Especially in large software projects like Linux which have contributions from dozens of developers, changes can unexpectedly disrupt related functio

Unit Testing eBPF Programs - by Teodor J. Podobnik

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2024-10-25 19:30:08

Especially in large software projects like Linux which have contributions from dozens of developers, changes can unexpectedly disrupt related functionalities.

The core functionality for unit testing eBPF programs is the BPF_PROG_RUN command, which was previously named BPF_PROG_TEST_RUN and can be used interchangeably.

This command is invoked via the bpf() syscall to execute an eBPF program and return its results to user-space, enabling unit tests with user-supplied context objects.

However, directly invoking the syscall and ensuring all parameters are correctly set can be tedious. To simplify this, libbpf offers the bpf_prog_test_run_opts wrapper, which streamlines the process.

💡libbpf is a C library that provides essential tools and abstractions for loading, managing, and interacting with eBPF programs in the Linux kernel.

The arguments for the bpf_prog_test_run_opts function are an eBPF program file descriptor and a bpf_test_run_opts structure.