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         struct zfcp_adapter *adapter =
  57                 (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  58         set_host_byte(scpnt, result);
  59         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
  60                 zfcp_dbf_scsi_result("fail", 4, adapter->dbf, 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_dbf_scsi_result("fail", 4, adapter->dbf, 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_dbf_scsi_abort("lte1", adapter->dbf, 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_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
 202                                             old_reqid);
 203                         return SUCCESS;
 204                 }
 205         }
 206         if (!abrt_req)
 207                 return FAILED;
 208
 209         wait_for_completion(&abrt_req->completion);
 210
 211         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 212                 dbf_tag = "okay";
 213         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 214                 dbf_tag = "lte2";
 215         else {
 216                 dbf_tag = "fail";
 217                 retval = FAILED;
 218         }
 219         zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
 220         zfcp_fsf_req_free(abrt_req);
 221         return retval;
 222 }
 223
 224 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 225 {
 226         struct zfcp_unit *unit = scpnt->device->hostdata;
 227         struct zfcp_adapter *adapter = unit->port->adapter;
 228         struct zfcp_fsf_req *fsf_req = NULL;
 229         int retval = SUCCESS;
 230         int retry = 3;
 231
 232         while (retry--) {
 233                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 234                 if (fsf_req)
 235                         break;
 236
 237                 zfcp_erp_wait(adapter);
 238                 if (!(atomic_read(&adapter->status) &
 239                       ZFCP_STATUS_COMMON_RUNNING)) {
 240                         zfcp_dbf_scsi_devreset("nres", tm_flags, unit, scpnt);
 241                         return SUCCESS;
 242                 }
 243         }
 244         if (!fsf_req)
 245                 return FAILED;
 246
 247         wait_for_completion(&fsf_req->completion);
 248
 249         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 250                 zfcp_dbf_scsi_devreset("fail", tm_flags, unit, scpnt);
 251                 retval = FAILED;
 252         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 253                 zfcp_dbf_scsi_devreset("nsup", tm_flags, unit, scpnt);
 254                 retval = FAILED;
 255         } else
 256                 zfcp_dbf_scsi_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->qdio, 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->qdio, 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_terminate_rport_io - Terminate all I/O on a rport
 495  * @rport: The FC rport where to teminate I/O
 496  *
 497  * Abort all pending SCSI commands for a port by closing the
 498  * port. Using a reopen for avoids a conflict with a shutdown
 499  * overwriting a reopen.
 500  */
 501 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 502 {
 503         struct zfcp_port *port;
 504         struct Scsi_Host *shost = rport_to_shost(rport);
 505         struct zfcp_adapter *adapter =
 506                 (struct zfcp_adapter *)shost->hostdata[0];
 507
 508         write_lock_irq(&zfcp_data.config_lock);
 509         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 510         if (port)
 511                 zfcp_port_get(port);
 512         write_unlock_irq(&zfcp_data.config_lock);
 513
 514         if (port) {
 515                 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
 516                 zfcp_port_put(port);
 517         }
 518 }
 519
 520 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 521 {
 522         struct fc_rport_identifiers ids;
 523         struct fc_rport *rport;
 524
 525         if (port->rport)
 526                 return;
 527
 528         ids.node_name = port->wwnn;
 529         ids.port_name = port->wwpn;
 530         ids.port_id = port->d_id;
 531         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 532
 533         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 534         if (!rport) {
 535                 dev_err(&port->adapter->ccw_device->dev,
 536                         "Registering port 0x%016Lx failed\n",
 537                         (unsigned long long)port->wwpn);
 538                 return;
 539         }
 540
 541         rport->maxframe_size = port->maxframe_size;
 542         rport->supported_classes = port->supported_classes;
 543         port->rport = rport;
 544 }
 545
 546 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 547 {
 548         struct fc_rport *rport = port->rport;
 549
 550         if (rport) {
 551                 fc_remote_port_delete(rport);
 552                 port->rport = NULL;
 553         }
 554 }
 555
 556 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 557 {
 558         zfcp_port_get(port);
 559         port->rport_task = RPORT_ADD;
 560
 561         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 562                 zfcp_port_put(port);
 563 }
 564
 565 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 566 {
 567         zfcp_port_get(port);
 568         port->rport_task = RPORT_DEL;
 569
 570         if (port->rport && queue_work(port->adapter->work_queue,
 571                                       &port->rport_work))
 572                 return;
 573
 574         zfcp_port_put(port);
 575 }
 576
 577 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 578 {
 579         struct zfcp_port *port;
 580
 581         list_for_each_entry(port, &adapter->port_list_head, list)
 582                 zfcp_scsi_schedule_rport_block(port);
 583 }
 584
 585 void zfcp_scsi_rport_work(struct work_struct *work)
 586 {
 587         struct zfcp_port *port = container_of(work, struct zfcp_port,
 588                                               rport_work);
 589
 590         while (port->rport_task) {
 591                 if (port->rport_task == RPORT_ADD) {
 592                         port->rport_task = RPORT_NONE;
 593                         zfcp_scsi_rport_register(port);
 594                 } else {
 595                         port->rport_task = RPORT_NONE;
 596                         zfcp_scsi_rport_block(port);
 597                 }
 598         }
 599
 600         zfcp_port_put(port);
 601 }
 602
 603
 604 void zfcp_scsi_scan(struct work_struct *work)
 605 {
 606         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 607                                               scsi_work);
 608         struct fc_rport *rport;
 609
 610         flush_work(&unit->port->rport_work);
 611         rport = unit->port->rport;
 612
 613         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 614                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 615                                  scsilun_to_int((struct scsi_lun *)
 616                                                 &unit->fcp_lun), 0);
 617
 618         zfcp_unit_put(unit);
 619 }
 620
 621 static int zfcp_execute_fc_job(struct fc_bsg_job *job)
 622 {
 623         switch (job->request->msgcode) {
 624         case FC_BSG_RPT_ELS:
 625         case FC_BSG_HST_ELS_NOLOGIN:
 626                 return zfcp_fc_execute_els_fc_job(job);
 627         case FC_BSG_RPT_CT:
 628         case FC_BSG_HST_CT:
 629                 return zfcp_fc_execute_ct_fc_job(job);
 630         default:
 631                 return -EINVAL;
 632         }
 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_execute_fc_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 };
 663
 664 struct zfcp_data zfcp_data = {
 665         .scsi_host_template = {
 666                 .name                    = "zfcp",
 667                 .module                  = THIS_MODULE,
 668                 .proc_name               = "zfcp",
 669                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 670                 .slave_alloc             = zfcp_scsi_slave_alloc,
 671                 .slave_configure         = zfcp_scsi_slave_configure,
 672                 .slave_destroy           = zfcp_scsi_slave_destroy,
 673                 .queuecommand            = zfcp_scsi_queuecommand,
 674                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 675                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 676                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 677                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 678                 .can_queue               = 4096,
 679                 .this_id                 = -1,
 680                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 681                 .cmd_per_lun             = 1,
 682                 .use_clustering          = 1,
 683                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 684                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 685                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 686         },
 687 };