QueueDisc is an abstract base class providing the interface and implementing the operations common to all the queueing disciplines. More...

#include "queue-disc.h"

Inheritance diagram for ns3::QueueDisc:

Collaboration diagram for ns3::QueueDisc:

Classes
struct	Stats
	Structure that keeps the queue disc statistics. More...

Public Types
typedef Queue< QueueDiscItem >	InternalQueue
	Internal queues store QueueDiscItem objects. More...

typedef std::function< void(Ptr< QueueDiscItem >)>	SendCallback
	Callback invoked to send a packet to the receiving object when Run is called. 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...

Public Member Functions
	QueueDisc (const QueueDisc &)=delete

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

	QueueDisc (QueueDiscSizePolicy policy=QueueDiscSizePolicy::SINGLE_INTERNAL_QUEUE)
	Constructor. More...

	~QueueDisc () override

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 ()
	Extract from the queue disc the packet that has been dequeued by calling Peek, if any, or call the private DoDequeue method (which must be implemented by derived classes) to dequeue a packet, otherwise. More...

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

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

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

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

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

Ptr< NetDeviceQueueInterface >	GetNetDeviceQueueInterface () const

std::size_t	GetNInternalQueues () const
	Get the number of internal queues. More...

std::size_t	GetNPacketFilters () const
	Get the number of packet filters. More...

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

std::size_t	GetNQueueDiscClasses () const
	Get the number of queue disc classes. More...

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

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

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

SendCallback	GetSendCallback () const

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

virtual WakeMode	GetWakeMode () 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...

QueueDisc &	operator= (const QueueDisc &)=delete

Ptr< const QueueDiscItem >	Peek ()
	Get a copy of the next packet the queue discipline will extract. More...

void	Run ()
	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	SetNetDeviceQueueInterface (Ptr< NetDeviceQueueInterface > ndqi)

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

void	SetSendCallback (SendCallback func)

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

	~Object () override
	Destructor. More...

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

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

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

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

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

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

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

bool	IsInitialized () 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[[maybe_unused]])
	Copy constructor. More...

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

SimpleRefCount &	operator= (const SimpleRefCount &o[[maybe_unused]])
	Assignment operator. More...

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

void	Unref () 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 errors. 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 ()
	Get the type ID. More...

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

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

Static Public Attributes
static constexpr const char *	CHILD_QUEUE_DISC_DROP
	Packet dropped by a child queue disc. More...

static constexpr const char *	CHILD_QUEUE_DISC_MARK
	Packet marked by a child queue disc. More...

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

Protected Member Functions
void	DoDispose () override
	Dispose of the object. More...

void	DoInitialize () override
	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...

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

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

Private Types
typedef std::function< void(Ptr< const QueueDiscItem >, const char *)>	ChildQueueDiscDropFunctor
	Type for the function objects notifying that a packet has been dropped by a child queue disc. More...

typedef std::function< void(Ptr< const QueueDiscItem >, const char *)>	ChildQueueDiscMarkFunctor
	Type for the function objects notifying that a packet has been marked by a child queue disc. More...

typedef std::function< void(Ptr< const QueueDiscItem >)>	InternalQueueDropFunctor
	Type for the function objects notifying that a packet has been dropped by an internal queue. More...

Private Member Functions
virtual bool	CheckConfig ()=0
	Check whether the current configuration is correct. More...

Ptr< QueueDiscItem >	DequeuePacket ()
	Modelled after the Linux function dequeue_skb (net/sched/sch_generic.c) More...

virtual Ptr< QueueDiscItem >	DoDequeue ()=0
	This function actually extracts a packet from the queue disc. More...

virtual bool	DoEnqueue (Ptr< QueueDiscItem > item)=0
	This function actually enqueues a packet into the queue disc. More...

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

virtual void	InitializeParams ()=0
	Initialize parameters (if any) before the first packet is enqueued. More...

void	PacketDequeued (Ptr< const QueueDiscItem > item)
	Perform the actions required when the queue disc is notified of a packet dequeue. More...

void	PacketEnqueued (Ptr< const QueueDiscItem > item)
	Perform the actions required when the queue disc is notified of a packet enqueue. More...

void	Requeue (Ptr< QueueDiscItem > item)
	Modelled after the Linux function dev_requeue_skb (net/sched/sch_generic.c) Requeues a packet whose transmission failed. More...

bool	Restart ()
	Modelled after the Linux function qdisc_restart (net/sched/sch_generic.c) Dequeue a packet (by calling DequeuePacket) and send it to the device (by calling Transmit). More...

bool	RunBegin ()
	Modelled after the Linux function qdisc_run_begin (include/net/sch_generic.h). More...

void	RunEnd ()
	Modelled after the Linux function qdisc_run_end (include/net/sch_generic.h). More...

bool	Transmit (Ptr< QueueDiscItem > item)
	Modelled after the Linux function sch_direct_xmit (net/sched/sch_generic.c) Sends a packet to the device if the device queue is not stopped, and requeues it otherwise. More...

Private Attributes
ChildQueueDiscDropFunctor	m_childQueueDiscDadFunctor
	Function object called when a child queue disc dropped a packet after dequeue. More...

ChildQueueDiscDropFunctor	m_childQueueDiscDbeFunctor
	Function object called when a child queue disc dropped a packet before enqueue. More...

std::string	m_childQueueDiscDropMsg
	Reason why a packet was dropped by a child queue disc. More...

ChildQueueDiscMarkFunctor	m_childQueueDiscMarkFunctor
	Function object called when a child queue disc marked a packet. More...

std::string	m_childQueueDiscMarkMsg
	Reason why a packet was marked by a child queue disc. More...

std::vector< Ptr< QueueDiscClass > >	m_classes
	Classes. More...

Ptr< NetDeviceQueueInterface >	m_devQueueIface
	NetDevice queue interface. More...

std::vector< Ptr< PacketFilter > >	m_filters
	Packet filters. More...

InternalQueueDropFunctor	m_internalQueueDadFunctor
	Function object called when an internal queue dropped a packet after dequeue. More...

InternalQueueDropFunctor	m_internalQueueDbeFunctor
	Function object called when an internal queue dropped a packet before enqueue. More...

QueueSize	m_maxSize
	max queue size More...

TracedValue< uint32_t >	m_nBytes
	Number of bytes in the queue. More...

TracedValue< uint32_t >	m_nPackets
	Number of packets in the queue. More...

bool	m_peeked
	A packet was dequeued because Peek was called. More...

bool	m_prohibitChangeMode
	True if changing mode is prohibited. More...

std::vector< Ptr< InternalQueue > >	m_queues
	Internal queues. More...

uint32_t	m_quota
	Maximum number of packets dequeued in a qdisc run. More...

Ptr< QueueDiscItem >	m_requeued
	The last packet that failed to be transmitted. More...

bool	m_running
	The queue disc is performing multiple dequeue operations. More...

SendCallback	m_send
	Callback used to send a packet to the receiving object. More...

QueueDiscSizePolicy	m_sizePolicy
	The queue disc size policy. More...

TracedCallback< Time >	m_sojourn
	Sojourn time of the latest dequeued packet. More...

Stats	m_stats
	The collected statistics. More...

TracedCallback< Ptr< const QueueDiscItem > >	m_traceDequeue
	Traced callback: fired when a packet is dequeued. More...

TracedCallback< Ptr< const QueueDiscItem > >	m_traceDrop
	Traced callback: fired when a packet is dropped. More...

TracedCallback< Ptr< const QueueDiscItem >, const char * >	m_traceDropAfterDequeue
	Traced callback: fired when a packet is dropped after dequeue. More...

TracedCallback< Ptr< const QueueDiscItem >, const char * >	m_traceDropBeforeEnqueue
	Traced callback: fired when a packet is dropped before enqueue. More...

