wcn6855 2.1 - slow download speed on any pairwise cipher except CCMP

[Baochen Qiang]

On 4/1/2024 10:53 PM, Jeff Johnson wrote:
> On 3/31/2024 8:49 AM, Yaroslav Isakov wrote:
>> Hello! When I tried to switch my OpenWRT router from default CCMP
>> pairwise cipher to any other, supported by both my router (Asus
>> TUF-AX6000) and my laptop (Thinkpat T14 Gen 4 AMD with WCN6855 2.1), I
>> saw that download dropped from 1Gbit/s to 100 MBit/s. When I changed
>> back to CCMP, download speed recovered back to 1Gbit/s. Upload speed
>> is good, though, for all ciphers - 1Gbit/s.
>>
>> Initially, I thought, that issue with either router hardware, or
>> openwrt driver - but, I tested the same settings on another laptop -
>> T14 Gen3 Intel - and with Intel WIFI, both download and upload speed
>> was 1Gbit/s on any pairwise cipher.
>>
>> This issue is 100% reproducible for me, it happens all the times I'm
>> switching to any pairwise cipher other than CCMP.
>>
>> I'm on Linux 6.7.6, compiled from sources on Gentoo.
I'm not familiar with Gentoo, is there any private changes in it 
compared to upstream ath11k? If there indeed is, could you try Kalle's 
ath11k tree?

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/

>>
>> Here is my dmesg for ath11k:
>> [   13.092519] ath11k_pci 0000:02:00.0: BAR 0: assigned [mem
>> 0x78600000-0x787fffff 64bit]
>> [   13.093400] ath11k_pci 0000:02:00.0: enabling device (0000 -> 0002)
>> [   13.095723] ath11k_pci 0000:02:00.0: MSI vectors: 32
>> [   13.096260] ath11k_pci 0000:02:00.0: wcn6855 hw2.1
>> [   13.974707] ath11k_pci 0000:02:00.0: chip_id 0x12 chip_family 0xb
>> board_id 0xff soc_id 0x400c1211
>> [   13.974732] ath11k_pci 0000:02:00.0: fw_version 0x1106196e
>> fw_build_timestamp 2024-01-12 11:30 fw_build_id
>> WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
>> [   14.315774] ath11k_pci 0000:02:00.0: Failed to set the requested
>> Country regulatory setting
>> [   14.316046] ath11k_pci 0000:02:00.0: Failed to set the requested
>> Country regulatory setting
>> [  337.889222] ath11k_pci 0000:02:00.0: failed to enqueue rx buf: -28
>>
> 
> There was another reporting of that error in this thread:
> https://lore.kernel.org/all/5c63a3a2-29fe-444c-96f1-f87c89d7af39@gmail.com/
> 
I don't think this is the same issue as reported by James there although 
same error message. For now I don't know the root cause to that message 
but it's unlikely it causes some tput issue.

Let's wait for Yasoslav verifying it on latest ath.git.

> +Baochen Qiang for awareness
> 
> /jeff