217034 – rtw88: LM842 / rtw8822cu: nmcli device wifi rescan -> rtw_8822cu 1-1:1.2: timed out to flush queue 3

Bug 217034 - rtw88: LM842 / rtw8822cu: nmcli device wifi rescan -> rtw_8822cu 1-1:1.2: timed out to flush queue 3

Summary: rtw88: LM842 / rtw8822cu: nmcli device wifi rescan -> rtw_8822cu 1-1:1.2: tim...

Status:	NEW

Alias:	None

Product:	Networking
Classification:	Unclassified
Component:	Wireless (show other bugs)
Hardware:	All Linux

Importance:	P1 normal
Assignee:	networking_wireless@kernel-bugs.osdl.org

URL:
Keywords:

Depends on:
Blocks:

Reported:	2023-02-13 15:59 UTC by Andreas Henriksson
Modified:	2023-06-13 12:59 UTC (History)
CC List:	3 users (show)

See Also:
Kernel Version:	6.1.7
Subsystem:
Regression:	No
Bisected commit-id:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Description Andreas Henriksson 2023-02-13 15:59:31 UTC

```
$ nmcli c show --active
NAME    UUID                                  TYPE  DEVICE
ubnt5g  8b2fcc88-3c8d-4917-897b-5379edfa556f  wifi  wlx34c9f08deb6e

$ ping -c 3 -n 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=55 time=18.9 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=55 time=18.4 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=55 time=15.8 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2006ms
rtt min/avg/max/mdev = 15.751/17.687/18.871/1.380 ms

$ sudo nmcli device wifi rescan
^Ciotgw@iotgw:~$ [ 2063.798893] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2064.036068] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2064.546006] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2064.779659] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2065.419404] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2065.651876] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2066.297245] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2066.516015] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2067.285896] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2067.505863] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2068.125957] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2068.345881] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2068.965757] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2069.185909] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2069.816034] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2070.057802] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2070.738575] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2070.959705] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2071.609705] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2071.825714] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2072.536955] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2072.756305] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2073.418471] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2073.635616] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2074.295916] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2074.520051] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2075.248513] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2075.469085] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2076.106120] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2076.328201] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2077.028684] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2077.245581] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2077.905547] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2078.130617] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2078.815387] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2079.028660] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2079.675722] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2079.918714] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2080.610092] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2080.835288] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2081.518169] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2081.735397] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2082.385228] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2082.598238] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2083.285672] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2083.508074] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2084.206216] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2084.428000] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2085.085222] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2085.307920] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2085.985915] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2086.198063] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2086.856569] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2087.075015] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2087.735027] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2087.968145] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2088.637368] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2088.877854] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2089.558368] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2089.797758] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2090.477675] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2090.705176] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2091.377766] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2091.608341] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2092.316630] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2092.540072] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2093.217702] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2093.434937] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2094.097589] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[ 2094.315442] rtw_8822cu 1-1:1.2: timed out to flush queue 3

$ ping -c 3 -n 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=55 time=16.7 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=55 time=15.7 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=55 time=19.1 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2009ms
rtt min/avg/max/mdev = 15.655/17.160/19.141/1.462 ms
```



Note: this is on 6.1.7 with rtw88 driver changes from 6.2-rc1 backported + fixes from linux-wireless next + https://lore.kernel.org/linux-wireless/20230210111632.1985205-1-s.hauer@pengutronix.de/

Hardware: I'm using a LM842 usb dongle (which is apparently based on rtw8822cu) in a single-core 32bit arm board (NXP i.MX6 Solo X = imx6sx).

firmware version:
```
[   19.869415] rtw_8822cu 1-1:1.2: Firmware version 9.9.10, H2C version 15
[   19.987359] rtw_8822cu 1-1:1.2: WOW Firmware version 9.9.4, H2C version 15
[   23.294471] usbcore: registered new interface driver rtw_8822cu
```