TracedCallback< Ptr< const QueueDiscItem > >	m_traceEnqueue
	Traced callback: fired when a packet is enqueued. More...

TracedCallback< Ptr< const QueueDiscItem >, const char * >	m_traceMark
	Traced callback: fired when a packet is marked. More...

TracedCallback< Ptr< const QueueDiscItem > >	m_traceRequeue
	Traced callback: fired when a packet is requeued. More...

Static Private Attributes
static const uint32_t	DEFAULT_QUOTA = 64
	Default quota (as in /proc/sys/net/core/dev_weight) More...

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

Detailed Description

QueueDisc is an abstract base class providing the interface and implementing the operations common to all the queueing disciplines.

Child classes need to implement the methods used to enqueue a packet (DoEnqueue), dequeue a single packet (DoDequeue), get a copy of the next packet to extract (DoPeek), check whether the current configuration is correct (CheckConfig).

As in Linux, a queue disc may contain distinct elements:

queues, which actually store the packets waiting for transmission
classes, which allow to reserve a different treatment to different packets
filters, which determine the queue or class which a packet is destined to

Notice that a child queue disc must be attached to every class and a packet filter is only able to classify packets of a single protocol. Also, while in Linux some queue discs (e.g., fq-codel) use an internal classifier and do not make use of packet filters, in ns-3 every queue disc including multiple queues or multiple classes needs an external filter to classify packets (this is to avoid having the traffic-control module depend on other modules such as internet).

Queue disc configuration vary from queue disc to queue disc. A typical taxonomy divides queue discs in classful (i.e., support classes) and classless (i.e., do not support classes). More recently, after the appearance of multi-queue devices (such as Wifi), some multi-queue aware queue discs have been introduced. Multi-queue aware queue discs handle as many queues (or queue discs – without using classes) as the number of transmission queues used by the device on which the queue disc is installed. An attempt is made, also, to enqueue each packet in the "same" queue both within the queue disc and within the device.

The traffic control layer interacts with a queue disc in a simple manner: after requesting to enqueue a packet, the traffic control layer requests the qdisc to "run", i.e., to dequeue a set of packets, until a predefined number ("quota") of packets is dequeued or the netdevice stops the queue disc. A netdevice shall stop the queue disc when its transmission queue does not have room for another packet. Also, a netdevice shall wake the queue disc when it detects that there is room for another packet in its transmission queue, but the transmission queue is stopped. Waking a queue disc is equivalent to make it run.

Every queue disc collects statistics about the total number of packets/bytes received from the upper layers (in case of root queue disc) or from the parent queue disc (in case of child queue disc), enqueued, dequeued, requeued, dropped, dropped before enqueue, dropped after dequeue, queued in the queue disc and sent to the netdevice or to the parent queue disc. Note that packets that are dequeued may be requeued, i.e., retained by the traffic control infrastructure, if the netdevice is not ready to receive them. Requeued packets are not part of the queue disc. The following identities hold:

dropped = dropped before enqueue + dropped after dequeue
received = dropped before enqueue + enqueued
queued = enqueued - dequeued
sent = dequeued - dropped after dequeue (- 1 if there is a requeued packet)

Separate counters are also kept for each possible reason to drop a packet. When a packet is dropped by an internal queue, e.g., because the queue is full, the reason is "Dropped by internal queue". When a packet is dropped by a child queue disc, the reason is "(Dropped by child queue disc) " followed by the reason why the child queue disc dropped the packet.

The QueueDisc base class provides the SojournTime trace source, which provides the sojourn time of every packet dequeued from a queue disc, including packets that are dropped or requeued after being dequeued. The sojourn time is taken when the packet is dequeued from the queue disc, hence it does not account for the additional time the packet is retained within the traffic control infrastructure in case it is requeued.

The design and implementation of this class is heavily inspired by Linux. For more details, see the traffic-control model page.

Definition at line 183 of file queue-disc.h.

Member Typedef Documentation

◆ ChildQueueDiscDropFunctor

typedef std::function<void(Ptr<const QueueDiscItem>, const char*)> ns3::QueueDisc::ChildQueueDiscDropFunctor

private

Type for the function objects notifying that a packet has been dropped by a child queue disc.

Definition at line 729 of file queue-disc.h.

◆ ChildQueueDiscMarkFunctor

typedef std::function<void(Ptr<const QueueDiscItem>, const char*)> ns3::QueueDisc::ChildQueueDiscMarkFunctor

private

Type for the function objects notifying that a packet has been marked by a child queue disc.

Definition at line 731 of file queue-disc.h.

◆ InternalQueue

typedef Queue<QueueDiscItem> ns3::QueueDisc::InternalQueue

Internal queues store QueueDiscItem objects.

Definition at line 428 of file queue-disc.h.

◆ InternalQueueDropFunctor

typedef std::function<void(Ptr<const QueueDiscItem>)> ns3::QueueDisc::InternalQueueDropFunctor

private

Type for the function objects notifying that a packet has been dropped by an internal queue.

Definition at line 727 of file queue-disc.h.

◆ SendCallback

typedef std::function<void(Ptr<QueueDiscItem>)> ns3::QueueDisc::SendCallback

Callback invoked to send a packet to the receiving object when Run is called.

Definition at line 363 of file queue-disc.h.

Member Enumeration Documentation

◆ WakeMode

enum ns3::QueueDisc::WakeMode

Used to determine whether the queue disc itself or its children must be activated when a netdevice wakes a transmission queue.

Enumerator
WAKE_ROOT
WAKE_CHILD

Definition at line 502 of file queue-disc.h.

Constructor & Destructor Documentation

◆ QueueDisc() [1/3]

ns3::QueueDisc::QueueDisc ( QueueDiscSizePolicy policy = QueueDiscSizePolicy::SINGLE_INTERNAL_QUEUE )

Constructor.

Parameters

policy the policy to handle the queue disc size

Definition at line 318 of file queue-disc.cc.

References CHILD_QUEUE_DISC_DROP, CHILD_QUEUE_DISC_MARK, DropAfterDequeue(), DropBeforeEnqueue(), INTERNAL_QUEUE_DROP, m_childQueueDiscDadFunctor, m_childQueueDiscDbeFunctor, m_childQueueDiscDropMsg, m_childQueueDiscMarkFunctor, m_childQueueDiscMarkMsg, m_internalQueueDadFunctor, m_internalQueueDbeFunctor, Mark(), NS_LOG_FUNCTION, and ns3::PeekPointer().

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◆ QueueDisc() [2/3]

ns3::QueueDisc::QueueDisc	(	QueueDiscSizePolicy	policy,
		QueueSizeUnit	unit
	)

Constructor.

Parameters

policy	the policy to handle the queue disc size
unit	The fixed operating mode of this queue disc

Definition at line 363 of file queue-disc.cc.

References m_maxSize, and m_prohibitChangeMode.

◆ ~QueueDisc()

ns3::QueueDisc::~QueueDisc ( )

override

Definition at line 370 of file queue-disc.cc.

References NS_LOG_FUNCTION.

◆ QueueDisc() [3/3]

ns3::QueueDisc::QueueDisc ( const QueueDisc & )

delete

Member Function Documentation

◆ AddInternalQueue()

void ns3::QueueDisc::AddInternalQueue ( Ptr< InternalQueue > queue )

Add an internal queue to the tail of the list of queues.

Parameters

queue the queue to be added

Definition at line 573 of file queue-disc.cc.

References m_internalQueueDadFunctor, m_internalQueueDbeFunctor, m_queues, ns3::MakeCallback(), NS_LOG_FUNCTION, PacketDequeued(), and PacketEnqueued().

