Data packet forwarding method based on software table look-up

A forwarding method and data packet technology, applied in data exchange networks, electrical components, digital transmission systems, etc., can solve the problems that the table lookup algorithm is not suitable for large-scale table item lookups, cost-effective Intel platforms, and inability to use CPU platforms. , to achieve the effect of large-capacity table lookup, high throughput, good scalability and programmable features

Inactive Publication Date: 2015-11-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

Some researchers such as DongZhou et al. proposed a software switch design scheme called CuckooSwitch [3] , but this type of software switch needs to send all the data packets to the DRAM memory through the bus, coupled with the uncertainty of the software look-up table operation, this operation has a relatively large delay
At the same time, when the amount of data that the switch needs to process becomes very large, the data path (PCIE bus) between the software and hardware will become a bottleneck, seriously affecting the throughput of the switch.
[0006] Some researchers have noticed this defect of the software switch. For e

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  • Data packet forwarding method based on software table look-up
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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation examples.

[0047] In order to better describe this implementation example, the detailed steps are described as follows:

[0048] Step ①: The input port of the network device is always in the state of monitoring whether there is a data packet arriving at the input port. When the incoming data packet is detected correctly, the input port extracts the key information of the packet header according to the type of the data packet to form a data packet descriptor and uploads it to PCIE The interface module sends the complete data packet to the input buffer module for temporary storage, waiting for subsequent processing;

[0049] Input interface module 1~N (N≥2) such as image 3 As shown, after receiving the data packet, the packet header is first extracted to form a data packet descriptor, and uploaded to the cache of the PCIE interface module to...

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Abstract

The invention relates to a data packet forwarding method based on software table look-up. The method is based on Intel DPDK, and adopts hardware to extract a data packet header, rapid data transmission software to transmit data in batch efficiently, and software to look up table flexibly so as to realize a data packet forwarding function of a switch. A table look-up algorithm realizes the effects of storing enough items and improving table look-up speed by combining a cuckoo hash table and an open addressing method. Network equipment is allowed to have the following characteristics of multiport wire-speed forwarding, flexible high-capacity table look-up and low cost. The method combines the high-speed packet forming capability of the hardware, the mass data packet processing and forwarding capability of the rapid data transmission software and the high-speed flexible look-up capability of the software; compared with the conventional hardware switch, the method has better extendibility and programmability; and compared with a conventional software switch, the method can provide larger throughput rate and smaller time delay.

Description

technical field [0001] The invention relates to network equipment, in particular to a data packet forwarding method based on software look-up table of the network equipment. Background technique [0002] A data center network switch is a hardware device that forwards data packets in a data center network. When other network devices in the data center, such as terminal hosts or storage systems, are coupled with data center network switches, data transmission between hardware devices can be performed through the data center network switches. When a hardware device coupled to a switch sends data to another hardware device coupled to the switch, the device that sends the data is called the source device, the data center network switch is called the intermediate device, and the device that receives the data is called the source device. for the target device. When the source device sends data to the target device through the data center network switch, the data center network sw...

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Application Information

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IPC IPC(8): H04L12/931H04L12/935H04L12/741H04L45/74H04L49/111
Inventor 涂晓东谢军孟中楼陈大伟杨军张毅
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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