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 <linux/slab.h>
  14 #include <scsi/fc/fc_fcp.h>
  15 #include <scsi/scsi_eh.h>
  16 #include <asm/atomic.h>
  17 #include "zfcp_ext.h"
  18 #include "zfcp_dbf.h"
  19 #include "zfcp_fc.h"
  20 #include "zfcp_reqlist.h"
  21
  22 static unsigned int default_depth = 32;
  23 module_param_named(queue_depth, default_depth, uint, 0600);
  24 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  25
  26 static bool enable_dif;
  27
  28 #ifdef CONFIG_ZFCP_DIF
  29 module_param_named(dif, enable_dif, bool, 0600);
  30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  31 #endif
  32
  33 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  34                                         int reason)
  35 {
  36         switch (reason) {
  37         case SCSI_QDEPTH_DEFAULT:
  38                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  39                 break;
  40         case SCSI_QDEPTH_QFULL:
  41                 scsi_track_queue_full(sdev, depth);
  42                 break;
  43         case SCSI_QDEPTH_RAMP_UP:
  44                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  45                 break;
  46         default:
  47                 return -EOPNOTSUPP;
  48         }
  49         return sdev->queue_depth;
  50 }
  51
  52 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  53 {
  54         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  55         unit->device = NULL;
  56         put_device(&unit->dev);
  57 }
  58
  59 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  60 {
  61         if (sdp->tagged_supported)
  62                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  63         else
  64                 scsi_adjust_queue_depth(sdp, 0, 1);
  65         return 0;
  66 }
  67
  68 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  69 {
  70         struct zfcp_adapter *adapter =
  71                 (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  72
  73         set_host_byte(scpnt, result);
  74         zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
  75         scpnt->scsi_done(scpnt);
  76 }
  77
  78 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  79                                   void (*done) (struct scsi_cmnd *))
  80 {
  81         struct zfcp_unit *unit;
  82         struct zfcp_adapter *adapter;
  83         int    status, scsi_result, ret;
  84         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  85
  86         /* reset the status for this request */
  87         scpnt->result = 0;
  88         scpnt->host_scribble = NULL;
  89         scpnt->scsi_done = done;
  90
  91         /*
  92          * figure out adapter and target device
  93          * (stored there by zfcp_scsi_slave_alloc)
  94          */
  95         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  96         unit = scpnt->device->hostdata;
  97
  98         scsi_result = fc_remote_port_chkready(rport);
  99         if (unlikely(scsi_result)) {
 100                 scpnt->result = scsi_result;
 101                 zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
 102                 scpnt->scsi_done(scpnt);
 103                 return 0;
 104         }
 105
 106         status = atomic_read(&unit->status);
 107         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 108                      !(atomic_read(&unit->port->status) &
 109                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 110                 /* only unit access denied, but port is good
 111                  * not covered by FC transport, have to fail here */
 112                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 113                 return 0;
 114         }
 115
 116         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 117                 /* This could be either
 118                  * open unit pending: this is temporary, will result in
 119                  *      open unit or ERP_FAILED, so retry command
 120                  * call to rport_delete pending: mimic retry from
 121                  *      fc_remote_port_chkready until rport is BLOCKED
 122                  */
 123                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 124                 return 0;
 125         }
 126
 127         ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
 128         if (unlikely(ret == -EBUSY))
 129                 return SCSI_MLQUEUE_DEVICE_BUSY;
 130         else if (unlikely(ret < 0))
 131                 return SCSI_MLQUEUE_HOST_BUSY;
 132
 133         return ret;
 134 }
 135
 136 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 137                                           unsigned int id, u64 lun)
 138 {
 139         unsigned long flags;
 140         struct zfcp_port *port;
 141         struct zfcp_unit *unit = NULL;
 142
 143         read_lock_irqsave(&adapter->port_list_lock, flags);
 144         list_for_each_entry(port, &adapter->port_list, list) {
