summaryrefslogtreecommitdiffstats
path: root/net/ethtool/strset.c
blob: c678b484a07954891568fe2e2f38fe9ae7834590 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
// SPDX-License-Identifier: GPL-2.0-only

#include <linux/ethtool.h>
#include <linux/phy.h>
#include "netlink.h"
#include "common.h"

struct strset_info {
	bool per_dev;
	bool free_strings;
	unsigned int count;
	const char (*strings)[ETH_GSTRING_LEN];
};

static const struct strset_info info_template[] = {
	[ETH_SS_TEST] = {
		.per_dev	= true,
	},
	[ETH_SS_STATS] = {
		.per_dev	= true,
	},
	[ETH_SS_PRIV_FLAGS] = {
		.per_dev	= true,
	},
	[ETH_SS_FEATURES] = {
		.per_dev	= false,
		.count		= ARRAY_SIZE(netdev_features_strings),
		.strings	= netdev_features_strings,
	},
	[ETH_SS_RSS_HASH_FUNCS] = {
		.per_dev	= false,
		.count		= ARRAY_SIZE(rss_hash_func_strings),
		.strings	= rss_hash_func_strings,
	},
	[ETH_SS_TUNABLES] = {
		.per_dev	= false,
		.count		= ARRAY_SIZE(tunable_strings),
		.strings	= tunable_strings,
	},
	[ETH_SS_PHY_STATS] = {
		.per_dev	= true,
	},
	[ETH_SS_PHY_TUNABLES] = {
		.per_dev	= false,
		.count		= ARRAY_SIZE(phy_tunable_strings),
		.strings	= phy_tunable_strings,
	},
	[ETH_SS_LINK_MODES] = {
		.per_dev	= false,
		.count		= __ETHTOOL_LINK_MODE_MASK_NBITS,
		.strings	= link_mode_names,
	},
	[ETH_SS_MSG_CLASSES] = {
		.per_dev	= false,
		.count		= NETIF_MSG_CLASS_COUNT,
		.strings	= netif_msg_class_names,
	},
	[ETH_SS_WOL_MODES] = {
		.per_dev	= false,
		.count		= WOL_MODE_COUNT,
		.strings	= wol_mode_names,
	},
	[ETH_SS_SOF_TIMESTAMPING] = {
		.per_dev	= false,
		.count		= __SOF_TIMESTAMPING_CNT,
		.strings	= sof_timestamping_names,
	},
	[ETH_SS_TS_TX_TYPES] = {
		.per_dev	= false,
		.count		= __HWTSTAMP_TX_CNT,
		.strings	= ts_tx_type_names,
	},
	[ETH_SS_TS_RX_FILTERS] = {
		.per_dev	= false,
		.count		= __HWTSTAMP_FILTER_CNT,
		.strings	= ts_rx_filter_names,
	},
	[ETH_SS_UDP_TUNNEL_TYPES] = {
		.per_dev	= false,
		.count		= __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
		.strings	= udp_tunnel_type_names,
	},
	[ETH_SS_STATS_STD] = {
		.per_dev	= false,
		.count		= __ETHTOOL_STATS_CNT,
		.strings	= stats_std_names,
	},
	[ETH_SS_STATS_ETH_PHY] = {
		.per_dev	= false,
		.count		= __ETHTOOL_A_STATS_ETH_PHY_CNT,
		.strings	= stats_eth_phy_names,
	},
	[ETH_SS_STATS_ETH_MAC] = {
		.per_dev	= false,
		.count		= __ETHTOOL_A_STATS_ETH_MAC_CNT,
		.strings	= stats_eth_mac_names,
	},
	[ETH_SS_STATS_ETH_CTRL] = {
		.per_dev	= false,
		.count		= __ETHTOOL_A_STATS_ETH_CTRL_CNT,
		.strings	= stats_eth_ctrl_names,
	},
	[ETH_SS_STATS_RMON] = {
		.per_dev	= false,
		.count		= __ETHTOOL_A_STATS_RMON_CNT,
		.strings	= stats_rmon_names,
	},
};

struct strset_req_info {
	struct ethnl_req_info		base;
	u32				req_ids;
	bool				counts_only;
};

