net/mlx5e: Add mpls push/pop to tc action infra

Add parsing support by implementing struct mlx5e_tc_act
for this action.
Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/Makefile

@@ -50,7 +50,7 @@ mlx5_core-$(CONFIG_MLX5_CLS_ACT)     += en_tc.o en/rep/tc.o en/rep/neigh.o \
 mlx5_core-$(CONFIG_MLX5_CLS_ACT)     += en/tc/act/act.o en/tc/act/drop.o en/tc/act/trap.o \
 					en/tc/act/accept.o en/tc/act/mark.o en/tc/act/goto.o \
 					en/tc/act/tun.o en/tc/act/csum.o en/tc/act/pedit.o \
-					en/tc/act/vlan.o en/tc/act/vlan_mangle.o
+					en/tc/act/vlan.o en/tc/act/vlan_mangle.o en/tc/act/mpls.o
 
 mlx5_core-$(CONFIG_MLX5_TC_CT)	     += en/tc_ct.o
 mlx5_core-$(CONFIG_MLX5_TC_SAMPLE)   += en/tc/sample.o

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.c

@@ -23,6 +23,17 @@ static struct mlx5e_tc_act *tc_acts_fdb[NUM_FLOW_ACTIONS] = {
 	&mlx5e_tc_act_pedit,
 	&mlx5e_tc_act_pedit,
 	&mlx5e_tc_act_csum,
+	NULL, /* FLOW_ACTION_MARK, */
+	NULL, /* FLOW_ACTION_PTYPE, */
+	NULL, /* FLOW_ACTION_PRIORITY, */
+	NULL, /* FLOW_ACTION_WAKE, */
+	NULL, /* FLOW_ACTION_QUEUE, */
+	NULL, /* FLOW_ACTION_SAMPLE, */
+	NULL, /* FLOW_ACTION_POLICE, */
+	NULL, /* FLOW_ACTION_CT, */
+	NULL, /* FLOW_ACTION_CT_METADATA, */
+	&mlx5e_tc_act_mpls_push,
+	&mlx5e_tc_act_mpls_pop,
 };
 
 /* Must be aligned with enum flow_action_id. */

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h

@@ -18,6 +18,7 @@ struct mlx5e_tc_act_parse_state {
 	struct netlink_ext_ack *extack;
 	bool encap;
 	bool decap;
+	bool mpls_push;
 	const struct ip_tunnel_info *tun_info;
 	struct pedit_headers_action hdrs[__PEDIT_CMD_MAX];
 };
@@ -44,6 +45,8 @@ extern struct mlx5e_tc_act mlx5e_tc_act_csum;
 extern struct mlx5e_tc_act mlx5e_tc_act_pedit;
 extern struct mlx5e_tc_act mlx5e_tc_act_vlan;
 extern struct mlx5e_tc_act mlx5e_tc_act_vlan_mangle;
+extern struct mlx5e_tc_act mlx5e_tc_act_mpls_push;
+extern struct mlx5e_tc_act mlx5e_tc_act_mpls_pop;
 
