Merge "implement Thread Border Router e2e integration test" into main
diff --git a/framework-t/src/android/net/NetworkStatsCollection.java b/framework-t/src/android/net/NetworkStatsCollection.java
index cb8328b..934b4c6 100644
--- a/framework-t/src/android/net/NetworkStatsCollection.java
+++ b/framework-t/src/android/net/NetworkStatsCollection.java
@@ -985,8 +985,8 @@
      * @hide
      */
     @Nullable
-    public static String compareStats(
-            NetworkStatsCollection migrated, NetworkStatsCollection legacy) {
+    public static String compareStats(NetworkStatsCollection migrated,
+                                      NetworkStatsCollection legacy, boolean allowKeyChange) {
         final Map<NetworkStatsCollection.Key, NetworkStatsHistory> migEntries =
                 migrated.getEntries();
         final Map<NetworkStatsCollection.Key, NetworkStatsHistory> legEntries = legacy.getEntries();
@@ -998,7 +998,7 @@
             final NetworkStatsHistory legHistory = legEntries.get(legKey);
             final NetworkStatsHistory migHistory = migEntries.get(legKey);
 
-            if (migHistory == null && couldKeyChangeOnImport(legKey)) {
+            if (migHistory == null && allowKeyChange && couldKeyChangeOnImport(legKey)) {
                 unmatchedLegKeys.remove(legKey);
                 continue;
             }
diff --git a/service-t/src/com/android/metrics/NetworkStatsMetricsLogger.java b/service-t/src/com/android/metrics/NetworkStatsMetricsLogger.java
new file mode 100644
index 0000000..3ed21a2
--- /dev/null
+++ b/service-t/src/com/android/metrics/NetworkStatsMetricsLogger.java
@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.metrics;
+
+import static android.net.netstats.NetworkStatsDataMigrationUtils.PREFIX_UID;
+import static android.net.netstats.NetworkStatsDataMigrationUtils.PREFIX_UID_TAG;
+import static android.net.netstats.NetworkStatsDataMigrationUtils.PREFIX_XT;
+
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__FAST_DATA_INPUT_STATE__FDIS_DISABLED;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__FAST_DATA_INPUT_STATE__FDIS_ENABLED;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__OPERATION_TYPE__ROT_READ;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UID;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UIDTAG;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UNKNOWN;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_XT;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.net.NetworkStatsCollection;
+import android.net.NetworkStatsHistory;
+import android.util.Pair;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.server.ConnectivityStatsLog;
+
+import java.io.File;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+/**
+ * Helper class to log NetworkStats related metrics.
+ *
+ * This class does not provide thread-safe.
+ */
+public class NetworkStatsMetricsLogger {
+    final Dependencies mDeps;
+    int mReadIndex = 1;
+
+    /** Dependency class */
+    @VisibleForTesting
+    public static class Dependencies {
+        /**
+         * Writes a NETWORK_STATS_RECORDER_FILE_OPERATION_REPORTED event to ConnectivityStatsLog.
+         */
+        public void writeRecorderFileReadingStats(int recorderType, int readIndex,
+                                                  int readLatencyMillis,
+                                                  int fileCount, int totalFileSize,
+                                                  int keys, int uids, int totalHistorySize,
+                                                  boolean useFastDataInput) {
+            ConnectivityStatsLog.write(NETWORK_STATS_RECORDER_FILE_OPERATED,
+                    NETWORK_STATS_RECORDER_FILE_OPERATED__OPERATION_TYPE__ROT_READ,
+                    recorderType,
+                    readIndex,
+                    readLatencyMillis,
+                    fileCount,
+                    totalFileSize,
+                    keys,
+                    uids,
+                    totalHistorySize,
+                    useFastDataInput
+                            ? NETWORK_STATS_RECORDER_FILE_OPERATED__FAST_DATA_INPUT_STATE__FDIS_ENABLED
+                            : NETWORK_STATS_RECORDER_FILE_OPERATED__FAST_DATA_INPUT_STATE__FDIS_DISABLED);
+        }
+    }
+
+    public NetworkStatsMetricsLogger() {
+        mDeps = new Dependencies();
+    }
+
+    @VisibleForTesting
+    public NetworkStatsMetricsLogger(Dependencies deps) {
+        mDeps = deps;
+    }
+
+    private static int prefixToRecorderType(@NonNull String prefix) {
+        switch (prefix) {
+            case PREFIX_XT:
+                return NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_XT;
+            case PREFIX_UID:
+                return NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UID;
+            case PREFIX_UID_TAG:
+                return NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UIDTAG;
+            default:
+                return NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UNKNOWN;
+        }
+    }
+
+    /**
+     * Get file count and total byte count for the given directory and prefix.
+     *
+     * @return File count and total byte count as a pair, or 0s if met errors.
+     */
+    private static Pair<Integer, Integer> getStatsFilesAttributes(
+            @Nullable File statsDir, @NonNull String prefix) {
+        if (statsDir == null) return new Pair<>(0, 0);
+
+        // Only counts the matching files.
+        // The files are named in the following format:
+        //   <prefix>.<startTimestamp>-[<endTimestamp>]
+        //   e.g. uid_tag.12345-
+        // See FileRotator#FileInfo for more detail.
+        final Pattern pattern = Pattern.compile("^" + prefix + "\\.[0-9]+-[0-9]*$");
+
+        // Ensure that base path exists.
+        statsDir.mkdirs();
+
+        int totalFiles = 0;
+        int totalBytes = 0;
+        for (String name : emptyIfNull(statsDir.list())) {
+            if (!pattern.matcher(name).matches()) continue;
+
+            totalFiles++;
+            // Cast to int is safe since stats persistent files are several MBs in total.
+            totalBytes += (int) (new File(statsDir, name).length());
+
+        }
+        return new Pair<>(totalFiles, totalBytes);
+    }
+
+    private static String [] emptyIfNull(@Nullable String [] array) {
+        return (array == null) ? new String[0] : array;
+    }
+
+    /**
+     * Log statistics from the NetworkStatsRecorder file reading process into statsd.
+     */
+    public void logRecorderFileReading(@NonNull String prefix, int readLatencyMillis,
+            @Nullable File statsDir, @NonNull NetworkStatsCollection collection,
+            boolean useFastDataInput) {
+        final Set<Integer> uids = new HashSet<>();
+        final Map<NetworkStatsCollection.Key, NetworkStatsHistory> entries =
+                collection.getEntries();
+
+        for (final NetworkStatsCollection.Key key : entries.keySet()) {
+            uids.add(key.uid);
+        }
+
+        int totalHistorySize = 0;
+        for (final NetworkStatsHistory history : entries.values()) {
+            totalHistorySize += history.size();
+        }
+
+        final Pair<Integer, Integer> fileAttributes = getStatsFilesAttributes(statsDir, prefix);
+        mDeps.writeRecorderFileReadingStats(prefixToRecorderType(prefix),
+                mReadIndex++,
+                readLatencyMillis,
+                fileAttributes.first /* fileCount */,
+                fileAttributes.second /* totalFileSize */,
+                entries.size(),
+                uids.size(),
+                totalHistorySize,
+                useFastDataInput);
+    }
+}
diff --git a/service-t/src/com/android/server/net/NetworkStatsRecorder.java b/service-t/src/com/android/server/net/NetworkStatsRecorder.java
index 5f9b65c..8ee8591 100644
--- a/service-t/src/com/android/server/net/NetworkStatsRecorder.java
+++ b/service-t/src/com/android/server/net/NetworkStatsRecorder.java
@@ -22,6 +22,7 @@
 import static android.text.format.DateUtils.YEAR_IN_MILLIS;
 
 import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.net.NetworkIdentitySet;
 import android.net.NetworkStats;
 import android.net.NetworkStats.NonMonotonicObserver;
@@ -32,17 +33,20 @@
 import android.net.TrafficStats;
 import android.os.Binder;
 import android.os.DropBoxManager;
+import android.os.SystemClock;
 import android.service.NetworkStatsRecorderProto;
 import android.util.IndentingPrintWriter;
 import android.util.Log;
 import android.util.proto.ProtoOutputStream;
 
 import com.android.internal.util.FileRotator;
+import com.android.metrics.NetworkStatsMetricsLogger;
 import com.android.net.module.util.NetworkStatsUtils;
 
 import libcore.io.IoUtils;
 
 import java.io.ByteArrayOutputStream;
+import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -90,6 +94,9 @@
     private final CombiningRewriter mPendingRewriter;
 
     private WeakReference<NetworkStatsCollection> mComplete;
+    private final NetworkStatsMetricsLogger mMetricsLogger = new NetworkStatsMetricsLogger();
+    @Nullable
+    private final File mStatsDir;
 
