[ovs-dev] [PATCH 0/4] ovn: Schema modification for DPDK/userspace tunneling support in OVN-Openstack integration.

Gal Sagie gal.sagie at gmail.com
Wed Aug 26 19:14:40 UTC 2015

I agree this should move to the OpenStack mailing list as this related to
I agree with Ben and Russell here and don't think any of this needs to be
in OVN,

I am not that familiar with that effort, but there is an effort in Nova to
provide generic VIF binding
library (https://github.com/jaypipes/os_vif) and ways to let Nova run a
specific code for
different binding processes.

And keep in mind that OVN right now is not an ML2 driver, it switched to be
a core plugin.

I also think this relates to Nova configuration, but lets continue this in
the OpenStack mailing list

On Wed, Aug 26, 2015 at 10:03 PM, Russell Bryant <rbryant at redhat.com> wrote:

> On 08/26/2015 11:04 AM, Chandran, Sugesh wrote:
> > HI Russel,
> >
> > Please find the work flow as below.
> > 1.    A user requests nova to boot a vm
> > 2.    Nova schedules the vm based on the flavor and image properties to
> a host
> > 3.    Nova asks neutron to bind the neutron port basing the selected
> host name and some limited information in binding profile.
> > 4.    The neutron network driver(ML2/OVN driver)  that manages the
> selected node will then bind the port and select the vif type to use.
> > 5.    Nova reads the vif type selected by neutron and generates the
> Libvirt xml accordingly and boots the vm.
> > a.    For the normal interface nova plug the vhost-net interface to the
> OVS.
> > b.    In the dpdk case  during the boot process nova plug the  vhost
> user interface into ovs
> >
> > The VIF type(kernel vhosts/vhost-user/sriov) must be decided at step
> > 4 based on the capabilities of specific compute node to allow nova to
> > generate the correct Libvirt xml. Nova doesn’t know the capabilities
> > of selected compute node to decide what VIF type to be used in the
> > libvirt XML. It’s responsibility of Neutron to provide this
> > information because Nova is not supposed  to have any logic for
> > manage the network. Neutron can talk only to the OVN NorthDB and this
> > patch series will expose the relevant compute node details all the
> > way up-to Northbound_DB. So Neutron can then instruct Nova to boot VM
> > with right VIF type using the exposed information in the Northbound
> > DB.
> >
> > Since OVN is taking care of entire cloud network management, we feel
> > that its responsibility of OVN to provide enough information to
> > Nova->Hypervisor for booting the VM with right parameter set.
> Are you on the openstack-dev mailing list?  We should probably move the
> conversation over there at this point.  I can post something there.  I
> realize all of this isn't specific to using dpdk, but this interaction
> seems more complicated than necessary.  I'd like to see if we can
> simplify it, instead.
> --
> Russell Bryant
> _______________________________________________
> dev mailing list
> dev at openvswitch.org
> http://openvswitch.org/mailman/listinfo/dev

Best Regards ,

The G.

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