SAFE public projects git trees. - safe/jmp/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/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 /* task attribute values in FCP-2 FCP_CMND IU */
  77 #define SIMPLE_Q        0
  78 #define HEAD_OF_Q       1
  79 #define ORDERED_Q       2
  80 #define ACA_Q           4
  81 #define UNTAGGED        5
  82
  83 /* task management flags in FCP-2 FCP_CMND IU */
  84 #define FCP_CLEAR_ACA           0x40
  85 #define FCP_TARGET_RESET        0x20
  86 #define FCP_LOGICAL_UNIT_RESET  0x10
  87 #define FCP_CLEAR_TASK_SET      0x04
  88 #define FCP_ABORT_TASK_SET      0x02
  89
  90 #define FCP_CDB_LENGTH          16
  91
  92 #define ZFCP_DID_MASK           0x00FFFFFF
  93
  94 /* FCP(-2) FCP_CMND IU */
  95 struct fcp_cmnd_iu {
  96         u64 fcp_lun;       /* FCP logical unit number */
  97         u8  crn;                   /* command reference number */
  98         u8  reserved0:5;           /* reserved */
  99         u8  task_attribute:3;      /* task attribute */
 100         u8  task_management_flags; /* task management flags */
 101         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 102         u8  rddata:1;              /* read data */
 103         u8  wddata:1;              /* write data */
 104         u8  fcp_cdb[FCP_CDB_LENGTH];
 105 } __attribute__((packed));
 106
 107 /* FCP(-2) FCP_RSP IU */
 108 struct fcp_rsp_iu {
 109         u8  reserved0[10];
 110         union {
 111                 struct {
 112                         u8 reserved1:3;
 113                         u8 fcp_conf_req:1;
 114                         u8 fcp_resid_under:1;
 115                         u8 fcp_resid_over:1;
 116                         u8 fcp_sns_len_valid:1;
 117                         u8 fcp_rsp_len_valid:1;
 118                 } bits;
 119                 u8 value;
 120         } validity;
 121         u8  scsi_status;
 122         u32 fcp_resid;
 123         u32 fcp_sns_len;
 124         u32 fcp_rsp_len;
 125 } __attribute__((packed));
 126
 127
 128 #define RSP_CODE_GOOD            0
 129 #define RSP_CODE_LENGTH_MISMATCH 1
 130 #define RSP_CODE_FIELD_INVALID   2
 131 #define RSP_CODE_RO_MISMATCH     3
 132 #define RSP_CODE_TASKMAN_UNSUPP  4
 133 #define RSP_CODE_TASKMAN_FAILED  5
 134
 135 /* see fc-fs */
 136 #define LS_RSCN  0x61
 137 #define LS_LOGO  0x05
 138 #define LS_PLOGI 0x03
 139
 140 struct fcp_rscn_head {
 141         u8  command;
 142         u8  page_length; /* always 0x04 */
 143         u16 payload_len;
 144 } __attribute__((packed));
 145
 146 struct fcp_rscn_element {
 147         u8  reserved:2;
 148         u8  event_qual:4;
 149         u8  addr_format:2;
 150         u32 nport_did:24;
 151 } __attribute__((packed));
 152
 153 /* see fc-ph */
 154 struct fcp_logo {
 155         u32 command;
 156         u32 nport_did;
 157         u64 nport_wwpn;
 158 } __attribute__((packed));
 159
 160 /*
 161  * FC-FS stuff
 162  */
 163 #define R_A_TOV                         10 /* seconds */
 164
 165 #define ZFCP_LS_RLS                     0x0f
 166 #define ZFCP_LS_ADISC                   0x52
 167 #define ZFCP_LS_RPS                     0x56
 168 #define ZFCP_LS_RSCN                    0x61
 169 #define ZFCP_LS_RNID                    0x78
 170
 171 struct zfcp_ls_adisc {
 172         u8              code;
 173         u8              field[3];
 174         u32             hard_nport_id;
 175         u64             wwpn;
 176         u64             wwnn;
 177         u32             nport_id;
 178 } __attribute__ ((packed));
 179
 180 /*
 181  * FC-GS-2 stuff
 182  */
 183 #define ZFCP_CT_REVISION                0x01
 184 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 185 #define ZFCP_CT_NAME_SERVER             0x02
 186 #define ZFCP_CT_SYNCHRONOUS             0x00
 187 #define ZFCP_CT_SCSI_FCP                0x08
 188 #define ZFCP_CT_UNABLE_TO_PERFORM_CMD   0x09
 189 #define ZFCP_CT_GID_PN                  0x0121
 190 #define ZFCP_CT_GPN_FT                  0x0172
 191 #define ZFCP_CT_ACCEPT                  0x8002
 192 #define ZFCP_CT_REJECT                  0x8001
 193
 194 /*
 195  * FC-GS-4 stuff
 196  */
 197 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 198
 199 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 200
 201 /*
 202  * Note, the leftmost status byte is common among adapter, port
 203  * and unit
 204  */
 205 #define ZFCP_COMMON_FLAGS                       0xfff00000
 206
 207 /* common status bits */
