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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>
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1 changed files with 2 additions and 17 deletions
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@ -447,23 +447,9 @@ static inline bool rt_is_expired(const struct rtable *rth)
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return rth->rt_genid != rt_genid(dev_net(rth->dst.dev));
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}
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/*
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* Perturbation of rt_genid by a small quantity [1..256]
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* Using 8 bits of shuffling ensure we can call rt_cache_invalidate()
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* many times (2^24) without giving recent rt_genid.
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* Jenkins hash is strong enough that litle changes of rt_genid are OK.
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*/
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static void rt_cache_invalidate(struct net *net)
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{
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unsigned char shuffle;
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get_random_bytes(&shuffle, sizeof(shuffle));
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atomic_add(shuffle + 1U, &net->ipv4.rt_genid);
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}
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void rt_cache_flush(struct net *net)
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{
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rt_cache_invalidate(net);
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atomic_inc(&net->ipv4.rt_genid);
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}
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static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
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@ -2520,8 +2506,7 @@ static __net_initdata struct pernet_operations sysctl_route_ops = {
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static __net_init int rt_genid_init(struct net *net)
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{
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get_random_bytes(&net->ipv4.rt_genid,
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sizeof(net->ipv4.rt_genid));
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atomic_set(&net->ipv4.rt_genid, 0);
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get_random_bytes(&net->ipv4.dev_addr_genid,
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sizeof(net->ipv4.dev_addr_genid));
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return 0;
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