Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
119 lines
3 KiB
C
119 lines
3 KiB
C
/*
|
|
* IPVS: Round-Robin Scheduling module
|
|
*
|
|
* Version: $Id: ip_vs_rr.c,v 1.9 2002/09/15 08:14:08 wensong Exp $
|
|
*
|
|
* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
|
|
* Peter Kese <peter.kese@ijs.si>
|
|
*
|
|
* 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.
|
|
*
|
|
* Fixes/Changes:
|
|
* Wensong Zhang : changed the ip_vs_rr_schedule to return dest
|
|
* Julian Anastasov : fixed the NULL pointer access bug in debugging
|
|
* Wensong Zhang : changed some comestics things for debugging
|
|
* Wensong Zhang : changed for the d-linked destination list
|
|
* Wensong Zhang : added the ip_vs_rr_update_svc
|
|
* Wensong Zhang : added any dest with weight=0 is quiesced
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <net/ip_vs.h>
|
|
|
|
|
|
static int ip_vs_rr_init_svc(struct ip_vs_service *svc)
|
|
{
|
|
svc->sched_data = &svc->destinations;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int ip_vs_rr_done_svc(struct ip_vs_service *svc)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int ip_vs_rr_update_svc(struct ip_vs_service *svc)
|
|
{
|
|
svc->sched_data = &svc->destinations;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Round-Robin Scheduling
|
|
*/
|
|
static struct ip_vs_dest *
|
|
ip_vs_rr_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
|
|
{
|
|
struct list_head *p, *q;
|
|
struct ip_vs_dest *dest;
|
|
|
|
IP_VS_DBG(6, "ip_vs_rr_schedule(): Scheduling...\n");
|
|
|
|
write_lock(&svc->sched_lock);
|
|
p = (struct list_head *)svc->sched_data;
|
|
p = p->next;
|
|
q = p;
|
|
do {
|
|
/* skip list head */
|
|
if (q == &svc->destinations) {
|
|
q = q->next;
|
|
continue;
|
|
}
|
|
|
|
dest = list_entry(q, struct ip_vs_dest, n_list);
|
|
if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
|
|
atomic_read(&dest->weight) > 0)
|
|
/* HIT */
|
|
goto out;
|
|
q = q->next;
|
|
} while (q != p);
|
|
write_unlock(&svc->sched_lock);
|
|
return NULL;
|
|
|
|
out:
|
|
svc->sched_data = q;
|
|
write_unlock(&svc->sched_lock);
|
|
IP_VS_DBG(6, "RR: server %u.%u.%u.%u:%u "
|
|
"activeconns %d refcnt %d weight %d\n",
|
|
NIPQUAD(dest->addr), ntohs(dest->port),
|
|
atomic_read(&dest->activeconns),
|
|
atomic_read(&dest->refcnt), atomic_read(&dest->weight));
|
|
|
|
return dest;
|
|
}
|
|
|
|
|
|
static struct ip_vs_scheduler ip_vs_rr_scheduler = {
|
|
.name = "rr", /* name */
|
|
.refcnt = ATOMIC_INIT(0),
|
|
.module = THIS_MODULE,
|
|
.init_service = ip_vs_rr_init_svc,
|
|
.done_service = ip_vs_rr_done_svc,
|
|
.update_service = ip_vs_rr_update_svc,
|
|
.schedule = ip_vs_rr_schedule,
|
|
};
|
|
|
|
static int __init ip_vs_rr_init(void)
|
|
{
|
|
INIT_LIST_HEAD(&ip_vs_rr_scheduler.n_list);
|
|
return register_ip_vs_scheduler(&ip_vs_rr_scheduler);
|
|
}
|
|
|
|
static void __exit ip_vs_rr_cleanup(void)
|
|
{
|
|
unregister_ip_vs_scheduler(&ip_vs_rr_scheduler);
|
|
}
|
|
|
|
module_init(ip_vs_rr_init);
|
|
module_exit(ip_vs_rr_cleanup);
|
|
MODULE_LICENSE("GPL");
|