Simple Module MACRelayUnitNP

Package: inet.linklayer.etherswitch
File: src/linklayer/etherswitch/MACRelayUnitNP.ned

A MACRelayUnit implementation which models one or more CPUs with shared memory, working from a single shared queue.

It also models fixed delay for precessing each frame. Finite memory is taken into account by dropping frames if total number of bits enqueued exceed a given limit.

A simple scheme for sending PAUSE frames is built in (although users will probably change it). When the buffer level goes above a high watermark, PAUSE frames are sent on all ports. The watermark and the pause time is configurable; use zero values to disable the PAUSE feature.

Usage diagram:

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Inheritance diagram:

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Parameters:

Name	Type	Default value	Description
addressTableFile	string	""	see MACRelayUnit
addressTableSize	int	100	see MACRelayUnit
agingTime	double	120s	see MACRelayUnit
numCPUs	int	1	number of CPUs
processingTime	double	0s	processing time of one frame
bufferSize	int	1MB	memory
highWatermark	int	512KB	buffer usage threshold to send PAUSE frame
pauseUnits	int	300	time to put in PAUSE frames (in units of 512 bit times)

Properties:

Name	Value	Description
display	i=block/switch

Gates:

Name	Direction	Size	Description
lowerLayerIn [ ]	input
lowerLayerOut [ ]	output

Source code:

//
// A MACRelayUnit implementation which models one or more CPUs
// with shared memory, working from a single shared queue.
//
// It also models fixed delay for precessing each frame.
// Finite memory is taken into account by dropping frames if
// total number of bits enqueued exceed a given limit.
//
// A simple scheme for sending PAUSE frames is built in (although
// users will probably change it). When the buffer level goes
// above a high watermark, PAUSE frames are sent on all ports.
// The watermark and the pause time is configurable; use zero
// values to disable the PAUSE feature.
//
simple MACRelayUnitNP like MACRelayUnit
{
    parameters:
        string addressTableFile = default("");  // see MACRelayUnit
        int addressTableSize = default(100); // see MACRelayUnit
        double agingTime @unit("s") = default(120s); // see MACRelayUnit
        int numCPUs = default(1);  // number of CPUs
        double processingTime @unit("s") = default(0s);  // processing time of one frame
        int bufferSize @unit("B") = default(1MB);  // memory
        int highWatermark @unit("B") = default(512KB);  // buffer usage threshold to send PAUSE frame
        int pauseUnits = default(300);  // time to put in PAUSE frames (in units of 512 bit times)
        @display("i=block/switch");
    gates:
        input lowerLayerIn[] @labels(EtherFrame);
        output lowerLayerOut[] @labels(EtherFrame);
}