zfcp_def.h

linux-2.6.15.6

	struct ct_hdr header;
	wwn_t wwpn;
} __attribute__ ((packed));

/* FS_ACC IU and data unit for GID_PN nameserver request */
struct ct_iu_gid_pn_resp {
	struct ct_hdr header;
	u32 d_id;
} __attribute__ ((packed));

typedef void (*zfcp_send_ct_handler_t)(unsigned long);

/**
 * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 * @port: port where the request is sent to
 * @req: scatter-gather list for request
 * @resp: scatter-gather list for response
 * @req_count: number of elements in request scatter-gather list
 * @resp_count: number of elements in response scatter-gather list
 * @handler: handler function (called for response to the request)
 * @handler_data: data passed to handler function
 * @pool: pointer to memory pool for ct request structure
 * @timeout: FSF timeout for this request
 * @timer: timer (e.g. for request initiated by erp)
 * @completion: completion for synchronization purposes
 * @status: used to pass error status to calling function
 */
struct zfcp_send_ct {
	struct zfcp_port *port;
	struct scatterlist *req;
	struct scatterlist *resp;
	unsigned int req_count;
	unsigned int resp_count;
	zfcp_send_ct_handler_t handler;
	unsigned long handler_data;
	mempool_t *pool;
	int timeout;
	struct timer_list *timer;
	struct completion *completion;
	int status;
};

/* used for name server requests in error recovery */
struct zfcp_gid_pn_data {
	struct zfcp_send_ct ct;
	struct scatterlist req;
	struct scatterlist resp;
	struct ct_iu_gid_pn_req ct_iu_req;
	struct ct_iu_gid_pn_resp ct_iu_resp;
        struct zfcp_port *port;
};

typedef void (*zfcp_send_els_handler_t)(unsigned long);

/**
 * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 * @adapter: adapter where request is sent from
 * @port: port where ELS is destinated (port reference count has to be increased)
 * @d_id: destiniation id of port where request is sent to
 * @req: scatter-gather list for request
 * @resp: scatter-gather list for response
 * @req_count: number of elements in request scatter-gather list
 * @resp_count: number of elements in response scatter-gather list
 * @handler: handler function (called for response to the request)
 * @handler_data: data passed to handler function
 * @timer: timer (e.g. for request initiated by erp)
 * @completion: completion for synchronization purposes
 * @ls_code: hex code of ELS command
 * @status: used to pass error status to calling function
 */
struct zfcp_send_els {
	struct zfcp_adapter *adapter;
	struct zfcp_port *port;
	u32 d_id;
	struct scatterlist *req;
	struct scatterlist *resp;
	unsigned int req_count;
	unsigned int resp_count;
	zfcp_send_els_handler_t handler;
	unsigned long handler_data;
	struct timer_list *timer;
	struct completion *completion;
	int ls_code;
	int status;
};

struct zfcp_qdio_queue {
	struct qdio_buffer *buffer[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
	u8		   free_index;	      /* index of next free bfr
						 in queue (free_count>0) */
	atomic_t           free_count;	      /* number of free buffers
						 in queue */
	rwlock_t	   queue_lock;	      /* lock for operations on queue */
        int                distance_from_int; /* SBALs used since PCI indication
						 was last set */
};

struct zfcp_erp_action {
	struct list_head list;
	int action;	              /* requested action code */
	struct zfcp_adapter *adapter; /* device which should be recovered */
	struct zfcp_port *port;
	struct zfcp_unit *unit;
	volatile u32 status;	      /* recovery status */
	u32 step;	              /* active step of this erp action */
	struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
					 for this action */
	struct timer_list timer;
};