Comment 1 Andreas Henriksson 2023-02-13 16:23:45 UTC

Upgraded to firmware 9.9.14 from https://github.com/pkshih/linux-firmware/raw/main/rtw88/rtw8822c_fw.bin (see https://lore.kernel.org/linux-wireless/95bf72c328de6450d8e0136317ea849830e4f67e.camel@realtek.com/ ) and now get this behaviour instead:

```

$ ping -n -c 3 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=55 time=25.2 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=55 time=15.6 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=55 time=16.4 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2006ms
rtt min/avg/max/mdev = 15.593/19.072/25.235/4.369 ms


$ nmcli c show --active
NAME    UUID                                  TYPE  DEVICE
ubnt5g  8b2fcc88-3c8d-4917-897b-5379edfa556f  wifi  wlx34c9f08deb6e


$ sudo nmcli dev wifi rescan
[  521.790095] rtw_8822cu 1-1:1.2: timed out to flush queue 3
[  527.756301] rtw_8822cu 1-1:1.2: failed to get tx report from firmware


$ ping -n -c 3 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
From 192.168.1.112 icmp_seq=1 Destination Host Unreachable
From 192.168.1.112 icmp_seq=2 Destination Host Unreachable
From 192.168.1.112 icmp_seq=3 Destination Host Unreachable

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2047ms
pipe 3


[  558.186433] rtw_8822cu 1-1:1.2: failed to get tx report from firmware

$ nmcli c show --active
NAME    UUID                                  TYPE  DEVICE
ubnt5g  8b2fcc88-3c8d-4917-897b-5379edfa556f  wifi  wlx34c9f08deb6e
```


Conclusion: updating from firmware 9.9.10 to 9.9.14 made the problem worse!

Comment 2 Ping-Ke Shih 2023-02-21 07:13:14 UTC

Since interference could affect TX, please try to disable EDCCA via debugfs: 

$ echo 0 > /sys/kernel/debug/ieee80211/phy0/rtw88/edcca_enable

Comment 3 Petter Mabäcker 2023-04-04 14:32:21 UTC

I can see same issue as Andreas. When using 9.9.15 it not only give me the error about tx report, the interfaces stops working apparently (see crash below after some time):

I have tried to disable EDCCA and it doesn't seem to matter. The "timed out to flush queue 3" is not present if I run with Sascha's WIP commit (https://lkml.kernel.org/linux-wireless/20230404072508.578056-2-s.hauer@pengutronix.de/T/#u) but the consequence is the same..

 # cat /sys/kernel/debug/ieee80211/phy0/rtw88/edcca_enable 
  EDCCA disabled: EDCCA mode 0
  
  # nmcli device wifi rescan
  # [  752.958662] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
  
  # ping 8.8.8.8
  PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
  ^C
  --- 8.8.8.8 ping statistics ---
  2 packets transmitted, 0 received, 100% packet loss, time 1081ms
  
