KR0119901B1 - Method for providing transport service in unix system - Google Patents

Abstract

The present invention relates to a transport processor, the OSI transport class 0 protocol is embedded in the UNIX system kernel of a multiprocessor environment to provide a transport service at the same time the maximum number of protocol handlers in the transport protocol processor operating method It is about.

The present invention provides a stream connection module 61, a transport connection management block 62, a data transmission / reception module 63, a TPDU generation module 64, a TPDU analysis module 65, and a network connection management in a UNIX kernel of a multiprocessing environment. It consists of a module 66 and manages information between processors by locking a control block including all information necessary for transport connection management without locking each piece of information maintained for transport connection management in the UNIX kernel. To maintain consistency.

In addition, since the transport service is executed in a UNIX kernel of a multiprocessing environment, the present invention has an effect of providing a transport service to multiple users while maximizing the parallelism provided by a plurality of processors.

Description

How Transport Protocol Handlers Work in Your System

1 is a block diagram showing a relationship with hardware related to driving a transport protocol processor of the present invention.

2 is a block diagram of internal modules constituting the transport protocol processor of the present invention.

3 is a flowchart illustrating the operation of a transport protocol processor in a data transmission step.

4 is a flowchart illustrating the operation of a transport protocol processor in a data receiving step.

5 is a flowchart illustrating a data transmission step after integrating a transport connection control block and a network connection control block according to the present invention.

6 is a flowchart illustrating a data receiving step after integrating a transport connection control block and a network connection control block according to the present invention.

* Explanation of symbols for main parts of the drawings

10: processor 20: main memory

30: auxiliary memory device 40: network controller

50: UNIX kernel 60: transport handler

The present invention relates to a transport protocol processor. Specifically, an ISO transport class 0 protocol is mounted in a UNIX system kernel having a multiprocessor environment, thereby providing a transport service simultaneously with a maximum number of protocol processors at a given time. It relates to a method of operation of the processor.

In the conventional transport protocol processing, the transport protocol processor provides only one transport service at a time, and separates and manages the transport connection and the network connection, respectively, so that a lot of waiting time is required to utilize the resources of the multiprocessors. There was a problem of inefficiency in repetitive and redundant instructions.

Accordingly, an object of the present invention is to maximize the parallelism provided by a multiprocessor by providing a plurality of transport services at the same time to solve the above problems.

Another object of the present invention is to reduce the latency and eliminate the inefficiency of multiprocessors to acquire the resources necessary for the implementation by adopting a method that integrates and manages transport connections and network connections in a transport protocol processor. There is this.

With reference to the accompanying drawings to achieve the object of the present invention will be described in detail the configuration and operation effects of the present invention.

1 is a block diagram showing the relationship with the hardware resources involved when the transport protocol processor 60 is run in the system.

The system communicates between a plurality of processors (CPUs) 10 and a main memory via a local bus, and a communication between the plurality of processors (CPUs) and a network controller and a secondary storage device through a VME bus. It has a structure of a multiprocessor environment having a shared memory between the processors.

The transport protocol processor 60 is included in the UNIX kernel 50 and loaded and executed from the auxiliary memory device 30 to the main memory device 20 based on the driving time.

The plurality of processors 10 access the main memory 20 through the local bus according to the processor state, respectively, and execute the transport protocol processor 60.

At this time, if any one of the plurality of processors is running the transport protocol processor 60 to provide the transport protocol service, the service is simultaneously provided by the processor if there is a request of the transport protocol service of another processor Can be.

In addition, if there is an information object to be transmitted to the remote system, the processor requests transmission to the network controller 40 through the VME bus according to the execution result.

2 shows a relationship between the modules constituting the transport protocol processor according to the present invention.

The stream connection module 61 is connected to the upper transport user and transfers the information object from the user to the transport connection management module 62 or the data transmission / reception module 63.

