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[OpenStack Infra <1531022@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/460672
Committed: https://git.openstack.org/cgit/openstack/nova-powervm/commit/?id=dedc355805c24583fbad5f4e5c416881239e377e
Submitter: Jenkins
Branch:    master

commit dedc355805c24583fbad5f4e5c416881239e377e
Author: ymadhavi@xxxxxxxxxx <ymadhavi@xxxxxxxxxx>
Date:   Thu Apr 27 12:43:07 2017 -0400

    Deallocate network on reschedule
    
    When a virtual machine fails to deploy on one host
    then deallocate networks so that when the same
    virtual machine deployed on another host network
    is allocated again.
    
    Change-Id: I9624e44def8afa01c45527d625917adb6847c55f
    Closes-bug: #1531022


** Changed in: nova-powervm
       Status: In Progress => Fix Released

** Tags added: in-stable-ocata

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https://bugs.launchpad.net/bugs/1531022

Title:
  libvirt driver doesn't cleanup the tap interface on vm re-schedule

Status in OpenStack Compute (nova):
  In Progress
Status in nova-powervm:
  Fix Released

Bug description:
  Here when you use libvirt driver with tap interfaces, it creates a tap
  interface on the host but doesn't clean up the interface and leaves
  in-tact and creates another same named interface on the new host.

  In _do_build_and_run_instance when RescheduledException is called,
  manager checks if the network port needs to be de-allocated for a
  different host or not using  deallocate_networks_on_reschedule() which
  is hard coded to return False. If this is changed to return true or
  set via conf file configuration to allow being changed for specific
  mech drivers in neutron then it would be helpful to not only clean up
  the tap interface properly but also also mech drivers in neutron to
  re-create new ports on new host instead of shifting and re-using same
  ports which fails.

  tested on master and stable/liberty and fails in both cases, so may
  need back porting.

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