/
vif.py
759 lines (625 loc) · 29.3 KB
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vif.py
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# Copyright (C) 2011 Midokura KK
# Copyright (C) 2011 Nicira, Inc
# Copyright 2011 OpenStack Foundation
# 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.
"""VIF drivers for libvirt."""
import copy
from oslo.config import cfg
from nova import exception
from nova.i18n import _
from nova.i18n import _LE
from nova.network import linux_net
from nova.network import model as network_model
from nova.openstack.common import log as logging
from nova.openstack.common import processutils
from nova import utils
from nova.virt.libvirt import config as vconfig
from nova.virt.libvirt import designer
LOG = logging.getLogger(__name__)
libvirt_vif_opts = [
cfg.BoolOpt('use_virtio_for_bridges',
default=True,
help='Use virtio for bridge interfaces with KVM/QEMU'),
]
CONF = cfg.CONF
CONF.register_opts(libvirt_vif_opts, 'libvirt')
CONF.import_opt('virt_type', 'nova.virt.libvirt.driver', group='libvirt')
CONF.import_opt('use_ipv6', 'nova.netconf')
# Since libvirt 0.9.11, <interface type='bridge'>
# supports OpenVSwitch natively.
LIBVIRT_OVS_VPORT_VERSION = 9011
DEV_PREFIX_ETH = 'eth'
def is_vif_model_valid_for_virt(virt_type, vif_model):
valid_models = {
'qemu': [network_model.VIF_MODEL_VIRTIO,
network_model.VIF_MODEL_NE2K_PCI,
network_model.VIF_MODEL_PCNET,
network_model.VIF_MODEL_RTL8139,
network_model.VIF_MODEL_E1000],
'kvm': [network_model.VIF_MODEL_VIRTIO,
network_model.VIF_MODEL_NE2K_PCI,
network_model.VIF_MODEL_PCNET,
network_model.VIF_MODEL_RTL8139,
network_model.VIF_MODEL_E1000],
'xen': [network_model.VIF_MODEL_NETFRONT,
network_model.VIF_MODEL_NE2K_PCI,
network_model.VIF_MODEL_PCNET,
network_model.VIF_MODEL_RTL8139,
network_model.VIF_MODEL_E1000],
'lxc': [],
'uml': [],
}
if vif_model is None:
return True
if virt_type not in valid_models:
raise exception.UnsupportedVirtType(virt=virt_type)
return vif_model in valid_models[virt_type]
class LibvirtBaseVIFDriver(object):
def __init__(self, get_connection):
self.get_connection = get_connection
self.libvirt_version = None
def _normalize_vif_type(self, vif_type):
return vif_type.replace('2.1q', '2q')
def has_libvirt_version(self, want):
if self.libvirt_version is None:
conn = self.get_connection()
self.libvirt_version = conn.getLibVersion()
if self.libvirt_version >= want:
return True
return False
def get_vif_devname(self, vif):
if 'devname' in vif:
return vif['devname']
return ("nic" + vif['id'])[:network_model.NIC_NAME_LEN]
def get_vif_devname_with_prefix(self, vif, prefix):
devname = self.get_vif_devname(vif)
return prefix + devname[3:]
def get_config(self, instance, vif, image_meta, inst_type):
conf = vconfig.LibvirtConfigGuestInterface()
# Default to letting libvirt / the hypervisor choose the model
model = None
driver = None
# If the user has specified a 'vif_model' against the
# image then honour that model
if image_meta:
vif_model = image_meta.get('properties',
{}).get('hw_vif_model')
if vif_model is not None:
model = vif_model
# Else if the virt type is KVM/QEMU, use virtio according
# to the global config parameter
if (model is None and
CONF.libvirt.virt_type in ('kvm', 'qemu') and
CONF.libvirt.use_virtio_for_bridges):
model = network_model.VIF_MODEL_VIRTIO
# Workaround libvirt bug, where it mistakenly
# enables vhost mode, even for non-KVM guests
if (model == network_model.VIF_MODEL_VIRTIO and
CONF.libvirt.virt_type == "qemu"):
driver = "qemu"
if not is_vif_model_valid_for_virt(CONF.libvirt.virt_type,
model):
raise exception.UnsupportedHardware(model=model,
virt=CONF.libvirt.virt_type)
designer.set_vif_guest_frontend_config(
conf, vif['address'], model, driver)
return conf
def plug(self, instance, vif):
pass
def unplug(self, instance, vif):
pass
class LibvirtGenericVIFDriver(LibvirtBaseVIFDriver):
"""Generic VIF driver for libvirt networking."""
