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/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         switch (reason) {
  39         case SCSI_QDEPTH_DEFAULT:
  40                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  41                 break;
  42         case SCSI_QDEPTH_QFULL:
  43                 scsi_track_queue_full(sdev, depth);
  44                 break;
  45         case SCSI_QDEPTH_RAMP_UP:
  46                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  47                 break;
  48         default:
  49                 return -EOPNOTSUPP;
  50         }
  51         return sdev->queue_depth;
  52 }
  53
  54 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  55 {
  56         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  57
  58         /* if previous slave_alloc returned early, there is nothing to do */
  59         if (!zfcp_sdev->port)
  60                 return;
  61
  62         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  63         put_device(&zfcp_sdev->port->dev);
  64 }
  65
  66 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  67 {
  68         if (sdp->tagged_supported)
  69                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  70         else
  71                 scsi_adjust_queue_depth(sdp, 0, 1);
  72         return 0;
  73 }
  74
  75 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  76 {
  77         set_host_byte(scpnt, result);
  78         zfcp_dbf_scsi_fail_send(scpnt);
  79         scpnt->scsi_done(scpnt);
  80 }
  81
  82 static
  83 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  84 {
  85         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  86         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  87         int    status, scsi_result, ret;
  88
  89         /* reset the status for this request */
  90         scpnt->result = 0;
  91         scpnt->host_scribble = NULL;
  92
  93         scsi_result = fc_remote_port_chkready(rport);
  94         if (unlikely(scsi_result)) {
  95                 scpnt->result = scsi_result;
  96                 zfcp_dbf_scsi_fail_send(scpnt);
  97                 scpnt->scsi_done(scpnt);
  98                 return 0;
  99         }
 100
 101         status = atomic_read(&zfcp_sdev->status);
 102         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 103                      !(atomic_read(&zfcp_sdev->port->status) &
 104                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 105                 /* only LUN access denied, but port is good
 106                  * not covered by FC transport, have to fail here */
 107                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 108                 return 0;
 109         }
 110
 111         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 112                 /* This could be either
 113                  * open LUN pending: this is temporary, will result in
 114                  *      open LUN or ERP_FAILED, so retry command
 115                  * call to rport_delete pending: mimic retry from
 116                  *      fc_remote_port_chkready until rport is BLOCKED
 117                  */
 118                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 119                 return 0;
 120         }
 121
 122         ret = zfcp_fsf_fcp_cmnd(scpnt);
 123         if (unlikely(ret == -EBUSY))
 124                 return SCSI_MLQUEUE_DEVICE_BUSY;
 125         else if (unlikely(ret < 0))
 126                 return SCSI_MLQUEUE_HOST_BUSY;
 127
 128         return ret;
 129 }
 130
 131 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 132 {
 133         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 134         struct zfcp_adapter *adapter =
 135                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 136         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 137         struct zfcp_port *port;
 138         struct zfcp_unit *unit;
 139         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 140
 141         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 142         if (!port)
 143                 return -ENXIO;
 144
 145         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 146         if (unit)
 147                 put_device(&unit->dev);
 148
 149         if (!unit && !(allow_lun_scan && npiv)) {
 150                 put_device(&port->dev);
 151                 return -ENXIO;
 152         }
 153
 154         zfcp_sdev->port = port;
 155         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 157         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 158         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 159         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 160         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 161         spin_lock_init(&zfcp_sdev->latencies.lock);
 162
 163         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 164         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 165         zfcp_erp_wait(port->adapter);
 166
 167         return 0;
 168 }
 169
 170 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 171 {
 172         struct Scsi_Host *scsi_host = scpnt->device->host;
 173         struct zfcp_adapter *adapter =
 174                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 175         struct zfcp_fsf_req *old_req, *abrt_req;
 176         unsigned long flags;
 177         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 178         int retval = SUCCESS, ret;
 179         int retry = 3;
 180         char *dbf_tag;
 181
 182         /* avoid race condition between late normal completion and abort */
 183         write_lock_irqsave(&adapter->abort_lock, flags);
 184
 185         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 186         if (!old_req) {
 187                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 188                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 189                 return FAILED; /* completion could be in progress */
 190         }
 191         old_req->data = NULL;
 192
 193         /* don't access old fsf_req after releasing the abort_lock */
 194         write_unlock_irqrestore(&adapter->abort_lock, flags);
 195
 196         while (retry--) {
 197                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 198                 if (abrt_req)
 199                         break;
 200
 201                 zfcp_erp_wait(adapter);
 202                 ret = fc_block_scsi_eh(scpnt);
 203                 if (ret) {
 204                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 205                         return ret;
 206                 }
 207                 if (!(atomic_read(&adapter->status) &
 208                       ZFCP_STATUS_COMMON_RUNNING)) {
 209                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 210                         return SUCCESS;
 211                 }
 212         }
 213         if (!abrt_req) {
 214                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 215                 return FAILED;
 216         }
 217
 218         wait_for_completion(&abrt_req->completion);
 219
 220         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 221                 dbf_tag = "abrt_ok";
 222         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 223                 dbf_tag = "abrt_nn";
 224         else {
 225                 dbf_tag = "abrt_fa";
 226                 retval = FAILED;
 227         }
 228         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 229         zfcp_fsf_req_free(abrt_req);
 230         return retval;
 231 }
 232
 233 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 234 {
 235         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 236         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 237         struct zfcp_fsf_req *fsf_req = NULL;
 238         int retval = SUCCESS, ret;
 239         int retry = 3;
 240
 241         while (retry--) {
 242                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 243                 if (fsf_req)
 244                         break;
 245
 246                 zfcp_erp_wait(adapter);
 247                 ret = fc_block_scsi_eh(scpnt);
 248                 if (ret)
 249                         return ret;
 250
 251                 if (!(atomic_read(&adapter->status) &
 252                       ZFCP_STATUS_COMMON_RUNNING)) {
 253                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 254                         return SUCCESS;
 255                 }
 256         }
 257         if (!fsf_req)
 258                 return FAILED;
 259
 260         wait_for_completion(&fsf_req->completion);
 261
 262         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 263                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 264                 retval = FAILED;
 265         } else
 266                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 267
 268         zfcp_fsf_req_free(fsf_req);
 269         return retval;
 270 }
 271
 272 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 273 {
 274         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 275 }
 276
 277 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 278 {
 279         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 280 }
 281
 282 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 283 {
 284         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 285         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 286         int ret;
 287
 288         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 289         zfcp_erp_wait(adapter);
 290         ret = fc_block_scsi_eh(scpnt);
 291         if (ret)
 292                 return ret;
 293
 294         return SUCCESS;
 295 }
 296
 297 struct scsi_transport_template *zfcp_scsi_transport_template;
 298
 299 static struct scsi_host_template zfcp_scsi_host_template = {
 300         .module                  = THIS_MODULE,
 301         .name                    = "zfcp",
 302         .queuecommand            = zfcp_scsi_queuecommand,
 303         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 304         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 305         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 306         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 307         .slave_alloc             = zfcp_scsi_slave_alloc,
 308         .slave_configure         = zfcp_scsi_slave_configure,
 309         .slave_destroy           = zfcp_scsi_slave_destroy,
 310         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 311         .proc_name               = "zfcp",
 312         .can_queue               = 4096,
 313         .this_id                 = -1,
 314         .sg_tablesize            = 1, /* adjusted later */
 315         .max_sectors             = 8, /* adjusted later */
 316         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 317         .cmd_per_lun             = 1,
 318         .use_clustering          = 1,
 319         .shost_attrs             = zfcp_sysfs_shost_attrs,
 320         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 321 };
 322
 323 /**
 324  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 325  * @adapter: The zfcp adapter to register with the SCSI midlayer
 326  */
 327 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 328 {
 329         struct ccw_dev_id dev_id;
 330
 331         if (adapter->scsi_host)
 332                 return 0;
 333
 334         ccw_device_get_id(adapter->ccw_device, &dev_id);
 335         /* register adapter as SCSI host with mid layer of SCSI stack */
 336         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 337                                              sizeof (struct zfcp_adapter *));
 338         if (!adapter->scsi_host) {
 339                 dev_err(&adapter->ccw_device->dev,
 340                         "Registering the FCP device with the "
 341                         "SCSI stack failed\n");
 342                 return -EIO;
 343         }
 344
 345         /* tell the SCSI stack some characteristics of this adapter */
 346         adapter->scsi_host->max_id = 511;
 347         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 348         adapter->scsi_host->max_channel = 0;
 349         adapter->scsi_host->unique_id = dev_id.devno;
 350         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 351         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 352
 353         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 354
 355         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 356                 scsi_host_put(adapter->scsi_host);
 357                 return -EIO;
 358         }
 359
 360         return 0;
 361 }
 362
 363 /**
 364  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 365  * @adapter: The zfcp adapter to unregister.
