diff --git a/framework-t/src/android/net/EthernetManager.java b/framework-t/src/android/net/EthernetManager.java
index 72243f9..eba51c1 100644
--- a/framework-t/src/android/net/EthernetManager.java
+++ b/framework-t/src/android/net/EthernetManager.java
@@ -511,7 +511,6 @@
             NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK,
             android.Manifest.permission.NETWORK_STACK,
             android.Manifest.permission.MANAGE_ETHERNET_NETWORKS})
-    @RequiresFeature(PackageManager.FEATURE_AUTOMOTIVE)
     public void updateConfiguration(
             @NonNull String iface,
             @NonNull EthernetNetworkUpdateRequest request,
diff --git a/framework-t/src/android/net/EthernetNetworkUpdateRequest.java b/framework-t/src/android/net/EthernetNetworkUpdateRequest.java
index a626971..43f4c40 100644
--- a/framework-t/src/android/net/EthernetNetworkUpdateRequest.java
+++ b/framework-t/src/android/net/EthernetNetworkUpdateRequest.java
@@ -24,36 +24,52 @@
 
 import java.util.Objects;
 
-/** @hide */
+/**
+ * Represents a request to update an existing Ethernet interface.
+ *
+ * @see EthernetManager#updateConfiguration
+ *
+ * @hide
+ */
 @SystemApi
 public final class EthernetNetworkUpdateRequest implements Parcelable {
     @NonNull
     private final IpConfiguration mIpConfig;
-    @NonNull
+    @Nullable
     private final NetworkCapabilities mNetworkCapabilities;
 
+    /**
+     * @return the new {@link IpConfiguration}.
+     */
     @NonNull
     public IpConfiguration getIpConfiguration() {
         return new IpConfiguration(mIpConfig);
     }
 
-    @NonNull
+    /**
+     * Setting the {@link NetworkCapabilities} is optional in {@link EthernetNetworkUpdateRequest}.
+     * When set to null, the existing NetworkCapabilities are not updated.
+     *
+     * @return the new {@link NetworkCapabilities} or null.
+     */
+    @Nullable
     public NetworkCapabilities getNetworkCapabilities() {
-        return new NetworkCapabilities(mNetworkCapabilities);
+        return mNetworkCapabilities == null ? null : new NetworkCapabilities(mNetworkCapabilities);
     }
 
     private EthernetNetworkUpdateRequest(@NonNull final IpConfiguration ipConfig,
-            @NonNull final NetworkCapabilities networkCapabilities) {
+            @Nullable final NetworkCapabilities networkCapabilities) {
         Objects.requireNonNull(ipConfig);
-        Objects.requireNonNull(networkCapabilities);
-        mIpConfig = new IpConfiguration(ipConfig);
-        mNetworkCapabilities = new NetworkCapabilities(networkCapabilities);
+        mIpConfig = ipConfig;
+        mNetworkCapabilities = networkCapabilities;
     }
 
     private EthernetNetworkUpdateRequest(@NonNull final Parcel source) {
         Objects.requireNonNull(source);
-        mIpConfig = IpConfiguration.CREATOR.createFromParcel(source);
-        mNetworkCapabilities = NetworkCapabilities.CREATOR.createFromParcel(source);
+        mIpConfig = source.readParcelable(IpConfiguration.class.getClassLoader(),
+                IpConfiguration.class);
+        mNetworkCapabilities = source.readParcelable(NetworkCapabilities.class.getClassLoader(),
+                NetworkCapabilities.class);
     }
 
     /**
@@ -75,7 +91,8 @@
         public Builder(@NonNull final EthernetNetworkUpdateRequest request) {
             Objects.requireNonNull(request);
             mBuilderIpConfig = new IpConfiguration(request.mIpConfig);
-            mBuilderNetworkCapabilities = new NetworkCapabilities(request.mNetworkCapabilities);
+            mBuilderNetworkCapabilities = null == request.mNetworkCapabilities
+                    ? null : new NetworkCapabilities(request.mNetworkCapabilities);
         }
 
