/*

   *  FiberChannel transport specific attributes exported to sysfs.
   *
   *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   *  ========
   *

   *  Copyright (C) 2004-2007   James Smart, Emulex Corporation

   *    Rewrite for host, target, device, and remote port attributes,
   *    statistics, and service functions...
   *
   */
  #ifndef SCSI_TRANSPORT_FC_H
  #define SCSI_TRANSPORT_FC_H

  #include <linux/sched.h>

  #include <asm/unaligned.h>

  #include <scsi/scsi.h>

  #include <scsi/scsi_netlink.h>

  
  struct scsi_transport_template;

  /*
   * FC Port definitions - Following FC HBAAPI guidelines
   *
   * Note: Not all binary values for the different fields match HBAAPI.
   *  Instead, we use densely packed ordinal values or enums.
   *  We get away with this as we never present the actual binary values
   *  externally. For sysfs, we always present the string that describes
   *  the value. Thus, an admin doesn't need a magic HBAAPI decoder ring
   *  to understand the values. The HBAAPI user-space library is free to
   *  convert the strings into the HBAAPI-specified binary values.
   *
   * Note: Not all HBAAPI-defined values are contained in the definitions
   *  below. Those not appropriate to an fc_host (e.g. FCP initiator) have
   *  been removed.
   */
  
  /*
   * fc_port_type: If you alter this, you also need to alter scsi_transport_fc.c
   * (for the ascii descriptions).
   */
  enum fc_port_type {
  	FC_PORTTYPE_UNKNOWN,
  	FC_PORTTYPE_OTHER,
  	FC_PORTTYPE_NOTPRESENT,
  	FC_PORTTYPE_NPORT,		/* Attached to FPort */
  	FC_PORTTYPE_NLPORT,		/* (Public) Loop w/ FLPort */
  	FC_PORTTYPE_LPORT,		/* (Private) Loop w/o FLPort */
  	FC_PORTTYPE_PTP,		/* Point to Point w/ another NPort */

  	FC_PORTTYPE_NPIV,		/* VPORT based on NPIV */

  };

  /*
   * fc_port_state: If you alter this, you also need to alter scsi_transport_fc.c
   * (for the ascii descriptions).
   */
  enum fc_port_state {
  	FC_PORTSTATE_UNKNOWN,
  	FC_PORTSTATE_NOTPRESENT,
  	FC_PORTSTATE_ONLINE,
  	FC_PORTSTATE_OFFLINE,		/* User has taken Port Offline */
  	FC_PORTSTATE_BLOCKED,
  	FC_PORTSTATE_BYPASSED,
  	FC_PORTSTATE_DIAGNOSTICS,
  	FC_PORTSTATE_LINKDOWN,
  	FC_PORTSTATE_ERROR,
  	FC_PORTSTATE_LOOPBACK,

  	FC_PORTSTATE_DELETED,

  };

  /*
   * fc_vport_state: If you alter this, you also need to alter
   * scsi_transport_fc.c (for the ascii descriptions).
   */
  enum fc_vport_state {
  	FC_VPORT_UNKNOWN,
  	FC_VPORT_ACTIVE,
  	FC_VPORT_DISABLED,
  	FC_VPORT_LINKDOWN,
  	FC_VPORT_INITIALIZING,
  	FC_VPORT_NO_FABRIC_SUPP,
  	FC_VPORT_NO_FABRIC_RSCS,
  	FC_VPORT_FABRIC_LOGOUT,
  	FC_VPORT_FABRIC_REJ_WWN,
  	FC_VPORT_FAILED,
  };

  /*

   * FC Classes of Service
   * Note: values are not enumerated, as they can be "or'd" together
   * for reporting (e.g. report supported_classes). If you alter this list,
   * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
   */
  #define FC_COS_UNSPECIFIED		0
  #define FC_COS_CLASS1			2
  #define FC_COS_CLASS2			4
  #define FC_COS_CLASS3			8
  #define FC_COS_CLASS4			0x10
  #define FC_COS_CLASS6			0x40

