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, 2008
   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 /* Adapter Identification Parameters */
  51 #define ZFCP_CONTROL_UNIT_TYPE  0x1731
  52 #define ZFCP_CONTROL_UNIT_MODEL 0x03
  53 #define ZFCP_DEVICE_TYPE        0x1732
  54 #define ZFCP_DEVICE_MODEL       0x03
  55 #define ZFCP_DEVICE_MODEL_PRIV  0x04
  56
  57 /* DMQ bug workaround: don't use last SBALE */
  58 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  59
  60 /* index of last SBALE (with respect to DMQ bug workaround) */
  61 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  62
  63 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  64 #define ZFCP_MAX_SBALES_PER_REQ         \
  65         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  66         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  67
  68 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  69         /* max. number of (data buffer) SBALEs in largest SBAL chain
  70            multiplied with number of sectors per 4k block */
  71
  72 /********************* FSF SPECIFIC DEFINES *********************************/
  73
  74 /* ATTENTION: value must not be used by hardware */
  75 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  76
  77 /* timeout value for "default timer" for fsf requests */
  78 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  79
  80 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
  81
  82 /* timeout for name-server lookup (in seconds) */
  83 #define ZFCP_NS_GID_PN_TIMEOUT          10
  84
  85 /* task attribute values in FCP-2 FCP_CMND IU */
  86 #define SIMPLE_Q        0
  87 #define HEAD_OF_Q       1
  88 #define ORDERED_Q       2
  89 #define ACA_Q           4
  90 #define UNTAGGED        5
  91
  92 /* task management flags in FCP-2 FCP_CMND IU */
  93 #define FCP_CLEAR_ACA           0x40
  94 #define FCP_TARGET_RESET        0x20
  95 #define FCP_LOGICAL_UNIT_RESET  0x10
  96 #define FCP_CLEAR_TASK_SET      0x04
  97 #define FCP_ABORT_TASK_SET      0x02
  98
  99 #define FCP_CDB_LENGTH          16
 100
 101 #define ZFCP_DID_MASK           0x00FFFFFF
 102
 103 /* FCP(-2) FCP_CMND IU */
 104 struct fcp_cmnd_iu {
 105         u64 fcp_lun;       /* FCP logical unit number */
 106         u8  crn;                   /* command reference number */
 107         u8  reserved0:5;           /* reserved */
 108         u8  task_attribute:3;      /* task attribute */
 109         u8  task_management_flags; /* task management flags */
 110         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 111         u8  rddata:1;              /* read data */
 112         u8  wddata:1;              /* write data */
 113         u8  fcp_cdb[FCP_CDB_LENGTH];
 114 } __attribute__((packed));
 115
 116 /* FCP(-2) FCP_RSP IU */
 117 struct fcp_rsp_iu {
 118         u8  reserved0[10];
 119         union {
 120                 struct {
 121                         u8 reserved1:3;
 122                         u8 fcp_conf_req:1;
 123                         u8 fcp_resid_under:1;
 124                         u8 fcp_resid_over:1;
 125                         u8 fcp_sns_len_valid:1;
 126                         u8 fcp_rsp_len_valid:1;
 127                 } bits;
 128                 u8 value;
 129         } validity;
 130         u8  scsi_status;
 131         u32 fcp_resid;
 132         u32 fcp_sns_len;
 133         u32 fcp_rsp_len;
 134 } __attribute__((packed));
 135
 136
 137 #define RSP_CODE_GOOD            0
 138 #define RSP_CODE_LENGTH_MISMATCH 1
 139 #define RSP_CODE_FIELD_INVALID   2
 140 #define RSP_CODE_RO_MISMATCH     3
 141 #define RSP_CODE_TASKMAN_UNSUPP  4
 142 #define RSP_CODE_TASKMAN_FAILED  5
 143
 144 /* see fc-fs */
 145 #define LS_RSCN  0x61
 146 #define LS_LOGO  0x05
 147 #define LS_PLOGI 0x03
 148
 149 struct fcp_rscn_head {
 150         u8  command;
 151         u8  page_length; /* always 0x04 */
 152         u16 payload_len;
 153 } __attribute__((packed));
 154
 155 struct fcp_rscn_element {
 156         u8  reserved:2;
 157         u8  event_qual:4;
 158         u8  addr_format:2;
 159         u32 nport_did:24;
 160 } __attribute__((packed));
 161
 162 /* see fc-ph */
 163 struct fcp_logo {
 164         u32 command;
 165         u32 nport_did;
 166         u64 nport_wwpn;
 167 } __attribute__((packed));
 168
 169 /*
 170  * FC-FS stuff
 171  */
 172 #define R_A_TOV                         10 /* seconds */
 173
 174 #define ZFCP_LS_RLS                     0x0f
 175 #define ZFCP_LS_ADISC                   0x52
