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_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 *gid_pn_req;
 269         mempool_t *scsi_req;
 270         mempool_t *scsi_abort;
 271         mempool_t *status_read_req;
 272         mempool_t *status_read_data;
 273         mempool_t *gid_pn_data;
 274         mempool_t *qtcb_pool;
 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 struct ct_iu_gpn_ft_req {
 309         struct ct_hdr header;
 310         u8 flags;
 311         u8 domain_id_scope;
 312         u8 area_id_scope;
 313         u8 fc4_type;
 314 } __attribute__ ((packed));
 315
 316
 317 /**
 318  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 319  * @wka_port: port where the request is sent to
 320  * @req: scatter-gather list for request
 321  * @resp: scatter-gather list for response
 322  * @handler: handler function (called for response to the request)
 323  * @handler_data: data passed to handler function
 324  * @timeout: FSF timeout for this request
 325  * @completion: completion for synchronization purposes
 326  * @status: used to pass error status to calling function
 327  */
 328 struct zfcp_send_ct {
 329         struct zfcp_wka_port *wka_port;
 330         struct scatterlist *req;
 331         struct scatterlist *resp;
 332         void (*handler)(unsigned long);
 333         unsigned long handler_data;
 334         int timeout;
 335         struct completion *completion;
 336         int status;
 337 };
 338
 339 /* used for name server requests in error recovery */
 340 struct zfcp_gid_pn_data {
 341         struct zfcp_send_ct ct;
 342         struct scatterlist req;
 343         struct scatterlist resp;
 344         struct ct_iu_gid_pn_req ct_iu_req;
 345         struct ct_iu_gid_pn_resp ct_iu_resp;
 346         struct zfcp_port *port;
 347 };
 348
 349 /**
 350  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 351  * @adapter: adapter where request is sent from
 352  * @port: port where ELS is destinated (port reference count has to be increased)
 353  * @d_id: destiniation id of port where request is sent to
 354  * @req: scatter-gather list for request
 355  * @resp: scatter-gather list for response
 356  * @handler: handler function (called for response to the request)
 357  * @handler_data: data passed to handler function
 358  * @completion: completion for synchronization purposes
 359  * @ls_code: hex code of ELS command
 360  * @status: used to pass error status to calling function
 361  */
 362 struct zfcp_send_els {
 363         struct zfcp_adapter *adapter;
 364         struct zfcp_port *port;
 365         u32 d_id;
 366         struct scatterlist *req;
 367         struct scatterlist *resp;
 368         void (*handler)(unsigned long);
 369         unsigned long handler_data;
 370         struct completion *completion;
 371         int ls_code;
 372         int status;
 373 };
 374
 375 struct zfcp_wka_port {
 376         struct zfcp_adapter     *adapter;
 377         wait_queue_head_t       completion_wq;
 378         enum zfcp_wka_status    status;
 379         atomic_t                refcount;
 380         u32                     d_id;
 381         u32                     handle;
 382         struct mutex            mutex;
 383         struct delayed_work     work;
 384 };
 385
 386 struct zfcp_wka_ports {
 387         struct zfcp_wka_port ms;        /* management service */
 388         struct zfcp_wka_port ts;        /* time service */
 389         struct zfcp_wka_port ds;        /* directory service */
 390         struct zfcp_wka_port as;        /* alias service */
 391         struct zfcp_wka_port ks;        /* key distribution service */
 392 };
 393
 394 struct zfcp_qdio_queue {
 395         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 396         u8                 first;       /* index of next free bfr in queue */
 397         atomic_t           count;       /* number of free buffers in queue */
 398 };
 399
 400 struct zfcp_erp_action {
 401         struct list_head list;
 402         int action;                   /* requested action code */
 403         struct zfcp_adapter *adapter; /* device which should be recovered */
 404         struct zfcp_port *port;
 405         struct zfcp_unit *unit;
 406         u32             status;       /* recovery status */
 407         u32 step;                     /* active step of this erp action */
