JP3869127B2 - Protocol processing method and protocol processing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protocol processing method and a protocol processing apparatus, and in particular, when a data identifier included in protocol control information of an upper layer is a specific data identifier, processing corresponding to the data identifier is executed in a lower layer. The present invention relates to a protocol processing method and a protocol processing apparatus.
[0002]
[Prior art]
In general, a communication system in a plurality of systems can be expressed by a layer structure and a protocol.
[0003]
FIG. 13 shows a schematic diagram of the layer configuration and protocol according to the OSI reference model. 13, system 1-1 and system 1-2 have a common layer structure of layer (1),..., Layer (N−1), layer (N), layer (N + 1). is doing. Communication between systems is performed based on information exchange between layers. Therefore, communication between layers (N) in each system is performed using (N) protocol 401. Similarly, communication between layers (N + 1) is performed using (N + 1) protocol 402. Communication between layers in the system, such as communication between layer (N + 1) and layer (N), is performed using a service. In FIG. 13, the layer (N) 13-1 communicates with the layer (N + 1) 14-1 using the (N) service 500. Since communication between the layers (N + 1) in the system 1-1 and the system 1-2 is performed through the layers below the layer (N + 1), services in the layers below the layer (N + 1) are performed in the communication between the layers (N + 1). Are used, and each layer uses the protocol defined for each layer. The layer structure of the communication function between the systems is described in, for example, Koichi Tabata “Computer Network to OSI Tomorrow” Japanese Standards Association (1987).
[0004]
Next, FIG. 14 shows an explanatory diagram of the OSI 7 layer model. The termination system 1-3 includes an application layer 17-3, a presentation layer 16-3, a session layer 15-3, a transport layer 14-3, a network layer 13-3, a data link layer 12-3, and a physical layer 11-3. 7 layers. Similarly, the termination system 1-4 is composed of seven layers. Since the relay system 2-1 has a relay-only function, the relay system 2-1 includes three layers: a network layer 23-1, a data link layer 22-1, and a physical layer 21-1.
[0005]
Even in such a model, since communication between layers (N) uses the (N) protocol, the presentation layer protocol 416 is used for the communication between the end systems 1-3 and the end system 1-4. In FIG. 14, since communication via the relay system 2-1 is shown, the network layer uses the network layer protocol 413a between the termination system 1-3 and the relay system 2-1, A network layer protocol 413b is used between the end system 1-4 and the relay system 2-1. In the model of FIG. 14, the application layer communication between the termination system 1-3 and the termination system 1-4 is, as indicated by the communication path 310, the data that has passed through all the layers below the application layer of the termination system 1-3. The data is transmitted to the application layer of the end system 1-4 via each layer of the relay system 2-1.
[0006]
FIG. 15 is an explanatory diagram of service data units and protocol data units. There are two types of data used for communication between adjacent layers: a service data unit and a protocol data unit. Data used in the layer (N) 13-5 shown in FIG. 15 is referred to as (N) protocol data unit 21. The (N) protocol data unit 21 includes (N) protocol control information 211 and (N) service data unit 212. The data used in the layer (N + 1) 14-5 is called an (N + 1) protocol data unit 20, and has (N + 1) protocol control information 201 and (N + 1) service data unit 202. The (N + 1) protocol data unit 20 corresponds to the (N) service data unit 212 obtained by removing the (N) protocol control information 211 from the (N) protocol data unit 21.
[0007]
In the layer configuration shown in FIG. 15, when data is transferred from the layer (N + 1) 14-5 to the layer (N-1) 12-5, the layer (N) 13-5 is received from the layer (N + 1) 14-5. The (N) protocol control information 211 is added to the (N) service data unit 212 to generate the (N) protocol data unit 21 and transfer it to the layer (N-1) 12-5. At this time, the layer (N) 13-5 performs processing without being aware of the contents of the (N) service data unit 212, that is, the (N + 1) protocol data unit 20. In FIG. 15, the protocol control information 201, 211, 221 and the like of each layer is located in front of the service data units 202, 212, 222, etc., forming the protocol data units 20, 21, 22, etc., but the protocol control information 201, 211, 221 etc. There may be a case where the protocol data units 20, 21, 22, etc. are formed behind the data units 202, 212, 222, etc.
[0008]
FIG. 16 is an explanatory diagram of a communication form in the OSI 7 layer model. FIG. 16 includes, as an example, two termination systems having a termination system 1-6 and a termination system 1-7, and a relay system 2-2 that is located between them and relays data between the termination systems. An example of communication is shown.
[0009]
In FIG. 16, for example, data 321 transmitted from the termination system 1-6 includes a data identifier in the network layer protocol control information. At this time, the network layer 23-2 of the relay system 2-2 determines the content of the data identifier, and if it is a specific data identifier, performs processing corresponding to the content of the data identifier. For example, when the corresponding process is data return, the data 323 is returned to the end system 1-6. If the corresponding process is data discard, the data is discarded. If it is not a specific data identifier, the data 322 transmitted to the end system 1-7 is transmitted. Each data is involved in the processing of the layer through which the data passes.
[0010]
FIG. 17 shows an example of a configuration diagram of a conventional exchange system. This exchange system includes an external device 3-1 and an exchange 4-1. The exchange 4-1 includes line units 60a-1 and 60b-1, a switch unit 61-1, a communication control unit 62-1 and a device control unit 63-1.
