[PATCH v3] wifi: ath12k: add support of station average signal strength

[Nicolas Escande]

This adds support for reporting to the kernel the average rssi. This is
done the same way as it was done in ath11k. A simple ewma (with the same
parameters) is updated with each rssi update.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Nicolas Escande <nico.escande at gmail.com>
---
v3:
  - rebased on ToT
  - now also handles db2dbm

v2: https://lore.kernel.org/ath12k/20250121093834.25132-1-nico.escande@gmail.com/
  - removed spurious exta new line at the beggining of core.h

v1: https://lore.kernel.org/ath12k/20250117172819.3357534-1-nico.escande@gmail.com/
  - initial version
---
 drivers/net/wireless/ath/ath12k/core.h   | 4 ++++
 drivers/net/wireless/ath/ath12k/dp_mon.c | 2 ++
 drivers/net/wireless/ath/ath12k/mac.c    | 8 ++++++++
 3 files changed, 14 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 28db100cfac0..2a53712bd606 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -15,6 +15,7 @@
 #include <linux/ctype.h>
 #include <linux/firmware.h>
 #include <linux/panic_notifier.h>
+#include <linux/average.h>
 #include "qmi.h"
 #include "htc.h"
 #include "wmi.h"
@@ -480,6 +481,8 @@ struct ath12k_wbm_tx_stats {
 	u64 wbm_tx_comp_stats[HAL_WBM_REL_HTT_TX_COMP_STATUS_MAX];
 };
 
+DECLARE_EWMA(avg_rssi, 10, 8)
+
 struct ath12k_link_sta {
 	struct ath12k_link_vif *arvif;
 	struct ath12k_sta *ahsta;
@@ -499,6 +502,7 @@ struct ath12k_link_sta {
 	u64 rx_duration;
 	u64 tx_duration;
 	u8 rssi_comb;
+	struct ewma_avg_rssi avg_rssi;
 	u8 link_id;
 	struct ath12k_rx_peer_stats *rx_stats;
 	struct ath12k_wbm_tx_stats *wbm_tx_stats;
diff --git a/drivers/net/wireless/ath/ath12k/dp_mon.c b/drivers/net/wireless/ath/ath12k/dp_mon.c
index 4e9a60181c06..d529229f2d0f 100644
--- a/drivers/net/wireless/ath/ath12k/dp_mon.c
+++ b/drivers/net/wireless/ath/ath12k/dp_mon.c
@@ -2002,6 +2002,7 @@ static void ath12k_dp_mon_rx_update_peer_su_stats(struct ath12k *ar,
 		return;
 
 	arsta->rssi_comb = ppdu_info->rssi_comb;
+	ewma_avg_rssi_add(&arsta->avg_rssi, ppdu_info->rssi_comb);
 
 	num_msdu = ppdu_info->tcp_msdu_count + ppdu_info->tcp_ack_msdu_count +
 		   ppdu_info->udp_msdu_count + ppdu_info->other_msdu_count;
@@ -2174,6 +2175,7 @@ ath12k_dp_mon_rx_update_user_stats(struct ath12k *ar,
 		return;
 
 	arsta->rssi_comb = ppdu_info->rssi_comb;
+	ewma_avg_rssi_add(&arsta->avg_rssi, ppdu_info->rssi_comb);
 
 	num_msdu = user_stats->tcp_msdu_count + user_stats->tcp_ack_msdu_count +
 		   user_stats->udp_msdu_count + user_stats->other_msdu_count;
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index e9663c6ac72c..807638d30e7b 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -5484,6 +5484,7 @@ static int ath12k_mac_station_add(struct ath12k *ar,
 		}
 	}
 
+	ewma_avg_rssi_init(&arsta->avg_rssi);
 	return 0;
 
 free_peer:
@@ -10200,6 +10201,13 @@ static void ath12k_mac_op_sta_statistics(struct ieee80211_hw *hw,
 		sinfo->signal = db2dbm ? signal : signal + ATH12K_DEFAULT_NOISE_FLOOR;
 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
 	}
+
+	sinfo->signal_avg = ewma_avg_rssi_read(&arsta->avg_rssi);
+
+	if (!db2dbm)
+		sinfo->signal_avg += ATH12K_DEFAULT_NOISE_FLOOR;
+
+	sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG);
 }
 
 static int ath12k_mac_op_cancel_remain_on_channel(struct ieee80211_hw *hw,
-- 
2.48.1