Date: Thu, 11 Nov 2010 10:09:22 -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: <20101111180922.GA17566@michelle.cdnetworks.com> In-Reply-To: <alpine.BSF.2.00.1011110805280.2753@saya.home.yamagi.org> 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> <20101110234128.GC13340@michelle.cdnetworks.com> <alpine.BSF.2.00.1011110805280.2753@saya.home.yamagi.org>
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On Thu, Nov 11, 2010 at 08:08:25AM +0100, Yamagi Burmeister wrote: > On Wed, 10 Nov 2010, Pyun YongHyeon wrote: > > >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 > > Okay, that does the trick. At shutdown the link speed is changed to > 10/100Mbps, at boot - either via WOL magic packet or manuell startup - > it's changed back to 1000Mbps. > Thanks, patch committed(r215132), will MFC after a week. > Thanks again, > Yamagi > > -- > Homepage: www.yamagi.org > Jabber: yamagi@yamagi.org > GnuPG/GPG: 0xEFBCCBCB
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