 176 #define ZFCP_LS_RPS                     0x56
 177 #define ZFCP_LS_RSCN                    0x61
 178 #define ZFCP_LS_RNID                    0x78
 179
 180 struct zfcp_ls_adisc {
 181         u8              code;
 182         u8              field[3];
 183         u32             hard_nport_id;
 184         u64             wwpn;
 185         u64             wwnn;
 186         u32             nport_id;
 187 } __attribute__ ((packed));
 188
 189 /*
 190  * FC-GS-2 stuff
 191  */
 192 #define ZFCP_CT_REVISION                0x01
 193 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 194 #define ZFCP_CT_NAME_SERVER             0x02
 195 #define ZFCP_CT_SYNCHRONOUS             0x00
 196 #define ZFCP_CT_SCSI_FCP                0x08
 197 #define ZFCP_CT_UNABLE_TO_PERFORM_CMD   0x09
 198 #define ZFCP_CT_GID_PN                  0x0121
 199 #define ZFCP_CT_GPN_FT                  0x0172
 200 #define ZFCP_CT_ACCEPT                  0x8002
 201 #define ZFCP_CT_REJECT                  0x8001
 202
 203 /*
 204  * FC-GS-4 stuff
 205  */
 206 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 207
 208 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 209
 210 /*
 211  * Note, the leftmost status byte is common among adapter, port
 212  * and unit
 213  */
 214 #define ZFCP_COMMON_FLAGS                       0xfff00000
 215
 216 /* common status bits */
 217 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 218 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 219 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 220 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 221 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 222 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 223 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 224 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 225 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
 226
 227 /* adapter status */
 228 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 229 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 230 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 231 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 232 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 233 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 234 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 235
 236 /* FC-PH/FC-GS well-known address identifiers for generic services */
 237 #define ZFCP_DID_WKA                            0xFFFFF0
 238 #define ZFCP_DID_MANAGEMENT_SERVICE             0xFFFFFA
 239 #define ZFCP_DID_TIME_SERVICE                   0xFFFFFB
 240 #define ZFCP_DID_DIRECTORY_SERVICE              0xFFFFFC
 241 #define ZFCP_DID_ALIAS_SERVICE                  0xFFFFF8
 242 #define ZFCP_DID_KEY_DISTRIBUTION_SERVICE       0xFFFFF7
 243
 244 /* remote port status */
 245 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 246 #define ZFCP_STATUS_PORT_PHYS_CLOSING           0x00000004
 247 #define ZFCP_STATUS_PORT_NO_WWPN                0x00000008
 248 #define ZFCP_STATUS_PORT_INVALID_WWPN           0x00000020
 249
 250 /* well known address (WKA) port status*/
 251 enum zfcp_wka_status {
 252         ZFCP_WKA_PORT_OFFLINE,
 253         ZFCP_WKA_PORT_CLOSING,
 254         ZFCP_WKA_PORT_OPENING,
 255         ZFCP_WKA_PORT_ONLINE,
 256 };
 257
 258 /* logical unit status */
 259 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 260 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 261 #define ZFCP_STATUS_UNIT_REGISTERED             0x00000010
 262 #define ZFCP_STATUS_UNIT_SCSI_WORK_PENDING      0x00000020
 263
 264 /* FSF request status (this does not have a common part) */
 265 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 266 #define ZFCP_STATUS_FSFREQ_COMPLETED            0x00000004
 267 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 268 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 269 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 270 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 271 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 272 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 273 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 274 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 275 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 276
 277 /************************* STRUCTURE DEFINITIONS *****************************/
 278
 279 struct zfcp_fsf_req;
 280
 281 /* holds various memory pools of an adapter */
 282 struct zfcp_adapter_mempool {