[0011]
The external device 3-1 transmits data 341 to the exchange 4-1. The exchange 4-1 transfers the data 341 to the device control unit 63-1 through processing in the line unit 60b-1, the switch unit 61-1, and the communication control unit 62-1. The device control unit 63-1 processes necessary data among the transferred data, and controls each unit in the exchange 4-1 using the in-device control signal 343. In addition, the device control unit 63-1 transmits a reception confirmation 342 of the transferred data to the external device 3-1 via the line unit 60b-1.
[0012]
[Problems to be solved by the invention]
However, in the configuration of the conventional OSI 7 layer model as shown in FIG. 16, since the data identifier is included in the protocol control information of the network layer 23-2, the relay system 2-2 executes the network layer service. There must be. That is, even when there is almost no processing in the network layer 23-2 such as data to be discarded, the service up to the network layer must be performed. For this reason, there is a possibility that the amount of processing and load bottlenecks may occur between the data link layer 22-2 and the network layer 23-2.
[0013]
Further, for example, in the exchange system as shown in FIG. 17, even if there is data that is not processed by the device control unit 63-1 in the transmission data 341, the layer that is processed by the device control unit 63-1 When there is an instruction not to process data in the protocol control information, it is necessary to transmit the data to the device control unit 63-1, and confirm the instruction not to process. For this reason, unnecessary communication occurs between the communication control unit 62-1 and the device control unit 63-1, which may also become a bottleneck of the processing amount and load.
[0014]
In view of the above points, the present invention aims to reduce extra protocol processing and reduce the amount of communication between layers.
[0015]
In addition, the present invention reduces the traffic of a part that may become a bottleneck of the processing amount and load by determining the protocol control information of the upper layer in the lower layer, and improves the performance of the entire network. Objective.
[0016]
Furthermore, the present invention reduces the amount of data transferred between the communication control unit and the device control unit, improves the throughput of the device by reducing the load on the device control unit, and improves the performance of the entire exchange. With the goal.
[0017]
[Means for Solving the Problems]
In the present invention, in particular, in processing at the layer (N), a data identifier included in the protocol control information of the layer (N + 1) or higher layer is searched, and if it is a specific data identifier, the specific data The processing corresponding to the identifier is performed. On the other hand, when the data identifier is not specific, the processing of the layer (N) protocol is executed and terminated.
[0018]
According to the first solution of the present invention,
A protocol processing method (N is an integer) in a layer (N) of a plurality of layers,
A search step of searching for a data identifier for a layer greater than or equal to layer (N + 1);
A determination step of determining whether the data identifier searched by the search step is a specific data identifier;
If it is determined that the data identifier searched in the determination step is a specific data identifier, a corresponding processing step for performing processing corresponding to the specific data identifier;
On the other hand, if it is determined that the data identifier retrieved in the determination step is not a specific data identifier, a protocol processing step for executing layer (N) protocol processing
A protocol processing method is provided.
[0019]
According to the second solution of the present invention,
A protocol processing device (N is an integer) in a layer (N) in a plurality of layers,
A data processing buffer for storing received data received from a lower-level device;
A transmission buffer for transmitting transmission data to a lower-level device;
An interface connected to the host device;
A corresponding processing determination unit that searches the received data stored in the data processing buffer for a data identifier for a layer of layer (N + 1) or higher and determines whether the searched data identifier is a specific data identifier;
If it is determined that the data identifier searched by the corresponding processing determination unit is a specific data identifier, a corresponding processing unit that performs processing corresponding to the specific data identifier;
If the data identifier retrieved by the corresponding process determination unit is determined not to be a specific data identifier, a protocol process for executing layer (N) protocol processing and transferring data to the host device via the interface Part
A protocol processing device comprising:
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a flowchart showing an outline of protocol processing according to the present invention. In the present invention, in the layer (N) process, a search step 101 for searching for data identifiers of the layer (N + 1) or higher is performed. Next, a determination step 102 for determining whether or not the data identifier searched here is a specific data identifier is executed. The specific data identifier will be described later. If it is determined in the determination step 102 that the data identifier is a specific data identifier, the corresponding processing step 104 which is processing corresponding to the specific data identifier is performed, and the layer (N) processing is ended. On the other hand, when it is determined in the determination step 102 that the data identifier is not a specific data identifier, the protocol processing step 103 for executing the layer (N) protocol processing is performed, and the layer (N) processing is ended.
[0021]
In FIG. 1, the layer (N) process is terminated after the response processing step 104 is performed, but the layer (N) process is terminated after the protocol processing step 103 is performed after the response processing step 104. May be. Also, the protocol processing step 103 is performed at the beginning of the layer (N) processing, and then the search step 101 for data identifiers of the layer (N + 1) and higher and the determination step 102 for specific data identifiers are performed. The steps may be executed in the order of ending the processing of) or ending the processing of the layer (N) through the corresponding processing 104.
[0022]
FIG. 2 shows an example of a flowchart regarding application of protocol processing according to the present invention. Here, a case where the specific data identifier indicates, for example, discard or return will be described. Of course, the processing corresponding to the data identifier is not limited to discarding and returning, and any processing may be performed as long as it does not affect the layer higher than the layer handling the protocol control information including the data identifier.
