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[Preethi Dsilva <preethi.dsilva@xxxxxxx>]

** Project changed: nova => neutron

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https://bugs.launchpad.net/bugs/1572509

Title:
  Nova boot fails when freed SRIOV port is used for booting

Status in neutron:
  New

Bug description:
  Nova boot fails when freed SRIOV port is used for booting

  steps to reproduce:
  ==================
  1.create a SRIOV port
  2.boot a vm -->Boot is successful and vm gets ip
  3.now delete the vm using nova delete --successful (mac is released from VF)
  4.using the port created in step 1 boot a new vm.

  VM fails to boot with following error
  [01;31m2016-04-20 10:55:05.005 TRACE nova.compute.manager ^[[01;35m[instance: a47344fb-3254-4409-9c23-55e3cde693d9] ^[[00m    hostname=instance.hostname)
  ^[[01;31m2016-04-20 10:55:05.005 TRACE nova.compute.manager ^[[01;35m[instance: a47344fb-3254-4409-9c23-55e3cde693d9] ^[[00mPortNotUsableDNS: Port 7219a612-014e-452e-b79a-19c87cc33db4 not usable for instance a47344fb-3254-4409-9c23-55e3cde693d9. Value vm4 assigned to dns_name attribute does not match instance's hostname vmtest4
  ^[[01;31m2016-04-20 10:55:05.005 TRACE nova.compute.manager ^[[01;35m[instance: a47344fb-3254-4409-9c23-55e3cde693d9] ^[[00m

  Expected :
  =========
  As port is unbound in step 3 we should be able to bind it in step 4.

  The setup consists of controller and compute node with Mellanox card
  enabled for SRIOV. Ubuntu 14.04 qcow2 image is used for tenant VM boot

  Tested the above with MItaka code.

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