#define STRSET_REQINFO(__req_base) \
	container_of(__req_base, struct strset_req_info, base)

struct strset_reply_data {
	struct ethnl_reply_data		base;
	struct strset_info		sets[ETH_SS_COUNT];
};

#define STRSET_REPDATA(__reply_base) \
	container_of(__reply_base, struct strset_reply_data, base)

const struct nla_policy ethnl_strset_get_policy[] = {
	[ETHTOOL_A_STRSET_HEADER]	=
		NLA_POLICY_NESTED(ethnl_header_policy),
	[ETHTOOL_A_STRSET_STRINGSETS]	= { .type = NLA_NESTED },
	[ETHTOOL_A_STRSET_COUNTS_ONLY]	= { .type = NLA_FLAG },
};

static const struct nla_policy get_stringset_policy[] = {
	[ETHTOOL_A_STRINGSET_ID]	= { .type = NLA_U32 },
};

/**
 * strset_include() - test if a string set should be included in reply
 * @info: parsed client request
 * @data: pointer to request data structure
 * @id:   id of string set to check (ETH_SS_* constants)
 */
static bool strset_include(const struct strset_req_info *info,
			   const struct strset_reply_data *data, u32 id)
{
	bool per_dev;

	BUILD_BUG_ON(ETH_SS_COUNT >= BITS_PER_BYTE * sizeof(info->req_ids));

	if (info->req_ids)
		return info->req_ids & (1U << id);
	per_dev = data->sets[id].per_dev;
	if (!per_dev && !data->sets[id].strings)
		return false;

	return data->base.dev ? per_dev : !per_dev;
}

static int strset_get_id(const struct nlattr *nest, u32 *val,
			 struct netlink_ext_ack *extack)
{
	struct nlattr *tb[ARRAY_SIZE(get_stringset_policy)];
	int ret;

	ret = nla_parse_nested(tb, ARRAY_SIZE(get_stringset_policy) - 1, nest,
			       get_stringset_policy, extack);
	if (ret < 0)
		return ret;
	if (NL_REQ_ATTR_CHECK(extack, nest, tb, ETHTOOL_A_STRINGSET_ID))
		return -EINVAL;

	*val = nla_get_u32(tb[ETHTOOL_A_STRINGSET_ID]);
	return 0;
}

static const struct nla_policy strset_stringsets_policy[] = {
	[ETHTOOL_A_STRINGSETS_STRINGSET]	= { .type = NLA_NESTED },
};

static int strset_parse_request(struct ethnl_req_info *req_base,
				struct nlattr **tb,
				struct netlink_ext_ack *extack)
{
	struct strset_req_info *req_info = STRSET_REQINFO(req_base);
	struct nlattr *nest = tb[ETHTOOL_A_STRSET_STRINGSETS];
	struct nlattr *attr;
	int rem, ret;

	if (!nest)
		return 0;
	ret = nla_validate_nested(nest,
				  ARRAY_SIZE(strset_stringsets_policy) - 1,
				  strset_stringsets_policy, extack);
	if (ret < 0)
		return ret;

	req_info->counts_only = tb[ETHTOOL_A_STRSET_COUNTS_ONLY];
	nla_for_each_nested(attr, nest, rem) {
		u32 id;

		if (WARN_ONCE(nla_type(attr) != ETHTOOL_A_STRINGSETS_STRINGSET,
			      "unexpected attrtype %u in ETHTOOL_A_STRSET_STRINGSETS\n",
			      nla_type(attr)))
			return -EINVAL;

		ret = strset_get_id(attr, &id, extack);
		if (ret < 0)
			return ret;
		if (id >= ETH_SS_COUNT) {
			NL_SET_ERR_MSG_ATTR(extack, attr,
					    "unknown string set id");
			return -EOPNOTSUPP;
		}

		req_info->req_ids |= (1U << id);
	}

	return 0;
}

static void strset_cleanup_data(struct ethnl_reply_data *reply_base)
{
	struct strset_reply_data *data = STRSET_REPDATA(reply_base);
	unsigned int i;

	for (i = 0; i < ETH_SS_COUNT; i++)
		if (data->sets[i].free_strings) {
			kfree(data->sets[i].strings);
			data->sets[i].strings = NULL;
			data->sets[i].free_strings = false;
		}
}

