[v2,0/3] wifi: rtw88: USB fixes

Message

Sascha Hauer Feb. 10, 2023, 11:16 a.m. UTC

This series addresses issues for the recently added RTW88 USB support
reported by Andreas Henriksson and also our customer.

The hardware can't handle urbs that have a size of multiple of the
bulkout_size (usually 512 bytes). The symptom is that the hardware
stalls completely. The issue can be reproduced by sending a suitably
sized ping packet from the device:

ping -s 394 <somehost>

(It's 394 bytes here on a RTL8822CU and RTL8821CU, the actual size may
differ on other chips, it was 402 bytes on a RTL8723DU)

Other than that qsel was not set correctly. The sympton here is that
only one of multiple bulk endpoints was used to send data.

Changes since v1:
- Use URB_ZERO_PACKET to let the USB host controller handle it automatically
  rather than working around the issue.

Sascha Hauer (3):
  wifi: rtw88: usb: Set qsel correctly
  wifi: rtw88: usb: send Zero length packets if necessary
  wifi: rtw88: usb: drop now unnecessary URB size check

 drivers/net/wireless/realtek/rtw88/usb.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

Comments

Andreas Henriksson Feb. 10, 2023, 6:19 p.m. UTC | #1

Hello Sacha Hauer,

Thanks alot for fixing this!

On Fri, Feb 10, 2023 at 12:16:29PM +0100, Sascha Hauer wrote:
> This series addresses issues for the recently added RTW88 USB support
> reported by Andreas Henriksson and also our customer.
> 
> The hardware can't handle urbs that have a size of multiple of the
> bulkout_size (usually 512 bytes). The symptom is that the hardware
> stalls completely. The issue can be reproduced by sending a suitably
> sized ping packet from the device:
> 
> ping -s 394 <somehost>
> 
> (It's 394 bytes here on a RTL8822CU and RTL8821CU, the actual size may
> differ on other chips, it was 402 bytes on a RTL8723DU)

I can confirm that with these patches applied that my LM842 dongle
now works reliably on my imx6sx board. On the same board the traffic
would previously usually stall after 80-130MB when downloading.

With patches applied I succesfully completed:
wget -O /dev/null http://speedtest.tele2.net/10GB.zip

Uploading did not seem to trigger the problem before but I still
tested and uploading a gigabyte was no problem using:
curl -T /dev/urandom http://speedtest.tele2.net/upload.php  -O /dev/null

Did not attempt the suggested ping method of reproducing on the old
system, but on the new kernel I could do
$ for a in $(seq 128 512); do ping -n -c 3 -s $a ping.sunet.se ; done
without any stalls.


Feel free to add either or both of:

Reported-by: Andreas Henriksson <[e-mail]>
Tested-by: Andreas Henriksson <[e-mail]>

> 
> Other than that qsel was not set correctly. The sympton here is that
> only one of multiple bulk endpoints was used to send data.
> 
> Changes since v1:
> - Use URB_ZERO_PACKET to let the USB host controller handle it automatically
>   rather than working around the issue.
> 
> Sascha Hauer (3):
>   wifi: rtw88: usb: Set qsel correctly
>   wifi: rtw88: usb: send Zero length packets if necessary
>   wifi: rtw88: usb: drop now unnecessary URB size check
> 
>  drivers/net/wireless/realtek/rtw88/usb.c | 18 +++---------------
>  1 file changed, 3 insertions(+), 15 deletions(-)
> 
> -- 
> 2.30.2
> 

Regards,
Andreas Henriksson