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 <asm/atomic.h>
  13 #include "zfcp_ext.h"
  14 #include "zfcp_dbf.h"
  15
  16 static unsigned int default_depth = 32;
  17 module_param_named(queue_depth, default_depth, uint, 0600);
  18 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  19
  20 /* Find start of Sense Information in FCP response unit*/
  21 char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  22 {
  23         char *fcp_sns_info_ptr;
  24
  25         fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
  26         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  27                 fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
  28
  29         return fcp_sns_info_ptr;
  30 }
  31
  32 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth)
  33 {
  34         scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  35         return sdev->queue_depth;
  36 }
  37
  38 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  39 {
  40         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  41         unit->device = NULL;
  42         zfcp_unit_put(unit);
  43 }
  44
  45 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  46 {
  47         if (sdp->tagged_supported)
  48                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  49         else
  50                 scsi_adjust_queue_depth(sdp, 0, 1);
  51         return 0;
  52 }
  53
  54 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  55 {
  56         set_host_byte(scpnt, result);
  57         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
  58                 zfcp_scsi_dbf_event_result("fail", 4,
  59                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
  60                         scpnt, NULL);
  61         /* return directly */
  62         scpnt->scsi_done(scpnt);
  63 }
  64
  65 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  66                                   void (*done) (struct scsi_cmnd *))
  67 {
  68         struct zfcp_unit *unit;
  69         struct zfcp_adapter *adapter;
  70         int    status, scsi_result, ret;
  71         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  72
  73         /* reset the status for this request */
  74         scpnt->result = 0;
  75         scpnt->host_scribble = NULL;
  76         scpnt->scsi_done = done;
  77
  78         /*
  79          * figure out adapter and target device
  80          * (stored there by zfcp_scsi_slave_alloc)
  81          */
  82         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  83         unit = scpnt->device->hostdata;
  84
  85         BUG_ON(!adapter || (adapter != unit->port->adapter));
  86         BUG_ON(!scpnt->scsi_done);
  87
  88         if (unlikely(!unit)) {
  89                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  90                 return 0;
  91         }
  92
  93         scsi_result = fc_remote_port_chkready(rport);
  94         if (unlikely(scsi_result)) {
  95                 scpnt->result = scsi_result;
  96                 zfcp_scsi_dbf_event_result("fail", 4, adapter, scpnt, NULL);
  97                 scpnt->scsi_done(scpnt);
  98                 return 0;
  99         }
 100
 101         status = atomic_read(&unit->status);
 102         if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
 103                      !(status & ZFCP_STATUS_COMMON_RUNNING))) {
 104                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 105                 return 0;;
 106         }
 107
 108         ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
 109         if (unlikely(ret == -EBUSY))
 110                 return SCSI_MLQUEUE_DEVICE_BUSY;
 111         else if (unlikely(ret < 0))
 112                 return SCSI_MLQUEUE_HOST_BUSY;
 113
 114         return ret;
 115 }
 116
 117 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 118                                           int channel, unsigned int id,
 119                                           unsigned int lun)
 120 {
 121         struct zfcp_port *port;
 122         struct zfcp_unit *unit;
 123         int scsi_lun;
 124
 125         list_for_each_entry(port, &adapter->port_list_head, list) {
 126                 if (!port->rport || (id != port->rport->scsi_target_id))
 127                         continue;
 128                 list_for_each_entry(unit, &port->unit_list_head, list) {
 129                         scsi_lun = scsilun_to_int(
 130                                 (struct scsi_lun *)&unit->fcp_lun);
 131                         if (lun == scsi_lun)
 132                                 return unit;
 133                 }
 134         }
 135
 136         return NULL;
 137 }
 138
 139 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 140 {
 141         struct zfcp_adapter *adapter;
 142         struct zfcp_unit *unit;
 143         unsigned long flags;
 144         int retval = -ENXIO;
 145
 146         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 147         if (!adapter)
 148                 goto out;
 149
 150         read_lock_irqsave(&zfcp_data.config_lock, flags);
 151         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 152         if (unit) {
 153                 sdp->hostdata = unit;
 154                 unit->device = sdp;
 155                 zfcp_unit_get(unit);
 156                 retval = 0;
 157         }
 158         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 159 out:
 160         return retval;
 161 }
 162
 163 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 164 {
 165         struct Scsi_Host *scsi_host = scpnt->device->host;
