JPH0294735A - Command processing system for line controller - Google Patents

Abstract

PURPOSE:To prevent the increase of hardware or the like due to the increase in buffer quantity caused by the increase in number of lines by processing a command commanding one and same transmission protocol processing to plural lines through a queue for each line. CONSTITUTION:Suppose that a host system writes a command commanding one and same transmission protocol processing to all lines (n) to a command queue 201 in a memory 2 via a bus 5. A line pointer B2 is 0 in the initial state, the transmission protocol processing is executed to a line 0 and a line pointer 132 is revised to point out the line 1 when the processing of the line 0 is finished. Then whether or not the line pointer is equal to all the line number (n) is discriminated, and when they are not equal to each other, that is, the processing for all the lines is not finished, a queue pointer 202 is not revised and the processing is finished. when a CPU reads a transaction in the queue next, since a de-queue pointer 202 points out the same command, the command is read again, the transmission protocol processing is applied to a line 1 and the line pointer 132 is revised to the line 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a line control device that receives commands from a host system and controls transmission procedure processing for multiple lines, instructing the transmission procedure processing for multiple lines with a single command. Regarding the command processing method for commands to be used.

[Conventional technology]

The conventional device is manufactured by IEICE, Exchange Research Fund, 5E-86-78 (
1985), as described on pages 19 to 24, the system accepted commands from the host system via a queue and processed them all at once from the start to the end.

[Problem to be solved by the invention]

Since the above-mentioned conventional technology is applied to a device that controls transmission procedure processing for one line, the following problems arise when this technology is applied to a device that controls transmission procedure processing for a plurality of lines.

In other words, when a higher-level system instructs multiple lines to perform the same procedure, it is better for the higher-level system to combine them into one command than to issue multiple commands for each line. The load is reduced. Figure 2 shows an example of the processing flow of a command that instructs the same processing for all n lines from line O to line n-1.
Shown in b). However, in this method, one command is a processing request for a plurality of lines, so if processing is performed all at once from the start of processing to the end of processing, the processing time increases in proportion to the number of lines. Therefore, during this processing time, transmission and reception processing on the line that requires real-time performance cannot be executed, so it is necessary to provide a sufficient number of transmission and reception buffers, which increases the amount of hardware. Also, if the sending and receiving buffers are made larger, the processing delay caused by the buffers will increase.
Real time nature is lost.

An object of the present invention is to solve the above problems.

[Means to solve the problem]

The above purpose is to provide a means for storing the completion or incompleteness of execution of a command in the link surface when processing a command that instructs multiple lines to perform the same transmission procedure processing, and to transmit the command from the upper system via a queue. When is issued, selects the line on which the command has not been processed (at this time, all lines are unprocessed), executes the transmission procedure process for one line, and completes the execution of the command on the line. remember what you did,
Determine whether the command has been executed for all lines, and if it has not been executed for all lines, do not perform dequeue processing, leave the command in the queue, read it again, and leave it unexecuted. It is used as the activation factor for the transmission procedure processing of the line, and when all line execution is completed, dequeue processing is performed.
This is accomplished by discarding the command from the queue.

[Effect]

It operates to process a command that instructs multiple lines to perform the same transmission procedure process via a queue for each line. As a result, it is possible to arbitrarily set the period from the end of processing of one line until the start of processing of the next line, and during this period, processing can be executed by an activation factor other than a command. The CPU occupation time due to command processing is the processing time for one line, and remains constant even if the number of lines increases.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows transmission control procedures, such as CCITT, I44
1 is an overall configuration diagram of a line control device that performs APD procedure processing as defined in 1. In the LAPD procedure, it is necessary to set up multiple logical lines (layer 2 links) on one physical line and control them simultaneously.The line control device 1 is connected to the upper system via the common memory 2.Line The control unit @1 is composed of a memory 11 for storing a program, a CPU 12 for executing the program, a memory 13 for storing constants and variables for executing the program, and a line input/output unit 14 for transmitting and receiving frames on the line. .Memory 11 and C
The PU 12 is connected by a bus 3, and the CP tJ 12, the memory 13, the line input/output 14, and the memory 2 are connected by a bus 4. Further, the memory 2 is connected to the host system via a bus 5. The receiving line 6 and the transmitting line 7 are connected to the line person output section 14.
connected to.

Assume that the host system writes a command to the command queue 201 on the memory 2 via the bus 5 to instruct the same transmission procedure processing for all lines (=n). When the enqueue pointer 202 points to the command, the CPU reads the command via the bus 4 and starts processing. FIG. 2 is a flowchart showing the processing flow of this command. FIG. 2(a) is a flowchart of the present embodiment; FIG. After reading the command and analyzing it, it uses the line status table pointed to by the line pointer (=k) to process the transmission procedure for the line, requests the line control unit 14 to transmit a frame, It performs processing according to the state of the memory 2, such as inputting and outputting reports to the upper system. In the initial state, line pointer B2 is O, so the transmission procedure process is executed for line O. line pointer 1
32 is updated to point to line 1 to be processed next when processing for line O is completed. Thereafter, it is determined whether the line pointer is equal to the total number of lines n, and if not, that is, processing for all lines has not been completed, the process ends without updating the dequeue pointer 202. Next, when the CPU reads the transaction in the queue, the dequeue pointer 202 points to the same command, so it reads the command again, performs the transmission procedure processing for line 1, and updates the line pointer 132 to line 2. do. By repeating this process, the line pointer 132 will indicate n when the transmission procedure processing for all lines is completed, so the dequeue pointer 202 will be updated, and at the same time as the processing of the command is finished, the line pointer 132 will be updated. Clear to zero.

Since processing is divided using queues for each line, 1
Once line processing is completed, it becomes possible to perform processing other than command processing.

In this example, the same processing was instructed for all lines, but
It is also possible to instruct processing only to a specific line group defined by the line status, line type, etc.

Furthermore, in this embodiment, processing for each line is performed using a smaller line number, so that the presence or absence of command execution for each line is stored using the line pointer, and the end of command execution for all lines is determined using the line pointer. . On the other hand, it is also possible to provide a flag indicating completion or incompleteness of execution for each line and execute the above process.

(Effects of the Invention) According to the present invention, a command that instructs multiple lines to perform the same transmission procedure can be processed for each line via a queue.
The PU occupation time is the processing time for one line, which is constant regardless of the number of lines. This makes it possible to keep the amount of transmission and reception buffers constant regardless of the number of lines, and has the effect of preventing an increase in hardware and processing delay due to an increase in the amount of buffers when the number of lines increases.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of line control according to an embodiment of the present invention, FIG. 2(a) is a processing flow diagram of the same embodiment, and FIG. 2(b) is a processing flow diagram of a conventional example. 1... Line control device, 2... Memory, 3, 4.5-
bus, 6... receiving line, 7... sending line, 11...
・Memory, 12...CPLJ, 13...Memory, 1
4... Line input/output unit, 131... Line status management table, 132... Line pointer, 201... Command queue 202... Dequeue pointer. Figure 1

Claims (1)

[Claims] 1. In a line control device that accepts commands from a higher-level system via one or more queues and controls the transmission procedure processing of multiple lines according to the instructions of the command, it is possible to perform the same processing on multiple lines. means for storing completion or incomplete execution of the command for each line, reading the command from the queue, selecting one line on which the command has not been executed, and processing the transmission procedure using the command; a means for determining whether the command has been executed for all lines on which the command should be executed; and a means for dequeuing the queue if the command has not been executed for all lines. A command processing method for a line control device, comprising means for leaving the command in the queue by not executing the command.