diff options
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_est.c')
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_est.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/net/netfilter/ipvs/ip_vs_est.c b/net/netfilter/ipvs/ip_vs_est.c new file mode 100644 index 000000000..ef0eb0a8d --- /dev/null +++ b/net/netfilter/ipvs/ip_vs_est.c @@ -0,0 +1,209 @@ +/* + * ip_vs_est.c: simple rate estimator for IPVS + * + * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> + * + * 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: Hans Schillstrom <hans.schillstrom@ericsson.com> + * Network name space (netns) aware. + * Global data moved to netns i.e struct netns_ipvs + * Affected data: est_list and est_lock. + * estimation_timer() runs with timer per netns. + * get_stats()) do the per cpu summing. + */ + +#define KMSG_COMPONENT "IPVS" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/kernel.h> +#include <linux/jiffies.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/sysctl.h> +#include <linux/list.h> + +#include <net/ip_vs.h> + +/* + This code is to estimate rate in a shorter interval (such as 8 + seconds) for virtual services and real servers. For measure rate in a + long interval, it is easy to implement a user level daemon which + periodically reads those statistical counters and measure rate. + + Currently, the measurement is activated by slow timer handler. Hope + this measurement will not introduce too much load. + + We measure rate during the last 8 seconds every 2 seconds: + + avgrate = avgrate*(1-W) + rate*W + + where W = 2^(-2) + + NOTES. + + * Average bps is scaled by 2^5, while average pps and cps are scaled by 2^10. + + * Netlink users can see 64-bit values but sockopt users are restricted + to 32-bit values for conns, packets, bps, cps and pps. + + * A lot of code is taken from net/core/gen_estimator.c + */ + + +/* + * Make a summary from each cpu + */ +static void ip_vs_read_cpu_stats(struct ip_vs_kstats *sum, + struct ip_vs_cpu_stats __percpu *stats) +{ + int i; + bool add = false; + + for_each_possible_cpu(i) { + struct ip_vs_cpu_stats *s = per_cpu_ptr(stats, i); + unsigned int start; + u64 conns, inpkts, outpkts, inbytes, outbytes; + + if (add) { + do { + start = u64_stats_fetch_begin(&s->syncp); + conns = s->cnt.conns; + inpkts = s->cnt.inpkts; + outpkts = s->cnt.outpkts; + inbytes = s->cnt.inbytes; + outbytes = s->cnt.outbytes; + } while (u64_stats_fetch_retry(&s->syncp, start)); + sum->conns += conns; + sum->inpkts += inpkts; + sum->outpkts += outpkts; + sum->inbytes += inbytes; + sum->outbytes += outbytes; + } else { + add = true; + do { + start = u64_stats_fetch_begin(&s->syncp); + sum->conns = s->cnt.conns; + sum->inpkts = s->cnt.inpkts; + sum->outpkts = s->cnt.outpkts; + sum->inbytes = s->cnt.inbytes; + sum->outbytes = s->cnt.outbytes; + } while (u64_stats_fetch_retry(&s->syncp, start)); + } + } +} + + +static void estimation_timer(unsigned long arg) +{ + struct ip_vs_estimator *e; + struct ip_vs_stats *s; + u64 rate; + struct net *net = (struct net *)arg; + struct netns_ipvs *ipvs; + + ipvs = net_ipvs(net); + spin_lock(&ipvs->est_lock); + list_for_each_entry(e, &ipvs->est_list, list) { + s = container_of(e, struct ip_vs_stats, est); + + spin_lock(&s->lock); + ip_vs_read_cpu_stats(&s->kstats, s->cpustats); + + /* scaled by 2^10, but divided 2 seconds */ + rate = (s->kstats.conns - e->last_conns) << 9; + e->last_conns = s->kstats.conns; + e->cps += ((s64)rate - (s64)e->cps) >> 2; + + rate = (s->kstats.inpkts - e->last_inpkts) << 9; + e->last_inpkts = s->kstats.inpkts; + e->inpps += ((s64)rate - (s64)e->inpps) >> 2; + + rate = (s->kstats.outpkts - e->last_outpkts) << 9; + e->last_outpkts = s->kstats.outpkts; + e->outpps += ((s64)rate - (s64)e->outpps) >> 2; + + /* scaled by 2^5, but divided 2 seconds */ + rate = (s->kstats.inbytes - e->last_inbytes) << 4; + e->last_inbytes = s->kstats.inbytes; + e->inbps += ((s64)rate - (s64)e->inbps) >> 2; + + rate = (s->kstats.outbytes - e->last_outbytes) << 4; + e->last_outbytes = s->kstats.outbytes; + e->outbps += ((s64)rate - (s64)e->outbps) >> 2; + spin_unlock(&s->lock); + } + spin_unlock(&ipvs->est_lock); + mod_timer(&ipvs->est_timer, jiffies + 2*HZ); +} + +void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats) +{ + struct netns_ipvs *ipvs = net_ipvs(net); + struct ip_vs_estimator *est = &stats->est; + + INIT_LIST_HEAD(&est->list); + + spin_lock_bh(&ipvs->est_lock); + list_add(&est->list, &ipvs->est_list); + spin_unlock_bh(&ipvs->est_lock); +} + +void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats) +{ + struct netns_ipvs *ipvs = net_ipvs(net); + struct ip_vs_estimator *est = &stats->est; + + spin_lock_bh(&ipvs->est_lock); + list_del(&est->list); + spin_unlock_bh(&ipvs->est_lock); +} + +void ip_vs_zero_estimator(struct ip_vs_stats *stats) +{ + struct ip_vs_estimator *est = &stats->est; + struct ip_vs_kstats *k = &stats->kstats; + + /* reset counters, caller must hold the stats->lock lock */ + est->last_inbytes = k->inbytes; + est->last_outbytes = k->outbytes; + est->last_conns = k->conns; + est->last_inpkts = k->inpkts; + est->last_outpkts = k->outpkts; + est->cps = 0; + est->inpps = 0; + est->outpps = 0; + est->inbps = 0; + est->outbps = 0; +} + +/* Get decoded rates */ +void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats) +{ + struct ip_vs_estimator *e = &stats->est; + + dst->cps = (e->cps + 0x1FF) >> 10; + dst->inpps = (e->inpps + 0x1FF) >> 10; + dst->outpps = (e->outpps + 0x1FF) >> 10; + dst->inbps = (e->inbps + 0xF) >> 5; + dst->outbps = (e->outbps + 0xF) >> 5; +} + +int __net_init ip_vs_estimator_net_init(struct net *net) +{ + struct netns_ipvs *ipvs = net_ipvs(net); + + INIT_LIST_HEAD(&ipvs->est_list); + spin_lock_init(&ipvs->est_lock); + setup_timer(&ipvs->est_timer, estimation_timer, (unsigned long)net); + mod_timer(&ipvs->est_timer, jiffies + 2 * HZ); + return 0; +} + +void __net_exit ip_vs_estimator_net_cleanup(struct net *net) +{ + del_timer_sync(&net_ipvs(net)->est_timer); +} |