| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
| 3 | * |
| 4 | * Simon Wunderlich, Marek Lindner |
| 5 | */ |
| 6 | |
| 7 | #include "hash.h" |
| 8 | #include "main.h" |
| 9 | |
| 10 | #include <linux/gfp.h> |
| 11 | #include <linux/lockdep.h> |
| 12 | #include <linux/slab.h> |
| 13 | |
| 14 | /* clears the hash */ |
| 15 | static void batadv_hash_init(struct batadv_hashtable *hash) |
| 16 | { |
| 17 | u32 i; |
| 18 | |
| 19 | for (i = 0; i < hash->size; i++) { |
| 20 | INIT_HLIST_HEAD(&hash->table[i]); |
| 21 | spin_lock_init(&hash->list_locks[i]); |
| 22 | } |
| 23 | |
| 24 | atomic_set(&hash->generation, 0); |
| 25 | } |
| 26 | |
| 27 | /** |
| 28 | * batadv_hash_destroy() - Free only the hashtable and the hash itself |
| 29 | * @hash: hash object to destroy |
| 30 | */ |
| 31 | void batadv_hash_destroy(struct batadv_hashtable *hash) |
| 32 | { |
| 33 | kfree(hash->list_locks); |
| 34 | kfree(hash->table); |
| 35 | kfree(hash); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * batadv_hash_new() - Allocates and clears the hashtable |
| 40 | * @size: number of hash buckets to allocate |
| 41 | * |
| 42 | * Return: newly allocated hashtable, NULL on errors |
| 43 | */ |
| 44 | struct batadv_hashtable *batadv_hash_new(u32 size) |
| 45 | { |
| 46 | struct batadv_hashtable *hash; |
| 47 | |
| 48 | hash = kmalloc(sizeof(*hash), GFP_ATOMIC); |
| 49 | if (!hash) |
| 50 | return NULL; |
| 51 | |
| 52 | hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC); |
| 53 | if (!hash->table) |
| 54 | goto free_hash; |
| 55 | |
| 56 | hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks), |
| 57 | GFP_ATOMIC); |
| 58 | if (!hash->list_locks) |
| 59 | goto free_table; |
| 60 | |
| 61 | hash->size = size; |
| 62 | batadv_hash_init(hash); |
| 63 | return hash; |
| 64 | |
| 65 | free_table: |
| 66 | kfree(hash->table); |
| 67 | free_hash: |
| 68 | kfree(hash); |
| 69 | return NULL; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks |
| 74 | * @hash: hash object to modify |
| 75 | * @key: lockdep class key address |
| 76 | */ |
| 77 | void batadv_hash_set_lock_class(struct batadv_hashtable *hash, |
| 78 | struct lock_class_key *key) |
| 79 | { |
| 80 | u32 i; |
| 81 | |
| 82 | for (i = 0; i < hash->size; i++) |
| 83 | lockdep_set_class(&hash->list_locks[i], key); |
| 84 | } |