OpenStack Networking (Neutron)
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# Copyright (c) 2015 Mellanox Technologies, Ltd
# 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.
import abc
import collections
from neutron_lib import exceptions
from oslo_concurrency import lockutils
from oslo_log import log as logging
import six
from neutron._i18n import _LW, _LI
from neutron.agent.l2 import agent_extension
from neutron.agent.linux import tc_lib
from neutron.api.rpc.callbacks.consumer import registry
from neutron.api.rpc.callbacks import events
from neutron.api.rpc.callbacks import resources
from neutron.api.rpc.handlers import resources_rpc
from neutron import manager
LOG = logging.getLogger(__name__)
@six.add_metaclass(abc.ABCMeta)
class QosAgentDriver(object):
"""Defines stable abstract interface for QoS Agent Driver.
QoS Agent driver defines the interface to be implemented by Agent
for applying QoS Rules on a port.
"""
# Each QoS driver should define the set of rule types that it supports, and
# corresponding handlers that has the following names:
#
# create_<type>
# update_<type>
# delete_<type>
#
# where <type> is one of VALID_RULE_TYPES
SUPPORTED_RULES = set()
@abc.abstractmethod
def initialize(self):
"""Perform QoS agent driver initialization.
"""
def create(self, port, qos_policy):
"""Apply QoS rules on port for the first time.
:param port: port object.
:param qos_policy: the QoS policy to be applied on port.
"""
self._handle_update_create_rules('create', port, qos_policy)
def consume_api(self, agent_api):
"""Consume the AgentAPI instance from the QoSAgentExtension class
This allows QosAgentDrivers to gain access to resources limited to the
NeutronAgent when this method is overridden.
:param agent_api: An instance of an agent specific API
"""
def update(self, port, qos_policy):
"""Apply QoS rules on port.
:param port: port object.
:param qos_policy: the QoS policy to be applied on port.
"""
self._handle_update_create_rules('update', port, qos_policy)
def delete(self, port, qos_policy=None):
"""Remove QoS rules from port.
:param port: port object.
:param qos_policy: the QoS policy to be removed from port.
"""
if qos_policy is None:
rule_types = self.SUPPORTED_RULES
else:
rule_types = set(
[rule.rule_type
for rule in self._iterate_rules(qos_policy.rules)])
for rule_type in rule_types:
self._handle_rule_delete(port, rule_type)
def _iterate_rules(self, rules):
for rule in rules:
rule_type = rule.rule_type
if rule_type in self.SUPPORTED_RULES:
yield rule
else:
LOG.warning(_LW('Unsupported QoS rule type for %(rule_id)s: '
'%(rule_type)s; skipping'),
{'rule_id': rule.id, 'rule_type': rule_type})
def _handle_rule_delete(self, port, rule_type):
handler_name = "".join(("delete_", rule_type))
handler = getattr(self, handler_name)
handler(port)
def _handle_update_create_rules(self, action, port, qos_policy):
for rule in self._iterate_rules(qos_policy.rules):
if rule.should_apply_to_port(port):
handler_name = "".join((action, "_", rule.rule_type))
handler = getattr(self, handler_name)
handler(port, rule)
else:
LOG.debug("Port %(port)s excluded from QoS rule %(rule)s",
{'port': port, 'rule': rule.id})
def _get_egress_burst_value(self, rule):
"""Return burst value used for egress bandwidth limitation.
Because Egress bw_limit is done on ingress qdisc by LB and ovs drivers
so it will return burst_value used by tc on as ingress_qdisc.
"""
return tc_lib.TcCommand.get_ingress_qdisc_burst_value(
rule.max_kbps, rule.max_burst_kbps)
class PortPolicyMap(object):
def __init__(self):
# we cannot use a dict of sets here because port dicts are not hashable
self.qos_policy_ports = collections.defaultdict(dict)
self.known_policies = {}
self.port_policies = {}
def get_ports(self, policy):
return self.qos_policy_ports[policy.id].values()
def get_policy(self, policy_id):
return self.known_policies.get(policy_id)
def update_policy(self, policy):
self.known_policies[policy.id] = policy
def has_policy_changed(self, port, policy_id):
return self.port_policies.get(port['port_id']) != policy_id
def get_port_policy(self, port):
policy_id = self.port_policies.get(port['port_id'])
if policy_id:
return self.get_policy(policy_id)
def set_port_policy(self, port, policy):
"""Attach a port to policy and return any previous policy on port."""
