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[Rodolfo Alonso <1707156@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1707156

Title:
  [RFE] Adoption of "os-vif" in Neutron

Status in neutron:
  Won't Fix

Bug description:
  [Existing problem]
  From `os-vif Nova SPEC`_, whenever a new Neutron mechanism driver is created, this results in the definition of a new VIF type. This situation generates two problems:

  * Nova developers need to maintain the plug/unplug code in the VIF drivers, which is defined bt the needs of the Neutron mechanism.
  * The format of the data passed between Nova and Neutron for the VIF port binding is fairly loosely defined (no versioning or formal definition).

  "os-vif" is being adopted progressively in Nova. As said before, "os-
  vif" is in charge of the plugging and unplugging operations for the
  existing VIF types.

  
  [Proposal]
  To adopt "os-vif" project in Neutron, decoupling any plug/unplug operations from Neutron.

  This RFE could be the container smaller contributions migrating step
  by step al VIF types in Neutron.

  This topic will be discussed during the Denver PTG [2].

  The proposed solution (to be discussed) is to add a new class in each
  mech driver agent, leveraging "os-vif" directly in our agent's
  plugging logic.

  
  [Benefits]
  * Centralize the plug/unplug operations in one common place.
  * Provide to Neutron a way to define VIF types as required by Nova. The definitions contained in "os-vif" will be used by both projects.
  * Remove from Neutron any plug/unplug driver specific operation, leaving to "os-vif" these actions. Neutron is supposed to be a L2-L4 SDN controller.

  
  [References]
  [1] `os-vif Nova SPEC`_: https://review.openstack.org/#/c/287090/
  [2] https://etherpad.openstack.org/p/neutron-queens-ptg
  [3] Nova os-vif library: https://review.openstack.org/#/q/topic:bp/os-vif-library,n,z

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