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				  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		+ 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
99static 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
149const 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
163const 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 */
180static 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
208static 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
221static 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
243static 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
308int 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
356out_ops:
357	ethnl_ops_complete(dev);
358out_rtnl:
359	rtnl_unlock();
360out_dev:
361	dev_put(dev);
362	return ret;
363}
364