Referenced by ns3::CobaltQueueDisc::CheckConfig(), ns3::CoDelQueueDisc::CheckConfig(), ns3::FifoQueueDisc::CheckConfig(), ns3::PfifoFastQueueDisc::CheckConfig(), ns3::PieQueueDisc::CheckConfig(), ns3::RedQueueDisc::CheckConfig(), TestChildQueueDisc::CheckConfig(), and ns3::QueueDiscFactory::CreateQueueDisc().

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◆ AddPacketFilter()

void ns3::QueueDisc::AddPacketFilter ( Ptr< PacketFilter > filter )

Add a packet filter to the tail of the list of filters used to classify packets.

Parameters

filter the packet filter to be added

Definition at line 604 of file queue-disc.cc.

References m_filters, and NS_LOG_FUNCTION.

Referenced by ns3::QueueDiscFactory::CreateQueueDisc().

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◆ AddQueueDiscClass()

void ns3::QueueDisc::AddQueueDiscClass ( Ptr< QueueDiscClass > qdClass )

Add a queue disc class to the tail of the list of classes.

Parameters

qdClass the queue disc class to be added

Definition at line 624 of file queue-disc.cc.

References m_childQueueDiscDadFunctor, m_childQueueDiscDbeFunctor, m_childQueueDiscMarkFunctor, m_classes, ns3::MakeCallback(), NS_ABORT_MSG_IF, NS_LOG_FUNCTION, PacketDequeued(), PacketEnqueued(), and WAKE_CHILD.

Referenced by ns3::PrioQueueDisc::CheckConfig(), ns3::TbfQueueDisc::CheckConfig(), TestParentQueueDisc::CheckConfig(), ns3::QueueDiscFactory::CreateQueueDisc(), ns3::FqCobaltQueueDisc::DoEnqueue(), ns3::FqCoDelQueueDisc::DoEnqueue(), and ns3::FqPieQueueDisc::DoEnqueue().

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◆ CheckConfig()

virtual bool ns3::QueueDisc::CheckConfig ( )

privatepure virtual

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. This method is automatically called at simulation initialization time, and it is called before the InitializeParams () method. It is appropriate to promote parameter initialization to this method if it aids in checking for correct configuration.

See also: QueueDisc::InitializeParams

Returns: true if the configuration is correct, false otherwise

Implemented in TestParentQueueDisc, TestChildQueueDisc, ns3::TbfQueueDisc, ns3::RedQueueDisc, ns3::PrioQueueDisc, ns3::PieQueueDisc, ns3::PfifoFastQueueDisc, ns3::MqQueueDisc, ns3::FqPieQueueDisc, ns3::FqCoDelQueueDisc, ns3::FqCobaltQueueDisc, ns3::FifoQueueDisc, ns3::CoDelQueueDisc, and ns3::CobaltQueueDisc.

Referenced by DoInitialize().

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◆ Classify()

int32_t ns3::QueueDisc::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.

Parameters

item	item to classify

Returns: -1 if no filter able to classify the packet has been found, the value returned by first filter found to be able to classify the packet otherwise.

Definition at line 667 of file queue-disc.cc.

References f(), m_filters, NS_LOG_FUNCTION, and ns3::PacketFilter::PF_NO_MATCH.

Referenced by ns3::FqCobaltQueueDisc::DoEnqueue(), ns3::FqCoDelQueueDisc::DoEnqueue(), ns3::FqPieQueueDisc::DoEnqueue(), and ns3::PrioQueueDisc::DoEnqueue().

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◆ Dequeue()

Ptr< QueueDiscItem > ns3::QueueDisc::Dequeue ( void )

Extract from the queue disc the packet that has been dequeued by calling Peek, if any, or call the private DoDequeue method (which must be implemented by derived classes) to dequeue a packet, otherwise.

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

Definition at line 886 of file queue-disc.cc.

References DoDequeue(), m_nBytes, m_nPackets, m_peeked, m_requeued, m_stats, NS_ASSERT, NS_LOG_FUNCTION, ns3::QueueDisc::Stats::nTotalDequeuedBytes, ns3::QueueDisc::Stats::nTotalDequeuedPackets, ns3::QueueDisc::Stats::nTotalEnqueuedBytes, ns3::QueueDisc::Stats::nTotalEnqueuedPackets, and PacketDequeued().

Referenced by DequeuePacket(), ns3::PfifoFastQueueDisc::DoDequeue(), ns3::PrioQueueDisc::DoDequeue(), DoPeek(), and QueueDiscTracesTestCase::DoRun().

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◆ DequeuePacket()

Ptr< QueueDiscItem > ns3::QueueDisc::DequeuePacket ( )

private

Modelled after the Linux function dequeue_skb (net/sched/sch_generic.c)

Returns: the requeued packet, if any, or the packet dequeued by the queue disc, otherwise.

Definition at line 1000 of file queue-disc.cc.

References Dequeue(), m_devQueueIface, m_peeked, m_requeued, NS_LOG_FUNCTION, and PacketDequeued().

Referenced by Restart().

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◆ DoDequeue()

virtual Ptr<QueueDiscItem> ns3::QueueDisc::DoDequeue ( )

privatepure virtual

This function actually extracts a packet from the queue disc.

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

Implemented in TestParentQueueDisc, TestChildQueueDisc, ns3::TbfQueueDisc, ns3::RedQueueDisc, ns3::PrioQueueDisc, ns3::PieQueueDisc, ns3::PfifoFastQueueDisc, ns3::MqQueueDisc, ns3::FqPieQueueDisc, ns3::FqCoDelQueueDisc, ns3::FqCobaltQueueDisc, ns3::FifoQueueDisc, ns3::CoDelQueueDisc, and ns3::CobaltQueueDisc.

Referenced by Dequeue().

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◆ DoDispose()

void ns3::QueueDisc::DoDispose ( void )

overrideprotectedvirtual

Dispose of the object.

Reimplemented from ns3::Object.

Reimplemented in ns3::TbfQueueDisc, and ns3::RedQueueDisc.

Definition at line 376 of file queue-disc.cc.

References ns3::Object::DoDispose(), m_childQueueDiscDadFunctor, m_childQueueDiscDbeFunctor, m_classes, m_devQueueIface, m_filters, m_internalQueueDadFunctor, m_internalQueueDbeFunctor, m_queues, m_requeued, m_send, and NS_LOG_FUNCTION.

Referenced by ns3::CobaltQueueDisc::DoDispose(), ns3::PieQueueDisc::DoDispose(), ns3::RedQueueDisc::DoDispose(), and ns3::TbfQueueDisc::DoDispose().

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◆ DoEnqueue()

virtual bool ns3::QueueDisc::DoEnqueue ( Ptr< QueueDiscItem > item )

privatepure virtual

This function actually enqueues a packet into the queue disc.

Parameters

item	item to enqueue

Returns: True if the operation was successful; false otherwise

Implemented in TestParentQueueDisc, TestChildQueueDisc, ns3::TbfQueueDisc, ns3::RedQueueDisc, ns3::PrioQueueDisc, ns3::PieQueueDisc, ns3::PfifoFastQueueDisc, ns3::MqQueueDisc, ns3::FqPieQueueDisc, ns3::FqCoDelQueueDisc, ns3::FqCobaltQueueDisc, ns3::FifoQueueDisc, ns3::CoDelQueueDisc, and ns3::CobaltQueueDisc.

Referenced by Enqueue().

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◆ DoInitialize()

void ns3::QueueDisc::DoInitialize ( void )

overrideprotectedvirtual

Check whether the configuration is correct and initialize parameters.

This method is not virtual to prevent subclasses from redefining it. Subclasses must instead provide the implementation of the CheckConfig and InitializeParams methods (which are called by this method).

See also: QueueDisc::InitializeParams; QueueDisc::CheckConfig

Reimplemented from ns3::Object.

