linux/Documentation/bpf/index.rst
Grant Seltzer f42cfb469f bpf: Add documentation for libbpf including API autogen
This patch is meant to start the initiative to document libbpf.
It includes .rst files which are text documentation describing building,
API naming convention, as well as an index to generated API documentation.

In this approach the generated API documentation is enabled by the kernels
existing kernel documentation system which uses sphinx. The resulting docs
would then be synced to kernel.org/doc

You can test this by running `make htmldocs` and serving the html in
Documentation/output. Since libbpf does not yet have comments in kernel
doc format, see kernel.org/doc/html/latest/doc-guide/kernel-doc.html for
an example so you can test this.

The advantage of this approach is to use the existing sphinx
infrastructure that the kernel has, and have libbpf docs in
the same place as everything else.

The current plan is to have the libbpf mirror sync the generated docs
and version them based on the libbpf releases which are cut on github.

This patch includes the addition of libbpf_api.rst which pulls comment
documentation from header files in libbpf under tools/lib/bpf/. The comment
docs would be of the standard kernel doc format.

Signed-off-by: Grant Seltzer <grantseltzer@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210618140459.9887-2-grantseltzer@gmail.com
2021-06-18 23:06:06 +02:00

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=================
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 main
textual documentation is (for historical reasons) described in
:ref:`networking-filter`, which describe both classical and extended
BPF instruction-set.
The Cilium project also maintains a `BPF and XDP Reference Guide`_
that goes into great technical depth about the BPF Architecture.
libbpf
======
Libbpf is a userspace library for loading and interacting with bpf programs.
.. toctree::
:maxdepth: 1
libbpf/libbpf
libbpf/libbpf_api
libbpf/libbpf_build
libbpf/libbpf_naming_convention
BPF Type Format (BTF)
=====================
.. toctree::
:maxdepth: 1
btf
Frequently asked questions (FAQ)
================================
Two sets of Questions and Answers (Q&A) are maintained.
.. toctree::
:maxdepth: 1
bpf_design_QA
bpf_devel_QA
Syscall API
===========
The primary info for the bpf syscall is available in the `man-pages`_
for `bpf(2)`_. For more information about the userspace API, see
Documentation/userspace-api/ebpf/index.rst.
Helper functions
================
* `bpf-helpers(7)`_ maintains a list of helpers available to eBPF programs.
Program types
=============
.. toctree::
:maxdepth: 1
prog_cgroup_sockopt
prog_cgroup_sysctl
prog_flow_dissector
bpf_lsm
prog_sk_lookup
Map types
=========
.. toctree::
:maxdepth: 1
map_cgroup_storage
Testing and debugging BPF
=========================
.. toctree::
:maxdepth: 1
drgn
s390
Other
=====
.. toctree::
:maxdepth: 1
ringbuf
llvm_reloc
.. Links:
.. _networking-filter: ../networking/filter.rst
.. _man-pages: https://www.kernel.org/doc/man-pages/
.. _bpf(2): https://man7.org/linux/man-pages/man2/bpf.2.html
.. _bpf-helpers(7): https://man7.org/linux/man-pages/man7/bpf-helpers.7.html
.. _BPF and XDP Reference Guide: https://docs.cilium.io/en/latest/bpf/