wifi: rtl8xxxu: update rate mask per sta

Until now, rtl8xxxu_watchdog_callback() only fetches RSSI and updates
the rate mask in station mode. This means, in AP mode only the default
rate mask is used.

In order to have the rate mask reflect the actual connection quality,
extend rtl8xxxu_watchdog_callback() to iterate over every sta. Like in
the rtw88 driver, add a function to collect all currently present stas
and then iterate over a list of copies to ensure no RCU lock problems
for register access via USB. Remove the existing RCU lock in
rtl8xxxu_refresh_rate_mask().

Since the currently used ieee80211_ave_rssi() is only for 'vif', add
driver-level tracking of RSSI per sta.
Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240205093040.1941140-1-martin.kaistra@linutronix.de

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h

@@ -6,6 +6,7 @@
  */
 
 #include <asm/byteorder.h>
+#include <linux/average.h>
 
 #define RTL8XXXU_DEBUG_REG_WRITE	0x01
 #define RTL8XXXU_DEBUG_REG_READ		0x02
@@ -1858,6 +1859,8 @@ struct rtl8xxxu_priv {
 	int next_mbox;
 	int nr_out_eps;
 
+	/* Ensure no added or deleted stas while iterating */
+	struct mutex sta_mutex;
 	struct mutex h2c_mutex;
 	/* Protect the indirect register accesses of RTL8710BU. */
 	struct mutex syson_indirect_access_mutex;
@@ -1892,7 +1895,6 @@ struct rtl8xxxu_priv {
 	u8 pi_enabled:1;
 	u8 no_pape:1;
 	u8 int_buf[USB_INTR_CONTENT_LENGTH];
-	u8 rssi_level;
 	DECLARE_BITMAP(tx_aggr_started, IEEE80211_NUM_TIDS);
 	DECLARE_BITMAP(tid_tx_operational, IEEE80211_NUM_TIDS);
 
@@ -1913,11 +1915,15 @@ struct rtl8xxxu_priv {
 	DECLARE_BITMAP(cam_map, RTL8XXXU_MAX_SEC_CAM_NUM);
 };
 
+DECLARE_EWMA(rssi, 10, 16);
+
 struct rtl8xxxu_sta_info {
 	struct ieee80211_sta *sta;
 	struct ieee80211_vif *vif;
 
 	u8 macid;
+	struct ewma_rssi avg_rssi;
+	u8 rssi_level;
 };
 
 struct rtl8xxxu_vif {