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1 | /* |
2 | * Copyright (c) 2017 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/if.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/ip.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/openvswitch.h> | |
16 | #include <linux/netlink.h> | |
17 | #include <linux/rculist.h> | |
18 | ||
19 | #include <net/netlink.h> | |
20 | #include <net/genetlink.h> | |
21 | ||
22 | #include "datapath.h" | |
23 | #include "meter.h" | |
24 | ||
25 | #define METER_HASH_BUCKETS 1024 | |
26 | ||
27 | static const struct nla_policy meter_policy[OVS_METER_ATTR_MAX + 1] = { | |
28 | [OVS_METER_ATTR_ID] = { .type = NLA_U32, }, | |
29 | [OVS_METER_ATTR_KBPS] = { .type = NLA_FLAG }, | |
30 | [OVS_METER_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) }, | |
31 | [OVS_METER_ATTR_BANDS] = { .type = NLA_NESTED }, | |
32 | [OVS_METER_ATTR_USED] = { .type = NLA_U64 }, | |
33 | [OVS_METER_ATTR_CLEAR] = { .type = NLA_FLAG }, | |
34 | [OVS_METER_ATTR_MAX_METERS] = { .type = NLA_U32 }, | |
35 | [OVS_METER_ATTR_MAX_BANDS] = { .type = NLA_U32 }, | |
36 | }; | |
37 | ||
38 | static const struct nla_policy band_policy[OVS_BAND_ATTR_MAX + 1] = { | |
39 | [OVS_BAND_ATTR_TYPE] = { .type = NLA_U32, }, | |
40 | [OVS_BAND_ATTR_RATE] = { .type = NLA_U32, }, | |
41 | [OVS_BAND_ATTR_BURST] = { .type = NLA_U32, }, | |
42 | [OVS_BAND_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) }, | |
43 | }; | |
44 | ||
45 | static void rcu_free_ovs_meter_callback(struct rcu_head *rcu) | |
46 | { | |
47 | struct dp_meter *meter = container_of(rcu, struct dp_meter, rcu); | |
48 | ||
49 | kfree(meter); | |
50 | } | |
51 | ||
52 | static void ovs_meter_free(struct dp_meter *meter) | |
53 | { | |
54 | if (!meter) | |
55 | return; | |
56 | ||
57 | call_rcu(&meter->rcu, rcu_free_ovs_meter_callback); | |
58 | } | |
59 | ||
60 | static struct hlist_head *meter_hash_bucket(const struct datapath *dp, | |
61 | u32 meter_id) | |
62 | { | |
63 | return &dp->meters[meter_id & (METER_HASH_BUCKETS - 1)]; | |
64 | } | |
65 | ||
66 | /* Call with ovs_mutex or RCU read lock. */ | |
67 | static struct dp_meter *lookup_meter(const struct datapath *dp, | |
68 | u32 meter_id) | |
69 | { | |
70 | struct dp_meter *meter; | |
71 | struct hlist_head *head; | |
72 | ||
73 | head = meter_hash_bucket(dp, meter_id); | |
74 | hlist_for_each_entry_rcu(meter, head, dp_hash_node) { | |
75 | if (meter->id == meter_id) | |
76 | return meter; | |
77 | } | |
78 | return NULL; | |
79 | } | |
80 | ||
81 | static void attach_meter(struct datapath *dp, struct dp_meter *meter) | |
82 | { | |
83 | struct hlist_head *head = meter_hash_bucket(dp, meter->id); | |
84 | ||
85 | hlist_add_head_rcu(&meter->dp_hash_node, head); | |
86 | } | |
87 | ||
88 | static void detach_meter(struct dp_meter *meter) | |
89 | { | |
90 | ASSERT_OVSL(); | |
91 | if (meter) | |
92 | hlist_del_rcu(&meter->dp_hash_node); | |
93 | } | |
94 | ||
95 | static struct sk_buff * | |
96 | ovs_meter_cmd_reply_start(struct genl_info *info, u8 cmd, | |
97 | struct ovs_header **ovs_reply_header) | |
98 | { | |
99 | struct sk_buff *skb; | |
100 | struct ovs_header *ovs_header = info->userhdr; | |
101 | ||
102 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
