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/export.h>
15#include <linux/phy.h>
16
17struct pse_req_info {
18 struct ethnl_req_info base;
19};
20
21struct pse_reply_data {
22 struct ethnl_reply_data base;
23 struct ethtool_pse_control_status status;
24};
25
26#define PSE_REPDATA(__reply_base) \
27 container_of(__reply_base, struct pse_reply_data, base)
28
29/* PSE_GET */
30
31const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1] = {
32 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy),
33};
34
35static int pse_get_pse_attributes(struct phy_device *phydev,
36 struct netlink_ext_ack *extack,
37 struct pse_reply_data *data)
38{
39 if (!phydev) {
40 NL_SET_ERR_MSG(extack, "No PHY found");
41 return -EOPNOTSUPP;
42 }
43
44 if (!phydev->psec) {
45 NL_SET_ERR_MSG(extack, "No PSE is attached");
46 return -EOPNOTSUPP;
47 }
48
49 memset(&data->status, 0, sizeof(data->status));
50
51 return pse_ethtool_get_status(psec: phydev->psec, extack, status: &data->status);
52}
53
54static int pse_prepare_data(const struct ethnl_req_info *req_base,
55 struct ethnl_reply_data *reply_base,
56 const struct genl_info *info)
57{
58 struct pse_reply_data *data = PSE_REPDATA(reply_base);
59 struct net_device *dev = reply_base->dev;
60 struct nlattr **tb = info->attrs;
61 struct phy_device *phydev;
62 int ret;
63
64 ret = ethnl_ops_begin(dev);
65 if (ret < 0)
66 return ret;
67
68 phydev = ethnl_req_get_phydev(req_info: req_base, tb, header: ETHTOOL_A_PSE_HEADER,
69 extack: info->extack);
70 if (IS_ERR(ptr: phydev))
71 return -ENODEV;
72
73 ret = pse_get_pse_attributes(phydev, extack: info->extack, data);
74
75 ethnl_ops_complete(dev);
76
77 return ret;
78}
79
80static int pse_reply_size(const struct ethnl_req_info *req_base,
81 const struct ethnl_reply_data *reply_base)
82{
83 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
84 const struct ethtool_pse_control_status *st = &data->status;
85 int len = 0;
86
87 if (st->pw_d_id)
88 len += nla_total_size(payload: sizeof(u32)); /* _PSE_PW_D_ID */
89 if (st->podl_admin_state > 0)
90 len += nla_total_size(payload: sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */
91 if (st->podl_pw_status > 0)
92 len += nla_total_size(payload: sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */
93 if (st->c33_admin_state > 0)
94 len += nla_total_size(payload: sizeof(u32)); /* _C33_PSE_ADMIN_STATE */
95 if (st->c33_pw_status > 0)
96 len += nla_total_size(payload: sizeof(u32)); /* _C33_PSE_PW_D_STATUS */
97 if (st->c33_pw_class > 0)
98 len += nla_total_size(payload: sizeof(u32)); /* _C33_PSE_PW_CLASS */
99 if (st->c33_actual_pw > 0)
100 len += nla_total_size(payload: sizeof(u32)); /* _C33_PSE_ACTUAL_PW */
101 if (st->c33_ext_state_info.c33_pse_ext_state > 0) {
102 len += nla_total_size(payload: sizeof(u32)); /* _C33_PSE_EXT_STATE */
103 if (st->c33_ext_state_info.__c33_pse_ext_substate > 0)
104 /* _C33_PSE_EXT_SUBSTATE */
105 len += nla_total_size(payload: sizeof(u32));
106 }
107 if (st->c33_avail_pw_limit > 0)
108 /* _C33_AVAIL_PSE_PW_LIMIT */
109 len += nla_total_size(payload: sizeof(u32));
110 if (st->c33_pw_limit_nb_ranges > 0)
111 /* _C33_PSE_PW_LIMIT_RANGES */
112 len += st->c33_pw_limit_nb_ranges *
113 (nla_total_size(payload: 0) +
114 nla_total_size(payload: sizeof(u32)) * 2);
115 if (st->prio_max)
116 /* _PSE_PRIO_MAX + _PSE_PRIO */
117 len += nla_total_size(payload: sizeof(u32)) * 2;
118
119 return len;
120}
121
122static int pse_put_pw_limit_ranges(struct sk_buff *skb,
123 const struct ethtool_pse_control_status *st)
124{
125 const struct ethtool_c33_pse_pw_limit_range *pw_limit_ranges;
126 int i;
127
128 pw_limit_ranges = st->c33_pw_limit_ranges;
129 for (i = 0; i < st->c33_pw_limit_nb_ranges; i++) {
130 struct nlattr *nest;
131
132 nest = nla_nest_start(skb, attrtype: ETHTOOL_A_C33_PSE_PW_LIMIT_RANGES);
133 if (!nest)
134 return -EMSGSIZE;
135
