From owner-freebsd-hackers@FreeBSD.ORG  Thu Aug 16 09:47:01 2012
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From: Bob Bishop <rb@gid.co.uk>
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Date: Thu, 16 Aug 2012 10:46:42 +0100
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To: Marius Strobl <marius@alchemy.franken.de>
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Cc: David Duchscher <daved@tamu.edu>, Adrian Chadd <adrian@freebsd.org>,
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Subject: Re: Disabling ethernet link on an Intel nic?
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Hi,

On 16 Aug 2012, at 10:13, Marius Strobl wrote:

> I'm working on adding support to mii(4) for powering down PHYs when
> the network interface is down, but as you have noticed this non-
> trivial to get right, i.e. so they actually come out of power down
> mode again when bringing up the interface regardless of the media
> options used. We also clearly need a way to disable this behavior
> for the known-broken PHYs.

Please be very careful in case the PHY is carrying a piggy-backed IPMI =
NIC too.

> This is orthogonal to the 1 and 10 Gigabit Intel Ethernet drivers
> so as these don't take advantage of mii(4). Some time ago someone
> posted patches to net@ implementing/activating powering down the
> PHYs when these interfaces are down though.
>=20
> Marius

--
Bob Bishop
rb@gid.co.uk