103 | if (!skb) | |
104 | return ERR_PTR(-ENOMEM); | |
105 | ||
106 | *ovs_reply_header = genlmsg_put(skb, info->snd_portid, | |
107 | info->snd_seq, | |
108 | &dp_meter_genl_family, 0, cmd); | |
109 | if (!ovs_reply_header) { | |
110 | nlmsg_free(skb); | |
111 | return ERR_PTR(-EMSGSIZE); | |
112 | } | |
113 | (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex; | |
114 | ||
115 | return skb; | |
116 | } | |
117 | ||
118 | static int ovs_meter_cmd_reply_stats(struct sk_buff *reply, u32 meter_id, | |
119 | struct dp_meter *meter) | |
120 | { | |
121 | struct nlattr *nla; | |
122 | struct dp_meter_band *band; | |
123 | u16 i; | |
124 | ||
125 | if (nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id)) | |
126 | goto error; | |
127 | ||
128 | if (!meter) | |
129 | return 0; | |
130 | ||
131 | if (nla_put(reply, OVS_METER_ATTR_STATS, | |
132 | sizeof(struct ovs_flow_stats), &meter->stats) || | |
133 | nla_put_u64_64bit(reply, OVS_METER_ATTR_USED, meter->used, | |
134 | OVS_METER_ATTR_PAD)) | |
135 | goto error; | |
136 | ||
137 | nla = nla_nest_start(reply, OVS_METER_ATTR_BANDS); | |
138 | if (!nla) | |
139 | goto error; | |
140 | ||
141 | band = meter->bands; | |
142 | ||
143 | for (i = 0; i < meter->n_bands; ++i, ++band) { | |
144 | struct nlattr *band_nla; | |
145 | ||
146 | band_nla = nla_nest_start(reply, OVS_BAND_ATTR_UNSPEC); | |
147 | if (!band_nla || nla_put(reply, OVS_BAND_ATTR_STATS, | |
148 | sizeof(struct ovs_flow_stats), | |
149 | &band->stats)) | |
150 | goto error; | |
151 | nla_nest_end(reply, band_nla); | |
152 | } | |
153 | nla_nest_end(reply, nla); | |
154 | ||
155 | return 0; | |
156 | error: | |
157 | return -EMSGSIZE; | |
158 | } | |
159 | ||
160 | static int ovs_meter_cmd_features(struct sk_buff *skb, struct genl_info *info) | |
161 | { | |
162 | struct sk_buff *reply; | |
163 | struct ovs_header *ovs_reply_header; | |
164 | struct nlattr *nla, *band_nla; | |
165 | int err; | |
166 | ||
167 | reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_FEATURES, | |
168 | &ovs_reply_header); | |
169 | if (!reply) | |
170 | return PTR_ERR(reply); | |
171 | ||
172 | if (nla_put_u32(reply, OVS_METER_ATTR_MAX_METERS, U32_MAX) || | |
173 | nla_put_u32(reply, OVS_METER_ATTR_MAX_BANDS, DP_MAX_BANDS)) | |
174 | goto nla_put_failure; | |
175 | ||
176 | nla = nla_nest_start(reply, OVS_METER_ATTR_BANDS); | |
177 | if (!nla) | |
178 | goto nla_put_failure; | |
179 | ||
180 | band_nla = nla_nest_start(reply, OVS_BAND_ATTR_UNSPEC); | |
181 | if (!band_nla) | |
182 | goto nla_put_failure; | |
183 | /* Currently only DROP band type is supported. */ | |
184 | if (nla_put_u32(reply, OVS_BAND_ATTR_TYPE, OVS_METER_BAND_TYPE_DROP)) | |
185 | goto nla_put_failure; | |
186 | nla_nest_end(reply, band_nla); | |
187 | nla_nest_end(reply, nla); | |
188 | ||
189 | genlmsg_end(reply, ovs_reply_header); | |
190 | return genlmsg_reply(reply, info); | |
191 | ||
192 | nla_put_failure: | |
193 | nlmsg_free(reply); | |
194 | err = -EMSGSIZE; | |
195 | return err; | |
196 | } | |
197 | ||
198 | static struct dp_meter *dp_meter_create(struct nlattr **a) | |
199 | { | |
200 | struct nlattr *nla; | |
201 | int rem; | |
202 | u16 n_bands = 0; | |
203 | struct dp_meter *meter; | |
204 | struct dp_meter_band *band; | |
