[dpdk-users] 17.05 --> 17.11, minimum hash table key size

[Dumitrescu, Cristian]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Yeddula, Avinash
> Sent: Friday, June 29, 2018 1:11 AM
> To: dev at dpdk.org; dev <dev-bounces at dpdk.org>; users at dpdk.org
> Cc: Bly, Mike <mbly at ciena.com>
> Subject: [dpdk-dev] 17.05 --> 17.11, minimum hash table key size
> 
> Hello,
> 
> We are in process of migrating our design from DPDK 17.05 to 17.11 and we
> ran into a small problem. Within our design, we have some hash tables with
> 4-byte keys. While going through the changes done in 17.11, we have found
> there was an added key_size check, which now requires key_size >= 8 bytes
> (see check_params_create() in rte_table_hash_ext.c). Not seeing any other
> options, so I was hoping someone could advise on how to support a 4-byte
> hash key size in 17.11 and on a go forward basis.
> 
> Regards,
> Avinash

Hi Avinash,

Simply declare you key size to be 8 bytes for any key size less or equal to 8 bytes and set the key mask parameter appropriately so that the additional bytes are masked out.

Regards,
Cristian