 408         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 409                                          for this action */
 410         struct timer_list timer;
 411 };
 412
 413 struct fsf_latency_record {
 414         u32 min;
 415         u32 max;
 416         u64 sum;
 417 };
 418
 419 struct latency_cont {
 420         struct fsf_latency_record channel;
 421         struct fsf_latency_record fabric;
 422         u64 counter;
 423 };
 424
 425 struct zfcp_latencies {
 426         struct latency_cont read;
 427         struct latency_cont write;
 428         struct latency_cont cmd;
 429         spinlock_t lock;
 430 };
 431
 432 /** struct zfcp_qdio - basic QDIO data structure
 433  * @resp_q: response queue
 434  * @req_q: request queue
 435  * @stat_lock: lock to protect req_q_util and req_q_time
 436  * @req_q_lock; lock to serialize access to request queue
 437  * @req_q_time: time of last fill level change
 438  * @req_q_util: used for accounting
 439  * @req_q_full: queue full incidents
 440  * @req_q_wq: used to wait for SBAL availability
 441  * @adapter: adapter used in conjunction with this QDIO structure
 442  */
 443 struct zfcp_qdio {
 444         struct zfcp_qdio_queue  resp_q;
 445         struct zfcp_qdio_queue  req_q;
 446         spinlock_t              stat_lock;
 447         spinlock_t              req_q_lock;
 448         ktime_t                 req_q_time;
 449         u64                     req_q_util;
 450         atomic_t                req_q_full;
 451         wait_queue_head_t       req_q_wq;
 452         struct zfcp_adapter     *adapter;
 453 };
 454
 455 struct zfcp_adapter {
 456         atomic_t                refcount;          /* reference count */
 457         wait_queue_head_t       remove_wq;         /* can be used to wait for
 458                                                       refcount drop to zero */
 459         u64                     peer_wwnn;         /* P2P peer WWNN */
 460         u64                     peer_wwpn;         /* P2P peer WWPN */
 461         u32                     peer_d_id;         /* P2P peer D_ID */
 462         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 463         struct zfcp_qdio        *qdio;
 464         u32                     hydra_version;     /* Hydra version */
 465         u32                     fsf_lic_version;
 466         u32                     adapter_features;  /* FCP channel features */
 467         u32                     connection_features; /* host connection features */
 468         u32                     hardware_version;  /* of FCP channel */
 469         u16                     timer_ticks;       /* time int for a tick */
 470         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 471         struct list_head        port_list_head;    /* remote port list */
 472         unsigned long           req_no;            /* unique FSF req number */
 473         struct list_head        *req_list;         /* list of pending reqs */
 474         spinlock_t              req_list_lock;     /* request list lock */
 475         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 476         rwlock_t                abort_lock;        /* Protects against SCSI
 477                                                       stack abort/command
 478                                                       completion races */
 479         atomic_t                stat_miss;         /* # missing status reads*/
 480         struct work_struct      stat_work;
 481         atomic_t                status;            /* status of this adapter */
 482         struct list_head        erp_ready_head;    /* error recovery for this
 483                                                       adapter/devices */
 484         struct list_head        erp_running_head;
 485         rwlock_t                erp_lock;
 486         struct semaphore        erp_ready_sem;
 487         wait_queue_head_t       erp_thread_wqh;
 488         wait_queue_head_t       erp_done_wqh;
 489         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 490         atomic_t                erp_counter;
 491         u32                     erp_total_count;   /* total nr of enqueued erp
 492                                                       actions */
 493         u32                     erp_low_mem_count; /* nr of erp actions waiting
 494                                                       for memory */
 495         struct zfcp_wka_ports   *gs;               /* generic services */