static int strset_prepare_set(struct strset_info *info, struct net_device *dev,
			      unsigned int id, bool counts_only)
{
	const struct ethtool_phy_ops *phy_ops = ethtool_phy_ops;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	void *strings;
	int count, ret;

	if (id == ETH_SS_PHY_STATS && dev->phydev &&
	    !ops->get_ethtool_phy_stats && phy_ops &&
	    phy_ops->get_sset_count)
		ret = phy_ops->get_sset_count(dev->phydev);
	else if (ops->get_sset_count && ops->get_strings)
		ret = ops->get_sset_count(dev, id);
	else
		ret = -EOPNOTSUPP;
	if (ret <= 0) {
		info->count = 0;
		return 0;
	}

	count = ret;
	if (!counts_only) {
		strings = kcalloc(count, ETH_GSTRING_LEN, GFP_KERNEL);
		if (!strings)
			return -ENOMEM;
		if (id == ETH_SS_PHY_STATS && dev->phydev &&
		    !ops->get_ethtool_phy_stats && phy_ops &&
		    phy_ops->get_strings)
			phy_ops->get_strings(dev->phydev, strings);
		else
			ops->get_strings(dev, id, strings);
		info->strings = strings;
		info->free_strings = true;
	}
	info->count = count;

	return 0;
}

static int strset_prepare_data(const struct ethnl_req_info *req_base,
			       struct ethnl_reply_data *reply_base,
			       const struct genl_info *info)
{
	const struct strset_req_info *req_info = STRSET_REQINFO(req_base);
	struct strset_reply_data *data = STRSET_REPDATA(reply_base);
	struct net_device *dev = reply_base->dev;
	unsigned int i;
	int ret;

	BUILD_BUG_ON(ARRAY_SIZE(info_template) != ETH_SS_COUNT);
	memcpy(&data->sets, &info_template, sizeof(data->sets));

	if (!dev) {
		for (i = 0; i < ETH_SS_COUNT; i++) {
			if ((req_info->req_ids & (1U << i)) &&
			    data->sets[i].per_dev) {
				if (info)
					GENL_SET_ERR_MSG(info, "requested per device strings without dev");
				return -EINVAL;
			}
		}
		return 0;
	}

	ret = ethnl_ops_begin(dev);
	if (ret < 0)
		goto err_strset;
	for (i = 0; i < ETH_SS_COUNT; i++) {
		if (!strset_include(req_info, data, i) ||
		    !data->sets[i].per_dev)
			continue;

		ret = strset_prepare_set(&data->sets[i], dev, i,
					 req_info->counts_only);
		if (ret < 0)
			goto err_ops;
	}
	ethnl_ops_complete(dev);

	return 0;
err_ops:
	ethnl_ops_complete(dev);
err_strset:
	strset_cleanup_data(reply_base);
	return ret;
}

/* calculate size of ETHTOOL_A_STRSET_STRINGSET nest for one string set */
static int strset_set_size(const struct strset_info *info, bool counts_only)
{
	unsigned int len = 0;
	unsigned int i;

	if (info->count == 0)
		return 0;
	if (counts_only)
		return nla_total_size(2 * nla_total_size(sizeof(u32)));

	for (i = 0; i < info->count; i++) {
		const char *str = info->strings[i];

		/* ETHTOOL_A_STRING_INDEX, ETHTOOL_A_STRING_VALUE, nest */
		len += nla_total_size(nla_total_size(sizeof(u32)) +
				      ethnl_strz_size(str));
	}
	/* ETHTOOL_A_STRINGSET_ID, ETHTOOL_A_STRINGSET_COUNT */
	len = 2 * nla_total_size(sizeof(u32)) + nla_total_size(len);

	return nla_total_size(len);
}

static int strset_reply_size(const struct ethnl_req_info *req_base,
			     const struct ethnl_reply_data *reply_base)
{
	const struct strset_req_info *req_info = STRSET_REQINFO(req_base);
	const struct strset_reply_data *data = STRSET_REPDATA(reply_base);
	unsigned int i;
	int len = 0;
	int ret;

