netdev - Re: [PATCH net-next] {ipv4,xfrm}: Introduce xfrm_tunnel

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Date:	Tue, 27 Aug 2013 09:40:37 +0800
From:	Fan Du <fan.du@...driver.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	<saurabh.mohan@...tta.com>, <herbert@...dor.hengli.com.au>,
	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] {ipv4,xfrm}: Introduce xfrm_tunnel_notifier
 for xfrm tunnel mode callback

Hi, Steffen

Thanks for your attention :)

On 2013年08月26日 19:35, Steffen Klassert wrote:
> On Fri, Aug 23, 2013 at 02:47:04PM +0800, Fan Du wrote:
>> Some thoughts on IPv4 VTI implementation:
>>
>> The connection between VTI receiving part and xfrm tunnel mode input process
>> is hardly a "xfrm_tunnel", xfrm_tunnel is used in places where, e.g ipip/sit
>> and xfrm4_tunnel, acts like a true "tunnel" device.
>>
>> In addition, IMHO, VTI doesn't need vti_err to do something meaningful, as all
>> VTI needs is just a notifier to be called whenever xfrm_input ingress a packet
>> to update statistics.
>>
>> So this patch introduce xfrm_tunnel_notifier and meanwhile wipe out vti_erri
>> code.
>
> Btw. who calls vti_err()? I don't see a hook which would call the vti
> error handler. I'm still not absolutely sure whether we need it or not,
> but we should either remove it or add a hook to call it.

Yes, nobody calls vti_err. Maybe the vti_err comes from ipip_err as comments in
the file header said ip_vti.c cloned from ipip.c.

I have describe my statement in the reply for Dave's question. Please review.

-- 
浮沉随浪只记今朝笑

--fan
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