JP6509474B2 - Gateway apparatus, priority changing method and priority changing program - Google Patents

Description

  The present invention relates to a gateway apparatus, a priority change method, and a priority change program for receiving and processing a frame.

  In the conventional communication gateway device on Ethernet (registered trademark), in order to maintain the quality of service (QoS) of the entire network, the network quality is secured as a whole network by using a protocol for QoS between network devices. doing. For example, Patent Document 1 describes a method of securing a QoS while giving the type of QoS to a frame and checking whether or not QoS transmission is possible between a master station and a slave station.

WO 2008/004592 pamphlet

However, in recent years, gateway devices capable of integrally managing and controlling control protocols such as BAC-net and general protocols such as TCP / IP are increasing. In such a device, it is necessary to process the control protocol with priority, but due to the complexity of processing of the TCP / IP protocol, a large amount of CPU resources and memory are consumed, and processing of the control protocol is delayed. there were.
For example, when an upper-level station of the gateway apparatus instructs the lower-level station to give an emergency stop via the control protocol, if the gateway apparatus is already processing a complex general protocol of processing, There is a problem that the communication transfer process of the protocol can not be performed and the process of the emergency stop is delayed.

  An object of the present invention is to enable specific protocol processing to be preferentially implemented by dynamically changing a resource for application processing in a gateway apparatus according to the content of a frame received by a control protocol. .

The gateway device of the present invention is
A storage unit that stores frame information in which a protocol type indicating a type of protocol used for frame communication and a frame pattern indicating a feature of the frame are associated;
Receive a frame via a receiver and detect the protocol type of the received frame;
A reception control unit that determines whether the detected protocol type is registered in the frame information;
If it is determined by the reception control unit that the protocol type is registered in the frame information, the content of the frame in which the protocol type is detected in the frame pattern corresponding to the registered protocol type And a priority change unit that raises the priority of the process of the protocol type determined to be registered in the frame information according to the determination result.

  According to the present invention, it is possible to provide a gateway apparatus capable of preferentially performing specific protocol processing in accordance with the contents of a frame received by a control protocol.

FIG. 2 is a diagram of the first embodiment and is a hardware configuration diagram of the gateway device 1-1. FIG. 2 is a diagram of the first embodiment and shows functional elements implemented by the processor 10. FIG. 8 is a diagram of the first embodiment and is a diagram showing a resource management table 21-1. FIG. 9 is a diagram of the first embodiment and is a flowchart when starting up the gateway device 1-1. FIG. 7 is a diagram of the first embodiment and is a flowchart showing processing when the gateway device 1-1 receives a frame. FIG. 8 is a diagram of the first embodiment and shows a modified example of the gateway device 1-1. FIG. 17 is a diagram of the second embodiment and shows functional elements of the gateway device 1-2. FIG. 17 is a diagram of the second embodiment and is a diagram showing a memory 20 of the gateway device 1-2. The figure of Embodiment 2 WHEREIN: The flowchart which shows the method of accumulate | storing several frames of a steady state as a log. The figure of Embodiment 2 which is a flowchart of processing after accumulating a frame in a steady state as a log. FIG. 18 is a diagram of the second embodiment and is a diagram showing a resource management table 21-2. FIG. 16 is a diagram of the second embodiment, which is a flowchart showing processing after setting of the resource management table 21-2. FIG. The figure of Embodiment 3, and a flow chart which shows processing after acquisition of an abnormal condition log. FIG. 18 is a diagram of the third embodiment and is a diagram showing a resource management table 21-3. FIG. 18 is a diagram of the third embodiment and is a flowchart showing processing after setting in the resource management table 21-3; FIG.

Embodiment 1
*** Description of the configuration ***
FIG. 1 is a hardware configuration diagram of the gateway device 1-1 according to the first embodiment which is an embedded device. In FIG. 1, the gateway device 1-1 transmits and receives frames by software.

