drivers/s390/scsi/zfcp_def.h

   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_dbf.h"
  41 #include "zfcp_fsf.h"
  42
  43
  44 /********************* GENERAL DEFINES *********************************/
  45
  46 #define REQUEST_LIST_SIZE 128
  47
  48 /********************* SCSI SPECIFIC DEFINES *********************************/
  49 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  50
  51 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  52
  53 /* DMQ bug workaround: don't use last SBALE */
  54 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  55
  56 /* index of last SBALE (with respect to DMQ bug workaround) */
  57 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  58
  59 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  60 #define ZFCP_MAX_SBALES_PER_REQ         \
  61         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  62         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  63
  64 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  65         /* max. number of (data buffer) SBALEs in largest SBAL chain
  66            multiplied with number of sectors per 4k block */
  67
  68 /********************* FSF SPECIFIC DEFINES *********************************/
  69
  70 /* ATTENTION: value must not be used by hardware */
  71 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  72
  73 /* timeout value for "default timer" for fsf requests */
  74 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  75
  76 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
  77
  78 /* timeout for name-server lookup (in seconds) */
  79 #define ZFCP_NS_GID_PN_TIMEOUT          10
  80
  81 /* task attribute values in FCP-2 FCP_CMND IU */
  82 #define SIMPLE_Q        0
  83 #define HEAD_OF_Q       1
  84 #define ORDERED_Q       2
  85 #define ACA_Q           4
  86 #define UNTAGGED        5
  87
  88 /* task management flags in FCP-2 FCP_CMND IU */
  89 #define FCP_CLEAR_ACA           0x40
  90 #define FCP_TARGET_RESET        0x20
  91 #define FCP_LOGICAL_UNIT_RESET  0x10
  92 #define FCP_CLEAR_TASK_SET      0x04
  93 #define FCP_ABORT_TASK_SET      0x02
  94
  95 #define FCP_CDB_LENGTH          16
  96
  97 #define ZFCP_DID_MASK           0x00FFFFFF
  98
  99 /* FCP(-2) FCP_CMND IU */
 100 struct fcp_cmnd_iu {
 101         u64 fcp_lun;       /* FCP logical unit number */
 102         u8  crn;                   /* command reference number */
 103         u8  reserved0:5;           /* reserved */
 104         u8  task_attribute:3;      /* task attribute */
 105         u8  task_management_flags; /* task management flags */
 106         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 107         u8  rddata:1;              /* read data */
 108         u8  wddata:1;              /* write data */
 109         u8  fcp_cdb[FCP_CDB_LENGTH];
 110 } __attribute__((packed));
 111
 112 /* FCP(-2) FCP_RSP IU */
 113 struct fcp_rsp_iu {
 114         u8  reserved0[10];
 115         union {
 116                 struct {
 117                         u8 reserved1:3;
 118                         u8 fcp_conf_req:1;
 119                         u8 fcp_resid_under:1;
 120                         u8 fcp_resid_over:1;
 121                         u8 fcp_sns_len_valid:1;
 122                         u8 fcp_rsp_len_valid:1;
 123                 } bits;
 124                 u8 value;
 125         } validity;
 126         u8  scsi_status;
 127         u32 fcp_resid;
 128         u32 fcp_sns_len;
 129         u32 fcp_rsp_len;
 130 } __attribute__((packed));
 131
 132
 133 #define RSP_CODE_GOOD            0
 134 #define RSP_CODE_LENGTH_MISMATCH 1
 135 #define RSP_CODE_FIELD_INVALID   2
 136 #define RSP_CODE_RO_MISMATCH     3
 137 #define RSP_CODE_TASKMAN_UNSUPP  4
 138 #define RSP_CODE_TASKMAN_FAILED  5
 139
 140 /* see fc-fs */
 141 #define LS_RSCN  0x61
 142 #define LS_LOGO  0x05
 143 #define LS_PLOGI 0x03
 144
 145 struct fcp_rscn_head {
 146         u8  command;
 147         u8  page_length; /* always 0x04 */
 148         u16 payload_len;
 149 } __attribute__((packed));
 150
 151 struct fcp_rscn_element {
 152         u8  reserved:2;
 153         u8  event_qual:4;
 154         u8  addr_format:2;
 155         u32 nport_did:24;
 156 } __attribute__((packed));
 157
 158 /* see fc-ph */
 159 struct fcp_logo {
 160         u32 command;
 161         u32 nport_did;
 162         u64 nport_wwpn;
 163 } __attribute__((packed));
 164
 165 /*
 166  * FC-FS stuff
 167  */
 168 #define R_A_TOV                         10 /* seconds */
 169
