JPH05191474A - Communication protocol processor - Google Patents

Abstract

PURPOSE:To optionally designate the combination of processing parts that should be started when the data are transmitted and received by securing the correspondence between a single protocol stack identifier and the entry points set to plural, layer processing parts on a table to which a directory service part refers. CONSTITUTION:A directory service part sends an entry point to layer a layer-7 processing part from an entry point train 102 of a 7th processing part based on a 1st row of 8 reference table against a stack identifier 1. Then a user interface part sends a transmission request to the layer-7 processing part via a communication line. The layer-7 processing part applies the protocol processing of the layer 7 to the transmission data and has an access to the directory service part. In the same way, an entry point is obtained to a layer-6 processing part which is processed next via the same stack identifier. Then a transmission request is sent to the layer-6 processing part via the communication line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication protocol processing device for performing communication protocol processing in a node or terminal of a communication system.

[0002]

2. Description of the Related Art A node of a communication system using a hierarchical communication protocol such as a protocol based on the OSI reference model of ISO (International Organization for Standardization), such as a terminal or a network device connected to a local area network, has a high speed. In consideration of the ease of implementation and maintenance, the processing unit corresponding to each layer is provided.
In the conventional technology, as a means for controlling these layer-by-layer processing units in response to processing such as data transmission and reception, the highest layer is used for transmission and the lowest layer is used for reception in order according to the hierarchical relationship between layers. A directory service unit is provided to specify the processing unit of the layer that starts and terminates the processing. However, the conventional technique has a problem in that the complicated control of each layer processing unit required in various communication systems cannot be sufficiently realized.

FIG. 7 is a block diagram showing the configuration of a conventional communication protocol processing device found in, for example, Japanese Patent Laid-Open No. 64-47154, "Communication Protocol Control Device". In FIG. Is a user interface unit, 5 is a directory service unit, 20 is a layer 7 processing unit, 30 is a layer 6 processing unit, 40 is a layer 5 processing unit, 50 is a layer 4 processing unit, 60 is a layer 3 processing unit,
Reference numeral 70 is a layer 2 processing unit, 80 is a transmission / reception control unit that performs layer 1 processing and accesses to the following transmission path interface unit,
90 is a transmission line interface unit, 95 is a transmission line, 400
Is the directory service unit 5 and the layer processing unit 20-
A communication line between the transmission / reception control unit 80 and a communication line 500 between the user interface unit / transmission / reception control unit 80 and the layer 7 processing unit 20 to the layer 2 processing unit 70.
Further, FIG. 8 is a diagram showing a configuration example of a table referred to by the directory service unit 5, and in FIG.
Is a name for identifying a protocol stack (a combination of protocols for each layer determined for each communication system) designated by the user, 802 is an identifier corresponding to the name 801, and 803 is an entry point of each layer identified by the identifier 802.

Next, the operation of the apparatus shown in FIG. 7 will be described. When the user specifies, for example, name4 (704) as the name representing the protocol stack and transmits the data, the user interface unit 4 that has received the transmission request accesses the directory service unit 5 to name4.
An identifier id5 corresponding to (704) is obtained, and further id5
The entry point of the layer 5 processing unit 40 corresponding to is acquired. Then, the user interface unit 4 sends a transmission request to the layer 5 processing unit 40 via the communication line 500 based on the entry point to continue the processing. After that, each processing unit from the layer 5 processing unit 40 to the transmission / reception control unit 80 is sequentially activated to process the data for transmission, and the data is transmitted to the transmission path 95 via the transmission path interface unit 90. On the other hand, when data is received from the transmission path 95 via the transmission path interface section 90, the transmission / reception control section 80
The directory service unit 5 is accessed via the communication line 400 and an identifier in the data, for example, name4 (70)
4), the entry point value of each layer processing unit is checked, and thereafter, the processing unit of the layer matching the entry point toward the upper layer (in this case, the layer 5 processing unit 4
After performing data reception processing for each layer up to 0), the received data is delivered to the user via the communication line 500 and the user interface unit 4.

[0005]

Since the device according to the prior art operates as described above, it has the following problems. The first problem is that the table referred to by the directory service unit 5 has only one entry point for each name that identifies a stack as shown in FIG.
A normal protocol stack consisting of all layers of a hierarchical protocol and a protocol stack that omits the upper layer for emergency data transfer can be processed, but a protocol stack that omits the middle layer cannot be processed. There is a point. A protocol stack that omits the middle layer is, for example, a mini MAP (Manufacturing Automa) in the field of factory automation.
standardization protocol stack that omits layers 6 to 3 is standardized.

A second problem is that in the communication protocol control unit 3 of FIG. 7, each layer processing unit 20 to 70 supports only one protocol, and the directory service unit table of FIG. Since only the configuration is taken into consideration, for example, a local area network (L
There is a problem in that there is a plurality of protocol stacks that use different protocols in the same layer, such as the case where a plurality of connection-type and connectionless-type protocol stacks are supported on AN). LAN
As a specific example of supporting a plurality of protocol stacks above, in the ISO standard 8880 “Protocol combination for providing / supporting OSI network service”, LLC type 2 is set in the LLC sublayer of layer 2.
There are two cases where a combination using ISO standard 8208 for Layer 3 and a combination using LLC type 1 for LLC sublayer of Layer 2 and ISO standard 8473 for Layer 3 are defined. In this case, in layer 4,
The former uses Class 0 or Class 2 of ISO standard 8073 "Transport Protocol", while the latter uses the same I
It is defined to use SO standard class 4. As another conventional technique, for example, Japanese Patent Laid-Open No. 3-178245 "Protocol processing method" discloses a method of inputting a plurality of different protocol specifications to the same device to obtain a device for different protocol processing. This technology cannot support different protocol stacks simultaneously. In this case, it may be difficult to apply it to an actual system and it may be difficult to support it. Therefore, a technology capable of simultaneously supporting multiple protocol stacks is desired.
Still another conventional technique is, for example, Japanese Patent Laid-Open No. 3-856.
Japanese Patent Laid-Open No. 53-53 discloses a technique for simultaneously supporting a plurality of protocol stacks.
(1) Since a unified interface is provided between the layer 5 and the layer 6, it cannot be applied to any combination of protocol stacks that does not assume such an interface. (2) There is a drawback that means for identifying a plurality of protocol stacks is not explicitly described and is technically insufficient.

As a third problem, in the communication protocol control unit 3 of FIG. 7, there is only one layer processing unit 20 to 70, and the directory service unit table of FIG. 8 considers only the configuration of FIG. Therefore, there is a point that it is not possible to use a plurality of processing units for processing one layer. In this case, in order to improve the performance of the entire communication protocol processing device, a plurality of layer processing units are provided to perform parallel processing, or only a plurality of layer processing units, which have a heavy load and are a bottleneck for performance improvement, are provided and the overall performance is improved. Even if you try to improve As another conventional technique, for example, in Japanese Unexamined Patent Publication No. 2-271453, "Communication Protocol Control System", a layer processing unit for all layers is provided in each of the host and the communication control board, and the processing is distributed between them according to the load. Discloses a technique of dynamically using a plurality of layer processing units, but (1) there are only two protocol processing units for each layer, one on the host side and one on the communication control board side, and there are other numbers. I can't get it
(2) There is a drawback that a plurality of protocol processing units cannot be provided only in a specific layer, and a flexible configuration is impossible.

[0008]

According to another aspect of the present invention, there is provided a communication protocol processing device, wherein a directory service unit for associating a protocol stack identifier with a layer processing unit,
On the table referenced by the directory service unit,
One protocol stack identifier is made to correspond to entry points to a plurality of layer processing units.

According to a second aspect of the present invention, there is provided a communication protocol processing device, wherein a plurality of layer processing units corresponding to a plurality of protocols in the same layer are provided, and the directory service unit uses the same layer on a table referred to by the directory service unit. Even inside, a plurality of layer processing units that process different protocols can be identified.

According to another aspect of the communication protocol processing apparatus of the present invention, a plurality of layer processing units for processing the same protocol are provided, and the directory service unit has the same layer in the same layer on the table referred to by the directory service unit. A plurality of layer processing units that process a protocol can be identified.

[0011]

In the communication protocol processing device according to the first aspect of the present invention, the directory service unit can associate any combination of layer processing units with the protocol stack. Therefore, the communication protocol processing device is only the protocol stack without the upper layer. It is also possible to support a protocol stack in which the middle layer is omitted, and the first problem is solved.

In the communication protocol processing device according to the second aspect, it is possible to associate a plurality of layer processing units respectively corresponding to a plurality of protocols in the same layer with which layer processing unit should be used for each protocol stack identifier. Since the communication protocol processing device has the directory service unit, it can simultaneously support a plurality of protocol stacks having different protocols used in the same layer, and the second problem is solved.