def get_bridge_name(self, vif):
return vif['network']['bridge']
def get_ovs_interfaceid(self, vif):
return vif.get('ovs_interfaceid') or vif['id']
def get_br_name(self, iface_id):
return ("qbr" + iface_id)[:network_model.NIC_NAME_LEN]
def get_veth_pair_names(self, iface_id):
return (("qvb%s" % iface_id)[:network_model.NIC_NAME_LEN],
("qvo%s" % iface_id)[:network_model.NIC_NAME_LEN])
def get_firewall_required(self, vif):
if vif.is_neutron_filtering_enabled():
return False
if CONF.firewall_driver != "nova.virt.firewall.NoopFirewallDriver":
return True
return False
def get_config_bridge(self, instance, vif, image_meta, inst_type):
"""Get VIF configurations for bridge type."""
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
designer.set_vif_host_backend_bridge_config(
conf, self.get_bridge_name(vif),
self.get_vif_devname(vif))
mac_id = vif['address'].replace(':', '')
name = "nova-instance-" + instance['name'] + "-" + mac_id
if self.get_firewall_required(vif):
conf.filtername = name
designer.set_vif_bandwidth_config(conf, inst_type)
return conf
def get_config_ovs_ethernet(self, instance, vif,
image_meta, inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
dev = self.get_vif_devname(vif)
designer.set_vif_host_backend_ethernet_config(conf, dev)
return conf
def get_config_ovs_bridge(self, instance, vif, image_meta,
inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
designer.set_vif_host_backend_ovs_config(
conf, self.get_bridge_name(vif),
self.get_ovs_interfaceid(vif),
self.get_vif_devname(vif))
designer.set_vif_bandwidth_config(conf, inst_type)
return conf
def get_config_ovs_hybrid(self, instance, vif, image_meta,
inst_type):
newvif = copy.deepcopy(vif)
newvif['network']['bridge'] = self.get_br_name(vif['id'])
return self.get_config_bridge(instance, newvif,
image_meta, inst_type)
def get_config_ovs(self, instance, vif, image_meta, inst_type):
if self.get_firewall_required(vif) or vif.is_hybrid_plug_enabled():
return self.get_config_ovs_hybrid(instance, vif,
image_meta,
inst_type)
elif self.has_libvirt_version(LIBVIRT_OVS_VPORT_VERSION):
return self.get_config_ovs_bridge(instance, vif,
image_meta,
inst_type)
else:
return self.get_config_ovs_ethernet(instance, vif,
image_meta,
inst_type)
def get_config_ivs_hybrid(self, instance, vif, image_meta,
inst_type):
newvif = copy.deepcopy(vif)
newvif['network']['bridge'] = self.get_br_name(vif['id'])
return self.get_config_bridge(instance,
newvif,
image_meta,
inst_type)
def get_config_ivs_ethernet(self, instance, vif, image_meta,
inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance,
vif,
image_meta,
inst_type)
dev = self.get_vif_devname(vif)
designer.set_vif_host_backend_ethernet_config(conf, dev)
return conf
def get_config_ivs(self, instance, vif, image_meta, inst_type):
if self.get_firewall_required(vif) or vif.is_hybrid_plug_enabled():
return self.get_config_ivs_hybrid(instance, vif,
image_meta,
inst_type)
else:
return self.get_config_ivs_ethernet(instance, vif,
image_meta,
inst_type)
def get_config_802qbg(self, instance, vif, image_meta,
inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
params = vif["qbg_params"]
designer.set_vif_host_backend_802qbg_config(
conf, vif['network'].get_meta('interface'),
params['managerid'],
params['typeid'],
params['typeidversion'],
params['instanceid'])
designer.set_vif_bandwidth_config(conf, inst_type)
return conf
def get_config_802qbh(self, instance, vif, image_meta,
inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
params = vif["qbh_params"]
designer.set_vif_host_backend_802qbh_config(
conf, vif['network'].get_meta('interface'),
params['profileid'])
designer.set_vif_bandwidth_config(conf, inst_type)
return conf
def get_config_iovisor(self, instance, vif, image_meta,
inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
dev = self.get_vif_devname(vif)
designer.set_vif_host_backend_ethernet_config(conf, dev)
designer.set_vif_bandwidth_config(conf, inst_type)
return conf
def get_config_midonet(self, instance, vif, image_meta,
inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
dev = self.get_vif_devname(vif)
designer.set_vif_host_backend_ethernet_config(conf, dev)
return conf
def get_config_mlnx_direct(self, instance, vif, image_meta,
inst_type):
conf = super(LibvirtGenericVIFDriver,
self).get_config(instance, vif,
image_meta, inst_type)
devname = self.get_vif_devname_with_prefix(vif, DEV_PREFIX_ETH)
designer.set_vif_host_backend_direct_config(conf, devname)
designer.set_vif_bandwidth_config(conf, inst_type)
return conf
def get_config(self, instance, vif, image_meta, inst_type):
vif_type = vif['type']
LOG.debug('vif_type=%(vif_type)s instance=%(instance)s '
'vif=%(vif)s',
{'vif_type': vif_type, 'instance': instance,
'vif': vif})
if vif_type is None:
raise exception.NovaException(
_("vif_type parameter must be present "
"for this vif_driver implementation"))
vif_slug = self._normalize_vif_type(vif_type)
func = getattr(self, 'get_config_%s' % vif_slug, None)
if not func:
raise exception.NovaException(
_("Unexpected vif_type=%s") % vif_type)
return func(instance, vif, image_meta, inst_type)
def plug_bridge(self, instance, vif):
"""Ensure that the bridge exists, and add VIF to it."""
