diff --git a/Tethering/jarjar-rules.txt b/Tethering/jarjar-rules.txt
index e90a2cc..8f072e4 100644
--- a/Tethering/jarjar-rules.txt
+++ b/Tethering/jarjar-rules.txt
@@ -15,3 +15,6 @@
 rule android.net.LocalLog* com.android.networkstack.tethering.LocalLog@1
 
 rule android.net.shared.Inet4AddressUtils* com.android.networkstack.tethering.shared.Inet4AddressUtils@1
+
+# Classes from net-utils-framework-common
+rule com.android.net.module.util.** com.android.networkstack.tethering.util.@1
\ No newline at end of file
diff --git a/Tethering/src/com/android/networkstack/tethering/BpfCoordinator.java b/Tethering/src/com/android/networkstack/tethering/BpfCoordinator.java
index fc27b6a..20f30ea 100644
--- a/Tethering/src/com/android/networkstack/tethering/BpfCoordinator.java
+++ b/Tethering/src/com/android/networkstack/tethering/BpfCoordinator.java
@@ -25,6 +25,8 @@
 import static android.net.NetworkStats.UID_TETHERING;
 import static android.net.netstats.provider.NetworkStatsProvider.QUOTA_UNLIMITED;
 
+import static com.android.networkstack.tethering.TetheringConfiguration.DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS;
+
 import android.app.usage.NetworkStatsManager;
 import android.net.INetd;
 import android.net.MacAddress;
@@ -36,6 +38,7 @@
 import android.net.netstats.provider.NetworkStatsProvider;
 import android.net.util.SharedLog;
 import android.net.util.TetheringUtils.ForwardedStats;
+import android.os.ConditionVariable;
 import android.os.Handler;
 import android.os.RemoteException;
 import android.os.ServiceSpecificException;
@@ -47,11 +50,13 @@
 import androidx.annotation.Nullable;
 
 import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.util.IndentingPrintWriter;
 
 import java.net.Inet6Address;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
+import java.util.Map;
 import java.util.Objects;
 
 /**
@@ -65,8 +70,7 @@
  */
 public class BpfCoordinator {
     private static final String TAG = BpfCoordinator.class.getSimpleName();
-    @VisibleForTesting
-    static final int DEFAULT_PERFORM_POLL_INTERVAL_MS = 5000; // TODO: Make it customizable.
+    private static final int DUMP_TIMEOUT_MS = 10_000;
 
     @VisibleForTesting
     enum StatsType {
@@ -85,6 +89,13 @@
     @Nullable
     private final BpfTetherStatsProvider mStatsProvider;
 
+    // True if BPF offload is supported, false otherwise. The BPF offload could be disabled by
+    // a runtime resource overlay package or device configuration. This flag is only initialized
+    // in the constructor because it is hard to unwind all existing change once device
+    // configuration is changed. Especially the forwarding rules. Keep the same setting
+    // to make it simpler. See also TetheringConfiguration.
+    private final boolean mIsBpfEnabled;
+
     // Tracks whether BPF tethering is started or not. This is set by tethering before it
     // starts the first IpServer and is cleared by tethering shortly before the last IpServer
     // is stopped. Note that rule updates (especially deletions, but sometimes additions as
@@ -142,22 +153,34 @@
     };
 
     @VisibleForTesting
-    public static class Dependencies {
-        int getPerformPollInterval() {
-            // TODO: Consider make this configurable.
-            return DEFAULT_PERFORM_POLL_INTERVAL_MS;
-        }
+    public abstract static class Dependencies {
+        /** Get handler. */
+        @NonNull public abstract Handler getHandler();
+
+        /** Get netd. */
+        @NonNull public abstract INetd getNetd();
+
+        /** Get network stats manager. */
+        @NonNull public abstract NetworkStatsManager getNetworkStatsManager();
+
+        /** Get shared log. */
+        @NonNull public abstract SharedLog getSharedLog();
+
+        /** Get tethering configuration. */
+        @Nullable public abstract TetheringConfiguration getTetherConfig();
     }
 
     @VisibleForTesting
-    public BpfCoordinator(@NonNull Handler handler, @NonNull INetd netd,
-            @NonNull NetworkStatsManager nsm, @NonNull SharedLog log, @NonNull Dependencies deps) {
-        mHandler = handler;
-        mNetd = netd;
-        mLog = log.forSubComponent(TAG);
+    public BpfCoordinator(@NonNull Dependencies deps) {
+        mDeps = deps;
+        mHandler = mDeps.getHandler();
+        mNetd = mDeps.getNetd();
+        mLog = mDeps.getSharedLog().forSubComponent(TAG);
+        mIsBpfEnabled = isBpfEnabled();
         BpfTetherStatsProvider provider = new BpfTetherStatsProvider();
         try {
-            nsm.registerNetworkStatsProvider(getClass().getSimpleName(), provider);
+            mDeps.getNetworkStatsManager().registerNetworkStatsProvider(
+                    getClass().getSimpleName(), provider);
         } catch (RuntimeException e) {
             // TODO: Perhaps not allow to use BPF offload because the reregistration failure
             // implied that no data limit could be applies on a metered upstream if any.
@@ -165,7 +188,6 @@
             provider = null;
         }
         mStatsProvider = provider;
-        mDeps = deps;
     }
 
     /**
@@ -177,6 +199,11 @@
     public void startPolling() {
         if (mPollingStarted) return;
 
+        if (!mIsBpfEnabled) {
+            mLog.i("Offload disabled");
+            return;
+        }
+
         mPollingStarted = true;
         maybeSchedulePollingStats();
 