 208 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 209 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 210 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 211 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 212 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 213 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 214 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 215 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 216 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
 217
 218 /* adapter status */
 219 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 220 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 221 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 222 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 223 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 224
 225 /* FC-PH/FC-GS well-known address identifiers for generic services */
 226 #define ZFCP_DID_WKA                            0xFFFFF0
 227
 228 /* remote port status */
 229 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 230 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
 231
 232 /* well known address (WKA) port status*/
 233 enum zfcp_wka_status {
 234         ZFCP_WKA_PORT_OFFLINE,
 235         ZFCP_WKA_PORT_CLOSING,
 236         ZFCP_WKA_PORT_OPENING,
 237         ZFCP_WKA_PORT_ONLINE,
 238 };
 239
 240 /* logical unit status */
 241 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 242 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 243
 244 /* FSF request status (this does not have a common part) */
 245 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 246 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 247 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 248 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 249 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 250 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 251 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 252 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 253 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 254 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 255
 256 /************************* STRUCTURE DEFINITIONS *****************************/
 257
 258 struct zfcp_fsf_req;
 259
 260 /* holds various memory pools of an adapter */
 261 struct zfcp_adapter_mempool {
 262         mempool_t *erp_req;
 263         mempool_t *gid_pn_req;
 264         mempool_t *scsi_req;
 265         mempool_t *scsi_abort;
 266         mempool_t *status_read_req;
 267         mempool_t *status_read_data;
 268         mempool_t *gid_pn_data;
 269         mempool_t *qtcb_pool;
 270 };
 271
 272 /*
 273  * header for CT_IU
 274  */
 275 struct ct_hdr {
 276         u8 revision;            // 0x01
 277         u8 in_id[3];            // 0x00
 278         u8 gs_type;             // 0xFC Directory Service
 279         u8 gs_subtype;          // 0x02 Name Server
 280         u8 options;             // 0x00 single bidirectional exchange
 281         u8 reserved0;
 282         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 283         u16 max_res_size;       // <= (4096 - 16) / 4
 284         u8 reserved1;
 285         u8 reason_code;
 286         u8 reason_code_expl;
 287         u8 vendor_unique;
 288 } __attribute__ ((packed));
 289
 290 /* nameserver request CT_IU -- for requests where
 291  * a port name is required */
 292 struct ct_iu_gid_pn_req {
 293         struct ct_hdr header;
 294         u64 wwpn;
 295 } __attribute__ ((packed));
 296
 297 /* FS_ACC IU and data unit for GID_PN nameserver request */
 298 struct ct_iu_gid_pn_resp {
 299         struct ct_hdr header;
 300         u32 d_id;
 301 } __attribute__ ((packed));
 302
 303 struct ct_iu_gpn_ft_req {
 304         struct ct_hdr header;
 305         u8 flags;
 306         u8 domain_id_scope;
 307         u8 area_id_scope;
 308         u8 fc4_type;
 309 } __attribute__ ((packed));
 310
 311
 312 /**
 313  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 314  * @wka_port: port where the request is sent to
 315  * @req: scatter-gather list for request
 316  * @resp: scatter-gather list for response
 317  * @handler: handler function (called for response to the request)
 318  * @handler_data: data passed to handler function
 319  * @completion: completion for synchronization purposes
 320  * @status: used to pass error status to calling function
 321  */
 322 struct zfcp_send_ct {
 323         struct zfcp_wka_port *wka_port;
 324         struct scatterlist *req;
 325         struct scatterlist *resp;
 326         void (*handler)(unsigned long);
 327         unsigned long handler_data;
 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_wka_ports {
 380         struct zfcp_wka_port ms;        /* management service */
 381         struct zfcp_wka_port ts;        /* time service */
 382         struct zfcp_wka_port ds;        /* directory service */