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
network = vif['network']
if (not network.get_meta('multi_host', False) and
network.get_meta('should_create_bridge', False)):
if network.get_meta('should_create_vlan', False):
iface = CONF.vlan_interface or \
network.get_meta('bridge_interface')
LOG.debug('Ensuring vlan %(vlan)s and bridge %(bridge)s',
{'vlan': network.get_meta('vlan'),
'bridge': self.get_bridge_name(vif)},
instance=instance)
linux_net.LinuxBridgeInterfaceDriver.ensure_vlan_bridge(
network.get_meta('vlan'),
self.get_bridge_name(vif),
iface)
else:
iface = CONF.flat_interface or \
network.get_meta('bridge_interface')
LOG.debug("Ensuring bridge %s",
self.get_bridge_name(vif), instance=instance)
linux_net.LinuxBridgeInterfaceDriver.ensure_bridge(
self.get_bridge_name(vif),
iface)
def plug_ovs_ethernet(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
iface_id = self.get_ovs_interfaceid(vif)
dev = self.get_vif_devname(vif)
linux_net.create_tap_dev(dev)
linux_net.create_ovs_vif_port(self.get_bridge_name(vif),
dev, iface_id, vif['address'],
instance['uuid'])
def plug_ovs_bridge(self, instance, vif):
"""No manual plugging required."""
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
def plug_ovs_hybrid(self, instance, vif):
"""Plug using hybrid strategy
Create a per-VIF linux bridge, then link that bridge to the OVS
integration bridge via a veth device, setting up the other end
of the veth device just like a normal OVS port. Then boot the
VIF on the linux bridge using standard libvirt mechanisms.
"""
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
iface_id = self.get_ovs_interfaceid(vif)
br_name = self.get_br_name(vif['id'])
v1_name, v2_name = self.get_veth_pair_names(vif['id'])
if not linux_net.device_exists(br_name):
utils.execute('brctl', 'addbr', br_name, run_as_root=True)
utils.execute('brctl', 'setfd', br_name, 0, run_as_root=True)
utils.execute('brctl', 'stp', br_name, 'off', run_as_root=True)
utils.execute('tee',
('/sys/class/net/%s/bridge/multicast_snooping' %
br_name),
process_input='0',
run_as_root=True,
check_exit_code=[0, 1])
if not linux_net.device_exists(v2_name):
linux_net._create_veth_pair(v1_name, v2_name)
utils.execute('ip', 'link', 'set', br_name, 'up', run_as_root=True)
utils.execute('brctl', 'addif', br_name, v1_name, run_as_root=True)
linux_net.create_ovs_vif_port(self.get_bridge_name(vif),
v2_name, iface_id, vif['address'],
instance['uuid'])
def plug_ovs(self, instance, vif):
if self.get_firewall_required(vif) or vif.is_hybrid_plug_enabled():
self.plug_ovs_hybrid(instance, vif)
elif self.has_libvirt_version(LIBVIRT_OVS_VPORT_VERSION):
self.plug_ovs_bridge(instance, vif)
else:
self.plug_ovs_ethernet(instance, vif)
def plug_ivs_ethernet(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
iface_id = self.get_ovs_interfaceid(vif)
dev = self.get_vif_devname(vif)
linux_net.create_tap_dev(dev)
linux_net.create_ivs_vif_port(dev, iface_id, vif['address'],
instance['uuid'])
def plug_ivs_hybrid(self, instance, vif):
"""Plug using hybrid strategy (same as OVS)
Create a per-VIF linux bridge, then link that bridge to the OVS
integration bridge via a veth device, setting up the other end
of the veth device just like a normal IVS port. Then boot the
VIF on the linux bridge using standard libvirt mechanisms.
