From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Lunn <andrew@lunn.ch>
Subject: Re: [PATCH] gianfar: Add gfar_change_carrier()
Date: Thu, 6 Dec 2018 20:43:17 +0100
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> I can have a look at using dormant, but what is change_carrier
> supposed to do if not this?

It is intended for interfaces which are stacked, like the team driver,
and for devices which don't have a phy, e.g. tun, and dummy.

> I didn't find a tool for DORMANT, I guess i will have to write one
> myself(using SIOCGIFFLAGS, SIOCSIFFLAGS)?

ip link should be able to set it.

Try ip link set mode dormant dev eth0

    Andrew