new file mode 100644
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
+
+#include <ctype.h>
+#include <test_progs.h>
+#include <bpf/btf.h>
+
+/**
+ * Utility function uppercasing an entire string.
+ */
+static void uppercase(char *s)
+{
+ for (; *s != '\0'; s++)
+ *s = toupper(*s);
+}
+
+/**
+ * Test case to check that all bpf_prog_type variants are covered by
+ * libbpf_bpf_prog_type_str.
+ */
+void test_libbpf_bpf_prog_type_str(void)
+{
+ struct btf *btf;
+ const struct btf_type *t;
+ const struct btf_enum *e;
+ int i, n, id;
+
+ btf = btf__parse("/sys/kernel/btf/vmlinux", NULL);
+ if (!ASSERT_OK_PTR(btf, "btf_parse"))
+ return;
+
+ /* find enum bpf_prog_type and enumerate each value */
+ id = btf__find_by_name_kind(btf, "bpf_prog_type", BTF_KIND_ENUM);
+ if (!ASSERT_GT(id, 0, "bpf_prog_type_id"))
+ goto cleanup;
+ t = btf__type_by_id(btf, id);
+ e = btf_enum(t);
+ n = btf_vlen(t);
+ for (i = 0; i < n; e++, i++) {
+ enum bpf_prog_type prog_type = (enum bpf_prog_type)e->val;
+ const char *prog_type_name;
+ const char *prog_type_str;
+ char buf[256];
+
+ prog_type_name = btf__str_by_offset(btf, e->name_off);
+ prog_type_str = libbpf_bpf_prog_type_str(prog_type);
+ ASSERT_OK_PTR(prog_type_str, prog_type_name);
+
+ snprintf(buf, sizeof(buf), "BPF_PROG_TYPE_%s", prog_type_str);
+ uppercase(buf);
+
+ ASSERT_STREQ(buf, prog_type_name, "exp_str_value");
+ }
+
+cleanup:
+ btf__free(btf);
+}
This change adds a test for libbpf_bpf_prog_type_str. The test retrieves all variants of the bpf_prog_type enumeration using BTF and makes sure that the function under test works as expected for them. Signed-off-by: Daniel Müller <deso@posteo.net> --- .../selftests/bpf/prog_tests/libbpf_str.c | 57 +++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/libbpf_str.c