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/*
* Copyright (c) 2007, 2014 University of Washington
* 2015 Universita' degli Studi di Napoli Federico II
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef QUEUE_DISC_H
#define QUEUE_DISC_H
#include "ns3/object.h"
#include "ns3/traced-value.h"
#include "ns3/net-device.h"
#include "ns3/queue-item.h"
#include <vector>
#include <map>
#include <functional>
#include <string>
#include "packet-filter.h"
namespace ns3 {
class QueueDisc;
template <typename Item> class Queue;
class NetDeviceQueueInterface;
/**
* \ingroup traffic-control
*
* QueueDiscClass is the base class for classes that are included in a queue
* disc. It has a single attribute, QueueDisc, used to set the child queue disc
* attached to the class. Classful queue discs needing to set parameters for
* their classes can subclass QueueDiscClass and add the required parameters
* as attributes.
*/
class QueueDiscClass : public Object {
public:
/**
* \brief Get the type ID.
* \return the object TypeId
*/
static TypeId GetTypeId (void);
QueueDiscClass ();
virtual ~QueueDiscClass ();
/**
* \brief Get the queue disc attached to this class
* \return the queue disc attached to this class.
*/
Ptr<QueueDisc> GetQueueDisc (void) const;
/**
* \brief Set the queue disc attached to this class
* \param qd The queue disc to attach to this class
*/
void SetQueueDisc (Ptr<QueueDisc> qd);
protected:
/**
* \brief Dispose of the object
*/
virtual void DoDispose (void);
private:
Ptr<QueueDisc> m_queueDisc; //!< Queue disc attached to this class
};
/**
* \ingroup traffic-control
*
* 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.
*/
class QueueDisc : public Object {
public:
/// \brief Structure that keeps the queue disc statistics
struct Stats
{
/// Total received packets
uint32_t nTotalReceivedPackets;
/// Total received bytes
uint64_t nTotalReceivedBytes;
/// Total sent packets -- this value is not kept up to date, call GetStats first
uint32_t nTotalSentPackets;
/// Total sent bytes -- this value is not kept up to date, call GetStats first
uint64_t nTotalSentBytes;
/// Total enqueued packets
uint32_t nTotalEnqueuedPackets;
/// Total enqueued bytes
uint64_t nTotalEnqueuedBytes;
/// Total dequeued packets
uint32_t nTotalDequeuedPackets;
/// Total dequeued bytes
uint64_t nTotalDequeuedBytes;
/// Total dropped packets
uint32_t nTotalDroppedPackets;
/// Total packets dropped before enqueue
uint32_t nTotalDroppedPacketsBeforeEnqueue;
/// Packets dropped before enqueue, for each reason
std::map<std::string, uint32_t> nDroppedPacketsBeforeEnqueue;
/// Total packets dropped after dequeue
uint32_t nTotalDroppedPacketsAfterDequeue;
/// Packets dropped after dequeue, for each reason
std::map<std::string, uint32_t> nDroppedPacketsAfterDequeue;
/// Total dropped bytes
uint64_t nTotalDroppedBytes;
/// Total bytes dropped before enqueue
uint64_t nTotalDroppedBytesBeforeEnqueue;
/// Bytes dropped before enqueue, for each reason
std::map<std::string, uint64_t> nDroppedBytesBeforeEnqueue;
/// Total bytes dropped after dequeue
uint64_t nTotalDroppedBytesAfterDequeue;
/// Bytes dropped after dequeue, for each reason
std::map<std::string, uint64_t> nDroppedBytesAfterDequeue;
/// Total requeued packets
uint32_t nTotalRequeuedPackets;
/// Total requeued bytes
uint64_t nTotalRequeuedBytes;
/// Total marked packets
uint32_t nTotalMarkedPackets;
/// Marked packets, for each reason
std::map<std::string, uint32_t> nMarkedPackets;
/// Total marked bytes
uint32_t nTotalMarkedBytes;
/// Marked bytes, for each reason
std::map<std::string, uint64_t> nMarkedBytes;
/// constructor
Stats ();
/**
* \brief Get the number of packets dropped for the given reason
* \param reason the reason why packets were dropped
* \return the number of packets dropped for the given reason
*/
uint32_t GetNDroppedPackets (std::string reason) const;
/**
* \brief Get the amount of bytes dropped for the given reason
* \param reason the reason why packets were dropped
* \return the amount of bytes dropped for the given reason
*/
uint64_t GetNDroppedBytes (std::string reason) const;
/**
* \brief Get the number of packets marked for the given reason
* \param reason the reason why packets were marked
* \return the number of packets marked for the given reason
*/
uint32_t GetNMarkedPackets (std::string reason) const;
/**
* \brief Get the amount of bytes marked for the given reason
* \param reason the reason why packets were marked
* \return the amount of bytes marked for the given reason
*/
uint64_t GetNMarkedBytes (std::string reason) const;
/**
* \brief Print the statistics.
