Commit | Line | Data |
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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 void flow_free(struct sw_flow *flow) |
115 | { | |
db74a333 | 116 | int cpu; |
63e7959c | 117 | |
74ed7ab9 JS |
118 | if (ovs_identifier_is_key(&flow->id)) |
119 | kfree(flow->id.unmasked_key); | |
34ae932a TG |
120 | if (flow->sf_acts) |
121 | ovs_nla_free_flow_actions((struct sw_flow_actions __force *)flow->sf_acts); | |
db74a333 | 122 | /* We open code this to make sure cpu 0 is always considered */ |
c4b2bf6b | 123 | for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) |
db74a333 | 124 | if (flow->stats[cpu]) |
63e7959c | 125 | kmem_cache_free(flow_stats_cache, |
db74a333 | 126 | (struct flow_stats __force *)flow->stats[cpu]); |
e6445719 PS |
127 | kmem_cache_free(flow_cache, flow); |
128 | } | |
129 | ||
130 | static void rcu_free_flow_callback(struct rcu_head *rcu) | |
131 | { | |
132 | struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); | |
133 | ||
134 | flow_free(flow); | |
135 | } | |
136 | ||
e80857cc | 137 | void ovs_flow_free(struct sw_flow *flow, bool deferred) |
618ed0c8 | 138 | { |
e80857cc | 139 | if (!flow) |
618ed0c8 PS |
140 | return; |
141 | ||
e6445719 PS |
142 | if (deferred) |
143 | call_rcu(&flow->rcu, rcu_free_flow_callback); | |
144 | else | |
145 | flow_free(flow); | |
146 | } | |
147 | ||
b637e498 | 148 | static void __table_instance_destroy(struct table_instance *ti) |
e6445719 | 149 | { |
ee9c5e67 | 150 | kvfree(ti->buckets); |
b637e498 | 151 | kfree(ti); |
e6445719 PS |
152 | } |
153 | ||
b637e498 | 154 | static struct table_instance *table_instance_alloc(int new_size) |
e6445719 | 155 | { |
b637e498 | 156 | struct table_instance *ti = kmalloc(sizeof(*ti), GFP_KERNEL); |
ee9c5e67 | 157 | int i; |
e6445719 | 158 | |
b637e498 | 159 | if (!ti) |
e6445719 PS |
160 | return NULL; |
161 | ||
ee9c5e67 KO |
162 | ti->buckets = kvmalloc_array(new_size, sizeof(struct hlist_head), |
163 | GFP_KERNEL); | |
b637e498 PS |
164 | if (!ti->buckets) { |
165 | kfree(ti); | |
e6445719 PS |
166 | return NULL; |
167 | } | |
ee9c5e67 KO |
168 | |
169 | for (i = 0; i < new_size; i++) | |
170 | INIT_HLIST_HEAD(&ti->buckets[i]); | |
171 | ||
b637e498 PS |
172 | ti->n_buckets = new_size; |
173 | ti->node_ver = 0; | |
174 | ti->keep_flows = false; | |
175 | get_random_bytes(&ti->hash_seed, sizeof(u32)); | |
e6445719 | 176 | |
b637e498 | 177 | return ti; |
e6445719 PS |
178 | } |
179 | ||
b637e498 | 180 | int ovs_flow_tbl_init(struct flow_table *table) |
e6445719 | 181 | { |
74ed7ab9 | 182 | struct table_instance *ti, *ufid_ti; |
e6445719 | 183 | |
b637e498 | 184 | ti = table_instance_alloc(TBL_MIN_BUCKETS); |
e6445719 | 185 | |
b637e498 PS |
186 | if (!ti) |
187 | return -ENOMEM; | |
e6445719 | 188 | |
74ed7ab9 JS |
189 | ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
190 | if (!ufid_ti) | |
191 | goto free_ti; | |
192 | ||
b637e498 | 193 | rcu_assign_pointer(table->ti, ti); |
74ed7ab9 | 194 | rcu_assign_pointer(table->ufid_ti, ufid_ti); |
b637e498 PS |
195 | INIT_LIST_HEAD(&table->mask_list); |
196 | table->last_rehash = jiffies; | |
197 | table->count = 0; | |
74ed7ab9 | 198 | table->ufid_count = 0; |
b637e498 | 199 | return 0; |
74ed7ab9 JS |
200 | |
201 | free_ti: | |
202 | __table_instance_destroy(ti); | |
203 | return -ENOMEM; | |
e6445719 PS |
204 | } |
