2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
9 package org.opendaylight.controller.protocol_plugin.openflow.core.internal;
11 import java.nio.channels.SelectionKey;
12 import java.nio.channels.Selector;
13 import java.nio.channels.SocketChannel;
14 import java.nio.channels.spi.SelectorProvider;
15 import java.util.ArrayList;
16 import java.util.Comparator;
17 import java.util.Date;
18 import java.util.HashMap;
19 import java.util.Iterator;
20 import java.util.List;
23 import java.util.Timer;
24 import java.util.TimerTask;
25 import java.util.concurrent.Callable;
26 import java.util.concurrent.ConcurrentHashMap;
27 import java.util.concurrent.ExecutorService;
28 import java.util.concurrent.Executors;
29 import java.util.concurrent.Future;
30 import java.util.concurrent.PriorityBlockingQueue;
31 import java.util.concurrent.RejectedExecutionException;
32 import java.util.concurrent.TimeUnit;
33 import java.util.concurrent.atomic.AtomicInteger;
35 import org.opendaylight.controller.protocol_plugin.openflow.core.IController;
36 import org.opendaylight.controller.protocol_plugin.openflow.core.IMessageReadWrite;
37 import org.opendaylight.controller.protocol_plugin.openflow.core.ISwitch;
38 import org.openflow.protocol.OFBarrierReply;
39 import org.openflow.protocol.OFBarrierRequest;
40 import org.openflow.protocol.OFEchoReply;
41 import org.openflow.protocol.OFError;
42 import org.openflow.protocol.OFFeaturesReply;
43 import org.openflow.protocol.OFFlowMod;
44 import org.openflow.protocol.OFGetConfigReply;
45 import org.openflow.protocol.OFMatch;
46 import org.openflow.protocol.OFMessage;
47 import org.openflow.protocol.OFPhysicalPort;
48 import org.openflow.protocol.OFPhysicalPort.OFPortConfig;
49 import org.openflow.protocol.OFPhysicalPort.OFPortFeatures;
50 import org.openflow.protocol.OFPhysicalPort.OFPortState;
51 import org.openflow.protocol.OFPort;
52 import org.openflow.protocol.OFPortStatus;
53 import org.openflow.protocol.OFPortStatus.OFPortReason;
54 import org.openflow.protocol.OFSetConfig;
55 import org.openflow.protocol.OFStatisticsReply;
56 import org.openflow.protocol.OFStatisticsRequest;
57 import org.openflow.protocol.OFType;
58 import org.openflow.protocol.factory.BasicFactory;
59 import org.openflow.util.HexString;
60 import org.slf4j.Logger;
61 import org.slf4j.LoggerFactory;
63 public class SwitchHandler implements ISwitch {
64 private static final Logger logger = LoggerFactory.getLogger(SwitchHandler.class);
65 private static final int SWITCH_LIVENESS_TIMER = 5000;
66 private static final int switchLivenessTimeout = getSwitchLivenessTimeout();
67 private final int MESSAGE_RESPONSE_TIMER = 2000;
69 private final String instanceName;
70 private final ISwitch thisISwitch;
71 private final IController core;
73 private Integer buffers;
74 private Integer capabilities;
76 private Integer actions;
77 private Selector selector;
78 private final SocketChannel socket;
79 private final BasicFactory factory;
80 private final AtomicInteger xid;
81 private SwitchState state;
82 private Timer periodicTimer;
83 private final Map<Short, OFPhysicalPort> physicalPorts;
84 private final Map<Short, Integer> portBandwidth;
85 private final Date connectedDate;
86 private Long lastMsgReceivedTimeStamp;
87 private Boolean probeSent;
88 private final ExecutorService executor;
89 private final ConcurrentHashMap<Integer, Callable<Object>> messageWaitingDone;
90 private boolean running;
91 private IMessageReadWrite msgReadWriteService;
92 private Thread switchHandlerThread;
93 private Integer responseTimerValue;
94 private PriorityBlockingQueue<PriorityMessage> transmitQ;
95 private Thread transmitThread;
97 private enum SwitchState {
98 NON_OPERATIONAL(0), WAIT_FEATURES_REPLY(1), WAIT_CONFIG_REPLY(2), OPERATIONAL(3);
102 private SwitchState(int value) {
106 @SuppressWarnings("unused")
112 public SwitchHandler(Controller core, SocketChannel sc, String name) {
113 this.instanceName = name;
114 this.thisISwitch = this;
116 this.buffers = (int) 0;
