qcacld-3.0: Add bug_on if 5 consecutive ll_stats requests fails

If ll_stats command does not receive response from fw continuously
for some time then there is no way to determine the actual reason
of this comamand failure if the logs are overwritten.

With this change, add bug_on and trigger recovery after 5
continuous command failures so that the current logs are captured
to analyse the issue.

Change-Id: I8f2f08d598c25ccea5ecd4b02c86e1069daeb6e0
CRs-Fixed: 3106087

core/hdd/inc/wlan_hdd_main.h

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2012-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -1462,6 +1462,7 @@ struct hdd_adapter {
 
 #ifdef WLAN_FEATURE_LINK_LAYER_STATS
 	bool is_link_layer_stats_set;
+	uint8_t ll_stats_failure_count;
 #endif
 	uint8_t link_status;
 	uint8_t upgrade_udp_qos_threshold;

core/hdd/src/wlan_hdd_stats.c

@@ -90,6 +90,7 @@
 #endif /* kernel version less than 4.0.0 && no_backport */
 
 #define HDD_LINK_STATS_MAX		5
+#define HDD_MAX_ALLOWED_LL_STATS_FAILURE	5
 
 /* 11B, 11G Rate table include Basic rate and Extended rate
  * The IDX field is the rate index
@@ -2096,8 +2097,10 @@ static int wlan_hdd_send_ll_stats_req(struct hdd_adapter *adapter,
 	}
 	ret = osif_request_wait_for_response(request);
 	if (ret) {
-		hdd_err("Target response timed out request id %d request bitmap 0x%x",
-			priv->request_id, priv->request_bitmap);
+		adapter->ll_stats_failure_count++;
+		hdd_err("Target response timed out request id %d request bitmap 0x%x ll_stats failure count %d",
+			priv->request_id, priv->request_bitmap,
+			adapter->ll_stats_failure_count);
 		qdf_spin_lock(&priv->ll_stats_lock);
 		priv->request_bitmap = 0;
 		qdf_spin_unlock(&priv->ll_stats_lock);
@@ -2105,6 +2108,7 @@ static int wlan_hdd_send_ll_stats_req(struct hdd_adapter *adapter,
 		ret = -ETIMEDOUT;
 	} else {
 		hdd_update_station_stats_cached_timestamp(adapter);
+		adapter->ll_stats_failure_count = 0;
 	}
 
 	qdf_spin_lock(&priv->ll_stats_lock);
@@ -2128,6 +2132,12 @@ exit:
 
 	qdf_runtime_pm_allow_suspend(&hdd_ctx->runtime_context.stats);
 
+	if (adapter->ll_stats_failure_count >=
+					HDD_MAX_ALLOWED_LL_STATS_FAILURE) {
+		cds_trigger_recovery(QDF_STATS_REQ_TIMEDOUT);
+		adapter->ll_stats_failure_count = 0;
+	}
+
 	return ret;
 }