131 lines
5.8 KiB
Python
131 lines
5.8 KiB
Python
# Copyright (c) 2016 IBM Corp.
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#
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron_lib.api.definitions import portbindings
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from neutron_lib import constants
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from neutron_lib.plugins.ml2 import api
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from oslo_log import log
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from neutron.plugins.ml2.drivers.macvtap import macvtap_common
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from neutron.plugins.ml2.drivers import mech_agent
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LOG = log.getLogger(__name__)
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MACVTAP_MODE_BRIDGE = 'bridge'
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class MacvtapMechanismDriver(mech_agent.SimpleAgentMechanismDriverBase):
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"""Attach to networks using Macvtap L2 agent.
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The MacvtapMechanismDriver integrates the ml2 plugin with the
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macvtap L2 agent. Port binding with this driver requires the
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macvtap agent to be running on the port's host, and that agent
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to have connectivity to at least one segment of the port's
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network.
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"""
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def __init__(self):
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vif_details = {portbindings.CAP_PORT_FILTER: False,
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portbindings.VIF_DETAILS_CONNECTIVITY:
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portbindings.CONNECTIVITY_L2}
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super(MacvtapMechanismDriver, self).__init__(
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constants.AGENT_TYPE_MACVTAP,
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portbindings.VIF_TYPE_MACVTAP,
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vif_details)
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def get_allowed_network_types(self, agent):
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return [constants.TYPE_FLAT, constants.TYPE_VLAN]
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def get_mappings(self, agent):
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return agent['configurations'].get('interface_mappings', {})
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def check_vlan_transparency(self, context):
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"""Macvtap driver vlan transparency support."""
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return False
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def _is_live_migration(self, context):
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# We cannot just check if
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# context.original['host_id'] != context.current['host_id']
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# This condition is also true, if nova does a reschedule of a
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# instance when something went wrong during spawn. In this case,
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# context.original['host_id'] is set to the failed host.
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# The only safe way to detect a migration is to look into the binding
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# profiles 'migrating_to' attribute, which is set by Nova since patch
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# https://review.opendev.org/#/c/275073/.
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if not context.original:
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# new port
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return False
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port_profile = context.original.get(portbindings.PROFILE)
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if port_profile and port_profile.get('migrating_to', None):
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LOG.debug("Live migration with profile %s detected.", port_profile)
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return True
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else:
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return False
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def try_to_bind_segment_for_agent(self, context, segment, agent):
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if self.check_segment_for_agent(segment, agent):
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vif_details_segment = self.vif_details
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mappings = self.get_mappings(agent)
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interface = mappings[segment['physical_network']]
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network_type = segment[api.NETWORK_TYPE]
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if network_type == constants.TYPE_VLAN:
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vlan_id = segment[api.SEGMENTATION_ID]
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macvtap_src = macvtap_common.get_vlan_device_name(interface,
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vlan_id)
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vif_details_segment['vlan'] = vlan_id
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else:
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macvtap_src = interface
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if self._is_live_migration(context):
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# We can use the original port here, as during live migration
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# portbinding is done after the migration happened. Nova will
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# not do a reschedule of the instance migration if binding
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# fails, but just set the instance into error state.
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# Due to that we can be sure that the original port is the
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# migration source port.
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orig_vif_details = context.original[portbindings.VIF_DETAILS]
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orig_source = orig_vif_details[
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portbindings.VIF_DETAILS_MACVTAP_SOURCE]
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if orig_source != macvtap_src:
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source_host = context.original[portbindings.HOST_ID]
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target_host = agent['host']
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LOG.error("Vif binding denied by mechanism driver. "
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"MacVTap source device '%(target_dev)s' on "
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"the migration target '%(target_host)s'is "
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"not equal to device '%(source_dev)s' on "
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"the migration source '%(source_host)s. "
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"Make sure that the "
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"interface mapping of macvtap "
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"agent on both hosts is equal "
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"for the physical network '%(physnet)s'!",
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{'source_dev': orig_source,
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'target_dev': macvtap_src,
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'target_host': target_host,
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'source_host': source_host,
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'physnet': segment['physical_network']})
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return False
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vif_details_segment['physical_interface'] = interface
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vif_details_segment['macvtap_source'] = macvtap_src
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vif_details_segment['macvtap_mode'] = MACVTAP_MODE_BRIDGE
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LOG.debug("Macvtap vif_details added to context binding: %s",
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vif_details_segment)
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context.set_binding(segment[api.ID], self.vif_type,
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vif_details_segment)
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return True
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return False
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