Re: [PATCH v6 1/3] ublk: add opcode offsets for DRV_IN/DRV_OUT

[Christoph Hellwig]

On Tue, Jul 11, 2023 at 12:15:18PM +0200, Andreas Hindborg (Samsung) wrote:
> 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?

Well, there is a relationship, but it's one way.

Vendor specific command are basically always going to be used through
a passthrough interface, because they aren't standardized.

But most commands used through a passthrough interface are normal
standardized commands, just either used in a way not supported by
the normal Linux interface or just in creative ways.