 145                 if (!port->rport || (id != port->rport->scsi_target_id))
 146                         continue;
 147                 unit = zfcp_get_unit_by_lun(port, lun);
 148                 if (unit)
 149                         break;
 150         }
 151         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 152
 153         return unit;
 154 }
 155
 156 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 157 {
 158         struct zfcp_adapter *adapter;
 159         struct zfcp_unit *unit;
 160         u64 lun;
 161
 162         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 163         if (!adapter)
 164                 goto out;
 165
 166         int_to_scsilun(sdp->lun, (struct scsi_lun *)&lun);
 167         unit = zfcp_unit_lookup(adapter, sdp->id, lun);
 168         if (unit) {
 169                 sdp->hostdata = unit;
 170                 unit->device = sdp;
 171                 return 0;
 172         }
 173 out:
 174         return -ENXIO;
 175 }
 176
 177 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 178 {
 179         struct Scsi_Host *scsi_host = scpnt->device->host;
 180         struct zfcp_adapter *adapter =
 181                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 182         struct zfcp_unit *unit = scpnt->device->hostdata;
 183         struct zfcp_fsf_req *old_req, *abrt_req;
 184         unsigned long flags;
 185         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 186         int retval = SUCCESS, ret;
 187         int retry = 3;
 188         char *dbf_tag;
 189
 190         /* avoid race condition between late normal completion and abort */
 191         write_lock_irqsave(&adapter->abort_lock, flags);
 192
 193         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 194         if (!old_req) {
 195                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 196                 zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
 197                                     old_reqid);
 198                 return FAILED; /* completion could be in progress */
 199         }
 200         old_req->data = NULL;
 201
 202         /* don't access old fsf_req after releasing the abort_lock */
 203         write_unlock_irqrestore(&adapter->abort_lock, flags);
 204
 205         while (retry--) {
 206                 abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
 207                 if (abrt_req)
 208                         break;
 209
 210                 zfcp_erp_wait(adapter);
 211                 ret = fc_block_scsi_eh(scpnt);
 212                 if (ret)
 213                         return ret;
 214                 if (!(atomic_read(&adapter->status) &
 215                       ZFCP_STATUS_COMMON_RUNNING)) {
 216                         zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
 217                                             old_reqid);
 218                         return SUCCESS;
 219                 }
 220         }
 221         if (!abrt_req)
 222                 return FAILED;
 223
 224         wait_for_completion(&abrt_req->completion);
 225
 226         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 227                 dbf_tag = "okay";
 228         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 229                 dbf_tag = "lte2";
 230         else {
 231                 dbf_tag = "fail";
 232                 retval = FAILED;
 233         }
 234         zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
 235         zfcp_fsf_req_free(abrt_req);
 236         return retval;
 237 }
 238
 239 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 240 {
 241         struct zfcp_unit *unit = scpnt->device->hostdata;
 242         struct zfcp_adapter *adapter = unit->port->adapter;
 243         struct zfcp_fsf_req *fsf_req = NULL;
 244         int retval = SUCCESS, ret;
 245         int retry = 3;
 246
 247         while (retry--) {
 248                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 249                 if (fsf_req)
 250                         break;
 251
 252                 zfcp_erp_wait(adapter);
 253                 ret = fc_block_scsi_eh(scpnt);
 254                 if (ret)
 255                         return ret;
 256
 257                 if (!(atomic_read(&adapter->status) &
 258                       ZFCP_STATUS_COMMON_RUNNING)) {
 259                         zfcp_dbf_scsi_devreset("nres", tm_flags, unit, scpnt);
 260                         return SUCCESS;
 261                 }
 262         }
 263         if (!fsf_req)
 264                 return FAILED;
 265
 266         wait_for_completion(&fsf_req->completion);
 267
 268         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 269                 zfcp_dbf_scsi_devreset("fail", tm_flags, unit, scpnt);
 270                 retval = FAILED;
 271         } else
 272                 zfcp_dbf_scsi_devreset("okay", tm_flags, unit, scpnt);
 273
 274         zfcp_fsf_req_free(fsf_req);
