1 files changed, 29 insertions, 9 deletions
diff --git a/tools/testing/selftests/bpf/netcnt_common.h b/tools/testing/selftests/bpf/netcnt_common.h
index 81084c1c2c23..0ab1c88041cd 100644
--- a/tools/testing/selftests/bpf/netcnt_common.h
+++ b/tools/testing/selftests/bpf/netcnt_common.h
@@ -6,19 +6,39 @@
 
 #define MAX_PERCPU_PACKETS 32
 
-struct percpu_net_cnt {
-	__u64 packets;
-	__u64 bytes;
+/* sizeof(struct bpf_local_storage_elem):
+ *
+ * It really is about 128 bytes on x86_64, but allocate more to account for
+ * possible layout changes, different architectures, etc.
+ * The kernel will wrap up to PAGE_SIZE internally anyway.
+ */
+#define SIZEOF_BPF_LOCAL_STORAGE_ELEM		256
 
-	__u64 prev_ts;
+/* Try to estimate kernel's BPF_LOCAL_STORAGE_MAX_VALUE_SIZE: */
+#define BPF_LOCAL_STORAGE_MAX_VALUE_SIZE	(0xFFFF - \
+						 SIZEOF_BPF_LOCAL_STORAGE_ELEM)
 
-	__u64 prev_packets;
-	__u64 prev_bytes;
+#define PCPU_MIN_UNIT_SIZE			32768
+
+union percpu_net_cnt {
+	struct {
+		__u64 packets;
+		__u64 bytes;
+
+		__u64 prev_ts;
+
+		__u64 prev_packets;
+		__u64 prev_bytes;
+	};
+	__u8 data[PCPU_MIN_UNIT_SIZE];
 };
 
-struct net_cnt {
-	__u64 packets;
-	__u64 bytes;
+union net_cnt {
+	struct {
+		__u64 packets;
+		__u64 bytes;
+	};
+	__u8 data[BPF_LOCAL_STORAGE_MAX_VALUE_SIZE];
 };
 
 #endif