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 		+ nla_total_size(sizeof(u8)) /* LINKMODES_RATE_MATCHING */
74 		+ 0;
75 	ret = ethnl_bitset_size(ksettings->link_modes.advertising,
76 				ksettings->link_modes.supported,
77 				__ETHTOOL_LINK_MODE_MASK_NBITS,
78 				link_mode_names, compact);
79 	if (ret < 0)
80 		return ret;
81 	len += ret;
82 	if (!data->peer_empty) {
83 		ret = ethnl_bitset_size(ksettings->link_modes.lp_advertising,
84 					NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
85 					link_mode_names, compact);
86 		if (ret < 0)
87 			return ret;
88 		len += ret;
89 	}
90 
91 	if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED)
92 		len += nla_total_size(sizeof(u8));
93 
94 	if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED)
95 		len += nla_total_size(sizeof(u8));
96 
97 	return len;
98 }
99 
linkmodes_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)100 static int linkmodes_fill_reply(struct sk_buff *skb,
101 				const struct ethnl_req_info *req_base,
102 				const struct ethnl_reply_data *reply_base)
103 {
104 	const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
105 	const struct ethtool_link_ksettings *ksettings = &data->ksettings;
106 	const struct ethtool_link_settings *lsettings = &ksettings->base;
107 	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
108 	int ret;
109 
110 	if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg))
111 		return -EMSGSIZE;
112 
113 	ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_OURS,
114 			       ksettings->link_modes.advertising,
115 			       ksettings->link_modes.supported,
116 			       __ETHTOOL_LINK_MODE_MASK_NBITS, link_mode_names,
117 			       compact);
118 	if (ret < 0)
119 		return -EMSGSIZE;
120 	if (!data->peer_empty) {
121 		ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_PEER,
122 				       ksettings->link_modes.lp_advertising,
123 				       NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
124 				       link_mode_names, compact);
125 		if (ret < 0)
126 			return -EMSGSIZE;
127 	}
128 
129 	if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) ||
130 	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
131 		return -EMSGSIZE;
132 
133 	if (ksettings->lanes &&
134 	    nla_put_u32(skb, ETHTOOL_A_LINKMODES_LANES, ksettings->lanes))
135 		return -EMSGSIZE;
136 
137 	if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED &&
138 	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
139 		       lsettings->master_slave_cfg))
140 		return -EMSGSIZE;
141 
142 	if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED &&
143 	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE,
144 		       lsettings->master_slave_state))
145 		return -EMSGSIZE;
146 
147 	if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_RATE_MATCHING,
148 		       lsettings->rate_matching))
149 		return -EMSGSIZE;
150 
151 	return 0;
152 }
153 
154 const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
155 	.request_cmd		= ETHTOOL_MSG_LINKMODES_GET,
156 	.reply_cmd		= ETHTOOL_MSG_LINKMODES_GET_REPLY,
157 	.hdr_attr		= ETHTOOL_A_LINKMODES_HEADER,
158 	.req_info_size		= sizeof(struct linkmodes_req_info),
159 	.reply_data_size	= sizeof(struct linkmodes_reply_data),
160 
161 	.prepare_data		= linkmodes_prepare_data,
162 	.reply_size		= linkmodes_reply_size,
163 	.fill_reply		= linkmodes_fill_reply,
164 };
165 
166 /* LINKMODES_SET */
167 
168 const struct nla_policy ethnl_linkmodes_set_policy[] = {
169 	[ETHTOOL_A_LINKMODES_HEADER]		=
170 		NLA_POLICY_NESTED(ethnl_header_policy),
171 	[ETHTOOL_A_LINKMODES_AUTONEG]		= { .type = NLA_U8 },
172 	[ETHTOOL_A_LINKMODES_OURS]		= { .type = NLA_NESTED },
173 	[ETHTOOL_A_LINKMODES_SPEED]		= { .type = NLA_U32 },
174 	[ETHTOOL_A_LINKMODES_DUPLEX]		= { .type = NLA_U8 },
175 	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]	= { .type = NLA_U8 },
176 	[ETHTOOL_A_LINKMODES_LANES]		= NLA_POLICY_RANGE(NLA_U32, 1, 8),
177 };
178 
179 /* Set advertised link modes to all supported modes matching requested speed,
180  * lanes and duplex values. Called when autonegotiation is on, speed, lanes or
181  * duplex is requested but no link mode change. This is done in userspace with
182  * ioctl() interface, move it into kernel for netlink.
183  * Returns true if advertised modes bitmap was modified.