 275         return retval;
 276 }
 277
 278 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 279 {
 280         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 281 }
 282
 283 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 284 {
 285         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 286 }
 287
 288 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 289 {
 290         struct zfcp_unit *unit = scpnt->device->hostdata;
 291         struct zfcp_adapter *adapter = unit->port->adapter;
 292         int ret;
 293
 294         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 295         zfcp_erp_wait(adapter);
 296         ret = fc_block_scsi_eh(scpnt);
 297         if (ret)
 298                 return ret;
 299
 300         return SUCCESS;
 301 }
 302
 303 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 304 {
 305         struct ccw_dev_id dev_id;
 306
 307         if (adapter->scsi_host)
 308                 return 0;
 309
 310         ccw_device_get_id(adapter->ccw_device, &dev_id);
 311         /* register adapter as SCSI host with mid layer of SCSI stack */
 312         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 313                                              sizeof (struct zfcp_adapter *));
 314         if (!adapter->scsi_host) {
 315                 dev_err(&adapter->ccw_device->dev,
 316                         "Registering the FCP device with the "
 317                         "SCSI stack failed\n");
 318                 return -EIO;
 319         }
 320
 321         /* tell the SCSI stack some characteristics of this adapter */
 322         adapter->scsi_host->max_id = 1;
 323         adapter->scsi_host->max_lun = 1;
 324         adapter->scsi_host->max_channel = 0;
 325         adapter->scsi_host->unique_id = dev_id.devno;
 326         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 327         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 328
 329         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 330
 331         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 332                 scsi_host_put(adapter->scsi_host);
 333                 return -EIO;
 334         }
 335
 336         return 0;
 337 }
 338
 339 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 340 {
 341         struct Scsi_Host *shost;
 342         struct zfcp_port *port;
 343
 344         shost = adapter->scsi_host;
 345         if (!shost)
 346                 return;
 347
 348         read_lock_irq(&adapter->port_list_lock);
 349         list_for_each_entry(port, &adapter->port_list, list)
 350                 port->rport = NULL;
 351         read_unlock_irq(&adapter->port_list_lock);
 352
 353         fc_remove_host(shost);
 354         scsi_remove_host(shost);
 355         scsi_host_put(shost);
 356         adapter->scsi_host = NULL;
 357
 358         return;
 359 }
 360
 361 static struct fc_host_statistics*
 362 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 363 {
 364         struct fc_host_statistics *fc_stats;
 365
 366         if (!adapter->fc_stats) {
 367                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 368                 if (!fc_stats)
 369                         return NULL;
 370                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 371         }
 372         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 373         return adapter->fc_stats;
 374 }
 375
 376 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 377                                       struct fsf_qtcb_bottom_port *data,
 378                                       struct fsf_qtcb_bottom_port *old)
 379 {
 380         fc_stats->seconds_since_last_reset =
 381                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 382         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 383         fc_stats->tx_words = data->tx_words - old->tx_words;
 384         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 385         fc_stats->rx_words = data->rx_words - old->rx_words;
 386         fc_stats->lip_count = data->lip - old->lip;
 387         fc_stats->nos_count = data->nos - old->nos;
 388         fc_stats->error_frames = data->error_frames - old->error_frames;
 389         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 390         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 391         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 392         fc_stats->loss_of_signal_count =
 393                 data->loss_of_signal - old->loss_of_signal;
 394         fc_stats->prim_seq_protocol_err_count =
 395                 data->psp_error_counts - old->psp_error_counts;
 396         fc_stats->invalid_tx_word_count =
 397                 data->invalid_tx_words - old->invalid_tx_words;
 398         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 399         fc_stats->fcp_input_requests =
 400                 data->input_requests - old->input_requests;
 401         fc_stats->fcp_output_requests =
