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> | |
35 | #include <linux/if_arp.h> | |
36 | #include <linux/ip.h> | |
37 | #include <linux/ipv6.h> | |
38 | #include <linux/sctp.h> | |
39 | #include <linux/tcp.h> | |
40 | #include <linux/udp.h> | |
41 | #include <linux/icmp.h> | |
42 | #include <linux/icmpv6.h> | |
43 | #include <linux/rculist.h> | |
44 | #include <net/ip.h> | |
45 | #include <net/ipv6.h> | |
46 | #include <net/ndisc.h> | |
47 | ||
b637e498 PS |
48 | #define TBL_MIN_BUCKETS 1024 |
49 | #define REHASH_INTERVAL (10 * 60 * HZ) | |
50 | ||
e6445719 | 51 | static struct kmem_cache *flow_cache; |
63e7959c | 52 | struct kmem_cache *flow_stats_cache __read_mostly; |
e6445719 PS |
53 | |
54 | static u16 range_n_bytes(const struct sw_flow_key_range *range) | |
55 | { | |
56 | return range->end - range->start; | |
57 | } | |
58 | ||
59 | void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src, | |
ae5f2fb1 | 60 | bool full, const struct sw_flow_mask *mask) |
e6445719 | 61 | { |
ae5f2fb1 JG |
62 | int start = full ? 0 : mask->range.start; |
63 | int len = full ? sizeof *dst : range_n_bytes(&mask->range); | |
64 | const long *m = (const long *)((const u8 *)&mask->key + start); | |
65 | const long *s = (const long *)((const u8 *)src + start); | |
66 | long *d = (long *)((u8 *)dst + start); | |
e6445719 PS |
67 | int i; |
68 | ||
ae5f2fb1 JG |
69 | /* If 'full' is true then all of 'dst' is fully initialized. Otherwise, |
70 | * if 'full' is false the memory outside of the 'mask->range' is left | |
71 | * uninitialized. This can be used as an optimization when further | |
72 | * operations on 'dst' only use contents within 'mask->range'. | |
e6445719 | 73 | */ |
ae5f2fb1 | 74 | for (i = 0; i < len; i += sizeof(long)) |
e6445719 PS |
75 | *d++ = *s++ & *m++; |
76 | } | |
77 | ||
23dabf88 | 78 | struct sw_flow *ovs_flow_alloc(void) |
e6445719 PS |
79 | { |
80 | struct sw_flow *flow; | |
63e7959c JR |
81 | struct flow_stats *stats; |
82 | int node; | |
e6445719 PS |
83 | |
84 | flow = kmem_cache_alloc(flow_cache, GFP_KERNEL); | |
85 | if (!flow) | |
86 | return ERR_PTR(-ENOMEM); | |
87 | ||
e6445719 PS |
88 | flow->sf_acts = NULL; |
89 | flow->mask = NULL; | |
ca539345 PS |
90 | flow->id.unmasked_key = NULL; |
91 | flow->id.ufid_len = 0; | |
63e7959c | 92 | flow->stats_last_writer = NUMA_NO_NODE; |
e6445719 | 93 | |
63e7959c JR |
94 | /* Initialize the default stat node. */ |
95 | stats = kmem_cache_alloc_node(flow_stats_cache, | |
96 | GFP_KERNEL | __GFP_ZERO, 0); | |
97 | if (!stats) | |
23dabf88 | 98 | goto err; |
e298e505 | 99 | |
63e7959c JR |
100 | spin_lock_init(&stats->lock); |
101 | ||
102 | RCU_INIT_POINTER(flow->stats[0], stats); | |
103 | ||
104 | for_each_node(node) | |
105 | if (node != 0) | |
106 | RCU_INIT_POINTER(flow->stats[node], NULL); | |
e298e505 | 107 | |
e6445719 | 108 | return flow; |
e298e505 | 109 | err: |
ece37c87 | 110 | kmem_cache_free(flow_cache, flow); |
e298e505 | 111 | return ERR_PTR(-ENOMEM); |
e6445719 PS |
112 | } |
113 | ||
12eb18f7 | 114 | int ovs_flow_tbl_count(const struct flow_table *table) |
b637e498 PS |
115 | { |
116 | return table->count; | |
117 | } | |
118 | ||
e6445719 PS |
119 | static struct flex_array *alloc_buckets(unsigned int n_buckets) |
120 | { | |
121 | struct flex_array *buckets; | |
122 | int i, err; | |
123 | ||
124 | buckets = flex_array_alloc(sizeof(struct hlist_head), | |
