BPFTOOL-FEATURE(8)                                          BPFTOOL-FEATURE(8)

       bpftool-feature - tool for inspection of eBPF-related parameters for
       Linux kernel or net device

          bpftool [OPTIONS] feature COMMAND

          OPTIONS := { { -j | --json } [{ -p | --pretty }] }

          COMMANDS := { probe | help }

       bpftool feature probe [COMPONENT] [macros [prefix PREFIX]]
       bpftool feature help

       COMPONENT := { kernel | dev NAME }

          bpftool feature probe [kernel] [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.

                 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 header file, for
                 example. If, additionally, prefix is used to define a PREFIX,
                 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

                 Keyword kernel can be omitted. If no probe target is
                 specified, probing the kernel is the default behaviour.

                 Note that when probed, some eBPF helpers (e.g.
                 bpf_trace_printk() or bpf_probe_write_user()) may print
                 warnings to kernel logs.

          bpftool feature probe dev NAME [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.

          bpftool feature help
                 Print short help message.

          -h, --help
                 Print short generic help message (similar to bpftool help).

          -V, --version
                 Print version number (similar to bpftool version).

          -j, --json
                 Generate JSON output. For commands that cannot produce JSON,
                 this option has no effect.

          -p, --pretty
                 Generate human-readable JSON output. Implies -j.

          -d, --debug
                 Print all logs available from libbpf, including debug-level

          bpf(2), bpf-helpers(7), bpftool(8), bpftool-prog(8), bpftool-map(8),
          bpftool-cgroup(8), bpftool-net(8), bpftool-perf(8), bpftool-btf(8)