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 <linux/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 module_param_named(dif, enable_dif, bool, 0400);
  28 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  29
  30 static bool allow_lun_scan = 1;
  31 module_param(allow_lun_scan, bool, 0600);
  32 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  33
  34 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  35                                         int reason)
  36 {
  37         switch (reason) {
  38         case SCSI_QDEPTH_DEFAULT:
  39                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  40                 break;
  41         case SCSI_QDEPTH_QFULL:
  42                 scsi_track_queue_full(sdev, depth);
  43                 break;
  44         case SCSI_QDEPTH_RAMP_UP:
  45                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  46                 break;
  47         default:
  48                 return -EOPNOTSUPP;
  49         }
  50         return sdev->queue_depth;
  51 }
  52
  53 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  54 {
  55         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  56
  57         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  58         put_device(&zfcp_sdev->port->dev);
  59 }
  60
  61 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  62 {
  63         if (sdp->tagged_supported)
  64                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  65         else
  66                 scsi_adjust_queue_depth(sdp, 0, 1);
  67         return 0;
  68 }
  69
  70 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  71 {
  72         set_host_byte(scpnt, result);
  73         zfcp_dbf_scsi_fail_send(scpnt);
  74         scpnt->scsi_done(scpnt);
  75 }
  76
  77 static
  78 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  79 {
  80         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  81         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  82         int    status, scsi_result, ret;
  83
  84         /* reset the status for this request */
  85         scpnt->result = 0;
  86         scpnt->host_scribble = NULL;
  87
  88         scsi_result = fc_remote_port_chkready(rport);
  89         if (unlikely(scsi_result)) {
  90                 scpnt->result = scsi_result;
  91                 zfcp_dbf_scsi_fail_send(scpnt);
  92                 scpnt->scsi_done(scpnt);
  93                 return 0;
  94         }
  95
  96         status = atomic_read(&zfcp_sdev->status);
  97         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  98                      !(atomic_read(&zfcp_sdev->port->status) &
  99                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 100                 /* only LUN access denied, but port is good
 101                  * not covered by FC transport, have to fail here */
 102                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 103                 return 0;
 104         }
 105
 106         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 107                 /* This could be either
 108                  * open LUN pending: this is temporary, will result in
 109                  *      open LUN or ERP_FAILED, so retry command
 110                  * call to rport_delete pending: mimic retry from
 111                  *      fc_remote_port_chkready until rport is BLOCKED
 112                  */
 113                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 114                 return 0;
 115         }
 116
 117         ret = zfcp_fsf_fcp_cmnd(scpnt);
 118         if (unlikely(ret == -EBUSY))
 119                 return SCSI_MLQUEUE_DEVICE_BUSY;
 120         else if (unlikely(ret < 0))
 121                 return SCSI_MLQUEUE_HOST_BUSY;
 122
 123         return ret;
 124 }
 125
 126 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 127 {
 128         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 129         struct zfcp_adapter *adapter =
 130                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 131         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 132         struct zfcp_port *port;
 133         struct zfcp_unit *unit;
 134         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 135
 136         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 137         if (!port)
 138                 return -ENXIO;
 139
 140         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 141         if (unit)
 142                 put_device(&unit->dev);
 143
 144         if (!unit && !(allow_lun_scan && npiv)) {
 145                 put_device(&port->dev);
 146                 return -ENXIO;
 147         }
 148
 149         zfcp_sdev->port = port;
 150         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 151         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 152         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 153         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 154         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 155         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 156         spin_lock_init(&zfcp_sdev->latencies.lock);
 157
 158         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 159         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 160         zfcp_erp_wait(port->adapter);
 161
 162         return 0;
 163 }
 164
 165 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 166 {
 167         struct Scsi_Host *scsi_host = scpnt->device->host;
 168         struct zfcp_adapter *adapter =
 169                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 170         struct zfcp_fsf_req *old_req, *abrt_req;
 171         unsigned long flags;
 172         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 173         int retval = SUCCESS, ret;
 174         int retry = 3;
 175         char *dbf_tag;
 176
 177         /* avoid race condition between late normal completion and abort */
 178         write_lock_irqsave(&adapter->abort_lock, flags);
 179
 180         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 181         if (!old_req) {
 182                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 183                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 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_cmnd(scpnt);
 193                 if (abrt_req)
 194                         break;
 195
 196                 zfcp_erp_wait(adapter);
