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   1 /*
   2  * zfcp device driver
   3  *
   4  * Global definitions for the zfcp device driver.
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #ifndef ZFCP_DEF_H
  10 #define ZFCP_DEF_H
  11
  12 /*************************** INCLUDES *****************************************/
  13
  14 #include <linux/init.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/major.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/delay.h>
  19 #include <linux/timer.h>
  20 #include <linux/slab.h>
  21 #include <linux/mempool.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/ioctl.h>
  25 #include <scsi/fc/fc_fs.h>
  26 #include <scsi/fc/fc_gs.h>
  27 #include <scsi/scsi.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <scsi/scsi_cmnd.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include <scsi/scsi_bsg_fc.h>
  35 #include <asm/ccwdev.h>
  36 #include <asm/qdio.h>
  37 #include <asm/debug.h>
  38 #include <asm/ebcdic.h>
  39 #include <asm/sysinfo.h>
  40 #include "zfcp_fsf.h"
  41
  42 /********************* GENERAL DEFINES *********************************/
  43
  44 #define REQUEST_LIST_SIZE 128
  45
  46 /********************* SCSI SPECIFIC DEFINES *********************************/
  47 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  48
  49 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  50
  51 /* DMQ bug workaround: don't use last SBALE */
  52 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  53
  54 /* index of last SBALE (with respect to DMQ bug workaround) */
  55 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  56
  57 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  58 #define ZFCP_MAX_SBALES_PER_REQ         \
  59         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  60         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  61
  62 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  63         /* max. number of (data buffer) SBALEs in largest SBAL chain
  64            multiplied with number of sectors per 4k block */
  65
  66 /********************* FSF SPECIFIC DEFINES *********************************/
  67
  68 /* ATTENTION: value must not be used by hardware */
  69 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  70
  71 /* timeout value for "default timer" for fsf requests */
  72 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  73
  74 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
  75
  76 /* timeout for name-server lookup (in seconds) */
  77 #define ZFCP_NS_GID_PN_TIMEOUT          10
  78
  79 /* task attribute values in FCP-2 FCP_CMND IU */
  80 #define SIMPLE_Q        0
  81 #define HEAD_OF_Q       1
  82 #define ORDERED_Q       2
  83 #define ACA_Q           4
  84 #define UNTAGGED        5
  85
  86 /* task management flags in FCP-2 FCP_CMND IU */
  87 #define FCP_CLEAR_ACA           0x40
  88 #define FCP_TARGET_RESET        0x20
  89 #define FCP_LOGICAL_UNIT_RESET  0x10
  90 #define FCP_CLEAR_TASK_SET      0x04
  91 #define FCP_ABORT_TASK_SET      0x02
  92
  93 #define FCP_CDB_LENGTH          16
  94
  95 #define ZFCP_DID_MASK           0x00FFFFFF
  96
  97 /* FCP(-2) FCP_CMND IU */
  98 struct fcp_cmnd_iu {
  99         u64 fcp_lun;       /* FCP logical unit number */
 100         u8  crn;                   /* command reference number */
 101         u8  reserved0:5;           /* reserved */
 102         u8  task_attribute:3;      /* task attribute */
 103         u8  task_management_flags; /* task management flags */
 104         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 105         u8  rddata:1;              /* read data */
 106         u8  wddata:1;              /* write data */
 107         u8  fcp_cdb[FCP_CDB_LENGTH];
 108 } __attribute__((packed));
 109
 110 /* FCP(-2) FCP_RSP IU */
 111 struct fcp_rsp_iu {
 112         u8  reserved0[10];
 113         union {
 114                 struct {
 115                         u8 reserved1:3;
 116                         u8 fcp_conf_req:1;
 117                         u8 fcp_resid_under:1;
 118                         u8 fcp_resid_over:1;
 119                         u8 fcp_sns_len_valid:1;
 120                         u8 fcp_rsp_len_valid:1;
 121                 } bits;
 122                 u8 value;
 123         } validity;
 124         u8  scsi_status;
 125         u32 fcp_resid;
 126         u32 fcp_sns_len;
 127         u32 fcp_rsp_len;
 128 } __attribute__((packed));
 129
 130
 131 #define RSP_CODE_GOOD            0
 132 #define RSP_CODE_LENGTH_MISMATCH 1
 133 #define RSP_CODE_FIELD_INVALID   2
