tree 6d093dba184228f689873b7171d63933f0676e0d
parent 6b75e3e8d664a9a1b99d31a7f4976ae70d1d090a
author Eric Dumazet <eric.dumazet@gmail.com> 1310998107 +0200
committer Patrick McHardy <kaber@trash.net> 1310998107 +0200

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>