Definition at line 393 of file queue-disc.cc.

References CheckConfig(), ns3::Object::DoInitialize(), InitializeParams(), m_classes, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

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◆ DoPeek()

Ptr< const QueueDiscItem > ns3::QueueDisc::DoPeek ( )

privatevirtual

Return a copy of the next packet the queue disc will extract.

The implementation of this method is based on the qdisc_peek_dequeued function of the Linux kernel, which dequeues a packet and retains it in the queue disc as a requeued packet. The packet is not traced as requeued, nor is the total count of requeued packets increased. The packet is still considered to be part of the queue disc and the dequeue trace is fired when Dequeue is called and the packet is actually extracted from the queue disc.

This approach is especially recommended for queue discs for which it is not obvious what is the next packet that will be dequeued (e.g., queue discs having multiple internal queues or child queue discs or queue discs that drop packets after dequeue). Subclasses can however provide their own implementation of this method that overrides the default one.

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

Reimplemented in ns3::RedQueueDisc, ns3::PrioQueueDisc, ns3::PfifoFastQueueDisc, ns3::MqQueueDisc, ns3::FifoQueueDisc, and ns3::CobaltQueueDisc.

Definition at line 927 of file queue-disc.cc.

References Dequeue(), m_peeked, m_requeued, and NS_LOG_FUNCTION.

Referenced by Peek().

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◆ DropAfterDequeue()

void ns3::QueueDisc::DropAfterDequeue	(	Ptr< const QueueDiscItem >	item,
		const char *	reason
	)

protected

Perform the actions required when the queue disc is notified of a packet dropped after dequeue.

Parameters

item	item that was dropped
reason	the reason why the item was dropped This method must be called by subclasses to record that a packet was dropped after dequeue for the specified reason

Definition at line 759 of file queue-disc.cc.

References m_peeked, m_stats, m_traceDrop, m_traceDropAfterDequeue, ns3::QueueDisc::Stats::nDroppedBytesAfterDequeue, ns3::QueueDisc::Stats::nDroppedPacketsAfterDequeue, NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::QueueDisc::Stats::nTotalDroppedBytes, ns3::QueueDisc::Stats::nTotalDroppedBytesAfterDequeue, ns3::QueueDisc::Stats::nTotalDroppedPackets, ns3::QueueDisc::Stats::nTotalDroppedPacketsAfterDequeue, and PacketDequeued().

Referenced by QueueDisc(), ns3::CobaltQueueDisc::DoDequeue(), ns3::CoDelQueueDisc::DoDequeue(), TestChildQueueDisc::DoDequeue(), ns3::FqCobaltQueueDisc::FqCobaltDrop(), ns3::FqCoDelQueueDisc::FqCoDelDrop(), and ns3::FqPieQueueDisc::FqPieDrop().

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◆ DropBeforeEnqueue()

void ns3::QueueDisc::DropBeforeEnqueue	(	Ptr< const QueueDiscItem >	item,
		const char *	reason
	)

protected

Perform the actions required when the queue disc is notified of a packet dropped before enqueue.

Parameters

item	item that was dropped
reason	the reason why the item was dropped This method must be called by subclasses to record that a packet was dropped before enqueue for the specified reason

Definition at line 720 of file queue-disc.cc.

References m_stats, m_traceDrop, m_traceDropBeforeEnqueue, ns3::QueueDisc::Stats::nDroppedBytesBeforeEnqueue, ns3::QueueDisc::Stats::nDroppedPacketsBeforeEnqueue, NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::QueueDisc::Stats::nTotalDroppedBytes, ns3::QueueDisc::Stats::nTotalDroppedBytesBeforeEnqueue, ns3::QueueDisc::Stats::nTotalDroppedPackets, and ns3::QueueDisc::Stats::nTotalDroppedPacketsBeforeEnqueue.

Referenced by QueueDisc(), ns3::CobaltQueueDisc::DoEnqueue(), ns3::CoDelQueueDisc::DoEnqueue(), ns3::FifoQueueDisc::DoEnqueue(), ns3::FqCobaltQueueDisc::DoEnqueue(), ns3::FqCoDelQueueDisc::DoEnqueue(), ns3::FqPieQueueDisc::DoEnqueue(), ns3::PfifoFastQueueDisc::DoEnqueue(), ns3::PieQueueDisc::DoEnqueue(), ns3::RedQueueDisc::DoEnqueue(), and TestChildQueueDisc::DoEnqueue().

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◆ Enqueue()

bool ns3::QueueDisc::Enqueue ( Ptr< QueueDiscItem > item )

Pass a packet to store to the queue discipline.

This function only updates the statistics and calls the (private) DoEnqueue function, which must be implemented by derived classes.

Parameters

item	item to enqueue

Returns: True if the operation was successful; false otherwise

Definition at line 851 of file queue-disc.cc.

References DoEnqueue(), m_stats, ns3::Simulator::Now(), NS_ASSERT, NS_LOG_FUNCTION, ns3::QueueDisc::Stats::nTotalDroppedBytesBeforeEnqueue, ns3::QueueDisc::Stats::nTotalDroppedPacketsBeforeEnqueue, ns3::QueueDisc::Stats::nTotalEnqueuedBytes, ns3::QueueDisc::Stats::nTotalEnqueuedPackets, ns3::QueueDisc::Stats::nTotalReceivedBytes, and ns3::QueueDisc::Stats::nTotalReceivedPackets.

Referenced by QueueDiscTracesTestCase::DoRun(), and ns3::TrafficControlLayer::Send().

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◆ GetCurrentSize()

QueueSize ns3::QueueDisc::GetCurrentSize ( ) const

Get the current size of the queue disc in bytes, if operating in bytes mode, or packets, otherwise.

Do not call this method if the queue disc size is not limited.

Returns: The queue disc size in bytes or packets.

Definition at line 515 of file queue-disc.cc.

References ns3::BYTES, GetMaxSize(), m_nBytes, m_nPackets, NS_ABORT_MSG, NS_LOG_FUNCTION, and ns3::PACKETS.

Referenced by CheckQueueDiscSize(), CheckQueueSize(), ns3::CobaltQueueDisc::DoEnqueue(), ns3::CoDelQueueDisc::DoEnqueue(), ns3::FifoQueueDisc::DoEnqueue(), ns3::FqCobaltQueueDisc::DoEnqueue(), ns3::FqCoDelQueueDisc::DoEnqueue(), ns3::FqPieQueueDisc::DoEnqueue(), ns3::PfifoFastQueueDisc::DoEnqueue(), and ns3::PieQueueDisc::DoEnqueue().

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◆ GetInternalQueue()

Ptr< QueueDisc::InternalQueue > ns3::QueueDisc::GetInternalQueue ( std::size_t i ) const

Get the i-th internal queue.

Parameters

i	the index of the queue

Returns: the i-th internal queue.

Definition at line 591 of file queue-disc.cc.

References m_queues, and NS_ASSERT.

Referenced by ns3::PieQueueDisc::CalculateP(), ns3::PfifoFastQueueDisc::CheckConfig(), ns3::CobaltQueueDisc::DoDequeue(), ns3::CoDelQueueDisc::DoDequeue(), ns3::FifoQueueDisc::DoDequeue(), ns3::PfifoFastQueueDisc::DoDequeue(), ns3::PieQueueDisc::DoDequeue(), ns3::RedQueueDisc::DoDequeue(), TestChildQueueDisc::DoDequeue(), ns3::CobaltQueueDisc::DoEnqueue(), ns3::CoDelQueueDisc::DoEnqueue(), ns3::FifoQueueDisc::DoEnqueue(), ns3::PfifoFastQueueDisc::DoEnqueue(), ns3::PieQueueDisc::DoEnqueue(), ns3::RedQueueDisc::DoEnqueue(), TestChildQueueDisc::DoEnqueue(), ns3::CobaltQueueDisc::DoPeek(), ns3::FifoQueueDisc::DoPeek(), ns3::PfifoFastQueueDisc::DoPeek(), ns3::RedQueueDisc::DoPeek(), ns3::FqCobaltQueueDisc::FqCobaltDrop(), ns3::FqCoDelQueueDisc::FqCoDelDrop(), ns3::FqPieQueueDisc::FqPieDrop(), GetMaxSize(), ns3::CoDelQueueDisc::OkToDrop(), and SetMaxSize().

