Re: "do ata" scsi command?

[Luben Tuikov <tluben@rogers.com>]

Jeff Garzik wrote:
> In terms of a userspace interface for my ata-over-scsi gadget, I would
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The main point.

> prefer to use /dev/sg instead of inventing a totally new interface.
> That, in turn, implies a need for a "do ata taskfile" scsi command,
> which is sorta like ATAPI in reverse:  we are wrapping a raw ata
> taskfile inside a scsi cdb.
> 
> My question is, does an existing standard or spec exist for such an idea?
> 
> If not, I'll just roll my own.

I read the whole thread.

It seems like you want what the 3ware LLDD is doing.  The format
and specs are closed, but the implementation is open: ioctl
and a char device ioctl.

What you lose is the block/scsi synchronizaion, but if you want
to support _closed_ vendor extensions, that's what you get.

Unless what you want to support has a command mapping already
in SCSI?  Did you check SBC-2, SMC-2, SCC-2, SES-2?  Wouldn't
you find any CDB's there which would fit in?  My guess is not.

Did you also check the mode pages, etc?

-- 
Luben