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0524399d MK |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | ||
3 | #include "netlink.h" | |
4 | #include "common.h" | |
5 | #include "bitset.h" | |
6 | ||
7 | struct features_req_info { | |
8 | struct ethnl_req_info base; | |
9 | }; | |
10 | ||
11 | struct features_reply_data { | |
12 | struct ethnl_reply_data base; | |
13 | u32 hw[ETHTOOL_DEV_FEATURE_WORDS]; | |
14 | u32 wanted[ETHTOOL_DEV_FEATURE_WORDS]; | |
15 | u32 active[ETHTOOL_DEV_FEATURE_WORDS]; | |
16 | u32 nochange[ETHTOOL_DEV_FEATURE_WORDS]; | |
17 | u32 all[ETHTOOL_DEV_FEATURE_WORDS]; | |
18 | }; | |
19 | ||
20 | #define FEATURES_REPDATA(__reply_base) \ | |
21 | container_of(__reply_base, struct features_reply_data, base) | |
22 | ||
ff419afa | 23 | const struct nla_policy ethnl_features_get_policy[] = { |
329d9c33 JK |
24 | [ETHTOOL_A_FEATURES_HEADER] = |
25 | NLA_POLICY_NESTED(ethnl_header_policy), | |
0524399d MK |
26 | }; |
27 | ||
28 | static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src) | |
29 | { | |
30 | unsigned int i; | |
31 | ||
32 | for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++) | |
33 | dest[i] = src >> (32 * i); | |
34 | } | |
35 | ||
36 | static int features_prepare_data(const struct ethnl_req_info *req_base, | |
37 | struct ethnl_reply_data *reply_base, | |
38 | struct genl_info *info) | |
39 | { | |
40 | struct features_reply_data *data = FEATURES_REPDATA(reply_base); | |
41 | struct net_device *dev = reply_base->dev; | |
42 | netdev_features_t all_features; | |
43 | ||
44 | ethnl_features_to_bitmap32(data->hw, dev->hw_features); | |
45 | ethnl_features_to_bitmap32(data->wanted, dev->wanted_features); | |
46 | ethnl_features_to_bitmap32(data->active, dev->features); | |
47 | ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE); | |
48 | all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0); | |
49 | ethnl_features_to_bitmap32(data->all, all_features); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static int features_reply_size(const struct ethnl_req_info *req_base, | |
55 | const struct ethnl_reply_data *reply_base) | |
56 | { | |
57 | const struct features_reply_data *data = FEATURES_REPDATA(reply_base); | |
58 | bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; | |
59 | unsigned int len = 0; | |
60 | int ret; | |
61 | ||
62 | ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT, | |
63 | netdev_features_strings, compact); | |
64 | if (ret < 0) | |
65 | return ret; | |
66 | len += ret; | |
67 | ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT, | |
68 | netdev_features_strings, compact); | |
69 | if (ret < 0) | |
70 | return ret; | |
71 | len += ret; | |
72 | ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT, | |
73 | netdev_features_strings, compact); | |
74 | if (ret < 0) | |
75 | return ret; | |
76 | len += ret; | |
77 | ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT, | |
78 | netdev_features_strings, compact); | |
79 | if (ret < 0) | |
80 | return ret; | |
81 | len += ret; | |
82 | ||
83 | return len; | |
84 | } | |
85 | ||
86 | static int features_fill_reply(struct sk_buff *skb, | |
87 | const struct ethnl_req_info *req_base, | |
88 | const struct ethnl_reply_data *reply_base) | |
89 | { | |
90 | const struct features_reply_data *data = FEATURES_REPDATA(reply_base); | |
91 | bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; | |
92 | int ret; | |
93 | ||
94 | ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw, | |
95 | data->all, NETDEV_FEATURE_COUNT, | |
96 | netdev_features_strings, compact); | |
97 | if (ret < 0) | |
98 | return ret; | |
99 | ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted, | |
100 | NULL, NETDEV_FEATURE_COUNT, | |
101 | netdev_features_strings, compact); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active, | |
