drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13 #include <asm/atomic.h>
  14
  15 static unsigned int default_depth = 32;
  16 module_param_named(queue_depth, default_depth, uint, 0600);
  17 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  18
  19 /* Find start of Sense Information in FCP response unit*/
  20 char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  21 {
  22         char *fcp_sns_info_ptr;
  23
  24         fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
  25         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  26                 fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
  27
  28         return fcp_sns_info_ptr;
  29 }
  30
  31 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth)
  32 {
  33         scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  34         return sdev->queue_depth;
  35 }
  36
  37 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  38 {
  39         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  40         unit->device = NULL;
  41         zfcp_unit_put(unit);
  42 }
  43
  44 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  45 {
  46         if (sdp->tagged_supported)
  47                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  48         else
  49                 scsi_adjust_queue_depth(sdp, 0, 1);
  50         return 0;
  51 }
  52
  53 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  54 {
  55         set_host_byte(scpnt, result);
  56         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
  57                 zfcp_scsi_dbf_event_result("fail", 4,
  58                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
  59                         scpnt, NULL);
  60         /* return directly */
  61         scpnt->scsi_done(scpnt);
  62 }
  63
  64 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  65                                   void (*done) (struct scsi_cmnd *))
  66 {
  67         struct zfcp_unit *unit;
  68         struct zfcp_adapter *adapter;
  69         int    status, scsi_result, ret;
  70         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  71
  72         /* reset the status for this request */
  73         scpnt->result = 0;
  74         scpnt->host_scribble = NULL;
  75         scpnt->scsi_done = done;
  76
  77         /*
  78          * figure out adapter and target device
  79          * (stored there by zfcp_scsi_slave_alloc)
  80          */
  81         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  82         unit = scpnt->device->hostdata;
  83
  84         BUG_ON(!adapter || (adapter != unit->port->adapter));
  85         BUG_ON(!scpnt->scsi_done);
  86
  87         if (unlikely(!unit)) {
  88                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  89                 return 0;
  90         }
  91
  92         scsi_result = fc_remote_port_chkready(rport);
  93         if (unlikely(scsi_result)) {
  94                 scpnt->result = scsi_result;
  95                 zfcp_scsi_dbf_event_result("fail", 4, adapter, scpnt, NULL);
  96                 scpnt->scsi_done(scpnt);
  97                 return 0;
  98         }
  99
 100         status = atomic_read(&unit->status);
 101         if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
 102                      !(status & ZFCP_STATUS_COMMON_RUNNING))) {
 103                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 104                 return 0;;
 105         }
 106
 107         ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
 108         if (unlikely(ret == -EBUSY))
 109                 return SCSI_MLQUEUE_DEVICE_BUSY;
 110         else if (unlikely(ret < 0))
 111                 return SCSI_MLQUEUE_HOST_BUSY;
 112
 113         return ret;
 114 }
 115
 116 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 117                                           int channel, unsigned int id,
 118                                           unsigned int lun)
 119 {
 120         struct zfcp_port *port;
 121         struct zfcp_unit *unit;
 122         int scsi_lun;
 123
 124         list_for_each_entry(port, &adapter->port_list_head, list) {
 125                 if (!port->rport || (id != port->rport->scsi_target_id))
 126                         continue;
 127                 list_for_each_entry(unit, &port->unit_list_head, list) {
 128                         scsi_lun = scsilun_to_int(
 129                                 (struct scsi_lun *)&unit->fcp_lun);
 130                         if (lun == scsi_lun)
 131                                 return unit;
 132                 }
 133         }
 134
 135         return NULL;
 136 }
 137
 138 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 139 {
 140         struct zfcp_adapter *adapter;
 141         struct zfcp_unit *unit;
 142         unsigned long flags;
 143         int retval = -ENXIO;
 144
 145         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 146         if (!adapter)
 147                 goto out;
 148
 149         read_lock_irqsave(&zfcp_data.config_lock, flags);
 150         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 151         if (unit) {
 152                 sdp->hostdata = unit;
 153                 unit->device = sdp;
 154                 zfcp_unit_get(unit);
 155                 retval = 0;
 156         }