136 if (nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_PW_LIMIT_MIN,
137 value: pw_limit_ranges->min) ||
138 nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_PW_LIMIT_MAX,
139 value: pw_limit_ranges->max)) {
140 nla_nest_cancel(skb, start: nest);
141 return -EMSGSIZE;
142 }
143 nla_nest_end(skb, start: nest);
144 pw_limit_ranges++;
145 }
146
147 return 0;
148}
149
150static int pse_fill_reply(struct sk_buff *skb,
151 const struct ethnl_req_info *req_base,
152 const struct ethnl_reply_data *reply_base)
153{
154 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
155 const struct ethtool_pse_control_status *st = &data->status;
156
157 if (st->pw_d_id &&
158 nla_put_u32(skb, attrtype: ETHTOOL_A_PSE_PW_D_ID,
159 value: st->pw_d_id))
160 return -EMSGSIZE;
161
162 if (st->podl_admin_state > 0 &&
163 nla_put_u32(skb, attrtype: ETHTOOL_A_PODL_PSE_ADMIN_STATE,
164 value: st->podl_admin_state))
165 return -EMSGSIZE;
166
167 if (st->podl_pw_status > 0 &&
168 nla_put_u32(skb, attrtype: ETHTOOL_A_PODL_PSE_PW_D_STATUS,
169 value: st->podl_pw_status))
170 return -EMSGSIZE;
171
172 if (st->c33_admin_state > 0 &&
173 nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_ADMIN_STATE,
174 value: st->c33_admin_state))
175 return -EMSGSIZE;
176
177 if (st->c33_pw_status > 0 &&
178 nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_PW_D_STATUS,
179 value: st->c33_pw_status))
180 return -EMSGSIZE;
181
182 if (st->c33_pw_class > 0 &&
183 nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_PW_CLASS,
184 value: st->c33_pw_class))
185 return -EMSGSIZE;
186
187 if (st->c33_actual_pw > 0 &&
188 nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_ACTUAL_PW,
189 value: st->c33_actual_pw))
190 return -EMSGSIZE;
191
192 if (st->c33_ext_state_info.c33_pse_ext_state > 0) {
193 if (nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_EXT_STATE,
194 value: st->c33_ext_state_info.c33_pse_ext_state))
195 return -EMSGSIZE;
196
197 if (st->c33_ext_state_info.__c33_pse_ext_substate > 0 &&
198 nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_EXT_SUBSTATE,
199 value: st->c33_ext_state_info.__c33_pse_ext_substate))
200 return -EMSGSIZE;
201 }
202
203 if (st->c33_avail_pw_limit > 0 &&
204 nla_put_u32(skb, attrtype: ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT,
205 value: st->c33_avail_pw_limit))
206 return -EMSGSIZE;
207
208 if (st->c33_pw_limit_nb_ranges > 0 &&
209 pse_put_pw_limit_ranges(skb, st))
210 return -EMSGSIZE;
211
212 if (st->prio_max &&
213 (nla_put_u32(skb, attrtype: ETHTOOL_A_PSE_PRIO_MAX, value: st->prio_max) ||
214 nla_put_u32(skb, attrtype: ETHTOOL_A_PSE_PRIO, value: st->prio)))
215 return -EMSGSIZE;
216
217 return 0;
218}
219
220static void pse_cleanup_data(struct ethnl_reply_data *reply_base)
221{
222 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
223
224 kfree(objp: data->status.c33_pw_limit_ranges);
225}
226
227/* PSE_SET */
228
229const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
230 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy),
231 [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] =
232 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED,
233 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED),
234 [ETHTOOL_A_C33_PSE_ADMIN_CONTROL] =
235 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
236 ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED),
237 [ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT] = { .type = NLA_U32 },
238 [ETHTOOL_A_PSE_PRIO] = { .type = NLA_U32 },
239};
240
241static int
242ethnl_set_pse_validate(struct phy_device *phydev, struct genl_info *info)
243{
244 struct nlattr **tb = info->attrs;
245
246 if (IS_ERR_OR_NULL(ptr: phydev)) {
247 NL_SET_ERR_MSG(info->extack, "No PHY is attached");
248 return -EOPNOTSUPP;
249 }
250
251 if (!phydev->psec) {
252 NL_SET_ERR_MSG(info->extack, "No PSE is attached");
253 return -EOPNOTSUPP;
254 }
255
