1 files changed, 72 insertions, 0 deletions
diff --git a/src/msg/async/dpdk/IPChecksum.h b/src/msg/async/dpdk/IPChecksum.h
new file mode 100644
index 00000000..9af4a86b
--- /dev/null
+++ b/src/msg/async/dpdk/IPChecksum.h
@@ -0,0 +1,72 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2014 Cloudius Systems, Ltd.
+ */
+
+#ifndef CEPH_MSG_CHECKSUM_H_
+#define CEPH_MSG_CHECKSUM_H_
+
+#include <cstdint>
+#include <cstddef>
+#include <arpa/inet.h>
+
+#include "Packet.h"
+
+uint16_t ip_checksum(const void* data, size_t len);
+
+struct checksummer {
+  __int128 csum = 0;
+  bool odd = false;
+  void sum(const char* data, size_t len);
+  void sum(const Packet& p);
+  void sum(uint8_t data) {
+    if (!odd) {
+      csum += data << 8;
+    } else {
+      csum += data;
+    }
+    odd = !odd;
+  }
+  void sum(uint16_t data) {
+    if (odd) {
+      sum(uint8_t(data >> 8));
+      sum(uint8_t(data));
+    } else {
+      csum += data;
+    }
+  }
+  void sum(uint32_t data) {
+    if (odd) {
+      sum(uint16_t(data));
+      sum(uint16_t(data >> 16));
+    } else {
+      csum += data;
+    }
+  }
+  void sum_many() {}
+  template <typename T0, typename... T>
+  void sum_many(T0 data, T... rest) {
+    sum(data);
+    sum_many(rest...);
+  }
+  uint16_t get() const;
+};
+
+#endif /* CEPH_MSG_CHECKSUM_H_ */