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-rw-r--r--tools/lib/bpf/libbpf.c46
1 files changed, 44 insertions, 2 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 169e347c76f6..2ccde17957e6 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2667,9 +2667,38 @@ static const struct {
#undef BPF_EAPROG_SEC
#undef BPF_APROG_COMPAT
+#define MAX_TYPE_NAME_SIZE 32
+
+static char *libbpf_get_type_names(bool attach_type)
+{
+ int i, len = ARRAY_SIZE(section_names) * MAX_TYPE_NAME_SIZE;
+ char *buf;
+
+ buf = malloc(len);
+ if (!buf)
+ return NULL;
+
+ buf[0] = '\0';
+ /* Forge string buf with all available names */
+ for (i = 0; i < ARRAY_SIZE(section_names); i++) {
+ if (attach_type && !section_names[i].is_attachable)
+ continue;
+
+ if (strlen(buf) + strlen(section_names[i].sec) + 2 > len) {
+ free(buf);
+ return NULL;
+ }
+ strcat(buf, " ");
+ strcat(buf, section_names[i].sec);
+ }
+
+ return buf;
+}
+
int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
enum bpf_attach_type *expected_attach_type)
{
+ char *type_names;
int i;
if (!name)
@@ -2682,12 +2711,20 @@ int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
*expected_attach_type = section_names[i].expected_attach_type;
return 0;
}
+ pr_warning("failed to guess program type based on ELF section name '%s'\n", name);
+ type_names = libbpf_get_type_names(false);
+ if (type_names != NULL) {
+ pr_info("supported section(type) names are:%s\n", type_names);
+ free(type_names);
+ }
+
return -EINVAL;
}
int libbpf_attach_type_by_name(const char *name,
enum bpf_attach_type *attach_type)
{
+ char *type_names;
int i;
if (!name)
@@ -2701,6 +2738,13 @@ int libbpf_attach_type_by_name(const char *name,
*attach_type = section_names[i].attach_type;
return 0;
}
+ pr_warning("failed to guess attach type based on ELF section name '%s'\n", name);
+ type_names = libbpf_get_type_names(true);
+ if (type_names != NULL) {
+ pr_info("attachable section(type) names are:%s\n", type_names);
+ free(type_names);
+ }
+
return -EINVAL;
}
@@ -2907,8 +2951,6 @@ int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
err = bpf_program__identify_section(prog, &prog_type,
&expected_attach_type);
if (err < 0) {
- pr_warning("failed to guess program type based on section name %s\n",
- prog->section_name);
bpf_object__close(obj);
return -EINVAL;
}