Date: Wed, 10 Nov 2010 15:41:28 -0800 From: Pyun YongHyeon <pyunyh@gmail.com> To: Yamagi Burmeister <lists@yamagi.org> Cc: freebsd-net@freebsd.org Subject: Re: [patch] WOL support for nfe(4) Message-ID: <20101110234128.GC13340@michelle.cdnetworks.com> In-Reply-To: <20101109213421.GE7766@michelle.cdnetworks.com> References: <alpine.BSF.2.00.1011051057350.9984@saya.home.yamagi.org> <20101109011410.GB1275@michelle.cdnetworks.com> <alpine.BSF.2.00.1011090932550.2751@saya.home.yamagi.org> <20101109190713.GA7766@michelle.cdnetworks.com> <alpine.BSF.2.00.1011092141190.37352@maka.home.yamagi.org> <20101109213421.GE7766@michelle.cdnetworks.com>
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On Tue, Nov 09, 2010 at 01:34:21PM -0800, Pyun YongHyeon wrote: > 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. > Ok, I updated patch which will change link speed to 10/100Mps when shutdown/suspend is initiated. You can get the patch at the following URL. Please give it a try and let me know whether it really changes link speed to 10/100Mbps. If it does not work as expected, show me the dmesg output of your system. http://people.freebsd.org/~yongari/nfe/nfe.wol.patch2 > > 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 > > >>suspend: > > >> > > >> % 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 > > works. > > > > Thanks for testing. Probably you want to poke jkim@ to address > video resume issue.
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