In addition, the stream connection module 61 transmits the information object from the transport connection management module 62 or the data transmission / reception module 63 to the user and the information object from the lower network processor. 66) or a sub-interface that transfers the information object from the network connection management module 66 to the lower network processor.

The content of the information object handled by the stream connection module 61 is composed of primitives and required data defined in the transport protocol processor 60 and packed in the form of stream messages.

The transport connection management module 62 is a module that manages the connection of the transport protocol and is divided into a connection establishment step and a disconnection step.

The connection establishment step includes a connection request, connection recognition, a connection response, and a connection confirmation process.

The connection request process is defined through the TPDU (Transport Protocol Data Unit) generation module 64 when receiving a primitive about a connection request from the stream access module 61. A connect request TPDU is generated to request a network connection to the network connection management module 66.

The connection acknowledgment process starts if the result of the TPDU analysis is a connection request TPDU.

In the connection recognition process, resources required for managing the connection are allocated, and an information object including a connection recognition primitive is sent to the upper commercial user and sent to the stream access module 61.

In the connection response process, upon receiving a connection response primitive from the stream access module 61, a connection confirm TPDU is generated through the TPDU generation module 64 and requested to be transmitted to the network connection management module 66.

In the connection confirmation process, if the connection confirmation TPDU is a result of the TPDU analysis, an information object including a connection confirmation primitive to be sent to the user is created and requested to be delivered to the stream connection module 61.

In the disconnection step, there is a case where a disconnection primitive is received from an upper user and a network primitive management module 66 receives a primitive indicating that the network is disconnected.

When receiving the disconnection primitive from the upper user in the disconnection step, the network connection management module 66 sends a message requesting the release of the network connection and transfers the resources necessary for managing the transport connection to the system and then transports the transport. Disconnect.

In the other case, the user is notified that the network is disconnected, and all the resources necessary to manage the transport connection are transferred to the system before the transport connection is released.

The TPDU generation module 64 is a module for creating an information object in the form of a message defined by the transport processor 60 and is executed at the request of the transport connection management module 62 or the data transmission / reception module 63.

The TPDU analysis module 65 determines what type of TPDU is the information object received and executed according to the request of the network connection management module 66.

The network connection management module 66 manages the endpoints of the network connection corresponding one-to-one with the virtual circuits of the connection-oriented network processor connected to the lower side and according to the request of the transport connection management module 62 or the data transmission / reception module 63. It is responsible for passing information objects to network connections.

In addition, the network connection management module 66 responds if the information object of the network processor received from the stream access module 61 is a network primitive (service primitive exchanged between the network processor and the transport protocol processor) for network management only. If the network primitive includes data about transport connection, the data is transmitted to the transport connection management module 62 or the data transmission / reception module 63 according to the analysis result through the TPDU analysis module 65.

3 and 4 show locks on the transport connection control block and the network connection control block during data transmission and reception, thereby maintaining consistency of management information during processing, thereby allowing the transport protocol processor 60 to perform parallel processing in a multiprocessor environment. This is a flowchart configured to be possible.

3 is a flowchart illustrating a process of performing a data transmission / reception module 63, a TPDU generation module 64, and a network connection management module 66 when a transport data transmission request is generated from a user.

First, when an information object including a transport promtion is delivered from a user, the service analyzes what service the information object received from the stream access module 61 requests (S301), and then the transport connection management module 62 or the network connection. The management module 66 performs a corresponding function.

In this case, the T_DATA_REQ primitive is performed by the data transmission / reception module 63.

In this case, first, the received primitive is checked for validity (S302), and if it is not valid (S303), the user is notified of an error and ends.

If the request is valid, the associated transport connection control block (PCB) is searched for (S304).

Next, after locking the PCB found by searching (S305), it is checked whether the state of the PCB is suitable for data transmission.

In this case, if not suitable, the user is notified of an error and the execution ends, and if appropriate, the data TPDU including transport data is generated by the TPDU generating module 64 using information managed by the PCB.

After the generated data TPDU is formed as a network primitive, the network connection management control block (NCPCB) associated with the transport connection is searched (S307).

After locking the NCPCB found by searching (S308), it is checked whether the state of the NCPCB is valid (S309).

If it is not valid, notify the user that there is an error in the network connection and forward the network disconnect request (S310), transport connection control block unlock (S311), and network connection control block unlock (S312) to the remote site through the subnetwork. do.

If the state of the NCPCB is valid, a network primitive is formed (S313), and the nc_block field is checked in the NCPCB to see if data transmission is possible (S314).

If the nc_block field is set, the network data is stored in the NCPCB (S318), the unlocked PCB and the NCPCB are unlocked (S319, S320), and the execution ends.

If the nc_block field is not set, NCPCB checks whether there is previously stored data, and if there is data, sends it first, then transmits the current data to the lower network processor, and if there is no data, sends the current data directly to the lower network processor. (S315)

When data transmission is completed, the transport PCB in the locked state and the network connection management NCPCB are unlocked (S316, S317), and the execution ends.

4 is a process of performing the network connection management module 66, the TPDU analysis module 65 and the transport data transmission / reception module 63 when receiving an information object including transport data and network primitives from a remote network through a lower network processor. It is a flow chart showing.

First, when the information object is received from the lower network processor (S401), the stream connection module 61 analyzes the information object, and then the network connection management module 66 performs a corresponding function.

In the case of the N_DATA_IND primitive, the network connection management module searches for a corresponding network connection control block (NCPCB) by using information in the primitive (S402).

After locking the NCPCB found by searching (S403), it is checked whether the state of the NCPCB is valid (S404).

If not, the network connection release request (S405), the transport connection control block lock release (S406), NCPCB unlocking (S407) and the execution ends.

If the state of the NCPCB is valid, the TPDU is extracted and analyzed from the N_DATA_IND primitive (S408), and the PCB associated with the network connection is searched (S409).

After checking whether the PCB is found to be immediately locked (S410), if the lock is not possible, the NCPCB which is already locked is also unlocked (S411), and the process of FIG. 4 starts again from the beginning. .

If the PCB can be locked immediately, the lock is performed, and the state of the PCB is checked (S412), and if appropriate, the transport data is transmitted to the user (S413).

If the PCB status is not valid, a network disconnect request is made to the lower network processor (S405), and the lock of the PCB and the NCPCB in the locked state is released (S406 and S407), and the execution ends.

In the case of FIG. 3 and FIG. 4 configured to enable parallel processing of the transport protocol processor in a multiprocessor environment during the operation of the transport protocol processor when transmitting and receiving data described above, the flow of control is reversed. Code repetition frequently occurs due to backtracking.

Therefore, in the present invention, in order to eliminate the inefficiency of the repetitive performance as shown in FIGS. 3 and 4, the transport connection control block (PCB) and the network connection control block (NCPCB) are integrated and named as a transport integrated management block. In addition, when locking, only the corresponding transport management block is locked to simplify the execution step.

Also, a flow chart illustrating the operation of the transport protocol processor in the data transmission / reception step after forming the transport integrated management block in FIGS. 5 and 6 to enable more efficient parallel processing in a multiprocessing environment is shown.

5 is a flowchart illustrating a data transmission step after integrating a transport connection control block and a network connection control block.

First, when an information object including a transport primitive (a service primitive exchanged between a user and a transport protocol processor) is transmitted from a user (S501), the service object analyzed by the information object received from the stream connection module 61 is analyzed. In the transport connection management module 62 or the network connection management module 66, the corresponding function is performed.

In the case of the next T_DATA_REQ primitive, it is performed by the data transmission / reception module 63 by analyzing what the information object request is.

First, it checks whether the received primitive is valid (S502), if not, informs the user that it is an error (S503) and ends execution.

