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libbpf: Support detecting and attaching of writable tracepoint program 

Program on writable tracepoint is BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE,
but its attachment is the same as BPF_PROG_TYPE_RAW_TRACEPOINT.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211004094857.30868-3-hotforest@gmail.com
This commit is contained in:
Hou Tao 2021-10-04 17:48:56 +08:00 committed by Andrii Nakryiko
parent 65223741ae
commit ccaf12d621
1 changed files with 21 additions and 5 deletions
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26
tools/lib/bpf/libbpf.c
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@ -8077,6 +8077,8 @@ static const struct bpf_sec_def section_defs[] = {
SEC_DEF("tp/", TRACEPOINT, 0, SEC_NONE, attach_tp),
SEC_DEF("raw_tracepoint/", RAW_TRACEPOINT, 0, SEC_NONE, attach_raw_tp),
SEC_DEF("raw_tp/", RAW_TRACEPOINT, 0, SEC_NONE, attach_raw_tp),
SEC_DEF("raw_tracepoint.w/", RAW_TRACEPOINT_WRITABLE, 0, SEC_NONE, attach_raw_tp),
SEC_DEF("raw_tp.w/", RAW_TRACEPOINT_WRITABLE, 0, SEC_NONE, attach_raw_tp),
SEC_DEF("tp_btf/", TRACING, BPF_TRACE_RAW_TP, SEC_ATTACH_BTF, attach_trace),
SEC_DEF("fentry/", TRACING, BPF_TRACE_FENTRY, SEC_ATTACH_BTF, attach_trace),
SEC_DEF("fmod_ret/", TRACING, BPF_MODIFY_RETURN, SEC_ATTACH_BTF, attach_trace),
@ -9846,12 +9848,26 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(const struct bpf_program *pr
static struct bpf_link *attach_raw_tp(const struct bpf_program *prog, long cookie)
{
const char *tp_name;
static const char *const prefixes[] = {
"raw_tp/",
"raw_tracepoint/",
"raw_tp.w/",
"raw_tracepoint.w/",
};
size_t i;
const char *tp_name = NULL;
if (str_has_pfx(prog->sec_name, "raw_tp/"))
tp_name = prog->sec_name + sizeof("raw_tp/") - 1;
else
tp_name = prog->sec_name + sizeof("raw_tracepoint/") - 1;
for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
if (str_has_pfx(prog->sec_name, prefixes[i])) {
tp_name = prog->sec_name + strlen(prefixes[i]);
break;
}
}
if (!tp_name) {
pr_warn("prog '%s': invalid section name '%s'\n",
prog->name, prog->sec_name);
return libbpf_err_ptr(-EINVAL);
}
return bpf_program__attach_raw_tracepoint(prog, tp_name);
}