Architecting eBPF Kernel Socket Filters (1313)

Technical Overview

Engineering breakdown of Architecting eBPF Kernel Socket Filters (1313). Bare-metal hardware performance requires isolated kernel parameters, zero-copy packet steering, and deterministic latency budgets. This guide walks through the complete lifecycle: from BPF bytecode verification through JIT compilation to production-grade socket filter deployment.

Core Architecture Pillars

• XDP Early Drop: Process packets at NIC driver level before skb allocation.
• Sockmap/Sockhash: Redirect traffic to userspace sockets without kernel bypass overhead.
• BPF Tail Calls: Chain filter logic programmatically, avoiding linear probe limits.
• BTF-Enabled CO-RE: Compile Once, Run Everywhere across kernel versions 5.4+.

We'll examine a real-world deployment at Votion Cloud where this architecture reduced p99 latency by 42% and CPU cycles/packet by 3.1x compared to nftables.