"""
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
iface_id = self.get_ovs_interfaceid(vif)
br_name = self.get_br_name(vif['id'])
v1_name, v2_name = self.get_veth_pair_names(vif['id'])
if not linux_net.device_exists(br_name):
utils.execute('brctl', 'addbr', br_name, run_as_root=True)
utils.execute('brctl', 'setfd', br_name, 0, run_as_root=True)
utils.execute('brctl', 'stp', br_name, 'off', run_as_root=True)
utils.execute('tee',
('/sys/class/net/%s/bridge/multicast_snooping' %
br_name),
process_input='0',
run_as_root=True,
check_exit_code=[0, 1])
if not linux_net.device_exists(v2_name):
linux_net._create_veth_pair(v1_name, v2_name)
utils.execute('ip', 'link', 'set', br_name, 'up', run_as_root=True)
utils.execute('brctl', 'addif', br_name, v1_name, run_as_root=True)
linux_net.create_ivs_vif_port(v2_name, iface_id, vif['address'],
instance['uuid'])
def plug_ivs(self, instance, vif):
if self.get_firewall_required(vif) or vif.is_hybrid_plug_enabled():
self.plug_ivs_hybrid(instance, vif)
else:
self.plug_ivs_ethernet(instance, vif)
def plug_mlnx_direct(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
vnic_mac = vif['address']
device_id = instance['uuid']
fabric = vif.get_physical_network()
if not fabric:
raise exception.NetworkMissingPhysicalNetwork(
network_uuid=vif['network']['id'])
dev_name = self.get_vif_devname_with_prefix(vif, DEV_PREFIX_ETH)
try:
utils.execute('ebrctl', 'add-port', vnic_mac, device_id, fabric,
network_model.VIF_TYPE_MLNX_DIRECT, dev_name,
run_as_root=True)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while plugging vif"), instance=instance)
def plug_802qbg(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
def plug_802qbh(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
def plug_midonet(self, instance, vif):
"""Plug into MidoNet's network port
Bind the vif to a MidoNet virtual port.
"""
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
dev = self.get_vif_devname(vif)
port_id = vif['id']
try:
linux_net.create_tap_dev(dev)
utils.execute('mm-ctl', '--bind-port', port_id, dev,
run_as_root=True)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while plugging vif"), instance=instance)
def plug_iovisor(self, instance, vif):
"""Plug using PLUMgrid IO Visor Driver
Connect a network device to their respective
Virtual Domain in PLUMgrid Platform.
"""
super(LibvirtGenericVIFDriver,
self).plug(instance, vif)
dev = self.get_vif_devname(vif)
iface_id = vif['id']
linux_net.create_tap_dev(dev)
net_id = vif['network']['id']
tenant_id = instance["project_id"]
try:
utils.execute('ifc_ctl', 'gateway', 'add_port', dev,
run_as_root=True)
utils.execute('ifc_ctl', 'gateway', 'ifup', dev,
'access_vm',
vif['network']['label'] + "_" + iface_id,
vif['address'], 'pgtag2=%s' % net_id,
'pgtag1=%s' % tenant_id, run_as_root=True)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while plugging vif"), instance=instance)
def plug(self, instance, vif):
vif_type = vif['type']
LOG.debug('vif_type=%(vif_type)s instance=%(instance)s '
'vif=%(vif)s',
{'vif_type': vif_type, 'instance': instance,
'vif': vif})
if vif_type is None:
raise exception.NovaException(
_("vif_type parameter must be present "
"for this vif_driver implementation"))
vif_slug = self._normalize_vif_type(vif_type)
func = getattr(self, 'plug_%s' % vif_slug, None)
if not func:
raise exception.NovaException(
_("Unexpected vif_type=%s") % vif_type)
func(instance, vif)
def unplug_bridge(self, instance, vif):
"""No manual unplugging required."""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
def unplug_ovs_ethernet(self, instance, vif):
"""Unplug the VIF by deleting the port from the bridge."""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
try:
linux_net.delete_ovs_vif_port(self.get_bridge_name(vif),
self.get_vif_devname(vif))
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while unplugging vif"),
instance=instance)
def unplug_ovs_bridge(self, instance, vif):
"""No manual unplugging required."""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
def unplug_ovs_hybrid(self, instance, vif):
"""UnPlug using hybrid strategy
Unhook port from OVS, unhook port from bridge, delete
bridge, and delete both veth devices.
