fq-pie-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
 * Copyright (c) 2018 NITK Surathkal (modified for FQ-PIE)
 *
 * 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>
 * Modified for FQ-PIE by:  Sumukha PK <sumukhapk46@gmail.com>
 *                          Prajval M  <26prajval98@gmail.com>
 *                          Ishaan R D <ishaanrd6@gmail.com>
 *                          Mohit P. Tahiliani <tahiliani@nitk.edu.in>
 */

#ifndef FQ_PIE_QUEUE_DISC
#define FQ_PIE_QUEUE_DISC

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

namespace ns3 {

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

  virtual ~FqPieFlow ();

  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;
  void SetIndex (uint32_t index);
  uint32_t GetIndex (void) const;

private:
  int32_t m_deficit;    
  FlowStatus m_status;  
  uint32_t m_index;     
};


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

  virtual ~FqPieQueueDisc ();

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

  uint32_t FqPieDrop (void);

  uint32_t SetAssociativeHash (uint32_t flowHash);

  // PIE queue disc parameter
  bool m_useEcn;             
  double m_markEcnTh;        
  Time m_ceThreshold;        
  bool m_useL4s;             
  Time m_sUpdate;            
  Time m_tUpdate;            
  Time m_qDelayRef;          
  uint32_t m_meanPktSize;    
  Time m_maxBurst;           
  double m_a;                
  double m_b;                
  uint32_t m_dqThreshold;    
  bool m_useDqRateEstimator; 
  bool  m_isCapDropAdjustment; 
  bool m_useDerandomization; 

  // Fq parameters
  uint32_t m_quantum;        
  uint32_t m_flows;          
  uint32_t m_setWays;        
  uint32_t m_dropBatchSize;  
  uint32_t m_perturbation;   
  bool m_enableSetAssociativeHash; 

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

  std::map<uint32_t, uint32_t> m_flowsIndices;    
  std::map<uint32_t, uint32_t> m_tags;            

  ObjectFactory m_flowFactory;         
  ObjectFactory m_queueDiscFactory;    
};

} // namespace ns3

#endif /* FQ_PIE_QUEUE_DISC */