* \param os output stream in which the data should be printed.
*/
void Print (std::ostream &os) const;
};
/**
* \brief Get the type ID.
* \return the object TypeId
*/
static TypeId GetTypeId (void);
QueueDisc ();
virtual ~QueueDisc ();
/**
* \brief Get the number of packets stored by the queue disc
* \return the number of packets stored by the queue disc.
*
* The requeued packet, if any, is counted.
*/
uint32_t GetNPackets (void) const;
/**
* \brief Get the amount of bytes stored by the queue disc
* \return the amount of bytes stored by the queue disc.
*
* The requeued packet, if any, is counted.
*/
uint32_t GetNBytes (void) const;
/**
* \brief Retrieve all the collected statistics.
* \return the collected statistics.
*/
const Stats& GetStats (void);
/**
* \brief Set the NetDevice on which this queue discipline is installed.
* \param device the NetDevice on which this queue discipline is installed.
*/
void SetNetDevice (Ptr<NetDevice> device);
/**
* \brief Get the NetDevice on which this queue discipline is installed
* \return the NetDevice on which this queue discipline is installed.
*/
Ptr<NetDevice> GetNetDevice (void) const;
/**
* \brief Set the maximum number of dequeue operations following a packet enqueue
* \param quota the maximum number of dequeue operations following a packet enqueue.
*/
virtual void SetQuota (const uint32_t quota);
/**
* \brief Get the maximum number of dequeue operations following a packet enqueue
* \return the maximum number of dequeue operations following a packet enqueue.
*/
virtual uint32_t GetQuota (void) const;
/**
* 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.
* \param item item to enqueue
* \return True if the operation was successful; false otherwise
*/
bool Enqueue (Ptr<QueueDiscItem> item);
/**
* Request the queue discipline to extract a packet. This function only updates
* the statistics and calls the (private) DoDequeue function, which must be
* implemented by derived classes.
* \return 0 if the operation was not successful; the item otherwise.
*/
Ptr<QueueDiscItem> Dequeue (void);
/**
* Get a copy of the next packet the queue discipline will extract, without
* actually extracting the packet. This function only calls the (private)
* DoPeek function, which must be implemented by derived classes.
* \return 0 if the operation was not successful; the item otherwise.
*/
Ptr<const QueueDiscItem> Peek (void) const;
/**
* 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.
*/
void Run (void);
/// Internal queues store QueueDiscItem objects
typedef Queue<QueueDiscItem> InternalQueue;
/**
* \brief Add an internal queue to the tail of the list of queues.
* \param queue the queue to be added
*/
void AddInternalQueue (Ptr<InternalQueue> queue);
/**
* \brief Get the i-th internal queue
* \param i the index of the queue
* \return the i-th internal queue.
*/
Ptr<InternalQueue> GetInternalQueue (uint32_t i) const;
/**
* \brief Get the number of internal queues
* \return the number of internal queues.
*/
uint32_t GetNInternalQueues (void) const;
/**
* \brief Add a packet filter to the tail of the list of filters used to classify packets.
* \param filter the packet filter to be added
*/
void AddPacketFilter (Ptr<PacketFilter> filter);
/**
* \brief Get the i-th packet filter
* \param i the index of the packet filter
* \return the i-th packet filter.
*/
Ptr<PacketFilter> GetPacketFilter (uint32_t i) const;
/**
* \brief Get the number of packet filters
* \return the number of packet filters.
*/
uint32_t GetNPacketFilters (void) const;
/**
* \brief Add a queue disc class to the tail of the list of classes.
