CN109951458B

CN109951458B - RapidIO/FC protocol conversion system and method applied to simulation ICP environment

Info

Publication number: CN109951458B
Application number: CN201910162481.9A
Authority: CN
Inventors: 解军; 张敏
Original assignee: Chengdu Uestc Optical Communication Co ltd
Current assignee: Chengdu Uestc Optical Communication Co ltd
Priority date: 2019-03-05
Filing date: 2019-03-05
Publication date: 2021-10-08
Anticipated expiration: 2039-03-05
Also published as: CN109951458A

Abstract

The invention discloses a RapidIO/FC protocol conversion system and method applied to a simulated ICP environment, wherein the conversion system comprises: the RapidIO switching module comprises an application layer, an adaptation layer and a driving layer from top to bottom, the transfer node module comprises an upper layer and a bottom layer, the upper layer comprises an FC application layer and a RapidIO application layer, the bottom layer also comprises the adaptation layer, and the FC driving layer and the RapidIO driving layer. In addition, the conversion method comprises the following steps: in the simulated ICP, information interaction is carried out between the internal modules through a RapidIO exchange module; and between the inside and the outside of the simulated ICP, the internal module sequentially passes through the RapidIO exchange module and the transit node module and then performs information interaction with the external module. The real ICP adopts an expensive FC protocol technology, and in the simulation ICP system, the protocol conversion is realized through the invention, and on the premise of ensuring that an external hardware interface (FC) of the simulation ICP system is consistent with the real ICP system, the FC protocol can be replaced by a commercial mature RapidIO protocol, so that the cost is greatly saved.

Description

RapidIO/FC protocol conversion system and method applied to simulation ICP environment

Technical Field

The invention relates to the technical field of communication, in particular to a RapidIO/FC protocol conversion system and method applied to an ICP environment simulation.

Background

The avionic network equipment is composed of ICP (Integrated Core Processor) racks and peripheral functional components, interconnected by high-speed FC (Fibre Channel) network technology. The avionic network system consists of an ICP rack and functional components, the functional components can be divided into ICP rack internal equipment and ICP rack external equipment, and a typical avionic network structure is shown in figure 1.

In a real onboard network, message communication between any two modules must be forwarded through the FC switch, and the two functional modules communicate in a system as shown in fig. 2. In fig. 2, if module a is to be in message communication with module B, the data flow is as follows: the application layer of module a generates application messages and then invokes services provided by the network layer to pass the messages to the network layer. After receiving the application message, the network layer encapsulates the message and adds the network head and tail. After the network layer encapsulates the message, the network packet is delivered to the link layer (which is the FC protocol). The link layer encapsulates the network packet again, adds SOF, FC header, CRC and EOF, and then transfers the data to the physical layer. The FC switch implements a function to perform switching of FC frames. The minimum exchange granularity is an FC frame, and the FC switch only identifies the FC frame header and does not analyze the payload. At the receiving end of module B, the reverse operation is performed. And sequentially performing connection and encapsulation on the FC frames, and finally transmitting the application data to an application layer.

However, FC network technology is costly. To save costs, real ICP is often replaced in a laboratory environment with simulated ICP, which is shown in fig. 3, and high speed FC networks are replaced with commercial RapidIO networks. However, in order to keep the simulated environment as consistent as possible with the real environment, the ICP is simulated while the FC interface needs to be provided to the periphery. Thus, in a simulated ICP environment, two different networks exist. In order to realize the intercommunication of the two protocols, a protocol conversion module needs to be designed.

Disclosure of Invention

In order to solve the problems, the invention provides a RapidIO/FC protocol conversion system and method applied to an ICP environment simulation. Specifically, a RapidIO/FC protocol conversion system applied to a simulated ICP environment includes: the RapidIO switching module is connected with the RapidIO switching module.

