net/mlx5e: Allow to match on MPLS parameters only for MPLS over UDP

[ Upstream commit 7d6c86e3ccb5ceea767df5c7a9a17cdfccd3df9a ]

Currently, we support hardware offload only for MPLS over UDP.
However, rules matching on MPLS parameters are now wrongly offloaded
for regular MPLS, without actually taking the parameters into
consideration when doing the offload.
Fix it by rejecting such unsupported rules.

Fixes: 72046a91d134 ("net/mlx5e: Allow to match on mpls parameters")
Signed-off-by: Alaa Hleihel <alaa@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 4b8a442..77ee24d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2597,6 +2597,16 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
                        *match_level = MLX5_MATCH_L4;
        }
 
+       /* Currenlty supported only for MPLS over UDP */
+       if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS) &&
+           !netif_is_bareudp(filter_dev)) {
+               NL_SET_ERR_MSG_MOD(extack,
+                                  "Matching on MPLS is supported only for MPLS over UDP");
+               netdev_err(priv->netdev,
+                          "Matching on MPLS is supported only for MPLS over UDP\n");
+               return -EOPNOTSUPP;
+       }
+
        return 0;
 }