netdev - Re: [PATCH] netfilter: Remove skb_is_nonlinear check from nf_conntrack

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Date:	Fri, 14 May 2010 08:50:24 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netfilter: Remove skb_is_nonlinear check from
 nf_conntrack_sip

On Friday 2010-05-14 02:38, Jason Gunthorpe wrote:

>At least the XEN net front driver always produces non linear skbs,
>so the SIP module does nothing at all when used with that NIC.
>
>Copy the hacky technique for accessing SKB data from the ftp conntrack,
>better than nothing..
>
>Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> 
>+/* This is slow, but it's simple. --RR */
>+static char *sip_buffer;
>+static DEFINE_SPINLOCK(nf_sip_lock);
>+

skb_linearize seems simpler. (What about the cost?)
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