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
  29 #ifdef CONFIG_ZFCP_DIF
  30 module_param_named(dif, enable_dif, bool, 0600);
  31 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  32 #endif
  33
  34 static bool allow_lun_scan = 1;
  35 module_param(allow_lun_scan, bool, 0600);
  36 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  37
  38 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  39                                         int reason)
  40 {
  41         switch (reason) {
  42         case SCSI_QDEPTH_DEFAULT:
  43                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  44                 break;
  45         case SCSI_QDEPTH_QFULL:
  46                 scsi_track_queue_full(sdev, depth);
  47                 break;
  48         case SCSI_QDEPTH_RAMP_UP:
  49                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  50                 break;
  51         default:
  52                 return -EOPNOTSUPP;
  53         }
  54         return sdev->queue_depth;
  55 }
  56
  57 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  58 {
  59         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  60
  61         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  62         put_device(&zfcp_sdev->port->dev);
  63 }
  64
  65 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  66 {
  67         if (sdp->tagged_supported)
  68                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  69         else
  70                 scsi_adjust_queue_depth(sdp, 0, 1);
  71         return 0;
  72 }
  73
  74 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  75 {
  76         set_host_byte(scpnt, result);
  77         zfcp_dbf_scsi_fail_send(scpnt);
  78         scpnt->scsi_done(scpnt);
  79 }
  80
  81 static
  82 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  83 {
  84         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  85         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  86         int    status, scsi_result, ret;
  87
  88         /* reset the status for this request */
  89         scpnt->result = 0;
  90         scpnt->host_scribble = NULL;
  91
  92         scsi_result = fc_remote_port_chkready(rport);
  93         if (unlikely(scsi_result)) {
  94                 scpnt->result = scsi_result;
  95                 zfcp_dbf_scsi_fail_send(scpnt);
  96                 scpnt->scsi_done(scpnt);
  97                 return 0;
  98         }
  99
 100         status = atomic_read(&zfcp_sdev->status);
 101         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 102                      !(atomic_read(&zfcp_sdev->port->status) &
 103                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 104                 /* only LUN access denied, but port is good
 105                  * not covered by FC transport, have to fail here */
 106                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 107                 return 0;
 108         }
 109
 110         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 111                 /* This could be either
 112                  * open LUN pending: this is temporary, will result in
 113                  *      open LUN or ERP_FAILED, so retry command
 114                  * call to rport_delete pending: mimic retry from
 115                  *      fc_remote_port_chkready until rport is BLOCKED
 116                  */
 117                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 118                 return 0;
 119         }
 120
 121         ret = zfcp_fsf_fcp_cmnd(scpnt);
 122         if (unlikely(ret == -EBUSY))
 123                 return SCSI_MLQUEUE_DEVICE_BUSY;
 124         else if (unlikely(ret < 0))
 125                 return SCSI_MLQUEUE_HOST_BUSY;
 126
 127         return ret;
 128 }
 129
 130 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 131 {
 132         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 133         struct zfcp_adapter *adapter =
 134                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 135         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 136         struct zfcp_port *port;
 137         struct zfcp_unit *unit;
 138         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 139
 140         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 141         if (!port)
 142                 return -ENXIO;
 143
 144         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 145         if (unit)
 146                 put_device(&unit->dev);
 147
 148         if (!unit && !(allow_lun_scan && npiv)) {
 149                 put_device(&port->dev);
 150                 return -ENXIO;
 151         }
 152
 153         zfcp_sdev->port = port;
 154         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 155         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 157         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 158         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 159         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 160         spin_lock_init(&zfcp_sdev->latencies.lock);
 161
 162         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 163         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 164         zfcp_erp_wait(port->adapter);
 165
 166         return 0;
 167 }
 168
 169 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 170 {
 171         struct Scsi_Host *scsi_host = scpnt->device->host;
 172         struct zfcp_adapter *adapter =
 173                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 174         struct zfcp_fsf_req *old_req, *abrt_req;
 175         unsigned long flags;
 176         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 177         int retval = SUCCESS, ret;
 178         int retry = 3;
 179         char *dbf_tag;
 180
 181         /* avoid race condition between late normal completion and abort */
 182         write_lock_irqsave(&adapter->abort_lock, flags);
 183
 184         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 185         if (!old_req) {
 186                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 187                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 188                 return FAILED; /* completion could be in progress */
 189         }
 190         old_req->data = NULL;
 191
 192         /* don't access old fsf_req after releasing the abort_lock */
 193         write_unlock_irqrestore(&adapter->abort_lock, flags);
 194
 195         while (retry--) {
 196                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 197                 if (abrt_req)
