From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 18 Jul 2011 14:08:27 +0000 (+0200)
Subject: netfilter: nfnetlink_queue: provide rcu enabled callbacks
X-Git-Tag: v3.1-rc1~316^2~70^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=84a797dd0b9f7130357b70577fcbda8e638c71a7;p=pandora-kernel.git

netfilter: nfnetlink_queue: provide rcu enabled callbacks

nenetlink_queue operations on SMP are not efficent if several queues are
used, because of nfnl_mutex contention when applications give packet
verdict.

Use new call_rcu field in struct nfnl_callback to advertize a callback
that is called under rcu_read_lock instead of nfnl_mutex.

On my 2x4x2 machine, I was able to reach 2.000.000 pps going through
user land returning NF_ACCEPT verdicts without losses, instead of less
than 500.000 pps before patch.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Florian Westphal <fw@strlen.de>
CC: Eric Leblond <eric@regit.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
---

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