Commit db916649 authored by Wei Wang's avatar Wei Wang Committed by David S. Miller
Browse files

ipv6: get rid of icmp6 dst garbage collector 



icmp6 dst route is currently ref counted during creation and will be
freed by user during its call of dst_release(). So no need of a garbage
collector for it.
Remove all icmp6 dst garbage collector related code.

Signed-off-by: default avatarWei Wang <weiwan@google.com>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 587fea74

include/net/ip6_route.h

+0 −1
Original line number Diff line number Diff line
@@ -116,7 +116,6 @@ struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 
			    const struct in6_addr *saddr, int oif, int flags);



struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);

int icmp6_dst_gc(void);



void fib6_force_start_gc(struct net *net);

net/ipv6/ip6_fib.c

+1 −2
Original line number Diff line number Diff line
@@ -1822,8 +1822,7 @@ void fib6_run_gc(unsigned long expires, struct net *net, bool force) 
	}

	gc_args.timeout = expires ? (int)expires :

			  net->ipv6.sysctl.ip6_rt_gc_interval;



	gc_args.more = icmp6_dst_gc();

	gc_args.more = 0;



	fib6_clean_all(net, fib6_age, &gc_args);

	now = jiffies;

net/ipv6/route.c

+0 −46
Original line number Diff line number Diff line
@@ -1657,9 +1657,6 @@ out: 
	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);

}



static struct dst_entry *icmp6_dst_gc_list;

static DEFINE_SPINLOCK(icmp6_dst_lock);



struct dst_entry *icmp6_dst_alloc(struct net_device *dev,

				  struct flowi6 *fl6)

{
@@ -1697,48 +1694,6 @@ out: 
	return dst;

}



int icmp6_dst_gc(void)

{

	struct dst_entry *dst, **pprev;

	int more = 0;



	spin_lock_bh(&icmp6_dst_lock);

	pprev = &icmp6_dst_gc_list;



	while ((dst = *pprev) != NULL) {

		if (!atomic_read(&dst->__refcnt)) {

			*pprev = dst->next;

			dst_free(dst);

		} else {

			pprev = &dst->next;

			++more;

		}

	}



	spin_unlock_bh(&icmp6_dst_lock);



	return more;

}



static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),

			    void *arg)

{

	struct dst_entry *dst, **pprev;



	spin_lock_bh(&icmp6_dst_lock);

	pprev = &icmp6_dst_gc_list;

	while ((dst = *pprev) != NULL) {

		struct rt6_info *rt = (struct rt6_info *) dst;

		if (func(rt, arg)) {

			*pprev = dst->next;

			dst_free(dst);

		} else {

			pprev = &dst->next;

		}

	}

	spin_unlock_bh(&icmp6_dst_lock);

}



static int ip6_dst_gc(struct dst_ops *ops)

{

	struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
@@ -2856,7 +2811,6 @@ void rt6_ifdown(struct net *net, struct net_device *dev) 
	};



	fib6_clean_all(net, fib6_ifdown, &adn);

	icmp6_clean_all(fib6_ifdown, &adn);

	if (dev)

		rt6_uncached_list_flush_dev(net, dev);

}

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