From: Michal Rostecki <mrostecki@opensuse.org>
To: bpf@vger.kernel.org
Cc: Michal Rostecki <mrostecki@opensuse.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
Quentin Monnet <quentin.monnet@netronome.com>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Shuah Khan <shuah@kernel.org>,
linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST
FRAMEWORK)
Subject: [PATCH bpf-next v2 3/5] bpftool: Update documentation of "bpftool feature" command
Date: Fri, 21 Feb 2020 04:16:58 +0100 [thread overview]
Message-ID: <20200221031702.25292-4-mrostecki@opensuse.org> (raw)
In-Reply-To: <20200221031702.25292-1-mrostecki@opensuse.org>
Update documentation of "bpftool feature" command with information about
new arguments: "full".
Signed-off-by: Michal Rostecki <mrostecki@opensuse.org>
---
.../bpf/bpftool/Documentation/bpftool-feature.rst | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
index 4d08f35034a2..2e8f66ee1e77 100644
--- 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 emit
+ dmesg warnings. 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
@@ -48,12 +53,12 @@ DESCRIPTION
**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.
--
2.25.0
next prev parent reply other threads:[~2020-02-21 3:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-21 3:16 [PATCH bpf-next v2 0/5] bpftool: Make probes which emit dmesg warnings optional Michal Rostecki
2020-02-21 3:16 ` [PATCH bpf-next v2 1/5] bpftool: Move out sections to separate functions Michal Rostecki
2020-02-21 11:27 ` Quentin Monnet
2020-02-21 3:16 ` [PATCH bpf-next v2 2/5] bpftool: Make probes which emit dmesg warnings optional Michal Rostecki
2020-02-21 11:28 ` Quentin Monnet
2020-02-21 22:44 ` Alexei Starovoitov
2020-02-25 12:18 ` Michal Rostecki
2020-02-21 3:16 ` Michal Rostecki [this message]
2020-02-21 11:28 ` [PATCH bpf-next v2 3/5] bpftool: Update documentation of "bpftool feature" command Quentin Monnet
2020-02-21 3:16 ` [PATCH bpf-next v2 4/5] bpftool: Update bash completion for " Michal Rostecki
2020-02-21 11:29 ` Quentin Monnet
2020-02-21 3:17 ` [PATCH bpf-next v2 5/5] selftests/bpf: Add test " Michal Rostecki
2020-02-21 11:28 ` Quentin Monnet
2020-02-25 13:25 ` Michal Rostecki
2020-02-25 13:55 ` Michal Rostecki
2020-02-25 14:54 ` Quentin Monnet
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