A communication protocol processing device according to a third aspect of the present invention includes a plurality of layer processing units that process the same protocol.
Since there is a directory service unit that can specify the layer processing unit to be used from among the plurality of layer processing units for each data processing occasion, the communication protocol processing device performs processing based on the load of the layer processing unit. The data to be processed can be appropriately associated with the layer processing unit to improve its performance, and the third problem can be solved.

[0014]

EXAMPLES Example 1. First, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a table referred to by a directory service unit according to the first embodiment of the present invention. In the figure, 101 is a stack classifier indicating the type of protocol stack, and 102 is the first data at the time of transmission from a user. Of the entry points of the processing unit that should process the above, 103 is the first processing unit entry point sequence 10
2 is a sequence of entry points of a processing unit that should process data secondly, 104 is a sequence of entry points to a processing unit that should process data third, following the second processing unit entry point sequence 103 Similarly, a column is defined, and 108 is a column of entry points to the processing section that should process the seventh data. Since the OSI reference model defines the hierarchical structure of the protocol consisting of seven layers, the table shown in FIG. 1 (and similar tables shown in FIG.
The structure is such that entry points to up to seven layer processing units can be expressed. However, it should be apparent that increasing or decreasing the number of columns in FIG. 1 and other similar figures can be applied to a hierarchical structure of a protocol with any number of layers.

Here, as an example of the protocol stack supported by the first embodiment, a protocol stack having a stack identifier 1 and a protocol stack having a stack identifier 2 are assumed. Stack identifier 1 is OS
It is assumed that a protocol stack having all seven layers of the I reference model is represented, and a stack identifier 2 represents a protocol stack having only layer 7, layer 2, and layer 1 like mini MAP. At this time, in the table referred to by the directory service unit 5, as shown in the first row of FIG.
The entry points to the layer 7 processing unit 20 to the transmission / reception control unit 80 are written in 108 to 108, respectively. Further, as shown in the second line of FIG. 1, for the stack identifier 2, the entry points to the layer 7 processing unit 20, the layer 2 processing unit 70, and the transmission / reception control unit 80 are assigned to the entry point sequences 102, 103, and 104, respectively. Write it down. The second
The column that did not write an entry point in the row writes a specific value that represents a space.

Next, a method of selecting the layer processing unit of the directory service unit 5 in FIG. 1 will be described. The configuration of the communication protocol processing device in this embodiment is the same as that of the conventional technique shown in FIG. When the user transmits the data of the stack identifier 1, the user interface unit 4 that has received the transmission request accesses the directory service unit 5 and sets the entry point to the processing unit to which the next process corresponding to the stack identifier should be passed. To earn. Here, the directory service unit 5 refers to the first row of the reference table of FIG. 1 for the stack identifier 1, and passes the entry point to the layer 7 processing unit 20 from the entry point column 102 of the seventh processing unit. Then, the user interface unit 4 sends a transmission request to the layer 7 processing unit 20 via the communication line 500. In the layer 7 processing unit 20, after the layer 7 protocol processing is performed on the transmission data, the directory service unit 5 is accessed and the layer 6 processing unit 30 is processed in the same way from the same stack identifier to the layer 6 processing unit 30. An entry point is obtained and a transmission request is sent to the layer 6 processing unit 30 via the communication line 500. Hereinafter, the transmission data is similarly processed by each layer processing unit, and then transmitted to the transmission / reception control unit 80, subjected to the layer 1 protocol processing, and then transmitted to the transmission path 95 via the transmission path interface unit 90. .. Here, when the directory service unit 5 refers to the reference table of FIG. 1, since it is a transmission request from the user, the entry points are sequentially obtained from the upper layer side at the left end.

Next, when the user transmits the data of the stack identifier 2, the user interface unit 4 which has received the transmission request accesses the directory service unit 5 and the process to be passed next corresponding to the stack identifier. Earn entry points to the club. Here, the directory service unit 5 refers to the second line of the reference table of FIG. 1 for the stack identifier 2, and passes the entry point to the layer 7 processing unit 20 from the entry point column 102 of the seventh processing unit. Then, the user interface unit 4 uses the communication line 5
A transmission request is sent to the layer 7 processing unit 20 via 00. In the layer 7 processing unit 20, after the transmission data is subjected to the layer 7 protocol processing, the directory service unit 5 is accessed, and the layer 2 processing unit 70 is similarly processed as the processing unit to be passed next from the same stack identifier. The entry point is obtained, and the layer 2 processing unit 70 is received via the communication line 500.
Send a send request to. In the layer 2 processing unit 70, after the transmission data is subjected to the layer 2 protocol processing, the directory service unit 5 is accessed, and similarly, an entry to the transmission / reception control unit 80 as a processing unit to which the same stack identifier should be passed next. The points are obtained and a transmission request is sent to the transmission / reception control unit 80 via the communication line 500. Transmission / reception control unit 80
Then, after the transmission data is subjected to the layer 1 protocol processing, it is sent to the transmission line 95 via the transmission line interface unit 90.