 157         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 158 out:
 159         return retval;
 160 }
 161
 162 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 163 {
 164         struct Scsi_Host *scsi_host = scpnt->device->host;
 165         struct zfcp_adapter *adapter =
 166                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 167         struct zfcp_unit *unit = scpnt->device->hostdata;
 168         struct zfcp_fsf_req *old_req, *abrt_req;
 169         unsigned long flags;
 170         unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
 171         int retval = SUCCESS;
 172         int retry = 3;
 173
 174         /* avoid race condition between late normal completion and abort */
 175         write_lock_irqsave(&adapter->abort_lock, flags);
 176
 177         spin_lock(&adapter->req_list_lock);
 178         old_req = zfcp_reqlist_find(adapter, old_req_id);
 179         spin_unlock(&adapter->req_list_lock);
 180         if (!old_req) {
 181                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 182                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL,
 183                                           old_req_id);
 184                 return FAILED; /* completion could be in progress */
 185         }
 186         old_req->data = NULL;
 187
 188         /* don't access old fsf_req after releasing the abort_lock */
 189         write_unlock_irqrestore(&adapter->abort_lock, flags);
 190
 191         while (retry--) {
 192                 abrt_req = zfcp_fsf_abort_fcp_command(old_req_id, unit);
 193                 if (abrt_req)
 194                         break;
 195
 196                 zfcp_erp_wait(adapter);
 197                 if (!(atomic_read(&adapter->status) &
 198                       ZFCP_STATUS_COMMON_RUNNING)) {
 199                         zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 200                                                   old_req_id);
 201                         return SUCCESS;
 202                 }
 203         }
 204         if (!abrt_req)
 205                 return FAILED;
 206
 207         wait_event(abrt_req->completion_wq,
 208                    abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 209
 210         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 211                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, abrt_req, 0);
 212         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 213                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, abrt_req, 0);
 214         else {
 215                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, abrt_req, 0);
 216                 retval = FAILED;
 217         }
 218         zfcp_fsf_req_free(abrt_req);
 219         return retval;
 220 }
 221
 222 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 223 {
 224         struct zfcp_unit *unit = scpnt->device->hostdata;
 225         struct zfcp_adapter *adapter = unit->port->adapter;
 226         struct zfcp_fsf_req *fsf_req;
 227         int retval = SUCCESS;
 228         int retry = 3;
 229
 230         while (retry--) {
 231                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 232                 if (fsf_req)
 233                         break;
 234
 235                 zfcp_erp_wait(adapter);
 236                 if (!(atomic_read(&adapter->status) &
 237                       ZFCP_STATUS_COMMON_RUNNING)) {
 238                         zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit,
 239                                                      scpnt);
 240                         return SUCCESS;
 241                 }
 242         }
 243         if (!fsf_req)
 244                 return FAILED;
 245
 246         wait_event(fsf_req->completion_wq,
 247                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 248
 249         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 250                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 251                 retval = FAILED;
 252         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 253                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 254                 retval = FAILED;
 255         } else
 256                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 257
 258         zfcp_fsf_req_free(fsf_req);
 259         return retval;
 260 }
 261
 262 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 263 {
 264         return zfcp_task_mgmt_function(scpnt, FCP_LOGICAL_UNIT_RESET);
 265 }
 266
 267 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 268 {
 269         return zfcp_task_mgmt_function(scpnt, FCP_TARGET_RESET);
 270 }
 271
 272 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 273 {
 274         struct zfcp_unit *unit = scpnt->device->hostdata;
 275         struct zfcp_adapter *adapter = unit->port->adapter;
 276
 277         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 278         zfcp_erp_wait(adapter);
 279
 280         return SUCCESS;
 281 }
 282
 283 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 284 {
 285         struct ccw_dev_id dev_id;
 286
 287         if (adapter->scsi_host)
 288                 return 0;
 289
 290         ccw_device_get_id(adapter->ccw_device, &dev_id);
 291         /* register adapter as SCSI host with mid layer of SCSI stack */
