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1 | /* |
2 | * IPVS: Weighted Fail Over module | |
3 | * | |
4 | * Authors: Kenny Mathis <kmathis@chokepoint.net> | |
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 | * | |
11 | * Changes: | |
12 | * Kenny Mathis : added initial functionality based on weight | |
13 | * | |
14 | */ | |
15 | ||
16 | #define KMSG_COMPONENT "IPVS" | |
17 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/kernel.h> | |
21 | ||
22 | #include <net/ip_vs.h> | |
23 | ||
24 | /* Weighted Fail Over Module */ | |
25 | static struct ip_vs_dest * | |
26 | ip_vs_fo_schedule(struct ip_vs_service *svc, const struct sk_buff *skb, | |
27 | struct ip_vs_iphdr *iph) | |
28 | { | |
29 | struct ip_vs_dest *dest, *hweight = NULL; | |
30 | int hw = 0; /* Track highest weight */ | |
31 | ||
32 | IP_VS_DBG(6, "ip_vs_fo_schedule(): Scheduling...\n"); | |
33 | ||
34 | /* Basic failover functionality | |
35 | * Find virtual server with highest weight and send it traffic | |
36 | */ | |
37 | list_for_each_entry_rcu(dest, &svc->destinations, n_list) { | |
38 | if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) && | |
39 | atomic_read(&dest->weight) > hw) { | |
40 | hweight = dest; | |
41 | hw = atomic_read(&dest->weight); | |
42 | } | |
43 | } | |
44 | ||
45 | if (hweight) { | |
46 | IP_VS_DBG_BUF(6, "FO: server %s:%u activeconns %d weight %d\n", | |
4d316f3f | 47 | IP_VS_DBG_ADDR(hweight->af, &hweight->addr), |
616a9be2 KM |
48 | ntohs(hweight->port), |
49 | atomic_read(&hweight->activeconns), | |
50 | atomic_read(&hweight->weight)); | |
51 | return hweight; | |
52 | } | |
53 | ||
54 | ip_vs_scheduler_err(svc, "no destination available"); | |
55 | return NULL; | |
56 | } | |
57 | ||
58 | static struct ip_vs_scheduler ip_vs_fo_scheduler = { | |
59 | .name = "fo", | |
60 | .refcnt = ATOMIC_INIT(0), | |
61 | .module = THIS_MODULE, | |
62 | .n_list = LIST_HEAD_INIT(ip_vs_fo_scheduler.n_list), | |
63 | .schedule = ip_vs_fo_schedule, | |
64 | }; | |
65 | ||
66 | static int __init ip_vs_fo_init(void) | |
67 | { | |
68 | return register_ip_vs_scheduler(&ip_vs_fo_scheduler); | |
69 | } | |
70 | ||
71 | static void __exit ip_vs_fo_cleanup(void) | |
72 | { | |
73 | unregister_ip_vs_scheduler(&ip_vs_fo_scheduler); | |
74 | synchronize_rcu(); | |
75 | } | |
76 | ||
77 | module_init(ip_vs_fo_init); | |
78 | module_exit(ip_vs_fo_cleanup); | |
79 | MODULE_LICENSE("GPL"); |