netdev - b53 tags on bpi-r1 (bcm53125)

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Message-ID: <7c533a63-72e5-de68-99ff-8595492993a8@scram.de>
Date:   Tue, 21 Nov 2017 09:10:36 +0100
From:   Jochen Friedrich <jochen@...am.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org
Subject: b53 tags on bpi-r1 (bcm53125)

Hi Florian,

i just tested the latest DSA patches for b53 on a bpi-r1 device (net: 
dsa: b53: Turn on Broadcom tags).

Unfortunately, the bcm53125 does not seem to handle the broadcom tags on 
CPU port although tuned on b53_brcm_hdr_setup(). The tag is still 
visible on a device connected to one of the switch ports.

I wonder if there is something else necessary to make the chip handle 
the tags or if the chip doesn't support broadcom tags after all. The 
documentation at 
https://sourceforge.net/p/ohvesw/svn/12/tree/document/bcm/53125U-DS02-R.pdf 
doesn't document register 3 in the management page, at all...

Thanks,

Jochen