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libbpf: add support for BPF cookie for raw_tp/tp_btf programs

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Wire up BPF cookie passing or raw_tp and tp_btf programs, both in
low-level and high-level APIs.

Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Message-ID: <20240319233852.1977493-5-andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2024-03-19 16:38:51 -07:00
committed by Andrii Nakryiko
parent cbd6e3596c
commit f5828cc352
5 changed files with 53 additions and 5 deletions
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16
src/bpf.c
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@@ -785,6 +785,7 @@ int bpf_link_create(int prog_fd, int target_fd,
if (!OPTS_ZEROED(opts, uprobe_multi))
return libbpf_err(-EINVAL);
break;
case BPF_TRACE_RAW_TP:
case BPF_TRACE_FENTRY:
case BPF_TRACE_FEXIT:
case BPF_MODIFY_RETURN:
@@ -1173,20 +1174,31 @@ int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info
return bpf_obj_get_info_by_fd(link_fd, info, info_len);
}
int bpf_raw_tracepoint_open(const char *name, int prog_fd)
int bpf_raw_tracepoint_open_opts(int prog_fd, struct bpf_raw_tp_opts *opts)
{
const size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint);
union bpf_attr attr;
int fd;
if (!OPTS_VALID(opts, bpf_raw_tp_opts))
return libbpf_err(-EINVAL);
memset(&attr, 0, attr_sz);
attr.raw_tracepoint.name = ptr_to_u64(name);
attr.raw_tracepoint.prog_fd = prog_fd;
attr.raw_tracepoint.name = ptr_to_u64(OPTS_GET(opts, tp_name, NULL));
attr.raw_tracepoint.cookie = OPTS_GET(opts, cookie, 0);
fd = sys_bpf_fd(BPF_RAW_TRACEPOINT_OPEN, &attr, attr_sz);
return libbpf_err_errno(fd);
}
int bpf_raw_tracepoint_open(const char *name, int prog_fd)
{
LIBBPF_OPTS(bpf_raw_tp_opts, opts, .tp_name = name);
return bpf_raw_tracepoint_open_opts(prog_fd, &opts);
}
int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts *opts)
{
const size_t attr_sz = offsetofend(union bpf_attr, btf_token_fd);