struct zfcp_adapter {
	struct list_head	list;              /* list of adapters */
	atomic_t                refcount;          /* reference count */
	wait_queue_head_t	remove_wq;         /* can be used to wait for
						      refcount drop to zero */
	wwn_t			peer_wwnn;	   /* P2P peer WWNN */
	wwn_t			peer_wwpn;	   /* P2P peer WWPN */
	u32			peer_d_id;	   /* P2P peer D_ID */
	wwn_t			physical_wwpn;     /* WWPN of physical port */
	u32			physical_s_id;     /* local FC port ID */
	struct ccw_device       *ccw_device;	   /* S/390 ccw device */
	u8			fc_service_class;
	u32			fc_topology;	   /* FC topology */
	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 */
	struct Scsi_Host	*scsi_host;	   /* Pointer to mid-layer */
	unsigned short          scsi_host_no;      /* Assigned host number */
	unsigned char		name[9];
	struct list_head	port_list_head;	   /* remote port list */
	struct list_head        port_remove_lh;    /* head of ports to be
						      removed */
	u32			ports;	           /* number of remote ports */
        struct timer_list       scsi_er_timer;     /* SCSI err recovery watch */
	struct list_head	fsf_req_list_head; /* head of FSF req list */
	spinlock_t		fsf_req_list_lock; /* lock for ops on list of
						      FSF requests */
        atomic_t       		fsf_reqs_active;   /* # active FSF reqs */
	struct zfcp_qdio_queue	request_queue;	   /* request queue */
	u32			fsf_req_seq_no;	   /* FSF cmnd seq number */
	wait_queue_head_t	request_wq;	   /* can be used to wait for
						      more avaliable SBALs */
	struct zfcp_qdio_queue	response_queue;	   /* response queue */
	rwlock_t		abort_lock;        /* Protects against SCSI
						      stack abort/command
						      completion races */
	u16			status_read_failed; /* # failed status reads */
	atomic_t		status;	           /* status of this adapter */
	struct list_head	erp_ready_head;	   /* error recovery for this
						      adapter/devices */
	struct list_head	erp_running_head;
	rwlock_t		erp_lock;
	struct semaphore	erp_ready_sem;
	wait_queue_head_t	erp_thread_wqh;
	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 zfcp_port	*nameserver_port;  /* adapter's nameserver */
	debug_info_t		*erp_dbf;
	debug_info_t		*hba_dbf;
	debug_info_t		*san_dbf;          /* debug feature areas */
	debug_info_t		*scsi_dbf;
	spinlock_t		erp_dbf_lock;
	spinlock_t		hba_dbf_lock;
	spinlock_t		san_dbf_lock;
	spinlock_t		scsi_dbf_lock;
	struct zfcp_erp_dbf_record	erp_dbf_buf;
	struct zfcp_hba_dbf_record	hba_dbf_buf;
	struct zfcp_san_dbf_record	san_dbf_buf;
	struct zfcp_scsi_dbf_record	scsi_dbf_buf;
	struct zfcp_adapter_mempool	pool;      /* Adapter memory pools */
	struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
	struct device           generic_services;  /* directory for WKA ports */
};

/*
 * the struct device sysfs_device must be at the beginning of this structure.
 * pointer to struct device is used to free port structure in release function
 * of the device. don't change!
 */
struct zfcp_port {
	struct device          sysfs_device;   /* sysfs device */
	struct fc_rport        *rport;         /* rport of fc transport class */
	struct list_head       list;	       /* list of remote ports */
	atomic_t               refcount;       /* reference count */
	wait_queue_head_t      remove_wq;      /* can be used to wait for
						  refcount drop to zero */
	struct zfcp_adapter    *adapter;       /* adapter used to access port */
	struct list_head       unit_list_head; /* head of logical unit list */
	struct list_head       unit_remove_lh; /* head of luns to be removed
						  list */
	u32		       units;	       /* # of logical units in list */
	atomic_t	       status;	       /* status of this remote port */
	wwn_t		       wwnn;	       /* WWNN if known */
	wwn_t		       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;
};

/* the struct device sysfs_device must be at the beginning of this structure.
 * pointer to struct device is used to free unit structure in release function
 * of the device. don't change!
 */
struct zfcp_unit {
	struct device          sysfs_device;   /* sysfs device */
	struct list_head       list;	       /* list of logical units */
	atomic_t               refcount;       /* reference count */
	wait_queue_head_t      remove_wq;      /* can be used to wait for
						  refcount drop to zero */
	struct zfcp_port       *port;	       /* remote port of unit */
	atomic_t	       status;	       /* status of this logical unit */
	scsi_lun_t	       scsi_lun;       /* own SCSI LUN */
	fcp_lun_t	       fcp_lun;	       /* own FCP_LUN */
	u32		       handle;	       /* handle assigned by FSF */
        struct scsi_device     *device;        /* scsi device struct pointer */
	struct zfcp_erp_action erp_action;     /* pending error recovery */
        atomic_t               erp_counter;
};

/* FSF request */
struct zfcp_fsf_req {
	struct list_head       list;	       /* list of FSF requests */
	struct zfcp_adapter    *adapter;       /* adapter request belongs to */
	u8		       sbal_number;    /* nr of SBALs free for use */
	u8		       sbal_first;     /* first SBAL for this request */
	u8		       sbal_last;      /* last possible SBAL for
						  this reuest */
	u8		       sbal_curr;      /* current SBAL during creation
						  of request */
	u8		       sbale_curr;     /* current SBALE during creation
						  of request */
	wait_queue_head_t      completion_wq;  /* can be used by a routine
						  to wait for completion */
	volatile u32	       status;	       /* status of this request */
	u32		       fsf_command;    /* FSF Command copy */
	struct fsf_qtcb	       *qtcb;	       /* address of associated QTCB */
	u32		       seq_no;         /* Sequence number of request */
        unsigned long          data;           /* private data of request */ 
	struct zfcp_erp_action *erp_action;    /* used if this request is
						  issued on behalf of erp */
	mempool_t	       *pool;	       /* used if request was alloacted
						  from emergency pool */
	unsigned long long     issued;         /* request sent time (STCK) */
	struct zfcp_unit       *unit;
};

typedef void zfcp_fsf_req_handler_t(struct zfcp_fsf_req*);

