1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include "netlink.h"
4 #include "common.h"
5 #include "bitset.h"
6
7 /* LINKMODES_GET */
8
9 struct linkmodes_req_info {
10 struct ethnl_req_info base;
11 };
12
13 struct linkmodes_reply_data {
14 struct ethnl_reply_data base;
15 struct ethtool_link_ksettings ksettings;
16 struct ethtool_link_settings *lsettings;
17 bool peer_empty;
18 };
19
20 #define LINKMODES_REPDATA(__reply_base) \
21 container_of(__reply_base, struct linkmodes_reply_data, base)
22
23 const struct nla_policy ethnl_linkmodes_get_policy[] = {
24 [ETHTOOL_A_LINKMODES_HEADER] =
25 NLA_POLICY_NESTED(ethnl_header_policy),
26 };
27
linkmodes_prepare_data(const struct ethnl_req_info * req_base,struct ethnl_reply_data * reply_base,struct genl_info * info)28 static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
29 struct ethnl_reply_data *reply_base,
30 struct genl_info *info)
31 {
32 struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
33 struct net_device *dev = reply_base->dev;
34 int ret;
35
36 data->lsettings = &data->ksettings.base;
37
38 ret = ethnl_ops_begin(dev);
39 if (ret < 0)
40 return ret;
41
42 ret = __ethtool_get_link_ksettings(dev, &data->ksettings);
43 if (ret < 0 && info) {
44 GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
45 goto out;
46 }
47
48 if (!dev->ethtool_ops->cap_link_lanes_supported)
49 data->ksettings.lanes = 0;
50
51 data->peer_empty =
52 bitmap_empty(data->ksettings.link_modes.lp_advertising,
53 __ETHTOOL_LINK_MODE_MASK_NBITS);
54
55 out:
56 ethnl_ops_complete(dev);
57 return ret;
58 }
59
linkmodes_reply_size(const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)60 static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
61 const struct ethnl_reply_data *reply_base)
62 {
63 const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
64 const struct ethtool_link_ksettings *ksettings = &data->ksettings;
65 const struct ethtool_link_settings *lsettings = &ksettings->base;
66 bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
67 int len, ret;
68
69 len = nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */
70 + nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */
71 + nla_total_size(sizeof(u32)) /* LINKMODES_LANES */
72 + nla_total_size(sizeof(u8)) /* LINKMODES_DUPLEX */
73 + 0;
74 ret = ethnl_bitset_size(ksettings->link_modes.advertising,
75 ksettings->link_modes.supported,
76 __ETHTOOL_LINK_MODE_MASK_NBITS,
77 link_mode_names, compact);
78 if (ret < 0)
79 return ret;
80 len += ret;
81 if (!data->peer_empty) {
82 ret = ethnl_bitset_size(ksettings->link_modes.lp_advertising,
83 NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
84 link_mode_names, compact);
85 if (ret < 0)
86 return ret;
87 len += ret;
88 }
89
90 if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED)
91 len += nla_total_size(sizeof(u8));
92
93 if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED)
94 len += nla_total_size(sizeof(u8));
95
96 return len;
97 }
98
linkmodes_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)99 static int linkmodes_fill_reply(struct sk_buff *skb,
100 const struct ethnl_req_info *req_base,
101 const struct ethnl_reply_data *reply_base)
102 {
103 const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
104 const struct ethtool_link_ksettings *ksettings = &data->ksettings;
105 const struct ethtool_link_settings *lsettings = &ksettings->base;
106 bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
107 int ret;
108
109 if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg))
110 return -EMSGSIZE;
111
112 ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_OURS,
113 ksettings->link_modes.advertising,
114 ksettings->link_modes.supported,
115 __ETHTOOL_LINK_MODE_MASK_NBITS, link_mode_names,
116 compact);
117 if (ret < 0)
118 return -EMSGSIZE;
119 if (!data->peer_empty) {
120 ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_PEER,
121 ksettings->link_modes.lp_advertising,
122 NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
123 link_mode_names, compact);
124 if (ret < 0)
