netdev - Re: [PATCH v5 net-next 6/6] selftests: forwarding: add test of MAC-Auth Bypass to locked port tests

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Date:   Mon, 29 Aug 2022 10:55:15 +0200
From:   netdev@...io-technology.com
To:     Ido Schimmel <idosch@...dia.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <shuah@...nel.org>,
        Christian Marangi <ansuelsmth@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yuwei Wang <wangyuweihx@...il.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 net-next 6/6] selftests: forwarding: add test of
 MAC-Auth Bypass to locked port tests

On 2022-08-29 09:40, Ido Schimmel wrote:
> On Sun, Aug 28, 2022 at 02:00:29PM +0200, netdev@...io-technology.com 
> wrote:
>> On 2022-08-27 20:21, Ido Schimmel wrote:
>> > "locked on learning on" is counter intuitive and IMO very much a
>> > misconfiguration that we should have disallowed when the "locked" option
>> > was introduced. It is my understanding that the only reason we are even
>> > talking about it is because mv88e6xxx needs it for MAB for some reason.
>> 
>> As the way mv88e6xxx implements "learning off" is to remove port 
>> association
>> for ingress packets on a port, but that breaks many other things such 
>> as
>> refreshing ATU entries and violation interrupts, so it is needed and 
>> the
>> question is then what is the worst to have 'learning on' on a locked 
>> port or
>> to have the locked port enabling learning in the driver silently?
>> 
>> Opinions seem to differ. Note that even on locked ports without MAB, 
>> port
>> association on ingress is still needed in future as I have a dynamic 
>> ATU
>> patch set coming, that uses age out violation and hardware refreshing 
>> to let
>> the hardware keep the dynamic entries as long as the authorized 
>> station is
>> sending, but will age the entry out if the station keeps silent for 
>> the
>> ageing time. But that patch set is dependent on this patch set, and I 
>> don't
>> think I can send it before this is accepted...
> 

> # bridge link set dev swp1 learning on locked on
> # bridge link set dev swp2 learning on locked on

As we must think in how most drivers work, which I am not knowledgeable 
of, I think that it is probably the best to think of the way mv88e6xxx 
works as an outlier.
If that is true, then I think the best option is to go with:
#bridge link set dev $swp1 learning off locked on
#bridge link set dev $swp2 learning off locked on

Then the cleanup side will just be:
#bridge link set dev $swp1 locked off
#bridge link set dev $swp2 locked off

The state 'learning off' is then consistent with the behavior of both 
the bridge and driver after the cleanup.