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selftests/bpf: Add byte swapping selftest 

Add simple selftest validating byte swap built-ins and compile-time macros.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200630152125.3631920-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-06-30 08:21:25 -07:00 committed by Daniel Borkmann
parent 30ad688094
commit 8c18311067
2 changed files with 90 additions and 0 deletions
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53
tools/testing/selftests/bpf/prog_tests/endian.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#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);
}

37
tools/testing/selftests/bpf/progs/test_endian.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#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";