[PATCH RFC bpf-next v1 32/32] selftests/bpf: Add referenced local kptr tests

[Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>]

Add some cases where success and failure at verification time is
tested.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
---
 .../selftests/bpf/prog_tests/map_kptr.c       |  2 +-
 tools/testing/selftests/bpf/progs/map_kptr.c  | 38 +++++++++++++++++++
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/map_kptr.c b/tools/testing/selftests/bpf/prog_tests/map_kptr.c
index fdcea7a61491..f2608a3e4e0d 100644
--- a/tools/testing/selftests/bpf/prog_tests/map_kptr.c
+++ b/tools/testing/selftests/bpf/prog_tests/map_kptr.c
@@ -91,7 +91,7 @@ static void test_map_kptr_success(bool test_run)
 	);
 	struct map_kptr *skel;
 	int key = 0, ret;
-	char buf[16];
+	char buf[24];
 
 	skel = map_kptr__open_and_load();
 	if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load"))
diff --git a/tools/testing/selftests/bpf/progs/map_kptr.c b/tools/testing/selftests/bpf/progs/map_kptr.c
index eb8217803493..30c981be008b 100644
--- a/tools/testing/selftests/bpf/progs/map_kptr.c
+++ b/tools/testing/selftests/bpf/progs/map_kptr.c
@@ -2,10 +2,17 @@
 #include <vmlinux.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_helpers.h>
+#include <bpf/bpf_core_read.h>
+#include "bpf_experimental.h"
+
+struct foo {
+	int data;
+};
 
 struct map_value {
 	struct prog_test_ref_kfunc __kptr *unref_ptr;
 	struct prog_test_ref_kfunc __kptr_ref *ref_ptr;
+	struct foo __kptr_ref __local *lref_ptr;
 };
 
 struct array_map {
@@ -130,11 +137,42 @@ static void test_kptr_get(struct map_value *v)
 	bpf_kfunc_call_test_release(p);
 }
 
+static void test_local_kptr_ref(struct map_value *v)
+{
+	struct foo *p;
+
+	p = v->lref_ptr;
+	if (!p)
+		return;
+	if (p->data > 100)
+		return;
+	/* store NULL */
+	p = bpf_kptr_xchg(&v->lref_ptr, NULL);
+	if (!p)
+		return;
+	if (p->data > 100) {
+		p->data = 0;
+		bpf_kptr_free(p);
+		return;
+	}
+	bpf_kptr_free(p);
+
+	p = bpf_kptr_alloc(bpf_core_type_id_local(struct foo), 0);
+	if (!p)
+		return;
+	/* store ptr_ */
+	p = bpf_kptr_xchg(&v->lref_ptr, p);
+	if (!p)
+		return;
+	bpf_kptr_free(p);
+}
+
 static void test_kptr(struct map_value *v)
 {
 	test_kptr_unref(v);
 	test_kptr_ref(v);
 	test_kptr_get(v);
+	test_local_kptr_ref(v);
 }
 
 SEC("tc")
-- 
2.34.1