BPF: Introduction, Programming Tips and Tricks
Explore the world of Berkeley Packet Filter (BPF) in this informative 32-minute conference talk from KubeCon + CloudNativeCon Europe 2022. Delve into the past, present, and future of BPF, a crucial subsystem in the Linux kernel widely used for tracing, networking, and security. Learn how BPF safely and efficiently extends kernel capabilities without modifying source code or loading kernel modules. Discover practical programming tips and tricks for developing BPF tools using the libbpf library. Gain insights into BPF CO-RE, creating a "Hello world" example, understanding BPF skeleton and app lifecycle, and mastering advanced techniques such as selective attachment, custom loading, and handling multiple events. Explore methods for reading kernel structure fields, dealing with API changes, and optimizing performance through global variables and map pre-allocation strategies.