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 <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 #include "zfcp_reqlist.h"
  19
  20 static unsigned int default_depth = 32;
  21 module_param_named(queue_depth, default_depth, uint, 0600);
  22 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  23
  24 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  25                                         int reason)
  26 {
  27         switch (reason) {
  28         case SCSI_QDEPTH_DEFAULT:
  29                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  30                 break;
  31         case SCSI_QDEPTH_QFULL:
  32                 scsi_track_queue_full(sdev, depth);
  33                 break;
  34         case SCSI_QDEPTH_RAMP_UP:
  35                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  36                 break;
  37         default:
  38                 return -EOPNOTSUPP;
  39         }
  40         return sdev->queue_depth;
  41 }
  42
  43 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  44 {
  45         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  46         unit->device = NULL;
  47         put_device(&unit->dev);
  48 }
  49
  50 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  51 {
  52         if (sdp->tagged_supported)
  53                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  54         else
  55                 scsi_adjust_queue_depth(sdp, 0, 1);
  56         return 0;
  57 }
  58
  59 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  60 {
  61         struct zfcp_adapter *adapter =
  62                 (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  63
  64         set_host_byte(scpnt, result);
  65         zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
  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         scsi_result = fc_remote_port_chkready(rport);
  90         if (unlikely(scsi_result)) {
  91                 scpnt->result = scsi_result;
  92                 zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
  93                 scpnt->scsi_done(scpnt);
  94                 return 0;
  95         }
  96
  97         status = atomic_read(&unit->status);
  98         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  99                      !(atomic_read(&unit->port->status) &
 100                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 101                 /* only unit access denied, but port is good
 102                  * not covered by FC transport, have to fail here */
 103                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 104                 return 0;
 105         }
 106
 107         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 108                 /* This could be either
 109                  * open unit pending: this is temporary, will result in
 110                  *      open unit or ERP_FAILED, so retry command
 111                  * call to rport_delete pending: mimic retry from
 112                  *      fc_remote_port_chkready until rport is BLOCKED
 113                  */
 114                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 115                 return 0;
 116         }
 117
 118         ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
 119         if (unlikely(ret == -EBUSY))
 120                 return SCSI_MLQUEUE_DEVICE_BUSY;
 121         else if (unlikely(ret < 0))
 122                 return SCSI_MLQUEUE_HOST_BUSY;
 123
 124         return ret;
 125 }
 126
 127 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 128                                           unsigned int id, u64 lun)
 129 {
 130         unsigned long flags;
 131         struct zfcp_port *port;
 132         struct zfcp_unit *unit = NULL;
 133
 134         read_lock_irqsave(&adapter->port_list_lock, flags);
 135         list_for_each_entry(port, &adapter->port_list, list) {
 136                 if (!port->rport || (id != port->rport->scsi_target_id))
 137                         continue;
 138                 unit = zfcp_get_unit_by_lun(port, lun);
 139                 if (unit)
 140                         break;
 141         }
 142         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 143
 144         return unit;
 145 }
 146
 147 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 148 {
 149         struct zfcp_adapter *adapter;
 150         struct zfcp_unit *unit;
 151         u64 lun;
 152
 153         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 154         if (!adapter)
 155                 goto out;
 156
 157         int_to_scsilun(sdp->lun, (struct scsi_lun *)&lun);
 158         unit = zfcp_unit_lookup(adapter, sdp->id, lun);
 159         if (unit) {
 160                 sdp->hostdata = unit;
 161                 unit->device = sdp;
 162                 return 0;
 163         }
 164 out:
 165         return -ENXIO;
 166 }
 167
 168 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 169 {
 170         struct Scsi_Host *scsi_host = scpnt->device->host;
 171         struct zfcp_adapter *adapter =
