git.oblomov.eu Git - linux-2.6/blob - 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/scsi.h>
  26 #include <scsi/scsi_tcq.h>
  27 #include <scsi/scsi_cmnd.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_transport.h>
  31 #include <scsi/scsi_transport_fc.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/qdio.h>
  34 #include <asm/debug.h>
  35 #include <asm/ebcdic.h>
  36 #include <asm/sysinfo.h>
  37 #include "zfcp_dbf.h"
  38 #include "zfcp_fsf.h"
  39
  40
  41 /********************* GENERAL DEFINES *********************************/
  42
  43 #define REQUEST_LIST_SIZE 128
  44
  45 /********************* SCSI SPECIFIC DEFINES *********************************/
  46 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  47
  48 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  49
  50 /* DMQ bug workaround: don't use last SBALE */
  51 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  52
  53 /* index of last SBALE (with respect to DMQ bug workaround) */
  54 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  55
  56 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  57 #define ZFCP_MAX_SBALES_PER_REQ         \
  58         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  59         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  60
  61 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  62         /* max. number of (data buffer) SBALEs in largest SBAL chain
  63            multiplied with number of sectors per 4k block */
  64
  65 /********************* FSF SPECIFIC DEFINES *********************************/
  66
  67 /* ATTENTION: value must not be used by hardware */
  68 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  69
  70 /* timeout value for "default timer" for fsf requests */
  71 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  72
  73 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
  74
  75 /* timeout for name-server lookup (in seconds) */
  76 #define ZFCP_NS_GID_PN_TIMEOUT          10
  77
  78 /* task attribute values in FCP-2 FCP_CMND IU */
  79 #define SIMPLE_Q        0
  80 #define HEAD_OF_Q       1
  81 #define ORDERED_Q       2
  82 #define ACA_Q           4
  83 #define UNTAGGED        5
  84
  85 /* task management flags in FCP-2 FCP_CMND IU */
  86 #define FCP_CLEAR_ACA           0x40
  87 #define FCP_TARGET_RESET        0x20
  88 #define FCP_LOGICAL_UNIT_RESET  0x10
  89 #define FCP_CLEAR_TASK_SET      0x04
  90 #define FCP_ABORT_TASK_SET      0x02
  91
  92 #define FCP_CDB_LENGTH          16
  93
  94 #define ZFCP_DID_MASK           0x00FFFFFF
  95
  96 /* FCP(-2) FCP_CMND IU */
  97 struct fcp_cmnd_iu {
  98         u64 fcp_lun;       /* FCP logical unit number */
  99         u8  crn;                   /* command reference number */
 100         u8  reserved0:5;           /* reserved */
 101         u8  task_attribute:3;      /* task attribute */
 102         u8  task_management_flags; /* task management flags */
 103         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 104         u8  rddata:1;              /* read data */
 105         u8  wddata:1;              /* write data */
 106         u8  fcp_cdb[FCP_CDB_LENGTH];
 107 } __attribute__((packed));
 108
 109 /* FCP(-2) FCP_RSP IU */
 110 struct fcp_rsp_iu {
 111         u8  reserved0[10];
 112         union {
 113                 struct {
 114                         u8 reserved1:3;
 115                         u8 fcp_conf_req:1;
 116                         u8 fcp_resid_under:1;
 117                         u8 fcp_resid_over:1;
 118                         u8 fcp_sns_len_valid:1;
 119                         u8 fcp_rsp_len_valid:1;
 120                 } bits;
 121                 u8 value;
 122         } validity;
 123         u8  scsi_status;
 124         u32 fcp_resid;
 125         u32 fcp_sns_len;
 126         u32 fcp_rsp_len;
 127 } __attribute__((packed));
 128
 129
 130 #define RSP_CODE_GOOD            0
 131 #define RSP_CODE_LENGTH_MISMATCH 1
 132 #define RSP_CODE_FIELD_INVALID   2
 133 #define RSP_CODE_RO_MISMATCH     3
 134 #define RSP_CODE_TASKMAN_UNSUPP  4
 135 #define RSP_CODE_TASKMAN_FAILED  5
 136
 137 /* see fc-fs */
 138 #define LS_RSCN  0x61
 139 #define LS_LOGO  0x05
 140 #define LS_PLOGI 0x03
 141
 142 struct fcp_rscn_head {
 143         u8  command;
 144         u8  page_length; /* always 0x04 */
 145         u16 payload_len;
 146 } __attribute__((packed));
 147
 148 struct fcp_rscn_element {
 149         u8  reserved:2;
 150         u8  event_qual:4;
 151         u8  addr_format:2;
 152         u32 nport_did:24;