 366  */
 367 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 368 {
 369         struct Scsi_Host *shost;
 370         struct zfcp_port *port;
 371
 372         shost = adapter->scsi_host;
 373         if (!shost)
 374                 return;
 375
 376         read_lock_irq(&adapter->port_list_lock);
 377         list_for_each_entry(port, &adapter->port_list, list)
 378                 port->rport = NULL;
 379         read_unlock_irq(&adapter->port_list_lock);
 380
 381         fc_remove_host(shost);
 382         scsi_remove_host(shost);
 383         scsi_host_put(shost);
 384         adapter->scsi_host = NULL;
 385 }
 386
 387 static struct fc_host_statistics*
 388 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 389 {
 390         struct fc_host_statistics *fc_stats;
 391
 392         if (!adapter->fc_stats) {
 393                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 394                 if (!fc_stats)
 395                         return NULL;
 396                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 397         }
 398         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 399         return adapter->fc_stats;
 400 }
 401
 402 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 403                                       struct fsf_qtcb_bottom_port *data,
 404                                       struct fsf_qtcb_bottom_port *old)
 405 {
 406         fc_stats->seconds_since_last_reset =
 407                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 408         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 409         fc_stats->tx_words = data->tx_words - old->tx_words;
 410         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 411         fc_stats->rx_words = data->rx_words - old->rx_words;
 412         fc_stats->lip_count = data->lip - old->lip;
 413         fc_stats->nos_count = data->nos - old->nos;
 414         fc_stats->error_frames = data->error_frames - old->error_frames;
 415         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 416         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 417         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 418         fc_stats->loss_of_signal_count =
 419                 data->loss_of_signal - old->loss_of_signal;
 420         fc_stats->prim_seq_protocol_err_count =
 421                 data->psp_error_counts - old->psp_error_counts;
 422         fc_stats->invalid_tx_word_count =
 423                 data->invalid_tx_words - old->invalid_tx_words;
 424         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 425         fc_stats->fcp_input_requests =
 426                 data->input_requests - old->input_requests;
 427         fc_stats->fcp_output_requests =
 428                 data->output_requests - old->output_requests;
 429         fc_stats->fcp_control_requests =
 430                 data->control_requests - old->control_requests;
 431         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 432         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 433 }
 434
 435 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 436                                    struct fsf_qtcb_bottom_port *data)
 437 {
 438         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 439         fc_stats->tx_frames = data->tx_frames;
 440         fc_stats->tx_words = data->tx_words;
 441         fc_stats->rx_frames = data->rx_frames;
 442         fc_stats->rx_words = data->rx_words;
 443         fc_stats->lip_count = data->lip;
 444         fc_stats->nos_count = data->nos;
 445         fc_stats->error_frames = data->error_frames;
 446         fc_stats->dumped_frames = data->dumped_frames;
 447         fc_stats->link_failure_count = data->link_failure;
 448         fc_stats->loss_of_sync_count = data->loss_of_sync;
 449         fc_stats->loss_of_signal_count = data->loss_of_signal;
 450         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 451         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 452         fc_stats->invalid_crc_count = data->invalid_crcs;
 453         fc_stats->fcp_input_requests = data->input_requests;
 454         fc_stats->fcp_output_requests = data->output_requests;
 455         fc_stats->fcp_control_requests = data->control_requests;
 456         fc_stats->fcp_input_megabytes = data->input_mb;
 457         fc_stats->fcp_output_megabytes = data->output_mb;
 458 }
 459
 460 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 461 {
 462         struct zfcp_adapter *adapter;
 463         struct fc_host_statistics *fc_stats;
 464         struct fsf_qtcb_bottom_port *data;
 465         int ret;
 466
 467         adapter = (struct zfcp_adapter *)host->hostdata[0];
 468         fc_stats = zfcp_init_fc_host_stats(adapter);
 469         if (!fc_stats)
 470                 return NULL;
 471
 472         data = kzalloc(sizeof(*data), GFP_KERNEL);