[0023]
In the protocol processing method of the present invention, in the layer (N) processing, first, a search step 111 for searching for a data identifier included in protocol control information of the layer (N + 1) or higher is executed. Next, a determination step 112 for determining whether the retrieved data identifier is a specific data identifier is executed. Here, when it is determined that the data identifier is a specific data identifier, the determination is performed to determine whether the data identifier is an identifier to be discarded or returned in order to perform discard and return that are processing corresponding to the data identifier. Step 114 is performed. If it is determined that the corresponding process is discarded, a discard process step 115 is performed. On the other hand, if it is determined that the corresponding process is a return, a return processing step 116 is performed. On the other hand, if it is determined in the determination step 112 that the data identifier is not a specific data identifier, the layer (N) protocol processing step 113 is performed, and the layer (N) processing is terminated.
[0024]
In the return processing step 116, for example, when the received data is returned as it is, when a part of the received data is updated and returned, when different data using a part of the received data is returned, In some cases, data completely different from the received data is returned. Furthermore, it is possible not only to return to the transmission source but also to transfer to a different destination. At that time, the transfer destination can be appropriately set to a transfer destination in the received data or a predetermined transfer destination.
[0025]
The specific data identifier used for determination in FIG. 2 is, for example, an error identifier, a protocol identifier, an upper protocol identifier, a protocol version identifier, a data class identifier, an identifier indicating a physical line or logical line, such as a data link identifier, etc. Can be used. Of course, the specific data identifier does not need to be the one described above, the protocol processing contents, function, data type, command type, response type, error type, data priority, data length, destination address, transmission It may be an identifier or a field indicating the original address, maximum data length, presence / absence of data division, survival time, error detection code, and the like.
[0026]
As a specific communication service example, for example, when a specific data identifier has a data length, when data having a data length that is not permitted by the upper layer protocol arrives, discarding is performed in the layer protocol processing. it can. As another specific communication service example, when a specific data identifier is a destination address, in a call process, a corresponding process for rejecting an incoming call and disconnecting a connection in a lower apparatus can be executed. When a specific data identifier is a priority, it is possible to execute a handling process that discards data and does not connect to communications below a certain priority. At this time, it can be returned to the calling side that the data has been discarded. Also, if the specific data identifier is an error detection / error, the lower-level device performs error processing, discards the transmission data, or returns to the sending side to display that it is unprocessed or error, etc. It can also be executed. Further, when the specific data identifier is a destination address, a service for transferring received data to a terminal having a destination address other than the transmission source can be performed.
[0027]
Furthermore, the processing corresponding to a specific data identifier does not necessarily have to be the same processing, and the target specific data identifier is changed depending on the system or network status, or the processing content for data having a specific data identifier is changed. You may change it. As a specific communication service example, for example, when a specific data identifier is data priority, if the system processing load is heavy, the data identifier with low priority is discarded or returned, and the processing load is light In this case, even data having a low priority data identifier can be processed in the same manner as other data.
[0028]
FIG. 3 is an explanatory diagram for searching for a data identifier in the present invention. Here, as an example, (N) protocol data unit 24 and (N + 1) protocol data unit 23 are shown. Here, the data identifier 2311 to be searched in the processing of the layer (N) is included in the protocol control information 231 of the layer (N + 1). In the present invention, the data identifier 2311 is searched in the layer (N).
[0029]
As a search method, for example, when the protocol control information 241 of the layer (N) has a fixed length, the length of the protocol control information 241 of the layer (N) and the protocol control information 231 of the layer (N + 1) The total length from the beginning to the data identifier 2311 is read from the beginning of the layer (N) protocol, and the data identifier 2411 in the layer (N) is searched. If the layer (N) protocol control information 241 has a variable length and the layer (N) protocol control information 241 includes the length of the protocol control information 241, the layer (N) protocol control information 241 The total length from the beginning of the layer (N + 1) protocol control information 231 to the data identifier 2311 is read from the beginning of the layer (N) protocol, and the data identifier 2411 in the layer (N) is searched. Also, when the layer (N + 1) protocol control information 231 has an area composed of a specific pattern that does not appear in the layer (N) protocol control information 241, the specific pattern is searched and searched. The data identifier 2311 is searched by designating and reading the length from the position of the specific pattern to the data identifier 2311. Therefore, in layer (N) processing, a specific pattern included in layer (N + 1) is searched from the beginning of the layer (N) protocol, and the length from the position of the specific pattern to the data identifier 2411 is designated and read. Thus, the data identifier 2411 can be read.
[0030]
In FIG. 3, the protocol control information of each layer is located at the beginning of the protocol data unit, but it is not necessarily located at the beginning, and may be located at the end of the protocol data unit. For example, if the protocol control information 241 of the layer (N) protocol is located at the end of the layer (N) protocol, the beginning of the protocol control information 231 of the layer (N + 1) protocol and the protocol data unit 24 of the layer (N) Since the beginning of the layer (N) is the same position, the length from the beginning of the layer (N + 1) protocol control information 231 to the data identifier 2311 is read from the beginning of the layer (N) protocol data unit 24 in the layer (N) processing. Thus, the data identifier 2411 can be searched.