 402                 data->output_requests - old->output_requests;
 403         fc_stats->fcp_control_requests =
 404                 data->control_requests - old->control_requests;
 405         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 406         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 407 }
 408
 409 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 410                                    struct fsf_qtcb_bottom_port *data)
 411 {
 412         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 413         fc_stats->tx_frames = data->tx_frames;
 414         fc_stats->tx_words = data->tx_words;
 415         fc_stats->rx_frames = data->rx_frames;
 416         fc_stats->rx_words = data->rx_words;
 417         fc_stats->lip_count = data->lip;
 418         fc_stats->nos_count = data->nos;
 419         fc_stats->error_frames = data->error_frames;
 420         fc_stats->dumped_frames = data->dumped_frames;
 421         fc_stats->link_failure_count = data->link_failure;
 422         fc_stats->loss_of_sync_count = data->loss_of_sync;
 423         fc_stats->loss_of_signal_count = data->loss_of_signal;
 424         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 425         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 426         fc_stats->invalid_crc_count = data->invalid_crcs;
 427         fc_stats->fcp_input_requests = data->input_requests;
 428         fc_stats->fcp_output_requests = data->output_requests;
 429         fc_stats->fcp_control_requests = data->control_requests;
 430         fc_stats->fcp_input_megabytes = data->input_mb;
 431         fc_stats->fcp_output_megabytes = data->output_mb;
 432 }
 433
 434 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 435 {
 436         struct zfcp_adapter *adapter;
 437         struct fc_host_statistics *fc_stats;
 438         struct fsf_qtcb_bottom_port *data;
 439         int ret;
 440
 441         adapter = (struct zfcp_adapter *)host->hostdata[0];
 442         fc_stats = zfcp_init_fc_host_stats(adapter);
 443         if (!fc_stats)
 444                 return NULL;
 445
 446         data = kzalloc(sizeof(*data), GFP_KERNEL);
 447         if (!data)
 448                 return NULL;
 449
 450         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 451         if (ret) {
 452                 kfree(data);
 453                 return NULL;
 454         }
 455
 456         if (adapter->stats_reset &&
 457             ((jiffies/HZ - adapter->stats_reset) <
 458              data->seconds_since_last_reset))
 459                 zfcp_adjust_fc_host_stats(fc_stats, data,
 460                                           adapter->stats_reset_data);
 461         else
 462                 zfcp_set_fc_host_stats(fc_stats, data);
 463
 464         kfree(data);
 465         return fc_stats;
 466 }
 467
 468 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 469 {
 470         struct zfcp_adapter *adapter;
 471         struct fsf_qtcb_bottom_port *data;
 472         int ret;
 473
 474         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 475         data = kzalloc(sizeof(*data), GFP_KERNEL);
 476         if (!data)
 477                 return;
 478
 479         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 480         if (ret)
 481                 kfree(data);
 482         else {
 483                 adapter->stats_reset = jiffies/HZ;
 484                 kfree(adapter->stats_reset_data);
 485                 adapter->stats_reset_data = data; /* finally freed in
 486                                                      adapter_release */
 487         }
 488 }
 489
 490 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 491 {
 492         struct zfcp_adapter *adapter =
 493                 (struct zfcp_adapter *)shost->hostdata[0];
 494         int status = atomic_read(&adapter->status);
 495
 496         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 497             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 498                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 499         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 500                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 501         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 502                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 503         else
 504                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 505 }
 506
 507 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 508 {
 509         rport->dev_loss_tmo = timeout;
 510 }
 511
 512 /**
 513  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 514  * @rport: The FC rport where to teminate I/O
 515  *
 516  * Abort all pending SCSI commands for a port by closing the
 517  * port. Using a reopen avoids a conflict with a shutdown
 518  * overwriting a reopen. The "forced" ensures that a disappeared port
 519  * is not opened again as valid due to the cached plogi data in
 520  * non-NPIV mode.
