CN106789708B

CN106789708B - Multi-channel processing method in TCP/IP (Transmission control protocol/Internet protocol) unloading engine

Info

Publication number: CN106789708B
Application number: CN201611110885.6A
Authority: CN
Inventors: 夏寅星; 阎燕山; 郑燕
Original assignee: No32 Research Institute Of China Electronics Technology Group Corp
Current assignee: No32 Research Institute Of China Electronics Technology Group Corp
Priority date: 2016-12-06
Filing date: 2016-12-06
Publication date: 2020-10-09
Anticipated expiration: 2036-12-06
Also published as: CN106789708A

Abstract

The invention provides a multi-channel processing method in a TCP/IP (Transmission control protocol/Internet protocol) unloading engine, which comprises the following steps of: the method comprises the following steps that firstly, experiments and debugging are carried out through a field programmable gate array FPGA, and a multichannel processing technology in the TOE is realized; step two, integrating the multi-channel processing technology in the TOE into an ASIC chip of the TOE to perform network protocol processing; step three, customizing a software interface, and selecting different channels through a port; step four, in the TCP protocol processing module, the option part of the TCP header is defined in an improved way; and step five, in the handshake stage of TCP connection establishment, during the first handshake, the active requester adds the source channel number, and the destination channel is not distributed and is set to be all zero. The invention can solve the problems of data congestion and connection interruption, greatly improves the working efficiency of the TOE, realizes the function of multi-port TCP connection and data transmission, realizes the high-level protocol of hardware processing TCP/IP protocol, and provides reliable guarantee for data transmission in a high-speed network environment.

Description

Multi-channel processing method in TCP/IP (Transmission control protocol/Internet protocol) unloading engine

Technical Field

The invention relates to the field of computer networks, in particular to a multi-channel processing method in a TCP/IP (transmission control protocol/Internet protocol) unloading engine.

Background

With the increasing development of internet technology, the TCP/IP protocol suite has become a standard network communication protocol. However, in a high-speed network environment, the traditional TCP/IP software protocol stack consumes excessive CPU performance due to the characteristics of context switching overhead and redundant data replication, and reliable data indicates that the current main stream processor cannot meet the performance requirement of protocol processing when the network speed reaches 10 Gbps. The TOE (TCP offload Engine) technology of the hardware device processing protocol is commonly used in server or high-speed network environments. The TCP/IP protocol is divided into an application layer, a transport layer, a network layer and a data link layer from top to bottom in sequence. Compared with the traditional software protocol stack, the TOE technology also incorporates the protocol processing of a transport layer and a network layer into hardware processing so as to improve the processing speed of a data packet. A typical implementation structure of the TOE system is shown in fig. 1, wherein the TOE hardware implementation module mainly processes the main protocols of the transport layer and the network layer, and the most important protocols are ARP protocol, IP protocol, UDP protocol, and TCP protocol.

The TCP protocol is connection-oriented and is handled in the TOE system. The connection needs to be established before the data transmission starts and needs to be disconnected at the end of the transmission. And when receiving and sending data, the protocol processing module will respond to the last data. Meanwhile, in order to keep the smooth of a data channel, the flow control of the data to be transmitted and received is carried out in a sliding window mode. Because the speed of the hardware processing protocol is far higher than that of software, data accumulation at the interface between the software and the hardware can exist, and the congestion problem is caused. Especially when multiple ports establish a TCP connection simultaneously, the failure of hardware to process data in order will result in connection interruption or failure to respond. The connection is simultaneously established by a plurality of ports in a software protocol stack, and the connection can only be processed in series in the hardware realization at present. When the TOE hardware processes the TCP protocol, a plurality of channels are established to manage data storage and connection, so that the transmission efficiency and the data processing speed can be greatly improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a multichannel processing method in a TCP/IP (transmission control protocol/Internet protocol) unloading engine, which can solve the problems of data congestion and connection interruption by adding a multichannel processing technology into a TOE (time of arrival), greatly improve the working efficiency of the TOE, realize the function of multi-port TCP connection and data transmission, realize the high-level protocol of hardware processing TCP/IP protocol and provide reliable guarantee for data transmission in a high-speed network environment.

According to an aspect of the present invention, there is provided a multi-channel processing method in a TCP/IP offload engine, comprising the steps of:

the method comprises the following steps that firstly, experiments and debugging are carried out through a field programmable gate array FPGA, and a multichannel processing technology in the TOE is realized;

step two, integrating the multi-channel processing technology in the TOE into an ASIC chip of the TOE to perform network protocol processing;

step three, customizing a software interface, and selecting different channels through a port;

step four, in the TCP protocol processing module, the option part of the TCP header is defined in an improved way;

step five, in the handshake phase of TCP connection establishment, during the first handshake, the active requester adds the source channel number, and the destination channel is not allocated and is set to be all zero;

step six, if the multichannel technology is not adopted at one end, the channel number is set to be all zero, data come from equipment which does not use the multichannel technology, the data are matched through a source port number and a destination port number of a TCP header, and a TCP protocol processing module puts the data into the channel number according to the identified corresponding storage channel number;

and step seven, when the connection is finished, after the data of the storage channel is completely transmitted, the TCP protocol processing module controls to release the storage space of the channel, and the channel is used for establishing new connection next time.

Preferably, the TCP protocol processing module is capable of performing channel allocation on the transmitted and received data.

Preferably, the multi-channel processing method in the TCP/IP offload engine can perform functions of multi-port TCP connection and data transmission.