     /**
      * Non-persisted recorder, with only one bucket. Used by {@link NetworkStatsObservers}.
@@ -111,6 +118,7 @@
         mSinceBoot = new NetworkStatsCollection(mBucketDuration);
 
         mPendingRewriter = null;
+        mStatsDir = null;
     }
 
     /**
@@ -118,7 +126,7 @@
      */
     public NetworkStatsRecorder(FileRotator rotator, NonMonotonicObserver<String> observer,
             DropBoxManager dropBox, String cookie, long bucketDuration, boolean onlyTags,
-            boolean wipeOnError, boolean useFastDataInput) {
+            boolean wipeOnError, boolean useFastDataInput, @Nullable File statsDir) {
         mRotator = Objects.requireNonNull(rotator, "missing FileRotator");
         mObserver = Objects.requireNonNull(observer, "missing NonMonotonicObserver");
         mDropBox = Objects.requireNonNull(dropBox, "missing DropBoxManager");
@@ -133,6 +141,7 @@
         mSinceBoot = new NetworkStatsCollection(bucketDuration);
 
         mPendingRewriter = new CombiningRewriter(mPending);
+        mStatsDir = statsDir;
     }
 
     public void setPersistThreshold(long thresholdBytes) {
@@ -182,8 +191,16 @@
         Objects.requireNonNull(mRotator, "missing FileRotator");
         NetworkStatsCollection res = mComplete != null ? mComplete.get() : null;
         if (res == null) {
+            final long readStart = SystemClock.elapsedRealtime();
             res = loadLocked(Long.MIN_VALUE, Long.MAX_VALUE);
             mComplete = new WeakReference<NetworkStatsCollection>(res);
+            final long readEnd = SystemClock.elapsedRealtime();
+            // For legacy recorders which are used for data integrity check, which
+            // have wipeOnError flag unset, skip reporting metrics.
+            if (mWipeOnError) {
+                mMetricsLogger.logRecorderFileReading(mCookie, (int) (readEnd - readStart),
+                        mStatsDir, res, mUseFastDataInput);
+            }
         }
         return res;
     }
diff --git a/service-t/src/com/android/server/net/NetworkStatsService.java b/service-t/src/com/android/server/net/NetworkStatsService.java
index ad83e7f..3ac5e29 100644
--- a/service-t/src/com/android/server/net/NetworkStatsService.java
+++ b/service-t/src/com/android/server/net/NetworkStatsService.java
@@ -44,7 +44,6 @@
 import static android.net.NetworkStats.TAG_ALL;
 import static android.net.NetworkStats.TAG_NONE;
 import static android.net.NetworkStats.UID_ALL;
-import static android.net.NetworkStatsCollection.compareStats;
 import static android.net.NetworkStatsHistory.FIELD_ALL;
 import static android.net.NetworkTemplate.MATCH_MOBILE;
 import static android.net.NetworkTemplate.MATCH_TEST;
@@ -295,6 +294,11 @@
     static final String CONFIG_ENABLE_NETWORK_STATS_EVENT_LOGGER =
             "enable_network_stats_event_logger";
 
+    static final String NETSTATS_FASTDATAINPUT_TARGET_ATTEMPTS =
+            "netstats_fastdatainput_target_attempts";
+    static final String NETSTATS_FASTDATAINPUT_SUCCESSES_COUNTER_NAME = "fastdatainput.successes";
+    static final String NETSTATS_FASTDATAINPUT_FALLBACKS_COUNTER_NAME = "fastdatainput.fallbacks";
+
     private final Context mContext;
     private final NetworkStatsFactory mStatsFactory;
     private final AlarmManager mAlarmManager;
@@ -318,6 +322,8 @@
     private PersistentInt mImportLegacyAttemptsCounter = null;
     private PersistentInt mImportLegacySuccessesCounter = null;
     private PersistentInt mImportLegacyFallbacksCounter = null;
+    private PersistentInt mFastDataInputSuccessesCounter = null;
+    private PersistentInt mFastDataInputFallbacksCounter = null;
 
     @VisibleForTesting
     public static final String ACTION_NETWORK_STATS_POLL =
@@ -695,6 +701,24 @@
         }
 
         /**
+         * Get the count of using FastDataInput target attempts.
+         */
+        public int getUseFastDataInputTargetAttempts() {
+            return DeviceConfigUtils.getDeviceConfigPropertyInt(
+                    DeviceConfig.NAMESPACE_TETHERING,
+                    NETSTATS_FASTDATAINPUT_TARGET_ATTEMPTS, 0);
+        }
+
+        /**
+         * Compare two {@link NetworkStatsCollection} instances and returning a human-readable
+         * string description of difference for debugging purpose.
+         */
+        public String compareStats(@NonNull NetworkStatsCollection a,
+                                   @NonNull NetworkStatsCollection b, boolean allowKeyChange) {
+            return NetworkStatsCollection.compareStats(a, b, allowKeyChange);
+        }
+
+        /**
          * Create a persistent counter for given directory and name.
          */
         public PersistentInt createPersistentCounter(@NonNull Path dir, @NonNull String name)
@@ -892,13 +916,7 @@
         synchronized (mStatsLock) {
             mSystemReady = true;
 
-            // create data recorders along with historical rotators
-            mXtRecorder = buildRecorder(PREFIX_XT, mSettings.getXtConfig(), false, mStatsDir,
-                    true /* wipeOnError */);
-            mUidRecorder = buildRecorder(PREFIX_UID, mSettings.getUidConfig(), false, mStatsDir,
-                    true /* wipeOnError */);
-            mUidTagRecorder = buildRecorder(PREFIX_UID_TAG, mSettings.getUidTagConfig(), true,
-                    mStatsDir, true /* wipeOnError */);
+            makeRecordersLocked();
 
             updatePersistThresholdsLocked();
 
