JPH03267848A - Collection system for trace data - Google Patents

Abstract

PURPOSE:To collect a variable length of control part data at connection or interruption of a packet by using a transmission/reception buffer as a trace buffer only at the connection or interruption in the unit of logic channel of a packet level and informing the variable length control part data in the packet to a CPU. CONSTITUTION:A flag of a transmission/reception buffer memory 18 is set at the processing of a packet connection or interruption by a packet transmission/reception processing means 19, and when the flag is set, a head address of a variable length control part data in a packet and its data length are set in the transmission/reception buffer memory 18 by a buffer management means 20, the transmission/reception buffer memory 18 is used as a trace buffer and a trace data is informed to a central processing unit 11 by the processing of a trace processing means 22. Thus, the variable length control part data at packet connection or interruption is collected. Moreover, it is not required to add a trace exclusive buffer to save the variable length control part data but the data is transferred directly from the transmission/reception buffer to the central processing unit. Thus, the collection processing is efficiently implemented.

Description

[Detailed Description of the Invention] [Summary] Regarding a trace data collection method in a communication system equipped with a central processing unit and a communication control unit, a trace that can sufficiently collect variable length control unit data at the time of connection or disconnection is provided. In a communication system having a central processing unit and a communication control unit, the purpose of which is to provide a data collection method, a packet or a transmission/reception buffer in which packets consisting of normal data are stored; a packet transmission/reception processing means that turns on the flag when processing a connection or disconnection packet and turns off the flag when processing a normal data transmission/reception packet; buffer management means that determines whether the flag is on or off, returns the transmitting/receiving buffer to an initial state when it is off, and sets a start address and data length of a packet having variable-length control section data in the transmitting/receiving buffer when it is on; trace processing means for transferring trace data to the central processing unit based on the start address and data length, and a fixed length of data being transferred from the sending/receiving buffer when processing of the packet consisting of the normal data is completed. It has a dedicated trace buffer and is configured to collect trace data related to connection establishment or disconnection processing for each logical channel.

[Industrial Field of Application] The present invention relates to a method for collecting trace data in a communication system including a central processing unit and a communication control unit.

Communication in which multiple logical channels exist, trace data is collected internally during data transmission and reception for each logical channel, and trace data is transferred to the CPU via a channel control unit that controls communication with the CPU for each physical line. In a control device, it is desired to collect enough trace data regarding connection establishment or disconnection processing for each logical channel in packet switching control.

[Prior Art] A conventional trace data collection method will be explained based on FIG. 7.

In FIG. 7, reference numeral 1 denotes a transmitting/receiving buffer provided in the communication control device, and in the transmitting/receiving buffer 1, a packet consisting of normal data or a packet having variable length control section data is stored by a packet transmitting/receiving processing section 2. is stored. Further, the packet transmission processing unit 2 configures data into a packet format and analyzes the packet.

As shown, header information and data are stored in the transmission/reception buffer 1, and the buffer management unit 3 refers to the header information and transfers the data to the trace buffer 4 by a fixed length of, for example, 64 bytes.

The trace processing unit 5 transfers the trace data to the CPU based on the header information. That is, trace buffer 4
A fixed amount of data is sequentially transferred from the sending/receiving buffer 1, and when the data area of the trace buffer 4 becomes full or when a trace collection stop request is received from the CPU, the trace processing unit 5 transfers the trace data to the CPU. Notification will be given.

[Problems to be Solved by the Invention] However, in such conventional trace data collection methods, only a finite and fixed length of trace data is collected in the trace buffer within the communication control unit. On the other hand, since the data of the control unit at the time of connection or disconnection at the packet level is variable length, it is necessary to collect enough control unit data at the time of connection or disconnection, which is most necessary for analysis at the packet level. The problem was that it was not possible.

The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide a trace data collection method that can sufficiently collect variable length control unit data at the time of connection or disconnection. The purpose is

[Means to solve the problem] FIG. 1 is a diagram explaining the principle of the present invention.

