JPS6238060A - Communication control equipment - Google Patents

Abstract

PURPOSE:To save the processing overhead of a protocol with efficient operation of layer execution section of each hierarchy by providing a layer execution section at each hierarchy corresponding to each layer of the hierarchy of the protocol so as to realize the execution of the protocol. CONSTITUTION:The layer execution section of each hierarchy is realized as a task 2 under a real time multi-task OS core 1. Further, the OS core is a known part depending on the machine among the software constituting the operating system. The independency of the layer execution section of each hierarchy is realized by the independency of the task possible for order or reception of an event and the parallel operation of the layer execution section (layer task 2) of each hierarchy is realized by the parallel operation of the multi-mask OS core 1 to execute the protocol. Further, the data for operation of each layer task 2 is stored in a buffer 3 in common with the layer task 2 and the reception/transmission of the data between adjacent tasks are executed by the address transfer where data exists.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a communication control device, and more particularly, to a communication control device that executes and controls communication having a protocol layered structure.

BACKGROUND OF THE INVENTION In recent years, in order to ensure smooth and reliable communication between arbitrary computers or between computers and terminals (computer network), various levels and levels have been developed, ranging from the control level of communication lines to the control of user programs. Various communication protocols (protocols) have been created according to the functions required by each system, and their standardization is being promoted.

Particularly in the field of data communications, the protocol is Ba5icRefere 130 (International Organization for Marking).
Standardization is promoted by a seven-layer network architecture based on the nce Model.

In this 7-layer protocol, functions close to physical lines to communication functions of application programs are classified and organized into 7 layers, and each layer is given a definition of each function. .

Each layer to which such function definitions are assigned is called a layer, and the seven-layer protocol is composed of seven layers.

The execution of each layer is generally performed using a communication network with a slow line speed (for example, 9.s kbps to 64 kbps).
In the past, in the majority of cases, the system operated as follows.

Problems to be Solved by the Invention However, recently, as typified by LAN (Local Area Network), the conventional line speed io
Lines that are up to 10 times faster than usual will be used, and line speeds sufficient to meet the demands for high-speed transfer of large amounts of data, such as computer files and facsimile images, will be achieved. It was.

However, if we look at the current communication control device, the following points can be found in the case of H: 1. It relies on a general-purpose CPU to execute the protocol.

2. Since the communication data flows through the system bus, the bus is monopolized and the flow of protocol data is obstructed, which increases the overhead time required to execute the 7-layer protocol described in a. This was a problem because the time required for protocol processing was much longer than the actual transfer time on the line.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a communication control device that reduces protocol processing overhead and enables high-speed processing.

Means for Solving the Problems In order to achieve the above object, the communication control device of the present invention includes:
The present invention is characterized by having layer execution units that correspond one-to-one to each layer of the protocol and can operate in parallel with each other.

Effect: A layer execution unit capable of high-speed processing can be provided according to the load of each layer, and the processing capacity of the layer execution unit can be determined independently of the processing capacity of other layer execution units.

In addition, the data of each layer execution unit that can be processed at high speed is
The data does not flow through the system bus of the control CPU, but instead flows through a path dedicated to the layer execution unit.

Because of this, the overhead time for executing the protocol is shortened, and the processing overhead of the protocol can be reduced.

Embodiments Hereinafter, embodiments of the communication control device of the present invention will be described with reference to the drawings.

By the way, since the protocol is configured with a plurality of layers in a hierarchical structure as described above, the layer execution unit for each layer also has a hierarchical structure.

Therefore, first of all, regarding the layer execution part of this hierarchical structure,
The common basic performance is listed below. The data flow of the layer execution unit of each layer is limited to the exchange with the layer execution unit of one layer adjacent above and below (left and right in the drawing).

2. The layer execution unit of each layer starts its operation by the arrival of data from the layer execution unit of both the upper and lower layers, or by an event generated within the layer execution unit by, for example, a timer. The execution unit can be positioned as an event-driven independent element.O 3. The data flowing through the layer execution unit of each layer is often the same except for the header part.

Taking the above points into consideration, the explanation will be continued from FIG. 1 in the following order.

Figure 1 is a block diagram showing the software structure of the communication control device using software implementation and the data flow of the layer execution unit. This was realized as Task 2. Note that the OS core here is a known part of the software that constitutes the operating system that depends on the machine.

In this embodiment, the independence of the layer execution unit of each hierarchy is realized by the independence of tasks that can order or receive events, and the parallel operation of the layer execution unit (layer task 2) of each hierarchy is realized by the multitasking OS. The protocol is executed by realizing the parallel operations of core 1.

Note that data for each layer task 2 operation is stored in a shared buffer 3 of the layer task 2, and data transfer between adjacent tasks is performed by passing the address where the data exists.

In FIG. 1, layer task 2 (left end in the drawing), which is the lowest layer execution unit, guarantees the flow of data to the physical line. Furthermore, the topmost layer task 2 (at the right end in the drawing) executes an application protocol. The same applies to FIGS. 2 and 3, which will be described later.

FIG. 2 shows an embodiment in which the layer execution unit 2 of each hierarchy is separated from the control CPU 4 as independent execution hardware.

In this embodiment, each data in the layer execution unit 2 of each hierarchy does not flow through the system bus 5, but is passed between the layer execution units 2 of each hierarchy like a bucket brigade to execute the protocol.

Note that the layer execution unit 2 of each layer is a data flow machine that starts protocol processing upon arrival of data from an adjacent execution unit.

In FIG. 3, data transfer between the layer execution units 2 in FIG. 2 is eliminated, and a shared buffer 6 of the layer execution units 2 corresponding to each hierarchy is provided. Data is exchanged (protoful execution) between the two. Each shared buffer 76 is connected to each layer execution unit 2.
Contains data for executing protocols according to the protocol.

Therefore, in this embodiment, data is not physically moved between each layer execution unit 2. 1, each data of each layer execution unit 2 does not flow to the system bus 5 either.

As described in detail, the present invention provides a layer execution unit for each layer corresponding to each layer of the layered structure of the protocol to realize the execution of the protocol. The efficient operation of the layer execution unit of the hierarchy reduces the processing overhead of the protocol, which has the effect of making it possible to achieve high speed and high reliability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a communication control device according to one embodiment of the present invention, FIG. 2 is a block diagram of another embodiment, and FIG. 3 is a block diagram of still another embodiment. 1... Real-time multitasking OS core, 2
...Layer execution unit (layer tasks L3, 6...
...Shared buffer, 4...Control CPU, 5.
...System bus 〇 Name of agent Patent attorney Toshio Nakao and 1 other person 1st
Figure 2

Claims (1)

[Claims] For each layer consisting of a hierarchical structure of communication protocols (protocols) stipulated to ensure smooth and reliable communication between computers or between computers and terminals, a layer execution unit that executes the layer of each layer is provided. Provided for parallel operation,
A communication control device characterized in that a protocol is executed by the layer execution unit of each layer.