hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Eric Dumazet 2012-09-07 22:27:11 +02:00 committed by David S. Miller
parent bd877e4891
commit ba8bd0ea98
1 changed files with 2 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
net/ipv4/route.c
View File

@ -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)); 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) 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, 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) static __net_init int rt_genid_init(struct net *net)
{ {
get_random_bytes(&net->ipv4.rt_genid, atomic_set(&net->ipv4.rt_genid, 0);
sizeof(net->ipv4.rt_genid));
get_random_bytes(&net->ipv4.dev_addr_genid, get_random_bytes(&net->ipv4.dev_addr_genid,
sizeof(net->ipv4.dev_addr_genid)); sizeof(net->ipv4.dev_addr_genid));
return 0; return 0;