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e6445719 | 1 | /* |
9b996e54 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
e6445719 PS |
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 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #include "flow.h" | |
20 | #include "datapath.h" | |
34ae932a | 21 | #include "flow_netlink.h" |
e6445719 PS |
22 | #include <linux/uaccess.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/if_ether.h> | |
26 | #include <linux/if_vlan.h> | |
27 | #include <net/llc_pdu.h> | |
28 | #include <linux/kernel.h> | |
87545899 | 29 | #include <linux/jhash.h> |
e6445719 PS |
30 | #include <linux/jiffies.h> |
31 | #include <linux/llc.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/in.h> | |
34 | #include <linux/rcupdate.h> | |
db74a333 | 35 | #include <linux/cpumask.h> |
e6445719 PS |
36 | #include <linux/if_arp.h> |
37 | #include <linux/ip.h> | |
38 | #include <linux/ipv6.h> | |
39 | #include <linux/sctp.h> | |
40 | #include <linux/tcp.h> | |
41 | #include <linux/udp.h> | |
42 | #include <linux/icmp.h> | |
43 | #include <linux/icmpv6.h> | |
44 | #include <linux/rculist.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/ipv6.h> | |
47 | #include <net/ndisc.h> | |
48 | ||
b637e498 PS |
49 | #define TBL_MIN_BUCKETS 1024 |
50 | #define REHASH_INTERVAL (10 * 60 * HZ) | |
51 | ||
e6445719 | 52 | static struct kmem_cache *flow_cache; |
63e7959c | 53 | struct kmem_cache *flow_stats_cache __read_mostly; |
e6445719 PS |
54 | |
55 | static u16 range_n_bytes(const struct sw_flow_key_range *range) | |
56 | { | |
57 | return range->end - range->start; | |
58 | } | |
59 | ||
60 | void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src, | |
ae5f2fb1 | 61 | bool full, const struct sw_flow_mask *mask) |
e6445719 | 62 | { |
ae5f2fb1 JG |
63 | int start = full ? 0 : mask->range.start; |
64 | int len = full ? sizeof *dst : range_n_bytes(&mask->range); | |
65 | const long *m = (const long *)((const u8 *)&mask->key + start); | |
66 | const long *s = (const long *)((const u8 *)src + start); | |
67 | long *d = (long *)((u8 *)dst + start); | |
e6445719 PS |
68 | int i; |
69 | ||
ae5f2fb1 JG |
70 | /* If 'full' is true then all of 'dst' is fully initialized. Otherwise, |
71 | * if 'full' is false the memory outside of the 'mask->range' is left | |
72 | * uninitialized. This can be used as an optimization when further | |
73 | * operations on 'dst' only use contents within 'mask->range'. | |
e6445719 | 74 | */ |
ae5f2fb1 | 75 | for (i = 0; i < len; i += sizeof(long)) |
e6445719 PS |
76 | *d++ = *s++ & *m++; |
77 | } | |
78 | ||
23dabf88 | 79 | struct sw_flow *ovs_flow_alloc(void) |
e6445719 PS |
80 | { |
81 | struct sw_flow *flow; | |
63e7959c | 82 | struct flow_stats *stats; |
e6445719 | 83 | |
db74a333 | 84 | flow = kmem_cache_zalloc(flow_cache, GFP_KERNEL); |
e6445719 PS |
85 | if (!flow) |
86 | return ERR_PTR(-ENOMEM); | |
87 | ||
db74a333 | 88 | flow->stats_last_writer = -1; |
e6445719 | 89 | |
63e7959c JR |
90 | /* Initialize the default stat node. */ |
91 | stats = kmem_cache_alloc_node(flow_stats_cache, | |
598c12d0 KK |
92 | GFP_KERNEL | __GFP_ZERO, |
93 | node_online(0) ? 0 : NUMA_NO_NODE); | |
63e7959c | 94 | if (!stats) |
23dabf88 | 95 | goto err; |
e298e505 | 96 | |
63e7959c JR |
97 | spin_lock_init(&stats->lock); |
98 | ||
99 | RCU_INIT_POINTER(flow->stats[0], stats); | |
100 | ||
c4b2bf6b TZ |
101 | cpumask_set_cpu(0, &flow->cpu_used_mask); |
102 | ||
e6445719 | 103 | return flow; |
e298e505 | 104 | err: |
ece37c87 | 105 | kmem_cache_free(flow_cache, flow); |
e298e505 | 106 | return ERR_PTR(-ENOMEM); |
e6445719 PS |
107 | } |
108 | ||
12eb18f7 | 109 | int ovs_flow_tbl_count(const struct flow_table *table) |
b637e498 PS |
110 | { |
111 | return table->count; | |
112 | } | |
113 | ||
e6445719 PS |
114 | static struct flex_array *alloc_buckets(unsigned int n_buckets) |
115 | { | |
116 | struct flex_array *buckets; | |
117 | int i, err; | |
118 | ||
119 | buckets = flex_array_alloc(sizeof(struct hlist_head), | |
120 | n_buckets, GFP_KERNEL); | |
121 | if (!buckets) | |
122 | return NULL; | |
123 | ||
124 | err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL); | |
125 | if (err) { | |
126 | flex_array_free(buckets); | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | for (i = 0; i < n_buckets; i++) | |
131 | INIT_HLIST_HEAD((struct hlist_head *) | |
132 | flex_array_get(buckets, i)); | |
133 | ||
134 | return buckets; | |
135 | } | |
136 | ||
137 | static void flow_free(struct sw_flow *flow) | |
138 | { | |
db74a333 | 139 | int cpu; |
63e7959c | 140 | |
74ed7ab9 JS |
141 | if (ovs_identifier_is_key(&flow->id)) |
142 | kfree(flow->id.unmasked_key); | |
34ae932a TG |
143 | if (flow->sf_acts) |
144 | ovs_nla_free_flow_actions((struct sw_flow_actions __force *)flow->sf_acts); | |
db74a333 | 145 | /* We open code this to make sure cpu 0 is always considered */ |
c4b2bf6b | 146 | for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) |
db74a333 | 147 | if (flow->stats[cpu]) |
63e7959c | 148 | kmem_cache_free(flow_stats_cache, |
db74a333 | 149 | (struct flow_stats __force *)flow->stats[cpu]); |
e6445719 PS |
150 | kmem_cache_free(flow_cache, flow); |
151 | } | |
152 | ||
153 | static void rcu_free_flow_callback(struct rcu_head *rcu) | |
154 | { | |
155 | struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); | |
156 | ||
157 | flow_free(flow); | |
158 | } | |
159 | ||
e80857cc | 160 | void ovs_flow_free(struct sw_flow *flow, bool deferred) |
618ed0c8 | 161 | { |
e80857cc | 162 | if (!flow) |
618ed0c8 PS |
163 | return; |
164 | ||
e6445719 PS |
165 | if (deferred) |
166 | call_rcu(&flow->rcu, rcu_free_flow_callback); | |
167 | else | |
168 | flow_free(flow); | |
169 | } | |
170 | ||
171 | static void free_buckets(struct flex_array *buckets) | |
172 | { | |
173 | flex_array_free(buckets); | |
174 | } | |
175 | ||
e80857cc | 176 | |
b637e498 | 177 | static void __table_instance_destroy(struct table_instance *ti) |
e6445719 | 178 | { |
b637e498 PS |
179 | free_buckets(ti->buckets); |
180 | kfree(ti); | |
e6445719 PS |
181 | } |
182 | ||
b637e498 | 183 | static struct table_instance *table_instance_alloc(int new_size) |
e6445719 | 184 | { |
b637e498 | 185 | struct table_instance *ti = kmalloc(sizeof(*ti), GFP_KERNEL); |
e6445719 | 186 | |
b637e498 | 187 | if (!ti) |
e6445719 PS |
188 | return NULL; |
189 | ||
b637e498 | 190 | ti->buckets = alloc_buckets(new_size); |
e6445719 | 191 | |
b637e498 PS |
192 | if (!ti->buckets) { |
193 | kfree(ti); | |
e6445719 PS |
194 | return NULL; |
195 | } | |
b637e498 PS |
196 | ti->n_buckets = new_size; |
197 | ti->node_ver = 0; | |
198 | ti->keep_flows = false; | |
199 | get_random_bytes(&ti->hash_seed, sizeof(u32)); | |
e6445719 | 200 | |
b637e498 | 201 | return ti; |
e6445719 PS |
202 | } |
203 | ||
b637e498 | 204 | int ovs_flow_tbl_init(struct flow_table *table) |
e6445719 | 205 | { |
74ed7ab9 | 206 | struct table_instance *ti, *ufid_ti; |
e6445719 | 207 | |