The RapidIO switching module comprises an application layer, an adaptation layer and a drive layer from top to bottom, wherein the application layer generates and processes RapidIO messages and transmits the RapidIO messages and FC frames to the adaptation layer; the adaptation layer encapsulates and stores the RapidIO message and the FC frame; and the driving layer receives data from the processor board card and then uploads the data to the adaptation layer.

The transfer node module comprises an upper layer and a bottom layer, wherein the upper layer comprises an FC application layer and a RapidIO application layer, and the bottom layer also comprises an adaptation layer, an FC drive layer and a RapidIO drive layer; the FC application layer comprises an upper layer application, an FC simulation dynamic library layer and a data exchange layer from top to bottom, and the data exchange layer extracts data from the FC drive layer and the adaptation layer and forwards messages.

Further, the adaptation layers in the RapidIO switching module and the transit node module both include an FC buffer area for storing FC frames and a RapidIO buffer area for storing RapidIO data.

In addition, the conversion method of the RapidIO/FC protocol conversion system applied to the simulated ICP environment is characterized in that information interaction is carried out between internal modules through a RapidIO exchange module in the simulated ICP; and between the inside and the outside of the simulated ICP, the internal module sequentially passes through the RapidIO exchange module and the transit node module and then performs information interaction with the external module.

Further, after receiving the FC frame or RapidIO data from the driver layer, the adaptation layer in the RapidIO switching module distinguishes the data type thereof, including the following steps:

s11, judging whether the first word of the data packet load is an SOF (sequence of oriented subscriber identity), if so, executing a step S12; if not, the current data packet is RapidIO data;

s12, judging whether the last word of the data packet load is EOF or not, if so, executing a step S13; if not, the current data packet is RapidIO data;

s13, judging whether the penultimate word of the data packet load is 0XA5A5A5A5, if so, determining that the current data packet is an FC frame; if not, the current data packet is RapidIO data.

Further, there are three types of received data streams of the data exchange layer in the FC application layer on the upper layer of the transit node module, which are:

a) the FC simulation dynamic library carries out data interaction with an FC driving layer through a data exchange layer;

b) the FC simulation dynamic library carries out data interaction with the adaptation layer through the data exchange layer;

c) and the FC driving layer carries out data interaction with the adaptation layer through the data exchange layer.

Further, when the data exchange layer receives the FC frame message of the FC emulation dynamic library, the processing steps are as follows:

s21, inquiring an address table, judging whether the received FC frame message is a broadcast message, if so, executing a step S22; if not, go to step S23;

s22, sending the FC frame message to an FC driving layer and an adaptation layer respectively;

s23, judging whether the destination address has a corresponding table entry in the address table, if so, sending the FC frame message to an adaptation layer; if not, the FC frame message is sent to the FC drive layer.

Further, when the data exchange layer receives the data of the FC driver layer, the processing steps are as follows:

s31, inquiring an address table, judging whether the received data is a broadcast message, if so, executing a step S32; if not, go to step S33;

s32, respectively sending the data to an FC simulation dynamic library and an adaptation layer;

s33, judging whether the destination address is matched with the port address, if so, sending the data to an FC simulation dynamic library; if not, the data is sent to the adaptation layer.

Further, when the data exchange layer receives the data of the adaptation layer, the processing steps are as follows:

s41, inquiring an address table, judging whether the received data is a broadcast message, if so, executing a step S42; if not, go to step S43;

s42, respectively sending the data to an FC simulation dynamic library and an FC driving layer;

s43, judging whether the destination address is matched with the port address, if so, sending the data to an FC simulation dynamic library; if not, the data is sent to the FC drive layer.

The invention has the beneficial effects that: the real ICP adopts an expensive FC protocol technology, and in the simulation ICP system, the protocol conversion is realized through the invention, and on the premise of ensuring that an external hardware interface (FC) of the simulation ICP system is consistent with the real ICP system, the FC protocol can be replaced by a commercial mature RapidIO protocol, so that the cost is greatly saved.