On the other hand, when receiving data from another communication protocol processing device, the transmission / reception control unit 80 which has received the data from the transmission line 95 via the transmission line interface 90,
Determine the protocol stack based on the information in the data,
The directory service unit 5 is accessed to obtain the entry point to the processing unit to which the processing should be passed next. Here, the protocol stack of the received data is, for example, the stack identifier 2
, The directory service unit 5 refers to the stack identifier 2 in the second row of the reference table in FIG.
The entry point sequence 108 to the seventh processing unit to the entry point sequence to the fourth processing unit is blank, and the entry point sequence 104 to the third processing unit stores the entry points to the transmission / reception control unit 80 of the access source. Therefore, these are ignored and the entry point to the layer 2 processing unit 70 is passed from the next entry point sequence 103 to the second processing unit. Then, the transmission / reception control unit 80 uses the communication line 500.
A reception request is sent to the layer 2 processing unit 70 via. In the layer 2 processing unit 70, after the layer 2 processing unit 20 performs the layer 2 protocol processing on the received data, the directory service unit 5 is accessed and the processing is transferred to the layer 7 processing unit 20 as a processing unit to which the same stack identifier should be passed next. An entry point is obtained and a reception request is sent to the layer 7 processing unit 20 via the communication line 500. In the layer 7 processing section 20, the received data is subjected to the layer 7 protocol processing, and then the received data is passed to the user via the user interface section 4. Here, when the directory service unit 5 refers to the reference table of FIG. 1, since it is the received data from the transmission path 95, the entry points are sequentially obtained from the lower layer side at the right end.

FIG. 2 is a diagram showing another configuration of the table referred to by the directory service unit in the first embodiment.
In the figure, 101 is a stack identifier indicating the type of protocol stack, 112 is a layer 7 when a user transmits.
, A column for storing a flag indicating whether to process data, 113 is a column for storing a flag indicating whether to process data in layer 6, and 114 is a sequence for processing data in layer 5 A column for storing a flag indicating whether or not, and a column 118 for storing a flag indicating whether or not to process data in the layer 1 are also stored. If the flag in the above is 1 in the figure, data processing is necessary, 0
If so, data processing is unnecessary. Although not shown in the figure, it is assumed that the directory service unit 5 has a table storing entry points to each layer processing unit, in addition to the reference table of FIG. Further, for the same protocol stack and stack identifier as the embodiment of FIG. 1 described above, in the table of FIG. 2, 1 is written in the flag columns 112 to 118 for the stack identifier 1 as shown in the first row, As shown in the second row, with respect to the stack identifier 2, 1 is written in the flag columns 112, 118, and the column corresponding to the layer 2, and 0 is written in the other columns such as the flag column 113.

Next, a method of selecting the layer processing unit of the directory service unit 5 in FIG. 2 will be described. When the user transmits the data of the stack identifier 2, the user interface unit 4 that has received the transmission request accesses the directory service unit 5 and makes an entry from the line corresponding to the stack identifier to the processing unit to which the process should be passed next. Earn points. Here, the directory service unit 5 refers to the second line of the reference table of FIG. 2 for the stack identifier 2, and the flag 112 indicating the necessity of data processing in the layer 7 is 1 (necessary). The entry point to the layer 7 processing unit is obtained and passed to the user interface unit 4. Then, the user interface unit 4 uses the communication line 50.
A transmission request is sent to the layer 7 processing unit 20 via 0. In the layer 7 processing unit 20, after the transmission data is subjected to the layer 7 protocol processing, the directory service unit 5 is accessed and the entry point to the processing unit to which the processing is to be passed next is similarly obtained from the same stack identifier. Here, the directory service unit 5 searches the stack identifier 2 for the second row of the reference table of FIG. 2 from the flag 113 indicating the necessity of data processing in the layer 6, and the flags in the layers 6 to 3 are 0. Since the flag in layer 2 is 1 (required) in the case of (no), the layer 2 is
The entry point to the processing unit 70 is obtained and passed to the layer 7 processing unit 20. Then, the layer 7 processing unit 20 uses the communication line 5
A transmission request is sent to the layer 2 processing unit 70 via 00. Subsequent operations are the same as those already described, and will be omitted.

