WO2010096980A1

WO2010096980A1 - Method and device for transmitting data

Info

Publication number: WO2010096980A1
Application number: PCT/CN2009/073878
Authority: WO
Inventors: 张粤; 李旭慧
Original assignee: 成都市华为赛门铁克科技有限公司
Priority date: 2009-02-25
Filing date: 2009-09-11
Publication date: 2010-09-02
Also published as: CN101504627A; CN101504627B

Abstract

A method for transmitting a data based on a FC controller port is disclosed, including: receiving an information packet, and judging whether the information packet is an initiator information packet or a target information packet; if the information packet is the initiator information packet, acting as the initiator to process the initiator information packet; if the information packet is the target information packet, acting as the target to process the target information packet. The FC controller port and a FC layer unit are also disclosed.

Description

The present invention claims the priority of the Chinese patent application filed on February 25, 2009, the Chinese Patent Application No. 200910118306.6, entitled "A Method and Apparatus for Transmitting Data". The entire contents are incorporated herein by reference.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting data.

Background technique

The Small Computer System Interface (SCSI) is an interface technology developed for small computers. With the development of computer technology, it has been completely transplanted to ordinary personal computers (PCs). The SCSI-based Fibre Channel Protocol for SCSI (FCP-SCSI) is designed to transmit SCSI protocols between Fibre Channel-based (FC, Fibre Channel) ports via FCP. This protocol allows Fibre Channel to be used without any modifications to previous SCSI-based applications. FC-SCSI is the primary means of communication between storage systems and servers. According to the SCSI protocol definition, inter-device communication occurs between the initiator and the target, and the command is always sent by the initiator, and the target accepts the command. Since the FCP protocol is designed to inherit the SCSI protocol, devices designed according to the FCP protocol also inherit the characteristics of the SCSI protocol. When the devices communicate via Fibre Channel, the FC initiator needs to send commands to be received by the FC target. Command, and then complete inter-device input/output (I/O) communication.

According to the SCSI Architecture Model (SAM, SCSI Architecture Model), the SCSI fabric model is divided into a SCSI Initiator I/O System and a SCSI Target I/O System, where the Initiator is The system can initiate SCSI requests actively, the Target subsystem can passively process requests and bring back data and responses, both active/passive cannot be reversed; the ports that can handle the FC protocol are collectively referred to as FC controller ports, which include initiators and targets. The FC controller port is commonly used for I/O interaction between two subsystems.

Referring to Figure 1, it is a schematic diagram of establishing a connection between a prior art FC initiator and a target. According to the FCP protocol, the FC port is not the initiator port, but the target port. In the process of establishing a connection, the initiator can only establish an active connection on the FC-4 layer, and the target can only establish a passive connection on the FC-4 layer. That is, in Figure 1, the data transmission direction of the FC-4 layer must be transmitted by the initiator to the target.

However, during the implementation process, the inventors found that at least the following problems exist in the prior art: Due to the constraints of the SAM architecture, requests can only be sent in one direction. That is, usually the FC controller port is strictly limited to active or passive mode in the application. A connection can only be initiated in one direction, and a request can only be initiated in one direction on the established connection (the initiator initiates a request to the target;); to send the request in both directions, another FC controller must be added, increasing the hardware cost. Summary of the invention

The embodiment of the invention provides a method and a device for transmitting data, so that the FC controller port can send and receive requests in both directions, thereby reducing hardware costs.

A method for transmitting data based on a Fibre Channel FC controller port according to an embodiment of the present invention includes:

The Fibre Channel FC controller port receives the information packet, and determines whether the information packet is a starter information packet or a target information packet;

If the packet is an initiator packet, the FC controller port processes the initiator packet as an initiator;

If the packet is a target packet, the FC controller port processes the target packet as a target.

The embodiment of the invention further provides a Fibre Channel FC controller port, including:

The packet determining module is configured to receive the information packet, and when determining that the received information packet is an initiator information packet, transmit the initiator information packet to the initiator module, and determine that the received information packet is a target information packet. Transmitting the target information packet to a target module;

The initiator module is configured to process the received initiator packet according to the manner of the initiator; and the target module is configured to process the received target packet according to the manner of the target. The embodiment of the present invention further provides an FC layer unit, located on an FC controller port, including: a physical PHY layer, configured to establish a physical connection of a Fibre Channel, receive a packet through a Fibre Channel; and an FC-2 layer, configured to determine When the received information packet is a starter information packet, the initiator information packet is transmitted to the initiator module, and when the received information packet is a target information packet, the target information packet is transmitted to the target. Module

The FC-4 layer, including the initiator module and the target module, is used to process the received packets. The embodiment of the present invention enables the FC controller port based on the FCP design to send and receive requests in both directions, that is, the same FC controller port can send requests and receive requests, thereby saving hardware without changing the hardware structure. Resources, reducing the production cost of the product. Moreover, since the hardware resources are saved, the saved resources can be further utilized to redundantly protect the existing resources, thereby enhancing the reliability of the system. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a schematic diagram of establishing a connection between a prior art FC initiator and a target;

