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 */
batadv_hash_init(struct batadv_hashtable * 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 */
batadv_hash_destroy(struct batadv_hashtable * hash)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 */
batadv_hash_new(u32 size)44 struct batadv_hashtable *batadv_hash_new(u32 size)
45 {
46 struct batadv_hashtable *hash;
47
48 hash = kmalloc_obj(*hash, GFP_ATOMIC);
49 if (!hash)
50 return NULL;
51
52 hash->table = kmalloc_objs(*hash->table, size, GFP_ATOMIC);
53 if (!hash->table)
54 goto free_hash;
55
56 hash->list_locks = kmalloc_objs(*hash->list_locks, size, GFP_ATOMIC);
57 if (!hash->list_locks)
58 goto free_table;
59
60 hash->size = size;
61 batadv_hash_init(hash);
62 return hash;
63
64 free_table:
65 kfree(hash->table);
66 free_hash:
67 kfree(hash);
68 return NULL;
69 }
70
71 /**
72 * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
73 * @hash: hash object to modify
74 * @key: lockdep class key address
75 */
batadv_hash_set_lock_class(struct batadv_hashtable * hash,struct lock_class_key * key)76 void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
77 struct lock_class_key *key)
78 {
79 u32 i;
80
81 for (i = 0; i < hash->size; i++)
82 lockdep_set_class(&hash->list_locks[i], key);
83 }
84