KR930001199B1 - Method for processing data in lan - Google Patents

Abstract

The method enables a LAN having a number of network operating systems (NOS) to support the NOS's simultaneously. It is composed of an interface (I/F;1) for interfacing between application softwares or users, a protocol machine (2) for supporting protocols and various network services, a network driver (3) for connecting a network software to a corresponding network hardware, and a memory (4) for buffering the data received or to be transmitted.

Description

Data processing method of LAN with multiple NOS

1 is a block diagram illustrating a conventional LAN.

FIG. 2 illustrates the LAN protocol in relation to FIG.

3 shows the ratio of the invention in FIG. 2;

4 is a block diagram schematically showing the configuration of this invention.

5 and 6 illustrate an implementation of the path control unit of the present invention.

7 is a hardware diagram for implementing a LAN of the present invention.

8 and 9 are state diagrams respectively describing data and reception.

10 and 11 are flowcharts detailing a path control transmitter and a NIC transmitter in data transmission.

12 and 13 are flowcharts describing the path control receiver and the NIC receiver in detail in the case of data reception.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of computer networks, in particular to a local area network (LAN), and to a data processing method of a LAN having a plurality of NOSs capable of simultaneously supporting a plurality of NOSs.

In general, the term 'LAN' is a widely accepted definition. It is a network that does not use the public network. It is a system that organically combines computers and terminals installed in the same building and in complexes such as factories, universities, and research institutes. By improving the reliability, scalability and responsiveness according to the purpose, the improvement of performance, load distribution and availability are realized. In other words, a LAN is a network for communication between various data devices, such as a computer, a terminal, a word processor, a personal computer, a facsimile, etc. in a region, and is a public communication line such as a telephone network, a leased line, and a DDX. Network). However, in some cases, it is a network that is highly developed for comprehensive network such as large-scale network configuration by combining with public network.

As a data device connected to the last end of the network, a computer, that is, the data device with a built-in network interface circuit, is referred to as a network terminal in the following description, and the network terminal is represented on the network by using FIG. Explain.

When a LAN is formed, an interface (I / F) 1 for connection of application software or a user, as shown in FIG. 1, in order to transfer a user or application software from a network terminal to a network or to obtain information from another network terminal. ), A protocol machine (2) having software necessary for network operation, providing communication protocols, protocol definitions and various network services, a network driver (3) connecting network software and network hardware connected thereto, A storage device 4 as a buffer for temporarily storing data received from the network and data to be transmitted to the network, and a network interface control (NIC) called the network hardware as a control unit for transmitting / receiving data from the network. , Connected and the address in the drawing is four It is a unique address assigned to the work station.

In addition, the network operating system (NOS) in the drawing includes the user interface 1, the protocol machine 2, and the network driver 3 mentioned above.

In the protocol, a short distance is transmitted and a single transmission path is often shared. Therefore, routing and traffic control are relatively simple, so the protocol is also simple.

The protocol features of the LAN are shown at the lower levels of the physical and data layers in the LAN protocol model, as shown in Figure 2 (a). The intention of using these protocols is to provide a common basis for the development of standards for various protocols for the purpose of interconnection between systems, and to provide a sufficient relationship between existing standards and future standards. This invention also uses the same protocol as in FIG.

In FIG. 2, the physical layer, which is the first layer (layer 1), sets up a physical link by modeling a telecommunication line and performs an electrical control function for performing bit transmission. Subsequently, the data link layer, which is the second layer (layer 2), operates on a frame basis and indicates data transmission between adjacent systems over a physical link.

A network layer, a transport layer, a session layer, a presentation layer, and an application layer, which are the third to seventh layers included in the protocol machine 2 in the NOS of FIG. 2, are schematically described below.

The network layer, which is a third layer (layer 3) operated on a packet basis, exists for a case of performing data transmission between systems in which a molten entity that communicates through one or more communication networks exists.

The fourth to seventh layers described below operate on a message basis.

The transport layer, which is layer 4, complements the conceivable services in adjacent network layers with sessions, and is concerned with end-to-end control for full-duplex, transparent data transmission services in an economical and quality manner. do. In the third layer above, the fourth layer (and further layers described below) relates to end-to-end interactions between user processes, as compared to the interface between the user and the network.

The session layer, which is the fifth layer (layer 5), does not affect the upper layer above the fifth layer in case of transmission failure. For this purpose, if the transmission connection is disconnected, the session layer connects to a new transmission line and continues transmission. It establishes and maintains a connection, called a session, between a pair of processes measured by.

The presentation layer, which is layer 6, performs the function of converting data into a generally useful form before sending it to the fifth layer. That is, as a common function of various protocols existing in the seventh layer described below, the meaning of data is changed, the code and structure of the data are input, the change display is controlled, and the like.

