text: # Copyright (c) 2016 Red Hat Inc.
  # All Rights Reserved.
  #
  #    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.api.definitions import portbindings
  from oslo_log import log as logging
  
  from neutron.common import constants
  from neutron.services.qos.drivers import base
  from neutron.services.qos import qos_consts
  
  LOG = logging.getLogger(__name__)
  
  DRIVER = None
  
  SUPPORTED_RULES = {
      qos_consts.RULE_TYPE_BANDWIDTH_LIMIT: {
          qos_consts.MAX_KBPS: {
              'type:range': [0, constants.DB_INTEGER_MAX_VALUE]},
          qos_consts.MAX_BURST: {
              'type:range': [0, constants.DB_INTEGER_MAX_VALUE]},
          qos_consts.DIRECTION: {
              'type:values': [constants.EGRESS_DIRECTION]}
      },
      qos_consts.RULE_TYPE_DSCP_MARKING: {
          qos_consts.DSCP_MARK: {'type:values': constants.VALID_DSCP_MARKS}
      }
  }
  
  
  class LinuxBridgeDriver(base.DriverBase):
  
      @staticmethod
      def create():
          return LinuxBridgeDriver(
              name='linuxbridge',
              vif_types=[portbindings.VIF_TYPE_BRIDGE],
              vnic_types=[portbindings.VNIC_NORMAL],
              supported_rules=SUPPORTED_RULES,
              requires_rpc_notifications=True)
  
  
  def register():
      """Register the driver."""
      global DRIVER
      if not DRIVER:
          DRIVER = LinuxBridgeDriver.create()
      LOG.debug('Linuxbridge QoS driver registered')
  