Quelle  csum.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.

#include <linux/tc_act/tc_csum.h>
#include "act.h"
#include "en/tc_priv.h"

static bool
csum_offload_supported(struct mlx5e_priv *priv,
         u32 action,
         u32 update_flags,
         struct netlink_ext_ack *extack)
{
 u32 prot_flags = TCA_CSUM_UPDATE_FLAG_IPV4HDR | TCA_CSUM_UPDATE_FLAG_TCP |
    TCA_CSUM_UPDATE_FLAG_UDP;

 /*  The HW recalcs checksums only if re-writing headers */
 if (!(action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)) {
  NL_SET_ERR_MSG_MOD(extack,
       "TC csum action is only offloaded with pedit");
  netdev_warn(priv->netdev,
       "TC csum action is only offloaded with pedit\n");
  return false;
 }

 if (update_flags & ~prot_flags) {
  NL_SET_ERR_MSG_MOD(extack,
       "can't offload TC csum action for some header/s");
  netdev_warn(priv->netdev,
       "can't offload TC csum action for some header/s - flags %#x\n",
       update_flags);
  return false;
 }

 return true;
}

static bool
tc_act_can_offload_csum(struct mlx5e_tc_act_parse_state *parse_state,
   const struct flow_action_entry *act,
   int act_index,
   struct mlx5_flow_attr *attr)
{
 struct mlx5e_tc_flow *flow = parse_state->flow;

 return csum_offload_supported(flow->priv, attr->action,
          act->csum_flags, parse_state->extack);
}

static int
tc_act_parse_csum(struct mlx5e_tc_act_parse_state *parse_state,
    const struct flow_action_entry *act,
    struct mlx5e_priv *priv,
    struct mlx5_flow_attr *attr)
{
 return 0;
}

struct mlx5e_tc_act mlx5e_tc_act_csum = {
 .can_offload = tc_act_can_offload_csum,
 .parse_action = tc_act_parse_csum,
};