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libbpf: Add bpf_link_create support for multi kprobes 

Adding new kprobe_multi struct to bpf_link_create_opts object
to pass multiple kprobe data to link_create attr uapi.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-9-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2022-03-16 13:24:14 +01:00 committed by Alexei Starovoitov
parent 85153ac062
commit 5117c26e87
2 changed files with 17 additions and 1 deletions
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9
tools/lib/bpf/bpf.c
View File

@ -854,6 +854,15 @@ int bpf_link_create(int prog_fd, int target_fd,
if (!OPTS_ZEROED(opts, perf_event))
return libbpf_err(-EINVAL);
break;
case BPF_TRACE_KPROBE_MULTI:
attr.link_create.kprobe_multi.flags = OPTS_GET(opts, kprobe_multi.flags, 0);
attr.link_create.kprobe_multi.cnt = OPTS_GET(opts, kprobe_multi.cnt, 0);
attr.link_create.kprobe_multi.syms = ptr_to_u64(OPTS_GET(opts, kprobe_multi.syms, 0));
attr.link_create.kprobe_multi.addrs = ptr_to_u64(OPTS_GET(opts, kprobe_multi.addrs, 0));
attr.link_create.kprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, kprobe_multi.cookies, 0));
if (!OPTS_ZEROED(opts, kprobe_multi))
return libbpf_err(-EINVAL);
break;
default:
if (!OPTS_ZEROED(opts, flags))
return libbpf_err(-EINVAL);

9
tools/lib/bpf/bpf.h
View File

@ -413,10 +413,17 @@ struct bpf_link_create_opts {
struct {
__u64 bpf_cookie;
} perf_event;
struct {
__u32 flags;
__u32 cnt;
const char **syms;
const unsigned long *addrs;
const __u64 *cookies;
} kprobe_multi;
};
size_t :0;
};
#define bpf_link_create_opts__last_field perf_event
#define bpf_link_create_opts__last_field kprobe_multi.cookies
LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
enum bpf_attach_type attach_type,