diff mbox series

[bpf-next,v2,2/2] bpftool: Probe for bounded loop support

Message ID 9ad43ccea2929be6e94f16f6ee7482ad89524531.1639748569.git.paul@isovalent.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series [bpf-next,v2,1/2] libbpf: Probe for bounded loop support | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Single patches do not need cover letters
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 6 maintainers not CCed: netdev@vger.kernel.org kafai@fb.com songliubraving@fb.com john.fastabend@gmail.com kpsingh@kernel.org yhs@fb.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 25 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next success VM_Test
bpf/vmtest-bpf-next-PR success PR summary

Commit Message

Paul Chaignon Dec. 17, 2021, 1:52 p.m. UTC 
This patch probes for bounded loop support and displays the results as
part of the miscellaneous section, as shown below.

  $ bpftool feature probe | grep loops
  Bounded loop support is available
  $ bpftool feature probe macro | grep LOOPS
  #define HAVE_BOUNDED_LOOPS
  $ bpftool feature probe -j | jq .misc
  {
    "have_large_insn_limit": true,
    "have_bounded_loops": true
  }

Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Paul Chaignon <paul@isovalent.com>
---
Changes in v2:
  - Resending to fix a format error.

 tools/bpf/bpftool/feature.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
index 5397077d0d9e..7aee920162e5 100644
--- a/tools/bpf/bpftool/feature.c
+++ b/tools/bpf/bpftool/feature.c
@@ -654,6 +654,18 @@  probe_large_insn_limit(const char *define_prefix, __u32 ifindex)
 			   res, define_prefix);
 }
 
+static void
+probe_bounded_loops(const char *define_prefix, __u32 ifindex)
+{
+	bool res;
+
+	res = bpf_probe_bounded_loops(ifindex);
+	print_bool_feature("have_bounded_loops",
+			   "Bounded loop support",
+			   "BOUNDED_LOOPS",
+			   res, define_prefix);
+}
+
 static void
 section_system_config(enum probe_component target, const char *define_prefix)
 {
@@ -768,6 +780,7 @@  static void section_misc(const char *define_prefix, __u32 ifindex)
 			    "/*** eBPF misc features ***/",
 			    define_prefix);
 	probe_large_insn_limit(define_prefix, ifindex);
+	probe_bounded_loops(define_prefix, ifindex);
 	print_end_section();
 }