Linux pfifo_fast is the default priority queue enabled on Linux systems. More...

#include "pfifo-fast-queue-disc.h"

Inheritance diagram for ns3::PfifoFastQueueDisc:

Collaboration diagram for ns3::PfifoFastQueueDisc:

Public Member Functions
	PfifoFastQueueDisc ()
	PfifoFastQueueDisc constructor. More...

virtual	~PfifoFastQueueDisc ()

Public Member Functions inherited from ns3::QueueDisc
	QueueDisc (QueueDiscSizePolicy policy=QueueDiscSizePolicy::SINGLE_INTERNAL_QUEUE)
	Constructor. More...

	QueueDisc (QueueDiscSizePolicy policy, QueueSizeUnit unit)
	Constructor. More...

virtual	~QueueDisc ()

void	AddInternalQueue (Ptr< InternalQueue > queue)
	Add an internal queue to the tail of the list of queues. More...

void	AddPacketFilter (Ptr< PacketFilter > filter)
	Add a packet filter to the tail of the list of filters used to classify packets. More...

void	AddQueueDiscClass (Ptr< QueueDiscClass > qdClass)
	Add a queue disc class to the tail of the list of classes. More...

int32_t	Classify (Ptr< QueueDiscItem > item)
	Classify a packet by calling the packet filters, one at a time, until either a filter able to classify the packet is found or all the filters have been processed. More...

Ptr< QueueDiscItem >	Dequeue (void)
	Request the queue discipline to extract a packet. More...

Ptr< QueueDiscItem >	DequeuePeeked (void)
	Extract from the queue disc the packet that has been dequeued by calling PeekDequeued. More...

bool	Enqueue (Ptr< QueueDiscItem > item)
	Pass a packet to store to the queue discipline. More...

QueueSize	GetCurrentSize (void)
	Get the current size of the queue disc in bytes, if operating in bytes mode, or packets, otherwise. More...

Ptr< InternalQueue >	GetInternalQueue (uint32_t i) const
	Get the i-th internal queue. More...

QueueSize	GetMaxSize (void) const
	Get the maximum size of the queue disc. More...

uint32_t	GetNBytes (void) const
	Get the amount of bytes stored by the queue disc. More...

Ptr< NetDevice >	GetNetDevice (void) const
	Get the NetDevice on which this queue discipline is installed. More...

uint32_t	GetNInternalQueues (void) const
	Get the number of internal queues. More...

uint32_t	GetNPacketFilters (void) const
	Get the number of packet filters. More...

uint32_t	GetNPackets (void) const
	Get the number of packets stored by the queue disc. More...

uint32_t	GetNQueueDiscClasses (void) const
	Get the number of queue disc classes. More...

Ptr< PacketFilter >	GetPacketFilter (uint32_t i) const
	Get the i-th packet filter. More...

Ptr< QueueDiscClass >	GetQueueDiscClass (uint32_t i) const
	Get the i-th queue disc class. More...

virtual uint32_t	GetQuota (void) const
	Get the maximum number of dequeue operations following a packet enqueue. More...

const Stats &	GetStats (void)
	Retrieve all the collected statistics. More...

virtual WakeMode	GetWakeMode (void) const
	When setting up the wake callbacks on the netdevice queues, it is necessary to determine which queue disc (the root queue disc or one of its children) should be activated when the netdevice wakes one of its transmission queues. More...

Ptr< const QueueDiscItem >	Peek (void)
	Get a copy of the next packet the queue discipline will extract, without actually extracting the packet. More...

void	Run (void)
	Modelled after the Linux function __qdisc_run (net/sched/sch_generic.c) Dequeues multiple packets, until a quota is exceeded or sending a packet to the device failed. More...

bool	SetMaxSize (QueueSize size)
	Set the maximum size of the queue disc. More...

void	SetNetDevice (Ptr< NetDevice > device)
	Set the NetDevice on which this queue discipline is installed. More...

virtual void	SetQuota (const uint32_t quota)
	Set the maximum number of dequeue operations following a packet enqueue. 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...

