Subject: Re: [RFC PATCH net-next 0/3] Make the PHY library stop being so greedy when binding the generic PHY driver

From: "Russell King (Oracle)" <[email-masked]>
Date: Fri, 3 Sep 2021 19:58:50 +0100

On Fri, Sep 03, 2021 at 07:21:19PM +0200, Andrew Lunn wrote:
> Hi Russell
> 
> Do you have
> 
> auto brdsl
> 
> in your /etc/network/interfaces?
> 
> Looking at /lib/udev/bridge-network-interface it seems it will only do
> hotplug of interfaces if auto is set on the bridge interface. Without
> auto, it only does coldplug. So late appearing switch ports won't get
> added.

I think you're looking at this:

[ "$BRIDGE_HOTPLUG" = "no" ] && exit 0

?

Just before that is:

[ -f /etc/default/bridge-utils ] && . /etc/default/bridge-utils

and /etc/default/bridge-utils sets BRIDGE_HOTPLUG, which is by
default:

# Shoud we add the ports of a bridge to the bridge when they are
# hotplugged?
BRIDGE_HOTPLUG=no

and... none of this seems documented. Not in
/usr/share/doc/bridge-utils/README.Debian and not in the
bridge-utils-interfaces(5) man page. This is all a bit rubbish,
really.

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