From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 4 Apr 2011 15:04:03 +0000 (+0200)
Subject: netfilter: get rid of atomic ops in fast path
X-Git-Tag: v3.0-rc1~377^2~311^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f5c6d4f665bb57a19a34ce1fb16cc708c04f219;p=pandora-kernel.git

netfilter: get rid of atomic ops in fast path

We currently use a percpu spinlock to 'protect' rule bytes/packets
counters, after various attempts to use RCU instead.

Lately we added a seqlock so that get_counters() can run without
blocking BH or 'writers'. But we really only need the seqcount in it.

Spinlock itself is only locked by the current/owner cpu, so we can
remove it completely.

This cleanups api, using correct 'writer' vs 'reader' semantic.

At replace time, the get_counters() call makes sure all cpus are done
using the old table.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
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