@@ -211,6 +238,8 @@
      */
     public void tetherOffloadRuleAdd(
             @NonNull final IpServer ipServer, @NonNull final Ipv6ForwardingRule rule) {
+        if (!mIsBpfEnabled) return;
+
         try {
             // TODO: Perhaps avoid to add a duplicate rule.
             mNetd.tetherOffloadRuleAdd(rule.toTetherOffloadRuleParcel());
@@ -250,6 +279,8 @@
      */
     public void tetherOffloadRuleRemove(
             @NonNull final IpServer ipServer, @NonNull final Ipv6ForwardingRule rule) {
+        if (!mIsBpfEnabled) return;
+
         try {
             // TODO: Perhaps avoid to remove a non-existent rule.
             mNetd.tetherOffloadRuleRemove(rule.toTetherOffloadRuleParcel());
@@ -293,6 +324,8 @@
      * Note that this can be only called on handler thread.
      */
     public void tetherOffloadRuleClear(@NonNull final IpServer ipServer) {
+        if (!mIsBpfEnabled) return;
+
         final LinkedHashMap<Inet6Address, Ipv6ForwardingRule> rules = mIpv6ForwardingRules.get(
                 ipServer);
         if (rules == null) return;
@@ -308,6 +341,8 @@
      * Note that this can be only called on handler thread.
      */
     public void tetherOffloadRuleUpdate(@NonNull final IpServer ipServer, int newUpstreamIfindex) {
+        if (!mIsBpfEnabled) return;
+
         final LinkedHashMap<Inet6Address, Ipv6ForwardingRule> rules = mIpv6ForwardingRules.get(
                 ipServer);
         if (rules == null) return;
@@ -330,6 +365,8 @@
      * Note that this can be only called on handler thread.
      */
     public void addUpstreamNameToLookupTable(int upstreamIfindex, @NonNull String upstreamIface) {
+        if (!mIsBpfEnabled) return;
+
         if (upstreamIfindex == 0 || TextUtils.isEmpty(upstreamIface)) return;
 
         // The same interface index to name mapping may be added by different IpServer objects or
@@ -344,6 +381,77 @@
         }
     }
 
+    /**
+     * Dump information.
+     * Block the function until all the data are dumped on the handler thread or timed-out. The
+     * reason is that dumpsys invokes this function on the thread of caller and the data may only
+     * be allowed to be accessed on the handler thread.
+     */
+    public void dump(@NonNull IndentingPrintWriter pw) {
+        final ConditionVariable dumpDone = new ConditionVariable();
+        mHandler.post(() -> {
+            pw.println("mIsBpfEnabled: " + mIsBpfEnabled);
+            pw.println("Polling " + (mPollingStarted ? "started" : "not started"));
+            pw.println("Stats provider " + (mStatsProvider != null
+                    ? "registered" : "not registered"));
+            pw.println("Upstream quota: " + mInterfaceQuotas.toString());
+            pw.println("Polling interval: " + getPollingInterval() + " ms");
+
+            pw.println("Forwarding stats:");
+            pw.increaseIndent();
+            if (mStats.size() == 0) {
+                pw.println("<empty>");
+            } else {
+                dumpStats(pw);
+            }
+            pw.decreaseIndent();
+
+            pw.println("Forwarding rules:");
+            pw.increaseIndent();
+            if (mIpv6ForwardingRules.size() == 0) {
+                pw.println("<empty>");
+            } else {
+                dumpIpv6ForwardingRules(pw);
+            }
+            pw.decreaseIndent();
+
+            dumpDone.open();
+        });
+        if (!dumpDone.block(DUMP_TIMEOUT_MS)) {
+            pw.println("... dump timed-out after " + DUMP_TIMEOUT_MS + "ms");
+        }
+    }
+
+    private void dumpStats(@NonNull IndentingPrintWriter pw) {
+        for (int i = 0; i < mStats.size(); i++) {
+            final int upstreamIfindex = mStats.keyAt(i);
+            final ForwardedStats stats = mStats.get(upstreamIfindex);
+            pw.println(String.format("%d(%s) - %s", upstreamIfindex, mInterfaceNames.get(
+                    upstreamIfindex), stats.toString()));
+        }
+    }
+
+    private void dumpIpv6ForwardingRules(@NonNull IndentingPrintWriter pw) {
+        for (Map.Entry<IpServer, LinkedHashMap<Inet6Address, Ipv6ForwardingRule>> entry :
+                mIpv6ForwardingRules.entrySet()) {
+            IpServer ipServer = entry.getKey();
+            // The rule downstream interface index is paired with the interface name from
+            // IpServer#interfaceName. See #startIPv6, #updateIpv6ForwardingRules in IpServer.
+            final String downstreamIface = ipServer.interfaceName();
+            pw.println("[" + downstreamIface + "]: iif(iface) oif(iface) v6addr srcmac dstmac");
+
+            pw.increaseIndent();
+            LinkedHashMap<Inet6Address, Ipv6ForwardingRule> rules = entry.getValue();
+            for (Ipv6ForwardingRule rule : rules.values()) {
+                final int upstreamIfindex = rule.upstreamIfindex;
+                pw.println(String.format("%d(%s) %d(%s) %s %s %s", upstreamIfindex,
+                        mInterfaceNames.get(upstreamIfindex), rule.downstreamIfindex,
+                        downstreamIface, rule.address, rule.srcMac, rule.dstMac));
+            }
+            pw.decreaseIndent();
+        }
+    }
+
     /** IPv6 forwarding rule class. */
     public static class Ipv6ForwardingRule {
         public final int upstreamIfindex;
@@ -474,6 +582,11 @@
         }
     }
 
+    private boolean isBpfEnabled() {
+        final TetheringConfiguration config = mDeps.getTetherConfig();
+        return (config != null) ? config.isBpfOffloadEnabled() : true /* default value */;
+    }
+
     private int getInterfaceIndexFromRules(@NonNull String ifName) {
         for (LinkedHashMap<Inet6Address, Ipv6ForwardingRule> rules : mIpv6ForwardingRules
                 .values()) {
@@ -625,6 +738,17 @@
         updateQuotaAndStatsFromSnapshot(tetherStatsList);
     }
 
+    @VisibleForTesting
+    int getPollingInterval() {
+        // The valid range of interval is DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS..max_long.
+        // Ignore the config value is less than the minimum polling interval. Note that the
+        // minimum interval definition is invoked as OffloadController#isPollingStatsNeeded does.
+        // TODO: Perhaps define a minimum polling interval constant.
+        final TetheringConfiguration config = mDeps.getTetherConfig();
+        final int configInterval = (config != null) ? config.getOffloadPollInterval() : 0;
+        return Math.max(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS, configInterval);
+    }
+
     private void maybeSchedulePollingStats() {
         if (!mPollingStarted) return;
 
@@ -632,6 +756,23 @@
             mHandler.removeCallbacks(mScheduledPollingTask);
         }
 
