Commit c2f672fc authored Sep 20, 2016 by Florian Westphal Committed by Steffen Klassert Sep 21, 2016

xfrm: state lookup can be lockless



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>

parent 34a3d4b2

net/xfrm/xfrm_state.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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);