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         switch (reason) {
  39         case SCSI_QDEPTH_DEFAULT:
  40                 scsi_adjust_queue_depth(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, 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, default_depth);
  70         return 0;
  71 }
  72
  73 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  74 {
  75         set_host_byte(scpnt, result);
  76         zfcp_dbf_scsi_fail_send(scpnt);
  77         scpnt->scsi_done(scpnt);
  78 }
  79
  80 static
  81 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  82 {
  83         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  84         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  85         int    status, scsi_result, ret;
  86
  87         /* reset the status for this request */
  88         scpnt->result = 0;
  89         scpnt->host_scribble = NULL;
  90
  91         scsi_result = fc_remote_port_chkready(rport);
  92         if (unlikely(scsi_result)) {
  93                 scpnt->result = scsi_result;
  94                 zfcp_dbf_scsi_fail_send(scpnt);
  95                 scpnt->scsi_done(scpnt);
  96                 return 0;
  97         }
  98
  99         status = atomic_read(&zfcp_sdev->status);
 100         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 101                      !(atomic_read(&zfcp_sdev->port->status) &
 102                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 103                 /* only LUN access denied, but port is good
 104                  * not covered by FC transport, have to fail here */
 105                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 106                 return 0;
 107         }
 108
 109         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 110                 /* This could be either
 111                  * open LUN pending: this is temporary, will result in
 112                  *      open LUN or ERP_FAILED, so retry command
 113                  * call to rport_delete pending: mimic retry from
 114                  *      fc_remote_port_chkready until rport is BLOCKED
 115                  */
 116                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 117                 return 0;
 118         }
 119
 120         ret = zfcp_fsf_fcp_cmnd(scpnt);
 121         if (unlikely(ret == -EBUSY))
 122                 return SCSI_MLQUEUE_DEVICE_BUSY;
 123         else if (unlikely(ret < 0))
 124                 return SCSI_MLQUEUE_HOST_BUSY;
 125
 126         return ret;
 127 }
 128
 129 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 130 {
 131         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 132         struct zfcp_adapter *adapter =
 133                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 134         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 135         struct zfcp_port *port;
 136         struct zfcp_unit *unit;
 137         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 138
 139         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 140         if (!port)
 141                 return -ENXIO;
 142
 143         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 144         if (unit)
 145                 put_device(&unit->dev);
 146
 147         if (!unit && !(allow_lun_scan && npiv)) {
 148                 put_device(&port->dev);
 149                 return -ENXIO;
 150         }
 151
 152         zfcp_sdev->port = port;
 153         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 154         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 155         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 157         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 158         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 159         spin_lock_init(&zfcp_sdev->latencies.lock);
 160
 161         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 162         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 163         zfcp_erp_wait(port->adapter);
 164
 165         return 0;
 166 }
 167
 168 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 169 {
 170         struct Scsi_Host *scsi_host = scpnt->device->host;
 171         struct zfcp_adapter *adapter =
 172                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 173         struct zfcp_fsf_req *old_req, *abrt_req;
 174         unsigned long flags;
 175         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 176         int retval = SUCCESS, ret;
 177         int retry = 3;
 178         char *dbf_tag;
 179
 180         /* avoid race condition between late normal completion and abort */
 181         write_lock_irqsave(&adapter->abort_lock, flags);
 182
 183         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 184         if (!old_req) {
 185                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 186                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 187                 return FAILED; /* completion could be in progress */
 188         }
 189         old_req->data = NULL;
 190
 191         /* don't access old fsf_req after releasing the abort_lock */
 192         write_unlock_irqrestore(&adapter->abort_lock, flags);
 193
 194         while (retry--) {
 195                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 196                 if (abrt_req)
 197                         break;
 198
 199                 zfcp_erp_wait(adapter);
 200                 ret = fc_block_scsi_eh(scpnt);
 201                 if (ret) {
 202                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 203                         return ret;
 204                 }
 205                 if (!(atomic_read(&adapter->status) &
 206                       ZFCP_STATUS_COMMON_RUNNING)) {
 207                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 208                         return SUCCESS;
 209                 }
 210         }
 211         if (!abrt_req) {
 212                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 213                 return FAILED;
 214         }
