Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 2 | * Copyright (c) 2016 Facebook |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 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 | #include <linux/bpf.h> |
| 14 | #include <linux/jhash.h> |
| 15 | #include <linux/filter.h> |
| 16 | #include <linux/vmalloc.h> |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 17 | #include "percpu_freelist.h" |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 18 | |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 19 | struct bucket { |
| 20 | struct hlist_head head; |
| 21 | raw_spinlock_t lock; |
| 22 | }; |
| 23 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 24 | struct bpf_htab { |
| 25 | struct bpf_map map; |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 26 | struct bucket *buckets; |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 27 | void *elems; |
| 28 | struct pcpu_freelist freelist; |
tom.leiming@gmail.com | 6591f1e | 2015-12-29 22:40:25 +0800 | [diff] [blame] | 29 | atomic_t count; /* number of elements in this hashtable */ |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 30 | u32 n_buckets; /* number of hash buckets */ |
| 31 | u32 elem_size; /* size of each element in bytes */ |
| 32 | }; |
| 33 | |
| 34 | /* each htab element is struct htab_elem + key + value */ |
| 35 | struct htab_elem { |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 36 | union { |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 37 | struct hlist_node hash_node; |
| 38 | struct bpf_htab *htab; |
| 39 | struct pcpu_freelist_node fnode; |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 40 | }; |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 41 | struct rcu_head rcu; |
| 42 | u32 hash; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 43 | char key[0] __aligned(8); |
| 44 | }; |
| 45 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 46 | static inline void htab_elem_set_ptr(struct htab_elem *l, u32 key_size, |
| 47 | void __percpu *pptr) |
| 48 | { |
| 49 | *(void __percpu **)(l->key + key_size) = pptr; |
| 50 | } |
| 51 | |
| 52 | static inline void __percpu *htab_elem_get_ptr(struct htab_elem *l, u32 key_size) |
| 53 | { |
| 54 | return *(void __percpu **)(l->key + key_size); |
| 55 | } |
| 56 | |
| 57 | static struct htab_elem *get_htab_elem(struct bpf_htab *htab, int i) |
| 58 | { |
| 59 | return (struct htab_elem *) (htab->elems + i * htab->elem_size); |
| 60 | } |
| 61 | |
| 62 | static void htab_free_elems(struct bpf_htab *htab) |
| 63 | { |
| 64 | int i; |
| 65 | |
| 66 | if (htab->map.map_type != BPF_MAP_TYPE_PERCPU_HASH) |
| 67 | goto free_elems; |
| 68 | |
| 69 | for (i = 0; i < htab->map.max_entries; i++) { |
| 70 | void __percpu *pptr; |
| 71 | |
| 72 | pptr = htab_elem_get_ptr(get_htab_elem(htab, i), |
| 73 | htab->map.key_size); |
| 74 | free_percpu(pptr); |
| 75 | } |
| 76 | free_elems: |
| 77 | vfree(htab->elems); |
| 78 | } |
| 79 | |
| 80 | static int prealloc_elems_and_freelist(struct bpf_htab *htab) |
| 81 | { |
| 82 | int err = -ENOMEM, i; |
| 83 | |
| 84 | htab->elems = vzalloc(htab->elem_size * htab->map.max_entries); |
| 85 | if (!htab->elems) |
| 86 | return -ENOMEM; |
| 87 | |
| 88 | if (htab->map.map_type != BPF_MAP_TYPE_PERCPU_HASH) |
| 89 | goto skip_percpu_elems; |
| 90 | |
| 91 | for (i = 0; i < htab->map.max_entries; i++) { |
| 92 | u32 size = round_up(htab->map.value_size, 8); |
| 93 | void __percpu *pptr; |
| 94 | |
| 95 | pptr = __alloc_percpu_gfp(size, 8, GFP_USER | __GFP_NOWARN); |
| 96 | if (!pptr) |
| 97 | goto free_elems; |
| 98 | htab_elem_set_ptr(get_htab_elem(htab, i), htab->map.key_size, |
| 99 | pptr); |
| 100 | } |
| 101 | |
| 102 | skip_percpu_elems: |
| 103 | err = pcpu_freelist_init(&htab->freelist); |
| 104 | if (err) |
| 105 | goto free_elems; |
| 106 | |
| 107 | pcpu_freelist_populate(&htab->freelist, htab->elems, htab->elem_size, |
| 108 | htab->map.max_entries); |
| 109 | return 0; |
| 110 | |
| 111 | free_elems: |
| 112 | htab_free_elems(htab); |
| 113 | return err; |
| 114 | } |
| 115 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 116 | /* Called from syscall */ |