125 | n_buckets, GFP_KERNEL); | |
126 | if (!buckets) | |
127 | return NULL; | |
128 | ||
129 | err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL); | |
130 | if (err) { | |
131 | flex_array_free(buckets); | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | for (i = 0; i < n_buckets; i++) | |
136 | INIT_HLIST_HEAD((struct hlist_head *) | |
137 | flex_array_get(buckets, i)); | |
138 | ||
139 | return buckets; | |
140 | } | |
141 | ||
142 | static void flow_free(struct sw_flow *flow) | |
143 | { | |
63e7959c JR |
144 | int node; |
145 | ||
74ed7ab9 JS |
146 | if (ovs_identifier_is_key(&flow->id)) |
147 | kfree(flow->id.unmasked_key); | |
34ae932a TG |
148 | if (flow->sf_acts) |
149 | ovs_nla_free_flow_actions((struct sw_flow_actions __force *)flow->sf_acts); | |
63e7959c JR |
150 | for_each_node(node) |
151 | if (flow->stats[node]) | |
152 | kmem_cache_free(flow_stats_cache, | |
153 | (struct flow_stats __force *)flow->stats[node]); | |
e6445719 PS |
154 | kmem_cache_free(flow_cache, flow); |
155 | } | |
156 | ||
157 | static void rcu_free_flow_callback(struct rcu_head *rcu) | |
158 | { | |
159 | struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); | |
160 | ||
161 | flow_free(flow); | |
162 | } | |
163 | ||
e80857cc | 164 | void ovs_flow_free(struct sw_flow *flow, bool deferred) |
618ed0c8 | 165 | { |
e80857cc | 166 | if (!flow) |
618ed0c8 PS |
167 | return; |
168 | ||
e6445719 PS |
169 | if (deferred) |
170 | call_rcu(&flow->rcu, rcu_free_flow_callback); | |
171 | else | |
172 | flow_free(flow); | |
173 | } | |
174 | ||
175 | static void free_buckets(struct flex_array *buckets) | |
176 | { | |
177 | flex_array_free(buckets); | |
178 | } | |
179 | ||
e80857cc | 180 | |
b637e498 | 181 | static void __table_instance_destroy(struct table_instance *ti) |
e6445719 | 182 | { |
b637e498 PS |
183 | free_buckets(ti->buckets); |
184 | kfree(ti); | |
e6445719 PS |
185 | } |
186 | ||
b637e498 | 187 | static struct table_instance *table_instance_alloc(int new_size) |
e6445719 | 188 | { |
b637e498 | 189 | struct table_instance *ti = kmalloc(sizeof(*ti), GFP_KERNEL); |
e6445719 | 190 | |
b637e498 | 191 | if (!ti) |
e6445719 PS |
192 | return NULL; |
193 | ||
b637e498 | 194 | ti->buckets = alloc_buckets(new_size); |
e6445719 | 195 | |
b637e498 PS |
196 | if (!ti->buckets) { |
197 | kfree(ti); | |
e6445719 PS |
198 | return NULL; |
199 | } | |
b637e498 PS |
200 | ti->n_buckets = new_size; |
201 | ti->node_ver = 0; | |
202 | ti->keep_flows = false; | |
203 | get_random_bytes(&ti->hash_seed, sizeof(u32)); | |
e6445719 | 204 | |
b637e498 | 205 | return ti; |
e6445719 PS |
206 | } |
207 | ||
b637e498 | 208 | int ovs_flow_tbl_init(struct flow_table *table) |
e6445719 | 209 | { |
74ed7ab9 | 210 | struct table_instance *ti, *ufid_ti; |
e6445719 | 211 | |
b637e498 | 212 | ti = table_instance_alloc(TBL_MIN_BUCKETS); |
e6445719 | 213 | |
b637e498 PS |
214 | if (!ti) |
215 | return -ENOMEM; | |
e6445719 | 216 | |
74ed7ab9 JS |
217 | ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
218 | if (!ufid_ti) | |
219 | goto free_ti; | |
220 | ||
b637e498 | 221 | rcu_assign_pointer(table->ti, ti); |
74ed7ab9 | 222 | rcu_assign_pointer(table->ufid_ti, ufid_ti); |
b637e498 PS |
223 | INIT_LIST_HEAD(&table->mask_list); |
224 | table->last_rehash = jiffies; | |
225 | table->count = 0; | |
74ed7ab9 | 226 | table->ufid_count = 0; |
b637e498 | 227 | return 0; |
