netdev - [PATCH 1/7] neigh: Create mechanism for generic neigh private areas.

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Message-Id: <20111130.224131.726739875792706779.davem@davemloft.net>
Date:	Wed, 30 Nov 2011 22:41:31 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH 1/7] neigh: Create mechanism for generic neigh private
 areas.


The implementation private sits right after the primary_key memory.

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 include/net/neighbour.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 7ae5acf..87c0e5c 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -179,6 +179,13 @@ struct neigh_table {
 	struct pneigh_entry	**phash_buckets;
 };
 
+#define NEIGH_PRIV_ALIGN	sizeof(long long)
+
+static inline void *neighbour_priv(const struct neighbour *n)
+{
+	return (char *)n + ALIGN(sizeof(*n) + n->tbl->key_len, NEIGH_PRIV_ALIGN);
+}
+
 /* flags for neigh_update() */
 #define NEIGH_UPDATE_F_OVERRIDE			0x00000001
 #define NEIGH_UPDATE_F_WEAK_OVERRIDE		0x00000002
-- 
1.7.6.4

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