| 117 | static struct bpf_map *htab_map_alloc(union bpf_attr *attr) |
| 118 | { |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 119 | bool percpu = attr->map_type == BPF_MAP_TYPE_PERCPU_HASH; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 120 | struct bpf_htab *htab; |
| 121 | int err, i; |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 122 | u64 cost; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 123 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 124 | if (attr->map_flags & ~BPF_F_NO_PREALLOC) |
| 125 | /* reserved bits should not be used */ |
| 126 | return ERR_PTR(-EINVAL); |
| 127 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 128 | htab = kzalloc(sizeof(*htab), GFP_USER); |
| 129 | if (!htab) |
| 130 | return ERR_PTR(-ENOMEM); |
| 131 | |
| 132 | /* mandatory map attributes */ |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 133 | htab->map.map_type = attr->map_type; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 134 | htab->map.key_size = attr->key_size; |
| 135 | htab->map.value_size = attr->value_size; |
| 136 | htab->map.max_entries = attr->max_entries; |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 137 | htab->map.map_flags = attr->map_flags; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 138 | |
| 139 | /* check sanity of attributes. |
| 140 | * value_size == 0 may be allowed in the future to use map as a set |
| 141 | */ |
| 142 | err = -EINVAL; |
| 143 | if (htab->map.max_entries == 0 || htab->map.key_size == 0 || |
| 144 | htab->map.value_size == 0) |
| 145 | goto free_htab; |
| 146 | |
| 147 | /* hash table size must be power of 2 */ |
| 148 | htab->n_buckets = roundup_pow_of_two(htab->map.max_entries); |
| 149 | |
| 150 | err = -E2BIG; |
| 151 | if (htab->map.key_size > MAX_BPF_STACK) |
| 152 | /* eBPF programs initialize keys on stack, so they cannot be |
| 153 | * larger than max stack size |
| 154 | */ |
| 155 | goto free_htab; |
| 156 | |
Alexei Starovoitov | 01b3f52 | 2015-11-29 16:59:35 -0800 | [diff] [blame] | 157 | if (htab->map.value_size >= (1 << (KMALLOC_SHIFT_MAX - 1)) - |
| 158 | MAX_BPF_STACK - sizeof(struct htab_elem)) |
| 159 | /* if value_size is bigger, the user space won't be able to |
| 160 | * access the elements via bpf syscall. This check also makes |
| 161 | * sure that the elem_size doesn't overflow and it's |
| 162 | * kmalloc-able later in htab_map_update_elem() |
| 163 | */ |
| 164 | goto free_htab; |
| 165 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 166 | if (percpu && round_up(htab->map.value_size, 8) > PCPU_MIN_UNIT_SIZE) |
| 167 | /* make sure the size for pcpu_alloc() is reasonable */ |
| 168 | goto free_htab; |
| 169 | |
Alexei Starovoitov | 01b3f52 | 2015-11-29 16:59:35 -0800 | [diff] [blame] | 170 | htab->elem_size = sizeof(struct htab_elem) + |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 171 | round_up(htab->map.key_size, 8); |
| 172 | if (percpu) |
| 173 | htab->elem_size += sizeof(void *); |
| 174 | else |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 175 | htab->elem_size += round_up(htab->map.value_size, 8); |
Alexei Starovoitov | 01b3f52 | 2015-11-29 16:59:35 -0800 | [diff] [blame] | 176 | |
Alexei Starovoitov | daaf427 | 2014-11-18 17:32:16 -0800 | [diff] [blame] | 177 | /* prevent zero size kmalloc and check for u32 overflow */ |
| 178 | if (htab->n_buckets == 0 || |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 179 | htab->n_buckets > U32_MAX / sizeof(struct bucket)) |
Alexei Starovoitov | daaf427 | 2014-11-18 17:32:16 -0800 | [diff] [blame] | 180 | goto free_htab; |
| 181 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 182 | cost = (u64) htab->n_buckets * sizeof(struct bucket) + |
| 183 | (u64) htab->elem_size * htab->map.max_entries; |
| 184 | |
| 185 | if (percpu) |
| 186 | cost += (u64) round_up(htab->map.value_size, 8) * |
| 187 | num_possible_cpus() * htab->map.max_entries; |
| 188 | |
| 189 | if (cost >= U32_MAX - PAGE_SIZE) |
Alexei Starovoitov | 01b3f52 | 2015-11-29 16:59:35 -0800 | [diff] [blame] | 190 | /* make sure page count doesn't overflow */ |
