Network device transmission queue. More...

#include "net-device-queue-interface.h"

Inheritance diagram for ns3::NetDeviceQueue:

Collaboration diagram for ns3::NetDeviceQueue:

Public Types
typedef Callback< void >	WakeCallback
	Callback invoked by netdevices to wake upper layers. More...

Public Member Functions
	NetDeviceQueue ()

virtual	~NetDeviceQueue ()

template<typename QueueType >
void	ConnectQueueTraces (Ptr< QueueType > queue)
	Connect the traced callbacks of a queue to the methods providing support for flow control and dynamic queue limits. More...

Ptr< QueueLimits >	GetQueueLimits ()
	Get queue limits to this queue. More...

bool	IsStopped (void) const
	Get the status of the device transmission queue. More...

void	NotifyAggregatedObject (Ptr< NetDeviceQueueInterface > ndqi)
	Notify this NetDeviceQueue that the NetDeviceQueueInterface was aggregated to an object. More...

void	NotifyQueuedBytes (uint32_t bytes)
	Called by the netdevice to report the number of bytes queued to the device queue. More...

void	NotifyTransmittedBytes (uint32_t bytes)
	Called by the netdevice to report the number of bytes it is going to transmit. More...

template<typename QueueType >
void	PacketDequeued (QueueType *queue, Ptr< const typename QueueType::ItemType > item)
	Perform the actions required by flow control and dynamic queue limits when a packet is dequeued (or dropped after dequeue) from the queue of a netdevice. More...

template<typename QueueType >
void	PacketDiscarded (QueueType *queue, Ptr< const typename QueueType::ItemType > item)
	Perform the actions required by flow control and dynamic queue limits when a packet is dropped before being enqueued in the queue of a netdevice (which likely indicates that the queue is full) More...

template<typename QueueType >
void	PacketEnqueued (QueueType *queue, Ptr< const typename QueueType::ItemType > item)
	Perform the actions required by flow control and dynamic queue limits when a packet is enqueued in the queue of a netdevice. More...

void	ResetQueueLimits ()
	Reset queue limits state. More...

void	SetQueueLimits (Ptr< QueueLimits > ql)
	Set queue limits to this queue. More...

virtual void	SetWakeCallback (WakeCallback cb)
	Set the wake callback. More...

virtual void	Start (void)
	Called by the device to start this device transmission queue. More...

virtual void	Stop (void)
	Called by the device to stop this device transmission queue. More...

virtual void	Wake (void)
	Called by the device to wake the queue disc associated with this device transmission queue. More...

Public Member Functions inherited from ns3::SimpleRefCount< NetDeviceQueue >
	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...

Private Attributes
Ptr< NetDevice >	m_device
	the netdevice aggregated to the NetDeviceQueueInterface More...

Ptr< QueueLimits >	m_queueLimits
	Queue limits object. More...

bool	m_stoppedByDevice
	True if the queue has been stopped by the device. More...

bool	m_stoppedByQueueLimits
	True if the queue has been stopped by a queue limits object. More...

WakeCallback	m_wakeCallback
	Wake callback. More...

	NS_LOG_TEMPLATE_DECLARE
	redefinition of the log component More...

Detailed Description

Network device transmission queue.

This class stores information about a single transmission queue of a network device that is exposed to queue discs. Such information includes the state of the transmission queue (whether it has been stopped or not) and data used by techniques such as Byte Queue Limits.

This class roughly models the struct netdev_queue of Linux.

Definition at line 55 of file net-device-queue-interface.h.

Member Typedef Documentation

◆ WakeCallback

typedef Callback< void > ns3::NetDeviceQueue::WakeCallback

Callback invoked by netdevices to wake upper layers.

Definition at line 101 of file net-device-queue-interface.h.

Constructor & Destructor Documentation

◆ NetDeviceQueue()

ns3::NetDeviceQueue::NetDeviceQueue ( )

Definition at line 32 of file net-device-queue-interface.cc.

References NS_LOG_FUNCTION.

◆ ~NetDeviceQueue()

ns3::NetDeviceQueue::~NetDeviceQueue ( )

virtual

Definition at line 40 of file net-device-queue-interface.cc.

References m_device, m_queueLimits, m_wakeCallback, NS_LOG_FUNCTION, and ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::Nullify().

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Member Function Documentation

◆ ConnectQueueTraces()

template<typename QueueType >

void ns3::NetDeviceQueue::ConnectQueueTraces ( Ptr< QueueType > queue )

Connect the traced callbacks of a queue to the methods providing support for flow control and dynamic queue limits.

Implementation of the templates declared above.

A queue can be any object providing:

"Enqueue", "Dequeue", "DropBeforeEnqueue" traces
an ItemType typedef for the type of stored items
GetCurrentSize and GetMaxSize methods
Parameters

queue the queue

Definition at line 307 of file net-device-queue-interface.h.

References ns3::MakeCallback(), NS_ASSERT, and ns3::PeekPointer().

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◆ GetQueueLimits()

Ptr< QueueLimits > ns3::NetDeviceQueue::GetQueueLimits ( )

Get queue limits to this queue.

Returns: the queue limits associated to this queue

Definition at line 157 of file net-device-queue-interface.cc.

References m_queueLimits, and NS_LOG_FUNCTION.