  /*

   * FC Port Speeds
   * Note: values are not enumerated, as they can be "or'd" together
   * for reporting (e.g. report supported_speeds). If you alter this list,
   * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
   */
  #define FC_PORTSPEED_UNKNOWN		0 /* Unknown - transceiver
  					     incapable of reporting */
  #define FC_PORTSPEED_1GBIT		1
  #define FC_PORTSPEED_2GBIT		2

  #define FC_PORTSPEED_10GBIT		4
  #define FC_PORTSPEED_4GBIT		8

  #define FC_PORTSPEED_8GBIT		0x10
  #define FC_PORTSPEED_16GBIT		0x20

  #define FC_PORTSPEED_32GBIT		0x40

  #define FC_PORTSPEED_20GBIT		0x80
  #define FC_PORTSPEED_40GBIT		0x100
  #define FC_PORTSPEED_50GBIT		0x200
  #define FC_PORTSPEED_100GBIT		0x400

  #define FC_PORTSPEED_25GBIT		0x800

  #define FC_PORTSPEED_NOT_NEGOTIATED	(1 << 15) /* Speed not established */
  
  /*
   * fc_tgtid_binding_type: If you alter this, you also need to alter
   * scsi_transport_fc.c (for the ascii descriptions).
   */
  enum fc_tgtid_binding_type  {
  	FC_TGTID_BIND_NONE,
  	FC_TGTID_BIND_BY_WWPN,
  	FC_TGTID_BIND_BY_WWNN,
  	FC_TGTID_BIND_BY_ID,
  };
  
  /*

   * FC Port Roles

   * Note: values are not enumerated, as they can be "or'd" together
   * for reporting (e.g. report roles). If you alter this list,
   * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
   */

  #define FC_PORT_ROLE_UNKNOWN			0x00
  #define FC_PORT_ROLE_FCP_TARGET			0x01
  #define FC_PORT_ROLE_FCP_INITIATOR		0x02
  #define FC_PORT_ROLE_IP_PORT			0x04
  
  /* The following are for compatibility */
  #define FC_RPORT_ROLE_UNKNOWN			FC_PORT_ROLE_UNKNOWN
  #define FC_RPORT_ROLE_FCP_TARGET		FC_PORT_ROLE_FCP_TARGET
  #define FC_RPORT_ROLE_FCP_INITIATOR		FC_PORT_ROLE_FCP_INITIATOR
  #define FC_RPORT_ROLE_IP_PORT			FC_PORT_ROLE_IP_PORT
  
  
  /* Macro for use in defining Virtual Port attributes */

  #define FC_VPORT_ATTR(_name,_mode,_show,_store)		\
  struct device_attribute dev_attr_vport_##_name = 	\

  	__ATTR(_name,_mode,_show,_store)

  /*
   * fc_vport_identifiers: This set of data contains all elements
   * to uniquely identify and instantiate a FC virtual port.
   *
   * Notes:
   *   symbolic_name: The driver is to append the symbolic_name string data
   *      to the symbolic_node_name data that it generates by default.
   *      the resulting combination should then be registered with the switch.
   *      It is expected that things like Xen may stuff a VM title into
   *      this field.
   */
  #define FC_VPORT_SYMBOLIC_NAMELEN		64
  struct fc_vport_identifiers {
  	u64 node_name;
  	u64 port_name;
  	u32 roles;
  	bool disable;
  	enum fc_port_type vport_type;	/* only FC_PORTTYPE_NPIV allowed */
  	char symbolic_name[FC_VPORT_SYMBOLIC_NAMELEN];
  };

  
  /*

   * FC Virtual Port Attributes
   *
   * This structure exists for each FC port is a virtual FC port. Virtual
   * ports share the physical link with the Physical port. Each virtual

   * ports has a unique presence on the SAN, and may be instantiated via

   * NPIV, Virtual Fabrics, or via additional ALPAs. As the vport is a

   * unique presence, each vport has it's own view of the fabric,

   * authentication privilege, and priorities.

