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bpftool: Update documentation of "bpftool feature" command

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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
This commit is contained in:
Michal Rostecki 2020-02-26 17:59:37 +01:00 committed by Daniel Borkmann
parent 368cb0e7cd
commit bcdacab6e7
1 changed files with 10 additions and 9 deletions
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19
tools/bpf/bpftool/Documentation/bpftool-feature.rst
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@ -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.