 496         struct zfcp_dbf         *dbf;              /* debug traces */
 497         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 498         struct fc_host_statistics *fc_stats;
 499         struct fsf_qtcb_bottom_port *stats_reset_data;
 500         unsigned long           stats_reset;
 501         struct work_struct      scan_work;
 502         struct service_level    service_level;
 503         struct workqueue_struct *work_queue;
 504 };
 505
 506 struct zfcp_port {
 507         struct device          sysfs_device;   /* sysfs device */
 508         struct fc_rport        *rport;         /* rport of fc transport class */
 509         struct list_head       list;           /* list of remote ports */
 510         atomic_t               refcount;       /* reference count */
 511         wait_queue_head_t      remove_wq;      /* can be used to wait for
 512                                                   refcount drop to zero */
 513         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 514         struct list_head       unit_list_head; /* head of logical unit list */
 515         atomic_t               status;         /* status of this remote port */
 516         u64                    wwnn;           /* WWNN if known */
 517         u64                    wwpn;           /* WWPN */
 518         u32                    d_id;           /* D_ID */
 519         u32                    handle;         /* handle assigned by FSF */
 520         struct zfcp_erp_action erp_action;     /* pending error recovery */
 521         atomic_t               erp_counter;
 522         u32                    maxframe_size;
 523         u32                    supported_classes;
 524         struct work_struct     gid_pn_work;
 525         struct work_struct     test_link_work;
 526         struct work_struct     rport_work;
 527         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 528 };
 529
 530 struct zfcp_unit {
 531         struct device          sysfs_device;   /* sysfs device */
 532         struct list_head       list;           /* list of logical units */
 533         atomic_t               refcount;       /* reference count */
 534         wait_queue_head_t      remove_wq;      /* can be used to wait for
 535                                                   refcount drop to zero */
 536         struct zfcp_port       *port;          /* remote port of unit */
 537         atomic_t               status;         /* status of this logical unit */
 538         u64                    fcp_lun;        /* own FCP_LUN */
 539         u32                    handle;         /* handle assigned by FSF */
 540         struct scsi_device     *device;        /* scsi device struct pointer */
 541         struct zfcp_erp_action erp_action;     /* pending error recovery */
 542         atomic_t               erp_counter;
 543         struct zfcp_latencies   latencies;
 544         struct work_struct      scsi_work;
 545 };
 546
 547 /**
 548  * struct zfcp_queue_req - queue related values for a request
 549  * @sbal_number: number of free SBALs
 550  * @sbal_first: first SBAL for this request
 551  * @sbal_last: last SBAL for this request
 552  * @sbal_limit: last possible SBAL for this request
 553  * @sbale_curr: current SBALE at creation of this request
 554  * @sbal_response: SBAL used in interrupt
 555  * @qdio_outb_usage: usage of outbound queue
 556  * @qdio_inb_usage: usage of inbound queue
 557  */
 558 struct zfcp_queue_req {
 559         u8                     sbal_number;
 560         u8                     sbal_first;
 561         u8                     sbal_last;
 562         u8                     sbal_limit;
 563         u8                     sbale_curr;
 564         u8                     sbal_response;
 565         u16                    qdio_outb_usage;
 566         u16                    qdio_inb_usage;
 567 };
 568
 569 /**
 570  * struct zfcp_fsf_req - basic FSF request structure
 571  * @list: list of FSF requests
 572  * @req_id: unique request ID
 573  * @adapter: adapter this request belongs to
 574  * @queue_req: queue related values
 575  * @completion: used to signal the completion of the request
 576  * @status: status of the request
 577  * @fsf_command: FSF command issued
 578  * @qtcb: associated QTCB
 579  * @seq_no: sequence number of this request
 580  * @data: private data
 581  * @timer: timer data of this request
 582  * @erp_action: reference to erp action if request issued on behalf of ERP
