net/mlx5e: Offload TC e-switch rules with ingress VLAN device

Offload TC rule on a VLAN device by matching the VLAN properties
of the VLAN device and emulating vlan pop actions.
Signed-off-by: Eli Britstein <elibr@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

@@ -795,7 +795,8 @@ static int mlx5e_nic_rep_netdevice_event(struct notifier_block *nb,
 	struct mlx5e_priv *priv = netdev_priv(rpriv->netdev);
 	struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
 
-	if (!mlx5e_tc_tun_device_to_offload(priv, netdev))
+	if (!mlx5e_tc_tun_device_to_offload(priv, netdev) &&
+	    !is_vlan_dev(netdev))
 		return NOTIFY_OK;
 
 	switch (event) {

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -1541,11 +1541,23 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 		if (match.mask->n_proto)
 			*match_level = MLX5_MATCH_L2;
 	}
-
-	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN) ||
+	    is_vlan_dev(filter_dev)) {
+		struct flow_dissector_key_vlan filter_dev_mask;
+		struct flow_dissector_key_vlan filter_dev_key;
 		struct flow_match_vlan match;
 
-		flow_rule_match_vlan(rule, &match);
+		if (is_vlan_dev(filter_dev)) {
+			match.key = &filter_dev_key;
+			match.key->vlan_id = vlan_dev_vlan_id(filter_dev);
+			match.key->vlan_tpid = vlan_dev_vlan_proto(filter_dev);
+			match.key->vlan_priority = 0;
+			match.mask = &filter_dev_mask;
+			memset(match.mask, 0xff, sizeof(*match.mask));
+			match.mask->vlan_priority = 0;
+		} else {
+			flow_rule_match_vlan(rule, &match);
+		}
 		if (match.mask->vlan_id ||
 		    match.mask->vlan_priority ||
 		    match.mask->vlan_tpid) {
@@ -2252,7 +2264,8 @@ static bool actions_match_supported(struct mlx5e_priv *priv,
 		actions = flow->nic_attr->action;
 
 	if (flow->flags & MLX5E_TC_FLOW_EGRESS &&
-	    !(actions & MLX5_FLOW_CONTEXT_ACTION_DECAP))
+	    !((actions & MLX5_FLOW_CONTEXT_ACTION_DECAP) ||
+	      (actions & MLX5_FLOW_CONTEXT_ACTION_VLAN_POP)))
 		return false;
 
 	if (actions & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)
@@ -2608,6 +2621,25 @@ static int add_vlan_push_action(struct mlx5e_priv *priv,
 	return err;
 }
 
+static int add_vlan_pop_action(struct mlx5e_priv *priv,
+			       struct mlx5_esw_flow_attr *attr,
+			       u32 *action)
+{
+	int nest_level = vlan_get_encap_level(attr->parse_attr->filter_dev);
+	struct flow_action_entry vlan_act = {
+		.id = FLOW_ACTION_VLAN_POP,
+	};
+	int err = 0;
+
+	while (nest_level--) {
+		err = parse_tc_vlan_action(priv, &vlan_act, attr, action);
+		if (err)
+			return err;
+	}
+
+	return err;
+}
+
 static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 				struct flow_action *flow_action,
 				struct mlx5e_tc_flow *flow,
@@ -2695,6 +2727,12 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 					if (err)
 						return err;
 				}
+				if (is_vlan_dev(parse_attr->filter_dev)) {
+					err = add_vlan_pop_action(priv, attr,
+								  &action);
+					if (err)
+						return err;
+				}
 
 				if (!mlx5e_eswitch_rep(out_dev))
 					return -EOPNOTSUPP;