linux-kernel - Re: [PATCH net-next 1/2] net: dsa: mv88e6xxx: Require ops be implemented to claim STU support

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Message-ID: <20220319200013.7fcdf637@thinkpad>
Date:   Sat, 19 Mar 2022 20:00:13 +0100
From:   Marek Behún <kabel@...nel.org>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     davem@...emloft.net, kuba@...nel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net: dsa: mv88e6xxx: Require ops be
 implemented to claim STU support

On Fri, 18 Mar 2022 21:13:20 +0100
Tobias Waldekranz <tobias@...dekranz.com> wrote:

> Simply having a physical STU table in the device doesn't do us any
> good if there's no implementation of the relevant ops to access that
> table. So ensure that chips that claim STU support can also talk to
> the hardware.
> 
> This fixes an issue where chips that had a their ->info->max_sid
> set (due to their family membership), but no implementation (due to
> their chip-specific ops struct) would fail to probe.
> 
> Fixes: 49c98c1dc7d9 ("net: dsa: mv88e6xxx: Disentangle STU from VTU")
> Reported-by: Marek Behún <kabel@...nel.org>
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>

Tested-by: Marek Behún <kabel@...nel.org>