 197                 ret = fc_block_scsi_eh(scpnt);
 198                 if (ret) {
 199                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 200                         return ret;
 201                 }
 202                 if (!(atomic_read(&adapter->status) &
 203                       ZFCP_STATUS_COMMON_RUNNING)) {
 204                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 205                         return SUCCESS;
 206                 }
 207         }
 208         if (!abrt_req) {
 209                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 210                 return FAILED;
 211         }
 212
 213         wait_for_completion(&abrt_req->completion);
 214
 215         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 216                 dbf_tag = "abrt_ok";
 217         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 218                 dbf_tag = "abrt_nn";
 219         else {
 220                 dbf_tag = "abrt_fa";
 221                 retval = FAILED;
 222         }
 223         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 224         zfcp_fsf_req_free(abrt_req);
 225         return retval;
 226 }
 227
 228 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 229 {
 230         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 231         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 232         struct zfcp_fsf_req *fsf_req = NULL;
 233         int retval = SUCCESS, ret;
 234         int retry = 3;
 235
 236         while (retry--) {
 237                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 238                 if (fsf_req)
 239                         break;
 240
 241                 zfcp_erp_wait(adapter);
 242                 ret = fc_block_scsi_eh(scpnt);
 243                 if (ret)
 244                         return ret;
 245
 246                 if (!(atomic_read(&adapter->status) &
 247                       ZFCP_STATUS_COMMON_RUNNING)) {
 248                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 249                         return SUCCESS;
 250                 }
 251         }
 252         if (!fsf_req)
 253                 return FAILED;
 254
 255         wait_for_completion(&fsf_req->completion);
 256
 257         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 258                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 259                 retval = FAILED;
 260         } else
 261                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 262
 263         zfcp_fsf_req_free(fsf_req);
 264         return retval;
 265 }
 266
 267 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 268 {
 269         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 270 }
 271
 272 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 273 {
 274         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 275 }
 276
 277 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 278 {
 279         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 280         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 281         int ret;
 282
 283         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 284         zfcp_erp_wait(adapter);
 285         ret = fc_block_scsi_eh(scpnt);
 286         if (ret)
 287                 return ret;
 288
 289         return SUCCESS;
 290 }
 291
 292 struct scsi_transport_template *zfcp_scsi_transport_template;
 293
 294 static struct scsi_host_template zfcp_scsi_host_template = {
 295         .module                  = THIS_MODULE,
 296         .name                    = "zfcp",
 297         .queuecommand            = zfcp_scsi_queuecommand,
 298         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 299         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 300         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 301         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 302         .slave_alloc             = zfcp_scsi_slave_alloc,
 303         .slave_configure         = zfcp_scsi_slave_configure,
 304         .slave_destroy           = zfcp_scsi_slave_destroy,
 305         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 306         .proc_name               = "zfcp",
 307         .can_queue               = 4096,
 308         .this_id                 = -1,
 309         .sg_tablesize            = 1, /* adjusted later */
 310         .max_sectors             = 8, /* adjusted later */
 311         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 312         .cmd_per_lun             = 1,
 313         .use_clustering          = 1,
 314         .shost_attrs             = zfcp_sysfs_shost_attrs,
 315         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 316 };
 317
 318 /**
 319  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 320  * @adapter: The zfcp adapter to register with the SCSI midlayer
 321  */
 322 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 323 {
 324         struct ccw_dev_id dev_id;
 325
 326         if (adapter->scsi_host)
 327                 return 0;
 328
 329         ccw_device_get_id(adapter->ccw_device, &dev_id);
 330         /* register adapter as SCSI host with mid layer of SCSI stack */
 331         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 332                                              sizeof (struct zfcp_adapter *));
 333         if (!adapter->scsi_host) {
 334                 dev_err(&adapter->ccw_device->dev,
 335                         "Registering the FCP device with the "
 336                         "SCSI stack failed\n");
 337                 return -EIO;
 338         }
 339
 340         /* tell the SCSI stack some characteristics of this adapter */
 341         adapter->scsi_host->max_id = 511;
 342         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 343         adapter->scsi_host->max_channel = 0;
 344         adapter->scsi_host->unique_id = dev_id.devno;
 345         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 346         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 347
 348         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 349
 350         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 351                 scsi_host_put(adapter->scsi_host);
 352                 return -EIO;
 353         }
 354
 355         return 0;
 356 }
 357
 358 /**
 359  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 360  * @adapter: The zfcp adapter to unregister.