 583  * @pool: reference to memory pool if used for this request
 584  * @issued: time when request was send (STCK)
 585  * @unit: reference to unit if this request is a SCSI request
 586  * @handler: handler which should be called to process response
 587  */
 588 struct zfcp_fsf_req {
 589         struct list_head        list;
 590         unsigned long           req_id;
 591         struct zfcp_adapter     *adapter;
 592         struct zfcp_queue_req   queue_req;
 593         struct completion       completion;
 594         u32                     status;
 595         u32                     fsf_command;
 596         struct fsf_qtcb         *qtcb;
 597         u32                     seq_no;
 598         void                    *data;
 599         struct timer_list       timer;
 600         struct zfcp_erp_action  *erp_action;
 601         mempool_t               *pool;
 602         unsigned long long      issued;
 603         struct zfcp_unit        *unit;
 604         void                    (*handler)(struct zfcp_fsf_req *);
 605 };
 606
 607 /* driver data */
 608 struct zfcp_data {
 609         struct scsi_host_template scsi_host_template;
 610         struct scsi_transport_template *scsi_transport_template;
 611         rwlock_t                config_lock;        /* serialises changes
 612                                                        to adapter/port/unit
 613                                                        lists */
 614         struct semaphore        config_sema;        /* serialises configuration
 615                                                        changes */
 616         struct kmem_cache       *gpn_ft_cache;
 617         struct kmem_cache       *qtcb_cache;
 618         struct kmem_cache       *sr_buffer_cache;
 619         struct kmem_cache       *gid_pn_cache;
 620 };
 621
 622 /********************** ZFCP SPECIFIC DEFINES ********************************/
 623
 624 #define ZFCP_SET                0x00000100
 625 #define ZFCP_CLEAR              0x00000200
 626
 627 /*
 628  * Helper functions for request ID management.
 629  */
 630 static inline int zfcp_reqlist_hash(unsigned long req_id)
 631 {
 632         return req_id % REQUEST_LIST_SIZE;
 633 }
 634
 635 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 636                                        struct zfcp_fsf_req *fsf_req)
 637 {
 638         list_del(&fsf_req->list);
 639 }
 640
 641 static inline struct zfcp_fsf_req *
 642 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 643 {
 644         struct zfcp_fsf_req *request;
 645         unsigned int idx;
 646
 647         idx = zfcp_reqlist_hash(req_id);
 648         list_for_each_entry(request, &adapter->req_list[idx], list)
 649                 if (request->req_id == req_id)
 650                         return request;
 651         return NULL;
 652 }
 653
 654 static inline struct zfcp_fsf_req *
 655 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 656 {
 657         struct zfcp_fsf_req *request;
 658         unsigned int idx;
 659
 660         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 661                 list_for_each_entry(request, &adapter->req_list[idx], list)
 662                         if (request == req)
 663                                 return request;
 664         }
 665         return NULL;
 666 }
 667
 668 /*
 669  *  functions needed for reference/usage counting
 670  */
 671
 672 static inline void
 673 zfcp_unit_get(struct zfcp_unit *unit)
 674 {
 675         atomic_inc(&unit->refcount);
 676 }
 677
 678 static inline void
 679 zfcp_unit_put(struct zfcp_unit *unit)
 680 {
 681         if (atomic_dec_return(&unit->refcount) == 0)
 682                 wake_up(&unit->remove_wq);
 683 }
 684
 685 static inline void
 686 zfcp_port_get(struct zfcp_port *port)
 687 {
 688         atomic_inc(&port->refcount);
 689 }
 690
 691 static inline void
 692 zfcp_port_put(struct zfcp_port *port)
 693 {
 694         if (atomic_dec_return(&port->refcount) == 0)
 695                 wake_up(&port->remove_wq);
 696 }
 697
 698 static inline void
 699 zfcp_adapter_get(struct zfcp_adapter *adapter)
 700 {
 701         atomic_inc(&adapter->refcount);
 702 }
 703
 704 static inline void
 705 zfcp_adapter_put(struct zfcp_adapter *adapter)
 706 {
 707         if (atomic_dec_return(&adapter->refcount) == 0)
 708                 wake_up(&adapter->remove_wq);
 709 }
 710
 711 #endif /* ZFCP_DEF_H */