 134 #define RSP_CODE_RO_MISMATCH     3
 135 #define RSP_CODE_TASKMAN_UNSUPP  4
 136 #define RSP_CODE_TASKMAN_FAILED  5
 137
 138 /* see fc-fs */
 139 #define LS_RSCN  0x61
 140 #define LS_LOGO  0x05
 141 #define LS_PLOGI 0x03
 142
 143 struct fcp_rscn_head {
 144         u8  command;
 145         u8  page_length; /* always 0x04 */
 146         u16 payload_len;
 147 } __attribute__((packed));
 148
 149 struct fcp_rscn_element {
 150         u8  reserved:2;
 151         u8  event_qual:4;
 152         u8  addr_format:2;
 153         u32 nport_did:24;
 154 } __attribute__((packed));
 155
 156 /* see fc-ph */
 157 struct fcp_logo {
 158         u32 command;
 159         u32 nport_did;
 160         u64 nport_wwpn;
 161 } __attribute__((packed));
 162
 163 /*
 164  * FC-FS stuff
 165  */
 166 #define R_A_TOV                         10 /* seconds */
 167
 168 #define ZFCP_LS_RLS                     0x0f
 169 #define ZFCP_LS_ADISC                   0x52
 170 #define ZFCP_LS_RPS                     0x56
 171 #define ZFCP_LS_RSCN                    0x61
 172 #define ZFCP_LS_RNID                    0x78
 173
 174 struct zfcp_ls_adisc {
 175         u8              code;
 176         u8              field[3];
 177         u32             hard_nport_id;
 178         u64             wwpn;
 179         u64             wwnn;
 180         u32             nport_id;
 181 } __attribute__ ((packed));
 182
 183 /*
 184  * FC-GS-2 stuff
 185  */
 186 #define ZFCP_CT_REVISION                0x01
 187 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 188 #define ZFCP_CT_NAME_SERVER             0x02
 189 #define ZFCP_CT_SYNCHRONOUS             0x00
 190 #define ZFCP_CT_SCSI_FCP                0x08
 191 #define ZFCP_CT_UNABLE_TO_PERFORM_CMD   0x09
 192 #define ZFCP_CT_GID_PN                  0x0121
 193 #define ZFCP_CT_GPN_FT                  0x0172
 194 #define ZFCP_CT_ACCEPT                  0x8002
 195 #define ZFCP_CT_REJECT                  0x8001
 196
 197 /*
 198  * FC-GS-4 stuff
 199  */
 200 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 201
 202 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 203
 204 /*
 205  * Note, the leftmost status byte is common among adapter, port
 206  * and unit
 207  */
 208 #define ZFCP_COMMON_FLAGS                       0xfff00000
 209
 210 /* common status bits */
 211 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 212 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 213 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 214 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 215 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 216 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 217 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 218 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 219 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
 220
 221 /* adapter status */
 222 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 223 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 224 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 225 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 226 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 227 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 228 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 229
 230 /* FC-PH/FC-GS well-known address identifiers for generic services */
 231 #define ZFCP_DID_WKA                            0xFFFFF0
 232
 233 /* remote port status */
 234 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 235 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
 236
 237 /* well known address (WKA) port status*/
 238 enum zfcp_wka_status {
 239         ZFCP_WKA_PORT_OFFLINE,
 240         ZFCP_WKA_PORT_CLOSING,
 241         ZFCP_WKA_PORT_OPENING,
 242         ZFCP_WKA_PORT_ONLINE,
 243 };
 244
 245 /* logical unit status */
 246 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 247 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 248
 249 /* FSF request status (this does not have a common part) */
 250 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 251 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 252 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 253 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 254 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 255 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 256 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 257 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 258 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 259 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 260
