[action] [PR:13483] [Snappi] - fixing swss service restart logic for basic PFCWD testcases in multi-asic environment

[mssonicbld]

Description of PR

The existing PFCWD basic testcases have restart SWSS service testcases.

However, these testcases do not address the multi-asic environment. The pull-request addresses this.

Summary:
Fixes # (issue)
The fix finds out the DUT and interfaces used in the test and based on that selects swss@0 or swss@1 to restart. The fix first verifies if the platform field exists and if yes, is set to 'broadcom-dnx' field. If this is not true, then code executes the default testcase.

Type of change

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

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405

Approach

What is the motivation for this PR?

To address the multi-asic environment scenario and select appropriate SWSS depending upon the DUT-interface selected for the test.

How did you do it?

• Finding the DUT-interface used in the test.
• For Single line card - Single ASIC, the DUT will be same and interfaces will be from same ASIC. So only single swss is selected.
• For Single line card - Multi ASIC, DUT is same but interfaces will be from different ASIC and hence two SWSS instances are selected. Same logic for multiple line card scenario.

How did you verify/test it?

• Ran the test on local setup.

Logs for single line card single ASIC:

15:33:49 test_multidut_pfcwd_basic_with_snappi.te L0574 INFO | Issuing a restart of service swss@0 on the dut ixre-egl-board72
15:35:15 test_multidut_pfcwd_basic_with_snappi.te L0577 INFO | Wait until the system is stable

Logs for single line card multiple ASIC:

15:47:39 test_multidut_pfcwd_basic_with_snappi.te L0574 INFO | Issuing a restart of service swss@1 on the dut ixre-egl-board71
15:48:59 test_multidut_pfcwd_basic_with_snappi.te L0577 INFO | Wait until the system is stable
15:49:20 test_multidut_pfcwd_basic_with_snappi.te L0574 INFO | Issuing a restart of service swss@0 on the dut ixre-egl-board71
15:50:39 test_multidut_pfcwd_basic_with_snappi.te L0577 INFO | Wait until the system is stable

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[mssonicbld]

Original PR: #13483