 215
 216         wait_for_completion(&abrt_req->completion);
 217
 218         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 219                 dbf_tag = "abrt_ok";
 220         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 221                 dbf_tag = "abrt_nn";
 222         else {
 223                 dbf_tag = "abrt_fa";
 224                 retval = FAILED;
 225         }
 226         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 227         zfcp_fsf_req_free(abrt_req);
 228         return retval;
 229 }
 230
 231 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 232 {
 233         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 234         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 235         struct zfcp_fsf_req *fsf_req = NULL;
 236         int retval = SUCCESS, ret;
 237         int retry = 3;
 238
 239         while (retry--) {
 240                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 241                 if (fsf_req)
 242                         break;
 243
 244                 zfcp_erp_wait(adapter);
 245                 ret = fc_block_scsi_eh(scpnt);
 246                 if (ret)
 247                         return ret;
 248
 249                 if (!(atomic_read(&adapter->status) &
 250                       ZFCP_STATUS_COMMON_RUNNING)) {
 251                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 252                         return SUCCESS;
 253                 }
 254         }
 255         if (!fsf_req)
 256                 return FAILED;
 257
 258         wait_for_completion(&fsf_req->completion);
 259
 260         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 261                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 262                 retval = FAILED;
 263         } else
 264                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 265
 266         zfcp_fsf_req_free(fsf_req);
 267         return retval;
 268 }
 269
 270 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 271 {
 272         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 273 }
 274
 275 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 276 {
 277         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 278 }
 279
 280 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 281 {
 282         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 283         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 284         int ret;
 285
 286         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 287         zfcp_erp_wait(adapter);
 288         ret = fc_block_scsi_eh(scpnt);
 289         if (ret)
 290                 return ret;
 291
 292         return SUCCESS;
 293 }
 294
 295 struct scsi_transport_template *zfcp_scsi_transport_template;
 296
 297 static struct scsi_host_template zfcp_scsi_host_template = {
 298         .module                  = THIS_MODULE,
 299         .name                    = "zfcp",
 300         .queuecommand            = zfcp_scsi_queuecommand,
 301         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 302         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 303         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 304         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 305         .slave_alloc             = zfcp_scsi_slave_alloc,
 306         .slave_configure         = zfcp_scsi_slave_configure,
 307         .slave_destroy           = zfcp_scsi_slave_destroy,
 308         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 309         .proc_name               = "zfcp",
 310         .can_queue               = 4096,
 311         .this_id                 = -1,
 312         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 313                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 314                                    /* GCD, adjusted later */
 315         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 316                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 317                                    /* GCD, adjusted later */
 318         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 319         .cmd_per_lun             = 1,
 320         .use_clustering          = 1,
 321         .shost_attrs             = zfcp_sysfs_shost_attrs,
 322         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 323 };
 324
 325 /**
 326  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 327  * @adapter: The zfcp adapter to register with the SCSI midlayer
 328  */
 329 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 330 {
 331         struct ccw_dev_id dev_id;
 332
 333         if (adapter->scsi_host)
 334                 return 0;
 335
 336         ccw_device_get_id(adapter->ccw_device, &dev_id);
 337         /* register adapter as SCSI host with mid layer of SCSI stack */
 338         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 339                                              sizeof (struct zfcp_adapter *));
 340         if (!adapter->scsi_host) {
 341                 dev_err(&adapter->ccw_device->dev,
 342                         "Registering the FCP device with the "
 343                         "SCSI stack failed\n");
 344                 return -EIO;
 345         }
 346
 347         /* tell the SCSI stack some characteristics of this adapter */
 348         adapter->scsi_host->max_id = 511;
 349         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 350         adapter->scsi_host->max_channel = 0;
 351         adapter->scsi_host->unique_id = dev_id.devno;
 352         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 353         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 354
 355         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 356
 357         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 358                 scsi_host_put(adapter->scsi_host);
 359                 return -EIO;
 360         }
 361
 362         return 0;
 363 }
 364
 365 /**
 366  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 367  * @adapter: The zfcp adapter to unregister.
