Subject: add qos_params for th5 asic

[ccroy-arista]

Summary:

ASIC-specific qos_params.py files are needed in order for the qos tests to run against the associated ASICs. This change adds a qos_params file for the Tomahawk5 (th5) ASIC. Additional speed/cable length params can be subsequently added to this file for the Tomahawk5 ASIC.

Fixes: https://github.com/aristanetworks/sonic-qual.msft/issues/159 Note: This PR works in conjunction with the community version of the qos_param_generator.py file to resolve the aforementioned issue. Note: The values contained in this PR are experimental and have not been fully verified beyond simply resolving the aforementioned issue.

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?

Eliminate instances of KeyError: 'th5' being thrown when running qos tests, such as was identified in: https://github.com/aristanetworks/sonic-qual.msft/issues/159

How did you do it?

Added a qos params file specific to TH5.

How did you verify/test it?

Manual tested against a run of qos/test_qos_sai.py::TestQosSai on the topologies listed below, to verify the fix.

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

This patch covers only the following topology names (additional topologies can be added as desired):

• t0
• t0-256-l2vlan

[ccroy-arista]

Closing as initial prototype work that won't be upstreamed.