Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2//
3// ethtool interface for Ethernet PSE (Power Sourcing Equipment)
4// and PD (Powered Device)
5//
6// Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
7//
8
9#include "common.h"
10#include "linux/pse-pd/pse.h"
11#include "netlink.h"
12#include <linux/ethtool_netlink.h>
13#include <linux/ethtool.h>
14#include <linux/phy.h>
15
16struct pse_req_info {
17 struct ethnl_req_info base;
18};
19
20struct pse_reply_data {
21 struct ethnl_reply_data base;
22 struct pse_control_status status;
23};
24
25#define PSE_REPDATA(__reply_base) \
26 container_of(__reply_base, struct pse_reply_data, base)
27
28/* PSE_GET */
29
30const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1] = {
31 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
32};
33
34static int pse_get_pse_attributes(struct net_device *dev,
35 struct netlink_ext_ack *extack,
36 struct pse_reply_data *data)
37{
38 struct phy_device *phydev = dev->phydev;
39
40 if (!phydev) {
41 NL_SET_ERR_MSG(extack, "No PHY is attached");
42 return -EOPNOTSUPP;
43 }
44
45 if (!phydev->psec) {
46 NL_SET_ERR_MSG(extack, "No PSE is attached");
47 return -EOPNOTSUPP;
48 }
49
50 memset(&data->status, 0, sizeof(data->status));
51
52 return pse_ethtool_get_status(phydev->psec, extack, &data->status);
53}
54
55static int pse_prepare_data(const struct ethnl_req_info *req_base,
56 struct ethnl_reply_data *reply_base,
57 const struct genl_info *info)
58{
59 struct pse_reply_data *data = PSE_REPDATA(reply_base);
60 struct net_device *dev = reply_base->dev;
61 int ret;
62
63 ret = ethnl_ops_begin(dev);
64 if (ret < 0)
65 return ret;
66
67 ret = pse_get_pse_attributes(dev, info->extack, data);
68
69 ethnl_ops_complete(dev);
70
71 return ret;
72}
73
74static int pse_reply_size(const struct ethnl_req_info *req_base,
75 const struct ethnl_reply_data *reply_base)
76{
77 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
78 const struct pse_control_status *st = &data->status;
79 int len = 0;
80
81 if (st->podl_admin_state > 0)
82 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */
83 if (st->podl_pw_status > 0)
84 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */
85 if (st->c33_admin_state > 0)
86 len += nla_total_size(sizeof(u32)); /* _C33_PSE_ADMIN_STATE */
87 if (st->c33_pw_status > 0)
88 len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_D_STATUS */
89
90 return len;
91}
92
93static int pse_fill_reply(struct sk_buff *skb,
94 const struct ethnl_req_info *req_base,
95 const struct ethnl_reply_data *reply_base)
96{
97 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
98 const struct pse_control_status *st = &data->status;
99
100 if (st->podl_admin_state > 0 &&
101 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_ADMIN_STATE,
102 st->podl_admin_state))
103 return -EMSGSIZE;
104
105 if (st->podl_pw_status > 0 &&
106 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_PW_D_STATUS,
107 st->podl_pw_status))
108 return -EMSGSIZE;
109
110 if (st->c33_admin_state > 0 &&
111 nla_put_u32(skb, ETHTOOL_A_C33_PSE_ADMIN_STATE,
112 st->c33_admin_state))
113 return -EMSGSIZE;
114
115 if (st->c33_pw_status > 0 &&
116 nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_D_STATUS,
117 st->c33_pw_status))
118 return -EMSGSIZE;
119
120 return 0;
121}
122
123/* PSE_SET */
124
125const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
126 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
127 [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] =
128 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED,
129 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED),
130 [ETHTOOL_A_C33_PSE_ADMIN_CONTROL] =
131 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
132 ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED),
133};
134
135static int
136ethnl_set_pse_validate(struct ethnl_req_info *req_info, struct genl_info *info)
137{
138 struct net_device *dev = req_info->dev;
139 struct nlattr **tb = info->attrs;
140 struct phy_device *phydev;
141
142 phydev = dev->phydev;
143 if (!phydev) {
144 NL_SET_ERR_MSG(info->extack, "No PHY is attached");
145 return -EOPNOTSUPP;
146 }
147
148 if (!phydev->psec) {
149 NL_SET_ERR_MSG(info->extack, "No PSE is attached");
150 return -EOPNOTSUPP;
151 }
152
153 if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] &&
154 !pse_has_podl(phydev->psec)) {
155 NL_SET_ERR_MSG_ATTR(info->extack,
156 tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL],
157 "setting PoDL PSE admin control not supported");
158 return -EOPNOTSUPP;
159 }
160 if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] &&
161 !pse_has_c33(phydev->psec)) {
162 NL_SET_ERR_MSG_ATTR(info->extack,
163 tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL],
164 "setting C33 PSE admin control not supported");
165 return -EOPNOTSUPP;
166 }
167
168 return 1;
169}
170
171static int
172ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
173{
174 struct net_device *dev = req_info->dev;
175 struct pse_control_config config = {};
176 struct nlattr **tb = info->attrs;
177 struct phy_device *phydev;
178
179 phydev = dev->phydev;
180 /* These values are already validated by the ethnl_pse_set_policy */
181 if (pse_has_podl(phydev->psec))
182 config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
183 if (pse_has_c33(phydev->psec))
184 config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
185
186 /* Return errno directly - PSE has no notification */
187 return pse_ethtool_set_config(phydev->psec, info->extack, &config);
188}
189
190const struct ethnl_request_ops ethnl_pse_request_ops = {
191 .request_cmd = ETHTOOL_MSG_PSE_GET,
192 .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY,
193 .hdr_attr = ETHTOOL_A_PSE_HEADER,
194 .req_info_size = sizeof(struct pse_req_info),
195 .reply_data_size = sizeof(struct pse_reply_data),
196
197 .prepare_data = pse_prepare_data,
198 .reply_size = pse_reply_size,
199 .fill_reply = pse_fill_reply,
200
201 .set_validate = ethnl_set_pse_validate,
202 .set = ethnl_set_pse,
203 /* PSE has no notification */
204};