diff options
| author | Eric Dumazet <edumazet@google.com> | 2012-09-07 22:27:11 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-09-07 17:23:17 -0400 |
| commit | ba8bd0ea982427258ab86144ac5fd1a9d7763a90 (patch) | |
| tree | a5efc09561753833ed4a77b04d12b1ee60b24116 /net | |
| parent | bd877e489126b2214f971ae8ef7bd17b48a94a7b (diff) | |
| download | linux-ba8bd0ea982427258ab86144ac5fd1a9d7763a90.tar.bz2 | |
net: rt_cache_flush() cleanup
We dont use jhash anymore since route cache removal,
so we can get rid of get_random_bytes() calls for rt_genid
changes.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/route.c | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index ab1e7c7c38fc..d39edf16d607 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -447,23 +447,9 @@ static inline bool rt_is_expired(const struct rtable *rth) return rth->rt_genid != rt_genid(dev_net(rth->dst.dev)); } -/* - * Perturbation of rt_genid by a small quantity [1..256] - * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() - * many times (2^24) without giving recent rt_genid. - * Jenkins hash is strong enough that litle changes of rt_genid are OK. - */ -static void rt_cache_invalidate(struct net *net) -{ - unsigned char shuffle; - - get_random_bytes(&shuffle, sizeof(shuffle)); - atomic_add(shuffle + 1U, &net->ipv4.rt_genid); -} - void rt_cache_flush(struct net *net) { - rt_cache_invalidate(net); + atomic_inc(&net->ipv4.rt_genid); } static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, @@ -2520,8 +2506,7 @@ static __net_initdata struct pernet_operations sysctl_route_ops = { static __net_init int rt_genid_init(struct net *net) { - get_random_bytes(&net->ipv4.rt_genid, - sizeof(net->ipv4.rt_genid)); + atomic_set(&net->ipv4.rt_genid, 0); get_random_bytes(&net->ipv4.dev_addr_genid, sizeof(net->ipv4.dev_addr_genid)); return 0; |