-        mHandler.postDelayed(mScheduledPollingTask, mDeps.getPerformPollInterval());
+        mHandler.postDelayed(mScheduledPollingTask, getPollingInterval());
+    }
+
+    // Return forwarding rule map. This is used for testing only.
+    // Note that this can be only called on handler thread.
+    @NonNull
+    @VisibleForTesting
+    final HashMap<IpServer, LinkedHashMap<Inet6Address, Ipv6ForwardingRule>>
+            getForwardingRulesForTesting() {
+        return mIpv6ForwardingRules;
+    }
+
+    // Return upstream interface name map. This is used for testing only.
+    // Note that this can be only called on handler thread.
+    @NonNull
+    @VisibleForTesting
+    final SparseArray<String> getInterfaceNamesForTesting() {
+        return mInterfaceNames;
     }
 }
diff --git a/Tethering/src/com/android/networkstack/tethering/Tethering.java b/Tethering/src/com/android/networkstack/tethering/Tethering.java
index 2f01186..c72ac52 100644
--- a/Tethering/src/com/android/networkstack/tethering/Tethering.java
+++ b/Tethering/src/com/android/networkstack/tethering/Tethering.java
@@ -63,6 +63,7 @@
 
 import static com.android.networkstack.tethering.TetheringNotificationUpdater.DOWNSTREAM_NONE;
 
+import android.app.usage.NetworkStatsManager;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothPan;
 import android.bluetooth.BluetoothProfile;
@@ -286,8 +287,6 @@
         mUpstreamNetworkMonitor = mDeps.getUpstreamNetworkMonitor(mContext, mTetherMasterSM, mLog,
                 TetherMasterSM.EVENT_UPSTREAM_CALLBACK);
         mForwardedDownstreams = new LinkedHashSet<>();
-        mBpfCoordinator = mDeps.getBpfCoordinator(
-                mHandler, mNetd, mLog, new BpfCoordinator.Dependencies());
 
         IntentFilter filter = new IntentFilter();
         filter.addAction(ACTION_CARRIER_CONFIG_CHANGED);
@@ -325,6 +324,36 @@
         // Load tethering configuration.
         updateConfiguration();
 
+        // Must be initialized after tethering configuration is loaded because BpfCoordinator
+        // constructor needs to use the configuration.
+        mBpfCoordinator = mDeps.getBpfCoordinator(
+                new BpfCoordinator.Dependencies() {
+                    @NonNull
+                    public Handler getHandler() {
+                        return mHandler;
+                    }
+
+                    @NonNull
+                    public INetd getNetd() {
+                        return mNetd;
+                    }
+
+                    @NonNull
+                    public NetworkStatsManager getNetworkStatsManager() {
+                        return mContext.getSystemService(NetworkStatsManager.class);
+                    }
+
+                    @NonNull
+                    public SharedLog getSharedLog() {
+                        return mLog;
+                    }
+
+                    @Nullable
+                    public TetheringConfiguration getTetherConfig() {
+                        return mConfig;
+                    }
+                });
+
         startStateMachineUpdaters();
     }
 
@@ -2236,6 +2265,11 @@
         mOffloadController.dump(pw);
         pw.decreaseIndent();
 
+        pw.println("BPF offload:");
+        pw.increaseIndent();
+        mBpfCoordinator.dump(pw);
+        pw.decreaseIndent();
+
         pw.println("Private address coordinator:");
         pw.increaseIndent();
         mPrivateAddressCoordinator.dump(pw);
@@ -2370,7 +2404,7 @@
         final TetherState tetherState = new TetherState(
                 new IpServer(iface, mLooper, interfaceType, mLog, mNetd, mBpfCoordinator,
                              makeControlCallback(), mConfig.enableLegacyDhcpServer,
-                             mConfig.enableBpfOffload, mPrivateAddressCoordinator,
+                             mConfig.isBpfOffloadEnabled(), mPrivateAddressCoordinator,
                              mDeps.getIpServerDependencies()));
         mTetherStates.put(iface, tetherState);
         tetherState.ipServer.start();
diff --git a/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java b/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java
index 1d45f12..18b2b78 100644
--- a/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java
+++ b/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java
@@ -101,8 +101,6 @@
     public final String[] legacyDhcpRanges;
     public final String[] defaultIPv4DNS;
     public final boolean enableLegacyDhcpServer;
-    // TODO: Add to TetheringConfigurationParcel if required.
-    public final boolean enableBpfOffload;
 
     public final String[] provisioningApp;
     public final String provisioningAppNoUi;
@@ -112,6 +110,8 @@
     public final int activeDataSubId;
 
     private final int mOffloadPollInterval;
+    // TODO: Add to TetheringConfigurationParcel if required.
+    private final boolean mEnableBpfOffload;
 
     public TetheringConfiguration(Context ctx, SharedLog log, int id) {
         final SharedLog configLog = log.forSubComponent("config");
@@ -138,7 +138,7 @@
 
         legacyDhcpRanges = getLegacyDhcpRanges(res);
         defaultIPv4DNS = copy(DEFAULT_IPV4_DNS);
-        enableBpfOffload = getEnableBpfOffload(res);
+        mEnableBpfOffload = getEnableBpfOffload(res);
         enableLegacyDhcpServer = getEnableLegacyDhcpServer(res);
 
         provisioningApp = getResourceStringArray(res, R.array.config_mobile_hotspot_provision_app);
@@ -222,7 +222,7 @@
         pw.println(provisioningAppNoUi);
 
         pw.print("enableBpfOffload: ");
-        pw.println(enableBpfOffload);
+        pw.println(mEnableBpfOffload);
 
         pw.print("enableLegacyDhcpServer: ");
         pw.println(enableLegacyDhcpServer);
@@ -244,7 +244,7 @@
                 toIntArray(preferredUpstreamIfaceTypes)));
         sj.add(String.format("provisioningApp:%s", makeString(provisioningApp)));
         sj.add(String.format("provisioningAppNoUi:%s", provisioningAppNoUi));
-        sj.add(String.format("enableBpfOffload:%s", enableBpfOffload));
+        sj.add(String.format("enableBpfOffload:%s", mEnableBpfOffload));
         sj.add(String.format("enableLegacyDhcpServer:%s", enableLegacyDhcpServer));
         return String.format("TetheringConfiguration{%s}", sj.toString());
     }
@@ -283,6 +283,10 @@
         return mOffloadPollInterval;
     }
 