 153 } __attribute__((packed));
 154
 155 /* see fc-ph */
 156 struct fcp_logo {
 157         u32 command;
 158         u32 nport_did;
 159         u64 nport_wwpn;
 160 } __attribute__((packed));
 161
 162 /*
 163  * FC-FS stuff
 164  */
 165 #define R_A_TOV                         10 /* seconds */
 166
 167 #define ZFCP_LS_RLS                     0x0f
 168 #define ZFCP_LS_ADISC                   0x52
 169 #define ZFCP_LS_RPS                     0x56
 170 #define ZFCP_LS_RSCN                    0x61
 171 #define ZFCP_LS_RNID                    0x78
 172
 173 struct zfcp_ls_adisc {
 174         u8              code;
 175         u8              field[3];
 176         u32             hard_nport_id;
 177         u64             wwpn;
 178         u64             wwnn;
 179         u32             nport_id;
 180 } __attribute__ ((packed));
 181
 182 /*
 183  * FC-GS-2 stuff
 184  */
 185 #define ZFCP_CT_REVISION                0x01
 186 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 187 #define ZFCP_CT_NAME_SERVER             0x02
 188 #define ZFCP_CT_SYNCHRONOUS             0x00
 189 #define ZFCP_CT_SCSI_FCP                0x08
 190 #define ZFCP_CT_UNABLE_TO_PERFORM_CMD   0x09
 191 #define ZFCP_CT_GID_PN                  0x0121
 192 #define ZFCP_CT_GPN_FT                  0x0172
 193 #define ZFCP_CT_ACCEPT                  0x8002
 194 #define ZFCP_CT_REJECT                  0x8001
 195
 196 /*
 197  * FC-GS-4 stuff
 198  */
 199 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 200
 201 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 202
 203 /*
 204  * Note, the leftmost status byte is common among adapter, port
 205  * and unit
 206  */
 207 #define ZFCP_COMMON_FLAGS                       0xfff00000
 208
 209 /* common status bits */
 210 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 211 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 212 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 213 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 214 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 215 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 216 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 217 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 218 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
 219
 220 /* adapter status */
 221 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 222 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 223 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 224 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 225 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 226 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 227 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 228
 229 /* FC-PH/FC-GS well-known address identifiers for generic services */
 230 #define ZFCP_DID_WKA                            0xFFFFF0
 231 #define ZFCP_DID_MANAGEMENT_SERVICE             0xFFFFFA
 232 #define ZFCP_DID_TIME_SERVICE                   0xFFFFFB
 233 #define ZFCP_DID_DIRECTORY_SERVICE              0xFFFFFC
 234 #define ZFCP_DID_ALIAS_SERVICE                  0xFFFFF8
 235 #define ZFCP_DID_KEY_DISTRIBUTION_SERVICE       0xFFFFF7
 236
 237 /* remote port status */
 238 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 239
 240 /* well known address (WKA) port status*/
 241 enum zfcp_wka_status {
 242         ZFCP_WKA_PORT_OFFLINE,
 243         ZFCP_WKA_PORT_CLOSING,
 244         ZFCP_WKA_PORT_OPENING,
 245         ZFCP_WKA_PORT_ONLINE,
 246 };
 247
 248 /* logical unit status */
 249 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 250 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 251
 252 /* FSF request status (this does not have a common part) */
 253 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 254 #define ZFCP_STATUS_FSFREQ_COMPLETED            0x00000004
 255 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 256 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 257 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 258 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 259 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 260 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 261 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 262 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 263 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 264
 265 /************************* STRUCTURE DEFINITIONS *****************************/
 266
 267 struct zfcp_fsf_req;
 268
 269 /* holds various memory pools of an adapter */
 270 struct zfcp_adapter_mempool {