[0031]
Next, FIG. 4 shows an explanatory diagram of a communication form in the OSI 7 layer model to which the protocol processing according to the present invention is applied. FIG. 4 shows an example of communication composed of two termination systems 1-8 and 1-9, and a relay system 2-3 that is located between them and relays data between the termination systems. Yes. In the prior art, for example, the data identifier is determined and processed in the network layer. However, by applying the present invention, the data identifier included in the network layer protocol control information can be searched in the data link layer.
[0032]
In FIG. 4, the data 331 transmitted from the termination system 1-8 includes the data identifier in the network layer protocol control information, and the contents of the data identifier are determined in the data link layer of the relay system 2-3. If the retrieved data identifier is a specific data identifier, a corresponding process is performed according to the content of the data identifier. For example, if the corresponding process is data return, the data 333 is returned to the end system 1-8. If the corresponding process is data discard, the data is discarded. If the data identifier is not a specific data identifier, the data link layer service is performed, transferred to the network layer, and the data 332 is transmitted to the end system 1-9 in the same manner as in the communication mode using the conventional technology.
[0033]
In FIG. 4, compared with FIG. 16, the protocol processing of the data link layer 22-3 and the network layer 23-3 is reduced, and the traffic between the data link layer 22-3 and the network layer 23-3 is reduced. Decrease. Further, in FIG. 4, the data returned to the termination system 1-8 is returned earlier than before, and the data transferred to the termination device 1-9 reduces the processing of the network layer 23-3 of the relay system 2-3. Therefore, it is transmitted earlier than before. Therefore, from the end system 1-8 and the end system 1-9, it seems that the processing capacity of the relay system 2-3 is improved, and as a result, the processing capacity of the entire system is improved.
[0034]
FIG. 5 shows an example of a schematic configuration diagram of an exchange system related to the protocol processing apparatus according to the present invention. This exchange system includes an external device 3-2 and an exchange 4-2. The exchange 4-2 includes line units 60a-2 and 60b-2, a switch unit 61-2, a communication control unit 62-2, and a device control unit 63-2.
[0035]
The external device 3-2 transmits the data 351 to the exchange 4-2. The exchange 4-2 transfers the data 351 to the communication control unit 62-2 through processing in the line unit 60b-2 and the switch unit 61-2. The communication control unit 62-2 searches the transmitted data 351 for a data identifier included in the protocol control information processed by the device control unit 63-2. Then, if the retrieved data identifier is a data identifier of data unnecessary in the device control unit 63-2, the communication control unit 62-2 does not transfer the data identifier to the device control unit 63-2, The reception confirmation 353 is generated at -2, and the reception confirmation 355 is transmitted to the external device 3-2. Further, when the retrieved data identifier is a data identifier of data necessary for the device control unit 63-2, the communication control unit 62-2 transfers the data as transmission data 352 to the device control unit 63-2. The device control unit 63-2 processes the transferred data, and controls each unit in the exchange 4-2 using an in-device control signal 356. In addition, the device control unit 63-2 transmits a reception confirmation 354 of the transferred data to the communication control device 62-2.
[0036]
In FIG. 5, the communication control device 62-2 is placed after the switch 61-2. However, if the communication control device 62-2 is in a position where the protocol control information processed by the device control device 63-2 can be searched, The position of 2 is not specified. In FIG. 5, the communication control device 62-2 generates the reception confirmation 353. However, any other format of data may be generated, and the data need not be generated. Good. The communication control device 62-2 returns the reception confirmation 353 to the external device 3-2. However, the communication control device 62-2 may return it to other devices as well as the external device 3-2. It does not have to be. FIG. 5 shows the case where the present invention is applied to the transmission data 355 from the external device 3-2. However, the transmission data 351 from the external device 3-2 is not necessarily required, and the communication control unit 62-2 is not necessarily used. As long as the data is transmitted to the device control unit 63-2, the data may be from anywhere, and the source of the data is not specified. In FIG. 5, a part of the transmission data 351 is processed by the device control unit 63-2 and becomes an in-device control signal 356 for controlling each part in the exchange 4-2, but it is not necessarily required to be a control signal. And various signals can be used.
[0037]
As shown in FIG. 5, when the present invention is applied to an exchange system, the processing order of specific data and other data is different from that of the conventional method, and as a result, the data is transmitted from the external device 3-2. The order of the reception confirmation 355 of the exchange 4-2 with respect to the transmission data 351 may change. For a specific data identifier, the time required for the reception confirmation 355 to be received after the external device 3-2 transmits the transmission data 351 may be shortened. In addition, since the present invention performs processing corresponding to a specific data identifier, when the number of specific data identifiers increases, processing corresponding to the specific data identifier increases. However, since the processing corresponding to a specific data identifier can be performed to reduce processing in the layer that should originally process the data identifier, the processing amount and load of the entire system do not increase.
[0038]
In the present invention, if a specific data identifier is used, processing corresponding to the specific data identifier is executed. Therefore, even if a field other than the data identifier of the protocol control information of the layer that originally processes the data identifier contains data that does not satisfy an undefined value or domain, if it is determined to be a specific data identifier Processing such as return may be performed. For example, in FIG. 5, when the transmission data 351 transmitted by the external device 3-2 has a specific data identifier, the exchange 4-2 returns a reception confirmation, and a protocol higher than the layer that originally processes the data identifier. If an incorrect value is found in the control information, it is assumed that the exchange 4-2 is a system that discards the data and does not return a reception confirmation. At this time, when receiving data having a specific data identifier and including an illegal value in the protocol control information of the layer or higher that processes the data identifier from the external device 3-2, the exchange 4-2 Detect identifier and send back acknowledgment.