 170 #define ZFCP_LS_RLS                     0x0f
 171 #define ZFCP_LS_ADISC                   0x52
 172 #define ZFCP_LS_RPS                     0x56
 173 #define ZFCP_LS_RSCN                    0x61
 174 #define ZFCP_LS_RNID                    0x78
 175
 176 struct zfcp_ls_adisc {
 177         u8              code;
 178         u8              field[3];
 179         u32             hard_nport_id;
 180         u64             wwpn;
 181         u64             wwnn;
 182         u32             nport_id;
 183 } __attribute__ ((packed));
 184
 185 /*
 186  * FC-GS-2 stuff
 187  */
 188 #define ZFCP_CT_REVISION                0x01
 189 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 190 #define ZFCP_CT_NAME_SERVER             0x02
 191 #define ZFCP_CT_SYNCHRONOUS             0x00
 192 #define ZFCP_CT_SCSI_FCP                0x08
 193 #define ZFCP_CT_UNABLE_TO_PERFORM_CMD   0x09
 194 #define ZFCP_CT_GID_PN                  0x0121
 195 #define ZFCP_CT_GPN_FT                  0x0172
 196 #define ZFCP_CT_ACCEPT                  0x8002
 197 #define ZFCP_CT_REJECT                  0x8001
 198
 199 /*
 200  * FC-GS-4 stuff
 201  */
 202 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 203
 204 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 205
 206 /*
 207  * Note, the leftmost status byte is common among adapter, port
 208  * and unit
 209  */
 210 #define ZFCP_COMMON_FLAGS                       0xfff00000
 211
 212 /* common status bits */
 213 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 214 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 215 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 216 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 217 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 218 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 219 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 220 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 221 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
 222
 223 /* adapter status */
 224 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 225 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 226 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 227 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 228 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 229 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 230 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 231
 232 /* FC-PH/FC-GS well-known address identifiers for generic services */
 233 #define ZFCP_DID_WKA                            0xFFFFF0
 234
 235 /* remote port status */
 236 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 237
 238 /* well known address (WKA) port status*/
 239 enum zfcp_wka_status {
 240         ZFCP_WKA_PORT_OFFLINE,
 241         ZFCP_WKA_PORT_CLOSING,
 242         ZFCP_WKA_PORT_OPENING,
 243         ZFCP_WKA_PORT_ONLINE,
 244 };
 245
 246 /* logical unit status */
 247 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 248 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 249
 250 /* FSF request status (this does not have a common part) */
 251 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 252 #define ZFCP_STATUS_FSFREQ_COMPLETED            0x00000004
 253 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 254 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 255 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 256 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 257 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 258 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 259 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 260 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 261 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 262
 263 /************************* STRUCTURE DEFINITIONS *****************************/
 264
 265 struct zfcp_fsf_req;
 266
 267 /* holds various memory pools of an adapter */
 268 struct zfcp_adapter_mempool {
 269         mempool_t *fsf_req_erp;
 270         mempool_t *fsf_req_scsi;
 271         mempool_t *fsf_req_abort;
 272         mempool_t *fsf_req_status_read;
 273         mempool_t *data_status_read;
 274         mempool_t *data_gid_pn;
 275 };
 276
 277 /*
 278  * header for CT_IU
 279  */
 280 struct ct_hdr {
 281         u8 revision;            // 0x01
 282         u8 in_id[3];            // 0x00
 283         u8 gs_type;             // 0xFC Directory Service
 284         u8 gs_subtype;          // 0x02 Name Server
