net/mlx5: fix default queue number in RSS flow rule

[ upstream commit 4a5a1e6 ]

The selection flags for the RX hash define how the received packets will
be distributed between multiple queues.
When creating a new TIR, the queue_num is set to 1 if none of the selection
flags is set.

Applied the same to the RSS desc before checking if it matches a cached
TIR object to save creating a new object every time.

Fixes: fabf8a3 ("net/mlx5: fix shared RSS action release")

Signed-off-by: Lior Margalit <lmargalit@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

drivers/net/mlx5/mlx5_flow_dv.c

@@ -8705,6 +8705,8 @@ flow_dv_hrxq_prepare(struct rte_eth_dev *dev,
 	rss_desc->hash_fields = dev_flow->hash_fields;
 	rss_desc->tunnel = !!(dh->layers & MLX5_FLOW_LAYER_TUNNEL);
 	rss_desc->shared_rss = 0;
+	if (rss_desc->hash_fields == 0)
+		rss_desc->queue_num = 1;
 	*hrxq_idx = mlx5_hrxq_get(dev, rss_desc);
 	if (!*hrxq_idx)
 		return NULL;