CA2295279A1 - Communication processing apparatus, superior system thereof, communication processing system, communication processing system network and communication processing process - Google Patents
Communication processing apparatus, superior system thereof, communication processing system, communication processing system network and communication processing process Download PDFInfo
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- CA2295279A1 CA2295279A1 CA 2295279 CA2295279A CA2295279A1 CA 2295279 A1 CA2295279 A1 CA 2295279A1 CA 2295279 CA2295279 CA 2295279 CA 2295279 A CA2295279 A CA 2295279A CA 2295279 A1 CA2295279 A1 CA 2295279A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5665—Interaction of ATM with other protocols
- H04L2012/5667—IP over ATM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
- H04L2012/5681—Buffer or queue management
Abstract
A system has a communication apparatus, in which a plurality of mutually different network interfaces are provided, without increasing complexity of the overall system.
The communication processing apparatus includes data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data, and identification information adding means for adding an identification information for identifying the network received from the reception data among the plurality of kinds of networks to data divided by the data dividing means to establish a fixed length data, for transmitting the fixed length data added the identification information to a superior unit.
The communication processing apparatus includes data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data, and identification information adding means for adding an identification information for identifying the network received from the reception data among the plurality of kinds of networks to data divided by the data dividing means to establish a fixed length data, for transmitting the fixed length data added the identification information to a superior unit.
Description
, .~ CA 02295279 2000-O1-12 COMMUNICATION PROCESSING APPARATUS, SUPERIOR SYSTEM THEREOF, COMMUNICATION PROCESSING SYSTEM, COMMUNICATION PROCESSING SYSTEM NETWORK AND
COMMUNICATION PROCESSING PROCESS
BACKGROUND OF THE TNVRNTTnN
Field of the Invention The present invention relates generally to a communication processing apparatus, a superior system thereof, a communication processing system, a communication processing system network and a communication processing process . More particularly, the invention relates to communication processing apparatus, a superior system thereof, a communication processing system, a communication processing system network and a communication processing process adapted for receiving data from a plurality kind of mutually distinct networks.
Description of the Relaters rt As shown in Fig. 11, conventionally, when a plurality of networks are built in one communication processing apparatus, a plurality of hardware of mutually distinct specifications for terminating respective networks become necessary for respective network interfaces. As shown in Fig. 11, it is required an Ethernet device 31-1, a PPP (Point to Point Protocol) device 31-2 and an ATM (Asynchronous Transfer Mode) device 31-3. On the other hand, in order top process data received from respective networks by a superior software 5, respective drivers 2-1 to 2-3 corresponding to respective devices 31-1 to 31-3 become necessary.
Normally, specifications of these network interfaces are mutually different. In proportion to number of network interfaces, complexity of the overall system is increased to require a long design period. On the other hand, in the conventional system construction, upon adding new network interface, influence extends over the overall system to cause difficulty in assuring scalability. Upon incorporating a plurality of network interface, complexity of control is increased in proportion to number of interfaces to be incorporated to increase scale of design of both of hardware/software and to cause prolongation of design period.
SUI~'LM_ARV OF THE TNVRNTT(~N
The present invention has been worked out for solving the problem in the prior art. Therefore, it is an object of the present invention to provide a communication processing apparatus, a superior system thereof, a communication processing system, a communication processing system network and a communication processing process, which may not increase complexity of construction of an overall system even when a plurality of different interfaces are established.
According to the first aspect of the present invention, a communication processing apparatus comprises:
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from the reception data among the plurality of kinds of networks to data divided by the data dividing means to establish a fixed length data, for transmitting the fixed length data added the identification information to a superior unit.
According to the second aspect of the present invention, a superior unit connected to a communication processing apparatus transmitting a received data in a form of a fixed length data added an identification information identifying a network,. through which the received data is received, comprises:
data reading means for reading out the fixed length data from a memory storing the fixed length data; and data processing means for performing process corresponding to identification information added to the fixed length data read out from the memory for the data.
According to the third aspect of the present invention, a communication processing system comprises:
communication processing apparatus including:
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from the reception data among the plurality of kinds of networks to data divided by the data dividing means to establish a fixed length data, for transmitting the fixed length data added the identification information to a superior unit;
a superior unit including:
data reading means for reading out the fixed length data from a memory storing the fixed length data; and data processing means for performing process corresponding to identification information added to the fixed length data read out from the memory for the data.
According to the fourth aspect of the present invention, a communication processing system network comprises:
a plurality of communication processing systems set forth above;
a common network provided commonly to the plurality of communication processing systems, for mutually exchanging a fixed length data between the plurality of communication processing systems via the common network.
According to the fifth aspect of the present invention, a communication processing method comprises the steps of:
a step of dividing a received data received from one of a plurality of mutually different kinds of networks into a predetermined length of data;
a step of reading out the received data in a predetermined data amount and adding identification information identifying the network, through which the received data is received, for establishing a fixed length data; and a step of transmitting the fixed length data added the identification information to a superior unit.
In short, in the apparatus set forth above, the packet data arriving from a plurality of mutually different network interfaces is divided into a plurality of data fractions to establish fixed length data of a list structure by adding header indicating network information through which the packet arrives . Namely, by the network kind information in the header, the fixed length data are connected in a chain form to establish a list structure. Then, per the fixed length data, process corresponding to kind of the network is performed. Therefore, driver software managing interface with hardware required is only one driver parsing only structure of the fixed length data.
Accordingly, it becomes unnecessary to provide a plurality of network drivers.
On the other hand, the hardware may perform only operation for writing the arriving packet to a memory according to the , CA 02295279 2000-O1-12 preliminarily defined fixed length buffer. Then, these features, in the communication apparatus having a plurality of interfaces, packet data management, simplification of control structure, reduction of hardware resource and software resource can be achieved.