On the other hand, when receiving data from another communication protocol processing device, the transmission / reception control unit 80 which has received the data from the transmission line 95 via the transmission line interface 90,
Determine the protocol stack based on the information in the data,
The directory service unit 5 is accessed to obtain the entry point to the processing unit to which the processing should be passed next. Here, the protocol stack of the received data is, for example, the stack identifier 2
2 is referred to, the directory service unit 5 refers to the second row of the reference table of FIG.
Since the flag indicating the necessity of data processing in the layer 2 is 1, the entry point to the layer 2 processing unit 70 is obtained from another table and passed to the transmission / reception control unit 80. Then, the transmission / reception control unit 80 sends a reception request to the layer 2 processing unit 70 via the communication line 500. In the layer 2 processing unit 70, after the received data is subjected to the layer 2 protocol processing, the directory service unit 5 is accessed and the entry point to the processing unit to which the processing is to be passed next is similarly obtained from the same stack identifier. Here, the directory service unit 5
Similarly, referring to the second row of the reference table in FIG.
Since the flag indicating the necessity of data processing in layers to 6 is 0 and the flag in layer 7 is 1, the entry point to the layer 7 processing unit 30 is obtained from another table and passed to the layer 2 processing unit 70. Then, the layer 2 processing section 70 sends a reception request to the layer 7 processing section 20 via the communication line 500. Subsequent operations are the same as those already described, and will be omitted.

Example 2. In the description of FIGS. 1 and 2 above, the user interface unit 4 and each layer processing unit 2 are described.
0 to 70. The transmission / reception control unit 80 accesses the directory service unit 5 each time data is transmitted / received, and obtains the entry point of the processing unit to which data is to be passed next. However, at the time of transmission, the user interface unit 4,
At the time of reception, only the transmission / reception control unit 80 accesses the directory service unit 5 and subsequently acquires a series of entry points to which data should be passed. In the subsequent data passing between the layer processing units, these entry point values are sent together with the data. It is also possible to hand over. In this method, since the directory service unit 5 is accessed only once when transmitting or receiving one piece of data, the processing load of the directory service unit 5 is reduced and each layer processing unit requires access to the directory service unit 5. Time is reduced and performance is improved.

Example 3. In addition, in the tables shown in FIGS. 1 and 2, the same row is referred to from different directions when transmitting and receiving data for the same stack identifier. It is also possible to configure a table in which entry lines to the layer processing units are arranged in the reverse order of the row to be referred to at the time of reception, and the row to be referred to at the time of reception, separately from the row to be referred to at the time of. According to this configuration, the capacity of the table is increased, but the reference directions of the entry points are unified, so that the directory service unit 5 can be controlled easily.

Example 4. Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the communication protocol control unit of the communication protocol processing device of the fourth embodiment. In FIG. 3, 3 is a communication protocol control unit, 4 is a user interface unit, 5 is a directory service unit,
20 is a layer 7 processing unit, 30 is a layer 6 processing unit, 40 is a layer 5 processing unit, 51 is a layer 4 processing unit, 52 is a layer 4 processing unit, 61 is a layer 3 processing unit, 62 is a layer 3 processing unit, 71 Is a layer 2 processing unit, and 72 is a layer 2
A processing unit, 80 is a transmission / reception control unit that performs layer 1 processing and accesses to the following transmission line interface unit, 90 is a transmission line interface unit, 95 is a transmission line, 400 is the directory service unit 5 and the layer 7 processing unit 20 to transmission / reception. A communication line with the control unit 80, 500 is the user interface unit, the transmission / reception control unit 80, and the layer 7 processing unit 20 to.
It is a communication line between the layer 2 processing section 71 and the layer 2 processing section 72.

