net/mlx5e: Allow to match on mpls parameters

Support matching on MPLS over UDP parameters using misc2 section of
match parameters.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_mplsoudp.c

@@ -73,6 +73,55 @@ static int parse_tunnel(struct mlx5e_priv *priv,
 			void *headers_c,
 			void *headers_v)
 {
+	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
+	struct flow_match_enc_keyid enc_keyid;
+	struct flow_match_mpls match;
+	void *misc2_c;
+	void *misc2_v;
+
+	misc2_c = MLX5_ADDR_OF(fte_match_param, spec->match_criteria,
+			       misc_parameters_2);
+	misc2_v = MLX5_ADDR_OF(fte_match_param, spec->match_value,
+			       misc_parameters_2);
+
+	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS))
+		return 0;
+
+	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_KEYID))
+		return 0;
+
+	flow_rule_match_enc_keyid(rule, &enc_keyid);
+
+	if (!enc_keyid.mask->keyid)
+		return 0;
+
+	if (!(MLX5_CAP_GEN(priv->mdev, flex_parser_protocols) &
+	      MLX5_FLEX_PROTO_CW_MPLS_UDP))
+		return -EOPNOTSUPP;
+
+	flow_rule_match_mpls(rule, &match);
+
+	MLX5_SET(fte_match_set_misc2, misc2_c,
+		 outer_first_mpls_over_udp.mpls_label, match.mask->mpls_label);
+	MLX5_SET(fte_match_set_misc2, misc2_v,
+		 outer_first_mpls_over_udp.mpls_label, match.key->mpls_label);
+
+	MLX5_SET(fte_match_set_misc2, misc2_c,
+		 outer_first_mpls_over_udp.mpls_exp, match.mask->mpls_tc);
+	MLX5_SET(fte_match_set_misc2, misc2_v,
+		 outer_first_mpls_over_udp.mpls_exp, match.key->mpls_tc);
+
+	MLX5_SET(fte_match_set_misc2, misc2_c,
+		 outer_first_mpls_over_udp.mpls_s_bos, match.mask->mpls_bos);
+	MLX5_SET(fte_match_set_misc2, misc2_v,
+		 outer_first_mpls_over_udp.mpls_s_bos, match.key->mpls_bos);
+
+	MLX5_SET(fte_match_set_misc2, misc2_c,
+		 outer_first_mpls_over_udp.mpls_ttl, match.mask->mpls_ttl);
+	MLX5_SET(fte_match_set_misc2, misc2_v,
+		 outer_first_mpls_over_udp.mpls_ttl, match.key->mpls_ttl);
+	spec->match_criteria_enable |= MLX5_MATCH_MISC_PARAMETERS_2;
+
 	return 0;
 }
 

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

@@ -2073,6 +2073,20 @@ static int mlx5e_flower_parse_meta(struct net_device *filter_dev,
 	return 0;
 }
 
+static bool skip_key_basic(struct net_device *filter_dev,
+			   struct flow_cls_offload *f)
+{
+	/* When doing mpls over udp decap, the user needs to provide
+	 * MPLS_UC as the protocol in order to be able to match on mpls
+	 * label fields.  However, the actual ethertype is IP so we want to
+	 * avoid matching on this, otherwise we'll fail the match.
+	 */
+	if (netif_is_bareudp(filter_dev) && f->common.chain_index == 0)
+		return true;
+
+	return false;
+}
+
 static int __parse_cls_flower(struct mlx5e_priv *priv,
 			      struct mlx5e_tc_flow *flow,
 			      struct mlx5_flow_spec *spec,
@@ -2117,7 +2131,8 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 	      BIT(FLOW_DISSECTOR_KEY_IP)  |
 	      BIT(FLOW_DISSECTOR_KEY_CT) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_IP) |
-	      BIT(FLOW_DISSECTOR_KEY_ENC_OPTS))) {
+	      BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) |
+	      BIT(FLOW_DISSECTOR_KEY_MPLS))) {
 		NL_SET_ERR_MSG_MOD(extack, "Unsupported key");
 		netdev_warn(priv->netdev, "Unsupported key used: 0x%x\n",
 			    dissector->used_keys);
@@ -2147,7 +2162,8 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 	if (err)
 		return err;
 
-	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC) &&
+	    !skip_key_basic(filter_dev, f)) {
 		struct flow_match_basic match;
 
 		flow_rule_match_basic(rule, &match);