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
16 struct pse_req_info {
17 struct ethnl_req_info base;
18 };
19
20 struct 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
30 const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1] = {
31 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy),
32 };
33
pse_get_pse_attributes(struct phy_device * phydev,struct netlink_ext_ack * extack,struct pse_reply_data * data)34 static int pse_get_pse_attributes(struct phy_device *phydev,
35 struct netlink_ext_ack *extack,
36 struct pse_reply_data *data)
37 {
38 if (!phydev) {
39 NL_SET_ERR_MSG(extack, "No PHY found");
40 return -EOPNOTSUPP;
41 }
42
43 if (!phydev->psec) {
44 NL_SET_ERR_MSG(extack, "No PSE is attached");
45 return -EOPNOTSUPP;
46 }
47
48 memset(&data->status, 0, sizeof(data->status));
49
50 return pse_ethtool_get_status(phydev->psec, extack, &data->status);
51 }
52
pse_prepare_data(const struct ethnl_req_info * req_base,struct ethnl_reply_data * reply_base,const struct genl_info * info)53 static int pse_prepare_data(const struct ethnl_req_info *req_base,
54 struct ethnl_reply_data *reply_base,
55 const struct genl_info *info)
56 {
57 struct pse_reply_data *data = PSE_REPDATA(reply_base);
58 struct net_device *dev = reply_base->dev;
59 struct nlattr **tb = info->attrs;
60 struct phy_device *phydev;
61 int ret;
62
63 ret = ethnl_ops_begin(dev);
64 if (ret < 0)
65 return ret;
66
67 phydev = ethnl_req_get_phydev(req_base, tb[ETHTOOL_A_PSE_HEADER],
68 info->extack);
69 if (IS_ERR(phydev))
70 return -ENODEV;
71
72 ret = pse_get_pse_attributes(phydev, info->extack, data);
73
74 ethnl_ops_complete(dev);
75
76 return ret;
77 }
78
pse_reply_size(const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)79 static int pse_reply_size(const struct ethnl_req_info *req_base,
80 const struct ethnl_reply_data *reply_base)
81 {
82 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
83 const struct pse_control_status *st = &data->status;
84 int len = 0;
85
86 if (st->podl_admin_state > 0)
87 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */
88 if (st->podl_pw_status > 0)
89 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */
90 if (st->c33_admin_state > 0)
91 len += nla_total_size(sizeof(u32)); /* _C33_PSE_ADMIN_STATE */
92 if (st->c33_pw_status > 0)
93 len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_D_STATUS */
94 if (st->c33_pw_class > 0)
95 len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_CLASS */
96 if (st->c33_actual_pw > 0)
97 len += nla_total_size(sizeof(u32)); /* _C33_PSE_ACTUAL_PW */
98 if (st->c33_ext_state_info.c33_pse_ext_state > 0) {
99 len += nla_total_size(sizeof(u32)); /* _C33_PSE_EXT_STATE */
100 if (st->c33_ext_state_info.__c33_pse_ext_substate > 0)
101 /* _C33_PSE_EXT_SUBSTATE */
102 len += nla_total_size(sizeof(u32));
103 }
104 if (st->c33_avail_pw_limit > 0)
105 /* _C33_AVAIL_PSE_PW_LIMIT */
106 len += nla_total_size(sizeof(u32));
107 if (st->c33_pw_limit_nb_ranges > 0)
108 /* _C33_PSE_PW_LIMIT_RANGES */
109 len += st->c33_pw_limit_nb_ranges *
110 (nla_total_size(0) +
111 nla_total_size(sizeof(u32)) * 2);
112
113 return len;
114 }
115
pse_put_pw_limit_ranges(struct sk_buff * skb,const struct pse_control_status * st)116 static int pse_put_pw_limit_ranges(struct sk_buff *skb,
117 const struct pse_control_status *st)
118 {
119 const struct ethtool_c33_pse_pw_limit_range *pw_limit_ranges;
120 int i;
121
122 pw_limit_ranges = st->c33_pw_limit_ranges;
123 for (i = 0; i < st->c33_pw_limit_nb_ranges; i++) {
124 struct nlattr *nest;
125
126 nest = nla_nest_start(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_RANGES);
127 if (!nest)
128 return -EMSGSIZE;
129
130 if (nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_MIN,
131 pw_limit_ranges->min) ||
132 nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_MAX,
133 pw_limit_ranges->max)) {
134 nla_nest_cancel(skb, nest);
135 return -EMSGSIZE;
136 }
137 nla_nest_end(skb, nest);
138 pw_limit_ranges++;
139 }
140
141 return 0;
142 }
143
pse_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)144 static int pse_fill_reply(struct sk_buff *skb,
145 const struct ethnl_req_info *req_base,
146 const struct ethnl_reply_data *reply_base)
147 {
148 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
149 const struct pse_control_status *st = &data->status;
150
151 if (st->podl_admin_state > 0 &&
152 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_ADMIN_STATE,
153 st->podl_admin_state))
154 return -EMSGSIZE;
155
156 if (st->podl_pw_status > 0 &&
157 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_PW_D_STATUS,
158 st->podl_pw_status))
159 return -EMSGSIZE;
160
161 if (st->c33_admin_state > 0 &&
162 nla_put_u32(skb, ETHTOOL_A_C33_PSE_ADMIN_STATE,
163 st->c33_admin_state))
164 return -EMSGSIZE;
165
166 if (st->c33_pw_status > 0 &&
167 nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_D_STATUS,