FIG. 4 is a diagram showing a configuration example of a table referred to by the directory service unit 5 in the communication protocol control unit 3 having the configuration shown in FIG. 3. In FIG. 4, 101 is a stack identifier indicating the type of protocol stack, and 12 is a stack identifier.
2 is a column of entry points of a processing unit that should process data first when transmitted from a user; 126 is a column of entry points of a processing unit that should process data fifth;
7 is a column of entry points to the processing unit which should process data 6th following the fifth processing unit entry point sequence 126, and 128 is 7th processing following the sixth processing unit entry point sequence 127 It is a sequence of entry points to the processing unit to be processed. The difference between the table shown in FIG. 4 and the table shown in FIG. 1 is that, in the table of FIG. 1, only one layer processing unit from one layer can be registered in each of the columns 102 to 108. In the table of FIG. 4, a plurality of different layer processing units can be identified and registered in one layer in each of the columns 122 to 128.

Here, as an example of the protocol stack simultaneously supported by the fourth embodiment, the stack identifier 3
Consider a protocol stack with and a protocol stack with stack identifier 4. Both stack identifier 3 and stack identifier 4 represent a protocol stack having all seven layers of the OSI reference model, but layer 2, layer 3, and layer 4 are different. An example of the stack identifier 3 and the stack identifier 4 is, for example, the protocol stack mentioned in the second problem. Figure 3 at this time
In the communication protocol control unit 3 shown in FIG.
The layer 2 is processed by the layer 4 processing unit 51, the layer 3 processing unit 61, and the layer 2 processing unit 71, respectively, and the layer 4, the layer 3, and the layer 2 of the protocol stack having the stack identifier 4 are the layer 4 processing unit 52 and the layer, respectively. The 3 processing unit 62 and the layer 2 processing unit 72 are supposed to process. Further, in the table referred to by the directory service unit 5, entry points 122 to 128 for the stack identifier 3 and the stack identifier 4 as shown in FIG.
The entry points to the layer 7 processing unit 20 to the transmission / reception control unit 80 are written in the respective fields. Here, as shown by the entry points 126 and 127, with respect to the layers whose protocols are different between the stack identifier 3 and the stack identifier 4, the layer 4 processing unit 51, the layer 3 processing unit 61, and the layer 2 processing unit 71 are associated with the stack identifier 3. To the layer 4 processing unit 52, the layer 3 processing unit 62, and the layer 2 processing unit 72 in association with the stack identifier 4.

Next, a method of selecting the layer processing unit of the directory service unit 5 in the fourth embodiment will be described.

When the user transmits the data of the stack identifier 3, the user interface unit 4 which has received the transmission request accesses the directory service unit 5 and sends it to the processing unit to which the next process corresponding to the stack identifier should be passed. Earn entry points. Here, the directory service unit 5 refers to the first row of the reference table of FIG. 1 for the stack identifier 3 and refers to the entry point sequence 10 of the seventh processing unit.
The entry point to the layer 7 processing unit 20 is passed from 2. Then, the user interface unit 4 uses the communication line 500.
A transmission request is sent to the layer 7 processing unit 20 via. Hereinafter, the transmission of the transmission data from the layer 7 processing unit 20 to the transmission / reception control unit 80 is performed in the same manner as in the first invention. However, regarding the layer 4, layer 3, and layer 2, the directory service unit 5 returns an entry point for the stack identifier 3 so that the transmission data is processed through the processing unit column on the left side in FIG. , The entry point is returned so that the transmission data is processed through the processing unit row on the right side in FIG. This corresponds to the stack identifier 3 to the layer 4 processing unit 51 / layer 3
The entry points to the processing unit 61, the layer 2 processing unit 71, and the stack identifier 4 are the layer 4 processing unit 52, the layer 3 processing unit 62, and the layer 2 processing unit 72.
This is because the entry point to is registered in the table of FIG. The operation of each layer processing unit is similar to that of the first embodiment.

When data is received from another communication protocol processing device, the directory service unit 5 receives the received data with respect to the stack identifier 3 from the processing unit array on the left side in FIG. The entry point is returned so that the received data is processed through the processing unit column on the right side in FIG. Other parts are processed in the same manner as in the above embodiment.

