Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2007-2013 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 | * 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" |
| 21 | #include <linux/uaccess.h> |
| 22 | #include <linux/netdevice.h> |
| 23 | #include <linux/etherdevice.h> |
| 24 | #include <linux/if_ether.h> |
| 25 | #include <linux/if_vlan.h> |
| 26 | #include <net/llc_pdu.h> |
| 27 | #include <linux/kernel.h> |
Francesco Fusco | 500f808 | 2013-12-12 16:09:06 +0100 | [diff] [blame^] | 28 | #include <linux/hash.h> |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 29 | #include <linux/jiffies.h> |
| 30 | #include <linux/llc.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/in.h> |
| 33 | #include <linux/rcupdate.h> |
| 34 | #include <linux/if_arp.h> |
| 35 | #include <linux/ip.h> |
| 36 | #include <linux/ipv6.h> |
| 37 | #include <linux/sctp.h> |
| 38 | #include <linux/tcp.h> |
| 39 | #include <linux/udp.h> |
| 40 | #include <linux/icmp.h> |
| 41 | #include <linux/icmpv6.h> |
| 42 | #include <linux/rculist.h> |
| 43 | #include <net/ip.h> |
| 44 | #include <net/ipv6.h> |
| 45 | #include <net/ndisc.h> |
| 46 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 47 | #include "datapath.h" |
| 48 | |
| 49 | #define TBL_MIN_BUCKETS 1024 |
| 50 | #define REHASH_INTERVAL (10 * 60 * HZ) |
| 51 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 52 | static struct kmem_cache *flow_cache; |
| 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, |
| 60 | const struct sw_flow_mask *mask) |
| 61 | { |
| 62 | const long *m = (long *)((u8 *)&mask->key + mask->range.start); |
| 63 | const long *s = (long *)((u8 *)src + mask->range.start); |
| 64 | long *d = (long *)((u8 *)dst + mask->range.start); |
| 65 | int i; |
| 66 | |
| 67 | /* The memory outside of the 'mask->range' are not set since |
| 68 | * further operations on 'dst' only uses contents within |
| 69 | * 'mask->range'. |
| 70 | */ |
| 71 | for (i = 0; i < range_n_bytes(&mask->range); i += sizeof(long)) |
| 72 | *d++ = *s++ & *m++; |
| 73 | } |
| 74 | |
| 75 | struct sw_flow *ovs_flow_alloc(void) |
| 76 | { |
| 77 | struct sw_flow *flow; |
| 78 | |
| 79 | flow = kmem_cache_alloc(flow_cache, GFP_KERNEL); |
| 80 | if (!flow) |
| 81 | return ERR_PTR(-ENOMEM); |
| 82 | |
| 83 | spin_lock_init(&flow->lock); |
| 84 | flow->sf_acts = NULL; |
| 85 | flow->mask = NULL; |
| 86 | |
| 87 | return flow; |
| 88 | } |
| 89 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 90 | int ovs_flow_tbl_count(struct flow_table *table) |
| 91 | { |
| 92 | return table->count; |
| 93 | } |
| 94 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 95 | static struct flex_array *alloc_buckets(unsigned int n_buckets) |
| 96 | { |
| 97 | struct flex_array *buckets; |
| 98 | int i, err; |
| 99 | |
| 100 | buckets = flex_array_alloc(sizeof(struct hlist_head), |
| 101 | n_buckets, GFP_KERNEL); |
| 102 | if (!buckets) |
| 103 | return NULL; |
| 104 | |
| 105 | err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL); |
| 106 | if (err) { |
| 107 | flex_array_free(buckets); |
| 108 | return NULL; |
| 109 | } |
| 110 | |
| 111 | for (i = 0; i < n_buckets; i++) |
| 112 | INIT_HLIST_HEAD((struct hlist_head *) |
| 113 | flex_array_get(buckets, i)); |
| 114 | |
| 115 | return buckets; |
| 116 | } |
| 117 | |
| 118 | static void flow_free(struct sw_flow *flow) |
| 119 | { |
| 120 | kfree((struct sf_flow_acts __force *)flow->sf_acts); |
| 121 | kmem_cache_free(flow_cache, flow); |
| 122 | } |
| 123 | |
| 124 | static void rcu_free_flow_callback(struct rcu_head *rcu) |
| 125 | { |
| 126 | struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); |
| 127 | |
| 128 | flow_free(flow); |
| 129 | } |
| 130 | |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 131 | static void rcu_free_sw_flow_mask_cb(struct rcu_head *rcu) |
| 132 | { |
| 133 | struct sw_flow_mask *mask = container_of(rcu, struct sw_flow_mask, rcu); |
| 134 | |
| 135 | kfree(mask); |
| 136 | } |
| 137 | |
| 138 | static void flow_mask_del_ref(struct sw_flow_mask *mask, bool deferred) |
| 139 | { |
| 140 | if (!mask) |
| 141 | return; |
| 142 | |
| 143 | BUG_ON(!mask->ref_count); |
| 144 | mask->ref_count--; |
| 145 | |
| 146 | if (!mask->ref_count) { |
| 147 | list_del_rcu(&mask->list); |
| 148 | if (deferred) |
| 149 | call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb); |
| 150 | else |
| 151 | kfree(mask); |
| 152 | } |
| 153 | } |
| 154 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 155 | void ovs_flow_free(struct sw_flow *flow, bool deferred) |
| 156 | { |
| 157 | if (!flow) |
| 158 | return; |
| 159 | |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 160 | flow_mask_del_ref(flow->mask, deferred); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 161 | |
