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

[Baochen Qiang]

On 6/4/2024 3:26 PM, Yaroslav Isakov wrote:
> Hello!
> 
> вт, 4 июн. 2024 г. в 03:55, Baochen Qiang <quic_bqiang at quicinc.com>:
>>
>>
>>
>> On 6/4/2024 5:29 AM, Yaroslav Isakov wrote:
>>> Hello! Thank you for patch! I tried to apply this patch on top of 6.9.3,
>>> but it failed to apply - what kernel version should I use, to test it?
>>>
>> That patch is based on ath-202405301555 tag of Kalle's ath.git:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/
>>
>> but I suppose it could also be applied cleanly on ToT of ath.git.
> Actually, it seems that when I was copying patch from patchwork,
> something went wrong. I properly downloaded it, and it applied (with
> few hunks) on top of 6.9.3. After rebuilding currently running kernel,
> and reloading driver - GCMP-256 finally started showing same speeds on
> download as on upload! Looks like the issue is fixed, thank you a lot!
Great it can fix  your issue and thanks for testing.

Jeff, as you pointed out internally in that patch, I will repost with necessary tags added.

>>
>>
>>> On Fri, 31 May 2024, 04:18 Baochen Qiang, <quic_bqiang at quicinc.com> wrote:
>>>
>>>>
>>>>
>>>> On 4/15/2024 7:26 PM, Yaroslav Isakov wrote:
>>>>> Hello!
>>>>>
>>>>> вс, 14 апр. 2024 г. в 10:12, Yaroslav Isakov <yaroslav.isakov at gmail.com
>>>>> :
>>>>>>
>>>>>> Hello!
>>>>>>
>>>>>> вт, 2 апр. 2024 г. в 02:35, Baochen Qiang <quic_bqiang at quicinc.com>:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 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/
>>>>>>>
>>>>>> Sorry, missed the message. Gentoo kernel I'm using is very close to
>>>>>> upstream. I will try ath11.git, and will report there, thank you.
>>>>>>
>>>>>
>>>>> I checked ath.git, master branch - it has the exact same behavior as
>>>>> kernel I used - 1Gbit download with CCMP, 100Mbit download with GCMP.
>>>>> For me, this issue is easily reproducible, it happens 100% if I'm
>>>>> switching to pairwise_cipher (and therefore, groupwise, too) other
>>>>> than CCMP.
>>>> I just submitted a patch which may fix this issue, could you merge it and
>>>> try again?
>>>>
>>>>
>>>> https://patchwork.kernel.org/project/linux-wireless/patch/20240531021228.2846-1-quic_bqiang@quicinc.com/
>>>>
>>>>>>>>>
>>>>>>>>> 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
>>>>
>>>