| 191 | goto free_htab; |
| 192 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 193 | htab->map.pages = round_up(cost, PAGE_SIZE) >> PAGE_SHIFT; |
Alexei Starovoitov | 01b3f52 | 2015-11-29 16:59:35 -0800 | [diff] [blame] | 194 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 195 | /* if map size is larger than memlock limit, reject it early */ |
| 196 | err = bpf_map_precharge_memlock(htab->map.pages); |
| 197 | if (err) |
| 198 | goto free_htab; |
| 199 | |
Alexei Starovoitov | 01b3f52 | 2015-11-29 16:59:35 -0800 | [diff] [blame] | 200 | err = -ENOMEM; |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 201 | htab->buckets = kmalloc_array(htab->n_buckets, sizeof(struct bucket), |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 202 | GFP_USER | __GFP_NOWARN); |
| 203 | |
| 204 | if (!htab->buckets) { |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 205 | htab->buckets = vmalloc(htab->n_buckets * sizeof(struct bucket)); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 206 | if (!htab->buckets) |
| 207 | goto free_htab; |
| 208 | } |
| 209 | |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 210 | for (i = 0; i < htab->n_buckets; i++) { |
| 211 | INIT_HLIST_HEAD(&htab->buckets[i].head); |
| 212 | raw_spin_lock_init(&htab->buckets[i].lock); |
| 213 | } |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 214 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 215 | if (!(attr->map_flags & BPF_F_NO_PREALLOC)) { |
| 216 | err = prealloc_elems_and_freelist(htab); |
| 217 | if (err) |
| 218 | goto free_buckets; |
| 219 | } |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 220 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 221 | return &htab->map; |
| 222 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 223 | free_buckets: |
| 224 | kvfree(htab->buckets); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 225 | free_htab: |
| 226 | kfree(htab); |
| 227 | return ERR_PTR(err); |
| 228 | } |
| 229 | |
| 230 | static inline u32 htab_map_hash(const void *key, u32 key_len) |
| 231 | { |
| 232 | return jhash(key, key_len, 0); |
| 233 | } |
| 234 | |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 235 | static inline struct bucket *__select_bucket(struct bpf_htab *htab, u32 hash) |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 236 | { |
| 237 | return &htab->buckets[hash & (htab->n_buckets - 1)]; |
| 238 | } |
| 239 | |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 240 | static inline struct hlist_head *select_bucket(struct bpf_htab *htab, u32 hash) |
| 241 | { |
| 242 | return &__select_bucket(htab, hash)->head; |
| 243 | } |
| 244 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 245 | static struct htab_elem *lookup_elem_raw(struct hlist_head *head, u32 hash, |
| 246 | void *key, u32 key_size) |
| 247 | { |
| 248 | struct htab_elem *l; |
| 249 | |
| 250 | hlist_for_each_entry_rcu(l, head, hash_node) |
| 251 | if (l->hash == hash && !memcmp(&l->key, key, key_size)) |
| 252 | return l; |
| 253 | |
| 254 | return NULL; |
| 255 | } |
| 256 | |
| 257 | /* Called from syscall or from eBPF program */ |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 258 | static void *__htab_map_lookup_elem(struct bpf_map *map, void *key) |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 259 | { |
| 260 | struct bpf_htab *htab = container_of(map, struct bpf_htab, map); |
| 261 | struct hlist_head *head; |
| 262 | struct htab_elem *l; |
| 263 | u32 hash, key_size; |
| 264 | |
| 265 | /* Must be called with rcu_read_lock. */ |
| 266 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 267 | |
| 268 | key_size = map->key_size; |
| 269 | |
| 270 | hash = htab_map_hash(key, key_size); |
| 271 | |
| 272 | head = select_bucket(htab, hash); |
| 273 | |
| 274 | l = lookup_elem_raw(head, hash, key, key_size); |
| 275 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 276 | return l; |
| 277 | } |
| 278 | |
| 279 | static void *htab_map_lookup_elem(struct bpf_map *map, void *key) |
| 280 | { |
| 281 | struct htab_elem *l = __htab_map_lookup_elem(map, key); |
