Method for realizing TCP (transmission control protocol) connection data buffer by combining software and hardware

Abstract

The invention provides a method for realizing TCP connection data caching by combining software and hardware. The hardware network card receives the message, performs TCP connection management and sorting, the interface library constructs the TCP node structure for the new connection, and reserves a buffer area before the memory of the TCP data of each packet to cache the end data in the previous packet , and record the length of the cached data at the same time, and use a pointer to indicate the starting position of the data to be processed currently. After the interface library receives the tcp data packet, it extracts the TCP data from the data message and updates the TCP node structure. If the application needs to cache the message, the interface library caches the data in the TCP node by copying the data and moving the pointer. When the next tcp data packet After arriving, the interface library uses the cached data to stitch together the two packets before and after. The invention does not need to cache data in the network card hardware of the TCP unloading system, thereby reducing the cost of the network card hardware.

Description

technical field [0001] The invention relates to the field of network data processing, in particular to a method for realizing TCP connection data caching by combining software and hardware. Background technique [0002] TCP offloading technology is a technology that solidifies the TCP / IP network protocol stack processing in the host software to the network card hardware to reduce the system CPU load and increase the network IO bandwidth. The TCP offloading system generally includes two parts of functions. The first part is TCP connection state management, which uses the TCP connection table to maintain the state of each TCP connection start, data transmission, and close. The second part is TCP data management, which is used to reorder the data of out-of-order TCP packets, extract the data transmitted by TCP and submit it to the host. [0003] Generally, in the TCP offloading system, when the hardware performs TCP data management, a data buffer is generally used in the TCP o...

AI Technical Summary

Problems solved by technology

[0004] In some systems that need to process TCP data in real time, the host not only needs to get the data transmitted by TCP in time, but sometimes also needs to link the data at the end of the previous data packet with the data at the beginning of the next data packet for processing, that is, It is said that part of the data of the previous data packet needs to be cached to the next data packet. If it is cached in the hardware, the hardware needs to consume a large amount of storage

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