netdev - Re: [PATCH v3 00/11] RTW88: Add support for USB variants

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Date:   Tue, 22 Nov 2022 15:55:27 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     Po-Hao Huang <phhuang@...ltek.com>
Cc:     linux-wireless@...r.kernel.org, Ping-Ke Shih <pkshih@...ltek.com>,
        Hans Ulli Kroll <linux@...i-kroll.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        netdev@...r.kernel.org, Kalle Valo <kvalo@...nel.org>,
        Yan-Hsuan Chuang <tony0620emma@...il.com>,
        linux-kernel@...r.kernel.org, Viktor Petrenko <g0000ga@...il.com>,
        Neo Jou <neojou@...il.com>, Po-Hao Huang <phhuang@...ltek.com>,
        kernel@...gutronix.de, Johannes Berg <johannes@...solutions.net>,
        Alexander Hochbaum <alex@...udo.com>,
        Da Xue <da@...re.computer>
Subject: Re: [PATCH v3 00/11] RTW88: Add support for USB variants

On Tue, Nov 22, 2022 at 03:52:15PM +0100, Sascha Hauer wrote:
> This is the third round of adding support for the USB variants to the
> RTW88 driver. There are a few changes to the last version which make it
> worth looking at this version.
> 
> First of all RTL8723du and RTL8821cu are tested working now. The issue
> here was that the txdesc checksum calculation was wrong. I found the
> correct calculation in various downstream drivers found on github.
> 
> The second big issue was that TX packet aggregation was wrong. When
> aggregating packets each packet start has to be aligned to eight bytes.
> The necessary alignment was added to the total URB length before
> checking if there is another packet to aggregate, so the URB length
> included that padding after the last packet, which is wrong.  Fixing
> this makes the driver work much more reliably.
> 
> I added all people to Cc: who showed interest in this driver and I want
> to welcome you for testing and reviewing.

There still is a problem with the RTL8822cu chipset I have here.  When
using NetworkManager I immediately lose the connection to the AP after
it has been connected:

[  376.213846] wlan0: authenticate with 76:83:c2:ce:81:b1
[  380.085463] wlan0: send auth to 76:83:c2:ce:81:b1 (try 1/3)
[  380.091446] wlan0: authenticated
[  380.108864] wlan0: associate with 76:83:c2:ce:81:b1 (try 1/3)
[  380.136448] wlan0: RX AssocResp from 76:83:c2:ce:81:b1 (capab=0x1411 status=0 aid=2)
[  380.202955] wlan0: associated
[  380.268140] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  380.275328] wlan0: Connection to AP 76:83:c2:ce:81:b1 lost

That doesn't happen when using plain wpa_supplicant. This seems to go
down to cd96e22bc1da ("rtw88: add beacon filter support"). After being
connected I get a BCN_FILTER_CONNECTION_LOSS beacon. Plain
wpa_supplicant seems to go another code patch and doesn't activate
connection quality monitoring.

The connection to the AP works fluently also with NetworkManager though
when I just ignore the BCN_FILTER_CONNECTION_LOSS beacon.

Any idea what may be wrong here?

Sascha

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