168 st->c33_pw_status))
169 return -EMSGSIZE;
170
171 if (st->c33_pw_class > 0 &&
172 nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_CLASS,
173 st->c33_pw_class))
174 return -EMSGSIZE;
175
176 if (st->c33_actual_pw > 0 &&
177 nla_put_u32(skb, ETHTOOL_A_C33_PSE_ACTUAL_PW,
178 st->c33_actual_pw))
179 return -EMSGSIZE;
180
181 if (st->c33_ext_state_info.c33_pse_ext_state > 0) {
182 if (nla_put_u32(skb, ETHTOOL_A_C33_PSE_EXT_STATE,
183 st->c33_ext_state_info.c33_pse_ext_state))
184 return -EMSGSIZE;
185
186 if (st->c33_ext_state_info.__c33_pse_ext_substate > 0 &&
187 nla_put_u32(skb, ETHTOOL_A_C33_PSE_EXT_SUBSTATE,
188 st->c33_ext_state_info.__c33_pse_ext_substate))
189 return -EMSGSIZE;
190 }
191
192 if (st->c33_avail_pw_limit > 0 &&
193 nla_put_u32(skb, ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT,
194 st->c33_avail_pw_limit))
195 return -EMSGSIZE;
196
197 if (st->c33_pw_limit_nb_ranges > 0 &&
198 pse_put_pw_limit_ranges(skb, st))
199 return -EMSGSIZE;
200
201 return 0;
202 }
203
pse_cleanup_data(struct ethnl_reply_data * reply_base)204 static void pse_cleanup_data(struct ethnl_reply_data *reply_base)
205 {
206 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
207
208 kfree(data->status.c33_pw_limit_ranges);
209 }
210
211 /* PSE_SET */
212
213 const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
214 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy),
215 [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] =
216 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED,
217 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED),
218 [ETHTOOL_A_C33_PSE_ADMIN_CONTROL] =
219 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
220 ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED),
221 [ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT] = { .type = NLA_U32 },
222 };
223
224 static int
ethnl_set_pse_validate(struct phy_device * phydev,struct genl_info * info)225 ethnl_set_pse_validate(struct phy_device *phydev, struct genl_info *info)
226 {
227 struct nlattr **tb = info->attrs;
228
229 if (IS_ERR_OR_NULL(phydev)) {
230 NL_SET_ERR_MSG(info->extack, "No PHY is attached");
231 return -EOPNOTSUPP;
232 }
233
234 if (!phydev->psec) {
235 NL_SET_ERR_MSG(info->extack, "No PSE is attached");
236 return -EOPNOTSUPP;
237 }
238
239 if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] &&
240 !pse_has_podl(phydev->psec)) {
241 NL_SET_ERR_MSG_ATTR(info->extack,
242 tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL],
243 "setting PoDL PSE admin control not supported");
244 return -EOPNOTSUPP;
245 }
246 if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] &&
247 !pse_has_c33(phydev->psec)) {
248 NL_SET_ERR_MSG_ATTR(info->extack,
249 tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL],
250 "setting C33 PSE admin control not supported");
251 return -EOPNOTSUPP;
252 }
253
254 return 0;
255 }
256
257 static int
ethnl_set_pse(struct ethnl_req_info * req_info,struct genl_info * info)258 ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
259 {
260 struct nlattr **tb = info->attrs;
261 struct phy_device *phydev;
262 int ret;
263
264 phydev = ethnl_req_get_phydev(req_info, tb[ETHTOOL_A_PSE_HEADER],
265 info->extack);
266 ret = ethnl_set_pse_validate(phydev, info);
267 if (ret)
268 return ret;
269
270 if (tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]) {
271 unsigned int pw_limit;
272
273 pw_limit = nla_get_u32(tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]);
274 ret = pse_ethtool_set_pw_limit(phydev->psec, info->extack,
275 pw_limit);
276 if (ret)
277 return ret;
278 }
279
280 /* These values are already validated by the ethnl_pse_set_policy */
281 if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] ||
282 tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]) {
283 struct pse_control_config config = {};
284
285 if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL])
286 config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
287 if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL])
288 config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
289
290 /* pse_ethtool_set_config() will do nothing if the config
291 * is zero
292 */
293 ret = pse_ethtool_set_config(phydev->psec, info->extack,
294 &config);
295 if (ret)
296 return ret;
297 }
298
299 /* Return errno or zero - PSE has no notification */
300 return ret;
301 }
302
303 const struct ethnl_request_ops ethnl_pse_request_ops = {
304 .request_cmd = ETHTOOL_MSG_PSE_GET,
305 .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY,
306 .hdr_attr = ETHTOOL_A_PSE_HEADER,
307 .req_info_size = sizeof(struct pse_req_info),
308 .reply_data_size = sizeof(struct pse_reply_data),
309
310 .prepare_data = pse_prepare_data,
311 .reply_size = pse_reply_size,
312 .fill_reply = pse_fill_reply,
313 .cleanup_data = pse_cleanup_data,
314
315 .set = ethnl_set_pse,
316 /* PSE has no notification */
317 };
318