The application layer, the seventh layer, is a higher-level function provided to support the operation of an application or system, including operator support, remote data use, file transfer control, distributed database operations, and level conversations. Functions belong to this.

The above description outlines a general LAN protocol and operates in conjunction with FIG. 1 and the conventional network terminals generally support only one conventional NOS and protocol.

The above-mentioned LAN protocol, namely Xerox's model name Exnetnet system, which physically realizes this in the seventh layer, which is a reference model of Open System Interconnection (OSI) of ISO (International Standard Oraganization). In the example, the LAN protocol gives the practical implementation of the first layer and the second layer. That is, for the physical layer corresponding to the first layer, a transceiver, a cable for transmitting and receiving data over a coaxial cable, and an Ethernet controller for a data link corresponding to the second layer are used.

And, as shown in FIG. 2, detailed descriptions of the three to seventh layer protocol machines are described in the "Appearance of Secure Memory Isnet" of the present patent applicant's patent application No. 89-5704. How to protect your card's buffer RAM. Namely, an apparatus for realizing the conventional method; In other words, a network terminal device supporting only one NOS is a circuit of a carrier sense muteple access (CSMA) type dual network method, which uses a schematic configuration in the present invention.

As described above, in order to connect two or more computers to exchange information with each other, the interface with the protocol and application software included in the network operating system (OS) must match.

However, although conventional network terminals generally support only one type of NOS and protocol, various types of different NOS and protocols are currently developed and distributed in the market, which makes it difficult to exchange information between different MOS and protocols. have.

In other words, it is desired to use two or more NOSs and protocols simultaneously in one network terminal even though the existing general system is used and different NOSs and protocols exist.

Accordingly, an object of the present invention is to provide a general-purpose LAN system and a method of operating the same, in which two or more NOSs and protocols can be simultaneously used in one network terminal when different NOSs and protocols exist in a network based on the existing apparatus and method. To provide.

With reference to the accompanying drawings, a general-purpose LAN system implemented in accordance with the object of the present invention and the software provided to operate the same.

As mentioned above, the present invention uses the conventional method without major modifications, but includes the idea of the present invention in the data link layer, which is the second layer in the LAN protocol, to support a large number of NOSs and protocols.

This is illustrated in FIG. 3, which only shows the second layer of FIG. 2 in accordance with the present invention, which includes a network driver, a path controller, and a network interface control.

The configuration of the present invention will be described with reference to FIG. 4 along with the contents of FIG. In FIG. 3 and FIG. 4, the same reference numerals are used for the same parts as in FIG.

In FIG. 4, the NOS is n 1 / f (1-1,1-2,1-n) and n protocol machines (2-1,2-2,2-n) connected to the user or the melting software, respectively. , n network drivers 3-1,3-2,3-n are shown. The network driver of the NOS is all connected to the path control section 5 of the present invention. The path control unit allocates a path through which data flows, that is, a path for transmitting and receiving data, between the n memories connected thereto, and controls mutual relationships. In addition, the NICs connected to the memories 4-1, 4-2, and 4-n have all the conventional functions, and a function for supporting the n memories according to the present invention is added.

In the related art, although address assignment is one, in the present invention, n addresses are used to allocate unique addresses of a network terminal and n NOSs. This block consists of a PROM or a switch containing n addresses. For example, the address configuration according to the present invention uses 16 different NOSs and is designated as 6 bytes in size, where OX12345X (where OX12345 is In the network terminal designated by the hexadecimal representation method and X is a randomly allocated number), the first NOS may be differently designated as OX123450, the second NOS as OX123451, the 16NOS as OX12345F, and the like.

The path controller, which is a feature of the present invention, is included in the second layer of the LAN protocol, and as mentioned in the physical system implementation, the realization of the first layer and the second layer depends on the Ethernet card, and the path controller is shown in FIG. It exists in the second layer of the LAN protocol and is implemented in software.

The path controller 5 will be described in detail below.

The path controller is implemented in software, and the implementation is implemented differently depending on the case where the OS operating system characteristics are multi tasking and the single tasking.

In the case of a multi-tasking OS, as shown in FIG. 5 illustrating the principle, a new process for path control is created, namely, an inter-processor communicasion provided by the OS of the network terminal to be implemented, that is, locking and unlocking. It is implemented using the method of variable variable by (locking and un-locking) or message passing method by sending / receiving.

In the case of a single-tasking OS, as shown in FIG. 6, the IBM-PC is implemented in the same manner as a RAM resident program or a device driver. 6 shows an example in which a single task OS and a path control program reside between n NOSs and a computer OS.

The data by the path control unit is transmitted and received to n memories. The n memories are buffers for temporarily storing the data received from the network and the data to be transmitted to the network, and there are as many memories as the number of protocol machines. Is the number of protocols that the network terminal can service to the maximum.

The NIC (network interface contral) connected to the memory may be implemented by various methods such as the conventional method for controlling a network and transmitting / receiving data, that is, the aforementioned CSMA method and the tocking method. It adds the ability to control n memories, or n buffers, to handle the unique address of the network terminal, which consists of hardware.

As a specific example of an apparatus for physically realizing the configuration and operation of the present invention described above, as shown in FIG. 7, the basic skeleton is based on a three-memory type Ethernet card, but according to the present invention, n It has a structure of adding a function of managing four buffers, a memory structure having n buffers, and a PROM or switch configuration having n addresses.

FIG. 7 shows a connection between a data processing device 6 such as a PC and a storage device 4, a NIC, and an address block in FIG. The CPU and main memory 7 included in the data processing apparatus are interconnected as data paths to an Ethernet controller input / output port (NCP), and the NCPs are interconnected as respective memory data paths in the storage device.

In addition, a plurality of control signals are connected between each block to facilitate data transmission. Details thereof can be easily found in the above-mentioned literature.

The various programs related to FIG. 4 are stored in the main memory of FIG. 7, and the hardware related to FIG. 4 are connected and act organically as shown in FIG.

Since the path control unit 5 is interposed between a plurality of NOSs and a plurality of memories to operate adaptively to different NOSs and protocols, the present invention will be described with reference to the accompanying drawings for each case of data transmission and reception. do.

First, data transmission in the system of the present invention will be described. In the data transfer state, five states are achieved. If this is listed, the upper layer, the path control transmitter, the NIC transmitter, the K-th buffer, and the network, and the upper layer means the NOS as the upper layer for the path control.

The path control transmitter is a transmission module of a path control layer, the NIC transmitter is a storage module for temporarily storing data to be transmitted, and the network means a transmission channel to which a network terminal is connected.

As shown in FIG. 8, which is an accompanying drawing for data transmission, when a data transmission request is requested from the K-th NOS to the path control transmitter in the upper layer, the path control transmitter is invoked. The path control transmitter then writes data to the K-th buffer, which is the data received from the upper layer.

The path control transmitter informs the NIC transmitter when the upper layer packet is written to the requested buffer. The NIC transmitter, which has passed through this fact, reads a packet from the Kth buffer. The NIC transmitter then creates a frame in the format it will send to the network and sends it to the network.

If a packet in the K buffer is sent, the NIC transmitter informs the path control transmitter of this fact (D.T.complete). The path control transmitter then informs the Kth NOS of the final result to complete the data transfer.

Next, the case of data reception will be described.

In the case of data reception, the reverse order is carried out similar to the case of data transmission described above. This will be described in detail with reference to FIG.

In the data reception state, it is performed by five states as follows.

If this is listed, the upper layer path control receiver (receiver), the NIC receiver, the K-th buffer, the network, and the upper layer means the NOS as the upper layer for the path control. The path control receiver is a reception module of a path control layer, the NIC receiver is a transmission module of a NIC layer, a Kth buffer is a storage location where data to be received is temporarily stored, and a network is a transport channel to which a network terminal is connected.

Receive the data corresponding to the K th NOS from the network as shown in FIG. Then, the NIC receiver receiving the data writes the data of the received frame to the K-th buffer. If a packet is written to the Kth buffer, it is notified of the path control receiver. (D.C. Information).

The K-th NOS (upper layer) responds to the receipt of the received packet, reads the packet from the K-th buffer, and provides it to the upper layer (D. R. data read). Notifies the NIC receiver that the packet in the Kth buffer has been delivered to the upper layer (D.R.Done) and completes data reception.

The case of data transmission and reception has been described as above, but the path control transmitter, the path control receiver, the NIC transmitter, and the NIC receiver will be described with reference to the flowchart for clarity.

First, a flow chart is shown in FIGS. 10 and 11 for a path control transmitter and a NIC transmitter.

FIG. 10 is a flowchart related to a path control transmitter. In this step, it is determined whether a service, that is, a DT request or a DT completion request (see FIG. 8 or FIG. 9) is requested, and if it is a DT request according to each service request, the K th buffer. The packet received from the upper layer is written (DT date), and then the NIC transmitter is informed that the packet is transmitted in the buffer along with information such as a buffer number (K in this example), a destination address, and a pointer. (DT information) Then, the process returns to the step of requesting or not (because this flowchart is limited to the path control transmitter) and informs that all data has been transmitted from the NIC transmitter, that is, if the service request is DT completed, the step of DT response is performed. It proceeds to inform the upper layer that the packet in the Kth buffer has been transmitted to the network (DT response), and returns to the step of requesting service.