117 this.capabilities = (int) 0;
118 this.tables = (byte) 0;
119 this.actions = (int) 0;
122 this.factory = new BasicFactory();
123 this.connectedDate = new Date();
124 this.lastMsgReceivedTimeStamp = connectedDate.getTime();
125 this.physicalPorts = new HashMap<Short, OFPhysicalPort>();
126 this.portBandwidth = new HashMap<Short, Integer>();
127 this.state = SwitchState.NON_OPERATIONAL;
128 this.probeSent = false;
129 this.xid = new AtomicInteger(this.socket.hashCode());
130 this.periodicTimer = null;
131 this.executor = Executors.newFixedThreadPool(4);
132 this.messageWaitingDone = new ConcurrentHashMap<Integer, Callable<Object>>();
133 this.responseTimerValue = MESSAGE_RESPONSE_TIMER;
134 String rTimer = System.getProperty("of.messageResponseTimer");
135 if (rTimer != null) {
137 responseTimerValue = Integer.decode(rTimer);
138 } catch (NumberFormatException e) {
139 logger.warn("Invalid of.messageResponseTimer: {} use default({})", rTimer, MESSAGE_RESPONSE_TIMER);
144 public void start() {
146 startTransmitThread();
149 startHandlerThread();
150 } catch (Exception e) {
155 private void startHandlerThread() {
156 switchHandlerThread = new Thread(new Runnable() {
162 // wait for an incoming connection
164 Iterator<SelectionKey> selectedKeys = selector.selectedKeys().iterator();
165 while (selectedKeys.hasNext()) {
166 SelectionKey skey = selectedKeys.next();
167 selectedKeys.remove();
168 if (skey.isValid() && skey.isWritable()) {
171 if (skey.isValid() && skey.isReadable()) {
175 } catch (Exception e) {
181 switchHandlerThread.start();
184 private void stopInternal() {
185 logger.debug("{} receives stop signal",
186 (isOperational() ? HexString.toHexString(sid) : "unknown"));
192 } catch (Exception e) {
196 } catch (Exception e) {
199 msgReadWriteService.stop();
200 } catch (Exception e) {
202 logger.debug("executor shutdown now");
203 executor.shutdownNow();
205 msgReadWriteService = null;
211 if (switchHandlerThread != null) {
212 switchHandlerThread.interrupt();
214 if (transmitThread != null) {
215 transmitThread.interrupt();
220 public int getNextXid() {
221 return this.xid.incrementAndGet();
225 * This method puts the message in an outgoing priority queue with normal
226 * priority. It will be served after high priority messages. The method
227 * should be used for non-critical messages such as statistics request,
228 * discovery packets, etc. An unique XID is generated automatically and
229 * inserted into the message.
232 * The OF message to be sent
233 * @return The XID used
236 public Integer asyncSend(OFMessage msg) {
237 return asyncSend(msg, getNextXid());
240 private Object syncSend(OFMessage msg, int xid) {
241 return syncMessageInternal(msg, xid, true);
245 * This method puts the message in an outgoing priority queue with normal
246 * priority. It will be served after high priority messages. The method
247 * should be used for non-critical messages such as statistics request,
248 * discovery packets, etc. The specified XID is inserted into the message.
251 * The OF message to be Sent
253 * The XID to be used in the message
254 * @return The XID used
257 public Integer asyncSend(OFMessage msg, int xid) {
259 if (transmitQ != null) {
260 transmitQ.add(new PriorityMessage(msg, 0));
266 * This method puts the message in an outgoing priority queue with high
267 * priority. It will be served first before normal priority messages. The
268 * method should be used for critical messages such as hello, echo reply
269 * etc. An unique XID is generated automatically and inserted into the
273 * The OF message to be sent
274 * @return The XID used
277 public Integer asyncFastSend(OFMessage msg) {
278 return asyncFastSend(msg, getNextXid());
282 * This method puts the message in an outgoing priority queue with high
283 * priority. It will be served first before normal priority messages. The
284 * method should be used for critical messages such as hello, echo reply
285 * etc. The specified XID is inserted into the message.