 261 /************************* STRUCTURE DEFINITIONS *****************************/
 262
 263 struct zfcp_fsf_req;
 264
 265 /* holds various memory pools of an adapter */
 266 struct zfcp_adapter_mempool {
 267         mempool_t *erp_req;
 268         mempool_t *scsi_req;
 269         mempool_t *scsi_abort;
 270         mempool_t *status_read_req;
 271         mempool_t *status_read_data;
 272         mempool_t *gid_pn_data;
 273         mempool_t *qtcb_pool;
 274 };
 275
 276 /*
 277  * header for CT_IU
 278  */
 279 struct ct_hdr {
 280         u8 revision;            // 0x01
 281         u8 in_id[3];            // 0x00
 282         u8 gs_type;             // 0xFC Directory Service
 283         u8 gs_subtype;          // 0x02 Name Server
 284         u8 options;             // 0x00 single bidirectional exchange
 285         u8 reserved0;
 286         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 287         u16 max_res_size;       // <= (4096 - 16) / 4
 288         u8 reserved1;
 289         u8 reason_code;
 290         u8 reason_code_expl;
 291         u8 vendor_unique;
 292 } __attribute__ ((packed));
 293
 294 /* nameserver request CT_IU -- for requests where
 295  * a port name is required */
 296 struct ct_iu_gid_pn_req {
 297         struct ct_hdr header;
 298         u64 wwpn;
 299 } __attribute__ ((packed));
 300
 301 /* FS_ACC IU and data unit for GID_PN nameserver request */
 302 struct ct_iu_gid_pn_resp {
 303         struct ct_hdr header;
 304         u32 d_id;
 305 } __attribute__ ((packed));
 306
 307 struct ct_iu_gpn_ft_req {
 308         struct ct_hdr header;
 309         u8 flags;
 310         u8 domain_id_scope;
 311         u8 area_id_scope;
 312         u8 fc4_type;
 313 } __attribute__ ((packed));
 314
 315
 316 /**
 317  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 318  * @wka_port: port where the request is sent to
 319  * @req: scatter-gather list for request
 320  * @resp: scatter-gather list for response
 321  * @handler: handler function (called for response to the request)
 322  * @handler_data: data passed to handler function
 323  * @timeout: FSF timeout for this request
 324  * @completion: completion for synchronization purposes
 325  * @status: used to pass error status to calling function
 326  */
 327 struct zfcp_send_ct {
 328         struct zfcp_wka_port *wka_port;
 329         struct scatterlist *req;
 330         struct scatterlist *resp;
 331         void (*handler)(unsigned long);
 332         unsigned long handler_data;
 333         int timeout;
 334         struct completion *completion;
 335         int status;
 336 };
 337
 338 /* used for name server requests in error recovery */
 339 struct zfcp_gid_pn_data {
 340         struct zfcp_send_ct ct;
 341         struct scatterlist req;
 342         struct scatterlist resp;
 343         struct ct_iu_gid_pn_req ct_iu_req;
 344         struct ct_iu_gid_pn_resp ct_iu_resp;
 345         struct zfcp_port *port;
 346 };
 347
 348 /**
 349  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 350  * @adapter: adapter where request is sent from
 351  * @port: port where ELS is destinated (port reference count has to be increased)
 352  * @d_id: destiniation id of port where request is sent to
 353  * @req: scatter-gather list for request
 354  * @resp: scatter-gather list for response
 355  * @handler: handler function (called for response to the request)
 356  * @handler_data: data passed to handler function
 357  * @completion: completion for synchronization purposes
 358  * @ls_code: hex code of ELS command
 359  * @status: used to pass error status to calling function
 360  */
 361 struct zfcp_send_els {
 362         struct zfcp_adapter *adapter;
 363         struct zfcp_port *port;
 364         u32 d_id;
 365         struct scatterlist *req;
 366         struct scatterlist *resp;
 367         void (*handler)(unsigned long);
 368         unsigned long handler_data;
 369         struct completion *completion;
 370         int ls_code;
 371         int status;
 372 };
 373
 374 struct zfcp_wka_port {
 375         struct zfcp_adapter     *adapter;
 376         wait_queue_head_t       completion_wq;
 377         enum zfcp_wka_status    status;
 378         atomic_t                refcount;
 379         u32                     d_id;
 380         u32                     handle;
 381         struct mutex            mutex;
 382         struct delayed_work     work;
 383 };
 384
 385 struct zfcp_wka_ports {
 386         struct zfcp_wka_port ms;        /* management service */
 387         struct zfcp_wka_port ts;        /* time service */