125 return -EMSGSIZE;
126 }
127
128 if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) ||
129 nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
130 return -EMSGSIZE;
131
132 if (ksettings->lanes &&
133 nla_put_u32(skb, ETHTOOL_A_LINKMODES_LANES, ksettings->lanes))
134 return -EMSGSIZE;
135
136 if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED &&
137 nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
138 lsettings->master_slave_cfg))
139 return -EMSGSIZE;
140
141 if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED &&
142 nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE,
143 lsettings->master_slave_state))
144 return -EMSGSIZE;
145
146 return 0;
147 }
148
149 const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
150 .request_cmd = ETHTOOL_MSG_LINKMODES_GET,
151 .reply_cmd = ETHTOOL_MSG_LINKMODES_GET_REPLY,
152 .hdr_attr = ETHTOOL_A_LINKMODES_HEADER,
153 .req_info_size = sizeof(struct linkmodes_req_info),
154 .reply_data_size = sizeof(struct linkmodes_reply_data),
155
156 .prepare_data = linkmodes_prepare_data,
157 .reply_size = linkmodes_reply_size,
158 .fill_reply = linkmodes_fill_reply,
159 };
160
161 /* LINKMODES_SET */
162
163 const struct nla_policy ethnl_linkmodes_set_policy[] = {
164 [ETHTOOL_A_LINKMODES_HEADER] =
165 NLA_POLICY_NESTED(ethnl_header_policy),
166 [ETHTOOL_A_LINKMODES_AUTONEG] = { .type = NLA_U8 },
167 [ETHTOOL_A_LINKMODES_OURS] = { .type = NLA_NESTED },
168 [ETHTOOL_A_LINKMODES_SPEED] = { .type = NLA_U32 },
169 [ETHTOOL_A_LINKMODES_DUPLEX] = { .type = NLA_U8 },
170 [ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG] = { .type = NLA_U8 },
171 [ETHTOOL_A_LINKMODES_LANES] = NLA_POLICY_RANGE(NLA_U32, 1, 8),
172 };
173
174 /* Set advertised link modes to all supported modes matching requested speed,
175 * lanes and duplex values. Called when autonegotiation is on, speed, lanes or
176 * duplex is requested but no link mode change. This is done in userspace with
177 * ioctl() interface, move it into kernel for netlink.
178 * Returns true if advertised modes bitmap was modified.
179 */
ethnl_auto_linkmodes(struct ethtool_link_ksettings * ksettings,bool req_speed,bool req_lanes,bool req_duplex)180 static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
181 bool req_speed, bool req_lanes, bool req_duplex)
182 {
183 unsigned long *advertising = ksettings->link_modes.advertising;
184 unsigned long *supported = ksettings->link_modes.supported;
185 DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS);
186 unsigned int i;
187
188 bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
189
190 for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
191 const struct link_mode_info *info = &link_mode_params[i];
192
193 if (info->speed == SPEED_UNKNOWN)
194 continue;
195 if (test_bit(i, supported) &&
196 (!req_speed || info->speed == ksettings->base.speed) &&
197 (!req_lanes || info->lanes == ksettings->lanes) &&
198 (!req_duplex || info->duplex == ksettings->base.duplex))
199 set_bit(i, advertising);
200 else
201 clear_bit(i, advertising);
202 }
203
204 return !bitmap_equal(old_adv, advertising,
205 __ETHTOOL_LINK_MODE_MASK_NBITS);
206 }
207
ethnl_validate_master_slave_cfg(u8 cfg)208 static bool ethnl_validate_master_slave_cfg(u8 cfg)
209 {
210 switch (cfg) {
211 case MASTER_SLAVE_CFG_MASTER_PREFERRED:
212 case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
213 case MASTER_SLAVE_CFG_MASTER_FORCE:
214 case MASTER_SLAVE_CFG_SLAVE_FORCE:
215 return true;
216 }
217
218 return false;
219 }
220
ethnl_check_linkmodes(struct genl_info * info,struct nlattr ** tb)221 static int ethnl_check_linkmodes(struct genl_info *info, struct nlattr **tb)
222 {
223 const struct nlattr *master_slave_cfg, *lanes_cfg;
224
225 master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
226 if (master_slave_cfg &&
227 !ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) {
228 NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
229 "master/slave value is invalid");
230 return -EOPNOTSUPP;
231 }
232
233 lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