   *
   * A virtual port may support 1 or more FC4 roles. Typically it is a
   * FCP Initiator. It could be a FCP Target, or exist sole for an IP over FC
   * roles. FC port attributes for the vport will be reported on any
   * fc_host class object allocated for an FCP Initiator.
   *
   * --
   *
   * Fixed attributes are not expected to change. The driver is
   * expected to set these values after receiving the fc_vport structure
   * via the vport_create() call from the transport.
   * The transport fully manages all get functions w/o driver interaction.
   *
   * Dynamic attributes are expected to change. The driver participates
   * in all get/set operations via functions provided by the driver.
   *
   * Private attributes are transport-managed values. They are fully
   * managed by the transport w/o driver interaction.
   */

  struct fc_vport {
  	/* Fixed Attributes */
  
  	/* Dynamic Attributes */
  
  	/* Private (Transport-managed) Attributes */
  	enum fc_vport_state vport_state;
  	enum fc_vport_state vport_last_state;
  	u64 node_name;
  	u64 port_name;
  	u32 roles;
  	u32 vport_id;		/* Admin Identifier for the vport */
  	enum fc_port_type vport_type;
  	char symbolic_name[FC_VPORT_SYMBOLIC_NAMELEN];
  
  	/* exported data */
  	void *dd_data;			/* Used for driver-specific storage */
  
  	/* internal data */
  	struct Scsi_Host *shost;	/* Physical Port Parent */
  	unsigned int channel;
  	u32 number;
  	u8 flags;
  	struct list_head peers;
  	struct device dev;

  	struct work_struct vport_delete_work;

  } __attribute__((aligned(sizeof(unsigned long))));
  
  /* bit field values for struct fc_vport "flags" field: */
  #define FC_VPORT_CREATING		0x01
  #define FC_VPORT_DELETING		0x02
  #define FC_VPORT_DELETED		0x04
  #define FC_VPORT_DEL			0x06	/* Any DELETE state */
  
  #define	dev_to_vport(d)				\
  	container_of(d, struct fc_vport, dev)

  #define transport_class_to_vport(dev)		\
  	dev_to_vport(dev->parent)

  #define vport_to_shost(v)			\
  	(v->shost)
  #define vport_to_shost_channel(v)		\
  	(v->channel)
  #define vport_to_parent(v)			\
  	(v->dev.parent)
  
  
  /* Error return codes for vport_create() callback */
  #define VPCERR_UNSUPPORTED		-ENOSYS		/* no driver/adapter
  							   support */
  #define VPCERR_BAD_WWN			-ENOTUNIQ	/* driver validation
  							   of WWNs failed */
  #define VPCERR_NO_FABRIC_SUPP		-EOPNOTSUPP	/* Fabric connection
  							   is loop or the
  							   Fabric Port does
  							   not support NPIV */
  
  /*

   * fc_rport_identifiers: This set of data contains all elements
   * to uniquely identify a remote FC port. The driver uses this data
   * to report the existence of a remote FC port in the topology. Internally,
   * the transport uses this data for attributes and to manage consistent
   * target id bindings.
   */
  struct fc_rport_identifiers {
  	u64 node_name;
  	u64 port_name;
  	u32 port_id;
  	u32 roles;
  };

  /* Macro for use in defining Remote Port attributes */
  #define FC_RPORT_ATTR(_name,_mode,_show,_store)				\

  struct device_attribute dev_attr_rport_##_name = 	\

  	__ATTR(_name,_mode,_show,_store)
  
  
  /*
   * FC Remote Port Attributes
   *
   * This structure exists for each remote FC port that a LLDD notifies
   * the subsystem of.  A remote FC port may or may not be a SCSI Target,
   * also be a SCSI initiator, IP endpoint, etc. As such, the remote
   * port is considered a separate entity, independent of "role" (such
   * as scsi target).
   *
   * --
   *
   * Attributes are based on HBAAPI V2.0 definitions. Only those
   * attributes that are determinable by the local port (aka Host)
   * are contained.
   *
   * Fixed attributes are not expected to change. The driver is
   * expected to set these values after successfully calling
   * fc_remote_port_add(). The transport fully manages all get functions
   * w/o driver interaction.
   *
   * Dynamic attributes are expected to change. The driver participates
   * in all get/set operations via functions provided by the driver.
   *
   * Private attributes are transport-managed values. They are fully
   * managed by the transport w/o driver interaction.
   */
  
  struct fc_rport {	/* aka fc_starget_attrs */
  	/* Fixed Attributes */
  	u32 maxframe_size;
  	u32 supported_classes;
  
