Potential Broadcast Issues After GTK Key Exchange on ath11k with IPQ8072A (QCN5024/QCN5054)

[Sebastian Gottschall]

Hi Remi

Am 19.12.2024 um 16:35 schrieb Remi Pommarel:
> Hi Steffen.
>
> On Thu, Dec 19, 2024 at 04:02:30PM +0100, Steffen Moser wrote:
>> Hello everyone,
>>
>> I've encountered a possible issue in a DD-WRT [1] setup where broadcast
>> packets stop being delivered after a GTK (Group Temporal Key) exchange. This
>> issue occurs on a system with the following hardware:
>>
>>      Access Point Hardware: DynaLink DL-WRX36
>>      Router Software: DD-WRT v3.0-r58819 std (12/13/24)
>>      CPU: Qualcomm IPQ8072A
>>      WiFi Chips: Qualcomm QCN5024 and Qualcomm QCN5054
>>      WiFi Driver: ath11k
>>      Firmware: WLAN.HK.2.12-01460-QCAHKSWPL_SILICONZ-1
>>      NSS FW version: NSS.FW.12.5-210-HK.R
>>      Kernel: Linux WL-AP-EG 6.6.64-rt29 #1791 SMP Thu Dec 12 16:41:51 +07
>> 2024 aarch64 DD-WRT
>>
>> The behavior is such that after a GTK exchange, the AP can get into a "weird
>> state". When being there, broadcast frames like ARP or mDNS are no longer
>> reliably delivered to connected clients while unicasts come still through.
>> In this "weird state", the channel quality (active time vs. busy time) goes
>> down and latencies to the still reachable WIFI clients rise.
> This looks a lot like an issue we hit a while back. There is this patch
> [0] from Qualcomm's wlan-open repository. It is a revert of [1]. Using
> that the issue was never reproduced. Maybe this can help.
>
> Also adding ath11k list.
>
> Regards.

thank you for that hint. i  will integrate it into dd-wrt asap

Sebastian

>