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libbpf has three levels of priority for output messages: warn, info, debug. By default, debug output is not printed to the console. Add a new "--debug" (short name: "-d") option to bpftool to print libbpf logs for all three levels. Internally, we simply use the function provided by libbpf to replace the default printing function by one that prints logs regardless of their level. v2: - Remove the possibility to select the log-levels to use (v1 offered a combination of "warn", "info" and "debug"). - Rename option and offer a short name: -d|--debug. - Add option description to all bpftool manual pages (instead of bpftool-prog.rst only), as all commands use libbpf. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
91 lines
2.7 KiB
ReStructuredText
91 lines
2.7 KiB
ReStructuredText
===============
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bpftool-feature
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===============
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-------------------------------------------------------------------------------
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tool for inspection of eBPF-related parameters for Linux kernel or net device
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-------------------------------------------------------------------------------
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:Manual section: 8
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SYNOPSIS
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========
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**bpftool** [*OPTIONS*] **feature** *COMMAND*
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*OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] }
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*COMMANDS* := { **probe** | **help** }
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FEATURE COMMANDS
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================
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| **bpftool** **feature probe** [*COMPONENT*] [**macros** [**prefix** *PREFIX*]]
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| **bpftool** **feature help**
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| *COMPONENT* := { **kernel** | **dev** *NAME* }
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DESCRIPTION
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===========
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**bpftool feature probe** [**kernel**] [**macros** [**prefix** *PREFIX*]]
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Probe the running kernel and dump a number of eBPF-related
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parameters, such as availability of the **bpf()** system call,
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JIT status, eBPF program types availability, eBPF helper
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functions availability, and more.
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If the **macros** keyword (but not the **-j** option) is
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passed, a subset of the output is dumped as a list of
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**#define** macros that are ready to be included in a C
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header file, for example. If, additionally, **prefix** is
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used to define a *PREFIX*, the provided string will be used
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as a prefix to the names of the macros: this can be used to
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avoid conflicts on macro names when including the output of
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this command as a header file.
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Keyword **kernel** can be omitted. If no probe target is
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specified, probing the kernel is the default behaviour.
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Note that when probed, some eBPF helpers (e.g.
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**bpf_trace_printk**\ () or **bpf_probe_write_user**\ ()) may
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print warnings to kernel logs.
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**bpftool feature probe dev** *NAME* [**macros** [**prefix** *PREFIX*]]
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Probe network device for supported eBPF features and dump
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results to the console.
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The two keywords **macros** and **prefix** have the same
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role as when probing the kernel.
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**bpftool feature help**
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Print short help message.
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OPTIONS
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=======
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-h, --help
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Print short generic help message (similar to **bpftool help**).
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-V, --version
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Print version number (similar to **bpftool version**).
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-j, --json
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Generate JSON output. For commands that cannot produce JSON, this
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option has no effect.
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-p, --pretty
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Generate human-readable JSON output. Implies **-j**.
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-d, --debug
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Print all logs available from libbpf, including debug-level
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information.
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SEE ALSO
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========
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**bpf**\ (2),
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**bpf-helpers**\ (7),
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**bpftool**\ (8),
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**bpftool-prog**\ (8),
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**bpftool-map**\ (8),
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**bpftool-cgroup**\ (8),
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**bpftool-net**\ (8),
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**bpftool-perf**\ (8),
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**bpftool-btf**\ (8)
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