 368  */
 369 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 370 {
 371         struct Scsi_Host *shost;
 372         struct zfcp_port *port;
 373
 374         shost = adapter->scsi_host;
 375         if (!shost)
 376                 return;
 377
 378         read_lock_irq(&adapter->port_list_lock);
 379         list_for_each_entry(port, &adapter->port_list, list)
 380                 port->rport = NULL;
 381         read_unlock_irq(&adapter->port_list_lock);
 382
 383         fc_remove_host(shost);
 384         scsi_remove_host(shost);
 385         scsi_host_put(shost);
 386         adapter->scsi_host = NULL;
 387 }
 388
 389 static struct fc_host_statistics*
 390 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 391 {
 392         struct fc_host_statistics *fc_stats;
 393
 394         if (!adapter->fc_stats) {
 395                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 396                 if (!fc_stats)
 397                         return NULL;
 398                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 399         }
 400         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 401         return adapter->fc_stats;
 402 }
 403
 404 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 405                                       struct fsf_qtcb_bottom_port *data,
 406                                       struct fsf_qtcb_bottom_port *old)
 407 {
 408         fc_stats->seconds_since_last_reset =
 409                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 410         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 411         fc_stats->tx_words = data->tx_words - old->tx_words;
 412         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 413         fc_stats->rx_words = data->rx_words - old->rx_words;
 414         fc_stats->lip_count = data->lip - old->lip;
 415         fc_stats->nos_count = data->nos - old->nos;
 416         fc_stats->error_frames = data->error_frames - old->error_frames;
 417         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 418         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 419         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 420         fc_stats->loss_of_signal_count =
 421                 data->loss_of_signal - old->loss_of_signal;
 422         fc_stats->prim_seq_protocol_err_count =
 423                 data->psp_error_counts - old->psp_error_counts;
 424         fc_stats->invalid_tx_word_count =
 425                 data->invalid_tx_words - old->invalid_tx_words;
 426         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 427         fc_stats->fcp_input_requests =
 428                 data->input_requests - old->input_requests;
 429         fc_stats->fcp_output_requests =
 430                 data->output_requests - old->output_requests;
 431         fc_stats->fcp_control_requests =
 432                 data->control_requests - old->control_requests;
 433         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 434         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 435 }
 436
 437 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 438                                    struct fsf_qtcb_bottom_port *data)
 439 {
 440         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 441         fc_stats->tx_frames = data->tx_frames;
 442         fc_stats->tx_words = data->tx_words;
 443         fc_stats->rx_frames = data->rx_frames;
 444         fc_stats->rx_words = data->rx_words;
 445         fc_stats->lip_count = data->lip;
 446         fc_stats->nos_count = data->nos;
 447         fc_stats->error_frames = data->error_frames;
 448         fc_stats->dumped_frames = data->dumped_frames;
 449         fc_stats->link_failure_count = data->link_failure;
 450         fc_stats->loss_of_sync_count = data->loss_of_sync;
 451         fc_stats->loss_of_signal_count = data->loss_of_signal;
 452         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 453         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 454         fc_stats->invalid_crc_count = data->invalid_crcs;
 455         fc_stats->fcp_input_requests = data->input_requests;
 456         fc_stats->fcp_output_requests = data->output_requests;
 457         fc_stats->fcp_control_requests = data->control_requests;
 458         fc_stats->fcp_input_megabytes = data->input_mb;
 459         fc_stats->fcp_output_megabytes = data->output_mb;
 460 }
 461
 462 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 463 {
 464         struct zfcp_adapter *adapter;
 465         struct fc_host_statistics *fc_stats;
 466         struct fsf_qtcb_bottom_port *data;
 467         int ret;
 468
 469         adapter = (struct zfcp_adapter *)host->hostdata[0];
 470         fc_stats = zfcp_init_fc_host_stats(adapter);
 471         if (!fc_stats)
 472                 return NULL;
 473
 474         data = kzalloc(sizeof(*data), GFP_KERNEL);
