Symmetric RSS Hashing support in DPDK

[Lukáš Šišmiš]

Hi all,

I've made minimalist example app on how to set symmetric RSS support for 
X710 that uses RTE_FLOW rules - check it out here:

https://github.com/lukashino/i40e-symmetric-rss-rte-flow

Lukas

On 08. 03. 24 6:53, Balakrishnan K wrote:
> Hi Stephen,
>    Thanks for the response . I will below option and come back if any help required.
>
> Regards,
> Bala
>
> -----Original Message-----
> From: Stephen Hemminger <stephen at networkplumber.org>
> Sent: Wednesday, March 6, 2024 8:34 PM
> To: Balakrishnan K <Balakrishnan.K1 at tatacommunications.com>
> Cc: users at dpdk.org
> Subject: Re: Symmetric RSS Hashing support in DPDK
>
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
>
> On Wed, 6 Mar 2024 07:28:40 +0000
> Balakrishnan K <Balakrishnan.K1 at tatacommunications.com> wrote:
>
>> Hello,
>>     Our application needs symmetric hashing to handle the reverse
>> traffic on the same core, also to Improve performance by distributing the traffic across core.
>> Tried using rss config as below .
>> action_rss_tcp.types = ETH_RSS_NONFRAG_IPV4_TCP | ETH_RSS_L3_SRC_ONLY|
>> ETH_RSS_L3_DST_ONLY | ETH_RSS_L4_SRC_ONLY | ETH_RSS_L4_DST_ONLY; but could not get desired result.
>> Is there any options or API available to enable symmetric RSS hashing .
>> We are using dpdk 20.11 and intel NIC X710 10GbE .
>>
>> Regards,
>> Bala
> With XL710 there are two choices:
>          1. Set RSS hash function to RTE_ETH_HASH_SYMMETRIC_TOEPLITZ in
>             the rte_eth_rss_conf passed in during configure
>          2. Use default (non symmetric TOEPLITZ) but pass in a rss_key that
>             has duplicated bits in the right place. Like:
>
> 0x6d5a 0x6d5a 0x6d5a 0x6d5a
> 0x6d5a 0x6d5a 0x6d5a 0x6d5a
> 0x6d5a 0x6d5a 0x6d5a 0x6d5a
> 0x6d5a 0x6d5a 0x6d5a 0x6d5a
> 0x6d5a 0x6d5a 0x6d5a 0x6d5a
>
>          https://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf