* DDP and symmetric RSS hash
@ 2024-01-29 16:18 Виктория Доможакова
2024-02-14 3:33 ` Stephen Hemminger
0 siblings, 1 reply; 2+ messages in thread
From: Виктория Доможакова @ 2024-01-29 16:18 UTC (permalink / raw)
To: users
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* Re: DDP and symmetric RSS hash
2024-01-29 16:18 DDP and symmetric RSS hash Виктория Доможакова
@ 2024-02-14 3:33 ` Stephen Hemminger
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Hemminger @ 2024-02-14 3:33 UTC (permalink / raw)
To: Виктория
Доможакова
Cc: users
On Mon, 29 Jan 2024 19:18:38 +0300
Виктория Доможакова <v.domozhakova@yandex.ru> wrote:
> Hi,
> I'm trying to set toeplitz symmetric hash function for packets from DDP.
> I've created flows for pppoe/pppol2tpv2/l2tpv2 headers in patterns and PCtypes as RSS hash types. But it is not working.
> What should I do to configure toeplitz symmetric hash function for packets from ddp?
>
> Best regards,
> Viktoriya Domozhakova
>
With most hardware you have to use a Toeplitz key which results in the symmetric hash.
Some hardware does symmetric hash by setting
/**
* Symmetric Toeplitz: src, dst will be replaced by
* xor(src, dst). For the case with src/dst only,
* src or dst address will xor with zero pair.
*/
RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ,
/**
* Symmetric Toeplitz: L3 and L4 fields are sorted prior to
* the hash function.
* If src_ip > dst_ip, swap src_ip and dst_ip.
* If src_port > dst_port, swap src_port and dst_port.
*/
RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ_SORT,
But that is restricted to newer smart NICs.
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