Add metrics for initial partial scan feature

This commit adds the metrics for initial partial scan feature

Bug: 153509887
Test: atest com.android.server.wifi
Change-Id: I2cbefaa64331ef14c532a48594cebe29d5c3aced

3 files changed, 104 insertions, 1 deletions

diff --git a/service/java/com/android/server/wifi/WifiConnectivityManager.java b/service/java/com/android/server/wifi/WifiConnectivityManager.java
index 3d2f3c58a..030121efd 100644
--- a/service/java/com/android/server/wifi/WifiConnectivityManager.java
+++ b/service/java/com/android/server/wifi/WifiConnectivityManager.java
@@ -182,6 +182,11 @@ public class WifiConnectivityManager {
     private boolean mPnoScanStarted = false;
     private boolean mPeriodicScanTimerSet = false;
     private boolean mDelayedPartialScanTimerSet = false;
+
+    // Used for Initial Scan metrics
+    private boolean mFailedInitialPartialScan = false;
+    private int mInitialPartialScanChannelCount;
+
     // Device configs
     private boolean mWaitForFullBandScanResults = false;
 
@@ -522,10 +527,20 @@ public class WifiConnectivityManager {
                     Log.i(TAG, "Connection attempted with the reduced initial scans");
                     schedulePeriodicScanTimer(
                             getScheduledSingleScanIntervalMs(mCurrentSingleScanScheduleIndex));
+                    mWifiMetrics.reportInitialPartialScan(mInitialPartialScanChannelCount, true);
+                    mInitialPartialScanChannelCount = 0;
                 } else {
                     Log.i(TAG, "Connection was not attempted, issuing a full scan");
                     startConnectivityScan(SCAN_IMMEDIATELY);
+                    mFailedInitialPartialScan = true;
                 }
+            } else if (mInitialScanState == INITIAL_SCAN_STATE_COMPLETE) {
+                if (mFailedInitialPartialScan && wasConnectAttempted) {
+                    // Initial scan failed, but following full scan succeeded
+                    mWifiMetrics.reportInitialPartialScan(mInitialPartialScanChannelCount, false);
+                }
+                mFailedInitialPartialScan = false;
+                mInitialPartialScanChannelCount = 0;
             }
         }
 
@@ -1135,6 +1150,7 @@ public class WifiConnectivityManager {
                 // Hence, we verify state before changing to AWIATING_RESPONSE
                 if (mInitialScanState == INITIAL_SCAN_STATE_START) {
                     setInitialScanState(INITIAL_SCAN_STATE_AWAITING_RESPONSE);
+                    mWifiMetrics.incrementInitialPartialScanCount();
                 }
                 // No scheduling for another scan (until we get the results)
                 return;
@@ -1239,6 +1255,8 @@ public class WifiConnectivityManager {
                 isFullBandScan = true;
                 // Skip the initial scan since no channel history available
                 setInitialScanState(INITIAL_SCAN_STATE_COMPLETE);
+            } else {
+                mInitialPartialScanChannelCount = settings.channels.length;
             }
         }
         settings.type = WifiScanner.SCAN_TYPE_HIGH_ACCURACY; // always do high accuracy scans.
diff --git a/service/java/com/android/server/wifi/WifiMetrics.java b/service/java/com/android/server/wifi/WifiMetrics.java
index 3f13e99fc..409293f9c 100644
--- a/service/java/com/android/server/wifi/WifiMetrics.java
+++ b/service/java/com/android/server/wifi/WifiMetrics.java
@@ -64,6 +64,7 @@ import com.android.server.wifi.proto.nano.WifiMetricsProto.ConnectToNetworkNotif
 import com.android.server.wifi.proto.nano.WifiMetricsProto.DeviceMobilityStatePnoScanStats;
 import com.android.server.wifi.proto.nano.WifiMetricsProto.ExperimentValues;
 import com.android.server.wifi.proto.nano.WifiMetricsProto.HealthMonitorMetrics;
+import com.android.server.wifi.proto.nano.WifiMetricsProto.InitPartialScanStats;
 import com.android.server.wifi.proto.nano.WifiMetricsProto.LinkProbeStats;
 import com.android.server.wifi.proto.nano.WifiMetricsProto.LinkProbeStats.ExperimentProbeCounts;
 import com.android.server.wifi.proto.nano.WifiMetricsProto.LinkProbeStats.LinkProbeFailureReasonCount;
@@ -463,6 +464,17 @@ public class WifiMetrics {
     private final IntHistogram mRxThroughputMbpsHistogramAbove2G =
             new IntHistogram(THROUGHPUT_MBPS_BUCKETS);
 
+    // Init partial scan metrics
+    private int mInitPartialScanTotalCount;
+    private int mInitPartialScanSuccessCount;
+    private int mInitPartialScanFailureCount;
+    private static final int[] INIT_PARTIAL_SCAN_HISTOGRAM_BUCKETS =
+            {1, 3, 5, 10};
+    private final IntHistogram mInitPartialScanSuccessHistogram =
+            new IntHistogram(INIT_PARTIAL_SCAN_HISTOGRAM_BUCKETS);
+    private final IntHistogram mInitPartialScanFailureHistogram =
+            new IntHistogram(INIT_PARTIAL_SCAN_HISTOGRAM_BUCKETS);
+
     // Wi-Fi off metrics
     private final WifiOffMetrics mWifiOffMetrics = new WifiOffMetrics();
 