Example 5. Finally, a fifth embodiment of the present invention will be described with reference to the drawings. Since the load is concentrated on the layer 4 in the fifth embodiment, a communication protocol processing device provided with two layer 4 processing units is used. FIG. 5 is a block diagram showing a configuration of a communication protocol control unit of such a communication protocol processing device, in which 3 is a communication protocol control unit,
4 is a user interface unit, 5 is a directory service unit, 20 is a layer 7 processing unit, 30 is a layer 6 processing unit,
40 is a layer 5 processing unit, 55 is a layer 4 processing unit that is one of the layer 4 processing units, 56 is a layer 4 processing unit that is the other of the layer 4 processing units, 60 is a layer 3 processing unit, and 70 is a layer 2 processing unit Reference numeral 80 is a transmission / reception control unit for performing layer 1 processing and access to the transmission line interface unit described below, 90 is a transmission line interface unit, 95 is a transmission line, 400 is the directory service unit 5 and the layer 7 processing unit 20 to transmission / reception control unit A communication line between the user interface unit 80 and the transmission / reception control unit 80 and the layer 7 processing unit 20 to the layer 2 processing unit 70.

FIG. 6 is a diagram showing a configuration example of a table referred to by the directory service unit 5 in the communication protocol control unit 3 having the configuration shown in FIG. 5. In the figure, 101 is a stack identifier indicating the type of protocol stack, and 13 is a stack identifier.
Reference numeral 2 denotes a column of entry points of a processing unit that should process the first data at the time of transmission from the user, 136 denotes a column of pointers that indicates an entry point of the processing unit that should process the fifth data at the time of transmission from the user, 137. Is a sequence of pointers to the fifth processing unit entry point 136, and is a sequence of entry points to the processing unit that should process data sixth, and 138 is a seventh sequence of data following the sixth processing unit entry point sequence 137. Is a column of entry points to the processing unit that should process the, 150 is an entry point registration table that registers entry points to a plurality of layer processing units that process the same protocol, and 151 is registered in the entry point registration table 150. Layer 4 processing unit 5
5, entry point 152 is an entry point to the layer 4 processing section 56 registered in the entry point registration table 150, 171 is a pointer 136 to the fifth processing section entry point for the stack identifier 1, and layer 136 is a layer 4 processing Entry point 1 to part 55
Reference numeral 51 denotes an arrow indicating this, and reference numeral 172 denotes an arrow indicating that the pointer 136 to the fifth processing unit entry point for the stack identifier 1 points to the entry point 152 to the layer 4 processing unit 56.

The difference between the table shown in FIG. 6 and the table shown in FIG. 1 is as follows. In the table of FIG. 1, the entry points of the layer processing units are registered one by one from one layer in each of the columns 102 to 108, and the entry points are directly read. Meanwhile, FIG.
In the table, for a layer having a plurality of layer processing units that process the same protocol like Layer 4, a pointer to an entry point registration table 150 in which the entry points of the layer processing units are arranged is registered as a pointer column 136. , The entry point is read indirectly. As an example of a protocol stack that is simultaneously supported by this Embodiment 5, assume a stack identifier 5 representing a protocol stack having all seven layers of the OSI reference model. At this time, in the table referred to by the directory service unit 5, the entry point 151 to the layer 4 processing unit 55 and the entry point 152 to the layer 4 processing unit 56 are registered in the entry point registration table as shown in FIG. deep. In addition, the pointer 136 to the entry point to the fifth processing unit in the first line points to the layer 4 processing unit 55 as indicated by arrow 171 according to the load on the layer 4 processing unit 55 and the layer 4 processing unit 56. It is assumed that either the entry point 151 is designated or the entry point 152 to the layer 4 processing unit 56 is designated as indicated by an arrow 172.

Next, a method of selecting the layer processing unit of the directory service unit 5 in the fifth embodiment will be described. When the user transmits the data of the stack identifier 5, the user interface unit 4 that has received the transmission request and the layer processing units 20 to 70 that are successively passed the transmission request access the directory service unit 5 and The entry point to the processing unit to which the next processing is to be passed is obtained. Here, the operation of the directory service unit 5 is the same as that of the embodiment of the first invention described above. However, when called from the layer 5 processing unit 40, the entry point to the layer 4 processing unit 55 or the layer 4 processing unit 56 to the layer 4 processing unit 56 is determined according to which the processing unit pointer for the stack identifier 5 in the table of FIG. Returns the entry point. As a result, the data can be distributed to an appropriate one among the plurality of layer 4 processing units each time the data is transmitted. Also, when data is received from another communication protocol processing device, the directory service unit 5 is used as in the first embodiment of the invention described above.
Is called, and the entry point of the processing unit to which the received data is to be passed next is returned to the stack identifier 5. However, when called from the layer 3 processing unit 60, the entry point to the layer 4 processing unit 55 or the layer 4 processing unit 56 to the layer 4 processing unit 55 is determined according to which the processing unit pointer for the stack identifier 5 in the table of FIG. Returns the entry point. As a result, there are multiple layers 4
Data can be distributed to an appropriate one of the processing units each time data is received. Although five examples have been described above, these examples can be implemented not only individually but also in combination.

