tcp-ledbat.h

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/*
 * Copyright (c) 2016 NITK Surathkal
 *
 * 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: Ankit Deepak <adadeepak8@gmail.com>
 *
 */
 
#ifndef TCP_LEDBAT_H
#define TCP_LEDBAT_H
 
#include "tcp-congestion-ops.h"
 
#include <vector>
 
namespace ns3
{
 
class TcpSocketState;
 
class TcpLedbat : public TcpNewReno
{
  private:
    enum SlowStartType
    {
        DO_NOT_SLOWSTART, 
        DO_SLOWSTART,     
    };
 
    enum State : uint32_t
    {
        LEDBAT_VALID_OWD = (1 << 1), 
        LEDBAT_CAN_SS = (1 << 3)     
    };
 
  public:
    static TypeId GetTypeId();
 
    TcpLedbat();
 
    TcpLedbat(const TcpLedbat& sock);
 
    ~TcpLedbat() override;
 
    std::string GetName() const override;
 
    void PktsAcked(Ptr<TcpSocketState> tcb, uint32_t segmentsAcked, const Time& rtt) override;
 
    // Inherited
    Ptr<TcpCongestionOps> Fork() override;
 
    void IncreaseWindow(Ptr<TcpSocketState> tcb, uint32_t segmentsAcked) override;
 
    void SetDoSs(SlowStartType doSS);
 
  protected:
    void CongestionAvoidance(Ptr<TcpSocketState> tcb, uint32_t segmentsAcked) override;
 
  private:
    struct OwdCircBuf
    {
        std::vector<uint32_t> buffer; 
        uint32_t min;                 
    };
 
    void InitCircBuf(OwdCircBuf& buffer);
 
    typedef uint32_t (*FilterFunction)(OwdCircBuf&);
 
    static uint32_t MinCircBuf(OwdCircBuf& b);
 
    uint32_t CurrentDelay(FilterFunction filter);
 
    uint32_t BaseDelay();
 
    void AddDelay(OwdCircBuf& cb, uint32_t owd, uint32_t maxlen);
 
    void UpdateBaseDelay(uint32_t owd);
 
    Time m_target;             
    double m_gain;             
    SlowStartType m_doSs;      
    uint32_t m_baseHistoLen;   
    uint32_t m_noiseFilterLen; 
    uint64_t m_lastRollover;   
    int32_t m_sndCwndCnt;      
    OwdCircBuf m_baseHistory;  
    OwdCircBuf m_noiseFilter;  
    uint32_t m_flag;           
    uint32_t m_minCwnd;        
};
 
} // namespace ns3
 
#endif /* TCP_LEDBAT_H */