The present invention will be understood more fully from the detailed description given hereinafter and from the accompanying drawings of the preferred embodiment of the present invention, which, however, should not be taken to be limitative to the invention, but are for explanation and understanding only.
In the drawings:
Fig. 1 is an illustration showing a system construction of one embodiment of a communication processing apparatus according to the present invention;
Fig. 2 is an illustration showing a construction of a fixed length data stored with dividing a memory;
Fig. 3 is a block diagram showing an example of a particular construction of the communication processing apparatus;
Fig. 4 is a block diagram showing an example of an internal construction of each network interface in Fig. 1;
Fig. 5 is a flowchart showing operation of respective part of Fig. 1;
Fig. 6 is a block diagram showing one example of a constructionfor connection between each network interface and a packet store memory (PSM) in Fig. 1;
Fig. 7 is a block diagram showing another example of a construction for connection between each network interface and a packet store memory (PSM) in Fig. 1;
Fig. 8 is a block diagram showing a detailed connection in the case of connection of Fig. 6;
Fig. 9 is a block diagram showing a detailed connection in the case of connection of Fig. 7;
Fig. 10 is a block diagram showing a construction of one embodiment of a communication processing system network according to the present invention; and Fig. 11 is a block diagram showing a construction of the conventional communication processing apparatus.
The present invention will be discussed hereinafter in detail in terms of the preferred embodiment of the present invention with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be obvious, however, to those skilled in the art that the present invention may be practiced without these specific details. In other instance, well-known structure are not shown in detail in order to avoid unnecessary _ g _ obscurity of the present invention.
Fig . 1 is an illustration showing a system construction showing one embodiment of a communication processing system according to the present invention. In Fig. 1, the shown embodiment of the communication processing system has a hardware portion including network interfaces 1-1 to 1-3 and a packet store memory (PSM) 2, a software portion consisted of network drivers 4 and a superior software 5, and a buffer interface 3 interfacing the hardware portion and the software portion. Here, as network interfaces 1-1 to 1-3, mutually distinct three kinds of "Net A", "Net B" and "Net C" are exemplarily established in one communication processing system.
Packet data received from a plurality of mutually distinct network interfaces 1-1 to 1-3 are stored in the PSM
2 irrespective of media of input. In this case, the received packet data is stored in the PSM 2 with dividing into fixed length data having a list structure.
On the other hand, when the packet data is stored in a fixed length buffer, port inputted that identification information for identifying the network through which the packet data is received, are written in headers of the packet data. By this, the superior software 5 makes judgment of the network through which the data is received.
Fig. 2 shows one example of a fixed length data having a list structure. At first, the fixed length data is stored in the PSM 2 per n bites . For example, as shown in Fig . 2 , the fixed length data is stored in the PSM 2 per 128 bytes, in the shown embodiment. In Fig. 2, "next" field 21 is a pointer pointing the next fixed length data. By this, a list structure is established. A "len" field 22 represents a size of data in the fixed length buffer, a "data" field 23 represents a data storage position pointer in the fixed length buffer. A "type"
field 24 indicatives whether the fixed length buffer contains the data at the leading end of the packet data in the case when the size of the packet data is too long to stored in the fixed length buffer size and thus is expressed by the list structure of a plurality of fixed length buffers.
A "pktlen" field 25 represents a size of an overall packet data. When the received packet data has a data length to be shorter than or equal to the data length of the fixed data length, the "len" field 22 and the "pltlen" field 25 should have the same value. An "input-id" filed 26 is a field used for making judgment of kind of the network interface used upon reception.
Data 20 is established by dividing the received packet data to predetermined length. And, data 20 becomes a payload portion for a header portion consisted of fields 21 to 26. In the shown embodiment, the header portion has 24 bytes and the payload portion has 104 bytes . It should be noted that amount of bytes in the header portion and the payload portion are not limited to the foregoing example to decrease amount of bytes of the header portion and to increase amount of bytes of the payload portion.
Data 20 stored in the payload portion is transferred to the superior software with maintaining the form of the fixed length as shown in Fig. 2, and is removed the header portion for connection of data based on the "next" field 21. Then, desired process is performed for the data.
Fig. 3 is a block diagram showing an example of particular construction of the shown embodiment of the communication processingsystem. The communication processingsystem,shown in Fig. 3, takes CPU 5-1 as a core of the overall system. And, OS(operating system) 5-2 operating on the CPU 5-1 manages the software. In the shown embodiment, there is provided respective input ports of an Ethernet device 31-1, a PPP device 31-2 and an ATM device 31-3,as network interface. As a network superior protocols, TCP/IP protocol consisted of an IP layer (Internet Protocol Layer) 5-3, a TCP layer (Transmission Control Protocol Layer ) 5-5, a UDP layer ( User Datagram Protocol Layer) 5-6 and a socket interface layer 5-7, and an ATM protocol 5-4 are loaded.
On the other hand, superior to OS 5-2 and the socket interface layer 5-6, an API (Application programming Interface) 5-8 is positioned. This API 5-8 performs own process of application software using the received data.
In the construction shown in Fig. 3, it is not necessary for providing a plurality of the network drivers 4 and is required to provide only one driver having a function for accessing a fixed length data in the PSM 2. Next, discussion will be given for an example of process with reference to Fig.
3. Now, it is assumed that a packet data is received through the Ethernet port of the communication processing system. Then, the Ethernet device 31-1 reserves regions for storing a plurality of fixed length data in a form of a list structure on the PSM 2 if the received packet size is greater than or equal to a predetermined fixed length buffer size, to copy the packet data . Upon completion of copying of the packet data to the PSM 2, the Ethernet device 31-1 notifies completion of copying to the network driver 4. In response to this, the network driver 4 is activated. Then, the network driver 4 parses content of the fixed length data to transfer the process to the IP layer 5-3 to terminate operation.
