[RFC PATCH dpdk] fib6: implement RCU rule reclamation

[Medvedkin, Vladimir]

Hi Robin,

Apologies for late the delay, I'll reply to the original email

On 10/10/2025 9:55 AM, Robin Jarry wrote:
> Robin Jarry, Jun 10, 2025 at 16:53:
>> Currently, for the TRIE algorithm (actually, it should be called
>> DIR-24-8-8-8-8-8-8-8-8-8-8-8-8), the tbl8 group is freed even though the
>> readers might be using the tbl8 group entries. The freed tbl8 group can
>> be reallocated quickly. As a result, lookup may be performed
>> incorrectly.
>>
>> To address that, RCU QSBR is integrated for safe tbl8 group reclamation.
>>
>> Cc: Vladimir Medvedkin <vladimir.medvedkin at intel.com>
>> Signed-off-by: Robin Jarry <rjarry at redhat.com>
>> ---
>>
>> Notes:
>>      This is a semi-copy-paste of the FIB4 implementation.
>>      
>>      I couldn't understand the implementation of trie_modify with regard to
>>      depth_diff handling.
>>      
>>      The unit tests fail because depth_diff is always 0 when deleting a route
>>      which causes any subsequent add to fail with a -ENOSPC error.
>>      
>>      Vladimir, could you give some more insights on the matter?
> Gentle bump. Hi Vladimir, could you have a look? Thanks!
>
-- 
Regards,
Vladimir