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Message-ID: <c86fd8d5-b8c1-4b54-a689-9b6c8828b457@amd.com>
Date: Thu, 16 May 2024 09:56:22 +0100
User-Agent: Mozilla Thunderbird
Subject: Re: RSS Hash value returned by the gvnic pmd dpdk driver not matching
Toeplitz
To: Nagesh Mallappa <mallappanagesh@gmail.com>,
Jeroen de Borst <jeroendb@google.com>, Rushil Gupta <rushilg@google.com>,
Joshua Washington <joshwash@google.com>
References: <CABH5nGYTEJweZrockVxuU2YLgjjVi3QTL_0T__jyotxRt5mpSA@mail.gmail.com>
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From: Ferruh Yigit <ferruh.yigit@amd.com>
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On 5/15/2024 9:20 AM, Nagesh Mallappa wrote:
> Hi Team,
>
> We are using a C3 GCP instance having GVNIC with DPDK enabled.
> We are using latest version of DPDK ( dpdk-24.03 ) to configure RSS key,
> we understand C3 GCP instance with gvnic supports Toeplitz rss algorithm
> ( Reference
> - https://github.com/google/compute-virtual-ethernet-dpdk/blob/main/gve_ethdev.c <https://github.com/google/compute-virtual-ethernet-dpdk/blob/main/gve_ethdev.c> ), but we are hitting below issue.
>
> *Problem Statement - The RSS Hash value returned by the gvnic driver is
> different and is not matching the one computed by Toeplitz.*
>
> Using below script to compute rss hash value from Toeplitz.
> (https://gist.github.com/joongh/16867705b03b49e393cbf91da3cb42a7
> <https://gist.github.com/joongh/16867705b03b49e393cbf91da3cb42a7>)
>
> Consider below data to compute RSS Hash value -
>
> Source IP - 79.124.62.122
> Destination IP - 192.168.7.28
> Source Port - 49442
> Destination Port - 55327
> RSS Key - {0x94e3e97e, 0x4abac401, 0x1e0edbf, 0xe059e1f4, 0xb6e27dff,
> 0xdf55c916, 0xe9e6e4db, 0x1f9fb82c, 0x1e0edbf, 0xe059e1f4}
>
> *Hash Value returned by Toeplitz - 0x8bbafd0f*
>
> Gvnic dpdk pmd driver which uses Toeplitz RSS hash algorithm too is
> expected to compute above RSS Hash value but we see the Hash value
> stored in dpdk mbuf to be 0xc6a15941 which is not right.
> From the DPDK side we have ensured RSS offloading configuration is done
> appropriately, but still we are seeing above mismatch.
>
> We request you to please help us understand why this mismatch is
> happening and is this expected behavior of gvnic on C3 instance.
>
>
+ driver maintainers