linux-kernel - Re: [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry flag to drivers

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Message-ID: <6fa538a1489a73fdf8b1fa92785185aa@kapio-technology.com>
Date:   Thu, 25 Aug 2022 15:41:49 +0200
From:   netdev@...io-technology.com
To:     Ido Schimmel <idosch@...dia.com>
Cc:     Vladimir Oltean <olteanv@...il.com>, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.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>,
        Daniel Borkmann <daniel@...earbox.net>,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry
 flag to drivers

On 2022-08-25 13:58, Ido Schimmel wrote:
> On Thu, Aug 25, 2022 at 12:27:01PM +0200, netdev@...io-technology.com 
> wrote:
> 
> Instead of skipping it you can check that roaming fails when "sticky" 
> is
> set.
> 

I think that the sticky flag topic generally is beyond the MAB feature, 
and it doesn't really fit into the bridge_locked_port.sh.
But anyhow I guess I can add it to the bridge_sticky_fdb.sh tests.

>> 
>> The bridge_locked_port.sh test is linked in
>> tools/testing/selftests/drivers/net/dsa/, but if I cannot check if the
>> mv88e6xxx driver or other switchcores are in use, I cannot do more.
> 
> Since the behavior of the HW data path is reflected to the software
> bridge and user space via "sticky" / "blackhole" / "extern_learn", you
> should be able to add test cases to the generic selftest. For example,
> if "blackhole" is set, then simple ping is expected to fail. Otherwise
> it is expected to pass.

The problem here is that the "blackhole" flag can only be set now from 
the mv88e6xxx driver under a locked port, and the locked port itself 
will not allow ping to work anyhow without a FDB entry free of the 
"locked" flag, as the MAB tests verify.
And disabling MAB on the locked port on the mv88e6xxx will clean the 
locked entries.

So I see it as a flag for future use, otherwise I will have to add a 
userspace command to enable the "blackhole" flag.


I have now made station move tests for both the locked port and MAB 
cases.