c07ba629df
All bpftool commands support the options for JSON output and debug from libbpf. In addition, some commands support additional options corresponding to specific use cases. The list of options described in the man pages for the different commands are not always accurate. The messages for interactive help are mostly limited to HELP_SPEC_OPTIONS, and are even less representative of the actual set of options supported for the commands. Let's update the lists: - HELP_SPEC_OPTIONS is modified to contain the "default" options (JSON and debug), and to be extensible (no ending curly bracket). - All commands use HELP_SPEC_OPTIONS in their help message, and then complete the list with their specific options. - The lists of options in the man pages are updated. - The formatting of the list for bpftool.rst is adjusted to match formatting for the other man pages. This is for consistency, and also because it will be helpful in a future patch to automatically check that the files are synchronised. Signed-off-by: Quentin Monnet <quentin@isovalent.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210730215435.7095-5-quentin@isovalent.com
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===============
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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** }] | { **-d** | **--debug** } }
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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*] [**full**] [**unprivileged**] [**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**] [**full**] [**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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By default, bpftool **does not run probes** for
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**bpf_probe_write_user**\ () and **bpf_trace_printk**\()
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helpers which print warnings to kernel logs. To enable them
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and run all probes, the **full** keyword should be used.
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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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When the **unprivileged** keyword is used, bpftool will dump
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only the features available to a user who does not have the
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**CAP_SYS_ADMIN** capability set. The features available in
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that case usually represent a small subset of the parameters
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supported by the system. Unprivileged users MUST use the
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**unprivileged** keyword: This is to avoid misdetection if
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bpftool is inadvertently run as non-root, for example. This
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keyword is unavailable if bpftool was compiled without
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libcap.
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**bpftool feature probe dev** *NAME* [**full**] [**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 keywords **full**, **macros** and **prefix** have the
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same 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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.. include:: common_options.rst
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