writeback: safer lock nesting

[linux/fpc-iii.git] / include / scsi / scsi_transport_fc.h

/*
 *  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 <linux/bsg-lib.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_netlink.h>
#include <scsi/scsi_host.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
#define FC_PORT_ROLE_FCP_DUMMY_INITIATOR        0x08

/* 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)

/* 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 *);

        /* bsg support */
        int     (*bsg_request)(struct bsg_job *);
        int     (*bsg_timeout)(struct 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_rport(struct fc_rport *rport);
int fc_block_scsi_eh(struct scsi_cmnd *cmnd);
enum blk_eh_timer_return fc_eh_timed_out(struct scsi_cmnd *scmd);

static inline struct Scsi_Host *fc_bsg_to_shost(struct bsg_job *job)
{
        if (scsi_is_host_device(job->dev))
                return dev_to_shost(job->dev);
        return rport_to_shost(dev_to_rport(job->dev));
}

static inline struct fc_rport *fc_bsg_to_rport(struct bsg_job *job)
{
        if (scsi_is_fc_rport(job->dev))
                return dev_to_rport(job->dev);
        return NULL;
}

#endif /* SCSI_TRANSPORT_FC_H */