mirror of https://gitee.com/openkylin/linux.git
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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