234 if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) {
235 NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
236 "lanes value is invalid");
237 return -EINVAL;
238 }
239
240 return 0;
241 }
242
ethnl_update_linkmodes(struct genl_info * info,struct nlattr ** tb,struct ethtool_link_ksettings * ksettings,bool * mod,const struct net_device * dev)243 static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
244 struct ethtool_link_ksettings *ksettings,
245 bool *mod, const struct net_device *dev)
246 {
247 struct ethtool_link_settings *lsettings = &ksettings->base;
248 bool req_speed, req_lanes, req_duplex;
249 const struct nlattr *master_slave_cfg, *lanes_cfg;
250 int ret;
251
252 master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
253 if (master_slave_cfg) {
254 if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
255 NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
256 "master/slave configuration not supported by device");
257 return -EOPNOTSUPP;
258 }
259 }
260
261 *mod = false;
262 req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
263 req_lanes = tb[ETHTOOL_A_LINKMODES_LANES];
264 req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
265
266 ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG],
267 mod);
268
269 lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
270 if (lanes_cfg) {
271 /* If autoneg is off and lanes parameter is not supported by the
272 * driver, return an error.
273 */
274 if (!lsettings->autoneg &&
275 !dev->ethtool_ops->cap_link_lanes_supported) {
276 NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
277 "lanes configuration not supported by device");
278 return -EOPNOTSUPP;
279 }
280 } else if (!lsettings->autoneg) {
281 /* If autoneg is off and lanes parameter is not passed from user,
282 * set the lanes parameter to 0.
283 */
284 ksettings->lanes = 0;
285 }
286
287 ret = ethnl_update_bitset(ksettings->link_modes.advertising,
288 __ETHTOOL_LINK_MODE_MASK_NBITS,
289 tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names,
290 info->extack, mod);
291 if (ret < 0)
292 return ret;
293 ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED],
294 mod);
295 ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod);
296 ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
297 mod);
298 ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);
299
300 if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
301 (req_speed || req_lanes || req_duplex) &&
302 ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex))
303 *mod = true;
304
305 return 0;
306 }
307
ethnl_set_linkmodes(struct sk_buff * skb,struct genl_info * info)308 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info)
309 {
310 struct ethtool_link_ksettings ksettings = {};
311 struct ethnl_req_info req_info = {};
312 struct nlattr **tb = info->attrs;
313 struct net_device *dev;
314 bool mod = false;
315 int ret;
316
317 ret = ethnl_check_linkmodes(info, tb);
318 if (ret < 0)
319 return ret;
320
321 ret = ethnl_parse_header_dev_get(&req_info,
322 tb[ETHTOOL_A_LINKMODES_HEADER],
323 genl_info_net(info), info->extack,
324 true);
325 if (ret < 0)
326 return ret;
327 dev = req_info.dev;
328 ret = -EOPNOTSUPP;
329 if (!dev->ethtool_ops->get_link_ksettings ||
330 !dev->ethtool_ops->set_link_ksettings)
331 goto out_dev;
332
333 rtnl_lock();
334 ret = ethnl_ops_begin(dev);
335 if (ret < 0)
336 goto out_rtnl;
337
338 ret = __ethtool_get_link_ksettings(dev, &ksettings);
339 if (ret < 0) {
340 GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
341 goto out_ops;
342 }
343
344 ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev);
345 if (ret < 0)
346 goto out_ops;
347
348 if (mod) {
349 ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
350 if (ret < 0)
351 GENL_SET_ERR_MSG(info, "link settings update failed");
352 else
353 ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
354 }
355
356 out_ops:
357 ethnl_ops_complete(dev);
358 out_rtnl:
359 rtnl_unlock();
360 out_dev:
361 dev_put(dev);
362 return ret;
363 }
364