b637e498 | 208 | ti = table_instance_alloc(TBL_MIN_BUCKETS); |
e6445719 | 209 | |
b637e498 PS |
210 | if (!ti) |
211 | return -ENOMEM; | |
e6445719 | 212 | |
74ed7ab9 JS |
213 | ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
214 | if (!ufid_ti) | |
215 | goto free_ti; | |
216 | ||
b637e498 | 217 | rcu_assign_pointer(table->ti, ti); |
74ed7ab9 | 218 | rcu_assign_pointer(table->ufid_ti, ufid_ti); |
b637e498 PS |
219 | INIT_LIST_HEAD(&table->mask_list); |
220 | table->last_rehash = jiffies; | |
221 | table->count = 0; | |
74ed7ab9 | 222 | table->ufid_count = 0; |
b637e498 | 223 | return 0; |
74ed7ab9 JS |
224 | |
225 | free_ti: | |
226 | __table_instance_destroy(ti); | |
227 | return -ENOMEM; | |
e6445719 PS |
228 | } |
229 | ||
230 | static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) | |
231 | { | |
b637e498 | 232 | struct table_instance *ti = container_of(rcu, struct table_instance, rcu); |
e6445719 | 233 | |
b637e498 | 234 | __table_instance_destroy(ti); |
e6445719 PS |
235 | } |
236 | ||
74ed7ab9 JS |
237 | static void table_instance_destroy(struct table_instance *ti, |
238 | struct table_instance *ufid_ti, | |
239 | bool deferred) | |
e6445719 | 240 | { |
e80857cc AZ |
241 | int i; |
242 | ||
b637e498 | 243 | if (!ti) |
e6445719 PS |
244 | return; |
245 | ||
74ed7ab9 | 246 | BUG_ON(!ufid_ti); |
e80857cc AZ |
247 | if (ti->keep_flows) |
248 | goto skip_flows; | |
249 | ||
250 | for (i = 0; i < ti->n_buckets; i++) { | |
251 | struct sw_flow *flow; | |
252 | struct hlist_head *head = flex_array_get(ti->buckets, i); | |
253 | struct hlist_node *n; | |
254 | int ver = ti->node_ver; | |
74ed7ab9 | 255 | int ufid_ver = ufid_ti->node_ver; |
e80857cc | 256 | |
74ed7ab9 JS |
257 | hlist_for_each_entry_safe(flow, n, head, flow_table.node[ver]) { |
258 | hlist_del_rcu(&flow->flow_table.node[ver]); | |
259 | if (ovs_identifier_is_ufid(&flow->id)) | |
260 | hlist_del_rcu(&flow->ufid_table.node[ufid_ver]); | |
e80857cc AZ |
261 | ovs_flow_free(flow, deferred); |
262 | } | |
263 | } | |
264 | ||
265 | skip_flows: | |
74ed7ab9 | 266 | if (deferred) { |
b637e498 | 267 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); |
74ed7ab9 JS |
268 | call_rcu(&ufid_ti->rcu, flow_tbl_destroy_rcu_cb); |
269 | } else { | |
b637e498 | 270 | __table_instance_destroy(ti); |
74ed7ab9 JS |
271 | __table_instance_destroy(ufid_ti); |
272 | } | |
b637e498 PS |
273 | } |
274 | ||
9b996e54 PS |
275 | /* No need for locking this function is called from RCU callback or |
276 | * error path. | |
277 | */ | |
278 | void ovs_flow_tbl_destroy(struct flow_table *table) | |
b637e498 | 279 | { |
9b996e54 | 280 | struct table_instance *ti = rcu_dereference_raw(table->ti); |
74ed7ab9 | 281 | struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti); |
b637e498 | 282 | |
74ed7ab9 | 283 | table_instance_destroy(ti, ufid_ti, false); |
e6445719 PS |
284 | } |
285 | ||
b637e498 | 286 | struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti, |
e6445719 PS |
287 | u32 *bucket, u32 *last) |
288 | { | |
289 | struct sw_flow *flow; | |
290 | struct hlist_head *head; | |
291 | int ver; | |
292 | int i; | |
293 | ||
b637e498 PS |
294 | ver = ti->node_ver; |
295 | while (*bucket < ti->n_buckets) { | |
e6445719 | 296 | i = 0; |
b637e498 | 297 | head = flex_array_get(ti->buckets, *bucket); |
74ed7ab9 | 298 | hlist_for_each_entry_rcu(flow, head, flow_table.node[ver]) { |
e6445719 PS |
299 | if (i < *last) { |
300 | i++; | |
301 | continue; | |
302 | } | |
303 | *last = i + 1; | |
