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ns3::TcpPrrRecovery Class Reference

An implementation of PRR. More...

#include "tcp-prr-recovery.h"

+ Inheritance diagram for ns3::TcpPrrRecovery:
+ Collaboration diagram for ns3::TcpPrrRecovery:

Public Member Functions

 TcpPrrRecovery ()
 Create an unbound tcp socket.
 
 TcpPrrRecovery (const TcpPrrRecovery &sock)
 Copy constructor.
 
 ~TcpPrrRecovery () override
 
void DoRecovery (Ptr< TcpSocketState > tcb, uint32_t deliveredBytes, bool isDupAck) override
 Performs recovery based on the recovery algorithm.
 
void EnterRecovery (Ptr< TcpSocketState > tcb, uint32_t dupAckCount, uint32_t unAckDataCount, uint32_t deliveredBytes) override
 Performs variable initialization at the start of recovery.
 
void ExitRecovery (Ptr< TcpSocketState > tcb) override
 Performs cwnd adjustments at the end of recovery.
 
Ptr< TcpRecoveryOpsFork () override
 Copy the recovery algorithm across socket.
 
std::string GetName () const override
 Get the name of the recovery algorithm.
 
void UpdateBytesSent (uint32_t bytesSent) override
 Keeps track of bytes sent during recovery phase.
 
- Public Member Functions inherited from ns3::TcpClassicRecovery
 TcpClassicRecovery ()
 Constructor.
 
 TcpClassicRecovery (const TcpClassicRecovery &recovery)
 Copy constructor.
 
 ~TcpClassicRecovery () override
 Constructor.
 
- Public Member Functions inherited from ns3::TcpRecoveryOps
 TcpRecoveryOps ()
 Constructor.
 
 TcpRecoveryOps (const TcpRecoveryOps &other)
 Copy constructor.
 
 ~TcpRecoveryOps () override
 Deconstructor.
 
- Public Member Functions inherited from ns3::Object
 Object ()
 Constructor.
 
 ~Object () override
 Destructor.
 
void AggregateObject (Ptr< Object > other)
 Aggregate two Objects together.
 
void Dispose ()
 Dispose of this Object.
 
AggregateIterator GetAggregateIterator () const
 Get an iterator to the Objects aggregated to this one.
 
TypeId GetInstanceTypeId () const override
 Get the most derived TypeId for this Object.
 
template<typename T >
Ptr< T > GetObject () const
 Get a pointer to the requested aggregated Object.
 
template<>
Ptr< ObjectGetObject () const
 Specialization of () for objects of type ns3::Object.
 
template<typename T >
Ptr< T > GetObject (TypeId tid) const
 Get a pointer to the requested aggregated Object by TypeId.
 
template<>
Ptr< ObjectGetObject (TypeId tid) const
 Specialization of (TypeId tid) for objects of type ns3::Object.
 
void Initialize ()
 Invoke DoInitialize on all Objects aggregated to this one.
 
bool IsInitialized () const
 Check if the object has been initialized.
 
void UnidirectionalAggregateObject (Ptr< Object > other)
 Aggregate an Object to another Object.
 
- Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
 SimpleRefCount ()
 Default constructor.
 
 SimpleRefCount (const SimpleRefCount &o)
 Copy constructor.
 
uint32_t GetReferenceCount () const
 Get the reference count of the object.
 
SimpleRefCountoperator= (const SimpleRefCount &o)
 Assignment operator.
 
void Ref () const
 Increment the reference count.
 
void Unref () const
 Decrement the reference count.
 
