[PATCH ath-next] wifi: ath12k: preserve PPDU state across monitor status buffers

[Baochen Qiang]

On 8/28/2026 2:55 PM, Kang Yang wrote:
> A monitor PPDU may span multiple status buffers. However,
> __ath12k_wifi7_dp_mon_process_ring() clears mon_ppdu_info before
> processing every buffer.
> 
> As a result, continuation buffers lose PPDU state collected from
> earlier buffers, including ppdu_id and PHY metadata.
> 
> This can cause monitor RX processing to fail when
> ath12k_wifi7_dp_rx_mon_dest_process() observes a PPDU ID mismatch
> between status and destination rings, preventing MSDUs from being
> delivered. It can also produce incomplete EHT metadata that triggers
> warnings from mac80211:
> 	Rate marked as an EHT rate but data is invalid: MCS:0, NSS:0
> 
> ath12k_wifi7_dp_mon_srng_process() already tracks status TLV
> continuations via ppdu_continuation. Apply the same logic here and
> only reinitialize mon_ppdu_info when starting a new PPDU.
> 
> mon_ppdu_info persists across ar->monitor_started transitions. If
> monitor mode stops while a PPDU is mid-continuation, ppdu_continuation
> stays set and could leak into the next monitor session. Reset it
> when monitor mode starts.
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
> 
> Fixes: 78d3d907d0f1 ("wifi: ath12k: add support to reap and process monitor status ring")
> Signed-off-by: Kang Yang <kang.yang at oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang at oss.qualcomm.com>