[action] [PR:13452] Enhanced Cisco specific ECN marking config verification test

[mssonicbld]

Description of PR

Summary:

Needed to uplift the case to Validate the ECN configuration

• To avoid assuming lossless PG as 3 and 4
• Check for and skip interfaces not having pfc_enable

Summary: Fixes # (issue)

1) read PORT_QOS_MAP and check for interfaces and pfc_enable configuration 2) Skip verification if pfc_enable is not set 3) Verify for each PG present in pfc_enable and remove assumption of 3 and 4 as lossless PG

Type of change

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

Back port request

• [ ] 202012
• [ ] 202205
• [ ] 202305
• [x] 202311
• [x] 202405

Approach

What is the motivation for this PR?

the existing script was verifying marking configuration for only lossless 3 and 4. Uplifted to make it generic by reading the configuration for lossless PGs.

How did you do it?

How did you verify/test it?

Verified it on Cisco box 1) By having interfaces with no PFC configuration 2) Having interfaces with selected PFC configuration

Any platform specific information?

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

Documentation

[mssonicbld]

Original PR: https://github.com/sonic-net/sonic-mgmt/pull/13452

[mssonicbld]

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