fq-codel-queue-disc.h

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/* -*- 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 <stefano.avallone@unina.it>
 */

#ifndef FQ_CODEL_QUEUE_DISC
#define FQ_CODEL_QUEUE_DISC

#include "ns3/queue-disc.h"
#include "ns3/object-factory.h"
#include <list>
#include <map>

namespace ns3 {

class FqCoDelFlow : public QueueDiscClass {
public:
  static TypeId GetTypeId (void);
  FqCoDelFlow ();

  virtual ~FqCoDelFlow ();

  enum FlowStatus
    {
      INACTIVE,
      NEW_FLOW,
      OLD_FLOW
    };

  void SetDeficit (uint32_t deficit);
  int32_t GetDeficit (void) const;
  void IncreaseDeficit (int32_t deficit);
  void SetStatus (FlowStatus status);
  FlowStatus GetStatus (void) const;

private:
  int32_t m_deficit;    
  FlowStatus m_status;  
};


class FqCoDelQueueDisc : public QueueDisc {
public:
  static TypeId GetTypeId (void);
  FqCoDelQueueDisc ();

  virtual ~FqCoDelQueueDisc ();

   void SetQuantum (uint32_t quantum);

   uint32_t GetQuantum (void) const;

  // Reasons for dropping packets
  static constexpr const char* UNCLASSIFIED_DROP = "Unclassified drop";  
  static constexpr const char* OVERLIMIT_DROP = "Overlimit drop";        

private:
  void SetLimit (uint32_t limit);

  uint32_t GetLimit (void) const;

  virtual bool DoEnqueue (Ptr<QueueDiscItem> item);
  virtual Ptr<QueueDiscItem> DoDequeue (void);
  virtual Ptr<const QueueDiscItem> DoPeek (void);
  virtual bool CheckConfig (void);
  virtual void InitializeParams (void);

  uint32_t FqCoDelDrop (void);

  std::string m_interval;    
  std::string m_target;      
  uint32_t m_quantum;        
  uint32_t m_flows;          
  uint32_t m_dropBatchSize;  

  std::list<Ptr<FqCoDelFlow> > m_newFlows;    
  std::list<Ptr<FqCoDelFlow> > m_oldFlows;    

  std::map<uint32_t, uint32_t> m_flowsIndices;    

  ObjectFactory m_flowFactory;         
  ObjectFactory m_queueDiscFactory;    
};

} // namespace ns3

#endif /* FQ_CODEL_QUEUE_DISC */