I am currently working with Ryu’s switch tester.py and I am getting results I
don’t quite understand, or I have uncovered a bug in tester.py. When running
the full of13 test suite many tests fail which I think should pass. Most of
the tests which feature a “goto_table:1” action fail.
For a baseline, I set up two OVS switches version 2.4.90 and connect them
through veth ports. I then start tester.py and I get a total test result of
OK(594) / ERROR(397).
One of the failures is appears as follows:
action: 23_SET_NW_TTL (IPv4)
ethernet/ipv4(ttl=64)/tcp-->'eth_type=0x0800,actions=set_nw_ttl:32,output:2'
OK
ethernet/vlan/ipv4(ttl=64)/tcp-->'eth_type=0x0800,actions=set_nw_ttl:32,output:2'
OK
ethernet/mpls/ipv4(ttl=64)/tcp-->'actions=pop_mpls:0x0800,goto_table:1','table_id:1,eth_type=0x0800,actions=set_nw_ttl:32,output:2'
ERROR
Receiving timeout: no change in tx_packets on target.
ethernet/itag/ethernet/ipv4(ttl=64)/tcp-->'actions=pop_pbb,goto_table:1','table_id:1,eth_type=0x0800,actions=set_nw_ttl:32,output:2'
ERROR
Failed to add flows: OFPErrorMsg[type=0x02, code=0x00]
The fourth test always fails but I don’t think OVS is supposed to support
MAC-in-MAC networks.
The third test shouldn’t fail but it does. If I remove all the tests and run
ONLY this one test file it passes:
action: 23_SET_NW_TTL (IPv4)
ethernet/ipv4(ttl=64)/tcp-->'eth_type=0x0800,actions=set_nw_ttl:32,output:2'
OK
ethernet/vlan/ipv4(ttl=64)/tcp-->'eth_type=0x0800,actions=set_nw_ttl:32,output:2'
OK
ethernet/mpls/ipv4(ttl=64)/tcp-->'actions=pop_mpls:0x0800,goto_table:1','table_id:1,eth_type=0x0800,actions=set_nw_ttl:32,output:2'
OK
ethernet/itag/ethernet/ipv4(ttl=64)/tcp-->'actions=pop_pbb,goto_table:1','table_id:1,eth_type=0x0800,actions=set_nw_ttl:32,output:2'
ERROR
Failed to add flows: OFPErrorMsg[type=0x02, code=0x00]
So it appears that tester.py does not clean up sufficiently after each test
file is run. Is it correct to interpret the data this way?
As an experiment, I added a timer.sleep(2) in the test loop as follows:
420 self.logger.info('--- Test start ---')
421 test_keys = tests.keys()
422 test_keys.sort()
423 for file_name in test_keys:
424 time.sleep(2)
425 report = self._test_file_execute(tests[file_name])
426 for result, descriptions in report.items():
427 test_report.setdefault(result, [])
428 test_report[result].extend(descriptions)
429 self._test_end(msg='--- Test end ---', report=test_report)
With the delay in place, the full test now yields OK(621) / ERROR(370). About
27 more tests pass than before. So some tests are affected by a race condition
with the setup.
Can someone familiar with tester.py advise me as to a next step to take?
----------------------------
Alan Deikman
ZNYX Networks, Inc.
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