91 lines
3.0 KiB
Python
91 lines
3.0 KiB
Python
# Copyright (C) 2014 VA Linux Systems Japan K.K.
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# Copyright (C) 2014 YAMAMOTO Takashi <yamamoto at valinux co jp>
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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.common import constants as n_const
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class OFPort(object):
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def __init__(self, port_name, ofport):
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self.port_name = port_name
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self.ofport = ofport
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@classmethod
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def from_ofp_port(cls, ofp_port):
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"""Convert from ryu OFPPort."""
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return cls(port_name=ofp_port.name, ofport=ofp_port.port_no)
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PORT_NAME_LEN = 14
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PORT_NAME_PREFIXES = [
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n_const.TAP_DEVICE_PREFIX, # common cases, including ovs_use_veth=True
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"qvo", # nova hybrid interface driver
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"qr-", # l3-agent INTERNAL_DEV_PREFIX (ovs_use_veth=False)
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"qg-", # l3-agent EXTERNAL_DEV_PREFIX (ovs_use_veth=False)
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]
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def _is_neutron_port(name):
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"""Return True if the port name looks like a neutron port."""
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if len(name) != PORT_NAME_LEN:
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return False
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for pref in PORT_NAME_PREFIXES:
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if name.startswith(pref):
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return True
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return False
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def get_normalized_port_name(interface_id):
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"""Convert from neutron device id (uuid) to "normalized" port name.
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This needs to be synced with ML2 plugin's _device_to_port_id().
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An assumption: The switch uses an OS's interface name as the
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corresponding OpenFlow port name.
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NOTE(yamamoto): While it's true for Open vSwitch, it isn't
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necessarily true everywhere. For example, LINC uses something
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like "LogicalSwitch0-Port2".
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NOTE(yamamoto): The actual prefix might be different. For example,
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with the hybrid interface driver, it's "qvo". However, we always
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use "tap" prefix throughout the agent and plugin for simplicity.
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Some care should be taken when talking to the switch.
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"""
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return (n_const.TAP_DEVICE_PREFIX + interface_id)[0:PORT_NAME_LEN]
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def _normalize_port_name(name):
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"""Normalize port name.
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See comments in _get_ofport_name.
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"""
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for pref in PORT_NAME_PREFIXES:
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if name.startswith(pref):
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return n_const.TAP_DEVICE_PREFIX + name[len(pref):]
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return name
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class Port(OFPort):
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def __init__(self, *args, **kwargs):
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super(Port, self).__init__(*args, **kwargs)
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self.vif_mac = None
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def is_neutron_port(self):
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"""Return True if the port looks like a neutron port."""
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return _is_neutron_port(self.port_name)
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def normalized_port_name(self):
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return _normalize_port_name(self.port_name)
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