 361  */
 362 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 363 {
 364         struct Scsi_Host *shost;
 365         struct zfcp_port *port;
 366
 367         shost = adapter->scsi_host;
 368         if (!shost)
 369                 return;
 370
 371         read_lock_irq(&adapter->port_list_lock);
 372         list_for_each_entry(port, &adapter->port_list, list)
 373                 port->rport = NULL;
 374         read_unlock_irq(&adapter->port_list_lock);
 375
 376         fc_remove_host(shost);
 377         scsi_remove_host(shost);
 378         scsi_host_put(shost);
 379         adapter->scsi_host = NULL;
 380 }
 381
 382 static struct fc_host_statistics*
 383 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 384 {
 385         struct fc_host_statistics *fc_stats;
 386
 387         if (!adapter->fc_stats) {
 388                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 389                 if (!fc_stats)
 390                         return NULL;
 391                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 392         }
 393         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 394         return adapter->fc_stats;
 395 }
 396
 397 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 398                                       struct fsf_qtcb_bottom_port *data,
 399                                       struct fsf_qtcb_bottom_port *old)
 400 {
 401         fc_stats->seconds_since_last_reset =
 402                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 403         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 404         fc_stats->tx_words = data->tx_words - old->tx_words;
 405         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 406         fc_stats->rx_words = data->rx_words - old->rx_words;
 407         fc_stats->lip_count = data->lip - old->lip;
 408         fc_stats->nos_count = data->nos - old->nos;
 409         fc_stats->error_frames = data->error_frames - old->error_frames;
 410         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 411         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 412         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 413         fc_stats->loss_of_signal_count =
 414                 data->loss_of_signal - old->loss_of_signal;
 415         fc_stats->prim_seq_protocol_err_count =
 416                 data->psp_error_counts - old->psp_error_counts;
 417         fc_stats->invalid_tx_word_count =
 418                 data->invalid_tx_words - old->invalid_tx_words;
 419         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 420         fc_stats->fcp_input_requests =
 421                 data->input_requests - old->input_requests;
 422         fc_stats->fcp_output_requests =
 423                 data->output_requests - old->output_requests;
 424         fc_stats->fcp_control_requests =
 425                 data->control_requests - old->control_requests;
 426         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 427         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 428 }
 429
 430 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 431                                    struct fsf_qtcb_bottom_port *data)
 432 {
 433         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 434         fc_stats->tx_frames = data->tx_frames;
 435         fc_stats->tx_words = data->tx_words;
 436         fc_stats->rx_frames = data->rx_frames;
 437         fc_stats->rx_words = data->rx_words;
 438         fc_stats->lip_count = data->lip;
 439         fc_stats->nos_count = data->nos;
 440         fc_stats->error_frames = data->error_frames;
 441         fc_stats->dumped_frames = data->dumped_frames;
 442         fc_stats->link_failure_count = data->link_failure;
 443         fc_stats->loss_of_sync_count = data->loss_of_sync;
 444         fc_stats->loss_of_signal_count = data->loss_of_signal;
 445         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 446         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 447         fc_stats->invalid_crc_count = data->invalid_crcs;
 448         fc_stats->fcp_input_requests = data->input_requests;
 449         fc_stats->fcp_output_requests = data->output_requests;
 450         fc_stats->fcp_control_requests = data->control_requests;
 451         fc_stats->fcp_input_megabytes = data->input_mb;
 452         fc_stats->fcp_output_megabytes = data->output_mb;
 453 }
 454
 455 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 456 {
 457         struct zfcp_adapter *adapter;
 458         struct fc_host_statistics *fc_stats;
 459         struct fsf_qtcb_bottom_port *data;
 460         int ret;
 461
 462         adapter = (struct zfcp_adapter *)host->hostdata[0];
 463         fc_stats = zfcp_init_fc_host_stats(adapter);
 464         if (!fc_stats)
 465                 return NULL;
 466
 467         data = kzalloc(sizeof(*data), GFP_KERNEL);