 271         mempool_t *fsf_req_erp;
 272         mempool_t *fsf_req_scsi;
 273         mempool_t *fsf_req_abort;
 274         mempool_t *fsf_req_status_read;
 275         mempool_t *data_status_read;
 276         mempool_t *data_gid_pn;
 277 };
 278
 279 /*
 280  * header for CT_IU
 281  */
 282 struct ct_hdr {
 283         u8 revision;            // 0x01
 284         u8 in_id[3];            // 0x00
 285         u8 gs_type;             // 0xFC Directory Service
 286         u8 gs_subtype;          // 0x02 Name Server
 287         u8 options;             // 0x00 single bidirectional exchange
 288         u8 reserved0;
 289         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 290         u16 max_res_size;       // <= (4096 - 16) / 4
 291         u8 reserved1;
 292         u8 reason_code;
 293         u8 reason_code_expl;
 294         u8 vendor_unique;
 295 } __attribute__ ((packed));
 296
 297 /* nameserver request CT_IU -- for requests where
 298  * a port name is required */
 299 struct ct_iu_gid_pn_req {
 300         struct ct_hdr header;
 301         u64 wwpn;
 302 } __attribute__ ((packed));
 303
 304 /* FS_ACC IU and data unit for GID_PN nameserver request */
 305 struct ct_iu_gid_pn_resp {
 306         struct ct_hdr header;
 307         u32 d_id;
 308 } __attribute__ ((packed));
 309
 310 /**
 311  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 312  * @wka_port: port where the request is sent to
 313  * @req: scatter-gather list for request
 314  * @resp: scatter-gather list for response
 315  * @handler: handler function (called for response to the request)
 316  * @handler_data: data passed to handler function
 317  * @timeout: FSF timeout for this request
 318  * @completion: completion for synchronization purposes
 319  * @status: used to pass error status to calling function
 320  */
 321 struct zfcp_send_ct {
 322         struct zfcp_wka_port *wka_port;
 323         struct scatterlist *req;
 324         struct scatterlist *resp;
 325         void (*handler)(unsigned long);
 326         unsigned long handler_data;
 327         int timeout;
 328         struct completion *completion;
 329         int status;
 330 };
 331
 332 /* used for name server requests in error recovery */
 333 struct zfcp_gid_pn_data {
 334         struct zfcp_send_ct ct;
 335         struct scatterlist req;
 336         struct scatterlist resp;
 337         struct ct_iu_gid_pn_req ct_iu_req;
 338         struct ct_iu_gid_pn_resp ct_iu_resp;
 339         struct zfcp_port *port;
 340 };
 341
 342 /**
 343  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 344  * @adapter: adapter where request is sent from
 345  * @port: port where ELS is destinated (port reference count has to be increased)
 346  * @d_id: destiniation id of port where request is sent to
 347  * @req: scatter-gather list for request
 348  * @resp: scatter-gather list for response
 349  * @handler: handler function (called for response to the request)
 350  * @handler_data: data passed to handler function
 351  * @completion: completion for synchronization purposes
 352  * @ls_code: hex code of ELS command
 353  * @status: used to pass error status to calling function
 354  */
 355 struct zfcp_send_els {
 356         struct zfcp_adapter *adapter;
 357         struct zfcp_port *port;
 358         u32 d_id;
 359         struct scatterlist *req;
 360         struct scatterlist *resp;
 361         void (*handler)(unsigned long);
 362         unsigned long handler_data;
 363         struct completion *completion;
 364         int ls_code;
 365         int status;
 366 };
 367
 368 struct zfcp_wka_port {
 369         struct zfcp_adapter     *adapter;
 370         wait_queue_head_t       completion_wq;
 371         enum zfcp_wka_status    status;
 372         atomic_t                refcount;
 373         u32                     d_id;
 374         u32                     handle;
 375         struct mutex            mutex;
 376         struct delayed_work     work;
 377 };
 378
 379 struct zfcp_qdio_queue {
 380         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 381         u8                 first;       /* index of next free bfr in queue */
 382         atomic_t           count;       /* number of free buffers in queue */
 383 };
 384
 385 struct zfcp_erp_action {
 386         struct list_head list;
 387         int action;                   /* requested action code */
 388         struct zfcp_adapter *adapter; /* device which should be recovered */
 389         struct zfcp_port *port;
 390         struct zfcp_unit *unit;
