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Yes, that sounds good to be able to load extensions from a mechanism driver.

But another problem I think we have with ML2 plugin is the list extensions
supported by default [1].
The extensions should only load by MD and the ML2 plugin should only
implement the Neutron core API.

Any though ?
Édouard.

[1]
https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/plugin.py#L87



On Fri, Mar 7, 2014 at 8:32 AM, Akihiro Motoki <amotoki at gmail.com> wrote:

> Hi,
>
> I think it is better to continue the discussion here. It is a good log :-)
>
> Eugine and I talked the related topic to allow drivers to load
> extensions)  in Icehouse Summit
> but I could not have enough time to work on it during Icehouse.
> I am still interested in implementing it and will register a blueprint on
> it.
>
> etherpad in icehouse summit has baseline thought on how to achieve it.
> https://etherpad.openstack.org/p/icehouse-neutron-vendor-extension
> I hope it is a good start point of the discussion.
>
> Thanks,
> Akihiro
>
> On Fri, Mar 7, 2014 at 4:07 PM, Nader Lahouti <nader.lahouti at gmail.com>
> wrote:
> > Hi Kyle,
> >
> > Just wanted to clarify: Should I continue using this mailing list to
> post my
> > question/concerns about ML2? Please advise.
> >
> > Thanks,
> > Nader.
> >
> >
> >
> > On Thu, Mar 6, 2014 at 1:50 PM, Kyle Mestery <mestery at noironetworks.com>
> > wrote:
> >>
> >> Thanks Edgar, I think this is the appropriate place to continue this
> >> discussion.
> >>
> >>
> >> On Thu, Mar 6, 2014 at 2:52 PM, Edgar Magana <emagana at plumgrid.com>
> wrote:
> >>>
> >>> Nader,
> >>>
> >>> I would encourage you to first discuss the possible extension with the
> >>> ML2 team. Rober and Kyle are leading this effort and they have a IRC
> meeting
> >>> every week:
> >>> https://wiki.openstack.org/wiki/Meetings#ML2_Network_sub-team_meeting
> >>>
> >>> Bring your concerns on this meeting and get the right feedback.
> >>>
> >>> Thanks,
> >>>
> >>> Edgar
> >>>
> >>> From: Nader Lahouti <nader.lahouti at gmail.com>
> >>> Reply-To: OpenStack List <openstack-dev at lists.openstack.org>
> >>> Date: Thursday, March 6, 2014 12:14 PM
> >>> To: OpenStack List <openstack-dev at lists.openstack.org>
> >>> Subject: Re: [openstack-dev] [Neutron][ML2]
> >>>
> >>> Hi Aaron,
> >>>
> >>> I appreciate your reply.
> >>>
> >>> Here is some more details on what I'm trying to do:
> >>> I need to add new attribute to the network resource using extensions
> >>> (i.e. network config profile) and use it in the mechanism driver (in
> the
> >>> create_network_precommit/postcommit).
> >>> If I use current implementation of Ml2Plugin, when a call is made to
> >>> mechanism driver's create_network_precommit/postcommit the new
> attribute is
> >>> not included in the 'mech_context'
> >>> Here is code from Ml2Plugin:
> >>> class Ml2Plugin(...):
> >>> ...
> >>>        def create_network(self, context, network):
> >>>             net_data = network['network']
> >>> ...
> >>>         with session.begin(subtransactions=True):
> >>>             self._ensure_default_security_group(context, tenant_id)
> >>>             result = super(Ml2Plugin, self).create_network(context,
> >>> network)
> >>>             network_id = result['id']
> >>> ...
> >>>             mech_context = driver_context.NetworkContext(self, context,
> >>> result)
> >>>
> self.mechanism_manager.create_network_precommit(mech_context)
> >>>
> >>> Also need to include new extension in the
>  _supported_extension_aliases.
> >>>
> >>> So to avoid changes in the existing code, I was going to create my own
> >>> plugin (which will be very similar to Ml2Plugin) and use it as
> core_plugin.
> >>>
> >>> Please advise the right solution implementing that.
> >>>
> >>> Regards,
> >>> Nader.
> >>>
> >>>
> >>> On Wed, Mar 5, 2014 at 11:49 PM, Aaron Rosen <aaronorosen at gmail.com>
> >>> wrote:
> >>>>
> >>>> Hi Nader,
> >>>>
> >>>> Devstack's default plugin is ML2. Usually you wouldn't 'inherit' one
> >>>> plugin in another. I'm guessing  you probably wire a driver that ML2
> can use
> >>>> though it's hard to tell from the information you've provided what
> you're
> >>>> trying to do.
> >>>>
> >>>> Best,
> >>>>
> >>>> Aaron
> >>>>
> >>>>
> >>>> On Wed, Mar 5, 2014 at 10:42 PM, Nader Lahouti <
> nader.lahouti at gmail.com>
> >>>> wrote:
> >>>>>
> >>>>> Hi All,
> >>>>>
> >>>>> I have a question regarding ML2 plugin in neutron:
> >>>>> My understanding is that, 'Ml2Plugin' is the default core_plugin for
> >>>>> neutron ML2. We can use either the default plugin or our own plugin
> (i.e.
> >>>>> my_ml2_core_plugin that can be inherited from Ml2Plugin) and use it
> as
> >>>>> core_plugin.
> >>>>>
> >>>>> Is my understanding correct?
> >>>>>
> >>>>>
> >>>>> Regards,
> >>>>> Nader.
> >>>>>
> >>>>> _______________________________________________
> >>>>> OpenStack-dev mailing list
> >>>>> OpenStack-dev at lists.openstack.org
> >>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >>>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> OpenStack-dev mailing list
> >>>> OpenStack-dev at lists.openstack.org
> >>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >>>>
> >>>
> >>> _______________________________________________ OpenStack-dev mailing
> >>> list OpenStack-dev at lists.openstack.org
> >>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >>>
> >>> _______________________________________________
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> >>>
> >>
> >>
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> >>
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