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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