 521  */
 522 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 523 {
 524         struct zfcp_port *port;
 525         struct Scsi_Host *shost = rport_to_shost(rport);
 526         struct zfcp_adapter *adapter =
 527                 (struct zfcp_adapter *)shost->hostdata[0];
 528
 529         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 530
 531         if (port) {
 532                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1", NULL);
 533                 put_device(&port->dev);
 534         }
 535 }
 536
 537 static void zfcp_scsi_queue_unit_register(struct zfcp_port *port)
 538 {
 539         struct zfcp_unit *unit;
 540
 541         read_lock_irq(&port->unit_list_lock);
 542         list_for_each_entry(unit, &port->unit_list, list) {
 543                 get_device(&unit->dev);
 544                 if (scsi_queue_work(port->adapter->scsi_host,
 545                                     &unit->scsi_work) <= 0)
 546                         put_device(&unit->dev);
 547         }
 548         read_unlock_irq(&port->unit_list_lock);
 549 }
 550
 551 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 552 {
 553         struct fc_rport_identifiers ids;
 554         struct fc_rport *rport;
 555
 556         if (port->rport)
 557                 return;
 558
 559         ids.node_name = port->wwnn;
 560         ids.port_name = port->wwpn;
 561         ids.port_id = port->d_id;
 562         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 563
 564         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 565         if (!rport) {
 566                 dev_err(&port->adapter->ccw_device->dev,
 567                         "Registering port 0x%016Lx failed\n",
 568                         (unsigned long long)port->wwpn);
 569                 return;
 570         }
 571
 572         rport->maxframe_size = port->maxframe_size;
 573         rport->supported_classes = port->supported_classes;
 574         port->rport = rport;
 575         port->starget_id = rport->scsi_target_id;
 576
 577         zfcp_scsi_queue_unit_register(port);
 578 }
 579
 580 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 581 {
 582         struct fc_rport *rport = port->rport;
 583
 584         if (rport) {
 585                 fc_remote_port_delete(rport);
 586                 port->rport = NULL;
 587         }
 588 }
 589
 590 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 591 {
 592         get_device(&port->dev);
 593         port->rport_task = RPORT_ADD;
 594
 595         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 596                 put_device(&port->dev);
 597 }
 598
 599 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 600 {
 601         get_device(&port->dev);
 602         port->rport_task = RPORT_DEL;
 603
 604         if (port->rport && queue_work(port->adapter->work_queue,
 605                                       &port->rport_work))
 606                 return;
 607
 608         put_device(&port->dev);
 609 }
 610
 611 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 612 {
 613         unsigned long flags;
 614         struct zfcp_port *port;
 615
 616         read_lock_irqsave(&adapter->port_list_lock, flags);
 617         list_for_each_entry(port, &adapter->port_list, list)
 618                 zfcp_scsi_schedule_rport_block(port);
 619         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 620 }
 621
 622 void zfcp_scsi_rport_work(struct work_struct *work)
 623 {
 624         struct zfcp_port *port = container_of(work, struct zfcp_port,
 625                                               rport_work);
 626
 627         while (port->rport_task) {
 628                 if (port->rport_task == RPORT_ADD) {
 629                         port->rport_task = RPORT_NONE;
 630                         zfcp_scsi_rport_register(port);
 631                 } else {
 632                         port->rport_task = RPORT_NONE;
 633                         zfcp_scsi_rport_block(port);
 634                 }
 635         }
 636
 637         put_device(&port->dev);
 638 }
 639
 640 /**
 641  * zfcp_scsi_scan - Register LUN with SCSI midlayer
 642  * @unit: The LUN/unit to register
 643  */
 644 void zfcp_scsi_scan(struct zfcp_unit *unit)
 645 {
 646         struct fc_rport *rport = unit->port->rport;
 647
 648         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 649                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
 650                                  scsilun_to_int((struct scsi_lun *)
 651                                                 &unit->fcp_lun), 0);
 652 }
 653
 654 void zfcp_scsi_scan_work(struct work_struct *work)
 655 {
 656         struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
 657                                               scsi_work);
 658
 659         zfcp_scsi_scan(unit);
 660         put_device(&unit->dev);
 661 }
 662
 663 /**
 664  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 665  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 666  */
 667 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 668 {
 669         unsigned int mask = 0;
 670         unsigned int data_div;
 671         struct Scsi_Host *shost = adapter->scsi_host;
 672
 673         data_div = atomic_read(&adapter->status) &
 674                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 675
 676         if (enable_dif &&
 677             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 678                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 679
 680         if (enable_dif && data_div &&
 681             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 682                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 683                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 684                 shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
 685                 shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2;
 686         }
 687
 688         scsi_host_set_prot(shost, mask);
 689 }
 690
 691 /**
 692  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 693  * @scmd: The SCSI command to report the error for
 694  * @ascq: The ASCQ to put in the sense buffer
 695  *
 696  * See the error handling in sd_done for the sense codes used here.
