drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corporation 2002, 2010
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <scsi/fc/fc_fcp.h>
  15 #include <asm/atomic.h>
  16 #include "zfcp_ext.h"
  17 #include "zfcp_dbf.h"
  18 #include "zfcp_fc.h"
  19 #include "zfcp_reqlist.h"
  20
  21 static unsigned int default_depth = 32;
  22 module_param_named(queue_depth, default_depth, uint, 0600);
  23 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  24
  25 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  26                                         int reason)
  27 {
  28         switch (reason) {
  29         case SCSI_QDEPTH_DEFAULT:
  30                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  31                 break;
  32         case SCSI_QDEPTH_QFULL:
  33                 scsi_track_queue_full(sdev, depth);
  34                 break;
  35         case SCSI_QDEPTH_RAMP_UP:
  36                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  37                 break;
  38         default:
  39                 return -EOPNOTSUPP;
  40         }
  41         return sdev->queue_depth;
  42 }
  43
  44 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  45 {
  46         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  47         unit->device = NULL;
  48         put_device(&unit->dev);
  49 }
  50
  51 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  52 {
  53         if (sdp->tagged_supported)
  54                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  55         else
  56                 scsi_adjust_queue_depth(sdp, 0, 1);
  57         return 0;
  58 }
  59
  60 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  61 {
  62         struct zfcp_adapter *adapter =
  63                 (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  64
  65         set_host_byte(scpnt, result);
  66         zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
  67         scpnt->scsi_done(scpnt);
  68 }
  69
  70 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  71                                   void (*done) (struct scsi_cmnd *))
  72 {
  73         struct zfcp_unit *unit;
  74         struct zfcp_adapter *adapter;
  75         int    status, scsi_result, ret;
  76         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  77
  78         /* reset the status for this request */
  79         scpnt->result = 0;
  80         scpnt->host_scribble = NULL;
  81         scpnt->scsi_done = done;
  82
  83         /*
  84          * figure out adapter and target device
  85          * (stored there by zfcp_scsi_slave_alloc)
  86          */
  87         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  88         unit = scpnt->device->hostdata;
  89
  90         scsi_result = fc_remote_port_chkready(rport);
  91         if (unlikely(scsi_result)) {
  92                 scpnt->result = scsi_result;
  93                 zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
  94                 scpnt->scsi_done(scpnt);
  95                 return 0;
  96         }
  97
  98         status = atomic_read(&unit->status);
  99         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 100                      !(atomic_read(&unit->port->status) &
 101                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 102                 /* only unit access denied, but port is good
 103                  * not covered by FC transport, have to fail here */
 104                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 105                 return 0;
 106         }
 107
 108         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 109                 /* This could be either
 110                  * open unit pending: this is temporary, will result in
 111                  *      open unit or ERP_FAILED, so retry command
 112                  * call to rport_delete pending: mimic retry from
 113                  *      fc_remote_port_chkready until rport is BLOCKED
 114                  */
 115                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 116                 return 0;
 117         }
 118
 119         ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
 120         if (unlikely(ret == -EBUSY))
 121                 return SCSI_MLQUEUE_DEVICE_BUSY;
 122         else if (unlikely(ret < 0))
 123                 return SCSI_MLQUEUE_HOST_BUSY;
 124
 125         return ret;
 126 }
 127
 128 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 129                                           unsigned int id, u64 lun)
 130 {
 131         unsigned long flags;
 132         struct zfcp_port *port;
 133         struct zfcp_unit *unit = NULL;
 134
 135         read_lock_irqsave(&adapter->port_list_lock, flags);
 136         list_for_each_entry(port, &adapter->port_list, list) {
