netdev - RE: [patch 02/10] forcedeth: power down phy when interface is down

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Message-ID: <F72FA20C31DD4F4C997B91C5B3690A091A990F@hqemmail07.nvidia.com>
Date:	Fri, 14 Dec 2007 12:30:12 -0800
From:	"Ayaz Abdulla" <AAbdulla@...dia.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ed Swierk" <eswierk@...stra.com>
Cc:	<jeff@...zik.org>, <netdev@...r.kernel.org>
Subject: RE: [patch 02/10] forcedeth: power down phy when interface is down

Ed,

You mention that the phy will become 100Mbit half duplex, but during
nv_close, the phy setting is not modified. This might be a separate
issue.

Ayaz

-----Original Message-----
From: Andrew Morton [mailto:akpm@...ux-foundation.org] 
Sent: Thursday, December 13, 2007 5:07 PM
To: Ed Swierk
Cc: Ayaz Abdulla; jeff@...zik.org; netdev@...r.kernel.org
Subject: Re: [patch 02/10] forcedeth: power down phy when interface is
down


On Thu, 13 Dec 2007 16:53:58 -0800
"Ed Swierk" <eswierk@...stra.com> wrote:

> On 12/13/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > Does this patch actually fix any observeable problem?
> 
> Without the patch, ifconfig down leaves the physical link up, which
> confuses datacenter users who expect the link lights both on the NIC
> and the switch to go out when they bring an interface down.
> 
> Furthermore, even though the phy is powered on, autonegotiation stops
> working, so a normally gigabit link might suddenly become 100 Mbit
> half-duplex when the interface goes down, and become gigabit when it
> comes up again.
> 

OK, thanks, I added that text to the changelog along with Ayaz's
objection
and shall continue to bug people with it until we have a fix merged.  
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