  The gateway device 1-1 is a computer. The gateway device 1-1 includes a processor 10, a memory 20, a secondary storage device 30, an input device 40, an output device 50, a receiving NIC (Network Interface Controller) 60, and a transmitting NIC 70. The processor 10 is connected to other hardware via a signal line 90 to control these other hardware.

  The processor 10 is an IC (Integrated Circuit) that performs arithmetic processing. As a specific example, the processor 10 is a central processing unit (CPU), a digital signal processor (DSP), or a graphics processing unit (GPU).

  The memory 20 holds the execution code and execution data of the program. Further, in the memory 20 which is the storage unit 920, a resource management table 21-1 which is frame information 921-1 is stored. The memory 20 is a readable and writable storage device. Specific examples of the memory 20 include static random access memory (SRAM) and dynamic random access memory (DRAM).

  The secondary storage device 30 is a readable and writable non-volatile storage device. The secondary storage device 30 stores a program. The programs stored in the secondary storage device 30 are expanded in the memory 20 as needed, such as when the hardware is started. The secondary storage device 30 stores a program for realizing the function of the gateway device 1-1 and other data. As a specific example, the secondary storage device 30 is a magnetic disk device. Further, the secondary storage device 30 may be a storage device using a portable storage medium such as an optical disk, a compact disk, a Blu-ray (registered trademark) disk, and a DVD (Digital Versatile Disk).

  The input device 40 notifies the processor 10 of the input state in response to the input operation from the user. The output device 50 outputs a notification to the user such as an indication of an LED according to an instruction of the processor 10.

  The receiving NIC 60 receives the frame from the upper station and notifies the processor 10 of the frame. The transmission NIC 70 transmits a frame to a lower station at the instruction of the processor 10. The reception NIC 60 is a reception device 960.

FIG. 2 shows functional elements implemented by the processor 10. The gateway apparatus 1-1 includes, as functional elements, a first protocol processor 11, a second protocol processor 12, a second protocol frame pattern interpreter 13, a second protocol resource changer 14, a frame receiver 15, and user instruction management. The unit 16 is provided.
(1) The first protocol processor 11 processes the protocol 1. Protocol 1 is hereinafter referred to as a first protocol. The first protocol assumes the TCP / IP protocol. The first protocol processing unit 11 performs application processing in accordance with the contents of the frame of the first protocol. For example, the first protocol processing unit 11 performs processing on an application built on the TCP / IP protocol. The content of the process is transmission of a frame via the transmission NIC 70 or operation of the input device 40 and the output device 50.
(2) The second protocol processor 12 processes the protocol 2. Protocol 2 is hereinafter referred to as a second protocol. The second protocol assumes a control protocol. The second protocol processor 12 performs application processing in accordance with the contents of the frame of the second protocol. For example, the second protocol processing unit 12 processes an application built on a control protocol such as the BAC-net protocol.
(3) Second Protocol The frame pattern interpretation unit 13 interprets the frame pattern of the second protocol. The second protocol frame pattern interpretation unit 13 is hereinafter referred to as an interpretation unit 13.
(4) The second protocol resource change unit 14 changes the resources allocated to the second protocol. The second protocol resource change unit 14 is hereinafter referred to as the change unit 14.
(5) The frame reception unit 15 receives a frame via the reception NIC 60.
(6) The user instruction management unit 16 processes the information input from the user by the input device 40. The user instruction management unit 16 is hereinafter referred to as the management unit 16.
(7) The interpreting unit 13 and the changing unit 14 constitute a priority changing unit 913. Further, the frame reception unit 15 is a reception control unit 915.

