drivers/s390/scsi/zfcp_def.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * zfcp device driver
  *
  * Global definitions for the zfcp device driver.
  *
  * Copyright IBM Corp. 2002, 2020
  */

 #ifndef ZFCP_DEF_H
 #define ZFCP_DEF_H

 /*************************** INCLUDES *****************************************/

 #include <linux/init.h>
 #include <linux/moduleparam.h>
 #include <linux/major.h>
 #include <linux/blkdev.h>
 #include <linux/delay.h>
 #include <linux/timer.h>
 #include <linux/slab.h>
 #include <linux/mempool.h>
 #include <linux/syscalls.h>
 #include <linux/scatterlist.h>
 #include <linux/ioctl.h>
 #include <scsi/fc/fc_fs.h>
 #include <scsi/fc/fc_gs.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_fc.h>
 #include <scsi/scsi_bsg_fc.h>
 #include <asm/ccwdev.h>
 #include <asm/debug.h>
 #include <asm/ebcdic.h>
 #include <asm/sysinfo.h>
 #include "zfcp_fsf.h"
 #include "zfcp_fc.h"
 #include "zfcp_qdio.h"

 /********************* FSF SPECIFIC DEFINES *********************************/

 /* ATTENTION: value must not be used by hardware */
 #define FSF_QTCB_UNSOLICITED_STATUS		0x6305

 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/

 /*
  * Note, the leftmost 12 status bits (3 nibbles) are common among adapter, port
  * and unit. This is a mask for bitwise 'and' with status values.
  */
 #define ZFCP_COMMON_FLAGS			0xfff00000

 /* common status bits */
 #define ZFCP_STATUS_COMMON_RUNNING		0x40000000
 #define ZFCP_STATUS_COMMON_ERP_FAILED		0x20000000
 #define ZFCP_STATUS_COMMON_UNBLOCKED		0x10000000
 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 #define ZFCP_STATUS_COMMON_ERP_INUSE		0x01000000
 #define ZFCP_STATUS_COMMON_ACCESS_DENIED	0x00800000
 #define ZFCP_STATUS_COMMON_ACCESS_BOXED		0x00400000
 #define ZFCP_STATUS_COMMON_NOESC		0x00200000

 /* adapter status */
 #define ZFCP_STATUS_ADAPTER_MB_ACT		0x00000001
 #define ZFCP_STATUS_ADAPTER_QDIOUP		0x00000002
 #define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED	0x00000004
 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK		0x00000008
 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT	0x00000010
 #define ZFCP_STATUS_ADAPTER_ERP_PENDING		0x00000100
 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED	0x00000200
 #define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED	0x00000400

 /* remote port status */
 #define ZFCP_STATUS_PORT_PHYS_OPEN		0x00000001
 #define ZFCP_STATUS_PORT_LINK_TEST		0x00000002

 /* FSF request status (this does not have a common part) */
 #define ZFCP_STATUS_FSFREQ_ERROR		0x00000008
 #define ZFCP_STATUS_FSFREQ_CLEANUP		0x00000010
 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED	0x00000040
 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 #define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE	0x00020000

 /************************* STRUCTURE DEFINITIONS *****************************/

 /**
  * enum zfcp_erp_act_type - Type of ERP action object.
  * @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
  * @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
  * @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
  * @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
  *
  * Values must fit into u8 because of code dependencies:
  * zfcp_dbf_rec_trig(), &zfcp_dbf_rec_trigger.want, &zfcp_dbf_rec_trigger.need;
  * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), &zfcp_dbf_rec_running.rec_action.
  */
 enum zfcp_erp_act_type {
 	ZFCP_ERP_ACTION_REOPEN_LUN	   = 1,
 	ZFCP_ERP_ACTION_REOPEN_PORT	   = 2,
 	ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
 	ZFCP_ERP_ACTION_REOPEN_ADAPTER	   = 4,
 };

 /*
  * Values must fit into u16 because of code dependencies:
  * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), zfcp_dbf_rec_run_wka(),
  * &zfcp_dbf_rec_running.rec_step.
  */
 enum zfcp_erp_steps {
 	ZFCP_ERP_STEP_UNINITIALIZED	= 0x0000,
 	ZFCP_ERP_STEP_PHYS_PORT_CLOSING	= 0x0010,
 	ZFCP_ERP_STEP_PORT_CLOSING	= 0x0100,
 	ZFCP_ERP_STEP_PORT_OPENING	= 0x0800,
 	ZFCP_ERP_STEP_LUN_CLOSING	= 0x1000,
 	ZFCP_ERP_STEP_LUN_OPENING	= 0x2000,
 };

 struct zfcp_erp_action {
 	struct list_head list;
 	enum zfcp_erp_act_type type;  /* requested action code */
 	struct zfcp_adapter *adapter; /* device which should be recovered */
 	struct zfcp_port *port;
 	struct scsi_device *sdev;
 	u32		status;	      /* recovery status */
 	enum zfcp_erp_steps	step;	/* active step of this erp action */
 	unsigned long		fsf_req_id;
 	struct timer_list timer;
 };

 /* holds various memory pools of an adapter */
 struct zfcp_adapter_mempool {
 	mempool_t *erp_req;
 	mempool_t *gid_pn_req;
 	mempool_t *scsi_req;
 	mempool_t *scsi_abort;
 	mempool_t *status_read_req;
 	mempool_t *sr_data;
 	mempool_t *gid_pn;
 	mempool_t *qtcb_pool;
 };

 struct zfcp_adapter {
 	struct kref		ref;
 	u64			peer_wwnn;	   /* P2P peer WWNN */
 	u64			peer_wwpn;	   /* P2P peer WWPN */
 	u32			peer_d_id;	   /* P2P peer D_ID */
 	struct ccw_device       *ccw_device;	   /* S/390 ccw device */
 	struct zfcp_qdio	*qdio;
 	u32			hydra_version;	   /* Hydra version */
 	u32			fsf_lic_version;
 	u32			adapter_features;  /* FCP channel features */
 	u32			connection_features; /* host connection features */
         u32			hardware_version;  /* of FCP channel */
 	u32			fc_security_algorithms; /* of FCP channel */
 	u32			fc_security_algorithms_old; /* of FCP channel */
 	u16			timer_ticks;       /* time int for a tick */
 	struct Scsi_Host	*scsi_host;	   /* Pointer to mid-layer */
 	struct list_head	port_list;	   /* remote port list */
 	rwlock_t		port_list_lock;    /* port list lock */
 	unsigned long		req_no;		   /* unique FSF req number */
 	struct zfcp_reqlist	*req_list;
 	u32			fsf_req_seq_no;	   /* FSF cmnd seq number */
 	rwlock_t		abort_lock;        /* Protects against SCSI
 						      stack abort/command
 						      completion races */
 	atomic_t		stat_miss;	   /* # missing status reads*/
 	unsigned int		stat_read_buf_num;
 	struct work_struct	stat_work;
 	atomic_t		status;	           /* status of this adapter */
 	struct list_head	erp_ready_head;	   /* error recovery for this
 						      adapter/devices */
 	wait_queue_head_t	erp_ready_wq;
 	struct list_head	erp_running_head;
 	rwlock_t		erp_lock;
 	wait_queue_head_t	erp_done_wqh;
 	struct zfcp_erp_action	erp_action;	   /* pending error recovery */
         atomic_t                erp_counter;
 	u32			erp_total_count;   /* total nr of enqueued erp
 						      actions */
 	u32			erp_low_mem_count; /* nr of erp actions waiting
 						      for memory */
 	struct task_struct	*erp_thread;
 	struct zfcp_fc_wka_ports *gs;		   /* generic services */
 	struct zfcp_dbf		*dbf;		   /* debug traces */
 	struct zfcp_adapter_mempool	pool;      /* Adapter memory pools */
 	struct fc_host_statistics *fc_stats;
 	struct fsf_qtcb_bottom_port *stats_reset_data;
 	unsigned long		stats_reset;
 	struct delayed_work	scan_work;
 	struct work_struct	ns_up_work;
 	struct service_level	service_level;
 	struct workqueue_struct	*work_queue;
 	struct device_dma_parameters dma_parms;
 	struct zfcp_fc_events events;
 	unsigned long		next_port_scan;
 	struct zfcp_diag_adapter	*diagnostics;
 	struct work_struct	version_change_lost_work;
 };