 285         u8 options;             // 0x00 single bidirectional exchange
 286         u8 reserved0;
 287         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 288         u16 max_res_size;       // <= (4096 - 16) / 4
 289         u8 reserved1;
 290         u8 reason_code;
 291         u8 reason_code_expl;
 292         u8 vendor_unique;
 293 } __attribute__ ((packed));
 294
 295 /* nameserver request CT_IU -- for requests where
 296  * a port name is required */
 297 struct ct_iu_gid_pn_req {
 298         struct ct_hdr header;
 299         u64 wwpn;
 300 } __attribute__ ((packed));
 301
 302 /* FS_ACC IU and data unit for GID_PN nameserver request */
 303 struct ct_iu_gid_pn_resp {
 304         struct ct_hdr header;
 305         u32 d_id;
 306 } __attribute__ ((packed));
 307
 308 /**
 309  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 310  * @wka_port: port where the request is sent to
 311  * @req: scatter-gather list for request
 312  * @resp: scatter-gather list for response
 313  * @handler: handler function (called for response to the request)
 314  * @handler_data: data passed to handler function
 315  * @timeout: FSF timeout for this request
 316  * @completion: completion for synchronization purposes
 317  * @status: used to pass error status to calling function
 318  */
 319 struct zfcp_send_ct {
 320         struct zfcp_wka_port *wka_port;
 321         struct scatterlist *req;
 322         struct scatterlist *resp;
 323         void (*handler)(unsigned long);
 324         unsigned long handler_data;
 325         int timeout;
 326         struct completion *completion;
 327         int status;
 328 };
 329
 330 /* used for name server requests in error recovery */
 331 struct zfcp_gid_pn_data {
 332         struct zfcp_send_ct ct;
 333         struct scatterlist req;
 334         struct scatterlist resp;
 335         struct ct_iu_gid_pn_req ct_iu_req;
 336         struct ct_iu_gid_pn_resp ct_iu_resp;
 337         struct zfcp_port *port;
 338 };
 339
 340 /**
 341  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 342  * @adapter: adapter where request is sent from
 343  * @port: port where ELS is destinated (port reference count has to be increased)
 344  * @d_id: destiniation id of port where request is sent to
 345  * @req: scatter-gather list for request
 346  * @resp: scatter-gather list for response
 347  * @handler: handler function (called for response to the request)
 348  * @handler_data: data passed to handler function
 349  * @completion: completion for synchronization purposes
 350  * @ls_code: hex code of ELS command
 351  * @status: used to pass error status to calling function
 352  */
 353 struct zfcp_send_els {
 354         struct zfcp_adapter *adapter;
 355         struct zfcp_port *port;
 356         u32 d_id;
 357         struct scatterlist *req;
 358         struct scatterlist *resp;
 359         void (*handler)(unsigned long);
 360         unsigned long handler_data;
 361         struct completion *completion;
 362         int ls_code;
 363         int status;
 364 };
 365
 366 struct zfcp_wka_port {
 367         struct zfcp_adapter     *adapter;
 368         wait_queue_head_t       completion_wq;
 369         enum zfcp_wka_status    status;
 370         atomic_t                refcount;
 371         u32                     d_id;
 372         u32                     handle;
 373         struct mutex            mutex;
 374         struct delayed_work     work;
 375 };
 376
 377 struct zfcp_wka_ports {
 378         struct zfcp_wka_port ms;        /* management service */
 379         struct zfcp_wka_port ts;        /* time service */
 380         struct zfcp_wka_port ds;        /* directory service */
 381         struct zfcp_wka_port as;        /* alias service */
 382         struct zfcp_wka_port ks;        /* key distribution service */
 383 };
 384
 385 struct zfcp_qdio_queue {
 386         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 387         u8                 first;       /* index of next free bfr in queue */
 388         atomic_t           count;       /* number of free buffers in queue */
 389 };
 390
 391 struct zfcp_erp_action {
 392         struct list_head list;
 393         int action;                   /* requested action code */
 394         struct zfcp_adapter *adapter; /* device which should be recovered */
 395         struct zfcp_port *port;
 396         struct zfcp_unit *unit;
 397         u32             status;       /* recovery status */
 398         u32 step;                     /* active step of this erp action */
