基于PCI+Express 2.0的高速网卡中DMA的设计  

The Design of DMA In High Speed NIC Based on PCI Express 2.0

作　　者：郑凯 ZHENG Kai(School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huaian Jiangsu, 223300, China)

机构地区：[1]淮阴师范学院物理与电子电气工程学院,江苏淮安223300

出　　处：《软件》2017年第8期204-209,共6页Software

摘　　要：PCIE总线已经成为高带宽网卡与计算机通信的主流总线。而DMA控制器是实现PCIE总线高带宽应用的关键因素。本文详细阐述了基于PCIE接口的网卡中DMA引擎的接收和发送数据过程,介绍了描述符机制。本文提出了基于PCIE接口的网卡DMA的设计方案,并详细说明了其中的实现难点和各子模块的功能。本文还提出了影响DMA性能的主要因素和改进方向。PCI Express bus has become the mainstream bus applied communication between high-bandwidth NIC and computer.DMA controllor is a key element to achieve high bandwidth utilization for a PCI Express application.This paper describes the descriptor mechanism and the processes of receiving and sending data packets of the DMA.This paper proposes a design architecture to implement DMA in NIC based on PCI Express.The paper also raises the main factors and the direction of the DMA improving performance.

关 键 词：网卡 DMA机制 PCIEXPRESS 

分 类 号：TP334.7[自动化与计算机技术—计算机系统结构]