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◆ GetMaxSize()

QueueSize ns3::QueueDisc::GetMaxSize ( ) const

Get the maximum size of the queue disc.

Returns: the maximum size of the queue disc.

Definition at line 446 of file queue-disc.cc.

References GetInternalQueue(), GetNInternalQueues(), GetNQueueDiscClasses(), GetQueueDiscClass(), m_maxSize, m_sizePolicy, ns3::MULTIPLE_QUEUES, ns3::NO_LIMITS, NS_FATAL_ERROR, NS_LOG_FUNCTION, ns3::SINGLE_CHILD_QUEUE_DISC, and ns3::SINGLE_INTERNAL_QUEUE.

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◆ GetNBytes()

uint32_t ns3::QueueDisc::GetNBytes ( ) const

Get the amount of bytes stored by the queue disc.

Returns: the amount of bytes stored by the queue disc.

The requeued packet, if any, is counted.

Definition at line 439 of file queue-disc.cc.

References m_nBytes, and NS_LOG_FUNCTION.

Referenced by ns3::PieQueueDisc::CalculateP(), QueueDiscTracesTestCase::CheckQueued(), ns3::CobaltQueueDisc::DoDequeue(), ns3::CoDelQueueDisc::DoDequeue(), ns3::PieQueueDisc::DoDequeue(), ns3::RedQueueDisc::DoDequeue(), ns3::TbfQueueDisc::DoDequeue(), ns3::CobaltQueueDisc::DoEnqueue(), ns3::CoDelQueueDisc::DoEnqueue(), ns3::FifoQueueDisc::DoEnqueue(), ns3::PieQueueDisc::DoEnqueue(), ns3::RedQueueDisc::DoEnqueue(), ns3::TbfQueueDisc::DoEnqueue(), ns3::CobaltQueueDisc::DoPeek(), ns3::RedQueueDisc::DoPeek(), ns3::FqCobaltQueueDisc::FqCobaltDrop(), ns3::FqCoDelQueueDisc::FqCoDelDrop(), ns3::FqPieQueueDisc::FqPieDrop(), ns3::CoDelQueueDisc::OkToDrop(), and TcPacketsInQueue().

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◆ GetNetDeviceQueueInterface()

Ptr< NetDeviceQueueInterface > ns3::QueueDisc::GetNetDeviceQueueInterface ( ) const

Returns: the NetDeviceQueueInterface aggregated to the receiving object.

Get the pointer to the NetDeviceQueueInterface object aggregated to the object receiving the packets dequeued from this queue disc.

Definition at line 538 of file queue-disc.cc.

References m_devQueueIface, and NS_LOG_FUNCTION.

Referenced by ns3::FqCobaltQueueDisc::CheckConfig(), ns3::FqCoDelQueueDisc::CheckConfig(), ns3::FqPieQueueDisc::CheckConfig(), and ns3::TbfQueueDisc::CheckConfig().

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◆ GetNInternalQueues()

std::size_t ns3::QueueDisc::GetNInternalQueues ( ) const

Get the number of internal queues.

Returns: the number of internal queues.

Definition at line 598 of file queue-disc.cc.

References m_queues.

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◆ GetNPacketFilters()

std::size_t ns3::QueueDisc::GetNPacketFilters ( ) const

Get the number of packet filters.

Returns: the number of packet filters.

Definition at line 618 of file queue-disc.cc.

References m_filters.

Referenced by ns3::CobaltQueueDisc::CheckConfig(), ns3::CoDelQueueDisc::CheckConfig(), ns3::FifoQueueDisc::CheckConfig(), ns3::MqQueueDisc::CheckConfig(), ns3::PfifoFastQueueDisc::CheckConfig(), ns3::PieQueueDisc::CheckConfig(), ns3::RedQueueDisc::CheckConfig(), ns3::TbfQueueDisc::CheckConfig(), ns3::FqCobaltQueueDisc::DoEnqueue(), ns3::FqCoDelQueueDisc::DoEnqueue(), and ns3::FqPieQueueDisc::DoEnqueue().

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◆ GetNPackets()

uint32_t ns3::QueueDisc::GetNPackets ( ) const

Get the number of packets stored by the queue disc.

Returns: the number of packets stored by the queue disc.

The requeued packet, if any, is counted.

Definition at line 432 of file queue-disc.cc.

References m_nPackets, and NS_LOG_FUNCTION.

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◆ GetNQueueDiscClasses()

std::size_t ns3::QueueDisc::GetNQueueDiscClasses ( ) const

Get the number of queue disc classes.

Returns: the number of queue disc classes.

Definition at line 661 of file queue-disc.cc.

References m_classes.

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◆ GetPacketFilter()

Ptr< PacketFilter > ns3::QueueDisc::GetPacketFilter ( std::size_t i ) const

Get the i-th packet filter.

Parameters

i	the index of the packet filter

Returns: the i-th packet filter.

Definition at line 611 of file queue-disc.cc.

References m_filters, and NS_ASSERT.

◆ GetQueueDiscClass()

Ptr< QueueDiscClass > ns3::QueueDisc::GetQueueDiscClass ( std::size_t i ) const

Get the i-th queue disc class.

Parameters

i	the index of the queue disc class

Returns: the i-th queue disc class.

Definition at line 654 of file queue-disc.cc.

References m_classes, and NS_ASSERT.

Referenced by ns3::PrioQueueDisc::DoDequeue(), ns3::TbfQueueDisc::DoDequeue(), TestParentQueueDisc::DoDequeue(), ns3::FqCobaltQueueDisc::DoEnqueue(), ns3::FqCoDelQueueDisc::DoEnqueue(), ns3::FqPieQueueDisc::DoEnqueue(), ns3::PrioQueueDisc::DoEnqueue(), ns3::TbfQueueDisc::DoEnqueue(), TestParentQueueDisc::DoEnqueue(), ns3::PrioQueueDisc::DoPeek(), WifiAcMappingTest::DoRun(), QueueDiscTracesTestCase::DoRun(), ns3::FqCobaltQueueDisc::FqCobaltDrop(), ns3::FqCoDelQueueDisc::FqCoDelDrop(), ns3::FqPieQueueDisc::FqPieDrop(), GetMaxSize(), ns3::TrafficControlLayer::ScanDevices(), ns3::FqCobaltQueueDisc::SetAssociativeHash(), ns3::FqCoDelQueueDisc::SetAssociativeHash(), ns3::FqPieQueueDisc::SetAssociativeHash(), and SetMaxSize().

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◆ GetQuota()

uint32_t ns3::QueueDisc::GetQuota ( ) const

virtual

Get the maximum number of dequeue operations following a packet enqueue.

Returns: the maximum number of dequeue operations following a packet enqueue.

Definition at line 566 of file queue-disc.cc.

References m_quota, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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◆ GetSendCallback()

QueueDisc::SendCallback ns3::QueueDisc::GetSendCallback ( ) const

Returns: the callback to send a packet to the receiving object.

Get the callback used by the Transmit method (called eventually by the Run method) to send a packet to the receiving object.

Definition at line 552 of file queue-disc.cc.

