[PATCH AUTOSEL 4.14 45/61] net/mlx5e: Set vlan masks for all offloaded TC rules

[Sasha Levin]

From: Jianbo Liu <jianbol@xxxxxxxxxxxx>

[ Upstream commit cee26487620bc9bc3c7db21b6984d91f7bae12ae ]

In flow steering, if asked to, the hardware matches on the first ethertype
which is not vlan. It's possible to set a rule as follows, which is meant
to match on untagged packet, but will match on a vlan packet:
    tc filter add dev eth0 parent ffff: protocol ip flower ...

To avoid this for packets with single tag, we set vlan masks to tell
hardware to check the tags for every matched packet.

Fixes: 095b6cfd69ce ('net/mlx5e: Add TC vlan match parsing')
Signed-off-by: Jianbo Liu <jianbol@xxxxxxxxxxxx>
Reviewed-by: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index e28f9dab9ceb..9e0be077df9c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -864,6 +864,9 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 			MLX5_SET(fte_match_set_lyr_2_4, headers_c, first_prio, mask->vlan_priority);
 			MLX5_SET(fte_match_set_lyr_2_4, headers_v, first_prio, key->vlan_priority);
 		}
+	} else {
+		MLX5_SET(fte_match_set_lyr_2_4, headers_c, svlan_tag, 1);
+		MLX5_SET(fte_match_set_lyr_2_4, headers_c, cvlan_tag, 1);
 	}
 
 	if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
-- 
2.17.1