netdev - Re: [PATCH net-next] udp: intoduce udp_encap_needed static

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Date:	Fri, 13 Apr 2012 13:41:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	horms@...ge.net.au, dev@...nvswitch.org, netdev@...r.kernel.org,
	bcrl@...ck.org
Subject: Re: [PATCH net-next] udp: intoduce udp_encap_needed static_key

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 12 Apr 2012 11:05:28 +0200

> Most machines dont use UDP encapsulation (L2TP)
> 
> Adds a static_key so that udp_queue_rcv_skb() doesnt have to perform a
> test if L2TP never setup the encap_rcv on a socket.
> 
> Idea of this patch came after Simon Horman proposal to add a hook on TCP
> as well.
> 
> If static_key is not yet enabled, the fast path does a single JMP .
> 
> When static_key is enabled, JMP destination is patched to reach the real
> encap_type/encap_rcv logic, possibly adding cache misses.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied to net-next, thanks Eric.

Ban, please incorporate this scheme when you respin your
fixed ipv6 encap/l2tp patches.

Thanks.
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