 198                         break;
 199
 200                 zfcp_erp_wait(adapter);
 201                 ret = fc_block_scsi_eh(scpnt);
 202                 if (ret) {
 203                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 204                         return ret;
 205                 }
 206                 if (!(atomic_read(&adapter->status) &
 207                       ZFCP_STATUS_COMMON_RUNNING)) {
 208                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 209                         return SUCCESS;
 210                 }
 211         }
 212         if (!abrt_req) {
 213                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 214                 return FAILED;
 215         }
 216
 217         wait_for_completion(&abrt_req->completion);
 218
 219         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 220                 dbf_tag = "abrt_ok";
 221         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 222                 dbf_tag = "abrt_nn";
 223         else {
 224                 dbf_tag = "abrt_fa";
 225                 retval = FAILED;
 226         }
 227         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 228         zfcp_fsf_req_free(abrt_req);
 229         return retval;
 230 }
 231
 232 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 233 {
 234         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 235         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 236         struct zfcp_fsf_req *fsf_req = NULL;
 237         int retval = SUCCESS, ret;
 238         int retry = 3;
 239
 240         while (retry--) {
 241                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 242                 if (fsf_req)
 243                         break;
 244
 245                 zfcp_erp_wait(adapter);
 246                 ret = fc_block_scsi_eh(scpnt);
 247                 if (ret)
 248                         return ret;
 249
 250                 if (!(atomic_read(&adapter->status) &
 251                       ZFCP_STATUS_COMMON_RUNNING)) {
 252                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 253                         return SUCCESS;
 254                 }
 255         }
 256         if (!fsf_req)
 257                 return FAILED;
 258
 259         wait_for_completion(&fsf_req->completion);
 260
 261         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 262                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 263                 retval = FAILED;
 264         } else
 265                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 266
 267         zfcp_fsf_req_free(fsf_req);
 268         return retval;
 269 }
 270
 271 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 272 {
 273         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 274 }
 275
 276 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 277 {
 278         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 279 }
 280
 281 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 282 {
 283         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 284         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 285         int ret;
 286
 287         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 288         zfcp_erp_wait(adapter);
 289         ret = fc_block_scsi_eh(scpnt);
 290         if (ret)
 291                 return ret;
 292
 293         return SUCCESS;
 294 }
 295
 296 struct scsi_transport_template *zfcp_scsi_transport_template;
 297
 298 static struct scsi_host_template zfcp_scsi_host_template = {
 299         .module                  = THIS_MODULE,
 300         .name                    = "zfcp",
 301         .queuecommand            = zfcp_scsi_queuecommand,
 302         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 303         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 304         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 305         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 306         .slave_alloc             = zfcp_scsi_slave_alloc,
 307         .slave_configure         = zfcp_scsi_slave_configure,
 308         .slave_destroy           = zfcp_scsi_slave_destroy,
 309         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 310         .proc_name               = "zfcp",
 311         .can_queue               = 4096,
 312         .this_id                 = -1,
 313         .sg_tablesize            = ZFCP_QDIO_MAX_SBALES_PER_REQ,
 314         .max_sectors             = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8),
 315         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 316         .cmd_per_lun             = 1,
 317         .use_clustering          = 1,
 318         .shost_attrs             = zfcp_sysfs_shost_attrs,
 319         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 320 };
 321
 322 /**
 323  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 324  * @adapter: The zfcp adapter to register with the SCSI midlayer
 325  */
 326 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 327 {
 328         struct ccw_dev_id dev_id;
 329
 330         if (adapter->scsi_host)
 331                 return 0;
 332
 333         ccw_device_get_id(adapter->ccw_device, &dev_id);
 334         /* register adapter as SCSI host with mid layer of SCSI stack */
 335         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 336                                              sizeof (struct zfcp_adapter *));
 337         if (!adapter->scsi_host) {
 338                 dev_err(&adapter->ccw_device->dev,
 339                         "Registering the FCP device with the "
 340                         "SCSI stack failed\n");
 341                 return -EIO;
 342         }
 343
 344         /* tell the SCSI stack some characteristics of this adapter */
 345         adapter->scsi_host->max_id = 511;
 346         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 347         adapter->scsi_host->max_channel = 0;
 348         adapter->scsi_host->unique_id = dev_id.devno;
 349         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 350         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 351
 352         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 353
 354         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 355                 scsi_host_put(adapter->scsi_host);
 356                 return -EIO;
 357         }
 358
 359         return 0;
 360 }
 361
 362 /**
 363  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 364  * @adapter: The zfcp adapter to unregister.