105 | NULL, NETDEV_FEATURE_COUNT, | |
106 | netdev_features_strings, compact); | |
107 | if (ret < 0) | |
108 | return ret; | |
109 | return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE, | |
110 | data->nochange, NULL, NETDEV_FEATURE_COUNT, | |
111 | netdev_features_strings, compact); | |
112 | } | |
113 | ||
114 | const struct ethnl_request_ops ethnl_features_request_ops = { | |
115 | .request_cmd = ETHTOOL_MSG_FEATURES_GET, | |
116 | .reply_cmd = ETHTOOL_MSG_FEATURES_GET_REPLY, | |
117 | .hdr_attr = ETHTOOL_A_FEATURES_HEADER, | |
0524399d MK |
118 | .req_info_size = sizeof(struct features_req_info), |
119 | .reply_data_size = sizeof(struct features_reply_data), | |
0524399d MK |
120 | |
121 | .prepare_data = features_prepare_data, | |
122 | .reply_size = features_reply_size, | |
123 | .fill_reply = features_fill_reply, | |
124 | }; | |
0980bfcd MK |
125 | |
126 | /* FEATURES_SET */ | |
127 | ||
ff419afa | 128 | const struct nla_policy ethnl_features_set_policy[] = { |
329d9c33 JK |
129 | [ETHTOOL_A_FEATURES_HEADER] = |
130 | NLA_POLICY_NESTED(ethnl_header_policy), | |
0980bfcd | 131 | [ETHTOOL_A_FEATURES_WANTED] = { .type = NLA_NESTED }, |
0980bfcd MK |
132 | }; |
133 | ||
134 | static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val) | |
135 | { | |
136 | const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT); | |
137 | unsigned int i; | |
138 | ||
139 | bitmap_zero(dest, NETDEV_FEATURE_COUNT); | |
140 | for (i = 0; i < words; i++) | |
141 | dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG)); | |
142 | } | |
143 | ||
144 | static netdev_features_t ethnl_bitmap_to_features(unsigned long *src) | |
145 | { | |
146 | const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE; | |
147 | const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT); | |
148 | netdev_features_t ret = 0; | |
149 | unsigned int i; | |
150 | ||
151 | for (i = 0; i < words; i++) | |
152 | ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG); | |
153 | ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT); | |
154 | return ret; | |
155 | } | |
156 | ||
157 | static int features_send_reply(struct net_device *dev, struct genl_info *info, | |
158 | const unsigned long *wanted, | |
159 | const unsigned long *wanted_mask, | |
160 | const unsigned long *active, | |
161 | const unsigned long *active_mask, bool compact) | |
162 | { | |
163 | struct sk_buff *rskb; | |
164 | void *reply_payload; | |
165 | int reply_len = 0; | |
166 | int ret; | |
167 | ||
168 | reply_len = ethnl_reply_header_size(); | |
169 | ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT, | |
170 | netdev_features_strings, compact); | |
171 | if (ret < 0) | |
172 | goto err; | |
173 | reply_len += ret; | |
174 | ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT, | |
175 | netdev_features_strings, compact); | |
176 | if (ret < 0) | |
177 | goto err; | |
178 | reply_len += ret; | |
179 | ||
180 | ret = -ENOMEM; | |
181 | rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY, | |
182 | ETHTOOL_A_FEATURES_HEADER, info, | |
183 | &reply_payload); | |
184 | if (!rskb) | |
185 | goto err; | |
186 | ||
187 | ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted, | |
188 | wanted_mask, NETDEV_FEATURE_COUNT, | |
189 | netdev_features_strings, compact); | |
190 | if (ret < 0) | |
191 | goto nla_put_failure; | |
192 | ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active, | |
193 | active_mask, NETDEV_FEATURE_COUNT, | |
194 | netdev_features_strings, compact); | |
195 | if (ret < 0) | |
196 | goto nla_put_failure; | |
197 | ||
198 | genlmsg_end(rskb, reply_payload); | |
199 | ret = genlmsg_reply(rskb, info); | |
200 | return ret; | |
201 | ||
202 | nla_put_failure: | |
203 | nlmsg_free(rskb); | |
