Open Source Summit North America 2022

The trend of connected and autonomous vehicles is becoming hot which requires integration of more number of sensors and controllers in the vehicle. This in turn requires proper communication infrastructure which supports bandwidth, latency, reliability and real time data. There are different protocols like CAN, Flexray, LIN, etc. are available but automotive ethernet is emerging to overcome other protocol’s limitations. This session talks about the need of automotive ethernet over other protocols and motivation behind it, how it is different from the normal ethernet and why normal ethernet cannot be used in automotive domain. The session will discuss the detailed overview of automotive ethernet including frame format, types of automotive ethernet and its supported protocols. The session will talk about the current support of automotive ethernet in the Linux like: • Time Sensitive Networking (TSN) using Precision Time Protocol (PTP) • PHY support like 100BASE-T1, 1000BASE-T1 etc. At the end, the discussion on the possible shortfalls and alternatives of automotive Ethernet will be covered.

This BoF provides an open forum for the Embedded Linux community to ask questions and discuss issues with the Yocto Project and OpenEmbedded community. We open with a Yocto Project summary and OpenEmbedded State of the Union.

This talk is partitioned into 4 sections. It starts with a comprehensive Wi-Fi 6 introduction. Also known as high-efficiency Wi-Fi, for the overall improvements targetting dense environments, the former IEEE 802.11ax standard has been ratified early last year. The first part introduces its main concepts which amongst others go by abbreviations like OFDMA, 1024-QAM, 160 MHz channels, MU-MIMO, TWT, and WPA3. Wi-Fi 6E enabling operation of features in the unlicensed 6 GHz band is also covered. The second part looks at the Wi-Fi 6 OpenWrt AP/router landscape. The only officially supported devices are all based on the MediaTek MT7915E chipset while supporting promising Qualcomm IPQ807x resp. Qualcomm QCN5054/QCN9024 based devices is still a work in progress. Wi-Fi 6 clients are covered in the third part with the pre-dominant Intel AX200/201/210 cards, MediaTek MT7921K Wi-Fi 6E, and Qualcomm QCA6391 based clients all running mainline Linux, of course. The last part concludes with a discussion of various real-life configurations and benchmark demo use cases.

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.