205 | int err; | |
206 | ||
207 | /* Validate attributes, count the bands. */ | |
208 | if (!a[OVS_METER_ATTR_BANDS]) | |
209 | return ERR_PTR(-EINVAL); | |
210 | ||
211 | nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem) | |
212 | if (++n_bands > DP_MAX_BANDS) | |
213 | return ERR_PTR(-EINVAL); | |
214 | ||
215 | /* Allocate and set up the meter before locking anything. */ | |
216 | meter = kzalloc(n_bands * sizeof(struct dp_meter_band) + | |
217 | sizeof(*meter), GFP_KERNEL); | |
218 | if (!meter) | |
219 | return ERR_PTR(-ENOMEM); | |
220 | ||
221 | meter->used = div_u64(ktime_get_ns(), 1000 * 1000); | |
222 | meter->kbps = a[OVS_METER_ATTR_KBPS] ? 1 : 0; | |
223 | meter->keep_stats = !a[OVS_METER_ATTR_CLEAR]; | |
224 | spin_lock_init(&meter->lock); | |
225 | if (meter->keep_stats && a[OVS_METER_ATTR_STATS]) { | |
226 | meter->stats = *(struct ovs_flow_stats *) | |
227 | nla_data(a[OVS_METER_ATTR_STATS]); | |
228 | } | |
229 | meter->n_bands = n_bands; | |
230 | ||
231 | /* Set up meter bands. */ | |
232 | band = meter->bands; | |
233 | nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem) { | |
234 | struct nlattr *attr[OVS_BAND_ATTR_MAX + 1]; | |
235 | u32 band_max_delta_t; | |
236 | ||
237 | err = nla_parse((struct nlattr **)&attr, OVS_BAND_ATTR_MAX, | |
238 | nla_data(nla), nla_len(nla), band_policy, | |
239 | NULL); | |
240 | if (err) | |
241 | goto exit_free_meter; | |
242 | ||
243 | if (!attr[OVS_BAND_ATTR_TYPE] || | |
244 | !attr[OVS_BAND_ATTR_RATE] || | |
245 | !attr[OVS_BAND_ATTR_BURST]) { | |
246 | err = -EINVAL; | |
247 | goto exit_free_meter; | |
248 | } | |
249 | ||
250 | band->type = nla_get_u32(attr[OVS_BAND_ATTR_TYPE]); | |
251 | band->rate = nla_get_u32(attr[OVS_BAND_ATTR_RATE]); | |
252 | band->burst_size = nla_get_u32(attr[OVS_BAND_ATTR_BURST]); | |
253 | /* Figure out max delta_t that is enough to fill any bucket. | |
254 | * Keep max_delta_t size to the bucket units: | |
255 | * pkts => 1/1000 packets, kilobits => bits. | |
256 | */ | |
257 | band_max_delta_t = (band->burst_size + band->rate) * 1000; | |
258 | /* Start with a full bucket. */ | |
259 | band->bucket = band_max_delta_t; | |
260 | if (band_max_delta_t > meter->max_delta_t) | |
261 | meter->max_delta_t = band_max_delta_t; | |
262 | band++; | |
263 | } | |
264 | ||
265 | return meter; | |
266 | ||
267 | exit_free_meter: | |
268 | kfree(meter); | |
269 | return ERR_PTR(err); | |
270 | } | |
271 | ||
272 | static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
273 | { | |
274 | struct nlattr **a = info->attrs; | |
275 | struct dp_meter *meter, *old_meter; | |
276 | struct sk_buff *reply; | |
277 | struct ovs_header *ovs_reply_header; | |
278 | struct ovs_header *ovs_header = info->userhdr; | |
279 | struct datapath *dp; | |
280 | int err; | |
281 | u32 meter_id; | |
282 | bool failed; | |
283 | ||
284 | meter = dp_meter_create(a); | |
285 | if (IS_ERR_OR_NULL(meter)) | |
286 | return PTR_ERR(meter); | |
287 | ||
288 | reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET, | |
289 | &ovs_reply_header); | |
290 | if (IS_ERR(reply)) { | |
291 | err = PTR_ERR(reply); | |
292 | goto exit_free_meter; | |
293 | } | |
294 | ||
295 | ovs_lock(); | |
296 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
