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xfrm: state lookup can be lockless

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This is called from the packet input path, we get lock contention
if many cpus handle ipsec in parallel.

After recent rcu conversion it is safe to call __xfrm_state_lookup
without the spinlock.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2016-09-20 15:45:26 +02:00 committed by Steffen Klassert
parent 34a3d4b2d1
commit c2f672fc94
1 changed files with 2 additions and 2 deletions
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4
net/xfrm/xfrm_state.c
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@ -1431,9 +1431,9 @@ xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32
{
struct xfrm_state *x;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
rcu_read_lock();
x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
rcu_read_unlock();
return x;
}
EXPORT_SYMBOL(xfrm_state_lookup);