304 | return flow; | |
305 | } | |
306 | (*bucket)++; | |
307 | *last = 0; | |
308 | } | |
309 | ||
310 | return NULL; | |
311 | } | |
312 | ||
b637e498 | 313 | static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash) |
e6445719 | 314 | { |
b637e498 PS |
315 | hash = jhash_1word(hash, ti->hash_seed); |
316 | return flex_array_get(ti->buckets, | |
317 | (hash & (ti->n_buckets - 1))); | |
e6445719 PS |
318 | } |
319 | ||
74ed7ab9 JS |
320 | static void table_instance_insert(struct table_instance *ti, |
321 | struct sw_flow *flow) | |
e6445719 PS |
322 | { |
323 | struct hlist_head *head; | |
324 | ||
74ed7ab9 JS |
325 | head = find_bucket(ti, flow->flow_table.hash); |
326 | hlist_add_head_rcu(&flow->flow_table.node[ti->node_ver], head); | |
327 | } | |
328 | ||
329 | static void ufid_table_instance_insert(struct table_instance *ti, | |
330 | struct sw_flow *flow) | |
331 | { | |
332 | struct hlist_head *head; | |
333 | ||
334 | head = find_bucket(ti, flow->ufid_table.hash); | |
335 | hlist_add_head_rcu(&flow->ufid_table.node[ti->node_ver], head); | |
e6445719 PS |
336 | } |
337 | ||
b637e498 | 338 | static void flow_table_copy_flows(struct table_instance *old, |
74ed7ab9 | 339 | struct table_instance *new, bool ufid) |
e6445719 PS |
340 | { |
341 | int old_ver; | |
342 | int i; | |
343 | ||
344 | old_ver = old->node_ver; | |
345 | new->node_ver = !old_ver; | |
346 | ||
347 | /* Insert in new table. */ | |
348 | for (i = 0; i < old->n_buckets; i++) { | |
349 | struct sw_flow *flow; | |
350 | struct hlist_head *head; | |
351 | ||
352 | head = flex_array_get(old->buckets, i); | |
353 | ||
74ed7ab9 JS |
354 | if (ufid) |
355 | hlist_for_each_entry(flow, head, | |
356 | ufid_table.node[old_ver]) | |
357 | ufid_table_instance_insert(new, flow); | |
358 | else | |
359 | hlist_for_each_entry(flow, head, | |
360 | flow_table.node[old_ver]) | |
361 | table_instance_insert(new, flow); | |
e6445719 PS |
362 | } |
363 | ||
e6445719 PS |
364 | old->keep_flows = true; |
365 | } | |
366 | ||
b637e498 | 367 | static struct table_instance *table_instance_rehash(struct table_instance *ti, |
74ed7ab9 | 368 | int n_buckets, bool ufid) |
e6445719 | 369 | { |
b637e498 | 370 | struct table_instance *new_ti; |
e6445719 | 371 | |
b637e498 PS |
372 | new_ti = table_instance_alloc(n_buckets); |
373 | if (!new_ti) | |
618ed0c8 | 374 | return NULL; |
e6445719 | 375 | |
74ed7ab9 | 376 | flow_table_copy_flows(ti, new_ti, ufid); |
e6445719 | 377 | |
b637e498 | 378 | return new_ti; |
e6445719 PS |
379 | } |
380 | ||
b637e498 | 381 | int ovs_flow_tbl_flush(struct flow_table *flow_table) |
e6445719 | 382 | { |
74ed7ab9 JS |
383 | struct table_instance *old_ti, *new_ti; |
384 | struct table_instance *old_ufid_ti, *new_ufid_ti; | |
e6445719 | 385 | |
b637e498 PS |
386 | new_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
387 | if (!new_ti) | |
388 | return -ENOMEM; | |
74ed7ab9 JS |
389 | new_ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
390 | if (!new_ufid_ti) | |
391 | goto err_free_ti; | |
392 | ||
393 | old_ti = ovsl_dereference(flow_table->ti); | |
394 | old_ufid_ti = ovsl_dereference(flow_table->ufid_ti); | |
b637e498 PS |
395 | |
396 | rcu_assign_pointer(flow_table->ti, new_ti); | |
74ed7ab9 | 397 | rcu_assign_pointer(flow_table->ufid_ti, new_ufid_ti); |
b637e498 PS |
398 | flow_table->last_rehash = jiffies; |
399 | flow_table->count = 0; | |
74ed7ab9 | 400 | flow_table->ufid_count = 0; |
b637e498 | 401 | |
74ed7ab9 | 402 | table_instance_destroy(old_ti, old_ufid_ti, true); |