184  */
ethnl_auto_linkmodes(struct ethtool_link_ksettings * ksettings,bool req_speed,bool req_lanes,bool req_duplex)185 static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
186 				 bool req_speed, bool req_lanes, bool req_duplex)
187 {
188 	unsigned long *advertising = ksettings->link_modes.advertising;
189 	unsigned long *supported = ksettings->link_modes.supported;
190 	DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS);
191 	unsigned int i;
192 
193 	bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
194 
195 	for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
196 		const struct link_mode_info *info = &link_mode_params[i];
197 
198 		if (info->speed == SPEED_UNKNOWN)
199 			continue;
200 		if (test_bit(i, supported) &&
201 		    (!req_speed || info->speed == ksettings->base.speed) &&
202 		    (!req_lanes || info->lanes == ksettings->lanes) &&
203 		    (!req_duplex || info->duplex == ksettings->base.duplex))
204 			set_bit(i, advertising);
205 		else
206 			clear_bit(i, advertising);
207 	}
208 
209 	return !bitmap_equal(old_adv, advertising,
210 			     __ETHTOOL_LINK_MODE_MASK_NBITS);
211 }
212 
ethnl_validate_master_slave_cfg(u8 cfg)213 static bool ethnl_validate_master_slave_cfg(u8 cfg)
214 {
215 	switch (cfg) {
216 	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
217 	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
218 	case MASTER_SLAVE_CFG_MASTER_FORCE:
219 	case MASTER_SLAVE_CFG_SLAVE_FORCE:
220 		return true;
221 	}
222 
223 	return false;
224 }
225 
ethnl_check_linkmodes(struct genl_info * info,struct nlattr ** tb)226 static int ethnl_check_linkmodes(struct genl_info *info, struct nlattr **tb)
227 {
228 	const struct nlattr *master_slave_cfg, *lanes_cfg;
229 
230 	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
231 	if (master_slave_cfg &&
232 	    !ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) {
233 		NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
234 				    "master/slave value is invalid");
235 		return -EOPNOTSUPP;
236 	}
237 
238 	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
239 	if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) {
240 		NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
241 				    "lanes value is invalid");
242 		return -EINVAL;
243 	}
244 
245 	return 0;
246 }
247 
ethnl_update_linkmodes(struct genl_info * info,struct nlattr ** tb,struct ethtool_link_ksettings * ksettings,bool * mod,const struct net_device * dev)248 static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
249 				  struct ethtool_link_ksettings *ksettings,
250 				  bool *mod, const struct net_device *dev)
251 {
252 	struct ethtool_link_settings *lsettings = &ksettings->base;
253 	bool req_speed, req_lanes, req_duplex;
254 	const struct nlattr *master_slave_cfg, *lanes_cfg;
255 	int ret;
256 
257 	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
258 	if (master_slave_cfg) {
259 		if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
260 			NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
261 					    "master/slave configuration not supported by device");
262 			return -EOPNOTSUPP;
263 		}
264 	}
265 
266 	*mod = false;
267 	req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
268 	req_lanes = tb[ETHTOOL_A_LINKMODES_LANES];
269 	req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
270 
271 	ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG],
272 			mod);
273 
274 	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
275 	if (lanes_cfg) {
276 		/* If autoneg is off and lanes parameter is not supported by the
277 		 * driver, return an error.
278 		 */
279 		if (!lsettings->autoneg &&
280 		    !dev->ethtool_ops->cap_link_lanes_supported) {
281 			NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
282 					    "lanes configuration not supported by device");
283 			return -EOPNOTSUPP;
284 		}
285 	} else if (!lsettings->autoneg) {
286 		/* If autoneg is off and lanes parameter is not passed from user,
287 		 * set the lanes parameter to 0.
288 		 */
289 		ksettings->lanes = 0;
290 	}
291 
292 	ret = ethnl_update_bitset(ksettings->link_modes.advertising,
293 				  __ETHTOOL_LINK_MODE_MASK_NBITS,
294 				  tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names,
295 				  info->extack, mod);
296 	if (ret < 0)
297 		return ret;
298 	ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED],
299 			 mod);
300 	ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod);
301 	ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
302 			mod);
303 	ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);
304 
305 	if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
306 	    (req_speed || req_lanes || req_duplex) &&
307 	    ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex))
308 		*mod = true;
309 
310 	return 0;
311 }
312 
ethnl_set_linkmodes(struct sk_buff * skb,struct genl_info * info)313 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info)
314 {
315 	struct ethtool_link_ksettings ksettings = {};
316 	struct ethnl_req_info req_info = {};
317 	struct nlattr **tb = info->attrs;
318 	struct net_device *dev;
319 	bool mod = false;
320 	int ret;
321 
322 	ret = ethnl_check_linkmodes(info, tb);
323 	if (ret < 0)
324 		return ret;
325 
326 	ret = ethnl_parse_header_dev_get(&req_info,
327 					 tb[ETHTOOL_A_LINKMODES_HEADER],
328 					 genl_info_net(info), info->extack,
329 					 true);
330 	if (ret < 0)
331 		return ret;
332 	dev = req_info.dev;
333 	ret = -EOPNOTSUPP;
334 	if (!dev->ethtool_ops->get_link_ksettings ||
335 	    !dev->ethtool_ops->set_link_ksettings)
336 		goto out_dev;
337 
338 	rtnl_lock();
339 	ret = ethnl_ops_begin(dev);
340 	if (ret < 0)
341 		goto out_rtnl;
342 
343 	ret = __ethtool_get_link_ksettings(dev, &ksettings);
344 	if (ret < 0) {
345 		GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
346 		goto out_ops;
347 	}
348 
349 	ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev);
350 	if (ret < 0)
351 		goto out_ops;
352 
353 	if (mod) {
354 		ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
355 		if (ret < 0)
356 			GENL_SET_ERR_MSG(info, "link settings update failed");
357 		else
358 			ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
359 	}
360 
361 out_ops:
362 	ethnl_ops_complete(dev);
363 out_rtnl:
364 	rtnl_unlock();
365 out_dev:
366 	ethnl_parse_header_dev_put(&req_info);
367 	return ret;
368 }
369