netdev - Re: [net-next PATCH v5 0/6] XDP for virtio

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Date:   Fri, 9 Dec 2016 05:01:30 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     David Miller <davem@...emloft.net>
Cc:     john.fastabend@...il.com, alexei.starovoitov@...il.com,
        daniel@...earbox.net, shm@...ulusnetworks.com, tgraf@...g.ch,
        john.r.fastabend@...el.com, netdev@...r.kernel.org,
        brouer@...hat.com
Subject: Re: [net-next PATCH v5 0/6] XDP for virtio_net

On Thu, Dec 08, 2016 at 05:16:02PM -0500, David Miller wrote:
> From: John Fastabend <john.fastabend@...il.com>
> Date: Thu, 8 Dec 2016 12:46:07 -0800
> 
> > On 16-12-08 11:38 AM, Alexei Starovoitov wrote:
> >> On Thu, Dec 08, 2016 at 02:17:02PM -0500, David Miller wrote:
> >>> From: John Fastabend <john.fastabend@...il.com>
> >>> Date: Wed, 07 Dec 2016 12:10:47 -0800
> >>>
> >>>> This implements virtio_net for the mergeable buffers and big_packet
> >>>> modes. I tested this with vhost_net running on qemu and did not see
> >>>> any issues. For testing num_buf > 1 I added a hack to vhost driver
> >>>> to only but 100 bytes per buffer.
> >>>  ...
> >>>
> >>> So where are we with this?
> > 
> > There is one possible issue with a hang that Michael pointed out. I can
> > either spin a v6 or if you pull this v5 series in I can post a bugfix
> > for it. I am not seeing the issue in practice XDP virtio has been up
> > and running on my box here for days without issue.
> 
> If that's the case then please spin a v6 and I'll apply it.

I think 1/6 should be reworked, disabling/enabling GUEST_TSO
transparently without touching the LRO flag, and without adding
NDO callback.

-- 
MST