Open Source Summit North America 2022

As the next generation automotive networks requires more bandwidth to connect more computing resources, it was only natural to turn to Ethernet. Though network has high bandwidth support and high transmission rate, it is important to debug issue and tune the network interface to improve the throughput of network. If you want to tune your network interface card for hardware specific customization, then ethtool can be your best friend. Features such as interrupt coalesce settings, ring buffer information, flow control changes, offload processing can be tuned using ethtool. Ethtool can be used to manage segmentation offload and also provides an interface to implement customized commands, where the end user can utilize to access HW specific features from the userspace. In order to ease debugging effort, many automotive ethernet controllers provide HW Management Counters to identify most of the communication errors and status of transfer. This session potrays the implementation of debugfs based utility to access management counters. The presentation takes up DesignWare EQoS controller's MAC Management counter (MMC) to showcase the functionality of debugfs framework. This talk also highlights the portability of debugfs framework into ethtool utility for better userspace accessibility.