	len += nla_total_size(0); /* ETHTOOL_A_STRSET_STRINGSETS */

	for (i = 0; i < ETH_SS_COUNT; i++) {
		const struct strset_info *set_info = &data->sets[i];

		if (!strset_include(req_info, data, i))
			continue;

		ret = strset_set_size(set_info, req_info->counts_only);
		if (ret < 0)
			return ret;
		len += ret;
	}

	return len;
}

/* fill one string into reply */
static int strset_fill_string(struct sk_buff *skb,
			      const struct strset_info *set_info, u32 idx)
{
	struct nlattr *string_attr;
	const char *value;

	value = set_info->strings[idx];

	string_attr = nla_nest_start(skb, ETHTOOL_A_STRINGS_STRING);
	if (!string_attr)
		return -EMSGSIZE;
	if (nla_put_u32(skb, ETHTOOL_A_STRING_INDEX, idx) ||
	    ethnl_put_strz(skb, ETHTOOL_A_STRING_VALUE, value))
		goto nla_put_failure;
	nla_nest_end(skb, string_attr);

	return 0;
nla_put_failure:
	nla_nest_cancel(skb, string_attr);
	return -EMSGSIZE;
}

/* fill one string set into reply */
static int strset_fill_set(struct sk_buff *skb,
			   const struct strset_info *set_info, u32 id,
			   bool counts_only)
{
	struct nlattr *stringset_attr;
	struct nlattr *strings_attr;
	unsigned int i;

	if (!set_info->per_dev && !set_info->strings)
		return -EOPNOTSUPP;
	if (set_info->count == 0)
		return 0;
	stringset_attr = nla_nest_start(skb, ETHTOOL_A_STRINGSETS_STRINGSET);
	if (!stringset_attr)
		return -EMSGSIZE;

	if (nla_put_u32(skb, ETHTOOL_A_STRINGSET_ID, id) ||
	    nla_put_u32(skb, ETHTOOL_A_STRINGSET_COUNT, set_info->count))
		goto nla_put_failure;

	if (!counts_only) {
		strings_attr = nla_nest_start(skb, ETHTOOL_A_STRINGSET_STRINGS);
		if (!strings_attr)
			goto nla_put_failure;
		for (i = 0; i < set_info->count; i++) {
			if (strset_fill_string(skb, set_info, i) < 0)
				goto nla_put_failure;
		}
		nla_nest_end(skb, strings_attr);
	}

	nla_nest_end(skb, stringset_attr);
	return 0;

nla_put_failure:
	nla_nest_cancel(skb, stringset_attr);
	return -EMSGSIZE;
}

static int strset_fill_reply(struct sk_buff *skb,
			     const struct ethnl_req_info *req_base,
			     const struct ethnl_reply_data *reply_base)
{
	const struct strset_req_info *req_info = STRSET_REQINFO(req_base);
	const struct strset_reply_data *data = STRSET_REPDATA(reply_base);
	struct nlattr *nest;
	unsigned int i;
	int ret;

	nest = nla_nest_start(skb, ETHTOOL_A_STRSET_STRINGSETS);
	if (!nest)
		return -EMSGSIZE;

	for (i = 0; i < ETH_SS_COUNT; i++) {
		if (strset_include(req_info, data, i)) {
			ret = strset_fill_set(skb, &data->sets[i], i,
					      req_info->counts_only);
			if (ret < 0)
				goto nla_put_failure;
		}
	}

	nla_nest_end(skb, nest);
	return 0;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	return ret;
}

const struct ethnl_request_ops ethnl_strset_request_ops = {
	.request_cmd		= ETHTOOL_MSG_STRSET_GET,
	.reply_cmd		= ETHTOOL_MSG_STRSET_GET_REPLY,
	.hdr_attr		= ETHTOOL_A_STRSET_HEADER,
	.req_info_size		= sizeof(struct strset_req_info),
	.reply_data_size	= sizeof(struct strset_reply_data),
	.allow_nodev_do		= true,

	.parse_request		= strset_parse_request,
	.prepare_data		= strset_prepare_data,
	.reply_size		= strset_reply_size,
	.fill_reply		= strset_fill_reply,
	.cleanup_data		= strset_cleanup_data,
};