linux-kernel - Re: [PATCH net-next 3/4] net: dsa: mv88e6xxx: Add support for bridge port locked feature

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Message-ID: <YgEnIksFSHaRZtK7@lunn.ch>
Date:   Mon, 7 Feb 2022 15:05:22 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Hans Schultz <schultz.hans@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Hans Schultz <schultz.hans+netdev@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 3/4] net: dsa: mv88e6xxx: Add support for bridge
 port locked feature

On Mon, Feb 07, 2022 at 11:07:41AM +0100, Hans Schultz wrote:
> Supporting bridge port locked mode using the 802.1X mode in Marvell
> mv88e6xxx switchcores is described in the '88E6096/88E6097/88E6097F
> Datasheet', sections 4.4.6, 4.4.7 and 5.1.2.1 (Drop on Lock).

This implementation seems to be incorrect for 6390X, and maybe
others. I just picked a modern devices at random, and it is different,
so didn't check any other devices.  The 6390X uses bits 14 and 15, not
just bit 14.

So either you need to narrow down support to just those devices this
actually works for, or you need to add implementations for all
generations, via an op in mv88e6xxx_ops.

    Andrew