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selftests/bpf: Test autocreate behavior for struct_ops maps

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Check that bpf_map__set_autocreate() can be used to disable automatic
creation for struct_ops maps.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240306104529.6453-8-eddyz87@gmail.com
This commit is contained in:
Eduard Zingerman 2024-03-06 12:45:21 +02:00 committed by Andrii Nakryiko
parent c1b93c07b3
commit 1863acccdf
2 changed files with 118 additions and 0 deletions
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76
tools/testing/selftests/bpf/prog_tests/struct_ops_autocreate.c Normal file
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@ -0,0 +1,76 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "struct_ops_autocreate.skel.h"
static void cant_load_full_object(void)
{
struct struct_ops_autocreate *skel;
char *log = NULL;
int err;
skel = struct_ops_autocreate__open();
if (!ASSERT_OK_PTR(skel, "struct_ops_autocreate__open"))
return;
if (start_libbpf_log_capture())
goto cleanup;
/* The testmod_2 map BTF type (struct bpf_testmod_ops___v2) doesn't
* match the BTF of the actual struct bpf_testmod_ops defined in the
* kernel, so we should fail to load it if we don't disable autocreate
* for that map.
*/
err = struct_ops_autocreate__load(skel);
log = stop_libbpf_log_capture();
if (!ASSERT_ERR(err, "struct_ops_autocreate__load"))
goto cleanup;
ASSERT_HAS_SUBSTR(log, "libbpf: struct_ops init_kern", "init_kern message");
ASSERT_EQ(err, -ENOTSUP, "errno should be ENOTSUP");
cleanup:
free(log);
struct_ops_autocreate__destroy(skel);
}
static void can_load_partial_object(void)
{
struct struct_ops_autocreate *skel;
struct bpf_link *link = NULL;
int err;
skel = struct_ops_autocreate__open();
if (!ASSERT_OK_PTR(skel, "struct_ops_autocreate__open_opts"))
return;
err = bpf_program__set_autoload(skel->progs.test_2, false);
if (!ASSERT_OK(err, "bpf_program__set_autoload"))
goto cleanup;
err = bpf_map__set_autocreate(skel->maps.testmod_2, false);
if (!ASSERT_OK(err, "bpf_map__set_autocreate"))
goto cleanup;
err = struct_ops_autocreate__load(skel);
if (ASSERT_OK(err, "struct_ops_autocreate__load"))
goto cleanup;
link = bpf_map__attach_struct_ops(skel->maps.testmod_1);
if (!ASSERT_OK_PTR(link, "bpf_map__attach_struct_ops"))
goto cleanup;
/* test_1() would be called from bpf_dummy_reg2() in bpf_testmod.c */
ASSERT_EQ(skel->bss->test_1_result, 42, "test_1_result");
cleanup:
bpf_link__destroy(link);
struct_ops_autocreate__destroy(skel);
}
void test_struct_ops_autocreate(void)
{
if (test__start_subtest("cant_load_full_object"))
cant_load_full_object();
if (test__start_subtest("can_load_partial_object"))
can_load_partial_object();
}

42
tools/testing/selftests/bpf/progs/struct_ops_autocreate.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
int test_1_result = 0;
SEC("struct_ops/test_1")
int BPF_PROG(test_1)
{
test_1_result = 42;
return 0;
}
SEC("struct_ops/test_1")
int BPF_PROG(test_2)
{
return 0;
}
struct bpf_testmod_ops___v1 {
int (*test_1)(void);
};
struct bpf_testmod_ops___v2 {
int (*test_1)(void);
int (*does_not_exist)(void);
};
SEC(".struct_ops.link")
struct bpf_testmod_ops___v1 testmod_1 = {
.test_1 = (void *)test_1
};
SEC(".struct_ops.link")
struct bpf_testmod_ops___v2 testmod_2 = {
.test_1 = (void *)test_1,
.does_not_exist = (void *)test_2
};