Christoph Hellwig <hch@xxxxxxxxxxxxx> writes: > On Tue, Jul 11, 2023 at 11:02:15AM +0200, Andreas Hindborg (Samsung) wrote: >> >> Christoph Hellwig <hch@xxxxxxxxxxxxx> writes: >> >> > On Tue, Jul 11, 2023 at 08:23:40AM +0200, Andreas Hindborg (Samsung) wrote: >> >> 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. And yet they are somewhat similar, in the sense that they allow the user of a protocol to express semantics that is not captured in the established protocol. Uring command passthrough -> request passthrough -> vendor specific commands. They sort of map well in terms of what they allow the user to achieve. Or did I misunderstand something completely?