  	/* Dynamic Attributes */
  	u32 dev_loss_tmo;	/* Remote Port loss timeout in seconds. */
  
  	/* Private (Transport-managed) Attributes */
  	u64 node_name;
  	u64 port_name;
  	u32 port_id;
  	u32 roles;
  	enum fc_port_state port_state;	/* Will only be ONLINE or UNKNOWN */
  	u32 scsi_target_id;

  	u32 fast_io_fail_tmo;

  
  	/* exported data */
  	void *dd_data;			/* Used for driver-specific storage */
  
  	/* internal data */
  	unsigned int channel;
  	u32 number;

  	u8 flags;

  	struct list_head peers;
  	struct device dev;

   	struct delayed_work dev_loss_work;

   	struct work_struct scan_work;

   	struct delayed_work fail_io_work;

   	struct work_struct stgt_delete_work;
  	struct work_struct rport_delete_work;

  	struct request_queue *rqst_q;	/* bsg support */

  } __attribute__((aligned(sizeof(unsigned long))));

  /* bit field values for struct fc_rport "flags" field: */
  #define FC_RPORT_DEVLOSS_PENDING	0x01
  #define FC_RPORT_SCAN_PENDING		0x02

  #define FC_RPORT_FAST_FAIL_TIMEDOUT	0x04

  #define FC_RPORT_DEVLOSS_CALLBK_DONE	0x08

  #define	dev_to_rport(d)				\
  	container_of(d, struct fc_rport, dev)

  #define transport_class_to_rport(dev)	\
  	dev_to_rport(dev->parent)

  #define rport_to_shost(r)			\
  	dev_to_shost(r->dev.parent)
  
  /*
   * FC SCSI Target Attributes
   *

   * The SCSI Target is considered an extension of a remote port (as

   * a remote port can be more than a SCSI Target). Within the scsi
   * subsystem, we leave the Target as a separate entity. Doing so
   * provides backward compatibility with prior FC transport api's,
   * and lets remote ports be handled entirely within the FC transport
   * and independently from the scsi subsystem. The drawback is that
   * some data will be duplicated.
   */
  
  struct fc_starget_attrs {	/* aka fc_target_attrs */
  	/* Dynamic Attributes */
  	u64 node_name;
  	u64 port_name;
  	u32 port_id;
  };
  
  #define fc_starget_node_name(x) \
  	(((struct fc_starget_attrs *)&(x)->starget_data)->node_name)
  #define fc_starget_port_name(x)	\
  	(((struct fc_starget_attrs *)&(x)->starget_data)->port_name)
  #define fc_starget_port_id(x) \
  	(((struct fc_starget_attrs *)&(x)->starget_data)->port_id)
  
  #define starget_to_rport(s)			\
  	scsi_is_fc_rport(s->dev.parent) ? dev_to_rport(s->dev.parent) : NULL
  
  
  /*
   * FC Local Port (Host) Statistics
   */
  
  /* FC Statistics - Following FC HBAAPI v2.0 guidelines */
  struct fc_host_statistics {
  	/* port statistics */
  	u64 seconds_since_last_reset;
  	u64 tx_frames;
  	u64 tx_words;
  	u64 rx_frames;
  	u64 rx_words;
  	u64 lip_count;
  	u64 nos_count;
  	u64 error_frames;
  	u64 dumped_frames;
  	u64 link_failure_count;
  	u64 loss_of_sync_count;
  	u64 loss_of_signal_count;
  	u64 prim_seq_protocol_err_count;
  	u64 invalid_tx_word_count;
  	u64 invalid_crc_count;