References m_send, and NS_LOG_FUNCTION.

◆ GetStats()

const QueueDisc::Stats & ns3::QueueDisc::GetStats ( )

Retrieve all the collected statistics.

Returns: the collected statistics.

Definition at line 412 of file queue-disc.cc.

Referenced by QueueDiscTracesTestCase::CheckDroppedAfterDequeue(), QueueDiscTracesTestCase::CheckDroppedBeforeEnqueue(), and TcPacketsInQueue().

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◆ GetTypeId()

TypeId ns3::QueueDisc::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

Definition at line 249 of file queue-disc.cc.

References DEFAULT_QUOTA, GetQuota(), m_classes, m_filters, m_nBytes, m_nPackets, m_queues, m_sojourn, m_traceDequeue, m_traceDrop, m_traceDropAfterDequeue, m_traceDropBeforeEnqueue, m_traceEnqueue, m_traceMark, m_traceRequeue, ns3::MakeObjectVectorAccessor(), ns3::MakeTraceSourceAccessor(), ns3::MakeUintegerAccessor(), ns3::TypeId::SetParent(), and SetQuota().

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◆ GetWakeMode()

QueueDisc::WakeMode ns3::QueueDisc::GetWakeMode ( ) const

virtual

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.

The implementation of this method for the base class returns WAKE_ROOT, i.e., the root queue disc is activated. Subclasses implementing queue discs adopting a different strategy (e.g., multi-queue aware queue discs such as mq) have to redefine this method.

Returns: the wake mode adopted by this queue disc.

Reimplemented in ns3::MqQueueDisc.

Definition at line 680 of file queue-disc.cc.

References WAKE_ROOT.

◆ InitializeParams()

virtual void ns3::QueueDisc::InitializeParams ( )

privatepure virtual

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

This method is automatically called at simulation initialization time, after the CheckConfig() method has been called.

See also: QueueDisc::CheckConfig

Implemented in TestParentQueueDisc, TestChildQueueDisc, ns3::TbfQueueDisc, ns3::RedQueueDisc, ns3::PrioQueueDisc, ns3::PieQueueDisc, ns3::PfifoFastQueueDisc, ns3::MqQueueDisc, ns3::FqPieQueueDisc, ns3::FqCoDelQueueDisc, ns3::FqCobaltQueueDisc, ns3::FifoQueueDisc, ns3::CoDelQueueDisc, and ns3::CobaltQueueDisc.

Referenced by DoInitialize().

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◆ Mark()

bool ns3::QueueDisc::Mark	(	Ptr< QueueDiscItem >	item,
		const char *	reason
	)

protected

Marks the given packet and, if successful, updates the counters associated with the given reason.

Parameters

item	item that has to be marked
reason	the reason why the item has to be marked

Returns: true if the item was successfully marked, false otherwise

Definition at line 809 of file queue-disc.cc.

References m_stats, m_traceMark, ns3::QueueDisc::Stats::nMarkedBytes, ns3::QueueDisc::Stats::nMarkedPackets, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::QueueDisc::Stats::nTotalMarkedBytes, and ns3::QueueDisc::Stats::nTotalMarkedPackets.

Referenced by QueueDisc(), ns3::CobaltQueueDisc::CobaltShouldDrop(), ns3::CoDelQueueDisc::DoDequeue(), ns3::PieQueueDisc::DoDequeue(), ns3::PieQueueDisc::DoEnqueue(), and ns3::RedQueueDisc::DoEnqueue().

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◆ operator=()

QueueDisc& ns3::QueueDisc::operator= ( const QueueDisc & )

delete

◆ PacketDequeued()

void ns3::QueueDisc::PacketDequeued ( Ptr< const QueueDiscItem > item )

private

Perform the actions required when the queue disc is notified of a packet dequeue.

Parameters

item	item that was dequeued

Definition at line 698 of file queue-disc.cc.

References m_nBytes, m_nPackets, m_peeked, m_sojourn, m_stats, m_traceDequeue, ns3::Simulator::Now(), NS_LOG_LOGIC, ns3::QueueDisc::Stats::nTotalDequeuedBytes, and ns3::QueueDisc::Stats::nTotalDequeuedPackets.

Referenced by AddInternalQueue(), AddQueueDiscClass(), Dequeue(), DequeuePacket(), and DropAfterDequeue().

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◆ PacketEnqueued()

void ns3::QueueDisc::PacketEnqueued ( Ptr< const QueueDiscItem > item )

private

Perform the actions required when the queue disc is notified of a packet enqueue.

Parameters

item	item that was enqueued

Definition at line 686 of file queue-disc.cc.

References m_nBytes, m_nPackets, m_stats, m_traceEnqueue, NS_LOG_LOGIC, ns3::QueueDisc::Stats::nTotalEnqueuedBytes, and ns3::QueueDisc::Stats::nTotalEnqueuedPackets.

Referenced by AddInternalQueue(), and AddQueueDiscClass().

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◆ Peek()

Ptr< const QueueDiscItem > ns3::QueueDisc::Peek ( )

Get a copy of the next packet the queue discipline will extract.

This function only calls the (private) DoPeek function. This base class provides a default implementation of DoPeek, which dequeues the next packet but retains it into the queue disc.

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

Definition at line 920 of file queue-disc.cc.

References DoPeek(), and NS_LOG_FUNCTION.

Referenced by ns3::PfifoFastQueueDisc::DoPeek(), ns3::PrioQueueDisc::DoPeek(), and QueueDiscTracesTestCase::DoRun().

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◆ Requeue()

void ns3::QueueDisc::Requeue ( Ptr< QueueDiscItem > item )

private

Modelled after the Linux function dev_requeue_skb (net/sched/sch_generic.c) Requeues a packet whose transmission failed.

Parameters

item	the packet to requeue

Todo:: netif_schedule (q);

Definition at line 1050 of file queue-disc.cc.

References m_requeued, m_stats, m_traceRequeue, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::QueueDisc::Stats::nTotalRequeuedBytes, and ns3::QueueDisc::Stats::nTotalRequeuedPackets.

Referenced by Transmit().

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◆ Restart()

bool ns3::QueueDisc::Restart ( )

private

Modelled after the Linux function qdisc_restart (net/sched/sch_generic.c) Dequeue a packet (by calling DequeuePacket) and send it to the device (by calling Transmit).

Returns: true if a packet is successfully sent to the device.

Definition at line 986 of file queue-disc.cc.

References DequeuePacket(), NS_LOG_FUNCTION, NS_LOG_LOGIC, and Transmit().

Referenced by Run().

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◆ Run()

void ns3::QueueDisc::Run ( )

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.

Todo:: netif_schedule (q);

Definition at line 945 of file queue-disc.cc.

References m_quota, NS_LOG_FUNCTION, Restart(), RunBegin(), and RunEnd().

Referenced by ns3::TbfQueueDisc::DoDequeue(), ns3::TrafficControlLayer::ScanDevices(), and ns3::TrafficControlLayer::Send().

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◆ RunBegin()

bool ns3::QueueDisc::RunBegin ( )

private

Modelled after the Linux function qdisc_run_begin (include/net/sch_generic.h).

Returns: false if the qdisc is already running; otherwise, set the qdisc as running and return true.

Definition at line 966 of file queue-disc.cc.

References m_running, and NS_LOG_FUNCTION.

Referenced by Run().

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◆ RunEnd()

void ns3::QueueDisc::RunEnd ( )

private

Modelled after the Linux function qdisc_run_end (include/net/sch_generic.h).

Set the qdisc as not running.

Definition at line 979 of file queue-disc.cc.

References m_running, and NS_LOG_FUNCTION.

Referenced by Run().

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◆ SetMaxSize()

bool ns3::QueueDisc::SetMaxSize ( QueueSize size )

Set the maximum size of the queue disc.