 383         struct zfcp_wka_port as;        /* alias service */
 384         struct zfcp_wka_port ks;        /* key distribution service */
 385 };
 386
 387 struct zfcp_qdio_queue {
 388         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 389         u8                 first;       /* index of next free bfr in queue */
 390         atomic_t           count;       /* number of free buffers in queue */
 391 };
 392
 393 struct zfcp_erp_action {
 394         struct list_head list;
 395         int action;                   /* requested action code */
 396         struct zfcp_adapter *adapter; /* device which should be recovered */
 397         struct zfcp_port *port;
 398         struct zfcp_unit *unit;
 399         u32             status;       /* recovery status */
 400         u32 step;                     /* active step of this erp action */
 401         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 402                                          for this action */
 403         struct timer_list timer;
 404 };
 405
 406 struct fsf_latency_record {
 407         u32 min;
 408         u32 max;
 409         u64 sum;
 410 };
 411
 412 struct latency_cont {
 413         struct fsf_latency_record channel;
 414         struct fsf_latency_record fabric;
 415         u64 counter;
 416 };
 417
 418 struct zfcp_latencies {
 419         struct latency_cont read;
 420         struct latency_cont write;
 421         struct latency_cont cmd;
 422         spinlock_t lock;
 423 };
 424
 425 /** struct zfcp_qdio - basic QDIO data structure
 426  * @resp_q: response queue
 427  * @req_q: request queue
 428  * @stat_lock: lock to protect req_q_util and req_q_time
 429  * @req_q_lock; lock to serialize access to request queue
 430  * @req_q_time: time of last fill level change
 431  * @req_q_util: used for accounting
 432  * @req_q_full: queue full incidents
 433  * @req_q_wq: used to wait for SBAL availability
 434  * @adapter: adapter used in conjunction with this QDIO structure
 435  */
 436 struct zfcp_qdio {
 437         struct zfcp_qdio_queue  resp_q;
 438         struct zfcp_qdio_queue  req_q;
 439         spinlock_t              stat_lock;
 440         spinlock_t              req_q_lock;
 441         unsigned long long      req_q_time;
 442         u64                     req_q_util;
 443         atomic_t                req_q_full;
 444         wait_queue_head_t       req_q_wq;
 445         struct zfcp_adapter     *adapter;
 446 };
 447
 448 struct zfcp_adapter {
 449         atomic_t                refcount;          /* reference count */
 450         wait_queue_head_t       remove_wq;         /* can be used to wait for
 451                                                       refcount drop to zero */
 452         u64                     peer_wwnn;         /* P2P peer WWNN */
 453         u64                     peer_wwpn;         /* P2P peer WWPN */
 454         u32                     peer_d_id;         /* P2P peer D_ID */
 455         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 456         struct zfcp_qdio        *qdio;
 457         u32                     hydra_version;     /* Hydra version */
 458         u32                     fsf_lic_version;
 459         u32                     adapter_features;  /* FCP channel features */
 460         u32                     connection_features; /* host connection features */
 461         u32                     hardware_version;  /* of FCP channel */
 462         u16                     timer_ticks;       /* time int for a tick */
 463         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 464         struct list_head        port_list_head;    /* remote port list */
 465         unsigned long           req_no;            /* unique FSF req number */
 466         struct list_head        *req_list;         /* list of pending reqs */
 467         spinlock_t              req_list_lock;     /* request list lock */
 468         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 469         rwlock_t                abort_lock;        /* Protects against SCSI
 470                                                       stack abort/command
 471                                                       completion races */
 472         atomic_t                stat_miss;         /* # missing status reads*/
 473         struct work_struct      stat_work;
 474         atomic_t                status;            /* status of this adapter */
 475         struct list_head        erp_ready_head;    /* error recovery for this
 476                                                       adapter/devices */
 477         wait_queue_head_t       erp_ready_wq;
 478         struct list_head        erp_running_head;
 479         rwlock_t                erp_lock;
