This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / net / ipv4 / multipath_rr.c

diff --git a/net/ipv4/multipath_rr.c b/net/ipv4/multipath_rr.c
new file mode 100644 (file)
index 0000000..b6cd287
--- /dev/null
+++ b/net/ipv4/multipath_rr.c
@@ -0,0 +1,97 @@
+/*
+ *              Round robin policy for multipath.
+ *
+ *
+ * Version:    $Id: multipath_rr.c,v 1.1.2.2 2004/09/16 07:42:34 elueck Exp $
+ *
+ * Authors:    Einar Lueck <elueck@de.ibm.com><lkml@einar-lueck.de>
+ *
+ *             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.
+ */
+
+#include <linux/config.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/igmp.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <linux/mroute.h>
+#include <linux/init.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/raw.h>
+#include <linux/notifier.h>
+#include <linux/if_arp.h>
+#include <linux/netfilter_ipv4.h>
+#include <net/ipip.h>
+#include <net/checksum.h>
+#include <net/ip_mp_alg.h>
+
+static void rr_select_route(const struct flowi *flp,
+                           struct rtable *first, struct rtable **rp)
+{
+       struct rtable *nh, *result, *min_use_cand = NULL;
+       int min_use = -1;
+
+       /* 1. make sure all alt. nexthops have the same GC related data
+        * 2. determine the new candidate to be returned
+        */
+       result = NULL;
+       for (nh = rcu_dereference(first); nh;
+            nh = rcu_dereference(nh->u.rt_next)) {
+               if ((nh->u.dst.flags & DST_BALANCED) != 0 &&
+                   multipath_comparekeys(&nh->fl, flp)) {
+                       nh->u.dst.lastuse = jiffies;
+
+                       if (min_use == -1 || nh->u.dst.__use < min_use) {
+                               min_use = nh->u.dst.__use;
+                               min_use_cand = nh;
+                       }
+               }
+       }
+       result = min_use_cand;
+       if (!result)
+               result = first;
+
+       result->u.dst.__use++;
+       *rp = result;
+}
+
+static struct ip_mp_alg_ops rr_ops = {
+       .mp_alg_select_route    =       rr_select_route,
+};
+
+static int __init rr_init(void)
+{
+       return multipath_alg_register(&rr_ops, IP_MP_ALG_RR);
+}
+
+static void __exit rr_exit(void)
+{
+       multipath_alg_unregister(&rr_ops, IP_MP_ALG_RR);
+}
+
+module_init(rr_init);
+module_exit(rr_exit);
+MODULE_LICENSE("GPL");