 391         u32             status;       /* recovery status */
 392         u32 step;                     /* active step of this erp action */
 393         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 394                                          for this action */
 395         struct timer_list timer;
 396 };
 397
 398 struct fsf_latency_record {
 399         u32 min;
 400         u32 max;
 401         u64 sum;
 402 };
 403
 404 struct latency_cont {
 405         struct fsf_latency_record channel;
 406         struct fsf_latency_record fabric;
 407         u64 counter;
 408 };
 409
 410 struct zfcp_latencies {
 411         struct latency_cont read;
 412         struct latency_cont write;
 413         struct latency_cont cmd;
 414         spinlock_t lock;
 415 };
 416
 417 struct zfcp_adapter {
 418         atomic_t                refcount;          /* reference count */
 419         wait_queue_head_t       remove_wq;         /* can be used to wait for
 420                                                       refcount drop to zero */
 421         u64                     peer_wwnn;         /* P2P peer WWNN */
 422         u64                     peer_wwpn;         /* P2P peer WWPN */
 423         u32                     peer_d_id;         /* P2P peer D_ID */
 424         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 425         u32                     hydra_version;     /* Hydra version */
 426         u32                     fsf_lic_version;
 427         u32                     adapter_features;  /* FCP channel features */
 428         u32                     connection_features; /* host connection features */
 429         u32                     hardware_version;  /* of FCP channel */
 430         u16                     timer_ticks;       /* time int for a tick */
 431         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 432         struct list_head        port_list_head;    /* remote port list */
 433         unsigned long           req_no;            /* unique FSF req number */
 434         struct list_head        *req_list;         /* list of pending reqs */
 435         spinlock_t              req_list_lock;     /* request list lock */
 436         struct zfcp_qdio_queue  req_q;             /* request queue */
 437         spinlock_t              req_q_lock;        /* for operations on queue */
 438         ktime_t                 req_q_time; /* time of last fill level change */
 439         u64                     req_q_util; /* for accounting */
 440         spinlock_t              qdio_stat_lock;
 441         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 442         wait_queue_head_t       request_wq;        /* can be used to wait for
 443                                                       more avaliable SBALs */
 444         struct zfcp_qdio_queue  resp_q;    /* response queue */
 445         rwlock_t                abort_lock;        /* Protects against SCSI
 446                                                       stack abort/command
 447                                                       completion races */
 448         atomic_t                stat_miss;         /* # missing status reads*/
 449         struct work_struct      stat_work;
 450         atomic_t                status;            /* status of this adapter */
 451         struct list_head        erp_ready_head;    /* error recovery for this
 452                                                       adapter/devices */
 453         struct list_head        erp_running_head;
 454         rwlock_t                erp_lock;
 455         struct semaphore        erp_ready_sem;
 456         wait_queue_head_t       erp_thread_wqh;
 457         wait_queue_head_t       erp_done_wqh;
 458         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 459         atomic_t                erp_counter;
 460         u32                     erp_total_count;   /* total nr of enqueued erp
 461                                                       actions */
 462         u32                     erp_low_mem_count; /* nr of erp actions waiting
 463                                                       for memory */
 464         struct zfcp_wka_port    nsp;               /* adapter's nameserver */
 465         debug_info_t            *rec_dbf;
 466         debug_info_t            *hba_dbf;
 467         debug_info_t            *san_dbf;          /* debug feature areas */
 468         debug_info_t            *scsi_dbf;
 469         spinlock_t              rec_dbf_lock;
 470         spinlock_t              hba_dbf_lock;