         /**
@@ -85,7 +102,6 @@
          */
         @NonNull
         public Builder setIpConfiguration(@NonNull final IpConfiguration ipConfig) {
-            Objects.requireNonNull(ipConfig);
             mBuilderIpConfig = new IpConfiguration(ipConfig);
             return this;
         }
@@ -96,9 +112,8 @@
          * @return The builder to facilitate chaining.
          */
         @NonNull
-        public Builder setNetworkCapabilities(@NonNull final NetworkCapabilities nc) {
-            Objects.requireNonNull(nc);
-            mBuilderNetworkCapabilities = new NetworkCapabilities(nc);
+        public Builder setNetworkCapabilities(@Nullable final NetworkCapabilities nc) {
+            mBuilderNetworkCapabilities = nc == null ? null : new NetworkCapabilities(nc);
             return this;
         }
 
@@ -135,8 +150,8 @@
 
     @Override
     public void writeToParcel(@NonNull Parcel dest, int flags) {
-        mIpConfig.writeToParcel(dest, flags);
-        mNetworkCapabilities.writeToParcel(dest, flags);
+        dest.writeParcelable(mIpConfig, flags);
+        dest.writeParcelable(mNetworkCapabilities, flags);
     }
 
     @Override
diff --git a/framework-t/src/android/net/NetworkStats.java b/framework-t/src/android/net/NetworkStats.java
index f681ba1..06f2a62 100644
--- a/framework-t/src/android/net/NetworkStats.java
+++ b/framework-t/src/android/net/NetworkStats.java
@@ -327,16 +327,11 @@
          * @param uid uid of this {@link Entry}. {@link #UID_TETHERING} if this {@link Entry} is
          *            for tethering. Or {@link #UID_ALL} if this {@link NetworkStats} is only
          *            counting iface stats.
-         * @param set usage state of this {@link Entry}. Should be one of the following
-         *            values: {@link #SET_DEFAULT}, {@link #SET_FOREGROUND}.
+         * @param set usage state of this {@link Entry}.
          * @param tag tag of this {@link Entry}.
-         * @param metered metered state of this {@link Entry}. Should be one of the following
-         *                values: {link #METERED_YES}, {link #METERED_NO}.
-         * @param roaming roaming state of this {@link Entry}. Should be one of the following
-         *                values: {link #ROAMING_YES}, {link #ROAMING_NO}.
-         * @param defaultNetwork default network status of this {@link Entry}. Should be one
-         *                       of the following values: {link #DEFAULT_NETWORK_YES},
-         *                       {link #DEFAULT_NETWORK_NO}.
+         * @param metered metered state of this {@link Entry}.
+         * @param roaming roaming state of this {@link Entry}.
+         * @param defaultNetwork default network status of this {@link Entry}.
          * @param rxBytes Number of bytes received for this {@link Entry}. Statistics should
          *                represent the contents of IP packets, including IP headers.
          * @param rxPackets Number of packets received for this {@link Entry}. Statistics should
@@ -401,8 +396,7 @@
         }
 
         /**
-         * @return the set state of this entry. Should be one of the following
-         * values: {@link #SET_DEFAULT}, {@link #SET_FOREGROUND}.
+         * @return the set state of this entry.
          */
         @State public int getSet() {
             return set;
@@ -416,24 +410,21 @@
         }
 
         /**
-         * @return the metered state. Should be one of the following
-         * values: {link #METERED_YES}, {link #METERED_NO}.
+         * @return the metered state.
          */
         @Meteredness public int getMetered() {
             return metered;
         }
 
         /**
-         * @return the roaming state. Should be one of the following
-         * values: {link #ROAMING_YES}, {link #ROAMING_NO}.
+         * @return the roaming state.
          */
         @Roaming public int getRoaming() {
             return roaming;
         }
 
         /**
-         * @return the default network state. Should be one of the following
-         * values: {link #DEFAULT_NETWORK_YES}, {link #DEFAULT_NETWORK_NO}.
+         * @return the default network state.
          */
         @DefaultNetwork public int getDefaultNetwork() {
             return defaultNetwork;
diff --git a/framework-t/src/android/net/NetworkStatsCollection.java b/framework-t/src/android/net/NetworkStatsCollection.java
index 67d48f0..1ddc78b 100644
--- a/framework-t/src/android/net/NetworkStatsCollection.java
+++ b/framework-t/src/android/net/NetworkStatsCollection.java
@@ -36,6 +36,7 @@
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.SystemApi;
+import android.net.NetworkStats.State;
 import android.net.NetworkStatsHistory.Entry;
 import android.os.Binder;
 import android.service.NetworkStatsCollectionKeyProto;
@@ -102,7 +103,7 @@
 
     private ArrayMap<Key, NetworkStatsHistory> mStats = new ArrayMap<>();
 
-    private final long mBucketDuration;
+    private final long mBucketDurationMillis;
 
     private long mStartMillis;
     private long mEndMillis;
@@ -115,8 +116,8 @@
      * @param bucketDuration duration of the buckets in this object, in milliseconds.
      * @hide
      */
-    public NetworkStatsCollection(long bucketDuration) {
-        mBucketDuration = bucketDuration;
+    public NetworkStatsCollection(long bucketDurationMillis) {
+        mBucketDurationMillis = bucketDurationMillis;
         reset();
     }
 
@@ -148,7 +149,7 @@
         if (mStartMillis == Long.MAX_VALUE) {
             return Long.MAX_VALUE;
         } else {
-            return mStartMillis + mBucketDuration;
+            return mStartMillis + mBucketDurationMillis;
         }
     }
 
@@ -184,10 +185,10 @@
                 || time == SubscriptionPlan.TIME_UNKNOWN) {
             return time;
         } else {
-            final long mod = time % mBucketDuration;
+            final long mod = time % mBucketDurationMillis;
             if (mod > 0) {
                 time -= mod;
-                time += mBucketDuration;
+                time += mBucketDurationMillis;
             }
             return time;
         }
@@ -200,7 +201,7 @@
                 || time == SubscriptionPlan.TIME_UNKNOWN) {
             return time;
         } else {
-            final long mod = time % mBucketDuration;
+            final long mod = time % mBucketDurationMillis;
             if (mod > 0) {
                 time -= mod;
             }
@@ -247,10 +248,10 @@
         // 180 days of history should be enough for anyone; if we end up needing
         // more, we'll dynamically grow the history object.
         final int bucketEstimate = (int) NetworkStatsUtils.constrain(
-                ((end - start) / mBucketDuration), 0,
-                (180 * DateUtils.DAY_IN_MILLIS) / mBucketDuration);
+                ((end - start) / mBucketDurationMillis), 0,
+                (180 * DateUtils.DAY_IN_MILLIS) / mBucketDurationMillis);
         final NetworkStatsHistory combined = new NetworkStatsHistory(
-                mBucketDuration, bucketEstimate, fields);
+                mBucketDurationMillis, bucketEstimate, fields);
 
         // shortcut when we know stats will be empty
         if (start == end) return combined;
@@ -343,7 +344,7 @@
 
             // Finally we can slice data as originally requested
             final NetworkStatsHistory sliced = new NetworkStatsHistory(
-                    mBucketDuration, bucketEstimate, fields);
+                    mBucketDurationMillis, bucketEstimate, fields);
             sliced.recordHistory(combined, start, end);
             return sliced;
         } else {
@@ -458,9 +459,9 @@
         // update when no existing, or when bucket duration changed
         NetworkStatsHistory updated = null;
         if (existing == null) {
-            updated = new NetworkStatsHistory(mBucketDuration, 10);
-        } else if (existing.getBucketDuration() != mBucketDuration) {
-            updated = new NetworkStatsHistory(existing, mBucketDuration);
+            updated = new NetworkStatsHistory(mBucketDurationMillis, 10);
+        } else if (existing.getBucketDuration() != mBucketDurationMillis) {
+            updated = new NetworkStatsHistory(existing, mBucketDurationMillis);
         }
 
         if (updated != null) {
@@ -702,7 +703,7 @@
 
     private int estimateBuckets() {
         return (int) (Math.min(mEndMillis - mStartMillis, WEEK_IN_MILLIS * 5)
-                / mBucketDuration);
+                / mBucketDurationMillis);
     }
 
     private ArrayList<Key> getSortedKeys() {
@@ -828,7 +829,7 @@
      * Builder class for {@link NetworkStatsCollection}.
      */
     public static final class Builder {
-        private final long mBucketDuration;
+        private final long mBucketDurationMillis;
         private final ArrayMap<Key, NetworkStatsHistory> mEntries = new ArrayMap<>();
 
         /**
@@ -836,8 +837,8 @@
          *
          * @param bucketDuration Duration of the buckets of the object, in milliseconds.
          */
-        public Builder(long bucketDuration) {
-            mBucketDuration = bucketDuration;
+        public Builder(long bucketDurationMillis) {
+            mBucketDurationMillis = bucketDurationMillis;
         }
 
