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selftests/bpf: Add vmlinux.h selftest exercising tracing of syscalls

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Add vmlinux.h generation to selftest/bpf's Makefile. Use it from newly added
test_vmlinux to trace nanosleep syscall using 5 different types of programs:
  - tracepoint;
  - raw tracepoint;
  - raw tracepoint w/ direct memory reads (tp_btf);
  - kprobe;
  - fentry.

These programs are realistic variants of real-life tracing programs,
excercising vmlinux.h's usage with tracing applications.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200313172336.1879637-5-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2020-03-13 10:23:36 -07:00
committed by Daniel Borkmann
parent b8ebce86ff
commit acbd06206b
3 changed files with 133 additions and 1 deletions
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43
tools/testing/selftests/bpf/prog_tests/vmlinux.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include <time.h>
#include "test_vmlinux.skel.h"
#define MY_TV_NSEC 1337
static void nsleep()
{
struct timespec ts = { .tv_nsec = MY_TV_NSEC };
(void)nanosleep(&ts, NULL);
}
void test_vmlinux(void)
{
int duration = 0, err;
struct test_vmlinux* skel;
struct test_vmlinux__bss *bss;
skel = test_vmlinux__open_and_load();
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
bss = skel->bss;
err = test_vmlinux__attach(skel);
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
goto cleanup;
/* trigger everything */
nsleep();
CHECK(!bss->tp_called, "tp", "not called\n");
CHECK(!bss->raw_tp_called, "raw_tp", "not called\n");
CHECK(!bss->tp_btf_called, "tp_btf", "not called\n");
CHECK(!bss->kprobe_called, "kprobe", "not called\n");
CHECK(!bss->fentry_called, "fentry", "not called\n");
cleanup:
test_vmlinux__destroy(skel);
}