 172                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 173         struct zfcp_unit *unit = scpnt->device->hostdata;
 174         struct zfcp_fsf_req *old_req, *abrt_req;
 175         unsigned long flags;
 176         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 177         int retval = SUCCESS;
 178         int retry = 3;
 179         char *dbf_tag;
 180
 181         /* avoid race condition between late normal completion and abort */
 182         write_lock_irqsave(&adapter->abort_lock, flags);
 183
 184         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 185         if (!old_req) {
 186                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 187                 zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
 188                                     old_reqid);
 189                 return FAILED; /* completion could be in progress */
 190         }
 191         old_req->data = NULL;
 192
 193         /* don't access old fsf_req after releasing the abort_lock */
 194         write_unlock_irqrestore(&adapter->abort_lock, flags);
 195
 196         while (retry--) {
 197                 abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
 198                 if (abrt_req)
 199                         break;
 200
 201                 zfcp_erp_wait(adapter);
 202                 fc_block_scsi_eh(scpnt);
 203                 if (!(atomic_read(&adapter->status) &
 204                       ZFCP_STATUS_COMMON_RUNNING)) {
 205                         zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
 206                                             old_reqid);
 207                         return SUCCESS;
 208                 }
 209         }
 210         if (!abrt_req)
 211                 return FAILED;
 212
 213         wait_for_completion(&abrt_req->completion);
 214
 215         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 216                 dbf_tag = "okay";
 217         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 218                 dbf_tag = "lte2";
 219         else {
 220                 dbf_tag = "fail";
 221                 retval = FAILED;
 222         }
 223         zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
 224         zfcp_fsf_req_free(abrt_req);
 225         return retval;
 226 }
 227
 228 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 229 {
 230         struct zfcp_unit *unit = scpnt->device->hostdata;
 231         struct zfcp_adapter *adapter = unit->port->adapter;
 232         struct zfcp_fsf_req *fsf_req = NULL;
 233         int retval = SUCCESS;
 234         int retry = 3;
 235
 236         while (retry--) {
 237                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 238                 if (fsf_req)
 239                         break;
 240
 241                 zfcp_erp_wait(adapter);
 242                 fc_block_scsi_eh(scpnt);
 243                 if (!(atomic_read(&adapter->status) &
 244                       ZFCP_STATUS_COMMON_RUNNING)) {
 245                         zfcp_dbf_scsi_devreset("nres", tm_flags, unit, scpnt);
 246                         return SUCCESS;
 247                 }
 248         }
 249         if (!fsf_req)
 250                 return FAILED;
 251
 252         wait_for_completion(&fsf_req->completion);
 253
 254         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 255                 zfcp_dbf_scsi_devreset("fail", tm_flags, unit, scpnt);
 256                 retval = FAILED;
 257         } else
 258                 zfcp_dbf_scsi_devreset("okay", tm_flags, unit, scpnt);
 259
 260         zfcp_fsf_req_free(fsf_req);
 261         return retval;
 262 }
 263
 264 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 265 {
 266         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 267 }
 268
 269 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 270 {
 271         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 272 }
 273
 274 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 275 {
 276         struct zfcp_unit *unit = scpnt->device->hostdata;
 277         struct zfcp_adapter *adapter = unit->port->adapter;
 278
 279         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 280         zfcp_erp_wait(adapter);
 281         fc_block_scsi_eh(scpnt);
 282
 283         return SUCCESS;
 284 }
 285
 286 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 287 {
 288         struct ccw_dev_id dev_id;
 289
 290         if (adapter->scsi_host)
 291                 return 0;
 292
 293         ccw_device_get_id(adapter->ccw_device, &dev_id);
 294         /* register adapter as SCSI host with mid layer of SCSI stack */
 295         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 296                                              sizeof (struct zfcp_adapter *));
 297         if (!adapter->scsi_host) {
 298                 dev_err(&adapter->ccw_device->dev,
 299                         "Registering the FCP device with the "
 300                         "SCSI stack failed\n");
 301                 return -EIO;
 302         }
 303
