linux-kernel - Re: [PATCH v8 net-next 2/2] net: dsa: mv88e6xxx: mac-auth/MAB implementation

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Date:   Sun, 04 Dec 2022 16:08:27 +0100
From:   netdev@...io-technology.com
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 net-next 2/2] net: dsa: mv88e6xxx: mac-auth/MAB
 implementation

On 2022-11-20 16:00, Vladimir Oltean wrote:
> On Sun, Nov 20, 2022 at 11:21:08AM +0100, netdev@...io-technology.com 
> wrote:
>> I have something like this, using 'mvls vtu' from
>> https://github.com/wkz/mdio-tools:
>>  VID   FID  SID  P  Q  F  0  1  2  3  4  5  6  7  8  9  a
>>    0     0    0  y  -  -  =  =  =  =  =  =  =  =  =  =  =
>>    1     2    0  -  -  -  u  u  u  u  u  u  u  u  u  u  =
>> 4095     1    0  -  -  -  =  =  =  =  =  =  =  =  =  =  =
>> 
>> as a vtu table. I don't remember exactly the consequences, but I am 
>> quite
>> sure that fid=0 gave
>> incorrect handling, but there might be something that I have missed as 
>> to
>> other setups.
> 
> Can you please find out? There needs to be an answer as to why 
> something
> which shouldn't happen happens.

Just an update on this, as when running the selftests now, I have 
experienced
the case where fid=0 in the interrupt handler. The reported mac is the 
same
as the one where the handling was successful in the selftest.

So I don't know what causes this fid=0 event, maybe some timing with the 
chip
op when stressed resulting in erroneous reading of fid?