1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2006-2018 B.A.T.M.A.N. contributors:
3 *
4 * Simon Wunderlich, Marek Lindner
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include "hash.h"
20 #include "main.h"
21
22 #include <linux/gfp.h>
23 #include <linux/lockdep.h>
24 #include <linux/slab.h>
25
26 /* clears the hash */
batadv_hash_init(struct batadv_hashtable * hash)27 static void batadv_hash_init(struct batadv_hashtable *hash)
28 {
29 u32 i;
30
31 for (i = 0; i < hash->size; i++) {
32 INIT_HLIST_HEAD(&hash->table[i]);
33 spin_lock_init(&hash->list_locks[i]);
34 }
35 }
36
37 /**
38 * batadv_hash_destroy() - Free only the hashtable and the hash itself
39 * @hash: hash object to destroy
40 */
batadv_hash_destroy(struct batadv_hashtable * hash)41 void batadv_hash_destroy(struct batadv_hashtable *hash)
42 {
43 kfree(hash->list_locks);
44 kfree(hash->table);
45 kfree(hash);
46 }
47
48 /**
49 * batadv_hash_new() - Allocates and clears the hashtable
50 * @size: number of hash buckets to allocate
51 *
52 * Return: newly allocated hashtable, NULL on errors
53 */
batadv_hash_new(u32 size)54 struct batadv_hashtable *batadv_hash_new(u32 size)
55 {
56 struct batadv_hashtable *hash;
57
58 hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
59 if (!hash)
60 return NULL;
61
62 hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
63 if (!hash->table)
64 goto free_hash;
65
66 hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
67 GFP_ATOMIC);
68 if (!hash->list_locks)
69 goto free_table;
70
71 hash->size = size;
72 batadv_hash_init(hash);
73 return hash;
74
75 free_table:
76 kfree(hash->table);
77 free_hash:
78 kfree(hash);
79 return NULL;
80 }
81
82 /**
83 * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
84 * @hash: hash object to modify
85 * @key: lockdep class key address
86 */
batadv_hash_set_lock_class(struct batadv_hashtable * hash,struct lock_class_key * key)87 void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
88 struct lock_class_key *key)
89 {
90 u32 i;
91
92 for (i = 0; i < hash->size; i++)
93 lockdep_set_class(&hash->list_locks[i], key);
94 }
95