205 | ||
206 | static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) | |
207 | { | |
b637e498 | 208 | struct table_instance *ti = container_of(rcu, struct table_instance, rcu); |
e6445719 | 209 | |
b637e498 | 210 | __table_instance_destroy(ti); |
e6445719 PS |
211 | } |
212 | ||
74ed7ab9 JS |
213 | static void table_instance_destroy(struct table_instance *ti, |
214 | struct table_instance *ufid_ti, | |
215 | bool deferred) | |
e6445719 | 216 | { |
e80857cc AZ |
217 | int i; |
218 | ||
b637e498 | 219 | if (!ti) |
e6445719 PS |
220 | return; |
221 | ||
74ed7ab9 | 222 | BUG_ON(!ufid_ti); |
e80857cc AZ |
223 | if (ti->keep_flows) |
224 | goto skip_flows; | |
225 | ||
226 | for (i = 0; i < ti->n_buckets; i++) { | |
227 | struct sw_flow *flow; | |
ee9c5e67 | 228 | struct hlist_head *head = &ti->buckets[i]; |
e80857cc AZ |
229 | struct hlist_node *n; |
230 | int ver = ti->node_ver; | |
74ed7ab9 | 231 | int ufid_ver = ufid_ti->node_ver; |
e80857cc | 232 | |
74ed7ab9 JS |
233 | hlist_for_each_entry_safe(flow, n, head, flow_table.node[ver]) { |
234 | hlist_del_rcu(&flow->flow_table.node[ver]); | |
235 | if (ovs_identifier_is_ufid(&flow->id)) | |
236 | hlist_del_rcu(&flow->ufid_table.node[ufid_ver]); | |
e80857cc AZ |
237 | ovs_flow_free(flow, deferred); |
238 | } | |
239 | } | |
240 | ||
241 | skip_flows: | |
74ed7ab9 | 242 | if (deferred) { |
b637e498 | 243 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); |
74ed7ab9 JS |
244 | call_rcu(&ufid_ti->rcu, flow_tbl_destroy_rcu_cb); |
245 | } else { | |
b637e498 | 246 | __table_instance_destroy(ti); |
74ed7ab9 JS |
247 | __table_instance_destroy(ufid_ti); |
248 | } | |
b637e498 PS |
249 | } |
250 | ||
9b996e54 PS |
251 | /* No need for locking this function is called from RCU callback or |
252 | * error path. | |
253 | */ | |
254 | void ovs_flow_tbl_destroy(struct flow_table *table) | |
b637e498 | 255 | { |
9b996e54 | 256 | struct table_instance *ti = rcu_dereference_raw(table->ti); |
74ed7ab9 | 257 | struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti); |
b637e498 | 258 | |
74ed7ab9 | 259 | table_instance_destroy(ti, ufid_ti, false); |
e6445719 PS |
260 | } |
261 | ||
b637e498 | 262 | struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti, |
e6445719 PS |
263 | u32 *bucket, u32 *last) |
264 | { | |
265 | struct sw_flow *flow; | |
266 | struct hlist_head *head; | |
267 | int ver; | |
268 | int i; | |
269 | ||
b637e498 PS |
270 | ver = ti->node_ver; |
271 | while (*bucket < ti->n_buckets) { | |
e6445719 | 272 | i = 0; |
ee9c5e67 | 273 | head = &ti->buckets[*bucket]; |
74ed7ab9 | 274 | hlist_for_each_entry_rcu(flow, head, flow_table.node[ver]) { |
e6445719 PS |
275 | if (i < *last) { |
276 | i++; | |
277 | continue; | |
278 | } | |
279 | *last = i + 1; | |
280 | return flow; | |
281 | } | |
282 | (*bucket)++; | |
283 | *last = 0; | |
284 | } | |
285 | ||
286 | return NULL; | |
287 | } | |
288 | ||
b637e498 | 289 | static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash) |
e6445719 | 290 | { |
b637e498 | 291 | hash = jhash_1word(hash, ti->hash_seed); |
ee9c5e67 | 292 | return &ti->buckets[hash & (ti->n_buckets - 1)]; |
e6445719 PS |
293 | } |
294 | ||
74ed7ab9 JS |
295 | static void table_instance_insert(struct table_instance *ti, |
296 | struct sw_flow *flow) | |
e6445719 PS |
297 | { |
298 | struct hlist_head *head; | |
299 | ||
74ed7ab9 JS |
