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

[netdev]

On 2022-12-08 14:35, Vladimir Oltean wrote:
> On Thu, Dec 08, 2022 at 01:28:27PM +0100, netdev@xxxxxxxxxxxxxxxxxxxx 
> wrote:
> > On 2022-12-07 21:29, Vladimir Oltean wrote:
> > > On Tue, Dec 06, 2022 at 05:36:42PM +0100, netdev@xxxxxxxxxxxxxxxxxxxx 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?