 471         spinlock_t              san_dbf_lock;
 472         spinlock_t              scsi_dbf_lock;
 473         struct zfcp_rec_dbf_record      rec_dbf_buf;
 474         struct zfcp_hba_dbf_record      hba_dbf_buf;
 475         struct zfcp_san_dbf_record      san_dbf_buf;
 476         struct zfcp_scsi_dbf_record     scsi_dbf_buf;
 477         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 478         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 479         struct fc_host_statistics *fc_stats;
 480         struct fsf_qtcb_bottom_port *stats_reset_data;
 481         unsigned long           stats_reset;
 482         struct work_struct      scan_work;
 483         struct service_level    service_level;
 484         atomic_t                qdio_outb_full;    /* queue full incidents */
 485 };
 486
 487 struct zfcp_port {
 488         struct device          sysfs_device;   /* sysfs device */
 489         struct fc_rport        *rport;         /* rport of fc transport class */
 490         struct list_head       list;           /* list of remote ports */
 491         atomic_t               refcount;       /* reference count */
 492         wait_queue_head_t      remove_wq;      /* can be used to wait for
 493                                                   refcount drop to zero */
 494         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 495         struct list_head       unit_list_head; /* head of logical unit list */
 496         atomic_t               status;         /* status of this remote port */
 497         u64                    wwnn;           /* WWNN if known */
 498         u64                    wwpn;           /* WWPN */
 499         u32                    d_id;           /* D_ID */
 500         u32                    handle;         /* handle assigned by FSF */
 501         struct zfcp_erp_action erp_action;     /* pending error recovery */
 502         atomic_t               erp_counter;
 503         u32                    maxframe_size;
 504         u32                    supported_classes;
 505         struct work_struct     gid_pn_work;
 506         struct work_struct     test_link_work;
 507         struct work_struct     rport_work;
 508         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 509 };
 510
 511 struct zfcp_unit {
 512         struct device          sysfs_device;   /* sysfs device */
 513         struct list_head       list;           /* list of logical units */
 514         atomic_t               refcount;       /* reference count */
 515         wait_queue_head_t      remove_wq;      /* can be used to wait for
 516                                                   refcount drop to zero */
 517         struct zfcp_port       *port;          /* remote port of unit */
 518         atomic_t               status;         /* status of this logical unit */
 519         u64                    fcp_lun;        /* own FCP_LUN */
 520         u32                    handle;         /* handle assigned by FSF */
 521         struct scsi_device     *device;        /* scsi device struct pointer */
 522         struct zfcp_erp_action erp_action;     /* pending error recovery */
 523         atomic_t               erp_counter;
 524         struct zfcp_latencies   latencies;
 525         struct work_struct      scsi_work;
 526 };
 527
 528 /* FSF request */
 529 struct zfcp_fsf_req {
 530         struct list_head       list;           /* list of FSF requests */
 531         unsigned long          req_id;         /* unique request ID */
 532         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 533         u8                     sbal_number;    /* nr of SBALs free for use */
 534         u8                     sbal_first;     /* first SBAL for this request */
 535         u8                     sbal_last;      /* last SBAL for this request */
 536         u8                     sbal_limit;      /* last possible SBAL for
 537                                                   this reuest */
 538         u8                     sbale_curr;     /* current SBALE during creation
 539                                                   of request */
 540         u8                      sbal_response;  /* SBAL used in interrupt */
 541         wait_queue_head_t      completion_wq;  /* can be used by a routine
 542                                                   to wait for completion */
 543         u32                     status;        /* status of this request */
 544         u32                    fsf_command;    /* FSF Command copy */