"""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
try:
br_name = self.get_br_name(vif['id'])
v1_name, v2_name = self.get_veth_pair_names(vif['id'])
if linux_net.device_exists(br_name):
utils.execute('brctl', 'delif', br_name, v1_name,
run_as_root=True)
utils.execute('ip', 'link', 'set', br_name, 'down',
run_as_root=True)
utils.execute('brctl', 'delbr', br_name,
run_as_root=True)
linux_net.delete_ovs_vif_port(self.get_bridge_name(vif),
v2_name)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while unplugging vif"),
instance=instance)
def unplug_ovs(self, instance, vif):
if self.get_firewall_required(vif) or vif.is_hybrid_plug_enabled():
self.unplug_ovs_hybrid(instance, vif)
elif self.has_libvirt_version(LIBVIRT_OVS_VPORT_VERSION):
self.unplug_ovs_bridge(instance, vif)
else:
self.unplug_ovs_ethernet(instance, vif)
def unplug_ivs_ethernet(self, instance, vif):
"""Unplug the VIF by deleting the port from the bridge."""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
try:
linux_net.delete_ivs_vif_port(self.get_vif_devname(vif))
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while unplugging vif"),
instance=instance)
def unplug_ivs_hybrid(self, instance, vif):
"""UnPlug using hybrid strategy (same as OVS)
Unhook port from IVS, unhook port from bridge, delete
bridge, and delete both veth devices.
"""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
try:
br_name = self.get_br_name(vif['id'])
v1_name, v2_name = self.get_veth_pair_names(vif['id'])
utils.execute('brctl', 'delif', br_name, v1_name, run_as_root=True)
utils.execute('ip', 'link', 'set', br_name, 'down',
run_as_root=True)
utils.execute('brctl', 'delbr', br_name, run_as_root=True)
linux_net.delete_ivs_vif_port(v2_name)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while unplugging vif"),
instance=instance)
def unplug_ivs(self, instance, vif):
if self.get_firewall_required(vif) or vif.is_hybrid_plug_enabled():
self.unplug_ivs_hybrid(instance, vif)
else:
self.unplug_ivs_ethernet(instance, vif)
def unplug_mlnx_direct(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
vnic_mac = vif['address']
fabric = vif.get_physical_network()
if not fabric:
raise exception.NetworkMissingPhysicalNetwork(
network_uuid=vif['network']['id'])
try:
utils.execute('ebrctl', 'del-port', fabric,
vnic_mac, run_as_root=True)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while unplugging vif"),
instance=instance)
def unplug_802qbg(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
def unplug_802qbh(self, instance, vif):
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
def unplug_midonet(self, instance, vif):
"""Unplug from MidoNet network port
Unbind the vif from a MidoNet virtual port.
"""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
dev = self.get_vif_devname(vif)
port_id = vif['id']
try:
utils.execute('mm-ctl', '--unbind-port', port_id,
run_as_root=True)
linux_net.delete_net_dev(dev)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while unplugging vif"),
instance=instance)
def unplug_iovisor(self, instance, vif):
"""Unplug using PLUMgrid IO Visor Driver
Delete network device and to their respective
connection to the Virtual Domain in PLUMgrid Platform.
"""
super(LibvirtGenericVIFDriver,
self).unplug(instance, vif)
iface_id = vif['id']
dev = self.get_vif_devname(vif)
try:
utils.execute('ifc_ctl', 'gateway', 'ifdown',
dev, 'access_vm',
vif['network']['label'] + "_" + iface_id,
vif['address'], run_as_root=True)
utils.execute('ifc_ctl', 'gateway', 'del_port', dev,
run_as_root=True)
linux_net.delete_net_dev(dev)
except processutils.ProcessExecutionError:
LOG.exception(_LE("Failed while unplugging vif"),
instance=instance)
def unplug(self, instance, vif):
vif_type = vif['type']
LOG.debug('vif_type=%(vif_type)s instance=%(instance)s '
'vif=%(vif)s',
{'vif_type': vif_type, 'instance': instance,
'vif': vif})
if vif_type is None:
raise exception.NovaException(
_("vif_type parameter must be present "
"for this vif_driver implementation"))
vif_slug = self._normalize_vif_type(vif_type)
func = getattr(self, 'unplug_%s' % vif_slug, None)
if not func:
raise exception.NovaException(
_("Unexpected vif_type=%s") % vif_type)
func(instance, vif)