Add per-CPU variable to bpf_testmod.ko and use those from new selftest to
validate it works end-to-end.
Acked-by: Yonghong Song <yhs@xxxxxx>
Acked-by: Hao Luo <haoluo@xxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
.../selftests/bpf/bpf_testmod/bpf_testmod.c | 3 ++
.../selftests/bpf/prog_tests/ksyms_module.c | 31 +++++++++++++++++++
.../selftests/bpf/progs/test_ksyms_module.c | 26 ++++++++++++++++
3 files changed, 60 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/ksyms_module.c
create mode 100644 tools/testing/selftests/bpf/progs/test_ksyms_module.c
diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
index 2df19d73ca49..0b991e115d1f 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
@@ -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,
diff --git a/tools/testing/selftests/bpf/prog_tests/ksyms_module.c b/tools/testing/selftests/bpf/prog_tests/ksyms_module.c
new file mode 100644
index 000000000000..4c232b456479
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/ksyms_module.c
@@ -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);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_ksyms_module.c b/tools/testing/selftests/bpf/progs/test_ksyms_module.c
new file mode 100644
index 000000000000..d6a0b3086b90
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_ksyms_module.c
@@ -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";
--
2.24.1
