> And the best way for this to be handled is really to have the
> target driver query the host bus adapter (HBA) to determine if
> the target supports tagged commands. If the target does then the
> target driver should hand off as many commands as possible to the
> HBA. At this point the HBA deals with transfer and resolution of
> the commands.

Of course, doing this would cause serious performance, maybe software
problems in the case where there are multiple active controllers on
the SCSI bus.

Sure, it's reasonably likely that NetBSD would fall over in this case,
anyhow...  but there's a lot of software that won't, and there're
actually some reasons why you may want to do it.

There's also the question of whether or not you _can_ find out how
many the drive can deal with, in any way other than sending down
infinitely many, and seeing when it no longer accepts them.
I'm not _sure_ if you can...


cgd