net/mlx5e: Don't match double-vlan packets if cvlan is not set

commit ada09af92e621ab500dd80a16d1d0299a18a1180 upstream.

Currently, match VLAN rule also matches packets that have multiple VLAN
headers. This behavior is similar to buggy flower classifier behavior that
has recently been fixed. Fix the issue by matching on
outer_second_cvlan_tag with value 0 which will cause the HW to verify the
packet doesn't contain second vlan header.

Fixes: 699e96ddf47f ("net/mlx5e: Support offloading tc double vlan headers match")
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 8b041deb25e5f425ae8468f5227c618e700022db..60a4ac0ca76da30a32736361181c442f0a0558d2 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2291,6 +2291,17 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
                                 match.key->vlan_priority);
 
                        *match_level = MLX5_MATCH_L2;
+
+                       if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CVLAN) &&
+                           match.mask->vlan_eth_type &&
+                           MLX5_CAP_FLOWTABLE_TYPE(priv->mdev,
+                                                   ft_field_support.outer_second_vid,
+                                                   fs_type)) {
+                               MLX5_SET(fte_match_set_misc, misc_c,
+                                        outer_second_cvlan_tag, 1);
+                               spec->match_criteria_enable |=
+                                       MLX5_MATCH_MISC_PARAMETERS;
+                       }
                }
        } else if (*match_level != MLX5_MATCH_NONE) {
                /* cvlan_tag enabled in match criteria and