[patch] WOL support for nfe(4)
pyunyh at gmail.com
Tue Nov 9 21:35:18 UTC 2010
On Tue, Nov 09, 2010 at 10:01:36PM +0100, Yamagi Burmeister wrote:
> On Tue, 9 Nov 2010, Pyun YongHyeon wrote:
> >>No, the link stays at 1000Mbps so the driver must manually switch back
> >>to 10/100Mbps.
> >Hmm, this is real problem for WOL. Establishing 1000Mbps link to
> >accept WOL frames is really bad idea since it can draw more power
> >than 375mA. Consuming more power than 375mA is violation of
> >PCI specification and some system may completely shutdown the power
> >to protect hardware against over-current damage which in turn means
> >WOL wouldn't work anymore. Even if WOL work with 1000Mbps link for
> >all nfe(4) controllers, it would dissipate much more power.
> >Because nfe(4) controllers are notorious for using various PHYs,
> >it's hard to write a code to reliably establish 10/100Mbps link in
> >driver. In addition, nfe(4) is known to be buggy in link state
> >handling such that forced media selection didn't work well. I'll
> >see what could be done in this week if I find spare time.
> Hmm... Maybe just add a hint to the manpage that WOL is possible broken?
I think this may not be enough. Because it can damage your hardware
under certain conditions if protection circuit was not there.
> Nevertheless thanks for your work it's much appreciated :)
> >>>o When you put your box into suspend mode, can you wake up your box
> >>>with WOL magic packet?
> >>I'm sorry but I can't test that since none of those boxes supports
> >> % sysctl hw.acpi.suspend_state
> >> hw.acpi.suspend_state: NONE
> >You can switch to suspend mode with "acpiconf -s1". If all goes
> >well, driver would put the controller into suspend mode after
> >reprogramming controller to accept WOL frames. After that, you can
> >wakeup the box by sending a WOL magic packet.
> Okay, It thought that S3 is required. Put the box into S1, waited some
> minutes and send the magic packet. The video didn't resume but I was
> able to login via SSH. So waking up by sending the WOL magic packet
Thanks for testing. Probably you want to poke jkim@ to address
video resume issue.
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