| 282 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 283 | if (l) |
| 284 | return l->key + round_up(map->key_size, 8); |
| 285 | |
| 286 | return NULL; |
| 287 | } |
| 288 | |
| 289 | /* Called from syscall */ |
| 290 | static int htab_map_get_next_key(struct bpf_map *map, void *key, void *next_key) |
| 291 | { |
| 292 | struct bpf_htab *htab = container_of(map, struct bpf_htab, map); |
| 293 | struct hlist_head *head; |
| 294 | struct htab_elem *l, *next_l; |
| 295 | u32 hash, key_size; |
| 296 | int i; |
| 297 | |
| 298 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 299 | |
| 300 | key_size = map->key_size; |
| 301 | |
| 302 | hash = htab_map_hash(key, key_size); |
| 303 | |
| 304 | head = select_bucket(htab, hash); |
| 305 | |
| 306 | /* lookup the key */ |
| 307 | l = lookup_elem_raw(head, hash, key, key_size); |
| 308 | |
| 309 | if (!l) { |
| 310 | i = 0; |
| 311 | goto find_first_elem; |
| 312 | } |
| 313 | |
| 314 | /* key was found, get next key in the same bucket */ |
| 315 | next_l = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu(&l->hash_node)), |
| 316 | struct htab_elem, hash_node); |
| 317 | |
| 318 | if (next_l) { |
| 319 | /* if next elem in this hash list is non-zero, just return it */ |
| 320 | memcpy(next_key, next_l->key, key_size); |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | /* no more elements in this hash list, go to the next bucket */ |
| 325 | i = hash & (htab->n_buckets - 1); |
| 326 | i++; |
| 327 | |
| 328 | find_first_elem: |
| 329 | /* iterate over buckets */ |
| 330 | for (; i < htab->n_buckets; i++) { |
| 331 | head = select_bucket(htab, i); |
| 332 | |
| 333 | /* pick first element in the bucket */ |
| 334 | next_l = hlist_entry_safe(rcu_dereference_raw(hlist_first_rcu(head)), |
| 335 | struct htab_elem, hash_node); |
| 336 | if (next_l) { |
| 337 | /* if it's not empty, just return it */ |
| 338 | memcpy(next_key, next_l->key, key_size); |
| 339 | return 0; |
| 340 | } |
| 341 | } |
| 342 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 343 | /* iterated over all buckets and all elements */ |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 344 | return -ENOENT; |
| 345 | } |
| 346 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 347 | static void htab_elem_free(struct bpf_htab *htab, struct htab_elem *l) |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 348 | { |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 349 | if (htab->map.map_type == BPF_MAP_TYPE_PERCPU_HASH) |
| 350 | free_percpu(htab_elem_get_ptr(l, htab->map.key_size)); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 351 | kfree(l); |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 352 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 353 | } |
| 354 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 355 | static void htab_elem_free_rcu(struct rcu_head *head) |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 356 | { |
| 357 | struct htab_elem *l = container_of(head, struct htab_elem, rcu); |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 358 | struct bpf_htab *htab = l->htab; |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 359 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 360 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering while |
| 361 | * we're calling kfree, otherwise deadlock is possible if kprobes |
| 362 | * are placed somewhere inside of slub |
| 363 | */ |
| 364 | preempt_disable(); |
| 365 | __this_cpu_inc(bpf_prog_active); |
| 366 | htab_elem_free(htab, l); |
| 367 | __this_cpu_dec(bpf_prog_active); |
| 368 | preempt_enable(); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 369 | } |
| 370 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 371 | static void free_htab_elem(struct bpf_htab *htab, struct htab_elem *l) |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 372 | { |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 373 | if (!(htab->map.map_flags & BPF_F_NO_PREALLOC)) { |
| 374 | pcpu_freelist_push(&htab->freelist, &l->fnode); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 375 | } else { |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 376 | atomic_dec(&htab->count); |
