Re: [virtio-dev] [PATCH v4] content: Introduce VIRTIO_NET_F_STANDBY feature

[Cornelia Huck <cohuck@redhat.com>]

On Wed, 12 Sep 2018 11:22:12 -0400
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> On Wed, Sep 12, 2018 at 08:17:45AM -0700, Samudrala, Sridhar wrote:
> > 
> > 
> > On 9/7/2018 2:34 PM, Michael S. Tsirkin wrote:  
> > > On Wed, Aug 15, 2018 at 11:49:15AM -0700, Sridhar Samudrala wrote:  
> > > > VIRTIO_NET_F_STANDBY feature enables hypervisor to indicate virtio_net
> > > > device to act as a standby for another device with the same MAC address.
> > > > 
> > > > Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
> > > > Acked-by: Cornelia Huck <cohuck@redhat.com>
> > > > Fixes: https://github.com/oasis-tcs/virtio-spec/issues/18  
> > > Applied but when do you plan to add documentation as pointed
> > > out by Jan and Halil?  
> > 
> > I thought additional documentation will be done as part of the Qemu enablement
> > patches and i hope someone in RH is looking into it.
> > 
> > Does it make sense to add a link to to the kernel documentation of this feature in
> > the spec
> >  https://www.kernel.org/doc/html/latest/networking/net_failover.html  
> 
> 
> I do not think this will address the comments posted.  Specifically we
> should probably include documentation for what is a standby and primary:
> what is expected of driver (maintain configuration on standby, support
> primary coming and going, transmit on standby only if there is no
> primary) and of device (have same mac for standby as for standby).

Yes, we need some definitive statements of what a driver and a device
is supposed to do in order to conform; it might make sense to discuss
this in conjunction with discussion on any QEMU patches (have not
checked whether anything has been posted, just returned from vacation).

I assume that we still stick with the plan to implement/document
MAC-based handling first and then enhance with other methods later?

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