+    public boolean isBpfOffloadEnabled() {
+        return mEnableBpfOffload;
+    }
+
     private static Collection<Integer> getUpstreamIfaceTypes(Resources res, boolean dunRequired) {
         final int[] ifaceTypes = res.getIntArray(R.array.config_tether_upstream_types);
         final ArrayList<Integer> upstreamIfaceTypes = new ArrayList<>(ifaceTypes.length);
diff --git a/Tethering/src/com/android/networkstack/tethering/TetheringDependencies.java b/Tethering/src/com/android/networkstack/tethering/TetheringDependencies.java
index 31f747d..131a5fb 100644
--- a/Tethering/src/com/android/networkstack/tethering/TetheringDependencies.java
+++ b/Tethering/src/com/android/networkstack/tethering/TetheringDependencies.java
@@ -46,11 +46,8 @@
      * Get a reference to the BpfCoordinator to be used by tethering.
      */
     public @NonNull BpfCoordinator getBpfCoordinator(
-            @NonNull Handler handler, @NonNull INetd netd, @NonNull SharedLog log,
             @NonNull BpfCoordinator.Dependencies deps) {
-        final NetworkStatsManager statsManager =
-                (NetworkStatsManager) getContext().getSystemService(Context.NETWORK_STATS_SERVICE);
-        return new BpfCoordinator(handler, netd, statsManager, log, deps);
+        return new BpfCoordinator(deps);
     }
 
     /**
diff --git a/Tethering/tests/unit/src/android/net/ip/IpServerTest.java b/Tethering/tests/unit/src/android/net/ip/IpServerTest.java
index c3bc915..4f88605 100644
--- a/Tethering/tests/unit/src/android/net/ip/IpServerTest.java
+++ b/Tethering/tests/unit/src/android/net/ip/IpServerTest.java
@@ -89,12 +89,14 @@
 import android.text.TextUtils;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.networkstack.tethering.BpfCoordinator;
 import com.android.networkstack.tethering.BpfCoordinator.Ipv6ForwardingRule;
 import com.android.networkstack.tethering.PrivateAddressCoordinator;
+import com.android.networkstack.tethering.TetheringConfiguration;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -142,6 +144,7 @@
     @Mock private IpServer.Dependencies mDependencies;
     @Mock private PrivateAddressCoordinator mAddressCoordinator;
     @Mock private NetworkStatsManager mStatsManager;
+    @Mock private TetheringConfiguration mTetherConfig;
 
     @Captor private ArgumentCaptor<DhcpServingParamsParcel> mDhcpParamsCaptor;
 
@@ -225,10 +228,35 @@
         MockitoAnnotations.initMocks(this);
         when(mSharedLog.forSubComponent(anyString())).thenReturn(mSharedLog);
         when(mAddressCoordinator.requestDownstreamAddress(any())).thenReturn(mTestAddress);
+        when(mTetherConfig.isBpfOffloadEnabled()).thenReturn(true /* default value */);
 
-        BpfCoordinator bc = new BpfCoordinator(new Handler(mLooper.getLooper()), mNetd,
-                mStatsManager, mSharedLog, new BpfCoordinator.Dependencies());
-        mBpfCoordinator = spy(bc);
+        mBpfCoordinator = spy(new BpfCoordinator(
+                new BpfCoordinator.Dependencies() {
+                    @NonNull
+                    public Handler getHandler() {
+                        return new Handler(mLooper.getLooper());
+                    }
+
+                    @NonNull
+                    public INetd getNetd() {
+                        return mNetd;
+                    }
+
+                    @NonNull
+                    public NetworkStatsManager getNetworkStatsManager() {
+                        return mStatsManager;
+                    }
+
+                    @NonNull
+                    public SharedLog getSharedLog() {
+                        return mSharedLog;
+                    }
+
+                    @Nullable
+                    public TetheringConfiguration getTetherConfig() {
+                        return mTetherConfig;
+                    }
+                }));
     }
 
     @Test
@@ -671,18 +699,21 @@
         }
     }
 
-    private TetherOffloadRuleParcel matches(
+    @NonNull
+    private static TetherOffloadRuleParcel matches(
             int upstreamIfindex, InetAddress dst, MacAddress dstMac) {
         return argThat(new TetherOffloadRuleParcelMatcher(upstreamIfindex, dst, dstMac));
     }
 
+    @NonNull
     private static Ipv6ForwardingRule makeForwardingRule(
             int upstreamIfindex, @NonNull InetAddress dst, @NonNull MacAddress dstMac) {
         return new Ipv6ForwardingRule(upstreamIfindex, TEST_IFACE_PARAMS.index,
                 (Inet6Address) dst, TEST_IFACE_PARAMS.macAddr, dstMac);
     }
 
-    private TetherStatsParcel buildEmptyTetherStatsParcel(int ifIndex) {
+    @NonNull
+    private static TetherStatsParcel buildEmptyTetherStatsParcel(int ifIndex) {
         TetherStatsParcel parcel = new TetherStatsParcel();
         parcel.ifIndex = ifIndex;
         return parcel;
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/BpfCoordinatorTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/BpfCoordinatorTest.java
index e2d7aab..64242ae 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/BpfCoordinatorTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/BpfCoordinatorTest.java
@@ -25,48 +25,76 @@
 import static android.net.NetworkStats.UID_TETHERING;
 import static android.net.netstats.provider.NetworkStatsProvider.QUOTA_UNLIMITED;
 
-import static com.android.networkstack.tethering.BpfCoordinator
-        .DEFAULT_PERFORM_POLL_INTERVAL_MS;
 import static com.android.networkstack.tethering.BpfCoordinator.StatsType;
 import static com.android.networkstack.tethering.BpfCoordinator.StatsType.STATS_PER_IFACE;
 import static com.android.networkstack.tethering.BpfCoordinator.StatsType.STATS_PER_UID;
+import static com.android.networkstack.tethering.TetheringConfiguration.DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS;
 
-import static junit.framework.Assert.assertNotNull;
-
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.fail;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.anyLong;
 import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.argThat;
 import static org.mockito.Mockito.clearInvocations;
+import static org.mockito.Mockito.inOrder;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-import android.annotation.NonNull;
 import android.app.usage.NetworkStatsManager;
 import android.net.INetd;
+import android.net.InetAddresses;
+import android.net.MacAddress;
 import android.net.NetworkStats;
+import android.net.TetherOffloadRuleParcel;
 import android.net.TetherStatsParcel;
+import android.net.ip.IpServer;
 import android.net.util.SharedLog;
 import android.os.Handler;
 import android.os.test.TestLooper;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
+import com.android.networkstack.tethering.BpfCoordinator.Ipv6ForwardingRule;
 import com.android.testutils.TestableNetworkStatsProviderCbBinder;
 
