ipvs: Remove stray file left over from ipvs move

Commit cb7f6a7b ("IPVS: Move IPVS to
net/netfilter/ipvs") has left a stray file in the old location of ipvs.
Signed-off-by: NSven Wegener <sven.wegener@stealer.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ipvs/ip_vs_dh.c

-/*
- * IPVS:        Destination Hashing scheduling module
- *
- * Authors:     Wensong Zhang <wensong@gnuchina.org>
- *
- *              Inspired by the consistent hashing scheduler patch from
- *              Thomas Proell <proellt@gmx.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.
- *
- * Changes:
- *
- */
-
-/*
- * The dh algorithm is to select server by the hash key of destination IP
- * address. The pseudo code is as follows:
- *
- *       n <- servernode[dest_ip];
- *       if (n is dead) OR
- *          (n is overloaded) OR (n.weight <= 0) then
- *                 return NULL;
- *
- *       return n;
- *
- * Notes that servernode is a 256-bucket hash table that maps the hash
- * index derived from packet destination IP address to the current server
- * array. If the dh scheduler is used in cache cluster, it is good to
- * combine it with cache_bypass feature. When the statically assigned
- * server is dead or overloaded, the load balancer can bypass the cache
- * server and send requests to the original server directly.
- *
- */
-
-#include <linux/ip.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/skbuff.h>
-
-#include <net/ip_vs.h>
-
-
-/*
- *      IPVS DH bucket
- */
-struct ip_vs_dh_bucket {
-	struct ip_vs_dest       *dest;          /* real server (cache) */
-};
-
-/*
- *     for IPVS DH entry hash table
- */
-#ifndef CONFIG_IP_VS_DH_TAB_BITS
-#define CONFIG_IP_VS_DH_TAB_BITS        8
-#endif
-#define IP_VS_DH_TAB_BITS               CONFIG_IP_VS_DH_TAB_BITS
-#define IP_VS_DH_TAB_SIZE               (1 << IP_VS_DH_TAB_BITS)
-#define IP_VS_DH_TAB_MASK               (IP_VS_DH_TAB_SIZE - 1)
-
-
-/*
- *	Returns hash value for IPVS DH entry
- */
-static inline unsigned ip_vs_dh_hashkey(__be32 addr)
-{
-	return (ntohl(addr)*2654435761UL) & IP_VS_DH_TAB_MASK;
-}
-
-
-/*
- *      Get ip_vs_dest associated with supplied parameters.
- */
-static inline struct ip_vs_dest *
-ip_vs_dh_get(struct ip_vs_dh_bucket *tbl, __be32 addr)
-{
-	return (tbl[ip_vs_dh_hashkey(addr)]).dest;
-}
-
-
-/*
- *      Assign all the hash buckets of the specified table with the service.
- */
-static int
-ip_vs_dh_assign(struct ip_vs_dh_bucket *tbl, struct ip_vs_service *svc)
-{
-	int i;
-	struct ip_vs_dh_bucket *b;
-	struct list_head *p;
-	struct ip_vs_dest *dest;
-
-	b = tbl;
-	p = &svc->destinations;
-	for (i=0; i<IP_VS_DH_TAB_SIZE; i++) {
-		if (list_empty(p)) {
-			b->dest = NULL;
-		} else {
-			if (p == &svc->destinations)
-				p = p->next;
-
-			dest = list_entry(p, struct ip_vs_dest, n_list);
-			atomic_inc(&dest->refcnt);
-			b->dest = dest;
-
-			p = p->next;
-		}
-		b++;
-	}
-	return 0;
-}
-
-
-/*
- *      Flush all the hash buckets of the specified table.
