CN104133692A - A multiple configuration system and configuration method for TCAM based on FPGA dynamic reconfiguration technology - Google Patents

Abstract

The invention discloses a TCAM diversified configuration system and a TCAM diversified configuration method based on FPGA dynamic reconfiguration technology, which comprises an FPGA dynamic reconfiguration unit, a dynamic reconfiguration configuration unit, a control unit and a TCAM, wherein the FPGA dynamic reconfiguration unit is used for converting pre-realized functions to generate a corresponding dynamic reconfiguration logic circuit, then performing dynamic reconfiguration layout, generating a corresponding functional circuit and then generating a corresponding dynamic reconfiguration file; the dynamic reconfiguration unit is used for downloading and operating a dynamic reconfiguration file and executing actions according to a control command of the control unit; the control unit is used for monitoring the TCAM running state communicated with the control unit in real time, sending a dynamic configuration command when the TCAM runs abnormally, and controlling the dynamic reconfiguration unit to carry out reconfiguration repair on the TCAM or carry out reconfiguration function on the TCAM. According to the invention, by using the dynamic reconfiguration technology of the FPGA, when the TCAM has problems during the use, the TCAM can be reconfigured by using the dynamic reconfiguration technology of the FPGA to achieve the aim of repairing, the operation is simple and convenient, and the utilization efficiency of device resources is improved.

Description

A multiple configuration system and configuration method for TCAM based on FPGA dynamic reconfiguration technology

technical field

The invention relates to a multi-configuration system and a corresponding configuration method for TCAM realized by using FPGA dynamic reconfiguration technology.

Background technique

With the rapid development of the network, TCAM is widely used in various fields, and people's demand for TCAM is also increasing. Although TCAM is powerful, its operation is relatively complicated. Generally, if you want to change the application function of TCAM, you need to use the host computer software to download its parameters with commands or pages. At this time, it is necessary to reset the TCAM; at the same time, after the reset, the TCAM will not work normally; at this time, it is necessary to reset the TCAM or even reset the whole machine, which is a fatal flaw for large systems. Usually, if we want to change the application function of TCAM, we need to take the corresponding equipment back and rewrite the program for debugging, which is time-consuming and labor-intensive.

Contents of the invention

In view of the defects in the prior art, the purpose of the present invention is to provide a diversified configuration system and method for TCAM based on FPGA dynamic reconfiguration technology, so as to realize reconfiguration when errors occur during TCAM work, or Make TCAM realize different functions in different periods, different places or according to requirements.

In order to achieve the above object, technical scheme of the present invention:

A kind of multiple configuration system to TCAM is realized based on FPGA dynamic reconfiguration technology, it is characterized in that:

Including FPGA dynamic reconfiguration unit, dynamic reconfiguration configuration unit, control unit and TCAM,

The FPGA dynamic reconfiguration unit is used to write pre-implemented TCAM functions into corresponding FPGA dynamic reconfiguration codes, convert and generate corresponding dynamic reconfiguration logic circuits, and then perform dynamic reconfiguration layout and generate corresponding functional circuits, which will generate Compare the functional circuit with the design requirement form, and generate the dynamic reconfiguration file corresponding to the dynamic reconfiguration task after meeting the design requirements;

The dynamic reconfiguration configuration unit is used to download and run the above dynamic reconfiguration file, and at the same time execute the corresponding dynamic reconfiguration process according to the control command of the control unit;

The control unit is used to monitor the running state of the TCAM communicating with it in real time, send a dynamic configuration command when the TCAM is running abnormally, and control the dynamic reconfiguration configuration unit to reconfigure and repair the TCAM or when receiving an external new function request, send a corresponding dynamic The configuration command controls the corresponding function of the dynamic reconfiguration configuration unit to reconfigure the TCAM.

The control unit includes a TCAM monitoring module for real-time monitoring of the running state of the TCAM and a dynamic configuration control module for issuing corresponding dynamic configuration commands according to the monitoring situation of the TCAM monitoring module.

Described control unit also comprises function switch module, and this function switch module is used for being connected with external function switch button, and each function sheet file corresponding to each dynamic reconfiguration file that FPGA dynamic reconfiguration unit generates is set inside simultaneously, in After receiving the key function signal corresponding to the external function switching key, the corresponding command is issued to the dynamic configuration control module, and the dynamic configuration control module performs corresponding function configuration on the TCAM.

The present invention also designs a kind of method based on FPGA dynamic reconfiguration technology to realize the pluralistic configuration method to TCAM, it is characterized in that:

Step 101: The FPGA dynamic reconfiguration unit configures the corresponding TCAM logic according to the pre-implemented TCAM function, and writes the corresponding FPGA dynamic reconfiguration code;

Step 102: converting the FPGA dynamic reconfiguration code into a corresponding dynamic reconfiguration logic circuit;

Step 103: Perform FPGA dynamic reconfiguration layout, that is, divide the fixed area position of the dynamic reconfiguration circuit on the FPGA dynamic reconfiguration unit, and perform timing constraints on the logic circuits to be generated, so as to ensure compliance with the timing requirements of TCAM;

Step 104: Perform logical wiring after step 103 is completed, that is, generate a corresponding configuration file and generate a corresponding functional circuit according to the configuration file;

Step 105: Check whether the generated functional circuit meets the design requirement form; if it meets, go to 107, if not, return to 106;

Step 106: re-modify the FPGA dynamic reconfiguration code, return to step 102 and re-execute step 103 → step 104 → step 105 after modification, until the design requirements of the design requirements form are met;

Step 107: Use the FPGA dynamic reconfiguration unit to generate the dynamic reconfiguration file corresponding to the dynamic reconfiguration task, and the dynamic reconfiguration configuration unit downloads the above dynamic reconfiguration file, while waiting for the control command of the control unit and executing the corresponding dynamic reconfiguration file according to the control command. refactoring process;

Step 108: Use the control unit to communicate with external modules in real time, and receive external commands to control the dynamic reconfiguration configuration unit to reconfigure the TCAM to change the existing functions of the TCAM; or monitor the TCAM in real time, when the communication module of the TCAM sends When an error message or communication with the TCAM is interrupted, control the dynamic reconfiguration unit to re-initialize the TCMA.

Described method also arranges function switching module to realize the external control function switching process, and this function switching module is connected with external function switching button, and each function sheet corresponding to each dynamic reconstruction file that FPGA dynamic reconstruction unit generates is set inside simultaneously file, after receiving the key function signal corresponding to the external function switching key, issue the corresponding command to the dynamic configuration control module, and the dynamic configuration control module performs corresponding function configuration on the TCAM.

Compared with prior art, the beneficial effect of the present invention:

The present invention utilizes the dynamic reconfiguration technology of FPGA. When the TCAM is affected by various factors such as its complex timing and external environment during operation, causing problems during the use of the TCAM, the dynamic reconfiguration technology of FPGA can be used to reconfigure the TCAM. Configuration, to achieve the purpose of repair, its operation is simple, improve device resource utilization efficiency. Reasons for improving the utilization rate: Because in different application places, the functions required to be realized by TCAM are different. If the demand for TCAM functions increases, the number of TCAMs needs to be increased. If the number of TCAMs is not increased, when the equipment is changed to the application site, the equipment needs to be brought back to the company to rewrite the code, and it can be applied to the new site after a long-term test, which is time-consuming and laborious. .

Description of drawings

Fig. 1 is the schematic structural diagram of the principle of the system of the present invention;

Fig. 2 is a schematic structural diagram of the principle structure of the system control unit of the present invention;

Fig. 3 is a schematic diagram of the principle steps of the present invention.

Detailed ways

The technical scheme of the present invention is further described below in conjunction with accompanying drawing and specific embodiment:

In order to solve the defects in the prior art, the object of the present invention is to utilize the FPGA dynamic reconfiguration technology, that is, the functions to be realized by the TCAM will be set at the initial stage of project design and the logic planning stage, and programmed with FPGA inside the FPGA The software sets the timing, function, area, and logical space occupied, so that any changes to other functions in the future will not affect this area. At the same time, FPGA dynamic reconfiguration technology has become more and more mature, and more and more series can be supported; and the portability is getting better and better. After transplantation, it is similar to the FPGA hard core, so the reliability is higher.

The process of realizing the technical means of this patent:

First plan the functions to be realized by TCAM, and then write TCAM function codes. Use the ISE software to plan several fixed areas inside the FPGA. This area is only used for the TCAM operation function code. If other functions of the FPGA are modified, this area cannot be operated, and other functions of the FPGA will not be affected. This design ensures the reliability of operating TCAM, because when implementing large-scale and complex functions in FPGA, changing a part requires re-planning the entire code, so when reconfiguring TCAM functions, it takes a lot of manpower and time. This problem can be well solved by adopting this patent, because it has passed verification in the initial design stage. And use the ISE software to solidify it inside the FPGA, no matter how other programs of the FPGA change, it will not affect the function of the TCAM.

