netdev - Re: [PATCH 3/4] tun: Allow GSO using virtio_net

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Date:	Fri, 25 Jul 2008 09:54:18 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Max Krasnyansky <maxk@...lcomm.com>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, markmc@...hat.com
Subject: Re: [PATCH 3/4] tun: Allow GSO using virtio_net_hdr

On Friday 25 July 2008 00:20:44 Herbert Xu wrote:
> On Thu, Jun 26, 2008 at 12:30:37AM +1000, Rusty Russell wrote:
> > Add a IFF_VNET_HDR flag.  This uses the same ABI as virtio_net (ie.
> > prepending struct virtio_net_hdr to packets) to indicate GSO and checksum
> > information.
> >
> > Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
>
> I just noticed that we still allocate a linear skb even when GSO
> is enabled.  Please fix this by allocating page frags where
> necessary.  Otherwise GSO is only going to work before memory
> fragmentation sets in.
>
> IIRC I'd sent out a patch to the virt mailing list with code
> that did this.
>
> Thanks,

Hi Herbert,

   Thanks for the reminder.  I have this code in the virtio_net patches which 
Linus failed to pull.  Will just need to share it with the tun code (maybe a 
skb_alloc_large() helper).

Cheers,
Rusty.
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