Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 118 insertions, 0 deletions

diff --git a/net/ipv4/ipvs/ip_vs_rr.c b/net/ipv4/ipvs/ip_vs_rr.c
new file mode 100644
index 000000000000..b23bab231cab
--- /dev/null
+++ b/net/ipv4/ipvs/ip_vs_rr.c
@@ -0,0 +1,118 @@
+/*
+ * IPVS:        Round-Robin Scheduling module
+ *
+ * Version:     $Id: ip_vs_rr.c,v 1.9 2002/09/15 08:14:08 wensong Exp $
+ *
+ * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
+ *              Peter Kese <peter.kese@ijs.si>
+ *
+ *              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.
+ *
+ * Fixes/Changes:
+ *     Wensong Zhang            :     changed the ip_vs_rr_schedule to return dest
+ *     Julian Anastasov         :     fixed the NULL pointer access bug in debugging
+ *     Wensong Zhang            :     changed some comestics things for debugging
+ *     Wensong Zhang            :     changed for the d-linked destination list
+ *     Wensong Zhang            :     added the ip_vs_rr_update_svc
+ *     Wensong Zhang            :     added any dest with weight=0 is quiesced
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <net/ip_vs.h>
+
+
+static int ip_vs_rr_init_svc(struct ip_vs_service *svc)
+{
+        svc->sched_data = &svc->destinations;
+        return 0;
+}
+
+
+static int ip_vs_rr_done_svc(struct ip_vs_service *svc)
+{
+        return 0;
+}
+
+
+static int ip_vs_rr_update_svc(struct ip_vs_service *svc)
+{
+        svc->sched_data = &svc->destinations;
+        return 0;
+}
+
+
+/*
+ * Round-Robin Scheduling
+ */
+static struct ip_vs_dest *
+ip_vs_rr_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
+{
+        struct list_head *p, *q;
+        struct ip_vs_dest *dest;
+
+        IP_VS_DBG(6, "ip_vs_rr_schedule(): Scheduling...\n");
+
+        write_lock(&svc->sched_lock);
+        p = (struct list_head *)svc->sched_data;
+        p = p->next;
+        q = p;
+        do {
+                /* skip list head */
+                if (q == &svc->destinations) {
+                        q = q->next;
+                        continue;
+                }
+                
+                dest = list_entry(q, struct ip_vs_dest, n_list);
+                if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
+                    atomic_read(&dest->weight) > 0)
+                        /* HIT */
+                        goto out;
+                q = q->next;
+        } while (q != p);
+        write_unlock(&svc->sched_lock);
+        return NULL;
+
+  out:
+        svc->sched_data = q;
+        write_unlock(&svc->sched_lock);
+        IP_VS_DBG(6, "RR: server %u.%u.%u.%u:%u "
+                  "activeconns %d refcnt %d weight %d\n",
+                  NIPQUAD(dest->addr), ntohs(dest->port),
+                  atomic_read(&dest->activeconns),
+                  atomic_read(&dest->refcnt), atomic_read(&dest->weight));
+
+        return dest;
+}
+
+
+static struct ip_vs_scheduler ip_vs_rr_scheduler = {
+        .name =                 "rr",                   /* name */
+        .refcnt =               ATOMIC_INIT(0),
+        .module =               THIS_MODULE,
+        .init_service =         ip_vs_rr_init_svc,
+        .done_service =         ip_vs_rr_done_svc,
+        .update_service =       ip_vs_rr_update_svc,
+        .schedule =             ip_vs_rr_schedule,
+};
+
+static int __init ip_vs_rr_init(void)
+{
+        INIT_LIST_HEAD(&ip_vs_rr_scheduler.n_list);
+        return register_ip_vs_scheduler(&ip_vs_rr_scheduler);
+}
+
+static void __exit ip_vs_rr_cleanup(void)
+{
+        unregister_ip_vs_scheduler(&ip_vs_rr_scheduler);
+}
+
+module_init(ip_vs_rr_init);
+module_exit(ip_vs_rr_cleanup);
+MODULE_LICENSE("GPL");