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-rw-r--r--tools/testing/selftests/bpf/progs/linked_maps2.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/linked_maps2.c b/tools/testing/selftests/bpf/progs/linked_maps2.c
new file mode 100644
index 000000000..069368747
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/linked_maps2.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+/* modifiers and typedefs are ignored when comparing key/value types */
+typedef struct my_key { long x; } key_type;
+typedef struct my_value { long x; } value_type;
+
+extern struct {
+ __uint(max_entries, 16);
+ __type(key, key_type);
+ __type(value, value_type);
+ __uint(type, BPF_MAP_TYPE_HASH);
+} map1 SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, int);
+ __type(value, int);
+ __uint(max_entries, 8);
+} map2 SEC(".maps");
+
+/* this definition will lose, but it has to exactly match the winner */
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, int);
+ __type(value, int);
+ __uint(max_entries, 16);
+} map_weak __weak SEC(".maps");
+
+int output_first2;
+int output_second2;
+int output_weak2;
+
+SEC("raw_tp/sys_enter")
+int BPF_PROG(handler_enter2)
+{
+ /* update values with key = 2 */
+ int key = 2, val = 2;
+ key_type key_struct = { .x = 2 };
+ value_type val_struct = { .x = 2000 };
+
+ bpf_map_update_elem(&map1, &key_struct, &val_struct, 0);
+ bpf_map_update_elem(&map2, &key, &val, 0);
+ bpf_map_update_elem(&map_weak, &key, &val, 0);
+
+ return 0;
+}
+
+SEC("raw_tp/sys_exit")
+int BPF_PROG(handler_exit2)
+{
+ /* lookup values with key = 1, set in another file */
+ int key = 1, *val;
+ key_type key_struct = { .x = 1 };
+ value_type *value_struct;
+
+ value_struct = bpf_map_lookup_elem(&map1, &key_struct);
+ if (value_struct)
+ output_first2 = value_struct->x;
+
+ val = bpf_map_lookup_elem(&map2, &key);
+ if (val)
+ output_second2 = *val;
+
+ val = bpf_map_lookup_elem(&map_weak, &key);
+ if (val)
+ output_weak2 = *val;
+
+ return 0;
+}
+
+char LICENSE[] SEC("license") = "GPL";