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[bpf-next,v2,8/8] bpftool: Add llvm feature to "bpftool version"

Message ID 20220911201451.12368-9-quentin@isovalent.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpftool: Add LLVM as default library for disassembling JIT-ed programs | expand

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Context Check Description
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netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
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: nathan@kernel.org song@kernel.org llvm@lists.linux.dev trix@redhat.com ndesaulniers@google.com martin.lau@linux.dev
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/check_selftest success No net selftest shell script
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, 42 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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bpf/vmtest-bpf-next-VM_Test-8 success Logs for test_maps on x86_64 with llvm-16
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Commit Message

Quentin Monnet Sept. 11, 2022, 8:14 p.m. UTC 
Similarly to "libbfd", add a "llvm" feature to the output of command
"bpftool version" to indicate that LLVM is used for disassembling JIT-ed
programs. This feature is mutually exclusive with "libbfd".

Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Tested-by: Niklas Söderlund <niklas.soderlund@corigine.com>
---
 tools/bpf/bpftool/Documentation/common_options.rst |  8 ++++----
 tools/bpf/bpftool/main.c                           | 10 ++++++++++
 2 files changed, 14 insertions(+), 4 deletions(-)

Comments

Yonghong Song Sept. 20, 2022, 12:03 a.m. UTC | #1 
On 9/11/22 1:14 PM, Quentin Monnet wrote:
> Similarly to "libbfd", add a "llvm" feature to the output of command
> "bpftool version" to indicate that LLVM is used for disassembling JIT-ed
> programs. This feature is mutually exclusive with "libbfd".
> 
> Signed-off-by: Quentin Monnet <quentin@isovalent.com>
> Tested-by: Niklas Söderlund <niklas.soderlund@corigine.com>

Acked-by: Yonghong Song <yhs@fb.com>
diff mbox series

Patch

diff --git a/tools/bpf/bpftool/Documentation/common_options.rst b/tools/bpf/bpftool/Documentation/common_options.rst
index 4107a586b68b..05350a1aadf9 100644
--- a/tools/bpf/bpftool/Documentation/common_options.rst
+++ b/tools/bpf/bpftool/Documentation/common_options.rst
@@ -7,10 +7,10 @@ 
 	  Print bpftool's version number (similar to **bpftool version**), the
 	  number of the libbpf version in use, and optional features that were
 	  included when bpftool was compiled. Optional features include linking
-	  against libbfd to provide the disassembler for JIT-ted programs
-	  (**bpftool prog dump jited**) and usage of BPF skeletons (some
-	  features like **bpftool prog profile** or showing pids associated to
-	  BPF objects may rely on it).
+	  against LLVM or libbfd to provide the disassembler for JIT-ted
+	  programs (**bpftool prog dump jited**) and usage of BPF skeletons
+	  (some features like **bpftool prog profile** or showing pids
+	  associated to BPF objects may rely on it).
 
 -j, --json
 	  Generate JSON output. For commands that cannot produce JSON, this
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index ccd7457f92bf..7e06ca2c5d42 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -89,6 +89,11 @@  static int do_version(int argc, char **argv)
 #else
 	const bool has_libbfd = false;
 #endif
+#ifdef HAVE_LLVM_SUPPORT
+	const bool has_llvm = true;
+#else
+	const bool has_llvm = false;
+#endif
 #ifdef BPFTOOL_WITHOUT_SKELETONS
 	const bool has_skeletons = false;
 #else
@@ -112,6 +117,7 @@  static int do_version(int argc, char **argv)
 		jsonw_name(json_wtr, "features");
 		jsonw_start_object(json_wtr);	/* features */
 		jsonw_bool_field(json_wtr, "libbfd", has_libbfd);
+		jsonw_bool_field(json_wtr, "llvm", has_llvm);
 		jsonw_bool_field(json_wtr, "libbpf_strict", !legacy_libbpf);
 		jsonw_bool_field(json_wtr, "skeletons", has_skeletons);
 		jsonw_end_object(json_wtr);	/* features */
@@ -132,6 +138,10 @@  static int do_version(int argc, char **argv)
 			printf(" libbfd");
 			nb_features++;
 		}
+		if (has_llvm) {
+			printf(" llvm");
+			nb_features++;
+		}
 		if (!legacy_libbpf) {
 			printf("%s libbpf_strict", nb_features++ ? "," : "");
 			nb_features++;