Service Chain driver for NVSD Controller

This spec proposes a Service Chain driver to be used with the
GBP Service Chain plugin framework to render service chains
using One Convergence NVSD controller.

Change-Id: I1afb30b8b14fe18196c5d804207d266d3e7a855d
Implements: blueprint gbp-oc-nvsd-servicechain-driver

specs/juno/gbp-oc-nvsd-servicechain-driver.rst

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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+===========================================================================
+Group Based Policy Service Chain Driver for One Convergence NVSD Controller
+===========================================================================
+
+https://blueprints.launchpad.net/group-based-policy/+spec/gbp-oc-nvsd-servicechain-driver
+
+This blueprint proposes a Group Based Policy (GBP) Service Chain driver to
+realize GBP Service Chain APIs with One Convergence NVSD controller.
+
+Problem description
+===================
+
+One Convergence NVSD controller implements an overlay fabric to provide
+virtual networks and enable the deployment of network services in the
+virtual networks. GBP Service Chain APIs define the abstractions for
+specifying a chain of services that can be used as a target in GBP
+Policy Rules. GBP Service Chain plugin framework provides the capability to
+use different drivers to render the Service Chain definition using a specific
+technology. One Convergence GBP Service Chain driver is required to implement
+the GBP Service Chain APIs [2] using the connectivity, policy flow and service
+insertion primitives provided by NVSD controller.
+
+Proposed change
+===============
+
+We propose the addition of a new GBP Service Chain driver to implement the
+GBP Service Chain APIs [2] and render the Service Chain using the NVSD
+controller. This driver will proxy the APIs via REST interface to the NVSD
+controller. The GBP Service Chain driver for NVSD controller will implement
+the Service Chain driver interface based on the null implementation provided
+in services.servicechain.drivers.dummy_driver.NoopDriver.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None (existing GBP Service Chain model is used)
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+The driver will reuse the configuration for NVSD Neutron plugin [2] to access
+the NVSD controller.
+
+Performance Impact
+------------------
+
+This driver should allow for a more extensive rendering of GBP Service Chain
+definitions using the One Convergence NVSD controller.
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Magesh GV (magesh-gv)
+
+Hemanth Ravi (hemanth-ravi)
+
+Subrahmanyam Ongole (songole)
+
+
+Work Items
+----------
+
+1. Developing the NVSD GBP Service Chain driver
+
+Dependencies
+============
+
+Group Based Policy Plugin
+Group Based Policy Service Chain Plugin
+
+Testing
+=======
+
+Unit tests will be provided.
+
+The 3rd party One Convergence CI setup will be enhanced to cover the
+testing of NVSD GBP Service Chain driver using the NVSD controller.
+
+Documentation Impact
+====================
+
+Documentation needs to be updated to reflect the addition of a new
+GBP Service Chain driver and it's configuration parameters.
+
+References
+==========
+
+.. [1] Group-based Policy Abstractions: https://review.openstack.org/#/c/123494/
+
+.. [2] Group based Policy Network Service Chaining:
+       https://review.openstack.org/#/c/125876/
+
+.. [3] NVSD Neutron Plugin: https://review.openstack.org/#/c/69246/