From 6c0840352d206176ddbe3e4b60c44fd2cbf5bc98 Mon Sep 17 00:00:00 2001
From: Stefano Avallone <stavallo@unina.it>
Date: Sun, 28 May 2017 10:21:32 +0200
Subject: [PATCH] traffic-control: Add the mq queue disc

---
 CHANGES.html                                  |   2 +
 doc/models/Makefile                           |   1 +
 doc/models/source/traffic-control.rst         |   1 +
 .../ns3wifi/wifi-ac-mapping-test-suite.cc     | 117 ++++++++++++++----
 src/traffic-control/doc/mq.rst                |  83 +++++++++++++
 src/traffic-control/model/mq-queue-disc.cc    | 101 +++++++++++++++
 src/traffic-control/model/mq-queue-disc.h     |  66 ++++++++++
 src/traffic-control/wscript                   |   2 +
 8 files changed, 346 insertions(+), 27 deletions(-)
 create mode 100644 src/traffic-control/doc/mq.rst
 create mode 100644 src/traffic-control/model/mq-queue-disc.cc
 create mode 100644 src/traffic-control/model/mq-queue-disc.h

diff --git a/CHANGES.html b/CHANGES.html
index d2e74c9a8..b2e1000d5 100644
--- a/CHANGES.html
+++ b/CHANGES.html
@@ -93,6 +93,8 @@ us a note on ns-developers mailing list.</p>
     which returns a vector of pairs (dscp,count), each of which indicates how many packets with the
     associated dscp value have been classified for a given flow.
 </li>
+<li>MqQueueDisc, a multi-queue aware queue disc modelled after the mq qdisc in Linux, has been introduced.
+</li>
 </ul>
 <h2>Changes to existing API:</h2>
 <ul>
diff --git a/doc/models/Makefile b/doc/models/Makefile
index 405a08b82..066bdf15b 100644
--- a/doc/models/Makefile
+++ b/doc/models/Makefile
@@ -83,6 +83,7 @@ SOURCES = \
 	$(SRC)/traffic-control/doc/codel.rst \
 	$(SRC)/traffic-control/doc/fq-codel.rst \
 	$(SRC)/traffic-control/doc/pie.rst \
+	$(SRC)/traffic-control/doc/mq.rst \
 	$(SRC)/spectrum/doc/spectrum.rst \
 	$(SRC)/stats/doc/adaptor.rst \
 	$(SRC)/stats/doc/aggregator.rst \
diff --git a/doc/models/source/traffic-control.rst b/doc/models/source/traffic-control.rst
index fe5562513..1a6dddea0 100644
--- a/doc/models/source/traffic-control.rst
+++ b/doc/models/source/traffic-control.rst
@@ -10,3 +10,4 @@ Traffic Control Layer
    codel
    fq-codel
    pie
+   mq
diff --git a/src/test/ns3wifi/wifi-ac-mapping-test-suite.cc b/src/test/ns3wifi/wifi-ac-mapping-test-suite.cc
index 990c914de..02e113be7 100644
--- a/src/test/ns3wifi/wifi-ac-mapping-test-suite.cc
+++ b/src/test/ns3wifi/wifi-ac-mapping-test-suite.cc
@@ -41,6 +41,9 @@
 #include "ns3/ipv4-address-helper.h"
 #include "ns3/packet-sink-helper.h"
 #include "ns3/on-off-helper.h"
+#include "ns3/traffic-control-helper.h"
+#include "ns3/traffic-control-layer.h"
+#include "ns3/llc-snap-header.h"
 
 using namespace ns3;
 
@@ -53,15 +56,54 @@ public:
   virtual void DoRun (void);
 
 private:
+  static void PacketEnqueuedInQueueDisc (uint8_t tos, uint8_t* count, Ptr<const QueueDiscItem> item);
+  static void PacketEnqueuedInWifiMacQueue (uint8_t tos, uint8_t* count, Ptr<const WifiMacQueueItem> item);
   uint8_t m_tos;
   uint8_t m_expectedQueue;
+  uint8_t m_QueueDiscCount[4];
+  uint8_t m_WifiMacQueueCount[4];
 };
 
