net/mlx5e: Allow matching only enc_key_id/enc_dst_port for decapsulation action

In some case, we don't care the enc_src_ip and enc_dst_ip, and
if we don't match the field enc_src_ip and enc_dst_ip, we can use
fewer flows in hardware when revice the tunnel packets. For example,
the tunnel packets may be sent from different hosts, we must offload
one rule for each host.

	$ tc filter add dev vxlan0 protocol ip parent ffff: prio 1 \
		flower dst_mac 00:11:22:33:44:00 \
		enc_src_ip Host0_IP enc_dst_ip 2.2.2.100 \
		enc_dst_port 4789 enc_key_id 100 \
		action tunnel_key unset action mirred egress redirect dev eth0_1

	$ tc filter add dev vxlan0 protocol ip parent ffff: prio 1 \
		flower dst_mac 00:11:22:33:44:00 \
		enc_src_ip Host1_IP enc_dst_ip 2.2.2.100 \
		enc_dst_port 4789 enc_key_id 100 \
		action tunnel_key unset action mirred egress redirect dev eth0_1

If we support flows which only match the enc_key_id and enc_dst_port,
a flow can process the packets sent to VM which (mac 00:11:22:33:44:00).

	$ tc filter add dev vxlan0 protocol ip parent ffff: prio 1 \
		flower dst_mac 00:11:22:33:44:00 \
		enc_dst_port 4789 enc_key_id 100 \
		action tunnel_key unset action mirred egress redirect dev eth0_1
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>

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

@@ -1339,7 +1339,6 @@ static int parse_tunnel_attr(struct mlx5e_priv *priv,
 	void *headers_v = MLX5_ADDR_OF(fte_match_param, spec->match_value,
 				       outer_headers);
 	struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
-	struct flow_match_control enc_control;
 	int err;
 
 	err = mlx5e_tc_tun_parse(filter_dev, priv, spec, f,
@@ -1350,9 +1349,7 @@ static int parse_tunnel_attr(struct mlx5e_priv *priv,
 		return err;
 	}
 
-	flow_rule_match_enc_control(rule, &enc_control);
-
-	if (enc_control.key->addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
 		struct flow_match_ipv4_addrs match;
 
 		flow_rule_match_enc_ipv4_addrs(rule, &match);
@@ -1372,7 +1369,7 @@ static int parse_tunnel_attr(struct mlx5e_priv *priv,
 
 		MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, headers_c, ethertype);
 		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ethertype, ETH_P_IP);
-	} else if (enc_control.key->addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
+	} else if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
 		struct flow_match_ipv6_addrs match;
 
 		flow_rule_match_enc_ipv6_addrs(rule, &match);
@@ -1504,22 +1501,12 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 		return -EOPNOTSUPP;
 	}
 
-	if ((flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) ||
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) ||
+	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) ||
 	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_KEYID) ||
-	     flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) &&
-	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
-		struct flow_match_control match;
-
-		flow_rule_match_enc_control(rule, &match);
-		switch (match.key->addr_type) {
-		case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
-		case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
+	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 		if (parse_tunnel_attr(priv, spec, f, filter_dev, tunnel_match_level))
 			return -EOPNOTSUPP;
-			break;
-		default:
-			return -EOPNOTSUPP;
-		}
 
 		/* In decap flow, header pointers should point to the inner
 		 * headers, outer header were already set by parse_tunnel_attr