 473         if (!data)
 474                 return NULL;
 475
 476         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 477         if (ret) {
 478                 kfree(data);
 479                 return NULL;
 480         }
 481
 482         if (adapter->stats_reset &&
 483             ((jiffies/HZ - adapter->stats_reset) <
 484              data->seconds_since_last_reset))
 485                 zfcp_adjust_fc_host_stats(fc_stats, data,
 486                                           adapter->stats_reset_data);
 487         else
 488                 zfcp_set_fc_host_stats(fc_stats, data);
 489
 490         kfree(data);
 491         return fc_stats;
 492 }
 493
 494 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 495 {
 496         struct zfcp_adapter *adapter;
 497         struct fsf_qtcb_bottom_port *data;
 498         int ret;
 499
 500         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 501         data = kzalloc(sizeof(*data), GFP_KERNEL);
 502         if (!data)
 503                 return;
 504
 505         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 506         if (ret)
 507                 kfree(data);
 508         else {
 509                 adapter->stats_reset = jiffies/HZ;
 510                 kfree(adapter->stats_reset_data);
 511                 adapter->stats_reset_data = data; /* finally freed in
 512                                                      adapter_release */
 513         }
 514 }
 515
 516 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 517 {
 518         struct zfcp_adapter *adapter =
 519                 (struct zfcp_adapter *)shost->hostdata[0];
 520         int status = atomic_read(&adapter->status);
 521
 522         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 523             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 524                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 525         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 526                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 527         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 528                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 529         else
 530                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 531 }
 532
 533 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 534 {
 535         rport->dev_loss_tmo = timeout;
 536 }
 537
 538 /**
 539  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 540  * @rport: The FC rport where to teminate I/O
 541  *
 542  * Abort all pending SCSI commands for a port by closing the
 543  * port. Using a reopen avoids a conflict with a shutdown
 544  * overwriting a reopen. The "forced" ensures that a disappeared port
 545  * is not opened again as valid due to the cached plogi data in
 546  * non-NPIV mode.
 547  */
 548 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 549 {
 550         struct zfcp_port *port;
 551         struct Scsi_Host *shost = rport_to_shost(rport);
 552         struct zfcp_adapter *adapter =
 553                 (struct zfcp_adapter *)shost->hostdata[0];
 554
 555         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 556
 557         if (port) {
 558                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 559                 put_device(&port->dev);
 560         }
 561 }
 562
 563 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 564 {
 565         struct fc_rport_identifiers ids;
 566         struct fc_rport *rport;
 567
 568         if (port->rport)
 569                 return;
 570
 571         ids.node_name = port->wwnn;
 572         ids.port_name = port->wwpn;
 573         ids.port_id = port->d_id;
 574         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 575
 576         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 577         if (!rport) {
 578                 dev_err(&port->adapter->ccw_device->dev,
 579                         "Registering port 0x%016Lx failed\n",
 580                         (unsigned long long)port->wwpn);
 581                 return;
 582         }
 583
 584         rport->maxframe_size = port->maxframe_size;
 585         rport->supported_classes = port->supported_classes;
 586         port->rport = rport;
 587         port->starget_id = rport->scsi_target_id;
 588
 589         zfcp_unit_queue_scsi_scan(port);
 590 }
 591
 592 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 593 {
 594         struct fc_rport *rport = port->rport;
 595
 596         if (rport) {
 597                 fc_remote_port_delete(rport);
 598                 port->rport = NULL;
 599         }
 600 }
 601
 602 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 603 {
 604         get_device(&port->dev);
 605         port->rport_task = RPORT_ADD;
 606
 607         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 608                 put_device(&port->dev);