2 is a schematic diagram of establishing a connection between an FC initiator and a target according to an embodiment of the present invention; FIG. 3 is a flowchart of a method for transmitting data according to an embodiment of the present invention;

4 is a schematic structural diagram of a FC controller port according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an FC layer unit according to an embodiment of the present invention. detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

The embodiment of the present invention multiplexes the functions of the FC initiator and the FC target to an FC controller port to solve the problem that the FC controller port based on the FCP design is strictly limited to the active or passive mode in the application. Two connections are established at the FC-4 layer of the FC controller port, see FIG. 2, which is a schematic diagram of establishing a connection between the FC initiator and the target according to an embodiment of the present invention. One of the two connections established by the FC-4 layer acts as an active connection, and the other acts as a passive connection. The active connection acts as an active initiator request operation of the Initiator. The passive connection is used as a Target to receive requests and return request responses, data, etc. operating. Two connections in the application correspond to a connection to FC-2, The FC packets are judged and filtered by the direction of the connection.

That is, at the connection level, each FC controller port handles two modes of connectivity: both active initiation of FC-4 connections and passive reception of FC-4 connections; on the FC-4 layer, each The port has both active and passive connections: the active connection is used to send request data, and the passive connection is used to receive response request data;

A method for transmitting data according to an embodiment of the present invention, as shown in FIG. 3, includes:

Step 301: The Fibre Channel FC controller port receives the information packet through the Fibre Channel;

Step 302, determining, according to the packet information, whether the received packet is an initiator packet or a target packet, if it is an initiator packet, performing step 303, if it is a target packet, executing step 304;

The step of determining whether the received packet is an initiator packet or a target packet may include:

Determining whether the initiator packet or the target packet is received according to the packet header of the packet includes:

Referring to Table 1, it is a frame header structure diagram of FC-2 according to an embodiment of the present invention, that is, a packet header.

Table 1

According to the receiver ID (Destination ID), the initiator ID (Source ID) in the packet header in Table 1, and the frame control direction (Frame Control) relative to the initiator, it is judged whether the initiator packet or the target is received. Packet.

First of all, the information package can be divided into: command packet, data packet, response packet, etc., and the judgment is The initiator packet or the target packet is usually for the command packet. The command packet is usually the first packet. The receiver information of other subsequent packets is the same as the command packet, and the subsequent stages do not need to be repeated.

The above judgment method is as follows:

The FC controller port controls the direction of the frame relative to the initiator in the packet header in Table 1.

(Frame Control) determines whether it is the sender or the receiver. If it is the sender and the originator ID (Source lD) is the same as itself, it determines that it is currently the initiator, and the currently received packet is the initiator packet;

If it is the receiver, it first determines whether the received packet is a command packet. If yes, it is determined whether the recipient ID (the Destination ID) in the packet header is the same as its own ID. If the same, it determines that it is currently the target. The currently received packet is the target packet.

In the step 303, the FC controller port is used as the initiator to process the initiator packet; the method is the same as that in the prior art, and the manner in which the FC controller port is used as the initiator to process the initiator packet is not described herein. Implementation process.

Step 304: The FC controller port processes the target information packet as a target.

The manner in which the FC controller port is used as the target to process the target information packet is the same as the prior art. The specific implementation process is not described here.

The process shown in FIG. 3 may further include: The FC controller port performs application layer processing on the processed initiator packet or the target packet. The processing of the application layer is the same as that of the prior art, and the specific implementation process will not be described herein.

The method for transmitting data provided by the embodiment of the present invention enables the same FC controller port to send a request and receive a request, thereby saving hardware resources and reducing production cost of the product without changing the hardware structure. . Moreover, since the hardware resources are saved, the resources saved can be further utilized to redundantly protect the existing resources, thereby enhancing the reliability of the system.

Referring to FIG. 4, it is a schematic diagram of a structure of a port of a FC controller according to an embodiment of the present invention, including: a packet judgment module 401, configured to receive a packet, and determine that the received packet is an initiator packet, The initiator information packet is transmitted to the initiator module 402, and when the received information packet is the target information packet, the target information packet is transmitted to the target module 403; the specific determination method is the same as the content in the foregoing method flow. , No longer. The initiator module 402 is configured to process the received initiator packet according to the manner of the initiator. The manner of processing the received initiator packet according to the manner of the initiator is the same as the prior art. The specific implementation process will not be described again.

The target module 403 is configured to process the received target packet according to the manner of the target. The manner in which the received target information packet is processed in the manner of the target is the same as the prior art, and the specific implementation process will not be described herein.

The foregoing FC controller port may further include: an application module 404, configured to perform application layer processing on the received initiator information packet or the target device information packet. The processing of the application layer is the same as that of the prior art, and the specific implementation process will not be described herein.

The foregoing packet determining module may include: a connecting submodule 4011 and a determining submodule 4012, wherein the connecting submodule 4011 is configured to establish a physical connection of the Fibre Channel, and receive the information packet through the Fibre Channel; and the determining submodule 4012 is configured to determine the receiving When the obtained information packet is an initiator information packet, the initiator information packet is transmitted to the initiator module, and when the received information packet is a target information packet, the target information packet is transmitted to the target device. Module.