 292         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 293                                              sizeof (struct zfcp_adapter *));
 294         if (!adapter->scsi_host) {
 295                 dev_err(&adapter->ccw_device->dev,
 296                         "Registering the FCP device with the "
 297                         "SCSI stack failed\n");
 298                 return -EIO;
 299         }
 300
 301         /* tell the SCSI stack some characteristics of this adapter */
 302         adapter->scsi_host->max_id = 1;
 303         adapter->scsi_host->max_lun = 1;
 304         adapter->scsi_host->max_channel = 0;
 305         adapter->scsi_host->unique_id = dev_id.devno;
 306         adapter->scsi_host->max_cmd_len = 255;
 307         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 308
 309         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 310
 311         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 312                 scsi_host_put(adapter->scsi_host);
 313                 return -EIO;
 314         }
 315
 316         return 0;
 317 }
 318
 319 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 320 {
 321         struct Scsi_Host *shost;
 322         struct zfcp_port *port;
 323
 324         shost = adapter->scsi_host;
 325         if (!shost)
 326                 return;
 327
 328         read_lock_irq(&zfcp_data.config_lock);
 329         list_for_each_entry(port, &adapter->port_list_head, list)
 330                 if (port->rport)
 331                         port->rport = NULL;
 332
 333         read_unlock_irq(&zfcp_data.config_lock);
 334         fc_remove_host(shost);
 335         scsi_remove_host(shost);
 336         scsi_host_put(shost);
 337         adapter->scsi_host = NULL;
 338
 339         return;
 340 }
 341
 342 static struct fc_host_statistics*
 343 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 344 {
 345         struct fc_host_statistics *fc_stats;
 346
 347         if (!adapter->fc_stats) {
 348                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 349                 if (!fc_stats)
 350                         return NULL;
 351                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 352         }
 353         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 354         return adapter->fc_stats;
 355 }
 356
 357 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 358                                       struct fsf_qtcb_bottom_port *data,
 359                                       struct fsf_qtcb_bottom_port *old)
 360 {
 361         fc_stats->seconds_since_last_reset =
 362                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 363         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 364         fc_stats->tx_words = data->tx_words - old->tx_words;
 365         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 366         fc_stats->rx_words = data->rx_words - old->rx_words;
 367         fc_stats->lip_count = data->lip - old->lip;
 368         fc_stats->nos_count = data->nos - old->nos;
 369         fc_stats->error_frames = data->error_frames - old->error_frames;
 370         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 371         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 372         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 373         fc_stats->loss_of_signal_count =
 374                 data->loss_of_signal - old->loss_of_signal;
 375         fc_stats->prim_seq_protocol_err_count =
 376                 data->psp_error_counts - old->psp_error_counts;
 377         fc_stats->invalid_tx_word_count =
 378                 data->invalid_tx_words - old->invalid_tx_words;
 379         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 380         fc_stats->fcp_input_requests =
 381                 data->input_requests - old->input_requests;
 382         fc_stats->fcp_output_requests =
 383                 data->output_requests - old->output_requests;
 384         fc_stats->fcp_control_requests =
 385                 data->control_requests - old->control_requests;
 386         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 387         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 388 }
 389
 390 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 391                                    struct fsf_qtcb_bottom_port *data)
 392 {
 393         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 394         fc_stats->tx_frames = data->tx_frames;
 395         fc_stats->tx_words = data->tx_words;
 396         fc_stats->rx_frames = data->rx_frames;
 397         fc_stats->rx_words = data->rx_words;
 398         fc_stats->lip_count = data->lip;
 399         fc_stats->nos_count = data->nos;
 400         fc_stats->error_frames = data->error_frames;
 401         fc_stats->dumped_frames = data->dumped_frames;
 402         fc_stats->link_failure_count = data->link_failure;
 403         fc_stats->loss_of_sync_count = data->loss_of_sync;
 404         fc_stats->loss_of_signal_count = data->loss_of_signal;
 405         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 406         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 407         fc_stats->invalid_crc_count = data->invalid_crcs;
 408         fc_stats->fcp_input_requests = data->input_requests;