 137                 if (!port->rport || (id != port->rport->scsi_target_id))
 138                         continue;
 139                 unit = zfcp_get_unit_by_lun(port, lun);
 140                 if (unit)
 141                         break;
 142         }
 143         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 144
 145         return unit;
 146 }
 147
 148 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 149 {
 150         struct zfcp_adapter *adapter;
 151         struct zfcp_unit *unit;
 152         u64 lun;
 153
 154         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 155         if (!adapter)
 156                 goto out;
 157
 158         int_to_scsilun(sdp->lun, (struct scsi_lun *)&lun);
 159         unit = zfcp_unit_lookup(adapter, sdp->id, lun);
 160         if (unit) {
 161                 sdp->hostdata = unit;
 162                 unit->device = sdp;
 163                 return 0;
 164         }
 165 out:
 166         return -ENXIO;
 167 }
 168
 169 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 170 {
 171         struct Scsi_Host *scsi_host = scpnt->device->host;
 172         struct zfcp_adapter *adapter =
 173                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 174         struct zfcp_unit *unit = scpnt->device->hostdata;
 175         struct zfcp_fsf_req *old_req, *abrt_req;
 176         unsigned long flags;
 177         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 178         int retval = SUCCESS;
 179         int retry = 3;
 180         char *dbf_tag;
 181
 182         /* avoid race condition between late normal completion and abort */
 183         write_lock_irqsave(&adapter->abort_lock, flags);
 184
 185         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 186         if (!old_req) {
 187                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 188                 zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
 189                                     old_reqid);
 190                 return FAILED; /* completion could be in progress */
 191         }
 192         old_req->data = NULL;
 193
 194         /* don't access old fsf_req after releasing the abort_lock */
 195         write_unlock_irqrestore(&adapter->abort_lock, flags);
 196
 197         while (retry--) {
 198                 abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
 199                 if (abrt_req)
 200                         break;
 201
 202                 zfcp_erp_wait(adapter);
 203                 fc_block_scsi_eh(scpnt);
 204                 if (!(atomic_read(&adapter->status) &
 205                       ZFCP_STATUS_COMMON_RUNNING)) {
 206                         zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
 207                                             old_reqid);
 208                         return SUCCESS;
 209                 }
 210         }
 211         if (!abrt_req)
 212                 return FAILED;
 213
 214         wait_for_completion(&abrt_req->completion);
 215
 216         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 217                 dbf_tag = "okay";
 218         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 219                 dbf_tag = "lte2";
 220         else {
 221                 dbf_tag = "fail";
 222                 retval = FAILED;
 223         }
 224         zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
 225         zfcp_fsf_req_free(abrt_req);
 226         return retval;
 227 }
 228
 229 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 230 {
 231         struct zfcp_unit *unit = scpnt->device->hostdata;
 232         struct zfcp_adapter *adapter = unit->port->adapter;
 233         struct zfcp_fsf_req *fsf_req = NULL;
 234         int retval = SUCCESS;
 235         int retry = 3;
 236
 237         while (retry--) {
 238                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 239                 if (fsf_req)
 240                         break;
 241
 242                 zfcp_erp_wait(adapter);
 243                 fc_block_scsi_eh(scpnt);
 244                 if (!(atomic_read(&adapter->status) &
 245                       ZFCP_STATUS_COMMON_RUNNING)) {
 246                         zfcp_dbf_scsi_devreset("nres", tm_flags, unit, scpnt);
 247                         return SUCCESS;
 248                 }
 249         }
 250         if (!fsf_req)
 251                 return FAILED;
 252
 253         wait_for_completion(&fsf_req->completion);
 254
 255         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 256                 zfcp_dbf_scsi_devreset("fail", tm_flags, unit, scpnt);
 257                 retval = FAILED;
 258         } else
 259                 zfcp_dbf_scsi_devreset("okay", tm_flags, unit, scpnt);
 260
 261         zfcp_fsf_req_free(fsf_req);
 262         return retval;
 263 }
 264