  # [ 1012.899698] wlx34c9f08deb60: deauthenticated from d8:07:b6:83:ae:57 (Reason: 34=DISASSOC_LOW_ACK)
  [ 1013.295268] rtw_8822cu 1-1:1.2: timed out to flush queue 1
  [ 1013.515490] rtw_8822cu 1-1:1.2: timed out to flush queue 2
  [ 1013.846358] rtw_8822cu 1-1:1.2: timed out to flush queue 1
  [ 1014.075720] rtw_8822cu 1-1:1.2: timed out to flush queue 2
  [ 1015.012322] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
  [ 1017.526872] rtw_8822cu 1-1:1.2: error beacon valid
  [ 1017.534740] rtw_8822cu 1-1:1.2: Download probe request to firmware failed
  [ 1017.542307] rtw_8822cu 1-1:1.2: Update probe request failed
  [ 1017.609953] rtw_8822cu 1-1:1.2: HW scan failed with status: -16
  [ 1018.953131] rtw_8822cu 1-1:1.2: error beacon valid
  [ 1018.959368] rtw_8822cu 1-1:1.2: failed to download rsvd page
  [ 1018.973283] rtw_8822cu 1-1:1.2: failed to download firmware
  [ 1018.998986] rtw_8822cu 1-1:1.2: leave idle state failed
  [ 1019.054864] rtw_8822cu 1-1:1.2: failed to leave ips state
  [ 1019.060422] rtw_8822cu 1-1:1.2: failed to leave idle state
  [ 1033.143599] ------------[ cut here ]------------
  [ 1033.148854] WARNING: CPU: 0 PID: 288 at net/wireless/core.c:1463 cfg80211_netdev_notifier_call+0x3f0/0x754
  [ 1033.159033] Modules linked in: nf_tables libcrc32c nfnetlink rtw88_8822cu rtw88_8822c btusb btrtl rtw88_usb btbcm btintel btmtk rtw88_core imx_sdma ip_tables x_tables
  [ 1033.174622] CPU: 0 PID: 288 Comm: NetworkManager Not tainted 6.1.7-00082-ga92091912f99 #1
  [ 1033.182832] Hardware name: Freescale i.MX6 SoloX (Device Tree)
  [ 1033.188688]  unwind_backtrace from show_stack+0x10/0x14
  [ 1033.193964]  show_stack from dump_stack_lvl+0x58/0x70
  [ 1033.199052]  dump_stack_lvl from __warn+0xb4/0x24c
  [ 1033.203877]  __warn from warn_slowpath_fmt+0x74/0xbc
  [ 1033.208870]  warn_slowpath_fmt from cfg80211_netdev_notifier_call+0x3f0/0x754
  [ 1033.216045]  cfg80211_netdev_notifier_call from raw_notifier_call_chain+0x34/0x68
  [ 1033.223573]  raw_notifier_call_chain from __dev_notify_flags+0x64/0xe8
  [ 1033.230137]  __dev_notify_flags from dev_change_flags+0x3c/0x44
  [ 1033.236085]  dev_change_flags from do_setlink+0x28c/0xe90
  [ 1033.241515]  do_setlink from rtnl_newlink+0x53c/0x91c
  [ 1033.246594]  rtnl_newlink from rtnetlink_rcv_msg+0x170/0x540
  [ 1033.252279]  rtnetlink_rcv_msg from netlink_rcv_skb+0xbc/0x120
  [ 1033.258148]  netlink_rcv_skb from netlink_unicast+0x1ac/0x2e8
  [ 1033.263929]  netlink_unicast from netlink_sendmsg+0x1c4/0x43c
  [ 1033.269709]  netlink_sendmsg from ____sys_sendmsg+0x184/0x254
  [ 1033.275492]  ____sys_sendmsg from ___sys_sendmsg+0x6c/0xa4
  [ 1033.281011]  ___sys_sendmsg from sys_sendmsg+0x50/0x98
  [ 1033.286181]  sys_sendmsg from ret_fast_syscall+0x0/0x1c
  [ 1033.291437] Exception stack(0xf0fd9fa8 to 0xf0fd9ff0)
  [ 1033.296509] 9fa0:                   00000000 beae6ea8 0000000d beae6ea8 00000000 00000000
  [ 1033.304706] 9fc0: 00000000 beae6ea8 b5e2f4d0 00000128 00000000 0067a000 beae7000 b4901848
  [ 1033.312899] 9fe0: 00000128 beae6e78 b69202c9 b6921676
  [ 1033.318676] irq event stamp: 1038571
  [ 1033.322440] hardirqs last  enabled at (1038595): [<c019674c>] __up_console_sem+0x50/0x60
  [ 1033.330580] hardirqs last disabled at (1038602): [<c0196738>] __up_console_sem+0x3c/0x60
  [ 1033.338798] softirqs last  enabled at (1038592): [<c01017b4>] __do_softirq+0x2a4/0x5fc
  [ 1033.346886] softirqs last disabled at (1038579): [<c012ec04>] __irq_exit_rcu+0x138/0x17c
  [ 1033.355103] ---[ end trace 0000000000000000 ]---
  [ 1033.739995] rtw_8822cu 1-1:1.2: error beacon valid
  [ 1033.745988] rtw_8822cu 1-1:1.2: failed to download rsvd page
  [ 1033.763797] rtw_8822cu 1-1:1.2: failed to download firmware