 WifiAcMappingTest::WifiAcMappingTest (uint8_t tos, uint8_t expectedQueue)
-  : TestCase ("User priority to Access Category mapping test"),
+  : TestCase ("User priority to Access Category mapping test. Checks that packets are"
+              "enqueued in the correct child queue disc of the mq root queue disc and"
+              "in the correct wifi MAC queue"),
     m_tos (tos),
     m_expectedQueue (expectedQueue)
 {
+  for (uint8_t i = 0; i < 4; i++)
+    {
+      m_QueueDiscCount[i] = 0;
+      m_WifiMacQueueCount[i] = 0;
+    }
+}
+
+void
+WifiAcMappingTest::PacketEnqueuedInQueueDisc (uint8_t tos, uint8_t* count, Ptr<const QueueDiscItem> item)
+{
+  uint8_t val;
+  if (item->GetUint8Value (QueueItem::IP_DSFIELD, val) && val == tos)
+    {
+      (*count)++;
+    }
+}
+
+void
+WifiAcMappingTest::PacketEnqueuedInWifiMacQueue (uint8_t tos, uint8_t* count, Ptr<const WifiMacQueueItem> item)
+{
+  LlcSnapHeader llc;
+  Ptr<Packet> packet = item->GetPacket ()->Copy ();
+  packet->RemoveHeader (llc);
+
+  if (llc.GetType () == Ipv4L3Protocol::PROT_NUMBER)
+    {
+      Ipv4Header iph;
+      packet->PeekHeader (iph);
+      if (iph.GetTos () == tos)
+        {
+          (*count)++;
+        }
+    }
 }
 
 void
@@ -111,6 +153,17 @@ WifiAcMappingTest::DoRun (void)
   stack.Install (ap);
   stack.Install (sta);
 
+  TrafficControlHelper tch;
+  uint16_t handle = tch.SetRootQueueDisc ("ns3::MqQueueDisc");
+  TrafficControlHelper::ClassIdList cls = tch.AddQueueDiscClasses (handle, 4, "ns3::QueueDiscClass");
+  TrafficControlHelper::HandleList hdl = tch.AddChildQueueDiscs (handle, cls, "ns3::FqCoDelQueueDisc");
+  for (auto h : hdl)
+    {
+      tch.AddPacketFilter (h, "ns3::FqCoDelIpv4PacketFilter");
+    }
+  tch.Install (apDev);
+  tch.Install (staDev);
+
   Ipv4AddressHelper address;
   address.SetBase ("192.168.0.0", "255.255.255.0");
   Ipv4InterfaceContainer staNodeInterface, apNodeInterface;
@@ -123,7 +176,7 @@ WifiAcMappingTest::DoRun (void)
                                InetSocketAddress (Ipv4Address::GetAny (), udpPort));
   ApplicationContainer sinkApp = packetSink.Install (sta.Get (0));
   sinkApp.Start (Seconds (0));
-  sinkApp.Stop (Seconds (3.0));
+  sinkApp.Stop (Seconds (4.0));
 
   // The packet source is an on-off application on the AP device
   InetSocketAddress dest (staNodeInterface.GetAddress (0), udpPort);
@@ -132,41 +185,49 @@ WifiAcMappingTest::DoRun (void)
   onoff.SetConstantRate (DataRate ("5kbps"), 500);
   ApplicationContainer sourceApp = onoff.Install (ap.Get (0));
   sourceApp.Start (Seconds (1.0));
-  sourceApp.Stop (Seconds (3.0));
+  sourceApp.Stop (Seconds (4.0));
 
