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libbpf: Add bpf_link_create support for multi uprobes

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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>
This commit is contained in:
Jiri Olsa 2023-08-09 10:34:25 +02:00 committed by Alexei Starovoitov
parent e613d1d0f7
commit 5054a303f8
2 changed files with 21 additions and 1 deletions
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11
tools/lib/bpf/bpf.c
View file

@ -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:

11
tools/lib/bpf/bpf.h
View file

@ -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,