On Mon, 29 Jan 2024 19:18:38 +0300
Виктория Доможакова <[email protected]> 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.
