traffic-control-helper.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2015 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
 *
 * Author: Stefano Avallone <stavallo@unina.it>
 */

#include "ns3/log.h"
#include "ns3/abort.h"
#include "ns3/queue-limits.h"
#include "ns3/net-device-queue-interface.h"
#include "ns3/uinteger.h"
#include "ns3/pointer.h"
#include "ns3/traffic-control-layer.h"
#include "traffic-control-helper.h"

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("TrafficControlHelper");

QueueDiscFactory::QueueDiscFactory (ObjectFactory factory)
  : m_queueDiscFactory (factory)
{
}

void
QueueDiscFactory::AddInternalQueue (ObjectFactory factory)
{
  m_internalQueuesFactory.push_back (factory);
}

void
QueueDiscFactory::AddPacketFilter (ObjectFactory factory)
{
  m_packetFiltersFactory.push_back (factory);
}

uint16_t
QueueDiscFactory::AddQueueDiscClass (ObjectFactory factory)
{
  m_queueDiscClassesFactory.push_back (factory);
  return static_cast<uint16_t>(m_queueDiscClassesFactory.size () - 1);
}

void
QueueDiscFactory::SetChildQueueDisc (uint16_t classId, uint16_t handle)
{
  NS_ABORT_MSG_IF (classId >= m_queueDiscClassesFactory.size (),
                   "Cannot attach a queue disc to a non existing class");
  m_classIdChildHandleMap[classId] = handle;
}

Ptr<QueueDisc>
QueueDiscFactory::CreateQueueDisc (const std::vector<Ptr<QueueDisc> > & queueDiscs)
{
  // create the queue disc
  Ptr<QueueDisc> qd = m_queueDiscFactory.Create<QueueDisc> ();

  // create and add the internal queues
  for (std::vector<ObjectFactory>::iterator i = m_internalQueuesFactory.begin ();
       i != m_internalQueuesFactory.end (); i++ )
    {
      qd->AddInternalQueue (i->Create<QueueDisc::InternalQueue> ());
    }

  // create and add the packet filters
  for (std::vector<ObjectFactory>::iterator i = m_packetFiltersFactory.begin ();
       i != m_packetFiltersFactory.end (); i++ )
    {
      qd->AddPacketFilter (i->Create<PacketFilter> ());
    }

  // create and add the queue disc classes
  for (uint16_t i = 0; i < m_queueDiscClassesFactory.size (); i++)
    {
      // the class ID is given by the index i of the vector
      NS_ABORT_MSG_IF (m_classIdChildHandleMap.find (i) == m_classIdChildHandleMap.end (),
                       "Cannot create a queue disc class with no attached queue disc");

      uint16_t handle = m_classIdChildHandleMap[i];
      NS_ABORT_MSG_IF (handle >= queueDiscs.size () || queueDiscs[handle] == 0, 
                       "A queue disc with handle " << handle << " has not been created yet");

      m_queueDiscClassesFactory[i].Set ("QueueDisc", PointerValue (queueDiscs[handle]));
      qd->AddQueueDiscClass (m_queueDiscClassesFactory[i].Create<QueueDiscClass> ());
    }

  return qd;
}


TrafficControlHelper::TrafficControlHelper ()
{
}

TrafficControlHelper
TrafficControlHelper::Default (std::size_t nTxQueues)
{
  NS_LOG_FUNCTION (nTxQueues);
  NS_ABORT_MSG_IF (nTxQueues == 0, "The device must have at least one queue");
  TrafficControlHelper helper;

  if (nTxQueues == 1)
    {
      helper.SetRootQueueDisc ("ns3::FqCoDelQueueDisc");
    }
  else
    {
      uint16_t handle = helper.SetRootQueueDisc ("ns3::MqQueueDisc");
      ClassIdList cls = helper.AddQueueDiscClasses (handle, nTxQueues, "ns3::QueueDiscClass");
      helper.AddChildQueueDiscs (handle, cls, "ns3::FqCoDelQueueDisc");
    }
  return helper;
}

uint16_t
TrafficControlHelper::DoSetRootQueueDisc (ObjectFactory factory)
{
  NS_ABORT_MSG_UNLESS (m_queueDiscFactory.empty (), "A root queue disc has been already added to this factory");

  m_queueDiscFactory.push_back (QueueDiscFactory (factory));
  return 0;
}

void
TrafficControlHelper::DoAddInternalQueues (uint16_t handle, uint16_t count, ObjectFactory factory)
{
  NS_ABORT_MSG_IF (handle >= m_queueDiscFactory.size (), "A queue disc with handle "
                   << handle << " does not exist");

  for (int i = 0; i < count; i++)
    {
      m_queueDiscFactory[handle].AddInternalQueue (factory);
    }
}

void
TrafficControlHelper::DoAddPacketFilter (uint16_t handle, ObjectFactory factory)
{
  NS_ABORT_MSG_IF (handle >= m_queueDiscFactory.size (), "A queue disc with handle "
                   << handle << " does not exist");

  m_queueDiscFactory[handle].AddPacketFilter (factory);
}

TrafficControlHelper::ClassIdList
TrafficControlHelper::DoAddQueueDiscClasses (uint16_t handle, uint16_t count, ObjectFactory factory)
{
  NS_ABORT_MSG_IF (handle >= m_queueDiscFactory.size (), "A queue disc with handle "
                   << handle << " does not exist");