 609 }
 610
 611 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 612 {
 613         get_device(&port->dev);
 614         port->rport_task = RPORT_DEL;
 615
 616         if (port->rport && queue_work(port->adapter->work_queue,
 617                                       &port->rport_work))
 618                 return;
 619
 620         put_device(&port->dev);
 621 }
 622
 623 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 624 {
 625         unsigned long flags;
 626         struct zfcp_port *port;
 627
 628         read_lock_irqsave(&adapter->port_list_lock, flags);
 629         list_for_each_entry(port, &adapter->port_list, list)
 630                 zfcp_scsi_schedule_rport_block(port);
 631         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 632 }
 633
 634 void zfcp_scsi_rport_work(struct work_struct *work)
 635 {
 636         struct zfcp_port *port = container_of(work, struct zfcp_port,
 637                                               rport_work);
 638
 639         while (port->rport_task) {
 640                 if (port->rport_task == RPORT_ADD) {
 641                         port->rport_task = RPORT_NONE;
 642                         zfcp_scsi_rport_register(port);
 643                 } else {
 644                         port->rport_task = RPORT_NONE;
 645                         zfcp_scsi_rport_block(port);
 646                 }
 647         }
 648
 649         put_device(&port->dev);
 650 }
 651
 652 /**
 653  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 654  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 655  */
 656 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 657 {
 658         unsigned int mask = 0;
 659         unsigned int data_div;
 660         struct Scsi_Host *shost = adapter->scsi_host;
 661
 662         data_div = atomic_read(&adapter->status) &
 663                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 664
 665         if (enable_dif &&
 666             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 667                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 668
 669         if (enable_dif && data_div &&
 670             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 671                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 672                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 673                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 674                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 675                 shost->max_sectors = shost->sg_tablesize * 8;
 676         }
 677
 678         scsi_host_set_prot(shost, mask);
 679 }
 680
 681 /**
 682  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 683  * @scmd: The SCSI command to report the error for
 684  * @ascq: The ASCQ to put in the sense buffer
 685  *
 686  * See the error handling in sd_done for the sense codes used here.
 687  * Set DID_SOFT_ERROR to retry the request, if possible.
 688  */
 689 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 690 {
 691         scsi_build_sense_buffer(1, scmd->sense_buffer,
 692                                 ILLEGAL_REQUEST, 0x10, ascq);
 693         set_driver_byte(scmd, DRIVER_SENSE);
 694         scmd->result |= SAM_STAT_CHECK_CONDITION;
 695         set_host_byte(scmd, DID_SOFT_ERROR);
 696 }
 697
 698 struct fc_function_template zfcp_transport_functions = {
 699         .show_starget_port_id = 1,
 700         .show_starget_port_name = 1,
 701         .show_starget_node_name = 1,
 702         .show_rport_supported_classes = 1,
 703         .show_rport_maxframe_size = 1,
 704         .show_rport_dev_loss_tmo = 1,
 705         .show_host_node_name = 1,
 706         .show_host_port_name = 1,
 707         .show_host_permanent_port_name = 1,
 708         .show_host_supported_classes = 1,
 709         .show_host_supported_fc4s = 1,
 710         .show_host_supported_speeds = 1,
 711         .show_host_maxframe_size = 1,
 712         .show_host_serial_number = 1,
 713         .get_fc_host_stats = zfcp_get_fc_host_stats,
 714         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 715         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 716         .get_host_port_state = zfcp_get_host_port_state,
 717         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 718         .show_host_port_state = 1,
 719         .show_host_active_fc4s = 1,
 720         .bsg_request = zfcp_fc_exec_bsg_job,
 721         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 722         /* no functions registered for following dynamic attributes but
 723            directly set by LLDD */
 724         .show_host_port_type = 1,
 725         .show_host_symbolic_name = 1,
 726         .show_host_speed = 1,
 727         .show_host_port_id = 1,
 728         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 729 };