Reno congestion control algorithm. More...
#include "tcp-linux-reno.h"
Public Member Functions | |
TcpLinuxReno () | |
TcpLinuxReno (const TcpLinuxReno &sock) | |
Copy constructor. | |
~TcpLinuxReno () override | |
Ptr< TcpCongestionOps > | Fork () override |
Copy the congestion control algorithm across sockets. | |
std::string | GetName () const override |
Get the name of the congestion control algorithm. | |
uint32_t | GetSsThresh (Ptr< const TcpSocketState > tcb, uint32_t bytesInFlight) override |
Get the slow start threshold after a loss event. | |
void | IncreaseWindow (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked) override |
Congestion avoidance algorithm implementation. | |
Public Member Functions inherited from ns3::TcpCongestionOps | |
TcpCongestionOps () | |
TcpCongestionOps (const TcpCongestionOps &other) | |
Copy constructor. | |
~TcpCongestionOps () override | |
virtual void | CongControl (Ptr< TcpSocketState > tcb, const TcpRateOps::TcpRateConnection &rc, const TcpRateOps::TcpRateSample &rs) |
Called when packets are delivered to update cwnd and pacing rate. | |
virtual void | CongestionStateSet (Ptr< TcpSocketState > tcb, const TcpSocketState::TcpCongState_t newState) |
Trigger events/calculations specific to a congestion state. | |
virtual void | CwndEvent (Ptr< TcpSocketState > tcb, const TcpSocketState::TcpCAEvent_t event) |
Trigger events/calculations on occurrence of congestion window event. | |
virtual bool | HasCongControl () const |
Returns true when Congestion Control Algorithm implements CongControl. | |
virtual void | Init (Ptr< TcpSocketState > tcb) |
Set configuration required by congestion control algorithm. | |
virtual void | PktsAcked (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked, const Time &rtt) |
Timing information on received ACK. | |
Public Member Functions inherited from ns3::Object | |
Object () | |
Constructor. | |
~Object () override | |
Destructor. | |
void | AggregateObject (Ptr< Object > other) |
Aggregate two Objects together. | |
void | Dispose () |
Dispose of this Object. | |
AggregateIterator | GetAggregateIterator () const |
Get an iterator to the Objects aggregated to this one. | |
TypeId | GetInstanceTypeId () const override |
Get the most derived TypeId for this Object. | |
template<typename T > | |
Ptr< T > | GetObject () const |
Get a pointer to the requested aggregated Object. | |
template<> | |
Ptr< Object > | GetObject () const |
Specialization of () for objects of type ns3::Object. | |
template<typename T > | |
Ptr< T > | GetObject (TypeId tid) const |
Get a pointer to the requested aggregated Object by TypeId. | |
template<> | |
Ptr< Object > | GetObject (TypeId tid) const |
Specialization of (TypeId tid) for objects of type ns3::Object. | |
void | Initialize () |
Invoke DoInitialize on all Objects aggregated to this one. | |
bool | IsInitialized () const |
Check if the object has been initialized. | |
void | UnidirectionalAggregateObject (Ptr< Object > other) |
Aggregate an Object to another Object. | |
Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter > | |
SimpleRefCount () | |
Default constructor. | |
SimpleRefCount (const SimpleRefCount &o) | |
Copy constructor. | |
uint32_t | GetReferenceCount () const |
Get the reference count of the object. | |
SimpleRefCount & | operator= (const SimpleRefCount &o) |
Assignment operator. | |
void | Ref () const |
Increment the reference count. | |
void | Unref () const |
Decrement the reference count. | |
Public Member Functions inherited from ns3::ObjectBase | |
virtual | ~ObjectBase () |
Virtual destructor. | |
void | GetAttribute (std::string name, AttributeValue &value, bool permissive=false) const |
Get the value of an attribute, raising fatal errors if unsuccessful. | |
bool | GetAttributeFailSafe (std::string name, AttributeValue &value) const |
Get the value of an attribute without raising errors. | |
void | SetAttribute (std::string name, const AttributeValue &value) |
Set a single attribute, raising fatal errors if unsuccessful. | |
bool | SetAttributeFailSafe (std::string name, const AttributeValue &value) |
Set a single attribute without raising errors. | |
bool | TraceConnect (std::string name, std::string context, const CallbackBase &cb) |
Connect a TraceSource to a Callback with a context. | |
bool | TraceConnectWithoutContext (std::string name, const CallbackBase &cb) |
Connect a TraceSource to a Callback without a context. | |
bool | TraceDisconnect (std::string name, std::string context, const CallbackBase &cb) |
Disconnect from a TraceSource a Callback previously connected with a context. | |
bool | TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb) |
Disconnect from a TraceSource a Callback previously connected without a context. | |
Static Public Member Functions | |
static TypeId | GetTypeId () |
Get the type ID. | |
Static Public Member Functions inherited from ns3::TcpCongestionOps | |
static TypeId | GetTypeId () |
Get the type ID. | |
Static Public Member Functions inherited from ns3::Object | |
static TypeId | GetTypeId () |
Register this type. | |
Static Public Member Functions inherited from ns3::ObjectBase | |
static TypeId | GetTypeId () |
Get the type ID. | |
Protected Member Functions | |
virtual void | CongestionAvoidance (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked) |
Congestion avoidance phase handler. | |
void | SetSuppressIncreaseIfCwndLimited (bool value) |
TcpSocketBase follows the Linux way of setting a flag 'isCwndLimited' when BytesInFlight() >= cwnd. | |
virtual uint32_t | SlowStart (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked) |
Slow start phase handler. | |
Protected Member Functions inherited from ns3::Object | |
Object (const Object &o) | |
Copy an Object. | |
virtual void | DoDispose () |
Destructor implementation. | |
virtual void | DoInitialize () |
Initialize() implementation. | |
virtual void | NotifyNewAggregate () |
Notify all Objects aggregated to this one of a new Object being aggregated. | |
Protected Member Functions inherited from ns3::ObjectBase | |
void | ConstructSelf (const AttributeConstructionList &attributes) |
Complete construction of ObjectBase; invoked by derived classes. | |
virtual void | NotifyConstructionCompleted () |
Notifier called once the ObjectBase is fully constructed. | |
Private Attributes | |
uint32_t | m_cWndCnt {0} |
Linear increase counter. | |
bool | m_suppressIncreaseIfCwndLimited |
Suppress window increase if TCP is not cwnd limited. | |
Additional Inherited Members | |
Related Symbols inherited from ns3::ObjectBase | |
static TypeId | GetObjectIid () |
Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. | |
Reno congestion control algorithm.
