SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 <linux/types.h>
  13 #include <scsi/fc/fc_fcp.h>
  14 #include <asm/atomic.h>
  15 #include "zfcp_ext.h"
  16 #include "zfcp_dbf.h"
  17 #include "zfcp_fc.h"
  18
  19 static unsigned int default_depth = 32;
  20 module_param_named(queue_depth, default_depth, uint, 0600);
  21 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  22
  23 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  24                                         int reason)
  25 {
  26         switch (reason) {
  27         case SCSI_QDEPTH_DEFAULT:
  28                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  29                 break;
  30         case SCSI_QDEPTH_QFULL:
  31                 scsi_track_queue_full(sdev, depth);
  32                 break;
  33         case SCSI_QDEPTH_RAMP_UP:
  34                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  35                 break;
  36         default:
  37                 return -EOPNOTSUPP;
  38         }
  39         return sdev->queue_depth;
  40 }
  41
  42 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  43 {
  44         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  45         unit->device = NULL;
  46         put_device(&unit->sysfs_device);
  47 }
  48
  49 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  50 {
  51         if (sdp->tagged_supported)
  52                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  53         else
  54                 scsi_adjust_queue_depth(sdp, 0, 1);
  55         return 0;
  56 }
  57
  58 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  59 {
  60         struct zfcp_adapter *adapter =
  61                 (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  62         set_host_byte(scpnt, result);
  63         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
  64                 zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL);
  65         /* return directly */
  66         scpnt->scsi_done(scpnt);
  67 }
  68
  69 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  70                                   void (*done) (struct scsi_cmnd *))
  71 {
  72         struct zfcp_unit *unit;
  73         struct zfcp_adapter *adapter;
  74         int    status, scsi_result, ret;
  75         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  76
  77         /* reset the status for this request */
  78         scpnt->result = 0;
  79         scpnt->host_scribble = NULL;
  80         scpnt->scsi_done = done;
  81
  82         /*
  83          * figure out adapter and target device
  84          * (stored there by zfcp_scsi_slave_alloc)
  85          */
  86         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  87         unit = scpnt->device->hostdata;
  88
  89         BUG_ON(!adapter || (adapter != unit->port->adapter));
  90         BUG_ON(!scpnt->scsi_done);
  91
  92         if (unlikely(!unit)) {
  93                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  94                 return 0;
  95         }
  96
  97         scsi_result = fc_remote_port_chkready(rport);
  98         if (unlikely(scsi_result)) {
  99                 scpnt->result = scsi_result;
 100                 zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL);
 101                 scpnt->scsi_done(scpnt);
 102                 return 0;
 103         }
 104
 105         status = atomic_read(&unit->status);
 106         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 107                      !(atomic_read(&unit->port->status) &
 108                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 109                 /* only unit access denied, but port is good
 110                  * not covered by FC transport, have to fail here */
 111                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 112                 return 0;
 113         }
 114
 115         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 116                 /* This could be either
 117                  * open unit pending: this is temporary, will result in
 118                  *      open unit or ERP_FAILED, so retry command
 119                  * call to rport_delete pending: mimic retry from
 120                  *      fc_remote_port_chkready until rport is BLOCKED
 121                  */
 122                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 123                 return 0;
 124         }
 125
 126         ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
 127         if (unlikely(ret == -EBUSY))
 128                 return SCSI_MLQUEUE_DEVICE_BUSY;
 129         else if (unlikely(ret < 0))
 130                 return SCSI_MLQUEUE_HOST_BUSY;
 131
 132         return ret;
 133 }
 134
 135 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 136                                           unsigned int id, u64 lun)
 137 {
 138         unsigned long flags;
 139         struct zfcp_port *port;
 140         struct zfcp_unit *unit = NULL;
