netdev - Re: skb_segment() questions

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Message-Id: <20090330.135748.264670066.davem@davemloft.net>
Date:	Mon, 30 Mar 2009 13:57:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	markmc@...hat.com
Cc:	herbert@...dor.apana.org.au, jamesclhuang@...il.com,
	netdev@...r.kernel.org
Subject: Re: skb_segment() questions

From: Mark McLoughlin <markmc@...hat.com>
Date: Mon, 30 Mar 2009 09:50:45 +0100

> On Sat, 2009-03-28 at 23:39 -0700, David Miller wrote:
> > From: Herbert Xu <herbert@...dor.apana.org.au>
> > Date: Sun, 29 Mar 2009 10:07:01 +0800
> > 
> > > gso: Fix support for linear packets
> > > 
> > > When GRO/frag_list support was added to GSO, I made an error
> > > which broke the support for segmenting linear GSO packets (GSO
> > > packets are normally non-linear in the payload).
> > > 
> > > These days most of these packets are constructed by the tun
> > > driver, which prefers to allocate linear memory if possible.
> > > This is fixed in the latest kernel, but for 2.6.29 and earlier
> > > it is still the norm.
> > > 
> > > Therefore this bug causes failures with GSO when used with tun
> > > in 2.6.29.
> > > 
> > > Reported-by: James Huang <jamesclhuang@...il.com>
> > > Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> > 
> > Applied, thanks.
> 
> This is needed in -stable too, fwiw. Fixes e.g. virtio guest->remote
> with 2.6.29 host:
> 
>   https://bugzilla.redhat.com/490266

I know, I'll queue it up.
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