b637e498 | 403 | return 0; |
74ed7ab9 JS |
404 | |
405 | err_free_ti: | |
406 | __table_instance_destroy(new_ti); | |
407 | return -ENOMEM; | |
e6445719 PS |
408 | } |
409 | ||
272c2cf8 JS |
410 | static u32 flow_hash(const struct sw_flow_key *key, |
411 | const struct sw_flow_key_range *range) | |
e6445719 | 412 | { |
272c2cf8 JS |
413 | int key_start = range->start; |
414 | int key_end = range->end; | |
7085130b | 415 | const u32 *hash_key = (const u32 *)((const u8 *)key + key_start); |
e6445719 PS |
416 | int hash_u32s = (key_end - key_start) >> 2; |
417 | ||
418 | /* Make sure number of hash bytes are multiple of u32. */ | |
419 | BUILD_BUG_ON(sizeof(long) % sizeof(u32)); | |
420 | ||
87545899 | 421 | return jhash2(hash_key, hash_u32s, 0); |
e6445719 PS |
422 | } |
423 | ||
424 | static int flow_key_start(const struct sw_flow_key *key) | |
425 | { | |
00a93bab | 426 | if (key->tun_proto) |
e6445719 PS |
427 | return 0; |
428 | else | |
429 | return rounddown(offsetof(struct sw_flow_key, phy), | |
430 | sizeof(long)); | |
431 | } | |
432 | ||
433 | static bool cmp_key(const struct sw_flow_key *key1, | |
434 | const struct sw_flow_key *key2, | |
435 | int key_start, int key_end) | |
436 | { | |
7085130b DDP |
437 | const long *cp1 = (const long *)((const u8 *)key1 + key_start); |
438 | const long *cp2 = (const long *)((const u8 *)key2 + key_start); | |
e6445719 PS |
439 | long diffs = 0; |
440 | int i; | |
441 | ||
442 | for (i = key_start; i < key_end; i += sizeof(long)) | |
443 | diffs |= *cp1++ ^ *cp2++; | |
444 | ||
445 | return diffs == 0; | |
446 | } | |
447 | ||
448 | static bool flow_cmp_masked_key(const struct sw_flow *flow, | |
449 | const struct sw_flow_key *key, | |
272c2cf8 | 450 | const struct sw_flow_key_range *range) |
e6445719 | 451 | { |
272c2cf8 | 452 | return cmp_key(&flow->key, key, range->start, range->end); |
e6445719 PS |
453 | } |
454 | ||
74ed7ab9 JS |
455 | static bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow, |
456 | const struct sw_flow_match *match) | |
e6445719 PS |
457 | { |
458 | struct sw_flow_key *key = match->key; | |
459 | int key_start = flow_key_start(key); | |
460 | int key_end = match->range.end; | |
461 | ||
74ed7ab9 JS |
462 | BUG_ON(ovs_identifier_is_ufid(&flow->id)); |
463 | return cmp_key(flow->id.unmasked_key, key, key_start, key_end); | |
e6445719 PS |
464 | } |
465 | ||
b637e498 | 466 | static struct sw_flow *masked_flow_lookup(struct table_instance *ti, |
e6445719 | 467 | const struct sw_flow_key *unmasked, |
12eb18f7 | 468 | const struct sw_flow_mask *mask) |
e6445719 PS |
469 | { |
470 | struct sw_flow *flow; | |
471 | struct hlist_head *head; | |
e6445719 PS |
472 | u32 hash; |
473 | struct sw_flow_key masked_key; | |
474 | ||
ae5f2fb1 | 475 | ovs_flow_mask_key(&masked_key, unmasked, false, mask); |
272c2cf8 | 476 | hash = flow_hash(&masked_key, &mask->range); |
b637e498 | 477 | head = find_bucket(ti, hash); |
74ed7ab9 JS |
478 | hlist_for_each_entry_rcu(flow, head, flow_table.node[ti->node_ver]) { |
479 | if (flow->mask == mask && flow->flow_table.hash == hash && | |
272c2cf8 | 480 | flow_cmp_masked_key(flow, &masked_key, &mask->range)) |
e6445719 PS |
481 | return flow; |
482 | } | |
483 | return NULL; | |
484 | } | |
485 | ||
5bb50632 | 486 | struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl, |
1bd7116f AZ |
487 | const struct sw_flow_key *key, |
488 | u32 *n_mask_hit) | |
e6445719 | 489 | { |
663efa36 | 490 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ti); |
e6445719 | 491 | struct sw_flow_mask *mask; |
b637e498 | 492 | struct sw_flow *flow; |
e6445719 | 493 | |
1bd7116f | 494 | *n_mask_hit = 0; |
b637e498 | 495 | list_for_each_entry_rcu(mask, &tbl->mask_list, list) { |
1bd7116f | 496 | (*n_mask_hit)++; |
b637e498 | 497 | flow = masked_flow_lookup(ti, key, mask); |
e6445719 | 498 | if (flow) /* Found */ |
b637e498 | 499 | return flow; |
e6445719 | 500 | } |
b637e498 PS |
501 | return NULL; |
502 | } | |
e6445719 | 503 | |
5bb50632 AZ |
504 | struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl, |
505 | const struct sw_flow_key *key) | |
506 | { | |
507 | u32 __always_unused n_mask_hit; | |
508 | ||
509 | return ovs_flow_tbl_lookup_stats(tbl, key, &n_mask_hit); | |
510 | } | |
511 | ||
4a46b24e | 512 | struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl, |
12eb18f7 | 513 | const struct sw_flow_match *match) |
4a46b24e AW |
514 | { |
515 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ti); | |
516 | struct sw_flow_mask *mask; | |
517 | struct sw_flow *flow; | |
518 | ||
519 | /* Always called under ovs-mutex. */ | |
520 | list_for_each_entry(mask, &tbl->mask_list, list) { | |
521 | flow = masked_flow_lookup(ti, match->key, mask); | |
74ed7ab9 JS |
522 | if (flow && ovs_identifier_is_key(&flow->id) && |
523 | ovs_flow_cmp_unmasked_key(flow, match)) | |
524 | return flow; | |
525 | } | |
526 | return NULL; | |
527 | } | |
528 | ||
529 | static u32 ufid_hash(const struct sw_flow_id *sfid) | |
530 | { | |
531 | return jhash(sfid->ufid, sfid->ufid_len, 0); | |
532 | } | |
533 | ||
534 | static bool ovs_flow_cmp_ufid(const struct sw_flow *flow, | |
535 | const struct sw_flow_id *sfid) | |
536 | { | |
537 | if (flow->id.ufid_len != sfid->ufid_len) | |
538 | return false; | |
539 | ||
540 | return !memcmp(flow->id.ufid, sfid->ufid, sfid->ufid_len); | |
541 | } | |
542 | ||
543 | bool ovs_flow_cmp(const struct sw_flow *flow, const struct sw_flow_match *match) | |
544 | { | |
545 | if (ovs_identifier_is_ufid(&flow->id)) | |
546 | return flow_cmp_masked_key(flow, match->key, &match->range); | |
547 | ||
548 | return ovs_flow_cmp_unmasked_key(flow, match); | |
549 | } | |
550 | ||
551 | struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *tbl, | |
552 | const struct sw_flow_id *ufid) | |
553 | { | |
554 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ufid_ti); | |
555 | struct sw_flow *flow; | |
556 | struct hlist_head *head; | |
557 | u32 hash; | |
558 | ||
559 | hash = ufid_hash(ufid); | |
560 | head = find_bucket(ti, hash); | |
561 | hlist_for_each_entry_rcu(flow, head, ufid_table.node[ti->node_ver]) { | |
562 | if (flow->ufid_table.hash == hash && | |
563 | ovs_flow_cmp_ufid(flow, ufid)) | |
4a46b24e AW |
564 | return flow; |
565 | } | |
566 | return NULL; | |
567 | } | |
568 | ||
1bd7116f AZ |
569 | int ovs_flow_tbl_num_masks(const struct flow_table *table) |
570 | { | |
571 | struct sw_flow_mask *mask; | |
572 | int num = 0; | |
573 | ||
574 | list_for_each_entry(mask, &table->mask_list, list) | |
575 | num++; | |
576 | ||
577 | return num; | |
578 | } | |
579 | ||
74ed7ab9 JS |
580 | static struct table_instance *table_instance_expand(struct table_instance *ti, |
581 | bool ufid) | |
b637e498 | 582 | { |
74ed7ab9 | 583 | return table_instance_rehash(ti, ti->n_buckets * 2, ufid); |
e6445719 PS |
584 | } |
585 | ||
56c19868 JR |
586 | /* Remove 'mask' from the mask list, if it is not needed any more. */ |