300 | head = find_bucket(ti, flow->flow_table.hash); |
301 | hlist_add_head_rcu(&flow->flow_table.node[ti->node_ver], head); | |
302 | } | |
303 | ||
304 | static void ufid_table_instance_insert(struct table_instance *ti, | |
305 | struct sw_flow *flow) | |
306 | { | |
307 | struct hlist_head *head; | |
308 | ||
309 | head = find_bucket(ti, flow->ufid_table.hash); | |
310 | hlist_add_head_rcu(&flow->ufid_table.node[ti->node_ver], head); | |
e6445719 PS |
311 | } |
312 | ||
b637e498 | 313 | static void flow_table_copy_flows(struct table_instance *old, |
74ed7ab9 | 314 | struct table_instance *new, bool ufid) |
e6445719 PS |
315 | { |
316 | int old_ver; | |
317 | int i; | |
318 | ||
319 | old_ver = old->node_ver; | |
320 | new->node_ver = !old_ver; | |
321 | ||
322 | /* Insert in new table. */ | |
323 | for (i = 0; i < old->n_buckets; i++) { | |
324 | struct sw_flow *flow; | |
ee9c5e67 | 325 | struct hlist_head *head = &old->buckets[i]; |
e6445719 | 326 | |
74ed7ab9 JS |
327 | if (ufid) |
328 | hlist_for_each_entry(flow, head, | |
329 | ufid_table.node[old_ver]) | |
330 | ufid_table_instance_insert(new, flow); | |
331 | else | |
332 | hlist_for_each_entry(flow, head, | |
333 | flow_table.node[old_ver]) | |
334 | table_instance_insert(new, flow); | |
e6445719 PS |
335 | } |
336 | ||
e6445719 PS |
337 | old->keep_flows = true; |
338 | } | |
339 | ||
b637e498 | 340 | static struct table_instance *table_instance_rehash(struct table_instance *ti, |
74ed7ab9 | 341 | int n_buckets, bool ufid) |
e6445719 | 342 | { |
b637e498 | 343 | struct table_instance *new_ti; |
e6445719 | 344 | |
b637e498 PS |
345 | new_ti = table_instance_alloc(n_buckets); |
346 | if (!new_ti) | |
618ed0c8 | 347 | return NULL; |
e6445719 | 348 | |
74ed7ab9 | 349 | flow_table_copy_flows(ti, new_ti, ufid); |
e6445719 | 350 | |
b637e498 | 351 | return new_ti; |
e6445719 PS |
352 | } |
353 | ||
b637e498 | 354 | int ovs_flow_tbl_flush(struct flow_table *flow_table) |
e6445719 | 355 | { |
74ed7ab9 JS |
356 | struct table_instance *old_ti, *new_ti; |
357 | struct table_instance *old_ufid_ti, *new_ufid_ti; | |
e6445719 | 358 | |
b637e498 PS |
359 | new_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
360 | if (!new_ti) | |
361 | return -ENOMEM; | |
74ed7ab9 JS |
362 | new_ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
363 | if (!new_ufid_ti) | |
364 | goto err_free_ti; | |
365 | ||
366 | old_ti = ovsl_dereference(flow_table->ti); | |
367 | old_ufid_ti = ovsl_dereference(flow_table->ufid_ti); | |
b637e498 PS |
368 | |
369 | rcu_assign_pointer(flow_table->ti, new_ti); | |
74ed7ab9 | 370 | rcu_assign_pointer(flow_table->ufid_ti, new_ufid_ti); |
b637e498 PS |
371 | flow_table->last_rehash = jiffies; |
372 | flow_table->count = 0; | |
74ed7ab9 | 373 | flow_table->ufid_count = 0; |
b637e498 | 374 | |
74ed7ab9 | 375 | table_instance_destroy(old_ti, old_ufid_ti, true); |
b637e498 | 376 | return 0; |
74ed7ab9 JS |
377 | |
378 | err_free_ti: | |
379 | __table_instance_destroy(new_ti); | |
380 | return -ENOMEM; | |
e6445719 PS |
381 | } |
382 | ||
272c2cf8 JS |
383 | static u32 flow_hash(const struct sw_flow_key *key, |
384 | const struct sw_flow_key_range *range) | |
e6445719 | 385 | { |
272c2cf8 JS |
386 | int key_start = range->start; |
387 | int key_end = range->end; | |
7085130b | 388 | const u32 *hash_key = (const u32 *)((const u8 *)key + key_start); |