 468         if (!data)
 469                 return NULL;
 470
 471         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 472         if (ret) {
 473                 kfree(data);
 474                 return NULL;
 475         }
 476
 477         if (adapter->stats_reset &&
 478             ((jiffies/HZ - adapter->stats_reset) <
 479              data->seconds_since_last_reset))
 480                 zfcp_adjust_fc_host_stats(fc_stats, data,
 481                                           adapter->stats_reset_data);
 482         else
 483                 zfcp_set_fc_host_stats(fc_stats, data);
 484
 485         kfree(data);
 486         return fc_stats;
 487 }
 488
 489 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 490 {
 491         struct zfcp_adapter *adapter;
 492         struct fsf_qtcb_bottom_port *data;
 493         int ret;
 494
 495         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 496         data = kzalloc(sizeof(*data), GFP_KERNEL);
 497         if (!data)
 498                 return;
 499
 500         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 501         if (ret)
 502                 kfree(data);
 503         else {
 504                 adapter->stats_reset = jiffies/HZ;
 505                 kfree(adapter->stats_reset_data);
 506                 adapter->stats_reset_data = data; /* finally freed in
 507                                                      adapter_release */
 508         }
 509 }
 510
 511 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 512 {
 513         struct zfcp_adapter *adapter =
 514                 (struct zfcp_adapter *)shost->hostdata[0];
 515         int status = atomic_read(&adapter->status);
 516
 517         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 518             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 519                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 520         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 521                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 522         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 523                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 524         else
 525                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 526 }
 527
 528 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 529 {
 530         rport->dev_loss_tmo = timeout;
 531 }
 532
 533 /**
 534  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 535  * @rport: The FC rport where to teminate I/O
 536  *
 537  * Abort all pending SCSI commands for a port by closing the
 538  * port. Using a reopen avoids a conflict with a shutdown
 539  * overwriting a reopen. The "forced" ensures that a disappeared port
 540  * is not opened again as valid due to the cached plogi data in
 541  * non-NPIV mode.
 542  */
 543 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 544 {
 545         struct zfcp_port *port;
 546         struct Scsi_Host *shost = rport_to_shost(rport);
 547         struct zfcp_adapter *adapter =
 548                 (struct zfcp_adapter *)shost->hostdata[0];
 549
 550         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 551
 552         if (port) {
 553                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 554                 put_device(&port->dev);
 555         }
 556 }
 557
 558 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 559 {
 560         struct fc_rport_identifiers ids;
 561         struct fc_rport *rport;
 562
 563         if (port->rport)
 564                 return;
 565
 566         ids.node_name = port->wwnn;
 567         ids.port_name = port->wwpn;
 568         ids.port_id = port->d_id;
 569         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 570
 571         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 572         if (!rport) {
 573                 dev_err(&port->adapter->ccw_device->dev,
 574                         "Registering port 0x%016Lx failed\n",
 575                         (unsigned long long)port->wwpn);
 576                 return;
 577         }
 578
 579         rport->maxframe_size = port->maxframe_size;
 580         rport->supported_classes = port->supported_classes;
 581         port->rport = rport;
 582         port->starget_id = rport->scsi_target_id;
 583
 584         zfcp_unit_queue_scsi_scan(port);
 585 }
 586
 587 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 588 {
 589         struct fc_rport *rport = port->rport;
 590
 591         if (rport) {
 592                 fc_remote_port_delete(rport);
 593                 port->rport = NULL;
 594         }
 595 }
 596
 597 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 598 {
 599         get_device(&port->dev);
 600         port->rport_task = RPORT_ADD;
 601
 602         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 603                 put_device(&port->dev);