  	/* fc4 statistics  (only FCP supported currently) */
  	u64 fcp_input_requests;
  	u64 fcp_output_requests;
  	u64 fcp_control_requests;
  	u64 fcp_input_megabytes;
  	u64 fcp_output_megabytes;

  	u64 fcp_packet_alloc_failures;	/* fcp packet allocation failures */
  	u64 fcp_packet_aborts;		/* fcp packet aborted */
  	u64 fcp_frame_alloc_failures;	/* fcp frame allocation failures */
  
  	/* fc exches statistics */
  	u64 fc_no_free_exch;		/* no free exch memory */
  	u64 fc_no_free_exch_xid;	/* no free exch id */
  	u64 fc_xid_not_found;		/* exch not found for a response */
  	u64 fc_xid_busy;		/* exch exist for new a request */
  	u64 fc_seq_not_found;		/* seq is not found for exchange */
  	u64 fc_non_bls_resp;		/* a non BLS response frame with
  					   a sequence responder in new exch */

  };
  
  
  /*

   * FC Event Codes - Polled and Async, following FC HBAAPI v2.0 guidelines
   */
  
  /*
   * fc_host_event_code: If you alter this, you also need to alter
   * scsi_transport_fc.c (for the ascii descriptions).
   */
  enum fc_host_event_code  {
  	FCH_EVT_LIP			= 0x1,
  	FCH_EVT_LINKUP			= 0x2,
  	FCH_EVT_LINKDOWN		= 0x3,
  	FCH_EVT_LIPRESET		= 0x4,
  	FCH_EVT_RSCN			= 0x5,
  	FCH_EVT_ADAPTER_CHANGE		= 0x103,
  	FCH_EVT_PORT_UNKNOWN		= 0x200,
  	FCH_EVT_PORT_OFFLINE		= 0x201,
  	FCH_EVT_PORT_ONLINE		= 0x202,
  	FCH_EVT_PORT_FABRIC		= 0x204,
  	FCH_EVT_LINK_UNKNOWN		= 0x500,
  	FCH_EVT_VENDOR_UNIQUE		= 0xffff,
  };
  
  
  /*

   * FC Local Port (Host) Attributes
   *
   * Attributes are based on HBAAPI V2.0 definitions.
   * Note: OSDeviceName is determined by user-space library
   *
   * Fixed attributes are not expected to change. The driver is
   * expected to set these values after successfully calling scsi_add_host().
   * The transport fully manages all get functions w/o driver interaction.
   *
   * Dynamic attributes are expected to change. The driver participates
   * in all get/set operations via functions provided by the driver.
   *
   * Private attributes are transport-managed values. They are fully
   * managed by the transport w/o driver interaction.
   */
  
  #define FC_FC4_LIST_SIZE		32
  #define FC_SYMBOLIC_NAME_SIZE		256
  #define FC_VERSION_STRING_SIZE		64
  #define FC_SERIAL_NUMBER_SIZE		80
  
  struct fc_host_attrs {
  	/* Fixed Attributes */
  	u64 node_name;
  	u64 port_name;

  	u64 permanent_port_name;

  	u32 supported_classes;
  	u8  supported_fc4s[FC_FC4_LIST_SIZE];

  	u32 supported_speeds;
  	u32 maxframe_size;

  	u16 max_npiv_vports;

  	char serial_number[FC_SERIAL_NUMBER_SIZE];

  	char manufacturer[FC_SERIAL_NUMBER_SIZE];
  	char model[FC_SYMBOLIC_NAME_SIZE];
  	char model_description[FC_SYMBOLIC_NAME_SIZE];
  	char hardware_version[FC_VERSION_STRING_SIZE];
  	char driver_version[FC_VERSION_STRING_SIZE];
  	char firmware_version[FC_VERSION_STRING_SIZE];
  	char optionrom_version[FC_VERSION_STRING_SIZE];

  
  	/* Dynamic Attributes */
  	u32 port_id;
  	enum fc_port_type port_type;
  	enum fc_port_state port_state;
  	u8  active_fc4s[FC_FC4_LIST_SIZE];
  	u32 speed;
  	u64 fabric_name;

  	char symbolic_name[FC_SYMBOLIC_NAME_SIZE];
  	char system_hostname[FC_SYMBOLIC_NAME_SIZE];

  	u32 dev_loss_tmo;

  
  	/* Private (Transport-managed) Attributes */
  	enum fc_tgtid_binding_type  tgtid_bind_type;
  
  	/* internal data */
  	struct list_head rports;
  	struct list_head rport_bindings;

  	struct list_head vports;

  	u32 next_rport_number;
  	u32 next_target_id;

  	u32 next_vport_number;
  	u16 npiv_vports_inuse;

  	/* work queues for rport state manipulation */

  	char work_q_name[20];

  	struct workqueue_struct *work_q;

  	char devloss_work_q_name[20];

  	struct workqueue_struct *devloss_work_q;

  
  	/* bsg support */
  	struct request_queue *rqst_q;

  };

  #define shost_to_fc_host(x) \
  	((struct fc_host_attrs *)(x)->shost_data)

  #define fc_host_node_name(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->node_name)
  #define fc_host_port_name(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->port_name)

  #define fc_host_permanent_port_name(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->permanent_port_name)

  #define fc_host_supported_classes(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->supported_classes)
  #define fc_host_supported_fc4s(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->supported_fc4s)

  #define fc_host_supported_speeds(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->supported_speeds)
  #define fc_host_maxframe_size(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->maxframe_size)

  #define fc_host_max_npiv_vports(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->max_npiv_vports)

  #define fc_host_serial_number(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->serial_number)

  #define fc_host_manufacturer(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->manufacturer)
  #define fc_host_model(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->model)
  #define fc_host_model_description(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->model_description)
  #define fc_host_hardware_version(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->hardware_version)
  #define fc_host_driver_version(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->driver_version)
  #define fc_host_firmware_version(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->firmware_version)
  #define fc_host_optionrom_version(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->optionrom_version)

  #define fc_host_port_id(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->port_id)
  #define fc_host_port_type(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->port_type)
  #define fc_host_port_state(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->port_state)
  #define fc_host_active_fc4s(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->active_fc4s)
  #define fc_host_speed(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->speed)
  #define fc_host_fabric_name(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->fabric_name)

  #define fc_host_symbolic_name(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->symbolic_name)
  #define fc_host_system_hostname(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->system_hostname)

  #define fc_host_tgtid_bind_type(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->tgtid_bind_type)
  #define fc_host_rports(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->rports)
  #define fc_host_rport_bindings(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->rport_bindings)

  #define fc_host_vports(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->vports)

  #define fc_host_next_rport_number(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->next_rport_number)
  #define fc_host_next_target_id(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->next_target_id)

  #define fc_host_next_vport_number(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->next_vport_number)
  #define fc_host_npiv_vports_inuse(x)	\
  	(((struct fc_host_attrs *)(x)->shost_data)->npiv_vports_inuse)

  #define fc_host_work_q_name(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->work_q_name)
  #define fc_host_work_q(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->work_q)
  #define fc_host_devloss_work_q_name(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->devloss_work_q_name)
  #define fc_host_devloss_work_q(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->devloss_work_q)

  #define fc_host_dev_loss_tmo(x) \
  	(((struct fc_host_attrs *)(x)->shost_data)->dev_loss_tmo)

  struct fc_bsg_buffer {
  	unsigned int payload_len;
  	int sg_cnt;
  	struct scatterlist *sg_list;
  };
  
  /* Values for fc_bsg_job->state_flags (bitflags) */
  #define FC_RQST_STATE_INPROGRESS	0
  #define FC_RQST_STATE_DONE		1
  
  struct fc_bsg_job {
  	struct Scsi_Host *shost;
  	struct fc_rport *rport;
  	struct device *dev;
  	struct request *req;
  	spinlock_t job_lock;
  	unsigned int state_flags;
  	unsigned int ref_cnt;
  	void (*job_done)(struct fc_bsg_job *);
  
  	struct fc_bsg_request *request;
  	struct fc_bsg_reply *reply;
  	unsigned int request_len;
  	unsigned int reply_len;
  	/*
  	 * On entry : reply_len indicates the buffer size allocated for
  	 * the reply.
  	 *
  	 * Upon completion : the message handler must set reply_len
  	 *  to indicates the size of the reply to be returned to the
  	 *  caller.
  	 */
  
