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From:   "petter@technux.se" <petter@technux.se>
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To:     "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Cc:     "s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
        "pkshih@realtek.com" <pkshih@realtek.com>,
        "tony0620emma@gmail.com" <tony0620emma@gmail.com>
Subject: rtw88: rtw8822cu (LM842) -> failed to get tx report from firmware
Date:   Thu, 6 Apr 2023 10:41:20 +0000
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Hi,

I have seen a very similar issue as Andreas. It was found when streaming a mender file (using mender install <url> from my arm device. But I have also managed to reproduce a similar issue by flooding the interface using iperf. 

on target:
$ sudo iperf -s -u

On host:
$ iperf -c <ip> -u -b 200M -t 300

Then it will almost instantly get problems causing the lm842 dongle to stop working.

I'm using below fw:
  $ sudo dmesg | grep 8822c
  [   19.282167] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cu_fw.bin
  [   19.299025] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cu_config.bin
  [   19.628570] rtw_8822cu 1-1:1.2: WOW Firmware version 9.9.4, H2C version 15
  [   19.641604] rtw_8822cu 1-1:1.2: Firmware version 9.9.15, H2C version 15


$ iperf -s -u
------------------------------------------------------------
Server listening on UDP port 5001
UDP buffer size:  176 KByte (default)
------------------------------------------------------------
[  415.791320] rtw_8822cu 1-1:1.2: failed to get rx_queue, overflow
[  415.797443] rtw_8822cu 1-1:1.2: failed to get rx_queue, overflow
[  415.803511] rtw_8822cu 1-1:1.2: failed to get rx_queue, overflow
[  415.809635] rtw_8822cu 1-1:1.2: failed to get rx_queue, overflow
[  438.102270] rtw_8822cu 1-1:1.2: failed to get tx report from firmware
[  441.446726] rtw_8822cu 1-1:1.2: failed to send h2c command
[  471.480932] rtw_8822cu 1-1:1.2: firmware failed to report density after scan


Any ideas what might be the cause of this? I have also tried to use the latest patch from Sascha that seems to be aimed to fix some issue I thought might have been related to this(https://lore.kernel.org/linux-wireless/20230404072508.578056-1-s.hauer@pengutronix.de/T/#m54b7c8c604b91cfce470fcec8fc7d4c20f3056c9), but still get same behavior.

BR,
Petter Mabäcker


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