74ed7ab9 JS |
228 | |
229 | free_ti: | |
230 | __table_instance_destroy(ti); | |
231 | return -ENOMEM; | |
e6445719 PS |
232 | } |
233 | ||
234 | static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) | |
235 | { | |
b637e498 | 236 | struct table_instance *ti = container_of(rcu, struct table_instance, rcu); |
e6445719 | 237 | |
b637e498 | 238 | __table_instance_destroy(ti); |
e6445719 PS |
239 | } |
240 | ||
74ed7ab9 JS |
241 | static void table_instance_destroy(struct table_instance *ti, |
242 | struct table_instance *ufid_ti, | |
243 | bool deferred) | |
e6445719 | 244 | { |
e80857cc AZ |
245 | int i; |
246 | ||
b637e498 | 247 | if (!ti) |
e6445719 PS |
248 | return; |
249 | ||
74ed7ab9 | 250 | BUG_ON(!ufid_ti); |
e80857cc AZ |
251 | if (ti->keep_flows) |
252 | goto skip_flows; | |
253 | ||
254 | for (i = 0; i < ti->n_buckets; i++) { | |
255 | struct sw_flow *flow; | |
256 | struct hlist_head *head = flex_array_get(ti->buckets, i); | |
257 | struct hlist_node *n; | |
258 | int ver = ti->node_ver; | |
74ed7ab9 | 259 | int ufid_ver = ufid_ti->node_ver; |
e80857cc | 260 | |
74ed7ab9 JS |
261 | hlist_for_each_entry_safe(flow, n, head, flow_table.node[ver]) { |
262 | hlist_del_rcu(&flow->flow_table.node[ver]); | |
263 | if (ovs_identifier_is_ufid(&flow->id)) | |
264 | hlist_del_rcu(&flow->ufid_table.node[ufid_ver]); | |
e80857cc AZ |
265 | ovs_flow_free(flow, deferred); |
266 | } | |
267 | } | |
268 | ||
269 | skip_flows: | |
74ed7ab9 | 270 | if (deferred) { |
b637e498 | 271 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); |
74ed7ab9 JS |
272 | call_rcu(&ufid_ti->rcu, flow_tbl_destroy_rcu_cb); |
273 | } else { | |
b637e498 | 274 | __table_instance_destroy(ti); |
74ed7ab9 JS |
275 | __table_instance_destroy(ufid_ti); |
276 | } | |
b637e498 PS |
277 | } |
278 | ||
9b996e54 PS |
279 | /* No need for locking this function is called from RCU callback or |
280 | * error path. | |
281 | */ | |
282 | void ovs_flow_tbl_destroy(struct flow_table *table) | |
b637e498 | 283 | { |
9b996e54 | 284 | struct table_instance *ti = rcu_dereference_raw(table->ti); |
74ed7ab9 | 285 | struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti); |
b637e498 | 286 | |
74ed7ab9 | 287 | table_instance_destroy(ti, ufid_ti, false); |
e6445719 PS |
288 | } |
289 | ||
b637e498 | 290 | struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti, |
e6445719 PS |
291 | u32 *bucket, u32 *last) |
292 | { | |
293 | struct sw_flow *flow; | |
294 | struct hlist_head *head; | |
295 | int ver; | |
296 | int i; | |
297 | ||
b637e498 PS |
298 | ver = ti->node_ver; |
299 | while (*bucket < ti->n_buckets) { | |
e6445719 | 300 | i = 0; |
b637e498 | 301 | head = flex_array_get(ti->buckets, *bucket); |
74ed7ab9 | 302 | hlist_for_each_entry_rcu(flow, head, flow_table.node[ver]) { |
e6445719 PS |
303 | if (i < *last) { |
304 | i++; | |
305 | continue; | |
306 | } | |
307 | *last = i + 1; | |
308 | return flow; | |
309 | } | |
310 | (*bucket)++; | |
311 | *last = 0; | |
312 | } | |
313 | ||
314 | return NULL; | |
315 | } | |
316 | ||
b637e498 | 317 | static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash) |
e6445719 | 318 | { |
b637e498 PS |
319 | hash = jhash_1word(hash, ti->hash_seed); |
320 | return flex_array_get(ti->buckets, | |
321 | (hash & (ti->n_buckets - 1))); | |
e6445719 PS |
322 | } |
323 | ||
74ed7ab9 JS |
324 | static void table_instance_insert(struct table_instance *ti, |