297 | if (!dp) { | |
298 | err = -ENODEV; | |
299 | goto exit_unlock; | |
300 | } | |
301 | ||
302 | if (!a[OVS_METER_ATTR_ID]) { | |
303 | err = -ENODEV; | |
304 | goto exit_unlock; | |
305 | } | |
306 | ||
307 | meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]); | |
308 | ||
309 | /* Cannot fail after this. */ | |
310 | old_meter = lookup_meter(dp, meter_id); | |
311 | detach_meter(old_meter); | |
312 | attach_meter(dp, meter); | |
313 | ovs_unlock(); | |
314 | ||
315 | /* Build response with the meter_id and stats from | |
316 | * the old meter, if any. | |
317 | */ | |
318 | failed = nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id); | |
319 | WARN_ON(failed); | |
320 | if (old_meter) { | |
321 | spin_lock_bh(&old_meter->lock); | |
322 | if (old_meter->keep_stats) { | |
323 | err = ovs_meter_cmd_reply_stats(reply, meter_id, | |
324 | old_meter); | |
325 | WARN_ON(err); | |
326 | } | |
327 | spin_unlock_bh(&old_meter->lock); | |
328 | ovs_meter_free(old_meter); | |
329 | } | |
330 | ||
331 | genlmsg_end(reply, ovs_reply_header); | |
332 | return genlmsg_reply(reply, info); | |
333 | ||
334 | exit_unlock: | |
335 | ovs_unlock(); | |
336 | nlmsg_free(reply); | |
337 | exit_free_meter: | |
338 | kfree(meter); | |
339 | return err; | |
340 | } | |
341 | ||
342 | static int ovs_meter_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
343 | { | |
344 | struct nlattr **a = info->attrs; | |
345 | u32 meter_id; | |
346 | struct ovs_header *ovs_header = info->userhdr; | |
347 | struct ovs_header *ovs_reply_header; | |
348 | struct datapath *dp; | |
349 | int err; | |
350 | struct sk_buff *reply; | |
351 | struct dp_meter *meter; | |
352 | ||
353 | if (!a[OVS_METER_ATTR_ID]) | |
354 | return -EINVAL; | |
355 | ||
356 | meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]); | |
357 | ||
358 | reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_GET, | |
359 | &ovs_reply_header); | |
360 | if (IS_ERR(reply)) | |
361 | return PTR_ERR(reply); | |
362 | ||
363 | ovs_lock(); | |
364 | ||
365 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
366 | if (!dp) { | |
367 | err = -ENODEV; | |
368 | goto exit_unlock; | |
369 | } | |
370 | ||
371 | /* Locate meter, copy stats. */ | |
372 | meter = lookup_meter(dp, meter_id); | |
373 | if (!meter) { | |
374 | err = -ENOENT; | |
375 | goto exit_unlock; | |
376 | } | |
377 | ||
378 | spin_lock_bh(&meter->lock); | |
379 | err = ovs_meter_cmd_reply_stats(reply, meter_id, meter); | |
380 | spin_unlock_bh(&meter->lock); | |
381 | if (err) | |
382 | goto exit_unlock; | |
383 | ||
384 | ovs_unlock(); | |
385 | ||
386 | genlmsg_end(reply, ovs_reply_header); | |
387 | return genlmsg_reply(reply, info); | |
388 | ||
389 | exit_unlock: | |
390 | ovs_unlock(); | |
391 | nlmsg_free(reply); | |
392 | return err; | |
393 | } | |
394 | ||
395 | static int ovs_meter_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
396 | { | |
397 | struct nlattr **a = info->attrs; | |
398 | u32 meter_id; | |
399 | struct ovs_header *ovs_header = info->userhdr; | |
400 | struct ovs_header *ovs_reply_header; | |
401 | struct datapath *dp; | |
402 | int err; | |
403 | struct sk_buff *reply; | |
404 | struct dp_meter *old_meter; | |
405 | ||
406 | if (!a[OVS_METER_ATTR_ID]) | |