 141
 142         read_lock_irqsave(&adapter->port_list_lock, flags);
 143         list_for_each_entry(port, &adapter->port_list, list) {
 144                 if (!port->rport || (id != port->rport->scsi_target_id))
 145                         continue;
 146                 unit = zfcp_get_unit_by_lun(port, lun);
 147                 if (unit)
 148                         break;
 149         }
 150         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 151
 152         return unit;
 153 }
 154
 155 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 156 {
 157         struct zfcp_adapter *adapter;
 158         struct zfcp_unit *unit;
 159         u64 lun;
 160
 161         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 162         if (!adapter)
 163                 goto out;
 164
 165         int_to_scsilun(sdp->lun, (struct scsi_lun *)&lun);
 166         unit = zfcp_unit_lookup(adapter, sdp->id, lun);
 167         if (unit) {
 168                 sdp->hostdata = unit;
 169                 unit->device = sdp;
 170                 return 0;
 171         }
 172 out:
 173         return -ENXIO;
 174 }
 175
 176 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 177 {
 178         struct Scsi_Host *scsi_host = scpnt->device->host;
 179         struct zfcp_adapter *adapter =
 180                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 181         struct zfcp_unit *unit = scpnt->device->hostdata;
 182         struct zfcp_fsf_req *old_req, *abrt_req;
 183         unsigned long flags;
 184         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 185         int retval = SUCCESS;
 186         int retry = 3;
 187         char *dbf_tag;
 188
 189         /* avoid race condition between late normal completion and abort */
 190         write_lock_irqsave(&adapter->abort_lock, flags);
 191
 192         spin_lock(&adapter->req_list_lock);
 193         old_req = zfcp_reqlist_find(adapter, old_reqid);
 194         spin_unlock(&adapter->req_list_lock);
 195         if (!old_req) {
 196                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 197                 zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
 198                                     old_reqid);
 199                 return FAILED; /* completion could be in progress */
 200         }
 201         old_req->data = NULL;
 202
 203         /* don't access old fsf_req after releasing the abort_lock */
 204         write_unlock_irqrestore(&adapter->abort_lock, flags);
 205
 206         while (retry--) {
 207                 abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
 208                 if (abrt_req)
 209                         break;
 210
 211                 zfcp_erp_wait(adapter);
 212                 fc_block_scsi_eh(scpnt);
 213                 if (!(atomic_read(&adapter->status) &
 214                       ZFCP_STATUS_COMMON_RUNNING)) {
 215                         zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
 216                                             old_reqid);
 217                         return SUCCESS;
 218                 }
 219         }
 220         if (!abrt_req)
 221                 return FAILED;
 222
 223         wait_for_completion(&abrt_req->completion);
 224
 225         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 226                 dbf_tag = "okay";
 227         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 228                 dbf_tag = "lte2";
 229         else {
 230                 dbf_tag = "fail";
 231                 retval = FAILED;
 232         }
 233         zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
 234         zfcp_fsf_req_free(abrt_req);
 235         return retval;
 236 }
 237
 238 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 239 {
 240         struct zfcp_unit *unit = scpnt->device->hostdata;
 241         struct zfcp_adapter *adapter = unit->port->adapter;
 242         struct zfcp_fsf_req *fsf_req = NULL;
 243         int retval = SUCCESS;
 244         int retry = 3;
 245
 246         while (retry--) {
 247                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 248                 if (fsf_req)
 249                         break;
 250
 251                 zfcp_erp_wait(adapter);
 252                 fc_block_scsi_eh(scpnt);
 253                 if (!(atomic_read(&adapter->status) &
 254                       ZFCP_STATUS_COMMON_RUNNING)) {
 255                         zfcp_dbf_scsi_devreset("nres", tm_flags, unit, scpnt);
 256                         return SUCCESS;
 257                 }
 258         }
 259         if (!fsf_req)
 260                 return FAILED;
 261
 262         wait_for_completion(&fsf_req->completion);
 263
 264         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 265                 zfcp_dbf_scsi_devreset("fail", tm_flags, unit, scpnt);
 266                 retval = FAILED;
 267         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 268                 zfcp_dbf_scsi_devreset("nsup", tm_flags, unit, scpnt);
