[IPV4]: The scheduled removal of multipath cached routing support.

With help from Chris Wedgwood.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 329 deletions

diff --git a/net/ipv4/multipath_wrandom.c b/net/ipv4/multipath_wrandom.c
deleted file mode 100644
index 57c503694539..000000000000
--- a/net/ipv4/multipath_wrandom.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- *              Weighted random policy for multipath.
- *
- *
- * Version:	$Id: multipath_wrandom.c,v 1.1.2.3 2004/09/22 07:51:40 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 <asm/system.h>
-#include <asm/uaccess.h>
-#include <linux/types.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 <linux/random.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_fib.h>
-#include <net/ip_mp_alg.h>
-
-#define MULTIPATH_STATE_SIZE 15
-
-struct multipath_candidate {
-	struct multipath_candidate	*next;
-	int				power;
-	struct rtable			*rt;
-};
-
-struct multipath_dest {
-	struct list_head	list;
-
-	const struct fib_nh	*nh_info;
-	__be32			netmask;
-	__be32			network;
-	unsigned char		prefixlen;
-
-	struct rcu_head		rcu;
-};
-
-struct multipath_bucket {
-	struct list_head	head;
-	spinlock_t		lock;
-};
-
-struct multipath_route {
-	struct list_head	list;
-
-	int			oif;
-	__be32			gw;
-	struct list_head	dests;
-
-	struct rcu_head		rcu;
-};
-
-/* state: primarily weight per route information */
-static struct multipath_bucket state[MULTIPATH_STATE_SIZE];
-
-static unsigned char __multipath_lookup_weight(const struct flowi *fl,
-					       const struct rtable *rt)
-{
-	const int state_idx = rt->idev->dev->ifindex % MULTIPATH_STATE_SIZE;
-	struct multipath_route *r;
-	struct multipath_route *target_route = NULL;
-	struct multipath_dest *d;
-	int weight = 1;
-
-	/* lookup the weight information for a certain route */
-	rcu_read_lock();
-
-	/* find state entry for gateway or add one if necessary */
-	list_for_each_entry_rcu(r, &state[state_idx].head, list) {
-		if (r->gw == rt->rt_gateway &&
-		    r->oif == rt->idev->dev->ifindex) {
-			target_route = r;
-			break;
-		}
-	}
-
-	if (!target_route) {
-		/* this should not happen... but we are prepared */
-		printk( KERN_CRIT"%s: missing state for gateway: %u and " \
-			"device %d\n", __FUNCTION__, rt->rt_gateway,
-			rt->idev->dev->ifindex);
-		goto out;
-	}
-
-	/* find state entry for destination */
-	list_for_each_entry_rcu(d, &target_route->dests, list) {
-		__be32 targetnetwork = fl->fl4_dst &
-			inet_make_mask(d->prefixlen);
-
-		if ((targetnetwork & d->netmask) == d->network) {
-			weight = d->nh_info->nh_weight;
-			goto out;
-		}
-	}
-
-out:
-	rcu_read_unlock();
-	return weight;
-}
-
-static void wrandom_init_state(void)
-{
-	int i;
-
-	for (i = 0; i < MULTIPATH_STATE_SIZE; ++i) {
-		INIT_LIST_HEAD(&state[i].head);
-		spin_lock_init(&state[i].lock);
-	}
-}
-
-static void wrandom_select_route(const struct flowi *flp,
-				 struct rtable *first,
-				 struct rtable **rp)
-{
-	struct rtable *rt;
-	struct rtable *decision;
-	struct multipath_candidate *first_mpc = NULL;
-	struct multipath_candidate *mpc, *last_mpc = NULL;
-	int power = 0;
-	int last_power;
-	int selector;
-	const size_t size_mpc = sizeof(struct multipath_candidate);
-
-	/* collect all candidates and identify their weights */
-	for (rt = rcu_dereference(first); rt;
-	     rt = rcu_dereference(rt->u.dst.rt_next)) {
-		if ((rt->u.dst.flags & DST_BALANCED) != 0 &&
-		    multipath_comparekeys(&rt->fl, flp)) {
-			struct multipath_candidate* mpc =
-				(struct multipath_candidate*)
-				kmalloc(size_mpc, GFP_ATOMIC);
-
-			if (!mpc)
-				return;
-
-			power += __multipath_lookup_weight(flp, rt) * 10000;
-
-			mpc->power = power;
-			mpc->rt = rt;
-			mpc->next = NULL;
-
-			if (!first_mpc)
-				first_mpc = mpc;
-			else
-				last_mpc->next = mpc;