407 | return -EINVAL; | |
408 | meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]); | |
409 | ||
410 | reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_DEL, | |
411 | &ovs_reply_header); | |
412 | if (IS_ERR(reply)) | |
413 | return PTR_ERR(reply); | |
414 | ||
415 | ovs_lock(); | |
416 | ||
417 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
418 | if (!dp) { | |
419 | err = -ENODEV; | |
420 | goto exit_unlock; | |
421 | } | |
422 | ||
423 | old_meter = lookup_meter(dp, meter_id); | |
424 | if (old_meter) { | |
425 | spin_lock_bh(&old_meter->lock); | |
426 | err = ovs_meter_cmd_reply_stats(reply, meter_id, old_meter); | |
427 | WARN_ON(err); | |
428 | spin_unlock_bh(&old_meter->lock); | |
429 | detach_meter(old_meter); | |
430 | } | |
431 | ovs_unlock(); | |
432 | ovs_meter_free(old_meter); | |
433 | genlmsg_end(reply, ovs_reply_header); | |
434 | return genlmsg_reply(reply, info); | |
435 | ||
436 | exit_unlock: | |
437 | ovs_unlock(); | |
438 | nlmsg_free(reply); | |
439 | return err; | |
440 | } | |
441 | ||
442 | /* Meter action execution. | |
443 | * | |
444 | * Return true 'meter_id' drop band is triggered. The 'skb' should be | |
445 | * dropped by the caller'. | |
446 | */ | |
447 | bool ovs_meter_execute(struct datapath *dp, struct sk_buff *skb, | |
448 | struct sw_flow_key *key, u32 meter_id) | |
449 | { | |
450 | struct dp_meter *meter; | |
451 | struct dp_meter_band *band; | |
452 | long long int now_ms = div_u64(ktime_get_ns(), 1000 * 1000); | |
453 | long long int long_delta_ms; | |
454 | u32 delta_ms; | |
455 | u32 cost; | |
456 | int i, band_exceeded_max = -1; | |
457 | u32 band_exceeded_rate = 0; | |
458 | ||
459 | meter = lookup_meter(dp, meter_id); | |
460 | /* Do not drop the packet when there is no meter. */ | |
461 | if (!meter) | |
462 | return false; | |
463 | ||
464 | /* Lock the meter while using it. */ | |
465 | spin_lock(&meter->lock); | |
466 | ||
467 | long_delta_ms = (now_ms - meter->used); /* ms */ | |
468 | ||
469 | /* Make sure delta_ms will not be too large, so that bucket will not | |
470 | * wrap around below. | |
471 | */ | |
472 | delta_ms = (long_delta_ms > (long long int)meter->max_delta_t) | |
473 | ? meter->max_delta_t : (u32)long_delta_ms; | |
474 | ||
475 | /* Update meter statistics. | |
476 | */ | |
477 | meter->used = now_ms; | |
478 | meter->stats.n_packets += 1; | |
479 | meter->stats.n_bytes += skb->len; | |
480 | ||
481 | /* Bucket rate is either in kilobits per second, or in packets per | |
482 | * second. We maintain the bucket in the units of either bits or | |
483 | * 1/1000th of a packet, correspondingly. | |
484 | * Then, when rate is multiplied with milliseconds, we get the | |
485 | * bucket units: | |
486 | * msec * kbps = bits, and | |
487 | * msec * packets/sec = 1/1000 packets. | |
488 | * | |
489 | * 'cost' is the number of bucket units in this packet. | |
490 | */ | |
491 | cost = (meter->kbps) ? skb->len * 8 : 1000; | |
492 | ||
493 | /* Update all bands and find the one hit with the highest rate. */ | |
494 | for (i = 0; i < meter->n_bands; ++i) { | |
495 | long long int max_bucket_size; | |
496 | ||
497 | band = &meter->bands[i]; | |
498 | max_bucket_size = (band->burst_size + band->rate) * 1000; | |
499 | ||