 struct zfcp_port {
 	struct device          dev;
 	struct fc_rport        *rport;         /* rport of fc transport class */
 	struct list_head       list;	       /* list of remote ports */
 	struct zfcp_adapter    *adapter;       /* adapter used to access port */
 	struct list_head	unit_list;	/* head of logical unit list */
 	rwlock_t		unit_list_lock; /* unit list lock */
 	atomic_t		units;	       /* zfcp_unit count */
 	atomic_t	       status;	       /* status of this remote port */
 	u64		       wwnn;	       /* WWNN if known */
 	u64		       wwpn;	       /* WWPN */
 	u32		       d_id;	       /* D_ID */
 	u32		       handle;	       /* handle assigned by FSF */
 	struct zfcp_erp_action erp_action;     /* pending error recovery */
         atomic_t               erp_counter;
 	u32                    maxframe_size;
 	u32                    supported_classes;
 	u32                    connection_info;
 	u32                    connection_info_old;
 	struct work_struct     gid_pn_work;
 	struct work_struct     test_link_work;
 	struct work_struct     rport_work;
 	enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 	unsigned int		starget_id;
 };

 struct zfcp_latency_record {
 	u32 min;
 	u32 max;
 	u64 sum;
 };

 struct zfcp_latency_cont {
 	struct zfcp_latency_record channel;
 	struct zfcp_latency_record fabric;
 	u64 counter;
 };

 struct zfcp_latencies {
 	struct zfcp_latency_cont read;
 	struct zfcp_latency_cont write;
 	struct zfcp_latency_cont cmd;
 	spinlock_t lock;
 };

 /**
  * struct zfcp_unit - LUN configured via zfcp sysfs
  * @dev: struct device for sysfs representation and reference counting
  * @list: entry in LUN/unit list per zfcp_port
  * @port: reference to zfcp_port where this LUN is configured
  * @fcp_lun: 64 bit LUN value
  * @scsi_work: for running scsi_scan_target
  *
  * This is the representation of a LUN that has been configured for
  * usage. The main data here is the 64 bit LUN value, data for
  * running I/O and recovery is in struct zfcp_scsi_dev.
  */
 struct zfcp_unit {
 	struct device		dev;
 	struct list_head	list;
 	struct zfcp_port	*port;
 	u64			fcp_lun;
 	struct work_struct	scsi_work;
 };

 /**
  * struct zfcp_scsi_dev - zfcp data per SCSI device
  * @status: zfcp internal status flags
  * @lun_handle: handle from "open lun" for issuing FSF requests
  * @erp_action: zfcp erp data for opening and recovering this LUN
  * @erp_counter: zfcp erp counter for this LUN
  * @latencies: FSF channel and fabric latencies
  * @port: zfcp_port where this LUN belongs to
  */
 struct zfcp_scsi_dev {
 	atomic_t		status;
 	u32			lun_handle;
 	struct zfcp_erp_action	erp_action;
 	atomic_t		erp_counter;
 	struct zfcp_latencies	latencies;
 	struct zfcp_port	*port;
 };

 /**
  * sdev_to_zfcp - Access zfcp LUN data for SCSI device
  * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
  */
 static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
 {
 	return scsi_transport_device_data(sdev);
 }

 /**
  * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
  * @sdev: SCSI device where to get the LUN from
  */
 static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
 {
 	u64 fcp_lun;

 	int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
 	return fcp_lun;
 }

 /**
  * struct zfcp_fsf_req - basic FSF request structure
  * @list: list of FSF requests
  * @req_id: unique request ID
  * @adapter: adapter this request belongs to
  * @qdio_req: qdio queue related values
  * @completion: used to signal the completion of the request
  * @status: status of the request
  * @qtcb: associated QTCB
  * @data: private data
  * @timer: timer data of this request
  * @erp_action: reference to erp action if request issued on behalf of ERP
  * @pool: reference to memory pool if used for this request
  * @issued: time when request was send (STCK)
  * @handler: handler which should be called to process response
  */
 struct zfcp_fsf_req {
 	struct list_head	list;
 	unsigned long		req_id;
 	struct zfcp_adapter	*adapter;
 	struct zfcp_qdio_req	qdio_req;
 	struct completion	completion;
 	u32			status;
 	struct fsf_qtcb		*qtcb;
 	void			*data;
 	struct timer_list	timer;
 	struct zfcp_erp_action	*erp_action;
 	mempool_t		*pool;
 	unsigned long long	issued;
 	void			(*handler)(struct zfcp_fsf_req *);
 };

 static inline
 int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
 {
 	return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
 }

 static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
 {
 	return req->qtcb == NULL;
 }