Drawings

FIG. 1 is a schematic diagram of a typical avionics network architecture;

FIG. 2 is a schematic diagram of a real ICP data exchange;

FIG. 3 is a schematic diagram of an avionics network architecture based on simulated ICP;

FIG. 4 is a diagram of a RapidIO protocol hierarchy;

FIG. 5 is a hierarchical model diagram of a transit node module;

FIG. 6 is a schematic diagram of a specific structure of an FC application layer;

FIG. 7 is a schematic diagram of data communication between functional nodes within a simulated ICP;

FIG. 8 is a schematic diagram of the simulated ICP internal and external module communication;

FIG. 9 is an adaptation layer data reception flow diagram;

FIG. 10 is an adaptation layer cache composition diagram;

FIG. 11 is a diagram of FC data frame format;

FIG. 12 is a diagram of RapidIO bearer FC data;

FIG. 13 is a data flow diagram of a data exchange layer;

FIG. 14 is a flowchart of the process steps when a FC emulated dynamic library message is received by the data exchange layer;

fig. 15 is a flow chart of processing steps when the FC driver layer or adaptation layer data is received by the data exchange layer.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A RapidIO/FC protocol conversion system applied to a simulated ICP environment comprises: the RapidIO switching module and the transit node module are connected with the RapidIO switching module.

As shown in fig. 4, the RapidIO switch module includes, from top to bottom, an application layer, an adaptation layer, and a driver layer, the application layer generates and processes RapidIO messages, and transmits the RapidIO messages and FC frames to the adaptation layer, the adaptation layer encapsulates and stores the RapidIO messages and FC frames, and the driver layer receives data from the GPP board card and then uploads the data to the adaptation layer.

As shown in fig. 5, the transit node module includes an upper layer and a bottom layer, where the upper layer includes an FC application layer and a RapidIO application layer, and the bottom layer also includes an adaptation layer, and an FC driver layer and a RapidIO driver layer. As shown in fig. 6, the FC application layer includes, from top to bottom, an upper application layer, an FC emulated dynamic library layer, and a data exchange layer, where the data exchange layer extracts data from the FC driver layer and the adaptation layer, and forwards a message.

A conversion method of RapidIO/FC protocol conversion system applied to simulation ICP environment is disclosed, as shown in FIG. 7, information interaction is carried out between internal modules through a RapidIO exchange module in simulation ICP; as shown in fig. 8, between the inside and the outside of the simulated ICP, the internal module performs information interaction with the external module after passing through the RapidIO exchange module and the transit node module in sequence.

Example 2

This example is based on example 1:

when the RapidIO exchange module sends information, the application layer calls an ExterRioSendsmg interface, and the adaptation layer realizes the encapsulation of RapidIO messages and FC frames; when the RapidIO exchange module receives the information, as shown in fig. 9, the adaptation layer performs differentiated storage on the RapidIO message and the FC frame. As shown in fig. 10, the adaptation layer includes an FC buffer for storing FC frames and a RapidIO buffer for storing RapidIO data.

Example 3

The present embodiment provides a method for encapsulating RapidIO messages and FC frames based on embodiment 2.

The FC data frame format is shown in fig. 11, and includes a frame start SOF, a frame header, a frame payload, a check bit CRC, and an end bit EOF, where: (1) the start of frame SOF is used to define the start of a frame, which is an ordered set, and also to define frames of different types; (2) frame content and frame handling described in the frame header field, including 24 bytes of frame header, where R _ CTL denotes routing control, D _ ID denotes destination address, S _ ID denotes source address, CS _ CTL denotes class specific control, TYPE denotes data structure TYPE, F _ CTL denotes frame control, SEQ _ ID denotes sequence ID, SEQ _ CNT denotes sequence number, OX _ ID denotes source switch ID, RX _ ID denotes receiver switch ID, parameters denotes frame parameters; (3) the frame PayLoad (optical + PayLoad) consists of data of 0-2112 bytes, and the data needing to be transmitted is inside the frame PayLoad; (4) a check bit CRC is arranged behind a frame payload and used for checking whether the frame has errors in transmission; (5) finally, there is an end of frame bit EOF, which indicates the end of the frame.

