1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
3
4#include <linux/tc_act/tc_csum.h>
5#include "act.h"
6#include "en/tc_priv.h"
7
8static bool
9csum_offload_supported(struct mlx5e_priv *priv,
10		       u32 action,
11		       u32 update_flags,
12		       struct netlink_ext_ack *extack)
13{
14	u32 prot_flags = TCA_CSUM_UPDATE_FLAG_IPV4HDR | TCA_CSUM_UPDATE_FLAG_TCP |
15			 TCA_CSUM_UPDATE_FLAG_UDP;
16
17	/*  The HW recalcs checksums only if re-writing headers */
18	if (!(action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)) {
19		NL_SET_ERR_MSG_MOD(extack,
20				   "TC csum action is only offloaded with pedit");
21		netdev_warn(priv->netdev,
22			    "TC csum action is only offloaded with pedit\n");
23		return false;
24	}
25
26	if (update_flags & ~prot_flags) {
27		NL_SET_ERR_MSG_MOD(extack,
28				   "can't offload TC csum action for some header/s");
29		netdev_warn(priv->netdev,
30			    "can't offload TC csum action for some header/s - flags %#x\n",
31			    update_flags);
32		return false;
33	}
34
35	return true;
36}
37
38static bool
39tc_act_can_offload_csum(struct mlx5e_tc_act_parse_state *parse_state,
40			const struct flow_action_entry *act,
41			int act_index,
42			struct mlx5_flow_attr *attr)
43{
44	struct mlx5e_tc_flow *flow = parse_state->flow;
45
46	return csum_offload_supported(flow->priv, attr->action,
47				      act->csum_flags, parse_state->extack);
48}
49
50static int
51tc_act_parse_csum(struct mlx5e_tc_act_parse_state *parse_state,
52		  const struct flow_action_entry *act,
53		  struct mlx5e_priv *priv,
54		  struct mlx5_flow_attr *attr)
55{
56	return 0;
57}
58
59struct mlx5e_tc_act mlx5e_tc_act_csum = {
60	.can_offload = tc_act_can_offload_csum,
61	.parse_action = tc_act_parse_csum,
62};
63