net/mlx5: fix flow rule creation if ports are stopped

Adding a flow when the port is stopped ends in an inconsistent situation
where the queue can receive traffic when it should not.
Record new rules and apply them as soon as the port is started.

Fixes: 2097d0d1e2 ("net/mlx5: support basic flow items and actions")

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

drivers/net/mlx5/mlx5_flow.c

@@ -948,6 +948,8 @@ priv_flow_create_action_queue(struct priv *priv,
 				   NULL, "cannot allocate QP");
 		goto error;
 	}
+	if (!priv->started)
+		return rte_flow;
 	rte_flow->ibv_flow = ibv_exp_create_flow(rte_flow->qp,
 						 rte_flow->ibv_attr);
 	if (!rte_flow->ibv_flow) {