The test covers basic re-use of a pinned DEVMAP map,
with both matching and mismatching parameters.
Signed-off-by: Yureka Lilian <yuka@xxxxxxxx>
---
.../bpf/prog_tests/pinning_devmap_reuse.c | 50 +++++++++++++++++++
.../selftests/bpf/progs/test_pinning_devmap.c | 20 ++++++++
2 files changed, 70 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/pinning_devmap_reuse.c
create mode 100644 tools/testing/selftests/bpf/progs/test_pinning_devmap.c
diff --git a/tools/testing/selftests/bpf/prog_tests/pinning_devmap_reuse.c b/tools/testing/selftests/bpf/prog_tests/pinning_devmap_reuse.c
new file mode 100644
index 000000000..9ae49b587
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/pinning_devmap_reuse.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <test_progs.h>
+
+
+#include "test_pinning_devmap.skel.h"
+
+void test_pinning_devmap_reuse(void)
+{
+ const char *pinpath1 = "/sys/fs/bpf/pinmap1";
+ const char *pinpath2 = "/sys/fs/bpf/pinmap2";
+ struct test_pinning_devmap *skel1 = NULL, *skel2 = NULL;
+ int err;
+ DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);
+
+ /* load the object a first time */
+ skel1 = test_pinning_devmap__open_and_load();
+ if (!ASSERT_OK_PTR(skel1, "skel_load1"))
+ goto out;
+
+ /* load the object a second time, re-using the pinned map */
+ skel2 = test_pinning_devmap__open_and_load();
+ if (!ASSERT_OK_PTR(skel2, "skel_load2"))
+ goto out;
+
+ /* we can close the reference safely without
+ * the map's refcount falling to 0
+ */
+ test_pinning_devmap__destroy(skel1);
+ skel1 = NULL;
+
+ /* now, swap the pins */
+ err = renameat2(0, pinpath1, 0, pinpath2, RENAME_EXCHANGE);
+ if (!ASSERT_OK(err, "swap pins"))
+ goto out;
+
+ /* load the object again, this time the re-use should fail */
+ skel1 = test_pinning_devmap__open_and_load();
+ if (!ASSERT_ERR_PTR(skel1, "skel_load3"))
+ goto out;
+
+out:
+ unlink(pinpath1);
+ unlink(pinpath2);
+ test_pinning_devmap__destroy(skel1);
+ test_pinning_devmap__destroy(skel2);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_pinning_devmap.c b/tools/testing/selftests/bpf/progs/test_pinning_devmap.c
new file mode 100644
index 000000000..c855f8f87
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_pinning_devmap.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+struct {
+ __uint(type, BPF_MAP_TYPE_DEVMAP);
+ __uint(max_entries, 1);
+ __type(key, __u32);
+ __type(value, __u32);
+ __uint(pinning, LIBBPF_PIN_BY_NAME);
+} pinmap1 SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_DEVMAP);
+ __uint(max_entries, 2);
+ __type(key, __u32);
+ __type(value, __u32);
+ __uint(pinning, LIBBPF_PIN_BY_NAME);
+} pinmap2 SEC(".maps");
--
2.50.1