This class implement the Reno congestion control type and it mimics the one implemented in the Linux kernel.
Definition at line 28 of file tcp-linux-reno.h.
ns3::TcpLinuxReno::TcpLinuxReno | ( | ) |
Definition at line 32 of file tcp-linux-reno.cc.
References NS_LOG_FUNCTION.
ns3::TcpLinuxReno::TcpLinuxReno | ( | const TcpLinuxReno & | sock | ) |
Copy constructor.
sock | object to copy. |
Definition at line 38 of file tcp-linux-reno.cc.
References NS_LOG_FUNCTION.
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override |
Definition at line 44 of file tcp-linux-reno.cc.
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protectedvirtual |
Congestion avoidance phase handler.
tcb | Transmission Control Block of the connection |
segmentsAcked | count of segments acked |
Definition at line 67 of file tcp-linux-reno.cc.
References m_cWndCnt, m_suppressIncreaseIfCwndLimited, NS_LOG_DEBUG, and NS_LOG_FUNCTION.
Referenced by IncreaseWindow().
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overridevirtual |
Copy the congestion control algorithm across sockets.
Implements ns3::TcpCongestionOps.
Definition at line 144 of file tcp-linux-reno.cc.
References ns3::Object::CopyObject.
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overridevirtual |
Get the name of the congestion control algorithm.
Implements ns3::TcpCongestionOps.
Definition at line 129 of file tcp-linux-reno.cc.
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overridevirtual |
Get the slow start threshold after a loss event.
Is guaranteed that the congestion control state (TcpAckState_t
) is changed BEFORE the invocation of this method. The implementer should return the slow start threshold (and not change it directly) because, in the future, the TCP implementation may require to instantly recover from a loss event (e.g. when there is a network with an high reordering factor).
tcb | internal congestion state |
bytesInFlight | total bytes in flight |
Implements ns3::TcpCongestionOps.
Definition at line 135 of file tcp-linux-reno.cc.
References NS_LOG_FUNCTION.
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static |
Get the type ID.
Definition at line 23 of file tcp-linux-reno.cc.
References ns3::TypeId::SetParent().
Referenced by TcpLinuxRenoTestSuite::TcpLinuxRenoTestSuite().
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overridevirtual |
Congestion avoidance algorithm implementation.
Mimic the function cong_avoid in Linux. New segments have been ACKed, and the congestion control duty is to update the window.
The function is allowed to change directly cWnd and/or ssThresh.
tcb | internal congestion state |
segmentsAcked | count of segments acked |
Reimplemented from ns3::TcpCongestionOps.
Definition at line 110 of file tcp-linux-reno.cc.
References CongestionAvoidance(), NS_LOG_DEBUG, NS_LOG_FUNCTION, and SlowStart().
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protected |
TcpSocketBase follows the Linux way of setting a flag 'isCwndLimited' when BytesInFlight() >= cwnd.
This flag, if true, will suppress additive increase window updates for this class. However, some derived classes using the IncreaseWindow() method may not want this behavior, so this method exists to allow subclasses to set it to false.
value | Value to set whether the isCwndLimited condition suppresses window updates |
Definition at line 150 of file tcp-linux-reno.cc.
References m_suppressIncreaseIfCwndLimited, and NS_LOG_FUNCTION.
Referenced by ns3::TcpDctcp::Init().
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protectedvirtual |
Slow start phase handler.
tcb | Transmission Control Block of the connection |
segmentsAcked | count of segments acked |
Definition at line 49 of file tcp-linux-reno.cc.
References NS_LOG_FUNCTION, and NS_LOG_INFO.
Referenced by IncreaseWindow().
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private |
Linear increase counter.
Definition at line 81 of file tcp-linux-reno.h.
Referenced by CongestionAvoidance().
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private |
Suppress window increase if TCP is not cwnd limited.
Definition at line 85 of file tcp-linux-reno.h.
Referenced by CongestionAvoidance(), and SetSuppressIncreaseIfCwndLimited().