  The functions of the first protocol processor 11, the second protocol processor 12, the interpreter 13, the changer 14, the frame receiver 15, and the manager 16 are implemented by software. The secondary storage device 30 stores programs for realizing the functions of the first protocol processor 11, the second protocol processor 12, the interpreter 13, the changer 14, the frame receiver 15 and the manager 16. This program is read and executed by the processor 10. Thus, the functions of the first protocol processor 11, the second protocol processor 12, the interpreter 13, the changer 14, the frame receiver 15, and the manager 16 are realized. Specifically, the first protocol processor 11, the second protocol processor 12, the interpreter 13, the changer 14, the frame receiver 15, and the manager 16 shown in FIG. Unfolded.

  In FIG. 1, only one processor 10 is shown. However, the gateway device 1-1 may include a plurality of processors that replace the processor 10. The plurality of processors share execution of programs of the first protocol processor 11, the second protocol processor 12, the interpreter 13, the changer 14, the frame receiver 15, and the manager 16. Each processor is an IC that performs arithmetic processing in the same manner as the processor 10.

  FIG. 3 is a diagram showing the resource management table 21-1. In the resource management table 21-1, the protocol type 21a, the frame pattern 21b, and the resource state 21c input by the user are registered. In the resource management table 21-1, a protocol type 21a indicating the type of protocol used for communication of a frame, a frame pattern 21b indicating a feature of the frame, and a resource state 21c are associated. FIG. 3 shows a state in which the record 21 d is registered.

*** Description of operation ***
FIG. 4 is a flowchart of activation of the gateway device 1-1. FIG. 4 shows a process in which the record 21 d is registered. The operation at startup of the gateway device 1-1 will be described with reference to FIG.
In step S11, the management unit 16 registers information input by the user via the input device 40 in the resource management table 21-1. The information input by the user via the input device 40 is a protocol type 21a, a frame pattern 21b, and a resource state 21c as a resource change value.
In step S12, the management unit 16 registers the content input from the user as the record 21d in the resource management table 21-1 and stores it.

FIG. 5 is a flowchart showing processing when the gateway device 1-1 receives a frame of contents registered in the resource management table 21-1. A process when a frame registered in the resource management table 21-1 is received while the first protocol processing unit 11 is executing frame processing of the first protocol will be described with reference to FIG.
In step S21, the reception control unit 915 receives a frame via the reception device 960, and detects the protocol type of the received frame. Specifically, the frame reception unit 15 receives a frame while the first protocol processing unit 11 is executing frame processing of the first protocol. In this example, the frame reception unit 15 receives a frame of the second protocol.
In step S22, the frame reception unit 15 detects the protocol type of the frame. In this case, the second protocol is detected.

In step S23, the frame reception unit 15 which is the reception control unit 915 determines whether the detected protocol type is registered in the resource management table 21-1 which is the frame information 921-1. Since the resource management table 21-1 is in the state of FIG. 3, the frame reception unit 15 determines that the second protocol is registered in the resource management table 21-1.
In step S24, the frame reception unit 15 sends the received frame to the interpretation unit 13.

In step S25, when the reception control unit 915 determines that the protocol type is registered in the frame information 921-1, the priority change unit 913 changes the frame pattern 21b corresponding to the registered protocol type 21a. Then, it is determined whether the content of the frame in which the protocol type is detected matches. The interpretation unit 13 determines whether the content of the frame received from the frame reception unit 15 matches the frame pattern 21b registered in the resource management table 21-1. In this case, the interpretation unit 13 determines whether the received frame includes an emergency stop flag. In this example, the interpretation unit 13 determines that the frame contents of the frame pattern 21b of the record 21d registered in the resource management table 21-1 coincide with each other. That is, in this example, the received frame includes an emergency stop flag.
In step S26, the interpretation unit 13 calls the change unit 14. The interpreting unit 13 instructs the changing unit 14 to change the resource state of the second protocol processing unit 12 to the contents of the resource state 21c of the record 21d of the resource management table 21-1.