 409         fc_stats->fcp_output_requests = data->output_requests;
 410         fc_stats->fcp_control_requests = data->control_requests;
 411         fc_stats->fcp_input_megabytes = data->input_mb;
 412         fc_stats->fcp_output_megabytes = data->output_mb;
 413 }
 414
 415 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 416 {
 417         struct zfcp_adapter *adapter;
 418         struct fc_host_statistics *fc_stats;
 419         struct fsf_qtcb_bottom_port *data;
 420         int ret;
 421
 422         adapter = (struct zfcp_adapter *)host->hostdata[0];
 423         fc_stats = zfcp_init_fc_host_stats(adapter);
 424         if (!fc_stats)
 425                 return NULL;
 426
 427         data = kzalloc(sizeof(*data), GFP_KERNEL);
 428         if (!data)
 429                 return NULL;
 430
 431         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 432         if (ret) {
 433                 kfree(data);
 434                 return NULL;
 435         }
 436
 437         if (adapter->stats_reset &&
 438             ((jiffies/HZ - adapter->stats_reset) <
 439              data->seconds_since_last_reset))
 440                 zfcp_adjust_fc_host_stats(fc_stats, data,
 441                                           adapter->stats_reset_data);
 442         else
 443                 zfcp_set_fc_host_stats(fc_stats, data);
 444
 445         kfree(data);
 446         return fc_stats;
 447 }
 448
 449 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 450 {
 451         struct zfcp_adapter *adapter;
 452         struct fsf_qtcb_bottom_port *data;
 453         int ret;
 454
 455         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 456         data = kzalloc(sizeof(*data), GFP_KERNEL);
 457         if (!data)
 458                 return;
 459
 460         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 461         if (ret)
 462                 kfree(data);
 463         else {
 464                 adapter->stats_reset = jiffies/HZ;
 465                 kfree(adapter->stats_reset_data);
 466                 adapter->stats_reset_data = data; /* finally freed in
 467                                                      adapter_dequeue */
 468         }
 469 }
 470
 471 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 472 {
 473         struct zfcp_adapter *adapter =
 474                 (struct zfcp_adapter *)shost->hostdata[0];
 475         int status = atomic_read(&adapter->status);
 476
 477         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 478             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 479                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 480         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 481                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 482         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 483                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 484         else
 485                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 486 }
 487
 488 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 489 {
 490         rport->dev_loss_tmo = timeout;
 491 }
 492
 493 /**
 494  * zfcp_scsi_dev_loss_tmo_callbk - Free any reference to rport
 495  * @rport: The rport that is about to be deleted.
 496  */
 497 static void zfcp_scsi_dev_loss_tmo_callbk(struct fc_rport *rport)
 498 {
 499         struct zfcp_port *port;
 500
 501         write_lock_irq(&zfcp_data.config_lock);
 502         port = rport->dd_data;
 503         if (port)
 504                 port->rport = NULL;
 505         write_unlock_irq(&zfcp_data.config_lock);
 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 for avoids 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
 520         write_lock_irq(&zfcp_data.config_lock);
 521         port = rport->dd_data;
 522         if (port)
 523                 zfcp_port_get(port);
 524         write_unlock_irq(&zfcp_data.config_lock);
 525
 526         if (port) {
 527                 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
 528                 zfcp_port_put(port);
 529         }
 530 }
 531
 532 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 533 {
 534         struct fc_rport_identifiers ids;
 535         struct fc_rport *rport;
 536
 537         if (port->rport)
 538                 return;
 539
 540         ids.node_name = port->wwnn;
 541         ids.port_name = port->wwpn;
 542         ids.port_id = port->d_id;
 543         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 544
 545         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 546         if (!rport) {
 547                 dev_err(&port->adapter->ccw_device->dev,
 548                         "Registering port 0x%016Lx failed\n",
 549                         (unsigned long long)port->wwpn);
 550                 return;
 551         }
 552
 553         rport->dd_data = port;
 554         rport->maxframe_size = port->maxframe_size;
 555         rport->supported_classes = port->supported_classes;
 556         port->rport = rport;
 557 }
 558
 559 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 560 {
 561         struct fc_rport *rport = port->rport;
 562
 563         if (rport) {
 564                 fc_remote_port_delete(rport);
 565                 port->rport = NULL;
 566         }
 567 }
 568
