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Date: Tue, 9 Sep 2014 22:55:42 +0300 (EEST)
From: Julian Anastasov <ja@....bg>
To: Kenny Mathis <kmathis@...kepoint.net>
cc: netdev@...r.kernel.org, Wensong Zhang <wensong@...ux-vs.org>,
Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH ipvs v2] ipvs: Add simple weighted failover scheduler
Hello,
On Tue, 9 Sep 2014, Kenny Mathis wrote:
> Please consider this patch for addition in 3.17
>
> Add simple weighted IPVS failover support to the Linux kernel. All
> other scheduling modules implement some form of load balancing, while
> this offers a simple failover solution. Connections are directed to
> the appropriate server based solely on highest weight value and server
> availability. Tested functionality with keepalived.
>
> Signed-off-by: Kenny Mathis <kmathis@...kepoint.net>
Looks good to me, thanks!
Acked-by: Julian Anastasov <ja@....bg>
Simon, you can apply it to ipvs-next if there are
no any objections.
> ---
> net/netfilter/ipvs/Kconfig | 10 ++++++
> net/netfilter/ipvs/Makefile | 1 +
> net/netfilter/ipvs/ip_vs_fo.c | 79 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 90 insertions(+)
> create mode 100644 net/netfilter/ipvs/ip_vs_fo.c
>
> diff --git a/net/netfilter/ipvs/Kconfig b/net/netfilter/ipvs/Kconfig
> index 0c3b167..3b6929d 100644
> --- a/net/netfilter/ipvs/Kconfig
> +++ b/net/netfilter/ipvs/Kconfig
> @@ -152,6 +152,16 @@ config IP_VS_WLC
> If you want to compile it in kernel, say Y. To compile it as a
> module, choose M here. If unsure, say N.
>
> +config IP_VS_FO
> + tristate "weighted failover scheduling"
> + ---help---
> + The weighted failover scheduling algorithm directs network
> + connections to the server with the highest weight that is
> + currently available.
> +
> + If you want to compile it in kernel, say Y. To compile it as a
> + module, choose M here. If unsure, say N.
> +
> config IP_VS_LBLC
> tristate "locality-based least-connection scheduling"
> ---help---
> diff --git a/net/netfilter/ipvs/Makefile b/net/netfilter/ipvs/Makefile
> index 34ee602..38b2723 100644
> --- a/net/netfilter/ipvs/Makefile
> +++ b/net/netfilter/ipvs/Makefile
> @@ -26,6 +26,7 @@ obj-$(CONFIG_IP_VS_RR) += ip_vs_rr.o
> obj-$(CONFIG_IP_VS_WRR) += ip_vs_wrr.o
> obj-$(CONFIG_IP_VS_LC) += ip_vs_lc.o
> obj-$(CONFIG_IP_VS_WLC) += ip_vs_wlc.o
> +obj-$(CONFIG_IP_VS_FO) += ip_vs_fo.o
> obj-$(CONFIG_IP_VS_LBLC) += ip_vs_lblc.o
> obj-$(CONFIG_IP_VS_LBLCR) += ip_vs_lblcr.o
> obj-$(CONFIG_IP_VS_DH) += ip_vs_dh.o
> diff --git a/net/netfilter/ipvs/ip_vs_fo.c b/net/netfilter/ipvs/ip_vs_fo.c
> new file mode 100644
> index 0000000..6a2647d
> --- /dev/null
> +++ b/net/netfilter/ipvs/ip_vs_fo.c
> @@ -0,0 +1,79 @@
> +/*
> + * IPVS: Weighted Fail Over module
> + *
> + * Authors: Kenny Mathis <kmathis@...kepoint.net>
> + *
> + * 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.
> + *
> + * 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(svc->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");
> --
> 1.7.9.5
Regards
--
Julian Anastasov <ja@....bg>
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