netdev - [PATCH RFC v2 01/21] net: rbridge: add trill frame description

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Message-Id: <1441122196-11662-2-git-send-email-ahmed@gandi.net>
Date:	Tue,  1 Sep 2015 17:42:56 +0200
From:	Ahmed Amamou <ahmed@...di.net>
To:	netdev@...r.kernel.org
Cc:	William Dauchy <william@...di.net>, Ahmed Amamou <ahmed@...di.net>,
	Emmanuel Hocdet <manu@...di.net>,
	Kamel Haddadou <kamel@...di.net>
Subject: [PATCH RFC v2 01/21] net: rbridge: add trill frame description

add basic trill header description and basic header getter and setter
functions

Signed-off-by: Ahmed Amamou <ahmed@...di.net>
Signed-off-by: Emmanuel Hocdet <manu@...di.net>
Signed-off-by: Kamel Haddadou <kamel@...di.net>
---
 include/net/if_trill.h        | 88 +++++++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/if_ether.h |  1 +
 2 files changed, 89 insertions(+)
 create mode 100644 include/net/if_trill.h

diff --git a/include/net/if_trill.h b/include/net/if_trill.h
new file mode 100644
index 0000000..c4caf58
--- /dev/null
+++ b/include/net/if_trill.h
@@ -0,0 +1,88 @@
+#ifndef _LINUX_IF_TRILL_H_
+#define _LINUX_IF_TRILL_H_
+
+#include <linux/types.h>
+
+/* trill_hdr structure
+ *                                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *                                | V | R |M|op-Length| Hop Count |
+ *+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *|  Egress RBridge Nickname      |    Ingress RBridge Nickname   |
+ *+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+struct trill_hdr {
+	__be16 th_flags;
+	__be16 th_egressnick;
+	__be16 th_ingressnick;
+} __packed;
+
+static inline u16 trill_get_version(u16 trill_flags)
+{
+	return (trill_flags >> 14) & 0x0003;
+}
+
+static inline u16 trill_set_version(u16 trill_flags, u16 v)
+{
+	trill_flags |= (v & 0x0003) << 14;
+	return trill_flags;
+}
+
+static inline u16 trill_get_reserved(u16 trill_flags)
+{
+	return (trill_flags >> 12) & 0x0003;
+}
+
+static inline u16 trill_set_reserved(u16 trill_flags, u16 v)
+{
+	trill_flags |= (v & 0x0003) << 12;
+	return trill_flags;
+}
+
+static inline u16 trill_get_multidest(u16 trill_flags)
+{
+	return (trill_flags >> 11) & 0x0001;
+}
+
+static inline u16 trill_set_multidest(u16 trill_flags, u16 flag)
+{
+	trill_flags |= (flag & 0x0001) << 11;
+	return trill_flags;
+}
+
+/* len is in 4 bytes units << 2*/
+static inline size_t trill_get_optslen(u16 trill_flags)
+{
+	return ((trill_flags >> 6) & 0x001F) << 2;
+}
+
+static inline u16 trill_set_optslen(u16 trill_flags, u16 len)
+{
+	trill_flags |= ((len >> 2) & 0x001F) << 6;
+	return trill_flags;
+}
+
+static inline u16 trill_get_hopcount(u16 trill_flags)
+{
+	return trill_flags & 0x003F;
+}
+
+static inline u16 trill_set_hopcount(u16 trill_flags, u16 count)
+{
+	trill_flags |= count & 0x003F;
+	return trill_flags;
+}
+
+static inline void trillhdr_dec_hopcount(struct trill_hdr *trh)
+{
+	u8 *flags = (u8 *) &trh->th_flags;
+
+	if (flags[1] & 0x3F)
+		flags[1] -= 1;
+}
+
+static inline size_t trill_header_len(struct trill_hdr *trh)
+{
+	return sizeof(*trh) + trill_get_optslen(ntohs(trh->th_flags));
+}
+#endif /* _LINUX_IF_TRILL_H_ */
diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index aa63ed0..5cd75b6 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -48,6 +48,7 @@
 #define	ETH_P_BPQ	0x08FF		/* G8BPQ AX.25 Ethernet Packet	[ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_IEEEPUP	0x0a00		/* Xerox IEEE802.3 PUP packet */
 #define ETH_P_IEEEPUPAT	0x0a01		/* Xerox IEEE802.3 PUP Addr Trans packet */
+#define ETH_P_TRILL	0x22F3		/* TRILL frames RFC 6325 */
 #define ETH_P_BATMAN	0x4305		/* B.A.T.M.A.N.-Advanced packet [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_DEC       0x6000          /* DEC Assigned proto           */
 #define ETH_P_DNA_DL    0x6001          /* DEC DNA Dump/Load            */
-- 
2.1.4

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