drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corp. 2002, 2013
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/slab.h>
  15 #include <scsi/fc/fc_fcp.h>
  16 #include <scsi/scsi_eh.h>
  17 #include <linux/atomic.h>
  18 #include "zfcp_ext.h"
  19 #include "zfcp_dbf.h"
  20 #include "zfcp_fc.h"
  21 #include "zfcp_reqlist.h"
  22
  23 static unsigned int default_depth = 32;
  24 module_param_named(queue_depth, default_depth, uint, 0600);
  25 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  26
  27 static bool enable_dif;
  28 module_param_named(dif, enable_dif, bool, 0400);
  29 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  30
  31 static bool allow_lun_scan = 1;
  32 module_param(allow_lun_scan, bool, 0600);
  33 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  34
  35 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  36                                         int reason)
  37 {
  38         scsi_adjust_queue_depth(sdev, depth);
  39         return sdev->queue_depth;
  40 }
  41
  42 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  43 {
  44         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  45
  46         /* if previous slave_alloc returned early, there is nothing to do */
  47         if (!zfcp_sdev->port)
  48                 return;
  49
  50         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  51         put_device(&zfcp_sdev->port->dev);
  52 }
  53
  54 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  55 {
  56         if (sdp->tagged_supported)
  57                 scsi_adjust_queue_depth(sdp, default_depth);
  58         return 0;
  59 }
  60
  61 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  62 {
  63         set_host_byte(scpnt, result);
  64         zfcp_dbf_scsi_fail_send(scpnt);
  65         scpnt->scsi_done(scpnt);
  66 }
  67
  68 static
  69 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  70 {
  71         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  72         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  73         int    status, scsi_result, ret;
  74
  75         /* reset the status for this request */
  76         scpnt->result = 0;
  77         scpnt->host_scribble = NULL;
  78
  79         scsi_result = fc_remote_port_chkready(rport);
  80         if (unlikely(scsi_result)) {
  81                 scpnt->result = scsi_result;
  82                 zfcp_dbf_scsi_fail_send(scpnt);
  83                 scpnt->scsi_done(scpnt);
  84                 return 0;
  85         }
  86
  87         status = atomic_read(&zfcp_sdev->status);
  88         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  89                      !(atomic_read(&zfcp_sdev->port->status) &
  90                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
  91                 /* only LUN access denied, but port is good
  92                  * not covered by FC transport, have to fail here */
  93                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  94                 return 0;
  95         }
  96
  97         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  98                 /* This could be either
  99                  * open LUN pending: this is temporary, will result in
 100                  *      open LUN or ERP_FAILED, so retry command
 101                  * call to rport_delete pending: mimic retry from
 102                  *      fc_remote_port_chkready until rport is BLOCKED
 103                  */
 104                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 105                 return 0;
 106         }
 107
 108         ret = zfcp_fsf_fcp_cmnd(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 int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 118 {
 119         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 120         struct zfcp_adapter *adapter =
 121                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 122         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 123         struct zfcp_port *port;
 124         struct zfcp_unit *unit;
 125         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 126
 127         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 128         if (!port)
 129                 return -ENXIO;
 130
 131         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 132         if (unit)
 133                 put_device(&unit->dev);
 134
 135         if (!unit && !(allow_lun_scan && npiv)) {
 136                 put_device(&port->dev);
 137                 return -ENXIO;
 138         }
 139
 140         zfcp_sdev->port = port;
 141         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 142         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 143         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 144         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 145         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 146         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 147         spin_lock_init(&zfcp_sdev->latencies.lock);
 148
 149         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 150         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 151         zfcp_erp_wait(port->adapter);
 152
 153         return 0;
 154 }
 155
 156 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 157 {
 158         struct Scsi_Host *scsi_host = scpnt->device->host;
 159         struct zfcp_adapter *adapter =
 160                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 161         struct zfcp_fsf_req *old_req, *abrt_req;
 162         unsigned long flags;
 163         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 164         int retval = SUCCESS, ret;
 165         int retry = 3;
 166         char *dbf_tag;
 167
 168         /* avoid race condition between late normal completion and abort */
 169         write_lock_irqsave(&adapter->abort_lock, flags);
 170
 171         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 172         if (!old_req) {
 173                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 174                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 175                 return FAILED; /* completion could be in progress */
 176         }
 177         old_req->data = NULL;
 178
 179         /* don't access old fsf_req after releasing the abort_lock */
 180         write_unlock_irqrestore(&adapter->abort_lock, flags);
 181
 182         while (retry--) {
 183                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 184                 if (abrt_req)
 185                         break;
 186
 187                 zfcp_erp_wait(adapter);
 188                 ret = fc_block_scsi_eh(scpnt);
