import java.util.List;
import java.util.Map;
import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
+import java.util.Timer;
+import java.util.TimerTask;
import org.opendaylight.controller.clustering.services.CacheConfigException;
import org.opendaylight.controller.clustering.services.CacheExistException;
private ISwitchManager switchManager;
private IDataPacketService dataPacketService;
+ /**
+ * Ip packets that are punted may not have their destination known by hostTracker at the time it
+ * is presented to SimpleForwardingImpl. Instead of dropping the packet, we will keep it around
+ * for a 'little' while, to accommodate any transients. See bug 590 for more details.
+ */
+ private class PendingPacketData {
+ private final static byte MAX_AGE = 2;
+
+ public final IPv4 pkt;
+ public final NodeConnector incomingNodeConnector;
+ private byte age;
+
+ public PendingPacketData(IPv4 pkt, NodeConnector incomingNodeConnector) {
+ this.pkt = pkt;
+ this.incomingNodeConnector = incomingNodeConnector;
+ this.age = 0;
+ }
+ boolean bumpAgeAndCheckIfTooOld() { return ++age > MAX_AGE; }
+ }
+ private static final int MAX_PENDING_PACKET_DESTINATIONS = 64;
+ private ConcurrentMap<InetAddress, PendingPacketData> pendingPacketDestinations;
+ private Timer pendingPacketsAgerTimer;
+
+ private class PendingPacketsAgerTimerHandler extends TimerTask {
+ @Override
+ public void run() {
+ if (pendingPacketDestinations == null) {
+ return;
+ }
+ try {
+ Iterator<ConcurrentMap.Entry<InetAddress, PendingPacketData>> iterator =
+ pendingPacketDestinations.entrySet().iterator();
+ while (iterator.hasNext()) {
+ ConcurrentHashMap.Entry<InetAddress, PendingPacketData> entry = iterator.next();
+ InetAddress dIP = entry.getKey();
+ PendingPacketData pendingPacketData = entry.getValue();
+
+ if (pendingPacketData.bumpAgeAndCheckIfTooOld()) {
+ iterator.remove(); // safe to remove while iterating...
+ log.debug("Pending packet for {} has been aged out", dIP);
+ } else {
+ /** Replace the entry for a key only if currently mapped to some value.
+ * This will protect the concurrent map against a race where this thread
+ * would be re-adding an entry that just got taken out.
+ */
+ pendingPacketDestinations.replace(dIP, pendingPacketData);
+ }
+ }
+ } catch (IllegalStateException e) {
+ log.warn("IllegalStateException Received by PendingPacketsAgerTimerHandler from: {}",
+ e.getMessage());
+ }
+ }
+ }
+
+ /**
+ * Add punted packet to pendingPackets
+ */
+ private void addToPendingPackets(InetAddress dIP, IPv4 pkt, NodeConnector incomingNodeConnector) {
+ if (pendingPacketDestinations.size() >= MAX_PENDING_PACKET_DESTINATIONS) {
+ log.info("Will not pend packet for {}: Too many destinations", dIP);
+ return;
+ }
+
+ /** TODO: The current implementation allows for up to 1 pending packet per InetAddress.
+ * This limitation is done for sake of simplicity. A potential enhancement could be to use a
+ * ConcurrentMultiMap instead of ConcurrentMap.
+ */
+ if (pendingPacketDestinations.containsKey(dIP)) {
+ log.trace("Will not pend packet for {}: Already have a packet pending", dIP);
+ return;
+ }
+
+ PendingPacketData pendingPacketData = new PendingPacketData(pkt, incomingNodeConnector);
+ pendingPacketDestinations.put(dIP, pendingPacketData);
+ log.debug("Pending packet for {}", dIP);
+ }
+
+ /**
+ * Send punted packet to given destination. This is invoked when there is a certain level of
+ * hope that the destination is known by hostTracker.
+ */
+ private void sendPendingPacket(InetAddress dIP) {
+ PendingPacketData pendingPacketData = pendingPacketDestinations.get(dIP);
+ if (pendingPacketData != null) {
+ handlePuntedIPPacket(pendingPacketData.pkt, pendingPacketData.incomingNodeConnector, false);
+ log.trace("Packet for {} is no longer pending", dIP);
+ pendingPacketDestinations.remove(dIP);
+ }
+ }
+
/**
* Return codes from the programming of the perHost rules in HW
*/
public void startUp() {
allocateCaches();
retrieveCaches();
+ nonClusterObjectCreate();
+ }
+
+ public void nonClusterObjectCreate() {
+ pendingPacketDestinations = new ConcurrentHashMap<InetAddress, PendingPacketData>();
+
+ /* Pending Packets Ager Timer to go off every 6 seconds to implement pending packet aging */
+ pendingPacketsAgerTimer = new Timer();
+ pendingPacketsAgerTimer.schedule(new PendingPacketsAgerTimerHandler(), 6000, 6000);
}
/**
Set<Node> switches = preparePerHostRules(host);
if (switches != null) {
installPerHostRules(host, switches);
+
+ // Green light for sending pending packet to this host. Safe to call if there are none.
+ sendPendingPacket(host.getNetworkAddress());
}
}
*
*/
void stop() {
+ pendingPacketsAgerTimer.cancel();
+ pendingPacketDestinations.clear();
}
public void setSwitchManager(ISwitchManager switchManager) {
Object nextPak = formattedPak.getPayload();
if (nextPak instanceof IPv4) {
log.trace("Handle punted IP packet: {}", formattedPak);
- handlePuntedIPPacket((IPv4) nextPak, inPkt.getIncomingNodeConnector());
+ handlePuntedIPPacket((IPv4) nextPak, inPkt.getIncomingNodeConnector(), true);
}
}
return PacketResult.IGNORED;
}
- private void handlePuntedIPPacket(IPv4 pkt, NodeConnector incomingNodeConnector) {
+ private void handlePuntedIPPacket(IPv4 pkt, NodeConnector incomingNodeConnector, boolean allowAddPending) {
InetAddress dIP = NetUtils.getInetAddress(pkt.getDestinationAddress());
if (dIP == null || hostTracker == null) {
log.debug("Invalid param(s) in handlePuntedIPPacket.. DestIP: {}. hostTracker: {}", dIP, hostTracker);
rp.setOutgoingNodeConnector(nc);
this.dataPacketService.transmitDataPacket(rp);
}
-
+ } else if (allowAddPending) {
+ // If we made it here, let's hang on to the punted packet, with hopes that its destination
+ // will become available soon.
+ addToPendingPackets(dIP, pkt, incomingNodeConnector);
+ } else {
+ log.warn("Dropping punted IP packet received at {} to Host {}", incomingNodeConnector, dIP);
}
}
}
Code Review / controller.git / blobdiff