 399         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 400                                          for this action */
 401         struct timer_list timer;
 402 };
 403
 404 struct fsf_latency_record {
 405         u32 min;
 406         u32 max;
 407         u64 sum;
 408 };
 409
 410 struct latency_cont {
 411         struct fsf_latency_record channel;
 412         struct fsf_latency_record fabric;
 413         u64 counter;
 414 };
 415
 416 struct zfcp_latencies {
 417         struct latency_cont read;
 418         struct latency_cont write;
 419         struct latency_cont cmd;
 420         spinlock_t lock;
 421 };
 422
 423 struct zfcp_adapter {
 424         atomic_t                refcount;          /* reference count */
 425         wait_queue_head_t       remove_wq;         /* can be used to wait for
 426                                                       refcount drop to zero */
 427         u64                     peer_wwnn;         /* P2P peer WWNN */
 428         u64                     peer_wwpn;         /* P2P peer WWPN */
 429         u32                     peer_d_id;         /* P2P peer D_ID */
 430         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 431         u32                     hydra_version;     /* Hydra version */
 432         u32                     fsf_lic_version;
 433         u32                     adapter_features;  /* FCP channel features */
 434         u32                     connection_features; /* host connection features */
 435         u32                     hardware_version;  /* of FCP channel */
 436         u16                     timer_ticks;       /* time int for a tick */
 437         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 438         struct list_head        port_list_head;    /* remote port list */
 439         unsigned long           req_no;            /* unique FSF req number */
 440         struct list_head        *req_list;         /* list of pending reqs */
 441         spinlock_t              req_list_lock;     /* request list lock */
 442         struct zfcp_qdio_queue  req_q;             /* request queue */
 443         spinlock_t              req_q_lock;        /* for operations on queue */
 444         ktime_t                 req_q_time; /* time of last fill level change */
 445         u64                     req_q_util; /* for accounting */
 446         spinlock_t              qdio_stat_lock;
 447         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 448         wait_queue_head_t       request_wq;        /* can be used to wait for
 449                                                       more avaliable SBALs */
 450         struct zfcp_qdio_queue  resp_q;    /* response queue */
 451         rwlock_t                abort_lock;        /* Protects against SCSI
 452                                                       stack abort/command
 453                                                       completion races */
 454         atomic_t                stat_miss;         /* # missing status reads*/
 455         struct work_struct      stat_work;
 456         atomic_t                status;            /* status of this adapter */
 457         struct list_head        erp_ready_head;    /* error recovery for this
 458                                                       adapter/devices */
 459         struct list_head        erp_running_head;
 460         rwlock_t                erp_lock;
 461         struct semaphore        erp_ready_sem;
 462         wait_queue_head_t       erp_thread_wqh;
 463         wait_queue_head_t       erp_done_wqh;
 464         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 465         atomic_t                erp_counter;
 466         u32                     erp_total_count;   /* total nr of enqueued erp
 467                                                       actions */
 468         u32                     erp_low_mem_count; /* nr of erp actions waiting
 469                                                       for memory */
 470         struct zfcp_wka_ports   *gs;               /* generic services */
 471         debug_info_t            *rec_dbf;
 472         debug_info_t            *hba_dbf;
 473         debug_info_t            *san_dbf;          /* debug feature areas */
 474         debug_info_t            *scsi_dbf;
 475         spinlock_t              rec_dbf_lock;
 476         spinlock_t              hba_dbf_lock;
 477         spinlock_t              san_dbf_lock;