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.ArgumentCaptor;
+import org.mockito.ArgumentMatcher;
+import org.mockito.InOrder;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
+import java.net.Inet6Address;
+import java.net.InetAddress;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
 
 @RunWith(AndroidJUnit4.class)
 @SmallTest
 public class BpfCoordinatorTest {
+    private static final int DOWNSTREAM_IFINDEX = 10;
+    private static final MacAddress DOWNSTREAM_MAC = MacAddress.ALL_ZEROS_ADDRESS;
+    private static final InetAddress NEIGH_A = InetAddresses.parseNumericAddress("2001:db8::1");
+    private static final InetAddress NEIGH_B = InetAddresses.parseNumericAddress("2001:db8::2");
+    private static final MacAddress MAC_A = MacAddress.fromString("00:00:00:00:00:0a");
+    private static final MacAddress MAC_B = MacAddress.fromString("11:22:33:00:00:0b");
+
     @Mock private NetworkStatsManager mStatsManager;
     @Mock private INetd mNetd;
+    @Mock private IpServer mIpServer;
+    @Mock private TetheringConfiguration mTetherConfig;
+
     // Late init since methods must be called by the thread that created this object.
     private TestableNetworkStatsProviderCbBinder mTetherStatsProviderCb;
     private BpfCoordinator.BpfTetherStatsProvider mTetherStatsProvider;
@@ -75,14 +103,35 @@
     private final TestLooper mTestLooper = new TestLooper();
     private BpfCoordinator.Dependencies mDeps =
             new BpfCoordinator.Dependencies() {
-            @Override
-            int getPerformPollInterval() {
-                return DEFAULT_PERFORM_POLL_INTERVAL_MS;
+            @NonNull
+            public Handler getHandler() {
+                return new Handler(mTestLooper.getLooper());
+            }
+
+            @NonNull
+            public INetd getNetd() {
+                return mNetd;
+            }
+
+            @NonNull
+            public NetworkStatsManager getNetworkStatsManager() {
+                return mStatsManager;
+            }
+
+            @NonNull
+            public SharedLog getSharedLog() {
+                return new SharedLog("test");
+            }
+
+            @Nullable
+            public TetheringConfiguration getTetherConfig() {
+                return mTetherConfig;
             }
     };
 
     @Before public void setUp() {
         MockitoAnnotations.initMocks(this);
+        when(mTetherConfig.isBpfOffloadEnabled()).thenReturn(true /* default value */);
     }
 
     private void waitForIdle() {
@@ -95,9 +144,7 @@
 
     @NonNull
     private BpfCoordinator makeBpfCoordinator() throws Exception {
-        BpfCoordinator coordinator = new BpfCoordinator(
-                new Handler(mTestLooper.getLooper()), mNetd, mStatsManager, new SharedLog("test"),
-                mDeps);
+        final BpfCoordinator coordinator = new BpfCoordinator(mDeps);
         final ArgumentCaptor<BpfCoordinator.BpfTetherStatsProvider>
                 tetherStatsProviderCaptor =
                 ArgumentCaptor.forClass(BpfCoordinator.BpfTetherStatsProvider.class);
@@ -130,9 +177,11 @@
         return parcel;
     }
 
+    // Set up specific tether stats list and wait for the stats cache is updated by polling thread
+    // in the coordinator. Beware of that it is only used for the default polling interval.
     private void setTetherOffloadStatsList(TetherStatsParcel[] tetherStatsList) throws Exception {
         when(mNetd.tetherOffloadGetStats()).thenReturn(tetherStatsList);
-        mTestLooper.moveTimeForward(DEFAULT_PERFORM_POLL_INTERVAL_MS);
+        mTestLooper.moveTimeForward(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS);
         waitForIdle();
     }
 
@@ -201,7 +250,7 @@
         clearInvocations(mNetd);
 
         // Verify the polling update thread stopped.
-        mTestLooper.moveTimeForward(DEFAULT_PERFORM_POLL_INTERVAL_MS);
+        mTestLooper.moveTimeForward(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS);
         waitForIdle();
         verify(mNetd, never()).tetherOffloadGetStats();
     }
@@ -226,21 +275,333 @@
         when(mNetd.tetherOffloadGetStats()).thenReturn(
                 new TetherStatsParcel[] {buildTestTetherStatsParcel(mobileIfIndex, 0, 0, 0, 0)});
         mTetherStatsProvider.onSetAlert(100);
-        mTestLooper.moveTimeForward(DEFAULT_PERFORM_POLL_INTERVAL_MS);
+        mTestLooper.moveTimeForward(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS);
         waitForIdle();
         mTetherStatsProviderCb.assertNoCallback();
 
         // Verify that notifyAlertReached fired when quota is reached.
         when(mNetd.tetherOffloadGetStats()).thenReturn(
                 new TetherStatsParcel[] {buildTestTetherStatsParcel(mobileIfIndex, 50, 0, 50, 0)});
-        mTestLooper.moveTimeForward(DEFAULT_PERFORM_POLL_INTERVAL_MS);
+        mTestLooper.moveTimeForward(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS);
         waitForIdle();
         mTetherStatsProviderCb.expectNotifyAlertReached();
 
