nvswitch: Add NVSWITCH_ALIAS

[zvonkok]

Similar to P_GPU_ALIAS add NVSWTICH_ALIAS to override he name that is originally given by the DP

> k describe node 
        ...
  nvidia.com/nvswitch:                        4
  nvidia.com/pgpu:                            8
       ...

Depends On: #26

[Copilot]

Pull request overview

This PR adds support for NVSwitch devices and introduces an NVSWITCH_ALIAS environment variable to override device naming, similar to the existing P_GPU_ALIAS for GPUs. The implementation refactors device discovery to use the go-nvlib library and adds CDI (Container Device Interface) spec generation for both GPUs and NVSwitches.

Changes:

• Added NVSWITCH_ALIAS environment variable support for customizing NVSwitch device naming
• Refactored device discovery to use go-nvlib instead of manual PCI filesystem operations
• Implemented CDI spec generation for discovered VFIO devices
• Enhanced test coverage with mock-based testing approach

Reviewed changes

Copilot reviewed 8 out of 3090 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
cmd/main.go	Added environment variable reading for NVSWITCH_ALIAS
pkg/device_plugin/device_plugin.go	Refactored to use go-nvlib for device discovery and added NVSwitch support
pkg/device_plugin/device_plugin_test.go	Updated tests to use mocks instead of filesystem fixtures
pkg/device_plugin/generic_device_plugin.go	Simplified allocation logic and removed deprecated helper functions
pkg/device_plugin/generic_device_plugin_test.go	Updated test fixtures to use new data structures
pkg/device_plugin/constants.go	Added CDI-related constants and removed deprecated basePath
pkg/device_plugin/cdi.go	New file implementing CDI spec generation
go.mod	Updated Go version and added new dependencies

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[rajatchopra]

LGTM

[coveralls]

Pull Request Test Coverage Report for Build 21154246385

Details

• 0 of 11 (0.0%) changed or added relevant lines in 3 files are covered.
• 52 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-13.3%) to 41.777%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/main.go	0	1	0.0%
pkg/device_plugin/cdi.go	0	5	0.0%
pkg/device_plugin/device_plugin.go	0	5	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/device_plugin/device_plugin.go	26	75.66%
pkg/device_plugin/generic_device_plugin.go	26	39.11%

Totals
Change from base Build 21079233964:	-13.3%
Covered Lines:	221
Relevant Lines:	529

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💛 - Coveralls