嵌入式系统中KSZ8851-32MLL的网络风暴影响及自恢复机制研究

Research on Network Storm Impact and Self-Recovery Mechanism of KSZ8851-32MLL in Embedded Systems

摘要:

针对KSZ8851-32MLL百兆以太网控制器在嵌入式系统中面临网络风暴威胁的问题,对芯片在极端网络条件下的可靠性进行了系统研究。通过网络测试仪对KSZ8851- 32MLL嵌入式系统进行网络风暴测试,发现广播网络风暴工况下出现网络数据发送异常现象,经分析判定与芯片流量控制机制及潜在设计缺陷相关。采用了关闭流量控制功能、优化驱动程序增加缓冲区余量检测与芯片快速自恢复机制的关键技术,以发送缓冲区余量作为异常检测指标实现故障自恢复。经实验测试实现了错误帧清零,彻底消除发送阻塞现象,在持续高强度广播风暴下网络功能可快速自恢复,满足了工业控制等嵌入式场景对高可靠性和实时性的工程应用需求。

Abstract:

A systematic study was conducted on the reliability of the KSZ8851-32MLL Fast Ethernet controller under extreme network conditions to address the threat of network storms in embedded systems. Through network storm testing of the KSZ8851-32MLL embedded system using a network tester, abnormal network data transmission phenomena were observed under broadcast storm conditions, which were determined to be related to the chip"s flow control mechanism and potential design defects upon analysis. Key technologies were adopted including disabling flow control functions, optimizing driver programs with buffer margin detection, and implementing a fast chip self-recovery mechanism, using transmit buffer margin as an anomaly detection indicator to achieve fault self-recovery. Experimental testing achieved zero error frames, completely eliminated transmission blocking phenomena, enabled rapid self-recovery of network functions under sustained high-intensity broadcast storms, and satisfied the engineering application requirements for high reliability and real-time performance in industrial control and other embedded scenarios.