/* driver data */
struct zfcp_data {
	struct scsi_host_template scsi_host_template;
        atomic_t                status;             /* Module status flags */
	struct list_head	adapter_list_head;  /* head of adapter list */
	struct list_head	adapter_remove_lh;  /* head of adapters to be
						       removed */
        rwlock_t                status_read_lock;   /* for status read thread */
        struct list_head        status_read_receive_head;
        struct list_head        status_read_send_head;
        struct semaphore        status_read_sema;
	wait_queue_head_t	status_read_thread_wqh;
	u32			adapters;	    /* # of adapters in list */
	rwlock_t                config_lock;        /* serialises changes
						       to adapter/port/unit
						       lists */
	struct semaphore        config_sema;        /* serialises configuration
						       changes */
	atomic_t		loglevel;            /* current loglevel */
	char                    init_busid[BUS_ID_SIZE];
	wwn_t                   init_wwpn;
	fcp_lun_t               init_fcp_lun;
	char 			*driver_version;
};

/**
 * struct zfcp_sg_list - struct describing a scatter-gather list
 * @sg: pointer to array of (struct scatterlist)
 * @count: number of elements in scatter-gather list
 */
struct zfcp_sg_list {
	struct scatterlist *sg;
	unsigned int count;
};

/* number of elements for various memory pools */
#define ZFCP_POOL_FSF_REQ_ERP_NR	1
#define ZFCP_POOL_FSF_REQ_SCSI_NR	1
#define ZFCP_POOL_FSF_REQ_ABORT_NR	1
#define ZFCP_POOL_STATUS_READ_NR	ZFCP_STATUS_READS_RECOM
#define ZFCP_POOL_DATA_GID_PN_NR	1

/* struct used by memory pools for fsf_requests */
struct zfcp_fsf_req_pool_element {
	struct zfcp_fsf_req fsf_req;
	struct fsf_qtcb qtcb;
};

/********************** ZFCP SPECIFIC DEFINES ********************************/

#define ZFCP_FSFREQ_CLEANUP_TIMEOUT	HZ/10

#define ZFCP_KNOWN              0x00000001
#define ZFCP_REQ_AUTO_CLEANUP	0x00000002
#define ZFCP_WAIT_FOR_SBAL	0x00000004
#define ZFCP_REQ_NO_QTCB	0x00000008

#define ZFCP_SET                0x00000100
#define ZFCP_CLEAR              0x00000200

#define ZFCP_INTERRUPTIBLE	1
#define ZFCP_UNINTERRUPTIBLE	0

#ifndef atomic_test_mask
#define atomic_test_mask(mask, target) \
           ((atomic_read(target) & mask) == mask)
#endif

extern void _zfcp_hex_dump(char *, int);
#define ZFCP_HEX_DUMP(level, addr, count) \
		if (ZFCP_LOG_CHECK(level)) { \
			_zfcp_hex_dump(addr, count); \
		}

#define zfcp_get_busid_by_adapter(adapter) (adapter->ccw_device->dev.bus_id)
#define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
#define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))

/*
 *  functions needed for reference/usage counting
 */

static inline void
zfcp_unit_get(struct zfcp_unit *unit)
{
	atomic_inc(&unit->refcount);
}

static inline void
zfcp_unit_put(struct zfcp_unit *unit)
{
	if (atomic_dec_return(&unit->refcount) == 0)
		wake_up(&unit->remove_wq);
}

static inline void
zfcp_unit_wait(struct zfcp_unit *unit)
{
	wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
}

static inline void
zfcp_port_get(struct zfcp_port *port)
{
	atomic_inc(&port->refcount);
}

static inline void
zfcp_port_put(struct zfcp_port *port)
{
	if (atomic_dec_return(&port->refcount) == 0)
		wake_up(&port->remove_wq);
}

static inline void
zfcp_port_wait(struct zfcp_port *port)
{
	wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
}

static inline void
zfcp_adapter_get(struct zfcp_adapter *adapter)
{
	atomic_inc(&adapter->refcount);
}

static inline void
zfcp_adapter_put(struct zfcp_adapter *adapter)
{
	if (atomic_dec_return(&adapter->refcount) == 0)
		wake_up(&adapter->remove_wq);
}

static inline void
zfcp_adapter_wait(struct zfcp_adapter *adapter)
{
	wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
}

#endif /* ZFCP_DEF_H */