netdev - Re: powering off phys on 'ip link set down'

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Date:   Thu, 27 Aug 2020 12:29:49 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Network Development <netdev@...r.kernel.org>
Cc:     Lasse Klok Mikkelsen <Lasse.Klok@...vas.se>
Subject: Re: powering off phys on 'ip link set down'

On 27.08.2020 12:08, Rasmus Villemoes wrote:
> Hi,
> 
> We have a requirement that when an interface is taken down
> administratively, the phy should be powered off. That also works when
> the interface has link when the 'ip link set down ...' is run. But if
> there's no cable plugged in, the phy stays powered on (as can be seen
> both using phytool, and from the fact that a peer gets carrier once a
> cable is later plugged in).
> 
> Is this expected behaviour? Driver/device dependent? Can we do anything
> to force the phy off?
> 
This may be MAC/PHY-driver dependent. Which driver(s) do we talk about?
Also it may depend on whether Runtime PM is active for a PCI network
device. In addition WoL should be disabled.

> Thanks,
> Rasmus
> 
Heiner