drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13 #include <asm/atomic.h>
  14
  15 /* Find start of Sense Information in FCP response unit*/
  16 char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  17 {
  18         char *fcp_sns_info_ptr;
  19
  20         fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
  21         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  22                 fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
  23
  24         return fcp_sns_info_ptr;
  25 }
  26
  27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  28 {
  29         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  30         unit->device = NULL;
  31         zfcp_unit_put(unit);
  32 }
  33
  34 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  35 {
  36         if (sdp->tagged_supported)
  37                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
  38         else
  39                 scsi_adjust_queue_depth(sdp, 0, 1);
  40         return 0;
  41 }
  42
  43 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  44 {
  45         set_host_byte(scpnt, result);
  46         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
  47                 zfcp_scsi_dbf_event_result("fail", 4,
  48                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
  49                         scpnt, NULL);
  50         /* return directly */
  51         scpnt->scsi_done(scpnt);
  52 }
  53
  54 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  55                                   void (*done) (struct scsi_cmnd *))
  56 {
  57         struct zfcp_unit *unit;
  58         struct zfcp_adapter *adapter;
  59         int    status, scsi_result, ret;
  60         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  61
  62         /* reset the status for this request */
  63         scpnt->result = 0;
  64         scpnt->host_scribble = NULL;
  65         scpnt->scsi_done = done;
  66
  67         /*
  68          * figure out adapter and target device
  69          * (stored there by zfcp_scsi_slave_alloc)
  70          */
  71         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  72         unit = scpnt->device->hostdata;
  73
  74         BUG_ON(!adapter || (adapter != unit->port->adapter));
  75         BUG_ON(!scpnt->scsi_done);
  76
  77         if (unlikely(!unit)) {
  78                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  79                 return 0;
  80         }
  81
  82         scsi_result = fc_remote_port_chkready(rport);
  83         if (unlikely(scsi_result)) {
  84                 scpnt->result = scsi_result;
  85                 zfcp_scsi_dbf_event_result("fail", 4, adapter, scpnt, NULL);
  86                 scpnt->scsi_done(scpnt);
  87                 return 0;
  88         }
  89
  90         status = atomic_read(&unit->status);
  91         if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
  92                      !(status & ZFCP_STATUS_COMMON_RUNNING))) {
  93                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  94                 return 0;;
  95         }
  96
  97         ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
  98         if (unlikely(ret == -EBUSY))
  99                 return SCSI_MLQUEUE_DEVICE_BUSY;
 100         else if (unlikely(ret < 0))
 101                 return SCSI_MLQUEUE_HOST_BUSY;
 102
 103         return ret;
 104 }
 105
 106 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 107                                           int channel, unsigned int id,
 108                                           unsigned int lun)
 109 {
 110         struct zfcp_port *port;
 111         struct zfcp_unit *unit;
 112         int scsi_lun;
 113
 114         list_for_each_entry(port, &adapter->port_list_head, list) {
 115                 if (!port->rport || (id != port->rport->scsi_target_id))
 116                         continue;
 117                 list_for_each_entry(unit, &port->unit_list_head, list) {
 118                         scsi_lun = scsilun_to_int(
 119                                 (struct scsi_lun *)&unit->fcp_lun);
 120                         if (lun == scsi_lun)
 121                                 return unit;
 122                 }
 123         }
 124
 125         return NULL;
 126 }
 127
 128 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 129 {
 130         struct zfcp_adapter *adapter;
 131         struct zfcp_unit *unit;
 132         unsigned long flags;
 133         int retval = -ENXIO;
 134
 135         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 136         if (!adapter)
 137                 goto out;
 138
 139         read_lock_irqsave(&zfcp_data.config_lock, flags);
 140         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 141         if (unit) {
 142                 sdp->hostdata = unit;
 143                 unit->device = sdp;
