net/mlx5e: Allow dropping specific tunnel packets

In some case, we don't want to allow specific tunnel packets
to host that can avoid to take up high CPU (e.g network attacks).
But other tunnel packets which not matched in hardware will be
sent to host too.

    $ tc filter add dev vxlan_sys_4789 \
	    protocol ip chain 0 parent ffff: prio 1 handle 1 \
	    flower dst_ip 1.1.1.100 ip_proto tcp dst_port 80 \
	    enc_dst_ip 2.2.2.100 enc_key_id 100 enc_dst_port 4789 \
	    action tunnel_key unset pipe action drop

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index dc5fc3350b65f30ab063af34341f01aab062b908..c5d75e2ecf5443e67b28daa4af2cc2250d21fd08 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2485,7 +2485,8 @@ static bool actions_match_supported(struct mlx5e_priv *priv,
 
        if (flow_flag_test(flow, EGRESS) &&
            !((actions & MLX5_FLOW_CONTEXT_ACTION_DECAP) ||
-             (actions & MLX5_FLOW_CONTEXT_ACTION_VLAN_POP)))
+             (actions & MLX5_FLOW_CONTEXT_ACTION_VLAN_POP) ||
+             (actions & MLX5_FLOW_CONTEXT_ACTION_DROP)))
                return false;
 
        if (actions & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)