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[Po-Hsu Lin <2014953@xxxxxxxxxxxxxxxxxx>]

This is in:

def get_max_lanes(port):
    """
    Get the $port's maximum number of lanes.
    Return: number of lanes, e.g. 1, 2, 4 and 8.
    """

    cmd = "devlink -j port show %s" % port
    stdout, stderr = run_command(cmd)
    assert stderr == ""
    values = list(json.loads(stdout)['port'].values())[0]

We're expecting stderr to be empty, but since this command triggers a
warning / error, the `assert stderr == ""` fails.

This issue does not exist with 6.5.0-4-generic (on node riccioli, it's
failing with L-ibm)

** Tags added: 6.2 lunar sru-20230807 ubuntu-kernel-selftests

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https://bugs.launchpad.net/bugs/2014953

Title:
  kernel_selftest: devlink_port_split.py mlx5_core warning triggers a
  failure

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Lunar:
  Incomplete

Bug description:
  The devlink command seems to print a warning that is considered as a
  failure during this test:

  4356	 	12:18:20 DEBUG| Running 'make run_tests -C net TEST_PROGS=devlink_port_split.py TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
      14357	 	12:18:20 DEBUG| [stdout] make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net'
      14358	 	12:18:20 DEBUG| [stdout] TAP version 13
      14359	 	12:18:20 DEBUG| [stdout] 1..1
      14360	 	12:18:20 DEBUG| [stdout] # selftests: net: devlink_port_split.py
      14361	 	12:18:20 DEBUG| [stdout] # Error sending command: devlink -j port show ens1
      14362	 	12:18:20 DEBUG| [stdout] # {"port":{"pci/0000:08:00.0/65535":{"type":"eth","netdev":"ens1","flavour":"physical","port":0,"splittable":false}}}
      14363	 	12:18:20 DEBUG| [stdout] #
      14364	 	12:18:20 DEBUG| [stdout] # Warning: mlx5_core: Invalid port.
      14365	 	12:18:20 DEBUG| [stdout] #
      14366	 	12:18:20 DEBUG| [stdout] # Traceback (most recent call last):
      14367	 	12:18:20 DEBUG| [stdout] #   File "/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/./devlink_port_split.py", line 309, in
      14368	 	12:18:20 DEBUG| [stdout] #     main()
      14369	 	12:18:20 DEBUG| [stdout] #   File "/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/./devlink_port_split.py", line 280, in main
      14370	 	12:18:20 DEBUG| [stdout] #     max_lanes = get_max_lanes(port.name)
      14371	 	12:18:20 DEBUG| [stdout] #                 ^^^^^^^^^^^^^^^^^^^^^^^^
      14372	 	12:18:20 DEBUG| [stdout] #   File "/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/./devlink_port_split.py", line 83, in get_max_lanes
      14373	 	12:18:20 DEBUG| [stdout] #     assert stderr == ""
      14374	 	12:18:20 DEBUG| [stdout] #            ^^^^^^^^^^^^
      14375	 	12:18:20 DEBUG| [stdout] # AssertionError
      14376	 	12:18:20 DEBUG| [stdout] not ok 1 selftests: net: devlink_port_split.py # exit=1

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