[0039]
FIG. 6 shows a configuration diagram of a protocol processing apparatus according to the present invention. As an example, this protocol processing device is a hardware configuration example corresponding to the communication control unit 62-2 in the switching system shown in FIG.
[0040]
The communication control unit 5 includes a switch interface 50, a reception buffer 51a, a transmission buffer 51b, a data processing buffer 52, a layer (N) protocol processing unit 53, a device control unit interface 54, a corresponding processing determination table 55, a processor 56, and a bus 57. A data identifier storage buffer 58 is provided. The processor 56 includes an in-device control unit 561, a correspondence processing determination unit 562, and a data identifier correspondence processing unit 563. Further, the data identifier correspondence processing unit 563 includes a discard processing unit 563a and a return processing unit 563b. The in-device control unit 561 controls the entire communication control unit 5. The bus 57 is used for communication between the components.
[0041]
The operation in the communication control unit 5 will be described below. Data 380 received from the switch is stored in the reception buffer 51a via the switch interface 50. The data stored in the reception buffer 51a is stored in the data processing buffer 52 in order to determine the corresponding processing. Furthermore, the processor 56 causes the corresponding process determination unit 562 to perform a corresponding process determination on the data stored in the corresponding process data processing buffer 52. When the correspondence processing determination unit 562 determines that the data identifier is a specific data identifier, the data identifier correspondence processing unit 563 executes processing corresponding to the data identifier. For example, when it is determined that the disposal process is determined by the corresponding process determination unit 562, the discard process unit 563a executes the discard process. When the response processing determination 562 determines that the return processing is to be performed, the return processing unit 563b performs processing for returning the return data 381. When the response processing determination unit 562 determines that the target is not a specific processing target such as a discard processing target or a return processing target (normal data, etc.), the layer (N) protocol processing unit 53 performs layer (N) protocol processing, and the device Data 382 is transferred to the device controller via the controller interface 54. Note that the response processing determination table 55 is used for the response processing determination by the response processing determination unit 562. With such a hardware configuration of the protocol processing apparatus, the protocol processing method according to the present invention can be realized according to the detailed flowcharts shown in FIGS.
[0042]
FIG. 7 shows a detailed flowchart of the first embodiment for the protocol processing according to the present invention.
[0043]
In the layer (N) process, first, the data received from the layer (N-1) stored in the reception buffer 51a is stored in the data processing buffer 52 in the layer (N) (step 121). Next, the length of the data stored in the data processing buffer 52 is acquired (step 122). The received data may not be stored in the data processing buffer 52, and the subsequent processing may be performed by directly accessing the data in the receiving buffer 51a. Next, as described above, the data identifier is searched by appropriately using information on the position of the data identifier. For example, the sum of the length of the protocol control information of the layer (N) protocol and the length from the top of the layer (N + 1) protocol to the data identifier is read from the top of the data stored in the data processing buffer 52. The read data identifier is stored in the data identifier storage buffer 58 (step 123). The data identifier does not necessarily have to be stored in the data identifier storage buffer 58, and subsequent processing may be performed by accessing the data in the data processing buffer 52 or the reception buffer 51a.
[0044]
Next, it is determined whether or not the read data identifier is a specific data identifier. Here, FIG. 8 is an explanatory diagram of the correspondence processing determination table. The corresponding process determination table 70 includes a process target identifier table 700 and an identifier process table 701. Corresponding processing determination table 70 stores corresponding processing 7010 to 701n corresponding to specific data identifiers 7000 to 700n in processing target identifier table 700 in identifier processing table 701.
[0045]
From the start of the process determination loop (step 124a) to the end of the process determination loop (step 124b), i is processed in a loop from 1 to n. In this processing loop, the processing determination check (step 125) is performed using the processing target identifier table 700 included in the corresponding processing determination table 70. In the processing determination check (step 125), the data identifier stored in the data identifier storage buffer 58 is converted into specific data identifiers 7000, 7001, 7002,. ], P [1],..., P [n], and if there is the same value, it is determined as a specific data identifier, and processing corresponding to the specific data identifier is performed. When the comparison with all the elements in the processing target identifier table 700 is completed and there is no same value, the processing determination loop is terminated (step 124b), and (N) protocol processing is performed (step 126).
[0046]
The number of elements in the processing target identifier table 700 in FIG. 7 can be as many as the processing target data in the system. In the processing target identifier table 700, there is no element with the same value, or even if it exists, the second and subsequent elements are not determined. In FIG. 7, the comparison is performed using the processing target identifier table 700 having the data identifier value of the processing target data as an element, but the processing target identifier table 700 is not necessarily used. For example, selection / branching by comparison may be continuously performed without using a method of referring to the table in a loop. The processing corresponding to the specific data identifier in FIG. 7 is determined using the identifier processing table 701 corresponding to the processing target identifier table 700 in the corresponding processing determination table 70.