| 377 | l->htab = htab; |
| 378 | call_rcu(&l->rcu, htab_elem_free_rcu); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 379 | } |
| 380 | } |
| 381 | |
| 382 | static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key, |
| 383 | void *value, u32 key_size, u32 hash, |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 384 | bool percpu, bool onallcpus) |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 385 | { |
| 386 | u32 size = htab->map.value_size; |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 387 | bool prealloc = !(htab->map.map_flags & BPF_F_NO_PREALLOC); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 388 | struct htab_elem *l_new; |
| 389 | void __percpu *pptr; |
| 390 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 391 | if (prealloc) { |
| 392 | l_new = (struct htab_elem *)pcpu_freelist_pop(&htab->freelist); |
| 393 | if (!l_new) |
| 394 | return ERR_PTR(-E2BIG); |
| 395 | } else { |
| 396 | if (atomic_inc_return(&htab->count) > htab->map.max_entries) { |
| 397 | atomic_dec(&htab->count); |
| 398 | return ERR_PTR(-E2BIG); |
| 399 | } |
| 400 | l_new = kmalloc(htab->elem_size, GFP_ATOMIC | __GFP_NOWARN); |
| 401 | if (!l_new) |
| 402 | return ERR_PTR(-ENOMEM); |
| 403 | } |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 404 | |
| 405 | memcpy(l_new->key, key, key_size); |
| 406 | if (percpu) { |
| 407 | /* round up value_size to 8 bytes */ |
| 408 | size = round_up(size, 8); |
| 409 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 410 | if (prealloc) { |
| 411 | pptr = htab_elem_get_ptr(l_new, key_size); |
| 412 | } else { |
| 413 | /* alloc_percpu zero-fills */ |
| 414 | pptr = __alloc_percpu_gfp(size, 8, |
| 415 | GFP_ATOMIC | __GFP_NOWARN); |
| 416 | if (!pptr) { |
| 417 | kfree(l_new); |
| 418 | return ERR_PTR(-ENOMEM); |
| 419 | } |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 420 | } |
| 421 | |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 422 | if (!onallcpus) { |
| 423 | /* copy true value_size bytes */ |
| 424 | memcpy(this_cpu_ptr(pptr), value, htab->map.value_size); |
| 425 | } else { |
| 426 | int off = 0, cpu; |
| 427 | |
| 428 | for_each_possible_cpu(cpu) { |
| 429 | bpf_long_memcpy(per_cpu_ptr(pptr, cpu), |
| 430 | value + off, size); |
| 431 | off += size; |
| 432 | } |
| 433 | } |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 434 | if (!prealloc) |
| 435 | htab_elem_set_ptr(l_new, key_size, pptr); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 436 | } else { |
| 437 | memcpy(l_new->key + round_up(key_size, 8), value, size); |
| 438 | } |
| 439 | |
| 440 | l_new->hash = hash; |
| 441 | return l_new; |
| 442 | } |
| 443 | |
| 444 | static int check_flags(struct bpf_htab *htab, struct htab_elem *l_old, |
| 445 | u64 map_flags) |
| 446 | { |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 447 | if (l_old && map_flags == BPF_NOEXIST) |
| 448 | /* elem already exists */ |
| 449 | return -EEXIST; |
| 450 | |
| 451 | if (!l_old && map_flags == BPF_EXIST) |
| 452 | /* elem doesn't exist, cannot update it */ |
| 453 | return -ENOENT; |
| 454 | |
| 455 | return 0; |
| 456 | } |
| 457 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 458 | /* Called from syscall or from eBPF program */ |
| 459 | static int htab_map_update_elem(struct bpf_map *map, void *key, void *value, |
| 460 | u64 map_flags) |
| 461 | { |
| 462 | struct bpf_htab *htab = container_of(map, struct bpf_htab, map); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 463 | struct htab_elem *l_new = NULL, *l_old; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 464 | struct hlist_head *head; |
| 465 | unsigned long flags; |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 466 | struct bucket *b; |
| 467 | u32 key_size, hash; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 468 | int ret; |
| 469 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 470 | if (unlikely(map_flags > BPF_EXIST)) |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 471 | /* unknown flags */ |