In step S27, the changing unit 14 changes the second protocol processing unit 12 to the resource state 21c of the record 21d of the resource management table 21-1. That is, the changing unit 14 which is the priority changing unit 913 raises the priority of the process of the protocol type 21 a determined to be registered in the frame information 921-1.
In step S28, when the operating system (OS) scheduler operates, the scheduler operates the second protocol processor 12 prior to other protocol processors according to the change performed in step S27. In the case of YES in step S25, and in the case of processing that flows in step S26 and step S27, the priority changing unit 913 determines that the frame information 921 matches the content of the frame in which the protocol type is detected. Raise the priority of the process of the protocol type 21a determined to be registered in -1.

  If the detected protocol type is not the second protocol (NO in step S23), or if NO in step S25, the first protocol processing unit 11 continues the operation in step S29.

*** Effect of Embodiment 1 ***
The gateway device 1-1 changes the priority of the protocol to be processed according to the content of the received frame, so that it is possible to preferentially implement the processing of the specific protocol. Although the priority of the processing of the second protocol has been raised in the above description, the present invention is not limited to this, and the second protocol may be stopped by stopping other high priority processing such as stopping the first protocol processing unit 11. The priority of the processing of may be relatively improved.

  Further, in the present example, the resource is changed when a single frame is received, but the priority may be changed when a plurality of frames arrive in a predetermined order. In this case, the interpretation unit 13 can save the reception history of a plurality of frames. The case where a plurality of frames are received will be described in Embodiment 2 and Embodiment 3.

*** Other configuration ***
<Modification 1>
In the first embodiment, the functions of the first protocol processor 11, the second protocol processor 12, the interpreter 13, the changer 14, the frame receiver 15, and the manager 16 are realized by software. However, as a first modification, the functions of the first protocol processor 11, the second protocol processor 12, the interpreter 13, the changer 14, the frame receiver 15, and the manager 16 may be realized by hardware. The differences between this first modification and the first embodiment will be described.

  FIG. 6 shows a modified example 1 of the gateway device 1-1. The configuration of the gateway device 1-1 according to the first modification will be described with reference to FIG. When the functions of the first protocol processing unit 11, the second protocol processing unit 12, the interpretation unit 13, the change unit 14, the frame reception unit 15, and the management unit 16 are realized by hardware, the gateway device 1-1 is a processor 10 And a processing circuit 80. The processing circuit 80 is a dedicated electronic circuit that implements the functions of the first protocol processing unit 11, the second protocol processing unit 12, the interpretation unit 13, the change unit 14, the frame reception unit 15, and the management unit 16.

  The processing circuit 80 is assumed to be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, a logic IC, a gate array (GA), an application specific integrated circuit (ASIC), and a field-programmable gate array (FPGA). Be done. The functions of the first protocol processing unit 11, the second protocol processing unit 12, the interpreting unit 13, the changing unit 14, the frame receiving unit 15, and the management unit 16 may be realized by one processing circuit 80, or the first protocol processing The functions of the unit 11, the second protocol processing unit 12, the interpretation unit 13, the change unit 14, the frame reception unit 15, and the management unit 16 may be distributed to a plurality of processing circuits.

<Modification 2>
As a second modification, some functions may be realized by hardware, and other functions may be realized by software. That is, some functions of the first protocol processing unit 11, the second protocol processing unit 12, the interpretation unit 13, the change unit 14, the frame reception unit 15, and the management unit 16 are realized by hardware, and other functions are realized. It may be realized by software.

  The processor 10 and the processing circuit 80 are collectively referred to as "processing circuitry". That is, the function of each functional component is realized by the processing circuit.

Second Embodiment
The gateway device 1-2 according to the second embodiment will be described with reference to FIGS.
FIG. 7 shows functional elements of the gateway device 1-2. 7, a frame storage unit 17 and a frame log interpretation unit 18 are added to FIG. The hardware configuration of the gateway device 1-2 is the same as that of FIG. When it is determined that one or more frames different from the steady state have been received, the gateway device 1-2 raises the priority of processing of a specific protocol based on the frame pattern of the steady state series of frames.