Specifically, the process of determining whether the received packet is an initiator packet or a target packet is the same as the foregoing method, and details are not described herein again.

The above connection submodule is located at the physical (PHY) layer of the FC controller port; the judgment submodule is located at the FC-2 layer of the FC controller port; the initiator module and the target module are located at the FC-4 layer of the FC controller port. The PHY layer, the FC-2 layer, and the FC-4 layer may be collectively referred to as an FC layer.

The application module 404 is located at the application APP layer of the FC controller port.

The FC controller port provided by the embodiment of the present invention enables the same FC controller port to send a request and receive a request, thereby saving hardware resources and reducing the production cost of the product without changing the hardware structure. . Moreover, since the hardware resources are saved, the resources saved can be further utilized to redundantly protect the existing resources, thereby enhancing the reliability of the system.

The embodiment of the present invention further provides an FC layer unit, as shown in FIG. 5, located on the FC controller port, including:

a physical (PHY) layer 503, configured to establish a physical connection of the fiber channel, and receive the information packet through the fiber channel;

The FC-2 layer 502 is configured to: when it is determined that the received information packet is an initiator information packet, The transmitter information packet is transmitted to the initiator module of the FC-4 layer, and when the received information packet is the target information packet, the target information packet is transmitted to the target module of the FC-4 layer;

The FC-4 layer 501 includes an initiator module and a target module for processing the received packet. The manner in which the initiator module and the target module process the received packet is the same as the existing one, and is not described here.

By applying the embodiment of the present invention, the same FC controller port can send a request and receive a request, thereby saving hardware resources and reducing product production cost without changing the hardware structure. Moreover, due to the saving of hardware resources, the resources saved can be further utilized to provide redundancy protection for existing resources, thereby enhancing system reliability.

A person skilled in the art can understand that all or part of the steps in implementing the above method embodiments can be completed by a program instructing related hardware, and the program can be stored in a computer readable storage medium, which is referred to herein. Storage media, such as: ROM/RAM, disk, CD, etc.

The above description is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

A method for transmitting data based on a Fibre Channel FC controller port, comprising:

The Fibre Channel FC controller port receives the information packet, and determines, according to the information of the information packet, whether the information packet is an initiator information packet or a target information packet;

If the information packet is an initiator packet, the FC controller port processes the initiator packet as an initiator;

2. The method according to claim 1, wherein the step of determining, according to the packet information, whether the information packet is an initiator packet or a target packet comprises:

Whether the initiator packet or the target packet is received is determined according to the packet header of the packet.

The method according to claim 2, wherein the step of determining whether the initiator packet or the target packet is received according to the header of the packet comprises:

Determining, according to the frame control direction of the packet header relative to the initiator, Frame Control determines whether the FC controller port is a sender or a receiver;

If it is the sender and the initiator ID is the same as the FC controller port, the currently received packet is the initiator packet;

If it is the receiver, it is determined whether the received packet is a command packet, and it is determined whether the receiver ID in the packet header is the same as the ID of the FC control port. If the same, the currently received packet is the target. Packet.

The method according to claim 1, wherein before the FC controller port receives the information packet, the method further includes: establishing an external bidirectional connection at the FC-4 layer of the FC controller.

The method according to claim 1, wherein the method further comprises: performing, by the FC controller port, application layer processing on the processed initiator packet or the target packet.

6. A Fibre Channel FC controller port, comprising:

a packet judging module, configured to receive a packet, and when determining, according to the packet information, that the received packet is an initiator packet, transmitting the initiator packet to a launcher module, and determining that the received packet is Transmitting the target information packet to the target module when the target packet is used; The initiator module is configured to process the received initiator packet according to the manner of the initiator; and the target module is configured to process the received target packet according to the manner of the target.

The FC controller port according to claim 6, wherein the FC controller port further includes:

An application module, configured to perform application layer processing on the received initiator packet or target packet.

The FC controller port according to claim 6, wherein the packet determining module comprises:

a connection submodule, configured to establish a physical connection of the Fibre Channel, and receive the information packet by using the Fibre Channel; and a determining submodule, configured to: when determining that the received information packet is an initiator information packet, transmitting the initiator information packet to The initiator module, when determining that the received packet is a target packet, transmits the target packet to the target module.

9. The FC controller port of claim 8 wherein:

The connection submodule is located at a physical PHY layer of the FC controller port;

The determining submodule is located at the FC-2 layer of the FC controller port;

The initiator module and the target module are located at the FC-4 layer of the FC controller port.

10. The FC controller port of claim 7, wherein:

The application module is located at the application APP layer of the FC controller port.

11. A FC layer unit, located on a FC controller port, comprising: a physical PHY layer, configured to establish a physical connection of a fiber channel, and receive a packet through a fiber channel;

An FC-2 layer, configured to determine, according to the information of the information packet, whether the received information packet is an initiator information packet or a target information packet;

The FC-4 layer is used to process the determined initiator packet in the manner of the initiator, and the determined target packet is processed in the manner of the target.