   // The first packet will be transmitted at time 1+(500*8)/5000 = 1.8s.
-  // Let this packet be transmitted successfully, so that the AP can resolve
-  // the IP address of the station and get its MAC address.
   // The second packet will be transmitted at time 1.8+(500*8)/5000 = 2.6s.
-  // Put the AP in sleep mode at time 2.0s, so that the second packet remains
-  // in a wifi mac queue and we can discover the queue it has been sent to.
-  Ptr<WifiPhy> apPhy = DynamicCast<WifiNetDevice> (apDev.Get (0))->GetPhy ();
-  Simulator::ScheduleWithContext (ap.Get (0)->GetId (), Seconds (2.0),
-                                  &WifiPhy::SetSleepMode, apPhy);
+  // The third packet will be transmitted at time 2.6+(500*8)/5000 = 3.4s.
 
-  Simulator::Stop (Seconds (4.0));
+  Simulator::Stop (Seconds (5.0));
+
+  Ptr<QueueDisc> root = ap.Get (0)->GetObject<TrafficControlLayer> ()->GetRootQueueDiscOnDevice (apDev.Get (0));
+  NS_TEST_ASSERT_MSG_EQ (root->GetNQueueDiscClasses (), 4, "The root queue disc should have 4 classes");
+  // Get the four child queue discs and connect their Enqueue trace to the PacketEnqueuedInQueueDisc
+  // method, which counts how many packets with the given ToS value have been enqueued
+  root->GetQueueDiscClass (0)->GetQueueDisc ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInQueueDisc, m_tos, m_QueueDiscCount));
+
+  root->GetQueueDiscClass (1)->GetQueueDisc ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInQueueDisc, m_tos, m_QueueDiscCount+1));
+
+  root->GetQueueDiscClass (2)->GetQueueDisc ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInQueueDisc, m_tos, m_QueueDiscCount+2));
+
+  root->GetQueueDiscClass (3)->GetQueueDisc ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInQueueDisc, m_tos, m_QueueDiscCount+3));
 
   Ptr<WifiMac> apMac = DynamicCast<WifiNetDevice> (apDev.Get (0))->GetMac ();
   PointerValue ptr;
-  Ptr<WifiMacQueue> queues[4];
-  // Get the four wifi mac queues and set their MaxDelay attribute to a large
-  // value, so that packets are not removed by the Cleanup method
+  // Get the four wifi mac queues and connect their Enqueue trace to the PacketEnqueuedInWifiMacQueue
+  // method, which counts how many packets with the given ToS value have been enqueued
   apMac->GetAttribute ("BE_EdcaTxopN", ptr);
-  queues[0] = ptr.Get<EdcaTxopN> ()->GetQueue ();
-  queues[0]->SetAttribute ("MaxDelay", TimeValue (Seconds (10.0)));
+  ptr.Get<EdcaTxopN> ()->GetQueue ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInWifiMacQueue, m_tos, m_WifiMacQueueCount));
 
   apMac->GetAttribute ("BK_EdcaTxopN", ptr);
-  queues[1] = ptr.Get<EdcaTxopN> ()->GetQueue ();
-  queues[1]->SetAttribute ("MaxDelay", TimeValue (Seconds (10.0)));
+  ptr.Get<EdcaTxopN> ()->GetQueue ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInWifiMacQueue, m_tos, m_WifiMacQueueCount+1));
 
   apMac->GetAttribute ("VI_EdcaTxopN", ptr);
-  queues[2] = ptr.Get<EdcaTxopN> ()->GetQueue ();
-  queues[2]->SetAttribute ("MaxDelay", TimeValue (Seconds (10.0)));
+  ptr.Get<EdcaTxopN> ()->GetQueue ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInWifiMacQueue, m_tos, m_WifiMacQueueCount+2));
 
   apMac->GetAttribute ("VO_EdcaTxopN", ptr);
-  queues[3] = ptr.Get<EdcaTxopN> ()->GetQueue ();
-  queues[3]->SetAttribute ("MaxDelay", TimeValue (Seconds (10.0)));
-
+  ptr.Get<EdcaTxopN> ()->GetQueue ()->TraceConnectWithoutContext ("Enqueue",
+                        MakeBoundCallback (&WifiAcMappingTest::PacketEnqueuedInWifiMacQueue, m_tos, m_WifiMacQueueCount+3));
 
