are 0 the function fails.
For example, this command:
/build/app/test-pmd/testpmd -n 4  -w 0000:08:00.0,rx_vec_en=0
-- --burst=64 --mbcache=512 -i  --nb-cores=27  --txd=2048 --rxd=2048
--vxlan-gpe-port=6081 --mp-alloc=xbuf --rxq 0 --forward-mode=txonly
would fail.

In order to fix this issue, we should call mlx5_dev_configure_rss_reta
only if we have rxq's.

Fixes: 63bd16292c3a ("net/mlx5: support RSS on hairpin")
Cc: stable at dpdk.org

Signed-off-by: Shiri Kuzin <shirik at mellanox.com>
Acked-by: Matan Azrad <matan at mellanox.com>
---
 drivers/net/mlx5/mlx5_trigger.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index be47df5..571b7a0 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -280,11 +280,13 @@
 		rte_net_mlx5_dynf_inline_mask = 1UL << fine_inline;
 	else
 		rte_net_mlx5_dynf_inline_mask = 0;
-	ret = mlx5_dev_configure_rss_reta(dev);
-	if (ret) {
-		DRV_LOG(ERR, "port %u reta config failed: %s",
-			dev->data->port_id, strerror(rte_errno));
-		return -rte_errno;
+	if (dev->data->nb_rx_queues > 0) {
+		ret = mlx5_dev_configure_rss_reta(dev);
+		if (ret) {
+			DRV_LOG(ERR, "port %u reta config failed: %s",
+				dev->data->port_id, strerror(rte_errno));
+			return -rte_errno;
+		}
 	}
 	ret = mlx5_txq_start(dev);
 	if (ret) {
-- 
1.8.3.1