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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include "test_legacy_printk.skel.h"
static int execute_one_variant(bool legacy)
{
struct test_legacy_printk *skel;
int err, zero = 0, my_pid = getpid(), res, map_fd;
skel = test_legacy_printk__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return -errno;
bpf_program__set_autoload(skel->progs.handle_legacy, legacy);
bpf_program__set_autoload(skel->progs.handle_modern, !legacy);
err = test_legacy_printk__load(skel);
/* no ASSERT_OK, we expect one of two variants can fail here */
if (err)
goto err_out;
if (legacy) {
map_fd = bpf_map__fd(skel->maps.my_pid_map);
err = bpf_map_update_elem(map_fd, &zero, &my_pid, BPF_ANY);
if (!ASSERT_OK(err, "my_pid_map_update"))
goto err_out;
err = bpf_map_lookup_elem(map_fd, &zero, &res);
} else {
skel->bss->my_pid_var = my_pid;
}
err = test_legacy_printk__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto err_out;
usleep(1); /* trigger */
if (legacy) {
map_fd = bpf_map__fd(skel->maps.res_map);
err = bpf_map_lookup_elem(map_fd, &zero, &res);
if (!ASSERT_OK(err, "res_map_lookup"))
goto err_out;
} else {
res = skel->bss->res_var;
}
if (!ASSERT_GT(res, 0, "res")) {
err = -EINVAL;
goto err_out;
}
err_out:
test_legacy_printk__destroy(skel);
return err;
}
void test_legacy_printk(void)
{
/* legacy variant should work everywhere */
ASSERT_OK(execute_one_variant(true /* legacy */), "legacy_case");
/* execute modern variant, can fail the load on old kernels */
execute_one_variant(false);
}
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