 545         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
 546         u32                    seq_no;         /* Sequence number of request */
 547         void                    *data;           /* private data of request */
 548         struct timer_list     timer;           /* used for erp or scsi er */
 549         struct zfcp_erp_action *erp_action;    /* used if this request is
 550                                                   issued on behalf of erp */
 551         mempool_t              *pool;          /* used if request was alloacted
 552                                                   from emergency pool */
 553         unsigned long long     issued;         /* request sent time (STCK) */
 554         struct zfcp_unit       *unit;
 555         void                    (*handler)(struct zfcp_fsf_req *);
 556         u16                     qdio_outb_usage;/* usage of outbound queue */
 557         u16                     qdio_inb_usage; /* usage of inbound queue */
 558 };
 559
 560 /* driver data */
 561 struct zfcp_data {
 562         struct scsi_host_template scsi_host_template;
 563         struct scsi_transport_template *scsi_transport_template;
 564         rwlock_t                config_lock;        /* serialises changes
 565                                                        to adapter/port/unit
 566                                                        lists */
 567         struct semaphore        config_sema;        /* serialises configuration
 568                                                        changes */
 569         struct kmem_cache       *fsf_req_qtcb_cache;
 570         struct kmem_cache       *sr_buffer_cache;
 571         struct kmem_cache       *gid_pn_cache;
 572         struct workqueue_struct *work_queue;
 573 };
 574
 575 /* struct used by memory pools for fsf_requests */
 576 struct zfcp_fsf_req_qtcb {
 577         struct zfcp_fsf_req fsf_req;
 578         struct fsf_qtcb qtcb;
 579 };
 580
 581 /********************** ZFCP SPECIFIC DEFINES ********************************/
 582
 583 #define ZFCP_SET                0x00000100
 584 #define ZFCP_CLEAR              0x00000200
 585
 586 /*
 587  * Helper functions for request ID management.
 588  */
 589 static inline int zfcp_reqlist_hash(unsigned long req_id)
 590 {
 591         return req_id % REQUEST_LIST_SIZE;
 592 }
 593
 594 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 595                                        struct zfcp_fsf_req *fsf_req)
 596 {
 597         list_del(&fsf_req->list);
 598 }
 599
 600 static inline struct zfcp_fsf_req *
 601 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 602 {
 603         struct zfcp_fsf_req *request;
 604         unsigned int idx;
 605
 606         idx = zfcp_reqlist_hash(req_id);
 607         list_for_each_entry(request, &adapter->req_list[idx], list)
 608                 if (request->req_id == req_id)
 609                         return request;
 610         return NULL;
 611 }
 612
 613 static inline struct zfcp_fsf_req *
 614 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 615 {
 616         struct zfcp_fsf_req *request;
 617         unsigned int idx;
 618
 619         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 620                 list_for_each_entry(request, &adapter->req_list[idx], list)
 621                         if (request == req)
 622                                 return request;
 623         }
 624         return NULL;
 625 }
 626
 627 /*
 628  *  functions needed for reference/usage counting
 629  */
 630
 631 static inline void
 632 zfcp_unit_get(struct zfcp_unit *unit)
 633 {
 634         atomic_inc(&unit->refcount);
 635 }
 636
 637 static inline void
 638 zfcp_unit_put(struct zfcp_unit *unit)
 639 {
 640         if (atomic_dec_return(&unit->refcount) == 0)
 641                 wake_up(&unit->remove_wq);
 642 }
 643
 644 static inline void
 645 zfcp_port_get(struct zfcp_port *port)
 646 {
 647         atomic_inc(&port->refcount);
 648 }
 649
 650 static inline void
 651 zfcp_port_put(struct zfcp_port *port)
 652 {
 653         if (atomic_dec_return(&port->refcount) == 0)
 654                 wake_up(&port->remove_wq);
 655 }
 656
 657 static inline void
 658 zfcp_adapter_get(struct zfcp_adapter *adapter)
 659 {
 660         atomic_inc(&adapter->refcount);
 661 }
 662
 663 static inline void
 664 zfcp_adapter_put(struct zfcp_adapter *adapter)
 665 {
 666         if (atomic_dec_return(&adapter->refcount) == 0)
 667                 wake_up(&adapter->remove_wq);
 668 }
 669
 670 #endif /* ZFCP_DEF_H */