[RFC][PATCH -mm] Add genetlink utilities for payload length calculation

[Balbir Singh <balbir@in.ibm.com>]

Add two utility helper functions genlmsg_msg_size() and genlmsg_total_size().
These functions are derived from their netlink counterparts.

Signed-off-by: Balbir Singh <balbir@in.ibm.com>
---

 include/net/genetlink.h |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+)

diff -puN include/net/genetlink.h~genetlink-payload-size-helpers include/net/genetlink.h
--- linux-2.6.18-rc6/include/net/genetlink.h~genetlink-payload-size-helpers	2006-09-11 10:34:56.000000000 +0530
+++ linux-2.6.18-rc6-balbir/include/net/genetlink.h	2006-09-11 11:42:37.000000000 +0530
@@ -171,4 +171,22 @@ static inline int genlmsg_len(const stru
 	return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
 }
 
+/**
+ * genlmsg_msg_size - length of genetlink message not including padding
+ * @payload: length of message payload
+ */
+static inline int genlmsg_msg_size(int payload)
+{
+	return GENL_HDRLEN + payload;
+}
+
+/**
+ * genlmsg_total_size - length of genetlink message including padding
+ * @payload: length of message payload
+ */
+static inline int genlmsg_total_size(int payload)
+{
+	return NLMSG_ALIGN(genlmsg_msg_size(payload));
+}
+
 #endif	/* __NET_GENERIC_NETLINK_H */
_

-- 

	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs