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bpftool: Add misc section and probe for large INSN limit 

Introduce a new probe section (misc) for probes not related to concrete
map types, program types, functions or kernel configuration. Introduce a
probe for large INSN limit as the first one in that section.

Example outputs:

  # bpftool feature probe
  [...]
  Scanning miscellaneous eBPF features...
  Large program size limit is available

  # bpftool feature probe macros
  [...]
  /*** eBPF misc features ***/
  #define HAVE_HAVE_LARGE_INSN_LIMIT

  # bpftool feature probe -j | jq '.["misc"]'
  {
    "have_large_insn_limit": true
  }

Signed-off-by: Michal Rostecki <mrostecki@opensuse.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Link: https://lore.kernel.org/bpf/20200108162428.25014-3-mrostecki@opensuse.org
alistair/sensors
Michal Rostecki 2020-01-08 17:23:53 +01:00 committed by Daniel Borkmann
parent 5ff0512003
commit 2faef64aa6
1 changed files with 18 additions and 0 deletions
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18
tools/bpf/bpftool/feature.c
View File

@ -572,6 +572,18 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
printf("\n");
}
static void
probe_large_insn_limit(const char *define_prefix, __u32 ifindex)
{
bool res;
res = bpf_probe_large_insn_limit(ifindex);
print_bool_feature("have_large_insn_limit",
"Large program size limit",
"HAVE_LARGE_INSN_LIMIT",
res, define_prefix);
}
static int do_probe(int argc, char **argv)
{
enum probe_component target = COMPONENT_UNSPEC;
@ -724,6 +736,12 @@ static int do_probe(int argc, char **argv)
probe_helpers_for_progtype(i, supported_types[i],
define_prefix, ifindex);
print_end_then_start_section("misc",
"Scanning miscellaneous eBPF features...",
"/*** eBPF misc features ***/",
define_prefix);
probe_large_insn_limit(define_prefix, ifindex);
exit_close_json:
if (json_output) {
/* End current "section" of probes */