  	/* DMA payloads for the request/response */
  	struct fc_bsg_buffer request_payload;
  	struct fc_bsg_buffer reply_payload;
  
  	void *dd_data;			/* Used for driver-specific storage */
  };

  /* The functions by which the transport class and the driver communicate */
  struct fc_function_template {
  	void    (*get_rport_dev_loss_tmo)(struct fc_rport *);
  	void	(*set_rport_dev_loss_tmo)(struct fc_rport *, u32);
  
  	void	(*get_starget_node_name)(struct scsi_target *);
  	void	(*get_starget_port_name)(struct scsi_target *);
  	void 	(*get_starget_port_id)(struct scsi_target *);
  
  	void 	(*get_host_port_id)(struct Scsi_Host *);
  	void	(*get_host_port_type)(struct Scsi_Host *);
  	void	(*get_host_port_state)(struct Scsi_Host *);
  	void	(*get_host_active_fc4s)(struct Scsi_Host *);
  	void	(*get_host_speed)(struct Scsi_Host *);
  	void	(*get_host_fabric_name)(struct Scsi_Host *);

  	void	(*get_host_symbolic_name)(struct Scsi_Host *);

  	void	(*set_host_system_hostname)(struct Scsi_Host *);

  
  	struct fc_host_statistics * (*get_fc_host_stats)(struct Scsi_Host *);
  	void	(*reset_fc_host_stats)(struct Scsi_Host *);

  	int	(*issue_fc_host_lip)(struct Scsi_Host *);

  	void    (*dev_loss_tmo_callbk)(struct fc_rport *);
  	void	(*terminate_rport_io)(struct fc_rport *);

  	void	(*set_vport_symbolic_name)(struct fc_vport *);
  	int  	(*vport_create)(struct fc_vport *, bool);
  	int	(*vport_disable)(struct fc_vport *, bool);
  	int  	(*vport_delete)(struct fc_vport *);

  	/* target-mode drivers' functions */
  	int     (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
  	int     (* it_nexus_response)(struct Scsi_Host *, u64, int);

  	/* bsg support */
  	int	(*bsg_request)(struct fc_bsg_job *);
  	int	(*bsg_timeout)(struct fc_bsg_job *);

  	/* allocation lengths for host-specific data */
  	u32	 			dd_fcrport_size;

  	u32	 			dd_fcvport_size;

  	u32				dd_bsg_size;

  	/*

  	 * The driver sets these to tell the transport class it
  	 * wants the attributes displayed in sysfs.  If the show_ flag
  	 * is not set, the attribute will be private to the transport

  	 * class

  	 */
  
  	/* remote port fixed attributes */
  	unsigned long	show_rport_maxframe_size:1;
  	unsigned long	show_rport_supported_classes:1;
  	unsigned long   show_rport_dev_loss_tmo:1;
  
  	/*
  	 * target dynamic attributes
  	 * These should all be "1" if the driver uses the remote port
  	 * add/delete functions (so attributes reflect rport values).
  	 */
  	unsigned long	show_starget_node_name:1;
  	unsigned long	show_starget_port_name:1;
  	unsigned long	show_starget_port_id:1;
  
  	/* host fixed attributes */
  	unsigned long	show_host_node_name:1;
  	unsigned long	show_host_port_name:1;

  	unsigned long	show_host_permanent_port_name:1;

  	unsigned long	show_host_supported_classes:1;
  	unsigned long	show_host_supported_fc4s:1;

  	unsigned long	show_host_supported_speeds:1;
  	unsigned long	show_host_maxframe_size:1;
  	unsigned long	show_host_serial_number:1;

  	unsigned long	show_host_manufacturer:1;
  	unsigned long	show_host_model:1;
  	unsigned long	show_host_model_description:1;
  	unsigned long	show_host_hardware_version:1;
  	unsigned long	show_host_driver_version:1;
  	unsigned long	show_host_firmware_version:1;
  	unsigned long	show_host_optionrom_version:1;