 697  * Set DID_SOFT_ERROR to retry the request, if possible.
 698  */
 699 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 700 {
 701         scsi_build_sense_buffer(1, scmd->sense_buffer,
 702                                 ILLEGAL_REQUEST, 0x10, ascq);
 703         set_driver_byte(scmd, DRIVER_SENSE);
 704         scmd->result |= SAM_STAT_CHECK_CONDITION;
 705         set_host_byte(scmd, DID_SOFT_ERROR);
 706 }
 707
 708 struct fc_function_template zfcp_transport_functions = {
 709         .show_starget_port_id = 1,
 710         .show_starget_port_name = 1,
 711         .show_starget_node_name = 1,
 712         .show_rport_supported_classes = 1,
 713         .show_rport_maxframe_size = 1,
 714         .show_rport_dev_loss_tmo = 1,
 715         .show_host_node_name = 1,
 716         .show_host_port_name = 1,
 717         .show_host_permanent_port_name = 1,
 718         .show_host_supported_classes = 1,
 719         .show_host_supported_fc4s = 1,
 720         .show_host_supported_speeds = 1,
 721         .show_host_maxframe_size = 1,
 722         .show_host_serial_number = 1,
 723         .get_fc_host_stats = zfcp_get_fc_host_stats,
 724         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 725         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 726         .get_host_port_state = zfcp_get_host_port_state,
 727         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 728         .show_host_port_state = 1,
 729         .show_host_active_fc4s = 1,
 730         .bsg_request = zfcp_fc_exec_bsg_job,
 731         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 732         /* no functions registered for following dynamic attributes but
 733            directly set by LLDD */
 734         .show_host_port_type = 1,
 735         .show_host_speed = 1,
 736         .show_host_port_id = 1,
 737         .disable_target_scan = 1,
 738         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 739 };
 740
 741 struct zfcp_data zfcp_data = {
 742         .scsi_host_template = {
 743                 .name                    = "zfcp",
 744                 .module                  = THIS_MODULE,
 745                 .proc_name               = "zfcp",
 746                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 747                 .slave_alloc             = zfcp_scsi_slave_alloc,
 748                 .slave_configure         = zfcp_scsi_slave_configure,
 749                 .slave_destroy           = zfcp_scsi_slave_destroy,
 750                 .queuecommand            = zfcp_scsi_queuecommand,
 751                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 752                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 753                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 754                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 755                 .can_queue               = 4096,
 756                 .this_id                 = -1,
 757                 .sg_tablesize            = ZFCP_QDIO_MAX_SBALES_PER_REQ,
 758                 .cmd_per_lun             = 1,
 759                 .use_clustering          = 1,
 760                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 761                 .max_sectors             = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8),
 762                 .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 763                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 764         },
 765 };