  ClassIdList list;
  uint16_t classId;

  for (int i = 0; i < count; i++)
    {
      classId = m_queueDiscFactory[handle].AddQueueDiscClass (factory);
      list.push_back (classId);
    }
  return list;
}

uint16_t
TrafficControlHelper::DoAddChildQueueDisc (uint16_t handle, uint16_t classId, ObjectFactory factory)
{
  NS_ABORT_MSG_IF (handle >= m_queueDiscFactory.size (), "A queue disc with handle "
                   << handle << " does not exist");

  uint16_t childHandle = static_cast<uint16_t>(m_queueDiscFactory.size ());
  m_queueDiscFactory.push_back (QueueDiscFactory (factory));
  m_queueDiscFactory[handle].SetChildQueueDisc (classId, childHandle);

  return childHandle;
}

TrafficControlHelper::HandleList
TrafficControlHelper::DoAddChildQueueDiscs (uint16_t handle, const TrafficControlHelper::ClassIdList &classes,
                                            ObjectFactory factory)
{
  HandleList list;
  for (ClassIdList::const_iterator c = classes.begin (); c != classes.end (); c++)
    {
      uint16_t childHandle = DoAddChildQueueDisc (handle, *c, factory);
      list.push_back (childHandle);
    }
  return list;
}

QueueDiscContainer
TrafficControlHelper::Install (Ptr<NetDevice> d)
{
  QueueDiscContainer container;

  // A TrafficControlLayer object is aggregated by the InternetStackHelper, but check
  // anyway because a queue disc has no effect without a TrafficControlLayer object
  Ptr<TrafficControlLayer> tc = d->GetNode ()->GetObject<TrafficControlLayer> ();
  NS_ASSERT (tc != 0);

  // Start from an empty vector of queue discs
  m_queueDiscs.clear ();
  m_queueDiscs.resize (m_queueDiscFactory.size ());

  // Create queue discs (from leaves to root)
  for (auto i = m_queueDiscFactory.size (); i-- > 0; )
    {
      m_queueDiscs[i] = m_queueDiscFactory[i].CreateQueueDisc (m_queueDiscs);
    }

  // Set the root queue disc (if any has been created) on the device
  if (!m_queueDiscs.empty () && m_queueDiscs[0])
    {
      tc->SetRootQueueDiscOnDevice (d, m_queueDiscs[0]);
      container.Add (m_queueDiscs[0]);
    }

  // Queue limits objects can only be installed if a netdevice queue interface
  // has been aggregated to the netdevice. This is normally the case if the
  // netdevice has been created via helpers. Abort the simulation if not.
  if (m_queueLimitsFactory.GetTypeId ().GetUid ())
    {
      Ptr<NetDeviceQueueInterface> ndqi = d->GetObject<NetDeviceQueueInterface> ();
      NS_ABORT_MSG_IF (!ndqi, "A NetDeviceQueueInterface object has not been"
                              "aggregated to the NetDevice");
      for (uint8_t i = 0; i < ndqi->GetNTxQueues (); i++)
        {
          Ptr<QueueLimits> ql = m_queueLimitsFactory.Create<QueueLimits> ();
          ndqi->GetTxQueue (i)->SetQueueLimits (ql);
        }
    }

  return container;
}

QueueDiscContainer
TrafficControlHelper::Install (NetDeviceContainer c)
{
  QueueDiscContainer container;

  for (NetDeviceContainer::Iterator i = c.Begin (); i != c.End (); ++i)
    {
      container.Add (Install (*i));
    }

  return container;
}

void
TrafficControlHelper::Uninstall (Ptr<NetDevice> d)
{
  Ptr<TrafficControlLayer> tc = d->GetNode ()->GetObject<TrafficControlLayer> ();
  NS_ASSERT (tc != 0);

  tc->DeleteRootQueueDiscOnDevice (d);
  // remove the queue limits objects installed on the device transmission queues
  Ptr<NetDeviceQueueInterface> ndqi = d->GetObject<NetDeviceQueueInterface> ();
  // if a queue disc has been installed on the device, a netdevice queue interface
  // must have been aggregated to the device
  NS_ASSERT (ndqi);
  for (uint8_t i = 0; i < ndqi->GetNTxQueues (); i++)
    {
      ndqi->GetTxQueue (i)->SetQueueLimits (0);
    }
}

void
TrafficControlHelper::Uninstall (NetDeviceContainer c)
{
  for (NetDeviceContainer::Iterator i = c.Begin (); i != c.End (); ++i)
    {
      Uninstall (*i);
    }
}


} // namespace ns3