| 472 | return -EINVAL; |
| 473 | |
| 474 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 475 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 476 | key_size = map->key_size; |
| 477 | |
| 478 | hash = htab_map_hash(key, key_size); |
| 479 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 480 | b = __select_bucket(htab, hash); |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 481 | head = &b->head; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 482 | |
| 483 | /* bpf_map_update_elem() can be called in_irq() */ |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 484 | raw_spin_lock_irqsave(&b->lock, flags); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 485 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 486 | l_old = lookup_elem_raw(head, hash, key, key_size); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 487 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 488 | ret = check_flags(htab, l_old, map_flags); |
| 489 | if (ret) |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 490 | goto err; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 491 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 492 | l_new = alloc_htab_elem(htab, key, value, key_size, hash, false, false); |
| 493 | if (IS_ERR(l_new)) { |
| 494 | /* all pre-allocated elements are in use or memory exhausted */ |
| 495 | ret = PTR_ERR(l_new); |
| 496 | goto err; |
| 497 | } |
| 498 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 499 | /* add new element to the head of the list, so that |
| 500 | * concurrent search will find it before old elem |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 501 | */ |
| 502 | hlist_add_head_rcu(&l_new->hash_node, head); |
| 503 | if (l_old) { |
| 504 | hlist_del_rcu(&l_old->hash_node); |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 505 | free_htab_elem(htab, l_old); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 506 | } |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 507 | ret = 0; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 508 | err: |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 509 | raw_spin_unlock_irqrestore(&b->lock, flags); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 510 | return ret; |
| 511 | } |
| 512 | |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 513 | static int __htab_percpu_map_update_elem(struct bpf_map *map, void *key, |
| 514 | void *value, u64 map_flags, |
| 515 | bool onallcpus) |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 516 | { |
| 517 | struct bpf_htab *htab = container_of(map, struct bpf_htab, map); |
| 518 | struct htab_elem *l_new = NULL, *l_old; |
| 519 | struct hlist_head *head; |
| 520 | unsigned long flags; |
| 521 | struct bucket *b; |
| 522 | u32 key_size, hash; |
| 523 | int ret; |
| 524 | |
| 525 | if (unlikely(map_flags > BPF_EXIST)) |
| 526 | /* unknown flags */ |
| 527 | return -EINVAL; |
| 528 | |
| 529 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 530 | |
| 531 | key_size = map->key_size; |
| 532 | |
| 533 | hash = htab_map_hash(key, key_size); |
| 534 | |
| 535 | b = __select_bucket(htab, hash); |
| 536 | head = &b->head; |
| 537 | |
| 538 | /* bpf_map_update_elem() can be called in_irq() */ |
| 539 | raw_spin_lock_irqsave(&b->lock, flags); |
| 540 | |
| 541 | l_old = lookup_elem_raw(head, hash, key, key_size); |
| 542 | |
| 543 | ret = check_flags(htab, l_old, map_flags); |
| 544 | if (ret) |
| 545 | goto err; |
| 546 | |
| 547 | if (l_old) { |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 548 | void __percpu *pptr = htab_elem_get_ptr(l_old, key_size); |
| 549 | u32 size = htab->map.value_size; |
| 550 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 551 | /* per-cpu hash map can update value in-place */ |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 552 | if (!onallcpus) { |
| 553 | memcpy(this_cpu_ptr(pptr), value, size); |
| 554 | } else { |
| 555 | int off = 0, cpu; |
| 556 | |
| 557 | size = round_up(size, 8); |
| 558 | for_each_possible_cpu(cpu) { |
| 559 | bpf_long_memcpy(per_cpu_ptr(pptr, cpu), |
