[PATCH v3] wifi: ath12k: fix incorrect HT/VHT/HE/EHT MCS reporting in monitor mode

[Rameshkumar Sundaram]

On 5/7/2026 7:23 AM, kwan1996 wrote:
> From: Kwan Lai Chee Hou <laicheehou9 at gmail.com>
> 
> In monitor mode, the driver incorrectly assigns the legacy rate
> to the rate_idx field of the radiotap header for HT/VHT/HE/EHT
> frames, ignoring the actual MCS value parsed from the hardware.
> 
> This causes packet analyzers (like Wireshark) to display incorrect
> MCS values (e.g., legacy base rates instead of the true MCS).
> 
> Fix this by assigning ppdu_info->mcs as the default rate_mcs
> in ath12k_dp_mon_fill_rx_rate(), and remove rate_idx assignments in
> ath12k_dp_mon_update_radiotap() to preserve
> the previously calculated MCS values (including the HT NSS offset).
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=220864
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ
> 
> Signed-off-by: Kwan Lai Chee Hou <laicheehou9 at gmail.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram at oss.qualcomm.com>