 189                 if (ret) {
 190                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 191                         return ret;
 192                 }
 193                 if (!(atomic_read(&adapter->status) &
 194                       ZFCP_STATUS_COMMON_RUNNING)) {
 195                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 196                         return SUCCESS;
 197                 }
 198         }
 199         if (!abrt_req) {
 200                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 201                 return FAILED;
 202         }
 203
 204         wait_for_completion(&abrt_req->completion);
 205
 206         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 207                 dbf_tag = "abrt_ok";
 208         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 209                 dbf_tag = "abrt_nn";
 210         else {
 211                 dbf_tag = "abrt_fa";
 212                 retval = FAILED;
 213         }
 214         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 215         zfcp_fsf_req_free(abrt_req);
 216         return retval;
 217 }
 218
 219 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 220 {
 221         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 222         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 223         struct zfcp_fsf_req *fsf_req = NULL;
 224         int retval = SUCCESS, ret;
 225         int retry = 3;
 226
 227         while (retry--) {
 228                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 229                 if (fsf_req)
 230                         break;
 231
 232                 zfcp_erp_wait(adapter);
 233                 ret = fc_block_scsi_eh(scpnt);
 234                 if (ret)
 235                         return ret;
 236
 237                 if (!(atomic_read(&adapter->status) &
 238                       ZFCP_STATUS_COMMON_RUNNING)) {
 239                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 240                         return SUCCESS;
 241                 }
 242         }
 243         if (!fsf_req)
 244                 return FAILED;
 245
 246         wait_for_completion(&fsf_req->completion);
 247
 248         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 249                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 250                 retval = FAILED;
 251         } else
 252                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 253
 254         zfcp_fsf_req_free(fsf_req);
 255         return retval;
 256 }
 257
 258 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 259 {
 260         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 261 }
 262
 263 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 264 {
 265         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 266 }
 267
 268 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 269 {
 270         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 271         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 272         int ret;
 273
 274         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 275         zfcp_erp_wait(adapter);
 276         ret = fc_block_scsi_eh(scpnt);
 277         if (ret)
 278                 return ret;
 279
 280         return SUCCESS;
 281 }
 282
 283 struct scsi_transport_template *zfcp_scsi_transport_template;
 284
 285 static struct scsi_host_template zfcp_scsi_host_template = {
 286         .module                  = THIS_MODULE,
 287         .name                    = "zfcp",
 288         .queuecommand            = zfcp_scsi_queuecommand,
 289         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 290         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 291         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 292         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 293         .slave_alloc             = zfcp_scsi_slave_alloc,
 294         .slave_configure         = zfcp_scsi_slave_configure,
 295         .slave_destroy           = zfcp_scsi_slave_destroy,
 296         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 297         .proc_name               = "zfcp",
 298         .can_queue               = 4096,
 299         .this_id                 = -1,
 300         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 301                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 302                                    /* GCD, adjusted later */
 303         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 304                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 305                                    /* GCD, adjusted later */
 306         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 307         .cmd_per_lun             = 1,
 308         .use_clustering          = 1,
 309         .shost_attrs             = zfcp_sysfs_shost_attrs,
 310         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 311         .track_queue_depth       = 1,
 312 };
 313
 314 /**
 315  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 316  * @adapter: The zfcp adapter to register with the SCSI midlayer
 317  */
 318 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 319 {
 320         struct ccw_dev_id dev_id;
 321
 322         if (adapter->scsi_host)
 323                 return 0;
 324
 325         ccw_device_get_id(adapter->ccw_device, &dev_id);
 326         /* register adapter as SCSI host with mid layer of SCSI stack */
 327         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 328                                              sizeof (struct zfcp_adapter *));
 329         if (!adapter->scsi_host) {
 330                 dev_err(&adapter->ccw_device->dev,
 331                         "Registering the FCP device with the "
 332                         "SCSI stack failed\n");
 333                 return -EIO;
 334         }
 335
 336         /* tell the SCSI stack some characteristics of this adapter */
 337         adapter->scsi_host->max_id = 511;
 338         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 339         adapter->scsi_host->max_channel = 0;
 340         adapter->scsi_host->unique_id = dev_id.devno;
 341         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 342         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 343
 344         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 345
 346         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 347                 scsi_host_put(adapter->scsi_host);
 348                 return -EIO;
 349         }
 350
 351         return 0;
 352 }
 353
 354 /**
 355  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 356  * @adapter: The zfcp adapter to unregister.
