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1da177e4 LT |
1 | /* |
2 | * ip_vs_est.c: simple rate estimator for IPVS | |
3 | * | |
1da177e4 LT |
4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
29c2026f HS |
11 | * Changes: Hans Schillstrom <hans.schillstrom@ericsson.com> |
12 | * Network name space (netns) aware. | |
13 | * Global data moved to netns i.e struct netns_ipvs | |
14 | * Affected data: est_list and est_lock. | |
15 | * estimation_timer() runs with timer per netns. | |
16 | * get_stats()) do the per cpu summing. | |
1da177e4 | 17 | */ |
9aada7ac HE |
18 | |
19 | #define KMSG_COMPONENT "IPVS" | |
20 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
21 | ||
1da177e4 | 22 | #include <linux/kernel.h> |
14c85021 | 23 | #include <linux/jiffies.h> |
1da177e4 | 24 | #include <linux/types.h> |
4ffd2e49 | 25 | #include <linux/interrupt.h> |
90754f8e | 26 | #include <linux/sysctl.h> |
3a14a313 | 27 | #include <linux/list.h> |
1da177e4 LT |
28 | |
29 | #include <net/ip_vs.h> | |
30 | ||
31 | /* | |
32 | This code is to estimate rate in a shorter interval (such as 8 | |
33 | seconds) for virtual services and real servers. For measure rate in a | |
34 | long interval, it is easy to implement a user level daemon which | |
35 | periodically reads those statistical counters and measure rate. | |
36 | ||
37 | Currently, the measurement is activated by slow timer handler. Hope | |
38 | this measurement will not introduce too much load. | |
39 | ||
40 | We measure rate during the last 8 seconds every 2 seconds: | |
41 | ||
42 | avgrate = avgrate*(1-W) + rate*W | |
43 | ||
44 | where W = 2^(-2) | |
45 | ||
46 | NOTES. | |
47 | ||
cd67cd5e | 48 | * Average bps is scaled by 2^5, while average pps and cps are scaled by 2^10. |
1da177e4 | 49 | |
cd67cd5e JA |
50 | * Netlink users can see 64-bit values but sockopt users are restricted |
51 | to 32-bit values for conns, packets, bps, cps and pps. | |
52 | ||
53 | * A lot of code is taken from net/core/gen_estimator.c | |
1da177e4 LT |
54 | */ |
55 | ||
56 | ||
b17fc996 HS |
57 | /* |
58 | * Make a summary from each cpu | |
59 | */ | |
cd67cd5e | 60 | static void ip_vs_read_cpu_stats(struct ip_vs_kstats *sum, |
b962abdc | 61 | struct ip_vs_cpu_stats __percpu *stats) |
b17fc996 HS |
62 | { |
63 | int i; | |
d1ee4fea | 64 | bool add = false; |
b17fc996 HS |
65 | |
66 | for_each_possible_cpu(i) { | |
67 | struct ip_vs_cpu_stats *s = per_cpu_ptr(stats, i); | |
68 | unsigned int start; | |
cd67cd5e JA |
69 | u64 conns, inpkts, outpkts, inbytes, outbytes; |
70 | ||
d1ee4fea | 71 | if (add) { |
b17fc996 | 72 | do { |
4a569c0c | 73 | start = u64_stats_fetch_begin(&s->syncp); |
cd67cd5e JA |
74 | conns = s->cnt.conns; |
75 | inpkts = s->cnt.inpkts; | |
76 | outpkts = s->cnt.outpkts; | |
77 | inbytes = s->cnt.inbytes; | |
78 | outbytes = s->cnt.outbytes; | |
4a569c0c | 79 | } while (u64_stats_fetch_retry(&s->syncp, start)); |
cd67cd5e JA |
80 | sum->conns += conns; |
81 | sum->inpkts += inpkts; | |
82 | sum->outpkts += outpkts; | |
b17fc996 HS |
83 | sum->inbytes += inbytes; |
84 | sum->outbytes += outbytes; | |
85 | } else { | |
d1ee4fea | 86 | add = true; |
b17fc996 | 87 | do { |
4a569c0c | 88 | start = u64_stats_fetch_begin(&s->syncp); |
cd67cd5e JA |
89 | sum->conns = s->cnt.conns; |
90 | sum->inpkts = s->cnt.inpkts; | |
91 | sum->outpkts = s->cnt.outpkts; | |
92 | sum->inbytes = s->cnt.inbytes; | |
93 | sum->outbytes = s->cnt.outbytes; | |
4a569c0c | 94 | } while (u64_stats_fetch_retry(&s->syncp, start)); |
b17fc996 HS |
95 | } |
96 | } | |
97 | } | |
98 | ||
99 | ||
1da177e4 LT |
100 | static void estimation_timer(unsigned long arg) |
101 | { | |
102 | struct ip_vs_estimator *e; | |
103 | struct ip_vs_stats *s; | |
cd67cd5e | 104 | u64 rate; |
29c2026f HS |
105 | struct net *net = (struct net *)arg; |
106 | struct netns_ipvs *ipvs; | |
1da177e4 | 107 | |
29c2026f HS |
108 | ipvs = net_ipvs(net); |
109 | spin_lock(&ipvs->est_lock); | |