 166         struct zfcp_adapter *adapter =
 167                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 168         struct zfcp_unit *unit = scpnt->device->hostdata;
 169         struct zfcp_fsf_req *old_req, *abrt_req;
 170         unsigned long flags;
 171         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 172         int retval = SUCCESS;
 173         int retry = 3;
 174         char *dbf_tag;
 175
 176         /* avoid race condition between late normal completion and abort */
 177         write_lock_irqsave(&adapter->abort_lock, flags);
 178
 179         spin_lock(&adapter->req_list_lock);
 180         old_req = zfcp_reqlist_find(adapter, old_reqid);
 181         spin_unlock(&adapter->req_list_lock);
 182         if (!old_req) {
 183                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 184                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL,
 185                                           old_reqid);
 186                 return FAILED; /* completion could be in progress */
 187         }
 188         old_req->data = NULL;
 189
 190         /* don't access old fsf_req after releasing the abort_lock */
 191         write_unlock_irqrestore(&adapter->abort_lock, flags);
 192
 193         while (retry--) {
 194                 abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
 195                 if (abrt_req)
 196                         break;
 197
 198                 zfcp_erp_wait(adapter);
 199                 if (!(atomic_read(&adapter->status) &
 200                       ZFCP_STATUS_COMMON_RUNNING)) {
 201                         zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 202                                                   old_reqid);
 203                         return SUCCESS;
 204                 }
 205         }
 206         if (!abrt_req)
 207                 return FAILED;
 208
 209         wait_event(abrt_req->completion_wq,
 210                    abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 211
 212         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 213                 dbf_tag = "okay";
 214         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 215                 dbf_tag = "lte2";
 216         else {
 217                 dbf_tag = "fail";
 218                 retval = FAILED;
 219         }
 220         zfcp_scsi_dbf_event_abort(dbf_tag, adapter, scpnt, abrt_req, old_reqid);
 221         zfcp_fsf_req_free(abrt_req);
 222         return retval;
 223 }
 224
 225 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 226 {
 227         struct zfcp_unit *unit = scpnt->device->hostdata;
 228         struct zfcp_adapter *adapter = unit->port->adapter;
 229         struct zfcp_fsf_req *fsf_req;
 230         int retval = SUCCESS;
 231         int retry = 3;
 232
 233         while (retry--) {
 234                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 235                 if (fsf_req)
 236                         break;
 237
 238                 zfcp_erp_wait(adapter);
 239                 if (!(atomic_read(&adapter->status) &
 240                       ZFCP_STATUS_COMMON_RUNNING)) {
 241                         zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit,
 242                                                      scpnt);
 243                         return SUCCESS;
 244                 }
 245         }
 246         if (!fsf_req)
 247                 return FAILED;
 248
 249         wait_event(fsf_req->completion_wq,
 250                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 251
 252         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 253                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 254                 retval = FAILED;
 255         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 256                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 257                 retval = FAILED;
 258         } else
 259                 zfcp_scsi_dbf_event_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_LOGICAL_UNIT_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_TARGET_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
 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 = 255;
 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(&zfcp_data.config_lock);
 332         list_for_each_entry(port, &adapter->port_list_head, list)
 333                 if (port->rport)
 334                         port->rport = NULL;
 335
 336         read_unlock_irq(&zfcp_data.config_lock);
 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 adater_dequeue */
 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, 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, 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_dequeue */
 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_dev_loss_tmo_callbk - Free any reference to rport
 498  * @rport: The rport that is about to be deleted.
 499  */
 500 static void zfcp_scsi_dev_loss_tmo_callbk(struct fc_rport *rport)
 501 {
 502         struct zfcp_port *port;
 503
 504         write_lock_irq(&zfcp_data.config_lock);
 505         port = rport->dd_data;
 506         if (port)
 507                 port->rport = NULL;
 508         write_unlock_irq(&zfcp_data.config_lock);
 509 }
 510
 511 /**
 512  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 513  * @rport: The FC rport where to teminate I/O
 514  *
 515  * Abort all pending SCSI commands for a port by closing the
 516  * port. Using a reopen for avoids a conflict with a shutdown
 517  * overwriting a reopen.
