netdev - Re: [PATCH] netfilter: don't disable BH again in BH disabled context

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Message-ID: <1282028127.2487.754.camel@edumazet-laptop>
Date:	Tue, 17 Aug 2010 08:55:27 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netfilter: don't disable BH again in BH disabled
 context

Le mardi 17 août 2010 à 14:41 +0800, Changli Gao a écrit :
> All the matches and targets of iptables, ip6tables are in BH disabled
> context, since xt_info_rdlock_bh() disables BH.
> 

Its a thing that might change in a future version. Not a hard fact.

You can probably change iptables to allow softirqs while processing
OUTPUT chains.

We had some attempts in the past to switch to RCU.

It failed at that time because of some RCU implementation details, but
with recent RCU changes, we might try again, and have a clean
implementation, allowing softirqs.

So your patch would need to be reverted.

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