[dpdk-stable] [PATCH v2] net/mlx5: fix meter yellow policy with RSS action

[Bing Zhao]

The RSS configuration in a policy action container was a pointer
inside a union, and the pointer area could be used as other fate
action. In the current implementation, the RSS of the green color
was prior to that of the yellow color. There was a high possibility
the pointer was considered as the RSS and result in a error flow
expansion when only the yellow color had the RSS action.

The check of the fate action type should also be done to get rid of
the misjudgment.

Fixes: b38a12272b3a ("net/mlx5: split meter color policy handling")
Cc: stable at dpdk.org

Signed-off-by: Bing Zhao <bingz at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>
---
v2: fix the spelling typo in the commit log
---
 drivers/net/mlx5/mlx5_flow.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 509ca01859..4f5211a90d 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -3594,6 +3594,8 @@ flow_get_rss_action(struct rte_eth_dev *dev,
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
 	const struct rte_flow_action_rss *rss = NULL;
+	struct mlx5_meter_policy_action_container *acg;
+	struct mlx5_meter_policy_action_container *acy;
 
 	for (; actions->type != RTE_FLOW_ACTION_TYPE_END; actions++) {
 		switch (actions->type) {
@@ -3629,9 +3631,18 @@ flow_get_rss_action(struct rte_eth_dev *dev,
 					if (!policy)
 						return NULL;
 				}
-				if (policy->is_rss)
-					rss =
-				policy->act_cnt[RTE_COLOR_GREEN].rss->conf;
+				if (policy->is_rss) {
+					acg =
+					&policy->act_cnt[RTE_COLOR_GREEN];
+					acy =
+					&policy->act_cnt[RTE_COLOR_YELLOW];
+					if (acg->fate_action ==
+					    MLX5_FLOW_FATE_SHARED_RSS)
+						rss = acg->rss->conf;
+					else if (acy->fate_action ==
+						 MLX5_FLOW_FATE_SHARED_RSS)
+						rss = acy->rss->conf;
+				}
 			}
 			break;
 		}
-- 
2.27.0