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selftests/bpf: Tests libbpf autoattach APIs

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Adds test for libbpf APIs that toggle bpf program auto-attaching.

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220816234012.910255-2-haoluo@google.com
This commit is contained in:
Hao Luo 2022-08-16 16:40:12 -07:00 committed by Andrii Nakryiko
parent 43cb8cbadf
commit 738a2f2f91
2 changed files with 53 additions and 0 deletions
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30
tools/testing/selftests/bpf/prog_tests/autoattach.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Google */
#include <test_progs.h>
#include "test_autoattach.skel.h"
void test_autoattach(void)
{
struct test_autoattach *skel;
skel = test_autoattach__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
goto cleanup;
/* disable auto-attach for prog2 */
bpf_program__set_autoattach(skel->progs.prog2, false);
ASSERT_TRUE(bpf_program__autoattach(skel->progs.prog1), "autoattach_prog1");
ASSERT_FALSE(bpf_program__autoattach(skel->progs.prog2), "autoattach_prog2");
if (!ASSERT_OK(test_autoattach__attach(skel), "skel_attach"))
goto cleanup;
usleep(1);
ASSERT_TRUE(skel->bss->prog1_called, "attached_prog1");
ASSERT_FALSE(skel->bss->prog2_called, "attached_prog2");
cleanup:
test_autoattach__destroy(skel);
}

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tools/testing/selftests/bpf/progs/test_autoattach.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Google */
#include "vmlinux.h"
#include <bpf/bpf_tracing.h>
bool prog1_called = false;
bool prog2_called = false;
SEC("raw_tp/sys_enter")
int prog1(const void *ctx)
{
prog1_called = true;
return 0;
}
SEC("raw_tp/sys_exit")
int prog2(const void *ctx)
{
prog2_called = true;
return 0;
}