[dpdk-stable] [PATCH] net/mlx5: fix metadata item validation for ingress flows

[Viacheslav Ovsiienko <viacheslavo@nvidia.com>]

In legacy metadata mode the metadata register B is engaged to
handle the metadata item. In the ingress domain the hardware
supports the register setting only, the match on register B
is not supported.

Due to this limitation only the SET_META action can be supported
for the ingress flows, the META item should be rejected on
flow validation.

Fixes: 5f3541724e0 ("net/mlx5: fix flow META item validation")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_dv.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 76696b7b62..131d5de586 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -1960,13 +1960,20 @@ flow_dv_validate_item_meta(struct rte_eth_dev *dev __rte_unused,
 					  "isn't supported");
 		if (reg != REG_A)
 			nic_mask.data = priv->sh->dv_meta_mask;
-	} else if (attr->transfer) {
-		return rte_flow_error_set(error, ENOTSUP,
+	} else {
+		if (attr->transfer)
+			return rte_flow_error_set(error, ENOTSUP,
 					RTE_FLOW_ERROR_TYPE_ITEM, item,
 					"extended metadata feature "
 					"should be enabled when "
 					"meta item is requested "
 					"with e-switch mode ");
+		if (attr->ingress)
+			return rte_flow_error_set(error, ENOTSUP,
+					RTE_FLOW_ERROR_TYPE_ITEM, item,
+					"match on metadata for ingress "
+					"is not supported in legacy "
+					"metadata mode");
 	}
 	if (!mask)
 		mask = &rte_flow_item_meta_mask;
-- 
2.18.1