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selftests/bpf: Test kernel module ksym externs

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Add per-CPU variable to bpf_testmod.ko and use those from new selftest to
validate it works end-to-end.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/bpf/20210112075520.4103414-8-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-01-11 23:55:20 -08:00 committed by Alexei Starovoitov
parent 284d2587ea
commit 430d97a8a7
3 changed files with 60 additions and 0 deletions
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3
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
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@ -3,6 +3,7 @@
#include <linux/error-injection.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/percpu-defs.h>
#include <linux/sysfs.h>
#include <linux/tracepoint.h>
#include "bpf_testmod.h"
@ -10,6 +11,8 @@
#define CREATE_TRACE_POINTS
#include "bpf_testmod-events.h"
DEFINE_PER_CPU(int, bpf_testmod_ksym_percpu) = 123;
noinline ssize_t
bpf_testmod_test_read(struct file *file, struct kobject *kobj,
struct bin_attribute *bin_attr,

31
tools/testing/selftests/bpf/prog_tests/ksyms_module.c Normal file
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@ -0,0 +1,31 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include <bpf/libbpf.h>
#include <bpf/btf.h>
#include "test_ksyms_module.skel.h"
static int duration;
void test_ksyms_module(void)
{
struct test_ksyms_module* skel;
int err;
skel = test_ksyms_module__open_and_load();
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
err = test_ksyms_module__attach(skel);
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
goto cleanup;
usleep(1);
ASSERT_EQ(skel->bss->triggered, true, "triggered");
ASSERT_EQ(skel->bss->out_mod_ksym_global, 123, "global_ksym_val");
cleanup:
test_ksyms_module__destroy(skel);
}

26
tools/testing/selftests/bpf/progs/test_ksyms_module.c Normal file
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@ -0,0 +1,26 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
extern const int bpf_testmod_ksym_percpu __ksym;
int out_mod_ksym_global = 0;
bool triggered = false;
SEC("raw_tp/sys_enter")
int handler(const void *ctx)
{
int *val;
__u32 cpu;
val = (int *)bpf_this_cpu_ptr(&bpf_testmod_ksym_percpu);
out_mod_ksym_global = *val;
triggered = true;
return 0;
}
char LICENSE[] SEC("license") = "GPL";