device_detach() on a device used by ixgbe driver (FreeBSD 7-STABLE through to 9-CURRENT)

[John Baldwin]

On Monday, May 23, 2011 3:08:05 pm Andrew Boyer wrote:
> 
> On May 23, 2011, at 10:32 AM, John Baldwin wrote:
> 
> > On Monday, May 23, 2011 10:13:41 am Philip Soeberg wrote:
> >> I would also expect the ixgbe.c driver to do a quick resource_disabled() 
> >> in it's attach() function, so that we can disable specific adapters 
> >> through kenv hint.ix.0.disabled=1..
> > 
> > That is not universally supported (i.e. it's not a part of new-bus 
> > specifically).  For buses that support hinted devices, they do all 
generally 
> > support being able to disable a hinted device, but disabling bus-
enumerated 
> > devices is not generally supported.
> > 
> 
> FYI, I submitted a patch to Jack to add this in all of the e1000/ixgbe 
drivers.  Setting a disabled="1" hint causes the attach to fail with ENXIO.  I 
don't know if it's 'correct' or not but it serves a purpose in our testing and 
I thought it would be useful for others.

One patch I have had for a while is a way to disable specific PCI devices, but 
that's not quite the same thing as it disables all drivers for a given device.

(It adds support for a 'hw.pci<domain>.<bus>.<slot>.<function>.disabled=1'
tunable).

-- 
John Baldwin