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::QueueDisc
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...

Static Public Attributes
static constexpr const char *	LIMIT_EXCEEDED_DROP = "Queue disc limit exceeded"
	Packet dropped due to queue disc limit exceeded. More...

Static Public Attributes inherited from ns3::QueueDisc
static constexpr const char *	CHILD_QUEUE_DISC_DROP = "(Dropped by child queue disc) "
	Packet dropped by a child queue disc. More...

static constexpr const char *	INTERNAL_QUEUE_DROP = "Dropped by internal queue"
	Packet dropped by an internal queue. More...

Private Member Functions
virtual bool	CheckConfig (void)
	Check whether the current configuration is correct. More...

virtual Ptr< QueueDiscItem >	DoDequeue (void)
	This function actually extracts a packet from the queue disc. More...

virtual bool	DoEnqueue (Ptr< QueueDiscItem > item)
	This function actually enqueues a packet into the queue disc. More...

virtual Ptr< const QueueDiscItem >	DoPeek (void)
	This function returns a copy of the next packet the queue disc will extract. More...

uint32_t	GetLimit (void) const
	Get the limit of this queue disc. More...

virtual void	InitializeParams (void)
	Initialize parameters (if any) before the first packet is enqueued. More...

void	SetLimit (uint32_t limit)
	Set the limit of this queue disc. More...

Static Private Attributes
static const uint32_t	prio2band [16] = {1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1}
	Priority to band map. More...

Additional Inherited Members
Public Types inherited from ns3::QueueDisc
typedef Queue< QueueDiscItem >	InternalQueue
	Internal queues store QueueDiscItem objects. More...

enum	WakeMode { WAKE_ROOT = 0x00, WAKE_CHILD = 0x01 }
	Used to determine whether the queue disc itself or its children must be activated when a netdevice wakes a transmission queue. More...

Protected Member Functions inherited from ns3::QueueDisc
virtual void	DoDispose (void)
	Dispose of the object. More...

void	DoInitialize (void)
	Check whether the configuration is correct and initialize parameters. More...

void	DropAfterDequeue (Ptr< const QueueDiscItem > item, const char *reason)
	Perform the actions required when the queue disc is notified of a packet dropped after dequeue. More...

void	DropBeforeEnqueue (Ptr< const QueueDiscItem > item, const char *reason)
	Perform the actions required when the queue disc is notified of a packet dropped before enqueue. More...

bool	Mark (Ptr< QueueDiscItem > item, const char *reason)
	Marks the given packet and, if successful, updates the counters associated with the given reason. More...

Ptr< const QueueDiscItem >	PeekDequeued (void)
	Dequeue a packet and retain it in the queue disc as a requeued packet. More...

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

Linux pfifo_fast is the default priority queue enabled on Linux systems.

Introspection did not find any typical Config paths.

Packets are enqueued in three FIFO droptail queues according to three priority bands based on the packet priority.

The system behaves similar to three ns3::DropTail queues operating together, in which packets from higher priority bands are always dequeued before a packet from a lower priority band is dequeued.

The queue disc capacity, i.e., the maximum number of packets that can be enqueued in the queue disc, is set through the limit attribute, which plays the same role as txqueuelen in Linux. If no internal queue is provided, three DropTail queues having each a capacity equal to limit are created by default. User is allowed to provide queues, but they must be three, operate in packet mode and each have a capacity not less than limit. No packet filter can be provided.

Attributes

Limit: The maximum number of packets accepted by this queue disc.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 1000
- Flags: construct write read
MaxSize: The maximum number of packets accepted by this queue disc.
- Set with class: QueueSizeValue
- Underlying type: QueueSize
- Initial value: 0p
- Flags: construct write read

Attributes defined in parent class ns3::QueueDisc

Quota: The maximum number of packets dequeued in a qdisc run
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 64
- Flags: construct write read
InternalQueueList: The list of internal queues.
- Set with class: ns3::ObjectPtrContainerValue
- Underlying type: ns3::Ptr< ns3::Queue<QueueDiscItem>>
- Flags: read
PacketFilterList: The list of packet filters.
- Set with class: ns3::ObjectPtrContainerValue
- Underlying type: ns3::Ptr< ns3::PacketFilter>
- Flags: read
QueueDiscClassList: The list of queue disc classes.
- Set with class: ns3::ObjectPtrContainerValue
- Underlying type: ns3::Ptr< ns3::QueueDiscClass>
- Flags: read

No TraceSources are defined for this type.

