mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* IPVS: Weighted Fail Over module
|
|
*
|
|
* Authors: Kenny Mathis <kmathis@chokepoint.net>
|
|
*
|
|
* Changes:
|
|
* Kenny Mathis : added initial functionality based on weight
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "IPVS"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <net/ip_vs.h>
|
|
|
|
/* Weighted Fail Over Module */
|
|
static struct ip_vs_dest *
|
|
ip_vs_fo_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
|
|
struct ip_vs_iphdr *iph)
|
|
{
|
|
struct ip_vs_dest *dest, *hweight = NULL;
|
|
int hw = 0; /* Track highest weight */
|
|
|
|
IP_VS_DBG(6, "ip_vs_fo_schedule(): Scheduling...\n");
|
|
|
|
/* Basic failover functionality
|
|
* Find virtual server with highest weight and send it traffic
|
|
*/
|
|
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
|
|
if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
|
|
atomic_read(&dest->weight) > hw) {
|
|
hweight = dest;
|
|
hw = atomic_read(&dest->weight);
|
|
}
|
|
}
|
|
|
|
if (hweight) {
|
|
IP_VS_DBG_BUF(6, "FO: server %s:%u activeconns %d weight %d\n",
|
|
IP_VS_DBG_ADDR(hweight->af, &hweight->addr),
|
|
ntohs(hweight->port),
|
|
atomic_read(&hweight->activeconns),
|
|
atomic_read(&hweight->weight));
|
|
return hweight;
|
|
}
|
|
|
|
ip_vs_scheduler_err(svc, "no destination available");
|
|
return NULL;
|
|
}
|
|
|
|
static struct ip_vs_scheduler ip_vs_fo_scheduler = {
|
|
.name = "fo",
|
|
.refcnt = ATOMIC_INIT(0),
|
|
.module = THIS_MODULE,
|
|
.n_list = LIST_HEAD_INIT(ip_vs_fo_scheduler.n_list),
|
|
.schedule = ip_vs_fo_schedule,
|
|
};
|
|
|
|
static int __init ip_vs_fo_init(void)
|
|
{
|
|
return register_ip_vs_scheduler(&ip_vs_fo_scheduler);
|
|
}
|
|
|
|
static void __exit ip_vs_fo_cleanup(void)
|
|
{
|
|
unregister_ip_vs_scheduler(&ip_vs_fo_scheduler);
|
|
synchronize_rcu();
|
|
}
|
|
|
|
module_init(ip_vs_fo_init);
|
|
module_exit(ip_vs_fo_cleanup);
|
|
MODULE_LICENSE("GPL");
|