| 162 | if (deferred) |
| 163 | call_rcu(&flow->rcu, rcu_free_flow_callback); |
| 164 | else |
| 165 | flow_free(flow); |
| 166 | } |
| 167 | |
| 168 | static void free_buckets(struct flex_array *buckets) |
| 169 | { |
| 170 | flex_array_free(buckets); |
| 171 | } |
| 172 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 173 | static void __table_instance_destroy(struct table_instance *ti) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 174 | { |
| 175 | int i; |
| 176 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 177 | if (ti->keep_flows) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 178 | goto skip_flows; |
| 179 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 180 | for (i = 0; i < ti->n_buckets; i++) { |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 181 | struct sw_flow *flow; |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 182 | struct hlist_head *head = flex_array_get(ti->buckets, i); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 183 | struct hlist_node *n; |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 184 | int ver = ti->node_ver; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 185 | |
| 186 | hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) { |
| 187 | hlist_del(&flow->hash_node[ver]); |
| 188 | ovs_flow_free(flow, false); |
| 189 | } |
| 190 | } |
| 191 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 192 | skip_flows: |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 193 | free_buckets(ti->buckets); |
| 194 | kfree(ti); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 195 | } |
| 196 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 197 | static struct table_instance *table_instance_alloc(int new_size) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 198 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 199 | struct table_instance *ti = kmalloc(sizeof(*ti), GFP_KERNEL); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 200 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 201 | if (!ti) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 202 | return NULL; |
| 203 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 204 | ti->buckets = alloc_buckets(new_size); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 205 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 206 | if (!ti->buckets) { |
| 207 | kfree(ti); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 208 | return NULL; |
| 209 | } |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 210 | ti->n_buckets = new_size; |
| 211 | ti->node_ver = 0; |
| 212 | ti->keep_flows = false; |
| 213 | get_random_bytes(&ti->hash_seed, sizeof(u32)); |
| 214 | |
| 215 | return ti; |
| 216 | } |
| 217 | |
| 218 | int ovs_flow_tbl_init(struct flow_table *table) |
| 219 | { |
| 220 | struct table_instance *ti; |
| 221 | |
| 222 | ti = table_instance_alloc(TBL_MIN_BUCKETS); |
| 223 | |
| 224 | if (!ti) |
| 225 | return -ENOMEM; |
| 226 | |
| 227 | rcu_assign_pointer(table->ti, ti); |
| 228 | INIT_LIST_HEAD(&table->mask_list); |
| 229 | table->last_rehash = jiffies; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 230 | table->count = 0; |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 231 | return 0; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) |
| 235 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 236 | struct table_instance *ti = container_of(rcu, struct table_instance, rcu); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 237 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 238 | __table_instance_destroy(ti); |
| 239 | } |
| 240 | |
| 241 | static void table_instance_destroy(struct table_instance *ti, bool deferred) |
| 242 | { |
| 243 | if (!ti) |
| 244 | return; |
| 245 | |
| 246 | if (deferred) |
| 247 | call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb); |
| 248 | else |
| 249 | __table_instance_destroy(ti); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 252 | void ovs_flow_tbl_destroy(struct flow_table *table) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 253 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 254 | struct table_instance *ti = ovsl_dereference(table->ti); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 255 | |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 256 | table_instance_destroy(ti, false); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 257 | } |
| 258 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 259 | struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti, |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 260 | u32 *bucket, u32 *last) |
| 261 | { |
| 262 | struct sw_flow *flow; |
| 263 | struct hlist_head *head; |
