linux-kernel - Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling

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Date:	Tue, 7 Jun 2011 19:08:30 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Shirley Ma <xma@...ibm.com>, lguest@...ts.ozlabs.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org, kvm@...r.kernel.org,
	Krishna Kumar <krkumar2@...ibm.com>,
	Tom Lendacky <tahm@...ux.vnet.ibm.com>, steved@...ibm.com,
	habanero@...ux.vnet.ibm.com
Subject: Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling

On Thu, Jun 02, 2011 at 06:42:35PM +0300, Michael S. Tsirkin wrote:
> OK, here's a new attempt to use the new capacity api.  I also added more
> comments to clarify the logic.  Hope this is more readable.  Let me know
> pls.
> 
> This is on top of the patches applied by Rusty.
> 
> Warning: untested. Posting now to give people chance to
> comment on the API.

OK, this seems to have survived some testing so far,
after I dropped patch 4 and fixed build for patch 3
(build fixup patch sent in reply to the original).

I'll be mostly offline until Sunday, would appreciate
testing reports.

git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git
virtio-net-xmit-polling-v2
git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git
virtio-net-event-idx-v3

Thanks!

> Changes from v1:
> - fix comment in patch 2 to correct confusion noted by Rusty
> - rewrite patch 3 along the lines suggested by Rusty
>   note: it's not exactly the same but I hope it's close
>   enough, the main difference is that mine does limited
>   polling even in the unlikely xmit failure case.
> - added a patch to not return capacity from add_buf
>   it always looked like a weird hack
> 
> Michael S. Tsirkin (4):
>   virtio_ring: add capacity check API
>   virtio_net: fix tx capacity checks using new API
>   virtio_net: limit xmit polling
>   Revert "virtio: make add_buf return capacity remaining:
> 
>  drivers/net/virtio_net.c     |  111 ++++++++++++++++++++++++++----------------
>  drivers/virtio/virtio_ring.c |   10 +++-
>  include/linux/virtio.h       |    7 ++-
>  3 files changed, 84 insertions(+), 44 deletions(-)
> 
> -- 
> 1.7.5.53.gc233e
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