netdev - stable backport: wifi: mac80211: track capability/opmode NSS separately

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Message-ID: <6d402141-a457-4096-a487-56b4140361be@hauke-m.de>
Date: Sat, 27 Jul 2024 00:54:21 +0200
From: Hauke Mehrtens <hauke@...ke-m.de>
To: stable@...r.kernel.org
Cc: miriam.rachel.korenblit@...el.com, johannes.berg@...el.com,
 quic_ramess@...cinc.com, linux-wireless@...r.kernel.org,
 netdev@...r.kernel.org
Subject: stable backport: wifi: mac80211: track capability/opmode NSS
 separately

Hi,

Please backport the following patch back to the stable series 6.6 and 6.1:
commit a8bca3e9371dc5e276af4168be099b2a05554c2a
Author: Johannes Berg <johannes.berg@...el.com>
Date:   Wed Feb 28 12:01:57 2024 +0100

     wifi: mac80211: track capability/opmode NSS separately

There is a small conflict in the copyright year update in 
net/mac80211/sta_info.h, just take the 2024 version.

On kernel 6.1 please backport this patch first to make the other one apply:
commit 57b341e9ab13e5688491bfd54f8b5502416c8905
Author: Rameshkumar Sundaram <quic_ramess@...cinc.com>
Date:   Tue Feb 7 17:11:46 2023 +0530

     wifi: mac80211: Allow NSS change only up to capability

This commit fixes a throughput regression introduced into Linux stable 
with the backport of following commit:

commit dd6c064cfc3fc18d871107c6f5db8837e88572e4
Author: Johannes Berg <johannes.berg@...el.com>
Date:   Mon Jan 29 15:53:55 2024 +0100

     wifi: mac80211: set station RX-NSS on reconfig

On older kernel versions it is harder to backport the fixes, maybe 
revert the offending commit in Linux stable 5.15 and older.

This regression was found by multiple users of OpenWrt in Wifi AP mode.
See the discussion in this forum thread: 
https://forum.openwrt.org/t/openwrt-23-05-4-service-release/204514/111

Thank you KONG from the OpenWrt forum for finding the commit which 
reduced the Wifi throughput.

Hauke