| 264 | int ver; |
| 265 | int i; |
| 266 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 267 | ver = ti->node_ver; |
| 268 | while (*bucket < ti->n_buckets) { |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 269 | i = 0; |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 270 | head = flex_array_get(ti->buckets, *bucket); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 271 | hlist_for_each_entry_rcu(flow, head, hash_node[ver]) { |
| 272 | if (i < *last) { |
| 273 | i++; |
| 274 | continue; |
| 275 | } |
| 276 | *last = i + 1; |
| 277 | return flow; |
| 278 | } |
| 279 | (*bucket)++; |
| 280 | *last = 0; |
| 281 | } |
| 282 | |
| 283 | return NULL; |
| 284 | } |
| 285 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 286 | static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 287 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 288 | hash = jhash_1word(hash, ti->hash_seed); |
| 289 | return flex_array_get(ti->buckets, |
| 290 | (hash & (ti->n_buckets - 1))); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 291 | } |
| 292 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 293 | static void table_instance_insert(struct table_instance *ti, struct sw_flow *flow) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 294 | { |
| 295 | struct hlist_head *head; |
| 296 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 297 | head = find_bucket(ti, flow->hash); |
| 298 | hlist_add_head_rcu(&flow->hash_node[ti->node_ver], head); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 299 | } |
| 300 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 301 | static void flow_table_copy_flows(struct table_instance *old, |
| 302 | struct table_instance *new) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 303 | { |
| 304 | int old_ver; |
| 305 | int i; |
| 306 | |
| 307 | old_ver = old->node_ver; |
| 308 | new->node_ver = !old_ver; |
| 309 | |
| 310 | /* Insert in new table. */ |
| 311 | for (i = 0; i < old->n_buckets; i++) { |
| 312 | struct sw_flow *flow; |
| 313 | struct hlist_head *head; |
| 314 | |
| 315 | head = flex_array_get(old->buckets, i); |
| 316 | |
| 317 | hlist_for_each_entry(flow, head, hash_node[old_ver]) |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 318 | table_instance_insert(new, flow); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 319 | } |
| 320 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 321 | old->keep_flows = true; |
| 322 | } |
| 323 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 324 | static struct table_instance *table_instance_rehash(struct table_instance *ti, |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 325 | int n_buckets) |
| 326 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 327 | struct table_instance *new_ti; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 328 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 329 | new_ti = table_instance_alloc(n_buckets); |
| 330 | if (!new_ti) |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 331 | return NULL; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 332 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 333 | flow_table_copy_flows(ti, new_ti); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 334 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 335 | return new_ti; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 338 | int ovs_flow_tbl_flush(struct flow_table *flow_table) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 339 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 340 | struct table_instance *old_ti; |
| 341 | struct table_instance *new_ti; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 342 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 343 | old_ti = ovsl_dereference(flow_table->ti); |
| 344 | new_ti = table_instance_alloc(TBL_MIN_BUCKETS); |
| 345 | if (!new_ti) |
| 346 | return -ENOMEM; |
| 347 | |
| 348 | rcu_assign_pointer(flow_table->ti, new_ti); |
| 349 | flow_table->last_rehash = jiffies; |
| 350 | flow_table->count = 0; |
| 351 | |
| 352 | table_instance_destroy(old_ti, true); |
| 353 | return 0; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | static u32 flow_hash(const struct sw_flow_key *key, int key_start, |
| 357 | int key_end) |
| 358 | { |
| 359 | u32 *hash_key = (u32 *)((u8 *)key + key_start); |
| 360 | int hash_u32s = (key_end - key_start) >> 2; |
| 361 | |
| 362 | /* Make sure number of hash bytes are multiple of u32. */ |
| 363 | BUILD_BUG_ON(sizeof(long) % sizeof(u32)); |
| 364 | |
Francesco Fusco | 500f808 | 2013-12-12 16:09:06 +0100 | [diff] [blame^] | 365 | return arch_fast_hash2(hash_key, hash_u32s, 0); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | static int flow_key_start(const struct sw_flow_key *key) |
