On Dec 19, 2006, at 15:55:43, Arjan van de Ven wrote:
On Tue, 2006-12-19 at 20:32 +0000, Matthew Garrett wrote:
On Tue, Dec 19, 2006 at 09:23:05PM +0100, Arjan van de Ven wrote:
On Tue, 2006-12-19 at 20:08 +0000, Matthew Garrett wrote:
I'm not sure. Suspending the chip means you lose things like
link beat detection, so it's not something you necessarily want
to automatically tie to something like interface status.
right now the "spec" for Linux network drivers assumes that you
put the NIC into D3 on down, except for cases where Wake-on-Lan
is enabled etc.
Really? I can't find any drivers that seem to do this. The only
calls to pci_set_power_state seem to be in the suspend, resume,
init and exit routines.
your grep missed tg3.c for example, which has a wrapper around the
power state code and goes to D3hot on downing of the interface.
(just the first one I looked at as a "reference driver", others
probably do the same thing)
I actually kind of like this feature; it makes it possible for
"ifdown" to virtually "unplug" the cable, such that the remote end
doesn't have an activated link. Admittedly it would be slightly more
useful to have the ifdown and the virtual-unplug be separate events.
There have been at least a few times where my Linux box is connected
to a network port I don't control that maintains some independent
state, and it's handy to be able to reset that state remotely.
Cheers,
Kyle Moffett
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