   Simulator::Run ();
 
@@ -174,19 +235,21 @@ WifiAcMappingTest::DoRun (void)
     {
       if (i == m_expectedQueue)
         {
-          NS_TEST_ASSERT_MSG_EQ (queues[i]->GetNPackets (), 1, "There is no packet in the expected queue " << i);
+          NS_TEST_ASSERT_MSG_GT_OR_EQ (m_QueueDiscCount[i], 1, "There is no packet in the expected queue disc " << i);
+          NS_TEST_ASSERT_MSG_GT_OR_EQ (m_WifiMacQueueCount[i], 1, "There is no packet in the expected Wifi MAC queue " << i);
         }
       else
         {
-          NS_TEST_ASSERT_MSG_EQ (queues[i]->GetNPackets (), 0, "Unexpectedly, there is a packet in queue " << i);
+          NS_TEST_ASSERT_MSG_EQ (m_QueueDiscCount[i], 0, "Unexpectedly, there is a packet in queue disc " << i);
+          NS_TEST_ASSERT_MSG_EQ (m_WifiMacQueueCount[i], 0, "Unexpectedly, there is a packet in Wifi MAC queue " << i);
         }
     }
 
   uint32_t totalOctetsThrough =
     DynamicCast<PacketSink> (sinkApp.Get (0))->GetTotalRx ();
 
-  // Check that the first packet has been received
-  NS_TEST_ASSERT_MSG_EQ (totalOctetsThrough, 500, "A single packet should have been received");
+  // Check that the three packets have been received
+  NS_TEST_ASSERT_MSG_EQ (totalOctetsThrough, 1500, "Three packets should have been received");
 
