Re: [PATCH net-next + leds v2 0/7] PLEASE REVIEW: Add support for LEDs on Marvell PHYs

From: Andrew Lunn
Date: Wed Sep 09 2020 - 18:39:47 EST

> They are in /sys/class/net/eth0/phydev/leds by default, because they
> are children of the PHY device and are of `leds` class, and the PHY
> subsystem creates a symlink `phydev` when PHY is attached to the
> interface.
> They are in /sys/class/leds/ as symlinks, because AFAIK everything in
> /sys/class/<CLASS>/ is a symlink...
> > Have you played with network namespaces? What happens with
> >
> > ip netns add ns1
> >
> > ip link set eth0 netns ns1
> >
> > Andrew
> If you move eth0 to other network namespace, naturally the
> /sys/class/net/eth0 symlink will disappear, as will the directory it
> pointed to.
> The symlink phydev does will disappear from /sys/class/net/eth0/
> directory after eth0 is moved to ns1, and is lost. It does not return
> even if eth0 is moved back to root namespace.

Yes, i just played with this. I would say that is an existing bug. The
link would still work in the namespace, since the mdio_bus is not net
namespace aware and remains accessible from all namespaces.