In the shown embodiment of the communication processing system, irrespective of the network interface (in the shown case, the Ethernet device 31-1, the PPP device 31-2 and the ATM device 31-3), through which the packet is received, the following items are common . Namely, the network device copies the fixed length data to the regions reserved for the fixed length data on the PSM 2. The network driver 4 is required to provide one driver for reading out the fixed length data as . . CA 02295279 2000-O1-12 interface with the hardware.
Next, discussion will be given for an example of the internal construction of the network interface in Fig. 1, with reference to Fig. 4. In Fig. 4, there is shown an example of the internal construction of the Ethernet device 31-1 in Fig.
1. Referring to Fig. 4, the Ethernet device 31-1 includes a buffer 32 for accumulating data received from the Ethernet, a control circuit 33 for managing a write pointer WP and a read pointer RP for the buffer 32 and a header adding portion 34 for generating and adding a header.
In such construction, the write pointer WP and the read pointer RP are managed to read out data of a predetermined number of bytes ( a . g . 104 bytes ) from the buffer 32 . Then, the header of the predetermined number of bytes ( a . g . 24 bytes ) is added to the read out data by the header adding portion 34. By this, the fixed length data (e. g. data of 128 bytes) is generated.
Then, the fixed length data thus generated is stored in the PSM 2 set forth above.
And, data read out sequentially from the buffer 32 for the header adding sequentially, also. Then, the fixed length data in a form as shown Fig.2, is generated sequentially.
Returning to Fig . 3 , the f fixed length data stored in the PSM 2 is received by the superior software via the buffer interface 3 and the network driver 4 to perform the predetermined process. In this case, the fixed length data is sequentially written in a working main memory ( not shown ) under control of CPU 5-1. At this time, with reference to the "next"
field of the header added to the fixed length data, connection of data is performed. At this time, after deleting the header added to the fixed length data, data connection is performed.
In short, in the shown embodiment of the system, a communication processing method shown in Fig. 5 is executed.
Namely, referring to Fig. 5, upon reception of data from the network (step S51), the received data is accumulated in~the buffer in the network interface. Then, for the accumulated received data, data size is checked ( step S52 ) to reserve necessary number of regions for storing the fixed length data in the PSM 2 (step S53).
After reserving the region, the header is generated by the header adding portion 34 ( see Fig. 4 ) ( step S54 ) to write the fixed length data consisted of the header and the data in the region (step S55). When the received data extend over a plurality of regions, steps S53 to S55 are repeatedly executed as shown in broken line. Namely, reserving of the fixed length data storage regions ( step S53 ) , generation of the header ( step S54) and writing of the fixed length data (step S55) are repeatedly executed. By this, the received data is dividingly written in the PSM 2 per the fixed length.
Upon completion of writing of the received data to the PSM 2, completion of data writing is notified to the network . CA 02295279 2000-O1-12 driver (step S56). Then, the superior software receives data by performing reading out of the fixed length data for the PSM
2 (step S57).
While discussion has been given for the case where the data is received from the network, opposite operation will be performed even for the case of transmission of data to the network, namely, the fixed length data including header is written in the PSM 2 by the superior software. After reading out and connecting the fixed length data by each network interface, the data is transmitted to the network.
On the other hand, various kinds of constructions of connection between each network interface and the PSM 2 in Fig.
1 are considered. In one example of this, each network interface 1-1 to 1-3 and the PSM 2 are connected to the same bus B so that writing and reading of data in and out the PSM
2 is controlled by CPU 10 as superior unit. In another example, as shown in Fig.ll, CPU 10 and PSM 2 are connected to a bus B1 which is different from a bus B2, to which each network interface 1-1 to 1-3 and the PSM 2 are connected, and known dual port memory is used. In either construction, CPU 10 performs predetermined operation according to the content of the superior software of Fig. 1. In this case, to the buffer interface 3 in Fig. 1. buses B, B1 and B2 illustrated in Figs.
6 and 7 are included.
In case of the construction shown in Fig. 6, writing of the fixed length data is performed with designating an address ADDR and data DATA from each network interface 1-1 to 1-3 from the PSM 2, and reading of the fixed length data is performed with designating an address ADDR and data DATA from CPU 10 to the PSM 2, as shown in Fig. 8. It should be noted that, in this case, access arbitration is performed for the PSM 2 by a not shown memory controller.
On the other hand, in case of the construction shown in Fig. 7, as shown in Fig. 9, data writing requests (Req) are transmitted respectively from each network interface 1-1 to 1-3 to the PSM 2. Then, the network interface receiving a response (Ack) performs writing of the fixed length data. At this time, the address ADDR and data DATA are designated from each network interfaces 1-1 to 1-3 to the PSM 2 . Upon completion of writing, the network interface notifies completion of writing to CPU 10 as the superior unit by interruption using a not shown signal line, CPU 10 performs reading of the fixed length data designating the address ADDR and data DATA for the PSM 2.
In case of Figs. 6 to 9, for all cases, the PSM 2 for storing reception data is provided commonly to respective network interfaces. However, it is also possible to provide memories corresponding to respective network interfaces in one-to-one basis. By providing the memory in common for respective interfaces in the foregoing embodiment, construction of the overall system can be made compact to be beneficial for reduction of cost and size of casing.
Here, the network interfaces 1-1 to 1-3 set forth above are known network interfaces, such as Ethernet, PPP, ATM and so forth. However, the shown system is applicable even for other cases . Namely, the shown system is applicable even for systems, in which a plurality of other general purpose I/0 devices, such as DART (Universal Asynchronous Receiver-Transceiver ) , PIO ( Programmed Input/output ) , printer port and so forth, are present. Furthermore, upon establishing connection with equipments handling digital data, such as a digital camera and so forth, it is clear to widely apply the shown system.
Furthermore, in the shown system may handle the network interface which can be standardized toward the future or the network interface of unique in each equipment maker. Namely, data output from the network interface is handled dividingly in a form of fixed length data to simplify handling of data.