 269                 retval = FAILED;
 270         } else
 271                 zfcp_dbf_scsi_devreset("okay", tm_flags, unit, scpnt);
 272
 273         zfcp_fsf_req_free(fsf_req);
 274         return retval;
 275 }
 276
 277 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 278 {
 279         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 280 }
 281
 282 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 283 {
 284         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 285 }
 286
 287 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 288 {
 289         struct zfcp_unit *unit = scpnt->device->hostdata;
 290         struct zfcp_adapter *adapter = unit->port->adapter;
 291
 292         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 293         zfcp_erp_wait(adapter);
 294         fc_block_scsi_eh(scpnt);
 295
 296         return SUCCESS;
 297 }
 298
 299 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 300 {
 301         struct ccw_dev_id dev_id;
 302
 303         if (adapter->scsi_host)
 304                 return 0;
 305
 306         ccw_device_get_id(adapter->ccw_device, &dev_id);
 307         /* register adapter as SCSI host with mid layer of SCSI stack */
 308         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 309                                              sizeof (struct zfcp_adapter *));
 310         if (!adapter->scsi_host) {
 311                 dev_err(&adapter->ccw_device->dev,
 312                         "Registering the FCP device with the "
 313                         "SCSI stack failed\n");
 314                 return -EIO;
 315         }
 316
 317         /* tell the SCSI stack some characteristics of this adapter */
 318         adapter->scsi_host->max_id = 1;
 319         adapter->scsi_host->max_lun = 1;
 320         adapter->scsi_host->max_channel = 0;
 321         adapter->scsi_host->unique_id = dev_id.devno;
 322         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 323         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 324
 325         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 326
 327         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 328                 scsi_host_put(adapter->scsi_host);
 329                 return -EIO;
 330         }
 331
 332         return 0;
 333 }
 334
 335 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 336 {
 337         struct Scsi_Host *shost;
 338         struct zfcp_port *port;
 339
 340         shost = adapter->scsi_host;
 341         if (!shost)
 342                 return;
 343
 344         read_lock_irq(&adapter->port_list_lock);
 345         list_for_each_entry(port, &adapter->port_list, list)
 346                 port->rport = NULL;
 347         read_unlock_irq(&adapter->port_list_lock);
 348
 349         fc_remove_host(shost);
 350         scsi_remove_host(shost);
 351         scsi_host_put(shost);
 352         adapter->scsi_host = NULL;
 353
 354         return;
 355 }
 356
 357 static struct fc_host_statistics*
 358 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 359 {
 360         struct fc_host_statistics *fc_stats;
 361
 362         if (!adapter->fc_stats) {
 363                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 364                 if (!fc_stats)
 365                         return NULL;
 366                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 367         }
 368         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 369         return adapter->fc_stats;
 370 }
 371
 372 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 373                                       struct fsf_qtcb_bottom_port *data,
 374                                       struct fsf_qtcb_bottom_port *old)
 375 {
 376         fc_stats->seconds_since_last_reset =
 377                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 378         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 379         fc_stats->tx_words = data->tx_words - old->tx_words;
 380         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 381         fc_stats->rx_words = data->rx_words - old->rx_words;
 382         fc_stats->lip_count = data->lip - old->lip;
 383         fc_stats->nos_count = data->nos - old->nos;
 384         fc_stats->error_frames = data->error_frames - old->error_frames;
 385         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 386         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 387         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 388         fc_stats->loss_of_signal_count =
 389                 data->loss_of_signal - old->loss_of_signal;
 390         fc_stats->prim_seq_protocol_err_count =
 391                 data->psp_error_counts - old->psp_error_counts;
 392         fc_stats->invalid_tx_word_count =
 393                 data->invalid_tx_words - old->invalid_tx_words;
 394         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 395         fc_stats->fcp_input_requests =
