Hi,
I am looking to determine the target queue for a flow in advance
I’m using dpdk-rss-flows.py to calculate the Toeplitz hash with I40E key.
However, If I use the script as is, I don’t obtain the correct queue because
the hash calculation isn’t symmetric.
I have attempted to XOR the source and destination IP addresses and source and
destination port before performing the calculation but I still don’t get the
correct queue.
In case you use RTE_ETH_HASH_SYMMETRIC_TOEPLITZ , the I40E key doesn’t change -
Right ?
How do I find that the NIC does for symmetric hash so I can simulate it ?
(src="1.0.0.1", dst="2.0.0.2")/TCP(sport=8819, dport=80)
Actual queue - 7 (32 RX queues)
Result with XOR:
dpdk-rss-flows.py -s 8819 -d 80 -k i40e 32 1.0.0.1 2.0.0.2
SRC_IP SPORT DST_IP DPORT QUEUE
1.0.0.1 8819 2.0.0.2 80 19
Result without (original script):
dpdk-rss-flows.py -s 8819 -d 80 -k i40e 32 1.0.0.1 2.0.0.2
SRC_IP SPORT DST_IP DPORT QUEUE
1.0.0.1 8819 2.0.0.2 80 20
Thanks in advance,
Shaul.
From: "Lukáš Šišmiš" <sis...@cesnet.cz>
To: Balakrishnan K <balakrishnan...@tatacommunications.com>,
Stephen Hemminger <step...@networkplumber.org>
Cc: "users@dpdk.org" <users@dpdk.org>
Subject: Re: Symmetric RSS Hashing support in
DPDK<https://inbox.dpdk.org/users/90dc11cf-8c60-4b90-a3fc-43b2351b6...@cesnet.cz/#r>
Date: Fri, 8 Mar 2024 08:29:32 +0100 [thread
overview]<https://inbox.dpdk.org/users/90dc11cf-8c60-4b90-a3fc-43b2351b6...@cesnet.cz/#r>
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In-Reply-To:
<psapr04mb551616841d8221851ff79214d6...@psapr04mb5516.apcprd04.prod.outlook.com<https://inbox.dpdk.org/users/psapr04mb551616841d8221851ff79214d6...@psapr04mb5516.apcprd04.prod.outlook.com/>>
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 <step...@networkplumber.org>
> Sent: Wednesday, March 6, 2024 8:34 PM
> To: Balakrishnan K <balakrishnan...@tatacommunications.com>
> Cc: users@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...@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
