bpftool: Update documentation of "bpftool feature" command

Update documentation of "bpftool feature" command with information about
new arguments: "full".

Signed-off-by: Michal Rostecki <mrostecki@opensuse.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20200226165941.6379-4-mrostecki@opensuse.org

diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
index 4d08f35..b04156c 100644 (file)
--- a/tools/bpf/bpftool/Documentation/bpftool-feature.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
@@ -19,19 +19,24 @@ SYNOPSIS
 FEATURE COMMANDS
 ================
 
-|      **bpftool** **feature probe** [*COMPONENT*] [**macros** [**prefix** *PREFIX*]]
+|      **bpftool** **feature probe** [*COMPONENT*] [**full**] [**macros** [**prefix** *PREFIX*]]
 |      **bpftool** **feature help**
 |
 |      *COMPONENT* := { **kernel** | **dev** *NAME* }
 
 DESCRIPTION
 ===========
-       **bpftool feature probe** [**kernel**] [**macros** [**prefix** *PREFIX*]]
+       **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
@@ -44,16 +49,12 @@ DESCRIPTION
                  Keyword **kernel** can be omitted. If no probe target is
                  specified, probing the kernel is the default behaviour.
 
-                 Note that when probed, some eBPF helpers (e.g.
-                 **bpf_trace_printk**\ () or **bpf_probe_write_user**\ ()) may
-                 print warnings to kernel logs.
-
-       **bpftool feature probe dev** *NAME* [**macros** [**prefix** *PREFIX*]]
+       **bpftool feature probe dev** *NAME* [**full**] [**macros** [**prefix** *PREFIX*]]
                  Probe network device for supported eBPF features and dump
                  results to the console.
 
-                 The two keywords **macros** and **prefix** have the same
-                 role as when probing the kernel.
+                 The keywords **full**, **macros** and **prefix** have the
+                 same role as when probing the kernel.
 
        **bpftool feature help**
                  Print short help message.