 475         if (!data)
 476                 return NULL;
 477
 478         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 479         if (ret) {
 480                 kfree(data);
 481                 return NULL;
 482         }
 483
 484         if (adapter->stats_reset &&
 485             ((jiffies/HZ - adapter->stats_reset) <
 486              data->seconds_since_last_reset))
 487                 zfcp_adjust_fc_host_stats(fc_stats, data,
 488                                           adapter->stats_reset_data);
 489         else
 490                 zfcp_set_fc_host_stats(fc_stats, data);
 491
 492         kfree(data);
 493         return fc_stats;
 494 }
 495
 496 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 497 {
 498         struct zfcp_adapter *adapter;
 499         struct fsf_qtcb_bottom_port *data;
 500         int ret;
 501
 502         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 503         data = kzalloc(sizeof(*data), GFP_KERNEL);
 504         if (!data)
 505                 return;
 506
 507         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 508         if (ret)
 509                 kfree(data);
 510         else {
 511                 adapter->stats_reset = jiffies/HZ;
 512                 kfree(adapter->stats_reset_data);
 513                 adapter->stats_reset_data = data; /* finally freed in
 514                                                      adapter_release */
 515         }
 516 }
 517
 518 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 519 {
 520         struct zfcp_adapter *adapter =
 521                 (struct zfcp_adapter *)shost->hostdata[0];
 522         int status = atomic_read(&adapter->status);
 523
 524         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 525             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 526                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 527         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 528                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 529         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 530                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 531         else
 532                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 533 }
 534
 535 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 536 {
 537         rport->dev_loss_tmo = timeout;
 538 }
 539
 540 /**
 541  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 542  * @rport: The FC rport where to teminate I/O
 543  *
 544  * Abort all pending SCSI commands for a port by closing the
 545  * port. Using a reopen avoids a conflict with a shutdown
 546  * overwriting a reopen. The "forced" ensures that a disappeared port
 547  * is not opened again as valid due to the cached plogi data in
 548  * non-NPIV mode.
 549  */
 550 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 551 {
 552         struct zfcp_port *port;
 553         struct Scsi_Host *shost = rport_to_shost(rport);
 554         struct zfcp_adapter *adapter =
 555                 (struct zfcp_adapter *)shost->hostdata[0];
 556
 557         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 558
 559         if (port) {
 560                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 561                 put_device(&port->dev);
 562         }
 563 }
 564
 565 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 566 {
 567         struct fc_rport_identifiers ids;
 568         struct fc_rport *rport;
 569
 570         if (port->rport)
 571                 return;
 572
 573         ids.node_name = port->wwnn;
 574         ids.port_name = port->wwpn;
 575         ids.port_id = port->d_id;
 576         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 577
 578         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 579         if (!rport) {
 580                 dev_err(&port->adapter->ccw_device->dev,
 581                         "Registering port 0x%016Lx failed\n",
 582                         (unsigned long long)port->wwpn);
 583                 return;
 584         }
 585
 586         rport->maxframe_size = port->maxframe_size;
 587         rport->supported_classes = port->supported_classes;
 588         port->rport = rport;
 589         port->starget_id = rport->scsi_target_id;
 590
 591         zfcp_unit_queue_scsi_scan(port);
 592 }
 593
 594 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 595 {
 596         struct fc_rport *rport = port->rport;
 597
 598         if (rport) {
 599                 fc_remote_port_delete(rport);
 600                 port->rport = NULL;
 601         }
 602 }
 603
 604 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 605 {
 606         get_device(&port->dev);
 607         port->rport_task = RPORT_ADD;
 608
 609         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 610                 put_device(&port->dev);