@@ -963,13 +981,106 @@
 
     private NetworkStatsRecorder buildRecorder(
             String prefix, NetworkStatsSettings.Config config, boolean includeTags,
-            File baseDir, boolean wipeOnError) {
+            File baseDir, boolean wipeOnError, boolean useFastDataInput) {
         final DropBoxManager dropBox = (DropBoxManager) mContext.getSystemService(
                 Context.DROPBOX_SERVICE);
         return new NetworkStatsRecorder(new FileRotator(
                 baseDir, prefix, config.rotateAgeMillis, config.deleteAgeMillis),
                 mNonMonotonicObserver, dropBox, prefix, config.bucketDuration, includeTags,
-                wipeOnError, false /* useFastDataInput */);
+                wipeOnError, useFastDataInput, baseDir);
+    }
+
+    @GuardedBy("mStatsLock")
+    private void makeRecordersLocked() {
+        boolean useFastDataInput = true;
+        try {
+            mFastDataInputSuccessesCounter = mDeps.createPersistentCounter(mStatsDir.toPath(),
+                    NETSTATS_FASTDATAINPUT_SUCCESSES_COUNTER_NAME);
+            mFastDataInputFallbacksCounter = mDeps.createPersistentCounter(mStatsDir.toPath(),
+                    NETSTATS_FASTDATAINPUT_FALLBACKS_COUNTER_NAME);
+        } catch (IOException e) {
+            Log.wtf(TAG, "Failed to create persistent counters, skip.", e);
+            useFastDataInput = false;
+        }
+
+        final int targetAttempts = mDeps.getUseFastDataInputTargetAttempts();
+        int successes = 0;
+        int fallbacks = 0;
+        try {
+            successes = mFastDataInputSuccessesCounter.get();
+            // Fallbacks counter would be set to non-zero value to indicate the reading was
+            // not successful.
+            fallbacks = mFastDataInputFallbacksCounter.get();
+        } catch (IOException e) {
+            Log.wtf(TAG, "Failed to read counters, skip.", e);
+            useFastDataInput = false;
+        }
+
+        final boolean doComparison;
+        if (useFastDataInput) {
+            // Use FastDataInput if it needs to be evaluated or at least one success.
+            doComparison = targetAttempts > successes + fallbacks;
+            // Set target attempt to -1 as the kill switch to disable the feature.
+            useFastDataInput = targetAttempts >= 0 && (doComparison || successes > 0);
+        } else {
+            // useFastDataInput is false due to previous failures.
+            doComparison = false;
+        }
+
+        // create data recorders along with historical rotators.
+        // Don't wipe on error if comparison is needed.
+        mXtRecorder = buildRecorder(PREFIX_XT, mSettings.getXtConfig(), false, mStatsDir,
+                !doComparison /* wipeOnError */, useFastDataInput);
+        mUidRecorder = buildRecorder(PREFIX_UID, mSettings.getUidConfig(), false, mStatsDir,
+                !doComparison /* wipeOnError */, useFastDataInput);
+        mUidTagRecorder = buildRecorder(PREFIX_UID_TAG, mSettings.getUidTagConfig(), true,
+                mStatsDir, !doComparison /* wipeOnError */, useFastDataInput);
+
+        if (!doComparison) return;
+
+        final MigrationInfo[] migrations = new MigrationInfo[]{
+                new MigrationInfo(mXtRecorder),
+                new MigrationInfo(mUidRecorder),
+                new MigrationInfo(mUidTagRecorder)
+        };
+        // Set wipeOnError flag false so the recorder won't damage persistent data if reads
+        // failed and calling deleteAll.
+        final NetworkStatsRecorder[] legacyRecorders = new NetworkStatsRecorder[]{
+                buildRecorder(PREFIX_XT, mSettings.getXtConfig(), false, mStatsDir,
+                        false /* wipeOnError */, false /* useFastDataInput */),
+                buildRecorder(PREFIX_UID, mSettings.getUidConfig(), false, mStatsDir,
+                        false /* wipeOnError */, false /* useFastDataInput */),
+                buildRecorder(PREFIX_UID_TAG, mSettings.getUidTagConfig(), true, mStatsDir,
+                        false /* wipeOnError */, false /* useFastDataInput */)};
+        boolean success = true;
+        for (int i = 0; i < migrations.length; i++) {
+            try {
+                migrations[i].collection = migrations[i].recorder.getOrLoadCompleteLocked();
+            } catch (Throwable t) {
+                Log.wtf(TAG, "Failed to load collection, skip.", t);
+                success = false;
+                break;
+            }
+            if (!compareImportedToLegacyStats(migrations[i], legacyRecorders[i],
+                    false /* allowKeyChange */)) {
+                success = false;
+                break;
+            }
+        }
+
+        try {
+            if (success) {
+                mFastDataInputSuccessesCounter.set(successes + 1);
+            } else {
+                // Fallback.
+                mXtRecorder = legacyRecorders[0];
+                mUidRecorder = legacyRecorders[1];
+                mUidTagRecorder = legacyRecorders[2];
+                mFastDataInputFallbacksCounter.set(fallbacks + 1);
+            }
+        } catch (IOException e) {
+            Log.wtf(TAG, "Failed to update counters. success = " + success, e);
+        }
     }
 
     @GuardedBy("mStatsLock")
@@ -1068,7 +1179,7 @@
                 new NetworkStatsSettings.Config(HOUR_IN_MILLIS,
                 15 * DAY_IN_MILLIS, 90 * DAY_IN_MILLIS);
         final NetworkStatsRecorder devRecorder = buildRecorder(PREFIX_DEV, devConfig,
-                false, mStatsDir, true /* wipeOnError */);
+                false, mStatsDir, true /* wipeOnError */, false /* useFastDataInput */);
         final MigrationInfo[] migrations = new MigrationInfo[]{
                 new MigrationInfo(devRecorder), new MigrationInfo(mXtRecorder),
                 new MigrationInfo(mUidRecorder), new MigrationInfo(mUidTagRecorder)
@@ -1085,11 +1196,11 @@
             legacyRecorders = new NetworkStatsRecorder[]{
                 null /* dev Recorder */,
                 buildRecorder(PREFIX_XT, mSettings.getXtConfig(), false, legacyBaseDir,
-                        false /* wipeOnError */),
+                        false /* wipeOnError */, false /* useFastDataInput */),
                 buildRecorder(PREFIX_UID, mSettings.getUidConfig(), false, legacyBaseDir,
-                        false /* wipeOnError */),
+                        false /* wipeOnError */, false /* useFastDataInput */),
                 buildRecorder(PREFIX_UID_TAG, mSettings.getUidTagConfig(), true, legacyBaseDir,
-                        false /* wipeOnError */)};
+                        false /* wipeOnError */, false /* useFastDataInput */)};
         } else {
             legacyRecorders = null;
         }
@@ -1120,7 +1231,8 @@
 
                 if (runComparison) {
                     final boolean success =
-                            compareImportedToLegacyStats(migration, legacyRecorders[i]);
+                            compareImportedToLegacyStats(migration, legacyRecorders[i],
+                                    true /* allowKeyChange */);
                     if (!success && !dryRunImportOnly) {
                         tryIncrementLegacyFallbacksCounter();
                     }
@@ -1243,7 +1355,7 @@
      * does not match or throw with exceptions.
      */
     private boolean compareImportedToLegacyStats(@NonNull MigrationInfo migration,
-            @Nullable NetworkStatsRecorder legacyRecorder) {
+            @Nullable NetworkStatsRecorder legacyRecorder, boolean allowKeyChange) {
         final NetworkStatsCollection legacyStats;
         // Skip the recorder that doesn't need to be compared.
         if (legacyRecorder == null) return true;
@@ -1258,7 +1370,8 @@
 