  	/* host dynamic attributes */
  	unsigned long	show_host_port_id:1;
  	unsigned long	show_host_port_type:1;
  	unsigned long	show_host_port_state:1;
  	unsigned long	show_host_active_fc4s:1;
  	unsigned long	show_host_speed:1;
  	unsigned long	show_host_fabric_name:1;

  	unsigned long	show_host_symbolic_name:1;

  	unsigned long	show_host_system_hostname:1;

  
  	unsigned long	disable_target_scan:1;

  };

  /**
   * fc_remote_port_chkready - called to validate the remote port state
   *   prior to initiating io to the port.
   *
   * Returns a scsi result code that can be returned by the LLDD.
   *
   * @rport:	remote port to be checked
   **/
  static inline int
  fc_remote_port_chkready(struct fc_rport *rport)
  {
  	int result;
  
  	switch (rport->port_state) {
  	case FC_PORTSTATE_ONLINE:

  		if (rport->roles & FC_PORT_ROLE_FCP_TARGET)

  			result = 0;
  		else if (rport->flags & FC_RPORT_DEVLOSS_PENDING)

  			result = DID_IMM_RETRY << 16;

  		else
  			result = DID_NO_CONNECT << 16;

  		break;
  	case FC_PORTSTATE_BLOCKED:

  		if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)

  			result = DID_TRANSPORT_FAILFAST << 16;

  		else

  			result = DID_IMM_RETRY << 16;

  		break;
  	default:
  		result = DID_NO_CONNECT << 16;
  		break;
  	}
  	return result;
  }

  static inline u64 wwn_to_u64(u8 *wwn)
  {

  	return get_unaligned_be64(wwn);

  }
  
  static inline void u64_to_wwn(u64 inm, u8 *wwn)
  {

  	put_unaligned_be64(inm, wwn);

  }

  /**
   * fc_vport_set_state() - called to set a vport's state. Saves the old state,
   *   excepting the transitory states of initializing and sending the ELS
   *   traffic to instantiate the vport on the link.
   *
   * Assumes the driver has surrounded this with the proper locking to ensure
   * a coherent state change.
   *
   * @vport:	virtual port whose state is changing
   * @new_state:  new state
   **/
  static inline void
  fc_vport_set_state(struct fc_vport *vport, enum fc_vport_state new_state)
  {
  	if ((new_state != FC_VPORT_UNKNOWN) &&
  	    (new_state != FC_VPORT_INITIALIZING))
  		vport->vport_last_state = vport->vport_state;
  	vport->vport_state = new_state;
  }

  struct scsi_transport_template *fc_attach_transport(
  			struct fc_function_template *);
  void fc_release_transport(struct scsi_transport_template *);
  void fc_remove_host(struct Scsi_Host *);
  struct fc_rport *fc_remote_port_add(struct Scsi_Host *shost,
  			int channel, struct fc_rport_identifiers  *ids);
  void fc_remote_port_delete(struct fc_rport  *rport);
  void fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles);

  int scsi_is_fc_rport(const struct device *);

  u32 fc_get_event_number(void);
  void fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
  		enum fc_host_event_code event_code, u32 event_data);
  void fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,

  		u32 data_len, char * data_buf, u64 vendor_id);

  	/* Note: when specifying vendor_id to fc_host_post_vendor_event()
  	 *   be sure to read the Vendor Type and ID formatting requirements
  	 *   specified in scsi_netlink.h
  	 */

  struct fc_vport *fc_vport_create(struct Scsi_Host *shost, int channel,
  		struct fc_vport_identifiers *);

  int fc_vport_terminate(struct fc_vport *vport);

  int fc_block_scsi_eh(struct scsi_cmnd *cmnd);

  
  #endif /* SCSI_TRANSPORT_FC_H */