1 files changed, 90 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
new file mode 100644
index 0000000000..e44039f89b
--- /dev/null
+++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
@@ -0,0 +1,90 @@
+.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+===============
+bpftool-feature
+===============
+-------------------------------------------------------------------------------
+tool for inspection of eBPF-related parameters for Linux kernel or net device
+-------------------------------------------------------------------------------
+
+:Manual section: 8
+
+.. include:: substitutions.rst
+
+SYNOPSIS
+========
+
+	**bpftool** [*OPTIONS*] **feature** *COMMAND*
+
+	*OPTIONS* := { |COMMON_OPTIONS| }
+
+	*COMMANDS* := { **probe** | **help** }
+
+FEATURE COMMANDS
+================
+
+|	**bpftool** **feature probe** [*COMPONENT*] [**full**] [**unprivileged**] [**macros** [**prefix** *PREFIX*]]
+|	**bpftool** **feature list_builtins** *GROUP*
+|	**bpftool** **feature help**
+|
+|	*COMPONENT* := { **kernel** | **dev** *NAME* }
+|	*GROUP* := { **prog_types** | **map_types** | **attach_types** | **link_types** | **helpers** }
+
+DESCRIPTION
+===========
+	**bpftool feature probe** [**kernel**] [**full**] [**macros** [**prefix** *PREFIX*]]
+		  Probe the running kernel and dump a number of eBPF-related
+		  parameters, such as availability of the **bpf**\ () system call,
+		  JIT status, eBPF program types availability, eBPF helper
+		  functions availability, and more.
+
+		  By default, bpftool **does not run probes** for
+		  **bpf_probe_write_user**\ () and **bpf_trace_printk**\()
+		  helpers which print warnings to kernel logs. To enable them
+		  and run all probes, the **full** keyword should be used.
+
+		  If the **macros** keyword (but not the **-j** option) is
+		  passed, a subset of the output is dumped as a list of
+		  **#define** macros that are ready to be included in a C
+		  header file, for example. If, additionally, **prefix** is
+		  used to define a *PREFIX*, the provided string will be used
+		  as a prefix to the names of the macros: this can be used to
+		  avoid conflicts on macro names when including the output of
+		  this command as a header file.
+
+		  Keyword **kernel** can be omitted. If no probe target is
+		  specified, probing the kernel is the default behaviour.
+
+		  When the **unprivileged** keyword is used, bpftool will dump
+		  only the features available to a user who does not have the
+		  **CAP_SYS_ADMIN** capability set. The features available in
+		  that case usually represent a small subset of the parameters
+		  supported by the system. Unprivileged users MUST use the
+		  **unprivileged** keyword: This is to avoid misdetection if
+		  bpftool is inadvertently run as non-root, for example. This
+		  keyword is unavailable if bpftool was compiled without
+		  libcap.
+
+	**bpftool feature probe dev** *NAME* [**full**] [**macros** [**prefix** *PREFIX*]]
+		  Probe network device for supported eBPF features and dump
+		  results to the console.
+
+		  The keywords **full**, **macros** and **prefix** have the
+		  same role as when probing the kernel.
+
+	**bpftool feature list_builtins** *GROUP*
+		  List items known to bpftool. These can be BPF program types
+		  (**prog_types**), BPF map types (**map_types**), attach types
+		  (**attach_types**), link types (**link_types**), or BPF helper
+		  functions (**helpers**). The command does not probe the system, but
+		  simply lists the elements that bpftool knows from compilation time,
+		  as provided from libbpf (for all object types) or from the BPF UAPI
+		  header (list of helpers). This can be used in scripts to iterate over
+		  BPF types or helpers.
+
+	**bpftool feature help**
+		  Print short help message.
+
+OPTIONS
+=======
+	.. include:: common_options.rst