linux-kernel - Re: [PATCH ath-next] wifi: ath12k: limit WMI_SCAN_CHAN_LIST

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Message-ID: <187c8be7-23ef-4bcb-9ac1-cf1882fe3e62@8devices.com>
Date: Thu, 13 Mar 2025 12:10:29 +0200
From: Mantas <mantas@...vices.com>
To: Vasanthakumar Thiagarajan <quic_vthiagar@...cinc.com>,
 ath12k@...ts.infradead.org
Cc: Johannes Berg <johannes@...solutions.net>,
 Jeff Johnson <jjohnson@...nel.org>, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH ath-next] wifi: ath12k: limit WMI_SCAN_CHAN_LIST_CMDID
 argument size

On 2025-03-13 11:45, Vasanthakumar Thiagarajan wrote:
>
>
> On 3/10/2025 6:58 PM, Mantas Pucka wrote:
>> When using BDF with both 5GHz and 6GHz bands enabled on QCN9274, 
>> interface
>> fails to start. It happens because FW fails to process
>> WMI_SCAN_CHAN_LIST_CMDID with argument size >2048, resulting in a 
>> command
>> timeout. The current code allows splitting channel list across 
>> multiple WMI
>> commands but uses WMI max_msg_len (4096) as chunk size, which is 
>> still too
>
> Did you have any private changes to increase the message_len from current
> 2048 ot 4096 bytes? As mentioned in a reply for your other patch, 
> multi-band
> in qcn9274 requires additional changes in driver, only scan mode is 
> supported
> even with those changes.
>
No private changes, using unmodified FW from:

https://git.codelinaro.org/clo/ath-firmware/ath12k-firmware/-/tree/main/QCN9274/hw2.0/1.4.1/WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1

max_msg_len comes from FW initialization message:

ath12k_htc_connect_service max_msg_len=0 flags_len=0x0 assigned_eid=0
boot htc service 'Control' ul pipe 0 dl pipe 1 eid 0 ready
ath12k_htc_connect_service max_msg_len=2040 flags_len=0x7f80100 
assigned_eid=1
boot htc service 'HTT Data' ul pipe 4 dl pipe 1 eid 1 ready
ath12k_htc_connect_service max_msg_len=4088 flags_len=0xff80200 
assigned_eid=2
boot htc service 'WMI' ul pipe 3 dl pipe 2 eid 2 ready


Is support for multi-band AP/STA limited by FW? AFAIK it works with 
proprietary driver.


Mantas