CN113890680A - Transmission method applied to fiber channel avionics network DDS - Google Patents
Transmission method applied to fiber channel avionics network DDS Download PDFInfo
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- CN113890680A CN113890680A CN202111137656.4A CN202111137656A CN113890680A CN 113890680 A CN113890680 A CN 113890680A CN 202111137656 A CN202111137656 A CN 202111137656A CN 113890680 A CN113890680 A CN 113890680A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 239000000835 fiber Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005538 encapsulation Methods 0.000 claims abstract description 11
- 230000006854 communication Effects 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000004806 packaging method and process Methods 0.000 claims abstract description 7
- 238000013507 mapping Methods 0.000 claims abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000000470 constituent Substances 0.000 description 14
- 230000014509 gene expression Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 208000025697 familial rhabdoid tumor Diseases 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4645—Details on frame tagging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/164—Adaptation or special uses of UDP protocol
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2212/00—Encapsulation of packets
Abstract
The invention discloses a fiber channel network transmission method applied to a avionics network DDS, relates to a network communication technology, and solves the problem of excessive resource cost when an Ethernet DDS system is transplanted to an FC network. The invention comprises the following steps: packaging data output by accessing one DDS terminal by adopting an ASM/ELS format in an FC network, carrying out routing and flow control through the FC network, and transmitting the data to another DDS terminal for de-packaging into Ethernet data; the encapsulation is to generate an FC frame header and an ASM frame header for ethernet data sent by the DDS according to configuration information such as an FC address mapping table, and the data content is encapsulated as an ASM frame payload or an FC frame payload. The invention reduces the cost of transplanting the DDS system based on the Ethernet to the FC network.
Description
Technical Field
The invention relates to a network communication technology, in particular to a transmission method applied to a fiber channel avionics network DDS.
Background
The existing DDS communication in an avionics network is mainly classified into two types: (1) based on the Ethernet, the technical scheme is the most mature, and gigabit Ethernet is adopted to transmit DDS data; (2) based on the FC network, since the new generation avionics system basically adopts the FC network, the DDS system based on the ethernet needs to be migrated to the FC network.
The drawbacks of these two algorithms: the initial DDS design is based on ethernet and RTPS protocols, but a new generation avionics system basically adopts an FC network, and the DDS system based on ethernet is transplanted onto the FC network, and besides modifying an underlying communication interface, some attributes depending on ethernet characteristics need to be modified, for example, a domain number in the RTPS protocol is generally obtained by UDP port mapping, and after being transplanted onto the FC network, since the FC frame has no port number, the domain number can only be transmitted by defining another extra message ID.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a fiber channel network transmission method applied to a avionics network DDS, which solves the problem of overlarge resource cost when an Ethernet DDS system is transplanted to an FC network.
The invention is realized by the following technical scheme:
a transmission method applied to a fiber channel avionics network DDS comprises the following steps:
packaging data output by accessing one DDS terminal by adopting an ASM/ELS format in an FC network, carrying out routing and flow control through the FC network, and transmitting the data to another DDS terminal for de-packaging into Ethernet data;
the encapsulation is to generate an FC frame header and an ASM frame header for ethernet data sent by the DDS according to configuration information such as an FC address mapping table, and the data content is encapsulated as an ASM frame payload or an FC frame payload.
The transmission method can directly encapsulate non-subject data into ELS frames, encapsulate subject data contents into ASM frames according to the corresponding relation between a subject task and MSGID, transmit the ASM frames to the FC network, perform routing and flow control by using the characteristics of the FC network, decapsulate the ASM data and the ELS data into Ethernet DDS subject data or other data respectively after the data reaches other DDS terminals, and upload the Ethernet DDS subject data or other data to a DDS application layer; the original Ethernet DDS application layer is not changed by the transmission method, and the characteristics of the FC network are fully utilized.
Further, the DDS sends ethernet data to the protocol stack, and accesses the fiber channel network transmission device through the protocol stack to perform encapsulation.
Further, the encapsulated data is transmitted through the FC network, decapsulated and uploaded to the protocol stack, and the other DDS terminal receives the decapsulated ethernet data through the protocol stack.
Further, an interface for receiving the call of the protocol stack by the upper application of the DDS is an ethernet Socket interface.
Furthermore, the interface of the data output to the protocol stack after being encapsulated by the fiber channel network transmission device or the interface of the data input to the fiber channel network transmission device for decapsulating adopts an SFP interface to transmit FC data.
Further, specifically, the subject data in the DDS is framed in an ASM format, and other communication data is framed in an ELS format.
Further, the non-subject data in the DDS is encapsulated in an ELS format.
Further, the FC address also includes a Port ID corresponding to the IP address for communication between devices corresponding to the encapsulation operation.
The invention has the following advantages and beneficial effects:
1. the invention fully utilizes the characteristics of the FC network to reduce the resource occupation and the modification of the DDS application layer;
2. the invention reduces the cost of transplanting the DDS system based on the Ethernet to the FC network.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of data encapsulation/decapsulation according to the present invention.
Fig. 2 is a data routing diagram of a hardware module in the fibre channel network of the present invention.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1: a fiber channel network transmission method applied to a avionics network DDS comprises the following steps:
the data output by one DDS terminal is encapsulated by ASM/ELS data in an FC network, and is routed and controlled by the FC network, and is transmitted to another DDS terminal to be de-encapsulated into Ethernet data;
the encapsulation is to generate an FC frame header and an ASM frame header for ethernet data sent by the DDS according to configuration information such as an FC address mapping table, and the data content is encapsulated as an ASM frame payload or an FC frame payload.
