From owner-freebsd-scsi@FreeBSD.ORG  Wed Aug  6 11:50:05 2003
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From: Don Bowman <don@sandvine.com>
To: 'Scott' <scottl@pooker.samsco.home>, Nate Lawson <nate@root.org>
Date: Wed, 6 Aug 2003 14:49:57 -0400 
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Subject: RE: Ongoing U320 AIC7902 Seagate ST318453LW issues, SCB timed out
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> From: Scott [mailto:scottl@pooker.samsco.home]
> On Wed, 6 Aug 2003, Nate Lawson wrote:
> 
> > On Wed, 6 Aug 2003, Justin T. Gibbs wrote:
> > > > I offer this patch to make a loader tunable out of the maximum
> > > > tags supported.
> > >
> > > It should be a cam tunable.
> >
> > Terse.  I think he means it should be "kern.cam.ahd%d.max_tags"
> >
> 
> I'll go out on a limb and suggest 'kern.cam.da%d.max_tags" or 
> something
> similar, as this will be useful for more than just the Adaptec chip.

OK, you guys are exceeding my knowledge :)

cam_sim_alloc() seems to be the fn that ahd_attach() calls
that sets this.

i can put the tunable in cam_sim_alloc. Now, what is da%d?
This can't be per device (e.g. da0) I don't think, it seems
to be global to the driver.
the name that i know @ this level is ahd0 etc, 
i could put this in cam so that its 

sprintf(name, "kern.cam.%s%d.max_tags", sim_name, unit)

and then it would work for any driver.

justin suggested e.g. scsi0 for the name there, where
would i get that info?

--don