Comment 4 Ping-Ke Shih 2023-04-06 02:34:48 UTC

Sascha has a patch similar to this. Could you give it a try: 


[1] https://lore.kernel.org/linux-wireless/20230404072508.578056-1-s.hauer@pengutronix.de/T/#m54b7c8c604b91cfce470fcec8fc7d4c20f3056c9

Comment 5 Petter Mabäcker 2023-04-06 10:51:36 UTC

(In reply to Ping-Ke Shih from comment #4)
> Sascha has a patch similar to this. Could you give it a try: 
> 
> 
> [1]
> https://lore.kernel.org/linux-wireless/20230404072508.578056-1-s.
> hauer@pengutronix.de/T/#m54b7c8c604b91cfce470fcec8fc7d4c20f3056c9

Yes, like mentioned in my latest comment I have tried using patch in [2], but still get the same problem (besides that the flooding of "timed out to flush queue 2" don't appear anymore). Any ideas what might cause this? 

In below thread [1] you can see another problem that also among other things causes the "failed to get tx report from firmware" to appear.

[1] https://lkml.kernel.org/linux-wireless/188007.70407276-sendEmail@petterwork
[2] https://lore.kernel.org/linux-wireless/20230404072508.578056-1-s.hauer@pengutronix.de/T/#m54b7c8c604b91cfce470fcec8fc7d4c20f3056c9

Comment 6 Petter Mabäcker 2023-05-26 13:19:36 UTC

Ping-Ke Shih, or someone else. Any new about this? Still have problems with this. More or less each time I run rescan the driver stop working.

~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=14.4 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=119 time=15.1 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 14.377/14.746/15.116/0.369 ms

~# sudo nmcli dev wifi rescan
[ 5359.184667] rtw_8822cu 1-1:1.2: failed to get tx report from firmware

~# ping 8.8.8.8 <-- stops working
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

^C
--- 8.8.8.8 ping statistics ---
11 packets transmitted, 0 received, 100% packet loss, time 10407ms

~# ip addr
...
wlx34c9f08deb60
       valid_lft 7159sec preferred_lft 7159sec
    inet6 fe80::3bc3:2caf:608a:2e32/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
...
[ 5389.664909] rtw_8822cu 1-1:1.2: failed to get tx report from firmware

Comment 7 Petter Mabäcker 2023-05-26 14:11:48 UTC

(In reply to Petter Mabäcker from comment #6)
> Ping-Ke Shih, or someone else. Any new about this? Still have problems with
> this. More or less each time I run rescan the driver stop working.
> 
> ~# ping 8.8.8.8
> PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> 64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=14.4 ms
> 64 bytes from 8.8.8.8: icmp_seq=2 ttl=119 time=15.1 ms
> ^C
> --- 8.8.8.8 ping statistics ---
> 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
> rtt min/avg/max/mdev = 14.377/14.746/15.116/0.369 ms
> 
> ~# sudo nmcli dev wifi rescan
> [ 5359.184667] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
> 
> ~# ping 8.8.8.8 <-- stops working
> PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> 
> ^C
> --- 8.8.8.8 ping statistics ---
> 11 packets transmitted, 0 received, 100% packet loss, time 10407ms
> 
> ~# ip addr
> ...
> wlx34c9f08deb60
>        valid_lft 7159sec preferred_lft 7159sec
>     inet6 fe80::3bc3:2caf:608a:2e32/64 scope link noprefixroute 
>        valid_lft forever preferred_lft forever
> ...
> [ 5389.664909] rtw_8822cu 1-1:1.2: failed to get tx report from firmware

Just a note. From what I can tell, this seems to be similar to the situation in [1], where it seems to work fine on a more powerful machine such as i.MX8/RPi4 but I get problems on slower single core machines such as i.MX6 SoloX etc. Hope this can help in troubleshooting the issue.

