On Tue, Jul 11, 2023 at 11:02:15AM +0200, Andreas Hindborg (Samsung) wrote:

Christoph Hellwig [off-list ref] writes:

quoted

On Tue, Jul 11, 2023 at 08:23:40AM +0200, Andreas Hindborg (Samsung) wrote:

quoted

Yet most on-the-wire protocols for actual hardware does support this
some way or another.

Supports what?  Passthrough?  No.

Both SCSI and NVMe has command identifier ranges reserved for vendor
specific commands. I would assume that one use of these is to implement
passthrough channels to a device for testing out new interfaces. Just
guessing though.

Vendor specific commands is an entirely different concept from Linux
passthrough requests.