* \param qdClass the queue disc class to be added
*/
void AddQueueDiscClass (Ptr<QueueDiscClass> qdClass);
/**
* \brief Get the i-th queue disc class
* \param i the index of the queue disc class
* \return the i-th queue disc class.
*/
Ptr<QueueDiscClass> GetQueueDiscClass (uint32_t i) const;
/**
* \brief Get the number of queue disc classes
* \return the number of queue disc classes.
*/
uint32_t GetNQueueDiscClasses (void) const;
/**
* 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.
* \param item item to classify
* \return -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.
*/
int32_t Classify (Ptr<QueueDiscItem> item);
/**
* \enum WakeMode
* \brief Used to determine whether the queue disc itself or its children must
* be activated when a netdevice wakes a transmission queue
*/
enum WakeMode
{
WAKE_ROOT = 0x00,
WAKE_CHILD = 0x01
};
/**
* 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.
*
* \return the wake mode adopted by this queue disc.
*/
virtual WakeMode GetWakeMode (void) const;
// Reasons for dropping packets
static constexpr const char* INTERNAL_QUEUE_DROP = "Dropped by internal queue"; //!< Packet dropped by an internal queue
static constexpr const char* CHILD_QUEUE_DISC_DROP = "(Dropped by child queue disc) "; //!< Packet dropped by a child queue disc
protected:
/**
* \brief Dispose of the object
*/
virtual void DoDispose (void);
/**
* \brief 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).
*/
void DoInitialize (void);
/**
* \brief Perform the actions required when the queue disc is notified of
* a packet dropped before enqueue
* \param item item that was dropped
* \param 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
*/
void DropBeforeEnqueue (Ptr<const QueueDiscItem> item, const char* reason);
/**
* \brief Perform the actions required when the queue disc is notified of
* a packet dropped after dequeue
* \param item item that was dropped
* \param 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
*/
void DropAfterDequeue (Ptr<const QueueDiscItem> item, const char* reason);
/**
* \brief Marks the given packet and, if successful, updates the counters
* associated with the given reason
* \param item item that has to be marked
* \param reason the reason why the item has to be marked
* \return true if the item was successfully marked, false otherwise
*/
bool Mark (Ptr<QueueDiscItem> item, const char* reason);
private:
/**
* \brief Copy constructor
* \param o object to copy
*
* Defined and unimplemented to avoid misuse
*/
QueueDisc (const QueueDisc &o);
/**
* \brief Assignment operator
* \param o object to copy
* \returns the copied object
*
* Defined and unimplemented to avoid misuse
*/
QueueDisc &operator = (const QueueDisc &o);
/**
* This function actually enqueues a packet into the queue disc.
* \param item item to enqueue
* \return True if the operation was successful; false otherwise
*/
virtual bool DoEnqueue (Ptr<QueueDiscItem> item) = 0;
/**
* This function actually extracts a packet from the queue disc.
* \return 0 if the operation was not successful; the item otherwise.
*/
virtual Ptr<QueueDiscItem> DoDequeue (void) = 0;
/**
* This function returns a copy of the next packet the queue disc will extract.
* \return 0 if the operation was not successful; the packet otherwise.
*/
virtual Ptr<const QueueDiscItem> DoPeek (void) const = 0;
/**
* 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.
* \return true if the configuration is correct, false otherwise
*/
virtual bool CheckConfig (void) = 0;
/**
* Initialize parameters (if any) before the first packet is enqueued.
*/
virtual void InitializeParams (void) = 0;
/**
* Modelled after the Linux function qdisc_run_begin (include/net/sch_generic.h).
* \return false if the qdisc is already running; otherwise, set the qdisc as running and return true.
*/
bool RunBegin (void);
/**
* Modelled after the Linux function qdisc_run_end (include/net/sch_generic.h).
* Set the qdisc as not running.
*/
void RunEnd (void);
/**
* 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).
* \return true if a packet is successfully sent to the device.
*/
bool Restart (void);
/**
* Modelled after the Linux function dequeue_skb (net/sched/sch_generic.c)
* \return the requeued packet, if any, or the packet dequeued by the queue disc, otherwise.