TraceSources defined in parent class ns3::QueueDisc

Enqueue: Enqueue a packet in the queue disc
Callback signature: ns3::QueueDiscItem::TracedCallback
Dequeue: Dequeue a packet from the queue disc
Callback signature: ns3::QueueDiscItem::TracedCallback
Requeue: Requeue a packet in the queue disc
Callback signature: ns3::QueueDiscItem::TracedCallback
Drop: Drop a packet stored in the queue disc
Callback signature: ns3::QueueDiscItem::TracedCallback
DropBeforeEnqueue: Drop a packet before enqueue
Callback signature: ns3::QueueDiscItem::TracedCallback
DropAfterDequeue: Drop a packet after dequeue
Callback signature: ns3::QueueDiscItem::TracedCallback
Mark: Mark a packet stored in the queue disc
Callback signature: ns3::QueueDiscItem::TracedCallback
PacketsInQueue: Number of packets currently stored in the queue disc
Callback signature: ns3::TracedValueCallback::Uint32
BytesInQueue: Number of bytes currently stored in the queue disc
Callback signature: ns3::TracedValueCallback::Uint32
SojournTime: Sojourn time of the last packet dequeued from the queue disc
Callback signature: ns3::TracedValueCallback::Time

Size of this type is 904 bytes (on a 64-bit architecture).

Definition at line 49 of file pfifo-fast-queue-disc.h.

Constructor & Destructor Documentation

ns3::PfifoFastQueueDisc::PfifoFastQueueDisc ( )

PfifoFastQueueDisc constructor.

Creates a queue with a depth of 1000 packets per band by default

Definition at line 60 of file pfifo-fast-queue-disc.cc.

References NS_LOG_FUNCTION.

ns3::PfifoFastQueueDisc::~PfifoFastQueueDisc ( )

virtual

Definition at line 66 of file pfifo-fast-queue-disc.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

bool ns3::PfifoFastQueueDisc::CheckConfig ( void )

privatevirtual

Check whether the current configuration is correct.

Default objects (such as internal queues) might be created by this method to ensure the configuration is correct.

Returns: true if the configuration is correct, false otherwise

Implements ns3::QueueDisc.

Definition at line 166 of file pfifo-fast-queue-disc.cc.

References ns3::QueueDisc::AddInternalQueue(), ns3::ObjectFactory::Create(), ns3::QueueDisc::GetInternalQueue(), ns3::QueueDisc::GetMaxSize(), ns3::QueueDisc::GetNInternalQueues(), ns3::QueueDisc::GetNPacketFilters(), ns3::QueueDisc::GetNQueueDiscClasses(), NS_LOG_ERROR, NS_LOG_FUNCTION, ns3::PACKETS, ns3::ObjectFactory::Set(), and ns3::ObjectFactory::SetTypeId().

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Ptr< QueueDiscItem > ns3::PfifoFastQueueDisc::DoDequeue ( void )

privatevirtual

This function actually extracts a packet from the queue disc.

Returns: 0 if the operation was not successful; the item otherwise.

Implements ns3::QueueDisc.

Definition at line 110 of file pfifo-fast-queue-disc.cc.

References ns3::QueueDisc::Dequeue(), ns3::QueueDisc::GetInternalQueue(), ns3::QueueDisc::GetNInternalQueues(), ns3::QueueDisc::GetNPackets(), NS_LOG_FUNCTION, and NS_LOG_LOGIC().

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bool ns3::PfifoFastQueueDisc::DoEnqueue ( Ptr< QueueDiscItem > item )

privatevirtual

This function actually enqueues a packet into the queue disc.

