1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
3
4#include <linux/if_vlan.h>
5#include "act.h"
6#include "pedit.h"
7#include "en/tc_priv.h"
8#include "en/mod_hdr.h"
9
10static int pedit_header_offsets[] = {
11	[FLOW_ACT_MANGLE_HDR_TYPE_ETH] = offsetof(struct pedit_headers, eth),
12	[FLOW_ACT_MANGLE_HDR_TYPE_IP4] = offsetof(struct pedit_headers, ip4),
13	[FLOW_ACT_MANGLE_HDR_TYPE_IP6] = offsetof(struct pedit_headers, ip6),
14	[FLOW_ACT_MANGLE_HDR_TYPE_TCP] = offsetof(struct pedit_headers, tcp),
15	[FLOW_ACT_MANGLE_HDR_TYPE_UDP] = offsetof(struct pedit_headers, udp),
16};
17
18#define pedit_header(_ph, _htype) ((void *)(_ph) + pedit_header_offsets[_htype])
19
20static int
21set_pedit_val(u8 hdr_type, u32 mask, u32 val, u32 offset,
22	      struct pedit_headers_action *hdrs,
23	      struct netlink_ext_ack *extack)
24{
25	u32 *curr_pmask, *curr_pval;
26
27	curr_pmask = (u32 *)(pedit_header(&hdrs->masks, hdr_type) + offset);
28	curr_pval  = (u32 *)(pedit_header(&hdrs->vals, hdr_type) + offset);
29
30	if (*curr_pmask & mask) { /* disallow acting twice on the same location */
31		NL_SET_ERR_MSG_MOD(extack,
32				   "curr_pmask and new mask same. Acting twice on same location");
33		goto out_err;
34	}
35
36	*curr_pmask |= mask;
37	*curr_pval  |= (val & mask);
38
39	return 0;
40
41out_err:
42	return -EOPNOTSUPP;
43}
44
45int
46mlx5e_tc_act_pedit_parse_action(struct mlx5e_priv *priv,
47				const struct flow_action_entry *act, int namespace,
48				struct pedit_headers_action *hdrs,
49				struct netlink_ext_ack *extack)
50{
51	u8 cmd = (act->id == FLOW_ACTION_MANGLE) ? TCA_PEDIT_KEY_EX_CMD_SET :
52						   TCA_PEDIT_KEY_EX_CMD_ADD;
53	u8 htype = act->mangle.htype;
54	int err = -EOPNOTSUPP;
55	u32 mask, val, offset;
56
57	if (htype == FLOW_ACT_MANGLE_UNSPEC) {
58		NL_SET_ERR_MSG_MOD(extack, "legacy pedit isn't offloaded");
59		goto out_err;
60	}
61
62	if (!mlx5e_mod_hdr_max_actions(priv->mdev, namespace)) {
63		NL_SET_ERR_MSG_MOD(extack, "The pedit offload action is not supported");
64		goto out_err;
65	}
66
67	mask = act->mangle.mask;
68	val = act->mangle.val;
69	offset = act->mangle.offset;
70
71	err = set_pedit_val(htype, ~mask, val, offset, &hdrs[cmd], extack);
72	if (err)
73		goto out_err;
74
75	hdrs[cmd].pedits++;
76
77	return 0;
78out_err:
79	return err;
80}
81
82static int
83tc_act_parse_pedit(struct mlx5e_tc_act_parse_state *parse_state,
84		   const struct flow_action_entry *act,
85		   struct mlx5e_priv *priv,
86		   struct mlx5_flow_attr *attr)
87{
88	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
89	struct mlx5e_tc_flow *flow = parse_state->flow;
90	enum mlx5_flow_namespace_type ns_type;
91	int err;
92
93	ns_type = mlx5e_get_flow_namespace(flow);
94
95	err = mlx5e_tc_act_pedit_parse_action(flow->priv, act, ns_type, attr->parse_attr->hdrs,
96					      parse_state->extack);
97	if (err)
98		return err;
99
100	attr->action |= MLX5_FLOW_CONTEXT_ACTION_MOD_HDR;
101
102	if (ns_type == MLX5_FLOW_NAMESPACE_FDB) {
103		esw_attr->split_count = esw_attr->out_count;
104		parse_state->if_count = 0;
105	}
106
107	return 0;
108}
109
110struct mlx5e_tc_act mlx5e_tc_act_pedit = {
111	.parse_action = tc_act_parse_pedit,
112};
113