325 | struct sw_flow *flow) | |
e6445719 PS |
326 | { |
327 | struct hlist_head *head; | |
328 | ||
74ed7ab9 JS |
329 | head = find_bucket(ti, flow->flow_table.hash); |
330 | hlist_add_head_rcu(&flow->flow_table.node[ti->node_ver], head); | |
331 | } | |
332 | ||
333 | static void ufid_table_instance_insert(struct table_instance *ti, | |
334 | struct sw_flow *flow) | |
335 | { | |
336 | struct hlist_head *head; | |
337 | ||
338 | head = find_bucket(ti, flow->ufid_table.hash); | |
339 | hlist_add_head_rcu(&flow->ufid_table.node[ti->node_ver], head); | |
e6445719 PS |
340 | } |
341 | ||
b637e498 | 342 | static void flow_table_copy_flows(struct table_instance *old, |
74ed7ab9 | 343 | struct table_instance *new, bool ufid) |
e6445719 PS |
344 | { |
345 | int old_ver; | |
346 | int i; | |
347 | ||
348 | old_ver = old->node_ver; | |
349 | new->node_ver = !old_ver; | |
350 | ||
351 | /* Insert in new table. */ | |
352 | for (i = 0; i < old->n_buckets; i++) { | |
353 | struct sw_flow *flow; | |
354 | struct hlist_head *head; | |
355 | ||
356 | head = flex_array_get(old->buckets, i); | |
357 | ||
74ed7ab9 JS |
358 | if (ufid) |
359 | hlist_for_each_entry(flow, head, | |
360 | ufid_table.node[old_ver]) | |
361 | ufid_table_instance_insert(new, flow); | |
362 | else | |
363 | hlist_for_each_entry(flow, head, | |
364 | flow_table.node[old_ver]) | |
365 | table_instance_insert(new, flow); | |
e6445719 PS |
366 | } |
367 | ||
e6445719 PS |
368 | old->keep_flows = true; |
369 | } | |
370 | ||
b637e498 | 371 | static struct table_instance *table_instance_rehash(struct table_instance *ti, |
74ed7ab9 | 372 | int n_buckets, bool ufid) |
e6445719 | 373 | { |
b637e498 | 374 | struct table_instance *new_ti; |
e6445719 | 375 | |
b637e498 PS |
376 | new_ti = table_instance_alloc(n_buckets); |
377 | if (!new_ti) | |
618ed0c8 | 378 | return NULL; |
e6445719 | 379 | |
74ed7ab9 | 380 | flow_table_copy_flows(ti, new_ti, ufid); |
e6445719 | 381 | |
b637e498 | 382 | return new_ti; |
e6445719 PS |
383 | } |
384 | ||
b637e498 | 385 | int ovs_flow_tbl_flush(struct flow_table *flow_table) |
e6445719 | 386 | { |
74ed7ab9 JS |
387 | struct table_instance *old_ti, *new_ti; |
388 | struct table_instance *old_ufid_ti, *new_ufid_ti; | |
e6445719 | 389 | |
b637e498 PS |
390 | new_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
391 | if (!new_ti) | |
392 | return -ENOMEM; | |
74ed7ab9 JS |
393 | new_ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
394 | if (!new_ufid_ti) | |
395 | goto err_free_ti; | |
396 | ||
397 | old_ti = ovsl_dereference(flow_table->ti); | |
398 | old_ufid_ti = ovsl_dereference(flow_table->ufid_ti); | |
b637e498 PS |
399 | |
400 | rcu_assign_pointer(flow_table->ti, new_ti); | |
74ed7ab9 | 401 | rcu_assign_pointer(flow_table->ufid_ti, new_ufid_ti); |
b637e498 PS |
402 | flow_table->last_rehash = jiffies; |
403 | flow_table->count = 0; | |
74ed7ab9 | 404 | flow_table->ufid_count = 0; |
b637e498 | 405 | |
74ed7ab9 | 406 | table_instance_destroy(old_ti, old_ufid_ti, true); |
b637e498 | 407 | return 0; |
74ed7ab9 JS |
408 | |
409 | err_free_ti: | |
410 | __table_instance_destroy(new_ti); | |
411 | return -ENOMEM; | |
e6445719 PS |
412 | } |
413 | ||
272c2cf8 JS |
414 | static u32 flow_hash(const struct sw_flow_key *key, |
415 | const struct sw_flow_key_range *range) | |
e6445719 | 416 | { |
272c2cf8 JS |
417 | int key_start = range->start; |
