[Bridge] [RFC PATCH bpf-next 0/3] Add a new bpf helper for FDB lookup

[David Ahern]

On 8/5/20 4:26 AM, Yoshiki Komachi wrote:
>>
>> Just to clarify for myself. I expect that with just the helpers here
>> we should only expect static configurations to work, e.g. any learning
>> and/or aging is not likely to work if we do redirects in the XDP path.
> 
> As you described above, learning and aging don’t work at this point. 
> 
> IMO, another helper for learning will be required to fill the requirements.
> I guess that the helper will enable us to use the aging feature as well
> because the aging is the functionality of bridge fdb.

One option is to have a flag that bumps the ageing on successful lookup
and do that in 1 call. You will already have access to the fdb entry.