text: #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  from neutron_lib import constants
  from neutronclient.common import exceptions
  from oslo_utils import uuidutils
  
  from neutron.tests.common.agents import l2_extensions
  from neutron.tests.fullstack import base
  from neutron.tests.fullstack.resources import config
  from neutron.tests.fullstack.resources import environment
  from neutron.tests.unit import testlib_api
  
  load_tests = testlib_api.module_load_tests
  
  
  class BaseSegmentationIdTest(base.BaseFullStackTestCase):
  
      network_type = "vlan"
  
      def setUp(self):
          host_descriptions = [
              environment.HostDescription(
                  l2_agent_type=self.l2_agent_type, l3_agent=False
              ) for _ in range(self.num_hosts)]
          env = environment.Environment(
              environment.EnvironmentDescription(
                  network_type=self.network_type),
              host_descriptions)
  
          super(BaseSegmentationIdTest, self).setUp(env)
          self.project_id = uuidutils.generate_uuid()
  
      def _create_network(self):
          seg_id = 100
          network = self.safe_client.create_network(
              self.project_id, network_type=self.network_type,
              segmentation_id=seg_id,
              physical_network=config.PHYSICAL_NETWORK_NAME)
          self.assertEqual(seg_id, network['provider:segmentation_id'])
  
          # Ensure that segmentation_id is really set properly in DB
          network = self.safe_client.client.show_network(
              network['id'])['network']
          self.assertEqual(seg_id, network['provider:segmentation_id'])
          return network
  
      def _update_segmentation_id(self, network):
          new_seg_id = network['provider:segmentation_id'] + 1
          new_net_args = {'provider:segmentation_id': new_seg_id}
          network = self.safe_client.update_network(
              network['id'], **new_net_args)
          self.assertEqual(
              new_seg_id, network['provider:segmentation_id'])
          # Ensure that segmentation_id was really changed
          network = self.safe_client.client.show_network(
              network['id'])['network']
          self.assertEqual(new_seg_id, network['provider:segmentation_id'])
          return network
  
  
  class TestSegmentationId(BaseSegmentationIdTest):
  
      scenarios = [
          ('Open vSwitch Agent', {'l2_agent_type': constants.AGENT_TYPE_OVS}),
          ('Linux Bridge Agent', {
              'l2_agent_type': constants.AGENT_TYPE_LINUXBRIDGE})]
      num_hosts = 1
  
      def test_change_segmentation_id_no_ports_in_network(self):
          network = self._create_network()
          # Now change segmentation_id to some other value
          self._update_segmentation_id(network)
  
      def test_change_segmentation_id_with_unbound_ports_in_network(self):
          network = self._create_network()
  
          self.safe_client.create_subnet(
              self.project_id, network['id'], '20.0.0.0/24')
  
          # Unbound port
          self.safe_client.create_port(self.project_id, network['id'])
          # Port failed to bind
          self.safe_client.create_port(self.project_id, network['id'],
                                       "non-exisiting-host")
  
          self._update_segmentation_id(network)
  
      def test_change_segmentation_id_with_bound_ports_in_network(self):
          network = self._create_network()
  
          self.safe_client.create_subnet(
              self.project_id, network['id'], '20.0.0.0/24')
          self.safe_client.create_port(self.project_id, network['id'],
                                       self.environment.hosts[0].hostname)
  
          if self.l2_agent_type == constants.AGENT_TYPE_LINUXBRIDGE:
              # Linuxbridge agent don't support update of segmentation_id for
              # the network so this should raise an exception
              self.assertRaises(exceptions.BadRequest,
                                self._update_segmentation_id, network)
          else:
              self._update_segmentation_id(network)
  
  
  class TestSegmentationIdConnectivity(BaseSegmentationIdTest):
  
      scenarios = [
          ('Open vSwitch Agent', {'l2_agent_type': constants.AGENT_TYPE_OVS})]
  
      num_hosts = 2
  
      def _ensure_vlan_id_set_in_flows(self, vlan_id):
          for host in self.environment.hosts:
              l2_extensions.wait_for_mod_vlan_id_applied(host.br_phys, vlan_id)
  
      def test_connectivity_after_segmentation_id_update(self):
          network = self._create_network()
          self.safe_client.create_subnet(
              self.project_id, network['id'],
              cidr='10.0.0.0/24',
              gateway_ip='10.0.0.1',
              name='subnet-test',
              enable_dhcp=False)
  
          vms = self._prepare_vms_in_net(self.project_id, network, False)
          self._ensure_vlan_id_set_in_flows(network['provider:segmentation_id'])
          vms.ping_all()
  
          network = self._update_segmentation_id(network)
          self._ensure_vlan_id_set_in_flows(network['provider:segmentation_id'])
          vms.ping_all()
  