418 | int key_end = range->end; | |
7085130b | 419 | const u32 *hash_key = (const u32 *)((const u8 *)key + key_start); |
e6445719 PS |
420 | int hash_u32s = (key_end - key_start) >> 2; |
421 | ||
422 | /* Make sure number of hash bytes are multiple of u32. */ | |
423 | BUILD_BUG_ON(sizeof(long) % sizeof(u32)); | |
424 | ||
87545899 | 425 | return jhash2(hash_key, hash_u32s, 0); |
e6445719 PS |
426 | } |
427 | ||
428 | static int flow_key_start(const struct sw_flow_key *key) | |
429 | { | |
c1ea5d67 | 430 | if (key->tun_key.u.ipv4.dst) |
e6445719 PS |
431 | return 0; |
432 | else | |
433 | return rounddown(offsetof(struct sw_flow_key, phy), | |
434 | sizeof(long)); | |
435 | } | |
436 | ||
437 | static bool cmp_key(const struct sw_flow_key *key1, | |
438 | const struct sw_flow_key *key2, | |
439 | int key_start, int key_end) | |
440 | { | |
7085130b DDP |
441 | const long *cp1 = (const long *)((const u8 *)key1 + key_start); |
442 | const long *cp2 = (const long *)((const u8 *)key2 + key_start); | |
e6445719 PS |
443 | long diffs = 0; |
444 | int i; | |
445 | ||
446 | for (i = key_start; i < key_end; i += sizeof(long)) | |
447 | diffs |= *cp1++ ^ *cp2++; | |
448 | ||
449 | return diffs == 0; | |
450 | } | |
451 | ||
452 | static bool flow_cmp_masked_key(const struct sw_flow *flow, | |
453 | const struct sw_flow_key *key, | |
272c2cf8 | 454 | const struct sw_flow_key_range *range) |
e6445719 | 455 | { |
272c2cf8 | 456 | return cmp_key(&flow->key, key, range->start, range->end); |
e6445719 PS |
457 | } |
458 | ||
74ed7ab9 JS |
459 | static bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow, |
460 | const struct sw_flow_match *match) | |
e6445719 PS |
461 | { |
462 | struct sw_flow_key *key = match->key; | |
463 | int key_start = flow_key_start(key); | |
464 | int key_end = match->range.end; | |
465 | ||
74ed7ab9 JS |
466 | BUG_ON(ovs_identifier_is_ufid(&flow->id)); |
467 | return cmp_key(flow->id.unmasked_key, key, key_start, key_end); | |
e6445719 PS |
468 | } |
469 | ||
b637e498 | 470 | static struct sw_flow *masked_flow_lookup(struct table_instance *ti, |
e6445719 | 471 | const struct sw_flow_key *unmasked, |
12eb18f7 | 472 | const struct sw_flow_mask *mask) |
e6445719 PS |
473 | { |
474 | struct sw_flow *flow; | |
475 | struct hlist_head *head; | |
e6445719 PS |
476 | u32 hash; |
477 | struct sw_flow_key masked_key; | |
478 | ||
ae5f2fb1 | 479 | ovs_flow_mask_key(&masked_key, unmasked, false, mask); |
272c2cf8 | 480 | hash = flow_hash(&masked_key, &mask->range); |
b637e498 | 481 | head = find_bucket(ti, hash); |
74ed7ab9 JS |
482 | hlist_for_each_entry_rcu(flow, head, flow_table.node[ti->node_ver]) { |
483 | if (flow->mask == mask && flow->flow_table.hash == hash && | |
272c2cf8 | 484 | flow_cmp_masked_key(flow, &masked_key, &mask->range)) |
e6445719 PS |
485 | return flow; |
486 | } | |
487 | return NULL; | |
488 | } | |
489 | ||
5bb50632 | 490 | struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl, |
1bd7116f AZ |
491 | const struct sw_flow_key *key, |
492 | u32 *n_mask_hit) | |
e6445719 | 493 | { |
663efa36 | 494 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ti); |
e6445719 | 495 | struct sw_flow_mask *mask; |
b637e498 | 496 | struct sw_flow *flow; |
e6445719 | 497 | |
1bd7116f | 498 | *n_mask_hit = 0; |
b637e498 | 499 | list_for_each_entry_rcu(mask, &tbl->mask_list, list) { |
1bd7116f | 500 | (*n_mask_hit)++; |
