[SCSI] fcoe: Add a header file defining the FIP protocol for FCoE.

Adds include/scsi/fc/fc_fip.h for FIP protocol definitions.
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

include/scsi/fc/fc_fip.h

+/*
+ * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef _FC_FIP_H_
+#define _FC_FIP_H_
+
+/*
+ * This version is based on:
+ * http://www.t11.org/ftp/t11/pub/fc/bb-5/08-543v1.pdf
+ */
+
+/*
+ * The FIP ethertype eventually goes in net/if_ether.h.
+ */
+#ifndef ETH_P_FIP
+#define ETH_P_FIP	0x8914	/* FIP Ethertype */
+#endif
+
+#define FIP_DEF_PRI	128	/* default selection priority */
+#define FIP_DEF_FC_MAP	0x0efc00 /* default FCoE MAP (MAC OUI) value */
+#define FIP_DEF_FKA	8000	/* default FCF keep-alive/advert period (mS) */
+#define FIP_VN_KA_PERIOD 90000	/* required VN_port keep-alive period (mS) */
+#define FIP_FCF_FUZZ	100	/* random time added by FCF (mS) */
+
+/*
+ * Multicast MAC addresses.  T11-adopted.
+ */
+#define FIP_ALL_FCOE_MACS	((u8[6]) { 1, 0x10, 0x18, 1, 0, 0 })
+#define FIP_ALL_ENODE_MACS	((u8[6]) { 1, 0x10, 0x18, 1, 0, 1 })
+#define FIP_ALL_FCF_MACS	((u8[6]) { 1, 0x10, 0x18, 1, 0, 2 })
+
+#define FIP_VER		1		/* version for fip_header */
+
+struct fip_header {
+	__u8	fip_ver;		/* upper 4 bits are the version */
+	__u8	fip_resv1;		/* reserved */
+	__be16	fip_op;			/* operation code */
+	__u8	fip_resv2;		/* reserved */
+	__u8	fip_subcode;		/* lower 4 bits are sub-code */
+	__be16	fip_dl_len;		/* length of descriptors in words */
+	__be16	fip_flags;		/* header flags */
+} __attribute__((packed));
+
+#define FIP_VER_SHIFT	4
+#define FIP_VER_ENCAPS(v) ((v) << FIP_VER_SHIFT)
+#define FIP_VER_DECAPS(v) ((v) >> FIP_VER_SHIFT)
+#define FIP_BPW		4		/* bytes per word for lengths */
+
+/*
+ * fip_op.
+ */
+enum fip_opcode {
+	FIP_OP_DISC =	1,		/* discovery, advertisement, etc. */
+	FIP_OP_LS =	2,		/* Link Service request or reply */
+	FIP_OP_CTRL =	3,		/* Keep Alive / Link Reset */
+	FIP_OP_VLAN =	4,		/* VLAN discovery */
+	FIP_OP_VENDOR_MIN = 0xfff8,	/* min vendor-specific opcode */
+	FIP_OP_VENDOR_MAX = 0xfffe,	/* max vendor-specific opcode */
+};
+
+/*
+ * Subcodes for FIP_OP_DISC.
+ */
+enum fip_disc_subcode {
+	FIP_SC_SOL =	1,		/* solicitation */
+	FIP_SC_ADV =	2,		/* advertisement */
+};
+
+/*
+ * Subcodes for FIP_OP_LS.
+ */
+enum fip_trans_subcode {
+	FIP_SC_REQ =	1,		/* request */
+	FIP_SC_REP =	2,		/* reply */
+};
+
+/*
+ * Subcodes for FIP_OP_RESET.
+ */
+enum fip_reset_subcode {
+	FIP_SC_KEEP_ALIVE = 1,		/* keep-alive from VN_Port */
+	FIP_SC_CLR_VLINK = 2,		/* clear virtual link from VF_Port */
+};
+
+/*
+ * Subcodes for FIP_OP_VLAN.
+ */
+enum fip_vlan_subcode {
+	FIP_SC_VL_REQ =	1,		/* request */
+	FIP_SC_VL_REP =	2,		/* reply */
+};
+
+/*
+ * flags in header fip_flags.
+ */
+enum fip_flag {
+	FIP_FL_FPMA =	0x8000,		/* supports FPMA fabric-provided MACs */
+	FIP_FL_SPMA =	0x4000,		/* supports SPMA server-provided MACs */
+	FIP_FL_AVAIL =	0x0004,		/* available for FLOGI/ELP */
+	FIP_FL_SOL =	0x0002,		/* this is a solicited message */
