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OpenStack Study: vlanbm.py**** CubicPower OpenStack Study ****
# vim: tabstop=4 shiftwidth=4 softtabstop=4 # # Copyright 2013 Brocade Communications System, 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. # # Authors: # Shiv Haris (sharis@brocade.com) # Varma Bhupatiraju (vbhupati@#brocade.com) """A Vlan Bitmap class to handle allocation/de-allocation of vlan ids.""" from six.moves import xrange from neutron.common import constants from neutron.plugins.brocade.db import models as brocade_db MIN_VLAN = constants.MIN_VLAN_TAG + 1 MAX_VLAN = constants.MAX_VLAN_TAG
**** CubicPower OpenStack Study **** class VlanBitmap(object): """Setup a vlan bitmap for allocation/de-allocation.""" # Keep track of the vlans that have been allocated/de-allocated # uses a bitmap to do this
**** CubicPower OpenStack Study **** def __init__(self, ctxt): """Initialize the vlan as a set.""" self.vlans = set(int(net['vlan']) for net in brocade_db.get_networks(ctxt) if net['vlan'] )
**** CubicPower OpenStack Study **** def get_next_vlan(self, vlan_id=None): """Try to get a specific vlan if requested or get the next vlan.""" min_vlan_search = vlan_id or MIN_VLAN max_vlan_search = (vlan_id and vlan_id + 1) or MAX_VLAN for vlan in xrange(min_vlan_search, max_vlan_search): if vlan not in self.vlans: self.vlans.add(vlan) return vlan
**** CubicPower OpenStack Study **** def release_vlan(self, vlan_id): """Return the vlan to the pool.""" if vlan_id in self.vlans: self.vlans.remove(vlan_id)
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