256 if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] &&
257 !pse_has_podl(psec: phydev->psec)) {
258 NL_SET_ERR_MSG_ATTR(info->extack,
259 tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL],
260 "setting PoDL PSE admin control not supported");
261 return -EOPNOTSUPP;
262 }
263 if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] &&
264 !pse_has_c33(psec: phydev->psec)) {
265 NL_SET_ERR_MSG_ATTR(info->extack,
266 tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL],
267 "setting C33 PSE admin control not supported");
268 return -EOPNOTSUPP;
269 }
270
271 return 0;
272}
273
274static int
275ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
276{
277 struct nlattr **tb = info->attrs;
278 struct phy_device *phydev;
279 int ret;
280
281 phydev = ethnl_req_get_phydev(req_info, tb, header: ETHTOOL_A_PSE_HEADER,
282 extack: info->extack);
283 ret = ethnl_set_pse_validate(phydev, info);
284 if (ret)
285 return ret;
286
287 if (tb[ETHTOOL_A_PSE_PRIO]) {
288 unsigned int prio;
289
290 prio = nla_get_u32(nla: tb[ETHTOOL_A_PSE_PRIO]);
291 ret = pse_ethtool_set_prio(psec: phydev->psec, extack: info->extack, prio);
292 if (ret)
293 return ret;
294 }
295
296 if (tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]) {
297 unsigned int pw_limit;
298
299 pw_limit = nla_get_u32(nla: tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]);
300 ret = pse_ethtool_set_pw_limit(psec: phydev->psec, extack: info->extack,
301 pw_limit);
302 if (ret)
303 return ret;
304 }
305
306 /* These values are already validated by the ethnl_pse_set_policy */
307 if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] ||
308 tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]) {
309 struct pse_control_config config = {};
310
311 if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL])
312 config.podl_admin_control = nla_get_u32(nla: tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
313 if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL])
314 config.c33_admin_control = nla_get_u32(nla: tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
315
316 /* pse_ethtool_set_config() will do nothing if the config
317 * is zero
318 */
319 ret = pse_ethtool_set_config(psec: phydev->psec, extack: info->extack,
320 config: &config);
321 if (ret)
322 return ret;
323 }
324
325 /* Return errno or zero - PSE has no notification */
326 return ret;
327}
328
329const struct ethnl_request_ops ethnl_pse_request_ops = {
330 .request_cmd = ETHTOOL_MSG_PSE_GET,
331 .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY,
332 .hdr_attr = ETHTOOL_A_PSE_HEADER,
333 .req_info_size = sizeof(struct pse_req_info),
334 .reply_data_size = sizeof(struct pse_reply_data),
335
336 .prepare_data = pse_prepare_data,
337 .reply_size = pse_reply_size,
338 .fill_reply = pse_fill_reply,
339 .cleanup_data = pse_cleanup_data,
340
341 .set = ethnl_set_pse,
342 /* PSE has no notification */
343};
344
345void ethnl_pse_send_ntf(struct net_device *netdev, unsigned long notifs)
346{
347 void *reply_payload;
348 struct sk_buff *skb;
349 int reply_len;
350 int ret;
351
352 ASSERT_RTNL();
353
354 if (!netdev || !notifs)
355 return;
356
357 reply_len = ethnl_reply_header_size() +
358 nla_total_size(payload: sizeof(u32)); /* _PSE_NTF_EVENTS */
359
360 skb = genlmsg_new(payload: reply_len, GFP_KERNEL);
361 if (!skb)
362 return;
363
364 reply_payload = ethnl_bcastmsg_put(skb, cmd: ETHTOOL_MSG_PSE_NTF);
365 if (!reply_payload)
366 goto err_skb;
367
368 ret = ethnl_fill_reply_header(skb, dev: netdev, attrtype: ETHTOOL_A_PSE_NTF_HEADER);
369 if (ret < 0)
370 goto err_skb;
371
372 if (nla_put_uint(skb, attrtype: ETHTOOL_A_PSE_NTF_EVENTS, value: notifs))
373 goto err_skb;
374
375 genlmsg_end(skb, hdr: reply_payload);
376 ethnl_multicast(skb, dev: netdev);
377 return;
378
379err_skb:
380 nlmsg_free(skb);
381}
382EXPORT_SYMBOL_GPL(ethnl_pse_send_ntf);
383

source code of linux/net/ethtool/pse-pd.c