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 */
15static 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 */
31void 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 */
44struct 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
65free_table:
66	kfree(hash->table);
67free_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 */
77void 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