A Discrete-Event Network Simulator
API
tcp-dctcp.h
Go to the documentation of this file.
1/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2/*
3 * Copyright (c) 2017 NITK Surathkal
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation;
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Author: Shravya K.S. <shravya.ks0@gmail.com>
19 *
20 */
21
22#ifndef TCP_DCTCP_H
23#define TCP_DCTCP_H
24
25#include "ns3/tcp-congestion-ops.h"
26#include "ns3/tcp-linux-reno.h"
27#include "ns3/traced-callback.h"
28
29namespace ns3 {
30
38class TcpDctcp : public TcpLinuxReno
39{
40public:
45 static TypeId GetTypeId (void);
46
50 TcpDctcp ();
51
56 TcpDctcp (const TcpDctcp& sock);
57
61 virtual ~TcpDctcp (void);
62
63 // Documented in base class
64 virtual std::string GetName () const;
65
74 virtual void Init (Ptr<TcpSocketState> tcb);
75
83 typedef void (* CongestionEstimateTracedCallback)(uint32_t bytesAcked, uint32_t bytesMarked, double alpha);
84
85 // Documented in base class
87 uint32_t bytesInFlight);
88 virtual Ptr<TcpCongestionOps> Fork ();
89 virtual void PktsAcked (Ptr<TcpSocketState> tcb, uint32_t segmentsAcked,
90 const Time &rtt);
91 virtual void CwndEvent (Ptr<TcpSocketState> tcb,
93private:
100
107
115 const TcpSocketState::TcpCAEvent_t event);
116
122 void Reset (Ptr<TcpSocketState> tcb);
123
129 void InitializeDctcpAlpha (double alpha);
130
135 double m_alpha;
140 double m_g;
147};
148
149} // namespace ns3
150
151#endif /* TCP_DCTCP_H */
152
An implementation of DCTCP.
Definition: tcp-dctcp.h:39
void(* CongestionEstimateTracedCallback)(uint32_t bytesAcked, uint32_t bytesMarked, double alpha)
TracedCallback signature for DCTCP update of congestion state.
Definition: tcp-dctcp.h:83
SequenceNumber32 m_priorRcvNxt
Sequence number of the first missing byte in data.
Definition: tcp-dctcp.h:133
double m_alpha
Parameter used to estimate the amount of network congestion.
Definition: tcp-dctcp.h:135
virtual void CwndEvent(Ptr< TcpSocketState > tcb, const TcpSocketState::TcpCAEvent_t event)
Trigger events/calculations on occurrence of congestion window event.
Definition: tcp-dctcp.cc:261
double m_g
Estimation gain.
Definition: tcp-dctcp.h:140
bool m_initialized
Whether DCTCP has been initialized.
Definition: tcp-dctcp.h:142
bool m_ceState
DCTCP Congestion Experienced state.
Definition: tcp-dctcp.h:138
bool m_priorRcvNxtFlag
Variable used in setting the value of m_priorRcvNxt for first time.
Definition: tcp-dctcp.h:134
void InitializeDctcpAlpha(double alpha)
Initialize the value of m_alpha.
Definition: tcp-dctcp.cc:161
SequenceNumber32 m_nextSeq
TCP sequence number threshold for beginning a new observation window.
Definition: tcp-dctcp.h:136
virtual Ptr< TcpCongestionOps > Fork()
Copy the congestion control algorithm across sockets.
Definition: tcp-dctcp.cc:105
uint32_t m_ackedBytesEcn
Number of acked bytes which are marked.
Definition: tcp-dctcp.h:131
virtual void Init(Ptr< TcpSocketState > tcb)
Set configuration required by congestion control algorithm, This method will force DctcpEcn mode and ...
Definition: tcp-dctcp.cc:112
TcpDctcp()
Create an unbound tcp socket.
Definition: tcp-dctcp.cc:67
void Reset(Ptr< TcpSocketState > tcb)
Resets the value of m_ackedBytesEcn, m_ackedBytesTotal and m_nextSeq.
Definition: tcp-dctcp.cc:169
uint32_t m_ackedBytesTotal
Total number of acked bytes.
Definition: tcp-dctcp.h:132
virtual uint32_t GetSsThresh(Ptr< const TcpSocketState > tcb, uint32_t bytesInFlight)
Get the slow start threshold after a loss event.
Definition: tcp-dctcp.cc:126
static TypeId GetTypeId(void)
Get the type ID.
Definition: tcp-dctcp.cc:33
virtual std::string GetName() const
Get the name of the congestion control algorithm.
Definition: tcp-dctcp.cc:62
bool m_nextSeqFlag
Variable used in setting the value of m_nextSeq for first time.
Definition: tcp-dctcp.h:137
void CeState1to0(Ptr< TcpSocketState > tcb)
Changes state of m_ceState to false.
Definition: tcp-dctcp.cc:205
virtual void PktsAcked(Ptr< TcpSocketState > tcb, uint32_t segmentsAcked, const Time &rtt)
Timing information on received ACK.
Definition: tcp-dctcp.cc:133
void UpdateAckReserved(Ptr< TcpSocketState > tcb, const TcpSocketState::TcpCAEvent_t event)
Updates the value of m_delayedAckReserved.
Definition: tcp-dctcp.cc:236
bool m_delayedAckReserved
Delayed Ack state.
Definition: tcp-dctcp.h:139
TracedCallback< uint32_t, uint32_t, double > m_traceCongestionEstimate
Callback pointer for congestion state update.
Definition: tcp-dctcp.h:146
bool m_useEct0
Use ECT(0) for ECN codepoint.
Definition: tcp-dctcp.h:141
void CeState0to1(Ptr< TcpSocketState > tcb)
Changes state of m_ceState to true.
Definition: tcp-dctcp.cc:178
virtual ~TcpDctcp(void)
Destructor.
Definition: tcp-dctcp.cc:100
Reno congestion control algorithm.
TcpCAEvent_t
Congestion avoidance events.
Simulation virtual time values and global simulation resolution.
Definition: nstime.h:104
a unique identifier for an interface.
Definition: type-id.h:59
Every class exported by the ns3 library is enclosed in the ns3 namespace.