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selftests/bpf: validate generic bpf_object and subskel APIs work together

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Add a new subtest validating that bpf_object loaded and initialized
through generic APIs is still interoperable with BPF subskeleton,
including initialization and reading of global variables.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20241023043908.3834423-4-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2024-10-22 21:39:08 -07:00
committed by Alexei Starovoitov
parent 137978f422
commit 80a54566b7
1 changed files with 75 additions and 1 deletions
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76
tools/testing/selftests/bpf/prog_tests/subskeleton.c
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@@ -46,7 +46,8 @@ static int subskeleton_lib_subresult(struct bpf_object *obj)
return result;
}
void test_subskeleton(void)
/* initialize and load through skeleton, then instantiate subskeleton out of it */
static void subtest_skel_subskeleton(void)
{
int err, result;
struct test_subskeleton *skel;
@@ -76,3 +77,76 @@ void test_subskeleton(void)
cleanup:
test_subskeleton__destroy(skel);
}
/* initialize and load through generic bpf_object API, then instantiate subskeleton out of it */
static void subtest_obj_subskeleton(void)
{
int err, result;
const void *elf_bytes;
size_t elf_bytes_sz = 0, rodata_sz = 0, bss_sz = 0;
struct bpf_object *obj;
const struct bpf_map *map;
const struct bpf_program *prog;
struct bpf_link *link = NULL;
struct test_subskeleton__rodata *rodata;
struct test_subskeleton__bss *bss;
elf_bytes = test_subskeleton__elf_bytes(&elf_bytes_sz);
if (!ASSERT_OK_PTR(elf_bytes, "elf_bytes"))
return;
obj = bpf_object__open_mem(elf_bytes, elf_bytes_sz, NULL);
if (!ASSERT_OK_PTR(obj, "obj_open_mem"))
return;
map = bpf_object__find_map_by_name(obj, ".rodata");
if (!ASSERT_OK_PTR(map, "rodata_map_by_name"))
goto cleanup;
rodata = bpf_map__initial_value(map, &rodata_sz);
if (!ASSERT_OK_PTR(rodata, "rodata_get"))
goto cleanup;
rodata->rovar1 = 10;
rodata->var1 = 1;
subskeleton_lib_setup(obj);
err = bpf_object__load(obj);
if (!ASSERT_OK(err, "obj_load"))
goto cleanup;
prog = bpf_object__find_program_by_name(obj, "handler1");
if (!ASSERT_OK_PTR(prog, "prog_by_name"))
goto cleanup;
link = bpf_program__attach(prog);
if (!ASSERT_OK_PTR(link, "prog_attach"))
goto cleanup;
/* trigger tracepoint */
usleep(1);
map = bpf_object__find_map_by_name(obj, ".bss");
if (!ASSERT_OK_PTR(map, "bss_map_by_name"))
goto cleanup;
bss = bpf_map__initial_value(map, &bss_sz);
if (!ASSERT_OK_PTR(rodata, "rodata_get"))
goto cleanup;
result = subskeleton_lib_subresult(obj) * 10;
ASSERT_EQ(bss->out1, result, "out1");
cleanup:
bpf_link__destroy(link);
bpf_object__close(obj);
}
void test_subskeleton(void)
{
if (test__start_subtest("skel_subskel"))
subtest_skel_subskeleton();
if (test__start_subtest("obj_subskel"))
subtest_obj_subskeleton();
}