Thread (33 messages) 33 messages, 4 authors, 18d ago

[PATCHv8 bpf-next 18/29] libbpf: Add bpf_link_create support for tracing_multi link

From: Jiri Olsa <jolsa@kernel.org>
Date: 2026-06-06 12:43:02
Also in: bpf
Subsystem: bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds

Adding bpf_link_create support for tracing_multi link with
new tracing_multi record in struct bpf_link_create_opts.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/lib/bpf/bpf.c | 9 +++++++++
 tools/lib/bpf/bpf.h | 5 +++++
 2 files changed, 14 insertions(+)
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index bc513aa8f404..f37e3416f61a 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -845,6 +845,15 @@ int bpf_link_create(int prog_fd, int target_fd,
 		if (!OPTS_ZEROED(opts, uprobe_multi))
 			return libbpf_err(-EINVAL);
 		break;
+	case BPF_TRACE_FENTRY_MULTI:
+	case BPF_TRACE_FEXIT_MULTI:
+	case BPF_TRACE_FSESSION_MULTI:
+		attr.link_create.tracing_multi.ids = ptr_to_u64(OPTS_GET(opts, tracing_multi.ids, 0));
+		attr.link_create.tracing_multi.cookies = ptr_to_u64(OPTS_GET(opts, tracing_multi.cookies, 0));
+		attr.link_create.tracing_multi.cnt = OPTS_GET(opts, tracing_multi.cnt, 0);
+		if (!OPTS_ZEROED(opts, tracing_multi))
+			return libbpf_err(-EINVAL);
+		break;
 	case BPF_TRACE_RAW_TP:
 	case BPF_TRACE_FENTRY:
 	case BPF_TRACE_FEXIT:
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 2312900a3263..012354131cf6 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -469,6 +469,11 @@ struct bpf_link_create_opts {
 			__u32 relative_id;
 			__u64 expected_revision;
 		} cgroup;
+		struct {
+			const __u32 *ids;
+			const __u64 *cookies;
+			__u32 cnt;
+		} tracing_multi;
 	};
 	size_t :0;
 };
-- 
2.54.0
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