Compared with the prior art, the invention has the following beneficial effects: the invention can solve the problems of data congestion and connection interruption by adding a multi-channel processing technology in the TOE, greatly improves the working efficiency of the TOE, realizes the function of multi-port TCP connection and data transmission, realizes the hardware processing of a high-level protocol of a TCP/IP protocol, and provides reliable guarantee for data transmission in a high-speed network environment.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a flow chart of a typical TOE system implementation architecture;

FIG. 2 is a flow chart of the structure of the present invention for implementing the multi-channel technique;

FIG. 3 is a diagram of improved TCP data in accordance with the present invention;

FIG. 4 is a flow chart of an implementation of the FIFO windowing technique of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

As shown in fig. 1 to 4, the present invention provides a multi-channel processing method in a TCP/IP offload engine, which includes the following steps:

in the selection of the channel space, if only a small amount of data is needed to be stored, the requirement can be met by adopting a high-speed SRAM register chip. If a large amount of data is to be realized and the number of channels is large, a storage device can be hung externally to realize a multi-channel technology.

but at the upper layer of software, the processing is generalized, and the method has good compatibility with the current protocol stack processing. That is, if one end is a hardware protocol processing server using the TOE technology and the other end is a terminal using the conventional protocol stack processing, data transmission can be performed normally without any special configuration between them. The technology can be widely applied to network environments of the server, such as cloud services, large-scale data rooms, the Internet of things and other environments with extremely high requirements on network speed.

as shown in fig. 3, a source channel number and a destination channel number are added after the 20-byte general header, each 2 bytes being used to identify the storage channel number of the TCP packet. The channel number can quickly identify the channel space required to store the data packet.

if the multi-channel technology is adopted after the destination end is reached, the channel number is distributed to the connection, the destination channel number of the TCP header of the ack is the source channel number of the request end, and the source channel number is the newly distributed channel number.

As shown in fig. 4, it is implemented in a FIFO (first in first out) manner, and the position of the next read and write is determined by using the sequence number and the acknowledgement number of the TCP header as pointers.

The invention designs a multi-channel TCP connection processing technology in the TOE realization, and realizes the function of multi-port TCP connection and data transmission. Different channels of the whole system adopt different storage spaces, so that data package can be effectively realized. Wherein the TCP protocol processing module can perform channel allocation on the sent and received data. According to the actual situation, the channel number can be set, and the storage space of each channel is distributed, so that the storage space of the channel can be effectively utilized.

The multi-channel processing method in the TCP/IP unloading engine can perform multi-port TCP connection and perform the function of data transmission, so that the data transmission is quicker and more convenient, the processing speed is accelerated, and the time cost is saved.

In the TCP protocol processing module, the option part of the TCP header is defined in an improved way. The 20-byte generic header is followed by the source and destination channel numbers, 2 bytes each, which are used to identify the stored channel number of the TCP packet. The channel number can quickly identify the channel space required to store the data packet. The channel numbers in the different cases function as follows:

in the handshake phase of TCP connection establishment, during the first handshake, the active requester adds the source channel number, and the destination channel is not allocated and is set to all zeros. If the multi-channel technology is adopted after the destination end is reached, the channel number is distributed to the connection, the destination channel number of the TCP header of the ack is the source channel number of the request end, and the source channel number is the newly distributed channel number.

If one end does not adopt the multi-channel technology, the channel number is set to be all zero, data come from equipment which does not use the multi-channel technology, the source port number and the destination port number of the TCP header are matched, and the TCP protocol processing module can identify the corresponding storage channel number and put the data into the storage channel number.

And thirdly, when the connection is finished and the data of the storage channel is completely transmitted, the TCP protocol processing module controls to release the storage space of the channel, and the channel can be used for establishing new connection next time.

The number of the storage channels realized by the invention can be designed according to the actual situation, and more channels mean that more connection number can be realized. But also consumes more memory space, so that space utilization is sufficiently efficient when a balance needs to be made. The size of the memory channel space corresponds to a window size in a hardware implementation. FIFO (first in first out) mode is adopted to realize the method, and the position of next reading and writing is determined by using the serial number and the confirmation number of the TCP header as pointers.

The multi-channel processing technology in the TOE can be used for carrying out experiment and debugging through a Field Programmable Gate Array (FPGA), and then can be integrated into an ASIC chip of the TOE to carry out network protocol processing. In the selection of the channel space, if only a small amount of data is needed to be stored, the requirement can be met by adopting a high-speed SRAM register chip. If a large amount of data is to be realized and the number of channels is large, a storage device can be hung externally to realize a multi-channel technology. The multichannel technology adopted by the invention is mainly used in a TCP protocol processing module, can improve the processing speed of the TOE to the TCP protocol and relieve the congestion phenomenon. The designed TOE chip can be integrated into a network card of a server, so that the high-level protocol of a TCP/IP protocol is systematically processed by hardware, and reliable guarantee is provided for data transmission in a high-speed network environment.

In summary, the present invention provides an implementable design method for hardware processing of multi-channel data according to the content of the TCP protocol, and by adding the multi-channel processing technology to the TOE, the problems of data congestion and connection interruption can be solved, the working efficiency of the TOE is greatly improved, the function of multi-port TCP connection and data transmission is implemented, the high-level protocol of the hardware processing TCP/IP protocol is implemented, and reliable guarantee is provided for data transmission in a high-speed network environment.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims

1. A multi-channel processing method in a TCP/IP offload engine, which is characterized in that the multi-channel processing method in the TCP/IP offload engine comprises the following steps:

step four, in the TCP protocol processing module, the option part of the TCP header is defined in an improved way; adding a source channel number and a destination channel number after the 20-byte general header, wherein each 2 bytes are used for identifying the storage channel number of the TCP packet;

2. The method of claim 1, wherein the TCP protocol processing module performs channel allocation for the transmitted and received data.

3. The method of claim 1, wherein the method of processing multiple channels in a TCP/IP offload engine performs functions of multi-port TCP connection and data transmission.