summaryrefslogtreecommitdiff
path: root/net/ethtool/features.c
blob: 1c9f4df273bd55287aa08e5da82c32f1bc96a1ed (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
// SPDX-License-Identifier: GPL-2.0-only

#include "netlink.h"
#include "common.h"
#include "bitset.h"

struct features_req_info {
	struct ethnl_req_info	base;
};

struct features_reply_data {
	struct ethnl_reply_data	base;
	u32			hw[ETHTOOL_DEV_FEATURE_WORDS];
	u32			wanted[ETHTOOL_DEV_FEATURE_WORDS];
	u32			active[ETHTOOL_DEV_FEATURE_WORDS];
	u32			nochange[ETHTOOL_DEV_FEATURE_WORDS];
	u32			all[ETHTOOL_DEV_FEATURE_WORDS];
};

#define FEATURES_REPDATA(__reply_base) \
	container_of(__reply_base, struct features_reply_data, base)

const struct nla_policy ethnl_features_get_policy[] = {
	[ETHTOOL_A_FEATURES_HEADER]	=
		NLA_POLICY_NESTED(ethnl_header_policy),
};

static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
{
	unsigned int i;

	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
		dest[i] = src >> (32 * i);
}

static int features_prepare_data(const struct ethnl_req_info *req_base,
				 struct ethnl_reply_data *reply_base,
				 struct genl_info *info)
{
	struct features_reply_data *data = FEATURES_REPDATA(reply_base);
	struct net_device *dev = reply_base->dev;
	netdev_features_t all_features;

	ethnl_features_to_bitmap32(data->hw, dev->hw_features);
	ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
	ethnl_features_to_bitmap32(data->active, dev->features);
	ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
	all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
	ethnl_features_to_bitmap32(data->all, all_features);

	return 0;
}

static int features_reply_size(const struct ethnl_req_info *req_base,
			       const struct ethnl_reply_data *reply_base)
{
	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	unsigned int len = 0;
	int ret;

	ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
				  netdev_features_strings, compact);
	if (ret < 0)
		return ret;
	len += ret;
	ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
				  netdev_features_strings, compact);
	if (ret < 0)
		return ret;
	len += ret;
	ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
				  netdev_features_strings, compact);
	if (ret < 0)
		return ret;
	len += ret;
	ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
				  netdev_features_strings, compact);
	if (ret < 0)
		return ret;
	len += ret;

	return len;
}

static int features_fill_reply(struct sk_buff *skb,
			       const struct ethnl_req_info *req_base,
			       const struct ethnl_reply_data *reply_base)
{
	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	int ret;

	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
				 data->all, NETDEV_FEATURE_COUNT,
				 netdev_features_strings, compact);
	if (ret < 0)
		return ret;
	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
				 NULL, NETDEV_FEATURE_COUNT,
				 netdev_features_strings, compact);
	if (ret < 0)
		return ret;
	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
				 NULL, NETDEV_FEATURE_COUNT,
				 netdev_features_strings, compact);
	if (ret < 0)
		return ret;
	return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
				  data->nochange, NULL, NETDEV_FEATURE_COUNT,
				  netdev_features_strings, compact);
}

const struct ethnl_request_ops ethnl_features_request_ops = {
	.request_cmd		= ETHTOOL_MSG_FEATURES_GET,
	.reply_cmd		= ETHTOOL_MSG_FEATURES_GET_REPLY,
	.hdr_attr		= ETHTOOL_A_FEATURES_HEADER,
	.req_info_size		= sizeof(struct features_req_info),
	.reply_data_size	= sizeof(struct features_reply_data),

	.prepare_data		= features_prepare_data,
	.reply_size		= features_reply_size,
	.fill_reply		= features_fill_reply,
};