 265 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 266 {
 267         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 268 }
 269
 270 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 271 {
 272         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 273 }
 274
 275 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 276 {
 277         struct zfcp_unit *unit = scpnt->device->hostdata;
 278         struct zfcp_adapter *adapter = unit->port->adapter;
 279
 280         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 281         zfcp_erp_wait(adapter);
 282         fc_block_scsi_eh(scpnt);
 283
 284         return SUCCESS;
 285 }
 286
 287 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 288 {
 289         struct ccw_dev_id dev_id;
 290
 291         if (adapter->scsi_host)
 292                 return 0;
 293
 294         ccw_device_get_id(adapter->ccw_device, &dev_id);
 295         /* register adapter as SCSI host with mid layer of SCSI stack */
 296         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 297                                              sizeof (struct zfcp_adapter *));
 298         if (!adapter->scsi_host) {
 299                 dev_err(&adapter->ccw_device->dev,
 300                         "Registering the FCP device with the "
 301                         "SCSI stack failed\n");
 302                 return -EIO;
 303         }
 304
 305         /* tell the SCSI stack some characteristics of this adapter */
 306         adapter->scsi_host->max_id = 1;
 307         adapter->scsi_host->max_lun = 1;
 308         adapter->scsi_host->max_channel = 0;
 309         adapter->scsi_host->unique_id = dev_id.devno;
 310         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 311         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 312
 313         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 314
 315         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 316                 scsi_host_put(adapter->scsi_host);
 317                 return -EIO;
 318         }
 319
 320         return 0;
 321 }
 322
 323 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 324 {
 325         struct Scsi_Host *shost;
 326         struct zfcp_port *port;
 327
 328         shost = adapter->scsi_host;
 329         if (!shost)
 330                 return;
 331
 332         read_lock_irq(&adapter->port_list_lock);
 333         list_for_each_entry(port, &adapter->port_list, list)
 334                 port->rport = NULL;
 335         read_unlock_irq(&adapter->port_list_lock);
 336
 337         fc_remove_host(shost);
 338         scsi_remove_host(shost);
 339         scsi_host_put(shost);
 340         adapter->scsi_host = NULL;
 341
 342         return;
 343 }
 344
 345 static struct fc_host_statistics*
 346 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 347 {
 348         struct fc_host_statistics *fc_stats;
 349
 350         if (!adapter->fc_stats) {
 351                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 352                 if (!fc_stats)
 353                         return NULL;
 354                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 355         }
 356         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 357         return adapter->fc_stats;
 358 }
 359
 360 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 361                                       struct fsf_qtcb_bottom_port *data,
 362                                       struct fsf_qtcb_bottom_port *old)
 363 {
 364         fc_stats->seconds_since_last_reset =
 365                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 366         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 367         fc_stats->tx_words = data->tx_words - old->tx_words;
 368         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 369         fc_stats->rx_words = data->rx_words - old->rx_words;
 370         fc_stats->lip_count = data->lip - old->lip;
 371         fc_stats->nos_count = data->nos - old->nos;
 372         fc_stats->error_frames = data->error_frames - old->error_frames;
 373         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 374         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 375         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 376         fc_stats->loss_of_signal_count =
 377                 data->loss_of_signal - old->loss_of_signal;
 378         fc_stats->prim_seq_protocol_err_count =
 379                 data->psp_error_counts - old->psp_error_counts;
 380         fc_stats->invalid_tx_word_count =
 381                 data->invalid_tx_words - old->invalid_tx_words;
 382         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 383         fc_stats->fcp_input_requests =
 384                 data->input_requests - old->input_requests;
 385         fc_stats->fcp_output_requests =
