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# Copyright (c) 2015 OpenStack Foundation
# 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
# 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 oslo_config import cfg
from oslo_log import log as logging
from neutron.agent.l2.extensions import qos
from neutron.plugins.ml2.drivers.openvswitch.mech_driver import (
LOG = logging.getLogger(__name__)
class QosOVSAgentDriver(qos.QosAgentDriver):
def __init__(self):
super(QosOVSAgentDriver, self).__init__()
self.br_int_name = cfg.CONF.OVS.integration_bridge
self.br_int = None
self.agent_api = None
def consume_api(self, agent_api):
self.agent_api = agent_api
def initialize(self):
self.br_int = self.agent_api.request_int_br()
self.cookie = self.br_int.default_cookie
def create_bandwidth_limit(self, port, rule):
self.update_bandwidth_limit(port, rule)
def update_bandwidth_limit(self, port, rule):
vif_port = port.get('vif_port')
if not vif_port:
port_id = port.get('port_id', None)
LOG.debug("update_bandwidth_limit was received for port %s but "
"vif_port was not found. It seems that port is already "
"deleted", port_id)
max_kbps = rule.max_kbps
# NOTE(slaweq): According to ovs docs:
# ovs accepts only integer values of burst:
max_burst_kbps = int(self._get_egress_burst_value(rule))
def delete_bandwidth_limit(self, port):
vif_port = port.get('vif_port')
if not vif_port:
port_id = port.get('port_id', None)
LOG.debug("delete_bandwidth_limit was received for port %s but "
"vif_port was not found. It seems that port is already "
"deleted", port_id)
def create_dscp_marking(self, port, rule):
self.update_dscp_marking(port, rule)
def update_dscp_marking(self, port, rule):
port_name = port['vif_port'].port_name
port = self.br_int.get_port_ofport(port_name)
mark = rule.dscp_mark
#mark needs to be bit shifted 2 left to not overwrite the
#lower 2 bits of type of service packet header.
#source: man ovs-ofctl (/mod_nw_tos)
mark = str(mark << 2)
# reg2 is a metadata field that does not alter packets.
# By loading a value into this field and checking if the value is
# altered it allows the packet to be resubmitted and go through
# the flow table again to be identified by other flows.
flows = self.br_int.dump_flows_for(cookie=self.cookie, table=0,
in_port=port, reg2=0)
if not flows:
actions = ("mod_nw_tos:" + mark + ",load:55->NXM_NX_REG2[0..5]," +
self.br_int.add_flow(in_port=port, table=0, priority=65535,
reg2=0, actions=actions)
for flow in flows:
actions = str(flow).partition("actions=")[2]
acts = actions.split(',')
# mod_nw_tos = modify type of service header
# This is the second byte of the IPv4 packet header.
# DSCP makes up the upper 6 bits of this header field.
actions = "mod_nw_tos:" + mark + ","
actions += ','.join([act for act in acts
if "mod_nw_tos:" not in act])
self.br_int.mod_flow(reg2=0, in_port=port, table=0,
def delete_dscp_marking(self, port):
port_name = port['vif_port'].port_name
port = self.br_int.get_port_ofport(port_name)
self.br_int.delete_flows(in_port=port, table=0, reg2=0)