   Simulator::Destroy ();
 }
diff --git a/src/traffic-control/doc/mq.rst b/src/traffic-control/doc/mq.rst
new file mode 100644
index 000000000..6b973a91d
--- /dev/null
+++ b/src/traffic-control/doc/mq.rst
@@ -0,0 +1,83 @@
+.. include:: replace.txt
+.. highlight:: cpp
+.. highlight:: bash
+
+Mq queue disc
+------------------
+
+This chapter describes the mq queue disc implementation in |ns3|.
+
+mq is a classful multiqueue dummy scheduler developed to best fit the multiqueue
+traffic control API in Linux. The mq scheduler presents device transmission queues as
+classes, allowing to attach different queue discs to them, which are grafted to the
+device transmission queues.
+
+Model Description
+*****************
+
+mq is a multi-queue aware queue disc, meaning that it has as many child queue discs as
+the number of device transmission queues. Each child queue disc maps to a distinct
+device transmission queue. Every packet is enqueued into the child queue disc which
+maps to the device transmission queue in which the device will enqueue
+the packet.
+
+In |ns3|, :cpp:class:`MqQueueDisc` has a wake mode of WAKE_CHILD, which means that the
+traffic control layer enqueues packets directly into one of the child queue discs
+(multi-queue devices can provide a callback to inform the traffic control layer of
+the device transmission queue that will be selected for a given packet). Therefore,
+``MqQueueDisc::DoEnqueue ()`` shall never be called (in fact, it raises a fatal error).
+Given that dequeuing packets is triggered by enqueuing a packet in the queue disc or
+by the device invoking the wake callback, it turns out that ``MqQueueDisc::DoDequeue ()``
+is never called as well (in fact, it raises a fatal error, too).
+
+The mq queue disc does not require packet filters, does not admit internal queues
+and must have as many child queue discs as the number of device transmission queues.
+
+Examples
+========
+
+A typical usage pattern is to create a traffic control helper used to add the required number of
+queue disc classes, attach child queue discs to the classes and (if needed) add packet filters to the
+child queue discs. The following code shows how to install an mq queue disc having FqCodel child queue
+discs:
+
+.. sourcecode:: cpp
+
+  TrafficControlHelper tch;
+  uint16_t handle = tch.SetRootQueueDisc ("ns3::MqQueueDisc");
+  TrafficControlHelper::ClassIdList cls = tch.AddQueueDiscClasses (handle, numTxQueues, "ns3::QueueDiscClass");
+  TrafficControlHelper::HandleList hdl = tch.AddChildQueueDiscs (handle, cls, "ns3::FqCoDelQueueDisc");
+  for (auto h : hdl)
+    {
+      tch.AddPacketFilter (h, "ns3::FqCoDelIpv4PacketFilter");
+    }
+  QueueDiscContainer qdiscs = tch.Install (devices);
+
+Note that the child queue discs attached to the classes do not necessarily have to be of the same type.
+
+Validation
+**********
+
+The mq model is tested using :cpp:class:`WifiAcMappingTestSuite` class defined in
+`src/test/wifi-ac-mapping-test-suite.cc`. The suite considers a node with a QoS-enabled
+wifi device (which has 4 transmission queues) and includes 4 test cases:
+
+* Test 1: EF-marked packets are enqueued in the queue disc which maps to the AC_VI queue
+* Test 2: AF11-marked packets are enqueued in the queue disc which maps to the AC_BK queue
+* Test 3: AF32-marked packets are enqueued in the queue disc which maps to the AC_BE queue
+* Test 4: CS7-marked packets are enqueued in the queue disc which maps to the AC_VO queue
+
+The test suite can be run using the following commands:
+
+::
+
+  $ ./waf configure --enable-examples --enable-tests
+  $ ./waf build
+  $ ./test.py -s ns3-wifi-ac-mapping
+
+or
+
+::
+
+  $ NS_LOG="WifiAcMappingTest" ./waf --run "test-runner --suite=ns3-wifi-ac-mapping"
+
diff --git a/src/traffic-control/model/mq-queue-disc.cc b/src/traffic-control/model/mq-queue-disc.cc
new file mode 100644
index 000000000..6c2e51c89
--- /dev/null
+++ b/src/traffic-control/model/mq-queue-disc.cc
