# Copyright 2014 Big Switch Networks, 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. import copy import datetime import httplib import eventlet from oslo.config import cfg from oslo.utils import excutils from oslo.utils import timeutils from neutron import context as ctx from neutron.extensions import portbindings from neutron.i18n import _LE, _LW from neutron.openstack.common import log from neutron.plugins.bigswitch import config as pl_config from neutron.plugins.bigswitch import plugin from neutron.plugins.bigswitch import servermanager from neutron.plugins.common import constants as pconst from neutron.plugins.ml2 import driver_api as api EXTERNAL_PORT_OWNER = 'neutron:external_port' LOG = log.getLogger(__name__) put_context_in_serverpool = plugin.put_context_in_serverpool # time in seconds to maintain existence of vswitch response CACHE_VSWITCH_TIME = 60 class BigSwitchMechanismDriver(plugin.NeutronRestProxyV2Base, api.MechanismDriver): """Mechanism Driver for Big Switch Networks Controller. This driver relays the network create, update, delete operations to the Big Switch Controller. """ def initialize(self): LOG.debug('Initializing driver') # register plugin config opts pl_config.register_config() self.evpool = eventlet.GreenPool(cfg.CONF.RESTPROXY.thread_pool_size) # init network ctrl connections self.servers = servermanager.ServerPool() self.servers.get_topo_function = self._get_all_data self.servers.get_topo_function_args = {'get_ports': True, 'get_floating_ips': False, 'get_routers': False} self.segmentation_types = ', '.join(cfg.CONF.ml2.type_drivers) # Track hosts running IVS to avoid excessive calls to the backend self.ivs_host_cache = {} LOG.debug("Initialization done") @put_context_in_serverpool def create_network_postcommit(self, context): # create network on the network controller self._send_create_network(context.current) @put_context_in_serverpool def update_network_postcommit(self, context): # update network on the network controller self._send_update_network(context.current) @put_context_in_serverpool def delete_network_postcommit(self, context): # delete network on the network controller self._send_delete_network(context.current) @put_context_in_serverpool def create_port_postcommit(self, context): # create port on the network controller port = self._prepare_port_for_controller(context) if port: self.async_port_create(port["network"]["tenant_id"], port["network"]["id"], port) @put_context_in_serverpool def update_port_postcommit(self, context): # update port on the network controller port = self._prepare_port_for_controller(context) if port: try: self.async_port_create(port["network"]["tenant_id"], port["network"]["id"], port) except servermanager.RemoteRestError as e: with excutils.save_and_reraise_exception() as ctxt: if (cfg.CONF.RESTPROXY.auto_sync_on_failure and e.status == httplib.NOT_FOUND and servermanager.NXNETWORK in e.reason): ctxt.reraise = False LOG.error(_LE("Inconsistency with backend controller " "triggering full synchronization.")) topoargs = self.servers.get_topo_function_args self._send_all_data( send_ports=topoargs['get_ports'], send_floating_ips=topoargs['get_floating_ips'], send_routers=topoargs['get_routers'], triggered_by_tenant=port["network"]["tenant_id"] ) @put_context_in_serverpool def delete_port_postcommit(self, context): # delete port on the network controller port = context.current net = context.network.current self.servers.rest_delete_port(net["tenant_id"], net["id"], port['id']) def _prepare_port_for_controller(self, context): # make a copy so the context isn't changed for other drivers port = copy.deepcopy(context.current) net = context.network.current port['network'] = net port['bound_segment'] = context.bound_segment actx = ctx.get_admin_context() prepped_port = self._extend_port_dict_binding(actx, port) prepped_port = self._map_state_and_status(prepped_port) if (portbindings.HOST_ID not in prepped_port or prepped_port[portbindings.HOST_ID] == ''): LOG.warning(_LW("Ignoring port notification to controller because " "of missing host ID.")) # in ML2, controller doesn't care about ports without # the host_id set return False return prepped_port def bind_port(self, context): """Marks ports as bound. Binds external ports and IVS ports. Fabric configuration will occur on the subsequent port update. Currently only vlan segments are supported. """ if context.current['device_owner'] == EXTERNAL_PORT_OWNER: # TODO(kevinbenton): check controller to see if the port exists # so this driver can be run in parallel with others that add # support for external port bindings for segment in context.network.network_segments: if segment[api.NETWORK_TYPE] == pconst.TYPE_VLAN: context.set_binding( segment[api.ID], portbindings.VIF_TYPE_BRIDGE, {portbindings.CAP_PORT_FILTER: False, portbindings.OVS_HYBRID_PLUG: False}) return # IVS hosts will have a vswitch with the same name as the hostname if self.does_vswitch_exist(context.host): for segment in context.network.network_segments: if segment[api.NETWORK_TYPE] == pconst.TYPE_VLAN: context.set_binding( segment[api.ID], portbindings.VIF_TYPE_IVS, {portbindings.CAP_PORT_FILTER: True, portbindings.OVS_HYBRID_PLUG: False}) def does_vswitch_exist(self, host): """Check if Indigo vswitch exists with the given hostname. Returns True if switch exists on backend. Returns False if switch does not exist. Returns None if backend could not be reached. Caches response from backend. """ try: return self._get_cached_vswitch_existence(host) except ValueError: # cache was empty for that switch or expired pass try: self.servers.rest_get_switch(host) exists = True except servermanager.RemoteRestError as e: if e.status == 404: exists = False else: # Another error, return without caching to try again on # next binding return self.ivs_host_cache[host] = { 'timestamp': datetime.datetime.now(), 'exists': exists } return exists def _get_cached_vswitch_existence(self, host): """Returns cached existence. Old and non-cached raise ValueError.""" entry = self.ivs_host_cache.get(host) if not entry: raise ValueError(_('No cache entry for host %s') % host) diff = timeutils.delta_seconds(entry['timestamp'], datetime.datetime.now()) if diff > CACHE_VSWITCH_TIME: self.ivs_host_cache.pop(host) raise ValueError(_('Expired cache entry for host %s') % host) return entry['exists']