OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity High
  • Priority Very Low
  • Reported Version Trunk
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Jean-Pierre Tosoni - 16.07.2019

FS#2391 - mac80211: ath9k AP fails to honour client's power save mode


I am using one device in AP mode, the other in client mode.
The client uses wpa_supplicant to do background scan to other channels that the data channel.
I am running iperf (UDP) from the AP to the client.

My device is home-made, Cavium development board-based, equipped with Compex WLE350NX.
It works correctly with kernel 3.18 and the 2015 wireless backport.
I updated to kernel 4.9 and the wireless backport 4.19.32-1, the last one from the trunk. (previously I used backport-2017-11-01 with the same result).

I am running wireshark with Airpcap to spy the wireless link.


* When the client scans offchannel, it correctly sends nullfunc frames around the offchannel period, with the PM bit set then unset.

* However, during this time, the AP continues to send data to the client.


* This results in a lot of lost frames, though I set the powersave buffers to high values on the AP side.

After some research I saw that the same kind of problem was fixed several times(*), but since there where so many changes in the queue management, I cannot really compare his work and the current state of the driver.

Any idea / patch / research directions ?



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