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selftests/bpf: Add test validating data section to struct convertion layout 

Add a simple selftests validating datasection-to-struct layour dumping. Global
variables are constructed in such a way as to cause both natural and
artificial padding (through custom alignment requirement).

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191214014341.3442258-17-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2019-12-13 17:43:40 -08:00 committed by Alexei Starovoitov
parent dde53c1b76
commit 197448eaac
2 changed files with 88 additions and 0 deletions
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51
tools/testing/selftests/bpf/prog_tests/skeleton.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
struct s {
int a;
long long b;
} __attribute__((packed));
#include "test_skeleton.skel.h"
BPF_EMBED_OBJ(skeleton, "test_skeleton.o");
void test_skeleton(void)
{
int duration = 0, err;
struct test_skeleton* skel;
struct test_skeleton__bss *bss;
skel = test_skeleton__open_and_load(&skeleton_embed);
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
bss = skel->bss;
bss->in1 = 1;
bss->in2 = 2;
bss->in3 = 3;
bss->in4 = 4;
bss->in5.a = 5;
bss->in5.b = 6;
err = test_skeleton__attach(skel);
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
goto cleanup;
/* trigger tracepoint */
usleep(1);
CHECK(bss->out1 != 1, "res1", "got %d != exp %d\n", bss->out1, 1);
CHECK(bss->out2 != 2, "res2", "got %lld != exp %d\n", bss->out2, 2);
CHECK(bss->out3 != 3, "res3", "got %d != exp %d\n", (int)bss->out3, 3);
CHECK(bss->out4 != 4, "res4", "got %lld != exp %d\n", bss->out4, 4);
CHECK(bss->handler_out5.a != 5, "res5", "got %d != exp %d\n",
bss->handler_out5.a, 5);
CHECK(bss->handler_out5.b != 6, "res6", "got %lld != exp %d\n",
bss->handler_out5.b, 6);
cleanup:
test_skeleton__destroy(skel);
}

37
tools/testing/selftests/bpf/progs/test_skeleton.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <linux/bpf.h>
#include "bpf_helpers.h"
struct s {
int a;
long long b;
} __attribute__((packed));
int in1 = 0;
long long in2 = 0;
char in3 = '\0';
long long in4 __attribute__((aligned(64))) = 0;
struct s in5 = {};
long long out2 = 0;
char out3 = 0;
long long out4 = 0;
int out1 = 0;
SEC("raw_tp/sys_enter")
int handler(const void *ctx)
{
static volatile struct s out5;
out1 = in1;
out2 = in2;
out3 = in3;
out4 = in4;
out5 = in5;
return 0;
}
char _license[] SEC("license") = "GPL";