[SP18] Poll network stats in OffloadController to support data warning am: a0ac6bca2e (469a3d4c) · Commits · e / os / android_frameworks_base

packages/Tethering/src/com/android/networkstack/tethering/OffloadController.java

+74 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@ import static android.net.NetworkStats.SET_DEFAULT;
		import static android.net.NetworkStats.TAG_NONE;
		import static android.net.NetworkStats.UID_ALL;
		import static android.net.NetworkStats.UID_TETHERING;
		import static android.net.netstats.provider.NetworkStatsProvider.QUOTA_UNLIMITED;
		import static android.provider.Settings.Global.TETHER_OFFLOAD_DISABLED;

		import android.annotation.NonNull;
		@@ -76,6 +77,7 @@ public class OffloadController {
		private static final boolean DBG = false;
		private static final String ANYIP = "0.0.0.0";
		private static final ForwardedStats EMPTY_STATS = new ForwardedStats();
		private static final int DEFAULT_PERFORM_POLL_INTERVAL_MS = 5000;

		@VisibleForTesting
		enum StatsType {
		@@ -115,6 +117,16 @@ public class OffloadController {
		// includes upstream interfaces that have a quota set.
		private HashMap<String, Long> mInterfaceQuotas = new HashMap<>();

		// Tracking remaining alert quota. Unlike limit quota is subject to interface, the alert
		// quota is interface independent and global for tether offload. Note that this is only
		// accessed on the handler thread and in the constructor.
		private long mRemainingAlertQuota = QUOTA_UNLIMITED;
		// Runnable that used to schedule the next stats poll.
		private final Runnable mScheduledPollingTask = () -> {
		updateStatsForCurrentUpstream();
		maybeSchedulePollingStats();
		};

		private int mNatUpdateCallbacksReceived;
		private int mNatUpdateNetlinkErrors;

		@@ -240,6 +252,7 @@ public class OffloadController {
		mLog.log("tethering offload started");
		mNatUpdateCallbacksReceived = 0;
		mNatUpdateNetlinkErrors = 0;
		maybeSchedulePollingStats();
		}
		return isStarted;
		}
		@@ -255,6 +268,9 @@ public class OffloadController {
		mHwInterface.stopOffloadControl();
		mControlInitialized = false;
		mConfigInitialized = false;
		if (mHandler.hasCallbacks(mScheduledPollingTask)) {
		mHandler.removeCallbacks(mScheduledPollingTask);
		}
		if (wasStarted) mLog.log("tethering offload stopped");
		}

		@@ -345,6 +361,11 @@ public class OffloadController {
		@Override
		public void onSetAlert(long quotaBytes) {
		// TODO: Ask offload HAL to notify alert without stopping traffic.
		// Post it to handler thread since it access remaining quota bytes.
		mHandler.post(() -> {
		updateAlertQuota(quotaBytes);
		maybeSchedulePollingStats();
		});
		}
		}

		@@ -366,15 +387,66 @@ public class OffloadController {
		// the stats for each interface, and does not observe partial writes where rxBytes is
		// updated and txBytes is not.
		ForwardedStats diff = mHwInterface.getForwardedStats(iface);
		final long usedAlertQuota = diff.rxBytes + diff.txBytes;
		ForwardedStats base = mForwardedStats.get(iface);
		if (base != null) {
		diff.add(base);
		}

		// Update remaining alert quota if it is still positive.
		if (mRemainingAlertQuota > 0 && usedAlertQuota > 0) {
		// Trim to zero if overshoot.
		final long newQuota = Math.max(mRemainingAlertQuota - usedAlertQuota, 0);
		updateAlertQuota(newQuota);
		}

		mForwardedStats.put(iface, diff);
		// diff is a new object, just created by getForwardedStats(). Therefore, anyone reading from
		// mForwardedStats (i.e., any caller of getTetherStats) will see the new stats immediately.
		}

		/**
		* Update remaining alert quota, fire the {@link NetworkStatsProvider#notifyAlertReached()}
		* callback when it reaches zero. This can be invoked either from service setting the alert, or
		* {@code maybeUpdateStats} when updating stats. Note that this can be only called on
		* handler thread.
		*
		* @param newQuota non-negative value to indicate the new quota, or
		* {@link NetworkStatsProvider#QUOTA_UNLIMITED} to indicate there is no
		* quota.
		*/
		private void updateAlertQuota(long newQuota) {
		if (newQuota < QUOTA_UNLIMITED) {
		throw new IllegalArgumentException("invalid quota value " + newQuota);
		}
		if (mRemainingAlertQuota == newQuota) return;

		mRemainingAlertQuota = newQuota;
		if (mRemainingAlertQuota == 0) {
		mLog.i("notifyAlertReached");
		if (mStatsProvider != null) mStatsProvider.notifyAlertReached();
		}
		}

		/**
		* Schedule polling if needed, this will be stopped if offload has been
		* stopped or remaining quota reaches zero or upstream is empty.
		* Note that this can be only called on handler thread.
		*/
		private void maybeSchedulePollingStats() {
		if (!isPollingStatsNeeded()) return;

		if (mHandler.hasCallbacks(mScheduledPollingTask)) {
		mHandler.removeCallbacks(mScheduledPollingTask);
		}
		mHandler.postDelayed(mScheduledPollingTask, DEFAULT_PERFORM_POLL_INTERVAL_MS);
		}

		private boolean isPollingStatsNeeded() {
		return started() && mRemainingAlertQuota > 0
		&& !TextUtils.isEmpty(currentUpstreamInterface());
		}

		private boolean maybeUpdateDataLimit(String iface) {
		// setDataLimit may only be called while offload is occurring on this upstream.
		if (!started() \|\| !TextUtils.equals(iface, currentUpstreamInterface())) {
		@@ -414,6 +486,8 @@ public class OffloadController {
		final String iface = currentUpstreamInterface();
		if (!TextUtils.isEmpty(iface)) mForwardedStats.putIfAbsent(iface, EMPTY_STATS);

		maybeSchedulePollingStats();

		// TODO: examine return code and decide what to do if programming
		// upstream parameters fails (probably just wait for a subsequent
		// onOffloadEvent() callback to tell us offload is available again and

packages/Tethering/src/com/android/networkstack/tethering/OffloadHardwareInterface.java

+0 −1

Original line number	Diff line number	Diff line
		@@ -308,7 +308,6 @@ public class OffloadHardwareInterface {
		return stats;
		}

		mLog.log(logmsg + YIELDS + stats);
		return stats;
		}