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+=================================================
+Service Function Chaining Driver for OpenDaylight
+=================================================
+
+This spec describes the plan to implement OpenStack networking-sfc[1] driver
+for OpenDaylight Controller.
+
+Problem Statement
+===================
+OpenStack SFC project (networking-sfc [1]) exposes generic APIs[2] for Service
+Function Chaining (SFC) that can be implemented by any backend networking
+service provider to support SFC. These APIs provide a way to integrate
+OpenStack SFC with any of the backend SFC providers. OpenDaylight SFC project
+provides a very mature implementation of SFC [3], but currently there is no
+formal integration mechanism present to consume OpenDaylight as an SFC provider
+for networking-sfc.
+
+Recently Tacker project [4] has been approved as an official project in
+OpenStack, that opens many possibilities to realize the NFV use cases (e.g SFC)
+using OpenStack as a platform. Providing a formal end to end integration
+between OpenStack and OpenDaylight for SFC use case will help NFV users
+leverage OpenStack, Tacker and OpenDaylight as a solution. A POC for this
+integration work has already been implemented [5][6] by Tim Rozet, but in
+this POC work, Tacker directly communicates to OpenDaylight SFC & classifier
+providers and not through OpenStack SFC APIs (networking-sfc).
+
+Proposed Change
+===============
+Implementation of this spec will introduce a networking-sfc[1] driver for
+OpenDaylight Controller in networking-odl project that will pass through
+the networking-sfc API's call to the OpenDaylight Controller.
+
+Detailed Design
+===============
+To enable the formal end to end integration between OpenStack SFC and
+OpenDaylight requires an SFC driver for OpenDaylight. ODL SFC driver will
+act as a shim layer between OpenStack and OpenDaylight that will carry out
+following two main tasks:
+
+* Translation of OpenStack SFC Classifier API to ODL SFC classifier yang
+ models**.
+
+* Translation of OpenStack SFC API's to OpenDaylight Neutron Northbound
+ SFC models** [8].
+
+** This work is not yet done, but the OpenDaylight neutron northbound project
+needs to come up with yang models for SFC classification/chain. These models
+will be based on the existing networking-sfc APIs. This work is out of scope
+of networking-odl work and will be collaborated in the scope of OpenDaylight
+Neutron Northbound project.
+
+SFC providers (E.g Net-Virt, GBP, SFC ) in OpenDaylight can listen to these
+OpenDaylight Neutron Northbound SFC models and translate it to their specific
+yang models for classification/sfc. The following diagram shows the high level
+integration between OpenStack and the OpenDaylight SFC provider::
+
+ +---------------------------------------------+
+ | OpenStack Network Server (networking-sfc) |
+ | +-------------------+ |
+ | | networking-odl | |
+ | | SFC Driver | |
+ | +-------------------+ |
+ +----------------------|----------------------+
+ | REST Communication
+ |
+ -----------------------
+ OpenDaylight Controller | |
+ +-----------------------|-----------------------|---------------+
+ | +----------v----+ +---v---+ |
+ | Neutron | SFC Classifier| |SFC | Neutron |
+ | Northbound | Models | |Models | Northbound|
+ | Project +---------------+ +-------+ Project |
+ | / \ | |
+ | / \ | |
+ | / \ | |
+ | +-----V--+ +---V----+ +---V---+ |
+ | |Net-Virt| ... | GBP | | SFC | ... |
+ | +---------+ +--------+ +-------+ |
+ +-----------|----------------|------------------|---------------+
+ | | |
+ | | |
+ +-----------V----------------V------------------V---------------+
+ | Network/OVS |
+ | |
+ +---------------------------------------------------------------+
+
+In the above architecture, the opendaylight components are shown just to
+understand the overall architecture, but it's out of scope of this spec's
+work items. This spec will only track progress related to networking-odl
+OpenStack sfc driver work.
+
+Given that OpenStack SFC APIs are port-pair based API's and OpenDaylight SFC
+API's are based on IETF SFC yang models[8], there might be situations where
+translation might requires API enhancement from OpenStack SFC. Networking SFC
+team is open for these new enhancement requirements given that they are generic
+enough to be leveraged by other backend SFC providers[9]. This work will be
+leveraging the POC work done by Tim [10] to come up with the first version of
+SFC driver.
+
+Dependencies
+============
+It has a dependency on OpenDaylight Neutron Northbound SFC classifier and chain
+yang models, but that is out of scope of this spec.
+
+Impact
+======
+None
+
+Assignee(s)
+===========
+
+Following developers will be the initial contributor to the driver, but we will
+be happy to have more contributor on board.
+
+* Anil Vishnoi (vishnoianil@gmail.com, irc: vishnoianil)
+* Tim Rozet (trozet@redhat.com, irc: trozet)
+
+References
+==========
+
+[1] http://docs.openstack.org/developer/networking-sfc/
+
+[2] https://github.com/openstack/networking-sfc/blob/master/doc/source/api.rst
+
+[3] https://wiki.opendaylight.org/view/Service_Function_Chaining:Main
+
+[4] https://wiki.openstack.org/wiki/Tacker
+
+[5] https://github.com/trozet/tacker/tree/SFC_brahmaputra/tacker/sfc
+
+[6] https://github.com/trozet/tacker/tree/SFC_brahmaputra/tacker/sfc_classifier
+
+[7] https://tools.ietf.org/html/draft-ietf-netmod-acl-model-05
+
+[8] https://wiki.opendaylight.org/view/NeutronNorthbound:Main
+
+[9] http://eavesdrop.openstack.org/meetings/service_chaining/2016/service_chaining.2016-03-31-17.00.log.html
+
+[10] https://github.com/trozet/tacker/blob/SFC_brahmaputra/tacker/sfc/drivers/opendaylight.py