110 | list_for_each_entry(e, &ipvs->est_list, list) { | |
3a14a313 | 111 | s = container_of(e, struct ip_vs_stats, est); |
1da177e4 LT |
112 | |
113 | spin_lock(&s->lock); | |
cd67cd5e | 114 | ip_vs_read_cpu_stats(&s->kstats, s->cpustats); |
1da177e4 LT |
115 | |
116 | /* scaled by 2^10, but divided 2 seconds */ | |
cd67cd5e JA |
117 | rate = (s->kstats.conns - e->last_conns) << 9; |
118 | e->last_conns = s->kstats.conns; | |
119 | e->cps += ((s64)rate - (s64)e->cps) >> 2; | |
120 | ||
121 | rate = (s->kstats.inpkts - e->last_inpkts) << 9; | |
122 | e->last_inpkts = s->kstats.inpkts; | |
123 | e->inpps += ((s64)rate - (s64)e->inpps) >> 2; | |
124 | ||
125 | rate = (s->kstats.outpkts - e->last_outpkts) << 9; | |
126 | e->last_outpkts = s->kstats.outpkts; | |
127 | e->outpps += ((s64)rate - (s64)e->outpps) >> 2; | |
128 | ||
129 | /* scaled by 2^5, but divided 2 seconds */ | |
130 | rate = (s->kstats.inbytes - e->last_inbytes) << 4; | |
131 | e->last_inbytes = s->kstats.inbytes; | |
132 | e->inbps += ((s64)rate - (s64)e->inbps) >> 2; | |
133 | ||
134 | rate = (s->kstats.outbytes - e->last_outbytes) << 4; | |
135 | e->last_outbytes = s->kstats.outbytes; | |
136 | e->outbps += ((s64)rate - (s64)e->outbps) >> 2; | |
1da177e4 LT |
137 | spin_unlock(&s->lock); |
138 | } | |
29c2026f HS |
139 | spin_unlock(&ipvs->est_lock); |
140 | mod_timer(&ipvs->est_timer, jiffies + 2*HZ); | |
1da177e4 LT |
141 | } |
142 | ||
0f34d54b | 143 | void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats) |
1da177e4 | 144 | { |
3a14a313 | 145 | struct ip_vs_estimator *est = &stats->est; |
1da177e4 | 146 | |
3a14a313 | 147 | INIT_LIST_HEAD(&est->list); |
1da177e4 | 148 | |
29c2026f HS |
149 | spin_lock_bh(&ipvs->est_lock); |
150 | list_add(&est->list, &ipvs->est_list); | |
151 | spin_unlock_bh(&ipvs->est_lock); | |
1da177e4 LT |
152 | } |
153 | ||
0f34d54b | 154 | void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats) |
1da177e4 | 155 | { |
3a14a313 SW |
156 | struct ip_vs_estimator *est = &stats->est; |
157 | ||
29c2026f | 158 | spin_lock_bh(&ipvs->est_lock); |
3a14a313 | 159 | list_del(&est->list); |
29c2026f | 160 | spin_unlock_bh(&ipvs->est_lock); |
1da177e4 LT |
161 | } |
162 | ||
163 | void ip_vs_zero_estimator(struct ip_vs_stats *stats) | |
164 | { | |
3a14a313 | 165 | struct ip_vs_estimator *est = &stats->est; |
cd67cd5e | 166 | struct ip_vs_kstats *k = &stats->kstats; |
55a3d4e1 JA |
167 | |
168 | /* reset counters, caller must hold the stats->lock lock */ | |
cd67cd5e JA |
169 | est->last_inbytes = k->inbytes; |
170 | est->last_outbytes = k->outbytes; | |
171 | est->last_conns = k->conns; | |
172 | est->last_inpkts = k->inpkts; | |
173 | est->last_outpkts = k->outpkts; | |
3a14a313 SW |
174 | est->cps = 0; |
175 | est->inpps = 0; | |
176 | est->outpps = 0; | |
177 | est->inbps = 0; | |
178 | est->outbps = 0; | |
1da177e4 | 179 | } |
a919cf4b | 180 | |
ea9f22cc | 181 | /* Get decoded rates */ |
cd67cd5e | 182 | void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats) |
ea9f22cc JA |
183 | { |
184 | struct ip_vs_estimator *e = &stats->est; | |
185 | ||
186 | dst->cps = (e->cps + 0x1FF) >> 10; | |
187 | dst->inpps = (e->inpps + 0x1FF) >> 10; | |
188 | dst->outpps = (e->outpps + 0x1FF) >> 10; | |
189 | dst->inbps = (e->inbps + 0xF) >> 5; | |
190 | dst->outbps = (e->outbps + 0xF) >> 5; | |
191 | } | |
192 | ||
503cf15a | 193 | int __net_init ip_vs_estimator_net_init(struct net *net) |
61b1ab45 | 194 | { |
29c2026f HS |
195 | struct netns_ipvs *ipvs = net_ipvs(net); |
196 | ||
29c2026f HS |
197 | INIT_LIST_HEAD(&ipvs->est_list); |
198 | spin_lock_init(&ipvs->est_lock); | |
199 | setup_timer(&ipvs->est_timer, estimation_timer, (unsigned long)net); | |
200 | mod_timer(&ipvs->est_timer, jiffies + 2 * HZ); | |
61b1ab45 HS |
201 | return 0; |
202 | } | |
203 | ||
503cf15a | 204 | void __net_exit ip_vs_estimator_net_cleanup(struct net *net) |
29c2026f HS |
205 | { |
206 | del_timer_sync(&net_ipvs(net)->est_timer); | |
207 | } |