diff options
author | Alexei Starovoitov <ast@kernel.org> | 2020-01-10 09:41:24 +0300 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-01-10 19:20:07 +0300 |
commit | 360301a6c21be87fe881546bd5f22eccf7a165c5 (patch) | |
tree | 29f80d80eff2526f251e5def34a8b7eb870b0504 /tools/testing/selftests/bpf/progs/test_global_func1.c | |
parent | e528d1c0127accbc2be48f57dd67ab89b32fd815 (diff) | |
download | linux-360301a6c21be87fe881546bd5f22eccf7a165c5.tar.xz |
selftests/bpf: Add unit tests for global functions
test_global_func[12] - check 512 stack limit.
test_global_func[34] - check 8 frame call chain limit.
test_global_func5 - check that non-ctx pointer cannot be passed into
a function that expects context.
test_global_func6 - check that ctx pointer is unmodified.
test_global_func7 - check that global function returns scalar.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200110064124.1760511-7-ast@kernel.org
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_global_func1.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_global_func1.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_global_func1.c b/tools/testing/selftests/bpf/progs/test_global_func1.c new file mode 100644 index 000000000000..97d57d6e244e --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_global_func1.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2020 Facebook */ +#include <stddef.h> +#include <linux/bpf.h> +#include "bpf_helpers.h" + +#ifndef MAX_STACK +#define MAX_STACK (512 - 3 * 32 + 8) +#endif + +static __attribute__ ((noinline)) +int f0(int var, struct __sk_buff *skb) +{ + return skb->len; +} + +__attribute__ ((noinline)) +int f1(struct __sk_buff *skb) +{ + volatile char buf[MAX_STACK] = {}; + + return f0(0, skb) + skb->len; +} + +int f3(int, struct __sk_buff *skb, int); + +__attribute__ ((noinline)) +int f2(int val, struct __sk_buff *skb) +{ + return f1(skb) + f3(val, skb, 1); +} + +__attribute__ ((noinline)) +int f3(int val, struct __sk_buff *skb, int var) +{ + volatile char buf[MAX_STACK] = {}; + + return skb->ifindex * val * var; +} + +SEC("classifier/test") +int test_cls(struct __sk_buff *skb) +{ + return f0(1, skb) + f1(skb) + f2(2, skb) + f3(3, skb, 4); +} |