| 560 | value + off, size); |
| 561 | off += size; |
| 562 | } |
| 563 | } |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 564 | } else { |
| 565 | l_new = alloc_htab_elem(htab, key, value, key_size, |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 566 | hash, true, onallcpus); |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 567 | if (IS_ERR(l_new)) { |
| 568 | ret = PTR_ERR(l_new); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 569 | goto err; |
| 570 | } |
| 571 | hlist_add_head_rcu(&l_new->hash_node, head); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 572 | } |
| 573 | ret = 0; |
| 574 | err: |
| 575 | raw_spin_unlock_irqrestore(&b->lock, flags); |
| 576 | return ret; |
| 577 | } |
| 578 | |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 579 | static int htab_percpu_map_update_elem(struct bpf_map *map, void *key, |
| 580 | void *value, u64 map_flags) |
| 581 | { |
| 582 | return __htab_percpu_map_update_elem(map, key, value, map_flags, false); |
| 583 | } |
| 584 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 585 | /* Called from syscall or from eBPF program */ |
| 586 | static int htab_map_delete_elem(struct bpf_map *map, void *key) |
| 587 | { |
| 588 | struct bpf_htab *htab = container_of(map, struct bpf_htab, map); |
| 589 | struct hlist_head *head; |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 590 | struct bucket *b; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 591 | struct htab_elem *l; |
| 592 | unsigned long flags; |
| 593 | u32 hash, key_size; |
| 594 | int ret = -ENOENT; |
| 595 | |
| 596 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 597 | |
| 598 | key_size = map->key_size; |
| 599 | |
| 600 | hash = htab_map_hash(key, key_size); |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 601 | b = __select_bucket(htab, hash); |
| 602 | head = &b->head; |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 603 | |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 604 | raw_spin_lock_irqsave(&b->lock, flags); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 605 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 606 | l = lookup_elem_raw(head, hash, key, key_size); |
| 607 | |
| 608 | if (l) { |
| 609 | hlist_del_rcu(&l->hash_node); |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 610 | free_htab_elem(htab, l); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 611 | ret = 0; |
| 612 | } |
| 613 | |
tom.leiming@gmail.com | 688ecfe | 2015-12-29 22:40:27 +0800 | [diff] [blame] | 614 | raw_spin_unlock_irqrestore(&b->lock, flags); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 615 | return ret; |
| 616 | } |
| 617 | |
| 618 | static void delete_all_elements(struct bpf_htab *htab) |
| 619 | { |
| 620 | int i; |
| 621 | |
| 622 | for (i = 0; i < htab->n_buckets; i++) { |
| 623 | struct hlist_head *head = select_bucket(htab, i); |
| 624 | struct hlist_node *n; |
| 625 | struct htab_elem *l; |
| 626 | |
| 627 | hlist_for_each_entry_safe(l, n, head, hash_node) { |
| 628 | hlist_del_rcu(&l->hash_node); |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 629 | htab_elem_free(htab, l); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 630 | } |
| 631 | } |
| 632 | } |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 633 | /* Called when map->refcnt goes to zero, either from workqueue or from syscall */ |
| 634 | static void htab_map_free(struct bpf_map *map) |
| 635 | { |
| 636 | struct bpf_htab *htab = container_of(map, struct bpf_htab, map); |
| 637 | |
| 638 | /* at this point bpf_prog->aux->refcnt == 0 and this map->refcnt == 0, |
| 639 | * so the programs (can be more than one that used this map) were |
| 640 | * disconnected from events. Wait for outstanding critical sections in |
| 641 | * these programs to complete |
| 642 | */ |
| 643 | synchronize_rcu(); |
| 644 | |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 645 | /* some of free_htab_elem() callbacks for elements of this map may |
| 646 | * not have executed. Wait for them. |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 647 | */ |