 386                 data->output_requests - old->output_requests;
 387         fc_stats->fcp_control_requests =
 388                 data->control_requests - old->control_requests;
 389         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 390         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 391 }
 392
 393 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 394                                    struct fsf_qtcb_bottom_port *data)
 395 {
 396         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 397         fc_stats->tx_frames = data->tx_frames;
 398         fc_stats->tx_words = data->tx_words;
 399         fc_stats->rx_frames = data->rx_frames;
 400         fc_stats->rx_words = data->rx_words;
 401         fc_stats->lip_count = data->lip;
 402         fc_stats->nos_count = data->nos;
 403         fc_stats->error_frames = data->error_frames;
 404         fc_stats->dumped_frames = data->dumped_frames;
 405         fc_stats->link_failure_count = data->link_failure;
 406         fc_stats->loss_of_sync_count = data->loss_of_sync;
 407         fc_stats->loss_of_signal_count = data->loss_of_signal;
 408         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 409         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 410         fc_stats->invalid_crc_count = data->invalid_crcs;
 411         fc_stats->fcp_input_requests = data->input_requests;
 412         fc_stats->fcp_output_requests = data->output_requests;
 413         fc_stats->fcp_control_requests = data->control_requests;
 414         fc_stats->fcp_input_megabytes = data->input_mb;
 415         fc_stats->fcp_output_megabytes = data->output_mb;
 416 }
 417
 418 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 419 {
 420         struct zfcp_adapter *adapter;
 421         struct fc_host_statistics *fc_stats;
 422         struct fsf_qtcb_bottom_port *data;
 423         int ret;
 424
 425         adapter = (struct zfcp_adapter *)host->hostdata[0];
 426         fc_stats = zfcp_init_fc_host_stats(adapter);
 427         if (!fc_stats)
 428                 return NULL;
 429
 430         data = kzalloc(sizeof(*data), GFP_KERNEL);
 431         if (!data)
 432                 return NULL;
 433
 434         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 435         if (ret) {
 436                 kfree(data);
 437                 return NULL;
 438         }
 439
 440         if (adapter->stats_reset &&
 441             ((jiffies/HZ - adapter->stats_reset) <
 442              data->seconds_since_last_reset))
 443                 zfcp_adjust_fc_host_stats(fc_stats, data,
 444                                           adapter->stats_reset_data);
 445         else
 446                 zfcp_set_fc_host_stats(fc_stats, data);
 447
 448         kfree(data);
 449         return fc_stats;
 450 }
 451
 452 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 453 {
 454         struct zfcp_adapter *adapter;
 455         struct fsf_qtcb_bottom_port *data;
 456         int ret;
 457
 458         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 459         data = kzalloc(sizeof(*data), GFP_KERNEL);
 460         if (!data)
 461                 return;
 462
 463         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 464         if (ret)
 465                 kfree(data);
 466         else {
 467                 adapter->stats_reset = jiffies/HZ;
 468                 kfree(adapter->stats_reset_data);
 469                 adapter->stats_reset_data = data; /* finally freed in
 470                                                      adapter_release */
 471         }
 472 }
 473
 474 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 475 {
 476         struct zfcp_adapter *adapter =
 477                 (struct zfcp_adapter *)shost->hostdata[0];
 478         int status = atomic_read(&adapter->status);
 479
 480         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 481             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 482                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 483         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 484                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 485         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 486                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 487         else
 488                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 489 }
 490
 491 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 492 {
 493         rport->dev_loss_tmo = timeout;
 494 }
 495
 496 /**
 497  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 498  * @rport: The FC rport where to teminate I/O
 499  *
 500  * Abort all pending SCSI commands for a port by closing the
 501  * port. Using a reopen avoiding a conflict with a shutdown
 502  * overwriting a reopen.