 388         struct zfcp_wka_port ds;        /* directory service */
 389         struct zfcp_wka_port as;        /* alias service */
 390         struct zfcp_wka_port ks;        /* key distribution service */
 391 };
 392
 393 struct zfcp_qdio_queue {
 394         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 395         u8                 first;       /* index of next free bfr in queue */
 396         atomic_t           count;       /* number of free buffers in queue */
 397 };
 398
 399 struct zfcp_erp_action {
 400         struct list_head list;
 401         int action;                   /* requested action code */
 402         struct zfcp_adapter *adapter; /* device which should be recovered */
 403         struct zfcp_port *port;
 404         struct zfcp_unit *unit;
 405         u32             status;       /* recovery status */
 406         u32 step;                     /* active step of this erp action */
 407         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 408                                          for this action */
 409         struct timer_list timer;
 410 };
 411
 412 struct fsf_latency_record {
 413         u32 min;
 414         u32 max;
 415         u64 sum;
 416 };
 417
 418 struct latency_cont {
 419         struct fsf_latency_record channel;
 420         struct fsf_latency_record fabric;
 421         u64 counter;
 422 };
 423
 424 struct zfcp_latencies {
 425         struct latency_cont read;
 426         struct latency_cont write;
 427         struct latency_cont cmd;
 428         spinlock_t lock;
 429 };
 430
 431 struct zfcp_adapter {
 432         atomic_t                refcount;          /* reference count */
 433         wait_queue_head_t       remove_wq;         /* can be used to wait for
 434                                                       refcount drop to zero */
 435         u64                     peer_wwnn;         /* P2P peer WWNN */
 436         u64                     peer_wwpn;         /* P2P peer WWPN */
 437         u32                     peer_d_id;         /* P2P peer D_ID */
 438         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 439         u32                     hydra_version;     /* Hydra version */
 440         u32                     fsf_lic_version;
 441         u32                     adapter_features;  /* FCP channel features */
 442         u32                     connection_features; /* host connection features */
 443         u32                     hardware_version;  /* of FCP channel */
 444         u16                     timer_ticks;       /* time int for a tick */
 445         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 446         struct list_head        port_list_head;    /* remote port list */
 447         unsigned long           req_no;            /* unique FSF req number */
 448         struct list_head        *req_list;         /* list of pending reqs */
 449         spinlock_t              req_list_lock;     /* request list lock */
 450         struct zfcp_qdio_queue  req_q;             /* request queue */
 451         spinlock_t              req_q_lock;        /* for operations on queue */
 452         ktime_t                 req_q_time; /* time of last fill level change */
 453         u64                     req_q_util; /* for accounting */
 454         spinlock_t              qdio_stat_lock;
 455         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 456         wait_queue_head_t       request_wq;        /* can be used to wait for
 457                                                       more avaliable SBALs */
 458         struct zfcp_qdio_queue  resp_q;    /* response queue */
 459         rwlock_t                abort_lock;        /* Protects against SCSI
 460                                                       stack abort/command
 461                                                       completion races */
 462         atomic_t                stat_miss;         /* # missing status reads*/
 463         struct work_struct      stat_work;
 464         atomic_t                status;            /* status of this adapter */
 465         struct list_head        erp_ready_head;    /* error recovery for this
 466                                                       adapter/devices */
 467         struct list_head        erp_running_head;
 468         rwlock_t                erp_lock;
 469         struct semaphore        erp_ready_sem;
 470         wait_queue_head_t       erp_thread_wqh;
 471         wait_queue_head_t       erp_done_wqh;
