[PATCH 5/8] libbpf: Add bpf_link_create support for multi kprobes

Jiri Olsa
2022-02-02T13:54:18Z

Adding new kprobe struct in bpf_link_create_opts object
to pass multi kprobe data to link_create attr API.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/lib/bpf/bpf.c | 7 +++++++
tools/lib/bpf/bpf.h | 9 ++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 418b259166f8..98156709a96c 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -853,6 +853,13 @@ int bpf_link_create(int prog_fd, int target_fd,
if (!OPTS_ZEROED(opts, perf_event))
return libbpf_err(-EINVAL);
break;
+ case BPF_TRACE_FPROBE:
+ attr.link_create.fprobe.syms = OPTS_GET(opts, fprobe.syms, 0);
+ attr.link_create.fprobe.addrs = OPTS_GET(opts, fprobe.addrs, 0);
+ attr.link_create.fprobe.cnt = OPTS_GET(opts, fprobe.cnt, 0);
+ attr.link_create.fprobe.flags = OPTS_GET(opts, fprobe.flags, 0);
+ attr.link_create.fprobe.bpf_cookies = OPTS_GET(opts, fprobe.bpf_cookies, 0);
+ break;
default:
if (!OPTS_ZEROED(opts, flags))
return libbpf_err(-EINVAL);
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index c2e8327010f9..114e828ae027 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -413,10 +413,17 @@ struct bpf_link_create_opts {
struct {
__u64 bpf_cookie;
} perf_event;
+ struct {
+ __u64 syms;
+ __u64 addrs;
+ __u32 cnt;
+ __u32 flags;
+ __u64 bpf_cookies;
+ } fprobe;
};
size_t :0;
};
-#define bpf_link_create_opts__last_field perf_event
+#define bpf_link_create_opts__last_field fprobe.bpf_cookies

LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
enum bpf_attach_type attach_type,
--
2.34.1