 283         mempool_t *fsf_req_erp;
 284         mempool_t *fsf_req_scsi;
 285         mempool_t *fsf_req_abort;
 286         mempool_t *fsf_req_status_read;
 287         mempool_t *data_status_read;
 288         mempool_t *data_gid_pn;
 289 };
 290
 291 /*
 292  * header for CT_IU
 293  */
 294 struct ct_hdr {
 295         u8 revision;            // 0x01
 296         u8 in_id[3];            // 0x00
 297         u8 gs_type;             // 0xFC Directory Service
 298         u8 gs_subtype;          // 0x02 Name Server
 299         u8 options;             // 0x00 single bidirectional exchange
 300         u8 reserved0;
 301         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 302         u16 max_res_size;       // <= (4096 - 16) / 4
 303         u8 reserved1;
 304         u8 reason_code;
 305         u8 reason_code_expl;
 306         u8 vendor_unique;
 307 } __attribute__ ((packed));
 308
 309 /* nameserver request CT_IU -- for requests where
 310  * a port name is required */
 311 struct ct_iu_gid_pn_req {
 312         struct ct_hdr header;
 313         u64 wwpn;
 314 } __attribute__ ((packed));
 315
 316 /* FS_ACC IU and data unit for GID_PN nameserver request */
 317 struct ct_iu_gid_pn_resp {
 318         struct ct_hdr header;
 319         u32 d_id;
 320 } __attribute__ ((packed));
 321
 322 /**
 323  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 324  * @wka_port: port where the request is sent to
 325  * @req: scatter-gather list for request
 326  * @resp: scatter-gather list for response
 327  * @handler: handler function (called for response to the request)
 328  * @handler_data: data passed to handler function
 329  * @timeout: FSF timeout for this request
 330  * @completion: completion for synchronization purposes
 331  * @status: used to pass error status to calling function
 332  */
 333 struct zfcp_send_ct {
 334         struct zfcp_wka_port *wka_port;
 335         struct scatterlist *req;
 336         struct scatterlist *resp;
 337         void (*handler)(unsigned long);
 338         unsigned long handler_data;
 339         int timeout;
 340         struct completion *completion;
 341         int status;
 342 };
 343
 344 /* used for name server requests in error recovery */
 345 struct zfcp_gid_pn_data {
 346         struct zfcp_send_ct ct;
 347         struct scatterlist req;
 348         struct scatterlist resp;
 349         struct ct_iu_gid_pn_req ct_iu_req;
 350         struct ct_iu_gid_pn_resp ct_iu_resp;
 351         struct zfcp_port *port;
 352 };
 353
 354 /**
 355  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 356  * @adapter: adapter where request is sent from
 357  * @port: port where ELS is destinated (port reference count has to be increased)
 358  * @d_id: destiniation id of port where request is sent to
 359  * @req: scatter-gather list for request
 360  * @resp: scatter-gather list for response
 361  * @handler: handler function (called for response to the request)
 362  * @handler_data: data passed to handler function
 363  * @completion: completion for synchronization purposes
 364  * @ls_code: hex code of ELS command
 365  * @status: used to pass error status to calling function
 366  */
 367 struct zfcp_send_els {
 368         struct zfcp_adapter *adapter;
 369         struct zfcp_port *port;
 370         u32 d_id;
 371         struct scatterlist *req;
 372         struct scatterlist *resp;
 373         void (*handler)(unsigned long);
 374         unsigned long handler_data;
 375         struct completion *completion;
 376         int ls_code;
 377         int status;
 378 };
 379
 380 struct zfcp_wka_port {
 381         struct zfcp_adapter     *adapter;
 382         wait_queue_head_t       completion_wq;
 383         enum zfcp_wka_status    status;
 384         atomic_t                refcount;
 385         u32                     d_id;
 386         u32                     handle;
 387         struct mutex            mutex;
 388         struct delayed_work     work;
 389 };
 390
 391 struct zfcp_qdio_queue {
 392         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 393         u8                 first;       /* index of next free bfr in queue */
 394         atomic_t           count;       /* number of free buffers in queue */
 395 };
 396
 397 struct zfcp_erp_action {
 398         struct list_head list;
 399         int action;                   /* requested action code */
 400         struct zfcp_adapter *adapter; /* device which should be recovered */
 401         struct zfcp_port *port;