 604 }
 605
 606 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 607 {
 608         get_device(&port->dev);
 609         port->rport_task = RPORT_DEL;
 610
 611         if (port->rport && queue_work(port->adapter->work_queue,
 612                                       &port->rport_work))
 613                 return;
 614
 615         put_device(&port->dev);
 616 }
 617
 618 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 619 {
 620         unsigned long flags;
 621         struct zfcp_port *port;
 622
 623         read_lock_irqsave(&adapter->port_list_lock, flags);
 624         list_for_each_entry(port, &adapter->port_list, list)
 625                 zfcp_scsi_schedule_rport_block(port);
 626         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 627 }
 628
 629 void zfcp_scsi_rport_work(struct work_struct *work)
 630 {
 631         struct zfcp_port *port = container_of(work, struct zfcp_port,
 632                                               rport_work);
 633
 634         while (port->rport_task) {
 635                 if (port->rport_task == RPORT_ADD) {
 636                         port->rport_task = RPORT_NONE;
 637                         zfcp_scsi_rport_register(port);
 638                 } else {
 639                         port->rport_task = RPORT_NONE;
 640                         zfcp_scsi_rport_block(port);
 641                 }
 642         }
 643
 644         put_device(&port->dev);
 645 }
 646
 647 /**
 648  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 649  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 650  */
 651 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 652 {
 653         unsigned int mask = 0;
 654         unsigned int data_div;
 655         struct Scsi_Host *shost = adapter->scsi_host;
 656
 657         data_div = atomic_read(&adapter->status) &
 658                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 659
 660         if (enable_dif &&
 661             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 662                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 663
 664         if (enable_dif && data_div &&
 665             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 666                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 667                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 668                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 669                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 670                 shost->max_sectors = shost->sg_tablesize * 8;
 671         }
 672
 673         scsi_host_set_prot(shost, mask);
 674 }
 675
 676 /**
 677  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 678  * @scmd: The SCSI command to report the error for
 679  * @ascq: The ASCQ to put in the sense buffer
 680  *
 681  * See the error handling in sd_done for the sense codes used here.
 682  * Set DID_SOFT_ERROR to retry the request, if possible.
 683  */
 684 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 685 {
 686         scsi_build_sense_buffer(1, scmd->sense_buffer,
 687                                 ILLEGAL_REQUEST, 0x10, ascq);
 688         set_driver_byte(scmd, DRIVER_SENSE);
 689         scmd->result |= SAM_STAT_CHECK_CONDITION;
 690         set_host_byte(scmd, DID_SOFT_ERROR);
 691 }
 692
 693 struct fc_function_template zfcp_transport_functions = {
 694         .show_starget_port_id = 1,
 695         .show_starget_port_name = 1,
 696         .show_starget_node_name = 1,
 697         .show_rport_supported_classes = 1,
 698         .show_rport_maxframe_size = 1,
 699         .show_rport_dev_loss_tmo = 1,
 700         .show_host_node_name = 1,
 701         .show_host_port_name = 1,
 702         .show_host_permanent_port_name = 1,
 703         .show_host_supported_classes = 1,
 704         .show_host_supported_fc4s = 1,
 705         .show_host_supported_speeds = 1,
 706         .show_host_maxframe_size = 1,
 707         .show_host_serial_number = 1,
 708         .get_fc_host_stats = zfcp_get_fc_host_stats,
 709         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 710         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 711         .get_host_port_state = zfcp_get_host_port_state,
 712         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 713         .show_host_port_state = 1,
 714         .show_host_active_fc4s = 1,
 715         .bsg_request = zfcp_fc_exec_bsg_job,
 716         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 717         /* no functions registered for following dynamic attributes but
 718            directly set by LLDD */
 719         .show_host_port_type = 1,
 720         .show_host_symbolic_name = 1,
 721         .show_host_speed = 1,
 722         .show_host_port_id = 1,
 723         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 724 };