]>
Commit | Line | Data |
---|---|---|
7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
68e039f9 | 2 | /* Copyright (C) 2006-2020 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Simon Wunderlich, Marek Lindner | |
c6c8fea2 SE |
5 | */ |
6 | ||
c6c8fea2 | 7 | #include "hash.h" |
1e2c2a4f SE |
8 | #include "main.h" |
9 | ||
b92b94ac | 10 | #include <linux/gfp.h> |
1e2c2a4f SE |
11 | #include <linux/lockdep.h> |
12 | #include <linux/slab.h> | |
c6c8fea2 SE |
13 | |
14 | /* clears the hash */ | |
5bf74e9c | 15 | static void batadv_hash_init(struct batadv_hashtable *hash) |
c6c8fea2 | 16 | { |
6b5e971a | 17 | u32 i; |
c6c8fea2 | 18 | |
cb4cca71 | 19 | for (i = 0; i < hash->size; i++) { |
c6c8fea2 | 20 | INIT_HLIST_HEAD(&hash->table[i]); |
fb778ea1 ML |
21 | spin_lock_init(&hash->list_locks[i]); |
22 | } | |
05abd7bc SE |
23 | |
24 | atomic_set(&hash->generation, 0); | |
c6c8fea2 SE |
25 | } |
26 | ||
ff15c27c SE |
27 | /** |
28 | * batadv_hash_destroy() - Free only the hashtable and the hash itself | |
29 | * @hash: hash object to destroy | |
30 | */ | |
5bf74e9c | 31 | void batadv_hash_destroy(struct batadv_hashtable *hash) |
c6c8fea2 | 32 | { |
fb778ea1 | 33 | kfree(hash->list_locks); |
c6c8fea2 SE |
34 | kfree(hash->table); |
35 | kfree(hash); | |
36 | } | |
37 | ||
ff15c27c SE |
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 | */ | |
6b5e971a | 44 | struct batadv_hashtable *batadv_hash_new(u32 size) |
c6c8fea2 | 45 | { |
5bf74e9c | 46 | struct batadv_hashtable *hash; |
c6c8fea2 | 47 | |
704509b8 | 48 | hash = kmalloc(sizeof(*hash), GFP_ATOMIC); |
c6c8fea2 SE |
49 | if (!hash) |
50 | return NULL; | |
51 | ||
0185dda6 | 52 | hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC); |
fb778ea1 ML |
53 | if (!hash->table) |
54 | goto free_hash; | |
c6c8fea2 | 55 | |
0185dda6 AQ |
56 | hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks), |
57 | GFP_ATOMIC); | |
fb778ea1 ML |
58 | if (!hash->list_locks) |
59 | goto free_table; | |
c6c8fea2 | 60 | |
fb778ea1 | 61 | hash->size = size; |
7f9f02cb | 62 | batadv_hash_init(hash); |
c6c8fea2 | 63 | return hash; |
fb778ea1 ML |
64 | |
65 | free_table: | |
66 | kfree(hash->table); | |
67 | free_hash: | |
68 | kfree(hash); | |
69 | return NULL; | |
70 | } | |
5d52dad2 | 71 | |
ff15c27c SE |
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 | */ | |
5bf74e9c | 77 | void batadv_hash_set_lock_class(struct batadv_hashtable *hash, |
5d52dad2 SE |
78 | struct lock_class_key *key) |
79 | { | |
6b5e971a | 80 | u32 i; |
5d52dad2 SE |
81 | |
82 | for (i = 0; i < hash->size; i++) | |
83 | lockdep_set_class(&hash->list_locks[i], key); | |
84 | } |