Data transmission method and equipment

Abstract

The invention discloses a data transmission method and data transmission equipment. The method comprises that: when a data packet to be transmitted is determined to be fragmented according to the dimension information of the data packet to be transmitted, an internet protocol (IP) protocol stack fragments the data packet to be transmitted; and the IP protocol stack calls a rapid input / output (RapidIO) driver to transmit the processed fragmented data. In the method, by fragmenting the data packet to be transmitted through the IP protocol stack and transmitting the processed fragmented data through the RapidIO driver, the transmission rate can be improved; the RapidIO message transmission process is responsive transmission and belongs to reliable transmission; and if link congestion occurs, the data can finally reach an opposite terminal.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a data transmission method and equipment. Background technique [0002] The IP (Internet Protocol, Internet Protocol) datagram fragmentation principle in the Ethernet network is specifically: in the IP protocol, due to the limitation of the maximum amount of data that can be carried by the link layer (called the maximum transmission unit MTU), When the size of the sent data payload exceeds the size of the MTU, the data cannot be delivered to the output link as a whole, so the data can be "fragmented" into two or more smaller datagrams, and then sent to the output link These smaller datagrams, called "slices", are sent on the computer. Among them, the slice needs to be reassembled before reaching the transport layer of the destination through the link layer, so that the receiver is located in the TCP (Transmission Control Protocol, Transmission Control Protocol) an...

AI Technical Summary

Problems solved by technology

[0010] In the original Ethernet network, the use of IP protocol and Ethernet frame transmission and reception can complete the transmission of large amounts of data between multiple processors, but it has at least the following problems: (1) The transmission rate is low, and the theoretical transmission rate of the Ethernet controller is only 1Gbit / s, it is difficult to meet the needs of high-speed embedded system interconnection; (2) Ethernet transmission is unreliable, when the network is congested, the switching device will choose to discard part of the Ethernet frame data, resulting in data loss; (3) There is a conflict between the Ethernet controller provided by some chip manufacturers and the SRIO (Serial Rapid IO) controller when sharing hardware resources, which affects the transmission rate and transmission mode of the SRIO controller

Among them, the Rapid IO protocol mainly has two types of transactions, IO mode and MSG (message, message) mode; the IO mode has no limit on the transmission size, but requires the sender to understand the physical memory allocation of the peer, and the maintenance of the send and receive buffers The above two parties must strictly agree that when the number of processors in the network is large and the amount of interaction between them is large, the buffer management is complicated and wasteful, and the flexibility is poor; in MSG mode, the sender does not need to know the peer's The actual physical memory, the receiving end stores the data in the locally planned buffer according to the mailbox and letter number and other information. The maintenance of the sending and receiving buffer is relatively simple, but the transmission size cannot exceed 4K, and it can only be used for small-size data transmission

Therefore, in a large multi-processor mixed network, the above two modes have great limitations

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