+	FIP_FL_FPORT =	0x0001,		/* sent from an F port */
+};
+
+/*
+ * Common descriptor header format.
+ */
+struct fip_desc {
+	__u8	fip_dtype;		/* type - see below */
+	__u8	fip_dlen;		/* length - in 32-bit words */
+};
+
+enum fip_desc_type {
+	FIP_DT_PRI =	1,		/* priority for forwarder selection */
+	FIP_DT_MAC =	2,		/* MAC address */
+	FIP_DT_MAP_OUI = 3,		/* FC-MAP OUI */
+	FIP_DT_NAME =	4,		/* switch name or node name */
+	FIP_DT_FAB =	5,		/* fabric descriptor */
+	FIP_DT_FCOE_SIZE = 6,		/* max FCoE frame size */
+	FIP_DT_FLOGI =	7,		/* FLOGI request or response */
+	FIP_DT_FDISC =	8,		/* FDISC request or response */
+	FIP_DT_LOGO =	9,		/* LOGO request or response */
+	FIP_DT_ELP =	10,		/* ELP request or response */
+	FIP_DT_VN_ID =	11,		/* VN_Node Identifier */
+	FIP_DT_FKA =	12,		/* advertisement keep-alive period */
+	FIP_DT_VENDOR =	13,		/* vendor ID */
+	FIP_DT_VLAN =	14,		/* vlan number */
+	FIP_DT_LIMIT,			/* max defined desc_type + 1 */
+	FIP_DT_VENDOR_BASE = 128,	/* first vendor-specific desc_type */
+};
+
+/*
+ * FIP_DT_PRI - priority descriptor.
+ */
+struct fip_pri_desc {
+	struct fip_desc fd_desc;
+	__u8		fd_resvd;
+	__u8		fd_pri;		/* FCF priority:  higher is better */
+} __attribute__((packed));
+
+/*
+ * FIP_DT_MAC - MAC address descriptor.
+ */
+struct fip_mac_desc {
+	struct fip_desc fd_desc;
+	__u8		fd_mac[ETH_ALEN];
+} __attribute__((packed));
+
+/*
+ * FIP_DT_MAP - descriptor.
+ */
+struct fip_map_desc {
+	struct fip_desc fd_desc;
+	__u8		fd_resvd[3];
+	__u8		fd_map[3];
+} __attribute__((packed));
+
+/*
+ * FIP_DT_NAME descriptor.
+ */
+struct fip_wwn_desc {
+	struct fip_desc fd_desc;
+	__u8		fd_resvd[2];
+	__be64		fd_wwn;		/* 64-bit WWN, unaligned */
+} __attribute__((packed));
+
+/*
+ * FIP_DT_FAB descriptor.
+ */
+struct fip_fab_desc {
+	struct fip_desc fd_desc;
+	__be16		fd_vfid;	/* virtual fabric ID */
+	__u8		fd_resvd;
+	__u8		fd_map[3];	/* FC-MAP value */
+	__be64		fd_wwn;		/* fabric name, unaligned */
+} __attribute__((packed));
+
+/*
+ * FIP_DT_FCOE_SIZE descriptor.
+ */
+struct fip_size_desc {
+	struct fip_desc fd_desc;
+	__be16		fd_size;
+} __attribute__((packed));
+
+/*
+ * Descriptor that encapsulates an ELS or ILS frame.
+ * The encapsulated frame immediately follows this header, without
+ * SOF, EOF, or CRC.
+ */
+struct fip_encaps {
+	struct fip_desc fd_desc;
+	__u8		fd_resvd[2];
+} __attribute__((packed));
+
+/*
+ * FIP_DT_VN_ID - VN_Node Identifier descriptor.
+ */
+struct fip_vn_desc {
+	struct fip_desc fd_desc;
+	__u8		fd_mac[ETH_ALEN];
+	__u8		fd_resvd;
+	__u8		fd_fc_id[3];
+	__be64		fd_wwpn;	/* port name, unaligned */
+} __attribute__((packed));
+
+/*
+ * FIP_DT_FKA - Advertisement keep-alive period.
+ */
+struct fip_fka_desc {
+	struct fip_desc fd_desc;
+	__u8		fd_resvd[2];
+	__be32		fd_fka_period;	/* adv./keep-alive period in mS */
+} __attribute__((packed));
+
+/*
+ * FIP_DT_VENDOR descriptor.
+ */
+struct fip_vendor_desc {
+	struct fip_desc fd_desc;
+	__u8		fd_resvd[2];
+	__u8		fd_vendor_id[8];
+} __attribute__((packed));
+
+#endif /* _FC_FIP_H_ */