288 * The OF message to be sent
289 * @return The XID used
292 public Integer asyncFastSend(OFMessage msg, int xid) {
294 if (transmitQ != null) {
295 transmitQ.add(new PriorityMessage(msg, 1));
300 public void resumeSend() {
302 if (msgReadWriteService != null) {
303 msgReadWriteService.resumeSend();
305 } catch (Exception e) {
311 * This method bypasses the transmit queue and sends the message over the
312 * socket directly. If the input xid is not null, the specified xid is
313 * inserted into the message. Otherwise, an unique xid is generated
314 * automatically and inserted into the message.
321 private void asyncSendNow(OFMessage msg, Integer xid) {
331 * This method bypasses the transmit queue and sends the message over the
337 private void asyncSendNow(OFMessage msg) {
338 if (msgReadWriteService == null) {
339 logger.warn("asyncSendNow: {} is not sent because Message ReadWrite Service is not available.", msg);
344 msgReadWriteService.asyncSend(msg);
345 } catch (Exception e) {
350 public void handleMessages() {
351 List<OFMessage> msgs = null;
354 if (msgReadWriteService != null) {
355 msgs = msgReadWriteService.readMessages();
357 } catch (Exception e) {
364 for (OFMessage msg : msgs) {
365 logger.trace("Message received: {}", msg);
366 this.lastMsgReceivedTimeStamp = System.currentTimeMillis();
367 OFType type = msg.getType();
370 sendFeaturesRequest();
373 OFEchoReply echoReply = (OFEchoReply) factory.getMessage(OFType.ECHO_REPLY);
374 // respond immediately
375 asyncSendNow(echoReply, msg.getXid());
377 // send features request if not sent yet
378 sendFeaturesRequest();
381 this.probeSent = false;
384 processFeaturesReply((OFFeaturesReply) msg);
386 case GET_CONFIG_REPLY:
387 // make sure that the switch can send the whole packet to the
389 if (((OFGetConfigReply) msg).getMissSendLength() == (short) 0xffff) {
390 this.state = SwitchState.OPERATIONAL;
394 processBarrierReply((OFBarrierReply) msg);
397 processErrorReply((OFError) msg);
400 processPortStatusMsg((OFPortStatus) msg);
403 processStatsReply((OFStatisticsReply) msg);
410 if (isOperational()) {
411 ((Controller) core).takeSwitchEventMsg(thisISwitch, msg);
416 private void processPortStatusMsg(OFPortStatus msg) {
417 OFPhysicalPort port = msg.getDesc();
418 if (msg.getReason() == (byte) OFPortReason.OFPPR_MODIFY.ordinal()) {
419 updatePhysicalPort(port);
420 } else if (msg.getReason() == (byte) OFPortReason.OFPPR_ADD.ordinal()) {
421 updatePhysicalPort(port);
422 } else if (msg.getReason() == (byte) OFPortReason.OFPPR_DELETE.ordinal()) {
423 deletePhysicalPort(port);
428 private void startSwitchTimer() {
429 this.periodicTimer = new Timer();
430 this.periodicTimer.scheduleAtFixedRate(new TimerTask() {
434 Long now = System.currentTimeMillis();
435 if ((now - lastMsgReceivedTimeStamp) > switchLivenessTimeout) {
437 // switch failed to respond to our probe, consider
439 logger.warn("{} sid {} is idle for too long, disconnect", socket.socket()
440 .getRemoteSocketAddress().toString().split("/")[1], (sid == 0) ? "unknown"
441 : HexString.toHexString(sid));
442 reportSwitchStateChange(false);
444 // send a probe to see if the switch is still alive
445 logger.debug("Send idle probe (Echo Request) to {}", this);
447 OFMessage echo = factory.getMessage(OFType.ECHO_REQUEST);
451 if (state == SwitchState.WAIT_FEATURES_REPLY) {
452 // send another features request
453 OFMessage request = factory.getMessage(OFType.FEATURES_REQUEST);
454 asyncFastSend(request);
456 if (state == SwitchState.WAIT_CONFIG_REPLY) {
457 // send another config request
458 OFSetConfig config = (OFSetConfig) factory.getMessage(OFType.SET_CONFIG);
