Quelle  mpls.c   Sprache: 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 mlx5_flow_attr *attr)
{
 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 void
copy_mpls_info(struct mlx5e_mpls_info *mpls_info,
        const struct flow_action_entry *act)
{
 mpls_info->label = act->mpls_push.label;
 mpls_info->tc = act->mpls_push.tc;
 mpls_info->bos = act->mpls_push.bos;
 mpls_info->ttl = act->mpls_push.ttl;
}

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;
 copy_mpls_info(&parse_state->mpls_info, act);

 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 mlx5_flow_attr *attr)
{
 struct netlink_ext_ack *extack = parse_state->extack;
 struct net_device *filter_dev;

 filter_dev = attr->parse_attr->filter_dev;

 /* we only support mpls pop if it is the first action
 * or it is second action after tunnel key unset
 * and the filter net device is bareudp. Subsequent
 * actions can be pedit and the last can be mirred
 * egress redirect.
 */
 if ((act_index == 1 && !parse_state->decap) || act_index > 1) {
  NL_SET_ERR_MSG_MOD(extack, "mpls pop supported only as first action or with decap");
  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->esw_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,
};