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

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Message-ID: <878v1838iu.fsf@rustcorp.com.au>
Date:	Mon, 15 Jul 2013 11:10:41 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
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

"Michael S. Tsirkin" <mst@...hat.com> writes:
> 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 ...

Here's the general order:
- 1 week before Linus merge window: I stop putting new stuff into xxx-next.
- Linus merge window open: I push stuff to Linus, new stuff stays in -pending.
- Linus merge window close: I ff my -next trees to -rc1, merge stuff
  from -pending.

In this case, your patch will go from pending-rebases to DaveM, not
virtio-next.

Which I will do now...

Cheers,
Rusty.
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