 480         wait_queue_head_t       erp_done_wqh;
 481         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 482         atomic_t                erp_counter;
 483         u32                     erp_total_count;   /* total nr of enqueued erp
 484                                                       actions */
 485         u32                     erp_low_mem_count; /* nr of erp actions waiting
 486                                                       for memory */
 487         struct task_struct      *erp_thread;
 488         struct zfcp_wka_ports   *gs;               /* generic services */
 489         struct zfcp_dbf         *dbf;              /* debug traces */
 490         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 491         struct fc_host_statistics *fc_stats;
 492         struct fsf_qtcb_bottom_port *stats_reset_data;
 493         unsigned long           stats_reset;
 494         struct work_struct      scan_work;
 495         struct service_level    service_level;
 496         struct workqueue_struct *work_queue;
 497 };
 498
 499 struct zfcp_port {
 500         struct device          sysfs_device;   /* sysfs device */
 501         struct fc_rport        *rport;         /* rport of fc transport class */
 502         struct list_head       list;           /* list of remote ports */
 503         atomic_t               refcount;       /* reference count */
 504         wait_queue_head_t      remove_wq;      /* can be used to wait for
 505                                                   refcount drop to zero */
 506         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 507         struct list_head       unit_list_head; /* head of logical unit list */
 508         atomic_t               status;         /* status of this remote port */
 509         u64                    wwnn;           /* WWNN if known */
 510         u64                    wwpn;           /* WWPN */
 511         u32                    d_id;           /* D_ID */
 512         u32                    handle;         /* handle assigned by FSF */
 513         struct zfcp_erp_action erp_action;     /* pending error recovery */
 514         atomic_t               erp_counter;
 515         u32                    maxframe_size;
 516         u32                    supported_classes;
 517         struct work_struct     gid_pn_work;
 518         struct work_struct     test_link_work;
 519         struct work_struct     rport_work;
 520         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 521 };
 522
 523 struct zfcp_unit {
 524         struct device          sysfs_device;   /* sysfs device */
 525         struct list_head       list;           /* list of logical units */
 526         atomic_t               refcount;       /* reference count */
 527         wait_queue_head_t      remove_wq;      /* can be used to wait for
 528                                                   refcount drop to zero */
 529         struct zfcp_port       *port;          /* remote port of unit */
 530         atomic_t               status;         /* status of this logical unit */
 531         u64                    fcp_lun;        /* own FCP_LUN */
 532         u32                    handle;         /* handle assigned by FSF */
 533         struct scsi_device     *device;        /* scsi device struct pointer */
 534         struct zfcp_erp_action erp_action;     /* pending error recovery */
 535         atomic_t               erp_counter;
 536         struct zfcp_latencies   latencies;
 537         struct work_struct      scsi_work;
 538 };
 539
 540 /**
 541  * struct zfcp_queue_req - queue related values for a request
 542  * @sbal_number: number of free SBALs
 543  * @sbal_first: first SBAL for this request
 544  * @sbal_last: last SBAL for this request
 545  * @sbal_limit: last possible SBAL for this request
 546  * @sbale_curr: current SBALE at creation of this request
 547  * @sbal_response: SBAL used in interrupt
 548  * @qdio_outb_usage: usage of outbound queue
 549  * @qdio_inb_usage: usage of inbound queue
 550  */
 551 struct zfcp_queue_req {
 552         u8                     sbal_number;
 553         u8                     sbal_first;
 554         u8                     sbal_last;
 555         u8                     sbal_limit;
 556         u8                     sbale_curr;
 557         u8                     sbal_response;
 558         u16                    qdio_outb_usage;
 559         u16                    qdio_inb_usage;
 560 };
 561
 562 /**
 563  * struct zfcp_fsf_req - basic FSF request structure
 564  * @list: list of FSF requests
 565  * @req_id: unique request ID
 566  * @adapter: adapter this request belongs to
