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[2a01:cb08:8160:fc00:8902:d35:9cf3:dd66]) by smtp.gmail.com with ESMTPSA id w17sm8142208wmc.14.2021.12.17.05.52.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Dec 2021 05:52:38 -0800 (PST) Date: Fri, 17 Dec 2021 14:52:37 +0100 From: Paul Chaignon To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Quentin Monnet Subject: [PATCH bpf-next v2 2/2] bpftool: Probe for bounded loop support Message-ID: <9ad43ccea2929be6e94f16f6ee7482ad89524531.1639748569.git.paul@isovalent.com> References: <7dfdf3f93467c619c14c40e957c54b87bb734294.1639748569.git.paul@isovalent.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <7dfdf3f93467c619c14c40e957c54b87bb734294.1639748569.git.paul@isovalent.com> Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net 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 Signed-off-by: Paul Chaignon --- Changes in v2: - Resending to fix a format error. tools/bpf/bpftool/feature.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) 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(); }