-
-			last_mpc = mpc;
-		}
-	}
-
-	/* choose a weighted random candidate */
-	decision = first;
-	selector = random32() % power;
-	last_power = 0;
-
-	/* select candidate, adjust GC data and cleanup local state */
-	decision = first;
-	last_mpc = NULL;
-	for (mpc = first_mpc; mpc; mpc = mpc->next) {
-		mpc->rt->u.dst.lastuse = jiffies;
-		if (last_power <= selector && selector < mpc->power)
-			decision = mpc->rt;
-
-		last_power = mpc->power;
-		kfree(last_mpc);
-		last_mpc = mpc;
-	}
-
-	/* concurrent __multipath_flush may lead to !last_mpc */
-	kfree(last_mpc);
-
-	decision->u.dst.__use++;
-	*rp = decision;
-}
-
-static void wrandom_set_nhinfo(__be32 network,
-			       __be32 netmask,
-			       unsigned char prefixlen,
-			       const struct fib_nh *nh)
-{
-	const int state_idx = nh->nh_oif % MULTIPATH_STATE_SIZE;
-	struct multipath_route *r, *target_route = NULL;
-	struct multipath_dest *d, *target_dest = NULL;
-
-	/* store the weight information for a certain route */
-	spin_lock_bh(&state[state_idx].lock);
-
-	/* find state entry for gateway or add one if necessary */
-	list_for_each_entry_rcu(r, &state[state_idx].head, list) {
-		if (r->gw == nh->nh_gw && r->oif == nh->nh_oif) {
-			target_route = r;
-			break;
-		}
-	}
-
-	if (!target_route) {
-		const size_t size_rt = sizeof(struct multipath_route);
-		target_route = (struct multipath_route *)
-			kmalloc(size_rt, GFP_ATOMIC);
-
-		target_route->gw = nh->nh_gw;
-		target_route->oif = nh->nh_oif;
-		memset(&target_route->rcu, 0, sizeof(struct rcu_head));
-		INIT_LIST_HEAD(&target_route->dests);
-
-		list_add_rcu(&target_route->list, &state[state_idx].head);
-	}
-
-	/* find state entry for destination or add one if necessary */
-	list_for_each_entry_rcu(d, &target_route->dests, list) {
-		if (d->nh_info == nh) {
-			target_dest = d;
-			break;
-		}
-	}
-
-	if (!target_dest) {
-		const size_t size_dst = sizeof(struct multipath_dest);
-		target_dest = (struct multipath_dest*)
-			kmalloc(size_dst, GFP_ATOMIC);
-
-		target_dest->nh_info = nh;
-		target_dest->network = network;
-		target_dest->netmask = netmask;
-		target_dest->prefixlen = prefixlen;
-		memset(&target_dest->rcu, 0, sizeof(struct rcu_head));
-
-		list_add_rcu(&target_dest->list, &target_route->dests);
-	}
-	/* else: we already stored this info for another destination =>
-	 * we are finished
-	 */
-
-	spin_unlock_bh(&state[state_idx].lock);
-}
-
-static void __multipath_free(struct rcu_head *head)
-{
-	struct multipath_route *rt = container_of(head, struct multipath_route,
-						  rcu);
-	kfree(rt);
-}
-
-static void __multipath_free_dst(struct rcu_head *head)
-{
-	struct multipath_dest *dst = container_of(head,
-						  struct multipath_dest,
-						  rcu);
-	kfree(dst);
-}
-
-static void wrandom_flush(void)
-{
-	int i;
-
-	/* defere delete to all entries */
-	for (i = 0; i < MULTIPATH_STATE_SIZE; ++i) {
-		struct multipath_route *r;
-
-		spin_lock_bh(&state[i].lock);
-		list_for_each_entry_rcu(r, &state[i].head, list) {
-			struct multipath_dest *d;
-			list_for_each_entry_rcu(d, &r->dests, list) {
-				list_del_rcu(&d->list);
-				call_rcu(&d->rcu,
-					 __multipath_free_dst);
-			}
-			list_del_rcu(&r->list);
-			call_rcu(&r->rcu,
-				 __multipath_free);
-		}
-
-		spin_unlock_bh(&state[i].lock);
-	}
-}
-
-static struct ip_mp_alg_ops wrandom_ops = {
-	.mp_alg_select_route	=	wrandom_select_route,
-	.mp_alg_flush		=	wrandom_flush,
-	.mp_alg_set_nhinfo	=	wrandom_set_nhinfo,
-};
-
-static int __init wrandom_init(void)
-{
-	wrandom_init_state();
-
-	return multipath_alg_register(&wrandom_ops, IP_MP_ALG_WRANDOM);
-}
-
-static void __exit wrandom_exit(void)
-{
-	multipath_alg_unregister(&wrandom_ops, IP_MP_ALG_WRANDOM);
-}
-
-module_init(wrandom_init);
-module_exit(wrandom_exit);
-MODULE_LICENSE("GPL");