- Public Member Functions inherited from ns3::ObjectBase
virtual ~ObjectBase ()
 Virtual destructor.
 
void GetAttribute (std::string name, AttributeValue &value, bool permissive=false) const
 Get the value of an attribute, raising fatal errors if unsuccessful.
 
bool GetAttributeFailSafe (std::string name, AttributeValue &value) const
 Get the value of an attribute without raising errors.
 
void SetAttribute (std::string name, const AttributeValue &value)
 Set a single attribute, raising fatal errors if unsuccessful.
 
bool SetAttributeFailSafe (std::string name, const AttributeValue &value)
 Set a single attribute without raising errors.
 
bool TraceConnect (std::string name, std::string context, const CallbackBase &cb)
 Connect a TraceSource to a Callback with a context.
 
bool TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
 Connect a TraceSource to a Callback without a context.
 
bool TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
 Disconnect from a TraceSource a Callback previously connected with a context.
 
bool TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
 Disconnect from a TraceSource a Callback previously connected without a context.
 

Static Public Member Functions

static TypeId GetTypeId ()
 Get the type ID.
 
- Static Public Member Functions inherited from ns3::TcpClassicRecovery
static TypeId GetTypeId ()
 Get the type ID.
 
- Static Public Member Functions inherited from ns3::TcpRecoveryOps
static TypeId GetTypeId ()
 Get the type ID.
 
- Static Public Member Functions inherited from ns3::Object
static TypeId GetTypeId ()
 Register this type.
 
- Static Public Member Functions inherited from ns3::ObjectBase
static TypeId GetTypeId ()
 Get the type ID.
 

Private Attributes

uint32_t m_prrDelivered {0}
 total bytes delivered during recovery phase
 
uint32_t m_prrOut {0}
 total bytes sent during recovery phase
 
uint32_t m_recoveryFlightSize {0}
 value of bytesInFlight at the start of recovery phase
 

Additional Inherited Members

- Protected Member Functions inherited from ns3::Object
 Object (const Object &o)
 Copy an Object.
 
virtual void DoDispose ()
 Destructor implementation.
 
virtual void DoInitialize ()
 Initialize() implementation.
 
virtual void NotifyNewAggregate ()
 Notify all Objects aggregated to this one of a new Object being aggregated.
 
- Protected Member Functions inherited from ns3::ObjectBase
void ConstructSelf (const AttributeConstructionList &attributes)
 Complete construction of ObjectBase; invoked by derived classes.
 
virtual void NotifyConstructionCompleted ()
 Notifier called once the ObjectBase is fully constructed.
 

Detailed Description

An implementation of PRR.

PRR is an algorithm that determines TCP's sending rate in fast recovery. PRR avoids excessive window reductions and aims for the actual congestion window size at the end of recovery to be as close as possible to the window determined by the congestion control algorithm. PRR also improves accuracy of the amount of data sent during loss recovery.

Definition at line 31 of file tcp-prr-recovery.h.

Constructor & Destructor Documentation

◆ TcpPrrRecovery() [1/2]

ns3::TcpPrrRecovery::TcpPrrRecovery ( )

Create an unbound tcp socket.

Definition at line 34 of file tcp-prr-recovery.cc.

References NS_LOG_FUNCTION.

◆ TcpPrrRecovery() [2/2]

ns3::TcpPrrRecovery::TcpPrrRecovery ( const TcpPrrRecovery & sock)

Copy constructor.

Parameters
sockthe object to copy

Definition at line 40 of file tcp-prr-recovery.cc.

References NS_LOG_FUNCTION.

◆ ~TcpPrrRecovery()

ns3::TcpPrrRecovery::~TcpPrrRecovery ( )
override

Definition at line 49 of file tcp-prr-recovery.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ DoRecovery()

void ns3::TcpPrrRecovery::DoRecovery ( Ptr< TcpSocketState > tcb,
uint32_t deliveredBytes,
bool isDupAck )
overridevirtual

Performs recovery based on the recovery algorithm.

The function is called on arrival of every ack when TcpSocketState is set to CA_RECOVERY. It performs the necessary cwnd changes as per the recovery algorithm. The param isDupAck has been added to align PRR implementation with RFC 6937 bis-08.

Parameters
tcbinternal congestion state
deliveredBytesbytes (S)ACKed in the last (S)ACK
isDupAckIndicates if the last acknowledgement was duplicate.

