<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=Windows-1252"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="en-IL" link="blue" vlink="purple" style="word-wrap:break-word;line-break:after-white-space"> <div class="WordSection1"> OK, I found my issue.<o:p></o:p> <o:p> </o:p> The input to the hash function should include all 4 parameters also in case of symmetic: <o:p></o:p> (SRC_IP^DST_IP , SRC_IP^DST_IP, SRC_PORT^DST_PORT, SRC_PORT^DST_PORT) <o:p></o:p> <o:p> </o:p> Shaul.<o:p></o:p> <o:p> </o:p> <div id="mail-editor-reference-message-container"> <div> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"> From: Shaul Hamoi (shamoi) <shamoi@cisco.com> Date: Sunday, 31 March 2024 at 14:48 To: sismis@cesnet.cz <sismis@cesnet.cz> Cc: Balakrishnan.K1@tatacommunications.com <Balakrishnan.K1@tatacommunications.com>, stephen@networkplumber.org <stephen@networkplumber.org>, users@dpdk.org <users@dpdk.org> Subject: Re: Symmetric RSS Hashing support in DPDK<o:p></o:p> </div> <div> <div id="mail-editor-reference-message-container"> <div> <div> <pre>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.<o:p></o:p></pre> <div> <pre>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 ? <o:p></o:p></pre> <pre>(src="1.0.0.1", dst="2.0.0.2")/TCP(sport=8819, dport=80)<o:p></o:p></pre> <pre>Actual queue - 7 (32 RX queues)<o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre>Result with XOR:<o:p></o:p></pre> <pre>dpdk-rss-flows.py -s 8819 -d 80 -k i40e 32 1.0.0.1 2.0.0.2 <o:p></o:p></pre> <pre>SRC_IP SPORT DST_IP DPORT QUEUE<o:p></o:p></pre> <pre>1.0.0.1 8819 2.0.0.2 80 19<o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre>Result without (original script):<o:p></o:p></pre> <pre>dpdk-rss-flows.py -s 8819 -d 80 -k i40e 32 1.0.0.1 2.0.0.2 <o:p></o:p></pre> <pre>SRC_IP SPORT DST_IP DPORT QUEUE<o:p></o:p></pre> <pre>1.0.0.1 8819 2.0.0.2 80 20<o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre style="margin-bottom:12.0pt">Thanks in advance, Shaul.<o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre id="b">From: "Lukáš Šišmiš" <sismis@cesnet.cz><o:p></o:p></pre> <pre>To: Balakrishnan K <Balakrishnan.K1@tatacommunications.com>,<o:p></o:p></pre> <pre> Stephen Hemminger <stephen@networkplumber.org><o:p></o:p></pre> <pre>Cc: "users@dpdk.org" <users@dpdk.org><o:p></o:p></pre> <pre>Subject: <a href="https://inbox.dpdk.org/users/90dc11cf-8c60-4b90-a3fc-43b2351b6c93@cesnet.cz/#r">Re: Symmetric RSS Hashing support in DPDK</a><o:p></o:p></pre> <pre>Date: Fri, 8 Mar 2024 08:29:32 +0100 <a href="https://inbox.dpdk.org/users/90dc11cf-8c60-4b90-a3fc-43b2351b6c93@cesnet.cz/#r">[thread overview]</a><o:p></o:p></pre> <pre>Message-ID: <90dc11cf-8c60-4b90-a3fc-43b2351b6c93@cesnet.cz> (<a href="https://inbox.dpdk.org/users/90dc11cf-8c60-4b90-a3fc-43b2351b6c93@cesnet.cz/raw">raw</a>)<o:p></o:p></pre> <pre>In-Reply-To: <<a href="https://inbox.dpdk.org/users/PSAPR04MB551616841D8221851FF79214D6272@PSAPR04MB5516.apcprd04.prod.outlook.com/">PSAPR04MB551616841D8221851FF79214D6272@PSAPR04MB5516.apcprd04.prod.outlook.com</a>><o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre>Hi all,<o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre>I've made minimalist example app on how to set symmetric RSS support for <o:p></o:p></pre> <pre>X710 that uses RTE_FLOW rules - check it out here:<o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre><a href="https://github.com/lukashino/i40e-symmetric-rss-rte-flow">https://github.com/lukashino/i40e-symmetric-rss-rte-flow</a><o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre>Lukas<o:p></o:p></pre> <pre> <o:p></o:p></pre> <pre>On 08. 