459 config.setMissSendLength((short) 0xffff).setLengthU(OFSetConfig.MINIMUM_LENGTH);
460 asyncFastSend(config);
461 OFMessage getConfig = factory.getMessage(OFType.GET_CONFIG_REQUEST);
462 asyncFastSend(getConfig);
466 } catch (Exception e) {
470 }, SWITCH_LIVENESS_TIMER, SWITCH_LIVENESS_TIMER);
473 private void cancelSwitchTimer() {
474 if (this.periodicTimer != null) {
475 this.periodicTimer.cancel();
479 private void reportError(Exception e) {
481 logger.debug("Caught exception {} while switch {} is shutting down. Skip", e.getMessage(),
482 (isOperational() ? HexString.toHexString(sid) : "unknown"));
485 logger.debug("Caught exception: ", e);
487 // notify core of this error event and disconnect the switch
488 ((Controller) core).takeSwitchEventError(this);
490 // clean up some internal states immediately
494 private void reportSwitchStateChange(boolean added) {
496 ((Controller) core).takeSwitchEventAdd(this);
498 ((Controller) core).takeSwitchEventDelete(this);
503 public Long getId() {
507 private void sendFeaturesRequest() {
508 if (!isOperational() && (this.state != SwitchState.WAIT_FEATURES_REPLY)) {
509 // send feature request
510 OFMessage featureRequest = factory.getMessage(OFType.FEATURES_REQUEST);
511 asyncFastSend(featureRequest);
512 this.state = SwitchState.WAIT_FEATURES_REPLY;
517 private void processFeaturesReply(OFFeaturesReply reply) {
518 if (this.state == SwitchState.WAIT_FEATURES_REPLY) {
519 this.sid = reply.getDatapathId();
520 this.buffers = reply.getBuffers();
521 this.capabilities = reply.getCapabilities();
522 this.tables = reply.getTables();
523 this.actions = reply.getActions();
524 // notify core of this error event
525 for (OFPhysicalPort port : reply.getPorts()) {
526 updatePhysicalPort(port);
528 // config the switch to send full data packet
529 OFSetConfig config = (OFSetConfig) factory.getMessage(OFType.SET_CONFIG);
530 config.setMissSendLength((short) 0xffff).setLengthU(OFSetConfig.MINIMUM_LENGTH);
531 asyncFastSend(config);
532 // send config request to make sure the switch can handle the set
534 OFMessage getConfig = factory.getMessage(OFType.GET_CONFIG_REQUEST);
535 asyncFastSend(getConfig);
536 this.state = SwitchState.WAIT_CONFIG_REPLY;
537 // inform core that a new switch is now operational
538 reportSwitchStateChange(true);
542 private void updatePhysicalPort(OFPhysicalPort port) {
543 Short portNumber = port.getPortNumber();
544 physicalPorts.put(portNumber, port);
547 port.getCurrentFeatures()
548 & (OFPortFeatures.OFPPF_10MB_FD.getValue() | OFPortFeatures.OFPPF_10MB_HD.getValue()
549 | OFPortFeatures.OFPPF_100MB_FD.getValue()
550 | OFPortFeatures.OFPPF_100MB_HD.getValue()
551 | OFPortFeatures.OFPPF_1GB_FD.getValue()
552 | OFPortFeatures.OFPPF_1GB_HD.getValue() | OFPortFeatures.OFPPF_10GB_FD
556 private void deletePhysicalPort(OFPhysicalPort port) {
557 Short portNumber = port.getPortNumber();
558 physicalPorts.remove(portNumber);
559 portBandwidth.remove(portNumber);
563 public boolean isOperational() {
564 return ((this.state == SwitchState.WAIT_CONFIG_REPLY) || (this.state == SwitchState.OPERATIONAL));
568 public String toString() {
570 return ("Switch:" + socket.socket().getRemoteSocketAddress().toString().split("/")[1] + " SWID:" + (isOperational() ? HexString
571 .toHexString(this.sid) : "unknown"));
572 } catch (Exception e) {
573 return (isOperational() ? HexString.toHexString(this.sid) : "unknown");
579 public Date getConnectedDate() {
580 return this.connectedDate;
583 public String getInstanceName() {
588 public Object getStatistics(OFStatisticsRequest req) {
