tcp-cubic.h

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/*
 * Copyright (c) 2014 Natale Patriciello <natale.patriciello@gmail.com>
 *
 * 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
 *
 */
 
#ifndef TCPCUBIC_H
#define TCPCUBIC_H
 
#include "ns3/tcp-congestion-ops.h"
#include "ns3/tcp-socket-base.h"
 
namespace ns3
{
 
class TcpCubic : public TcpCongestionOps
{
  public:
    enum HybridSSDetectionMode
    {
        PACKET_TRAIN = 1, 
        DELAY = 2,        
        BOTH = 3,         
    };
 
    static TypeId GetTypeId();
 
    TcpCubic();
 
    TcpCubic(const TcpCubic& sock);
 
    std::string GetName() const override;
    void PktsAcked(Ptr<TcpSocketState> tcb, uint32_t segmentsAcked, const Time& rtt) override;
    void IncreaseWindow(Ptr<TcpSocketState> tcb, uint32_t segmentsAcked) override;
    uint32_t GetSsThresh(Ptr<const TcpSocketState> tcb, uint32_t bytesInFlight) override;
    void CongestionStateSet(Ptr<TcpSocketState> tcb,
                            const TcpSocketState::TcpCongState_t newState) override;
 
    Ptr<TcpCongestionOps> Fork() override;
 
  private:
    bool m_fastConvergence; 
    double m_beta;          
 
    bool m_hystart;                        
    HybridSSDetectionMode m_hystartDetect; 
    uint32_t m_hystartLowWindow;           
    Time m_hystartAckDelta;                
    Time m_hystartDelayMin;                
    Time m_hystartDelayMax;                
    uint8_t m_hystartMinSamples; 
 
    uint32_t m_initialCwnd; 
    uint8_t m_cntClamp;     
 
    double m_c; 
 
    // Cubic parameters
    uint32_t m_cWndCnt;        
    uint32_t m_lastMaxCwnd;    
    uint32_t m_bicOriginPoint; 
    double m_bicK;             
                               //    of the current epoch (in s)
    Time m_delayMin;           
    Time m_epochStart;         
    bool m_found;              
    Time m_roundStart;         
    SequenceNumber32 m_endSeq; 
    Time m_lastAck;            
    Time m_cubicDelta;         
    Time m_currRtt;            
    uint32_t m_sampleCnt;      
 
  private:
    void HystartReset(Ptr<const TcpSocketState> tcb);
 
    void CubicReset(Ptr<const TcpSocketState> tcb);
 
    uint32_t Update(Ptr<TcpSocketState> tcb);
 
    void HystartUpdate(Ptr<TcpSocketState> tcb, const Time& delay);
 
    Time HystartDelayThresh(const Time& t) const;
};
 
} // namespace ns3
 
#endif // TCPCUBIC_H