Adding background traffic to all-port-storm.

[rraghav-cisco]

Description of PR

Summary:

Recently cisco-8000 pfcwd was changed to not trigger watchdog when there is no traffic. So the pfcwd_timer_accuracy script fails, since there is no watchdog triggered during the test. So in this PR a new fixture is added for cisco-8000 only, that will run a background traffic on the selected port when the timer accuracy test is run.

Type of change

• [X] Bug fix
• [ ] Testbed and Framework(new/improvement)
• [ ] Test case(new/improvement)

Back port request

• [ ] 201911
• [ ] 202012
• [ ] 202205
• [X] 202305
• [X] 202311

Approach

What is the motivation for this PR?

The pfcwd feature was updated not to trigger watchdog when no traffic is present. So we need a background traffic to make the timer accuracy script to work.

How did you do it?

Added a background traffic fixture function, that uses supervisor in the PTF container.

How did you verify/test it?

Ran on T0 TB with sonic fanout: =============================================================================================== PASSES =============================================================================================== ____________________________________________________________________ TestPfcwdAllPortStorm.test_all_port_storm_restore[mth-t0-64] ____________________________________________________________________ --------------------------------------------- generated xml file: /run_logs/2024-03-25-20-11-56/pfcwd/test_pfcwd_all_port_storm_2024-03-25-20-11-56.xml ---------------------------------------------- INFO:root:Can not get Allure report URL. Please check logs --------------------------------------------------------------------------------------- live log sessionfinish --------------------------------------------------------------------------------------- 20:17:04 __init__.pytest_terminal_summary L0064 INFO | Can not get Allure report URL. Please check logs ====================================================================================== short test summary info ======================================================================================= PASSED pfcwd/test_pfcwd_all_port_storm.py::TestPfcwdAllPortStorm::test_all_port_storm_restore[mth-t0-64] ============================================================================== 1 passed, 1 warning in 306.27s (0:05:06) ============================================================================== sonic@3852cf4ada95:/data/tests$

Any platform specific information?

Specific to cisco-8000 only.

[rraghav-cisco]

The azure pipeline failure here is due to the dependency on the new function introduced in https://github.com/sonic-net/sonic-mgmt/pull/12143 After merging https://github.com/sonic-net/sonic-mgmt/pull/12143, this test should pass.

[rraghav-cisco]

@kevinskwang : Randall has approved the PR. Pls review.

[kevinskwang]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

Cherry-pick PR to 202311: https://github.com/sonic-net/sonic-mgmt/pull/12568

[mssonicbld]

Cherry-pick PR to 202305: https://github.com/sonic-net/sonic-mgmt/pull/12569