 472         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 473         atomic_t                erp_counter;
 474         u32                     erp_total_count;   /* total nr of enqueued erp
 475                                                       actions */
 476         u32                     erp_low_mem_count; /* nr of erp actions waiting
 477                                                       for memory */
 478         struct zfcp_wka_ports   *gs;               /* generic services */
 479         struct zfcp_dbf         *dbf;              /* debug traces */
 480         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 481         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 482         struct fc_host_statistics *fc_stats;
 483         struct fsf_qtcb_bottom_port *stats_reset_data;
 484         unsigned long           stats_reset;
 485         struct work_struct      scan_work;
 486         struct service_level    service_level;
 487         atomic_t                qdio_outb_full;    /* queue full incidents */
 488 };
 489
 490 struct zfcp_port {
 491         struct device          sysfs_device;   /* sysfs device */
 492         struct fc_rport        *rport;         /* rport of fc transport class */
 493         struct list_head       list;           /* list of remote ports */
 494         atomic_t               refcount;       /* reference count */
 495         wait_queue_head_t      remove_wq;      /* can be used to wait for
 496                                                   refcount drop to zero */
 497         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 498         struct list_head       unit_list_head; /* head of logical unit list */
 499         atomic_t               status;         /* status of this remote port */
 500         u64                    wwnn;           /* WWNN if known */
 501         u64                    wwpn;           /* WWPN */
 502         u32                    d_id;           /* D_ID */
 503         u32                    handle;         /* handle assigned by FSF */
 504         struct zfcp_erp_action erp_action;     /* pending error recovery */
 505         atomic_t               erp_counter;
 506         u32                    maxframe_size;
 507         u32                    supported_classes;
 508         struct work_struct     gid_pn_work;
 509         struct work_struct     test_link_work;
 510         struct work_struct     rport_work;
 511         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 512 };
 513
 514 struct zfcp_unit {
 515         struct device          sysfs_device;   /* sysfs device */
 516         struct list_head       list;           /* list of logical units */
 517         atomic_t               refcount;       /* reference count */
 518         wait_queue_head_t      remove_wq;      /* can be used to wait for
 519                                                   refcount drop to zero */
 520         struct zfcp_port       *port;          /* remote port of unit */
 521         atomic_t               status;         /* status of this logical unit */
 522         u64                    fcp_lun;        /* own FCP_LUN */
 523         u32                    handle;         /* handle assigned by FSF */
 524         struct scsi_device     *device;        /* scsi device struct pointer */
 525         struct zfcp_erp_action erp_action;     /* pending error recovery */
 526         atomic_t               erp_counter;
 527         struct zfcp_latencies   latencies;
 528         struct work_struct      scsi_work;
 529 };
 530
 531 /* FSF request */
 532 struct zfcp_fsf_req {
 533         struct list_head       list;           /* list of FSF requests */
 534         unsigned long          req_id;         /* unique request ID */
 535         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 536         u8                     sbal_number;    /* nr of SBALs free for use */
 537         u8                     sbal_first;     /* first SBAL for this request */
 538         u8                     sbal_last;      /* last SBAL for this request */
 539         u8                     sbal_limit;      /* last possible SBAL for
 540                                                   this reuest */
 541         u8                     sbale_curr;     /* current SBALE during creation
 542                                                   of request */
 543         u8                      sbal_response;  /* SBAL used in interrupt */
 544         struct completion       completion;     /* can be used by a routine
 545                                                   to wait for completion */