In FIG. 1, 11 is a central processing unit, 13 is a communication control unit, and 8 is a packet or normal data that has a flag provided in the communication control unit 13 and is controlled to be turned on/off, and has variable-length control unit data. 19 is a packet transmission/reception processing means that turns on the flag when processing a connection or disconnection packet and turns off the flag when processing a normal data transmission/reception packet; Buffer management means that determines whether the flag is on or off, returns the transmitting/receiving buffer 18 to an initial state when the flag is off, and sets the start address and data length of a packet having variable-length control unit data in the transmitting/receiving buffer 18 when the flag is on; 22 is a trace processing means for transferring trace data to the central processing unit 11 based on the start address and data length; 21 is a trace processing means for transferring trace data to the central processing unit 11 based on the start address and data length; and 21, when the processing of the packet consisting of the normal data is finished, the fixed length data is sent and received. This is a dedicated trace buffer transferred from the buffer 18.

[Operation] When the packet transmission/reception processing means processes a connection or disconnection packet, the flag in the transmission/reception buffer memory is turned on, and when the flag is turned on by the buffer management means, the variable-length control part data within the packet is stored in the transmission/reception buffer memory. The start address and data length are set, the transmission/reception buffer memory is used as a trace buffer, and the trace data is notified to the solid device through processing by the trace processing means.

Therefore, it is possible to sufficiently collect variable length control unit data at the time of connection or disconnection.

In addition, there is no need to prepare an additional trace-dedicated buffer to secure enough variable-length control unit data, and data is transferred directly from the transmit/receive buffer memory to the central processing unit, making the collection process more efficient. can be done.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIGS. 2 to 6 are diagrams showing one embodiment of the present invention.

In FIG. 2, 11 is a central processing unit (CPU) having a main memory 12, 13 is a communication control device (ADP), CPU 1 is connected to ADPl3 via a physical line 14, and CPU 11 and ADPl3 are It constitutes the terminal equipment of a switched communication system. ADPl3 is connected to other terminal devices via a packet switching network.

15 is a channel control unit provided in the ADPl3, and the channel control unit 15 controls the CPUI 1 for each physical line 14.
and ADPl 3. 16 is a data transmitting/receiving section, and the data transmitting/receiving section 16 is connected to the MPU1.
Under the control of 7, data is transmitted and received with other terminal devices via the packet switching network.

Reference numeral 18 denotes a transmitting/receiving buffer. The transmitting/receiving buffer 18 has a flag that is controlled to be turned on or off, and stores a packet having variable length control section data or a packet consisting of normal data.

Reference numeral 19 denotes a packet transmission/reception processing unit as a packet transmission/reception processing means. The packet transmission/reception processing unit 19 configures data into a packet format, analyzes packets, and also uses the transmission/reception buffer 18 when processing connection or disconnection packets. The flag in the transmitting/receiving buffer 18 is turned off during normal data transmitting/receiving packet processing, and when the transmitting/receiving process is completed, this is notified to the buffer management section (buffer management means) 20.

The buffer management unit 20 determines whether the flag is on or off, and when the flag is off, it transfers the normal data in the sending/receiving buffer 18 to the trace dedicated buffer 21, returns the sending/receiving buffer 18 to its initial state, and when the flag is on. At this time, the start address and data length of variable-length control section data within the packet are set in the transmission/reception buffer 18, and the trace processing section (trace processing means) 22 is requested to perform trace processing as a trace buffer.

The trace processing unit 22 notifies the CPU 11 of the trace data via the channel control unit 15 based on the start address and data length.

The trace dedicated buffer 21 has a fixed length data area,
Normal data other than connection establishment or disconnection processing is stored in the trace dedicated buffer 2 under the control of the buffer management section 20 when the packet transmission/reception processing section 19 completes the transmission/reception processing for a fixed length.
It is stored in 1. CP by trace dedicated buffer 21
Trace data is notified to the UI 1 when the data area of the trace dedicated buffer 21 becomes full or when a trace collection stop request is received from the CPU 11.

In this communication system, the communication is performed using the so-called high-level data link control procedure (HDLC), and the HDLC frame format is
As shown in the figure.

The HDLC frame format consists of a flag section (F),
Address section (A), control section (C), information section (1), frame check sequence section (Fe2) and flag section F
The information section (1) has an arbitrary bit length and is composed of a plurality of packets.