For example, as shown in Fig. 10, a plurality of communication processing systems are provided. The plurality of communication processing systems are mutually connected by "Next" network interface 1-4. In this case, the network interface 1-4 may be newly developed one . Then, if the network interface 1-4 has a construction for exchanging received data in a form of fixed length data set forth above, data can be exchanged between a plurality of communication processing systems in a form of fixed length data. In this case, since CPUs l0a and lOb and the PSMs 2a and 2b are provided in the systems 100 and 200, respectively, distributed process can be performed for data reception. Therefore, process load may not be concentrated to one of CPUs. By making reference to the "next" field of the header included in the fixed length data, original data can be restored as set forth above.
On the other hand, when data reception is performed with connecting a large number of network interfaces to one bus, substantial load can be applied to CPU, and also a large number of slots for inserting the network interface boards becomes necessary to make the system casing for storing the shown system large to result in higher cost. In contrast to this, with the construction, in which small number of network interfaces ( four as shown, for example) are connected to one bus, the system casing can be satisfactorily compact and cost can be low. By making the at least one of network interfaces as common interface, as the network interface 1-4 set forth above, the shown system may be further added as required and mutually connecting these systems is established, both of compactness and superior extension ability of the system can be achieved.
Therefore, the shown system is considered as particularly optima for SOHO (Small office Home Office).
On the other hand, all of network interfaces 1-la to 1-3a, 1-lb to 1-3b respectively connected to the communication processing systems 100 and 200 are interfaces for different kinds of networks, data can be easily exchanged between different networks by exchanging fixed length data between the systems 100 and 200 via the network interface 1-4 . Furthermore, it is clear to establish the communication processing system network by connecting further large number of communication processing systems with each other.
As set forth above, upon incorporating a plurality of mutually different network interfaces in one communication processing apparatus, hardware of different functions and software corresponding thereto become necessary. Thus, complexity of the overall system tends to be increased. In contrast to this, by the shown system, the hardware and software which have been separately designed per network interface in the past, can be simplified by unifying to the fixed length buffer interface via the memory.
As set forth above, the present invention does not require to provide hardware having different functions and software corresponding to such hardware, and thus complexity of the overall system will never be increased by dividing the data received from mutually different kinds of networks, transmits to the superior unit with adding identification information identifying the network through which data is received, and performs the process in the superior unit depending upon the content of the identification information.
Although the present invention has been illustrated and described with respect to exemplary embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omission and additions may be made therein and thereto, without departing from the spirit and scope of the present invention. Therefore, the present invention should not be understood as limited to the specific embodiment set out above but to include all possible embodiments which can be embodied within a scope encompassed and equivalent thereof with respect to the feature set out in the appended claims.
Although the present invention has been illustrated and described with respect to exemplary embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omission and additions may be made therein and thereto, without departing from the spirit and scope of the present invention. Therefore, the present invention should not be understood as limited to the specific embodiment set out above but to include all possible embodiments which can be embodied within a scope encompassed and equivalent thereof with respect to the feature set out in the appended claims.
COMMUNICATION PROCESSING PROCESS
BACKGROUND OF THE TNVRNTTnN
Field of the Invention The present invention relates generally to a communication processing apparatus, a superior system thereof, a communication processing system, a communication processing system network and a communication processing process . More particularly, the invention relates to communication processing apparatus, a superior system thereof, a communication processing system, a communication processing system network and a communication processing process adapted for receiving data from a plurality kind of mutually distinct networks.
Description of the Relaters rt As shown in Fig. 11, conventionally, when a plurality of networks are built in one communication processing apparatus, a plurality of hardware of mutually distinct specifications for terminating respective networks become necessary for respective network interfaces. As shown in Fig. 11, it is required an Ethernet device 31-1, a PPP (Point to Point Protocol) device 31-2 and an ATM (Asynchronous Transfer Mode) device 31-3. On the other hand, in order top process data received from respective networks by a superior software 5, respective drivers 2-1 to 2-3 corresponding to respective devices 31-1 to 31-3 become necessary.
Normally, specifications of these network interfaces are mutually different. In proportion to number of network interfaces, complexity of the overall system is increased to require a long design period. On the other hand, in the conventional system construction, upon adding new network interface, influence extends over the overall system to cause difficulty in assuring scalability. Upon incorporating a plurality of network interface, complexity of control is increased in proportion to number of interfaces to be incorporated to increase scale of design of both of hardware/software and to cause prolongation of design period.
SUI~'LM_ARV OF THE TNVRNTT(~N
The present invention has been worked out for solving the problem in the prior art. Therefore, it is an object of the present invention to provide a communication processing apparatus, a superior system thereof, a communication processing system, a communication processing system network and a communication processing process, which may not increase complexity of construction of an overall system even when a plurality of different interfaces are established.
According to the first aspect of the present invention, a communication processing apparatus comprises:
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from the reception data among the plurality of kinds of networks to data divided by the data dividing means to establish a fixed length data, for transmitting the fixed length data added the identification information to a superior unit.
According to the second aspect of the present invention, a superior unit connected to a communication processing apparatus transmitting a received data in a form of a fixed length data added an identification information identifying a network,. through which the received data is received, comprises:
data reading means for reading out the fixed length data from a memory storing the fixed length data; and data processing means for performing process corresponding to identification information added to the fixed length data read out from the memory for the data.
According to the third aspect of the present invention, a communication processing system comprises:
communication processing apparatus including:
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from the reception data among the plurality of kinds of networks to data divided by the data dividing means to establish a fixed length data, for transmitting the fixed length data added the identification information to a superior unit;
a superior unit including:
data reading means for reading out the fixed length data from a memory storing the fixed length data; and data processing means for performing process corresponding to identification information added to the fixed length data read out from the memory for the data.