 #endif /* ZFCP_DEF_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* zfcp device driver
	*
	* Global definitions for the zfcp device driver.
	*
	* Copyright IBM Corp. 2002, 2020
	*/

	#ifndef ZFCP_DEF_H
	#define ZFCP_DEF_H

	/************************* INCLUDES ***************************************/

	#include <linux/init.h>
	#include <linux/moduleparam.h>
	#include <linux/major.h>
	#include <linux/blkdev.h>
	#include <linux/delay.h>
	#include <linux/timer.h>
	#include <linux/slab.h>
	#include <linux/mempool.h>
	#include <linux/syscalls.h>
	#include <linux/scatterlist.h>
	#include <linux/ioctl.h>
	#include <scsi/fc/fc_fs.h>
	#include <scsi/fc/fc_gs.h>
	#include <scsi/scsi.h>
	#include <scsi/scsi_tcq.h>
	#include <scsi/scsi_cmnd.h>
	#include <scsi/scsi_device.h>
	#include <scsi/scsi_host.h>
	#include <scsi/scsi_transport.h>
	#include <scsi/scsi_transport_fc.h>
	#include <scsi/scsi_bsg_fc.h>
	#include <asm/ccwdev.h>
	#include <asm/debug.h>
	#include <asm/ebcdic.h>
	#include <asm/sysinfo.h>
	#include "zfcp_fsf.h"
	#include "zfcp_fc.h"
	#include "zfcp_qdio.h"

	/******************* FSF SPECIFIC DEFINES *******************************/

	/* ATTENTION: value must not be used by hardware */
	#define FSF_QTCB_UNSOLICITED_STATUS 0x6305

	/************* ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ****************/

	/*
	* Note, the leftmost 12 status bits (3 nibbles) are common among adapter, port
	* and unit. This is a mask for bitwise 'and' with status values.
	*/
	#define ZFCP_COMMON_FLAGS 0xfff00000

	/* common status bits */
	#define ZFCP_STATUS_COMMON_RUNNING 0x40000000
	#define ZFCP_STATUS_COMMON_ERP_FAILED 0x20000000
	#define ZFCP_STATUS_COMMON_UNBLOCKED 0x10000000
	#define ZFCP_STATUS_COMMON_OPEN 0x04000000
	#define ZFCP_STATUS_COMMON_ERP_INUSE 0x01000000
	#define ZFCP_STATUS_COMMON_ACCESS_DENIED 0x00800000
	#define ZFCP_STATUS_COMMON_ACCESS_BOXED 0x00400000
	#define ZFCP_STATUS_COMMON_NOESC 0x00200000

	/* adapter status */
	#define ZFCP_STATUS_ADAPTER_MB_ACT 0x00000001
	#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
	#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED 0x00000004
	#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
	#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
	#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
	#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
	#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED 0x00000400

	/* remote port status */
	#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001
	#define ZFCP_STATUS_PORT_LINK_TEST 0x00000002

	/* FSF request status (this does not have a common part) */
	#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008
	#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010
	#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040
	#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
	#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
	#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
	#define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE 0x00020000

	/*********************** STRUCTURE DEFINITIONS ***************************/

	/**
	* enum zfcp_erp_act_type - Type of ERP action object.
	* @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
	* @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
	* @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
	* @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
	*
	* Values must fit into u8 because of code dependencies:
	* zfcp_dbf_rec_trig(), &zfcp_dbf_rec_trigger.want, &zfcp_dbf_rec_trigger.need;
	* zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), &zfcp_dbf_rec_running.rec_action.
	*/
	enum zfcp_erp_act_type {
	ZFCP_ERP_ACTION_REOPEN_LUN = 1,
	ZFCP_ERP_ACTION_REOPEN_PORT = 2,
	ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
	ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
	};

