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Hi all,

Modular agent seems to have to choose between two type of architecture [1].

As I understood during the last ML2 meeting [2], Extension driver
seems to be the most reasonnable choice.
But I think that those two approaches are complementory : Extension
drivers will deal with RPC callbacks form the plugin, wheras Agent
drivers will deal with controlling the underlying technology to
interpret those callbacks.

It looks like a controlPlane/Dataplane architecture. Could we have a
control plane manager on which each Extension driver should register
(and register callbacks it is listening at), and a data plane manager,
on which each dataplane controller will register (ofagent, ovs, LB..),
and which implement a common abastract class.
A port will be managed by only one dataplane controller, and when a
control plane driver wants to apply a modification on a port, it will
retrieve the correct dataplane controller for this port in order to
call one of the abstracted method to modify the dataplane.


[1]https://wiki.openstack.org/wiki/Neutron/ModularL2Agent#Possible_Directions
[2]http://eavesdrop.openstack.org/meetings/networking_ml2/2014/networking_ml2.2014-05-28-16.02.log.html