netdev - Re: [patch 0/6] netfilter: ctnetlink allocation improvement

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Message-ID: <20090317090756.GF18729@Chamillionaire.breakpoint.cc>
Date:	Tue, 17 Mar 2009 10:07:56 +0100
From:	Florian Westphal <fw@...len.de>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Holger Eitzenberger <holger@...zenberger.org>,
	David Miller <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [patch 0/6] netfilter: ctnetlink allocation improvement

Patrick McHardy <kaber@...sh.net> wrote:
>> +	l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
>> +	len += l3proto->nla_size;
>> +	nf_ct_l3proto_put(l3proto);
>> +
>> +	l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
>> +	len += l4proto->nla_size;
>> +	nf_ct_l4proto_put(l4proto);
>> +
>> +	return alloc_skb(len, gfp);
>
> Its preferrable not to use module reference counting during packet
> processing, the protocols can be accessed safely using RCU. I thought
> I had fixed all those areas, but I now notice that ctnetlink is full
> of similar spots and takes and drops module references quite
> excessively. So just leave it as it is I guess, this should be fully
> fixed anyways.

I'll look into converting all those spots to RCU.

Thanks, Florian
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