linux-kernel - Re: [PATCH net-next 3/3] net: dsa: mv88e6xxx: mac-auth/MAB implementation

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Date:   Thu, 08 Dec 2022 15:41:24 +0100
From:   netdev@...io-technology.com
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Ido Schimmel <idosch@...sch.org>, 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 net-next 3/3] net: dsa: mv88e6xxx: mac-auth/MAB
 implementation

On 2022-12-08 14:35, Vladimir Oltean wrote:
> On Thu, Dec 08, 2022 at 01:28:27PM +0100, netdev@...io-technology.com 
> wrote:
>> On 2022-12-07 21:29, Vladimir Oltean wrote:
>> > On Tue, Dec 06, 2022 at 05:36:42PM +0100, netdev@...io-technology.com wrote:
>> > > > I was under the impression that we agreed that the locking change will
>> > > > be split to a separate patch.
>> > >
>> > > Sorry, I guess that because of the quite long time that has passed as I
>> > > needed to get this FID=0 issue sorted out, and had many other different
>> > > changes to attend, I forgot.
>> >
>> > Well, at least you got the FID=0 issue sorted out... right?
>> > What was the cause, what is the solution?
>> 
>> Well I got it sorted out in the way that I have identified that it is 
>> the
>> ATU op that fails some times. I don't think there is anything that can 
>> be
>> done about that, other than what I do and let the interrupt routing 
>> return
>> an error.
> 
> Yikes. But why would you call that "sorted out", though? Just to make 
> it
> appear as though you really spent some time on it, and use it as an
> excuse for something else?
> 
>> it is the ATU op that fails some times.
> 
> Let's start with the assumption that this is correct. A person with
> critical thinking will ask "can I prove that it is?".
> 
> If the ATU operation fails sometimes, I would expect that it always
> fails in the same way, by returning FID 0, where 0 is some kind of
> "invalid" value.
> 
> But if FID 0 is actually FID_STANDALONE, then you'd read FID_STANDALONE
> even if you change the value of FID_STANDALONE in the driver to
> something else, like 1.
> 
> Something ultra hackish like this will install VLAN 3050 as first VID 
> in
> the switch, and that will gain FID 0. Then, MV886XXX_VID_STANDALONE 
> will
> gain FID 1. So we need to adjust the definitions.
> 

Here is an example of the output I have when running the 
locked_port_mab() under the selftests...

mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6xxx_g1_atu_prob_irq_thread_fn: 13 callbacks suppressed
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2

the -22 errors are all when it returns FID=0, and it is the same mac all 
the way.


I have other logs, where the -22 occurs at random other times, f.ex. 
same test:

mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6xxx_g1_atu_prob_irq_thread_fn: 4 callbacks suppressed
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU miss violation for 
8e:a9:fc:14:58:06 portvec 0 spid 2
mv88e6085 1002b000.ethernet-1:04: ATU problem: error -22 while handling 
interrupt

What else conclusion than it is the ATU op that fails?