	/*
	* Values must fit into u16 because of code dependencies:
	* zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), zfcp_dbf_rec_run_wka(),
	* &zfcp_dbf_rec_running.rec_step.
	*/
	enum zfcp_erp_steps {
	ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
	ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
	ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
	ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
	ZFCP_ERP_STEP_LUN_CLOSING = 0x1000,
	ZFCP_ERP_STEP_LUN_OPENING = 0x2000,
	};

	struct zfcp_erp_action {
	struct list_head list;
	enum zfcp_erp_act_type type; /* requested action code */
	struct zfcp_adapter adapter; / device which should be recovered */
	struct zfcp_port *port;
	struct scsi_device *sdev;
	u32 status; /* recovery status */
	enum zfcp_erp_steps step; /* active step of this erp action */
	unsigned long fsf_req_id;
	struct timer_list timer;
	};

	/* holds various memory pools of an adapter */
	struct zfcp_adapter_mempool {
	mempool_t *erp_req;
	mempool_t *gid_pn_req;
	mempool_t *scsi_req;
	mempool_t *scsi_abort;
	mempool_t *status_read_req;
	mempool_t *sr_data;
	mempool_t *gid_pn;
	mempool_t *qtcb_pool;
	};

	struct zfcp_adapter {
	struct kref ref;
	u64 peer_wwnn; /* P2P peer WWNN */
	u64 peer_wwpn; /* P2P peer WWPN */
	u32 peer_d_id; /* P2P peer D_ID */
	struct ccw_device ccw_device; / S/390 ccw device */
	struct zfcp_qdio *qdio;
	u32 hydra_version; /* Hydra version */
	u32 fsf_lic_version;
	u32 adapter_features; /* FCP channel features */
	u32 connection_features; /* host connection features */
	u32 hardware_version; /* of FCP channel */
	u32 fc_security_algorithms; /* of FCP channel */
	u32 fc_security_algorithms_old; /* of FCP channel */
	u16 timer_ticks; /* time int for a tick */
	struct Scsi_Host scsi_host; / Pointer to mid-layer */
	struct list_head port_list; /* remote port list */
	rwlock_t port_list_lock; /* port list lock */
	unsigned long req_no; /* unique FSF req number */
	struct zfcp_reqlist *req_list;
	u32 fsf_req_seq_no; /* FSF cmnd seq number */
	rwlock_t abort_lock; /* Protects against SCSI
	stack abort/command
	completion races */
	atomic_t stat_miss; /* # missing status reads*/
	unsigned int stat_read_buf_num;
	struct work_struct stat_work;
	atomic_t status; /* status of this adapter */
	struct list_head erp_ready_head; /* error recovery for this
	adapter/devices */
	wait_queue_head_t erp_ready_wq;
	struct list_head erp_running_head;
	rwlock_t erp_lock;
	wait_queue_head_t erp_done_wqh;
	struct zfcp_erp_action erp_action; /* pending error recovery */
	atomic_t erp_counter;
	u32 erp_total_count; /* total nr of enqueued erp
	actions */
	u32 erp_low_mem_count; /* nr of erp actions waiting
	for memory */
	struct task_struct *erp_thread;
	struct zfcp_fc_wka_ports gs; / generic services */
	struct zfcp_dbf dbf; / debug traces */
	struct zfcp_adapter_mempool pool; /* Adapter memory pools */
	struct fc_host_statistics *fc_stats;
	struct fsf_qtcb_bottom_port *stats_reset_data;
	unsigned long stats_reset;
	struct delayed_work scan_work;
	struct work_struct ns_up_work;
	struct service_level service_level;
	struct workqueue_struct *work_queue;
	struct device_dma_parameters dma_parms;
	struct zfcp_fc_events events;
	unsigned long next_port_scan;
	struct zfcp_diag_adapter *diagnostics;
	struct work_struct version_change_lost_work;
	};

