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

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Message-ID: <20130710061407.GC19759@redhat.com>
Date:	Wed, 10 Jul 2013 09:14:07 +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 05:38:51PM +0930, Rusty Russell wrote:
> "Michael S. Tsirkin" <mst@...hat.com> writes:
> > 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?
> 
> If you convince DaveM, I won't object :)
> 
> >> 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.
> 
> But it will get into linux-next for the *next* merge window.
> 
> Cheers,
> Rusty.

Okay. Can you put it on virtio-next then?
I don't see it there ...

-- 
MST
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