Method and device for transmitting and receiving zero-copy network message

Abstract

The invention provides a method and a device for transmitting and receiving zero-copy network messages, and the transmitting method comprises the following steps: using a memory allocation function to continuously apply continuous memories with a special size in a network card driving program until insufficient memory space is left in the network card driving program for application; determining a continuous memory address space from the applied continuous memories; and using the continuous memory address space to transmit network messages. In the transmitting method of the invention, the transmitted data messages are stored in message DMA buffer areas continuously by applying memories in the network card driving program, so network card hardware is not limited by pagesize in performing DMA operation, the network card does not need to adopt an interrupted mode to notify the completion condition of the data message transmitting to the network card driving program, and occupies no CPU resource.

Description

technical field [0001] The present invention relates to the field of sending and receiving zero-copy network messages, in particular to a zero-copy network message sending and receiving method in which the kernel space applies for a continuous memory space that can be mapped to user space as a DMA buffer for sending and receiving messages and device. Background technique [0002] Zero-copy (zero-copy) means that there will be no copy between the memory during the sending and receiving process of a node's network message. When sending, the data packet is sent directly from the user buffer of the application to the external network through the network interface. Chinese patent document CN101150487A discloses a zero-copy network message sending method, including the following steps: A. The application program calls the function provided by the interface library to open the device interface; B. The function to open the device interface applies for a continuous The memory acts a...

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Problems solved by technology

[0005] Aiming at the problem that the memory address needs to be converted during the sending and receiving process of the zero-copy network message in the prior art, the length of the data message is limited by the page size and CPU resources are occupied when the network card hardware performs DMA operation, the purpose of the present invention is to provide A method and device for sending and receiving zero-copy network packets to solve at least one of the above-mentioned problems

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