| ================= | 
 | BPF Documentation | 
 | ================= | 
 |  | 
 | This directory contains documentation for the BPF (Berkeley Packet | 
 | Filter) facility, with a focus on the extended BPF version (eBPF). | 
 |  | 
 | This kernel side documentation is still work in progress. | 
 | The Cilium project also maintains a `BPF and XDP Reference Guide`_ | 
 | that goes into great technical depth about the BPF Architecture. | 
 |  | 
 | .. toctree:: | 
 |    :maxdepth: 1 | 
 |  | 
 |    verifier | 
 |    libbpf/index | 
 |    standardization/index | 
 |    btf | 
 |    faq | 
 |    syscall_api | 
 |    helpers | 
 |    kfuncs | 
 |    cpumasks | 
 |    programs | 
 |    maps | 
 |    bpf_prog_run | 
 |    classic_vs_extended.rst | 
 |    bpf_iterators | 
 |    bpf_licensing | 
 |    test_debug | 
 |    clang-notes | 
 |    linux-notes | 
 |    other | 
 |    redirect | 
 |  | 
 | .. only::  subproject and html | 
 |  | 
 |    Indices | 
 |    ======= | 
 |  | 
 |    * :ref:`genindex` | 
 |  | 
 | .. Links: | 
 | .. _BPF and XDP Reference Guide: https://docs.cilium.io/en/latest/bpf/ |