589 int xid = getNextXid();
590 StatisticsCollector worker = new StatisticsCollector(this, xid, req);
591 messageWaitingDone.put(xid, worker);
592 Future<Object> submit;
593 Object result = null;
595 submit = executor.submit(worker);
596 } catch (RejectedExecutionException re) {
597 messageWaitingDone.remove(xid);
601 result = submit.get(responseTimerValue, TimeUnit.MILLISECONDS);
603 } catch (Exception e) {
604 logger.warn("Timeout while waiting for {} replies from {}",
605 req.getType(), (isOperational() ? HexString.toHexString(sid) : "unknown"));
606 result = null; // to indicate timeout has occurred
613 public Object syncSend(OFMessage msg) {
615 logger.debug("Switch is going down, ignore syncSend");
618 int xid = getNextXid();
619 return syncSend(msg, xid);
623 * Either a BarrierReply or a OFError is received. If this is a reply for an
624 * outstanding sync message, wake up associated task so that it can continue
626 private void processBarrierReply(OFBarrierReply msg) {
627 Integer xid = msg.getXid();
628 SynchronousMessage worker = (SynchronousMessage) messageWaitingDone.remove(xid);
629 if (worker == null) {
635 private void processErrorReply(OFError errorMsg) {
636 OFMessage offendingMsg = errorMsg.getOffendingMsg();
638 if (offendingMsg != null) {
639 xid = offendingMsg.getXid();
641 xid = errorMsg.getXid();
644 * the error can be a reply to a synchronous message or to a statistic
647 Callable<?> worker = messageWaitingDone.remove(xid);
648 if (worker == null) {
651 if (worker instanceof SynchronousMessage) {
652 ((SynchronousMessage) worker).wakeup(errorMsg);
654 ((StatisticsCollector) worker).wakeup(errorMsg);
658 private void processStatsReply(OFStatisticsReply reply) {
659 Integer xid = reply.getXid();
660 StatisticsCollector worker = (StatisticsCollector) messageWaitingDone.get(xid);
661 if (worker == null) {
664 if (worker.collect(reply)) {
665 // if all the stats records are received (collect() returns true)
667 messageWaitingDone.remove(xid);
673 public Map<Short, OFPhysicalPort> getPhysicalPorts() {
674 return this.physicalPorts;
678 public OFPhysicalPort getPhysicalPort(Short portNumber) {
679 return this.physicalPorts.get(portNumber);
683 public Integer getPortBandwidth(Short portNumber) {
684 return this.portBandwidth.get(portNumber);
688 public Set<Short> getPorts() {
689 return this.physicalPorts.keySet();
693 public Byte getTables() {
698 public Integer getActions() {
703 public Integer getCapabilities() {
704 return this.capabilities;
708 public Integer getBuffers() {
713 public boolean isPortEnabled(short portNumber) {
714 return isPortEnabled(physicalPorts.get(portNumber));
718 public boolean isPortEnabled(OFPhysicalPort port) {
722 int portConfig = port.getConfig();
723 int portState = port.getState();
724 if ((portConfig & OFPortConfig.OFPPC_PORT_DOWN.getValue()) > 0) {
727 if ((portState & OFPortState.OFPPS_LINK_DOWN.getValue()) > 0) {
730 if ((portState & OFPortState.OFPPS_STP_MASK.getValue()) == OFPortState.OFPPS_STP_BLOCK.getValue()) {
737 public List<OFPhysicalPort> getEnabledPorts() {
738 List<OFPhysicalPort> result = new ArrayList<OFPhysicalPort>();
739 synchronized (this.physicalPorts) {
740 for (OFPhysicalPort port : physicalPorts.values()) {
741 if (isPortEnabled(port)) {
750 * Transmit thread polls the message out of the priority queue and invokes
751 * messaging service to transmit it over the socket channel
753 class PriorityMessageTransmit implements Runnable {
759 PriorityMessage pmsg = transmitQ.take();
760 msgReadWriteService.asyncSend(pmsg.msg);
762 * If syncReply is set to true, wait for the response back.