b637e498 | 501 | flow = masked_flow_lookup(ti, key, mask); |
e6445719 | 502 | if (flow) /* Found */ |
b637e498 | 503 | return flow; |
e6445719 | 504 | } |
b637e498 PS |
505 | return NULL; |
506 | } | |
e6445719 | 507 | |
5bb50632 AZ |
508 | struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl, |
509 | const struct sw_flow_key *key) | |
510 | { | |
511 | u32 __always_unused n_mask_hit; | |
512 | ||
513 | return ovs_flow_tbl_lookup_stats(tbl, key, &n_mask_hit); | |
514 | } | |
515 | ||
4a46b24e | 516 | struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl, |
12eb18f7 | 517 | const struct sw_flow_match *match) |
4a46b24e AW |
518 | { |
519 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ti); | |
520 | struct sw_flow_mask *mask; | |
521 | struct sw_flow *flow; | |
522 | ||
523 | /* Always called under ovs-mutex. */ | |
524 | list_for_each_entry(mask, &tbl->mask_list, list) { | |
525 | flow = masked_flow_lookup(ti, match->key, mask); | |
74ed7ab9 JS |
526 | if (flow && ovs_identifier_is_key(&flow->id) && |
527 | ovs_flow_cmp_unmasked_key(flow, match)) | |
528 | return flow; | |
529 | } | |
530 | return NULL; | |
531 | } | |
532 | ||
533 | static u32 ufid_hash(const struct sw_flow_id *sfid) | |
534 | { | |
535 | return jhash(sfid->ufid, sfid->ufid_len, 0); | |
536 | } | |
537 | ||
538 | static bool ovs_flow_cmp_ufid(const struct sw_flow *flow, | |
539 | const struct sw_flow_id *sfid) | |
540 | { | |
541 | if (flow->id.ufid_len != sfid->ufid_len) | |
542 | return false; | |
543 | ||
544 | return !memcmp(flow->id.ufid, sfid->ufid, sfid->ufid_len); | |
545 | } | |
546 | ||
547 | bool ovs_flow_cmp(const struct sw_flow *flow, const struct sw_flow_match *match) | |
548 | { | |
549 | if (ovs_identifier_is_ufid(&flow->id)) | |
550 | return flow_cmp_masked_key(flow, match->key, &match->range); | |
551 | ||
552 | return ovs_flow_cmp_unmasked_key(flow, match); | |
553 | } | |
554 | ||
555 | struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *tbl, | |
556 | const struct sw_flow_id *ufid) | |
557 | { | |
558 | struct table_instance *ti = rcu_dereference_ovsl(tbl->ufid_ti); | |
559 | struct sw_flow *flow; | |
560 | struct hlist_head *head; | |
561 | u32 hash; | |
562 | ||
563 | hash = ufid_hash(ufid); | |
564 | head = find_bucket(ti, hash); | |
565 | hlist_for_each_entry_rcu(flow, head, ufid_table.node[ti->node_ver]) { | |
566 | if (flow->ufid_table.hash == hash && | |
567 | ovs_flow_cmp_ufid(flow, ufid)) | |
4a46b24e AW |
568 | return flow; |
569 | } | |
570 | return NULL; | |
571 | } | |
572 | ||
1bd7116f AZ |
573 | int ovs_flow_tbl_num_masks(const struct flow_table *table) |
574 | { | |
575 | struct sw_flow_mask *mask; | |
576 | int num = 0; | |
577 | ||
578 | list_for_each_entry(mask, &table->mask_list, list) | |
579 | num++; | |
580 | ||
581 | return num; | |
582 | } | |
583 | ||
74ed7ab9 JS |
584 | static struct table_instance *table_instance_expand(struct table_instance *ti, |
585 | bool ufid) | |
b637e498 | 586 | { |
74ed7ab9 | 587 | return table_instance_rehash(ti, ti->n_buckets * 2, ufid); |
e6445719 PS |
588 | } |
589 | ||
56c19868 JR |
590 | /* Remove 'mask' from the mask list, if it is not needed any more. */ |
591 | static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask) | |
592 | { | |
593 | if (mask) { | |
594 | /* ovs-lock is required to protect mask-refcount and | |
595 | * mask list. | |
596 | */ | |