         // The result of comparison is only for logging.
         try {
-            final String error = compareStats(migration.collection, legacyStats);
+            final String error = mDeps.compareStats(migration.collection, legacyStats,
+                    allowKeyChange);
             if (error != null) {
                 Log.wtf(TAG, "Unexpected comparison result for recorder "
                         + legacyRecorder.getCookie() + ": " + error);
@@ -2639,6 +2752,17 @@
                 }
             }
             pw.println(CONFIG_ENABLE_NETWORK_STATS_EVENT_LOGGER + ": " + mSupportEventLogger);
+            pw.print(NETSTATS_FASTDATAINPUT_TARGET_ATTEMPTS,
+                    mDeps.getUseFastDataInputTargetAttempts());
+            pw.println();
+            try {
+                pw.print("FastDataInput successes", mFastDataInputSuccessesCounter.get());
+                pw.println();
+                pw.print("FastDataInput fallbacks", mFastDataInputFallbacksCounter.get());
+                pw.println();
+            } catch (IOException e) {
+                pw.println("(failed to dump FastDataInput counters)");
+            }
 
             pw.decreaseIndent();
 
diff --git a/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java b/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java
index 8036ae9..94ba9de 100644
--- a/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java
+++ b/service/src/com/android/server/connectivity/AutomaticOnOffKeepaliveTracker.java
@@ -25,9 +25,6 @@
 import static android.system.OsConstants.SOL_SOCKET;
 import static android.system.OsConstants.SO_SNDTIMEO;
 
-import static com.android.net.module.util.netlink.NetlinkConstants.NLMSG_DONE;
-import static com.android.net.module.util.netlink.NetlinkConstants.SOCKDIAG_MSG_HEADER_SIZE;
-import static com.android.net.module.util.netlink.NetlinkConstants.SOCK_DIAG_BY_FAMILY;
 import static com.android.net.module.util.netlink.NetlinkUtils.IO_TIMEOUT_MS;
 
 import android.annotation.IntDef;
@@ -90,6 +87,7 @@
  */
 public class AutomaticOnOffKeepaliveTracker {
     private static final String TAG = "AutomaticOnOffKeepaliveTracker";
+    private static final boolean DBG = Log.isLoggable(TAG, Log.DEBUG);
     private static final int[] ADDRESS_FAMILIES = new int[] {AF_INET6, AF_INET};
     private static final long LOW_TCP_POLLING_INTERVAL_MS = 1_000L;
     private static final int ADJUST_TCP_POLLING_DELAY_MS = 2000;
@@ -794,22 +792,18 @@
 
             try {
                 while (NetlinkUtils.enoughBytesRemainForValidNlMsg(bytes)) {
-                    final int startPos = bytes.position();
+                    // NetlinkMessage.parse() will move the byte buffer position.
+                    // TODO: Parse dst address information to filter socket.
+                    final NetlinkMessage nlMsg = NetlinkMessage.parse(
+                            bytes, OsConstants.NETLINK_INET_DIAG);
+                    if (!(nlMsg instanceof InetDiagMessage)) {
+                        if (DBG) Log.e(TAG, "Not a SOCK_DIAG_BY_FAMILY msg");
+                        return false;
+                    }
 
-                    final int nlmsgLen = bytes.getInt();
-                    final int nlmsgType = bytes.getShort();
-                    if (isEndOfMessageOrError(nlmsgType)) return false;
-                    // TODO: Parse InetDiagMessage to get uid and dst address information to filter
-                    //  socket via NetlinkMessage.parse.
-
-                    // Skip the header to move to data part.
-                    bytes.position(startPos + SOCKDIAG_MSG_HEADER_SIZE);
-
-                    if (isTargetTcpSocket(bytes, nlmsgLen, networkMark, networkMask)) {
-                        if (Log.isLoggable(TAG, Log.DEBUG)) {
-                            bytes.position(startPos);
-                            final InetDiagMessage diagMsg = (InetDiagMessage) NetlinkMessage.parse(
-                                    bytes, OsConstants.NETLINK_INET_DIAG);
+                    final InetDiagMessage diagMsg = (InetDiagMessage) nlMsg;
+                    if (isTargetTcpSocket(diagMsg, networkMark, networkMask, vpnUidRanges)) {
+                        if (DBG) {
                             Log.d(TAG, String.format("Found open TCP connection by uid %d to %s"
                                             + " cookie %d",
                                     diagMsg.inetDiagMsg.idiag_uid,
@@ -834,26 +828,31 @@
         return false;
     }
 
-    private boolean isEndOfMessageOrError(int nlmsgType) {
-        return nlmsgType == NLMSG_DONE || nlmsgType != SOCK_DIAG_BY_FAMILY;
+    private static boolean containsUid(Set<Range<Integer>> ranges, int uid) {
+        for (final Range<Integer> range: ranges) {
+            if (range.contains(uid)) {
+                return true;
+            }
+        }
+        return false;
     }
 
-    private boolean isTargetTcpSocket(@NonNull ByteBuffer bytes, int nlmsgLen, int networkMark,
-            int networkMask) {
-        final int mark = readSocketDataAndReturnMark(bytes, nlmsgLen);
+    private boolean isTargetTcpSocket(@NonNull InetDiagMessage diagMsg,
+            int networkMark, int networkMask, @NonNull Set<Range<Integer>> vpnUidRanges) {
+        if (!containsUid(vpnUidRanges, diagMsg.inetDiagMsg.idiag_uid)) return false;
+
+        final int mark = readSocketDataAndReturnMark(diagMsg);
         return (mark & networkMask) == networkMark;
     }
 