Comment 8 Petter Mabäcker 2023-05-26 14:12:20 UTC

(In reply to Petter Mabäcker from comment #7)
> (In reply to Petter Mabäcker from comment #6)
> > Ping-Ke Shih, or someone else. Any new about this? Still have problems with
> > this. More or less each time I run rescan the driver stop working.
> > 
> > ~# ping 8.8.8.8
> > PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> > 64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=14.4 ms
> > 64 bytes from 8.8.8.8: icmp_seq=2 ttl=119 time=15.1 ms
> > ^C
> > --- 8.8.8.8 ping statistics ---
> > 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
> > rtt min/avg/max/mdev = 14.377/14.746/15.116/0.369 ms
> > 
> > ~# sudo nmcli dev wifi rescan
> > [ 5359.184667] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
> > 
> > ~# ping 8.8.8.8 <-- stops working
> > PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> > 
> > ^C
> > --- 8.8.8.8 ping statistics ---
> > 11 packets transmitted, 0 received, 100% packet loss, time 10407ms
> > 
> > ~# ip addr
> > ...
> > wlx34c9f08deb60
> >        valid_lft 7159sec preferred_lft 7159sec
> >     inet6 fe80::3bc3:2caf:608a:2e32/64 scope link noprefixroute 
> >        valid_lft forever preferred_lft forever
> > ...
> > [ 5389.664909] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
> 
> Just a note. From what I can tell, this seems to be similar to the situation
> in [1], where it seems to work fine on a more powerful machine such as
> i.MX8/RPi4 but I get problems on slower single core machines such as i.MX6
> SoloX etc. Hope this can help in troubleshooting the issue.

I forgot the reference :) [1] =
https://lore.kernel.org/linux-wireless/20230526055551.1823094-1-petter@technux.se/T/#t

Comment 9 Petter Mabäcker 2023-05-30 15:22:11 UTC

(In reply to Petter Mabäcker from comment #8)
> (In reply to Petter Mabäcker from comment #7)
> > (In reply to Petter Mabäcker from comment #6)
> > > Ping-Ke Shih, or someone else. Any new about this? Still have problems
> with
> > > this. More or less each time I run rescan the driver stop working.
> > > 
> > > ~# ping 8.8.8.8
> > > PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> > > 64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=14.4 ms
> > > 64 bytes from 8.8.8.8: icmp_seq=2 ttl=119 time=15.1 ms
> > > ^C
> > > --- 8.8.8.8 ping statistics ---
> > > 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
> > > rtt min/avg/max/mdev = 14.377/14.746/15.116/0.369 ms
> > > 
> > > ~# sudo nmcli dev wifi rescan
> > > [ 5359.184667] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
> > > 
> > > ~# ping 8.8.8.8 <-- stops working
> > > PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> > > 
> > > ^C
> > > --- 8.8.8.8 ping statistics ---
> > > 11 packets transmitted, 0 received, 100% packet loss, time 10407ms
> > > 
> > > ~# ip addr
> > > ...
> > > wlx34c9f08deb60
> > >        valid_lft 7159sec preferred_lft 7159sec
> > >     inet6 fe80::3bc3:2caf:608a:2e32/64 scope link noprefixroute 
> > >        valid_lft forever preferred_lft forever
> > > ...
> > > [ 5389.664909] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
> > 
> > Just a note. From what I can tell, this seems to be similar to the
> situation
> > in [1], where it seems to work fine on a more powerful machine such as
> > i.MX8/RPi4 but I get problems on slower single core machines such as i.MX6
> > SoloX etc. Hope this can help in troubleshooting the issue.
> 
> I forgot the reference :) [1] =
> https://lore.kernel.org/linux-wireless/20230526055551.1823094-1-
> petter@technux.se/T/#t

Some additional findings.. When using the patch in [1] the problems occurs more seldom. But I have found out that disabling HW offload scan and use sw instead solves the problem on my i.MX6 SoloX board at least. I thought doing it in sw would be worse from a performance perspective. But it appears that the issue is related to HW offload scan, when running of slower systems/usb(?). Any theories around this? For the time being I have a way forward by avoid using HW offload scan, even if that is a bit sad, since I want to make use of it if possible..

[1] https://lore.kernel.org/linux-wireless/20230530130917.2716182-1-petter@technux.se/T/#t

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