500 | band->bucket += delta_ms * band->rate; | |
501 | if (band->bucket > max_bucket_size) | |
502 | band->bucket = max_bucket_size; | |
503 | ||
504 | if (band->bucket >= cost) { | |
505 | band->bucket -= cost; | |
506 | } else if (band->rate > band_exceeded_rate) { | |
507 | band_exceeded_rate = band->rate; | |
508 | band_exceeded_max = i; | |
509 | } | |
510 | } | |
511 | ||
512 | if (band_exceeded_max >= 0) { | |
513 | /* Update band statistics. */ | |
514 | band = &meter->bands[band_exceeded_max]; | |
515 | band->stats.n_packets += 1; | |
516 | band->stats.n_bytes += skb->len; | |
517 | ||
518 | /* Drop band triggered, let the caller drop the 'skb'. */ | |
519 | if (band->type == OVS_METER_BAND_TYPE_DROP) { | |
520 | spin_unlock(&meter->lock); | |
521 | return true; | |
522 | } | |
523 | } | |
524 | ||
525 | spin_unlock(&meter->lock); | |
526 | return false; | |
527 | } | |
528 | ||
529 | static struct genl_ops dp_meter_genl_ops[] = { | |
530 | { .cmd = OVS_METER_CMD_FEATURES, | |
531 | .flags = 0, /* OK for unprivileged users. */ | |
532 | .policy = meter_policy, | |
533 | .doit = ovs_meter_cmd_features | |
534 | }, | |
535 | { .cmd = OVS_METER_CMD_SET, | |
536 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN | |
537 | * privilege. | |
538 | */ | |
539 | .policy = meter_policy, | |
540 | .doit = ovs_meter_cmd_set, | |
541 | }, | |
542 | { .cmd = OVS_METER_CMD_GET, | |
543 | .flags = 0, /* OK for unprivileged users. */ | |
544 | .policy = meter_policy, | |
545 | .doit = ovs_meter_cmd_get, | |
546 | }, | |
547 | { .cmd = OVS_METER_CMD_DEL, | |
548 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN | |
549 | * privilege. | |
550 | */ | |
551 | .policy = meter_policy, | |
552 | .doit = ovs_meter_cmd_del | |
553 | }, | |
554 | }; | |
555 | ||
556 | static const struct genl_multicast_group ovs_meter_multicast_group = { | |
557 | .name = OVS_METER_MCGROUP, | |
558 | }; | |
559 | ||
560 | struct genl_family dp_meter_genl_family __ro_after_init = { | |
561 | .hdrsize = sizeof(struct ovs_header), | |
562 | .name = OVS_METER_FAMILY, | |
563 | .version = OVS_METER_VERSION, | |
564 | .maxattr = OVS_METER_ATTR_MAX, | |
565 | .netnsok = true, | |
566 | .parallel_ops = true, | |
567 | .ops = dp_meter_genl_ops, | |
568 | .n_ops = ARRAY_SIZE(dp_meter_genl_ops), | |
569 | .mcgrps = &ovs_meter_multicast_group, | |
570 | .n_mcgrps = 1, | |
571 | .module = THIS_MODULE, | |
572 | }; | |
573 | ||
574 | int ovs_meters_init(struct datapath *dp) | |
575 | { | |
576 | int i; | |
577 | ||
578 | dp->meters = kmalloc_array(METER_HASH_BUCKETS, | |
579 | sizeof(struct hlist_head), GFP_KERNEL); | |
580 | ||
581 | if (!dp->meters) | |
582 | return -ENOMEM; | |
583 | ||
584 | for (i = 0; i < METER_HASH_BUCKETS; i++) | |
585 | INIT_HLIST_HEAD(&dp->meters[i]); | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | void ovs_meters_exit(struct datapath *dp) | |
591 | { | |
592 | int i; | |
593 | ||
594 | for (i = 0; i < METER_HASH_BUCKETS; i++) { | |
595 | struct hlist_head *head = &dp->meters[i]; | |
596 | struct dp_meter *meter; | |
597 | struct hlist_node *n; | |
598 | ||
599 | hlist_for_each_entry_safe(meter, n, head, dp_hash_node) | |
600 | kfree(meter); | |
601 | } | |
602 | ||
603 | kfree(dp->meters); | |
604 | } |