Data message processing method from user mode to kernel mode

Abstract

The invention discloses a data message processing method from a user mode to a kernel mode. The method comprises the steps that S1, a virtual network card is created in the kernel mode through a TUN / TAP driving manner; S2, a network card drive is loaded in the user mode, and network interface information in the user mode is sent to the virtual network card; S3, the virtual network card creates virtual interfaces according to the network interface information in the user mode, wherein the number and the state of the virtual interfaces are kept consistent with those of a network interface in the user mode; S4, when receiving a message needing to be processed by the kernel mode, the network interface in the user mode sends the message needing to be processed by the kernel mode to the virtual network card, and the virtual network card sends the message needing to be processed by the kernel mode to the kernel mode for processing. The method can be used for eliminating performance loss caused by loading a kernel network card drive and enabling the kernel mode to perceive the states of an actual physical network and a network interface.

Description

technical field [0001] The invention relates to the technical field of message processing, in particular to a data message processing method from a user state to a kernel state. Background technique [0002] When a host sends, receives, and processes network packets, it usually adopts two methods: [0003] One is to load the network card driver by the kernel to send and receive messages, and copy the data to the user mode process for business processing; [0004] The other is to load the network card driver in the user mode to send and receive messages. For the host messages that need to be forwarded to the kernel for processing, create a special socket through the socket or create a file through the proc file system to realize data interaction with the kernel. [0005] The disadvantage of the first method is that: the kernel loads the network card driver to send and receive messages, which will cause a large number of interruptions under the impact of the large traffic of ...

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Problems solved by technology

[0005] The disadvantage of the first method is that: the kernel loads the network card driver to send and receive messages, which will cause a large number of interruptions under the impact of the large traffic of the 10 Gigabit network card, which will consume a certain amount of CPU performance (especially the X86 architecture). At the same time, the kernel of the Linux operating system The data copy from the user state to the user state will also cause the loss of system performance;

[0006] The disadvantage of the second method is that: the user mode loads the network card driver to send and receive packets, although the performance loss is reduced, but for some host packet business processing (such as PPPoE, DHCP, etc. of the Linux kernel), it is necessary to perceive the actual physical network and network interface. state, and the kernel does not have a network interface to perceive the operation, then there will be a problem, and it also involves the conversion of the user mode message PKB and the kernel SKB format

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