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

[netdev@kapio-technology.com]

On 2022-08-25 13:58, Ido Schimmel wrote:
> On Thu, Aug 25, 2022 at 12:27:01PM +0200, netdev@kapio-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.