According to the fourth aspect of the present invention, a communication processing system network comprises:
a plurality of communication processing systems set forth above;
a common network provided commonly to the plurality of communication processing systems, for mutually exchanging a fixed length data between the plurality of communication processing systems via the common network.
According to the fifth aspect of the present invention, a communication processing method comprises the steps of:
a step of dividing a received data received from one of a plurality of mutually different kinds of networks into a predetermined length of data;
a step of reading out the received data in a predetermined data amount and adding identification information identifying the network, through which the received data is received, for establishing a fixed length data; and a step of transmitting the fixed length data added the identification information to a superior unit.
In short, in the apparatus set forth above, the packet data arriving from a plurality of mutually different network interfaces is divided into a plurality of data fractions to establish fixed length data of a list structure by adding header indicating network information through which the packet arrives . Namely, by the network kind information in the header, the fixed length data are connected in a chain form to establish a list structure. Then, per the fixed length data, process corresponding to kind of the network is performed. Therefore, driver software managing interface with hardware required is only one driver parsing only structure of the fixed length data.
Accordingly, it becomes unnecessary to provide a plurality of network drivers.
On the other hand, the hardware may perform only operation for writing the arriving packet to a memory according to the , CA 02295279 2000-O1-12 preliminarily defined fixed length buffer. Then, these features, in the communication apparatus having a plurality of interfaces, packet data management, simplification of control structure, reduction of hardware resource and software resource can be achieved.
The present invention will be understood more fully from the detailed description given hereinafter and from the accompanying drawings of the preferred embodiment of the present invention, which, however, should not be taken to be limitative to the invention, but are for explanation and understanding only.
In the drawings:
Fig. 1 is an illustration showing a system construction of one embodiment of a communication processing apparatus according to the present invention;
Fig. 2 is an illustration showing a construction of a fixed length data stored with dividing a memory;
Fig. 3 is a block diagram showing an example of a particular construction of the communication processing apparatus;
Fig. 4 is a block diagram showing an example of an internal construction of each network interface in Fig. 1;
Fig. 5 is a flowchart showing operation of respective part of Fig. 1;
Fig. 6 is a block diagram showing one example of a constructionfor connection between each network interface and a packet store memory (PSM) in Fig. 1;
Fig. 7 is a block diagram showing another example of a construction for connection between each network interface and a packet store memory (PSM) in Fig. 1;
Fig. 8 is a block diagram showing a detailed connection in the case of connection of Fig. 6;
Fig. 9 is a block diagram showing a detailed connection in the case of connection of Fig. 7;
Fig. 10 is a block diagram showing a construction of one embodiment of a communication processing system network according to the present invention; and Fig. 11 is a block diagram showing a construction of the conventional communication processing apparatus.
The present invention will be discussed hereinafter in detail in terms of the preferred embodiment of the present invention with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be obvious, however, to those skilled in the art that the present invention may be practiced without these specific details. In other instance, well-known structure are not shown in detail in order to avoid unnecessary _ g _ obscurity of the present invention.
Fig . 1 is an illustration showing a system construction showing one embodiment of a communication processing system according to the present invention. In Fig. 1, the shown embodiment of the communication processing system has a hardware portion including network interfaces 1-1 to 1-3 and a packet store memory (PSM) 2, a software portion consisted of network drivers 4 and a superior software 5, and a buffer interface 3 interfacing the hardware portion and the software portion. Here, as network interfaces 1-1 to 1-3, mutually distinct three kinds of "Net A", "Net B" and "Net C" are exemplarily established in one communication processing system.
Packet data received from a plurality of mutually distinct network interfaces 1-1 to 1-3 are stored in the PSM
2 irrespective of media of input. In this case, the received packet data is stored in the PSM 2 with dividing into fixed length data having a list structure.
On the other hand, when the packet data is stored in a fixed length buffer, port inputted that identification information for identifying the network through which the packet data is received, are written in headers of the packet data. By this, the superior software 5 makes judgment of the network through which the data is received.
Fig. 2 shows one example of a fixed length data having a list structure. At first, the fixed length data is stored in the PSM 2 per n bites . For example, as shown in Fig . 2 , the fixed length data is stored in the PSM 2 per 128 bytes, in the shown embodiment. In Fig. 2, "next" field 21 is a pointer pointing the next fixed length data. By this, a list structure is established. A "len" field 22 represents a size of data in the fixed length buffer, a "data" field 23 represents a data storage position pointer in the fixed length buffer. A "type"
field 24 indicatives whether the fixed length buffer contains the data at the leading end of the packet data in the case when the size of the packet data is too long to stored in the fixed length buffer size and thus is expressed by the list structure of a plurality of fixed length buffers.
A "pktlen" field 25 represents a size of an overall packet data. When the received packet data has a data length to be shorter than or equal to the data length of the fixed data length, the "len" field 22 and the "pltlen" field 25 should have the same value. An "input-id" filed 26 is a field used for making judgment of kind of the network interface used upon reception.
Data 20 is established by dividing the received packet data to predetermined length. And, data 20 becomes a payload portion for a header portion consisted of fields 21 to 26. In the shown embodiment, the header portion has 24 bytes and the payload portion has 104 bytes . It should be noted that amount of bytes in the header portion and the payload portion are not limited to the foregoing example to decrease amount of bytes of the header portion and to increase amount of bytes of the payload portion.
Data 20 stored in the payload portion is transferred to the superior software with maintaining the form of the fixed length as shown in Fig. 2, and is removed the header portion for connection of data based on the "next" field 21. Then, desired process is performed for the data.
Fig. 3 is a block diagram showing an example of particular construction of the shown embodiment of the communication processingsystem. The communication processingsystem,shown in Fig. 3, takes CPU 5-1 as a core of the overall system. And, OS(operating system) 5-2 operating on the CPU 5-1 manages the software. In the shown embodiment, there is provided respective input ports of an Ethernet device 31-1, a PPP device 31-2 and an ATM device 31-3,as network interface. As a network superior protocols, TCP/IP protocol consisted of an IP layer (Internet Protocol Layer) 5-3, a TCP layer (Transmission Control Protocol Layer ) 5-5, a UDP layer ( User Datagram Protocol Layer) 5-6 and a socket interface layer 5-7, and an ATM protocol 5-4 are loaded.
On the other hand, superior to OS 5-2 and the socket interface layer 5-6, an API (Application programming Interface) 5-8 is positioned. This API 5-8 performs own process of application software using the received data.
In the construction shown in Fig. 3, it is not necessary for providing a plurality of the network drivers 4 and is required to provide only one driver having a function for accessing a fixed length data in the PSM 2. Next, discussion will be given for an example of process with reference to Fig.
3. Now, it is assumed that a packet data is received through the Ethernet port of the communication processing system. Then, the Ethernet device 31-1 reserves regions for storing a plurality of fixed length data in a form of a list structure on the PSM 2 if the received packet size is greater than or equal to a predetermined fixed length buffer size, to copy the packet data . Upon completion of copying of the packet data to the PSM 2, the Ethernet device 31-1 notifies completion of copying to the network driver 4. In response to this, the network driver 4 is activated. Then, the network driver 4 parses content of the fixed length data to transfer the process to the IP layer 5-3 to terminate operation.
In the shown embodiment of the communication processing system, irrespective of the network interface (in the shown case, the Ethernet device 31-1, the PPP device 31-2 and the ATM device 31-3), through which the packet is received, the following items are common . Namely, the network device copies the fixed length data to the regions reserved for the fixed length data on the PSM 2. The network driver 4 is required to provide one driver for reading out the fixed length data as . . CA 02295279 2000-O1-12 interface with the hardware.
Next, discussion will be given for an example of the internal construction of the network interface in Fig. 1, with reference to Fig. 4. In Fig. 4, there is shown an example of the internal construction of the Ethernet device 31-1 in Fig.
1. Referring to Fig. 4, the Ethernet device 31-1 includes a buffer 32 for accumulating data received from the Ethernet, a control circuit 33 for managing a write pointer WP and a read pointer RP for the buffer 32 and a header adding portion 34 for generating and adding a header.
In such construction, the write pointer WP and the read pointer RP are managed to read out data of a predetermined number of bytes ( a . g . 104 bytes ) from the buffer 32 . Then, the header of the predetermined number of bytes ( a . g . 24 bytes ) is added to the read out data by the header adding portion 34. By this, the fixed length data (e. g. data of 128 bytes) is generated.
Then, the fixed length data thus generated is stored in the PSM 2 set forth above.
And, data read out sequentially from the buffer 32 for the header adding sequentially, also. Then, the fixed length data in a form as shown Fig.2, is generated sequentially.
Returning to Fig . 3 , the f fixed length data stored in the PSM 2 is received by the superior software via the buffer interface 3 and the network driver 4 to perform the predetermined process. In this case, the fixed length data is sequentially written in a working main memory ( not shown ) under control of CPU 5-1. At this time, with reference to the "next"
field of the header added to the fixed length data, connection of data is performed. At this time, after deleting the header added to the fixed length data, data connection is performed.
In short, in the shown embodiment of the system, a communication processing method shown in Fig. 5 is executed.
Namely, referring to Fig. 5, upon reception of data from the network (step S51), the received data is accumulated in~the buffer in the network interface. Then, for the accumulated received data, data size is checked ( step S52 ) to reserve necessary number of regions for storing the fixed length data in the PSM 2 (step S53).
After reserving the region, the header is generated by the header adding portion 34 ( see Fig. 4 ) ( step S54 ) to write the fixed length data consisted of the header and the data in the region (step S55). When the received data extend over a plurality of regions, steps S53 to S55 are repeatedly executed as shown in broken line. Namely, reserving of the fixed length data storage regions ( step S53 ) , generation of the header ( step S54) and writing of the fixed length data (step S55) are repeatedly executed. By this, the received data is dividingly written in the PSM 2 per the fixed length.
Upon completion of writing of the received data to the PSM 2, completion of data writing is notified to the network . CA 02295279 2000-O1-12 driver (step S56). Then, the superior software receives data by performing reading out of the fixed length data for the PSM
2 (step S57).
While discussion has been given for the case where the data is received from the network, opposite operation will be performed even for the case of transmission of data to the network, namely, the fixed length data including header is written in the PSM 2 by the superior software. After reading out and connecting the fixed length data by each network interface, the data is transmitted to the network.
On the other hand, various kinds of constructions of connection between each network interface and the PSM 2 in Fig.
1 are considered. In one example of this, each network interface 1-1 to 1-3 and the PSM 2 are connected to the same bus B so that writing and reading of data in and out the PSM
2 is controlled by CPU 10 as superior unit. In another example, as shown in Fig.ll, CPU 10 and PSM 2 are connected to a bus B1 which is different from a bus B2, to which each network interface 1-1 to 1-3 and the PSM 2 are connected, and known dual port memory is used. In either construction, CPU 10 performs predetermined operation according to the content of the superior software of Fig. 1. In this case, to the buffer interface 3 in Fig. 1. buses B, B1 and B2 illustrated in Figs.
6 and 7 are included.
In case of the construction shown in Fig. 6, writing of the fixed length data is performed with designating an address ADDR and data DATA from each network interface 1-1 to 1-3 from the PSM 2, and reading of the fixed length data is performed with designating an address ADDR and data DATA from CPU 10 to the PSM 2, as shown in Fig. 8. It should be noted that, in this case, access arbitration is performed for the PSM 2 by a not shown memory controller.
On the other hand, in case of the construction shown in Fig. 7, as shown in Fig. 9, data writing requests (Req) are transmitted respectively from each network interface 1-1 to 1-3 to the PSM 2. Then, the network interface receiving a response (Ack) performs writing of the fixed length data. At this time, the address ADDR and data DATA are designated from each network interfaces 1-1 to 1-3 to the PSM 2 . Upon completion of writing, the network interface notifies completion of writing to CPU 10 as the superior unit by interruption using a not shown signal line, CPU 10 performs reading of the fixed length data designating the address ADDR and data DATA for the PSM 2.
In case of Figs. 6 to 9, for all cases, the PSM 2 for storing reception data is provided commonly to respective network interfaces. However, it is also possible to provide memories corresponding to respective network interfaces in one-to-one basis. By providing the memory in common for respective interfaces in the foregoing embodiment, construction of the overall system can be made compact to be beneficial for reduction of cost and size of casing.
Here, the network interfaces 1-1 to 1-3 set forth above are known network interfaces, such as Ethernet, PPP, ATM and so forth. However, the shown system is applicable even for other cases . Namely, the shown system is applicable even for systems, in which a plurality of other general purpose I/0 devices, such as DART (Universal Asynchronous Receiver-Transceiver ) , PIO ( Programmed Input/output ) , printer port and so forth, are present. Furthermore, upon establishing connection with equipments handling digital data, such as a digital camera and so forth, it is clear to widely apply the shown system.
Furthermore, in the shown system may handle the network interface which can be standardized toward the future or the network interface of unique in each equipment maker. Namely, data output from the network interface is handled dividingly in a form of fixed length data to simplify handling of data.
For example, as shown in Fig. 10, a plurality of communication processing systems are provided. The plurality of communication processing systems are mutually connected by "Next" network interface 1-4. In this case, the network interface 1-4 may be newly developed one . Then, if the network interface 1-4 has a construction for exchanging received data in a form of fixed length data set forth above, data can be exchanged between a plurality of communication processing systems in a form of fixed length data. In this case, since CPUs l0a and lOb and the PSMs 2a and 2b are provided in the systems 100 and 200, respectively, distributed process can be performed for data reception. Therefore, process load may not be concentrated to one of CPUs. By making reference to the "next" field of the header included in the fixed length data, original data can be restored as set forth above.
On the other hand, when data reception is performed with connecting a large number of network interfaces to one bus, substantial load can be applied to CPU, and also a large number of slots for inserting the network interface boards becomes necessary to make the system casing for storing the shown system large to result in higher cost. In contrast to this, with the construction, in which small number of network interfaces ( four as shown, for example) are connected to one bus, the system casing can be satisfactorily compact and cost can be low. By making the at least one of network interfaces as common interface, as the network interface 1-4 set forth above, the shown system may be further added as required and mutually connecting these systems is established, both of compactness and superior extension ability of the system can be achieved.
Therefore, the shown system is considered as particularly optima for SOHO (Small office Home Office).
On the other hand, all of network interfaces 1-la to 1-3a, 1-lb to 1-3b respectively connected to the communication processing systems 100 and 200 are interfaces for different kinds of networks, data can be easily exchanged between different networks by exchanging fixed length data between the systems 100 and 200 via the network interface 1-4 . Furthermore, it is clear to establish the communication processing system network by connecting further large number of communication processing systems with each other.
As set forth above, upon incorporating a plurality of mutually different network interfaces in one communication processing apparatus, hardware of different functions and software corresponding thereto become necessary. Thus, complexity of the overall system tends to be increased. In contrast to this, by the shown system, the hardware and software which have been separately designed per network interface in the past, can be simplified by unifying to the fixed length buffer interface via the memory.
As set forth above, the present invention does not require to provide hardware having different functions and software corresponding to such hardware, and thus complexity of the overall system will never be increased by dividing the data received from mutually different kinds of networks, transmits to the superior unit with adding identification information identifying the network through which data is received, and performs the process in the superior unit depending upon the content of the identification information.
Although the present invention has been illustrated and described with respect to exemplary embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omission and additions may be made therein and thereto, without departing from the spirit and scope of the present invention. Therefore, the present invention should not be understood as limited to the specific embodiment set out above but to include all possible embodiments which can be embodied within a scope encompassed and equivalent thereof with respect to the feature set out in the appended claims.
Although the present invention has been illustrated and described with respect to exemplary embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omission and additions may be made therein and thereto, without departing from the spirit and scope of the present invention. Therefore, the present invention should not be understood as limited to the specific embodiment set out above but to include all possible embodiments which can be embodied within a scope encompassed and equivalent thereof with respect to the feature set out in the appended claims.
Claims (30)
1. A communication processing apparatus comprising:
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from said reception data among said plurality of kinds of networks to data divided by said data dividing means to establish a fixed length data, for transmitting said fixed length data added said identification information to a superior unit.
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from said reception data among said plurality of kinds of networks to data divided by said data dividing means to establish a fixed length data, for transmitting said fixed length data added said identification information to a superior unit.
2. A communication processing apparatus as set forth in claim 1, which includes a memory storing the fixed length data added said identification information to transmit said fixed length data to said superior unit via said memory.
3. A communication processing apparatus as set forth in claim 2, wherein said memory is provided in common for said plurality of kinds of networks.
4. A communication processing apparatus as set forth in claim 2, wherein said memory is written said fixed length data by said identification information adding means and reading out said fixed length data by said superior unit.
5. A communication processing apparatus as set forth in claim 2, wherein said memory is written and read in and from said fixed length data by said superior unit.
6. A communication processing apparatus as set forth in claim 1, wherein said fixed length data includes a pointer pointing a next data following own data.
7. A communication processing apparatus as set forth in claim 1 wherein all of said plurality of networks are networks transmitting digital data.
8. A communication processing apparatus as set forth in claim 7, wherein one of said plurality of kinds of networks is a network of Ethernet.
9. A communication processing apparatus as set forth in claim 7, wherein one of said plurality of kinds of networks is a network operating under point-to-point protocol.
10. A communication processing apparatus as set forth in claim 7, wherein one of said plurality of kinds of networks us a network operating at asynchronous transmission mode.
11. A superior unit connected to a communication processing apparatus transmitting a received data in a form of a fixed length data added an identification information identifying a network, through which said received data is received, comprising:
data reading means for reading out said fixed length data from a memory storing said fixed length data; and data processing means for performing process corresponding to identification information added to said fixed length data read out from said memory for said data.
data reading means for reading out said fixed length data from a memory storing said fixed length data; and data processing means for performing process corresponding to identification information added to said fixed length data read out from said memory for said data.
12. A superior unit as set forth in claim 11, wherein said fixed length data includes a pointer pointing a next data following a own data, and said data reading means sequentially reading out the fixed length data on the basis of said pointer.
13. A superior unit as set forth in claim 12, wherein said data processing means deletes said identification information and said pointer from said fixed length data and said received data is restored and regenerated by connecting data on the basis of said pointer.
14. A communication processing system comprising:
communication processing apparatus including:
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from said reception data among said plurality of kinds of networks to data divided by said data dividing means to establish a fixed length data, for transmitting said fixed length data added said identification information to a superior unit;
a superior unit including:
data reading means for reading out said fixed length data from a memory storing said fixed length data; and data processing means for performing process corresponding to identification information added to said fixed length data read out from said memory for said data.
communication processing apparatus including:
data dividing means for dividing reception data received from one of a plurality of mutually different networks into a predetermined length of data;
identification information adding means for adding an identification information for identifying the network received from said reception data among said plurality of kinds of networks to data divided by said data dividing means to establish a fixed length data, for transmitting said fixed length data added said identification information to a superior unit;
a superior unit including:
data reading means for reading out said fixed length data from a memory storing said fixed length data; and data processing means for performing process corresponding to identification information added to said fixed length data read out from said memory for said data.
15. A communication processing system as set forth in claim 14, which includes a memory storing the fixed length data added said identification information to transmit said fixed length data to said superior unit via said memory.
16. A communication processing system as set forth in claim 15, wherein said memory is provided in common for said plurality of kinds of networks.
17. A communication processing system as set forth in claim 15, wherein said memory is written said fixed length data by said identification information adding means and reading out said fixed length data by said superior unit.
18. A communication processing system as set forth in claim 15, wherein said memory is written and read in and from said fixed length data by said superior unit.
19. A communication processing system as set forth in claim 14, wherein said fixed length data includes a pointer pointing a next data following a own data, and said reading means sequentially reading out the fixed length data on the basis of said pointer.
20. A communication processing system as set forth in claim 14 wherein all of said plurality of networks are networks transmitting digital data.
21. A communication processing system as set forth in claim 20, wherein one of said plurality of kinds of networks is a network of Ethernet.
22. A communication processing system as set forth in claim 20, wherein one of said plurality of kinds of networks is a network operating under point-to-point protocol.
23. A communication processing system as set forth in claim 20, wherein one of said plurality of kinds of networks us a network operating at asynchronous transmission mode.
24. A communication processing system network comprising:
a plurality of communication processing systems defined in claim 14;
a common network provided commonly to said plurality of communication processing systems, for mutually exchanging a fixed length data between said plurality of communication processing systems via said common network.
a plurality of communication processing systems defined in claim 14;
a common network provided commonly to said plurality of communication processing systems, for mutually exchanging a fixed length data between said plurality of communication processing systems via said common network.
25. A communication processing method comprising the steps of:
a step of dividing a received data received from one of a plurality of mutually different kinds of networks into a predetermined length of data;
a step of reading out said received data in a predetermined data amount and adding identification information identifying the network, through which said received data is received, for establishing a fixed length data;
and a step of transmitting said fixed length data added said identification information to a superior unit.
a step of dividing a received data received from one of a plurality of mutually different kinds of networks into a predetermined length of data;
a step of reading out said received data in a predetermined data amount and adding identification information identifying the network, through which said received data is received, for establishing a fixed length data;
and a step of transmitting said fixed length data added said identification information to a superior unit.
26. A common processing method as set forth in claim 25, wherein said superior unit performs process corresponding to the identification information added to said fixed length data for said data.
27. A communication method as set forth in claim 25, wherein all of a plurality of kinds of networks are networks transmitting digital data.
28. A communication processing method as set forth in claim 27, wherein one of said plurality of kinds of networks is a network of Ethernet.
29. A communication processing method as set forth in claim 27, wherein one of said plurality of kinds of networks is a network operating under point-to-point protocol.
30. A communication processing method as set forth in claim 27, wherein one of said plurality of kinds of networks us a network operating at asynchronous transmission mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP592499A JP3339442B2 (en) | 1999-01-13 | 1999-01-13 | Communication processing system network |
| JP11-005924 | 1999-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2295279A1 true CA2295279A1 (en) | 2000-07-13 |
Family
ID=11624455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2295279 Abandoned CA2295279A1 (en) | 1999-01-13 | 2000-01-12 | Communication processing apparatus, superior system thereof, communication processing system, communication processing system network and communication processing process |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3339442B2 (en) |
| CA (1) | CA2295279A1 (en) |
| DE (1) | DE10000965A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4888099B2 (en) * | 2006-12-13 | 2012-02-29 | 富士ゼロックス株式会社 | Network control apparatus and control method thereof |
-
1999
- 1999-01-13 JP JP592499A patent/JP3339442B2/en not_active Expired - Fee Related
-
2000
- 2000-01-12 DE DE2000100965 patent/DE10000965A1/en not_active Withdrawn
- 2000-01-12 CA CA 2295279 patent/CA2295279A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE10000965A1 (en) | 2000-07-27 |
| JP2000209252A (en) | 2000-07-28 |
| JP3339442B2 (en) | 2002-10-28 |
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