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
9struct linkmodes_req_info {
10	struct ethnl_req_info		base;
11};
12
13struct 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
23const struct nla_policy ethnl_linkmodes_get_policy[] = {
24	[ETHTOOL_A_LINKMODES_HEADER]		=
25		NLA_POLICY_NESTED(ethnl_header_policy),
26};
27
28static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
29				  struct ethnl_reply_data *reply_base,
30				  const 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
55out:
56	ethnl_ops_complete(dev);
57	return ret;
58}
59
60static 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
100static 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/* LINKMODES_SET */
155
156const struct nla_policy ethnl_linkmodes_set_policy[] = {
157	[ETHTOOL_A_LINKMODES_HEADER]		=
158		NLA_POLICY_NESTED(ethnl_header_policy),
159	[ETHTOOL_A_LINKMODES_AUTONEG]		= { .type = NLA_U8 },
160	[ETHTOOL_A_LINKMODES_OURS]		= { .type = NLA_NESTED },
161	[ETHTOOL_A_LINKMODES_SPEED]		= { .type = NLA_U32 },
162	[ETHTOOL_A_LINKMODES_DUPLEX]		= { .type = NLA_U8 },
163	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]	= { .type = NLA_U8 },
164	[ETHTOOL_A_LINKMODES_LANES]		= NLA_POLICY_RANGE(NLA_U32, 1, 8),
165};
166
167/* Set advertised link modes to all supported modes matching requested speed,
168 * lanes and duplex values. Called when autonegotiation is on, speed, lanes or
169 * duplex is requested but no link mode change. This is done in userspace with
170 * ioctl() interface, move it into kernel for netlink.
171 * Returns true if advertised modes bitmap was modified.
172 */
173static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
174				 bool req_speed, bool req_lanes, bool req_duplex)
175{
176	unsigned long *advertising = ksettings->link_modes.advertising;
177	unsigned long *supported = ksettings->link_modes.supported;
178	DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS);
179	unsigned int i;
180
181	bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
182
183	for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
184		const struct link_mode_info *info = &link_mode_params[i];
185
186		if (info->speed == SPEED_UNKNOWN)
187			continue;
188		if (test_bit(i, supported) &&
189		    (!req_speed || info->speed == ksettings->base.speed) &&
190		    (!req_lanes || info->lanes == ksettings->lanes) &&
191		    (!req_duplex || info->duplex == ksettings->base.duplex))
192			set_bit(i, advertising);
193		else
194			clear_bit(i, advertising);
195	}
196
197	return !bitmap_equal(old_adv, advertising,
198			     __ETHTOOL_LINK_MODE_MASK_NBITS);
199}
200
201static bool ethnl_validate_master_slave_cfg(u8 cfg)
202{
203	switch (cfg) {
204	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
205	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
206	case MASTER_SLAVE_CFG_MASTER_FORCE:
207	case MASTER_SLAVE_CFG_SLAVE_FORCE:
208		return true;
209	}
210
211	return false;
212}
213
214static int ethnl_check_linkmodes(struct genl_info *info, struct nlattr **tb)
215{
216	const struct nlattr *master_slave_cfg, *lanes_cfg;
217
218	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
219	if (master_slave_cfg &&
220	    !ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) {
221		NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
222				    "master/slave value is invalid");
223		return -EOPNOTSUPP;
224	}
225
226	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
227	if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) {
228		NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
229				    "lanes value is invalid");
230		return -EINVAL;
231	}
232
233	return 0;
234}
235
236static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
237				  struct ethtool_link_ksettings *ksettings,
238				  bool *mod, const struct net_device *dev)
239{
240	struct ethtool_link_settings *lsettings = &ksettings->base;
241	bool req_speed, req_lanes, req_duplex;
242	const struct nlattr *master_slave_cfg, *lanes_cfg;
243	int ret;
244
245	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
246	if (master_slave_cfg) {
247		if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
248			NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
249					    "master/slave configuration not supported by device");
250			return -EOPNOTSUPP;
251		}
252	}
253
254	*mod = false;
255	req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
256	req_lanes = tb[ETHTOOL_A_LINKMODES_LANES];
257	req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
258
259	ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG],
260			mod);
261
262	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
263	if (lanes_cfg) {
264		/* If autoneg is off and lanes parameter is not supported by the
265		 * driver, return an error.
266		 */
267		if (!lsettings->autoneg &&
268		    !dev->ethtool_ops->cap_link_lanes_supported) {
269			NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
270					    "lanes configuration not supported by device");
271			return -EOPNOTSUPP;
272		}
273	} else if (!lsettings->autoneg && ksettings->lanes) {
274		/* If autoneg is off and lanes parameter is not passed from user but
275		 * it was defined previously then set the lanes parameter to 0.
276		 */
277		ksettings->lanes = 0;
278		*mod = true;
279	}
280
281	ret = ethnl_update_bitset(ksettings->link_modes.advertising,
282				  __ETHTOOL_LINK_MODE_MASK_NBITS,
283				  tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names,
284				  info->extack, mod);
285	if (ret < 0)
286		return ret;
287	ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED],
288			 mod);
289	ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod);
290	ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
291			mod);
292	ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);
293
294	if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
295	    (req_speed || req_lanes || req_duplex) &&
296	    ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex))
297		*mod = true;
298
299	return 0;
300}
301
302static int
303ethnl_set_linkmodes_validate(struct ethnl_req_info *req_info,
304			     struct genl_info *info)
305{
306	const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
307	int ret;
308
309	ret = ethnl_check_linkmodes(info, info->attrs);
310	if (ret < 0)
311		return ret;
312
313	if (!ops->get_link_ksettings || !ops->set_link_ksettings)
314		return -EOPNOTSUPP;
315	return 1;
316}
317
318static int
319ethnl_set_linkmodes(struct ethnl_req_info *req_info, struct genl_info *info)
320{
321	struct ethtool_link_ksettings ksettings = {};
322	struct net_device *dev = req_info->dev;
323	struct nlattr **tb = info->attrs;
324	bool mod = false;
325	int ret;
326
327	ret = __ethtool_get_link_ksettings(dev, &ksettings);
328	if (ret < 0) {
329		GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
330		return ret;
331	}
332
333	ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev);
334	if (ret < 0)
335		return ret;
336	if (!mod)
337		return 0;
338
339	ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
340	if (ret < 0) {
341		GENL_SET_ERR_MSG(info, "link settings update failed");
342		return ret;
343	}
344
345	return 1;
346}
347
348const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
349	.request_cmd		= ETHTOOL_MSG_LINKMODES_GET,
350	.reply_cmd		= ETHTOOL_MSG_LINKMODES_GET_REPLY,
351	.hdr_attr		= ETHTOOL_A_LINKMODES_HEADER,
352	.req_info_size		= sizeof(struct linkmodes_req_info),
353	.reply_data_size	= sizeof(struct linkmodes_reply_data),
354
355	.prepare_data		= linkmodes_prepare_data,
356	.reply_size		= linkmodes_reply_size,
357	.fill_reply		= linkmodes_fill_reply,
358
359	.set_validate		= ethnl_set_linkmodes_validate,
360	.set			= ethnl_set_linkmodes,
361	.set_ntf_cmd		= ETHTOOL_MSG_LINKMODES_NTF,
362};
363