When an external function key is detected or the host computer (PC) needs TCAM to implement other functions, it will notify the FPGA to execute the corresponding function;

At the same time, when the software (graphics software) of the upper computer finds that the operation of the TCAM fails, it issues instructions to realize the reconfiguration of the TCAM.

In view of the above ideas, a diversified configuration system for TCAM based on FPGA dynamic reconfiguration technology is shown in Figure 1:

Including FPGA dynamic reconfiguration unit, dynamic reconfiguration configuration unit, control unit and TCAM,

The FPGA dynamic reconfiguration unit is used to write pre-implemented TCAM functions into corresponding FPGA dynamic reconfiguration codes, convert and generate corresponding dynamic reconfiguration logic circuits, and then perform dynamic reconfiguration layout and generate corresponding functional circuits, which will generate Compare the functional circuit with the design requirement form, and generate the dynamic reconfiguration file corresponding to the dynamic reconfiguration task after meeting the design requirements;

The dynamic reconfiguration configuration unit is used to download and run the above dynamic reconfiguration file, and at the same time execute the corresponding dynamic reconfiguration process according to the control command of the control unit;

The control unit is used to monitor the running state of the TCAM communicating with it in real time, send a dynamic configuration command when the TCAM is running abnormally, and control the dynamic reconfiguration configuration unit to reconfigure and repair the TCAM or when receiving an external new function request, send a corresponding dynamic The configuration command controls the corresponding function of the dynamic reconfiguration configuration unit to reconfigure the TCAM.

As shown in Figure 2: further, the control unit includes a TCAM monitoring module for real-time monitoring of the TCAM operating status and a dynamic configuration control module for issuing corresponding dynamic configuration commands according to the monitoring situation of the TCAM monitoring module.

Described TCAM monitoring module can be CPU, and described TCAM monitoring module carries out dynamic monitoring during TCAM operation, when TCAM chip is through working for a period of time, thus can not work normally due to being affected by other environment, as finding TCAM content when matching fails , feedback information to the dynamic configuration module, the dynamic configuration control module issues a corresponding dynamic reconfiguration instruction to the dynamic reconfiguration configuration unit, and the dynamic reconfiguration configuration unit invokes the corresponding dynamic reconfiguration file, and uses the dynamic reconfiguration technology to reconfigure the TCAM.

The dynamic configuration control module may be a CPU. When the TCAM is in operation, it is affected by various factors such as its own complex timing and external environment, which causes problems during the use of the TCAM. The dynamic configuration control module issues corresponding dynamic reconfiguration instructions, and controls the dynamic reconfiguration configuration unit to call corresponding dynamic reconfiguration files, so as to reconfigure the TCAM and achieve the purpose of repairing.

Described control unit also comprises function switch module, and this function switch module is used for being connected with external function switch button, and each function sheet file corresponding to each dynamic reconfiguration file that FPGA dynamic reconfiguration unit generates is set inside simultaneously, in After receiving the key function signal corresponding to the external function switching key, the corresponding command is issued to the dynamic configuration control module, and the dynamic configuration control module performs corresponding function configuration on the TCAM.

As shown in Figure 3, the embodiment of the present invention is based on the FPGA dynamic reconfiguration technology to carry out multiple configurations to the TCAM, and the specific method steps are as follows:

Step 101: Design pre-implemented TCAM functions (such as IP packet filtering, search, verification, etc.), configure corresponding TCAM logic, and write FPGA dynamic reconfiguration codes.

Step 102: Use FPGA ISE software to dynamically reconfigure the FPGA code to generate corresponding logic circuits.

Step 103: Use the FPGA ISE software to do the reconstruction layout, divide the fixed area position of the dynamic reconstruction circuit to ensure that this area is not affected by other functions, and when the functions of other areas of the FPGA change, the functions of this area do not change; and It performs timing constraints to ensure compliance with the timing requirements of the TCAM.

Step 104: Finish the work in 103, then use the FPGA ISE software to generate configuration files, and use the FPGA ISE software to generate functional circuits for design.

Step 105: check the design requirement form (including circuit and software design report), whether it meets the design requirement. If it meets, go to 107, if not, return to 106.

Step 106: re-modify the code, return to 102 and re-execute 103, 104, 105 after modification, until the design requirements are met.