e6445719 PS |
389 | int hash_u32s = (key_end - key_start) >> 2; |
390 | ||
391 | /* Make sure number of hash bytes are multiple of u32. */ | |
392 | BUILD_BUG_ON(sizeof(long) % sizeof(u32)); | |
393 | ||
87545899 | 394 | return jhash2(hash_key, hash_u32s, 0); |
e6445719 PS |
395 | } |
396 | ||
397 | static int flow_key_start(const struct sw_flow_key *key) | |
398 | { | |
00a93bab | 399 | if (key->tun_proto) |
e6445719 PS |
400 | return 0; |
401 | else | |
402 | return rounddown(offsetof(struct sw_flow_key, phy), | |
403 | sizeof(long)); | |
404 | } | |
405 | ||
406 | static bool cmp_key(const struct sw_flow_key *key1, | |
407 | const struct sw_flow_key *key2, | |
408 | int key_start, int key_end) | |
409 | { | |
7085130b DDP |
410 | const long *cp1 = (const long *)((const u8 *)key1 + key_start); |
411 | const long *cp2 = (const long *)((const u8 *)key2 + key_start); | |
e6445719 PS |
412 | long diffs = 0; |
413 | int i; | |
414 | ||
415 | for (i = key_start; i < key_end; i += sizeof(long)) | |
416 | diffs |= *cp1++ ^ *cp2++; | |
417 | ||
418 | return diffs == 0; | |
419 | } | |
420 | ||
421 | static bool flow_cmp_masked_key(const struct sw_flow *flow, | |
422 | const struct sw_flow_key *key, | |
272c2cf8 | 423 | const struct sw_flow_key_range *range) |
e6445719 | 424 | { |
272c2cf8 | 425 | return cmp_key(&flow->key, key, range->start, range->end); |
e6445719 PS |
426 | } |
427 | ||
74ed7ab9 JS |
428 | static bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow, |
429 | const struct sw_flow_match *match) | |
e6445719 PS |
430 | { |
431 | struct sw_flow_key *key = match->key; | |
432 | int key_start = flow_key_start(key); | |
433 | int key_end = match->range.end; | |
434 | ||
74ed7ab9 JS |
435 | BUG_ON(ovs_identifier_is_ufid(&flow->id)); |
436 | return cmp_key(flow->id.unmasked_key, key, key_start, key_end); | |
e6445719 PS |
437 | } |
438 | ||
b637e498 | 439 | static struct sw_flow *masked_flow_lookup(struct table_instance *ti, |
e6445719 | 440 | const struct sw_flow_key *unmasked, |
12eb18f7 | 441 | const struct sw_flow_mask *mask) |
e6445719 PS |
442 | { |
443 | struct sw_flow *flow; | |
444 | struct hlist_head *head; | |
e6445719 PS |
445 | u32 hash; |
446 | struct sw_flow_key masked_key; | |
447 | ||
ae5f2fb1 | 448 | ovs_flow_mask_key(&masked_key, unmasked, false, mask); |
272c2cf8 | 449 | hash = flow_hash(&masked_key, &mask->range); |
b637e498 | 450 | head = find_bucket(ti, hash); |
74ed7ab9 JS |
451 | hlist_for_each_entry_rcu(flow, head, flow_table.node[ti->node_ver]) { |
452 | if (flow->mask == mask && flow->flow_table.hash == hash && | |
272c2cf8 | 453 | flow_cmp_masked_key(flow, &masked_key, &mask->range)) |
e6445719 PS |
454 | return flow; |
455 | } | |
456 | return NULL; | |
457 | } | |
458 | ||
5bb50632 | 459 | struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl, |
1bd7116f AZ |
460 | const struct sw_flow_key *key, |
461 | u32 *n_mask_hit) | |
e6445719 | 462 | { |
663efa36 | 463 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ti); |
e6445719 | 464 | struct sw_flow_mask *mask; |
b637e498 | 465 | struct sw_flow *flow; |
e6445719 | 466 | |
1bd7116f | 467 | *n_mask_hit = 0; |
b637e498 | 468 | list_for_each_entry_rcu(mask, &tbl->mask_list, list) { |
1bd7116f | 469 | (*n_mask_hit)++; |
b637e498 | 470 | flow = masked_flow_lookup(ti, key, mask); |
e6445719 | 471 | if (flow) /* Found */ |
