.\" Man page generated from reStructuredText.
.
.TH BPFTOOL-FEATURE 8 "" "" ""
.SH NAME
bpftool-feature \- tool for inspection of eBPF-related parameters for Linux kernel or net device
.
.nr rst2man-indent-level 0
.
.de1 rstReportMargin
\\$1 \\n[an-margin]
level \\n[rst2man-indent-level]
level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
-
\\n[rst2man-indent0]
\\n[rst2man-indent1]
\\n[rst2man-indent2]
..
.de1 INDENT
.\" .rstReportMargin pre:
. RS \\$1
. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
. nr rst2man-indent-level +1
.\" .rstReportMargin post:
..
.de UNINDENT
. RE
.\" indent \\n[an-margin]
.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
.nr rst2man-indent-level -1
.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
..
.SH SYNOPSIS
.INDENT 0.0
.INDENT 3.5
\fBbpftool\fP [\fIOPTIONS\fP] \fBfeature\fP \fICOMMAND\fP
.sp
\fIOPTIONS\fP := { { \fB\-j\fP | \fB\-\-json\fP } [{ \fB\-p\fP | \fB\-\-pretty\fP }] }
.sp
\fICOMMANDS\fP := { \fBprobe\fP | \fBhelp\fP }
.UNINDENT
.UNINDENT
.SH FEATURE COMMANDS
.nf
\fBbpftool\fP \fBfeature probe\fP [\fICOMPONENT\fP] [\fBfull\fP] [\fBunprivileged\fP] [\fBmacros\fP [\fBprefix\fP \fIPREFIX\fP]]
\fBbpftool\fP \fBfeature help\fP

\fICOMPONENT\fP := { \fBkernel\fP | \fBdev\fP \fINAME\fP }
.fi
.sp
.SH DESCRIPTION
.INDENT 0.0
.INDENT 3.5
.INDENT 0.0
.TP
.B \fBbpftool feature probe\fP [\fBkernel\fP] [\fBfull\fP] [\fBmacros\fP [\fBprefix\fP \fIPREFIX\fP]]
Probe the running kernel and dump a number of eBPF\-related
parameters, such as availability of the \fBbpf\fP() system call,
JIT status, eBPF program types availability, eBPF helper
functions availability, and more.
.sp
By default, bpftool \fBdoes not run probes\fP for
\fBbpf_probe_write_user\fP() and \fBbpf_trace_printk\fP()
helpers which print warnings to kernel logs. To enable them
and run all probes, the \fBfull\fP keyword should be used.
.sp
If the \fBmacros\fP keyword (but not the \fB\-j\fP option) is
passed, a subset of the output is dumped as a list of
\fB#define\fP macros that are ready to be included in a C
header file, for example. If, additionally, \fBprefix\fP is
used to define a \fIPREFIX\fP, 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.
.sp
Keyword \fBkernel\fP can be omitted. If no probe target is
specified, probing the kernel is the default behaviour.
.sp
When the \fBunprivileged\fP keyword is used, bpftool will dump
only the features available to a user who does not have the
\fBCAP_SYS_ADMIN\fP 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
\fBunprivileged\fP 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.
.TP
.B \fBbpftool feature probe dev\fP \fINAME\fP [\fBfull\fP] [\fBmacros\fP [\fBprefix\fP \fIPREFIX\fP]]
Probe network device for supported eBPF features and dump
results to the console.
.sp
The keywords \fBfull\fP, \fBmacros\fP and \fBprefix\fP have the
same role as when probing the kernel.
.TP
.B \fBbpftool feature help\fP
Print short help message.
.UNINDENT
.UNINDENT
.UNINDENT
.SH OPTIONS
.INDENT 0.0
.INDENT 3.5
.INDENT 0.0
.TP
.B \-h\fP,\fB  \-\-help
Print short help message (similar to \fBbpftool help\fP).
.TP
.B \-V\fP,\fB  \-\-version
Print version number (similar to \fBbpftool version\fP), and optional
features that were included when bpftool was compiled. Optional
features include linking against libbfd to provide the disassembler
for JIT\-ted programs (\fBbpftool prog dump jited\fP) and usage of BPF
skeletons (some features like \fBbpftool prog profile\fP or showing
pids associated to BPF objects may rely on it).
.TP
.B \-j\fP,\fB  \-\-json
Generate JSON output. For commands that cannot produce JSON, this
option has no effect.
.TP
.B \-p\fP,\fB  \-\-pretty
Generate human\-readable JSON output. Implies \fB\-j\fP\&.
.TP
.B \-d\fP,\fB  \-\-debug
Print all logs available, even debug\-level information. This includes
logs from libbpf as well as from the verifier, when attempting to
load programs.
.UNINDENT
.UNINDENT
.UNINDENT
.SH SEE ALSO
.INDENT 0.0
.INDENT 3.5
\fBbpf\fP(2),
\fBbpf\-helpers\fP(7),
\fBbpftool\fP(8),
\fBbpftool\-btf\fP(8),
\fBbpftool\-cgroup\fP(8),
\fBbpftool\-gen\fP(8),
\fBbpftool\-iter\fP(8),
\fBbpftool\-link\fP(8),
\fBbpftool\-map\fP(8),
\fBbpftool\-net\fP(8),
\fBbpftool\-perf\fP(8),
\fBbpftool\-prog\fP(8),
\fBbpftool\-struct_ops\fP(8)
.UNINDENT
.UNINDENT
.\" Generated by docutils manpage writer.
.