/*
 * 	simple_lb.c
 *
 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
 * 
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include "crypto_lb.h"

static void simple_lb_rehash(struct crypto_lb *);
static struct crypto_device *simple_lb_find_device(struct crypto_lb *, struct crypto_session_initializer *);

struct crypto_lb simple_lb = 
{
	.name		= "simple_lb",
	.rehash		= simple_lb_rehash,
	.find_device	= simple_lb_find_device
};

static void simple_lb_rehash(struct crypto_lb *lb)
{
	BUG_ON(!lb->crypto_device_list);
	BUG_ON(!lb->crypto_device_lock);
}

static struct crypto_device *simple_lb_find_device(struct crypto_lb *lb, struct crypto_session_initializer *ci)
{
	struct crypto_device *dev, *__dev;
	int min = 0x7ffffff;

	__dev = NULL;
	list_for_each_entry(dev, lb->crypto_device_list, cdev_entry)
	{
		if (device_broken(dev))
			continue;
		if (!match_initializer(dev, ci))
			continue;

		if (atomic_read(&dev->refcnt) < min)
		{
			min = atomic_read(&dev->refcnt);
			__dev = dev;
		}
	}

	return __dev;
}

int __devinit simple_lb_init(void)
{
	dprintk(KERN_INFO "Registering simple crypto load balancer.\n");

	return crypto_lb_register(&simple_lb, 1, 1);
}

void __devexit simple_lb_fini(void)
{
	dprintk(KERN_INFO "Unregistering simple crypto load balancer.\n");

	crypto_lb_unregister(&simple_lb);
}

module_init(simple_lb_init);
module_exit(simple_lb_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <johnpol@xxxxxxxxxxx>");
MODULE_DESCRIPTION("Simple crypto load balancer.");