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Wednesday, May 14 • 11:50am - 12:30pm
ML2 Juno Roadmap

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Internal ML2 technical details and architecture session.

This session will include the following subject(s):

Extension support for ML2 Mechanism Drivers:

Support for extensions in ML2 Mechanism Drivers.


With existing ML2Plugin, only extensions defined in the plugin are supported and if a mechanism driver defines
a new extension it won't be loaded.
This blueprint is addressing this issue.

The following changes can be considered as a solution to support extensions in mechanism driver:
1. If mechanism driver needs to support any extension, it should add:
a) _supported_extension_aliases attribute to its class.
b) extension path to the api_extensions_path.
2. Add new method in Ml2Plugin:
This new method should go through the order_mech_drivers and if there is any aliases supported, add it to existing
list of aliases in the Ml2Plugin (i.e. _supported_extension_aliases)

3. In resource's post/pre_commit method (for network, port, subnet) there is no way for mechanism driver to know the original
data passed to the plaugin.
For instance for network resource, when a network is created with an extension attribute in the network parameters, according
to the code below, the 'result' and 'mech_context' do not include the extension's attribute. So mechanism driver cannot use
the required info passed to the create_network.
365 def create_network(self, context, network):
366 net_data = network['network']

Wednesday May 14, 2014 11:50am - 12:30pm EDT

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