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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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20
src/libbpf.c
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@@ -12309,13 +12309,19 @@ static int attach_tp(const struct bpf_program *prog, long cookie, struct bpf_lin
return libbpf_get_error(*link);
}
struct bpf_link *bpf_program__attach_raw_tracepoint(const struct bpf_program *prog,
const char *tp_name)
struct bpf_link *
bpf_program__attach_raw_tracepoint_opts(const struct bpf_program *prog,
const char *tp_name,
struct bpf_raw_tracepoint_opts *opts)
{
LIBBPF_OPTS(bpf_raw_tp_opts, raw_opts);
char errmsg[STRERR_BUFSIZE];
struct bpf_link *link;
int prog_fd, pfd;
if (!OPTS_VALID(opts, bpf_raw_tracepoint_opts))
return libbpf_err_ptr(-EINVAL);
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("prog '%s': can't attach before loaded\n", prog->name);
@@ -12327,7 +12333,9 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(const struct bpf_program *pr
return libbpf_err_ptr(-ENOMEM);
link->detach = &bpf_link__detach_fd;
pfd = bpf_raw_tracepoint_open(tp_name, prog_fd);
raw_opts.tp_name = tp_name;
raw_opts.cookie = OPTS_GET(opts, cookie, 0);
pfd = bpf_raw_tracepoint_open_opts(prog_fd, &raw_opts);
if (pfd < 0) {
pfd = -errno;
free(link);
@@ -12339,6 +12347,12 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(const struct bpf_program *pr
return link;
}
struct bpf_link *bpf_program__attach_raw_tracepoint(const struct bpf_program *prog,
const char *tp_name)
{
return bpf_program__attach_raw_tracepoint_opts(prog, tp_name, NULL);
}
static int attach_raw_tp(const struct bpf_program *prog, long cookie, struct bpf_link **link)
{
static const char *const prefixes[] = {