  The steady state assumed in the second embodiment is as follows. For example, it is assumed that the offset position of the frame is the third byte of the payload. In successive frames, it is assumed that the third byte becomes 0xf0, 0xf1, 0xf2, ..., 0xff, and becomes 0xf0 again. It is assumed that control communication is performed in these series of frames. In the steady state, as in this example, a certain frame always arrives after a certain frame. In the above example, in the steady state, the frame group of 0xf1, 0xf2, ..., 0xff has one cycle.

The frame storage unit 17 stores the frame sent from the frame reception unit 15 in the frame log storage area 22 when acquiring a plurality of frames described later with reference to FIG. The frame log storage area 22 exists, for example, in the memory 20.
FIG. 8 shows the memory 20 of the gateway device 1-2. The memory 20 has a resource management table 21-2 and a frame log storage area 22. Although the frame log storage area 22 is secured in the memory 20, it may be provided in the secondary storage device 30 or an external storage device such as an HDD or an SDD as an external storage device. The frame log storage area 22 stores the frame sent from the frame storage unit 17.

  The frame log interpretation unit 18 interprets the frame log in the steady state from the storage data of the frame log storage area 22 and registers the frame log in the resource management table 21-2 as the frame pattern in the normal state.

  FIG. 9 is a flowchart showing a method of accumulating a plurality of steady state frames as a log.

In step S31, when the gateway device 1-2 is activated, the frame reception unit 15 is set by the user to acquire a frame of the second protocol. Specifically, the user uses the input device 40 and sets the frame reception unit 15 to acquire the frame of the second protocol via the management unit 16.
In step S32, when a frame is received, the frame reception unit 15 determines the protocol type of the frame. If the protocol type detected by the frame reception unit 15 matches the second protocol, the process proceeds to step S33. If the protocol type does not match the second protocol, the process proceeds to step S35.
In step S33, in the case of the second protocol, the frame reception unit 15 passes the frame to the frame storage unit 17.

In step S34, the frame storage unit 17 stores the frame passed from the frame reception unit 15 in the frame log storage area 22.
In step S35, the frame reception unit 15 passes the frame to the corresponding protocol processing unit according to the protocol type. In this example, since the protocol type of the received frame is the second protocol, the frame reception unit 15 passes the frame to the second protocol processing unit 12.

FIG. 10 shows the process after accumulating the steady state frame as a log.
In step S41, the frame log interpretation unit 18 extracts frame patterns in the steady state from a plurality of frames in the steady state with the same protocol type stored in the frame log storage area 22. Since the frame log interpretation unit 18 is set with extraction conditions for extracting a steady state frame pattern, the frame log interpretation unit 18 can extract a steady state frame pattern. As an example of the extraction method, the frame log interpretation unit 18 uses a particular payload as a search key, and extracts a plurality of frames that match the search key. When a plurality of frames are extracted, frames in between are defined as a steady state received frame group. The interval is a plurality of frames between the first frame and the last frame of the same frame group in the time axis. As described in the definition of the steady state, assuming that the third byte of the payload is 0xf0, 0xf1, 0xf2, ..., 0xff, and control communication is performed in a series of frames that will be 0xf0 again, the third byte is 0xf0. There are 16 frames ranging from 0xff to 0xff. That is, it is specified in the frame log interpretation unit 18 that the third byte of the payload should extract frames of 0xf0, 0xf1, 0xf2,..., 0xff as extraction conditions. The frame pattern extraction condition extracted by the frame log interpretation unit 18 is that “the third byte of the payload is periodically continuous with 0xf0, 0xf1, 0xf2,..., 0xff”.