[0047]
If it is determined in the process determination check (step 125) that the data is specific process target data, a corresponding process check is performed (step 127). In the corresponding process check (step 127), the corresponding process is selected by referring to the element in the identifier-specific process table 701 corresponding to the element in the process target identifier table 700 determined to be a specific data identifier in the process determination check. For example, when p [2] 7002 that is an element of the processing target identifier table 700 determines that the data is specific processing target data, s [2] that is an element corresponding to p [2] 7002 in the processing table 701 by identifier Referring to 7012, the corresponding process indicated by s [2] is performed. In FIG. 7, the discard process and the return process are prepared as the values of the elements of the identifier-specific process table 702, but the combination of the discard process and the return process is not necessarily required, and a process defined by the system may be incorporated. Moreover, the number of corresponding processes may be one or more.
[0048]
Of the corresponding processes in FIG. 7, a process when it is determined as a discard process in the corresponding process check (step 127) is shown below. In the discarding process in FIG. 7, as an example, data including a specific data identifier is discarded and a reception confirmation message is returned. The same data identifier as the data identifier of the discarded data is assigned to the reception confirmation message returned at this time. Upon entering the discarding process, first, the read pointer of the reception buffer 51a is advanced by the length of the data including the specific data identifier (step 128), and the data received from the layer (N-1) has already been read. To do. Further, a fixed format of the reception confirmation message prepared in advance is written at the position of the current write pointer in the transmission buffer 51b (step 129). Further, the specific data identifier of the reception data to be processed is written in a predetermined location of the transmission data (step 130). Next, the length of the reception confirmation message for transmitting the write pointer of the transmission buffer 51b is advanced (step 131), the writing is completed, and the discarding process is completed.
[0049]
Of the corresponding processes in FIG. 7, a process when it is determined as a return process in the corresponding process check (step 127) is shown below. In the return process of FIG. 7, as an example, a process of returning data including a specific data identifier as it is is performed. When the return processing is started, first, the data stored in the data processing buffer 52 is copied to the transmission buffer 51b (step 132), and the received data is prepared for return as it is. Further, assume that the read pointer of the reception buffer 51a is advanced by the length of the data including the specific data identifier (step 133), and the data received from the layer (N-1) has already been read. Next, the length of the data including the specific data identifier for transmitting the write pointer of the transmission buffer 51b is advanced (step 134), the writing is completed, and the return processing is terminated.
[0050]
FIG. 9 shows a detailed flowchart of the second embodiment of the protocol processing method according to the present invention.
[0051]
This figure is a flowchart in the case of using the discard process table 800 and the return process table 810 instead of the corresponding process determination table 70 used in the detailed flowchart of the first embodiment of the present invention shown in FIG. Indicates. In FIG. 9, the process up to the process of acquiring the data identifier and storing it in the data identifier storage buffer (step 143) is the same as in FIG. The data identifier does not necessarily have to be stored in the data identifier storage buffer 58, and subsequent processing may be performed by accessing the data in the data processing buffer 52 or the reception buffer 51a. In FIG. 9, as an example, a discard determination loop (steps 144a to 144b) for performing a discard determination check (step 145) and a return determination check (step 147) are performed on the data identifier stored in the data identifier storage buffer 58. The return determination loop to be performed (steps 146a to 146b) is executed in order.
[0052]
Here, FIG. 10 is an explanatory diagram of the discard processing table and the return processing table. The discard processing table 800 stores specific data identifiers 8000 to 800n to be discarded. In the return processing table 810, specific data identifiers 8100 to 810n to be returned are stored.
[0053]
In the loop from the start of the discard judgment loop (step 144a) to the end of the discard judgment loop (step 144b), in the discard judgment check (step 145), the data identifier stored in the data identifier storage buffer is stored in each discard processing table 800. Compared with the elements 8000, 8001, 8002,..., 800n, if the value is the same, it is determined that the data identifier is the target of the discard process and the discard process is performed. Each processing method of the discard processing is the same as the method shown in FIG. If the comparison results are not the same value, a return determination loop is executed. In the loop from the return determination loop start (step 146a) to the return determination loop end (step 146b), in the return determination check (step 147), the data identifier stored in the data identifier storage buffer 58 is returned to the return processing table 810. .., 810n, if it is the same value, it is determined that the data identifier is the object of the return process, and the return process is performed. Each processing method of the return processing is the same as the method shown in FIG. If there is no same value in the return processing loop, normal (N) protocol processing is performed (step 148).
[0054]
FIG. 11 shows a detailed flowchart of the third embodiment of the protocol processing method according to the present invention.
[0055]
FIG. 11 is a detailed flowchart in which the discard determination loop and the return determination loop in the detailed flowchart of the second embodiment of the present invention shown in FIG. 9 are integrated into a process determination loop. In FIG. 11, the process up to the process of acquiring the data identifier and storing it in the data identifier storage buffer 58 (step 163) is the same as in FIG. 7 or FIG. The data identifier does not necessarily have to be stored in the data identifier storage buffer 58, and subsequent processing may be performed by accessing the data in the data processing buffer 52 or the reception buffer 51a. In FIG. 11, a processing determination loop (steps 164a to 164b) for performing both the discard determination check (step 165) and the return determination check (step 166) in order for the data identifier stored in the data identifier storage buffer 58 is shown. Execute.
[0056]
Here, FIG. 12 is an explanatory diagram of the discard processing table and the return processing table. In the discard processing table 900, specific data identifiers 9000 to 900n to be discarded are stored. The return processing table 910 stores specific data identifiers 9100 to 910n to be returned.
