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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

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

** Changed in: neutron
    Milestone: None => kilo-2

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https://bugs.launchpad.net/bugs/1341020

Title:
  after add_port, get_port_ofport may be called before vswitchd has
  assigned the ofport

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  OVSBridge.add_port() runs ovs-vsctl to add the port, then runs ovs-
  vsctl again to query the ofport of the newly created port. The ofport
  gets assigned outside of any kind of transaction, and the OVS api
  defines an empty set response([]) to mean that the ofport assignment
  is still pending and a response of '-1' to mean that there is a
  failure.

  The current get_port_ofport code treats these responses both as
  failures even though '[]' will most likely later succeed. We need to
  implement a retry mechanism to ensure that we don't incorrectly fail
  port creation. Raising an exception on retry expiration also seems
  like a good idea.

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