 struct mlx5e_tc_act *
 mlx5e_tc_act_get(enum flow_action_id act_id,

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/mpls.c

+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include <net/bareudp.h>
+#include "act.h"
+#include "en/tc_priv.h"
+
+static bool
+tc_act_can_offload_mpls_push(struct mlx5e_tc_act_parse_state *parse_state,
+			     const struct flow_action_entry *act,
+			     int act_index)
+{
+	struct netlink_ext_ack *extack = parse_state->extack;
+	struct mlx5e_priv *priv = parse_state->flow->priv;
+
+	if (!MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_l2_to_l3_tunnel) ||
+	    act->mpls_push.proto != htons(ETH_P_MPLS_UC)) {
+		NL_SET_ERR_MSG_MOD(extack, "mpls push is supported only for mpls_uc protocol");
+		return false;
+	}
+
+	return true;
+}
+
+static int
+tc_act_parse_mpls_push(struct mlx5e_tc_act_parse_state *parse_state,
+		       const struct flow_action_entry *act,
+		       struct mlx5e_priv *priv,
+		       struct mlx5_flow_attr *attr)
+{
+	parse_state->mpls_push = true;
+
+	return 0;
+}
+
+static bool
+tc_act_can_offload_mpls_pop(struct mlx5e_tc_act_parse_state *parse_state,
+			    const struct flow_action_entry *act,
+			    int act_index)
+{
+	struct netlink_ext_ack *extack = parse_state->extack;
+	struct mlx5e_tc_flow *flow = parse_state->flow;
+	struct net_device *filter_dev;
+
+	filter_dev = flow->attr->parse_attr->filter_dev;
+
+	/* we only support mpls pop if it is the first action
+	 * and the filter net device is bareudp. Subsequent
+	 * actions can be pedit and the last can be mirred
+	 * egress redirect.
+	 */
+	if (act_index) {
+		NL_SET_ERR_MSG_MOD(extack, "mpls pop supported only as first action");
+		return false;
+	}
+
+	if (!netif_is_bareudp(filter_dev)) {
+		NL_SET_ERR_MSG_MOD(extack, "mpls pop supported only on bareudp devices");
+		return false;
+	}
+
+	return true;
+}
+
+static int
+tc_act_parse_mpls_pop(struct mlx5e_tc_act_parse_state *parse_state,
+		      const struct flow_action_entry *act,
+		      struct mlx5e_priv *priv,
+		      struct mlx5_flow_attr *attr)
+{
+	attr->parse_attr->eth.h_proto = act->mpls_pop.proto;
+	attr->action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
+	flow_flag_set(parse_state->flow, L3_TO_L2_DECAP);
+
+	return 0;
+}
+
+struct mlx5e_tc_act mlx5e_tc_act_mpls_push = {
+	.can_offload = tc_act_can_offload_mpls_push,
+	.parse_action = tc_act_parse_mpls_push,
+};
+
+struct mlx5e_tc_act mlx5e_tc_act_mpls_pop = {
+	.can_offload = tc_act_can_offload_mpls_pop,
+	.parse_action = tc_act_parse_mpls_pop,
+};

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

@@ -3481,7 +3481,6 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 	struct mlx5e_tc_act *tc_act;
 	int err, i, if_count = 0;
 	bool ptype_host = false;
-	bool mpls_push = false;
 
 	err = flow_action_supported(flow_action, extack);
 	if (err)
@@ -3505,37 +3504,6 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 
 			ptype_host = true;
 			break;
-		case FLOW_ACTION_MPLS_PUSH:
-			if (!MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev,
-							reformat_l2_to_l3_tunnel) ||
-			    act->mpls_push.proto != htons(ETH_P_MPLS_UC)) {
-				NL_SET_ERR_MSG_MOD(extack,
-						   "mpls push is supported only for mpls_uc protocol");
-				return -EOPNOTSUPP;
-			}
-			mpls_push = true;
-			break;
-		case FLOW_ACTION_MPLS_POP:
-			/* we only support mpls pop if it is the first action
-			 * and the filter net device is bareudp. Subsequent
-			 * actions can be pedit and the last can be mirred
-			 * egress redirect.
-			 */
-			if (i) {
-				NL_SET_ERR_MSG_MOD(extack,
-						   "mpls pop supported only as first action");
-				return -EOPNOTSUPP;
-			}
-			if (!netif_is_bareudp(parse_attr->filter_dev)) {
-				NL_SET_ERR_MSG_MOD(extack,
-						   "mpls pop supported only on bareudp devices");
-				return -EOPNOTSUPP;
-			}
-
-			parse_attr->eth.h_proto = act->mpls_pop.proto;
-			attr->action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
-			flow_flag_set(flow, L3_TO_L2_DECAP);
-			break;
 		case FLOW_ACTION_REDIRECT_INGRESS: {
 			struct net_device *out_dev;
 
@@ -3594,7 +3562,7 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 				return -EINVAL;
 			}
 
-			if (mpls_push && !netif_is_bareudp(out_dev)) {
+			if (parse_state->mpls_push && !netif_is_bareudp(out_dev)) {
 				NL_SET_ERR_MSG_MOD(extack,
 						   "mpls is supported only through a bareudp device");
 				return -EOPNOTSUPP;