54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
# Copyright 2013 Brocade Communications System, Inc.
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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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"""A Vlan Bitmap class to handle allocation/de-allocation of vlan ids."""
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from six import moves
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from neutron.plugins.brocade.db import models as brocade_db
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from neutron.plugins.common import constants as p_const
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MIN_VLAN = p_const.MIN_VLAN_TAG + 1
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MAX_VLAN = p_const.MAX_VLAN_TAG
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class VlanBitmap(object):
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"""Setup a vlan bitmap for allocation/de-allocation."""
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# Keep track of the vlans that have been allocated/de-allocated
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# uses a bitmap to do this
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def __init__(self, ctxt):
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"""Initialize the vlan as a set."""
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self.vlans = set(int(net['vlan'])
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for net in brocade_db.get_networks(ctxt)
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if net['vlan']
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)
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def get_next_vlan(self, vlan_id=None):
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"""Try to get a specific vlan if requested or get the next vlan."""
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min_vlan_search = vlan_id or MIN_VLAN
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max_vlan_search = (vlan_id + 1) if vlan_id else MAX_VLAN
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for vlan in moves.range(min_vlan_search, max_vlan_search):
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if vlan not in self.vlans:
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self.vlans.add(vlan)
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return vlan
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def release_vlan(self, vlan_id):
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"""Return the vlan to the pool."""
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if vlan_id in self.vlans:
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self.vlans.remove(vlan_id)
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