Adding spec for fsl-sdn-os-mech-driver

New ML2 mechanism driver for Freescale CRD service.

Added asciiflow.com based image to illustrate the logical flow

Change-Id: I707093ab09e9738b5e63ea928ead1cddc7f10386

specs/juno/fsl-sdn-os-mech-driver.rst

@@ -0,0 +1,150 @@
+=====================================================
+Freescale SDN Mechanism Driver for Neutron ML2 plugin
+=====================================================
+
+https://blueprints.launchpad.net/neutron/+spec/fsl-sdn-os-mech-driver
+
+Freescale SDN (FSL-SDN) Mechanism Driver is an add-on support for ML2 plugin
+for Neutron. It supports the Cloud Resource Discovery (CRD) service by updating
+the Network, Subnet and Port Create/Update/Delete data into the CRD database.
+
+CRD service manages network nodes, virtual network appliances and openflow
+controller network applications.
+
++---------------------+
+|      Neutron        |
++-+-----------------+-+
+  |    ML2 Plugin   |
+  ++---------------++         +-------------+
+   | Freescale MD  | <------> | CRD Service |
+   +---------------+          +-------------+
+
+
+Problem description
+===================
+
+Openstack neutron based networks and ports information is required by
+CRD service to managed virtual network appliances and openflow controller
+apps.
+
+In order to send this information from neutron service, a new ML2
+mechanism driver is required to post the _postcommit data to the CRD
+service.
+
+Proposed change
+===============
+
+Freescale Mechanism driver handles the following postcommit operations.
+
+create_network_postcommit, create_subnet_postcommit, create_port_postcommit
+update_network_postcommit, update_subnet_postcommit, delete_network_postcommit
+delete_subnet_postcommit, delete_port_postcommit
+
+Supported network types by FSL OF Controller include vlan and vxlan.
+
+Since this mechanism driver doesn't require ovs-agent, bind port operations
+are handled within the mechansim driver.'bind_port' functions verifies the
+supported network types (vlan,vxlan) and calls context.set_binding
+with binding details.
+
+Freescale Openflow Controller manages the flows required on OVS.
+
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+Since CRD service is an independant service, no data model changes are
+introduced into neutron code base. Mechansim driver sends data via HTTP
+requests to CRD service.
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+neutronclient client api (HTTP) is used (python imports) to provide
+keystone based authentication to CRD service.
+
+Performance Impact
+------------------
+
+Negligible/None
+
+Though data is sent from mechansim driver to CRD service, the performance
+impact is negligible or None.
+
+Other deployer impact
+---------------------
+
+This change doesnt take immediate effect.
+To work with the change, neutron need to be configured with ml2,
+and fslsdn as mechanism driver with CRD service running.
+
+Developer impact
+----------------
+
+None.
+
+This change doesn't effect default neutron.conf.
+
+In ml2_conf.ini mechanins_driver needs to be configured with 'fslsdn'.
+
+New configuration file ml2_conf_fslsdn.ini needs to configured with
+CRD service information.
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  trinath-somanchi
+
+Other contributors:
+  None
+
+Work Items
+----------
+
+Mechanism Driver codebase
+
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+Existing Tempest testing for networks,ports covers
+the testing this mechanism driver.
+
+Documentation Impact
+====================
+
+may require documentation
+
+References
+==========
+
+None