◆ IsStopped()

bool ns3::NetDeviceQueue::IsStopped ( void ) const

Get the status of the device transmission queue.

Returns: true if the device transmission queue is stopped.

Called by queue discs to enquire about the status of a given transmission queue. This is the analogous to the netif_xmit_stopped function of the Linux kernel.

Definition at line 50 of file net-device-queue-interface.cc.

References m_stoppedByDevice, m_stoppedByQueueLimits, and NS_LOG_FUNCTION.

◆ NotifyAggregatedObject()

void ns3::NetDeviceQueue::NotifyAggregatedObject ( Ptr< NetDeviceQueueInterface > ndqi )

Notify this NetDeviceQueue that the NetDeviceQueueInterface was aggregated to an object.

Parameters

ndqi	the NetDeviceQueueInterface.

This NetDeviceQueue stores a pointer to the NetDevice the NetDeviceQueueInterface was aggregated to.

Definition at line 86 of file net-device-queue-interface.cc.

References m_device, NS_ABORT_MSG_IF, and NS_LOG_FUNCTION.

◆ NotifyQueuedBytes()

void ns3::NetDeviceQueue::NotifyQueuedBytes ( uint32_t bytes )

Called by the netdevice to report the number of bytes queued to the device queue.

Parameters

bytes number of bytes queued to the device queue

Definition at line 101 of file net-device-queue-interface.cc.

References m_queueLimits, m_stoppedByQueueLimits, and NS_LOG_FUNCTION.

Referenced by PacketEnqueued().

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◆ NotifyTransmittedBytes()

void ns3::NetDeviceQueue::NotifyTransmittedBytes ( uint32_t bytes )

Called by the netdevice to report the number of bytes it is going to transmit.

Parameters

bytes number of bytes the device is going to transmit

Definition at line 117 of file net-device-queue-interface.cc.

References ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_queueLimits, m_stoppedByQueueLimits, m_wakeCallback, NS_LOG_FUNCTION, and ns3::Simulator::ScheduleNow().

Referenced by PacketDequeued().

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◆ PacketDequeued()

template<typename QueueType >

void ns3::NetDeviceQueue::PacketDequeued	(	QueueType *	queue,
		Ptr< const typename QueueType::ItemType >	item
	)

Perform the actions required by flow control and dynamic queue limits when a packet is dequeued (or dropped after dequeue) from the queue of a netdevice.

Parameters

queue	the device queue
item	the dequeued packet

This method must be connected to the "Dequeue" traced callback of a Queue object (through a bound callback) in order for a netdevice to support flow control and dynamic queue limits.

Definition at line 347 of file net-device-queue-interface.h.

References m_device, NotifyTransmittedBytes(), NS_ASSERT_MSG(), NS_LOG_FUNCTION, and Wake().

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◆ PacketDiscarded()

template<typename QueueType >

void ns3::NetDeviceQueue::PacketDiscarded	(	QueueType *	queue,
		Ptr< const typename QueueType::ItemType >	item
	)

Perform the actions required by flow control and dynamic queue limits when a packet is dropped before being enqueued in the queue of a netdevice (which likely indicates that the queue is full)

Parameters

queue	the device queue
item	the dropped packet

This method must be connected to the "DropBeforeEnqueue" traced callback of a Queue object (through a bound callback) in order for a netdevice to support flow control and dynamic queue limits.

Definition at line 369 of file net-device-queue-interface.h.

References NS_LOG_ERROR, NS_LOG_FUNCTION, and Stop().

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◆ PacketEnqueued()

template<typename QueueType >

void ns3::NetDeviceQueue::PacketEnqueued	(	QueueType *	queue,
		Ptr< const typename QueueType::ItemType >	item
	)

Perform the actions required by flow control and dynamic queue limits when a packet is enqueued in the queue of a netdevice.

Parameters

queue	the device queue
item	the enqueued packet

This method must be connected to the "Enqueue" traced callback of a Queue object (through a bound callback) in order for a netdevice to support flow control and dynamic queue limits.

Definition at line 324 of file net-device-queue-interface.h.

References m_device, NotifyQueuedBytes(), NS_ASSERT_MSG(), NS_LOG_DEBUG, NS_LOG_FUNCTION, and Stop().

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◆ ResetQueueLimits()

void ns3::NetDeviceQueue::ResetQueueLimits ( )

Reset queue limits state.

Definition at line 139 of file net-device-queue-interface.cc.

References m_queueLimits, and NS_LOG_FUNCTION.

◆ SetQueueLimits()

void ns3::NetDeviceQueue::SetQueueLimits ( Ptr< QueueLimits > ql )

Set queue limits to this queue.

Parameters

ql	the queue limits associated to this queue

Definition at line 150 of file net-device-queue-interface.cc.

References m_queueLimits, and NS_LOG_FUNCTION.

◆ SetWakeCallback()

void ns3::NetDeviceQueue::SetWakeCallback ( WakeCallback cb )

virtual

Set the wake callback.

Parameters

cb	the callback to set

Called by the traffic control layer to set the wake callback. The wake callback is invoked by the device whenever it is needed to "wake" the upper layers (i.e., solicitate the queue disc associated with this transmission queue (in case of multi-queue aware queue discs) or to the network device (otherwise) to send packets down to the device).

Definition at line 95 of file net-device-queue-interface.cc.

References m_wakeCallback.