From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 657D844034; Wed, 15 May 2024 10:33:39 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E8201402E9; Wed, 15 May 2024 10:33:38 +0200 (CEST) Received: from inbox.dpdk.org (inbox.dpdk.org [95.142.172.178]) by mails.dpdk.org (Postfix) with ESMTP id BB7734021D for ; Wed, 15 May 2024 10:33:37 +0200 (CEST) Received: by inbox.dpdk.org (Postfix, from userid 33) id 9D2EA44035; Wed, 15 May 2024 10:33:37 +0200 (CEST) From: bugzilla@dpdk.org To: dev@dpdk.org Subject: [DPDK/ethdev Bug 1441] RSS Hash returned by the gvnic pmd dpdk driver not matching Toeplitz Date: Wed, 15 May 2024 08:33:36 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: DPDK X-Bugzilla-Component: ethdev X-Bugzilla-Version: 24.03 X-Bugzilla-Keywords: X-Bugzilla-Severity: critical X-Bugzilla-Who: mallappanagesh@gmail.com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: dev@dpdk.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: multipart/alternative; boundary=17157620170.3DEB949.834286 Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All MIME-Version: 1.0 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org --17157620170.3DEB949.834286 Date: Wed, 15 May 2024 10:33:37 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All https://bugs.dpdk.org/show_bug.cgi?id=3D1441 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: dev@dpdk.org Reporter: mallappanagesh@gmail.com 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_ethde= v.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 expecte= d 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. --=20 You are receiving this mail because: You are the assignee for the bug.= --17157620170.3DEB949.834286 Date: Wed, 15 May 2024 10:33:37 +0200 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All
Bug ID 1441
Summary RSS Hash returned by the gvnic pmd dpdk driver not matching T= oeplitz
Product DPDK
Version 24.03
Hardware Other
OS Linux
Status UNCONFIRMED
Severity critical
Priority Normal
Component ethdev
Assignee dev@dpdk.org
Reporter mallappanagesh@gmail.com
Target Milestone --- 

We are using a C3 GCP instance hav=
ing 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/blo=
b/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 expecte=
d 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.

You are receiving this mail because:
  • You are the assignee for the bug.
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