- */
-static void ip_vs_dh_flush(struct ip_vs_dh_bucket *tbl)
-{
-	int i;
-	struct ip_vs_dh_bucket *b;
-
-	b = tbl;
-	for (i=0; i<IP_VS_DH_TAB_SIZE; i++) {
-		if (b->dest) {
-			atomic_dec(&b->dest->refcnt);
-			b->dest = NULL;
-		}
-		b++;
-	}
-}
-
-
-static int ip_vs_dh_init_svc(struct ip_vs_service *svc)
-{
-	struct ip_vs_dh_bucket *tbl;
-
-	/* allocate the DH table for this service */
-	tbl = kmalloc(sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE,
-		      GFP_ATOMIC);
-	if (tbl == NULL) {
-		IP_VS_ERR("ip_vs_dh_init_svc(): no memory\n");
-		return -ENOMEM;
-	}
-	svc->sched_data = tbl;
-	IP_VS_DBG(6, "DH hash table (memory=%Zdbytes) allocated for "
-		  "current service\n",
-		  sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE);
-
-	/* assign the hash buckets with the updated service */
-	ip_vs_dh_assign(tbl, svc);
-
-	return 0;
-}
-
-
-static int ip_vs_dh_done_svc(struct ip_vs_service *svc)
-{
-	struct ip_vs_dh_bucket *tbl = svc->sched_data;
-
-	/* got to clean up hash buckets here */
-	ip_vs_dh_flush(tbl);
-
-	/* release the table itself */
-	kfree(svc->sched_data);
-	IP_VS_DBG(6, "DH hash table (memory=%Zdbytes) released\n",
-		  sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE);
-
-	return 0;
-}
-
-
-static int ip_vs_dh_update_svc(struct ip_vs_service *svc)
-{
-	struct ip_vs_dh_bucket *tbl = svc->sched_data;
-
-	/* got to clean up hash buckets here */
-	ip_vs_dh_flush(tbl);
-
-	/* assign the hash buckets with the updated service */
-	ip_vs_dh_assign(tbl, svc);
-
-	return 0;
-}
-
-
-/*
- *      If the dest flags is set with IP_VS_DEST_F_OVERLOAD,
- *      consider that the server is overloaded here.
- */
-static inline int is_overloaded(struct ip_vs_dest *dest)
-{
-	return dest->flags & IP_VS_DEST_F_OVERLOAD;
-}
-
-
-/*
- *      Destination hashing scheduling
- */
-static struct ip_vs_dest *
-ip_vs_dh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
-{
-	struct ip_vs_dest *dest;
-	struct ip_vs_dh_bucket *tbl;
-	struct iphdr *iph = ip_hdr(skb);
-
-	IP_VS_DBG(6, "ip_vs_dh_schedule(): Scheduling...\n");
-
-	tbl = (struct ip_vs_dh_bucket *)svc->sched_data;
-	dest = ip_vs_dh_get(tbl, iph->daddr);
-	if (!dest
-	    || !(dest->flags & IP_VS_DEST_F_AVAILABLE)
-	    || atomic_read(&dest->weight) <= 0
-	    || is_overloaded(dest)) {
-		return NULL;
-	}
-
-	IP_VS_DBG(6, "DH: destination IP address %u.%u.%u.%u "
-		  "--> server %u.%u.%u.%u:%d\n",
-		  NIPQUAD(iph->daddr),
-		  NIPQUAD(dest->addr.ip),
-		  ntohs(dest->port));
-
-	return dest;
-}
-
-
-/*
- *      IPVS DH Scheduler structure
- */
-static struct ip_vs_scheduler ip_vs_dh_scheduler =
-{
-	.name =			"dh",
-	.refcnt =		ATOMIC_INIT(0),
-	.module =		THIS_MODULE,
-	.n_list =		LIST_HEAD_INIT(ip_vs_dh_scheduler.n_list),
-#ifdef CONFIG_IP_VS_IPV6
-	.supports_ipv6 =	0,
-#endif
-	.init_service =		ip_vs_dh_init_svc,
-	.done_service =		ip_vs_dh_done_svc,
-	.update_service =	ip_vs_dh_update_svc,
-	.schedule =		ip_vs_dh_schedule,
-};
-
-
-static int __init ip_vs_dh_init(void)
-{
-	return register_ip_vs_scheduler(&ip_vs_dh_scheduler);
-}
-
-
-static void __exit ip_vs_dh_cleanup(void)
-{
-	unregister_ip_vs_scheduler(&ip_vs_dh_scheduler);
-}
-
-
-module_init(ip_vs_dh_init);
-module_exit(ip_vs_dh_cleanup);
-MODULE_LICENSE("GPL");