[0034]

As described above, according to the invention described in claim 1, since the protocol stack in which the middle layer is omitted can be supported, the communication protocol processing in which the protocol stack which cannot be implemented by the conventional technology is implemented. The device can be obtained. According to the invention of claim 2,
It is possible to obtain a communication protocol processing device that supports a plurality of protocol stacks having different protocols at the middle layer on the same device. Further, according to the third aspect of the present invention, since a plurality of processing units for layers having a large processing load can be provided, it is possible to obtain a high performance communication protocol processing device as compared with the conventional technology.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a table referred to by a directory service unit of a communication protocol processing device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing another configuration example of a table referred to by the directory service unit of the communication protocol processing device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a protocol control unit of a communication protocol processing device according to a fourth embodiment of the present invention.

FIG. 4 is a diagram showing a configuration example of a table referred to by a directory service unit of a communication protocol processing device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a protocol control unit of a communication protocol processing device according to a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a configuration example of a table referred to by a directory service unit of a communication protocol processing device according to a fifth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional communication protocol processing device.

FIG. 8 is a diagram showing a configuration example of a table referred to by a directory service unit of a conventional communication protocol processing device.

[Explanation of symbols] 3 Communication protocol control unit 5 Directory service unit

Claims (3)

[Claims] 1. A communication protocol processing device for processing a hierarchical protocol, wherein a protocol processing unit for each layer having an entry point and a protocol stack identifier for identifying a hierarchical protocol are input to the protocol processing unit. Each of the protocol processing units or a processing unit to which data is input first among the protocol processing units has a directory service unit that outputs an entry point and sends a protocol stack identifier to the directory service unit. Input, and the directory service unit internally corresponds to the protocol stack identifier, a table showing a series of entry points to the processing units to be used in the protocol processing unit, or whether the protocol processing unit is used for each layer. Showing table With an entry point to one of the protocol processing units to process data immediately after based on the protocol stack identifier input by the table, or to one or more protocol processing units to process data thereafter. Prints the entry point column of
By the above operation, not only a protocol stack having protocols of all layers but also a protocol stack having no protocols of some layers can be processed. 2. A communication protocol processing device for processing a hierarchical protocol, comprising a protocol processing unit for each layer having an entry point, or for each different protocol in the same layer, and a protocol stack identifier for identifying the hierarchical protocol. It has a directory service unit for inputting and outputting an entry point to the protocol processing unit, and in data transmission / reception, each of the protocol processing units or a processing unit to which data is first input among the protocol processing units is A protocol stack identifier is input to the directory service unit, and the directory service unit internally corresponds to the protocol stack identifier in a table showing a series of entry points to the protocol processing unit to be used in the protocol processing unit, or a directory. Each table has a table indicating whether or not the protocol processing unit is used, and an entry point to one of the protocol processing units which should immediately process data based on the protocol stack identifier input by the table, or data thereafter. Output a sequence of entry points to one or more of the protocol processing units,
By the above operation, a communication protocol processing device characterized in that a plurality of protocol stacks can simultaneously process even those having different protocols in the same layer. 3. A communication protocol processing device for processing a hierarchical protocol, each protocol layer having an entry point, and a plurality of protocol processing units for processing the same protocol, and a protocol stack identifier for identifying the hierarchical protocol. Has a directory service unit for inputting an entry point to the protocol processing unit, and in data transmission / reception, each of the protocol processing units or a processing unit to which data is first input in the protocol processing unit. Inputs a protocol stack identifier to the directory service unit, and the directory service unit internally has a table in which a protocol stack identifier and a series of entry points to the protocol processing unit are associated with each other, and the directory processing unit is the same among the protocol processing units. Protocol For a plurality of protocol processing units that process a protocol, the table is maintained so that an entry point to any of the processing units is made to correspond to the load state of the processing unit, and the protocol stack identifier input by the table is used. Based on the above, it outputs the entry point to one of the protocol processing units which should process the data immediately after, or the sequence of entry points to one or more protocol processing units which should process the data thereafter, and the same operation is performed by the above operation. A communication protocol processing device, wherein protocol processing is distributed to a plurality of protocol processing units that process the same protocol so that a plurality of protocol processing units can be used for protocol processing of a layer with a heavy load.