 567  * @queue_req: queue related values
 568  * @completion: used to signal the completion of the request
 569  * @status: status of the request
 570  * @fsf_command: FSF command issued
 571  * @qtcb: associated QTCB
 572  * @seq_no: sequence number of this request
 573  * @data: private data
 574  * @timer: timer data of this request
 575  * @erp_action: reference to erp action if request issued on behalf of ERP
 576  * @pool: reference to memory pool if used for this request
 577  * @issued: time when request was send (STCK)
 578  * @unit: reference to unit if this request is a SCSI request
 579  * @handler: handler which should be called to process response
 580  */
 581 struct zfcp_fsf_req {
 582         struct list_head        list;
 583         unsigned long           req_id;
 584         struct zfcp_adapter     *adapter;
 585         struct zfcp_queue_req   queue_req;
 586         struct completion       completion;
 587         u32                     status;
 588         u32                     fsf_command;
 589         struct fsf_qtcb         *qtcb;
 590         u32                     seq_no;
 591         void                    *data;
 592         struct timer_list       timer;
 593         struct zfcp_erp_action  *erp_action;
 594         mempool_t               *pool;
 595         unsigned long long      issued;
 596         struct zfcp_unit        *unit;
 597         void                    (*handler)(struct zfcp_fsf_req *);
 598 };
 599
 600 /* driver data */
 601 struct zfcp_data {
 602         struct scsi_host_template scsi_host_template;
 603         struct scsi_transport_template *scsi_transport_template;
 604         rwlock_t                config_lock;        /* serialises changes
 605                                                        to adapter/port/unit
 606                                                        lists */
 607         struct mutex            config_mutex;
 608         struct kmem_cache       *gpn_ft_cache;
 609         struct kmem_cache       *qtcb_cache;
 610         struct kmem_cache       *sr_buffer_cache;
 611         struct kmem_cache       *gid_pn_cache;
 612 };
 613
 614 /********************** ZFCP SPECIFIC DEFINES ********************************/
 615
 616 #define ZFCP_SET                0x00000100
 617 #define ZFCP_CLEAR              0x00000200
 618
 619 /*
 620  * Helper functions for request ID management.
 621  */
 622 static inline int zfcp_reqlist_hash(unsigned long req_id)
 623 {
 624         return req_id % REQUEST_LIST_SIZE;
 625 }
 626
 627 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 628                                        struct zfcp_fsf_req *fsf_req)
 629 {
 630         list_del(&fsf_req->list);
 631 }
 632
 633 static inline struct zfcp_fsf_req *
 634 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 635 {
 636         struct zfcp_fsf_req *request;
 637         unsigned int idx;
 638
 639         idx = zfcp_reqlist_hash(req_id);
 640         list_for_each_entry(request, &adapter->req_list[idx], list)
 641                 if (request->req_id == req_id)
 642                         return request;
 643         return NULL;
 644 }
 645
 646 static inline struct zfcp_fsf_req *
 647 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 648 {
 649         struct zfcp_fsf_req *request;
 650         unsigned int idx;
 651
 652         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 653                 list_for_each_entry(request, &adapter->req_list[idx], list)
 654                         if (request == req)
 655                                 return request;
 656         }
 657         return NULL;
 658 }
 659
 660 /*
 661  *  functions needed for reference/usage counting
 662  */
 663
 664 static inline void
 665 zfcp_unit_get(struct zfcp_unit *unit)
 666 {
 667         atomic_inc(&unit->refcount);
 668 }
 669
 670 static inline void
 671 zfcp_unit_put(struct zfcp_unit *unit)
 672 {
 673         if (atomic_dec_return(&unit->refcount) == 0)
 674                 wake_up(&unit->remove_wq);
 675 }
 676
 677 static inline void
 678 zfcp_port_get(struct zfcp_port *port)
 679 {
 680         atomic_inc(&port->refcount);
 681 }
 682
 683 static inline void
 684 zfcp_port_put(struct zfcp_port *port)
 685 {
 686         if (atomic_dec_return(&port->refcount) == 0)
 687                 wake_up(&port->remove_wq);
 688 }
 689
 690 static inline void
 691 zfcp_adapter_get(struct zfcp_adapter *adapter)
 692 {
 693         atomic_inc(&adapter->refcount);
 694 }
 695
 696 static inline void
 697 zfcp_adapter_put(struct zfcp_adapter *adapter)
 698 {
 699         if (atomic_dec_return(&adapter->refcount) == 0)
 700                 wake_up(&adapter->remove_wq);
 701 }
 702
 703 #endif /* ZFCP_DEF_H */