*/
Ptr<QueueDiscItem> DequeuePacket (void);
/**
* Modelled after the Linux function dev_requeue_skb (net/sched/sch_generic.c)
* Requeues a packet whose transmission failed.
* \param item the packet to requeue
*/
void Requeue (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.
* \param item the packet to transmit
* \return true if the device queue is not stopped and the queue disc is not empty
*/
bool Transmit (Ptr<QueueDiscItem> item);
/**
* \brief Perform the actions required when the queue disc is notified of
* a packet enqueue
* \param item item that was enqueued
*/
void PacketEnqueued (Ptr<const QueueDiscItem> item);
/**
* \brief Perform the actions required when the queue disc is notified of
* a packet dequeue
* \param item item that was dequeued
*/
void PacketDequeued (Ptr<const QueueDiscItem> item);
static const uint32_t DEFAULT_QUOTA = 64; //!< Default quota (as in /proc/sys/net/core/dev_weight)
std::vector<Ptr<InternalQueue> > m_queues; //!< Internal queues
std::vector<Ptr<PacketFilter> > m_filters; //!< Packet filters
std::vector<Ptr<QueueDiscClass> > m_classes; //!< Classes
TracedValue<uint32_t> m_nPackets; //!< Number of packets in the queue
TracedValue<uint32_t> m_nBytes; //!< Number of bytes in the queue
TracedValue<Time> m_sojourn; //!< Sojourn time of the latest dequeued packet
Stats m_stats; //!< The collected statistics
uint32_t m_quota; //!< Maximum number of packets dequeued in a qdisc run
Ptr<NetDevice> m_device; //!< The NetDevice on which this queue discipline is installed
Ptr<NetDeviceQueueInterface> m_devQueueIface; //!< NetDevice queue interface
bool m_running; //!< The queue disc is performing multiple dequeue operations
Ptr<QueueDiscItem> m_requeued; //!< The last packet that failed to be transmitted
std::string m_childQueueDiscDropMsg; //!< Reason why a packet was dropped by a child queue disc
/// Traced callback: fired when a packet is enqueued
TracedCallback<Ptr<const QueueDiscItem> > m_traceEnqueue;
/// Traced callback: fired when a packet is dequeued
TracedCallback<Ptr<const QueueDiscItem> > m_traceDequeue;
/// Traced callback: fired when a packet is requeued
TracedCallback<Ptr<const QueueDiscItem> > m_traceRequeue;
/// Traced callback: fired when a packet is dropped
TracedCallback<Ptr<const QueueDiscItem> > m_traceDrop;
/// Traced callback: fired when a packet is dropped before enqueue
TracedCallback<Ptr<const QueueDiscItem>, const char* > m_traceDropBeforeEnqueue;
/// Traced callback: fired when a packet is dropped after dequeue
TracedCallback<Ptr<const QueueDiscItem>, const char* > m_traceDropAfterDequeue;
/// Traced callback: fired when a packet is marked
TracedCallback<Ptr<const QueueDiscItem>, const char* > m_traceMark;
/// Type for the function objects notifying that a packet has been dropped by an internal queue
typedef std::function<void (Ptr<const QueueDiscItem>)> InternalQueueDropFunctor;
/// Type for the function objects notifying that a packet has been dropped by a child queue disc
typedef std::function<void (Ptr<const QueueDiscItem>, const char*)> ChildQueueDiscDropFunctor;
/// Function object called when an internal queue dropped a packet before enqueue
InternalQueueDropFunctor m_internalQueueDbeFunctor;
/// Function object called when an internal queue dropped a packet after dequeue
InternalQueueDropFunctor m_internalQueueDadFunctor;
/// Function object called when a child queue disc dropped a packet before enqueue
ChildQueueDiscDropFunctor m_childQueueDiscDbeFunctor;
/// Function object called when a child queue disc dropped a packet after dequeue
ChildQueueDiscDropFunctor m_childQueueDiscDadFunctor;
};
/**
* \brief Stream insertion operator.
*
* \param os the stream
* \param stats the queue disc statistics
* \returns a reference to the stream
*/
std::ostream& operator<< (std::ostream& os, const QueueDisc::Stats &stats);
} // namespace ns3
#endif /* QueueDisc */
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