597 | ASSERT_OVSL(); | |
598 | BUG_ON(!mask->ref_count); | |
599 | mask->ref_count--; | |
600 | ||
601 | if (!mask->ref_count) { | |
602 | list_del_rcu(&mask->list); | |
603 | kfree_rcu(mask, rcu); | |
604 | } | |
605 | } | |
606 | } | |
607 | ||
608 | /* Must be called with OVS mutex held. */ | |
e6445719 PS |
609 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow) |
610 | { | |
b637e498 | 611 | struct table_instance *ti = ovsl_dereference(table->ti); |
74ed7ab9 | 612 | struct table_instance *ufid_ti = ovsl_dereference(table->ufid_ti); |
b637e498 | 613 | |
e6445719 | 614 | BUG_ON(table->count == 0); |
74ed7ab9 | 615 | hlist_del_rcu(&flow->flow_table.node[ti->node_ver]); |
e6445719 | 616 | table->count--; |
74ed7ab9 JS |
617 | if (ovs_identifier_is_ufid(&flow->id)) { |
618 | hlist_del_rcu(&flow->ufid_table.node[ufid_ti->node_ver]); | |
619 | table->ufid_count--; | |
620 | } | |
56c19868 JR |
621 | |
622 | /* RCU delete the mask. 'flow->mask' is not NULLed, as it should be | |
623 | * accessible as long as the RCU read lock is held. | |
624 | */ | |
625 | flow_mask_remove(table, flow->mask); | |
e6445719 PS |
626 | } |
627 | ||
618ed0c8 | 628 | static struct sw_flow_mask *mask_alloc(void) |
e6445719 PS |
629 | { |
630 | struct sw_flow_mask *mask; | |
631 | ||
632 | mask = kmalloc(sizeof(*mask), GFP_KERNEL); | |
633 | if (mask) | |
e80857cc | 634 | mask->ref_count = 1; |
e6445719 PS |
635 | |
636 | return mask; | |
637 | } | |
638 | ||
e6445719 PS |
639 | static bool mask_equal(const struct sw_flow_mask *a, |
640 | const struct sw_flow_mask *b) | |
641 | { | |
7085130b DDP |
642 | const u8 *a_ = (const u8 *)&a->key + a->range.start; |
643 | const u8 *b_ = (const u8 *)&b->key + b->range.start; | |
e6445719 PS |
644 | |
645 | return (a->range.end == b->range.end) | |
646 | && (a->range.start == b->range.start) | |
647 | && (memcmp(a_, b_, range_n_bytes(&a->range)) == 0); | |
648 | } | |
649 | ||
618ed0c8 | 650 | static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl, |
e6445719 PS |
651 | const struct sw_flow_mask *mask) |
652 | { | |
653 | struct list_head *ml; | |
654 | ||
b637e498 | 655 | list_for_each(ml, &tbl->mask_list) { |
e6445719 PS |
656 | struct sw_flow_mask *m; |
657 | m = container_of(ml, struct sw_flow_mask, list); | |
658 | if (mask_equal(mask, m)) | |
659 | return m; | |
660 | } | |
661 | ||
662 | return NULL; | |
663 | } | |
664 | ||
d1211908 | 665 | /* Add 'mask' into the mask list, if it is not already there. */ |
618ed0c8 | 666 | static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow, |
12eb18f7 | 667 | const struct sw_flow_mask *new) |
618ed0c8 PS |
668 | { |
669 | struct sw_flow_mask *mask; | |
670 | mask = flow_mask_find(tbl, new); | |
671 | if (!mask) { | |
672 | /* Allocate a new mask if none exsits. */ | |
673 | mask = mask_alloc(); | |
674 | if (!mask) | |
675 | return -ENOMEM; | |
676 | mask->key = new->key; | |
677 | mask->range = new->range; | |
678 | list_add_rcu(&mask->list, &tbl->mask_list); | |
e80857cc AZ |
679 | } else { |
680 | BUG_ON(!mask->ref_count); | |
681 | mask->ref_count++; | |
618ed0c8 PS |
682 | } |
683 | ||
618ed0c8 PS |
684 | flow->mask = mask; |
685 | return 0; | |
686 | } | |
687 | ||
56c19868 | 688 | /* Must be called with OVS mutex held. */ |
d29ab6f8 | 689 | static void flow_key_insert(struct flow_table *table, struct sw_flow *flow) |
e6445719 | 690 | { |
618ed0c8 PS |
