Remove ConnectivityManager swapActiveStatsMap API

swapActiveStatsMap is temporary added for the NetworkStatsFactory to
call BpfNetMaps#swapActiveStatsMap in tethering mainline module. Now
NetworkStatsFactory already be mainlined, calling BpfNetMaps#swapActiveStatsMap
directly.

Bug: 218494448
Test: atest ConnectivityCoverageTests
      atest FrameworksNetTests
Change-Id: I25618020c078c7de3f0036c48d06d7816a431f62

service-t/src/com/android/server/net/NetworkStatsFactory.java

@@ -25,9 +25,9 @@ import static android.net.NetworkStats.UID_ALL;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.Context;
-import android.net.ConnectivityManager;
 import android.net.NetworkStats;
 import android.net.UnderlyingNetworkInfo;
+import android.os.ServiceSpecificException;
 import android.os.StrictMode;
 import android.os.SystemClock;
 
@@ -35,6 +35,7 @@ import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.ProcFileReader;
 import com.android.net.module.util.CollectionUtils;
+import com.android.server.BpfNetMaps;
 
 import libcore.io.IoUtils;
 
@@ -74,6 +75,8 @@ public class NetworkStatsFactory {
 
     private final Context mContext;
 
+    private final BpfNetMaps mBpfNetMaps;
+
     /**
      * Guards persistent data access in this class
      *
@@ -170,6 +173,7 @@ public class NetworkStatsFactory {
         mStatsXtIfaceFmt = new File(procRoot, "net/xt_qtaguid/iface_stat_fmt");
         mStatsXtUid = new File(procRoot, "net/xt_qtaguid/stats");
         mUseBpfStats = useBpfStats;
+        mBpfNetMaps = new BpfNetMaps();
         synchronized (mPersistentDataLock) {
             mPersistSnapshot = new NetworkStats(SystemClock.elapsedRealtime(), -1);
             mTunAnd464xlatAdjustedStats = new NetworkStats(SystemClock.elapsedRealtime(), -1);
@@ -297,12 +301,14 @@ public class NetworkStatsFactory {
     }
 
     @GuardedBy("mPersistentDataLock")
-    private void requestSwapActiveStatsMapLocked() {
-        // Do a active map stats swap. When the binder call successfully returns,
-        // the system server should be able to safely read and clean the inactive map
-        // without race problem.
-        final ConnectivityManager cm = mContext.getSystemService(ConnectivityManager.class);
-        cm.swapActiveStatsMap();
+    private void requestSwapActiveStatsMapLocked() throws IOException {
+        try {
+            // Do a active map stats swap. Once the swap completes, this code
+            // can read and clean the inactive map without races.
+            mBpfNetMaps.swapActiveStatsMap();
+        } catch (ServiceSpecificException e) {
+            throw new IOException(e);
+        }
     }
 
     /**
@@ -328,11 +334,7 @@ public class NetworkStatsFactory {
                 final NetworkStats stats =
                         new NetworkStats(SystemClock.elapsedRealtime(), 0 /* initialSize */);
                 if (mUseBpfStats) {
-                    try {
-                        requestSwapActiveStatsMapLocked();
-                    } catch (RuntimeException e) {
-                        throw new IOException(e);
-                    }
+                    requestSwapActiveStatsMapLocked();
                     // Stats are always read from the inactive map, so they must be read after the
                     // swap
                     if (nativeReadNetworkStatsDetail(stats, mStatsXtUid.getAbsolutePath(), UID_ALL,