03. 24 6:53, Balakrishnan K wrote:<o:p></o:p></pre> <pre>> Hi Stephen,<o:p></o:p></pre> <pre>> Thanks for the response . I will below option and come back if any help required.<o:p></o:p></pre> <pre>> <o:p></o:p></pre> <pre>> Regards,<o:p></o:p></pre> <pre>> Bala<o:p></o:p></pre> <pre>> <o:p></o:p></pre> <pre>> -----Original Message-----<o:p></o:p></pre> <pre>> From: Stephen Hemminger <stephen@networkplumber.org><o:p></o:p></pre> <pre>> Sent: Wednesday, March 6, 2024 8:34 PM<o:p></o:p></pre> <pre>> To: Balakrishnan K <Balakrishnan.K1@tatacommunications.com><o:p></o:p></pre> <pre>> Cc: users@dpdk.org<o:p></o:p></pre> <pre>> Subject: Re: Symmetric RSS Hashing support in DPDK<o:p></o:p></pre> <pre>> <o:p></o:p></pre> <pre>> 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.<o:p></o:p></pre> <pre>> <o:p></o:p></pre> <pre>> On Wed, 6 Mar 2024 07:28:40 +0000<o:p></o:p></pre> <pre>> Balakrishnan K <Balakrishnan.K1@tatacommunications.com> wrote:<o:p></o:p></pre> <pre>> <o:p></o:p></pre> <pre>>> Hello,<o:p></o:p></pre> <pre>>> Our application needs symmetric hashing to handle the reverse<o:p></o:p></pre> <pre>>> traffic on the same core, also to Improve performance by distributing the traffic across core.<o:p></o:p></pre> <pre>>> Tried using rss config as below .<o:p></o:p></pre> <pre>>> action_rss_tcp.types = ETH_RSS_NONFRAG_IPV4_TCP | ETH_RSS_L3_SRC_ONLY|<o:p></o:p></pre> <pre>>> ETH_RSS_L3_DST_ONLY | ETH_RSS_L4_SRC_ONLY | ETH_RSS_L4_DST_ONLY; but could not get desired result.<o:p></o:p></pre> <pre>>> Is there any options or API available to enable symmetric RSS hashing .<o:p></o:p></pre> <pre>>> We are using dpdk 20.11 and intel NIC X710 10GbE .<o:p></o:p></pre> <pre>>> <o:p></o:p></pre> <pre>>> Regards,<o:p></o:p></pre> <pre>>> Bala<o:p></o:p></pre> <pre>> With XL710 there are two choices:<o:p></o:p></pre> <pre>> 1. Set RSS hash function to RTE_ETH_HASH_SYMMETRIC_TOEPLITZ in<o:p></o:p></pre> <pre>> the rte_eth_rss_conf passed in during configure<o:p></o:p></pre> <pre>> 2. Use default (non symmetric TOEPLITZ) but pass in a rss_key that<o:p></o:p></pre> <pre>> has duplicated bits in the right place. Like:<o:p></o:p></pre> <pre>> <o:p></o:p></pre> <pre>> 0x6d5a 0x6d5a 0x6d5a 0x6d5a<o:p></o:p></pre> <pre>> 0x6d5a 0x6d5a 0x6d5a 0x6d5a<o:p></o:p></pre> <pre>> 0x6d5a 0x6d5a 0x6d5a 0x6d5a<o:p></o:p></pre> <pre>> 0x6d5a 0x6d5a 0x6d5a 0x6d5a<o:p></o:p></pre> <pre>> 0x6d5a 0x6d5a 0x6d5a 0x6d5a<o:p></o:p></pre> <pre>> <o:p></o:p></pre> > <a href="https://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf">https://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf</a><o:p></o:p> <div> <o:p></o:p> </div> <div> <o:p></o:p> </div> </div> </div> </div> </div> </div> </div> </div> </div> </body> </html>