[PATCH ath-next] wifi: ath12k: change MAC buffer ring size to 4096

[Baochen Qiang]

On 10/22/2026 9:38 PM, Shawn Guo wrote:
> On Thu, Oct 22, 2026 at 07:00:31PM +0800, Baochen Qiang wrote:
>>
>>
>> On 10/22/2026 5:20 PM, Shawn Guo wrote:
>>> On Thu, Oct 22, 2026 at 10:30:45AM +0800, Baochen Qiang wrote:
>>>>
>>>>
>>>> On 10/20/2026 4:53 PM, Shawn Guo wrote:
>>>>> + linux-arm-msm
>>>>>
>>>>> On Tue, Jun 09, 2026 at 08:13:58PM -0700, Yingying Tang wrote:
>>>>>> For WCN7850, MAC buffer ring size is updated to 2048 in
>>>>>> 955df16f2a4c3 ("wifi: ath12k: change MAC buffer ring size to 2048")
>>>>>> to increase peak throughput.
>>>>>>
>>>>>> But during the RX process, a phenomenon can still be observed where
>>>>>> the throughput drops by about 30% from its peak value and then recovers,
>>>>>> and this behavior repeats during RX.
>>>>>>
>>>>>> After increasing MAC buffer ring size to 4096, the data rate drop has
>>>>>> gone.
>>>>>>
>>>>>> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3
>>>>>>
>>>>>> Signed-off-by: Yingying Tang <yingying.tang at oss.qualcomm.com>
>>>>>
>>>>> FYI, in case someone else runs into this: with this change (merged in
>>>>> v7.3), WiFi on my Lenovo Yoga Slim 7x (X1E80100, WCN7850 hw2.0) stopped
>>>>> working with the older firmware that Debian trixie still ships
>>>>> (firmware-atheros 20250410-2):
>>>>>
>>>>>   WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
>>>>>
>>>>> Probe and firmware download succeed, but every WMI command times out
>>>>> once the interface is brought up:
>>>>>
>>>>>   ath12k_wifi7_pci 0004:01:00.0: wmi command 16387 timeout
>>>>>   ath12k_wifi7_pci 0004:01:00.0: failed to send WMI_PDEV_SET_PARAM cmd
>>>>>   ath12k_wifi7_pci 0004:01:00.0: failed to enable PMF QOS: -11
>>>>>   ath12k_wifi7_pci 0004:01:00.0: fail to start mac operations in pdev idx 0 ret -11
>>>>>
>>>>> Bisecting ath12k between v7.2 and v7.3 lands on this commit, and
>>>>> reverting it on v7.3 brings WiFi back with the old firmware.
>>>>>
>>>>> Unmodified v7.3 works fine after updating to the current linux-firmware
>>>>> image:
>>>>>
>>>>>   WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
>>>>>
>>>>> On Debian trixie that one is available from trixie-backports
>>>>> (firmware-atheros 20260916-1~bpo13+1).
>>>>>
>>>>> So nothing needs fixing on the driver side. I'm just leaving this here
>>>>> so that anyone who sees "wmi command ... timeout" on WCN7850 after a
>>>>> kernel upgrade knows to update the firmware first.
>>>>
>>>> Hi Shawn, thanks for reporting this. I just had a quick test
>>>> WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 with the latest ath tree
>>>> (ath-202610191908), everything looks good, simple connection and ping pass, I don't see
>>>> any ath12k warning.
>>>>
>>>> The firmware images I am using comes from the first commit adding WCN7850 firmware:
>>>>
>>>> 	fb04a7f4b750 ("ath12k: add new driver and firmware for WCN7850")
>>>>
>>>> and the md5 values are:
>>>>
>>>> linux-firmware/ath12k/WCN7850/hw2.0$ md5sum ./*
>>>> d3750b67b1013fe82358d0538fb131b0  ./amss.bin
>>>> c79c410d585360000c0490f16fda43e2  ./board-2.bin
>>>> 73056f1d2aff886ce9bff313f455e963  ./m3.bin
>>>> d0ee61498bf1a205147cdbcf645391e7  ./Notice.txt
>>>>
>>>> can you share the md5 values of your images?
>>>
>>> Hi Baochen,
>>>
>>> Here are md5 values of the old firmware shipped by trixie firmware-atheros
>>> 20250410-2.
>>>
>>> $ md5sum /lib/firmware/ath12k/WCN7850/hw2.0/*
>>> d3750b67b1013fe82358d0538fb131b0  /lib/firmware/ath12k/WCN7850/hw2.0/amss.bin
>>> 5dacdfbe6c3c25d9e0605be8a9f1f6e4  /lib/firmware/ath12k/WCN7850/hw2.0/board-2.bin
>>
>> this is different from mine, can you try mine?
> 
> Are you sure this board file works for my Lenovo Yoga Slim 7x laptop?

actually not, my board-2.bin may lack the BDF for your machine