 144                 zfcp_unit_get(unit);
 145                 retval = 0;
 146         }
 147         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 148 out:
 149         return retval;
 150 }
 151
 152 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 153 {
 154         struct Scsi_Host *scsi_host = scpnt->device->host;
 155         struct zfcp_adapter *adapter =
 156                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 157         struct zfcp_unit *unit = scpnt->device->hostdata;
 158         struct zfcp_fsf_req *old_req, *abrt_req;
 159         unsigned long flags;
 160         unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
 161         int retval = SUCCESS;
 162         int retry = 3;
 163
 164         /* avoid race condition between late normal completion and abort */
 165         write_lock_irqsave(&adapter->abort_lock, flags);
 166
 167         spin_lock(&adapter->req_list_lock);
 168         old_req = zfcp_reqlist_find(adapter, old_req_id);
 169         spin_unlock(&adapter->req_list_lock);
 170         if (!old_req) {
 171                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 172                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL,
 173                                           old_req_id);
 174                 return FAILED; /* completion could be in progress */
 175         }
 176         old_req->data = NULL;
 177
 178         /* don't access old fsf_req after releasing the abort_lock */
 179         write_unlock_irqrestore(&adapter->abort_lock, flags);
 180
 181         while (retry--) {
 182                 abrt_req = zfcp_fsf_abort_fcp_command(old_req_id, unit);
 183                 if (abrt_req)
 184                         break;
 185
 186                 zfcp_erp_wait(adapter);
 187                 if (!(atomic_read(&adapter->status) &
 188                       ZFCP_STATUS_COMMON_RUNNING)) {
 189                         zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 190                                                   old_req_id);
 191                         return SUCCESS;
 192                 }
 193         }
 194         if (!abrt_req)
 195                 return FAILED;
 196
 197         wait_event(abrt_req->completion_wq,
 198                    abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 199
 200         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 201                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, abrt_req, 0);
 202         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 203                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, abrt_req, 0);
 204         else {
 205                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, abrt_req, 0);
 206                 retval = FAILED;
 207         }
 208         zfcp_fsf_req_free(abrt_req);
 209         return retval;
 210 }
 211
 212 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 213 {
 214         struct zfcp_unit *unit = scpnt->device->hostdata;
 215         struct zfcp_adapter *adapter = unit->port->adapter;
 216         struct zfcp_fsf_req *fsf_req;
 217         int retval = SUCCESS;
 218         int retry = 3;
 219
 220         while (retry--) {
 221                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 222                 if (fsf_req)
 223                         break;
 224
 225                 zfcp_erp_wait(adapter);
 226                 if (!(atomic_read(&adapter->status) &
 227                       ZFCP_STATUS_COMMON_RUNNING)) {
 228                         zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit,
 229                                                      scpnt);
 230                         return SUCCESS;
 231                 }
 232         }
 233         if (!fsf_req)
 234                 return FAILED;
 235
 236         wait_event(fsf_req->completion_wq,
 237                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 238
 239         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 240                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 241                 retval = FAILED;
 242         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 243                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 244                 retval = FAILED;
 245         } else
 246                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 247
 248         zfcp_fsf_req_free(fsf_req);
 249         return retval;
 250 }
 251
 252 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 253 {
 254         return zfcp_task_mgmt_function(scpnt, FCP_LOGICAL_UNIT_RESET);
 255 }
 256
 257 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 258 {
 259         return zfcp_task_mgmt_function(scpnt, FCP_TARGET_RESET);
 260 }
 261
 262 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 263 {
 264         struct zfcp_unit *unit = scpnt->device->hostdata;
 265         struct zfcp_adapter *adapter = unit->port->adapter;
 266
 267         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 268         zfcp_erp_wait(adapter);
 269
 270         return SUCCESS;
 271 }
 272
 273 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 274 {
 275         struct ccw_dev_id dev_id;
 276
 277         if (adapter->scsi_host)
 278                 return 0;
 279
 280         ccw_device_get_id(adapter->ccw_device, &dev_id);
 281         /* register adapter as SCSI host with mid layer of SCSI stack */
 282         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 283                                              sizeof (struct zfcp_adapter *));
 284         if (!adapter->scsi_host) {
 285                 dev_err(&adapter->ccw_device->dev,
 286                         "Registering the FCP device with the "
 287                         "SCSI stack failed\n");
 288                 return -EIO;
 289         }
 290
 291         /* tell the SCSI stack some characteristics of this adapter */
 292         adapter->scsi_host->max_id = 1;
 293         adapter->scsi_host->max_lun = 1;
 294         adapter->scsi_host->max_channel = 0;
 295         adapter->scsi_host->unique_id = dev_id.devno;
 296         adapter->scsi_host->max_cmd_len = 255;
 297         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 298
 299         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 300
 301         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 302                 scsi_host_put(adapter->scsi_host);
 303                 return -EIO;
 304         }
 305
 306         return 0;
 307 }
 308
 309 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 310 {
 311         struct Scsi_Host *shost;
 312         struct zfcp_port *port;
 313
 314         shost = adapter->scsi_host;
 315         if (!shost)
 316                 return;
 317
 318         read_lock_irq(&zfcp_data.config_lock);
 319         list_for_each_entry(port, &adapter->port_list_head, list)
 320                 if (port->rport)
 321                         port->rport = NULL;
 322
 323         read_unlock_irq(&zfcp_data.config_lock);
 324         fc_remove_host(shost);
 325         scsi_remove_host(shost);
 326         scsi_host_put(shost);
 327         adapter->scsi_host = NULL;
 328
 329         return;
 330 }
 331
 332 static struct fc_host_statistics*
 333 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 334 {
 335         struct fc_host_statistics *fc_stats;
 336
 337         if (!adapter->fc_stats) {
 338                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 339                 if (!fc_stats)
 340                         return NULL;
 341                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 342         }
 343         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 344         return adapter->fc_stats;
 345 }
 346
 347 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 348                                       struct fsf_qtcb_bottom_port *data,
 349                                       struct fsf_qtcb_bottom_port *old)
 350 {
 351         fc_stats->seconds_since_last_reset =
 352                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 353         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 354         fc_stats->tx_words = data->tx_words - old->tx_words;
 355         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 356         fc_stats->rx_words = data->rx_words - old->rx_words;
 357         fc_stats->lip_count = data->lip - old->lip;
 358         fc_stats->nos_count = data->nos - old->nos;
 359         fc_stats->error_frames = data->error_frames - old->error_frames;
 360         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 361         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 362         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 363         fc_stats->loss_of_signal_count =
 364                 data->loss_of_signal - old->loss_of_signal;
 365         fc_stats->prim_seq_protocol_err_count =
 366                 data->psp_error_counts - old->psp_error_counts;
 367         fc_stats->invalid_tx_word_count =
 368                 data->invalid_tx_words - old->invalid_tx_words;
 369         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 370         fc_stats->fcp_input_requests =
 371                 data->input_requests - old->input_requests;
 372         fc_stats->fcp_output_requests =
 373                 data->output_requests - old->output_requests;
 374         fc_stats->fcp_control_requests =
 375                 data->control_requests - old->control_requests;
 376         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 377         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 378 }
 379
 380 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 381                                    struct fsf_qtcb_bottom_port *data)