691 | struct table_instance *new_ti = NULL; |
692 | struct table_instance *ti; | |
618ed0c8 | 693 | |
74ed7ab9 | 694 | flow->flow_table.hash = flow_hash(&flow->key, &flow->mask->range); |
618ed0c8 PS |
695 | ti = ovsl_dereference(table->ti); |
696 | table_instance_insert(ti, flow); | |
697 | table->count++; | |
698 | ||
699 | /* Expand table, if necessary, to make room. */ | |
700 | if (table->count > ti->n_buckets) | |
74ed7ab9 | 701 | new_ti = table_instance_expand(ti, false); |
618ed0c8 | 702 | else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL)) |
74ed7ab9 | 703 | new_ti = table_instance_rehash(ti, ti->n_buckets, false); |
618ed0c8 PS |
704 | |
705 | if (new_ti) { | |
706 | rcu_assign_pointer(table->ti, new_ti); | |
74ed7ab9 | 707 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); |
618ed0c8 PS |
708 | table->last_rehash = jiffies; |
709 | } | |
d29ab6f8 JS |
710 | } |
711 | ||
74ed7ab9 JS |
712 | /* Must be called with OVS mutex held. */ |
713 | static void flow_ufid_insert(struct flow_table *table, struct sw_flow *flow) | |
714 | { | |
715 | struct table_instance *ti; | |
716 | ||
717 | flow->ufid_table.hash = ufid_hash(&flow->id); | |
718 | ti = ovsl_dereference(table->ufid_ti); | |
719 | ufid_table_instance_insert(ti, flow); | |
720 | table->ufid_count++; | |
721 | ||
722 | /* Expand table, if necessary, to make room. */ | |
723 | if (table->ufid_count > ti->n_buckets) { | |
724 | struct table_instance *new_ti; | |
725 | ||
726 | new_ti = table_instance_expand(ti, true); | |
727 | if (new_ti) { | |
728 | rcu_assign_pointer(table->ufid_ti, new_ti); | |
729 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); | |
730 | } | |
731 | } | |
732 | } | |
733 | ||
d29ab6f8 JS |
734 | /* Must be called with OVS mutex held. */ |
735 | int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow, | |
736 | const struct sw_flow_mask *mask) | |
737 | { | |
738 | int err; | |
739 | ||
740 | err = flow_mask_insert(table, flow, mask); | |
741 | if (err) | |
742 | return err; | |
743 | flow_key_insert(table, flow); | |
74ed7ab9 JS |
744 | if (ovs_identifier_is_ufid(&flow->id)) |
745 | flow_ufid_insert(table, flow); | |
d29ab6f8 | 746 | |
618ed0c8 | 747 | return 0; |
e6445719 PS |
748 | } |
749 | ||
750 | /* Initializes the flow module. | |
751 | * Returns zero if successful or a negative error code. */ | |
752 | int ovs_flow_init(void) | |
753 | { | |
754 | BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long)); | |
755 | BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long)); | |
756 | ||
63e7959c | 757 | flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow) |
bac541e4 | 758 | + (nr_node_ids |
63e7959c JR |
759 | * sizeof(struct flow_stats *)), |
760 | 0, 0, NULL); | |
e6445719 PS |
761 | if (flow_cache == NULL) |
762 | return -ENOMEM; | |
763 | ||
63e7959c JR |
764 | flow_stats_cache |
765 | = kmem_cache_create("sw_flow_stats", sizeof(struct flow_stats), | |
766 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
767 | if (flow_stats_cache == NULL) { | |
768 | kmem_cache_destroy(flow_cache); | |
769 | flow_cache = NULL; | |
770 | return -ENOMEM; | |
771 | } | |
772 | ||
e6445719 PS |
773 | return 0; |
774 | } | |
775 | ||
776 | /* Uninitializes the flow module. */ | |
777 | void ovs_flow_exit(void) | |
778 | { | |
63e7959c | 779 | kmem_cache_destroy(flow_stats_cache); |
e6445719 PS |
780 | kmem_cache_destroy(flow_cache); |
781 | } |