Neighbor-index data structure for nix-vector routing. More...

#include "nix-vector.h"

Inheritance diagram for ns3::NixVector:

Collaboration diagram for ns3::NixVector:

Public Member Functions
	NixVector ()

	NixVector (const NixVector &o)

	~NixVector ()

void	AddNeighborIndex (uint32_t newBits, uint32_t numberOfBits)

uint32_t	BitCount (uint32_t numberOfNeighbors) const

Ptr< NixVector >	Copy () const

uint32_t	Deserialize (const uint32_t *buffer, uint32_t size)

uint32_t	ExtractNeighborIndex (uint32_t numberOfBits)

uint32_t	GetEpoch () const
	Get the NixVector Epoch. More...

uint32_t	GetRemainingBits () const

uint32_t	GetSerializedSize () const

NixVector &	operator= (const NixVector &o)

uint32_t	Serialize (uint32_t *buffer, uint32_t maxSize) const

void	SetEpoch (uint32_t epoch)
	Set the NixVector Epoch. More...

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

Private Types
typedef std::vector< uint32_t >	NixBits_t
	Typedef: the NixVector bits storage. More...

Private Member Functions
void	DumpNixVector (std::ostream &os) const
	Print the NixVector. More...

void	PrintDec2BinNix (uint32_t decimalNum, uint32_t bitCount, std::ostream &os) const
	Internal for pretty printing of nix-vector (no fill) More...

Private Attributes
uint32_t	m_epoch
	Epoch of the Nix-vector creation. More...

NixBits_t	m_nixVector
	the actual nix-vector More...

uint32_t	m_totalBitSize
	A counter of how total bits are in the nix-vector. More...

uint32_t	m_used
	For tracking where we are in the nix-vector. More...

Friends
std::ostream &	operator<< (std::ostream &os, const NixVector &nix)
	Stream insertion operator. More...

Detailed Description

Neighbor-index data structure for nix-vector routing.

This data structure holds a vector of "neighbor-indexes" for a simulation specific routing protocol, nix-vector routing. These neighbor-indexes correspond to the net-device which a node should use to route a packet. A nix-vector is built (or fetched from a cache) on-demand. The nix-vector is transmitted with the packet, and along each hop of the route, the current node extracts the appropriate neighbor-index and routes the packet.

Internal:: The implementation of NixVector uses a vector to store the neighbor-indexes. Each entry in the vector is 32 bits long and can store multiple neighbor-indexes. A fair amount of bit manipulation is used to store these neighbor-indexes efficiently. A vector is used so that the nix-vector can grow arbitrarily if the topology and route requires a large number of neighbor-indexes.

As the nix-vector travels along the route, an internal private member variable keeps track of how many bits have been used. At a particular node, the nix-vector is used to return the next neighbor-index. This neighbor-index is used to determine which net-device to use. The number of bits used would then be incremented accordingly, and the packet would be routed.

Definition at line 64 of file nix-vector.h.

Member Typedef Documentation

◆ NixBits_t

typedef std::vector<uint32_t> ns3::NixVector::NixBits_t

private

Typedef: the NixVector bits storage.

Definition at line 168 of file nix-vector.h.

Constructor & Destructor Documentation

◆ NixVector() [1/2]

ns3::NixVector::NixVector ( )

Definition at line 32 of file nix-vector.cc.

References NS_LOG_FUNCTION.

Referenced by Copy().

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◆ ~NixVector()

ns3::NixVector::~NixVector ( )

Definition at line 41 of file nix-vector.cc.

References NS_LOG_FUNCTION.

◆ NixVector() [2/2]

ns3::NixVector::NixVector ( const NixVector & o )

Parameters

o	the NixVector to copy to a new NixVector using a constructor

Definition at line 46 of file nix-vector.cc.

Member Function Documentation

◆ AddNeighborIndex()

void ns3::NixVector::AddNeighborIndex	(	uint32_t	newBits,
		uint32_t	numberOfBits
	)

Parameters

newBits	the neighbor-index to be added to the vector
numberOfBits	the number of bits that newBits contains

Adds the neighbor index to the vector using a fair amount of bit manipulation to pack everything in efficiently.

Note: This function assumes that the number of bits to be added is always less than or equal to 32, ie., you can only span one entry of a nix-vector at a time. This is reasonable, since 32 bits gives you 2^32 possible neighbors.

Definition at line 88 of file nix-vector.cc.

References m_nixVector, m_totalBitSize, NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by ns3::NixVectorRouting< T >::BuildNixVector().

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◆ BitCount()

uint32_t ns3::NixVector::BitCount ( uint32_t numberOfNeighbors ) const

Returns: number of bits of numberOfNeighbors

Parameters

numberOfNeighbors the total number of neighbors

This function is used to determine the number of bits of numberOfNeighbors so that this value can be passed in to AddNeighborIndex or ExtractNeighborIndex.

Definition at line 331 of file nix-vector.cc.

References NS_LOG_FUNCTION.

Referenced by ns3::NixVectorRouting< T >::BuildNixVector(), ns3::NixVectorRouting< T >::PrintRoutingPath(), ns3::NixVectorRouting< T >::RouteInput(), and ns3::NixVectorRouting< T >::RouteOutput().

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◆ Copy()

Ptr< NixVector > ns3::NixVector::Copy ( ) const

Returns: a copy of this nix-vector

Definition at line 69 of file nix-vector.cc.

References NixVector(), and NS_LOG_FUNCTION.

Referenced by ns3::Packet::Packet(), ns3::Packet::operator=(), ns3::NixVectorRouting< T >::PrintRoutingPath(), and ns3::NixVectorRouting< T >::RouteOutput().

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◆ Deserialize()

uint32_t ns3::NixVector::Deserialize	(	const uint32_t *	buffer,
		uint32_t	size
	)

Returns: zero if a complete nix-vector is not deserialized

Parameters

buffer	points to buffer for deserialization
size	number of bytes to deserialize

The raw character buffer containing all the nix-vector information is deserialized into this nix-vector.

Definition at line 239 of file nix-vector.cc.

References GetSerializedSize(), m_epoch, m_nixVector, m_totalBitSize, m_used, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

Referenced by ns3::Packet::Deserialize().

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◆ DumpNixVector()

void ns3::NixVector::DumpNixVector ( std::ostream & os ) const

private

Print the NixVector.

Parameters

os	the output stream

Note: : this could be greatly simplified by using std::format (but it's C++20).

Definition at line 289 of file nix-vector.cc.

References m_nixVector, m_totalBitSize, NS_LOG_FUNCTION, and PrintDec2BinNix().

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◆ ExtractNeighborIndex()

uint32_t ns3::NixVector::ExtractNeighborIndex ( uint32_t numberOfBits )

Returns: the neighbor index

Parameters

numberOfBits the number of bits to extract from the vector

Extracts the number of bits specified from the vector and returns the value extracted

Note: This function assumes that the number of bits to be extracted is always less than or equal to 32, ie., you can only span one entry of a nix-vector at a time. This is reasonable, since 32 bits gives you 2^32 possible neighbors.

Definition at line 144 of file nix-vector.cc.

References GetRemainingBits(), m_nixVector, m_used, NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by ns3::NixVectorRouting< T >::PrintRoutingPath(), ns3::NixVectorRouting< T >::RouteInput(), and ns3::NixVectorRouting< T >::RouteOutput().

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