 382 {
 383         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 384         fc_stats->tx_frames = data->tx_frames;
 385         fc_stats->tx_words = data->tx_words;
 386         fc_stats->rx_frames = data->rx_frames;
 387         fc_stats->rx_words = data->rx_words;
 388         fc_stats->lip_count = data->lip;
 389         fc_stats->nos_count = data->nos;
 390         fc_stats->error_frames = data->error_frames;
 391         fc_stats->dumped_frames = data->dumped_frames;
 392         fc_stats->link_failure_count = data->link_failure;
 393         fc_stats->loss_of_sync_count = data->loss_of_sync;
 394         fc_stats->loss_of_signal_count = data->loss_of_signal;
 395         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 396         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 397         fc_stats->invalid_crc_count = data->invalid_crcs;
 398         fc_stats->fcp_input_requests = data->input_requests;
 399         fc_stats->fcp_output_requests = data->output_requests;
 400         fc_stats->fcp_control_requests = data->control_requests;
 401         fc_stats->fcp_input_megabytes = data->input_mb;
 402         fc_stats->fcp_output_megabytes = data->output_mb;
 403 }
 404
 405 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 406 {
 407         struct zfcp_adapter *adapter;
 408         struct fc_host_statistics *fc_stats;
 409         struct fsf_qtcb_bottom_port *data;
 410         int ret;
 411
 412         adapter = (struct zfcp_adapter *)host->hostdata[0];
 413         fc_stats = zfcp_init_fc_host_stats(adapter);
 414         if (!fc_stats)
 415                 return NULL;
 416
 417         data = kzalloc(sizeof(*data), GFP_KERNEL);
 418         if (!data)
 419                 return NULL;
 420
 421         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 422         if (ret) {
 423                 kfree(data);
 424                 return NULL;
 425         }
 426
 427         if (adapter->stats_reset &&
 428             ((jiffies/HZ - adapter->stats_reset) <
 429              data->seconds_since_last_reset))
 430                 zfcp_adjust_fc_host_stats(fc_stats, data,
 431                                           adapter->stats_reset_data);
 432         else
 433                 zfcp_set_fc_host_stats(fc_stats, data);
 434
 435         kfree(data);
 436         return fc_stats;
 437 }
 438
 439 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 440 {
 441         struct zfcp_adapter *adapter;
 442         struct fsf_qtcb_bottom_port *data;
 443         int ret;
 444
 445         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 446         data = kzalloc(sizeof(*data), GFP_KERNEL);
 447         if (!data)
 448                 return;
 449
 450         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 451         if (ret)
 452                 kfree(data);
 453         else {
 454                 adapter->stats_reset = jiffies/HZ;
 455                 kfree(adapter->stats_reset_data);
 456                 adapter->stats_reset_data = data; /* finally freed in
 457                                                      adapter_dequeue */
 458         }
 459 }
 460
 461 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 462 {
 463         struct zfcp_adapter *adapter =
 464                 (struct zfcp_adapter *)shost->hostdata[0];
 465         int status = atomic_read(&adapter->status);
 466
 467         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 468             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 469                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 470         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 471                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 472         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 473                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 474         else
 475                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 476 }
 477
 478 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 479 {
 480         rport->dev_loss_tmo = timeout;
 481 }
 482
 483 /**
 484  * zfcp_scsi_dev_loss_tmo_callbk - Free any reference to rport
 485  * @rport: The rport that is about to be deleted.
 486  */
 487 static void zfcp_scsi_dev_loss_tmo_callbk(struct fc_rport *rport)
 488 {
 489         struct zfcp_port *port;
 490
 491         write_lock_irq(&zfcp_data.config_lock);
 492         port = rport->dd_data;
 493         if (port)
 494                 port->rport = NULL;
 495         write_unlock_irq(&zfcp_data.config_lock);
 496 }
 497
 498 /**
 499  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 500  * @rport: The FC rport where to teminate I/O
 501  *
 502  * Abort all pending SCSI commands for a port by closing the
 503  * port. Using a reopen for avoids a conflict with a shutdown
 504  * overwriting a reopen.