 304         /* tell the SCSI stack some characteristics of this adapter */
 305         adapter->scsi_host->max_id = 1;
 306         adapter->scsi_host->max_lun = 1;
 307         adapter->scsi_host->max_channel = 0;
 308         adapter->scsi_host->unique_id = dev_id.devno;
 309         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 310         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 311
 312         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 313
 314         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 315                 scsi_host_put(adapter->scsi_host);
 316                 return -EIO;
 317         }
 318
 319         return 0;
 320 }
 321
 322 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 323 {
 324         struct Scsi_Host *shost;
 325         struct zfcp_port *port;
 326
 327         shost = adapter->scsi_host;
 328         if (!shost)
 329                 return;
 330
 331         read_lock_irq(&adapter->port_list_lock);
 332         list_for_each_entry(port, &adapter->port_list, list)
 333                 port->rport = NULL;
 334         read_unlock_irq(&adapter->port_list_lock);
 335
 336         fc_remove_host(shost);
 337         scsi_remove_host(shost);
 338         scsi_host_put(shost);
 339         adapter->scsi_host = NULL;
 340
 341         return;
 342 }
 343
 344 static struct fc_host_statistics*
 345 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 346 {
 347         struct fc_host_statistics *fc_stats;
 348
 349         if (!adapter->fc_stats) {
 350                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 351                 if (!fc_stats)
 352                         return NULL;
 353                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 354         }
 355         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 356         return adapter->fc_stats;
 357 }
 358
 359 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 360                                       struct fsf_qtcb_bottom_port *data,
 361                                       struct fsf_qtcb_bottom_port *old)
 362 {
 363         fc_stats->seconds_since_last_reset =
 364                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 365         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 366         fc_stats->tx_words = data->tx_words - old->tx_words;
 367         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 368         fc_stats->rx_words = data->rx_words - old->rx_words;
 369         fc_stats->lip_count = data->lip - old->lip;
 370         fc_stats->nos_count = data->nos - old->nos;
 371         fc_stats->error_frames = data->error_frames - old->error_frames;
 372         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 373         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 374         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 375         fc_stats->loss_of_signal_count =
 376                 data->loss_of_signal - old->loss_of_signal;
 377         fc_stats->prim_seq_protocol_err_count =
 378                 data->psp_error_counts - old->psp_error_counts;
 379         fc_stats->invalid_tx_word_count =
 380                 data->invalid_tx_words - old->invalid_tx_words;
 381         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 382         fc_stats->fcp_input_requests =
 383                 data->input_requests - old->input_requests;
 384         fc_stats->fcp_output_requests =
 385                 data->output_requests - old->output_requests;
 386         fc_stats->fcp_control_requests =
 387                 data->control_requests - old->control_requests;
 388         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 389         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 390 }
 391
 392 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 393                                    struct fsf_qtcb_bottom_port *data)
 394 {
 395         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 396         fc_stats->tx_frames = data->tx_frames;
 397         fc_stats->tx_words = data->tx_words;
 398         fc_stats->rx_frames = data->rx_frames;
 399         fc_stats->rx_words = data->rx_words;
 400         fc_stats->lip_count = data->lip;
 401         fc_stats->nos_count = data->nos;
 402         fc_stats->error_frames = data->error_frames;
 403         fc_stats->dumped_frames = data->dumped_frames;
 404         fc_stats->link_failure_count = data->link_failure;
 405         fc_stats->loss_of_sync_count = data->loss_of_sync;
 406         fc_stats->loss_of_signal_count = data->loss_of_signal;
 407         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 408         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 409         fc_stats->invalid_crc_count = data->invalid_crcs;
 410         fc_stats->fcp_input_requests = data->input_requests;
 411         fc_stats->fcp_output_requests = data->output_requests;
 412         fc_stats->fcp_control_requests = data->control_requests;
 413         fc_stats->fcp_input_megabytes = data->input_mb;
 414         fc_stats->fcp_output_megabytes = data->output_mb;
 415 }
 416