 402         struct zfcp_unit *unit;
 403         u32             status;       /* recovery status */
 404         u32 step;                     /* active step of this erp action */
 405         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 406                                          for this action */
 407         struct timer_list timer;
 408 };
 409
 410 struct fsf_latency_record {
 411         u32 min;
 412         u32 max;
 413         u64 sum;
 414 };
 415
 416 struct latency_cont {
 417         struct fsf_latency_record channel;
 418         struct fsf_latency_record fabric;
 419         u64 counter;
 420 };
 421
 422 struct zfcp_latencies {
 423         struct latency_cont read;
 424         struct latency_cont write;
 425         struct latency_cont cmd;
 426         spinlock_t lock;
 427 };
 428
 429 struct zfcp_adapter {
 430         atomic_t                refcount;          /* reference count */
 431         wait_queue_head_t       remove_wq;         /* can be used to wait for
 432                                                       refcount drop to zero */
 433         u64                     peer_wwnn;         /* P2P peer WWNN */
 434         u64                     peer_wwpn;         /* P2P peer WWPN */
 435         u32                     peer_d_id;         /* P2P peer D_ID */
 436         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 437         u32                     hydra_version;     /* Hydra version */
 438         u32                     fsf_lic_version;
 439         u32                     adapter_features;  /* FCP channel features */
 440         u32                     connection_features; /* host connection features */
 441         u32                     hardware_version;  /* of FCP channel */
 442         u16                     timer_ticks;       /* time int for a tick */
 443         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 444         struct list_head        port_list_head;    /* remote port list */
 445         unsigned long           req_no;            /* unique FSF req number */
 446         struct list_head        *req_list;         /* list of pending reqs */
 447         spinlock_t              req_list_lock;     /* request list lock */
 448         struct zfcp_qdio_queue  req_q;             /* request queue */
 449         spinlock_t              req_q_lock;        /* for operations on queue */
 450         int                     req_q_pci_batch;   /* SBALs since PCI indication
 451                                                       was last set */
 452         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 453         wait_queue_head_t       request_wq;        /* can be used to wait for
 454                                                       more avaliable SBALs */
 455         struct zfcp_qdio_queue  resp_q;    /* response queue */
 456         rwlock_t                abort_lock;        /* Protects against SCSI
 457                                                       stack abort/command
 458                                                       completion races */
 459         atomic_t                stat_miss;         /* # missing status reads*/
 460         struct work_struct      stat_work;
 461         atomic_t                status;            /* status of this adapter */
 462         struct list_head        erp_ready_head;    /* error recovery for this
 463                                                       adapter/devices */
 464         struct list_head        erp_running_head;
 465         rwlock_t                erp_lock;
 466         struct semaphore        erp_ready_sem;
 467         wait_queue_head_t       erp_thread_wqh;
 468         wait_queue_head_t       erp_done_wqh;
 469         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 470         atomic_t                erp_counter;
 471         u32                     erp_total_count;   /* total nr of enqueued erp
 472                                                       actions */
 473         u32                     erp_low_mem_count; /* nr of erp actions waiting
 474                                                       for memory */
 475         struct zfcp_wka_port    nsp;               /* adapter's nameserver */
 476         debug_info_t            *rec_dbf;
 477         debug_info_t            *hba_dbf;
 478         debug_info_t            *san_dbf;          /* debug feature areas */
 479         debug_info_t            *scsi_dbf;
 480         spinlock_t              rec_dbf_lock;
