libbpf: Add bpf_link_create support for multi uprobes

Adding new uprobe_multi struct to bpf_link_create_opts object
to pass multiple uprobe data to link_create attr uapi.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230809083440.3209381-14-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index c9b6b311a441f754ef54d55ff4b475198c11f530..b0f1913763a33250987aaf4112682df4fdc6895e 100644 (file)
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -767,6 +767,17 @@ int bpf_link_create(int prog_fd, int target_fd,
                if (!OPTS_ZEROED(opts, kprobe_multi))
                        return libbpf_err(-EINVAL);
                break;
+       case BPF_TRACE_UPROBE_MULTI:
+               attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0);
+               attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0);
+               attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0));
+               attr.link_create.uprobe_multi.offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.offsets, 0));
+               attr.link_create.uprobe_multi.ref_ctr_offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.ref_ctr_offsets, 0));
+               attr.link_create.uprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, uprobe_multi.cookies, 0));
+               attr.link_create.uprobe_multi.pid = OPTS_GET(opts, uprobe_multi.pid, 0);
+               if (!OPTS_ZEROED(opts, uprobe_multi))
+                       return libbpf_err(-EINVAL);
+               break;
        case BPF_TRACE_FENTRY:
        case BPF_TRACE_FEXIT:
        case BPF_MODIFY_RETURN:

diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 044a74ffc38aa168dda41f2b527f64ca44348558..74c2887cfd24a56d3dd0892dd8dde7a3e37d2b59 100644 (file)
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -392,6 +392,15 @@ struct bpf_link_create_opts {
                        const unsigned long *addrs;
                        const __u64 *cookies;
                } kprobe_multi;
+               struct {
+                       __u32 flags;
+                       __u32 cnt;
+                       const char *path;
+                       const unsigned long *offsets;
+                       const unsigned long *ref_ctr_offsets;
+                       const __u64 *cookies;
+                       __u32 pid;
+               } uprobe_multi;
                struct {
                        __u64 cookie;
                } tracing;
@@ -409,7 +418,7 @@ struct bpf_link_create_opts {
        };
        size_t :0;
 };
-#define bpf_link_create_opts__last_field kprobe_multi.cookies
+#define bpf_link_create_opts__last_field uprobe_multi.pid
 
 LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
                               enum bpf_attach_type attach_type,