587 | static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask) | |
588 | { | |
589 | if (mask) { | |
590 | /* ovs-lock is required to protect mask-refcount and | |
591 | * mask list. | |
592 | */ | |
593 | ASSERT_OVSL(); | |
594 | BUG_ON(!mask->ref_count); | |
595 | mask->ref_count--; | |
596 | ||
597 | if (!mask->ref_count) { | |
598 | list_del_rcu(&mask->list); | |
599 | kfree_rcu(mask, rcu); | |
600 | } | |
601 | } | |
602 | } | |
603 | ||
604 | /* Must be called with OVS mutex held. */ | |
e6445719 PS |
605 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow) |
606 | { | |
b637e498 | 607 | struct table_instance *ti = ovsl_dereference(table->ti); |
74ed7ab9 | 608 | struct table_instance *ufid_ti = ovsl_dereference(table->ufid_ti); |
b637e498 | 609 | |
e6445719 | 610 | BUG_ON(table->count == 0); |
74ed7ab9 | 611 | hlist_del_rcu(&flow->flow_table.node[ti->node_ver]); |
e6445719 | 612 | table->count--; |
74ed7ab9 JS |
613 | if (ovs_identifier_is_ufid(&flow->id)) { |
614 | hlist_del_rcu(&flow->ufid_table.node[ufid_ti->node_ver]); | |
615 | table->ufid_count--; | |
616 | } | |
56c19868 JR |
617 | |
618 | /* RCU delete the mask. 'flow->mask' is not NULLed, as it should be | |
619 | * accessible as long as the RCU read lock is held. | |
620 | */ | |
621 | flow_mask_remove(table, flow->mask); | |
e6445719 PS |
622 | } |
623 | ||
618ed0c8 | 624 | static struct sw_flow_mask *mask_alloc(void) |
e6445719 PS |
625 | { |
626 | struct sw_flow_mask *mask; | |
627 | ||
628 | mask = kmalloc(sizeof(*mask), GFP_KERNEL); | |
629 | if (mask) | |
e80857cc | 630 | mask->ref_count = 1; |
e6445719 PS |
631 | |
632 | return mask; | |
633 | } | |
634 | ||
e6445719 PS |
635 | static bool mask_equal(const struct sw_flow_mask *a, |
636 | const struct sw_flow_mask *b) | |
637 | { | |
7085130b DDP |
638 | const u8 *a_ = (const u8 *)&a->key + a->range.start; |
639 | const u8 *b_ = (const u8 *)&b->key + b->range.start; | |
e6445719 PS |
640 | |
641 | return (a->range.end == b->range.end) | |
642 | && (a->range.start == b->range.start) | |
643 | && (memcmp(a_, b_, range_n_bytes(&a->range)) == 0); | |
644 | } | |
645 | ||
618ed0c8 | 646 | static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl, |
e6445719 PS |
647 | const struct sw_flow_mask *mask) |
648 | { | |
649 | struct list_head *ml; | |
650 | ||
b637e498 | 651 | list_for_each(ml, &tbl->mask_list) { |
e6445719 PS |
652 | struct sw_flow_mask *m; |
653 | m = container_of(ml, struct sw_flow_mask, list); | |
654 | if (mask_equal(mask, m)) | |
655 | return m; | |
656 | } | |
657 | ||
658 | return NULL; | |
659 | } | |
660 | ||
d1211908 | 661 | /* Add 'mask' into the mask list, if it is not already there. */ |
618ed0c8 | 662 | static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow, |
12eb18f7 | 663 | const struct sw_flow_mask *new) |
618ed0c8 PS |
664 | { |
665 | struct sw_flow_mask *mask; | |
666 | mask = flow_mask_find(tbl, new); | |
667 | if (!mask) { | |
668 | /* Allocate a new mask if none exsits. */ | |
669 | mask = mask_alloc(); | |
670 | if (!mask) | |
671 | return -ENOMEM; | |
672 | mask->key = new->key; | |
673 | mask->range = new->range; | |
674 | list_add_rcu(&mask->list, &tbl->mask_list); | |
e80857cc AZ |
675 | } else { |
676 | BUG_ON(!mask->ref_count); | |
677 | mask->ref_count++; | |
618ed0c8 PS |
678 | } |
679 | ||
618ed0c8 PS |
680 | flow->mask = mask; |
681 | return 0; | |
682 | } | |
683 | ||
56c19868 | 684 | /* Must be called with OVS mutex held. */ |
d29ab6f8 | 685 | static void flow_key_insert(struct flow_table *table, struct sw_flow *flow) |
