Interface for all operations that involve a Rate monitoring for TCP. More...
#include "tcp-rate-ops.h"
Classes | |
struct | TcpRateConnection |
Information about the connection rate. More... | |
struct | TcpRateSample |
Rate Sample structure. More... | |
Public Member Functions | |
virtual void | CalculateAppLimited (uint32_t cWnd, uint32_t in_flight, uint32_t segmentSize, const SequenceNumber32 &tailSeq, const SequenceNumber32 &nextTx, const uint32_t lostOut, const uint32_t retransOut)=0 |
If a gap is detected between sends, it means we are app-limited. | |
virtual const TcpRateSample & | GenerateSample (uint32_t delivered, uint32_t lost, bool is_sack_reneg, uint32_t priorInFlight, const Time &minRtt)=0 |
Generate a TcpRateSample to feed a congestion avoidance algorithm. | |
virtual const TcpRateConnection & | GetConnectionRate ()=0 |
virtual void | SkbDelivered (TcpTxItem *skb)=0 |
Update the Rate information after an item is received. | |
virtual void | SkbSent (TcpTxItem *skb, bool isStartOfTransmission)=0 |
Put the rate information inside the sent skb. | |
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::Object | |
static TypeId | GetTypeId () |
Register this type. | |
Static Public Member Functions inherited from ns3::ObjectBase | |
static TypeId | GetTypeId () |
Get the type ID. | |
Additional Inherited Members | |
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. | |
Related Symbols inherited from ns3::ObjectBase | |
static TypeId | GetObjectIid () |
Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. | |
Interface for all operations that involve a Rate monitoring for TCP.
The interface is meant to take information to generate rate information valid for congestion avoidance algorithm such as BBR.
Please take a look to the TcpRateLinux class for an example.
Definition at line 28 of file tcp-rate-ops.h.
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pure virtual |
If a gap is detected between sends, it means we are app-limited.
TODO What the Linux kernel is setting in tp->app_limited? https://elixir.bootlin.com/linux/latest/source/net/ipv4/tcp_rate.c#L177
cWnd | Congestion Window |
in_flight | In Flight size (in bytes) |
segmentSize | Segment size |
tailSeq | Tail Sequence |
nextTx | NextTx |
lostOut | Number of lost bytes |
retransOut | Number of retransmitted bytes |
Implemented in ns3::TcpRateLinux.
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pure virtual |
Generate a TcpRateSample to feed a congestion avoidance algorithm.
This function will be called after an ACK (or a SACK) is received. The (S)ACK carries some implicit information, such as how many segments have been lost or delivered. These values will be this function input.
delivered | number of delivered segments (e.g., receiving a cumulative ACK means having more than 1 segment delivered) relative to the most recent (S)ACK received |
lost | number of segments that we detected as lost after the reception of the most recent (S)ACK |
priorInFlight | number of segments previously considered in flight |
is_sack_reneg | Is SACK reneged? |
minRtt | Minimum RTT so far |
Implemented in ns3::TcpRateLinux.
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pure virtual |
Implemented in ns3::TcpRateLinux.
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static |
Get the type ID.
Get the type ID.
Definition at line 19 of file tcp-rate-ops.cc.
References ns3::TypeId::SetParent().
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pure virtual |
Update the Rate information after an item is received.
When an skb is sacked or acked, we fill in the rate sample with the (prior) delivery information when the skb was last transmitted.
If an ACK (s)acks multiple skbs (e.g., stretched-acks), this function is called multiple times. We favor the information from the most recently sent skb, i.e., the skb with the highest prior_delivered count.
skb | The SKB delivered ((s)ACKed) |
Implemented in ns3::TcpRateLinux.
Referenced by ns3::TcpSocketBase::ProcessOptionSack(), ns3::TcpSocketBase::ReceivedAck(), and TcpRateLinuxWithBufferTest::TestWithSackBlocks().
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pure virtual |
Put the rate information inside the sent skb.
Snapshot the current delivery information in the skb, to generate a rate sample later when the skb is (s)acked in SkbDelivered ().
skb | The SKB sent |
isStartOfTransmission | true if this is a start of transmission (i.e., in_flight == 0) |
Implemented in ns3::TcpRateLinux.