RSS Hash returned by the gvnic pmd dpdk driver not matching Toeplitz
https://bugs.dpdk.org/show_bug.cgi?id=1441
Bug ID: 1441
Summary: RSS Hash returned by the gvnic pmd dpdk driver not
matching Toeplitz
Product: DPDK
Version: 24.03
Hardware: Other
OS: Linux
Status: UNCONFIRMED
Severity: critical
Priority: Normal
Component: ethdev
Assignee: [email protected]
Reporter: [email protected]Target Milestone: ---
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
), 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)
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.
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https://bugs.dpdk.org/show_bug.cgi?id=1441
David Marchand ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|CONFIRMED |RESOLVED
Resolution|--- |FIXED
CC| |[email protected]--- Comment #1 from David Marchand ([email protected]) --- Fixed in b0ab5e931135 ("net/gve: fix RSS hash endianness in DQO format").
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