Step 107: Step 107: The FPGA dynamic reconfiguration unit generates the dynamic reconfiguration file corresponding to the dynamic reconfiguration task, and the dynamic reconfiguration configuration unit downloads the dynamic reconfiguration file to the above-mentioned dynamic reconfiguration file, while waiting for the control command of the dynamic reconfiguration control unit and following Control commands to execute actions;

Step 108: The control unit communicates with the external module in real time, and receives an externally issued command to control the dynamic reconfiguration configuration unit to reconfigure the TCAM function (such as the new function is IP packet filtering) to change the existing IP packet of the TCAM Search function; or monitor TCAM in real time, when the communication module of TCAM sends an error message or the communication with TCAM is interrupted, control the dynamic reconfiguration configuration unit to re-initialize TCMA.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (5)

1. A kind of multiple configuration system to TCAM is realized based on FPGA dynamic reconfiguration technology, it is characterized in that: Including FPGA dynamic reconfiguration unit, dynamic reconfiguration configuration unit, control unit and TCAM, The FPGA dynamic reconfiguration unit is used to write pre-implemented TCAM functions into corresponding FPGA dynamic reconfiguration codes, convert and generate corresponding dynamic reconfiguration logic circuits, and then perform dynamic reconfiguration layout and generate corresponding functional circuits, which will generate Compare the functional circuit with the design requirement form, and generate the dynamic reconfiguration file corresponding to the dynamic reconfiguration task after meeting the design requirements; The dynamic reconfiguration configuration unit is used to download and run the above dynamic reconfiguration file, and perform actions according to the control commands of the control unit; The control unit is used to monitor the running state of the TCAM communicating with it in real time, send a dynamic configuration command when the TCAM is running abnormally, and control the dynamic reconfiguration configuration unit to reconfigure and repair the TCAM or when receiving an external new function request, send a corresponding dynamic The configuration command controls the corresponding function of the dynamic reconfiguration configuration unit to reconfigure the TCAM. 2. The multi-configuration system according to claim 1, characterized in that: the control unit includes a TCAM monitoring module for real-time monitoring of the TCAM operating status and a dynamic configuration command for issuing corresponding dynamic configuration commands according to the monitoring situation of the TCAM monitoring module. Configure the module. 3. The diversified configuration system according to claim 2, characterized in that: said control unit also includes a function switching module, which is used to connect with external function switching buttons, and simultaneously internally set and FPGA dynamic reconfiguration Each dynamic reconstruction file generated by the unit corresponds to each function form file one by one. After receiving the button function signal corresponding to the external function switching button, the corresponding command is issued to the dynamic configuration control module, and the dynamic configuration control module performs corresponding TCAM Function configuration. 4. A kind of multiple configuration method to TCAM is realized based on FPGA dynamic reconfiguration technology, it is characterized in that: Step 101: The FPGA dynamic reconfiguration unit configures the corresponding TCAM logic according to the pre-implemented TCAM function, and writes the corresponding FPGA dynamic reconfiguration code; Step 102: converting the FPGA dynamic reconfiguration code into a corresponding dynamic reconfiguration logic circuit; Step 103: Perform FPGA dynamic reconfiguration layout, that is, divide the fixed area position of the dynamic reconfiguration circuit on the FPGA dynamic reconfiguration unit, and perform timing constraints on the logic circuits to be generated, so as to ensure compliance with the timing requirements of TCAM; Step 104: Perform logical wiring after step 103 is completed, that is, generate a corresponding configuration file and generate a corresponding functional circuit according to the configuration file; Step 105: Check whether the generated functional circuit meets the design requirement form; if it meets, go to 107, if not, return to 106; Step 106: re-modify the FPGA dynamic reconfiguration code, return to step 102 and re-execute step 103 → step 104 → step 105 after modification, until the design requirements of the design requirements form are met; Step 107: Use the FPGA dynamic reconfiguration unit to generate the dynamic reconfiguration file corresponding to the dynamic reconfiguration task, and the dynamic reconfiguration configuration unit downloads the above dynamic reconfiguration file, while waiting for the control command of the control unit and executing the corresponding dynamic reconfiguration file according to the control command. refactoring process; Step 108: Use the control unit to communicate with external modules in real time, and receive external commands to control the dynamic reconfiguration configuration unit to reconfigure the TCAM to change the existing functions of the TCAM; or monitor the TCAM in real time, when the communication module of the TCAM sends When an error message or communication with the TCAM is interrupted, control the dynamic reconfiguration unit to re-initialize the TCMA. 5. The diversified configuration method according to claim 2, characterized in that: the method also sets a function switching module to realize the external control function switching process, and the function switching module is connected with the external function switching button, and is internally set and FPGA Each dynamic reconstruction file generated by the dynamic reconstruction unit corresponds to each function form file one by one. After receiving the button function signal corresponding to the external function switch button, the corresponding command is issued to the dynamic configuration control module. Configure the corresponding functions.