84b3ae3ae9
This patch provides the Linux Bridge agent driver the ability to control Linux Traffic Control (TC) to set the minimum required transmission rate for an interface. The TC library is refactored to use HTB qdiscs. This allows TC to define, for several flows in the same interface, the maximum and the minimum network bandwidth and the burst size. To be able to do traffic shaping (instead of policing) for ingress traffic, a new element, the Intermediate Functional Block device (IFB) is introduced. DocImpact Partial-Bug: #1560963 Change-Id: I4d4db54519f1435068d1af38819404d1e5d9cd52
80 lines
2.6 KiB
Python
80 lines
2.6 KiB
Python
# Copyright (c) 2016 OVH SAS
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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.agent.linux import ip_lib
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from neutron.agent.linux import tc_lib
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from neutron.tests.functional import base as functional_base
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BW_LIMIT = 100
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BURST = 50
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BW_MIN = 25
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DIRECTION_EGRESS = 'egress'
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class TcLibTestCase(functional_base.BaseSudoTestCase):
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def create_device(self, name):
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"""Create a tuntap with the specified name.
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The device is cleaned up at the end of the test.
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"""
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ip = ip_lib.IPWrapper()
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tap_device = ip.add_tuntap(name)
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self.addCleanup(tap_device.link.delete)
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tap_device.link.set_up()
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def test_bandwidth_limit(self):
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device_name = "tap_testmax"
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self.create_device(device_name)
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tc = tc_lib.TcCommand(device_name)
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tc.set_bw(BW_LIMIT, BURST, None, DIRECTION_EGRESS)
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bw_limit, burst, _ = tc.get_limits(DIRECTION_EGRESS)
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self.assertEqual(BW_LIMIT, bw_limit)
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self.assertEqual(BURST, burst)
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new_bw_limit = BW_LIMIT + 100
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new_burst = BURST + 50
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tc.set_bw(new_bw_limit, new_burst, None, DIRECTION_EGRESS)
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bw_limit, burst, _ = tc.get_limits(DIRECTION_EGRESS)
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self.assertEqual(new_bw_limit, bw_limit)
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self.assertEqual(new_burst, burst)
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tc.delete_bw(DIRECTION_EGRESS)
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bw_limit, burst, _ = tc.get_limits(DIRECTION_EGRESS)
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self.assertIsNone(bw_limit)
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self.assertIsNone(burst)
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def test_minimum_bandwidth(self):
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device_name = "tap_testmin"
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self.create_device(device_name)
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tc = tc_lib.TcCommand(device_name)
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tc.set_bw(None, None, BW_MIN, DIRECTION_EGRESS)
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_, _, bw_min = tc.get_limits(DIRECTION_EGRESS)
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self.assertEqual(BW_MIN, bw_min)
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new_bw_min = BW_MIN + 50
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tc.set_bw(None, None, new_bw_min, DIRECTION_EGRESS)
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_, _, bw_min = tc.get_limits(DIRECTION_EGRESS)
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self.assertEqual(new_bw_min, bw_min)
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tc.delete_bw(DIRECTION_EGRESS)
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_, _, bw_min = tc.get_limits(DIRECTION_EGRESS)
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self.assertIsNone(bw_min)
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