net/mlx5e: TC, Reject forwarding from internal port to internal port

Reject TC rules that forward from internal port to internal port
as it is not supported.

This include rules that are explicitly have internal port as
the filter device as well as rules that apply on tunnel interfaces
as the route device for the tunnel interface can be an internal
port.

Fixes: 27484f7 ("net/mlx5e: Offload tc rules that redirect to ovs internal port")
Signed-off-by: Ariel Levkovich <lariel@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20221026135153.154807-9-saeed@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Awik84

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

@@ -4066,6 +4066,7 @@ parse_tc_fdb_actions(struct mlx5e_priv *priv,
 	struct mlx5e_tc_flow_parse_attr *parse_attr;
 	struct mlx5_flow_attr *attr = flow->attr;
 	struct mlx5_esw_flow_attr *esw_attr;
+	struct net_device *filter_dev;
 	int err;
 
 	err = flow_action_supported(flow_action, extack);
@@ -4074,6 +4075,7 @@ parse_tc_fdb_actions(struct mlx5e_priv *priv,
 
 	esw_attr = attr->esw_attr;
 	parse_attr = attr->parse_attr;
+	filter_dev = parse_attr->filter_dev;
 	parse_state = &parse_attr->parse_state;
 	mlx5e_tc_act_init_parse_state(parse_state, flow, flow_action, extack);
 	parse_state->ct_priv = get_ct_priv(priv);
@@ -4083,13 +4085,21 @@ parse_tc_fdb_actions(struct mlx5e_priv *priv,
 		return err;
 
 	/* Forward to/from internal port can only have 1 dest */
-	if ((netif_is_ovs_master(parse_attr->filter_dev) || esw_attr->dest_int_port) &&
+	if ((netif_is_ovs_master(filter_dev) || esw_attr->dest_int_port) &&
 	    esw_attr->out_count > 1) {
 		NL_SET_ERR_MSG_MOD(extack,
 				   "Rules with internal port can have only one destination");
 		return -EOPNOTSUPP;
 	}
 
+	/* Forward from tunnel/internal port to internal port is not supported */
+	if ((mlx5e_get_tc_tun(filter_dev) || netif_is_ovs_master(filter_dev)) &&
+	    esw_attr->dest_int_port) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Forwarding from tunnel/internal port to internal port is not supported");
+		return -EOPNOTSUPP;
+	}
+
 	err = actions_prepare_mod_hdr_actions(priv, flow, attr, extack);
 	if (err)
 		return err;