204 | WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n", | |
205 | reply_len); | |
206 | err: | |
207 | GENL_SET_ERR_MSG(info, "failed to send reply message"); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | int ethnl_set_features(struct sk_buff *skb, struct genl_info *info) | |
212 | { | |
213 | DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT); | |
214 | DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT); | |
215 | DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT); | |
840110a4 | 216 | DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT); |
0980bfcd | 217 | DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT); |
840110a4 | 218 | DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT); |
0980bfcd MK |
219 | DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT); |
220 | DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT); | |
0980bfcd | 221 | struct ethnl_req_info req_info = {}; |
5028588b | 222 | struct nlattr **tb = info->attrs; |
0980bfcd | 223 | struct net_device *dev; |
9c6451ef | 224 | bool mod; |
0980bfcd MK |
225 | int ret; |
226 | ||
0980bfcd MK |
227 | if (!tb[ETHTOOL_A_FEATURES_WANTED]) |
228 | return -EINVAL; | |
229 | ret = ethnl_parse_header_dev_get(&req_info, | |
230 | tb[ETHTOOL_A_FEATURES_HEADER], | |
231 | genl_info_net(info), info->extack, | |
232 | true); | |
233 | if (ret < 0) | |
234 | return ret; | |
235 | dev = req_info.dev; | |
236 | ||
237 | rtnl_lock(); | |
238 | ethnl_features_to_bitmap(old_active, dev->features); | |
840110a4 | 239 | ethnl_features_to_bitmap(old_wanted, dev->wanted_features); |
0980bfcd MK |
240 | ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT, |
241 | tb[ETHTOOL_A_FEATURES_WANTED], | |
242 | netdev_features_strings, info->extack); | |
243 | if (ret < 0) | |
244 | goto out_rtnl; | |
245 | if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) { | |
246 | GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features"); | |
247 | ret = -EINVAL; | |
248 | goto out_rtnl; | |
249 | } | |
250 | ||
840110a4 | 251 | /* set req_wanted bits not in req_mask from old_wanted */ |
0980bfcd | 252 | bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT); |
840110a4 MM |
253 | bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT); |
254 | bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT); | |
f01204ec MM |
255 | if (!bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) { |
256 | dev->wanted_features &= ~dev->hw_features; | |
257 | dev->wanted_features |= ethnl_bitmap_to_features(req_wanted) & dev->hw_features; | |
258 | __netdev_update_features(dev); | |
0980bfcd | 259 | } |
0980bfcd | 260 | ethnl_features_to_bitmap(new_active, dev->features); |
9c6451ef | 261 | mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT); |
0980bfcd MK |
262 | |
263 | ret = 0; | |
264 | if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) { | |
265 | bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS; | |
266 | ||
267 | bitmap_xor(wanted_diff_mask, req_wanted, new_active, | |
268 | NETDEV_FEATURE_COUNT); | |
269 | bitmap_xor(active_diff_mask, old_active, new_active, | |
270 | NETDEV_FEATURE_COUNT); | |
271 | bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask, | |
272 | NETDEV_FEATURE_COUNT); | |
273 | bitmap_and(req_wanted, req_wanted, wanted_diff_mask, | |
274 | NETDEV_FEATURE_COUNT); | |
275 | bitmap_and(new_active, new_active, active_diff_mask, | |
276 | NETDEV_FEATURE_COUNT); | |
277 | ||
278 | ret = features_send_reply(dev, info, req_wanted, | |
279 | wanted_diff_mask, new_active, | |
280 | active_diff_mask, compact); | |
281 | } | |
9c6451ef | 282 | if (mod) |
41369138 | 283 | netdev_features_change(dev); |
0980bfcd MK |
284 | |
285 | out_rtnl: | |
286 | rtnl_unlock(); | |
287 | dev_put(dev); | |
288 | return ret; | |
289 | } |