 478         spinlock_t              scsi_dbf_lock;
 479         struct zfcp_rec_dbf_record      rec_dbf_buf;
 480         struct zfcp_hba_dbf_record      hba_dbf_buf;
 481         struct zfcp_san_dbf_record      san_dbf_buf;
 482         struct zfcp_scsi_dbf_record     scsi_dbf_buf;
 483         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 484         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 485         struct fc_host_statistics *fc_stats;
 486         struct fsf_qtcb_bottom_port *stats_reset_data;
 487         unsigned long           stats_reset;
 488         struct work_struct      scan_work;
 489         struct service_level    service_level;
 490         atomic_t                qdio_outb_full;    /* queue full incidents */
 491 };
 492
 493 struct zfcp_port {
 494         struct device          sysfs_device;   /* sysfs device */
 495         struct fc_rport        *rport;         /* rport of fc transport class */
 496         struct list_head       list;           /* list of remote ports */
 497         atomic_t               refcount;       /* reference count */
 498         wait_queue_head_t      remove_wq;      /* can be used to wait for
 499                                                   refcount drop to zero */
 500         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 501         struct list_head       unit_list_head; /* head of logical unit list */
 502         atomic_t               status;         /* status of this remote port */
 503         u64                    wwnn;           /* WWNN if known */
 504         u64                    wwpn;           /* WWPN */
 505         u32                    d_id;           /* D_ID */
 506         u32                    handle;         /* handle assigned by FSF */
 507         struct zfcp_erp_action erp_action;     /* pending error recovery */
 508         atomic_t               erp_counter;
 509         u32                    maxframe_size;
 510         u32                    supported_classes;
 511         struct work_struct     gid_pn_work;
 512         struct work_struct     test_link_work;
 513         struct work_struct     rport_work;
 514         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 515 };
 516
 517 struct zfcp_unit {
 518         struct device          sysfs_device;   /* sysfs device */
 519         struct list_head       list;           /* list of logical units */
 520         atomic_t               refcount;       /* reference count */
 521         wait_queue_head_t      remove_wq;      /* can be used to wait for
 522                                                   refcount drop to zero */
 523         struct zfcp_port       *port;          /* remote port of unit */
 524         atomic_t               status;         /* status of this logical unit */
 525         u64                    fcp_lun;        /* own FCP_LUN */
 526         u32                    handle;         /* handle assigned by FSF */
 527         struct scsi_device     *device;        /* scsi device struct pointer */
 528         struct zfcp_erp_action erp_action;     /* pending error recovery */
 529         atomic_t               erp_counter;
 530         struct zfcp_latencies   latencies;
 531         struct work_struct      scsi_work;
 532 };
 533
 534 /* FSF request */
 535 struct zfcp_fsf_req {
 536         struct list_head       list;           /* list of FSF requests */
 537         unsigned long          req_id;         /* unique request ID */
 538         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 539         u8                     sbal_number;    /* nr of SBALs free for use */
 540         u8                     sbal_first;     /* first SBAL for this request */
 541         u8                     sbal_last;      /* last SBAL for this request */
 542         u8                     sbal_limit;      /* last possible SBAL for
 543                                                   this reuest */
 544         u8                     sbale_curr;     /* current SBALE during creation
 545                                                   of request */
 546         u8                      sbal_response;  /* SBAL used in interrupt */
 547         wait_queue_head_t      completion_wq;  /* can be used by a routine
 548                                                   to wait for completion */
 549         u32                     status;        /* status of this request */
 550         u32                    fsf_command;    /* FSF Command copy */
 551         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