 357  */
 358 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 359 {
 360         struct Scsi_Host *shost;
 361         struct zfcp_port *port;
 362
 363         shost = adapter->scsi_host;
 364         if (!shost)
 365                 return;
 366
 367         read_lock_irq(&adapter->port_list_lock);
 368         list_for_each_entry(port, &adapter->port_list, list)
 369                 port->rport = NULL;
 370         read_unlock_irq(&adapter->port_list_lock);
 371
 372         fc_remove_host(shost);
 373         scsi_remove_host(shost);
 374         scsi_host_put(shost);
 375         adapter->scsi_host = NULL;
 376 }
 377
 378 static struct fc_host_statistics*
 379 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 380 {
 381         struct fc_host_statistics *fc_stats;
 382
 383         if (!adapter->fc_stats) {
 384                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 385                 if (!fc_stats)
 386                         return NULL;
 387                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 388         }
 389         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 390         return adapter->fc_stats;
 391 }
 392
 393 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 394                                       struct fsf_qtcb_bottom_port *data,
 395                                       struct fsf_qtcb_bottom_port *old)
 396 {
 397         fc_stats->seconds_since_last_reset =
 398                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 399         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 400         fc_stats->tx_words = data->tx_words - old->tx_words;
 401         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 402         fc_stats->rx_words = data->rx_words - old->rx_words;
 403         fc_stats->lip_count = data->lip - old->lip;
 404         fc_stats->nos_count = data->nos - old->nos;
 405         fc_stats->error_frames = data->error_frames - old->error_frames;
 406         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 407         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 408         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 409         fc_stats->loss_of_signal_count =
 410                 data->loss_of_signal - old->loss_of_signal;
 411         fc_stats->prim_seq_protocol_err_count =
 412                 data->psp_error_counts - old->psp_error_counts;
 413         fc_stats->invalid_tx_word_count =
 414                 data->invalid_tx_words - old->invalid_tx_words;
 415         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 416         fc_stats->fcp_input_requests =
 417                 data->input_requests - old->input_requests;
 418         fc_stats->fcp_output_requests =
 419                 data->output_requests - old->output_requests;
 420         fc_stats->fcp_control_requests =
 421                 data->control_requests - old->control_requests;
 422         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 423         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 424 }
 425
 426 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 427                                    struct fsf_qtcb_bottom_port *data)
 428 {
 429         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 430         fc_stats->tx_frames = data->tx_frames;
 431         fc_stats->tx_words = data->tx_words;
 432         fc_stats->rx_frames = data->rx_frames;
 433         fc_stats->rx_words = data->rx_words;
 434         fc_stats->lip_count = data->lip;
 435         fc_stats->nos_count = data->nos;
 436         fc_stats->error_frames = data->error_frames;
 437         fc_stats->dumped_frames = data->dumped_frames;
 438         fc_stats->link_failure_count = data->link_failure;
 439         fc_stats->loss_of_sync_count = data->loss_of_sync;
 440         fc_stats->loss_of_signal_count = data->loss_of_signal;
 441         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 442         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 443         fc_stats->invalid_crc_count = data->invalid_crcs;
 444         fc_stats->fcp_input_requests = data->input_requests;
 445         fc_stats->fcp_output_requests = data->output_requests;
 446         fc_stats->fcp_control_requests = data->control_requests;
 447         fc_stats->fcp_input_megabytes = data->input_mb;
 448         fc_stats->fcp_output_megabytes = data->output_mb;
 449 }
 450
 451 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 452 {
 453         struct zfcp_adapter *adapter;
 454         struct fc_host_statistics *fc_stats;
 455         struct fsf_qtcb_bottom_port *data;
 456         int ret;
 457
 458         adapter = (struct zfcp_adapter *)host->hostdata[0];
 459         fc_stats = zfcp_init_fc_host_stats(adapter);
 460         if (!fc_stats)
 461                 return NULL;
 462
 463         data = kzalloc(sizeof(*data), GFP_KERNEL);
