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-.. SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
-
-libbpf API naming convention
-============================
-
-libbpf API provides access to a few logically separated groups of
-functions and types. Every group has its own naming convention
-described here. It's recommended to follow these conventions whenever a
-new function or type is added to keep libbpf API clean and consistent.
-
-All types and functions provided by libbpf API should have one of the
-following prefixes: ``bpf_``, ``btf_``, ``libbpf_``, ``xsk_``,
-``perf_buffer_``.
-
-System call wrappers
---------------------
-
-System call wrappers are simple wrappers for commands supported by
-sys_bpf system call. These wrappers should go to ``bpf.h`` header file
-and map one-on-one to corresponding commands.
-
-For example ``bpf_map_lookup_elem`` wraps ``BPF_MAP_LOOKUP_ELEM``
-command of sys_bpf, ``bpf_prog_attach`` wraps ``BPF_PROG_ATTACH``, etc.
-
-Objects
--------
-
-Another class of types and functions provided by libbpf API is "objects"
-and functions to work with them. Objects are high-level abstractions
-such as BPF program or BPF map. They're represented by corresponding
-structures such as ``struct bpf_object``, ``struct bpf_program``,
-``struct bpf_map``, etc.
-
-Structures are forward declared and access to their fields should be
-provided via corresponding getters and setters rather than directly.
-
-These objects are associated with corresponding parts of ELF object that
-contains compiled BPF programs.
-
-For example ``struct bpf_object`` represents ELF object itself created
-from an ELF file or from a buffer, ``struct bpf_program`` represents a
-program in ELF object and ``struct bpf_map`` is a map.
-
-Functions that work with an object have names built from object name,
-double underscore and part that describes function purpose.
-
-For example ``bpf_object__open`` consists of the name of corresponding
-object, ``bpf_object``, double underscore and ``open`` that defines the
-purpose of the function to open ELF file and create ``bpf_object`` from
-it.
-
-Another example: ``bpf_program__load`` is named for corresponding
-object, ``bpf_program``, that is separated from other part of the name
-by double underscore.
-
-All objects and corresponding functions other than BTF related should go
-to ``libbpf.h``. BTF types and functions should go to ``btf.h``.
-
-Auxiliary functions
--------------------
-
-Auxiliary functions and types that don't fit well in any of categories
-described above should have ``libbpf_`` prefix, e.g.
-``libbpf_get_error`` or ``libbpf_prog_type_by_name``.
-
-AF_XDP functions
--------------------
-
-AF_XDP functions should have an ``xsk_`` prefix, e.g.
-``xsk_umem__get_data`` or ``xsk_umem__create``. The interface consists
-of both low-level ring access functions and high-level configuration
-functions. These can be mixed and matched. Note that these functions
-are not reentrant for performance reasons.
-
-Please take a look at Documentation/networking/af_xdp.rst in the Linux
-kernel source tree on how to use XDP sockets and for some common
-mistakes in case you do not get any traffic up to user space.
-
-libbpf ABI
-==========
-
-libbpf can be both linked statically or used as DSO. To avoid possible
-conflicts with other libraries an application is linked with, all
-non-static libbpf symbols should have one of the prefixes mentioned in
-API documentation above. See API naming convention to choose the right
-name for a new symbol.
-
-Symbol visibility
------------------
-
-libbpf follow the model when all global symbols have visibility "hidden"
-by default and to make a symbol visible it has to be explicitly
-attributed with ``LIBBPF_API`` macro. For example:
-
-.. code-block:: c
-
-        LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
-
-This prevents from accidentally exporting a symbol, that is not supposed
-to be a part of ABI what, in turn, improves both libbpf developer- and
-user-experiences.
-
-ABI versionning
----------------
-
-To make future ABI extensions possible libbpf ABI is versioned.
-Versioning is implemented by ``libbpf.map`` version script that is
-passed to linker.
-
-Version name is ``LIBBPF_`` prefix + three-component numeric version,
-starting from ``0.0.1``.
-
-Every time ABI is being changed, e.g. because a new symbol is added or
-semantic of existing symbol is changed, ABI version should be bumped.
-This bump in ABI version is at most once per kernel development cycle.
-
-For example, if current state of ``libbpf.map`` is:
-
-.. code-block::
-        LIBBPF_0.0.1 {
-        	global:
-                        bpf_func_a;
-                        bpf_func_b;
-        	local:
-        		\*;
-        };
-
-, and a new symbol ``bpf_func_c`` is being introduced, then
-``libbpf.map`` should be changed like this:
-
-.. code-block::
-        LIBBPF_0.0.1 {
-        	global:
-                        bpf_func_a;
-                        bpf_func_b;
-        	local:
-        		\*;
-        };
-        LIBBPF_0.0.2 {
-                global:
-                        bpf_func_c;
-        } LIBBPF_0.0.1;
-
-, where new version ``LIBBPF_0.0.2`` depends on the previous
-``LIBBPF_0.0.1``.
-
-Format of version script and ways to handle ABI changes, including
-incompatible ones, described in details in [1].
-
-Stand-alone build
-=================
-
-Under https://github.com/libbpf/libbpf there is a (semi-)automated
-mirror of the mainline's version of libbpf for a stand-alone build.
-
-However, all changes to libbpf's code base must be upstreamed through
-the mainline kernel tree.
-
-License
-=======
-
-libbpf is dual-licensed under LGPL 2.1 and BSD 2-Clause.
-
-Links
-=====
-
-[1] https://www.akkadia.org/drepper/dsohowto.pdf
-    (Chapter 3. Maintaining APIs and ABIs).