 365  */
 366 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 367 {
 368         struct Scsi_Host *shost;
 369         struct zfcp_port *port;
 370
 371         shost = adapter->scsi_host;
 372         if (!shost)
 373                 return;
 374
 375         read_lock_irq(&adapter->port_list_lock);
 376         list_for_each_entry(port, &adapter->port_list, list)
 377                 port->rport = NULL;
 378         read_unlock_irq(&adapter->port_list_lock);
 379
 380         fc_remove_host(shost);
 381         scsi_remove_host(shost);
 382         scsi_host_put(shost);
 383         adapter->scsi_host = NULL;
 384 }
 385
 386 static struct fc_host_statistics*
 387 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 388 {
 389         struct fc_host_statistics *fc_stats;
 390
 391         if (!adapter->fc_stats) {
 392                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 393                 if (!fc_stats)
 394                         return NULL;
 395                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 396         }
 397         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 398         return adapter->fc_stats;
 399 }
 400
 401 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 402                                       struct fsf_qtcb_bottom_port *data,
 403                                       struct fsf_qtcb_bottom_port *old)
 404 {
 405         fc_stats->seconds_since_last_reset =
 406                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 407         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 408         fc_stats->tx_words = data->tx_words - old->tx_words;
 409         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 410         fc_stats->rx_words = data->rx_words - old->rx_words;
 411         fc_stats->lip_count = data->lip - old->lip;
 412         fc_stats->nos_count = data->nos - old->nos;
 413         fc_stats->error_frames = data->error_frames - old->error_frames;
 414         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 415         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 416         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 417         fc_stats->loss_of_signal_count =
 418                 data->loss_of_signal - old->loss_of_signal;
 419         fc_stats->prim_seq_protocol_err_count =
 420                 data->psp_error_counts - old->psp_error_counts;
 421         fc_stats->invalid_tx_word_count =
 422                 data->invalid_tx_words - old->invalid_tx_words;
 423         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 424         fc_stats->fcp_input_requests =
 425                 data->input_requests - old->input_requests;
 426         fc_stats->fcp_output_requests =
 427                 data->output_requests - old->output_requests;
 428         fc_stats->fcp_control_requests =
 429                 data->control_requests - old->control_requests;
 430         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 431         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 432 }
 433
 434 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 435                                    struct fsf_qtcb_bottom_port *data)
 436 {
 437         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 438         fc_stats->tx_frames = data->tx_frames;
 439         fc_stats->tx_words = data->tx_words;
 440         fc_stats->rx_frames = data->rx_frames;
 441         fc_stats->rx_words = data->rx_words;
 442         fc_stats->lip_count = data->lip;
 443         fc_stats->nos_count = data->nos;
 444         fc_stats->error_frames = data->error_frames;
 445         fc_stats->dumped_frames = data->dumped_frames;
 446         fc_stats->link_failure_count = data->link_failure;
 447         fc_stats->loss_of_sync_count = data->loss_of_sync;
 448         fc_stats->loss_of_signal_count = data->loss_of_signal;
 449         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 450         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 451         fc_stats->invalid_crc_count = data->invalid_crcs;
 452         fc_stats->fcp_input_requests = data->input_requests;
 453         fc_stats->fcp_output_requests = data->output_requests;
 454         fc_stats->fcp_control_requests = data->control_requests;
 455         fc_stats->fcp_input_megabytes = data->input_mb;
 456         fc_stats->fcp_output_megabytes = data->output_mb;
 457 }
 458
 459 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 460 {
 461         struct zfcp_adapter *adapter;
 462         struct fc_host_statistics *fc_stats;
 463         struct fsf_qtcb_bottom_port *data;
 464         int ret;
 465
 466         adapter = (struct zfcp_adapter *)host->hostdata[0];
 467         fc_stats = zfcp_init_fc_host_stats(adapter);
 468         if (!fc_stats)
 469                 return NULL;
 470
 471         data = kzalloc(sizeof(*data), GFP_KERNEL);
