Userspace Packet Engine (UPE)

The repository contains two different packet processing engines.

1. Standard Linux Engine

Runs on any Linux system without special hardware. Uses kernel sockets for I/O.

• RX: libpcap reading from interface or PCAP file
• TX: Raw AF_PACKET socket with batching
• Pipeline: One RX thread distributes packets to N worker threads via lock-free SPSC rings
• Workers: Process packets (L3 forwarding, filtering, etc.) and send via TX socket
• Memory: Custom packet pool with 2MB huge pages
• Stats: Separate thread dumps rule counters, latency histograms, and neighbor tables

Docs: docs/ARCHITECTURE.md

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2. DPDK Router Engine

Full kernel bypass. Runs on physical NICs with DPDK PMD drivers.

In progress...

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