Reimplemented from ns3::TcpClassicRecovery.

Definition at line 70 of file tcp-prr-recovery.cc.

References m_prrDelivered, m_prrOut, m_recoveryFlightSize, and NS_LOG_FUNCTION.

Referenced by EnterRecovery().

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◆ EnterRecovery()

void ns3::TcpPrrRecovery::EnterRecovery ( Ptr< TcpSocketState > tcb,
uint32_t dupAckCount,
uint32_t unAckDataCount,
uint32_t deliveredBytes )
overridevirtual

Performs variable initialization at the start of recovery.

The function is called when the TcpSocketState is changed to CA_RECOVERY.

Parameters
tcbinternal congestion state
dupAckCountduplicate acknowledgement count
unAckDataCounttotal bytes of data unacknowledged
deliveredBytesbytes (S)ACKed in the last (S)ACK

Reimplemented from ns3::TcpClassicRecovery.

Definition at line 55 of file tcp-prr-recovery.cc.

References DoRecovery(), m_prrDelivered, m_prrOut, m_recoveryFlightSize, and NS_LOG_FUNCTION.

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◆ ExitRecovery()

void ns3::TcpPrrRecovery::ExitRecovery ( Ptr< TcpSocketState > tcb)
overridevirtual

Performs cwnd adjustments at the end of recovery.

The function is called when the TcpSocketState is changed from CA_RECOVERY.

Parameters
tcbinternal congestion state

Reimplemented from ns3::TcpClassicRecovery.

Definition at line 118 of file tcp-prr-recovery.cc.

References NS_LOG_FUNCTION.

◆ Fork()

Ptr< TcpRecoveryOps > ns3::TcpPrrRecovery::Fork ( )
overridevirtual

Copy the recovery algorithm across socket.

Returns
a pointer of the copied object

Reimplemented from ns3::TcpClassicRecovery.

Definition at line 132 of file tcp-prr-recovery.cc.

References ns3::Object::CopyObject.

◆ GetName()

std::string ns3::TcpPrrRecovery::GetName ( ) const
overridevirtual

Get the name of the recovery algorithm.

Returns
A string identifying the name

Reimplemented from ns3::TcpClassicRecovery.

Definition at line 138 of file tcp-prr-recovery.cc.

◆ GetTypeId()

TypeId ns3::TcpPrrRecovery::GetTypeId ( )
static

Get the type ID.

Returns
the object TypeId

Definition at line 25 of file tcp-prr-recovery.cc.

References ns3::TypeId::SetParent().

Referenced by ns3::TcpL4Protocol::GetTypeId().

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◆ UpdateBytesSent()

void ns3::TcpPrrRecovery::UpdateBytesSent ( uint32_t bytesSent)
overridevirtual

Keeps track of bytes sent during recovery phase.

The function is called whenever a data packet is sent during recovery phase (optional).

Parameters
bytesSentbytes sent

Reimplemented from ns3::TcpRecoveryOps.

Definition at line 125 of file tcp-prr-recovery.cc.

References m_prrOut, and NS_LOG_FUNCTION.

Member Data Documentation

◆ m_prrDelivered

uint32_t ns3::TcpPrrRecovery::m_prrDelivered {0}
private

total bytes delivered during recovery phase

Definition at line 69 of file tcp-prr-recovery.h.

Referenced by DoRecovery(), and EnterRecovery().

◆ m_prrOut

uint32_t ns3::TcpPrrRecovery::m_prrOut {0}
private

total bytes sent during recovery phase

Definition at line 70 of file tcp-prr-recovery.h.

Referenced by DoRecovery(), EnterRecovery(), and UpdateBytesSent().

◆ m_recoveryFlightSize

uint32_t ns3::TcpPrrRecovery::m_recoveryFlightSize {0}
private

value of bytesInFlight at the start of recovery phase

Definition at line 71 of file tcp-prr-recovery.h.

Referenced by DoRecovery(), and EnterRecovery().


The documentation for this class was generated from the following files: