drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corp. 2002, 2017
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/slab.h>
  15 #include <scsi/fc/fc_fcp.h>
  16 #include <scsi/scsi_eh.h>
  17 #include <linux/atomic.h>
  18 #include "zfcp_ext.h"
  19 #include "zfcp_dbf.h"
  20 #include "zfcp_fc.h"
  21 #include "zfcp_reqlist.h"
  22
  23 static unsigned int default_depth = 32;
  24 module_param_named(queue_depth, default_depth, uint, 0600);
  25 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  26
  27 static bool enable_dif;
  28 module_param_named(dif, enable_dif, bool, 0400);
  29 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  30
  31 static bool allow_lun_scan = 1;
  32 module_param(allow_lun_scan, bool, 0600);
  33 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  34
  35 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  36                                         int reason)
  37 {
  38         switch (reason) {
  39         case SCSI_QDEPTH_DEFAULT:
  40                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  41                 break;
  42         case SCSI_QDEPTH_QFULL:
  43                 scsi_track_queue_full(sdev, depth);
  44                 break;
  45         case SCSI_QDEPTH_RAMP_UP:
  46                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  47                 break;
  48         default:
  49                 return -EOPNOTSUPP;
  50         }
  51         return sdev->queue_depth;
  52 }
  53
  54 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  55 {
  56         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  57
  58         /* if previous slave_alloc returned early, there is nothing to do */
  59         if (!zfcp_sdev->port)
  60                 return;
  61
  62         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  63         put_device(&zfcp_sdev->port->dev);
  64 }
  65
  66 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  67 {
  68         if (sdp->tagged_supported)
  69                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  70         else
  71                 scsi_adjust_queue_depth(sdp, 0, 1);
  72         return 0;
  73 }
  74
  75 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  76 {
  77         set_host_byte(scpnt, result);
  78         zfcp_dbf_scsi_fail_send(scpnt);
  79         scpnt->scsi_done(scpnt);
  80 }
  81
  82 static
  83 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  84 {
  85         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  86         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  87         int    status, scsi_result, ret;
  88
  89         /* reset the status for this request */
  90         scpnt->result = 0;
  91         scpnt->host_scribble = NULL;
  92
  93         scsi_result = fc_remote_port_chkready(rport);
  94         if (unlikely(scsi_result)) {
  95                 scpnt->result = scsi_result;
  96                 zfcp_dbf_scsi_fail_send(scpnt);
  97                 scpnt->scsi_done(scpnt);
  98                 return 0;
  99         }
 100
 101         status = atomic_read(&zfcp_sdev->status);
 102         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 103                      !(atomic_read(&zfcp_sdev->port->status) &
 104                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 105                 /* only LUN access denied, but port is good
 106                  * not covered by FC transport, have to fail here */
 107                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 108                 return 0;
 109         }
 110
 111         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 112                 /* This could be
 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         zfcp_sdev->erp_action.adapter = adapter;
 140         zfcp_sdev->erp_action.sdev = sdev;
 141
 142         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 143         if (!port)
 144                 return -ENXIO;
 145
 146         zfcp_sdev->erp_action.port = port;
 147
 148         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 149         if (unit)
 150                 put_device(&unit->dev);
 151
 152         if (!unit && !(allow_lun_scan && npiv)) {
 153                 put_device(&port->dev);
 154                 return -ENXIO;
 155         }
 156
 157         zfcp_sdev->port = port;
 158         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 159         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 160         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 161         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 162         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 163         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 164         spin_lock_init(&zfcp_sdev->latencies.lock);
 165
 166         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 167         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 168         zfcp_erp_wait(port->adapter);
 169
 170         return 0;
 171 }
 172
 173 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 174 {
 175         struct Scsi_Host *scsi_host = scpnt->device->host;
 176         struct zfcp_adapter *adapter =
 177                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 178         struct zfcp_fsf_req *old_req, *abrt_req;
 179         unsigned long flags;
 180         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 181         int retval = SUCCESS, ret;
 182         int retry = 3;
 183         char *dbf_tag;
 184
 185         /* avoid race condition between late normal completion and abort */
 186         write_lock_irqsave(&adapter->abort_lock, flags);
 187
 188         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 189         if (!old_req) {
 190                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 191                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 192                 return FAILED; /* completion could be in progress */
 193         }
 194         old_req->data = NULL;
 195
 196         /* don't access old fsf_req after releasing the abort_lock */
 197         write_unlock_irqrestore(&adapter->abort_lock, flags);
 198
 199         while (retry--) {
 200                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 201                 if (abrt_req)
 202                         break;
 203
 204                 zfcp_erp_wait(adapter);
 205                 ret = fc_block_scsi_eh(scpnt);
 206                 if (ret) {
 207                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 208                         return ret;
 209                 }
 210                 if (!(atomic_read(&adapter->status) &
 211                       ZFCP_STATUS_COMMON_RUNNING)) {
 212                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 213                         return SUCCESS;
 214                 }
 215         }
 216         if (!abrt_req) {
 217                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 218                 return FAILED;
 219         }
 220
 221         wait_for_completion(&abrt_req->completion);
 222
 223         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 224                 dbf_tag = "abrt_ok";
 225         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 226                 dbf_tag = "abrt_nn";
 227         else {
 228                 dbf_tag = "abrt_fa";
 229                 retval = FAILED;
 230         }
 231         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 232         zfcp_fsf_req_free(abrt_req);
 233         return retval;
 234 }
 235
 236 struct zfcp_scsi_req_filter {
 237         u8 tmf_scope;
 238         u32 lun_handle;
 239         u32 port_handle;
 240 };
 241
 242 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 243 {
 244         struct zfcp_scsi_req_filter *filter =
 245                 (struct zfcp_scsi_req_filter *)data;
 246
 247         /* already aborted - prevent side-effects - or not a SCSI command */
 248         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 249                 return;
 250
 251         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 252         if (old_req->qtcb->header.port_handle != filter->port_handle)
 253                 return;
 254
 255         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 256             old_req->qtcb->header.lun_handle != filter->lun_handle)
 257                 return;
 258
 259         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 260         old_req->data = NULL;
 261 }
 262
 263 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 264 {
 265         struct zfcp_adapter *adapter = zsdev->port->adapter;
 266         struct zfcp_scsi_req_filter filter = {
 267                 .tmf_scope = FCP_TMF_TGT_RESET,
 268                 .port_handle = zsdev->port->handle,
 269         };
 270         unsigned long flags;
 271
 272         if (tm_flags == FCP_TMF_LUN_RESET) {
 273                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 274                 filter.lun_handle = zsdev->lun_handle;
 275         }
 276
 277         /*
 278          * abort_lock secures against other processings - in the abort-function
 279          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 280          */
 281         write_lock_irqsave(&adapter->abort_lock, flags);
 282         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 283                                    &filter);
 284         write_unlock_irqrestore(&adapter->abort_lock, flags);
 285 }
 286
 287 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 288 {
 289         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 290         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 291         struct zfcp_fsf_req *fsf_req = NULL;
 292         int retval = SUCCESS, ret;
 293         int retry = 3;
 294
 295         while (retry--) {
 296                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 297                 if (fsf_req)
 298                         break;
 299
 300                 zfcp_erp_wait(adapter);
 301                 ret = fc_block_scsi_eh(scpnt);
 302                 if (ret) {
 303                         zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL);
 304                         return ret;
 305                 }
 306
 307                 if (!(atomic_read(&adapter->status) &
 308                       ZFCP_STATUS_COMMON_RUNNING)) {
 309                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL);
 310                         return SUCCESS;
 311                 }
 312         }
 313         if (!fsf_req) {
 314                 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL);
 315                 return FAILED;
 316         }
 317
 318         wait_for_completion(&fsf_req->completion);
 319
 320         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 321                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req);
 322                 retval = FAILED;
 323         } else {
 324                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req);
 325                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 326         }
 327
 328         zfcp_fsf_req_free(fsf_req);
 329         return retval;
 330 }
 331
 332 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 333 {
 334         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 335 }
 336
 337 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 338 {
 339         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 340 }
 341
 342 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 343 {
 344         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 345         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 346         int ret;
 347
 348         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 349         zfcp_erp_wait(adapter);
 350         ret = fc_block_scsi_eh(scpnt);
 351         if (ret)
 352                 return ret;
 353
 354         return SUCCESS;
 355 }
 356
 357 struct scsi_transport_template *zfcp_scsi_transport_template;
 358
 359 static struct scsi_host_template zfcp_scsi_host_template = {
 360         .module                  = THIS_MODULE,
 361         .name                    = "zfcp",
 362         .queuecommand            = zfcp_scsi_queuecommand,
 363         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 364         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 365         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 366         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 367         .slave_alloc             = zfcp_scsi_slave_alloc,
 368         .slave_configure         = zfcp_scsi_slave_configure,
 369         .slave_destroy           = zfcp_scsi_slave_destroy,
 370         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 371         .proc_name               = "zfcp",
 372         .can_queue               = 4096,
 373         .this_id                 = -1,
 374         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 375                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 376                                    /* GCD, adjusted later */
 377         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 378                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 379                                    /* GCD, adjusted later */
 380         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 381         .cmd_per_lun             = 1,
 382         .use_clustering          = 1,
 383         .shost_attrs             = zfcp_sysfs_shost_attrs,
 384         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 385 };
 386
 387 /**
 388  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 389  * @adapter: The zfcp adapter to register with the SCSI midlayer
 390  */
 391 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 392 {
 393         struct ccw_dev_id dev_id;
 394
 395         if (adapter->scsi_host)
 396                 return 0;
 397
 398         ccw_device_get_id(adapter->ccw_device, &dev_id);
 399         /* register adapter as SCSI host with mid layer of SCSI stack */
 400         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 401                                              sizeof (struct zfcp_adapter *));
 402         if (!adapter->scsi_host) {
 403                 dev_err(&adapter->ccw_device->dev,
 404                         "Registering the FCP device with the "
 405                         "SCSI stack failed\n");
 406                 return -EIO;
 407         }
 408
 409         /* tell the SCSI stack some characteristics of this adapter */
 410         adapter->scsi_host->max_id = 511;
 411         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 412         adapter->scsi_host->max_channel = 0;
 413         adapter->scsi_host->unique_id = dev_id.devno;
 414         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 415         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 416
 417         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 418
 419         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 420                 scsi_host_put(adapter->scsi_host);
 421                 return -EIO;
 422         }
 423
 424         return 0;
 425 }
 426
 427 /**
 428  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 429  * @adapter: The zfcp adapter to unregister.
 430  */
 431 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 432 {
 433         struct Scsi_Host *shost;
 434         struct zfcp_port *port;
 435
 436         shost = adapter->scsi_host;
 437         if (!shost)
 438                 return;
 439
 440         read_lock_irq(&adapter->port_list_lock);
 441         list_for_each_entry(port, &adapter->port_list, list)
 442                 port->rport = NULL;
 443         read_unlock_irq(&adapter->port_list_lock);
 444
 445         fc_remove_host(shost);
 446         scsi_remove_host(shost);
 447         scsi_host_put(shost);
 448         adapter->scsi_host = NULL;
 449 }
 450
 451 static struct fc_host_statistics*
 452 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 453 {
 454         struct fc_host_statistics *fc_stats;
 455
 456         if (!adapter->fc_stats) {
 457                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 458                 if (!fc_stats)
 459                         return NULL;
 460                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 461         }
 462         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 463         return adapter->fc_stats;
 464 }
 465
 466 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 467                                       struct fsf_qtcb_bottom_port *data,
 468                                       struct fsf_qtcb_bottom_port *old)
 469 {
 470         fc_stats->seconds_since_last_reset =
 471                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 472         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 473         fc_stats->tx_words = data->tx_words - old->tx_words;
 474         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 475         fc_stats->rx_words = data->rx_words - old->rx_words;
 476         fc_stats->lip_count = data->lip - old->lip;
 477         fc_stats->nos_count = data->nos - old->nos;
 478         fc_stats->error_frames = data->error_frames - old->error_frames;
 479         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 480         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 481         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 482         fc_stats->loss_of_signal_count =
 483                 data->loss_of_signal - old->loss_of_signal;
 484         fc_stats->prim_seq_protocol_err_count =
 485                 data->psp_error_counts - old->psp_error_counts;
 486         fc_stats->invalid_tx_word_count =
 487                 data->invalid_tx_words - old->invalid_tx_words;
 488         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 489         fc_stats->fcp_input_requests =
 490                 data->input_requests - old->input_requests;
 491         fc_stats->fcp_output_requests =
 492                 data->output_requests - old->output_requests;
 493         fc_stats->fcp_control_requests =
 494                 data->control_requests - old->control_requests;
 495         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 496         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 497 }
 498
 499 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 500                                    struct fsf_qtcb_bottom_port *data)
 501 {
 502         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 503         fc_stats->tx_frames = data->tx_frames;
 504         fc_stats->tx_words = data->tx_words;
 505         fc_stats->rx_frames = data->rx_frames;
 506         fc_stats->rx_words = data->rx_words;
 507         fc_stats->lip_count = data->lip;
 508         fc_stats->nos_count = data->nos;
 509         fc_stats->error_frames = data->error_frames;
 510         fc_stats->dumped_frames = data->dumped_frames;
 511         fc_stats->link_failure_count = data->link_failure;
 512         fc_stats->loss_of_sync_count = data->loss_of_sync;
 513         fc_stats->loss_of_signal_count = data->loss_of_signal;
 514         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 515         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 516         fc_stats->invalid_crc_count = data->invalid_crcs;
 517         fc_stats->fcp_input_requests = data->input_requests;
 518         fc_stats->fcp_output_requests = data->output_requests;
 519         fc_stats->fcp_control_requests = data->control_requests;
 520         fc_stats->fcp_input_megabytes = data->input_mb;
 521         fc_stats->fcp_output_megabytes = data->output_mb;
 522 }
 523
 524 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 525 {
 526         struct zfcp_adapter *adapter;
 527         struct fc_host_statistics *fc_stats;
 528         struct fsf_qtcb_bottom_port *data;
 529         int ret;
 530
 531         adapter = (struct zfcp_adapter *)host->hostdata[0];
 532         fc_stats = zfcp_init_fc_host_stats(adapter);
 533         if (!fc_stats)
 534                 return NULL;
 535
 536         data = kzalloc(sizeof(*data), GFP_KERNEL);
 537         if (!data)
 538                 return NULL;
 539
 540         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 541         if (ret) {
 542                 kfree(data);
 543                 return NULL;
 544         }
 545
 546         if (adapter->stats_reset &&
 547             ((jiffies/HZ - adapter->stats_reset) <
 548              data->seconds_since_last_reset))
 549                 zfcp_adjust_fc_host_stats(fc_stats, data,
 550                                           adapter->stats_reset_data);
 551         else
 552                 zfcp_set_fc_host_stats(fc_stats, data);
 553
 554         kfree(data);
 555         return fc_stats;
 556 }
 557
 558 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 559 {
 560         struct zfcp_adapter *adapter;
 561         struct fsf_qtcb_bottom_port *data;
 562         int ret;
 563
 564         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 565         data = kzalloc(sizeof(*data), GFP_KERNEL);
 566         if (!data)
 567                 return;
 568
 569         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 570         if (ret)
 571                 kfree(data);
 572         else {
 573                 adapter->stats_reset = jiffies/HZ;
 574                 kfree(adapter->stats_reset_data);
 575                 adapter->stats_reset_data = data; /* finally freed in
 576                                                      adapter_release */
 577         }
 578 }
 579
 580 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 581 {
 582         struct zfcp_adapter *adapter =
 583                 (struct zfcp_adapter *)shost->hostdata[0];
 584         int status = atomic_read(&adapter->status);
 585
 586         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 587             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 588                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 589         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 590                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 591         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 592                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 593         else
 594                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 595 }
 596
 597 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 598 {
 599         rport->dev_loss_tmo = timeout;
 600 }
 601
 602 /**
 603  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 604  * @rport: The FC rport where to teminate I/O
 605  *
 606  * Abort all pending SCSI commands for a port by closing the
 607  * port. Using a reopen avoids a conflict with a shutdown
 608  * overwriting a reopen. The "forced" ensures that a disappeared port
 609  * is not opened again as valid due to the cached plogi data in
 610  * non-NPIV mode.
