netdev - Re: [PATCH] wifi: rtl8xxxu: fix authentication timeout due to incorrect RCR value

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Date:   Sun, 30 Apr 2023 13:36:50 +0300
From:   Bitterblue Smith <rtl8821cerfe2@...il.com>
To:     Yun Lu <luyun_611@....com>,
        Larry Finger <Larry.Finger@...inger.net>
Cc:     Jes.Sorensen@...il.com, kvalo@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] wifi: rtl8xxxu: fix authentication timeout due to
 incorrect RCR value

On 29/04/2023 06:35, Yun Lu wrote:
> At 2023-04-29 01:06:03, "Larry Finger" <Larry.Finger@...inger.net> wrote:
>> On 4/27/23 23:11, wo wrote:
>>> [  149.595642] [pid:7,cpu6,kworker/u16:0,0]BEFORE: REG_RCR differs from regrcr: 
>>> 0x1830613 insted of 0x7000604e
>>> [  160.676422] [pid:237,cpu6,kworker/u16:5,3]BEFORE: REG_RCR differs from 
>>> regrcr: 0x70006009 insted of 0x700060ce
>>> [  327.234588] [pid:7,cpu7,kworker/u16:0,5]BEFORE: REG_RCR differs from 
>> regrcr: 0x1830d33 insted of 0x7000604e
>>
>>
>> My patch was messed up, but it got the information that I wanted, which is shown 
>> in the quoted lines above. One of these differs only in the low-order byte, 
>> while the other 2 are completely different. Strange!
>>
>> It is possible that there is a firmware error. My system, which does not show 
>> the problem, reports the following:
>>
>> [54130.741148] usb 3-6: RTL8192CU rev A (TSMC) romver 0, 2T2R, TX queues 2, 
>> WiFi=1, BT=0, GPS=0, HI PA=0
>> [54130.741153] usb 3-6: RTL8192CU MAC: xx:xx:xx:xx:xx:xx
>> [54130.741155] usb 3-6: rtl8xxxu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin
>> [54130.742301] usb 3-6: Firmware revision 88.2 (signature 0x88c1)
>>
>> Which firmware does your unit use?
> 
> The firmware verion we used is 80.0 (signature 0x88c1)
>  [  903.873107] [pid:14,cpu0,kworker/0:1,2]usb 1-1.2: RTL8192CU rev A (TSMC) 2T2R, TX queues 2, WiFi=1, BT=0, GPS=0, HI PA=0
> [  903.873138] [pid:14,cpu0,kworker/0:1,3]usb 1-1.2: RTL8192CU MAC: 08:be:xx:xx:xx:xx
> [  903.873138] [pid:14,cpu0,kworker/0:1,4]usb 1-1.2: rtl8xxxu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin
> [  903.873474] [pid:14,cpu0,kworker/0:1,5]usb 1-1.2: Firmware revision 80.0 (signature 0x88c1)
> 
>>
>> Attached is a new test patch. When it logs a CORRUPTED value, I would like to 
>> know what task is attached to the pid listed in the message. Note that the two 
>> instances where the entire word was wrong came from pid:7.
>>
>> Could improper locking could produce these results?
>>
>> Larry
> 
> Apply your new patch, then turn on/off the wireless network switch on the network control panel serverl loops.
> The log shows:
> [   85.384429] [pid:221,cpu6,kworker/u16:6,5]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x70006009 insted of 0x700060ce
> [  121.681976] [pid:216,cpu6,kworker/u16:3,0]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x70006009 insted of 0x700060ce
> [  144.416992] [pid:217,cpu6,kworker/u16:4,1]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x70006009 insted of 0x700060ce
> 
> And if we up/down the interface serverl loops as follows:
> ifconfig wlx08bexxxxxx down
> sleep 1
> ifconfig wlx08bexxxxxx up
> sleep 10
> The log shows:
> [  282.112335] [2023:04:29 10:30:34][pid:95,cpu6,kworker/u16:1,3]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x1832e13 insted of 0x7000604e
> [  293.311462] [2023:04:29 10:30:45][pid:217,cpu7,kworker/u16:4,9]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x1830e72 insted of 0x7000604e
> [  304.435089] [2023:04:29 10:30:56][pid:217,cpu6,kworker/u16:4,9]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x1830ed3 insted of 0x7000604e
> [  315.532257] [2023:04:29 10:31:07][pid:95,cpu7,kworker/u16:1,8]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x7000604e insted of 0x7000604e
> [  324.114379] [2023:04:29 10:31:16][pid:221,cpu6,kworker/u16:6,7]REG_RCR corrupted in rtl8xxxu_configure_filter: 0x1832e14 insted of 0x7000604e
> 
> We also update the  firmware verion to 88.2, and the test results are the same as above.
> 
> Thank you for helping debug this issue, which seems to be related to specific devices.
> 
> Yun Lu
> 
> 
> 
> 
There was this bug report about phantom MAC addresses with
the RTL8188CUS:
https://lore.kernel.org/linux-wireless/a31d9500-73a3-f890-bebd-d0a4014f87da@reto-schneider.ch/

See the pcap file. I wonder if it's related?