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(v: &hash->generation, i: 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(objp: hash->list_locks); |
34 | kfree(objp: hash->table); |
35 | kfree(objp: 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(size: sizeof(*hash), GFP_ATOMIC); |
49 | if (!hash) |
50 | return NULL; |
51 | |
52 | hash->table = kmalloc_array(n: size, size: sizeof(*hash->table), GFP_ATOMIC); |
53 | if (!hash->table) |
54 | goto free_hash; |
55 | |
56 | hash->list_locks = kmalloc_array(n: size, 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(objp: hash->table); |
67 | free_hash: |
68 | kfree(objp: 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 | } |
85 | |