[dpdk-stable] [PATCH 02/33] net/mlx5: fix flow creation with a single target queue

[Shahaf Shuler <shahafs@mellanox.com>]

From: Nélio Laranjeiro <nelio.laranjeiro@6wind.com>

[ upstream commit c55a1667950f43be515c976269749a2a00c7268d ]

Adding a pattern targeting a single queues wrongly behaves as it is an RSS
request, ending by creating several Verbs flows rules to match the RSS
configuration.

Fixes: 8086cf08b2f0 ("net/mlx5: handle RSS hash configuration in RSS flow")
Cc: stable@dpdk.org

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx5/mlx5_flow.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 26002c4b9f..bf718f8947 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -912,6 +912,16 @@ priv_flow_convert_finalise(struct priv *priv, struct mlx5_flow_parse *parser)
 	unsigned int i;
 
 	(void)priv;
+	/* Remove any other flow not matching the pattern. */
+	if (parser->queues_n == 1) {
+		for (i = 0; i != hash_rxq_init_n; ++i) {
+			if (i == HASH_RXQ_ETH)
+				continue;
+			rte_free(parser->queue[i].ibv_attr);
+			parser->queue[i].ibv_attr = NULL;
+		}
+		return;
+	}
 	if (parser->layer == HASH_RXQ_ETH) {
 		goto fill;
 	} else {
@@ -1758,6 +1768,7 @@ priv_flow_create_action_queue(struct priv *priv,
 {
 	int err = 0;
 	unsigned int i;
+	unsigned int flows_n = 0;
 
 	assert(priv->pd);
 	assert(priv->ctx);
@@ -1782,11 +1793,17 @@ priv_flow_create_action_queue(struct priv *priv,
 			err = ENOMEM;
 			goto error;
 		}
+		++flows_n;
 		DEBUG("%p type %d QP %p ibv_flow %p",
 		      (void *)flow, i,
 		      (void *)flow->frxq[i].hrxq,
 		      (void *)flow->frxq[i].ibv_flow);
 	}
+	if (!flows_n) {
+		rte_flow_error_set(error, EINVAL, RTE_FLOW_ERROR_TYPE_HANDLE,
+				   NULL, "internal error in flow creation");
+		goto error;
+	}
 	for (i = 0; i != parser->queues_n; ++i) {
 		struct mlx5_rxq_data *q =
 			(*priv->rxqs)[parser->queues[i]];
-- 
2.12.0