bba54de5bd
Before now the schedulers needed access only to IP addresses and it was easy to get them from skb by using ip_vs_fill_iph_addr_only. New changes for the SH scheduler will need the protocol and ports which is difficult to get from skb for the IPv6 case. As we have all the data in the iph structure, to avoid the same slow lookups provide the iph to schedulers. Signed-off-by: Julian Anastasov <ja@ssi.bg> Acked-by: Hans Schillstrom <hans@schillstrom.com> Signed-off-by: Simon Horman <horms@verge.net.au>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
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* IPVS: Least-Connection Scheduling module
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*
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* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Changes:
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* Wensong Zhang : added the ip_vs_lc_update_svc
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* Wensong Zhang : added any dest with weight=0 is quiesced
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*
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*/
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#define KMSG_COMPONENT "IPVS"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <net/ip_vs.h>
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/*
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* Least Connection scheduling
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*/
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static struct ip_vs_dest *
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ip_vs_lc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
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struct ip_vs_iphdr *iph)
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{
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struct ip_vs_dest *dest, *least = NULL;
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unsigned int loh = 0, doh;
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IP_VS_DBG(6, "%s(): Scheduling...\n", __func__);
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/*
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* Simply select the server with the least number of
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* (activeconns<<5) + inactconns
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* Except whose weight is equal to zero.
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* If the weight is equal to zero, it means that the server is
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* quiesced, the existing connections to the server still get
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* served, but no new connection is assigned to the server.
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*/
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list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
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if ((dest->flags & IP_VS_DEST_F_OVERLOAD) ||
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atomic_read(&dest->weight) == 0)
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continue;
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doh = ip_vs_dest_conn_overhead(dest);
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if (!least || doh < loh) {
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least = dest;
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loh = doh;
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}
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}
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if (!least)
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ip_vs_scheduler_err(svc, "no destination available");
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else
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IP_VS_DBG_BUF(6, "LC: server %s:%u activeconns %d "
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"inactconns %d\n",
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IP_VS_DBG_ADDR(svc->af, &least->addr),
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ntohs(least->port),
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atomic_read(&least->activeconns),
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atomic_read(&least->inactconns));
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return least;
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}
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static struct ip_vs_scheduler ip_vs_lc_scheduler = {
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.name = "lc",
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.refcnt = ATOMIC_INIT(0),
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.module = THIS_MODULE,
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.n_list = LIST_HEAD_INIT(ip_vs_lc_scheduler.n_list),
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.schedule = ip_vs_lc_schedule,
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};
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static int __init ip_vs_lc_init(void)
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{
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return register_ip_vs_scheduler(&ip_vs_lc_scheduler) ;
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}
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static void __exit ip_vs_lc_cleanup(void)
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{
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unregister_ip_vs_scheduler(&ip_vs_lc_scheduler);
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synchronize_rcu();
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}
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module_init(ip_vs_lc_init);
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module_exit(ip_vs_lc_cleanup);
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MODULE_LICENSE("GPL");
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