[0057]
In the loop from the start of the process determination loop (step 164a) to the end of the process determination loop (step 164b), the data identifier stored in the data identifier storage buffer is converted into each element 9000, 9001, 9002, .., 900n and each element 9100, 9101, 9102,..., 910n of the return processing table 910 are alternately compared. That is, data is compared such as d [0], r [0], d [1], r [1], d [2], r [2],. Here, if the value is the same as the element of the discard process table 900, it is determined that the data is the target of the discard process, and the discard process is performed. Each processing method of the discard processing is the same as the method shown in FIG. If the value is the same as the element of the return processing table 910, it is determined that the data is the target of the return processing, and the return processing is performed. Each processing method of the return processing is the same as the method shown in FIG. When there is no same value in the discard processing table and the return processing table and the processing determination loop is completed (step 164b), normal (N) protocol processing (step 167) is performed.
[0058]
7, 9, and 11, the discard process includes a process of returning the reception confirmation message, and the data received in the return process is returned as it is. However, such a process is not necessarily required. Depending on the contents of the data identifier and the configuration of the system to which the present invention is applied, the discard process may be a process that does not return the reception confirmation message but only discards. In the return process, for example, a process is performed in which data indicating that a specific process has been performed on the received data is returned, or the received data is returned after being filtered. May be executed. In FIG. 7, FIG. 9, and FIG. 11, the reception buffer 51a and the transmission buffer 51b are managed by the read pointer and the write pointer. However, this processing method is not necessarily required and can be changed as appropriate. it can. For example, the memory configuration is such that the next data cannot be written while the previous data remains, and memory control by the pointer is necessary when writing from the beginning of the memory. Instead, it is only necessary to specify the start address of the memory.
[0059]
In FIGS. 9 and 11, either the discard process determination or the return process determination may be performed first. In these examples, a discard process and a return process are prepared, but the combination of the discard process and the return process is not necessarily required, and a process defined by the system may be incorporated.
[0060]
Furthermore, when there are three or more specific data identifiers, the present invention can be applied by providing a plurality of process determination loops and a plurality of corresponding processes.
[0061]
【The invention's effect】
According to the present invention, as described above, extra protocol processing can be reduced and the amount of communication between layers can be reduced.
[0062]
In addition, according to the present invention, the upper layer protocol control information is discriminated by the lower layer, thereby reducing the traffic that may become a bottleneck of the processing amount and load, and improving the performance of the entire network. Can do.
[0063]
Furthermore, according to the present invention, the data transfer amount between the communication control unit 62-2 and the device control unit 63-2 as shown in FIG. 5 can be reduced, and the load on the device control unit 63-2 is reduced. Therefore, the throughput of the apparatus can be improved and the performance of the exchange 4-2 can be improved. Further, since the time for returning the reception confirmation 355 for the transmission data 351 transmitted by the external device 3-2 is short, it seems that the performance of the exchange 4-2 is improved as viewed from the external device 3-2.
[0064]
[Brief description of the drawings]
FIG. 1 is a flowchart about an outline of protocol processing according to the present invention.
FIG. 2 is a flowchart regarding application of protocol processing according to the present invention.
FIG. 3 is an explanatory diagram of data identifier search in the present invention.
FIG. 4 is an explanatory diagram of a communication form in an OSI 7 layer model to which the protocol processing according to the present invention is applied.
FIG. 5 is a schematic configuration diagram of an exchange system related to a protocol processing apparatus according to the present invention.
FIG. 6 is a configuration diagram of a protocol processing apparatus according to the present invention.
FIG. 7 is a detailed flowchart of the first embodiment regarding protocol processing according to the present invention;
FIG. 8 is an explanatory diagram of a handling process determination table in FIG. 8;
FIG. 9 is a detailed flowchart of a second embodiment of protocol processing according to the present invention.
FIG. 10 is an explanatory diagram of a discard processing table and a return processing table.
FIG. 11 is a detailed flowchart of protocol processing according to the third embodiment of the present invention.
FIG. 12 is an explanatory diagram of a discard processing table and a return processing table.
FIG. 13 is a schematic diagram of a layer configuration and a protocol according to an OSI reference model.
FIG. 14 is an explanatory diagram of an OSI 7 layer model.
FIG. 15 is an explanatory diagram of a service data unit and a protocol data unit.
FIG. 16 is an explanatory diagram of a communication form in the OSI 7 layer model.
FIG. 17 is a configuration diagram of a conventional exchange system.