         /**
@@ -855,7 +856,7 @@
             final List<Entry> historyEntries = history.getEntries();
 
             final NetworkStatsHistory.Builder historyBuilder =
-                    new NetworkStatsHistory.Builder(mBucketDuration, historyEntries.size());
+                    new NetworkStatsHistory.Builder(mBucketDurationMillis, historyEntries.size());
             for (Entry entry : historyEntries) {
                 historyBuilder.addEntry(entry);
             }
@@ -871,7 +872,8 @@
          */
         @NonNull
         public NetworkStatsCollection build() {
-            final NetworkStatsCollection collection = new NetworkStatsCollection(mBucketDuration);
+            final NetworkStatsCollection collection =
+                    new NetworkStatsCollection(mBucketDurationMillis);
             for (int i = 0; i < mEntries.size(); i++) {
                 collection.recordHistory(mEntries.keyAt(i), mEntries.valueAt(i));
             }
@@ -883,7 +885,7 @@
      * the identifier that associate with the {@link NetworkStatsHistory} object to identify
      * a certain record in the {@link NetworkStatsCollection} object.
      */
-    public static class Key {
+    public static final class Key {
         /** @hide */
         public final NetworkIdentitySet ident;
         /** @hide */
@@ -903,7 +905,7 @@
          * @param set Set of the record, see {@code NetworkStats#SET_*}.
          * @param tag Tag of the record, see {@link TrafficStats#setThreadStatsTag(int)}.
          */
-        public Key(@NonNull Set<NetworkIdentity> ident, int uid, int set, int tag) {
+        public Key(@NonNull Set<NetworkIdentity> ident, int uid, @State int set, int tag) {
             this(new NetworkIdentitySet(Objects.requireNonNull(ident)), uid, set, tag);
         }
 
diff --git a/service-t/src/com/android/server/net/NetworkStatsService.java b/service-t/src/com/android/server/net/NetworkStatsService.java
index 72eff87..3db635b 100644
--- a/service-t/src/com/android/server/net/NetworkStatsService.java
+++ b/service-t/src/com/android/server/net/NetworkStatsService.java
@@ -565,7 +565,7 @@
                 return new BpfMap<U32, U8>(UID_COUNTERSET_MAP_PATH, BpfMap.BPF_F_RDWR,
                         U32.class, U8.class);
             } catch (ErrnoException e) {
-                Log.wtf(TAG, "Cannot create uid counter set map: " + e);
+                Log.wtf(TAG, "Cannot open uid counter set map: " + e);
                 return null;
             }
         }
@@ -576,7 +576,7 @@
                 return new BpfMap<CookieTagMapKey, CookieTagMapValue>(COOKIE_TAG_MAP_PATH,
                         BpfMap.BPF_F_RDWR, CookieTagMapKey.class, CookieTagMapValue.class);
             } catch (ErrnoException e) {
-                Log.wtf(TAG, "Cannot create cookie tag map: " + e);
+                Log.wtf(TAG, "Cannot open cookie tag map: " + e);
                 return null;
             }
         }
@@ -587,7 +587,7 @@
                 return new BpfMap<StatsMapKey, StatsMapValue>(STATS_MAP_A_PATH,
                         BpfMap.BPF_F_RDWR, StatsMapKey.class, StatsMapValue.class);
             } catch (ErrnoException e) {
-                Log.wtf(TAG, "Cannot create stats map A: " + e);
+                Log.wtf(TAG, "Cannot open stats map A: " + e);
                 return null;
             }
         }
@@ -598,7 +598,7 @@
                 return new BpfMap<StatsMapKey, StatsMapValue>(STATS_MAP_B_PATH,
                         BpfMap.BPF_F_RDWR, StatsMapKey.class, StatsMapValue.class);
             } catch (ErrnoException e) {
-                Log.wtf(TAG, "Cannot create stats map B: " + e);
+                Log.wtf(TAG, "Cannot open stats map B: " + e);
                 return null;
             }
         }
@@ -609,7 +609,7 @@
                 return new BpfMap<UidStatsMapKey, StatsMapValue>(APP_UID_STATS_MAP_PATH,
                         BpfMap.BPF_F_RDWR, UidStatsMapKey.class, StatsMapValue.class);
             } catch (ErrnoException e) {
-                Log.wtf(TAG, "Cannot create app uid stats map: " + e);
+                Log.wtf(TAG, "Cannot open app uid stats map: " + e);
                 return null;
             }
         }