 505  */
 506 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 507 {
 508         struct zfcp_port *port;
 509
 510         write_lock_irq(&zfcp_data.config_lock);
 511         port = rport->dd_data;
 512         if (port)
 513                 zfcp_port_get(port);
 514         write_unlock_irq(&zfcp_data.config_lock);
 515
 516         if (port) {
 517                 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
 518                 zfcp_port_put(port);
 519         }
 520 }
 521
 522 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 523 {
 524         struct fc_rport_identifiers ids;
 525         struct fc_rport *rport;
 526
 527         ids.node_name = port->wwnn;
 528         ids.port_name = port->wwpn;
 529         ids.port_id = port->d_id;
 530         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 531
 532         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 533         if (!rport) {
 534                 dev_err(&port->adapter->ccw_device->dev,
 535                         "Registering port 0x%016Lx failed\n",
 536                         (unsigned long long)port->wwpn);
 537                 return;
 538         }
 539
 540         rport->dd_data = port;
 541         rport->maxframe_size = port->maxframe_size;
 542         rport->supported_classes = port->supported_classes;
 543         port->rport = rport;
 544 }
 545
 546 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 547 {
 548         struct fc_rport *rport = port->rport;
 549
 550         if (rport)
 551                 fc_remote_port_delete(rport);
 552 }
 553
 554 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 555 {
 556         zfcp_port_get(port);
 557         port->rport_task = RPORT_ADD;
 558
 559         if (!queue_work(zfcp_data.work_queue, &port->rport_work))
 560                 zfcp_port_put(port);
 561 }
 562
 563 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 564 {
 565         zfcp_port_get(port);
 566         port->rport_task = RPORT_DEL;
 567
 568         if (!queue_work(zfcp_data.work_queue, &port->rport_work))
 569                 zfcp_port_put(port);
 570 }
 571
 572 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 573 {
 574         struct zfcp_port *port;
 575
 576         list_for_each_entry(port, &adapter->port_list_head, list)
 577                 zfcp_scsi_schedule_rport_block(port);
 578 }
 579
 580 void zfcp_scsi_rport_work(struct work_struct *work)
 581 {
 582         struct zfcp_port *port = container_of(work, struct zfcp_port,
 583                                               rport_work);
 584
 585         while (port->rport_task) {
 586                 if (port->rport_task == RPORT_ADD) {
 587                         port->rport_task = RPORT_NONE;
 588                         zfcp_scsi_rport_register(port);
 589                 } else {
 590                         port->rport_task = RPORT_NONE;
 591                         zfcp_scsi_rport_block(port);
 592                 }
 593         }
 594
 595         zfcp_port_put(port);
 596 }
 597
 598
 599 void zfcp_scsi_scan(struct work_struct *work)
 600 {
 601         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 602                                               scsi_work);
 603         struct fc_rport *rport;
 604
 605         flush_work(&unit->port->rport_work);
 606         rport = unit->port->rport;
 607
 608         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 609                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 610                                  scsilun_to_int((struct scsi_lun *)
 611                                                 &unit->fcp_lun), 0);
 612
 613         zfcp_unit_put(unit);
 614 }
 615
 616 struct fc_function_template zfcp_transport_functions = {
 617         .show_starget_port_id = 1,
 618         .show_starget_port_name = 1,
 619         .show_starget_node_name = 1,
 620         .show_rport_supported_classes = 1,
 621         .show_rport_maxframe_size = 1,
 622         .show_rport_dev_loss_tmo = 1,
 623         .show_host_node_name = 1,
 624         .show_host_port_name = 1,
 625         .show_host_permanent_port_name = 1,
 626         .show_host_supported_classes = 1,
 627         .show_host_supported_speeds = 1,
 628         .show_host_maxframe_size = 1,
 629         .show_host_serial_number = 1,
 630         .get_fc_host_stats = zfcp_get_fc_host_stats,
 631         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 632         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 633         .get_host_port_state = zfcp_get_host_port_state,
 634         .dev_loss_tmo_callbk = zfcp_scsi_dev_loss_tmo_callbk,
 635         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 636         .show_host_port_state = 1,
 637         /* no functions registered for following dynamic attributes but
 638            directly set by LLDD */
 639         .show_host_port_type = 1,
 640         .show_host_speed = 1,
 641         .show_host_port_id = 1,
 642         .disable_target_scan = 1,
 643 };
 644
 645 struct zfcp_data zfcp_data = {
 646         .scsi_host_template = {
 647                 .name                    = "zfcp",
 648                 .module                  = THIS_MODULE,
 649                 .proc_name               = "zfcp",
 650                 .slave_alloc             = zfcp_scsi_slave_alloc,
 651                 .slave_configure         = zfcp_scsi_slave_configure,
 652                 .slave_destroy           = zfcp_scsi_slave_destroy,
 653                 .queuecommand            = zfcp_scsi_queuecommand,
 654                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 655                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 656                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 657                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 658                 .can_queue               = 4096,
 659                 .this_id                 = -1,
 660                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 661                 .cmd_per_lun             = 1,
 662                 .use_clustering          = 1,
 663                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 664                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 665                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 666         },
 667 };