[Explanation of symbols]
1-3,1-4,1-6,1-7,1-8,1-9 Termination system
2-1,2-2,2-3 exchange system
3-1,3-2 External device
4-1,4-2 switch
5 Communication control unit
50 Switch interface
51a Receive buffer
51b Transmit buffer
52 Data processing buffer
53 Layer (N) protocol processor
54 Device controller interface
55 Supported processing judgment table
56 processors
57 Bus
58 Data identifier storage buffer
561 In-device controller
562 Corresponding processing judgment part
563 Data identifier correspondence processing part
563a Waste disposal department
563b Return processing section
62-1,62-2 Communication control unit
63-1,63-2 Device controller

Claims (15)

A protocol processing method (N is an integer) in a layer (N) of a plurality of layers,
A search step of searching for a data identifier for a layer greater than or equal to layer (N + 1);
A determination step of determining whether the data identifier searched by the search step is a specific data identifier;
If it is determined that the data identifier searched in the determination step is a specific data identifier, a corresponding processing step for performing processing corresponding to the specific data identifier;
On the other hand, a protocol processing method comprising a protocol processing step of executing a layer (N) protocol process when it is determined that the data identifier searched in the determination step is not a specific data identifier. The search step includes
Storing data received from the layer (N-1) in a data processing buffer of the layer (N);
A step of acquiring, from data stored in a data processing buffer, a data identifier for a layer (N + 1) or higher in a (N) protocol service data unit based on information on the position. Item 4. The protocol processing method according to Item 1. The determination step includes
With reference to the correspondence process determination table in which the specific data identifier element and the corresponding process element corresponding to the specific data identifier element are stored,
The acquired data identifier is compared with a specific data identifier element of the corresponding processing determination table, and if it is the same value, it is determined as a specific data identifier,
The corresponding processing step includes
3. The protocol processing method according to claim 1, wherein the corresponding processing is performed according to a corresponding processing element corresponding to a specific data identifier element. The determination step includes
With reference to the first correspondence processing table storing the first specific data identifier element to be subjected to the first correspondence processing,
The acquired data identifier is compared with the first specific data identifier element of the first correspondence processing table, and if it is the same value, it is determined that it is the first specific data identifier,
The corresponding processing step includes
Performing a first handling process according to a first specific data identifier;
Next,
The determination step includes
With reference to the second correspondence processing table in which the second specific data identifier element to be subjected to the second correspondence processing is stored,
The acquired data identifier is compared with the second specific data identifier element of the second correspondence processing table, and if it is the same value, it is determined that it is the second specific data identifier,
The corresponding processing step includes
3. The protocol processing method according to claim 1, wherein the second corresponding process is executed in accordance with the second specific data identifier. The determination step includes
With reference to the first correspondence processing table storing the first specific data identifier element to be subjected to the first correspondence processing,
The acquired data identifier is compared with the first specific data identifier element of the first correspondence processing table, and if it is the same value, it is determined that it is the first specific data identifier,
With reference to the second correspondence processing table in which the second specific data identifier element to be subjected to the second correspondence processing is stored,
The acquired data identifier is compared with the second specific data identifier element of the second correspondence processing table, and if it is the same value, it is determined that it is the second specific data identifier,
The corresponding processing step includes
3. The protocol processing method according to claim 1, wherein the first or second correspondence processing corresponding to the first or second specific data identifier determined in the determination step is executed. The process corresponding to the specific data identifier is a process of discarding the received data,
6. The method according to claim 1, wherein when the determination step determines that the processing is a discarding process, the handling processing step discards the data including the specific data identifier and returns a reception confirmation message. The protocol processing method as described. The process corresponding to the specific data identifier is a process of returning or transferring the protocol data,
2. The process according to claim 1, wherein when the determination step determines that the process is a return process or a transfer process, the corresponding process step performs a process of returning or transferring data including a specific data identifier or other data. 7. The protocol processing method according to any one of items 1 to 6. 8. The protocol processing method according to claim 7, wherein a flag or an identifier indicating unprocessed or error is added to the protocol control information when performing the process of returning data. 9. The protocol processing method according to claim 1, wherein whether or not to perform processing corresponding to a specific data identifier is changed according to a state of a system or a protocol processing function. The data identifier is
Error identifier, protocol identifier, upper protocol identifier, protocol version identifier, data class identifier, identifier indicating physical line or logical line such as data link identifier, or protocol processing contents, function, data type, command type, response type 10. An identifier indicating error type, data priority, data length, destination address, transmission source address, maximum data length, presence / absence of data division, lifetime or error detection code, and the like. The protocol processing method according to any one of the above. A protocol processing device (N is an integer) in a layer (N) in a plurality of layers,
A data processing buffer for storing received data received from a lower-level device;
A transmission buffer for transmitting transmission data to a lower-level device;
An interface connected to the host device;
A corresponding processing determination unit that searches the received data stored in the data processing buffer for a data identifier for a layer of layer (N + 1) or higher and determines whether the searched data identifier is a specific data identifier;
If it is determined that the data identifier searched by the corresponding processing determination unit is a specific data identifier, a corresponding processing unit that performs processing corresponding to the specific data identifier;
If the data identifier retrieved by the corresponding process determination unit is determined not to be a specific data identifier, a protocol process for executing layer (N) protocol processing and transferring data to the host device via the interface Protocol processing device comprising a unit. The correspondence processing unit
A disposal processing unit that executes the disposal processing when the corresponding processing determination unit determines that the disposal processing;
The protocol processing apparatus according to claim 11, further comprising: a return processing unit that performs a process of returning data or a process of transferring data when the response process determining unit determines that the process is a return process or a transfer process. . 13. The protocol processing device according to claim 11, further comprising a correspondence processing determination table in which correspondence processing elements are stored in correspondence with specific data identifiers. The protocol processing apparatus according to claim 11, further comprising a correspondence processing table storing a specific data identifier for which the correspondence processing is performed for each correspondence processing. The protocol processing apparatus according to claim 11, further comprising a data identifier storage buffer that stores the retrieved data identifier and is referred to by the corresponding process determination unit.

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