diff options
Diffstat (limited to '')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/legacy_printk.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/legacy_printk.c b/tools/testing/selftests/bpf/prog_tests/legacy_printk.c new file mode 100644 index 000000000..ec6e45f2a --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/legacy_printk.c @@ -0,0 +1,65 @@ +// 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); +} |