netdev-linux: New functions for converting netdev stats formats.

An upcoming commit will introduce another function that needs to convert
between rtnl_link_stats64 and netdev_stats, so it seemed best to just add
functions to do the conversion.

lib/netdev-linux.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2011 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * 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.
+ */
+
+#ifndef NETDEV_LINUX_H
+#define NETDEV_LINUX_H 1
+
+/* These functions are Linux specific, so they should be used directly only by
+ * Linux-specific code. */
+
+struct netdev_stats;
+struct rtnl_link_stats;
+struct rtnl_link_stats64;
+
+void netdev_stats_from_rtnl_link_stats(struct netdev_stats *dst,
+                                       const struct rtnl_link_stats *src);
+void netdev_stats_from_rtnl_link_stats64(struct netdev_stats *dst,
+                                         const struct rtnl_link_stats64 *src);
+void netdev_stats_to_rtnl_link_stats64(struct rtnl_link_stats64 *dst,
+                                       const struct netdev_stats *src);
+
+#endif /* netdev-linux.h */