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