 503  */
 504 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 505 {
 506         struct zfcp_port *port;
 507         struct Scsi_Host *shost = rport_to_shost(rport);
 508         struct zfcp_adapter *adapter =
 509                 (struct zfcp_adapter *)shost->hostdata[0];
 510
 511         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 512
 513         if (port) {
 514                 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
 515                 put_device(&port->dev);
 516         }
 517 }
 518
 519 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 520 {
 521         struct fc_rport_identifiers ids;
 522         struct fc_rport *rport;
 523
 524         if (port->rport)
 525                 return;
 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->maxframe_size = port->maxframe_size;
 541         rport->supported_classes = port->supported_classes;
 542         port->rport = rport;
 543 }
 544
 545 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 546 {
 547         struct fc_rport *rport = port->rport;
 548
 549         if (rport) {
 550                 fc_remote_port_delete(rport);
 551                 port->rport = NULL;
 552         }
 553 }
 554
 555 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 556 {
 557         get_device(&port->dev);
 558         port->rport_task = RPORT_ADD;
 559
 560         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 561                 put_device(&port->dev);
 562 }
 563
 564 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 565 {
 566         get_device(&port->dev);
 567         port->rport_task = RPORT_DEL;
 568
 569         if (port->rport && queue_work(port->adapter->work_queue,
 570                                       &port->rport_work))
 571                 return;
 572
 573         put_device(&port->dev);
 574 }
 575
 576 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 577 {
 578         unsigned long flags;
 579         struct zfcp_port *port;
 580
 581         read_lock_irqsave(&adapter->port_list_lock, flags);
 582         list_for_each_entry(port, &adapter->port_list, list)
 583                 zfcp_scsi_schedule_rport_block(port);
 584         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 585 }
 586
 587 void zfcp_scsi_rport_work(struct work_struct *work)
 588 {
 589         struct zfcp_port *port = container_of(work, struct zfcp_port,
 590                                               rport_work);
 591
 592         while (port->rport_task) {
 593                 if (port->rport_task == RPORT_ADD) {
 594                         port->rport_task = RPORT_NONE;
 595                         zfcp_scsi_rport_register(port);
 596                 } else {
 597                         port->rport_task = RPORT_NONE;
 598                         zfcp_scsi_rport_block(port);
 599                 }
 600         }
 601
 602         put_device(&port->dev);
 603 }
 604
 605
 606 void zfcp_scsi_scan(struct work_struct *work)
 607 {
 608         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 609                                               scsi_work);
 610         struct fc_rport *rport;
 611
 612         flush_work(&unit->port->rport_work);
 613         rport = unit->port->rport;
 614
 615         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 616                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 617                                  scsilun_to_int((struct scsi_lun *)
 618                                                 &unit->fcp_lun), 0);
 619
 620         put_device(&unit->dev);
 621 }
 622
 623 struct fc_function_template zfcp_transport_functions = {
 624         .show_starget_port_id = 1,
 625         .show_starget_port_name = 1,
 626         .show_starget_node_name = 1,
 627         .show_rport_supported_classes = 1,
 628         .show_rport_maxframe_size = 1,
 629         .show_rport_dev_loss_tmo = 1,
 630         .show_host_node_name = 1,
 631         .show_host_port_name = 1,
 632         .show_host_permanent_port_name = 1,
 633         .show_host_supported_classes = 1,
 634         .show_host_supported_fc4s = 1,
 635         .show_host_supported_speeds = 1,
 636         .show_host_maxframe_size = 1,
 637         .show_host_serial_number = 1,
 638         .get_fc_host_stats = zfcp_get_fc_host_stats,
 639         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 640         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 641         .get_host_port_state = zfcp_get_host_port_state,
 642         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 643         .show_host_port_state = 1,
 644         .show_host_active_fc4s = 1,
 645         .bsg_request = zfcp_fc_exec_bsg_job,
 646         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 647         /* no functions registered for following dynamic attributes but
 648            directly set by LLDD */
 649         .show_host_port_type = 1,
 650         .show_host_speed = 1,
 651         .show_host_port_id = 1,
 652         .disable_target_scan = 1,
 653         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 654 };
 655
 656 struct zfcp_data zfcp_data = {
 657         .scsi_host_template = {
 658                 .name                    = "zfcp",
 659                 .module                  = THIS_MODULE,
 660                 .proc_name               = "zfcp",
 661                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 662                 .slave_alloc             = zfcp_scsi_slave_alloc,
 663                 .slave_configure         = zfcp_scsi_slave_configure,
 664                 .slave_destroy           = zfcp_scsi_slave_destroy,
 665                 .queuecommand            = zfcp_scsi_queuecommand,
 666                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 667                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 668                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 669                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 670                 .can_queue               = 4096,
 671                 .this_id                 = -1,
 672                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 673                 .cmd_per_lun             = 1,
 674                 .use_clustering          = 1,
 675                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 676                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 677                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 678         },
 679 };