Trying to set a null size has no effect.

Parameters

size	the maximum size.

Returns: true if setting the size succeeded, false otherwise.

Definition at line 474 of file queue-disc.cc.

References GetInternalQueue(), GetNInternalQueues(), GetNQueueDiscClasses(), GetQueueDiscClass(), ns3::QueueSize::GetUnit(), ns3::QueueSize::GetValue(), m_maxSize, m_prohibitChangeMode, m_sizePolicy, ns3::MULTIPLE_QUEUES, ns3::NO_LIMITS, NS_FATAL_ERROR, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::SINGLE_CHILD_QUEUE_DISC, and ns3::SINGLE_INTERNAL_QUEUE.

Referenced by ns3::TbfQueueDisc::CheckConfig(), ns3::CobaltQueueDisc::GetTypeId(), ns3::CoDelQueueDisc::GetTypeId(), ns3::FifoQueueDisc::GetTypeId(), ns3::FqCobaltQueueDisc::GetTypeId(), ns3::FqCoDelQueueDisc::GetTypeId(), ns3::FqPieQueueDisc::GetTypeId(), ns3::PfifoFastQueueDisc::GetTypeId(), ns3::PieQueueDisc::GetTypeId(), ns3::RedQueueDisc::GetTypeId(), and ns3::TbfQueueDisc::GetTypeId().

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◆ SetNetDeviceQueueInterface()

void ns3::QueueDisc::SetNetDeviceQueueInterface ( Ptr< NetDeviceQueueInterface > ndqi )

Parameters

ndqi	the NetDeviceQueueInterface aggregated to the receiving object.

Set the pointer to the NetDeviceQueueInterface object aggregated to the object receiving the packets dequeued from this queue disc.

Definition at line 531 of file queue-disc.cc.

References m_devQueueIface, and NS_LOG_FUNCTION.

◆ SetQuota()

void ns3::QueueDisc::SetQuota ( const uint32_t quota )

virtual

Set the maximum number of dequeue operations following a packet enqueue.

Parameters

quota the maximum number of dequeue operations following a packet enqueue.

Definition at line 559 of file queue-disc.cc.

References m_quota, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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◆ SetSendCallback()

void ns3::QueueDisc::SetSendCallback ( SendCallback func )

Parameters

func	the callback to send a packet to the receiving object.

Set the callback used by the Transmit method (called eventually by the Run method) to send a packet to the receiving object.

Definition at line 545 of file queue-disc.cc.

References m_send, and NS_LOG_FUNCTION.

◆ Transmit()

bool ns3::QueueDisc::Transmit ( Ptr< QueueDiscItem > item )

private

Modelled after the Linux function sch_direct_xmit (net/sched/sch_generic.c) Sends a packet to the device if the device queue is not stopped, and requeues it otherwise.

Parameters

item	the packet to transmit

Returns: true if the device queue is not stopped and the queue disc is not empty

Definition at line 1064 of file queue-disc.cc.

References GetNPackets(), m_devQueueIface, m_send, NS_ASSERT_MSG, NS_LOG_FUNCTION, and Requeue().

Referenced by Restart().

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Member Data Documentation

◆ CHILD_QUEUE_DISC_DROP

constexpr const char* ns3::QueueDisc::CHILD_QUEUE_DISC_DROP

staticconstexpr

Initial value:

=

"(Dropped by child queue disc) "

Packet dropped by a child queue disc.

Definition at line 524 of file queue-disc.h.

Referenced by QueueDisc().

◆ CHILD_QUEUE_DISC_MARK

constexpr const char* ns3::QueueDisc::CHILD_QUEUE_DISC_MARK

staticconstexpr

Initial value:

=

"(Marked by child queue disc) "

Packet marked by a child queue disc.

Definition at line 526 of file queue-disc.h.

Referenced by QueueDisc().

◆ DEFAULT_QUOTA

const uint32_t ns3::QueueDisc::DEFAULT_QUOTA = 64

staticprivate

Default quota (as in /proc/sys/net/core/dev_weight)

Definition at line 688 of file queue-disc.h.

Referenced by GetTypeId().

◆ INTERNAL_QUEUE_DROP

constexpr const char* ns3::QueueDisc::INTERNAL_QUEUE_DROP

staticconstexpr

Initial value:

=

"Dropped by internal queue"

Packet dropped by an internal queue.

Definition at line 522 of file queue-disc.h.

Referenced by QueueDisc().

◆ m_childQueueDiscDadFunctor

ChildQueueDiscDropFunctor ns3::QueueDisc::m_childQueueDiscDadFunctor

private

Function object called when a child queue disc dropped a packet after dequeue.

Definition at line 740 of file queue-disc.h.

Referenced by QueueDisc(), AddQueueDiscClass(), and DoDispose().

◆ m_childQueueDiscDbeFunctor

ChildQueueDiscDropFunctor ns3::QueueDisc::m_childQueueDiscDbeFunctor

private

Function object called when a child queue disc dropped a packet before enqueue.

Definition at line 738 of file queue-disc.h.

Referenced by QueueDisc(), AddQueueDiscClass(), and DoDispose().

◆ m_childQueueDiscDropMsg

std::string ns3::QueueDisc::m_childQueueDiscDropMsg

private

Reason why a packet was dropped by a child queue disc.

Definition at line 706 of file queue-disc.h.

Referenced by QueueDisc().

◆ m_childQueueDiscMarkFunctor

ChildQueueDiscMarkFunctor ns3::QueueDisc::m_childQueueDiscMarkFunctor

private

Function object called when a child queue disc marked a packet.

Definition at line 742 of file queue-disc.h.

Referenced by QueueDisc(), and AddQueueDiscClass().

◆ m_childQueueDiscMarkMsg

std::string ns3::QueueDisc::m_childQueueDiscMarkMsg

private

Reason why a packet was marked by a child queue disc.

Definition at line 707 of file queue-disc.h.

Referenced by QueueDisc().

◆ m_classes

std::vector<Ptr<QueueDiscClass> > ns3::QueueDisc::m_classes

private

Classes.

Definition at line 692 of file queue-disc.h.

Referenced by AddQueueDiscClass(), DoDispose(), DoInitialize(), GetNQueueDiscClasses(), GetQueueDiscClass(), and GetTypeId().

◆ m_devQueueIface

Ptr<NetDeviceQueueInterface> ns3::QueueDisc::m_devQueueIface

private

NetDevice queue interface.

Definition at line 701 of file queue-disc.h.

Referenced by DequeuePacket(), DoDispose(), GetNetDeviceQueueInterface(), SetNetDeviceQueueInterface(), and Transmit().

◆ m_filters

std::vector<Ptr<PacketFilter> > ns3::QueueDisc::m_filters

private

Packet filters.

Definition at line 691 of file queue-disc.h.

Referenced by AddPacketFilter(), Classify(), DoDispose(), GetNPacketFilters(), GetPacketFilter(), and GetTypeId().

◆ m_internalQueueDadFunctor

InternalQueueDropFunctor ns3::QueueDisc::m_internalQueueDadFunctor

private

Function object called when an internal queue dropped a packet after dequeue.

Definition at line 736 of file queue-disc.h.

Referenced by QueueDisc(), AddInternalQueue(), and DoDispose().

◆ m_internalQueueDbeFunctor

InternalQueueDropFunctor ns3::QueueDisc::m_internalQueueDbeFunctor

private

Function object called when an internal queue dropped a packet before enqueue.

Definition at line 734 of file queue-disc.h.

Referenced by QueueDisc(), AddInternalQueue(), and DoDispose().

◆ m_maxSize

QueueSize ns3::QueueDisc::m_maxSize

private

max queue size

Definition at line 697 of file queue-disc.h.