b637e498 | 472 | return flow; |
e6445719 | 473 | } |
b637e498 PS |
474 | return NULL; |
475 | } | |
e6445719 | 476 | |
5bb50632 AZ |
477 | struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl, |
478 | const struct sw_flow_key *key) | |
479 | { | |
480 | u32 __always_unused n_mask_hit; | |
481 | ||
482 | return ovs_flow_tbl_lookup_stats(tbl, key, &n_mask_hit); | |
483 | } | |
484 | ||
4a46b24e | 485 | struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl, |
12eb18f7 | 486 | const struct sw_flow_match *match) |
4a46b24e AW |
487 | { |
488 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ti); | |
489 | struct sw_flow_mask *mask; | |
490 | struct sw_flow *flow; | |
491 | ||
492 | /* Always called under ovs-mutex. */ | |
493 | list_for_each_entry(mask, &tbl->mask_list, list) { | |
494 | flow = masked_flow_lookup(ti, match->key, mask); | |
74ed7ab9 JS |
495 | if (flow && ovs_identifier_is_key(&flow->id) && |
496 | ovs_flow_cmp_unmasked_key(flow, match)) | |
497 | return flow; | |
498 | } | |
499 | return NULL; | |
500 | } | |
501 | ||
502 | static u32 ufid_hash(const struct sw_flow_id *sfid) | |
503 | { | |
504 | return jhash(sfid->ufid, sfid->ufid_len, 0); | |
505 | } | |
506 | ||
507 | static bool ovs_flow_cmp_ufid(const struct sw_flow *flow, | |
508 | const struct sw_flow_id *sfid) | |
509 | { | |
510 | if (flow->id.ufid_len != sfid->ufid_len) | |
511 | return false; | |
512 | ||
513 | return !memcmp(flow->id.ufid, sfid->ufid, sfid->ufid_len); | |
514 | } | |
515 | ||
516 | bool ovs_flow_cmp(const struct sw_flow *flow, const struct sw_flow_match *match) | |
517 | { | |
518 | if (ovs_identifier_is_ufid(&flow->id)) | |
519 | return flow_cmp_masked_key(flow, match->key, &match->range); | |
520 | ||
521 | return ovs_flow_cmp_unmasked_key(flow, match); | |
522 | } | |
523 | ||
524 | struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *tbl, | |
525 | const struct sw_flow_id *ufid) | |
526 | { | |
527 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ufid_ti); | |
528 | struct sw_flow *flow; | |
529 | struct hlist_head *head; | |
530 | u32 hash; | |
531 | ||
532 | hash = ufid_hash(ufid); | |
533 | head = find_bucket(ti, hash); | |
534 | hlist_for_each_entry_rcu(flow, head, ufid_table.node[ti->node_ver]) { | |
535 | if (flow->ufid_table.hash == hash && | |
536 | ovs_flow_cmp_ufid(flow, ufid)) | |
4a46b24e AW |
537 | return flow; |
538 | } | |
539 | return NULL; | |
540 | } | |
541 | ||
1bd7116f AZ |
542 | int ovs_flow_tbl_num_masks(const struct flow_table *table) |
543 | { | |
544 | struct sw_flow_mask *mask; | |
545 | int num = 0; | |
546 | ||
547 | list_for_each_entry(mask, &table->mask_list, list) | |
548 | num++; | |
549 | ||
550 | return num; | |
551 | } | |
552 | ||
74ed7ab9 JS |
553 | static struct table_instance *table_instance_expand(struct table_instance *ti, |
554 | bool ufid) | |
b637e498 | 555 | { |
74ed7ab9 | 556 | return table_instance_rehash(ti, ti->n_buckets * 2, ufid); |
e6445719 PS |
557 | } |
558 | ||
56c19868 JR |
559 | /* Remove 'mask' from the mask list, if it is not needed any more. */ |
560 | static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask) | |
561 | { | |
562 | if (mask) { | |
563 | /* ovs-lock is required to protect mask-refcount and | |
564 | * mask list. | |
565 | */ | |
566 | ASSERT_OVSL(); | |
567 | BUG_ON(!mask->ref_count); | |
568 | mask->ref_count--; | |
569 | ||
570 | if (!mask->ref_count) { | |
571 | list_del_rcu(&mask->list); | |
572 | kfree_rcu(mask, rcu); | |
573 | } | |
574 | } | |
575 | } | |
576 | ||
577 | /* Must be called with OVS mutex held. */ | |
e6445719 PS |
578 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow) |
579 | { | |
b637e498 | 580 | struct table_instance *ti = ovsl_dereference(table->ti); |
74ed7ab9 | 581 | struct table_instance *ufid_ti = ovsl_dereference(table->ufid_ti); |
b637e498 | 582 | |
e6445719 | 583 | BUG_ON(table->count == 0); |
74ed7ab9 | 584 | hlist_del_rcu(&flow->flow_table.node[ti->node_ver]); |
e6445719 | 585 | table->count--; |
74ed7ab9 JS |
586 | if (ovs_identifier_is_ufid(&flow->id)) { |
587 | hlist_del_rcu(&flow->ufid_table.node[ufid_ti->node_ver]); | |
588 | table->ufid_count--; | |
589 | } | |
56c19868 JR |
590 | |
591 | /* RCU delete the mask. 'flow->mask' is not NULLed, as it should be | |
592 | * accessible as long as the RCU read lock is held. | |
593 | */ | |
594 | flow_mask_remove(table, flow->mask); | |
e6445719 PS |
595 | } |
596 | ||
618ed0c8 | 597 | static struct sw_flow_mask *mask_alloc(void) |
e6445719 PS |
598 | { |
599 | struct sw_flow_mask *mask; | |
600 | ||
601 | mask = kmalloc(sizeof(*mask), GFP_KERNEL); | |
602 | if (mask) | |
e80857cc | 603 | mask->ref_count = 1; |
e6445719 PS |
604 | |
605 | return mask; | |
606 | } | |
607 | ||
e6445719 PS |
608 | static bool mask_equal(const struct sw_flow_mask *a, |
609 | const struct sw_flow_mask *b) | |
610 | { | |
7085130b DDP |
611 | const u8 *a_ = (const u8 *)&a->key + a->range.start; |
612 | const u8 *b_ = (const u8 *)&b->key + b->range.start; | |
e6445719 PS |
613 | |
614 | return (a->range.end == b->range.end) | |
615 | && (a->range.start == b->range.start) | |
616 | && (memcmp(a_, b_, range_n_bytes(&a->range)) == 0); | |
617 | } | |
618 | ||
618ed0c8 | 619 | static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl, |
e6445719 PS |
620 | const struct sw_flow_mask *mask) |
621 | { | |
622 | struct list_head *ml; | |
623 | ||
b637e498 | 624 | list_for_each(ml, &tbl->mask_list) { |
e6445719 PS |
625 | struct sw_flow_mask *m; |
626 | m = container_of(ml, struct sw_flow_mask, list); | |
627 | if (mask_equal(mask, m)) | |
628 | return m; | |
629 | } | |
630 | ||
631 | return NULL; | |
632 | } | |
633 | ||
d1211908 | 634 | /* Add 'mask' into the mask list, if it is not already there. */ |
618ed0c8 | 635 | static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow, |
12eb18f7 | 636 | const struct sw_flow_mask *new) |
618ed0c8 PS |
637 | { |
638 | struct sw_flow_mask *mask; | |
639 | mask = flow_mask_find(tbl, new); | |
640 | if (!mask) { | |
641 | /* Allocate a new mask if none exsits. */ | |
642 | mask = mask_alloc(); | |
643 | if (!mask) | |
644 | return -ENOMEM; | |
645 | mask->key = new->key; | |
646 | mask->range = new->range; | |
647 | list_add_rcu(&mask->list, &tbl->mask_list); | |
e80857cc AZ |
648 | } else { |
649 | BUG_ON(!mask->ref_count); | |
650 | mask->ref_count++; | |
618ed0c8 PS |
651 | } |
652 | ||
618ed0c8 PS |
653 | flow->mask = mask; |
654 | return 0; | |
655 | } | |
656 | ||
56c19868 | 657 | /* Must be called with OVS mutex held. */ |
d29ab6f8 | 658 | static void flow_key_insert(struct flow_table *table, struct sw_flow *flow) |
e6445719 | 659 | { |
618ed0c8 PS |
660 | struct table_instance *new_ti = NULL; |
661 | struct table_instance *ti; | |
618ed0c8 | 662 | |
74ed7ab9 | 663 | flow->flow_table.hash = flow_hash(&flow->key, &flow->mask->range); |
618ed0c8 PS |
664 | ti = ovsl_dereference(table->ti); |
665 | table_instance_insert(ti, flow); | |
666 | table->count++; | |
667 | ||
668 | /* Expand table, if necessary, to make room. */ | |
669 | if (table->count > ti->n_buckets) | |
74ed7ab9 | 670 | new_ti = table_instance_expand(ti, false); |
618ed0c8 | 671 | else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL)) |
74ed7ab9 | 672 | new_ti = table_instance_rehash(ti, ti->n_buckets, false); |
618ed0c8 PS |
673 | |
674 | if (new_ti) { | |
675 | rcu_assign_pointer(table->ti, new_ti); | |
74ed7ab9 | 676 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); |
618ed0c8 PS |
677 | table->last_rehash = jiffies; |
678 | } | |
d29ab6f8 JS |
679 | } |
680 | ||
74ed7ab9 JS |
681 | /* Must be called with OVS mutex held. */ |
682 | static void flow_ufid_insert(struct flow_table *table, struct sw_flow *flow) | |
683 | { | |
684 | struct table_instance *ti; | |
685 | ||
686 | flow->ufid_table.hash = ufid_hash(&flow->id); | |
687 | ti = ovsl_dereference(table->ufid_ti); | |
688 | ufid_table_instance_insert(ti, flow); | |
689 | table->ufid_count++; | |
690 | ||
691 | /* Expand table, if necessary, to make room. */ | |
692 | if (table->ufid_count > ti->n_buckets) { | |
693 | struct table_instance *new_ti; | |
694 | ||
695 | new_ti = table_instance_expand(ti, true); | |
696 | if (new_ti) { | |
697 | rcu_assign_pointer(table->ufid_ti, new_ti); | |
698 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); | |
699 | } | |
700 | } | |
701 | } | |
702 | ||
d29ab6f8 JS |
703 | /* Must be called with OVS mutex held. */ |
704 | int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow, | |
705 | const struct sw_flow_mask *mask) | |
706 | { | |
707 | int err; | |
708 | ||
709 | err = flow_mask_insert(table, flow, mask); | |
710 | if (err) | |
711 | return err; | |
712 | flow_key_insert(table, flow); | |
74ed7ab9 JS |
713 | if (ovs_identifier_is_ufid(&flow->id)) |
714 | flow_ufid_insert(table, flow); | |
d29ab6f8 | 715 | |
618ed0c8 | 716 | return 0; |
e6445719 PS |
717 | } |
718 | ||
719 | /* Initializes the flow module. | |
720 | * Returns zero if successful or a negative error code. */ | |
721 | int ovs_flow_init(void) | |
722 | { | |
723 | BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long)); | |
724 | BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long)); | |
725 | ||
63e7959c | 726 | flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow) |
db74a333 | 727 | + (nr_cpu_ids |
63e7959c JR |
728 | * sizeof(struct flow_stats *)), |
729 | 0, 0, NULL); | |
e6445719 PS |
730 | if (flow_cache == NULL) |
731 | return -ENOMEM; | |
732 | ||
63e7959c JR |
733 | flow_stats_cache |
734 | = kmem_cache_create("sw_flow_stats", sizeof(struct flow_stats), | |
735 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
736 | if (flow_stats_cache == NULL) { | |
737 | kmem_cache_destroy(flow_cache); | |
738 | flow_cache = NULL; | |
739 | return -ENOMEM; | |
740 | } | |
741 | ||
e6445719 PS |
742 | return 0; |
743 | } | |
744 | ||
745 | /* Uninitializes the flow module. */ | |
746 | void ovs_flow_exit(void) | |
747 | { | |
63e7959c | 748 | kmem_cache_destroy(flow_stats_cache); |
e6445719 PS |
749 | kmem_cache_destroy(flow_cache); |
750 | } |