e6445719 | 686 | { |
618ed0c8 PS |
687 | struct table_instance *new_ti = NULL; |
688 | struct table_instance *ti; | |
618ed0c8 | 689 | |
74ed7ab9 | 690 | flow->flow_table.hash = flow_hash(&flow->key, &flow->mask->range); |
618ed0c8 PS |
691 | ti = ovsl_dereference(table->ti); |
692 | table_instance_insert(ti, flow); | |
693 | table->count++; | |
694 | ||
695 | /* Expand table, if necessary, to make room. */ | |
696 | if (table->count > ti->n_buckets) | |
74ed7ab9 | 697 | new_ti = table_instance_expand(ti, false); |
618ed0c8 | 698 | else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL)) |
74ed7ab9 | 699 | new_ti = table_instance_rehash(ti, ti->n_buckets, false); |
618ed0c8 PS |
700 | |
701 | if (new_ti) { | |
702 | rcu_assign_pointer(table->ti, new_ti); | |
74ed7ab9 | 703 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); |
618ed0c8 PS |
704 | table->last_rehash = jiffies; |
705 | } | |
d29ab6f8 JS |
706 | } |
707 | ||
74ed7ab9 JS |
708 | /* Must be called with OVS mutex held. */ |
709 | static void flow_ufid_insert(struct flow_table *table, struct sw_flow *flow) | |
710 | { | |
711 | struct table_instance *ti; | |
712 | ||
713 | flow->ufid_table.hash = ufid_hash(&flow->id); | |
714 | ti = ovsl_dereference(table->ufid_ti); | |
715 | ufid_table_instance_insert(ti, flow); | |
716 | table->ufid_count++; | |
717 | ||
718 | /* Expand table, if necessary, to make room. */ | |
719 | if (table->ufid_count > ti->n_buckets) { | |
720 | struct table_instance *new_ti; | |
721 | ||
722 | new_ti = table_instance_expand(ti, true); | |
723 | if (new_ti) { | |
724 | rcu_assign_pointer(table->ufid_ti, new_ti); | |
725 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); | |
726 | } | |
727 | } | |
728 | } | |
729 | ||
d29ab6f8 JS |
730 | /* Must be called with OVS mutex held. */ |
731 | int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow, | |
732 | const struct sw_flow_mask *mask) | |
733 | { | |
734 | int err; | |
735 | ||
736 | err = flow_mask_insert(table, flow, mask); | |
737 | if (err) | |
738 | return err; | |
739 | flow_key_insert(table, flow); | |
74ed7ab9 JS |
740 | if (ovs_identifier_is_ufid(&flow->id)) |
741 | flow_ufid_insert(table, flow); | |
d29ab6f8 | 742 | |
618ed0c8 | 743 | return 0; |
e6445719 PS |
744 | } |
745 | ||
746 | /* Initializes the flow module. | |
747 | * Returns zero if successful or a negative error code. */ | |
748 | int ovs_flow_init(void) | |
749 | { | |
750 | BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long)); | |
751 | BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long)); | |
752 | ||
63e7959c | 753 | flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow) |
db74a333 | 754 | + (nr_cpu_ids |
63e7959c JR |
755 | * sizeof(struct flow_stats *)), |
756 | 0, 0, NULL); | |
e6445719 PS |
757 | if (flow_cache == NULL) |
758 | return -ENOMEM; | |
759 | ||
63e7959c JR |
760 | flow_stats_cache |
761 | = kmem_cache_create("sw_flow_stats", sizeof(struct flow_stats), | |
762 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
763 | if (flow_stats_cache == NULL) { | |
764 | kmem_cache_destroy(flow_cache); | |
765 | flow_cache = NULL; | |
766 | return -ENOMEM; | |
767 | } | |
768 | ||
e6445719 PS |
769 | return 0; |
770 | } | |
771 | ||
772 | /* Uninitializes the flow module. */ | |
773 | void ovs_flow_exit(void) | |
774 | { | |
63e7959c | 775 | kmem_cache_destroy(flow_stats_cache); |
e6445719 PS |
776 | kmem_cache_destroy(flow_cache); |
777 | } |