// SPDX-License-Identifier: GPL-2.0

  /* Copyright (C) 2006-2019  B.A.T.M.A.N. contributors:

   *
   * Simon Wunderlich, Marek Lindner

   */

  #include "hash.h"

  #include "main.h"

  #include <linux/gfp.h>

  #include <linux/lockdep.h>
  #include <linux/slab.h>

  
  /* clears the hash */

  static void batadv_hash_init(struct batadv_hashtable *hash)

  {

  	u32 i;

  	for (i = 0; i < hash->size; i++) {

  		INIT_HLIST_HEAD(&hash->table[i]);

  		spin_lock_init(&hash->list_locks[i]);
  	}

  
  	atomic_set(&hash->generation, 0);

  }

  /**
   * batadv_hash_destroy() - Free only the hashtable and the hash itself
   * @hash: hash object to destroy
   */

  void batadv_hash_destroy(struct batadv_hashtable *hash)

  {

  	kfree(hash->list_locks);

  	kfree(hash->table);
  	kfree(hash);
  }

  /**
   * batadv_hash_new() - Allocates and clears the hashtable
   * @size: number of hash buckets to allocate
   *
   * Return: newly allocated hashtable, NULL on errors
   */

  struct batadv_hashtable *batadv_hash_new(u32 size)

  {

  	struct batadv_hashtable *hash;

  	hash = kmalloc(sizeof(*hash), GFP_ATOMIC);

  	if (!hash)
  		return NULL;

  	hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);

  	if (!hash->table)
  		goto free_hash;

  	hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
  					 GFP_ATOMIC);

  	if (!hash->list_locks)
  		goto free_table;

  	hash->size = size;

  	batadv_hash_init(hash);

  	return hash;

  
  free_table:
  	kfree(hash->table);
  free_hash:
  	kfree(hash);
  	return NULL;
  }

  /**
   * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
   * @hash: hash object to modify
   * @key: lockdep class key address
   */

  void batadv_hash_set_lock_class(struct batadv_hashtable *hash,

  				struct lock_class_key *key)
  {

  	u32 i;

  
  	for (i = 0; i < hash->size; i++)
  		lockdep_set_class(&hash->list_locks[i], key);
  }