-    private int readSocketDataAndReturnMark(@NonNull ByteBuffer bytes, int nlmsgLen) {
-        final int nextMsgOffset = bytes.position() + nlmsgLen - SOCKDIAG_MSG_HEADER_SIZE;
+    private int readSocketDataAndReturnMark(@NonNull InetDiagMessage diagMsg) {
         int mark = NetlinkUtils.INIT_MARK_VALUE;
         // Get socket mark
-        // TODO: Add a parsing method in NetlinkMessage.parse to support this to skip the remaining
-        //  data.
-        while (bytes.position() < nextMsgOffset) {
-            final StructNlAttr nlattr = StructNlAttr.parse(bytes);
-            if (nlattr != null && nlattr.nla_type == NetlinkUtils.INET_DIAG_MARK) {
-                mark = nlattr.getValueAsInteger();
+        for (StructNlAttr attr : diagMsg.nlAttrs) {
+            if (attr.nla_type == NetlinkUtils.INET_DIAG_MARK) {
+                // The netlink attributes should contain only one INET_DIAG_MARK for each socket.
+                mark = attr.getValueAsInteger();
+                break;
             }
         }
         return mark;
diff --git a/staticlibs/netd/Android.bp b/staticlibs/netd/Android.bp
index 637a938..2b7e620 100644
--- a/staticlibs/netd/Android.bp
+++ b/staticlibs/netd/Android.bp
@@ -241,5 +241,17 @@
             min_sdk_version: "30",
         },
     },
-    versions: ["1"],
+    versions_with_info: [
+        {
+            version: "1",
+            imports: [],
+        },
+        {
+            version: "2",
+            imports: [],
+        },
+
+    ],
+    frozen: true,
+
 }
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/2/.hash b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/.hash
new file mode 100644
index 0000000..785d42d
--- /dev/null
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/.hash
@@ -0,0 +1 @@
+0e5d9ad0664b8b3ec9d323534c42333cf6f6ed3d
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/DiscoveryInfo.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/DiscoveryInfo.aidl
new file mode 100644
index 0000000..d31a327
--- /dev/null
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/DiscoveryInfo.aidl
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.net.mdns.aidl;
+/* @hide */
+@JavaDerive(equals=true, toString=true) @JavaOnlyImmutable
+parcelable DiscoveryInfo {
+  int id;
+  int result;
+  @utf8InCpp String serviceName;
+  @utf8InCpp String registrationType;
+  @utf8InCpp String domainName;
+  int interfaceIdx;
+  int netId;
+}
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/GetAddressInfo.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/GetAddressInfo.aidl
new file mode 100644
index 0000000..2049274
--- /dev/null
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/GetAddressInfo.aidl
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.net.mdns.aidl;
+/* @hide */
+@JavaDerive(equals=true, toString=true) @JavaOnlyImmutable
+parcelable GetAddressInfo {
+  int id;
+  int result;
+  @utf8InCpp String hostname;
+  @utf8InCpp String address;
+  int interfaceIdx;
+  int netId;
+}
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/IMDns.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/IMDns.aidl
new file mode 100644
index 0000000..d84742b
--- /dev/null
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/IMDns.aidl
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.net.mdns.aidl;
+/* @hide */
+interface IMDns {
+  /**
+   * @deprecated unimplemented on V+.
+   */
+  void startDaemon();
+  /**
+   * @deprecated unimplemented on V+.
+   */
+  void stopDaemon();
+  /**
+   * @deprecated unimplemented on U+.
+   */
+  void registerService(in android.net.mdns.aidl.RegistrationInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
+  void discover(in android.net.mdns.aidl.DiscoveryInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
+  void resolve(in android.net.mdns.aidl.ResolutionInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
+  void getServiceAddress(in android.net.mdns.aidl.GetAddressInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
+  void stopOperation(int id);
+  /**
+   * @deprecated unimplemented on U+.
+   */
+  void registerEventListener(in android.net.mdns.aidl.IMDnsEventListener listener);
+  /**
+   * @deprecated unimplemented on U+.
+   */
+  void unregisterEventListener(in android.net.mdns.aidl.IMDnsEventListener listener);
+}
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/IMDnsEventListener.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/IMDnsEventListener.aidl
new file mode 100644
index 0000000..187a3d2
--- /dev/null
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/IMDnsEventListener.aidl
@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2022, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.net.mdns.aidl;
+/* @hide */
+interface IMDnsEventListener {
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
+  oneway void onServiceRegistrationStatus(in android.net.mdns.aidl.RegistrationInfo status);
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
+  oneway void onServiceDiscoveryStatus(in android.net.mdns.aidl.DiscoveryInfo status);
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
+  oneway void onServiceResolutionStatus(in android.net.mdns.aidl.ResolutionInfo status);
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
+  oneway void onGettingServiceAddressStatus(in android.net.mdns.aidl.GetAddressInfo status);
+  const int SERVICE_DISCOVERY_FAILED = 602;
+  const int SERVICE_FOUND = 603;
+  const int SERVICE_LOST = 604;
+  const int SERVICE_REGISTRATION_FAILED = 605;
+  const int SERVICE_REGISTERED = 606;
+  const int SERVICE_RESOLUTION_FAILED = 607;
+  const int SERVICE_RESOLVED = 608;
+  const int SERVICE_GET_ADDR_FAILED = 611;
+  const int SERVICE_GET_ADDR_SUCCESS = 612;
+}
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/RegistrationInfo.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/RegistrationInfo.aidl
new file mode 100644
index 0000000..185111b
--- /dev/null
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/RegistrationInfo.aidl
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.net.mdns.aidl;
+/* @hide */
+@JavaDerive(equals=true, toString=true) @JavaOnlyImmutable
+parcelable RegistrationInfo {
+  int id;
+  int result;
+  @utf8InCpp String serviceName;
+  @utf8InCpp String registrationType;
+  int port;
+  byte[] txtRecord;
+  int interfaceIdx;
+}
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/ResolutionInfo.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/ResolutionInfo.aidl
new file mode 100644
index 0000000..4aa7d79
--- /dev/null
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/2/android/net/mdns/aidl/ResolutionInfo.aidl
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.net.mdns.aidl;
+/* @hide */
+@JavaDerive(equals=true, toString=true) @JavaOnlyImmutable
+parcelable ResolutionInfo {
+  int id;
+  int result;
+  @utf8InCpp String serviceName;
+  @utf8InCpp String registrationType;
+  @utf8InCpp String domain;
+  @utf8InCpp String serviceFullName;
+  @utf8InCpp String hostname;
+  int port;
+  byte[] txtRecord;
+  int interfaceIdx;
+}
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDns.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDns.aidl
index ecbe966..d84742b 100644
--- a/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDns.aidl
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDns.aidl
@@ -34,13 +34,40 @@
 package android.net.mdns.aidl;
 /* @hide */
 interface IMDns {
+  /**
+   * @deprecated unimplemented on V+.
+   */
   void startDaemon();
+  /**
+   * @deprecated unimplemented on V+.
+   */
   void stopDaemon();
+  /**
+   * @deprecated unimplemented on U+.
+   */
   void registerService(in android.net.mdns.aidl.RegistrationInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
   void discover(in android.net.mdns.aidl.DiscoveryInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
   void resolve(in android.net.mdns.aidl.ResolutionInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
   void getServiceAddress(in android.net.mdns.aidl.GetAddressInfo info);
+  /**
+   * @deprecated unimplemented on U+.
+   */
   void stopOperation(int id);
+  /**
+   * @deprecated unimplemented on U+.
+   */
   void registerEventListener(in android.net.mdns.aidl.IMDnsEventListener listener);
+  /**
+   * @deprecated unimplemented on U+.
+   */
   void unregisterEventListener(in android.net.mdns.aidl.IMDnsEventListener listener);
 }
diff --git a/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDnsEventListener.aidl b/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDnsEventListener.aidl
index 4625cac..187a3d2 100644
--- a/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDnsEventListener.aidl
+++ b/staticlibs/netd/aidl_api/mdns_aidl_interface/current/android/net/mdns/aidl/IMDnsEventListener.aidl
@@ -34,9 +34,21 @@
 package android.net.mdns.aidl;
 /* @hide */
 interface IMDnsEventListener {
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
   oneway void onServiceRegistrationStatus(in android.net.mdns.aidl.RegistrationInfo status);
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
   oneway void onServiceDiscoveryStatus(in android.net.mdns.aidl.DiscoveryInfo status);
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
   oneway void onServiceResolutionStatus(in android.net.mdns.aidl.ResolutionInfo status);
+  /**
+   * @deprecated this is implemented for backward compatibility. Don't use it in new code.
+   */
   oneway void onGettingServiceAddressStatus(in android.net.mdns.aidl.GetAddressInfo status);
   const int SERVICE_DISCOVERY_FAILED = 602;
   const int SERVICE_FOUND = 603;
diff --git a/staticlibs/netd/binder/android/net/mdns/aidl/IMDns.aidl b/staticlibs/netd/binder/android/net/mdns/aidl/IMDns.aidl
index 255d70f..3bf1da8 100644
--- a/staticlibs/netd/binder/android/net/mdns/aidl/IMDns.aidl
+++ b/staticlibs/netd/binder/android/net/mdns/aidl/IMDns.aidl
@@ -28,6 +28,8 @@
      * Start the MDNSResponder daemon.
      *
      * @throws ServiceSpecificException with unix errno EALREADY if daemon is already running.
+     * @throws UnsupportedOperationException on Android V and after.
+     * @deprecated unimplemented on V+.
      */
     void startDaemon();
 
@@ -35,6 +37,8 @@
      * Stop the MDNSResponder daemon.
      *
      * @throws ServiceSpecificException with unix errno EBUSY if daemon is still in use.
+     * @throws UnsupportedOperationException on Android V and after.
+     * @deprecated unimplemented on V+.
      */
     void stopDaemon();
 
@@ -49,6 +53,8 @@
      * @throws ServiceSpecificException with one of the following error values:
      *         - Unix errno EBUSY if request id is already in use.
      *         - kDNSServiceErr_* list in dns_sd.h if registration fail.
+     * @throws UnsupportedOperationException on Android U and after.
+     * @deprecated unimplemented on U+.
      */
     void registerService(in RegistrationInfo info);
 