         // Verify that set quota with UNLIMITED won't trigger any callback.
         mTetherStatsProvider.onSetAlert(QUOTA_UNLIMITED);
-        mTestLooper.moveTimeForward(DEFAULT_PERFORM_POLL_INTERVAL_MS);
+        mTestLooper.moveTimeForward(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS);
         waitForIdle();
         mTetherStatsProviderCb.assertNoCallback();
     }
+
+    // The custom ArgumentMatcher simply comes from IpServerTest.
+    // TODO: move both of them into a common utility class for reusing the code.
+    private static class TetherOffloadRuleParcelMatcher implements
+            ArgumentMatcher<TetherOffloadRuleParcel> {
+        public final int upstreamIfindex;
+        public final int downstreamIfindex;
+        public final Inet6Address address;
+        public final MacAddress srcMac;
+        public final MacAddress dstMac;
+
+        TetherOffloadRuleParcelMatcher(@NonNull Ipv6ForwardingRule rule) {
+            upstreamIfindex = rule.upstreamIfindex;
+            downstreamIfindex = rule.downstreamIfindex;
+            address = rule.address;
+            srcMac = rule.srcMac;
+            dstMac = rule.dstMac;
+        }
+
+        public boolean matches(@NonNull TetherOffloadRuleParcel parcel) {
+            return upstreamIfindex == parcel.inputInterfaceIndex
+                    && (downstreamIfindex == parcel.outputInterfaceIndex)
+                    && Arrays.equals(address.getAddress(), parcel.destination)
+                    && (128 == parcel.prefixLength)
+                    && Arrays.equals(srcMac.toByteArray(), parcel.srcL2Address)
+                    && Arrays.equals(dstMac.toByteArray(), parcel.dstL2Address);
+        }
+
+        public String toString() {
+            return String.format("TetherOffloadRuleParcelMatcher(%d, %d, %s, %s, %s",
+                    upstreamIfindex, downstreamIfindex, address.getHostAddress(), srcMac, dstMac);
+        }
+    }
+
+    @NonNull
+    private TetherOffloadRuleParcel matches(@NonNull Ipv6ForwardingRule rule) {
+        return argThat(new TetherOffloadRuleParcelMatcher(rule));
+    }
+
+    @NonNull
+    private static Ipv6ForwardingRule buildTestForwardingRule(
+            int upstreamIfindex, @NonNull InetAddress address, @NonNull MacAddress dstMac) {
+        return new Ipv6ForwardingRule(upstreamIfindex, DOWNSTREAM_IFINDEX, (Inet6Address) address,
+                DOWNSTREAM_MAC, dstMac);
+    }
+
+    @Test
+    public void testSetDataLimit() throws Exception {
+        setupFunctioningNetdInterface();
+
+        final BpfCoordinator coordinator = makeBpfCoordinator();
+
+        final String mobileIface = "rmnet_data0";
+        final Integer mobileIfIndex = 100;
+        coordinator.addUpstreamNameToLookupTable(mobileIfIndex, mobileIface);
+
+        // [1] Default limit.
+        // Set the unlimited quota as default if the service has never applied a data limit for a
+        // given upstream. Note that the data limit only be applied on an upstream which has rules.
+        final Ipv6ForwardingRule rule = buildTestForwardingRule(mobileIfIndex, NEIGH_A, MAC_A);
+        final InOrder inOrder = inOrder(mNetd);
+        coordinator.tetherOffloadRuleAdd(mIpServer, rule);
+        inOrder.verify(mNetd).tetherOffloadRuleAdd(matches(rule));
+        inOrder.verify(mNetd).tetherOffloadSetInterfaceQuota(mobileIfIndex, QUOTA_UNLIMITED);
+        inOrder.verifyNoMoreInteractions();
+
+        // [2] Specific limit.
+        // Applying the data limit boundary {min, 1gb, max, infinity} on current upstream.
+        for (final long quota : new long[] {0, 1048576000, Long.MAX_VALUE, QUOTA_UNLIMITED}) {
+            mTetherStatsProvider.onSetLimit(mobileIface, quota);
+            waitForIdle();
+            inOrder.verify(mNetd).tetherOffloadSetInterfaceQuota(mobileIfIndex, quota);
+            inOrder.verifyNoMoreInteractions();
+        }
+
+        // [3] Invalid limit.
+        // The valid range of quota is 0..max_int64 or -1 (unlimited).
+        final long invalidLimit = Long.MIN_VALUE;
+        try {
+            mTetherStatsProvider.onSetLimit(mobileIface, invalidLimit);
+            waitForIdle();
+            fail("No exception thrown for invalid limit " + invalidLimit + ".");
+        } catch (IllegalArgumentException expected) {
+            assertEquals(expected.getMessage(), "invalid quota value " + invalidLimit);
+        }
+    }
+
+    // TODO: Test the case in which the rules are changed from different IpServer objects.
+    @Test
+    public void testSetDataLimitOnRuleChange() throws Exception {
+        setupFunctioningNetdInterface();
+
+        final BpfCoordinator coordinator = makeBpfCoordinator();
+
+        final String mobileIface = "rmnet_data0";
+        final Integer mobileIfIndex = 100;
+        coordinator.addUpstreamNameToLookupTable(mobileIfIndex, mobileIface);
+
+        // Applying a data limit to the current upstream does not take any immediate action.
+        // The data limit could be only set on an upstream which has rules.
+        final long limit = 12345;
+        final InOrder inOrder = inOrder(mNetd);
+        mTetherStatsProvider.onSetLimit(mobileIface, limit);
+        waitForIdle();
+        inOrder.verify(mNetd, never()).tetherOffloadSetInterfaceQuota(anyInt(), anyLong());
+
+        // Adding the first rule on current upstream immediately sends the quota to netd.
+        final Ipv6ForwardingRule ruleA = buildTestForwardingRule(mobileIfIndex, NEIGH_A, MAC_A);
+        coordinator.tetherOffloadRuleAdd(mIpServer, ruleA);
+        inOrder.verify(mNetd).tetherOffloadRuleAdd(matches(ruleA));
+        inOrder.verify(mNetd).tetherOffloadSetInterfaceQuota(mobileIfIndex, limit);
+        inOrder.verifyNoMoreInteractions();
+
+        // Adding the second rule on current upstream does not send the quota to netd.
+        final Ipv6ForwardingRule ruleB = buildTestForwardingRule(mobileIfIndex, NEIGH_B, MAC_B);
+        coordinator.tetherOffloadRuleAdd(mIpServer, ruleB);
+        inOrder.verify(mNetd).tetherOffloadRuleAdd(matches(ruleB));
+        inOrder.verify(mNetd, never()).tetherOffloadSetInterfaceQuota(anyInt(), anyLong());
+
+        // Removing the second rule on current upstream does not send the quota to netd.
+        coordinator.tetherOffloadRuleRemove(mIpServer, ruleB);
+        inOrder.verify(mNetd).tetherOffloadRuleRemove(matches(ruleB));
+        inOrder.verify(mNetd, never()).tetherOffloadSetInterfaceQuota(anyInt(), anyLong());
+
+        // Removing the last rule on current upstream immediately sends the cleanup stuff to netd.
+        when(mNetd.tetherOffloadGetAndClearStats(mobileIfIndex))
+                .thenReturn(buildTestTetherStatsParcel(mobileIfIndex, 0, 0, 0, 0));
+        coordinator.tetherOffloadRuleRemove(mIpServer, ruleA);
+        inOrder.verify(mNetd).tetherOffloadRuleRemove(matches(ruleA));
+        inOrder.verify(mNetd).tetherOffloadGetAndClearStats(mobileIfIndex);
+        inOrder.verifyNoMoreInteractions();
+    }
+
+    @Test
+    public void testTetherOffloadRuleUpdateAndClear() throws Exception {
+        setupFunctioningNetdInterface();
+
+        final BpfCoordinator coordinator = makeBpfCoordinator();
+
+        final String ethIface = "eth1";
+        final String mobileIface = "rmnet_data0";
+        final Integer ethIfIndex = 100;
+        final Integer mobileIfIndex = 101;
+        coordinator.addUpstreamNameToLookupTable(ethIfIndex, ethIface);
+        coordinator.addUpstreamNameToLookupTable(mobileIfIndex, mobileIface);
+
+        final InOrder inOrder = inOrder(mNetd);
+
+        // Before the rule test, here are the additional actions while the rules are changed.
+        // - After adding the first rule on a given upstream, the coordinator adds a data limit.
+        //   If the service has never applied the data limit, set an unlimited quota as default.
+        // - After removing the last rule on a given upstream, the coordinator gets the last stats.
+        //   Then, it clears the stats and the limit entry from BPF maps.
+        // See tetherOffloadRule{Add, Remove, Clear, Clean}.
+
+        // [1] Adding rules on the upstream Ethernet.
+        // Note that the default data limit is applied after the first rule is added.
+        final Ipv6ForwardingRule ethernetRuleA = buildTestForwardingRule(
+                ethIfIndex, NEIGH_A, MAC_A);
+        final Ipv6ForwardingRule ethernetRuleB = buildTestForwardingRule(
+                ethIfIndex, NEIGH_B, MAC_B);
+
+        coordinator.tetherOffloadRuleAdd(mIpServer, ethernetRuleA);
+        inOrder.verify(mNetd).tetherOffloadRuleAdd(matches(ethernetRuleA));
+        inOrder.verify(mNetd).tetherOffloadSetInterfaceQuota(ethIfIndex, QUOTA_UNLIMITED);
+
+        coordinator.tetherOffloadRuleAdd(mIpServer, ethernetRuleB);
+        inOrder.verify(mNetd).tetherOffloadRuleAdd(matches(ethernetRuleB));
+
+        // [2] Update the existing rules from Ethernet to cellular.
+        final Ipv6ForwardingRule mobileRuleA = buildTestForwardingRule(
+                mobileIfIndex, NEIGH_A, MAC_A);
+        final Ipv6ForwardingRule mobileRuleB = buildTestForwardingRule(
+                mobileIfIndex, NEIGH_B, MAC_B);
+        when(mNetd.tetherOffloadGetAndClearStats(ethIfIndex))
+                .thenReturn(buildTestTetherStatsParcel(ethIfIndex, 10, 20, 30, 40));
+
+        // Update the existing rules for upstream changes. The rules are removed and re-added one
+        // by one for updating upstream interface index by #tetherOffloadRuleUpdate.
+        coordinator.tetherOffloadRuleUpdate(mIpServer, mobileIfIndex);
+        inOrder.verify(mNetd).tetherOffloadRuleRemove(matches(ethernetRuleA));
+        inOrder.verify(mNetd).tetherOffloadRuleAdd(matches(mobileRuleA));
+        inOrder.verify(mNetd).tetherOffloadSetInterfaceQuota(mobileIfIndex, QUOTA_UNLIMITED);
+        inOrder.verify(mNetd).tetherOffloadRuleRemove(matches(ethernetRuleB));
+        inOrder.verify(mNetd).tetherOffloadGetAndClearStats(ethIfIndex);
+        inOrder.verify(mNetd).tetherOffloadRuleAdd(matches(mobileRuleB));
+
+        // [3] Clear all rules for a given IpServer.
+        when(mNetd.tetherOffloadGetAndClearStats(mobileIfIndex))
+                .thenReturn(buildTestTetherStatsParcel(mobileIfIndex, 50, 60, 70, 80));
+        coordinator.tetherOffloadRuleClear(mIpServer);
+        inOrder.verify(mNetd).tetherOffloadRuleRemove(matches(mobileRuleA));
+        inOrder.verify(mNetd).tetherOffloadRuleRemove(matches(mobileRuleB));
+        inOrder.verify(mNetd).tetherOffloadGetAndClearStats(mobileIfIndex);
+
+        // [4] Force pushing stats update to verify that the last diff of stats is reported on all
+        // upstreams.
+        mTetherStatsProvider.pushTetherStats();
+        mTetherStatsProviderCb.expectNotifyStatsUpdated(
+                new NetworkStats(0L, 2)
+                .addEntry(buildTestEntry(STATS_PER_IFACE, ethIface, 10, 20, 30, 40))
+                .addEntry(buildTestEntry(STATS_PER_IFACE, mobileIface, 50, 60, 70, 80)),
+                new NetworkStats(0L, 2)
+                .addEntry(buildTestEntry(STATS_PER_UID, ethIface, 10, 20, 30, 40))
+                .addEntry(buildTestEntry(STATS_PER_UID, mobileIface, 50, 60, 70, 80)));
+    }
+
+    @Test
+    public void testTetheringConfigDisable() throws Exception {
+        setupFunctioningNetdInterface();
+        when(mTetherConfig.isBpfOffloadEnabled()).thenReturn(false);
+
+        final BpfCoordinator coordinator = makeBpfCoordinator();
+        coordinator.startPolling();
+
+        // The tether stats polling task should not be scheduled.
+        mTestLooper.moveTimeForward(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS);
+        waitForIdle();
+        verify(mNetd, never()).tetherOffloadGetStats();
+
+        // The interface name lookup table can't be added.
+        final String iface = "rmnet_data0";
+        final Integer ifIndex = 100;
+        coordinator.addUpstreamNameToLookupTable(ifIndex, iface);
+        assertEquals(0, coordinator.getInterfaceNamesForTesting().size());
+
+        // The rule can't be added.
+        final InetAddress neigh = InetAddresses.parseNumericAddress("2001:db8::1");
+        final MacAddress mac = MacAddress.fromString("00:00:00:00:00:0a");
+        final Ipv6ForwardingRule rule = buildTestForwardingRule(ifIndex, neigh, mac);
+        coordinator.tetherOffloadRuleAdd(mIpServer, rule);
+        verify(mNetd, never()).tetherOffloadRuleAdd(any());
+        LinkedHashMap<Inet6Address, Ipv6ForwardingRule> rules =
+                coordinator.getForwardingRulesForTesting().get(mIpServer);
+        assertNull(rules);
+
+        // The rule can't be removed. This is not a realistic case because adding rule is not
+        // allowed. That implies no rule could be removed, cleared or updated. Verify these
+        // cases just in case.
+        rules = new LinkedHashMap<Inet6Address, Ipv6ForwardingRule>();
+        rules.put(rule.address, rule);
+        coordinator.getForwardingRulesForTesting().put(mIpServer, rules);
+        coordinator.tetherOffloadRuleRemove(mIpServer, rule);
+        verify(mNetd, never()).tetherOffloadRuleRemove(any());
+        rules = coordinator.getForwardingRulesForTesting().get(mIpServer);
+        assertNotNull(rules);
+        assertEquals(1, rules.size());
+
+        // The rule can't be cleared.
+        coordinator.tetherOffloadRuleClear(mIpServer);
+        verify(mNetd, never()).tetherOffloadRuleRemove(any());
+        rules = coordinator.getForwardingRulesForTesting().get(mIpServer);
+        assertNotNull(rules);
+        assertEquals(1, rules.size());
+
+        // The rule can't be updated.
+        coordinator.tetherOffloadRuleUpdate(mIpServer, rule.upstreamIfindex + 1 /* new */);
+        verify(mNetd, never()).tetherOffloadRuleRemove(any());
+        verify(mNetd, never()).tetherOffloadRuleAdd(any());
+        rules = coordinator.getForwardingRulesForTesting().get(mIpServer);
+        assertNotNull(rules);
+        assertEquals(1, rules.size());
+    }
+
+    @Test
+    public void testTetheringConfigSetPollingInterval() throws Exception {
+        setupFunctioningNetdInterface();
+
+        final BpfCoordinator coordinator = makeBpfCoordinator();
+
+        // [1] The default polling interval.
+        coordinator.startPolling();
+        assertEquals(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS, coordinator.getPollingInterval());
+        coordinator.stopPolling();
+
+        // [2] Expect the invalid polling interval isn't applied. The valid range of interval is
+        // DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS..max_long.
+        for (final int interval
+                : new int[] {0, 100, DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS - 1}) {
+            when(mTetherConfig.getOffloadPollInterval()).thenReturn(interval);
+            coordinator.startPolling();
+            assertEquals(DEFAULT_TETHER_OFFLOAD_POLL_INTERVAL_MS, coordinator.getPollingInterval());
+            coordinator.stopPolling();
+        }
+
+        // [3] Set a specific polling interval which is larger than default value.
+        // Use a large polling interval to avoid flaky test because the time forwarding
+        // approximation is used to verify the scheduled time of the polling thread.
+        final int pollingInterval = 100_000;
+        when(mTetherConfig.getOffloadPollInterval()).thenReturn(pollingInterval);
+        coordinator.startPolling();
+
+        // Expect the specific polling interval to be applied.
+        assertEquals(pollingInterval, coordinator.getPollingInterval());
+
+        // Start on a new polling time slot.
+        mTestLooper.moveTimeForward(pollingInterval);
+        waitForIdle();
+        clearInvocations(mNetd);
+
+        // Move time forward to 90% polling interval time. Expect that the polling thread has not
+        // scheduled yet.
+        mTestLooper.moveTimeForward((long) (pollingInterval * 0.9));
+        waitForIdle();
+        verify(mNetd, never()).tetherOffloadGetStats();
+
+        // Move time forward to the remaining 10% polling interval time. Expect that the polling
+        // thread has scheduled.
+        mTestLooper.moveTimeForward((long) (pollingInterval * 0.1));
+        waitForIdle();
+        verify(mNetd).tetherOffloadGetStats();
+    }
 }
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java
index 3121863..a9ac4e2 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java
@@ -294,7 +294,7 @@
         initializeBpfOffloadConfiguration(true, null /* unset */);
         final TetheringConfiguration enableByRes =
                 new TetheringConfiguration(mMockContext, mLog, INVALID_SUBSCRIPTION_ID);
-        assertTrue(enableByRes.enableBpfOffload);
+        assertTrue(enableByRes.isBpfOffloadEnabled());
     }
 
     @Test
@@ -303,7 +303,7 @@
             initializeBpfOffloadConfiguration(res, "true");
             final TetheringConfiguration enableByDevConOverride =
                     new TetheringConfiguration(mMockContext, mLog, INVALID_SUBSCRIPTION_ID);
-            assertTrue(enableByDevConOverride.enableBpfOffload);
+            assertTrue(enableByDevConOverride.isBpfOffloadEnabled());
         }
     }
 
@@ -312,7 +312,7 @@
         initializeBpfOffloadConfiguration(false, null /* unset */);
         final TetheringConfiguration disableByRes =
                 new TetheringConfiguration(mMockContext, mLog, INVALID_SUBSCRIPTION_ID);
-        assertFalse(disableByRes.enableBpfOffload);
+        assertFalse(disableByRes.isBpfOffloadEnabled());
     }
 
     @Test
@@ -321,7 +321,7 @@
             initializeBpfOffloadConfiguration(res, "false");
             final TetheringConfiguration disableByDevConOverride =
                     new TetheringConfiguration(mMockContext, mLog, INVALID_SUBSCRIPTION_ID);
-            assertFalse(disableByDevConOverride.enableBpfOffload);
+            assertFalse(disableByDevConOverride.isBpfOffloadEnabled());
         }
     }
 
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index f53c42b..5261992 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -346,8 +346,8 @@
         }
 
         @Override
-        public BpfCoordinator getBpfCoordinator(Handler handler, INetd netd,
-                SharedLog log, BpfCoordinator.Dependencies deps) {
+        public BpfCoordinator getBpfCoordinator(
+                BpfCoordinator.Dependencies deps) {
             return mBpfCoordinator;
         }