This tutorial guides developers through the process of implementing a simple XDP (eXpress Data Path) load balancer using eBPF (Extended Berkeley Packet Filter). The project leverages the Linux kernel's capabilities to create a highly efficient network application. The code defines a load balancer that listens for incoming network packets, calculates a hash based on the packet's source IP and port, and forwards the packet to the appropriate backend server. The XDP program logic includes initial checks for Ethernet frames, IP packets, and TCP protocol, and it handles packets from clients and backends differently. The userspace code parses command line arguments for backend configuration and sets up the load balancer.
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