| 369 | { |
| 370 | if (key->tun_key.ipv4_dst) |
| 371 | return 0; |
| 372 | else |
| 373 | return rounddown(offsetof(struct sw_flow_key, phy), |
| 374 | sizeof(long)); |
| 375 | } |
| 376 | |
| 377 | static bool cmp_key(const struct sw_flow_key *key1, |
| 378 | const struct sw_flow_key *key2, |
| 379 | int key_start, int key_end) |
| 380 | { |
| 381 | const long *cp1 = (long *)((u8 *)key1 + key_start); |
| 382 | const long *cp2 = (long *)((u8 *)key2 + key_start); |
| 383 | long diffs = 0; |
| 384 | int i; |
| 385 | |
| 386 | for (i = key_start; i < key_end; i += sizeof(long)) |
| 387 | diffs |= *cp1++ ^ *cp2++; |
| 388 | |
| 389 | return diffs == 0; |
| 390 | } |
| 391 | |
| 392 | static bool flow_cmp_masked_key(const struct sw_flow *flow, |
| 393 | const struct sw_flow_key *key, |
| 394 | int key_start, int key_end) |
| 395 | { |
| 396 | return cmp_key(&flow->key, key, key_start, key_end); |
| 397 | } |
| 398 | |
| 399 | bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow, |
| 400 | struct sw_flow_match *match) |
| 401 | { |
| 402 | struct sw_flow_key *key = match->key; |
| 403 | int key_start = flow_key_start(key); |
| 404 | int key_end = match->range.end; |
| 405 | |
| 406 | return cmp_key(&flow->unmasked_key, key, key_start, key_end); |
| 407 | } |
| 408 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 409 | static struct sw_flow *masked_flow_lookup(struct table_instance *ti, |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 410 | const struct sw_flow_key *unmasked, |
| 411 | struct sw_flow_mask *mask) |
| 412 | { |
| 413 | struct sw_flow *flow; |
| 414 | struct hlist_head *head; |
| 415 | int key_start = mask->range.start; |
| 416 | int key_end = mask->range.end; |
| 417 | u32 hash; |
| 418 | struct sw_flow_key masked_key; |
| 419 | |
| 420 | ovs_flow_mask_key(&masked_key, unmasked, mask); |
| 421 | hash = flow_hash(&masked_key, key_start, key_end); |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 422 | head = find_bucket(ti, hash); |
| 423 | hlist_for_each_entry_rcu(flow, head, hash_node[ti->node_ver]) { |
Pravin B Shelar | 8ddd094 | 2013-10-29 23:10:58 -0700 | [diff] [blame] | 424 | if (flow->mask == mask && flow->hash == hash && |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 425 | flow_cmp_masked_key(flow, &masked_key, |
| 426 | key_start, key_end)) |
| 427 | return flow; |
| 428 | } |
| 429 | return NULL; |
| 430 | } |
| 431 | |
| 432 | struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl, |
Andy Zhou | 1bd7116 | 2013-10-22 10:42:46 -0700 | [diff] [blame] | 433 | const struct sw_flow_key *key, |
| 434 | u32 *n_mask_hit) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 435 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 436 | struct table_instance *ti = rcu_dereference(tbl->ti); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 437 | struct sw_flow_mask *mask; |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 438 | struct sw_flow *flow; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 439 | |
Andy Zhou | 1bd7116 | 2013-10-22 10:42:46 -0700 | [diff] [blame] | 440 | *n_mask_hit = 0; |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 441 | list_for_each_entry_rcu(mask, &tbl->mask_list, list) { |
Andy Zhou | 1bd7116 | 2013-10-22 10:42:46 -0700 | [diff] [blame] | 442 | (*n_mask_hit)++; |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 443 | flow = masked_flow_lookup(ti, key, mask); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 444 | if (flow) /* Found */ |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 445 | return flow; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 446 | } |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 447 | return NULL; |
| 448 | } |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 449 | |
Andy Zhou | 1bd7116 | 2013-10-22 10:42:46 -0700 | [diff] [blame] | 450 | int ovs_flow_tbl_num_masks(const struct flow_table *table) |
| 451 | { |
| 452 | struct sw_flow_mask *mask; |
| 453 | int num = 0; |
| 454 | |
| 455 | list_for_each_entry(mask, &table->mask_list, list) |
| 456 | num++; |
| 457 | |
| 458 | return num; |
| 459 | } |
| 460 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 461 | static struct table_instance *table_instance_expand(struct table_instance *ti) |
| 462 | { |
| 463 | return table_instance_rehash(ti, ti->n_buckets * 2); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 464 | } |
| 465 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 466 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow) |
| 467 | { |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 468 | struct table_instance *ti = ovsl_dereference(table->ti); |
