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0x17: BoF, CXL : An overview and applicability to high performance networking
by Jamal Hadi Salim 27 Sep '23

27 Sep '23

If you have not heard of the new 3 letter acronym, CXL(Compute eXpress Link), you will hear a lot more about it in the future. For the uninformed, CXL is an open standard for high-speed, high capacity CPU-to-device and CPU-to-memory connections. At 0x17, Shrijeet Mukherjee will lead a BOF on CXL and it's applicability to networking. Merging the IO and Compute expansion protocols has always been a desired attribute as it allows dis-aggregation of the memory capacity from the compute capacity, and specifically for networking it allows buffer and control state placement to be moved closer to IO and offload devices. If you would like to speak at this BoF on topics covering the state of the art of CXL and the platforms that support it or talk about innovative solutions that CXL enables please reach out to Shrijeet. cheers, jama

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0x17: Rust for Linux Networking Tutorial
by Jamal Hadi Salim 26 Sep '23

26 Sep '23

So you've heard of Rust and you have heard, while walking around the grape vine, about Rust for Linux. You are a hardcore linux kernel hacker and you love your C. You scratch your head as you wonder why in the world would anyone need another language! But at the same time you cant stand all those annoying pesty syzkaller bug reports or CVEs on your code - they take away all the fun. Rust has a key property that makes it very interesting as the second language in the kernel: it guarantees no undefined behavior takes place (as long as unsafe code is sound). This includes no use-after-free mistakes, no double frees, no data races, etc. It also provides other important benefits, such as improved error handling, stricter typing, sum types, pattern matching, privacy, closures, generics, etc. In this tutorial two of the gurus in Rust for Linux, Wedson Almeida Filho and Miguel Ojeda will guide us through a practical example which will use an example of kernel networking code. The sample code is first written in C and then migrated to Rust. Wedson and Miguel will then do a step-by-step walk of the Rust incarnation of the code, explaining how the language works at a high-level and well as giving practical tips to get started with Rust for networking in the kernel. Our esteemed guides will show us how Rust prevents some of the mistakes that could happen in the C version, some of which could become vulnerabilities exploited by bad operators or that pesky syzkaller. There is no prerequisite Rust knowledge needed for this tutorial. cheers, jamal

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0x17: Workshop, Artificial Intelligence and Machine Learning in Networking
by Jamal Hadi Salim 25 Sep '23

25 Sep '23

Ok, so you are a networking Linux person and you are trying to wade your way around all this ML and AI hype. ChatGTP is just not helping make you feel better. Sigh. All the relatives and friends are telling you how this is the future and worse you feel left out..... Well, fear no more. Our chairs Marta Plantykow and Roopa Prabhu have a plan to get you on good footing. The current agenda includes the following topics (more could be added later): 1) A tutorial by Marta Plantykow "Bridging networking and AI: Empowering Networking Engineers with Artificial Intelligence": The tutorial will be an overview of the fundamental concepts of AI/ML and their relevance to networking. Through relatable examples and approachable explanations, attendees will better understand how AI can enhance networking. While the discourse maintains a high-level perspective, it aims to demystify the notion that AI is overly complex and inaccessible. 2) Roopa Prabhu will discuss LLM's and generative AI in Network operations and Cyber-security 3) Milena Olech , Marta Plantykow and Maciek Machnikowski will talk about "Genetic Algorithm based PI controller tuning with stability analysis for Linux ptp4l optimization" which continues their work for tuning the Proportional-Integral (PI) controller configurable in the phc2sys application using Genetic Algorithm presented on Netdev 0x15[1]. More details on this workshop can be found at: https://netdevconf.info/0x17/sessions/workshop/artificial-intelligence-and-… cheers, jamal [1] https://netdevconf.info/0x15/session.html?Precision-Time-Protocol-optimizat…

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0x17: BoF, My foo is just way better!
by Jamal Hadi Salim 25 Sep '23

25 Sep '23

This is an informal fun BoF! The idea is to give someone the stage for 10-15 minutes to demonstrate how they do kernel development and debugging. Since there are so many different approaches out there - ranging from people still debugging on baremetal to uml, to variants of VMs etc - i am sure we'll see crazies.. and maybe we'll finally get the answer to: Who is the prettiest of them all? Show up so we can throw some fruit at you or maybe share a fruit with you ;-> Remote users allowed too. Ping me if you want to participate... cheers, jamal