@@ -0,0 +1,101 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2016 Universita' degli Studi di Napoli Federico II
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Authors: Pasquale Imputato <p.imputato@gmail.com>
+ *          Stefano Avallone <stavallo@unina.it>
+ */
+
+#include "ns3/log.h"
+#include "mq-queue-disc.h"
+
+namespace ns3 {
+
+NS_LOG_COMPONENT_DEFINE ("MqQueueDisc");
+
+NS_OBJECT_ENSURE_REGISTERED (MqQueueDisc);
+
+TypeId MqQueueDisc::GetTypeId (void)
+{
+  static TypeId tid = TypeId ("ns3::MqQueueDisc")
+    .SetParent<QueueDisc> ()
+    .SetGroupName ("TrafficControl")
+    .AddConstructor<MqQueueDisc> ()
+  ;
+  return tid;
+}
+
+MqQueueDisc::MqQueueDisc ()
+{
+  NS_LOG_FUNCTION (this);
+}
+
+MqQueueDisc::~MqQueueDisc ()
+{
+  NS_LOG_FUNCTION (this);
+}
+
+MqQueueDisc::WakeMode
+MqQueueDisc::GetWakeMode (void) const
+{
+  return WAKE_CHILD;
+}
+
+bool
+MqQueueDisc::DoEnqueue (Ptr<QueueDiscItem> item)
+{
+  NS_FATAL_ERROR ("MqQueueDisc: DoEnqueue should never be called");
+}
+
+Ptr<QueueDiscItem>
+MqQueueDisc::DoDequeue (void)
+{
+  NS_FATAL_ERROR ("MqQueueDisc: DoDequeue should never be called");
+}
+
+Ptr<const QueueDiscItem>
+MqQueueDisc::DoPeek (void) const
+{
+  NS_FATAL_ERROR ("MqQueueDisc: DoPeek should never be called");
+}
+
+bool
+MqQueueDisc::CheckConfig (void)
+{
+  NS_LOG_FUNCTION (this);
+
+  if (GetNPacketFilters () > 0)
+    {
+      NS_LOG_ERROR ("MqQueueDisc cannot have packet filters");
+      return false;
+    }
+
+  if (GetNInternalQueues () > 0)
+    {
+      NS_LOG_ERROR ("MqQueueDisc cannot have internal queues");
+      return false;
+    }
+
+  return true;
+}
+
+void
+MqQueueDisc::InitializeParams (void)
+{
+  NS_LOG_FUNCTION (this);
+}
+
+} // namespace ns3
diff --git a/src/traffic-control/model/mq-queue-disc.h b/src/traffic-control/model/mq-queue-disc.h
new file mode 100644
index 000000000..8bf23c477
--- /dev/null
+++ b/src/traffic-control/model/mq-queue-disc.h
@@ -0,0 +1,66 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2016 Universita' degli Studi di Napoli Federico II
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Authors: Pasquale Imputato <p.imputato@gmail.com>
+ *          Stefano Avallone <stavallo@unina.it>
+ */
+
+#ifndef MQ_QUEUE_DISC_H
+#define MQ_QUEUE_DISC_H
+
+#include "ns3/queue-disc.h"
+
+namespace ns3 {
+
+/**
+ * \ingroup traffic-control
+ *
+ * mq is a classful multi-queue aware dummy scheduler. It has as many child
+ * queue discs as the number of device transmission queues. Packets are
+ * directly enqueued into and dequeued from child queue discs.
+ */
+class MqQueueDisc : public QueueDisc {
+public:
+  /**
+   * \brief Get the type ID.
+   * \return the object TypeId
+   */
+  static TypeId GetTypeId (void);
+  /**
+   * \brief MqQueueDisc constructor
+   */
+  MqQueueDisc ();
+
+  virtual ~MqQueueDisc();
+
+ /**
+   * \brief Return the wake mode adopted by this queue disc.
+   * \return the wake mode adopted by this queue disc.
+   */
+  WakeMode GetWakeMode (void) const;
+
+private:
+  virtual bool DoEnqueue (Ptr<QueueDiscItem> item);
+  virtual Ptr<QueueDiscItem> DoDequeue (void);
+  virtual Ptr<const QueueDiscItem> DoPeek (void) const;
+  virtual bool CheckConfig (void);
+  virtual void InitializeParams (void);
+};
+
+} // namespace ns3
+
+#endif /* MQ_QUEUE_DISC_H */
diff --git a/src/traffic-control/wscript b/src/traffic-control/wscript
index 21ebed4ef..91dfeb7c6 100644
--- a/src/traffic-control/wscript
+++ b/src/traffic-control/wscript
@@ -17,6 +17,7 @@ def build(bld):
       'model/codel-queue-disc.cc',
       'model/fq-codel-queue-disc.cc',
       'model/pie-queue-disc.cc',
+      'model/mq-queue-disc.cc',
       'helper/traffic-control-helper.cc',
       'helper/queue-disc-container.cc'
         ]
@@ -41,6 +42,7 @@ def build(bld):
       'model/codel-queue-disc.h',
       'model/fq-codel-queue-disc.h',
       'model/pie-queue-disc.h',
+      'model/mq-queue-disc.h',
       'helper/traffic-control-helper.h',
       'helper/queue-disc-container.h'
         ]