linux-kernel - Re: [PATCH] virtio-net: put virtio net header inline with data

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Message-ID: <20130709051824.GA3234@redhat.com>
Date:	Tue, 9 Jul 2013 08:18:24 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>,
	Cong Wang <amwang@...hat.com>, Amos Kong <akong@...hat.com>,
	Dave Jones <davej@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio-net: put virtio net header inline with data

On Tue, Jul 09, 2013 at 11:46:23AM +0930, Rusty Russell wrote:
> "Michael S. Tsirkin" <mst@...hat.com> writes:
> > For small packets we can simplify xmit processing
> > by linearizing buffers with the header:
> > most packets seem to have enough head room
> > we can use for this purpose.
> > Since existing hypervisors require that header
> > is the first s/g element, we need a feature bit
> > for this.
> >
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >
> > Note: this needs to be applied on top of patch
> > defining VIRTIO_F_ANY_LAYOUT - bit to be
> > selected by Rusty.
> >
> > The following patch should work for any definition of
> > VIRTIO_F_ANY_LAYOUT - I used bit 31 for testing.
> > Rusty, could you please pick a valid bit for VIRTIO_F_ANY_LAYOUT
> > and squeeze this patch into 3.11?
> 
> Sorry, it's too late.
> 
> First, I've been a bit lax in sending patches via DaveM, and this is
> definitely his territory (ie. more net than virtio).

Let's do this: I'll send a patch series, you ack and we see
what happens?

> Secondly, it needs baking and testing time.
> 
> Cheers,
> Rusty.

I did some testing on this.  But proper testing just isn't happening out
of tree.

-- 
MST
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