port_id = port['port_id']
old_policy = self.get_port_policy(port)
self.known_policies[policy.id] = policy
self.port_policies[port_id] = policy.id
self.qos_policy_ports[policy.id][port_id] = port
if old_policy and old_policy.id != policy.id:
del self.qos_policy_ports[old_policy.id][port_id]
return old_policy
def clean_by_port(self, port):
"""Detach port from policy and cleanup data we don't need anymore."""
port_id = port['port_id']
if port_id in self.port_policies:
del self.port_policies[port_id]
for qos_policy_id, port_dict in self.qos_policy_ports.items():
if port_id in port_dict:
del port_dict[port_id]
if not port_dict:
self._clean_policy_info(qos_policy_id)
return
raise exceptions.PortNotFound(port_id=port['port_id'])
def _clean_policy_info(self, qos_policy_id):
del self.qos_policy_ports[qos_policy_id]
del self.known_policies[qos_policy_id]
class QosAgentExtension(agent_extension.AgentCoreResourceExtension):
SUPPORTED_RESOURCES = [resources.QOS_POLICY]
def initialize(self, connection, driver_type):
"""Perform Agent Extension initialization.
"""
self.resource_rpc = resources_rpc.ResourcesPullRpcApi()
self.qos_driver = manager.NeutronManager.load_class_for_provider(
'neutron.qos.agent_drivers', driver_type)()
self.qos_driver.consume_api(self.agent_api)
self.qos_driver.initialize()
self.policy_map = PortPolicyMap()
registry.subscribe(self._handle_notification, resources.QOS_POLICY)
self._register_rpc_consumers(connection)
def consume_api(self, agent_api):
self.agent_api = agent_api
def _register_rpc_consumers(self, connection):
endpoints = [resources_rpc.ResourcesPushRpcCallback()]
for resource_type in self.SUPPORTED_RESOURCES:
# we assume that neutron-server always broadcasts the latest
# version known to the agent
topic = resources_rpc.resource_type_versioned_topic(resource_type)
connection.create_consumer(topic, endpoints, fanout=True)
@lockutils.synchronized('qos-port')
def _handle_notification(self, qos_policy, event_type):
# server does not allow to remove a policy that is attached to any
# port, so we ignore DELETED events. Also, if we receive a CREATED
# event for a policy, it means that there are no ports so far that are
# attached to it. That's why we are interested in UPDATED events only
if event_type == events.UPDATED:
self._process_update_policy(qos_policy)
@lockutils.synchronized('qos-port')
def handle_port(self, context, port):
"""Handle agent QoS extension for port.
This method applies a new policy to a port using the QoS driver.
Update events are handled in _handle_notification.
"""
port_id = port['port_id']
port_qos_policy_id = port.get('qos_policy_id')
network_qos_policy_id = port.get('network_qos_policy_id')
qos_policy_id = port_qos_policy_id or network_qos_policy_id
if qos_policy_id is None:
self._process_reset_port(port)
return
if not self.policy_map.has_policy_changed(port, qos_policy_id):
return
qos_policy = self.resource_rpc.pull(
context, resources.QOS_POLICY, qos_policy_id)
if qos_policy is None:
LOG.info(_LI("QoS policy %(qos_policy_id)s applied to port "
"%(port_id)s is not available on server, "
"it has been deleted. Skipping."),
{'qos_policy_id': qos_policy_id, 'port_id': port_id})
self._process_reset_port(port)
else:
old_qos_policy = self.policy_map.set_port_policy(port, qos_policy)
if old_qos_policy:
self.qos_driver.delete(port, old_qos_policy)
self.qos_driver.update(port, qos_policy)
else:
self.qos_driver.create(port, qos_policy)
def delete_port(self, context, port):
self._process_reset_port(port)
def _policy_rules_modified(self, old_policy, policy):
return not (len(old_policy.rules) == len(policy.rules) and
all(i in old_policy.rules for i in policy.rules))
def _process_update_policy(self, qos_policy):
old_qos_policy = self.policy_map.get_policy(qos_policy.id)
if old_qos_policy:
if self._policy_rules_modified(old_qos_policy, qos_policy):
for port in self.policy_map.get_ports(qos_policy):
#NOTE(QoS): for now, just reflush the rules on the port.
# Later, we may want to apply the difference
# between the old and new rule lists.
self.qos_driver.delete(port, old_qos_policy)
self.qos_driver.update(port, qos_policy)
self.policy_map.update_policy(qos_policy)
def _process_reset_port(self, port):
try:
self.policy_map.clean_by_port(port)
self.qos_driver.delete(port)
except exceptions.PortNotFound:
LOG.info(_LI("QoS extension did have no information about the "
"port %s that we were trying to reset"),
port['port_id'])