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
8 static bool
csum_offload_supported(struct mlx5e_priv * priv,u32 action,u32 update_flags,struct netlink_ext_ack * extack)9 csum_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
38 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)39 tc_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
50 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)51 tc_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
59 struct mlx5e_tc_act mlx5e_tc_act_csum = {
60 .can_offload = tc_act_can_offload_csum,
61 .parse_action = tc_act_parse_csum,
62 };
63