 472         if (!data)
 473                 return NULL;
 474
 475         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 476         if (ret) {
 477                 kfree(data);
 478                 return NULL;
 479         }
 480
 481         if (adapter->stats_reset &&
 482             ((jiffies/HZ - adapter->stats_reset) <
 483              data->seconds_since_last_reset))
 484                 zfcp_adjust_fc_host_stats(fc_stats, data,
 485                                           adapter->stats_reset_data);
 486         else
 487                 zfcp_set_fc_host_stats(fc_stats, data);
 488
 489         kfree(data);
 490         return fc_stats;
 491 }
 492
 493 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 494 {
 495         struct zfcp_adapter *adapter;
 496         struct fsf_qtcb_bottom_port *data;
 497         int ret;
 498
 499         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 500         data = kzalloc(sizeof(*data), GFP_KERNEL);
 501         if (!data)
 502                 return;
 503
 504         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 505         if (ret)
 506                 kfree(data);
 507         else {
 508                 adapter->stats_reset = jiffies/HZ;
 509                 kfree(adapter->stats_reset_data);
 510                 adapter->stats_reset_data = data; /* finally freed in
 511                                                      adapter_release */
 512         }
 513 }
 514
 515 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 516 {
 517         struct zfcp_adapter *adapter =
 518                 (struct zfcp_adapter *)shost->hostdata[0];
 519         int status = atomic_read(&adapter->status);
 520
 521         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 522             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 523                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 524         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 525                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 526         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 527                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 528         else
 529                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 530 }
 531
 532 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 533 {
 534         rport->dev_loss_tmo = timeout;
 535 }
 536
 537 /**
 538  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 539  * @rport: The FC rport where to teminate I/O
 540  *
 541  * Abort all pending SCSI commands for a port by closing the
 542  * port. Using a reopen avoids a conflict with a shutdown
 543  * overwriting a reopen. The "forced" ensures that a disappeared port
 544  * is not opened again as valid due to the cached plogi data in
 545  * non-NPIV mode.
 546  */
 547 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 548 {
 549         struct zfcp_port *port;
 550         struct Scsi_Host *shost = rport_to_shost(rport);
 551         struct zfcp_adapter *adapter =
 552                 (struct zfcp_adapter *)shost->hostdata[0];
 553
 554         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 555
 556         if (port) {
 557                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 558                 put_device(&port->dev);
 559         }
 560 }
 561
 562 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 563 {
 564         struct fc_rport_identifiers ids;
 565         struct fc_rport *rport;
 566
 567         if (port->rport)
 568                 return;
 569
 570         ids.node_name = port->wwnn;
 571         ids.port_name = port->wwpn;
 572         ids.port_id = port->d_id;
 573         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 574
 575         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 576         if (!rport) {
 577                 dev_err(&port->adapter->ccw_device->dev,
 578                         "Registering port 0x%016Lx failed\n",
 579                         (unsigned long long)port->wwpn);
 580                 return;
 581         }
 582
 583         rport->maxframe_size = port->maxframe_size;
 584         rport->supported_classes = port->supported_classes;
 585         port->rport = rport;
 586         port->starget_id = rport->scsi_target_id;
 587
 588         zfcp_unit_queue_scsi_scan(port);
 589 }
 590
 591 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 592 {
 593         struct fc_rport *rport = port->rport;
 594
 595         if (rport) {
 596                 fc_remote_port_delete(rport);
 597                 port->rport = NULL;
 598         }
 599 }
 600
 601 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 602 {
 603         get_device(&port->dev);
 604         port->rport_task = RPORT_ADD;
 605
 606         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 607                 put_device(&port->dev);