 611 }
 612
 613 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 614 {
 615         get_device(&port->dev);
 616         port->rport_task = RPORT_DEL;
 617
 618         if (port->rport && queue_work(port->adapter->work_queue,
 619                                       &port->rport_work))
 620                 return;
 621
 622         put_device(&port->dev);
 623 }
 624
 625 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 626 {
 627         unsigned long flags;
 628         struct zfcp_port *port;
 629
 630         read_lock_irqsave(&adapter->port_list_lock, flags);
 631         list_for_each_entry(port, &adapter->port_list, list)
 632                 zfcp_scsi_schedule_rport_block(port);
 633         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 634 }
 635
 636 void zfcp_scsi_rport_work(struct work_struct *work)
 637 {
 638         struct zfcp_port *port = container_of(work, struct zfcp_port,
 639                                               rport_work);
 640
 641         while (port->rport_task) {
 642                 if (port->rport_task == RPORT_ADD) {
 643                         port->rport_task = RPORT_NONE;
 644                         zfcp_scsi_rport_register(port);
 645                 } else {
 646                         port->rport_task = RPORT_NONE;
 647                         zfcp_scsi_rport_block(port);
 648                 }
 649         }
 650
 651         put_device(&port->dev);
 652 }
 653
 654 /**
 655  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 656  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 657  */
 658 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 659 {
 660         unsigned int mask = 0;
 661         unsigned int data_div;
 662         struct Scsi_Host *shost = adapter->scsi_host;
 663
 664         data_div = atomic_read(&adapter->status) &
 665                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 666
 667         if (enable_dif &&
 668             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 669                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 670
 671         if (enable_dif && data_div &&
 672             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 673                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 674                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 675                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 676                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 677                 shost->max_sectors = shost->sg_tablesize * 8;
 678         }
 679
 680         scsi_host_set_prot(shost, mask);
 681 }
 682
 683 /**
 684  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 685  * @scmd: The SCSI command to report the error for
 686  * @ascq: The ASCQ to put in the sense buffer
 687  *
 688  * See the error handling in sd_done for the sense codes used here.
 689  * Set DID_SOFT_ERROR to retry the request, if possible.
 690  */
 691 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 692 {
 693         scsi_build_sense_buffer(1, scmd->sense_buffer,
 694                                 ILLEGAL_REQUEST, 0x10, ascq);
 695         set_driver_byte(scmd, DRIVER_SENSE);
 696         scmd->result |= SAM_STAT_CHECK_CONDITION;
 697         set_host_byte(scmd, DID_SOFT_ERROR);
 698 }
 699
 700 struct fc_function_template zfcp_transport_functions = {
 701         .show_starget_port_id = 1,
 702         .show_starget_port_name = 1,
 703         .show_starget_node_name = 1,
 704         .show_rport_supported_classes = 1,
 705         .show_rport_maxframe_size = 1,
 706         .show_rport_dev_loss_tmo = 1,
 707         .show_host_node_name = 1,
 708         .show_host_port_name = 1,
 709         .show_host_permanent_port_name = 1,
 710         .show_host_supported_classes = 1,
 711         .show_host_supported_fc4s = 1,
 712         .show_host_supported_speeds = 1,
 713         .show_host_maxframe_size = 1,
 714         .show_host_serial_number = 1,
 715         .get_fc_host_stats = zfcp_get_fc_host_stats,
 716         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 717         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 718         .get_host_port_state = zfcp_get_host_port_state,
 719         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 720         .show_host_port_state = 1,
 721         .show_host_active_fc4s = 1,
 722         .bsg_request = zfcp_fc_exec_bsg_job,
 723         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 724         /* no functions registered for following dynamic attributes but
 725            directly set by LLDD */
 726         .show_host_port_type = 1,
 727         .show_host_symbolic_name = 1,
 728         .show_host_speed = 1,
 729         .show_host_port_id = 1,
 730         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 731 };