@@ -3515,10 +3527,20 @@ public class WifiMetrics {
                         + mTxThroughputMbpsHistogramAbove2G);
                 pw.println("mRxThroughputMbpsHistogramAbove2G:\n"
                         + mRxThroughputMbpsHistogramAbove2G);
+
+                dumpInitPartialScanMetrics(pw);
             }
         }
     }
 
+    private void dumpInitPartialScanMetrics(PrintWriter pw) {
+        pw.println("mInitPartialScanTotalCount:\n" + mInitPartialScanTotalCount);
+        pw.println("mInitPartialScanSuccessCount:\n" + mInitPartialScanSuccessCount);
+        pw.println("mInitPartialScanFailureCount:\n" + mInitPartialScanFailureCount);
+        pw.println("mInitPartialScanSuccessHistogram:\n" + mInitPartialScanSuccessHistogram);
+        pw.println("mInitPartialScanFailureHistogram:\n" + mInitPartialScanFailureHistogram);
+    }
+
     private void printWifiUsabilityStatsEntry(PrintWriter pw, WifiUsabilityStatsEntry entry) {
         StringBuilder line = new StringBuilder();
         line.append("timestamp_ms=" + entry.timeStampMs);
@@ -3691,6 +3713,32 @@ public class WifiMetrics {
     }
 
     /**
+     * Increment initial partial scan count
+     */
+    public void incrementInitialPartialScanCount() {
+        synchronized (mLock) {
+            mInitPartialScanTotalCount++;
+        }
+    }
+
+    /**
+     * Report of initial partial scan
+     * @param channelCount number of channels used in this scan
+     * @param status true if scan resulted in a network connection attempt, false otherwise
+     */
+    public void reportInitialPartialScan(int channelCount, boolean status) {
+        synchronized (mLock) {
+            if (status) {
+                mInitPartialScanSuccessCount++;
+                mInitPartialScanSuccessHistogram.increment(channelCount);
+            } else {
+                mInitPartialScanFailureCount++;
+                mInitPartialScanFailureHistogram.increment(channelCount);
+            }
+        }
+    }
+
+    /**
      * Put all metrics that were being tracked separately into mWifiLogProto
      */
     private void consolidateProto() {
@@ -4102,6 +4150,16 @@ public class WifiMetrics {
                     mRxThroughputMbpsHistogram2G.toProto();
             mWifiLogProto.throughputMbpsHistogram.rxAbove2G =
                     mRxThroughputMbpsHistogramAbove2G.toProto();
+
+            InitPartialScanStats initialPartialScanStats = new InitPartialScanStats();
+            initialPartialScanStats.numScans = mInitPartialScanTotalCount;
+            initialPartialScanStats.numSuccessScans = mInitPartialScanSuccessCount;
+            initialPartialScanStats.numFailureScans = mInitPartialScanFailureCount;
+            initialPartialScanStats.successfulScanChannelCountHistogram =
+                    mInitPartialScanSuccessHistogram.toProto();
+            initialPartialScanStats.failedScanChannelCountHistogram =
+                    mInitPartialScanFailureHistogram.toProto();
+            mWifiLogProto.initPartialScanStats = initialPartialScanStats;
         }
     }
 
@@ -4307,7 +4365,12 @@ public class WifiMetrics {
             mWifiLogProto.isExternalWifiScorerOn = false;
             mWifiOffMetrics.clear();
             mSoftApConfigLimitationMetrics.clear();
-
+            //Initial partial scan metrics
+            mInitPartialScanTotalCount = 0;
+            mInitPartialScanSuccessCount = 0;
+            mInitPartialScanFailureCount = 0;
+            mInitPartialScanSuccessHistogram.clear();
+            mInitPartialScanFailureHistogram.clear();
         }
     }
 
diff --git a/service/proto/src/metrics.proto b/service/proto/src/metrics.proto
index e0061f44d..04682db21 100644
--- a/service/proto/src/metrics.proto
+++ b/service/proto/src/metrics.proto
@@ -655,6 +655,9 @@ message WifiLog {
 
   // Total number of scan results from 6GHz band
   optional int32 num_6g_network_scan_results = 183;
+
+  // Initial partial scan stats
+  optional InitPartialScanStats init_partial_scan_stats = 184;
 }
 
 // Information that gets logged for every WiFi connection.
@@ -3122,3 +3125,22 @@ message ThroughputMbpsHistogram {
   // Rx histogram above 2G
   repeated HistogramBucketInt32 rx_above_2g = 4;
 }
+
+// Initial Partial Scan stats
+message InitPartialScanStats {
+  // Total number of partial scans
+  optional int32 num_scans = 1;
+
+  // Number of instances a partial scan results in finding a network
+  optional int32 num_success_scans = 2;
+
+  // Number of instances a patial scan does not result in finding a network
+  // and a follow up full scan finds a network.
+  optional int32 num_failure_scans = 3;
+
+  // Histogram of number of channels used in a successful partial scan
+  repeated HistogramBucketInt32 successful_scan_channel_count_histogram = 4;
+
+  // Histogram of number of channels used in a failed partial scan
+  repeated HistogramBucketInt32 failed_scan_channel_count_histogram = 5;
+}