 481         spinlock_t              hba_dbf_lock;
 482         spinlock_t              san_dbf_lock;
 483         spinlock_t              scsi_dbf_lock;
 484         struct zfcp_rec_dbf_record      rec_dbf_buf;
 485         struct zfcp_hba_dbf_record      hba_dbf_buf;
 486         struct zfcp_san_dbf_record      san_dbf_buf;
 487         struct zfcp_scsi_dbf_record     scsi_dbf_buf;
 488         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 489         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 490         struct fc_host_statistics *fc_stats;
 491         struct fsf_qtcb_bottom_port *stats_reset_data;
 492         unsigned long           stats_reset;
 493         struct work_struct      scan_work;
 494         struct service_level    service_level;
 495         atomic_t                qdio_outb_full;    /* queue full incidents */
 496 };
 497
 498 struct zfcp_port {
 499         struct device          sysfs_device;   /* sysfs device */
 500         struct fc_rport        *rport;         /* rport of fc transport class */
 501         struct list_head       list;           /* list of remote ports */
 502         atomic_t               refcount;       /* reference count */
 503         wait_queue_head_t      remove_wq;      /* can be used to wait for
 504                                                   refcount drop to zero */
 505         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 506         struct list_head       unit_list_head; /* head of logical unit list */
 507         atomic_t               status;         /* status of this remote port */
 508         u64                    wwnn;           /* WWNN if known */
 509         u64                    wwpn;           /* WWPN */
 510         u32                    d_id;           /* D_ID */
 511         u32                    handle;         /* handle assigned by FSF */
 512         struct zfcp_erp_action erp_action;     /* pending error recovery */
 513         atomic_t               erp_counter;
 514         u32                    maxframe_size;
 515         u32                    supported_classes;
 516         struct work_struct     gid_pn_work;
 517 };
 518
 519 struct zfcp_unit {
 520         struct device          sysfs_device;   /* sysfs device */
 521         struct list_head       list;           /* list of logical units */
 522         atomic_t               refcount;       /* reference count */
 523         wait_queue_head_t      remove_wq;      /* can be used to wait for
 524                                                   refcount drop to zero */
 525         struct zfcp_port       *port;          /* remote port of unit */
 526         atomic_t               status;         /* status of this logical unit */
 527         u64                    fcp_lun;        /* own FCP_LUN */
 528         u32                    handle;         /* handle assigned by FSF */
 529         struct scsi_device     *device;        /* scsi device struct pointer */
 530         struct zfcp_erp_action erp_action;     /* pending error recovery */
 531         atomic_t               erp_counter;
 532         struct zfcp_latencies   latencies;
 533 };
 534
 535 /* FSF request */
 536 struct zfcp_fsf_req {
 537         struct list_head       list;           /* list of FSF requests */
 538         unsigned long          req_id;         /* unique request ID */
 539         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 540         u8                     sbal_number;    /* nr of SBALs free for use */
 541         u8                     sbal_first;     /* first SBAL for this request */
 542         u8                     sbal_last;      /* last SBAL for this request */
 543         u8                     sbal_limit;      /* last possible SBAL for
 544                                                   this reuest */
 545         u8                     sbale_curr;     /* current SBALE during creation
 546                                                   of request */
 547         u8                      sbal_response;  /* SBAL used in interrupt */
 548         wait_queue_head_t      completion_wq;  /* can be used by a routine
 549                                                   to wait for completion */
 550         u32                     status;        /* status of this request */
 551         u32                    fsf_command;    /* FSF Command copy */
 552         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
 553         u32                    seq_no;         /* Sequence number of request */
