[ovs-dev] [PATCH/RFC 0/9] Group Select: Selection Method Extension

[Simon Horman]

On Tue, Nov 25, 2014 at 03:30:01PM -0800, Ben Pfaff wrote:
> On Wed, Nov 19, 2014 at 09:44:54AM +0900, Simon Horman wrote:
> > this patch set implements the group select selection method extension that
> > I circulated some months ago on the dev at openvswtich.org mailing list.  For
> > reference a copy of that proposal (updated for the existence of an Open
> > Flow 1.5 draft and several errors found during implementation) is at the
> > end of this email.
> > 
> > The implementation makes use of a group experimenter property and
> > thus depends on my recent work to implement (draft) Open Flow 1.5
> > groups (ONF EXT-250). That work is already present in the master branch.
> > 
> > The last patch of the series adds an implementation of a hash selection
> > method to illustrate what a selection method might look like.  It may be
> > thought of as a less intelligent but more flexible than the default
> > selection method which I characterise as making hash of L2 and/or L3 fields
> > depending on which fields are present in the flow.
> 
> Hi Simon.  Thanks for submitting this.
> 
> I have a question about the status of the definition of this
> extension.  Is it an extension that is already in use, so that the OVS
> implementation should strive to be compatible with the existing
> implementation?  Or is it an extension for which this will be the
> first implementation?  The answer colors my review, since in the first
> case I'm mostly interested in faithfully implementing the extension in
> an interoperable way, whereas in the second I'm also interested in
> trying to ensure that it is defined in a way that is likely to be
> useful and maintainable and extensible in the long run.

It is the latter: this is the only implementation I am aware of
and I am not aware of any users in the wild.