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OpenStack Study: mech_mlnx.py

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# 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.

from oslo.config import cfg

from neutron.common import constants

from neutron.extensions import portbindings

from neutron.openstack.common import jsonutils

from neutron.openstack.common import log

from neutron.plugins.ml2 import driver_api as api

from neutron.plugins.ml2.drivers import mech_agent

from neutron.plugins.ml2.drivers.mlnx import config # noqa

LOG = log.getLogger(__name__)

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class MlnxMechanismDriver(mech_agent.SimpleAgentMechanismDriverBase):

"""Attach to networks using Mellanox eSwitch L2 agent.

The MellanoxMechanismDriver integrates the ml2 plugin with the

Mellanox eswitch L2 agent. Port binding with this driver requires the

Mellanox eswitch agent to be running on the port's host, and that agent

to have connectivity to at least one segment of the port's

network.

"""

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def __init__(self):

# REVISIT(irenab): update supported_vnic_types to contain

# only VNIC_DIRECT and VNIC_MACVTAP once its possible to specify

# vnic_type via nova API/GUI. Currently VNIC_NORMAL is included

# to enable VM creation via GUI. It should be noted, that if

# several MDs are capable to bing bind port on chosen host, the

# first listed MD will bind the port for VNIC_NORMAL.

super(MlnxMechanismDriver, self).__init__(

constants.AGENT_TYPE_MLNX,

cfg.CONF.ESWITCH.vnic_type,

{portbindings.CAP_PORT_FILTER: False},

portbindings.VNIC_TYPES)

self.update_profile = cfg.CONF.ESWITCH.apply_profile_patch

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def check_segment_for_agent(self, segment, agent):

mappings = agent['configurations'].get('interface_mappings', {})

LOG.debug(_("Checking segment: %(segment)s "

"for mappings: %(mappings)s "),

{'segment': segment, 'mappings': mappings})

network_type = segment[api.NETWORK_TYPE]

if network_type == 'local':

return True

elif network_type in ['flat', 'vlan']:

return segment[api.PHYSICAL_NETWORK] in mappings

else:

return False

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def try_to_bind_segment_for_agent(self, context, segment, agent):

if self.check_segment_for_agent(segment, agent):

vif_type = self._get_vif_type(

context.current[portbindings.VNIC_TYPE])

context.set_binding(segment[api.ID],

vif_type,

self.vif_details)

# REVISIT(irenab): Temporary solution till nova support

# will be merged for physical_network propagation

# via VIF object to VIFDriver (required by mlnx vif plugging).

if self.update_profile:

profile = {'physical_network':

segment['physical_network']}

context._binding.profile = jsonutils.dumps(profile)

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def _get_vif_type(self, requested_vnic_type):

if requested_vnic_type == portbindings.VNIC_MACVTAP:

return portbindings.VIF_TYPE_MLNX_DIRECT

elif requested_vnic_type == portbindings.VNIC_DIRECT:

return portbindings.VIF_TYPE_MLNX_HOSTDEV

return self.vif_type