Alexei Starovoitov | 6c90598 | 2016-03-07 21:57:15 -0800 | [diff] [blame] | 648 | rcu_barrier(); |
| 649 | if (htab->map.map_flags & BPF_F_NO_PREALLOC) { |
| 650 | delete_all_elements(htab); |
| 651 | } else { |
| 652 | htab_free_elems(htab); |
| 653 | pcpu_freelist_destroy(&htab->freelist); |
| 654 | } |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 655 | kvfree(htab->buckets); |
| 656 | kfree(htab); |
| 657 | } |
| 658 | |
Daniel Borkmann | a2c83ff | 2015-03-01 12:31:42 +0100 | [diff] [blame] | 659 | static const struct bpf_map_ops htab_ops = { |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 660 | .map_alloc = htab_map_alloc, |
| 661 | .map_free = htab_map_free, |
| 662 | .map_get_next_key = htab_map_get_next_key, |
| 663 | .map_lookup_elem = htab_map_lookup_elem, |
| 664 | .map_update_elem = htab_map_update_elem, |
| 665 | .map_delete_elem = htab_map_delete_elem, |
| 666 | }; |
| 667 | |
Daniel Borkmann | a2c83ff | 2015-03-01 12:31:42 +0100 | [diff] [blame] | 668 | static struct bpf_map_type_list htab_type __read_mostly = { |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 669 | .ops = &htab_ops, |
| 670 | .type = BPF_MAP_TYPE_HASH, |
| 671 | }; |
| 672 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 673 | /* Called from eBPF program */ |
| 674 | static void *htab_percpu_map_lookup_elem(struct bpf_map *map, void *key) |
| 675 | { |
| 676 | struct htab_elem *l = __htab_map_lookup_elem(map, key); |
| 677 | |
| 678 | if (l) |
| 679 | return this_cpu_ptr(htab_elem_get_ptr(l, map->key_size)); |
| 680 | else |
| 681 | return NULL; |
| 682 | } |
| 683 | |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 684 | int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value) |
| 685 | { |
| 686 | struct htab_elem *l; |
| 687 | void __percpu *pptr; |
| 688 | int ret = -ENOENT; |
| 689 | int cpu, off = 0; |
| 690 | u32 size; |
| 691 | |
| 692 | /* per_cpu areas are zero-filled and bpf programs can only |
| 693 | * access 'value_size' of them, so copying rounded areas |
| 694 | * will not leak any kernel data |
| 695 | */ |
| 696 | size = round_up(map->value_size, 8); |
| 697 | rcu_read_lock(); |
| 698 | l = __htab_map_lookup_elem(map, key); |
| 699 | if (!l) |
| 700 | goto out; |
| 701 | pptr = htab_elem_get_ptr(l, map->key_size); |
| 702 | for_each_possible_cpu(cpu) { |
| 703 | bpf_long_memcpy(value + off, |
| 704 | per_cpu_ptr(pptr, cpu), size); |
| 705 | off += size; |
| 706 | } |
| 707 | ret = 0; |
| 708 | out: |
| 709 | rcu_read_unlock(); |
| 710 | return ret; |
| 711 | } |
| 712 | |
| 713 | int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, |
| 714 | u64 map_flags) |
| 715 | { |
Sasha Levin | 6bbd9a0 | 2016-02-19 13:53:10 -0500 | [diff] [blame] | 716 | int ret; |
| 717 | |
| 718 | rcu_read_lock(); |
| 719 | ret = __htab_percpu_map_update_elem(map, key, value, map_flags, true); |
| 720 | rcu_read_unlock(); |
| 721 | |
| 722 | return ret; |
Alexei Starovoitov | 15a07b3 | 2016-02-01 22:39:55 -0800 | [diff] [blame] | 723 | } |
| 724 | |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 725 | static const struct bpf_map_ops htab_percpu_ops = { |
| 726 | .map_alloc = htab_map_alloc, |
| 727 | .map_free = htab_map_free, |
| 728 | .map_get_next_key = htab_map_get_next_key, |
| 729 | .map_lookup_elem = htab_percpu_map_lookup_elem, |
| 730 | .map_update_elem = htab_percpu_map_update_elem, |
| 731 | .map_delete_elem = htab_map_delete_elem, |
| 732 | }; |
| 733 | |
| 734 | static struct bpf_map_type_list htab_percpu_type __read_mostly = { |
| 735 | .ops = &htab_percpu_ops, |
| 736 | .type = BPF_MAP_TYPE_PERCPU_HASH, |
| 737 | }; |
| 738 | |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 739 | static int __init register_htab_map(void) |
| 740 | { |
Daniel Borkmann | a2c83ff | 2015-03-01 12:31:42 +0100 | [diff] [blame] | 741 | bpf_register_map_type(&htab_type); |
Alexei Starovoitov | 824bd0c | 2016-02-01 22:39:53 -0800 | [diff] [blame] | 742 | bpf_register_map_type(&htab_percpu_type); |
Alexei Starovoitov | 0f8e4bd | 2014-11-13 17:36:45 -0800 | [diff] [blame] | 743 | return 0; |
| 744 | } |
| 745 | late_initcall(register_htab_map); |