dynamic-queue-limits.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>
 *
 * This code is a port of the dynamic queue limits library implemented
 * in the Linux kernel by
 * Author: Tom Herbert <therbert@google.com>
 */

#ifndef DYNAMIC_QUEUE_LIMITS_H
#define DYNAMIC_QUEUE_LIMITS_H

#include "queue-limits.h"
#include "ns3/nstime.h"
#include "ns3/traced-value.h"
#include <limits.h>

namespace ns3 {

class DynamicQueueLimits : public QueueLimits {
public:
  static TypeId GetTypeId (void);

  DynamicQueueLimits ();
  virtual ~DynamicQueueLimits ();

  virtual void Reset ();
  virtual void Completed (uint32_t count);
  virtual int32_t Available () const;
  virtual void Queued (uint32_t count);

private:
  int32_t Posdiff (int32_t a, int32_t b);

  // Fields accessed in enqueue path
  uint32_t m_numQueued;                 
  uint32_t m_adjLimit;                  
  uint32_t m_lastObjCnt;                

  // Fields accessed only by completion path
  TracedValue<uint32_t> m_limit;        
  uint32_t m_numCompleted;              

  uint32_t m_prevOvlimit;               
  uint32_t m_prevNumQueued;             
  uint32_t m_prevLastObjCnt;            

  uint32_t m_lowestSlack;               
  Time m_slackStartTime;                

  // Configuration
  uint32_t m_maxLimit;                  
  uint32_t m_minLimit;                  
  Time m_slackHoldTime;                 
};

} // namespace ns3

#endif /* DYNAMIC_QUEUE_LIMITS_H */