In step S42, the frame log interpretation unit 18 registers the extracted steady state frame pattern 21b in the resource management TBL 21-2.
FIG. 11 shows a resource management table 21-2. In the resource management table 21-2 which is the frame information 921-2, a group of a plurality of steady-state frames is associated with the protocol type 21a as the frame pattern 21b. In the example of FIG. 11, it is registered that “the third byte of the payload is periodically continuous with 0xf0, 0xf1, 0xf2,..., 0xff” as the frame pattern 21b. In addition, in the resource management TBL 21-2, as the resource state 21c, setting the process of the second protocol as the top priority is set. The setting of the resource state 21 c may be set by the user using the input device 40 via the management unit 16 or may be set by the frame log interpretation unit 18. Through the above processing, the frame pattern of the steady state frame group is registered in the resource management table 21-2.

  FIG. 12 is a flowchart showing processing after setting of the resource management table 21-2. Since the process of FIG. 12 is equivalent to the process described in FIG. 5, different parts will be described. In FIG. 12, step S24-1 is added. In step S24-1, the interpretation unit 13 accumulates the frame sent from the frame reception unit 15.

In step S25a, as a result of the determination by the reception control unit 915, the priority changing unit 913 determines that the same protocol type of a plurality of received frames of the same protocol type is registered in the frame information 921-2. It is determined whether a plurality of received frames of the same protocol type match a group of a plurality of frames indicated by the frame pattern 21b corresponding to the same protocol type 21a. If it is determined that the two do not match (NO in S25a), the priority changing unit 913 raises the priority of the process of the same protocol type 21a.
The interpretation unit 13 determines whether the series of frames accumulated in step S24-1 matches the frame pattern 21b of the record 21d in the resource management table 21-2. If it is determined that they do not match, the process proceeds to step S26. That is, if they do not match, the received frame is not a normal frame, and the process proceeds to step S26. If it is determined that they match, the process proceeds to step S29. If they match, the received frame is a frame in a normal state. The processing of the other steps is the same as in FIG.

*** Effect of Embodiment 2 ***
In the gateway device 1-2 according to the second embodiment, the frame log interpretation unit 18 registers the frame pattern in the resource management table 21-2, so that registration by the user is unnecessary.
Further, according to the gateway device 1-2, since the frame pattern of the series of frames is registered as the frame pattern 21b, it is determined whether the process of the specific protocol should be prioritized with respect to the case where the series of frames is received. it can.

  In the second embodiment, the frame log interpretation unit 18 is operated on the gateway device 1-2, but may be operated on another host machine. In addition, although a search using a certain frame as a key is performed in the above for extraction of the steady state of the frame log, extraction may be performed using another method using deep learning or the like.

Third Embodiment
The gateway device 1-3 of the third embodiment will be described with reference to FIGS. 13 to 15. The gateway device 1-3 raises the priority of the process of the specific protocol based on log information composed of a plurality of steady state frames immediately before the abnormal state from the steady state.

  An abnormal state frame is a frame whose content is different from that of the normal state frame. The frame in the normal state is a series of frames described in the second embodiment, in which the third byte of the payload changes from 0xf0 to 0xff and becomes 0xf0 again. In this case, the frame in the abnormal state is, for example, a series of frames in which the third byte of the payload has one cycle of 0xb1, 0xb2, and 0xb3.

  The gateway device 1-3 according to the third embodiment changes the priority of the protocol processing before receiving a high priority frame such as an emergency stop based on the reception tendency of the frame. Specifically, in the gateway device 1-3, the frame reception tendency is registered as a frame pattern 21b in a resource management table 21-3 described later. The frame reception tendency is a frame pattern 21b of a plurality of frames in a series of normal states immediately before the transition from the normal state to the abnormal state when the contents of the frame transition from the normal state to the abnormal state. When the gateway device 1-3 receives a plurality of frames matching the frame pattern 21b of the source management table 21-3, it predicts that a frame in an abnormal state is to be sent. In this case, the gateway device 1-3 raises the priority of processing of a specific protocol without waiting for reception of an abnormal state frame. By this, it is possible to raise in advance the processing priority of the protocol expected to be an abnormal state before the frame indicating the abnormal state to be preferentially processed arrives. This enables high-speed processing of highly urgent frames.