 417 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 418 {
 419         struct zfcp_adapter *adapter;
 420         struct fc_host_statistics *fc_stats;
 421         struct fsf_qtcb_bottom_port *data;
 422         int ret;
 423
 424         adapter = (struct zfcp_adapter *)host->hostdata[0];
 425         fc_stats = zfcp_init_fc_host_stats(adapter);
 426         if (!fc_stats)
 427                 return NULL;
 428
 429         data = kzalloc(sizeof(*data), GFP_KERNEL);
 430         if (!data)
 431                 return NULL;
 432
 433         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 434         if (ret) {
 435                 kfree(data);
 436                 return NULL;
 437         }
 438
 439         if (adapter->stats_reset &&
 440             ((jiffies/HZ - adapter->stats_reset) <
 441              data->seconds_since_last_reset))
 442                 zfcp_adjust_fc_host_stats(fc_stats, data,
 443                                           adapter->stats_reset_data);
 444         else
 445                 zfcp_set_fc_host_stats(fc_stats, data);
 446
 447         kfree(data);
 448         return fc_stats;
 449 }
 450
 451 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 452 {
 453         struct zfcp_adapter *adapter;
 454         struct fsf_qtcb_bottom_port *data;
 455         int ret;
 456
 457         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 458         data = kzalloc(sizeof(*data), GFP_KERNEL);
 459         if (!data)
 460                 return;
 461
 462         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 463         if (ret)
 464                 kfree(data);
 465         else {
 466                 adapter->stats_reset = jiffies/HZ;
 467                 kfree(adapter->stats_reset_data);
 468                 adapter->stats_reset_data = data; /* finally freed in
 469                                                      adapter_release */
 470         }
 471 }
 472
 473 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 474 {
 475         struct zfcp_adapter *adapter =
 476                 (struct zfcp_adapter *)shost->hostdata[0];
 477         int status = atomic_read(&adapter->status);
 478
 479         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 480             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 481                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 482         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 483                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 484         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 485                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 486         else
 487                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 488 }
 489
 490 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 491 {
 492         rport->dev_loss_tmo = timeout;
 493 }
 494
 495 /**
 496  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 497  * @rport: The FC rport where to teminate I/O
 498  *
 499  * Abort all pending SCSI commands for a port by closing the
 500  * port. Using a reopen avoiding a conflict with a shutdown
 501  * overwriting a reopen.
 502  */
 503 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 504 {
 505         struct zfcp_port *port;
 506         struct Scsi_Host *shost = rport_to_shost(rport);
 507         struct zfcp_adapter *adapter =
 508                 (struct zfcp_adapter *)shost->hostdata[0];
 509
 510         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 511
 512         if (port) {
 513                 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
 514                 put_device(&port->dev);
 515         }
 516 }
 517
 518 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 519 {
 520         struct fc_rport_identifiers ids;
 521         struct fc_rport *rport;
 522
 523         if (port->rport)
 524                 return;
 525
 526         ids.node_name = port->wwnn;
 527         ids.port_name = port->wwpn;
 528         ids.port_id = port->d_id;
 529         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 530
 531         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 532         if (!rport) {
 533                 dev_err(&port->adapter->ccw_device->dev,
 534                         "Registering port 0x%016Lx failed\n",
 535                         (unsigned long long)port->wwpn);
 536                 return;
 537         }
 538
 539         rport->maxframe_size = port->maxframe_size;
 540         rport->supported_classes = port->supported_classes;
 541         port->rport = rport;
 542 }
 543
 544 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 545 {
 546         struct fc_rport *rport = port->rport;
 547
 548         if (rport) {
 549                 fc_remote_port_delete(rport);
 550                 port->rport = NULL;
 551         }
 552 }
 553
 554 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 555 {
 556         get_device(&port->dev);
 557         port->rport_task = RPORT_ADD;
 558
 559         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 560                 put_device(&port->dev);
