net/mlx5: fix tunnel rules validation on VF representor

[ upstream commit 187f942 ]

MLX5 PMD implicitly adds vxlan_decap flow action to tunnel offload
match type rules. However, VXLAN decap action on VF representors is
not supported on MLX5 PMD hardware.

The patch rejects attempt to create tunnel offload flow rules on VF
representor.

Refer commit 9c4971e ("net/mlx5: update VLAN and encap actions validation")

Fixes: 4ec6360 ("net/mlx5: implement tunnel offload")

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

drivers/net/mlx5/mlx5_flow_dv.c

@@ -5282,6 +5282,11 @@ flow_dv_validate(struct rte_eth_dev *dev, const struct rte_flow_attr *attr,
 	} else {
 		tunnel = NULL;
 	}
+	if (tunnel && priv->representor)
+		return rte_flow_error_set(error, ENOTSUP,
+					  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
+					  "decap not supported "
+					  "for VF representor");
 	grp_info.std_tbl_fix = tunnel_use_standard_attr_group_translate
 				(dev, tunnel, attr, items, actions);
 	ret = flow_dv_validate_attributes(dev, tunnel, attr, &grp_info, error);