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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: Wei Wang <weiwan@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Wang 2017-06-17 10:42:37 -07:00 committed by David S. Miller
parent 587fea7411
commit db916649b5
3 changed files with 1 additions and 49 deletions
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1
include/net/ip6_route.h
View File

@ -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);

3
net/ipv6/ip6_fib.c
View File

@ -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;

46
net/ipv6/route.c
View File

@ -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);
}