  The configuration of the gateway device 1-3 is the same as that of the gateway device 1-2 in FIG. 7. The hardware configuration of the gateway device 1-3 is the same as that shown in FIG. As described above, when the contents of the frame transition from the normal state to the abnormal state, as described above, the gateway device 1-3 acquires a plurality of frames in a series of normal states immediately before the transition from the normal state to the abnormal state. The acquisition method is the same as that of FIG. 9 of the second embodiment.

  The gateway apparatus 1-3 generates an abnormal state outside the gateway apparatus 1-3 in order to acquire a series of frames in the normal state immediately before the transition from the normal state to the abnormal state by the process shown in the flowchart of FIG. And causes the gateway device 1-3 to acquire a plurality of frames in an abnormal state as logs.

  FIG. 13 shows processing after acquisition of an abnormal state log. As a premise of FIG. 13, according to the acquisition method of FIG. 9, the gateway device 1-3 acquires both a normal state frame and an abnormal state frame. These frames are stored in the frame log storage area 22.

  In step S51, the frame log interpretation unit 18 extracts the frame pattern of the abnormal state from the frame pattern of the steady state and the plurality of frames of the abnormal state. Since the frame log interpretation unit 18 is set with extraction conditions for extracting the frame pattern of the abnormal state, the frame log interpretation unit 18 can extract the frame pattern of the abnormal state. For example, according to the above-mentioned example, the extraction condition is that “the third byte of the payload is periodically continuous with 0xb1, 0xb2, 0xb3”. The frame pattern of the abnormal state extracted by the frame log interpretation unit 18 is that “the third byte of the payload is periodically continuous with 0xb1, 0xb2, 0xb3”. The extraction method, for example, uses a particular payload as a search key, and searches for a frame that matches this key. If they match, the frames in between are taken as the received frame group in the abnormal state.

In step S52, the frame log interpretation unit 18 registers, in the resource management table 21-3, as the frame pattern 21b, the reception frame group in a normal state until immediately before reaching an abnormal state, and the protocol type 21a of the reception frame group.
FIG. 14 shows a resource management table 21-3 which is frame information 921-3 in this case. In the frame information 921-3, as the frame pattern 21b, a group of a plurality of steady state frames immediately before switching to a frame in an abnormal state is associated with the protocol type 21a. In FIG. 14, it is assumed that the frame pattern of the reception frame group in the normal state until immediately before reaching the abnormal state is the same as the frame pattern 21 b of the resource management table 21-2. The resource status 21c of the resource management table 21-3 is set to give priority to the processing of the second protocol. The setting of the resource state 21 c may be performed by the frame log interpretation unit 18 or may be performed by the user via the input device 40 and the management unit 16.

FIG. 15 is a flowchart showing processing after setting in the resource management table 21-3. FIG. 15 is the same as FIG. 12 of the second embodiment, but step S25a is step S25b. Step S25b is for referring to the resource management table 21-3. If it is determined in step S25 b that the two match, the process proceeds to step S26. If they match, the received frame is predicted to move from the normal state to the abnormal state, so the process proceeds to step S26. If it is determined that they do not match, the process proceeds to step S29.
In step S25b, as a result of the determination by the reception control unit 915, the priority changing unit 913 determines that the same protocol type of a plurality of received frames of the same protocol type is registered in the frame information 921-3. It is determined whether a plurality of received frames of the same protocol type match a group of a plurality of frames indicated by the frame pattern 21b corresponding to the protocol type 21a. If the priority changing unit 913 determines that they match (YES in step S25b), the priority changing unit 913 raises the priority of the process of the same protocol type 21a.

  By the above processing, by changing the priority of the protocol processing in advance before the priority frame such as the abnormal state frame arrives, the processing of the highly urgent frame can be performed at high speed.