@@ -63,6 +69,8 @@
      * @throws ServiceSpecificException with one of the following error values:
      *         - Unix errno EBUSY if request id is already in use.
      *         - kDNSServiceErr_* list in dns_sd.h if discovery fail.
+     * @throws UnsupportedOperationException on Android U and after.
+     * @deprecated unimplemented on U+.
      */
     void discover(in DiscoveryInfo info);
 
@@ -77,6 +85,8 @@
      * @throws ServiceSpecificException with one of the following error values:
      *         - Unix errno EBUSY if request id is already in use.
      *         - kDNSServiceErr_* list in dns_sd.h if resolution fail.
+     * @throws UnsupportedOperationException on Android U and after.
+     * @deprecated unimplemented on U+.
      */
     void resolve(in ResolutionInfo info);
 
@@ -92,6 +102,8 @@
      * @throws ServiceSpecificException with one of the following error values:
      *         - Unix errno EBUSY if request id is already in use.
      *         - kDNSServiceErr_* list in dns_sd.h if getting address fail.
+     * @throws UnsupportedOperationException on Android U and after.
+     * @deprecated unimplemented on U+.
      */
     void getServiceAddress(in GetAddressInfo info);
 
@@ -101,6 +113,8 @@
      * @param id the operation id to be stopped.
      *
      * @throws ServiceSpecificException with unix errno ESRCH if request id is not in use.
+     * @throws UnsupportedOperationException on Android U and after.
+     * @deprecated unimplemented on U+.
      */
     void stopOperation(int id);
 
@@ -112,6 +126,8 @@
      * @throws ServiceSpecificException with one of the following error values:
      *         - Unix errno EINVAL if listener is null.
      *         - Unix errno EEXIST if register duplicated listener.
+     * @throws UnsupportedOperationException on Android U and after.
+     * @deprecated unimplemented on U+.
      */
     void registerEventListener(in IMDnsEventListener listener);
 
@@ -121,6 +137,8 @@
      * @param listener The listener to be unregistered.
      *
      * @throws ServiceSpecificException with unix errno EINVAL if listener is null.
+     * @throws UnsupportedOperationException on Android U and after.
+     * @deprecated unimplemented on U+.
      */
     void unregisterEventListener(in IMDnsEventListener listener);
 }
diff --git a/staticlibs/netd/binder/android/net/mdns/aidl/IMDnsEventListener.aidl b/staticlibs/netd/binder/android/net/mdns/aidl/IMDnsEventListener.aidl
index a202a26..f7f028b 100644
--- a/staticlibs/netd/binder/android/net/mdns/aidl/IMDnsEventListener.aidl
+++ b/staticlibs/netd/binder/android/net/mdns/aidl/IMDnsEventListener.aidl
@@ -31,8 +31,8 @@
 oneway interface IMDnsEventListener {
     /**
      * Types for MDNS operation result.
-     * These are in sync with frameworks/libs/net/common/netd/libnetdutils/include/netdutils/\
-     * ResponseCode.h
+     * These are in sync with packages/modules/Connectivity/staticlibs/netd/libnetdutils/include/\
+     * netdutils/ResponseCode.h
      */
     const int SERVICE_DISCOVERY_FAILED     = 602;
     const int SERVICE_FOUND                = 603;
@@ -46,21 +46,29 @@
 
     /**
      * Notify service registration status.
+     *
+     * @deprecated this is implemented for backward compatibility. Don't use it in new code.
      */
     void onServiceRegistrationStatus(in RegistrationInfo status);
 
     /**
      * Notify service discovery status.
+     *
+     * @deprecated this is implemented for backward compatibility. Don't use it in new code.
      */
     void onServiceDiscoveryStatus(in DiscoveryInfo status);
 
     /**
      * Notify service resolution status.
+     *
+     * @deprecated this is implemented for backward compatibility. Don't use it in new code.
      */
     void onServiceResolutionStatus(in ResolutionInfo status);
 
     /**
      * Notify getting service address status.
+     *
+     * @deprecated this is implemented for backward compatibility. Don't use it in new code.
      */
     void onGettingServiceAddressStatus(in GetAddressInfo status);
 }
diff --git a/tests/benchmark/src/android/net/netstats/benchmarktests/NetworkStatsTest.kt b/tests/benchmark/src/android/net/netstats/benchmarktests/NetworkStatsTest.kt
index c3ea9f4..57602f1 100644
--- a/tests/benchmark/src/android/net/netstats/benchmarktests/NetworkStatsTest.kt
+++ b/tests/benchmark/src/android/net/netstats/benchmarktests/NetworkStatsTest.kt
@@ -156,7 +156,8 @@
                 UID_COLLECTION_BUCKET_DURATION_MS,
                 false /* includeTags */,
                 false /* wipeOnError */,
-                useFastDataInput /* useFastDataInput */
+                useFastDataInput /* useFastDataInput */,
+                it
             )
             recorder.orLoadCompleteLocked
         }
diff --git a/tests/unit/java/android/net/NetworkStatsRecorderTest.java b/tests/unit/java/android/net/NetworkStatsRecorderTest.java
index e8f853e..7d039b6 100644
--- a/tests/unit/java/android/net/NetworkStatsRecorderTest.java
+++ b/tests/unit/java/android/net/NetworkStatsRecorderTest.java
@@ -16,8 +16,17 @@
 
 package com.android.server.net;
 
+import static android.net.NetworkStats.SET_DEFAULT;
+import static android.net.NetworkStats.SET_FOREGROUND;
+import static android.net.NetworkStats.TAG_NONE;
+import static android.net.netstats.NetworkStatsDataMigrationUtils.PREFIX_UID;
+import static android.net.netstats.NetworkStatsDataMigrationUtils.PREFIX_UID_TAG;
+import static android.net.netstats.NetworkStatsDataMigrationUtils.PREFIX_XT;
 import static android.text.format.DateUtils.HOUR_IN_MILLIS;
 
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UID;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UIDTAG;
+import static com.android.server.ConnectivityStatsLog.NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_XT;
 import static com.android.testutils.DevSdkIgnoreRuleKt.SC_V2;
 
 import static org.mockito.Mockito.any;
@@ -29,21 +38,31 @@
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
+import android.annotation.NonNull;
+import android.net.NetworkIdentity;
+import android.net.NetworkIdentitySet;
 import android.net.NetworkStats;
+import android.net.NetworkStatsCollection;
 import android.os.DropBoxManager;
 
 import androidx.test.filters.SmallTest;
 
 import com.android.internal.util.FileRotator;
+import com.android.metrics.NetworkStatsMetricsLogger;
 import com.android.testutils.DevSdkIgnoreRule;
 import com.android.testutils.DevSdkIgnoreRunner;
 
+import libcore.testing.io.TestIoUtils;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
 
 @RunWith(DevSdkIgnoreRunner.class)
@@ -53,6 +72,8 @@
     private static final String TAG = NetworkStatsRecorderTest.class.getSimpleName();
 
     private static final String TEST_PREFIX = "test";
+    private static final int TEST_UID1 = 1234;
+    private static final int TEST_UID2 = 1235;
 
     @Mock private DropBoxManager mDropBox;
     @Mock private NetworkStats.NonMonotonicObserver mObserver;
@@ -65,7 +86,7 @@
     private NetworkStatsRecorder buildRecorder(FileRotator rotator, boolean wipeOnError) {
         return new NetworkStatsRecorder(rotator, mObserver, mDropBox, TEST_PREFIX,
                 HOUR_IN_MILLIS, false /* includeTags */, wipeOnError,
-                false /* useFastDataInput */);
+                false /* useFastDataInput */, null /* baseDir */);
     }
 
     @Test
@@ -86,4 +107,110 @@
         // Verify that the rotator won't delete files.
         verify(rotator, never()).deleteAll();
     }
+
+    @Test
+    public void testFileReadingMetrics_empty() {
+        final NetworkStatsCollection collection = new NetworkStatsCollection(30);
+        final NetworkStatsMetricsLogger.Dependencies deps =
+                mock(NetworkStatsMetricsLogger.Dependencies.class);
+        final NetworkStatsMetricsLogger logger = new NetworkStatsMetricsLogger(deps);
+        logger.logRecorderFileReading(PREFIX_XT, 888, null /* statsDir */, collection,
+                false /* useFastDataInput */);
+        verify(deps).writeRecorderFileReadingStats(
+                NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_XT,
+                1 /* readIndex */,
+                888 /* readLatencyMillis */,
+                0 /* fileCount */,
+                0 /* totalFileSize */,
+                0 /* keys */,
+                0 /* uids */,
+                0 /* totalHistorySize */,
+                false /* useFastDataInput */
+        );
+
+        // Write second time, verify the index increases.
+        logger.logRecorderFileReading(PREFIX_XT, 567, null /* statsDir */, collection,
+                true /* useFastDataInput */);
+        verify(deps).writeRecorderFileReadingStats(
+                NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_XT,
+                2 /* readIndex */,
+                567 /* readLatencyMillis */,
+                0 /* fileCount */,
+                0 /* totalFileSize */,
+                0 /* keys */,
+                0 /* uids */,
+                0 /* totalHistorySize */,
+                true /* useFastDataInput */
+        );
+    }
+
+    @Test
+    public void testFileReadingMetrics() {
+        final NetworkStatsCollection collection = new NetworkStatsCollection(30);
+        final NetworkStats.Entry entry = new NetworkStats.Entry();
+        final NetworkIdentitySet identSet = new NetworkIdentitySet();
+        identSet.add(new NetworkIdentity.Builder().build());
+        // Empty entries will be skipped, put some ints to make sure they can be recorded.
+        entry.rxBytes = 1;
+
+        collection.recordData(identSet, TEST_UID1, SET_DEFAULT, TAG_NONE, 0, 60, entry);
+        collection.recordData(identSet, TEST_UID2, SET_DEFAULT, TAG_NONE, 0, 60, entry);
+        collection.recordData(identSet, TEST_UID2, SET_FOREGROUND, TAG_NONE, 30, 60, entry);
+
+        final NetworkStatsMetricsLogger.Dependencies deps =
+                mock(NetworkStatsMetricsLogger.Dependencies.class);
+        final NetworkStatsMetricsLogger logger = new NetworkStatsMetricsLogger(deps);
+        logger.logRecorderFileReading(PREFIX_UID, 123, null /* statsDir */, collection,
+                false /* useFastDataInput */);
+        verify(deps).writeRecorderFileReadingStats(
+                NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UID,
+                1 /* readIndex */,
+                123 /* readLatencyMillis */,
+                0 /* fileCount */,
+                0 /* totalFileSize */,
+                3 /* keys */,
+                2 /* uids */,
+                5 /* totalHistorySize */,
+                false /* useFastDataInput */
+        );
+    }
+
+    @Test
+    public void testFileReadingMetrics_fileAttributes() throws IOException {
+        final NetworkStatsCollection collection = new NetworkStatsCollection(30);
+
+        // Create files for testing. Only the first and the third files should be counted,
+        // with total 26 (each char takes 2 bytes) bytes in the content.
+        final File statsDir = TestIoUtils.createTemporaryDirectory(getClass().getSimpleName());
+        write(statsDir, "uid_tag.1024-2048", "wanted");
+        write(statsDir, "uid_tag.1024-2048.backup", "");
+        write(statsDir, "uid_tag.2048-", "wanted2");
+        write(statsDir, "uid.2048-4096", "unwanted");
+        write(statsDir, "uid.2048-4096.backup", "unwanted2");
+
+        final NetworkStatsMetricsLogger.Dependencies deps =
+                mock(NetworkStatsMetricsLogger.Dependencies.class);
+        final NetworkStatsMetricsLogger logger = new NetworkStatsMetricsLogger(deps);
+        logger.logRecorderFileReading(PREFIX_UID_TAG, 678, statsDir, collection,
+                false /* useFastDataInput */);
+        verify(deps).writeRecorderFileReadingStats(
+                NETWORK_STATS_RECORDER_FILE_OPERATED__RECORDER_PREFIX__PREFIX_UIDTAG,
+                1 /* readIndex */,
+                678 /* readLatencyMillis */,
+                2 /* fileCount */,
+                26 /* totalFileSize */,
+                0 /* keys */,
+                0 /* uids */,
+                0 /* totalHistorySize */,
+                false /* useFastDataInput */
+        );
+    }
+
+    private void write(@NonNull File baseDir, @NonNull String name,
+                       @NonNull String value) throws IOException {
+        final DataOutputStream out = new DataOutputStream(
+                new FileOutputStream(new File(baseDir, name)));
+        out.writeChars(value);
+        out.close();
+    }
 }
diff --git a/tests/unit/java/com/android/server/connectivity/AutomaticOnOffKeepaliveTrackerTest.java b/tests/unit/java/com/android/server/connectivity/AutomaticOnOffKeepaliveTrackerTest.java
index 015b75a..4fcf8a8 100644
--- a/tests/unit/java/com/android/server/connectivity/AutomaticOnOffKeepaliveTrackerTest.java
+++ b/tests/unit/java/com/android/server/connectivity/AutomaticOnOffKeepaliveTrackerTest.java
@@ -162,7 +162,7 @@
             + "00000000"            // idiag_expires
             + "00000000"            // idiag_rqueue
             + "00000000"            // idiag_wqueue
-            + "00000000"            // idiag_uid
+            + "39300000"            // idiag_uid = 12345
             + "00000000"            // idiag_inode
             // rtattr
             + "0500"            // len = 5
@@ -427,6 +427,16 @@
     }
 
     @Test
+    public void testIsAnyTcpSocketConnected_noTargetUidSocket() throws Exception {
+        setupResponseWithSocketExisting();
+        // Configured uid(12345) is not in the VPN range.
+        assertFalse(visibleOnHandlerThread(mTestHandler,
+                () -> mAOOKeepaliveTracker.isAnyTcpSocketConnected(
+                        TEST_NETID,
+                        new ArraySet<>(Arrays.asList(new Range<>(99999, 99999))))));
+    }
+
+    @Test
     public void testIsAnyTcpSocketConnected_withIncorrectNetId() throws Exception {
         setupResponseWithSocketExisting();
         assertFalse(visibleOnHandlerThread(mTestHandler,
diff --git a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
index 19216a7..1ee3f9d 100644
--- a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
+++ b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
@@ -67,6 +67,8 @@
 import static com.android.server.net.NetworkStatsEventLogger.POLL_REASON_RAT_CHANGED;
 import static com.android.server.net.NetworkStatsEventLogger.PollEvent.pollReasonNameOf;
 import static com.android.server.net.NetworkStatsService.ACTION_NETWORK_STATS_POLL;
+import static com.android.server.net.NetworkStatsService.NETSTATS_FASTDATAINPUT_FALLBACKS_COUNTER_NAME;
+import static com.android.server.net.NetworkStatsService.NETSTATS_FASTDATAINPUT_SUCCESSES_COUNTER_NAME;
 import static com.android.server.net.NetworkStatsService.NETSTATS_IMPORT_ATTEMPTS_COUNTER_NAME;
 import static com.android.server.net.NetworkStatsService.NETSTATS_IMPORT_FALLBACKS_COUNTER_NAME;
 import static com.android.server.net.NetworkStatsService.NETSTATS_IMPORT_SUCCESSES_COUNTER_NAME;
@@ -283,9 +285,14 @@
     private @Mock PersistentInt mImportLegacyAttemptsCounter;
     private @Mock PersistentInt mImportLegacySuccessesCounter;
     private @Mock PersistentInt mImportLegacyFallbacksCounter;
+    private int mFastDataInputTargetAttempts = 0;
+    private @Mock PersistentInt mFastDataInputSuccessesCounter;
+    private @Mock PersistentInt mFastDataInputFallbacksCounter;
+    private String mCompareStatsResult = null;
     private @Mock Resources mResources;
     private Boolean mIsDebuggable;
     private HandlerThread mObserverHandlerThread;
+    final TestDependencies mDeps = new TestDependencies();
 
     private class MockContext extends BroadcastInterceptingContext {
         private final Context mBaseContext;
@@ -368,7 +375,6 @@
                 powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
 
         mHandlerThread = new HandlerThread("NetworkStatsServiceTest-HandlerThread");
-        final NetworkStatsService.Dependencies deps = makeDependencies();
         // Create a separate thread for observers to run on. This thread cannot be the same
         // as the handler thread, because the observer callback is fired on this thread, and
         // it should not be blocked by client code. Additionally, creating the observers
@@ -383,7 +389,7 @@
             }
         };
         mService = new NetworkStatsService(mServiceContext, mNetd, mAlarmManager, wakeLock,
-                mClock, mSettings, mStatsFactory, statsObservers, deps);
+                mClock, mSettings, mStatsFactory, statsObservers, mDeps);
 
         mElapsedRealtime = 0L;
 
@@ -422,12 +428,9 @@
         mUsageCallback = new TestableUsageCallback(mUsageCallbackBinder);
     }
 
-    @NonNull
-    private TestDependencies makeDependencies() {
-        return new TestDependencies();
-    }
-
     class TestDependencies extends NetworkStatsService.Dependencies {
+        private int mCompareStatsInvocation = 0;
+
         @Override
         public File getLegacyStatsDir() {
             return mLegacyStatsDir;
@@ -449,6 +452,22 @@
         }
 
         @Override
+        public int getUseFastDataInputTargetAttempts() {
+            return mFastDataInputTargetAttempts;
+        }
+
+        @Override
+        public String compareStats(NetworkStatsCollection a, NetworkStatsCollection b,
+                 boolean allowKeyChange) {
+            mCompareStatsInvocation++;
+            return mCompareStatsResult;
+        }
+
+        int getCompareStatsInvocation() {
+            return mCompareStatsInvocation;
+        }
+
+        @Override
         public PersistentInt createPersistentCounter(@NonNull Path dir, @NonNull String name) {
             switch (name) {
                 case NETSTATS_IMPORT_ATTEMPTS_COUNTER_NAME:
@@ -457,6 +476,10 @@
                     return mImportLegacySuccessesCounter;
                 case NETSTATS_IMPORT_FALLBACKS_COUNTER_NAME:
                     return mImportLegacyFallbacksCounter;
+                case NETSTATS_FASTDATAINPUT_SUCCESSES_COUNTER_NAME:
+                    return mFastDataInputSuccessesCounter;
+                case NETSTATS_FASTDATAINPUT_FALLBACKS_COUNTER_NAME:
+                    return mFastDataInputFallbacksCounter;
                 default:
                     throw new IllegalArgumentException("Unknown counter name: " + name);
             }
@@ -2166,6 +2189,71 @@
     }
 
     @Test
+    public void testAdoptFastDataInput_featureDisabled() throws Exception {
+        // Boot through serviceReady() with flag disabled, verify the persistent
+        // counters are not increased.
+        mFastDataInputTargetAttempts = 0;
+        doReturn(0).when(mFastDataInputSuccessesCounter).get();
+        doReturn(0).when(mFastDataInputFallbacksCounter).get();
+        mService.systemReady();
+        verify(mFastDataInputSuccessesCounter, never()).set(anyInt());
+        verify(mFastDataInputFallbacksCounter, never()).set(anyInt());
+        assertEquals(0, mDeps.getCompareStatsInvocation());
+    }
+
+    @Test
+    public void testAdoptFastDataInput_noRetryAfterFail() throws Exception {
+        // Boot through serviceReady(), verify the service won't retry unexpectedly
+        // since the target attempt remains the same.
+        mFastDataInputTargetAttempts = 1;
+        doReturn(0).when(mFastDataInputSuccessesCounter).get();
+        doReturn(1).when(mFastDataInputFallbacksCounter).get();
+        mService.systemReady();
+        verify(mFastDataInputSuccessesCounter, never()).set(anyInt());
+        verify(mFastDataInputFallbacksCounter, never()).set(anyInt());
+    }
+
+    @Test
+    public void testAdoptFastDataInput_noRetryAfterSuccess() throws Exception {
+        // Boot through serviceReady(), verify the service won't retry unexpectedly
+        // since the target attempt remains the same.
+        mFastDataInputTargetAttempts = 1;
+        doReturn(1).when(mFastDataInputSuccessesCounter).get();
+        doReturn(0).when(mFastDataInputFallbacksCounter).get();
+        mService.systemReady();
+        verify(mFastDataInputSuccessesCounter, never()).set(anyInt());
+        verify(mFastDataInputFallbacksCounter, never()).set(anyInt());
+    }
+
+    @Test
+    public void testAdoptFastDataInput_hasDiff() throws Exception {
+        // Boot through serviceReady() with flag enabled and assumes the stats are
+        // failed to compare, verify the fallbacks counter is increased.
+        mockDefaultSettings();
+        doReturn(0).when(mFastDataInputSuccessesCounter).get();
+        doReturn(0).when(mFastDataInputFallbacksCounter).get();
+        mFastDataInputTargetAttempts = 1;
+        mCompareStatsResult = "Has differences";
+        mService.systemReady();
+        verify(mFastDataInputSuccessesCounter, never()).set(anyInt());
+        verify(mFastDataInputFallbacksCounter).set(1);
+    }
+
+    @Test
+    public void testAdoptFastDataInput_noDiff() throws Exception {
+        // Boot through serviceReady() with target attempts increased,
+        // assumes there was a previous failure,
+        // and assumes the stats are successfully compared,
+        // verify the successes counter is increased.
+        mFastDataInputTargetAttempts = 2;
+        doReturn(1).when(mFastDataInputFallbacksCounter).get();
+        mCompareStatsResult = null;
+        mService.systemReady();
+        verify(mFastDataInputSuccessesCounter).set(1);
+        verify(mFastDataInputFallbacksCounter, never()).set(anyInt());
+    }
+
+    @Test
     public void testStatsFactoryRemoveUids() throws Exception {
         // pretend that network comes online
         mockDefaultSettings();
@@ -2231,7 +2319,7 @@
         return new NetworkStatsRecorder(new FileRotator(
                 directory, prefix, config.rotateAgeMillis, config.deleteAgeMillis),
                 observer, dropBox, prefix, config.bucketDuration, includeTags, wipeOnError,
-                false /* useFastDataInput */);
+                false /* useFastDataInput */, directory);
     }
 
     private NetworkStatsCollection getLegacyCollection(String prefix, boolean includeTags) {