tcp-rate-ops.h

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/*
 * Copyright (c) 2018 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 TCP_RATE_OPS_H
#define TCP_RATE_OPS_H
 
#include "ns3/data-rate.h"
#include "ns3/object.h"
#include "ns3/tcp-tx-item.h"
#include "ns3/traced-callback.h"
#include "ns3/traced-value.h"
 
namespace ns3
{
 
class TcpRateOps : public Object
{
  public:
    struct TcpRateSample;
    struct TcpRateConnection;
 
    static TypeId GetTypeId();
    virtual void SkbSent(TcpTxItem* skb, bool isStartOfTransmission) = 0;
 
    virtual void SkbDelivered(TcpTxItem* skb) = 0;
 
    virtual void CalculateAppLimited(uint32_t cWnd,
                                     uint32_t in_flight,
                                     uint32_t segmentSize,
                                     const SequenceNumber32& tailSeq,
                                     const SequenceNumber32& nextTx,
                                     const uint32_t lostOut,
                                     const uint32_t retransOut) = 0;
 
    virtual const TcpRateSample& GenerateSample(uint32_t delivered,
                                                uint32_t lost,
                                                bool is_sack_reneg,
                                                uint32_t priorInFlight,
                                                const Time& minRtt) = 0;
 
    virtual const TcpRateConnection& GetConnectionRate() = 0;
 
    struct TcpRateSample
    {
        DataRate m_deliveryRate{DataRate("0bps")}; 
        bool m_isAppLimited{false};    
        Time m_interval{Seconds(0.0)}; 
        int32_t m_delivered{
            0}; 
        uint32_t m_priorDelivered{0};   
        Time m_priorTime{Seconds(0.0)}; 
        Time m_sendElapsed{
            Seconds(0.0)}; 
        Time m_ackElapsed{
            Seconds(0.0)}; 
        uint32_t m_bytesLoss{
            0}; 
        uint32_t m_priorInFlight{0}; 
        uint32_t m_ackedSacked{0}; 
 
        bool IsValid() const
        {
            return (m_priorTime != Seconds(0.0) || m_interval != Seconds(0.0));
        }
    };
 
    struct TcpRateConnection
    {
        uint64_t m_delivered{0};          
        Time m_deliveredTime{Seconds(0)}; 
        Time m_firstSentTime{
            Seconds(0)}; 
        uint32_t m_appLimited{
            0}; 
        uint32_t m_txItemDelivered{0}; 
        int32_t m_rateDelivered{
            0}; 
        Time m_rateInterval{
            Seconds(0)}; 
        bool m_rateAppLimited{false}; 
    };
};
 
class TcpRateLinux : public TcpRateOps
{
  public:
    static TypeId GetTypeId();
 
    ~TcpRateLinux() override
    {
    }
 
    void SkbSent(TcpTxItem* skb, bool isStartOfTransmission) override;
    void SkbDelivered(TcpTxItem* skb) override;
    void CalculateAppLimited(uint32_t cWnd,
                             uint32_t in_flight,
                             uint32_t segmentSize,
                             const SequenceNumber32& tailSeq,
                             const SequenceNumber32& nextTx,
                             const uint32_t lostOut,
                             const uint32_t retransOut) override;
    const TcpRateSample& GenerateSample(uint32_t delivered,
                                        uint32_t lost,
                                        bool is_sack_reneg,
                                        uint32_t priorInFlight,
                                        const Time& minRtt) override;
 
    const TcpRateConnection& GetConnectionRate() override
    {
        return m_rate;
    }
 
    typedef void (*TcpRateUpdated)(const TcpRateConnection& rate);
 
    typedef void (*TcpRateSampleUpdated)(const TcpRateSample& sample);
 
  private:
    // Rate sample related variables
    TcpRateConnection m_rate;   
    TcpRateSample m_rateSample; 
 
    TracedCallback<const TcpRateConnection&> m_rateTrace;   
    TracedCallback<const TcpRateSample&> m_rateSampleTrace; 
};
 
std::ostream& operator<<(std::ostream& os, const TcpRateOps::TcpRateSample& sample);
 
std::ostream& operator<<(std::ostream& os, const TcpRateOps::TcpRateConnection& rate);
 
bool operator==(const TcpRateLinux::TcpRateSample& lhs, const TcpRateLinux::TcpRateSample& rhs);
 
bool operator==(const TcpRateLinux::TcpRateConnection& lhs,
                const TcpRateLinux::TcpRateConnection& rhs);
 
} // namespace ns3
 
#endif /* TCP_RATE_OPS_H */