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[Weifan Fu <1805235@xxxxxxxxxxxxxxxxxx>]

** Changed in: networking-bigswitch
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1805235

Title:
  [neutron-tempest-plugin] delete_router calls
  remove_router_extra_routes even when extra_routes extension is
  disabled

Status in networking-bigswitch:
  Fix Released
Status in neutron:
  Fix Released

Bug description:
  A recent change [1] to neutron-tempest-plugin is causing a tempest
  failure when running against networking-bigswitch neutron plugin with
  L3 functionality provided by networking-bigswitch.

  The failure stack trace looks as follows:

  17:12:37 tearDownClass (neutron_tempest_plugin.scenario.admin.test_floatingip.FloatingIpTestCasesAdmin)
  17:12:37 ----------------------------------------------------------------------------------------------
  17:12:37 
  17:12:37 Captured traceback:
  17:12:37 ~~~~~~~~~~~~~~~~~~~
  17:12:37     Traceback (most recent call last):
  17:12:37       File "tempest/test.py", line 224, in tearDownClass
  17:12:37         six.reraise(etype, value, trace)
  17:12:37       File "tempest/test.py", line 196, in tearDownClass
  17:12:37         teardown()
  17:12:37       File "/opt/stack/neutron-tempest-plugin/neutron_tempest_plugin/scenario/admin/test_floatingip.py", line 56, in resource_cleanup
  17:12:37         super(FloatingIpTestCasesAdmin, cls).resource_cleanup()
  17:12:37       File "/opt/stack/neutron-tempest-plugin/neutron_tempest_plugin/api/base.py", line 149, in resource_cleanup
  17:12:37         router)
  17:12:37       File "/opt/stack/neutron-tempest-plugin/neutron_tempest_plugin/api/base.py", line 260, in _try_delete_resource
  17:12:37         delete_callable(*args, **kwargs)
  17:12:37       File "/opt/stack/neutron-tempest-plugin/neutron_tempest_plugin/api/base.py", line 679, in delete_router
  17:12:37         client.remove_router_extra_routes(router['id'])
  17:12:37       File "/opt/stack/neutron-tempest-plugin/neutron_tempest_plugin/services/network/json/network_client.py", line 452, in remove_router_extra_routes
  17:12:37         self.update_router(router_id, routes=None)
  17:12:37       File "/opt/stack/neutron-tempest-plugin/neutron_tempest_plugin/services/network/json/network_client.py", line 394, in update_router
  17:12:37         return self._update_router(router_id, set_enable_snat=False, **kwargs)
  17:12:37       File "/opt/stack/neutron-tempest-plugin/neutron_tempest_plugin/services/network/json/network_client.py", line 382, in _update_router
  17:12:37         resp, body = self.put(uri, update_body)
  17:12:37       File "tempest/lib/common/rest_client.py", line 344, in put
  17:12:37         return self.request('PUT', url, extra_headers, headers, body, chunked)
  17:12:37       File "tempest/lib/common/rest_client.py", line 676, in request
  17:12:37         self._error_checker(resp, resp_body)
  17:12:37       File "tempest/lib/common/rest_client.py", line 787, in _error_checker
  17:12:37         raise exceptions.BadRequest(resp_body, resp=resp)
  17:12:37     tempest.lib.exceptions.BadRequest: Bad request
  17:12:37     Details: {u'type': u'HTTPBadRequest', u'detail': u'', u'message': u"Unrecognized attribute(s) 'routes'"}
  17:12:37

  Failure is not during actual test, but rather during tearDown of the test.
  Further inspection points to this line [2] being added to delete_router method of the base class.
  Typically there is an 'if routes in kwargs' or 'if extra_routes extension enabled' sort of check, before calling the extra_route related add/delete methods.

  Not sure if this was intentional and extra_routes is now a mandatory
  extension. Please correct me if I'm wrong and I can update the neutron
  plugin to handle it correctly.

  Steps to Reproduce:
   - install devstack with a third party neutron L3 plugin enabled
   - ensure that this plugin does not support extra_routes extension
   - run tempest with neutron-tempest-plugin enabled and enabling only floating_ip tests (to trigger L3 methods)

  Probable change-id that can provide more info about why the remove was
  added and if it needs change:
  Ie9903b7078d6fcff307c5d76770d92df1152d473

  [1] https://github.com/openstack/neutron-tempest-plugin/commit/b1a3289fe4b98d1270844aa81f60604e64ae50cf
  [2] https://github.com/openstack/neutron-tempest-plugin/blob/b1a3289fe4b98d1270844aa81f60604e64ae50cf/neutron_tempest_plugin/api/base.py#L673

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