The DDS sends Ethernet data to a protocol stack, and the Ethernet data is accessed to a fiber channel network transmission device through the protocol stack and then packaged.
And the encapsulated data is transmitted through the FC network, decapsulated and uploaded to the protocol stack, and the other DDS terminal receives the decapsulated Ethernet data through the protocol stack.
And an interface for receiving the call of the protocol stack by the upper application of the DDS is an Ethernet Socket interface.
The interface of the data output to the protocol stack after being encapsulated by the optical fiber channel network transmission device or the interface of the data input to the optical fiber channel network transmission device for decapsulating adopts an SFP interface to transmit FC data.
Specifically, the subject data in the DDS is framed in an ASM format, and other communication data is framed in an ELS format.
And packaging the non-theme data in the DDS by adopting an ELS format.
The FC address also includes a Port ID corresponding to the IP address for communication between devices corresponding to the encapsulation operation.
Example 2:
based on embodiment 1, as shown in fig. 1, in the DDS terminal, the data content of the network structure layer from the application layer to the FC interface layer includes the following:
the application layer directly transmits DDS data, the transmission layer transmits UDP headers and DDS data, the network layer transmits IP headers, UDP headers and DDS data, wherein the IP headers include but are not limited to version information, service types, data packets and identifications, survival time, protocol types, verification and source/target IP, and the UDP headers include source/destination ports, user data packet lengths, check or checksum 16 bits; the network interface layer transmits an MAC (media access control) head, an IP (Internet protocol) head, a UDP (user Datagram protocol) head and DDS (direct data synthesizer) data, the FC interface layer transmits an FC head, an ASM (asynchronous serial bus) head, an MAC head, an IP head, a UDP head and DDS (direct data synthesizer) data, and the FC head, the MAC head, the IP head, the UDP head and the DDS other data;
as shown in fig. 2, in this embodiment, an SFP optical module interface is adopted, Tx represents a receiving port, Rx identifies a transmitting port, and is accessed to a GTX IP core, that is, a graphics card core, through multiple operations of word synchronization, link establishment, FC frame reception, and reception scheduling, a frame reception FIFP is connected to an ethernet, and is connected to an ethernet Over FC state machine, where CFG represents a data structure of the ethernet, the ethernet Over FC state machine is connected to a DDS application, and the ethernet Over FC state machine transmits/receives FC frame data in an FC network, and then transmits and schedules the FC frame data to the graphics card IP core, and the SFP interface is connected to a device where encapsulation/decapsulation is located through an optical fiber.
In this embodiment, the DDS application interacts with a protocol stack of a network, and realizes bidirectional interaction with a configuration management program of the DDS terminal through a network device driver and an FC processing module, the configuration management program of the DDS terminal communicates with the network device driver through an IOCTL interface, and the network device drives an FC node physical device of a bidirectional communication physical layer.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A transmission method applied to a fiber channel avionics network DDS is characterized by comprising the following steps:
packaging data output by accessing one DDS terminal by adopting an ASM/ELS format in an FC network, carrying out routing and flow control through the FC network, and transmitting the data to another DDS terminal for de-packaging into Ethernet data;
the encapsulation is to generate an FC frame header and an ASM frame header for ethernet data sent by the DDS according to configuration information such as an FC address mapping table, and the data content is encapsulated as an ASM frame payload or an FC frame payload.
2. The transmission method of the DDS applied to fiber channel avionics network as claimed in claim 1, wherein the DDS sends ethernet data to a protocol stack, and accesses the fiber channel network transmission device through the protocol stack for encapsulation.
3. The transmission method applied to the fiber channel avionics network DDS as claimed in claim 2, wherein the encapsulated data is transmitted through the FC network, decapsulated and uploaded to a protocol stack, and another DDS terminal receives the decapsulated Ethernet data through the protocol stack.
4. The transmission method applied to a fiber channel avionics network DDS as claimed in claim 3, wherein an interface for receiving the call of the protocol stack by the upper application of the DDS is an Ethernet Socket interface.
5. The DDS transmission method as in claim 4, wherein the data output to the protocol stack is transmitted FC data through SFP interface at the interface of the fiber channel network transmission device after encapsulation or the interface of the fiber channel network transmission device for decapsulating data.
6. The transmission method applied to a fiber channel avionics network DDS as claimed in claim 1, wherein the subject data in the DDS is specifically unframed in an ASM format, and other communication data is unframed in an ELS format.
7. The transmission method for a fiber channel avionics network DDS as recited in claim 1, wherein the non-subject data in the DDS is encapsulated in ELS format.
8. The DDS transmission method as recited in claim 1, wherein the FC address further includes a Port ID corresponding to the IP address, which is used for encapsulating communication between devices.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111137656.4A CN113890680A (en) | 2021-09-27 | 2021-09-27 | Transmission method applied to fiber channel avionics network DDS |
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| CN202111137656.4A CN113890680A (en) | 2021-09-27 | 2021-09-27 | Transmission method applied to fiber channel avionics network DDS |
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Application publication date: 20220104 |