The maximum length of a complete FC frame is 2148 bytes, and the maximum support of 4096-byte data load of the 11 th type packet provided by RapidIO is larger than the maximum length of the FC frame. Therefore, the FC frame can be encapsulated into the data of the 11 th class packet as shown in fig. 12.

Example 4

The embodiment provides a method for distinguishing a RapidIO message from an FC frame on the basis of the embodiment 2.

Since there is no relevant field in the RapidIO header to distinguish the TYPE of data (FC header has TYPE field, TYPE 1 indicates that the data is ELS message, TYPE 49 indicates that the data is ASM message), only the special field in the payload is used to distinguish the TYPE of data.

In the scheme, since the data only has two types of the FC frame and the RapidIO data, and the FC frame has SOF, CRC and EOF special identifications, whether the data is the FC frame can be judged by judging the SOF, the CRC and the EOF in the data frame.

Because of the FC third class of service, the effective SOF, CRC, and EOF are:

when the adaptation layer receives a data packet, the following judgment is made:

Example 5

This example is based on example 1:

in the transit node module, the data exchange layer is responsible for extracting data from the FC driver layer and the adaptation layer, and then forwarding the message, and there are three types of received data streams of the data exchange layer, as shown in fig. 13, which are:

Example 6

This example is based on example 5:

when the data exchange layer receives the FC frame message of the FC emulated dynamic library, as shown in fig. 14, the processing steps are as follows:

Example 7

This example is based on example 5:

when the data exchange layer receives the data of the FC driver layer, as shown in fig. 15, the processing steps are as follows:

Example 8

This example is based on example 5:

when the data exchange layer receives the data of the adaptation layer, as shown in fig. 15, the processing steps are as follows:

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the present invention is used, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either a wired or wireless connection.

Claims

1. A RapidIO/FC protocol conversion system applied to a simulated ICP environment is characterized by comprising: the system comprises a RapidIO switching module and a transit node module, wherein the transit node module is connected with the RapidIO switching module; in the simulated ICP, information interaction is carried out between the internal modules through a RapidIO exchange module; between the inside and the outside of the simulated ICP, the internal module performs information interaction with the external module after sequentially passing through the RapidIO switching module and the transit node module;

the RapidIO switching module comprises an application layer, an adaptation layer and a drive layer from top to bottom, wherein the application layer generates and processes RapidIO messages and transmits the RapidIO messages and FC frames to the adaptation layer; the adaptation layer encapsulates and stores the RapidIO message and the FC frame; the driving layer receives data from the processor board card and then uploads the data to the adaptation layer;

2. A RapidIO/FC protocol conversion system applied to a simulated ICP environment according to claim 1, wherein the adaptation layers in the RapidIO switch module and the transit node module each include an FC buffer for storing FC frames and a RapidIO buffer for storing RapidIO data.

3. A conversion method of RapidIO/FC protocol conversion system applied to a simulated ICP environment according to claim 1, wherein there are three kinds of received data streams of a data exchange layer in an FC application layer above the transit node module, which are respectively:

4. A RapidIO/FC protocol conversion method applied to an ICP environment simulation environment according to claim 3, wherein after receiving an FC frame or RapidIO data from a driver layer, an adaptation layer in the RapidIO switching module distinguishes the data types thereof, including the following steps:

5. The RapidIO/FC protocol conversion method applied to the analog ICP environment according to claim 3, characterized in that when the data exchange layer receives the FC frame message of the FC emulation dynamic library, the processing steps are as follows:

6. A RapidIO/FC protocol conversion method applied to an ICP environment simulation environment according to claim 3, wherein when the data exchange layer receives data of the FC driver layer, the processing steps are as follows:

7. A RapidIO/FC protocol conversion method applied to an ICP environment simulation environment according to claim 3, wherein when the data exchange layer receives the data of the adaptation layer, the processing steps are as follows: