From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling Date: Tue, 7 Jun 2011 19:08:30 +0300 Message-ID: <20110607160830.GB17581@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Krishna Kumar , Carsten Otte , lguest-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, Shirley Ma , kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, habanero-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, Heiko Carstens , virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, steved-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org, Christian Borntraeger , Tom Lendacky , Martin Schwidefsky , linux390-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: lguest-bounces+glkvl-lguest=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: lguest-bounces+glkvl-lguest=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org List-Id: netdev.vger.kernel.org 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