 464         if (!data)
 465                 return NULL;
 466
 467         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 468         if (ret) {
 469                 kfree(data);
 470                 return NULL;
 471         }
 472
 473         if (adapter->stats_reset &&
 474             ((jiffies/HZ - adapter->stats_reset) <
 475              data->seconds_since_last_reset))
 476                 zfcp_adjust_fc_host_stats(fc_stats, data,
 477                                           adapter->stats_reset_data);
 478         else
 479                 zfcp_set_fc_host_stats(fc_stats, data);
 480
 481         kfree(data);
 482         return fc_stats;
 483 }
 484
 485 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 486 {
 487         struct zfcp_adapter *adapter;
 488         struct fsf_qtcb_bottom_port *data;
 489         int ret;
 490
 491         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 492         data = kzalloc(sizeof(*data), GFP_KERNEL);
 493         if (!data)
 494                 return;
 495
 496         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 497         if (ret)
 498                 kfree(data);
 499         else {
 500                 adapter->stats_reset = jiffies/HZ;
 501                 kfree(adapter->stats_reset_data);
 502                 adapter->stats_reset_data = data; /* finally freed in
 503                                                      adapter_release */
 504         }
 505 }
 506
 507 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 508 {
 509         struct zfcp_adapter *adapter =
 510                 (struct zfcp_adapter *)shost->hostdata[0];
 511         int status = atomic_read(&adapter->status);
 512
 513         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 514             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 515                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 516         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 517                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 518         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 519                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 520         else
 521                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 522 }
 523
 524 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 525 {
 526         rport->dev_loss_tmo = timeout;
 527 }
 528
 529 /**
 530  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 531  * @rport: The FC rport where to teminate I/O
 532  *
 533  * Abort all pending SCSI commands for a port by closing the
 534  * port. Using a reopen avoids a conflict with a shutdown
 535  * overwriting a reopen. The "forced" ensures that a disappeared port
 536  * is not opened again as valid due to the cached plogi data in
 537  * non-NPIV mode.
 538  */
 539 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 540 {
 541         struct zfcp_port *port;
 542         struct Scsi_Host *shost = rport_to_shost(rport);
 543         struct zfcp_adapter *adapter =
 544                 (struct zfcp_adapter *)shost->hostdata[0];
 545
 546         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 547
 548         if (port) {
 549                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 550                 put_device(&port->dev);
 551         }
 552 }
 553
 554 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 555 {
 556         struct fc_rport_identifiers ids;
 557         struct fc_rport *rport;
 558
 559         if (port->rport)
 560                 return;
 561
 562         ids.node_name = port->wwnn;
 563         ids.port_name = port->wwpn;
 564         ids.port_id = port->d_id;
 565         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 566
 567         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 568         if (!rport) {
 569                 dev_err(&port->adapter->ccw_device->dev,
 570                         "Registering port 0x%016Lx failed\n",
 571                         (unsigned long long)port->wwpn);
 572                 return;
 573         }
 574
 575         rport->maxframe_size = port->maxframe_size;
 576         rport->supported_classes = port->supported_classes;
 577         port->rport = rport;
 578         port->starget_id = rport->scsi_target_id;
 579
 580         zfcp_unit_queue_scsi_scan(port);
 581 }
 582
 583 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 584 {
 585         struct fc_rport *rport = port->rport;
 586
 587         if (rport) {
 588                 fc_remote_port_delete(rport);
 589                 port->rport = NULL;
 590         }
 591 }
 592
 593 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 594 {
 595         get_device(&port->dev);
 596         port->rport_task = RPORT_ADD;
 597
 598         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 599                 put_device(&port->dev);
 600 }
 601
 602 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 603 {
 604         get_device(&port->dev);
 605         port->rport_task = RPORT_DEL;
 606
 607         if (port->rport && queue_work(port->adapter->work_queue,
 608                                       &port->rport_work))
 609                 return;
 610
 611         put_device(&port->dev);
 612 }
 613
 614 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 615 {
 616         unsigned long flags;
 617         struct zfcp_port *port;
 618
 619         read_lock_irqsave(&adapter->port_list_lock, flags);
 620         list_for_each_entry(port, &adapter->port_list, list)
 621                 zfcp_scsi_schedule_rport_block(port);
 622         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 623 }
 624
 625 void zfcp_scsi_rport_work(struct work_struct *work)
 626 {
 627         struct zfcp_port *port = container_of(work, struct zfcp_port,
 628                                               rport_work);
 629
 630         while (port->rport_task) {
 631                 if (port->rport_task == RPORT_ADD) {
 632                         port->rport_task = RPORT_NONE;
 633                         zfcp_scsi_rport_register(port);
 634                 } else {
 635                         port->rport_task = RPORT_NONE;
 636                         zfcp_scsi_rport_block(port);
 637                 }
 638         }
 639
 640         put_device(&port->dev);
 641 }
 642
 643 /**
 644  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 645  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 646  */
 647 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 648 {
 649         unsigned int mask = 0;
 650         unsigned int data_div;
 651         struct Scsi_Host *shost = adapter->scsi_host;
 652
 653         data_div = atomic_read(&adapter->status) &
 654                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 655
 656         if (enable_dif &&
 657             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 658                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 659
 660         if (enable_dif && data_div &&
 661             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 662                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 663                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 664                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 665                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 666                 shost->max_sectors = shost->sg_tablesize * 8;
 667         }
 668
 669         scsi_host_set_prot(shost, mask);
 670 }
 671
 672 /**
 673  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 674  * @scmd: The SCSI command to report the error for
 675  * @ascq: The ASCQ to put in the sense buffer
 676  *
 677  * See the error handling in sd_done for the sense codes used here.
 678  * Set DID_SOFT_ERROR to retry the request, if possible.
 679  */
 680 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 681 {
 682         scsi_build_sense_buffer(1, scmd->sense_buffer,
 683                                 ILLEGAL_REQUEST, 0x10, ascq);
 684         set_driver_byte(scmd, DRIVER_SENSE);
 685         scmd->result |= SAM_STAT_CHECK_CONDITION;
 686         set_host_byte(scmd, DID_SOFT_ERROR);
 687 }
 688
 689 struct fc_function_template zfcp_transport_functions = {
 690         .show_starget_port_id = 1,
 691         .show_starget_port_name = 1,
 692         .show_starget_node_name = 1,
 693         .show_rport_supported_classes = 1,
 694         .show_rport_maxframe_size = 1,
 695         .show_rport_dev_loss_tmo = 1,
 696         .show_host_node_name = 1,
 697         .show_host_port_name = 1,
 698         .show_host_permanent_port_name = 1,
 699         .show_host_supported_classes = 1,
 700         .show_host_supported_fc4s = 1,
 701         .show_host_supported_speeds = 1,
 702         .show_host_maxframe_size = 1,
 703         .show_host_serial_number = 1,
 704         .get_fc_host_stats = zfcp_get_fc_host_stats,
 705         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 706         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 707         .get_host_port_state = zfcp_get_host_port_state,
 708         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 709         .show_host_port_state = 1,
 710         .show_host_active_fc4s = 1,
 711         .bsg_request = zfcp_fc_exec_bsg_job,
 712         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 713         /* no functions registered for following dynamic attributes but
 714            directly set by LLDD */
 715         .show_host_port_type = 1,
 716         .show_host_symbolic_name = 1,
 717         .show_host_speed = 1,
 718         .show_host_port_id = 1,
 719         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 720 };