 569 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 570 {
 571         zfcp_port_get(port);
 572         port->rport_task = RPORT_ADD;
 573
 574         if (!queue_work(zfcp_data.work_queue, &port->rport_work))
 575                 zfcp_port_put(port);
 576 }
 577
 578 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 579 {
 580         zfcp_port_get(port);
 581         port->rport_task = RPORT_DEL;
 582
 583         if (!queue_work(zfcp_data.work_queue, &port->rport_work))
 584                 zfcp_port_put(port);
 585 }
 586
 587 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 588 {
 589         struct zfcp_port *port;
 590
 591         list_for_each_entry(port, &adapter->port_list_head, list)
 592                 zfcp_scsi_schedule_rport_block(port);
 593 }
 594
 595 void zfcp_scsi_rport_work(struct work_struct *work)
 596 {
 597         struct zfcp_port *port = container_of(work, struct zfcp_port,
 598                                               rport_work);
 599
 600         while (port->rport_task) {
 601                 if (port->rport_task == RPORT_ADD) {
 602                         port->rport_task = RPORT_NONE;
 603                         zfcp_scsi_rport_register(port);
 604                 } else {
 605                         port->rport_task = RPORT_NONE;
 606                         zfcp_scsi_rport_block(port);
 607                 }
 608         }
 609
 610         zfcp_port_put(port);
 611 }
 612
 613
 614 void zfcp_scsi_scan(struct work_struct *work)
 615 {
 616         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 617                                               scsi_work);
 618         struct fc_rport *rport;
 619
 620         flush_work(&unit->port->rport_work);
 621         rport = unit->port->rport;
 622
 623         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 624                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 625                                  scsilun_to_int((struct scsi_lun *)
 626                                                 &unit->fcp_lun), 0);
 627
 628         zfcp_unit_put(unit);
 629 }
 630
 631 static int zfcp_execute_fc_job(struct fc_bsg_job *job)
 632 {
 633         switch (job->request->msgcode) {
 634         case FC_BSG_RPT_ELS:
 635         case FC_BSG_HST_ELS_NOLOGIN:
 636                 return zfcp_fc_execute_els_fc_job(job);
 637         case FC_BSG_RPT_CT:
 638         case FC_BSG_HST_CT:
 639                 return zfcp_fc_execute_ct_fc_job(job);
 640         default:
 641                 return -EINVAL;
 642         }
 643 }
 644
 645 struct fc_function_template zfcp_transport_functions = {
 646         .show_starget_port_id = 1,
 647         .show_starget_port_name = 1,
 648         .show_starget_node_name = 1,
 649         .show_rport_supported_classes = 1,
 650         .show_rport_maxframe_size = 1,
 651         .show_rport_dev_loss_tmo = 1,
 652         .show_host_node_name = 1,
 653         .show_host_port_name = 1,
 654         .show_host_permanent_port_name = 1,
 655         .show_host_supported_classes = 1,
 656         .show_host_supported_speeds = 1,
 657         .show_host_maxframe_size = 1,
 658         .show_host_serial_number = 1,
 659         .get_fc_host_stats = zfcp_get_fc_host_stats,
 660         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 661         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 662         .get_host_port_state = zfcp_get_host_port_state,
 663         .dev_loss_tmo_callbk = zfcp_scsi_dev_loss_tmo_callbk,
 664         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 665         .show_host_port_state = 1,
 666         .bsg_request = zfcp_execute_fc_job,
 667         /* no functions registered for following dynamic attributes but
 668            directly set by LLDD */
 669         .show_host_port_type = 1,
 670         .show_host_speed = 1,
 671         .show_host_port_id = 1,
 672         .disable_target_scan = 1,
 673 };
 674
 675 struct zfcp_data zfcp_data = {
 676         .scsi_host_template = {
 677                 .name                    = "zfcp",
 678                 .module                  = THIS_MODULE,
 679                 .proc_name               = "zfcp",
 680                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 681                 .slave_alloc             = zfcp_scsi_slave_alloc,
 682                 .slave_configure         = zfcp_scsi_slave_configure,
 683                 .slave_destroy           = zfcp_scsi_slave_destroy,
 684                 .queuecommand            = zfcp_scsi_queuecommand,
 685                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 686                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 687                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 688                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 689                 .can_queue               = 4096,
 690                 .this_id                 = -1,
 691                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 692                 .cmd_per_lun             = 1,
 693                 .use_clustering          = 1,
 694                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 695                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 696                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 697         },
 698 };