 396                 data->input_requests - old->input_requests;
 397         fc_stats->fcp_output_requests =
 398                 data->output_requests - old->output_requests;
 399         fc_stats->fcp_control_requests =
 400                 data->control_requests - old->control_requests;
 401         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 402         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 403 }
 404
 405 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 406                                    struct fsf_qtcb_bottom_port *data)
 407 {
 408         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 409         fc_stats->tx_frames = data->tx_frames;
 410         fc_stats->tx_words = data->tx_words;
 411         fc_stats->rx_frames = data->rx_frames;
 412         fc_stats->rx_words = data->rx_words;
 413         fc_stats->lip_count = data->lip;
 414         fc_stats->nos_count = data->nos;
 415         fc_stats->error_frames = data->error_frames;
 416         fc_stats->dumped_frames = data->dumped_frames;
 417         fc_stats->link_failure_count = data->link_failure;
 418         fc_stats->loss_of_sync_count = data->loss_of_sync;
 419         fc_stats->loss_of_signal_count = data->loss_of_signal;
 420         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 421         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 422         fc_stats->invalid_crc_count = data->invalid_crcs;
 423         fc_stats->fcp_input_requests = data->input_requests;
 424         fc_stats->fcp_output_requests = data->output_requests;
 425         fc_stats->fcp_control_requests = data->control_requests;
 426         fc_stats->fcp_input_megabytes = data->input_mb;
 427         fc_stats->fcp_output_megabytes = data->output_mb;
 428 }
 429
 430 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 431 {
 432         struct zfcp_adapter *adapter;
 433         struct fc_host_statistics *fc_stats;
 434         struct fsf_qtcb_bottom_port *data;
 435         int ret;
 436
 437         adapter = (struct zfcp_adapter *)host->hostdata[0];
 438         fc_stats = zfcp_init_fc_host_stats(adapter);
 439         if (!fc_stats)
 440                 return NULL;
 441
 442         data = kzalloc(sizeof(*data), GFP_KERNEL);
 443         if (!data)
 444                 return NULL;
 445
 446         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 447         if (ret) {
 448                 kfree(data);
 449                 return NULL;
 450         }
 451
 452         if (adapter->stats_reset &&
 453             ((jiffies/HZ - adapter->stats_reset) <
 454              data->seconds_since_last_reset))
 455                 zfcp_adjust_fc_host_stats(fc_stats, data,
 456                                           adapter->stats_reset_data);
 457         else
 458                 zfcp_set_fc_host_stats(fc_stats, data);
 459
 460         kfree(data);
 461         return fc_stats;
 462 }
 463
 464 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 465 {
 466         struct zfcp_adapter *adapter;
 467         struct fsf_qtcb_bottom_port *data;
 468         int ret;
 469
 470         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 471         data = kzalloc(sizeof(*data), GFP_KERNEL);
 472         if (!data)
 473                 return;
 474
 475         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 476         if (ret)
 477                 kfree(data);
 478         else {
 479                 adapter->stats_reset = jiffies/HZ;
 480                 kfree(adapter->stats_reset_data);
 481                 adapter->stats_reset_data = data; /* finally freed in
 482                                                      adapter_release */
 483         }
 484 }
 485
 486 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 487 {
 488         struct zfcp_adapter *adapter =
 489                 (struct zfcp_adapter *)shost->hostdata[0];
 490         int status = atomic_read(&adapter->status);
 491
 492         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 493             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 494                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 495         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 496                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 497         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 498                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 499         else
 500                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 501 }
 502
 503 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 504 {
 505         rport->dev_loss_tmo = timeout;
 506 }
 507
 508 /**
 509  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 510  * @rport: The FC rport where to teminate I/O
 511  *
 512  * Abort all pending SCSI commands for a port by closing the
 513  * port. Using a reopen avoiding a conflict with a shutdown
 514  * overwriting a reopen.
