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selftests/bpf: Test btf__load_vmlinux_btf/btf__load_module_btf APIs

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Add test for btf__load_vmlinux_btf/btf__load_module_btf APIs. The test
loads bpf_testmod module BTF and check existence of a symbol which is
known to exist.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210815081035.205879-1-hengqi.chen@gmail.com
This commit is contained in:
Hengqi Chen 2021-08-15 16:10:35 +08:00 committed by Andrii Nakryiko
parent bb57164920
commit edce1a2486
1 changed files with 34 additions and 0 deletions
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34
tools/testing/selftests/bpf/prog_tests/btf_module.c Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2021 Hengqi Chen */
#include <test_progs.h>
#include <bpf/btf.h>
static const char *module_name = "bpf_testmod";
static const char *symbol_name = "bpf_testmod_test_read";
void test_btf_module()
{
struct btf *vmlinux_btf, *module_btf;
__s32 type_id;
if (!env.has_testmod) {
test__skip();
return;
}
vmlinux_btf = btf__load_vmlinux_btf();
if (!ASSERT_OK_PTR(vmlinux_btf, "could not load vmlinux BTF"))
return;
module_btf = btf__load_module_btf(module_name, vmlinux_btf);
if (!ASSERT_OK_PTR(module_btf, "could not load module BTF"))
goto cleanup;
type_id = btf__find_by_name(module_btf, symbol_name);
ASSERT_GT(type_id, 0, "func not found");
cleanup:
btf__free(module_btf);
btf__free(vmlinux_btf);
}