The data in the information section (■) is divided into blocks of fixed length, as shown in Figure 4, and the beam information,
A header section containing information necessary for transfer such as error control information and a transfer order number is attached, and a data block with such a header section constitutes a packet.

This packet exchange is a type of store-and-forward; instead of directly sending and receiving information between terminals, the data from the originating terminal is temporarily stored in memory by a data exchanger, and packets destined for different destinations are sent over the same transmission path. This is done by multiplexing transmission using .

Here, FIG. 5 shows an example of a packet format of a packet type (CR) for a connection different from normal data transmission/reception.

The packet format of the connection is, for example, format identifier (GFI), logical channel group number (LCGN).
), logical channel number (LCN), packet type, packet terminal address length (CLL), (CDL),
It consists of a packet terminal address, facility area, and user data, and the facility area stores control unit data that determines the conditions of the packet switching network for transfer, such as transfer speed, packet length (data length), and window size. Ru. Therefore, the packets of the connection are not of fixed length, but of variable length. Similarly, the length of the disconnection packet is variable.

Next, the operation will be explained.

The packet transmission/reception processing unit 19 turns on the flag in the transmission/reception buffer 18 when processing a connection or disconnection packet, and the buffer management unit 20 determines whether the flag is on or off. The trace processing unit 22 transfers the trace data to the main storage device 12 of the CPU 1 via the channel control unit 15 based on the start address and data length. The trace data stored in the main storage device 12 is output to a printer or a display device, and by analyzing the output trace data, it is determined whether the facility conditions are correct.

On the other hand, packets for normal data transmission and reception other than connection or disconnection are processed by the packet transmission and reception processing unit 19, and then
The fixed long bone is transferred from the transmission/reception buffer 18 to the trace dedicated buffer 21 under the control of the buffer management section 20, and is notified from the trace dedicated buffer 21 to the CPU 11.

In this way, the transmission/reception buffer 18 is used as a trace buffer to transfer packets from the connection establishment or disconnection processing section to the CPU 1.
1 as trace data, it is possible to sufficiently collect variable length control unit data at the time of connection or disconnection.

Furthermore, there is no need to prepare an additional trace-dedicated buffer to secure enough variable-length control unit data, and the trace data is directly transferred from the transmission/reception buffer 18 to the CPU 11, so the collection process can be performed efficiently. I can do it.

[Effects of the Invention] As explained above, according to the present invention, only when connecting or disconnecting in logical channel units at the packet level,
Since the transmission/reception buffer is used as a trace buffer to notify the CPU of the variable length control section data in the packet, the variable length control section data at the time of connection or disconnection can be sufficiently and efficiently collected.

[Brief explanation of drawings]

Fig. 1 is a detailed explanation of the present invention. Fig. 2 is a block diagram showing an embodiment of the invention. Fig. 3 is a diagram showing an HDLC frame format. Fig. 4 is an explanatory diagram of a packet. Fig. 5 is a connection diagram. FIG. 6 is an explanatory diagram of a transmitting/receiving buffer, and FIG. 7 is an explanatory diagram of a conventional example. 21... Trace dedicated buffer, 22... Trace processing section (trace processing means).

Claims (1)

[Claims] In a communication system in which a central processing unit (11) and a communication control device (13) are connected, the communication control device (13) includes a variable length control section having a flag that is controlled to be turned on and off. A transmission/reception buffer (18) in which packets with data or packets consisting of normal data are stored, and the flag is turned on when processing a connection or disconnection packet, and turned off when processing a normal data transmission/reception packet. a packet transmission/reception processing means (19) that determines whether the flag is on or off, returns the transmission/reception buffer (18) to the initial state when it is off, and stores variable-length control section data in the transmission/reception buffer (18) when it is on; a buffer management means (20) for setting a starting address and data length of a packet, and a buffer management means (20) for setting a starting address and data length of a packet;
Trace processing means (2) that transfers trace data to
2), and when the processing of the packet consisting of the normal data is completed, the fixed length data is transferred to the transmitting/receiving buffer (1).
8) A trace data collection method characterized by comprising a trace dedicated buffer (21) transferred from 8) and collecting trace data related to connection establishment or disconnection processing in units of logical channels.