Parameters

item	item to enqueue

Returns: True if the operation was successful; false otherwise

Implements ns3::QueueDisc.

Definition at line 74 of file pfifo-fast-queue-disc.cc.

References ns3::QueueDisc::DropBeforeEnqueue(), ns3::QueueDisc::GetCurrentSize(), ns3::QueueDisc::GetInternalQueue(), ns3::QueueDisc::GetMaxSize(), ns3::QueueDisc::GetNPackets(), ns3::SocketPriorityTag::GetPriority(), LIMIT_EXCEEDED_DROP, NS_LOG_FUNCTION, NS_LOG_LOGIC(), NS_LOG_WARN, and prio2band.

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Ptr< const QueueDiscItem > ns3::PfifoFastQueueDisc::DoPeek ( void )

privatevirtual

This function returns a copy of the next packet the queue disc will extract.

Returns: 0 if the operation was not successful; the packet otherwise.

Implements ns3::QueueDisc.

Definition at line 131 of file pfifo-fast-queue-disc.cc.

References ns3::QueueDisc::GetInternalQueue(), ns3::QueueDisc::GetNInternalQueues(), ns3::QueueDisc::GetNPackets(), NS_LOG_FUNCTION, NS_LOG_LOGIC(), and ns3::QueueDisc::Peek().

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uint32_t ns3::PfifoFastQueueDisc::GetLimit ( void ) const

private

Get the limit of this queue disc.

Returns: The limit of this queue disc.

Deprecated:: This method will go away in future versions of ns-3. See instead GetMaxSize()

Definition at line 159 of file pfifo-fast-queue-disc.cc.

References ns3::QueueDisc::GetMaxSize(), ns3::QueueSize::GetValue(), and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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TypeId ns3::PfifoFastQueueDisc::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

Definition at line 36 of file pfifo-fast-queue-disc.cc.

References ns3::TypeId::DEPRECATED, GetLimit(), ns3::QueueDisc::GetMaxSize(), ns3::MakeQueueSizeAccessor(), ns3::MakeQueueSizeChecker(), ns3::MakeUintegerAccessor(), SetLimit(), ns3::QueueDisc::SetMaxSize(), and ns3::TypeId::SetParent().

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void ns3::PfifoFastQueueDisc::InitializeParams ( void )

privatevirtual

Initialize parameters (if any) before the first packet is enqueued.

Implements ns3::QueueDisc.

Definition at line 219 of file pfifo-fast-queue-disc.cc.

References NS_LOG_FUNCTION.

void ns3::PfifoFastQueueDisc::SetLimit ( uint32_t limit )

private

Set the limit of this queue disc.

Parameters

limit The limit of this queue disc.

Deprecated:: This method will go away in future versions of ns-3. See instead SetMaxSize()

Definition at line 152 of file pfifo-fast-queue-disc.cc.

References NS_LOG_FUNCTION, ns3::PACKETS, and ns3::QueueDisc::SetMaxSize().

Referenced by GetTypeId().

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Member Data Documentation

constexpr const char* ns3::PfifoFastQueueDisc::LIMIT_EXCEEDED_DROP = "Queue disc limit exceeded"

static

Packet dropped due to queue disc limit exceeded.

Definition at line 66 of file pfifo-fast-queue-disc.h.

Referenced by DoEnqueue().

const uint32_t ns3::PfifoFastQueueDisc::prio2band = {1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1}

staticprivate

Priority to band map.

Values are taken from the prio2band array used by the Linux pfifo_fast queue disc.

Definition at line 91 of file pfifo-fast-queue-disc.h.

Referenced by DoEnqueue().

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

src/traffic-control/model/pfifo-fast-queue-disc.h
src/traffic-control/model/pfifo-fast-queue-disc.cc

Public Member Functions

Static Public Member Functions

Static Public Attributes

Private Member Functions

Static Private Attributes

Additional Inherited Members

Detailed Description

Attributes

Attributes defined in parent class ns3::QueueDisc

TraceSources defined in parent class ns3::QueueDisc

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation