Provided by: linux-tools-common_5.4.0-26.30_all bug

NAME

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

SYNOPSIS

          bpftool [OPTIONS] feature COMMAND

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

          COMMANDS := { probe | help }

FEATURE COMMANDS

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

       COMPONENT := { kernel | dev NAME }

DESCRIPTION

          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 file.

                 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.

OPTIONS

          -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 information.

SEE ALSO

          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)

                                                                               BPFTOOL-FEATURE(8)