linux-kernel - General network driver suspend/resume (was e1000 carrier related)

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Date:	Wed, 8 Nov 2006 11:54:14 -0800
From:	Stephen Hemminger <shemminger@...l.org>
To:	linux-kernel@...r.kernel.org
Subject: General network driver suspend/resume (was e1000 carrier related)

On Wed, 8 Nov 2006 13:04:07 +0100
Pavel Machek <pavel@....cz> wrote:

> Hi!
> 
> > >>This behavior differs from every other network card, and is also present 
> > >>in the
> > >>7.3* version of the driver from sourceforge.
> > >>
> > >>I think the e1000 should try to raise the link during the probe, so that 
> > >>it
> > >>works properly, without having to set ifconfig ethX up first.
> > >
> > >I think you should cc e1000 maintainers, and perhaps provide a patch....
> > 
> > I've read it and not come up with an answer due to some other issues at 
> > hand. E1000 hardware works differently and this has been asked before, but 
> > the cards itself are in low power state when down. Changing this to bring 
> > up the link would make the card start to consume lots more power, which 
> > would automatically suck enormously for anyone using a laptop.
> 
> Well, maybe E1000 should behave as the other cards behave, and
> different solution needs to be found for power saving? ifconfig eth0
> suspend?
> 
> 									Pavel
>  
> 

The standard which all network drivers should use is:

module insertion:
	start in initial powerdown state

open:
	power up, bring up link

stop:
	bring down link
	return to powerdown state unless WOL is set.
	if doing WOL go to lowest power sensing state

suspend:
	same as stop

resume:
	same as open

module removal:
	stop already called so device should be in power down state.


Since suspend is basically same as stop, and resume is open
I am going to investigate doing suspend/resume in the network device layer
(unless subclassed by driver), so we can rip out the suspend/resume hook
from many network drivers. There will still be boards like sky2
that need own suspend/resume to deal with dual port etc.

-- 
Stephen Hemminger <shemminger@...l.org>
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