Referenced by QueueDisc(), GetMaxSize(), and SetMaxSize().

◆ m_nBytes

TracedValue<uint32_t> ns3::QueueDisc::m_nBytes

private

Number of bytes in the queue.

Definition at line 695 of file queue-disc.h.

Referenced by Dequeue(), GetCurrentSize(), GetNBytes(), GetTypeId(), PacketDequeued(), and PacketEnqueued().

◆ m_nPackets

TracedValue<uint32_t> ns3::QueueDisc::m_nPackets

private

Number of packets in the queue.

Definition at line 694 of file queue-disc.h.

Referenced by Dequeue(), GetCurrentSize(), GetNPackets(), GetTypeId(), PacketDequeued(), and PacketEnqueued().

◆ m_peeked

bool ns3::QueueDisc::m_peeked

private

A packet was dequeued because Peek was called.

Definition at line 705 of file queue-disc.h.

Referenced by Dequeue(), DequeuePacket(), DoPeek(), DropAfterDequeue(), and PacketDequeued().

◆ m_prohibitChangeMode

bool ns3::QueueDisc::m_prohibitChangeMode

private

True if changing mode is prohibited.

Definition at line 709 of file queue-disc.h.

Referenced by QueueDisc(), and SetMaxSize().

◆ m_queues

std::vector<Ptr<InternalQueue> > ns3::QueueDisc::m_queues

private

Internal queues.

Definition at line 690 of file queue-disc.h.

Referenced by AddInternalQueue(), DoDispose(), GetInternalQueue(), GetNInternalQueues(), and GetTypeId().

◆ m_quota

uint32_t ns3::QueueDisc::m_quota

private

Maximum number of packets dequeued in a qdisc run.

Definition at line 700 of file queue-disc.h.

Referenced by GetQuota(), Run(), and SetQuota().

◆ m_requeued

Ptr<QueueDiscItem> ns3::QueueDisc::m_requeued

private

The last packet that failed to be transmitted.

Definition at line 704 of file queue-disc.h.

Referenced by Dequeue(), DequeuePacket(), DoDispose(), DoPeek(), GetStats(), and Requeue().

◆ m_running

bool ns3::QueueDisc::m_running

private

The queue disc is performing multiple dequeue operations.

Definition at line 703 of file queue-disc.h.

Referenced by RunBegin(), and RunEnd().

◆ m_send

SendCallback ns3::QueueDisc::m_send

private

Callback used to send a packet to the receiving object.

Definition at line 702 of file queue-disc.h.

Referenced by DoDispose(), GetSendCallback(), SetSendCallback(), and Transmit().

◆ m_sizePolicy

QueueDiscSizePolicy ns3::QueueDisc::m_sizePolicy

private

The queue disc size policy.

Definition at line 708 of file queue-disc.h.

Referenced by GetMaxSize(), and SetMaxSize().

◆ m_sojourn

TracedCallback<Time> ns3::QueueDisc::m_sojourn

private

Sojourn time of the latest dequeued packet.

Definition at line 696 of file queue-disc.h.

Referenced by GetTypeId(), and PacketDequeued().

◆ m_stats

Stats ns3::QueueDisc::m_stats

private

The collected statistics.

Definition at line 699 of file queue-disc.h.

Referenced by Dequeue(), DropAfterDequeue(), DropBeforeEnqueue(), Enqueue(), GetStats(), Mark(), PacketDequeued(), PacketEnqueued(), and Requeue().

◆ m_traceDequeue

TracedCallback<Ptr<const QueueDiscItem> > ns3::QueueDisc::m_traceDequeue

private

Traced callback: fired when a packet is dequeued.

Definition at line 714 of file queue-disc.h.

Referenced by GetTypeId(), and PacketDequeued().

◆ m_traceDrop

TracedCallback<Ptr<const QueueDiscItem> > ns3::QueueDisc::m_traceDrop

private

Traced callback: fired when a packet is dropped.

Definition at line 718 of file queue-disc.h.

Referenced by DropAfterDequeue(), DropBeforeEnqueue(), and GetTypeId().

◆ m_traceDropAfterDequeue

TracedCallback<Ptr<const QueueDiscItem>, const char*> ns3::QueueDisc::m_traceDropAfterDequeue

private

Traced callback: fired when a packet is dropped after dequeue.

Definition at line 722 of file queue-disc.h.

Referenced by DropAfterDequeue(), and GetTypeId().

◆ m_traceDropBeforeEnqueue

TracedCallback<Ptr<const QueueDiscItem>, const char*> ns3::QueueDisc::m_traceDropBeforeEnqueue

private

Traced callback: fired when a packet is dropped before enqueue.

Definition at line 720 of file queue-disc.h.

Referenced by DropBeforeEnqueue(), and GetTypeId().

◆ m_traceEnqueue

TracedCallback<Ptr<const QueueDiscItem> > ns3::QueueDisc::m_traceEnqueue

private

Traced callback: fired when a packet is enqueued.

Definition at line 712 of file queue-disc.h.

Referenced by GetTypeId(), and PacketEnqueued().

◆ m_traceMark

TracedCallback<Ptr<const QueueDiscItem>, const char*> ns3::QueueDisc::m_traceMark

private

Traced callback: fired when a packet is marked.

Definition at line 724 of file queue-disc.h.

Referenced by GetTypeId(), and Mark().

◆ m_traceRequeue

TracedCallback<Ptr<const QueueDiscItem> > ns3::QueueDisc::m_traceRequeue

private

Traced callback: fired when a packet is requeued.

Definition at line 716 of file queue-disc.h.

Referenced by GetTypeId(), and Requeue().

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

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

Classes

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ ChildQueueDiscDropFunctor

◆ ChildQueueDiscMarkFunctor

◆ InternalQueue

◆ InternalQueueDropFunctor

◆ SendCallback

Member Enumeration Documentation

◆ WakeMode

Constructor & Destructor Documentation

◆ QueueDisc() [1/3]

◆ QueueDisc() [2/3]

◆ ~QueueDisc()

◆ QueueDisc() [3/3]

Member Function Documentation

◆ AddInternalQueue()

◆ AddPacketFilter()

◆ AddQueueDiscClass()

◆ CheckConfig()

◆ Classify()

◆ Dequeue()

◆ DequeuePacket()

◆ DoDequeue()

◆ DoDispose()

◆ DoEnqueue()

◆ DoInitialize()

◆ DoPeek()

◆ DropAfterDequeue()

◆ DropBeforeEnqueue()

◆ Enqueue()

◆ GetCurrentSize()

◆ GetInternalQueue()

◆ GetMaxSize()

◆ GetNBytes()

◆ GetNetDeviceQueueInterface()

◆ GetNInternalQueues()

◆ GetNPacketFilters()

◆ GetNPackets()

◆ GetNQueueDiscClasses()

◆ GetPacketFilter()

◆ GetQueueDiscClass()

◆ GetQuota()

◆ GetSendCallback()

◆ GetStats()

◆ GetTypeId()

◆ GetWakeMode()

◆ InitializeParams()

◆ Mark()

◆ operator=()

◆ PacketDequeued()

◆ PacketEnqueued()

◆ Peek()

◆ Requeue()

◆ Restart()

◆ Run()

◆ RunBegin()

◆ RunEnd()

◆ SetMaxSize()

◆ SetNetDeviceQueueInterface()

◆ SetQuota()

◆ SetSendCallback()

◆ Transmit()

Member Data Documentation

◆ CHILD_QUEUE_DISC_DROP

◆ CHILD_QUEUE_DISC_MARK

◆ DEFAULT_QUOTA

◆ INTERNAL_QUEUE_DROP

◆ m_childQueueDiscDadFunctor

◆ m_childQueueDiscDbeFunctor