e1000e: add handshake with the Intel CSME to support S0ix

[You-Sheng Yang]

[SRU Justification]

[Impact]

These improves power consumption on some e1000e platforms.

[Fix]

3 fixes in thread https://www.spinics.net/lists/netdev/msg755279.html
(now in netdev/net-next.git).

[Test Case]

These fixes solves two issues that the first one is the power
consumption would be lower to 1.651W from 2.032W when device enters
sleep state. The second is I219 may now enter ultra lower power mode
after resumed from s2idle.

[Where problems could occur]

While these fixes are still not in mainline but net-next, expecting some
more stability fix when necessary.

========== original bug description ==========

Intel is doing some improvement for the Corp ME + S0ix support.

Currently, this patch series have been landed in nextdev, net-next tree.

e1000e: Additional PHY power saving in S0ix
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=3ad3e28cb203309fb29022dea41cd65df0583632

e1000e: Add polling mechanism to indicate CSME DPG exit
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=ef407b86d3cc7ab7ad37658c1c7a094cb8f3b6b4

e1000e: Add handshake with the CSME to support S0ix
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=3e55d231716ea361b1520b801c6778c4c48de102

[You-Sheng Yang (vicamo)]

PPA: https://launchpad.net/~vicamo/+archive/ubuntu/linux-staging, version 5.13.0-9009.10+staging.3

[You-Sheng Yang (vicamo)]

For patch "e1000e: Add handshake with the CSME to support S0ix", it was meant to be a clean fix for bug 1919321. To test this correctly, starting from version 5.13.0-9010.11+staging.7 that fix for bug 1919321 will be reverted.

[You-Sheng Yang (vicamo)]

Correct: patch "e1000e: Add handshake with the CSME to support S0ix" is _not_ for bug 1919321. Previous revertion has been removed. So from staging.9 there will be both this csme handshake patch and ubuntu sauced work-around for bug 1919321.

[You-Sheng Yang (vicamo)]

SRU: https://lists.ubuntu.com/archives/kernel-team/2021-August/123304.html (oem-5.13, i, u)

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[You-Sheng Yang (vicamo)]

verified linux-oem-5.13 version 5.13.0-1011.14 from focal-proposed.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.13 - 5.13.0-1012.16

---------------
linux-oem-5.13 (5.13.0-1012.16) focal; urgency=medium

  * focal/linux-oem-5.13: 5.13.0-1012.16 -proposed tracker (LP: #1942861)

  * Fix sluggish r8169 by disaling ASPM L1.2 (LP: #1942830)
    - SAUCE: r8169: Disable ASPM L1.2

  * CVE-2021-3609
    - can: bcm: delay release of struct bcm_op after synchronize_rcu()
    - can: j1939: j1939_sk_init(): set SOCK_RCU_FREE to call sk_destruct() after
      RCU is done

 -- Timo Aaltonen <email address hidden> Tue, 07 Sep 2021 11:49:54 +0300

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.13.0-16.16

---------------
linux (5.13.0-16.16) impish; urgency=medium

  * impish/linux: 5.13.0-16.16 -proposed tracker (LP: #1942611)

  * Miscellaneous Ubuntu changes
    - [Config] update toolchain in configs

  * Miscellaneous upstream changes
    - Revert "UBUNTU: [Config] Enable CONFIG_UBSAN_BOUNDS"

 -- Andrea Righi <email address hidden> Fri, 03 Sep 2021 16:21:14 +0200