 515  */
 516 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 517 {
 518         struct zfcp_port *port;
 519         struct Scsi_Host *shost = rport_to_shost(rport);
 520         struct zfcp_adapter *adapter =
 521                 (struct zfcp_adapter *)shost->hostdata[0];
 522
 523         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 524
 525         if (port) {
 526                 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
 527                 put_device(&port->sysfs_device);
 528         }
 529 }
 530
 531 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 532 {
 533         struct fc_rport_identifiers ids;
 534         struct fc_rport *rport;
 535
 536         if (port->rport)
 537                 return;
 538
 539         ids.node_name = port->wwnn;
 540         ids.port_name = port->wwpn;
 541         ids.port_id = port->d_id;
 542         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 543
 544         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 545         if (!rport) {
 546                 dev_err(&port->adapter->ccw_device->dev,
 547                         "Registering port 0x%016Lx failed\n",
 548                         (unsigned long long)port->wwpn);
 549                 return;
 550         }
 551
 552         rport->maxframe_size = port->maxframe_size;
 553         rport->supported_classes = port->supported_classes;
 554         port->rport = rport;
 555 }
 556
 557 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 558 {
 559         struct fc_rport *rport = port->rport;
 560
 561         if (rport) {
 562                 fc_remote_port_delete(rport);
 563                 port->rport = NULL;
 564         }
 565 }
 566
 567 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 568 {
 569         get_device(&port->sysfs_device);
 570         port->rport_task = RPORT_ADD;
 571
 572         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 573                 put_device(&port->sysfs_device);
 574 }
 575
 576 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 577 {
 578         get_device(&port->sysfs_device);
 579         port->rport_task = RPORT_DEL;
 580
 581         if (port->rport && queue_work(port->adapter->work_queue,
 582                                       &port->rport_work))
 583                 return;
 584
 585         put_device(&port->sysfs_device);
 586 }
 587
 588 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 589 {
 590         unsigned long flags;
 591         struct zfcp_port *port;
 592
 593         read_lock_irqsave(&adapter->port_list_lock, flags);
 594         list_for_each_entry(port, &adapter->port_list, list)
 595                 zfcp_scsi_schedule_rport_block(port);
 596         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 597 }
 598
 599 void zfcp_scsi_rport_work(struct work_struct *work)
 600 {
 601         struct zfcp_port *port = container_of(work, struct zfcp_port,
 602                                               rport_work);
 603
 604         while (port->rport_task) {
 605                 if (port->rport_task == RPORT_ADD) {
 606                         port->rport_task = RPORT_NONE;
 607                         zfcp_scsi_rport_register(port);
 608                 } else {
 609                         port->rport_task = RPORT_NONE;
 610                         zfcp_scsi_rport_block(port);
 611                 }
 612         }
 613
 614         put_device(&port->sysfs_device);
 615 }
 616
 617
 618 void zfcp_scsi_scan(struct work_struct *work)
 619 {
 620         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 621                                               scsi_work);
 622         struct fc_rport *rport;
 623
 624         flush_work(&unit->port->rport_work);
 625         rport = unit->port->rport;
 626
 627         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 628                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 629                                  scsilun_to_int((struct scsi_lun *)
 630                                                 &unit->fcp_lun), 0);
 631
 632         put_device(&unit->sysfs_device);
 633 }
 634
 635 struct fc_function_template zfcp_transport_functions = {
 636         .show_starget_port_id = 1,
 637         .show_starget_port_name = 1,
 638         .show_starget_node_name = 1,
 639         .show_rport_supported_classes = 1,
 640         .show_rport_maxframe_size = 1,
 641         .show_rport_dev_loss_tmo = 1,
 642         .show_host_node_name = 1,
 643         .show_host_port_name = 1,
 644         .show_host_permanent_port_name = 1,
 645         .show_host_supported_classes = 1,
 646         .show_host_supported_speeds = 1,
 647         .show_host_maxframe_size = 1,
 648         .show_host_serial_number = 1,
 649         .get_fc_host_stats = zfcp_get_fc_host_stats,
 650         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 651         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 652         .get_host_port_state = zfcp_get_host_port_state,
 653         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 654         .show_host_port_state = 1,
 655         .bsg_request = zfcp_fc_exec_bsg_job,
 656         /* no functions registered for following dynamic attributes but
 657            directly set by LLDD */
 658         .show_host_port_type = 1,
 659         .show_host_speed = 1,
 660         .show_host_port_id = 1,
 661         .disable_target_scan = 1,
 662         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 663 };
 664
 665 struct zfcp_data zfcp_data = {
 666         .scsi_host_template = {
 667                 .name                    = "zfcp",
 668                 .module                  = THIS_MODULE,
 669                 .proc_name               = "zfcp",
 670                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 671                 .slave_alloc             = zfcp_scsi_slave_alloc,
 672                 .slave_configure         = zfcp_scsi_slave_configure,
 673                 .slave_destroy           = zfcp_scsi_slave_destroy,
 674                 .queuecommand            = zfcp_scsi_queuecommand,
 675                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 676                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 677                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 678                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 679                 .can_queue               = 4096,
 680                 .this_id                 = -1,
 681                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 682                 .cmd_per_lun             = 1,
 683                 .use_clustering          = 1,
 684                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 685                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 686                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 687         },
 688 };