An implementation of PRR. More...

#include "tcp-prr-recovery.h"

Inheritance diagram for ns3::TcpPrrRecovery:

Collaboration diagram for ns3::TcpPrrRecovery:

Public Types
enum	ReductionBound_t { CRB, SSRB }
	Reduction Bound variant (CRB or SSRB) More...

Public Member Functions
	TcpPrrRecovery (void)
	Create an unbound tcp socket. More...

	TcpPrrRecovery (const TcpPrrRecovery &sock)
	Copy constructor. More...

virtual	~TcpPrrRecovery (void) override

virtual void	DoRecovery (Ptr< TcpSocketState > tcb, uint32_t deliveredBytes) override
	Performs recovery based on the recovery algorithm. More...

virtual void	EnterRecovery (Ptr< TcpSocketState > tcb, uint32_t dupAckCount, uint32_t unAckDataCount, uint32_t deliveredBytes) override
	Performs variable initialization at the start of recovery. More...

virtual void	ExitRecovery (Ptr< TcpSocketState > tcb) override
	Performs cwnd adjustments at the end of recovery. More...

virtual Ptr< TcpRecoveryOps >	Fork () override
	Copy the recovery algorithm across socket. More...

std::string	GetName () const override
	Get the name of the recovery algorithm. More...

virtual void	UpdateBytesSent (uint32_t bytesSent) override
	Keeps track of bytes sent during recovery phase. More...

Public Member Functions inherited from ns3::TcpClassicRecovery
	TcpClassicRecovery ()
	Constructor. More...

	TcpClassicRecovery (const TcpClassicRecovery &recovery)
	Copy constructor. More...

virtual	~TcpClassicRecovery () override
	Constructor. More...

Public Member Functions inherited from ns3::TcpRecoveryOps
	TcpRecoveryOps ()
	Constructor. More...

	TcpRecoveryOps (const TcpRecoveryOps &other)
	Copy constructor. More...

virtual	~TcpRecoveryOps ()
	Deconstructor. More...

Public Member Functions inherited from ns3::Object
	Object ()
	Constructor. More...

virtual	~Object ()
	Destructor. More...

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together. More...

void	Dispose (void)
	Dispose of this Object. More...

AggregateIterator	GetAggregateIterator (void) const
	Get an iterator to the Objects aggregated to this one. More...

virtual TypeId	GetInstanceTypeId (void) const
	Get the most derived TypeId for this Object. More...

template<typename T >
Ptr< T >	GetObject (void) const
	Get a pointer to the requested aggregated Object. More...

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object by TypeId. More...

template<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object. More...

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object. More...

void	Initialize (void)
	Invoke DoInitialize on all Objects aggregated to this one. More...

bool	IsInitialized (void) const
	Check if the object has been initialized. More...

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Default constructor. More...

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

uint32_t	GetReferenceCount (void) const
	Get the reference count of the object. More...

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment operator. More...

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor. More...

void	GetAttribute (std::string name, AttributeValue &value) const
	Get the value of an attribute, raising fatal errors if unsuccessful. More...

bool	GetAttributeFailSafe (std::string name, AttributeValue &value) const
	Get the value of an attribute without raising erros. More...

void	SetAttribute (std::string name, const AttributeValue &value)
	Set a single attribute, raising fatal errors if unsuccessful. More...

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
	Set a single attribute without raising errors. More...

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
	Connect a TraceSource to a Callback with a context. More...

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
	Connect a TraceSource to a Callback without a context. More...

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected with a context. More...

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected without a context. More...

Static Public Member Functions
static TypeId	GetTypeId (void)
	Get the type ID. More...

Static Public Member Functions inherited from ns3::TcpClassicRecovery
static TypeId	GetTypeId (void)
	Get the type ID. More...

Static Public Member Functions inherited from ns3::TcpRecoveryOps
static TypeId	GetTypeId (void)
	Get the type ID. More...

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId (void)
	Register this type. More...

Static Public Member Functions inherited from ns3::ObjectBase
static TypeId	GetTypeId (void)
	Get the type ID. More...

Private Attributes
uint32_t	m_prrDelivered {0}
	total bytes delivered during recovery phase More...

uint32_t	m_prrOut {0}
	total bytes sent during recovery phase More...

uint32_t	m_recoveryFlightSize {0}
	value of bytesInFlight at the start of recovery phase More...

ReductionBound_t	m_reductionBoundMode {SSRB}
	mode of Reduction Bound to be used More...

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
	Copy an Object. More...

virtual void	DoDispose (void)
	Destructor implementation. More...

virtual void	DoInitialize (void)
	Initialize() implementation. More...

virtual void	NotifyNewAggregate (void)
	Notify all Objects aggregated to this one of a new Object being aggregated. More...

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes. More...

virtual void	NotifyConstructionCompleted (void)
	Notifier called once the ObjectBase is fully constructed. More...

Related Functions inherited from ns3::ObjectBase
static TypeId	GetObjectIid (void)
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. More...

Detailed Description

An implementation of PRR.

Introspection did not find any typical Config paths.

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.

Attributes

ReductionBound: Type of Reduction Bound
- Set with class: ns3::EnumValue
- Underlying type:
- Initial value: SSRB
- Flags: construct write read

No TraceSources are defined for this type.
Size of this type is 48 bytes (on a 64-bit architecture).

Definition at line 42 of file tcp-prr-recovery.h.

Member Enumeration Documentation

◆ ReductionBound_t

enum ns3::TcpPrrRecovery::ReductionBound_t

Reduction Bound variant (CRB or SSRB)

Enumerator
CRB	Conservative Reduction Bound.
SSRB	Slow Start Reduction Bound.

Definition at line 67 of file tcp-prr-recovery.h.

Constructor & Destructor Documentation

◆ TcpPrrRecovery() [1/2]

ns3::TcpPrrRecovery::TcpPrrRecovery ( void )

Create an unbound tcp socket.

Definition at line 50 of file tcp-prr-recovery.cc.

References NS_LOG_FUNCTION.

◆ TcpPrrRecovery() [2/2]

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

Copy constructor.

Parameters

sock	the object to copy

Definition at line 56 of file tcp-prr-recovery.cc.

References NS_LOG_FUNCTION.

◆ ~TcpPrrRecovery()

ns3::TcpPrrRecovery::~TcpPrrRecovery ( void )

overridevirtual

Definition at line 66 of file tcp-prr-recovery.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ DoRecovery()

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

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.

Parameters

tcb	internal congestion state
deliveredBytes	bytes (S)ACKed in the last (S)ACK

Reimplemented from ns3::TcpClassicRecovery.

Definition at line 86 of file tcp-prr-recovery.cc.

References CRB, ns3::TcpSocketState::m_bytesInFlight, ns3::TcpSocketState::m_cWnd, ns3::TcpSocketState::m_cWndInfl, ns3::TcpSocketState::m_isRetransDataAcked, m_prrDelivered, m_prrOut, m_recoveryFlightSize, m_reductionBoundMode, ns3::TcpSocketState::m_segmentSize, ns3::TcpSocketState::m_ssThresh, max, min, NS_LOG_FUNCTION, and SSRB.

Referenced by PrrRecoveryTest::DoRun(), and 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

tcb	internal congestion state
dupAckCount	duplicate acknowldgement count
unAckDataCount	total bytes of data unacknowledged
deliveredBytes	bytes (S)ACKed in the last (S)ACK

Reimplemented from ns3::TcpClassicRecovery.

Definition at line 72 of file tcp-prr-recovery.cc.

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

Referenced by PrrRecoveryTest::DoRun().

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