[libvirt] Any plans to extend openvswitch configuration in libvirt?

james robson jrobson at websense.com
Wed Nov 28 16:27:40 UTC 2012

On Tue, 2012-11-27 at 14:28 -0500, Laine Stump wrote:
> On 11/27/2012 10:03 AM, james robson wrote:
> > Hello All,
> >
> > Are there any current plans to extend the openvswitch port configuration
> > options to include the 'native-tagged' and 'native-untagged' vlan modes?
> > I'm currently setting up a test lab that is going to require the
> > 'native-untagged' vlan mode on openvswitch and would prefer to keep
> > these setting with the other network configuration for my virtual
> > machines. 
> >
> > I can produce a patch for this functionality myself, but don't want to
> > duplicate effort if someone else is all ready working on it.
> Nobody is working on it that I know of, and patches would certainly be
> welcome! I assume that configuration would simply be some extra
> element/attribute that goes inside of the <vlan> element?

My current plan is to add two attributes to the <vlan> element. They
* 'native_mode' which can have a value of 'tagged' or 'untagged'.
* 'native_tag' to hold the vlan id. 

So for instance the xml would contain "<vlan native_mode='untagged'
native_tag='123'>" or "<vlan native_mode='tagged' native_tag='123'>".

> If you do make a patch, note that the <vlan> that ends up getting used
> for the interface could come from either the <network> vlan element, the
> vlan element of a <portgroup> within the network, or the vlan within the
> guest's own vlan element (I've listed those in reverse order of
> priority). As long as you properly update virNetDevVlanCopy to copy the
> new data, that should take care of itself. (Also don't forget to update
> the other utility functions in virnetdevvlan.c)
> (Another nice patch would be one to make libvirt's "managed" networks
> recognize the presence of <virtualport type='openvswitch'/> and
> create/use an Open vSwitch bridge instead of the standard Linux host
> bridge. It shouldn't be difficult, but nobody has gotten around to it.)

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