/* FEATURES_SET */

const struct nla_policy ethnl_features_set_policy[] = {
	[ETHTOOL_A_FEATURES_HEADER]	=
		NLA_POLICY_NESTED(ethnl_header_policy),
	[ETHTOOL_A_FEATURES_WANTED]	= { .type = NLA_NESTED },
};

static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
{
	const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
	unsigned int i;

	bitmap_zero(dest, NETDEV_FEATURE_COUNT);
	for (i = 0; i < words; i++)
		dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG));
}

static netdev_features_t ethnl_bitmap_to_features(unsigned long *src)
{
	const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE;
	const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
	netdev_features_t ret = 0;
	unsigned int i;

	for (i = 0; i < words; i++)
		ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG);
	ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT);
	return ret;
}

static int features_send_reply(struct net_device *dev, struct genl_info *info,
			       const unsigned long *wanted,
			       const unsigned long *wanted_mask,
			       const unsigned long *active,
			       const unsigned long *active_mask, bool compact)
{
	struct sk_buff *rskb;
	void *reply_payload;
	int reply_len = 0;
	int ret;

	reply_len = ethnl_reply_header_size();
	ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT,
				netdev_features_strings, compact);
	if (ret < 0)
		goto err;
	reply_len += ret;
	ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT,
				netdev_features_strings, compact);
	if (ret < 0)
		goto err;
	reply_len += ret;

	ret = -ENOMEM;
	rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY,
				ETHTOOL_A_FEATURES_HEADER, info,
				&reply_payload);
	if (!rskb)
		goto err;

	ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted,
			       wanted_mask, NETDEV_FEATURE_COUNT,
			       netdev_features_strings, compact);
	if (ret < 0)
		goto nla_put_failure;
	ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active,
			       active_mask, NETDEV_FEATURE_COUNT,
			       netdev_features_strings, compact);
	if (ret < 0)
		goto nla_put_failure;

	genlmsg_end(rskb, reply_payload);
	ret = genlmsg_reply(rskb, info);
	return ret;

nla_put_failure:
	nlmsg_free(rskb);
	WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n",
		  reply_len);
err:
	GENL_SET_ERR_MSG(info, "failed to send reply message");
	return ret;
}

int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
{
	DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
	struct ethnl_req_info req_info = {};
	struct nlattr **tb = info->attrs;
	struct net_device *dev;
	bool mod;
	int ret;

	if (!tb[ETHTOOL_A_FEATURES_WANTED])
		return -EINVAL;
	ret = ethnl_parse_header_dev_get(&req_info,
					 tb[ETHTOOL_A_FEATURES_HEADER],
					 genl_info_net(info), info->extack,
					 true);
	if (ret < 0)
		return ret;
	dev = req_info.dev;

	rtnl_lock();
	ethnl_features_to_bitmap(old_active, dev->features);
	ethnl_features_to_bitmap(old_wanted, dev->wanted_features);
	ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
				 tb[ETHTOOL_A_FEATURES_WANTED],
				 netdev_features_strings, info->extack);
	if (ret < 0)
		goto out_rtnl;
	if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
		GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
		ret = -EINVAL;
		goto out_rtnl;
	}

	/* set req_wanted bits not in req_mask from old_wanted */
	bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
	bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT);
	bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT);
	if (!bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) {
		dev->wanted_features &= ~dev->hw_features;
		dev->wanted_features |= ethnl_bitmap_to_features(req_wanted) & dev->hw_features;
		__netdev_update_features(dev);
	}
	ethnl_features_to_bitmap(new_active, dev->features);
	mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);

	ret = 0;
	if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
		bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS;

		bitmap_xor(wanted_diff_mask, req_wanted, new_active,
			   NETDEV_FEATURE_COUNT);
		bitmap_xor(active_diff_mask, old_active, new_active,
			   NETDEV_FEATURE_COUNT);
		bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask,
			   NETDEV_FEATURE_COUNT);
		bitmap_and(req_wanted, req_wanted, wanted_diff_mask,
			   NETDEV_FEATURE_COUNT);
		bitmap_and(new_active, new_active, active_diff_mask,
			   NETDEV_FEATURE_COUNT);

		ret = features_send_reply(dev, info, req_wanted,
					  wanted_diff_mask, new_active,
					  active_diff_mask, compact);
	}
	if (mod)
		netdev_features_change(dev);

out_rtnl:
	rtnl_unlock();
	dev_put(dev);
	return ret;
}