Allow setting grh traffic class

[xmakro]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 6.1%. Comparing base (89ed22d) to head (369f0ef).

Files with missing lines	Patch %	Lines
ibverbs/src/lib.rs	0.0%	7 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
ibverbs/src/lib.rs	5.4% <0.0%> (-0.1%)	⬇️

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