 554         void                    *data;           /* private data of request */
 555         struct timer_list     timer;           /* used for erp or scsi er */
 556         struct zfcp_erp_action *erp_action;    /* used if this request is
 557                                                   issued on behalf of erp */
 558         mempool_t              *pool;          /* used if request was alloacted
 559                                                   from emergency pool */
 560         unsigned long long     issued;         /* request sent time (STCK) */
 561         struct zfcp_unit       *unit;
 562         void                    (*handler)(struct zfcp_fsf_req *);
 563         u16                     qdio_outb_usage;/* usage of outbound queue */
 564         u16                     qdio_inb_usage; /* usage of inbound queue */
 565 };
 566
 567 /* driver data */
 568 struct zfcp_data {
 569         struct scsi_host_template scsi_host_template;
 570         struct scsi_transport_template *scsi_transport_template;
 571         rwlock_t                config_lock;        /* serialises changes
 572                                                        to adapter/port/unit
 573                                                        lists */
 574         struct semaphore        config_sema;        /* serialises configuration
 575                                                        changes */
 576         struct kmem_cache       *fsf_req_qtcb_cache;
 577         struct kmem_cache       *sr_buffer_cache;
 578         struct kmem_cache       *gid_pn_cache;
 579         struct workqueue_struct *work_queue;
 580 };
 581
 582 /* struct used by memory pools for fsf_requests */
 583 struct zfcp_fsf_req_qtcb {
 584         struct zfcp_fsf_req fsf_req;
 585         struct fsf_qtcb qtcb;
 586 };
 587
 588 /********************** ZFCP SPECIFIC DEFINES ********************************/
 589
 590 #define ZFCP_REQ_AUTO_CLEANUP   0x00000002
 591 #define ZFCP_REQ_NO_QTCB        0x00000008
 592
 593 #define ZFCP_SET                0x00000100
 594 #define ZFCP_CLEAR              0x00000200
 595
 596 /*
 597  * Helper functions for request ID management.
 598  */
 599 static inline int zfcp_reqlist_hash(unsigned long req_id)
 600 {
 601         return req_id % REQUEST_LIST_SIZE;
 602 }
 603
 604 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 605                                        struct zfcp_fsf_req *fsf_req)
 606 {
 607         list_del(&fsf_req->list);
 608 }
 609
 610 static inline struct zfcp_fsf_req *
 611 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 612 {
 613         struct zfcp_fsf_req *request;
 614         unsigned int idx;
 615
 616         idx = zfcp_reqlist_hash(req_id);
 617         list_for_each_entry(request, &adapter->req_list[idx], list)
 618                 if (request->req_id == req_id)
 619                         return request;
 620         return NULL;
 621 }
 622
 623 static inline struct zfcp_fsf_req *
 624 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 625 {
 626         struct zfcp_fsf_req *request;
 627         unsigned int idx;
 628
 629         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 630                 list_for_each_entry(request, &adapter->req_list[idx], list)
 631                         if (request == req)
 632                                 return request;
 633         }
 634         return NULL;
 635 }
 636
 637 /*
 638  *  functions needed for reference/usage counting
 639  */
 640
 641 static inline void
 642 zfcp_unit_get(struct zfcp_unit *unit)
 643 {
 644         atomic_inc(&unit->refcount);
 645 }
 646
 647 static inline void
 648 zfcp_unit_put(struct zfcp_unit *unit)
 649 {
 650         if (atomic_dec_return(&unit->refcount) == 0)
 651                 wake_up(&unit->remove_wq);
 652 }
 653
 654 static inline void
 655 zfcp_port_get(struct zfcp_port *port)
 656 {
 657         atomic_inc(&port->refcount);
 658 }
 659
 660 static inline void
 661 zfcp_port_put(struct zfcp_port *port)
 662 {
 663         if (atomic_dec_return(&port->refcount) == 0)
 664                 wake_up(&port->remove_wq);
 665 }
 666
 667 static inline void
 668 zfcp_adapter_get(struct zfcp_adapter *adapter)
 669 {
 670         atomic_inc(&adapter->refcount);
 671 }
 672
 673 static inline void
 674 zfcp_adapter_put(struct zfcp_adapter *adapter)
 675 {
 676         if (atomic_dec_return(&adapter->refcount) == 0)
 677                 wake_up(&adapter->remove_wq);
 678 }
 679
 680 #endif /* ZFCP_DEF_H */