764 if (pmsg.syncReply) {
765 syncMessageInternal(pmsg.msg, pmsg.msg.getXid(), false);
767 } catch (InterruptedException ie) {
768 reportError(new InterruptedException("PriorityMessageTransmit thread interrupted"));
769 } catch (Exception e) {
778 * Setup and start the transmit thread
780 private void startTransmitThread() {
781 this.transmitQ = new PriorityBlockingQueue<PriorityMessage>(11, new Comparator<PriorityMessage>() {
783 public int compare(PriorityMessage p1, PriorityMessage p2) {
784 if (p2.priority != p1.priority) {
785 return p2.priority - p1.priority;
787 return (p2.seqNum < p1.seqNum) ? 1 : -1;
791 this.transmitThread = new Thread(new PriorityMessageTransmit());
792 this.transmitThread.start();
796 * Setup communication services
798 private void setupCommChannel() throws Exception {
799 this.selector = SelectorProvider.provider().openSelector();
800 this.socket.configureBlocking(false);
801 this.socket.socket().setTcpNoDelay(true);
802 this.msgReadWriteService = getMessageReadWriteService();
805 private void sendFirstHello() {
807 OFMessage msg = factory.getMessage(OFType.HELLO);
809 } catch (Exception e) {
814 private IMessageReadWrite getMessageReadWriteService() throws Exception {
815 String str = System.getProperty("secureChannelEnabled");
816 return ((str != null) && (str.trim().equalsIgnoreCase("true"))) ? new SecureMessageReadWriteService(socket,
817 selector) : new MessageReadWriteService(socket, selector);
821 * Send Barrier message synchronously. The caller will be blocked until the
822 * Barrier reply is received.
825 public Object syncSendBarrierMessage() {
826 OFBarrierRequest barrierMsg = new OFBarrierRequest();
827 return syncSend(barrierMsg);
831 * Send Barrier message asynchronously. The caller is not blocked. The
832 * Barrier message will be sent in a transmit thread which will be blocked
833 * until the Barrier reply is received.
836 public Object asyncSendBarrierMessage() {
837 if (transmitQ == null) {
838 return Boolean.FALSE;
841 OFBarrierRequest barrierMsg = new OFBarrierRequest();
842 int xid = getNextXid();
844 barrierMsg.setXid(xid);
845 transmitQ.add(new PriorityMessage(barrierMsg, 0, true));
851 * This method returns the switch liveness timeout value. If controller did
852 * not receive any message from the switch for such a long period,
853 * controller will tear down the connection to the switch.
855 * @return The timeout value
857 private static int getSwitchLivenessTimeout() {
858 String timeout = System.getProperty("of.switchLivenessTimeout");
862 if (timeout != null) {
863 rv = Integer.parseInt(timeout);
865 } catch (Exception e) {
872 * This method performs synchronous operations for a given message. If
873 * syncRequest is set to true, the message will be sent out followed by a
874 * Barrier request message. Then it's blocked until the Barrier rely arrives
875 * or timeout. If syncRequest is false, it simply skips the message send and
876 * just waits for the response back.
883 * If set to true, the message the message will be sent out
884 * followed by a Barrier request message. If set to false, it
885 * simply skips the sending and just waits for the Barrier reply.
888 private Object syncMessageInternal(OFMessage msg, int xid, boolean syncRequest) {
889 SynchronousMessage worker = new SynchronousMessage(this, xid, msg, syncRequest);
890 messageWaitingDone.put(xid, worker);
891 Object result = null;
892 Boolean status = false;
893 Future<Object> submit;
895 submit = executor.submit(worker);
896 } catch (RejectedExecutionException re) {
897 messageWaitingDone.remove(xid);
901 result = submit.get(responseTimerValue, TimeUnit.MILLISECONDS);
902 messageWaitingDone.remove(xid);
903 if (result == null) {
904 // if result is null, then it means the switch can handle this
905 // message successfully
906 // convert the result into a Boolean with value true
908 // logger.debug("Successfully send " +
909 // msg.getType().toString());
912 // if result is not null, this means the switch can't handle
914 // the result if OFError already
915 if (logger.isDebugEnabled()) {
916 logger.debug("Send {} failed --> {}", msg.getType(), (result));
920 } catch (Exception e) {
921 logger.warn("Timeout while waiting for {} reply", msg.getType().toString());
922 // convert the result into a Boolean with value false
931 public void deleteAllFlows() {
932 logger.trace("deleteAllFlows on switch {}", HexString.toHexString(this.sid));
933 OFMatch match = new OFMatch().setWildcards(OFMatch.OFPFW_ALL);
934 OFFlowMod flowMod = (OFFlowMod) factory.getMessage(OFType.FLOW_MOD);
935 flowMod.setMatch(match).setCommand(OFFlowMod.OFPFC_DELETE).setOutPort(OFPort.OFPP_NONE)
936 .setLength((short) OFFlowMod.MINIMUM_LENGTH);
937 asyncFastSend(flowMod);