 552         u32                    seq_no;         /* Sequence number of request */
 553         void                    *data;           /* private data of request */
 554         struct timer_list     timer;           /* used for erp or scsi er */
 555         struct zfcp_erp_action *erp_action;    /* used if this request is
 556                                                   issued on behalf of erp */
 557         mempool_t              *pool;          /* used if request was alloacted
 558                                                   from emergency pool */
 559         unsigned long long     issued;         /* request sent time (STCK) */
 560         struct zfcp_unit       *unit;
 561         void                    (*handler)(struct zfcp_fsf_req *);
 562         u16                     qdio_outb_usage;/* usage of outbound queue */
 563         u16                     qdio_inb_usage; /* usage of inbound queue */
 564 };
 565
 566 /* driver data */
 567 struct zfcp_data {
 568         struct scsi_host_template scsi_host_template;
 569         struct scsi_transport_template *scsi_transport_template;
 570         rwlock_t                config_lock;        /* serialises changes
 571                                                        to adapter/port/unit
 572                                                        lists */
 573         struct semaphore        config_sema;        /* serialises configuration
 574                                                        changes */
 575         struct kmem_cache       *fsf_req_qtcb_cache;
 576         struct kmem_cache       *sr_buffer_cache;
 577         struct kmem_cache       *gid_pn_cache;
 578         struct workqueue_struct *work_queue;
 579 };
 580
 581 /* struct used by memory pools for fsf_requests */
 582 struct zfcp_fsf_req_qtcb {
 583         struct zfcp_fsf_req fsf_req;
 584         struct fsf_qtcb qtcb;
 585 };
 586
 587 /********************** ZFCP SPECIFIC DEFINES ********************************/
 588
 589 #define ZFCP_SET                0x00000100
 590 #define ZFCP_CLEAR              0x00000200
 591
 592 /*
 593  * Helper functions for request ID management.
 594  */
 595 static inline int zfcp_reqlist_hash(unsigned long req_id)
 596 {
 597         return req_id % REQUEST_LIST_SIZE;
 598 }
 599
 600 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 601                                        struct zfcp_fsf_req *fsf_req)
 602 {
 603         list_del(&fsf_req->list);
 604 }
 605
 606 static inline struct zfcp_fsf_req *
 607 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 608 {
 609         struct zfcp_fsf_req *request;
 610         unsigned int idx;
 611
 612         idx = zfcp_reqlist_hash(req_id);
 613         list_for_each_entry(request, &adapter->req_list[idx], list)
 614                 if (request->req_id == req_id)
 615                         return request;
 616         return NULL;
 617 }
 618
 619 static inline struct zfcp_fsf_req *
 620 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 621 {
 622         struct zfcp_fsf_req *request;
 623         unsigned int idx;
 624
 625         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 626                 list_for_each_entry(request, &adapter->req_list[idx], list)
 627                         if (request == req)
 628                                 return request;
 629         }
 630         return NULL;
 631 }
 632
 633 /*
 634  *  functions needed for reference/usage counting
 635  */
 636
 637 static inline void
 638 zfcp_unit_get(struct zfcp_unit *unit)
 639 {
 640         atomic_inc(&unit->refcount);
 641 }
 642
 643 static inline void
 644 zfcp_unit_put(struct zfcp_unit *unit)
 645 {
 646         if (atomic_dec_return(&unit->refcount) == 0)
 647                 wake_up(&unit->remove_wq);
 648 }
 649
 650 static inline void
 651 zfcp_port_get(struct zfcp_port *port)
 652 {
 653         atomic_inc(&port->refcount);
 654 }
 655
 656 static inline void
 657 zfcp_port_put(struct zfcp_port *port)
 658 {
 659         if (atomic_dec_return(&port->refcount) == 0)
 660                 wake_up(&port->remove_wq);
 661 }
 662
 663 static inline void
 664 zfcp_adapter_get(struct zfcp_adapter *adapter)
 665 {
 666         atomic_inc(&adapter->refcount);
 667 }
 668
 669 static inline void
 670 zfcp_adapter_put(struct zfcp_adapter *adapter)
 671 {
 672         if (atomic_dec_return(&adapter->refcount) == 0)
 673                 wake_up(&adapter->remove_wq);
 674 }
 675
 676 #endif /* ZFCP_DEF_H */