 518  */
 519 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 520 {
 521         struct zfcp_port *port;
 522
 523         write_lock_irq(&zfcp_data.config_lock);
 524         port = rport->dd_data;
 525         if (port)
 526                 zfcp_port_get(port);
 527         write_unlock_irq(&zfcp_data.config_lock);
 528
 529         if (port) {
 530                 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
 531                 zfcp_port_put(port);
 532         }
 533 }
 534
 535 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 536 {
 537         struct fc_rport_identifiers ids;
 538         struct fc_rport *rport;
 539
 540         if (port->rport)
 541                 return;
 542
 543         ids.node_name = port->wwnn;
 544         ids.port_name = port->wwpn;
 545         ids.port_id = port->d_id;
 546         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 547
 548         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 549         if (!rport) {
 550                 dev_err(&port->adapter->ccw_device->dev,
 551                         "Registering port 0x%016Lx failed\n",
 552                         (unsigned long long)port->wwpn);
 553                 return;
 554         }
 555
 556         rport->dd_data = port;
 557         rport->maxframe_size = port->maxframe_size;
 558         rport->supported_classes = port->supported_classes;
 559         port->rport = rport;
 560 }
 561
 562 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 563 {
 564         struct fc_rport *rport = port->rport;
 565
 566         if (rport) {
 567                 fc_remote_port_delete(rport);
 568                 port->rport = NULL;
 569         }
 570 }
 571
 572 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 573 {
 574         zfcp_port_get(port);
 575         port->rport_task = RPORT_ADD;
 576
 577         if (!queue_work(zfcp_data.work_queue, &port->rport_work))
 578                 zfcp_port_put(port);
 579 }
 580
 581 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 582 {
 583         zfcp_port_get(port);
 584         port->rport_task = RPORT_DEL;
 585
 586         if (port->rport && queue_work(zfcp_data.work_queue, &port->rport_work))
 587                 return;
 588
 589         zfcp_port_put(port);
 590 }
 591
 592 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 593 {
 594         struct zfcp_port *port;
 595
 596         list_for_each_entry(port, &adapter->port_list_head, list)
 597                 zfcp_scsi_schedule_rport_block(port);
 598 }
 599
 600 void zfcp_scsi_rport_work(struct work_struct *work)
 601 {
 602         struct zfcp_port *port = container_of(work, struct zfcp_port,
 603                                               rport_work);
 604
 605         while (port->rport_task) {
 606                 if (port->rport_task == RPORT_ADD) {
 607                         port->rport_task = RPORT_NONE;
 608                         zfcp_scsi_rport_register(port);
 609                 } else {
 610                         port->rport_task = RPORT_NONE;
 611                         zfcp_scsi_rport_block(port);
 612                 }
 613         }
 614
 615         zfcp_port_put(port);
 616 }
 617
 618
 619 void zfcp_scsi_scan(struct work_struct *work)
 620 {
 621         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 622                                               scsi_work);
 623         struct fc_rport *rport;
 624
 625         flush_work(&unit->port->rport_work);
 626         rport = unit->port->rport;
 627
 628         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 629                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 630                                  scsilun_to_int((struct scsi_lun *)
 631                                                 &unit->fcp_lun), 0);
 632
 633         zfcp_unit_put(unit);
 634 }
 635
 636 static int zfcp_execute_fc_job(struct fc_bsg_job *job)
 637 {
 638         switch (job->request->msgcode) {
 639         case FC_BSG_RPT_ELS:
 640         case FC_BSG_HST_ELS_NOLOGIN:
 641                 return zfcp_fc_execute_els_fc_job(job);
 642         case FC_BSG_RPT_CT:
 643         case FC_BSG_HST_CT:
 644                 return zfcp_fc_execute_ct_fc_job(job);
 645         default:
 646                 return -EINVAL;
 647         }
 648 }
 649
 650 struct fc_function_template zfcp_transport_functions = {
 651         .show_starget_port_id = 1,
 652         .show_starget_port_name = 1,
 653         .show_starget_node_name = 1,
 654         .show_rport_supported_classes = 1,
 655         .show_rport_maxframe_size = 1,
 656         .show_rport_dev_loss_tmo = 1,
 657         .show_host_node_name = 1,
 658         .show_host_port_name = 1,
 659         .show_host_permanent_port_name = 1,
 660         .show_host_supported_classes = 1,
 661         .show_host_supported_speeds = 1,
 662         .show_host_maxframe_size = 1,
 663         .show_host_serial_number = 1,
 664         .get_fc_host_stats = zfcp_get_fc_host_stats,
 665         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 666         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 667         .get_host_port_state = zfcp_get_host_port_state,
 668         .dev_loss_tmo_callbk = zfcp_scsi_dev_loss_tmo_callbk,
 669         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 670         .show_host_port_state = 1,
 671         .bsg_request = zfcp_execute_fc_job,
 672         /* no functions registered for following dynamic attributes but
 673            directly set by LLDD */
 674         .show_host_port_type = 1,
 675         .show_host_speed = 1,
 676         .show_host_port_id = 1,
 677         .disable_target_scan = 1,
 678 };
 679
 680 struct zfcp_data zfcp_data = {
 681         .scsi_host_template = {
 682                 .name                    = "zfcp",
 683                 .module                  = THIS_MODULE,
 684                 .proc_name               = "zfcp",
 685                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 686                 .slave_alloc             = zfcp_scsi_slave_alloc,
 687                 .slave_configure         = zfcp_scsi_slave_configure,
 688                 .slave_destroy           = zfcp_scsi_slave_destroy,
 689                 .queuecommand            = zfcp_scsi_queuecommand,
 690                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 691                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 692                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 693                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 694                 .can_queue               = 4096,
 695                 .this_id                 = -1,
 696                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 697                 .cmd_per_lun             = 1,
 698                 .use_clustering          = 1,
 699                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 700                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 701                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 702         },
 703 };