 546         u32                     status;        /* status of this request */
 547         u32                    fsf_command;    /* FSF Command copy */
 548         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
 549         u32                    seq_no;         /* Sequence number of request */
 550         void                    *data;           /* private data of request */
 551         struct timer_list     timer;           /* used for erp or scsi er */
 552         struct zfcp_erp_action *erp_action;    /* used if this request is
 553                                                   issued on behalf of erp */
 554         mempool_t              *pool;          /* used if request was alloacted
 555                                                   from emergency pool */
 556         unsigned long long     issued;         /* request sent time (STCK) */
 557         struct zfcp_unit       *unit;
 558         void                    (*handler)(struct zfcp_fsf_req *);
 559         u16                     qdio_outb_usage;/* usage of outbound queue */
 560         u16                     qdio_inb_usage; /* usage of inbound queue */
 561 };
 562
 563 /* driver data */
 564 struct zfcp_data {
 565         struct scsi_host_template scsi_host_template;
 566         struct scsi_transport_template *scsi_transport_template;
 567         rwlock_t                config_lock;        /* serialises changes
 568                                                        to adapter/port/unit
 569                                                        lists */
 570         struct semaphore        config_sema;        /* serialises configuration
 571                                                        changes */
 572         struct kmem_cache       *gpn_ft_cache;
 573         struct kmem_cache       *qtcb_cache;
 574         struct kmem_cache       *sr_buffer_cache;
 575         struct kmem_cache       *gid_pn_cache;
 576         struct workqueue_struct *work_queue;
 577 };
 578
 579 /********************** ZFCP SPECIFIC DEFINES ********************************/
 580
 581 #define ZFCP_SET                0x00000100
 582 #define ZFCP_CLEAR              0x00000200
 583
 584 /*
 585  * Helper functions for request ID management.
 586  */
 587 static inline int zfcp_reqlist_hash(unsigned long req_id)
 588 {
 589         return req_id % REQUEST_LIST_SIZE;
 590 }
 591
 592 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 593                                        struct zfcp_fsf_req *fsf_req)
 594 {
 595         list_del(&fsf_req->list);
 596 }
 597
 598 static inline struct zfcp_fsf_req *
 599 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 600 {
 601         struct zfcp_fsf_req *request;
 602         unsigned int idx;
 603
 604         idx = zfcp_reqlist_hash(req_id);
 605         list_for_each_entry(request, &adapter->req_list[idx], list)
 606                 if (request->req_id == req_id)
 607                         return request;
 608         return NULL;
 609 }
 610
 611 static inline struct zfcp_fsf_req *
 612 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 613 {
 614         struct zfcp_fsf_req *request;
 615         unsigned int idx;
 616
 617         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 618                 list_for_each_entry(request, &adapter->req_list[idx], list)
 619                         if (request == req)
 620                                 return request;
 621         }
 622         return NULL;
 623 }
 624
 625 /*
 626  *  functions needed for reference/usage counting
 627  */
 628
 629 static inline void
 630 zfcp_unit_get(struct zfcp_unit *unit)
 631 {
 632         atomic_inc(&unit->refcount);
 633 }
 634
 635 static inline void
 636 zfcp_unit_put(struct zfcp_unit *unit)
 637 {
 638         if (atomic_dec_return(&unit->refcount) == 0)
 639                 wake_up(&unit->remove_wq);
 640 }
 641
 642 static inline void
 643 zfcp_port_get(struct zfcp_port *port)
 644 {
 645         atomic_inc(&port->refcount);
 646 }
 647
 648 static inline void
 649 zfcp_port_put(struct zfcp_port *port)
 650 {
 651         if (atomic_dec_return(&port->refcount) == 0)
 652                 wake_up(&port->remove_wq);
 653 }
 654
 655 static inline void
 656 zfcp_adapter_get(struct zfcp_adapter *adapter)
 657 {
 658         atomic_inc(&adapter->refcount);
 659 }
 660
 661 static inline void
 662 zfcp_adapter_put(struct zfcp_adapter *adapter)
 663 {
 664         if (atomic_dec_return(&adapter->refcount) == 0)
 665                 wake_up(&adapter->remove_wq);
 666 }
 667
 668 #endif /* ZFCP_DEF_H */