 561 }
 562
 563 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 564 {
 565         get_device(&port->dev);
 566         port->rport_task = RPORT_DEL;
 567
 568         if (port->rport && queue_work(port->adapter->work_queue,
 569                                       &port->rport_work))
 570                 return;
 571
 572         put_device(&port->dev);
 573 }
 574
 575 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 576 {
 577         unsigned long flags;
 578         struct zfcp_port *port;
 579
 580         read_lock_irqsave(&adapter->port_list_lock, flags);
 581         list_for_each_entry(port, &adapter->port_list, list)
 582                 zfcp_scsi_schedule_rport_block(port);
 583         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 584 }
 585
 586 void zfcp_scsi_rport_work(struct work_struct *work)
 587 {
 588         struct zfcp_port *port = container_of(work, struct zfcp_port,
 589                                               rport_work);
 590
 591         while (port->rport_task) {
 592                 if (port->rport_task == RPORT_ADD) {
 593                         port->rport_task = RPORT_NONE;
 594                         zfcp_scsi_rport_register(port);
 595                 } else {
 596                         port->rport_task = RPORT_NONE;
 597                         zfcp_scsi_rport_block(port);
 598                 }
 599         }
 600
 601         put_device(&port->dev);
 602 }
 603
 604
 605 void zfcp_scsi_scan(struct work_struct *work)
 606 {
 607         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 608                                               scsi_work);
 609         struct fc_rport *rport;
 610
 611         flush_work(&unit->port->rport_work);
 612         rport = unit->port->rport;
 613
 614         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 615                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 616                                  scsilun_to_int((struct scsi_lun *)
 617                                                 &unit->fcp_lun), 0);
 618
 619         put_device(&unit->dev);
 620 }
 621
 622 struct fc_function_template zfcp_transport_functions = {
 623         .show_starget_port_id = 1,
 624         .show_starget_port_name = 1,
 625         .show_starget_node_name = 1,
 626         .show_rport_supported_classes = 1,
 627         .show_rport_maxframe_size = 1,
 628         .show_rport_dev_loss_tmo = 1,
 629         .show_host_node_name = 1,
 630         .show_host_port_name = 1,
 631         .show_host_permanent_port_name = 1,
 632         .show_host_supported_classes = 1,
 633         .show_host_supported_fc4s = 1,
 634         .show_host_supported_speeds = 1,
 635         .show_host_maxframe_size = 1,
 636         .show_host_serial_number = 1,
 637         .get_fc_host_stats = zfcp_get_fc_host_stats,
 638         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 639         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 640         .get_host_port_state = zfcp_get_host_port_state,
 641         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 642         .show_host_port_state = 1,
 643         .show_host_active_fc4s = 1,
 644         .bsg_request = zfcp_fc_exec_bsg_job,
 645         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 646         /* no functions registered for following dynamic attributes but
 647            directly set by LLDD */
 648         .show_host_port_type = 1,
 649         .show_host_speed = 1,
 650         .show_host_port_id = 1,
 651         .disable_target_scan = 1,
 652         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 653 };
 654
 655 struct zfcp_data zfcp_data = {
 656         .scsi_host_template = {
 657                 .name                    = "zfcp",
 658                 .module                  = THIS_MODULE,
 659                 .proc_name               = "zfcp",
 660                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 661                 .slave_alloc             = zfcp_scsi_slave_alloc,
 662                 .slave_configure         = zfcp_scsi_slave_configure,
 663                 .slave_destroy           = zfcp_scsi_slave_destroy,
 664                 .queuecommand            = zfcp_scsi_queuecommand,
 665                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 666                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 667                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 668                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 669                 .can_queue               = 4096,
 670                 .this_id                 = -1,
 671                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 672                 .cmd_per_lun             = 1,
 673                 .use_clustering          = 1,
 674                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 675                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 676                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 677         },
 678 };