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

[kwan1996]

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 instead of ppdu_info->rate
for HT/VHT/HE/EHT frame types in ath12k_dp_mon_fill_rx_rate()
and ath12k_dp_mon_update_radiotap().

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: kwan1996 <laicheehou9 at gmail.com>
---
 drivers/net/wireless/ath/ath12k/dp_mon.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/dp_mon.c b/drivers/net/wireless/ath/ath12k/dp_mon.c
index 39d1967..729b390 100644
--- a/drivers/net/wireless/ath/ath12k/dp_mon.c
+++ b/drivers/net/wireless/ath/ath12k/dp_mon.c
@@ -1925,6 +1925,7 @@ ath12k_dp_mon_fill_rx_rate(struct ath12k *ar,
 		}
 		break;
 	case RX_MSDU_START_PKT_TYPE_11N:
+	  rate_mcs = ppdu_info->mcs;
 		rx_status->encoding = RX_ENC_HT;
 		if (rate_mcs > ATH12K_HT_MCS_MAX) {
 			ath12k_warn(ar->ab,
@@ -1937,6 +1938,7 @@ ath12k_dp_mon_fill_rx_rate(struct ath12k *ar,
 			rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 		break;
 	case RX_MSDU_START_PKT_TYPE_11AC:
+	  rate_mcs = ppdu_info->mcs;
 		rx_status->encoding = RX_ENC_VHT;
 		rx_status->rate_idx = rate_mcs;
 		if (rate_mcs > ATH12K_VHT_MCS_MAX) {
@@ -1949,6 +1951,7 @@ ath12k_dp_mon_fill_rx_rate(struct ath12k *ar,
 			rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 		break;
 	case RX_MSDU_START_PKT_TYPE_11AX:
+	  rate_mcs = ppdu_info->mcs;
 		rx_status->rate_idx = rate_mcs;
 		if (rate_mcs > ATH12K_HE_MCS_MAX) {
 			ath12k_warn(ar->ab,
@@ -1960,6 +1963,7 @@ ath12k_dp_mon_fill_rx_rate(struct ath12k *ar,
 		rx_status->he_gi = ath12k_he_gi_to_nl80211_he_gi(sgi);
 		break;
 	case RX_MSDU_START_PKT_TYPE_11BE:
+	  rate_mcs = ppdu_info->mcs;
 		rx_status->rate_idx = rate_mcs;
 		if (rate_mcs > ATH12K_EHT_MCS_MAX) {
 			ath12k_warn(ar->ab,
@@ -2259,13 +2263,13 @@ static void ath12k_dp_mon_update_radiotap(struct ath12k *ar,
 		rxs->encoding = RX_ENC_HE;
 		ptr = skb_push(mon_skb, sizeof(struct ieee80211_radiotap_he));
 		ath12k_dp_mon_rx_update_radiotap_he(ppduinfo, ptr);
-		rxs->rate_idx = ppduinfo->rate;
+		rxs->rate_idx = ppduinfo->mcs;
 	} else if (ppduinfo->vht_flags) {
 		rxs->encoding = RX_ENC_VHT;
-		rxs->rate_idx = ppduinfo->rate;
+		rxs->rate_idx = ppduinfo->mcs;
 	} else if (ppduinfo->ht_flags) {
 		rxs->encoding = RX_ENC_HT;
-		rxs->rate_idx = ppduinfo->rate;
+		rxs->rate_idx = ppduinfo->mcs;
 	} else {
 		rxs->encoding = RX_ENC_LEGACY;
 		sband = &ar->mac.sbands[rxs->band];
-- 
2.34.1