| 469 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 470 | BUG_ON(table->count == 0); |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 471 | hlist_del_rcu(&flow->hash_node[ti->node_ver]); |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 472 | table->count--; |
| 473 | } |
| 474 | |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 475 | static struct sw_flow_mask *mask_alloc(void) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 476 | { |
| 477 | struct sw_flow_mask *mask; |
| 478 | |
| 479 | mask = kmalloc(sizeof(*mask), GFP_KERNEL); |
| 480 | if (mask) |
| 481 | mask->ref_count = 0; |
| 482 | |
| 483 | return mask; |
| 484 | } |
| 485 | |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 486 | static void mask_add_ref(struct sw_flow_mask *mask) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 487 | { |
| 488 | mask->ref_count++; |
| 489 | } |
| 490 | |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 491 | static bool mask_equal(const struct sw_flow_mask *a, |
| 492 | const struct sw_flow_mask *b) |
| 493 | { |
| 494 | u8 *a_ = (u8 *)&a->key + a->range.start; |
| 495 | u8 *b_ = (u8 *)&b->key + b->range.start; |
| 496 | |
| 497 | return (a->range.end == b->range.end) |
| 498 | && (a->range.start == b->range.start) |
| 499 | && (memcmp(a_, b_, range_n_bytes(&a->range)) == 0); |
| 500 | } |
| 501 | |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 502 | static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl, |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 503 | const struct sw_flow_mask *mask) |
| 504 | { |
| 505 | struct list_head *ml; |
| 506 | |
Pravin B Shelar | b637e49 | 2013-10-04 00:14:23 -0700 | [diff] [blame] | 507 | list_for_each(ml, &tbl->mask_list) { |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 508 | struct sw_flow_mask *m; |
| 509 | m = container_of(ml, struct sw_flow_mask, list); |
| 510 | if (mask_equal(mask, m)) |
| 511 | return m; |
| 512 | } |
| 513 | |
| 514 | return NULL; |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * add a new mask into the mask list. |
| 519 | * The caller needs to make sure that 'mask' is not the same |
| 520 | * as any masks that are already on the list. |
| 521 | */ |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 522 | static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow, |
| 523 | struct sw_flow_mask *new) |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 524 | { |
Pravin B Shelar | 618ed0c | 2013-10-04 00:17:42 -0700 | [diff] [blame] | 525 | struct sw_flow_mask *mask; |
| 526 | mask = flow_mask_find(tbl, new); |
| 527 | if (!mask) { |
| 528 | /* Allocate a new mask if none exsits. */ |
| 529 | mask = mask_alloc(); |
| 530 | if (!mask) |
| 531 | return -ENOMEM; |
| 532 | mask->key = new->key; |
| 533 | mask->range = new->range; |
| 534 | list_add_rcu(&mask->list, &tbl->mask_list); |
| 535 | } |
| 536 | |
| 537 | mask_add_ref(mask); |
| 538 | flow->mask = mask; |
| 539 | return 0; |
| 540 | } |
| 541 | |
| 542 | int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow, |
| 543 | struct sw_flow_mask *mask) |
| 544 | { |
| 545 | struct table_instance *new_ti = NULL; |
| 546 | struct table_instance *ti; |
| 547 | int err; |
| 548 | |
| 549 | err = flow_mask_insert(table, flow, mask); |
| 550 | if (err) |
| 551 | return err; |
| 552 | |
| 553 | flow->hash = flow_hash(&flow->key, flow->mask->range.start, |
| 554 | flow->mask->range.end); |
| 555 | ti = ovsl_dereference(table->ti); |
| 556 | table_instance_insert(ti, flow); |
| 557 | table->count++; |
| 558 | |
| 559 | /* Expand table, if necessary, to make room. */ |
| 560 | if (table->count > ti->n_buckets) |
| 561 | new_ti = table_instance_expand(ti); |
| 562 | else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL)) |
| 563 | new_ti = table_instance_rehash(ti, ti->n_buckets); |
| 564 | |
| 565 | if (new_ti) { |
| 566 | rcu_assign_pointer(table->ti, new_ti); |
| 567 | table_instance_destroy(ti, true); |
| 568 | table->last_rehash = jiffies; |
| 569 | } |
| 570 | return 0; |
Pravin B Shelar | e644571 | 2013-10-03 18:16:47 -0700 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | /* Initializes the flow module. |
| 574 | * Returns zero if successful or a negative error code. */ |
| 575 | int ovs_flow_init(void) |
| 576 | { |
| 577 | BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long)); |
| 578 | BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long)); |
| 579 | |
| 580 | flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0, |
| 581 | 0, NULL); |
| 582 | if (flow_cache == NULL) |
| 583 | return -ENOMEM; |
| 584 | |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | /* Uninitializes the flow module. */ |
| 589 | void ovs_flow_exit(void) |
| 590 | { |
| 591 | kmem_cache_destroy(flow_cache); |
| 592 | } |