Next, with respect to the path control transmitter, the NIC transmitter will be described with reference to the flowchart of FIG. The NIC transmitter first determines whether there is a packet transmission request, and if so, the D.T. Proceeds to the data read step, and reads a packet from the Kth buffer. Subsequently, the process proceeds to the transmission step, and creates a frame in a format to be transmitted with a header including information such as the destination address, the source address, and transmits it to the network. The path control transmitter is then informed that the packet in the Kth buffer has been sent to the network (D.T.Done). The NIC transmitter returns to the step of requesting packet transmission again and waits.

Next, a path control receiver and a NIC receiver will be described with reference to FIGS. 12 and 13.

12 shows the operation flow chart for the path control receiver.

As with the path control transmitter, D, R, Information, D.R. First, it determines whether or not the response is a service request, and if it is D.R.information, proceeds to the D.R.requirement step and informs the upper layer with the buffer number, source address, and point information that there is a received packet in the Kth buffer. Thereafter, after returning to the service requesting step, there is a DR response service request, and proceeds to the DR data reading step, and informs the NIC receiver that the packet is provided from the Kth buffer to the upper layer with information such as buffer number and point. Notify (DR completed), and returns to the step of requesting the service and wait.

13 is a flowchart related to the NIC receiver.

The NIC receiver first determines whether a frame is received from the network or there is a service request from the path control receiver. Here the service request is D.R.Completion.

When a frame is received from the network, it is determined whether the destination address of the received frame is included in the address block. If the destination address is included in the address block, as a lease service, the DR data write step is performed to correspond to the destination address. The received frame data is written to the buffer, and the process proceeds to the DR information step to inform the path control receiver of the received packet with information such as the buffer number, destination address, pointer, and the like. Return to step

If the destination address of the frame received in the determining step is not included in the address block, the method ignores or passes the packet, and the case corresponds to the token pass method. .

If the service request is D.R.complete, it recognizes that the path control receiver has taken the packet from the K-th buffer, and returns to the above-described plane reception or service request.

As described above, when the method according to the present invention is applied to multiple network operating systems in one network at the same time, one type of network terminal at the same time without reset, i.e. power on / off or reinstallation (reinstallation) Can support NOS.

Claims (6)

In the data processing method of a computer network LAN composed of a plurality of NOSs, a path control unit, a plurality of storage devices, and a NIC and a network, data transfer is performed by requesting data transfer from one of the plurality of NOSs in the upper layer. A DT request step required by the path control transmitter of the step; and a DT data write step of writing the data to be transmitted to the buffer which is the storage device corresponding to any one of a plurality of NOSs. Is a data processing method of a LAN having a plurality of NOS, characterized in that the step of reading the transmission data in the buffer and transmitting to the network. The method of claim 1, wherein the path control transmitter transmits a DT response step of determining a data transmission request or a service request of completion, and, when a data transmission request, writes the transmission data to a buffer and indicates that the transmitted data is in the buffer. The data processing method of the LAN having a plurality of NOS, characterized in that further comprising a transmission information step, and when the data transfer is completed, the data transmission response step to inform the Saury layer that the data in the K-th buffer is transmitted to the network. The method of claim 1, wherein the NIC transmitter determines whether there is a data transmission request, reads data from the K-th buffer when the data transmission request is requested, and a format to be transmitted together with the header including information of a destination address, a source bug, and the like. After the frame is made, the LAN having a plurality of NOS further comprising the step of transmitting to the network, and notifying the path control transmitter that the packet in the K-th buffer was transmitted to the network (data transmission completed) How data is processed. In the data processing method of a computer network LAN composed of a plurality of NOSs, a path controller, a plurality of storage devices, and a NIC and a network, data reception includes a receiving step of receiving a frame corresponding to a Kth NOS from a network by a NIC receiver; The NIC receiver writes data of the received frame to the K-th buffer of the storage device, and the DR data writer step, and the path control receiver transmits the received data to the K-th NOS to layer data from the K-th buffer. A data processing method of a LAN having a plurality of NOS, characterized in that provided in the step. 5. The method of claim 4, wherein the path control receiver determines whether a service request is received for data reception information or a response, and when the data reception information is received, a buffer number, a source address, a pointer, and the like are received. Notifying the upper layer with the information of the upper layer, and in response to the data reception, reads data from the Kth buffer and provides it to the upper layer. The method of processing data of a LAN having a plurality of NOSs, further comprising the step of informing the receiver. 5. The method of claim 4, wherein the NIC receiver determines whether a frame is received from the network or a service request is received from the path control receiver, and when receiving a frame from the network, the destination address of the received frame is an address. Determining whether or not it is included in the block, writing the received frame data to the buffer corresponding to the target address, and informing the path control receiver that there is data received, and upon completion of data reception, the path control receiver receives the data. LAN data processing method having a plurality of NOS further comprising the step of recognizing.

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