netdev - [PATCH RFC v2 03/21] net: rbridge: add RBridge structure

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Message-Id: <1441122196-11662-4-git-send-email-ahmed@gandi.net>
Date:	Tue,  1 Sep 2015 17:42:58 +0200
From:	Ahmed Amamou <ahmed@...di.net>
To:	netdev@...r.kernel.org
Cc:	William Dauchy <william@...di.net>, Ahmed Amamou <ahmed@...di.net>,
	Kamel Haddadou <kamel@...di.net>
Subject: [PATCH RFC v2 03/21] net: rbridge: add RBridge structure

add basic RBridge structure
add basic TRILL constant
define rbr_nickinfo structure which represent distant RBridge information

Signed-off-by: Ahmed Amamou <ahmed@...di.net>
Signed-off-by: Kamel Haddadou <kamel@...di.net>
---
 net/bridge/rbr_private.h | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 net/bridge/rbr_private.h

diff --git a/net/bridge/rbr_private.h b/net/bridge/rbr_private.h
new file mode 100644
index 0000000..8d9fb4c
--- /dev/null
+++ b/net/bridge/rbr_private.h
@@ -0,0 +1,60 @@
+#ifndef _RBR_PRIVATE_H
+#define _RBR_PRIVATE_H
+
+#include <linux/atomic.h>
+
+#define	RBRIDGE_NICKNAME_MIN	0x0000
+#define	RBRIDGE_NICKNAME_MAX	0xFFFF
+
+/* Define well-known nicknames */
+#define	RBRIDGE_NICKNAME_NONE	RBRIDGE_NICKNAME_MIN
+#define	RBRIDGE_NICKNAME_UNUSED	RBRIDGE_NICKNAME_MAX
+
+#define	TRILL_PROTOCOL_VERS 0	/* th_version */
+#define	TRILL_DEFAULT_HOPS 21	/* th_hopcount */
+#define VALID_NICK(n)	((n) != RBRIDGE_NICKNAME_NONE && \
+			(n) != RBRIDGE_NICKNAME_UNUSED)
+
+struct rbr_nickinfo {
+	/* Nickname of the RBridge */
+	u16 nick;
+	/* Next-hop SNPA address to reach this RBridge */
+	u8 adjsnpa[ETH_ALEN];
+	/* Link on our system to use to reach next-hop */
+	u32 linkid;
+	/* Num of *our* adjacencies on a tree rooted at this RBridge */
+	u16 adjcount;
+	/* Num of distribution tree root nicks chosen by this RBridge */
+	u16 dtrootcount;
+	/* Variable size bytes to store adjacency nicks, distribution
+	 * tree roots. Adjacency nicks and
+	 * distribution tree roots are 16-bit fields.
+	 */
+};
+
+struct rbr_node {
+	struct rbr_nickinfo *rbr_ni;
+	atomic_t refs;		/* reference count */
+};
+
+struct rbr {
+	u16 nick;		/* our nickname */
+	u16 treeroot;	/* tree root nickname */
+	struct rbr_node *rbr_nodes[RBRIDGE_NICKNAME_MAX];
+	struct net_bridge *br;	/* back pointer */
+};
+
+/* Access the adjacency nick list at the end of rbr_nickinfo */
+#define	RBR_NI_ADJNICKSPTR(v) ((u16 *)((struct rbr_nickinfo *)(v) + 1))
+#define	RBR_NI_ADJNICK(v, n) (RBR_NI_ADJNICKSPTR(v)[(n)])
+
+/* Access the DT root nick list in rbr_nickinfo after adjacency nicks */
+#define	RBR_NI_DTROOTNICKSPTR(v) (RBR_NI_ADJNICKSPTR(v) + (v)->adjcount)
+#define	RBR_NI_DTROOTNICK(v, n) (RBR_NI_DTROOTNICKSPTR(v)[(n)])
+
+#define	RBR_NI_TOTALSIZE(v) (\
+		(sizeof(struct rbr_nickinfo)) + \
+		(sizeof(u16) * (v)->adjcount) + \
+		(sizeof(u16) * (v)->dtrootcount)\
+		)
+#endif
-- 
2.1.4

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