Commit 2faef64a authored Jan 08, 2020 by Michal Rostecki Committed by Daniel Borkmann Jan 08, 2020

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

parent 5ff05120

tools/bpf/bpftool/feature.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -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 */

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