From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Lunn <andrew@lunn.ch>
Subject: Re: How does vlan driver pass vlan info to the h/w ethernet driver
Date: Mon, 1 May 2017 16:37:03 +0200
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> > By what mechanism does the vlan driver (8021q.ko) tell the Ethernet
> > hardware about a vlan?

Why would the Ethernet hardware need to know?

An Ethernet Switch might need to know. If so, then switchdev would be
used, include/net/switchdev.h

    Andrew