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From:   Tao J <tao-j@outlook.com>
To:     mbizon@freebox.fr
Cc:     johannes@sipsolutions.net, linux-wireless@vger.kernel.org
Subject: Re: [RFC][PATCH] mac80211: fix VHT 160Mhz bandwidth when using extended NSS on PHY with NSS ratio
Date:   Tue, 16 Aug 2022 09:43:04 -0400
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Applied on 5.19 and worked.

AP: QCA9984
STA：AX201

Before patch:
iw dev wlan-ax201 link
rx bitrate: 866 MBit/s VHT-MCS 9 160MHz short GI VHT-NSS 1
tx bitrate: 866 MBit/s VHT-MCS 9 80MHz short GI VHT-NSS 2

After patch:
rx bitrate: 866 MBit/s VHT-MCS 9 160MHz short GI VHT-NSS 1
tx bitrate: 866 MBit/s VHT-MCS 9 160MHz short GI VHT-NSS 1

Notice that the tx rate did not change and the NSS reduced from 2 to 1.

But actually it should support VHT-NSS 2 and achieve 1733 MBit/s at least 
for rx bitrate (verified this with the same AP/STA using another OS,
 and iperf showed 1.2GBit/s).  Do you have any idea to fix that? 
Although it is beyond the scope of this patch.

with iw 5.19 ax201 showed
		VHT RX highest supported: 0 Mbps
		VHT TX highest supported: 0 Mbps
		VHT extended NSS: supported