From 8c18311067d0f0d5f332b9e1f3859eb15e23332d Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Tue, 30 Jun 2020 08:21:25 -0700 Subject: selftests/bpf: Add byte swapping selftest Add simple selftest validating byte swap built-ins and compile-time macros. Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20200630152125.3631920-3-andriin@fb.com --- tools/testing/selftests/bpf/prog_tests/endian.c | 53 +++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/test_endian.c | 37 +++++++++++++++++ 2 files changed, 90 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/endian.c create mode 100644 tools/testing/selftests/bpf/progs/test_endian.c diff --git a/tools/testing/selftests/bpf/prog_tests/endian.c b/tools/testing/selftests/bpf/prog_tests/endian.c new file mode 100644 index 000000000000..1a11612ace6c --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/endian.c @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include +#include "test_endian.skel.h" + +static int duration; + +#define IN16 0x1234 +#define IN32 0x12345678U +#define IN64 0x123456789abcdef0ULL + +#define OUT16 0x3412 +#define OUT32 0x78563412U +#define OUT64 0xf0debc9a78563412ULL + +void test_endian(void) +{ + struct test_endian* skel; + struct test_endian__bss *bss; + int err; + + skel = test_endian__open_and_load(); + if (CHECK(!skel, "skel_open", "failed to open skeleton\n")) + return; + bss = skel->bss; + + bss->in16 = IN16; + bss->in32 = IN32; + bss->in64 = IN64; + + err = test_endian__attach(skel); + if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err)) + goto cleanup; + + usleep(1); + + CHECK(bss->out16 != OUT16, "out16", "got 0x%llx != exp 0x%llx\n", + (__u64)bss->out16, (__u64)OUT16); + CHECK(bss->out32 != OUT32, "out32", "got 0x%llx != exp 0x%llx\n", + (__u64)bss->out32, (__u64)OUT32); + CHECK(bss->out64 != OUT64, "out16", "got 0x%llx != exp 0x%llx\n", + (__u64)bss->out64, (__u64)OUT64); + + CHECK(bss->const16 != OUT16, "const16", "got 0x%llx != exp 0x%llx\n", + (__u64)bss->const16, (__u64)OUT16); + CHECK(bss->const32 != OUT32, "const32", "got 0x%llx != exp 0x%llx\n", + (__u64)bss->const32, (__u64)OUT32); + CHECK(bss->const64 != OUT64, "const64", "got 0x%llx != exp 0x%llx\n", + (__u64)bss->const64, (__u64)OUT64); +cleanup: + test_endian__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_endian.c b/tools/testing/selftests/bpf/progs/test_endian.c new file mode 100644 index 000000000000..ddb687c5d125 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_endian.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include "vmlinux.h" +#include +#include + +#define IN16 0x1234 +#define IN32 0x12345678U +#define IN64 0x123456789abcdef0ULL + +__u16 in16 = 0; +__u32 in32 = 0; +__u64 in64 = 0; + +__u16 out16 = 0; +__u32 out32 = 0; +__u64 out64 = 0; + +__u16 const16 = 0; +__u32 const32 = 0; +__u64 const64 = 0; + +SEC("raw_tp/sys_enter") +int sys_enter(const void *ctx) +{ + out16 = __builtin_bswap16(in16); + out32 = __builtin_bswap32(in32); + out64 = __builtin_bswap64(in64); + const16 = ___bpf_swab16(IN16); + const32 = ___bpf_swab32(IN32); + const64 = ___bpf_swab64(IN64); + + return 0; +} + +char _license[] SEC("license") = "GPL"; -- cgit v1.2.3-59-g8ed1b