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0x17: XDP workshop
by Jamal Hadi Salim 23 Sep '23

23 Sep '23

Aleksander Łobakin et al will chair the classical XDP workshop. XDP metadata is the main agenda discussion item, but more items will be added over time. Please reach out to the chairs if you want to add other discussion items. cheers, jamal

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0x17: Tutorial, Lightweight Approach to Kickstart Development of a NIC Driver
by Jamal Hadi Salim 22 Sep '23

22 Sep '23

So your NIC hardware is not ready but you need to write the driver.... In this tutorial, David Ahern will guide us to a lightweight approach for developing S/W and H/W in parallel. As H/W design discussions progress, a simplified software model can be built in parallel, capturing the essence of the data pipeline and descriptors. When run with the Linux networking stack, design proposals can be examined from a S/W perspective with actual data based on a networking load. David will show how to integrate a S/W only device model with Linux and the networking stack - from mimicking PCI probe and init, creating a netdevice, configuring queues and using those queues to send and receive data. Namespaces are used to imitate hosts and allow end-to-end connectivity, facilitating a complete, closed-loop datapath cheers, jamal

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0x17: Reminder, Early bird registration still on
by Jamal Hadi Salim 21 Sep '23

21 Sep '23

Folks, A reminder that early bird registration is open for another 9 days. https://netdevconf.info/0x17/pages/registration.html The earlier you register the better for us as an organizing committee in terms of planning (we have to feed you for example and the caterers tend to be mean when you change the numbers on them ;->). So register sooner than later please! cheers, jamal

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0x17: Tutorial, Introduction to time synchronization pt. 3
by Jamal Hadi Salim 21 Sep '23

21 Sep '23

Maciej Machnikowski is back for the trilogy on time synchronization! Our esteemed instructor, Maciej, builds on his previous two sessions[1][2] to teach us more on this important topic. In this session he will discuss the latest advancements in linuxptp 4.0, such as dynamic clock reconfiguration in ts2phc or support for virtual clocks in the tool and the Linux Kernel. The tutorial will go into the fundamental concepts of Precision Time Measurement (PTM), which offers a pathway to enhance the synchronization of time between the Network Interface Card (NIC) and the Central Processing Unit (CPU), and briefly introduce kernel APIs dedicated to supporting it. Maciej will segway into a discussion about practical techniques for effectively monitoring a PTP-synchronized system and conducting tests on a PTP Hardware Clock (PHC) through the utilization of diverse tools. Notably, tools like "phc_ctl" and "testptp" offer distinct capabilities. And finally this tutorial will conclude with a practical example of deploying ptp4l and phc2sys in combination with chronyd or ntpd to synchronize the system clock to NTP and PTP time sources using a timemaster tool. cheers, jamal 1. https://netdevconf.info/0x15/session.html?Introduction-to-time-synchronizat… 2. https://netdevconf.info/0x16/sessions/talk/introduction-to-time-synchroniza…

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0x17: FRR workshop
by Jamal Hadi Salim 20 Sep '23

20 Sep '23

Donald Sharp will chair the classical FRR workshop. Current agenda includes: - Recent Scale/Memory optimizations for BGP - Conversion of BGP bestpath and multipath processing and relation to Nexthop Group Integration - Zebra changes to further accommodate the separation of the data plane. - Recent releases and what people would like to see from FRR itself in the future Reminder: Early bird rates for registration are still on! cheers, jamal

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0x17: TLS handshake for in-kernel consumers BoF
by Jamal Hadi Salim 19 Sep '23

19 Sep '23

Chuck Lever will chair the TLS handshake for in-kernel consumers BoF. Current agenda includes discussions on: - Why kernel consumers want TLS handshake - Alternative approaches to providing TLS handshake in the kernel - The netlink upcall and the user space agent implemented - Thoughts on the use of TPM, NIC offload, keyrings, and other technologies Of course not to forget that the BoF will include open discussions, questions, and possibly rotten projectiles (only soft fruits allowed!) cheers, jamal

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