linux-kernel - Re: [PATCH net-next] net: dsa: mv88e6xxx: Fill in STU support for all supported chips

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Message-ID: <20220319200041.12d6d1c8@thinkpad>
Date:   Sat, 19 Mar 2022 20:00:41 +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>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: dsa: mv88e6xxx: Fill in STU support for
 all supported chips

On Sat, 19 Mar 2022 12:03:45 +0100
Tobias Waldekranz <tobias@...dekranz.com> wrote:

> Some chips using the split VTU/STU design will not accept VTU entries
> who's SID points to an invalid STU entry. Therefore, mark all those
> chips with either the mv88e6352_g1_stu_* or mv88e6390_g1_stu_* ops as
> appropriate.
> 
> Notably, chips for the Opal Plus (6085/6097) era seem to use a
> different implementation than those from Agate (6352) and onwards,
> even though their external interface is the same. The former happily
> accepts VTU entries referencing invalid STU entries, while the latter
> does not.
> 
> This fixes an issue where the driver would fail to probe switch trees
> that contained chips of the Agate/Topaz generation which did not
> declare STU support, as loaded VTU entries would be read back as
> invalid.
> 
> 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>