 608 }
 609
 610 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 611 {
 612         get_device(&port->dev);
 613         port->rport_task = RPORT_DEL;
 614
 615         if (port->rport && queue_work(port->adapter->work_queue,
 616                                       &port->rport_work))
 617                 return;
 618
 619         put_device(&port->dev);
 620 }
 621
 622 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 623 {
 624         unsigned long flags;
 625         struct zfcp_port *port;
 626
 627         read_lock_irqsave(&adapter->port_list_lock, flags);
 628         list_for_each_entry(port, &adapter->port_list, list)
 629                 zfcp_scsi_schedule_rport_block(port);
 630         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 631 }
 632
 633 void zfcp_scsi_rport_work(struct work_struct *work)
 634 {
 635         struct zfcp_port *port = container_of(work, struct zfcp_port,
 636                                               rport_work);
 637
 638         while (port->rport_task) {
 639                 if (port->rport_task == RPORT_ADD) {
 640                         port->rport_task = RPORT_NONE;
 641                         zfcp_scsi_rport_register(port);
 642                 } else {
 643                         port->rport_task = RPORT_NONE;
 644                         zfcp_scsi_rport_block(port);
 645                 }
 646         }
 647
 648         put_device(&port->dev);
 649 }
 650
 651 /**
 652  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 653  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 654  */
 655 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 656 {
 657         unsigned int mask = 0;
 658         unsigned int data_div;
 659         struct Scsi_Host *shost = adapter->scsi_host;
 660
 661         data_div = atomic_read(&adapter->status) &
 662                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 663
 664         if (enable_dif &&
 665             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 666                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 667
 668         if (enable_dif && data_div &&
 669             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 670                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 671                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 672                 shost->sg_prot_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
 673                 shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
 674                 shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2;
 675         }
 676
 677         scsi_host_set_prot(shost, mask);
 678 }
 679
 680 /**
 681  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 682  * @scmd: The SCSI command to report the error for
 683  * @ascq: The ASCQ to put in the sense buffer
 684  *
 685  * See the error handling in sd_done for the sense codes used here.
 686  * Set DID_SOFT_ERROR to retry the request, if possible.
 687  */
 688 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 689 {
 690         scsi_build_sense_buffer(1, scmd->sense_buffer,
 691                                 ILLEGAL_REQUEST, 0x10, ascq);
 692         set_driver_byte(scmd, DRIVER_SENSE);
 693         scmd->result |= SAM_STAT_CHECK_CONDITION;
 694         set_host_byte(scmd, DID_SOFT_ERROR);
 695 }
 696
 697 struct fc_function_template zfcp_transport_functions = {
 698         .show_starget_port_id = 1,
 699         .show_starget_port_name = 1,
 700         .show_starget_node_name = 1,
 701         .show_rport_supported_classes = 1,
 702         .show_rport_maxframe_size = 1,
 703         .show_rport_dev_loss_tmo = 1,
 704         .show_host_node_name = 1,
 705         .show_host_port_name = 1,
 706         .show_host_permanent_port_name = 1,
 707         .show_host_supported_classes = 1,
 708         .show_host_supported_fc4s = 1,
 709         .show_host_supported_speeds = 1,
 710         .show_host_maxframe_size = 1,
 711         .show_host_serial_number = 1,
 712         .get_fc_host_stats = zfcp_get_fc_host_stats,
 713         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 714         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 715         .get_host_port_state = zfcp_get_host_port_state,
 716         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 717         .show_host_port_state = 1,
 718         .show_host_active_fc4s = 1,
 719         .bsg_request = zfcp_fc_exec_bsg_job,
 720         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 721         /* no functions registered for following dynamic attributes but
 722            directly set by LLDD */
 723         .show_host_port_type = 1,
 724         .show_host_symbolic_name = 1,
 725         .show_host_speed = 1,
 726         .show_host_port_id = 1,
 727         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 728 };