netdev - Re: [EXT] Re: [Intel-wired-lan] Intel I350 regression 5.10 -> 5.14 ("The NVM Checksum Is Not Valid") [8086:1521]

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Date:   Tue, 12 Oct 2021 18:34:35 +0200
From:   "Andreas K. Huettel" <andreas.huettel@...de>
To:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc:     netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        Jakub Kicinski <kubakici@...pl>
Subject: Re: [EXT] Re: [Intel-wired-lan] Intel I350 regression 5.10 -> 5.14 ("The NVM Checksum Is Not Valid") [8086:1521]

> > The messages easily identifiable are:
> > 
> > huettel@...acolada ~/tmp $ cat kernel-messages-5.10.59.txt |grep igb
> > Oct  5 15:11:18 dilfridge kernel: [    2.090675] igb: Intel(R) Gigabit Ethernet Network Driver
> > Oct  5 15:11:18 dilfridge kernel: [    2.090676] igb: Copyright (c) 2007-2014 Intel Corporation.
> > Oct  5 15:11:18 dilfridge kernel: [    2.090728] igb 0000:01:00.0: enabling device (0000 -> 0002)
> 
> This line is missing below, it indicates that the kernel couldn't or
> didn't power up the PCIe for some reason. We're looking for something
> like ACPI or PCI patches (possibly PCI-Power management) to be the
> culprit here.
> 

So I did a git bisect from linux-v5.10 (good) to linux-v5.14.11 (bad).

The result was:

dilfridge /usr/src/linux-git # git bisect bad
6381195ad7d06ef979528c7452f3ff93659f86b1 is the first bad commit
commit 6381195ad7d06ef979528c7452f3ff93659f86b1
Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Date:   Mon May 24 17:26:16 2021 +0200

    ACPI: power: Rework turning off unused power resources
[...]

I tried naive reverting of this commit on top of 5.14.11. That applies nearly cleanly, 
and after a reboot the additional ethernet interfaces show up with their MAC in the
boot messages.

(Not knowing how safe that experiment was, I did not go further than single mode and
immediately rebooted into 5.10 afterwards.)

-- 
PD Dr. Andreas K. Huettel
Institute for Experimental and Applied Physics
University of Regensburg
93040 Regensburg
Germany

e-mail andreas.huettel@...de
http://www.akhuettel.de/
http://www.physik.uni-r.de/forschung/huettel/