wifi: iwlwifi: mvm: Keep connection in case of missed beacons during RX

The client needs to disconnect from AP in case of more than 19 missed
beacons only if no data is coming from that AP, otherwise it needs to
stay connected.
Signed-off-by: Daniel Amosi <amosi.daniel@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240205211151.080195242c18.Ib166fc4e46666165a88e673a4a196cb8f18fdec4@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c

 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * Copyright (C) 2012-2014, 2018-2023 Intel Corporation
+ * Copyright (C) 2012-2014, 2018-2024 Intel Corporation
  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
  * Copyright (C) 2015-2017 Intel Deutschland GmbH
  */
@@ -1626,8 +1626,16 @@ void iwl_mvm_rx_missed_beacons_notif(struct iwl_mvm *mvm,
 	 * TODO: the threshold should be adjusted based on latency conditions,
 	 * and/or in case of a CS flow on one of the other AP vifs.
 	 */
-	if (rx_missed_bcon > IWL_MVM_MISSED_BEACONS_THRESHOLD_LONG) {
-		iwl_mvm_connection_loss(mvm, vif, "missed beacons");
+	if (rx_missed_bcon >= IWL_MVM_MISSED_BEACONS_THRESHOLD_LONG) {
+		if (rx_missed_bcon_since_rx >= IWL_MVM_MISSED_BEACONS_SINCE_RX_THOLD) {
+			iwl_mvm_connection_loss(mvm, vif, "missed beacons");
+		} else {
+			IWL_WARN(mvm,
+				 "missed beacons exceeds threshold, but receiving data. Stay connected, Expect bugs.\n");
+			IWL_WARN(mvm,
+				 "missed_beacons:%d, missed_beacons_since_rx:%d\n",
+				 rx_missed_bcon, rx_missed_bcon_since_rx);
+		}
 	} else if (rx_missed_bcon_since_rx > IWL_MVM_MISSED_BEACONS_THRESHOLD) {
 		if (!iwl_mvm_has_new_tx_api(mvm))
 			ieee80211_beacon_loss(vif);

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -40,8 +40,9 @@
 #define IWL_MVM_MAX_ADDRESSES		5
 /* RSSI offset for WkP */
 #define IWL_RSSI_OFFSET 50
+#define IWL_MVM_MISSED_BEACONS_SINCE_RX_THOLD 4
 #define IWL_MVM_MISSED_BEACONS_THRESHOLD 8
-#define IWL_MVM_MISSED_BEACONS_THRESHOLD_LONG 16
+#define IWL_MVM_MISSED_BEACONS_THRESHOLD_LONG 19
 
 /* A TimeUnit is 1024 microsecond */
 #define MSEC_TO_TU(_msec)	(_msec*1000/1024)