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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi, I am looking to determine the target queue for a flow in advance I=92m using dpdk-rss-flows.py to calculate the Toeplitz hash with I40E key. However, If I use the script as is, I don=92t obtain the correct queue beca= use the hash calculation isn=92t 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= =92t get the correct queue. In case you use RTE_ETH_HASH_SYMMETRIC_TOEPLITZ , the I40E key doesn=92t ch= ange - Right ? How do I find that the NIC does for symmetric hash so I can simulate it ? (src=3D"1.0.0.1", dst=3D"2.0.0.2")/TCP(sport=3D8819, dport=3D80) 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: "Luk=E1=9A =8Ai=9Ami=9A" To: Balakrishnan K , Stephen Hemminger Cc: "users@dpdk.org" Subject: Re: Symmetric RSS Hashing support in DPDK Date: Fri, 8 Mar 2024 08:29:32 +0100 [thread overview] Message-ID: <90dc11cf-8c60-4b90-a3fc-43b2351b6c93@cesnet.cz> (raw) In-Reply-To: > 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 hel= p required. > > Regards, > Bala > > -----Original Message----- > From: Stephen Hemminger > Sent: Wednesday, March 6, 2024 8:34 PM > To: Balakrishnan K > Cc: users@dpdk.org > Subject: Re: Symmetric RSS Hashing support in DPDK > > CAUTION: This email originated from outside of the organization. Do not c= lick 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 wrote: > >> Hello, >> Our application needs symmetric hashing to handle the reverse >> traffic on the same core, also to Improve performance by distributing th= e traffic across core. >> Tried using rss config as below . >> action_rss_tcp.types =3D 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 cou= ld 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 th= at > 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 --_000_PH0PR11MB4997D29EFE25BE208B5668FED1382PH0PR11MB4997namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable 
Hi,


I am looking to determine t=
he target queue for a flow in advance 
I=92m using dpdk-rss-flows.py to =
calculate the Toeplitz hash with I40E key.
However, If I use the script as is, I don=
=92t obtain the correct queue because the hash calculation isn=92t symmetri=
c.
I have attempted to XOR the source and destination IP addresses  =
;and source and destination  port before performing the calculation &n=
bsp;but I still don=92t get the correct queue.


In case you use R=
TE_ETH_HASH_SYMMETRIC_TOEPLITZ , the I40E key doesn=92t change - Right ?How do I find that the NIC does for symmetric hash so I can simulate it ? =

(src=3D"1.0.0.1", dst=3D"2.=
0.0.2")/TCP(sport=3D8819, dport=3D80)
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    DS=
T_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     &nbs=
p; 20
 
 
Thanks in a=
dvance,
Shaul.
 
From: "Luk=E1=9A =8Ai=9Ami=
=9A" <sismis@cesnet.cz>
To: Balakrishnan K <Balakrishnan.K1@tat=
acommunications.com>,
       =
 Stephen Hemminger <stephen@networkplumber.org>

Cc: "users@dpdk.org" <users@d=
pdk.org>


Subject: Re: Symmetric RSS=
 Hashing support in DPDK


Date: Fri, 8 Mar 2024 08:29:32 +0100 =
 [thread overview]


Message-ID: <90dc11cf-8c60-4b90-a3fc-43=
b2351b6c93@cesnet.cz> (raw)


In-Reply-To: <PSAPR04MB551616841D8221851FF79214D6272@PSAPR04MB5516.a=
pcprd04.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 o=
ut here:


 


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


 


Lukas


 


On 08. 03. 24 6:53, Balakrishnan K wrote:<=
/span>


> Hi Stephen,<=
/span>


>    T=
hanks for the response . I will below option and come back if any help requ=
ired.


> =



> Regards,


> Bala<=
o:p>


> =



> -----Original Messa=
ge-----


> From: Stephen Hemmi=
nger <stephen@networkplumber.org>


> Sent: Wednesday, Ma=
rch 6, 2024 8:34 PM


> To: Balakrishnan K =
<Balakrishnan.K1@tatacommunications.com>

> Cc: users@dpdk.org<=
/span>


> Subject: Re: Symmet=
ric RSS Hashing support in DPDK


> =



> CAUTION: This email=
 originated from outside of the organization. Do not click links or open at=
tachments unless you recognize the sender and know the content is safe.


> =



> On Wed, 6 Mar 2024 =
07:28:40 +0000


> Balakrishnan K <=
Balakrishnan.K1@tatacommunications.com> wrote:<=
/pre>

> =



>> Hello,


>>  &nbs=
p;  Our application needs symmetric hashing to handle the reverse


>> traffic on the =
same core, also to Improve performance by distributing the traffic across c=
ore.


>> Tried using rss=
 config as below .


>> action_rss_tcp.=
types =3D 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 op=
tions or API available to enable symmetric RSS hashing .=



>> We are using dp=
dk 20.11 and intel NIC X710 10GbE .


>> 


>> Regards,=



>> Bala


> With XL710 there ar=
e two choices:


>   &n=
bsp;      1. Set RSS hash function to RTE_ETH_HASH=
_SYMMETRIC_TOEPLITZ in


>   &n=
bsp;         the rte_eth_rss_conf p=
assed in during configure


>   &n=
bsp;      2. Use default (non symmetric TOEPLITZ) =
but pass in a rss_key that


>   &n=
bsp;         has duplicated bits in=
 the right place. Like:


> =



> 0x6d5a 0x6d5a 0x6d5=
a 0x6d5a


> 0x6d5a 0x6d5a 0x6d5=
a 0x6d5a


> 0x6d5a 0x6d5a 0x6d5=
a 0x6d5a


> 0x6d5a 0x6d5a 0x6d5=
a 0x6d5a


> 0x6d5a 0x6d5a 0x6d5=
a 0x6d5a


> =



> https://www.ndsl.kaist.edu/~kyoungsoo/pap=
ers/TR-symRSS.pdf




 






 
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