  As mentioned above, although embodiment of this invention was described, you may combine and implement two or more among these embodiment. Alternatively, one of these embodiments may be partially implemented. Alternatively, two or more of these embodiments may be implemented in combination. The present invention is not limited to these embodiments, and various modifications can be made as needed.

  1-1, 1-2, 1-3 gateway apparatus, 10 processor, 11 first protocol processing unit, 12 second protocol processing unit, 13 interpretation unit, 14 changing unit, 15 frame reception unit, 16 management unit, 17 frame Storage unit, 18 frame log interpretation unit, 20 memories, 21-1, 21-2, 21-3 resource management table, 22 frame log storage areas, 30 secondary storage devices, 40 input devices, 50 output devices, 60 reception NICs , 70 transmission NIC, 915 reception control unit, 913 priority change unit, 920 storage unit, 921-1, 921-2, 921-3 frame information, 960 reception apparatus.

Claims (6)

A storage unit that stores frame information in which a protocol type indicating a type of protocol used for frame communication and a frame pattern indicating a feature of the frame are associated;
Receive a frame via a receiver and detect the protocol type of the received frame;
A reception control unit that determines whether the detected protocol type is registered in the frame information;
If it is determined by the reception control unit that the protocol type is registered in the frame information, the content of the frame in which the protocol type is detected in the frame pattern corresponding to the registered protocol type A gateway apparatus comprising: a priority change unit that determines whether the two match and that the priority of processing of the protocol type determined to be registered in the frame information is increased according to the determination result. The priority changing unit is
When it is determined that the content of the frame in which the protocol type is detected matches the frame pattern, the priority of processing of the protocol type determined to be registered in the frame information is raised. The gateway device described. The storage unit is
As the frame pattern of the frame information,
A group of multiple steady state frames is associated with the protocol type,
The priority changing unit is
In the case where the same protocol type of a plurality of received frames of the same protocol type is registered in the frame information as a result of the determination by the reception control unit, the frame pattern corresponding to the same protocol type It is determined whether the plurality of received frames of the same protocol type match the group of the plurality of frames shown, and if it is determined that they do not match, the priority of the process of the same protocol type The gateway apparatus according to claim 1, wherein The storage unit is
As the frame pattern of the frame information, a group of a plurality of steady state frames immediately before switching to an abnormal state frame is associated with the protocol type,
The priority changing unit is
In the case where the same protocol type of a plurality of received frames of the same protocol type is registered in the frame information as a result of the determination by the reception control unit, the frame pattern corresponding to the same protocol type It is determined whether the plurality of received frames of the same protocol type match the group of the plurality of frames shown, and if it is determined that they match, priority of processing of the same protocol type is determined. The gateway apparatus according to claim 1, wherein The computer is
Storing, in a storage unit, frame information in which a protocol type indicating a type of protocol used for frame communication and a frame pattern indicating a feature of the frame are associated;
Receiving a frame via a receiving device, detecting a protocol type of the received frame, and determining whether the detected protocol type is registered in the frame information;
If it is determined that the protocol type is registered in the frame information, whether the content of the frame in which the protocol type is detected matches the frame pattern corresponding to the registered protocol type To determine the priority of processing of the protocol type determined to be registered in the frame information according to the determination result.
Priority change method. On the computer
A storage process for storing, in a storage unit, frame information in which a protocol type indicating a type of protocol used for frame communication and a frame pattern indicating a feature of the frame are associated;
A reception control process of receiving a frame via a receiving device, detecting a protocol type of the received frame, and determining whether the detected protocol type is registered in the frame information;
When it is determined by the reception control process that the protocol type is registered in the frame information, the content of the frame in which the protocol type is detected in the frame pattern corresponding to the registered protocol type A priority change process that determines whether or not the two match, and raises the priority of the process of the protocol type determined to be registered in the frame information according to the determination result;
Priority change program to execute.

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