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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1506127

Title:
  enable vhost-user support with neutron ovs agent

Status in neutron:
  Fix Released

Bug description:
  In the kilo cycle vhost-user support was added to nova and supported out of tree 
  via the networking-ovs-dpdk ml2 driver and l2 agent on stack forge.

  in liberty agent modification were up streamed to enable the standard 
  neutron openvswitch agent to manage the netdev datapath.

  in mitika it is desirable to remove all dependence on the networking-ovs-dpdk repo
  and enable the standard ovs ml2 driver to support vhost-user on enabled vswitches.

  to enable vhost-user support the following changes are proposed to the
  neutron openvswitch agent and ml2 mechanism driver.

  AGENT CHANGES:

  To determine if a vswitch supports vhost user interface two pieces of information are required
  the bridge datapath_type and the list of supported interfaces form the ovsdb.
  the datapath_type feild is require to ensure the node is configured to used the dpdk enabled netdev datapath.

  the supported interfaces types field in the ovsdb contains  a list of all supported interface types for all supported datapath_types.
   if the ovs-vswitchd process has been compiled with supported for dpdk interface but not started with dpdk enabled , dpdk interfaces will be omitted from this list.

  the ovs neutron agent will be extended to query supported interfaces
  parameter in the ovsdb and append it to the configuration section of
  the agent state report.  the ovs neutron agent will be extended to
  append the configured datapath_type to the  configuration section of
  the agent state report. The OVS lib will be extended to retrieve the
  supported interfaces from the ovsdb.

  ML2 DRIVER CHANGES:

  the ovs ml2 agent will be extended to consult the agent configuration
  when selecting the vif type and vif binding details to install.

  if the datapath is netdev and the supported interface types contains
  vhost-user it will be enabled. in all other cases it will fall back to
  the current behavior.  this mechanism will allow easy extension of the
  ovs neutron agent to support other ovs interfaces type in the future
  if enabled in nova.

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