	struct zfcp_port {
	struct device dev;
	struct fc_rport rport; / rport of fc transport class */
	struct list_head list; /* list of remote ports */
	struct zfcp_adapter adapter; / adapter used to access port */
	struct list_head unit_list; /* head of logical unit list */
	rwlock_t unit_list_lock; /* unit list lock */
	atomic_t units; /* zfcp_unit count */
	atomic_t status; /* status of this remote port */
	u64 wwnn; /* WWNN if known */
	u64 wwpn; /* WWPN */
	u32 d_id; /* D_ID */
	u32 handle; /* handle assigned by FSF */
	struct zfcp_erp_action erp_action; /* pending error recovery */
	atomic_t erp_counter;
	u32 maxframe_size;
	u32 supported_classes;
	u32 connection_info;
	u32 connection_info_old;
	struct work_struct gid_pn_work;
	struct work_struct test_link_work;
	struct work_struct rport_work;
	enum { RPORT_NONE, RPORT_ADD, RPORT_DEL } rport_task;
	unsigned int starget_id;
	};

	struct zfcp_latency_record {
	u32 min;
	u32 max;
	u64 sum;
	};

	struct zfcp_latency_cont {
	struct zfcp_latency_record channel;
	struct zfcp_latency_record fabric;
	u64 counter;
	};

	struct zfcp_latencies {
	struct zfcp_latency_cont read;
	struct zfcp_latency_cont write;
	struct zfcp_latency_cont cmd;
	spinlock_t lock;
	};

	/**
	* struct zfcp_unit - LUN configured via zfcp sysfs
	* @dev: struct device for sysfs representation and reference counting
	* @list: entry in LUN/unit list per zfcp_port
	* @port: reference to zfcp_port where this LUN is configured
	* @fcp_lun: 64 bit LUN value
	* @scsi_work: for running scsi_scan_target
	*
	* This is the representation of a LUN that has been configured for
	* usage. The main data here is the 64 bit LUN value, data for
	* running I/O and recovery is in struct zfcp_scsi_dev.
	*/
	struct zfcp_unit {
	struct device dev;
	struct list_head list;
	struct zfcp_port *port;
	u64 fcp_lun;
	struct work_struct scsi_work;
	};

	/**
	* struct zfcp_scsi_dev - zfcp data per SCSI device
	* @status: zfcp internal status flags
	* @lun_handle: handle from "open lun" for issuing FSF requests
	* @erp_action: zfcp erp data for opening and recovering this LUN
	* @erp_counter: zfcp erp counter for this LUN
	* @latencies: FSF channel and fabric latencies
	* @port: zfcp_port where this LUN belongs to
	*/
	struct zfcp_scsi_dev {
	atomic_t status;
	u32 lun_handle;
	struct zfcp_erp_action erp_action;
	atomic_t erp_counter;
	struct zfcp_latencies latencies;
	struct zfcp_port *port;
	};

	/**
	* sdev_to_zfcp - Access zfcp LUN data for SCSI device
	* @sdev: scsi_device where to get the zfcp_scsi_dev pointer
	*/
	static inline struct zfcp_scsi_dev sdev_to_zfcp(struct scsi_device sdev)
	{
	return scsi_transport_device_data(sdev);
	}

	/**
	* zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
	* @sdev: SCSI device where to get the LUN from
	*/
	static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
	{
	u64 fcp_lun;

	int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
	return fcp_lun;
	}

	/**
	* struct zfcp_fsf_req - basic FSF request structure
	* @list: list of FSF requests
	* @req_id: unique request ID
	* @adapter: adapter this request belongs to
	* @qdio_req: qdio queue related values
	* @completion: used to signal the completion of the request
	* @status: status of the request
	* @qtcb: associated QTCB
	* @data: private data
	* @timer: timer data of this request
	* @erp_action: reference to erp action if request issued on behalf of ERP
	* @pool: reference to memory pool if used for this request
	* @issued: time when request was send (STCK)
	* @handler: handler which should be called to process response
	*/
	struct zfcp_fsf_req {
	struct list_head list;
	unsigned long req_id;
	struct zfcp_adapter *adapter;
	struct zfcp_qdio_req qdio_req;
	struct completion completion;
	u32 status;
	struct fsf_qtcb *qtcb;
	void *data;
	struct timer_list timer;
	struct zfcp_erp_action *erp_action;
	mempool_t *pool;
	unsigned long long issued;
	void (handler)(struct zfcp_fsf_req );
	};

	static inline
	int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
	{
	return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
	}

	static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
	{
	return req->qtcb == NULL;
	}

	#endif /* ZFCP_DEF_H */