Add VgpuTypeIDToUint32 helper function

[PiotrProkop]

This PR adds new VgpuTypeIdToUint32 helper function that allows to retrieve underlying uint32 representation of nvmlVgpuTypeId:

type nvmlVgpuTypeId uint32

this makes it easier to programmatically create vgpus , for example:

echo $(uuidgen) > /sys/bus/pci/devices/0000\:06\:00.0/mdev_supported_types/nvidia-<typeID>/create

where <typeID> is this underlying uint32.

In previous versions of go-nvml I could just do type conversion to uint32 directly as device.GetSupportedVgpus() was returning:

type VgpuTypeId uint32

instead of Interface.

[elezar]

Thanks @PiotrProkop.

It would be good to get @klueska to also take a look at this.

[elezar]

I know that there are exceptions, but in general we try to expose NVML-functionality in these bindings and this goes against that a bit.

Does your example not indicate the need for a String() function off interface instead of an explicit *ToUint32 function?

[PiotrProkop]

I got impression that interface for VgpuTypeId is auto generated based on NVML lib funcs, so I wanted to propose less intrusive option. String or uint32 both works for me. I wanted to show that newer go-nvml version is missing some info that was present in older version.

[elezar]

I have looked at this a bit. What about doing something like we do for the Interface type where we have the function:

Extensions() ExtendedInterface

We could to the same for VgpuTypeId:

//go:generate moq -rm -out mock/extendedvgputypeid.go -pkg mock . ExtendedVgpuTypeId:ExtendedVgpuTypeId
type ExtendedVgpuTypeId interface {
       ID() uint32
}

I've pushed two commits with a proposal on top. Let me know what you think.

[PiotrProkop]

Looks good to me! Thanks for looking into this.

[PiotrProkop]

@klueska did you had a chance to take a look at it? nvidia-smi also provide vgpu type id as hex value, sample output from nvidia-smi vgpu -v -c

    vGPU Type ID                          : 0x402
        Name                              : NVIDIA GeForce GTX 1060
        Class                             : Geforce
        GPU Instance Profile ID           : N/A
        Max Instances                     : 2
        Max Instances Per VM              : 1
        Multi vGPU Exclusive              : False
        vGPU Exclusive Type               : False
        vGPU Exclusive Size               : False
        Device ID                         : 0x1e3710de
        Sub System ID                     : 0x1e37180d
        FB Memory                         : 8192 MiB
        BAR1 size                         : 256 MB
        Display Heads                     : 1
        Maximum X Resolution              : 7680
        Maximum Y Resolution              : 4320
        Frame Rate Limit                  : N/A
        Placement Size                    : N/A
        Creatable Placement IDs           : N/A
        GRID License                      : GRID-vGaming,8.0

where x402 is 1026 in decimal and you can use it to create vgpus on the host by running:

echo $(uuidgen) > /sys/bus/pci/devices/<gpu_pci>/mdev_supported_types/nvidia-1026/create

[klueska]

Why / how did this get generated at the bottom? The generation code sorts the functions alphabetically ...

[PiotrProkop]

I think vgpuTypeId doesn't have to be a pointer receiver.

[PiotrProkop]

I think vgpuTypeId doesn't have to be a pointer receiver.