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[OpenStack Infra <1845354@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/684805
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=761b91fd221914ce06ded381264740abc29fe066
Submitter: Zuul
Branch:    master

commit 761b91fd221914ce06ded381264740abc29fe066
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Wed Sep 25 16:23:31 2019 +0000

    Randomize VNI in FdbInterfaceTestCase
    
    Randomize VNI in FdbInterfaceTestCase to avoid clashes if several test
    cases are creating VXLAN interfaces in the kernel namespace at the
    same time.
    
    Change-Id: Ic90fa31aa15723eab7f518a42762a7f1c80ee736
    Closes-Bug: #1845354


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1845354

Title:
  [FT] FdbInterfaceTestCase test cases failing when creating two VTI
  with the same VNI

Status in neutron:
  Fix Released

Bug description:
  In "FdbInterfaceTestCase" test cases (no namespace scenario), can
  happen that two test cases are creating VXLAN interfaces in the kernel
  namespace (VTI) in the same VTEP and the same destination port
  (default=4789). In this case, the kernel will raise the exception
  errno.EEXIST (file already exists).

  In order to avoid this problem, a random VNI could be used when
  creating the VXLAN interfaces.

  LOGS:
  [1]https://9722deaa313ebebb56dc-c08b881decb3106ff13d720dd4a26025.ssl.cf5.rackcdn.com/681846/5/check/neutron-functional-python27/c3dc48a/testr_results.html.gz

  HOW TO TEST IT:
  from neutron.agent.linux import ip_lib
  from neutron.privileged.agent.linux import ip_lib as priv_ip_lib
  ns_name = 'ns_test'
  try:
      priv_ip_lib.remove_netns(ns_name)
  except:
      pass
  priv_ip_lib.create_netns(ns_name)
  dev = 'device'
  dev2 = 'device2'
  dev_vxlan = 'device_vxlan'
  dev_vxlan2 = 'device_vxlan2'
  ip_wrapper = ip_lib.IPWrapper(ns_name)
  ip_wrapper.add_dummy(dev)
  ip_wrapper.add_dummy(dev2)
  ip_device1 = ip_lib.IPDevice(dev, ns_name)
  ip_device2 = ip_lib.IPDevice(dev2, ns_name)
  ip_device1.link.set_up()
  ip_device2.link.set_up()
  ip_wrapper.add_vxlan(dev_vxlan, 100, dev=dev)
  try:
      ip_wrapper.add_vxlan(dev_vxlan2, 100, dev=dev2)
  except Exception as e:
      print(str(e))
  priv_ip_lib.remove_netns(ns_name)

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