If the request is valid, the transport integrated management block is searched for (S504).

After locking the transport integrated management block found by searching, it is checked whether the status of this management block is suitable for data transmission.

If it is not appropriate, the user is notified of the error and the operation ends. If appropriate, a data TDPU including transport data is generated using the information of the integrated management block (S506) and packaged in the form of a network primitive (S507).

The nc-block field in the transport integrated management block is checked to see if the next current data transmission is possible (S508).

If the nc-block field is set as a result of the checking in step S508, after storing network data in the integrated management block (S511), the transport integrated management block in the locked state is released (S512) and the execution ends. do.

If the nc-block field is not set, the integrated management block checks whether there is previously stored data, and if there is data, sends it first, then sends the current data to the lower network processor. Is transmitted directly to the lower network processor (S509).

When the data transmission is completed, the lock is terminated after releasing the lock of the transport integrated management block in the locked state (S510).

6 is a flowchart illustrating a data receiving step after integrating a transport connection control block and a network connection control block.

First, when the information object is received from the lower network processor, the stream connection module 61 analyzes the information object (S601), and performs the corresponding function in the network connection module.

In this case, in the case of the N_DATA_IND primitive, the network connection management module 66 searches for a corresponding transport integrated management block using information in the primitive (S602).

After the lock is found, the trans-integrated management block is found (S603), and it is checked whether the state is valid (s604).

If the state of the transport integrated management block is valid, after extracting and analyzing the TPDU from the N_DATA_IND primitive (S608), the transport data is delivered to the user and the execution ends.

If the state of the transport integrated management block is not valid, a network disconnection request is made to the lower network processor (S605), the transport integrated management block is unlocked (S606), and execution ends.

As described above, the present invention integrates and manages the transport connection control block and the network connection control block in a transport protocol processor in a UNIX kernel having a multiprocessing environment, and provides transport protocol services to multiple users simultaneously. It can reduce the latency of port protocol users and improve the efficiency of transport protocol processor by improving the inefficiency that occurs when managing transport and network connections in a multiprocessing environment.

Claims (1)

In the kernel of a UNIX system having a multiprocessor environment, a stream connection module 61 connected to a higher transport user, a transport connection management module 62 for managing connection of a transport protocol, and data for transmitting and receiving transport data Transmission and reception module 63, TPDU generation module 64 to be executed according to the request of the transport connection management module 62 and the data transmission and reception module 63, and the transport connection management module 62 or data transmission and reception A network connection management module 66 which transmits an information object to a corresponding network connection according to a request of the module 63 and delivers the information object received from the stream connection module 61 to the transport connection management module or the transmission / reception data. And a transport protocol processor 60 composed of a TPDU analysis module 65 executed according to the request of the network connection management module 66. In the method, the information object received from the user is analyzed by the stream connection module 61 and then performed according to the result to be analyzed by the transport connection management module 62 or the network connection management module 66 and the data. The transmission and reception module 63 checks the validity of the information object, if not, notifies the user of an error and ends the transport protocol processing, and if the information object is valid, the transport connection control block and the network connection control. Search and lock the transport integrated management block incorporating the block, check whether the status of the transport integrated management block is suitable for data transmission, generate a data TPDU including transport data if the data transmission is suitable, and then execute the network primitive. Form, and check if data transmission is possible now. If the network data is stored in the transport management block, the block lock is released and the transport protocol processing is terminated. If the data transmission is impossible, the data is transmitted to a lower network processor and the transport management block is locked. Releasing data to end data transmission; After analyzing the information object received from the network processor in the stream access module 61, the network connection management module 66 searches for the transport integrated management block corresponding to the information object, locks it and checks its validity. If it is not valid, the network connection request is made to the lower network processor, and the transport integrated management block is released from the locked state and the transport protocol processing is terminated. A method of operating a transport protocol handler in a system comprising interpreting a TPDU and delivering the transport data to a user to terminate data reception.