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