1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 // Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
3
4 #include <net/bareudp.h>
5 #include "act.h"
6 #include "en/tc_priv.h"
7
8 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)9 tc_act_can_offload_mpls_push(struct mlx5e_tc_act_parse_state *parse_state,
10 const struct flow_action_entry *act,
11 int act_index,
12 struct mlx5_flow_attr *attr)
13 {
14 struct netlink_ext_ack *extack = parse_state->extack;
15 struct mlx5e_priv *priv = parse_state->flow->priv;
16
17 if (!MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_l2_to_l3_tunnel) ||
18 act->mpls_push.proto != htons(ETH_P_MPLS_UC)) {
19 NL_SET_ERR_MSG_MOD(extack, "mpls push is supported only for mpls_uc protocol");
20 return false;
21 }
22
23 return true;
24 }
25
26 static void
copy_mpls_info(struct mlx5e_mpls_info * mpls_info,const struct flow_action_entry * act)27 copy_mpls_info(struct mlx5e_mpls_info *mpls_info,
28 const struct flow_action_entry *act)
29 {
30 mpls_info->label = act->mpls_push.label;
31 mpls_info->tc = act->mpls_push.tc;
32 mpls_info->bos = act->mpls_push.bos;
33 mpls_info->ttl = act->mpls_push.ttl;
34 }
35
36 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)37 tc_act_parse_mpls_push(struct mlx5e_tc_act_parse_state *parse_state,
38 const struct flow_action_entry *act,
39 struct mlx5e_priv *priv,
40 struct mlx5_flow_attr *attr)
41 {
42 parse_state->mpls_push = true;
43 copy_mpls_info(&parse_state->mpls_info, act);
44
45 return 0;
46 }
47
48 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)49 tc_act_can_offload_mpls_pop(struct mlx5e_tc_act_parse_state *parse_state,
50 const struct flow_action_entry *act,
51 int act_index,
52 struct mlx5_flow_attr *attr)
53 {
54 struct netlink_ext_ack *extack = parse_state->extack;
55 struct net_device *filter_dev;
56
57 filter_dev = attr->parse_attr->filter_dev;
58
59 /* we only support mpls pop if it is the first action
60 * or it is second action after tunnel key unset
61 * and the filter net device is bareudp. Subsequent
62 * actions can be pedit and the last can be mirred
63 * egress redirect.
64 */
65 if ((act_index == 1 && !parse_state->decap) || act_index > 1) {
66 NL_SET_ERR_MSG_MOD(extack, "mpls pop supported only as first action or with decap");
67 return false;
68 }
69
70 if (!netif_is_bareudp(filter_dev)) {
71 NL_SET_ERR_MSG_MOD(extack, "mpls pop supported only on bareudp devices");
72 return false;
73 }
74
75 return true;
76 }
77
78 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)79 tc_act_parse_mpls_pop(struct mlx5e_tc_act_parse_state *parse_state,
80 const struct flow_action_entry *act,
81 struct mlx5e_priv *priv,
82 struct mlx5_flow_attr *attr)
83 {
84 attr->esw_attr->eth.h_proto = act->mpls_pop.proto;
85 attr->action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
86 flow_flag_set(parse_state->flow, L3_TO_L2_DECAP);
87
88 return 0;
89 }
90
91 struct mlx5e_tc_act mlx5e_tc_act_mpls_push = {
92 .can_offload = tc_act_can_offload_mpls_push,
93 .parse_action = tc_act_parse_mpls_push,
94 };
95
96 struct mlx5e_tc_act mlx5e_tc_act_mpls_pop = {
97 .can_offload = tc_act_can_offload_mpls_pop,
98 .parse_action = tc_act_parse_mpls_pop,
99 };
100