 611  */
 612 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 613 {
 614         struct zfcp_port *port;
 615         struct Scsi_Host *shost = rport_to_shost(rport);
 616         struct zfcp_adapter *adapter =
 617                 (struct zfcp_adapter *)shost->hostdata[0];
 618
 619         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 620
 621         if (port) {
 622                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 623                 put_device(&port->dev);
 624         }
 625 }
 626
 627 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 628 {
 629         struct fc_rport_identifiers ids;
 630         struct fc_rport *rport;
 631
 632         if (port->rport)
 633                 return;
 634
 635         ids.node_name = port->wwnn;
 636         ids.port_name = port->wwpn;
 637         ids.port_id = port->d_id;
 638         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 639
 640         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 641                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 642                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 643         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 644         if (!rport) {
 645                 dev_err(&port->adapter->ccw_device->dev,
 646                         "Registering port 0x%016Lx failed\n",
 647                         (unsigned long long)port->wwpn);
 648                 return;
 649         }
 650
 651         rport->maxframe_size = port->maxframe_size;
 652         rport->supported_classes = port->supported_classes;
 653         port->rport = rport;
 654         port->starget_id = rport->scsi_target_id;
 655
 656         zfcp_unit_queue_scsi_scan(port);
 657 }
 658
 659 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 660 {
 661         struct fc_rport *rport = port->rport;
 662
 663         if (rport) {
 664                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 665                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 666                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 667                 fc_remote_port_delete(rport);
 668                 port->rport = NULL;
 669         }
 670 }
 671
 672 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 673 {
 674         get_device(&port->dev);
 675         port->rport_task = RPORT_ADD;
 676
 677         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 678                 put_device(&port->dev);
 679 }
 680
 681 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 682 {
 683         get_device(&port->dev);
 684         port->rport_task = RPORT_DEL;
 685
 686         if (port->rport && queue_work(port->adapter->work_queue,
 687                                       &port->rport_work))
 688                 return;
 689
 690         put_device(&port->dev);
 691 }
 692
 693 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 694 {
 695         unsigned long flags;
 696         struct zfcp_port *port;
 697
 698         read_lock_irqsave(&adapter->port_list_lock, flags);
 699         list_for_each_entry(port, &adapter->port_list, list)
 700                 zfcp_scsi_schedule_rport_block(port);
 701         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 702 }
 703
 704 void zfcp_scsi_rport_work(struct work_struct *work)
 705 {
 706         struct zfcp_port *port = container_of(work, struct zfcp_port,
 707                                               rport_work);
 708
 709         while (port->rport_task) {
 710                 if (port->rport_task == RPORT_ADD) {
 711                         port->rport_task = RPORT_NONE;
 712                         zfcp_scsi_rport_register(port);
 713                 } else {
 714                         port->rport_task = RPORT_NONE;
 715                         zfcp_scsi_rport_block(port);
 716                 }
 717         }
 718
 719         put_device(&port->dev);
 720 }
 721
 722 /**
 723  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 724  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 725  */
 726 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 727 {
 728         unsigned int mask = 0;
 729         unsigned int data_div;
 730         struct Scsi_Host *shost = adapter->scsi_host;
 731
 732         data_div = atomic_read(&adapter->status) &
 733                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 734
 735         if (enable_dif &&
 736             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 737                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 738
 739         if (enable_dif && data_div &&
 740             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 741                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 742                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 743                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 744                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 745                 shost->max_sectors = shost->sg_tablesize * 8;
 746         }
 747
 748         scsi_host_set_prot(shost, mask);
 749 }
 750
 751 /**
 752  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 753  * @scmd: The SCSI command to report the error for
 754  * @ascq: The ASCQ to put in the sense buffer
 755  *
 756  * See the error handling in sd_done for the sense codes used here.
 757  * Set DID_SOFT_ERROR to retry the request, if possible.
 758  */
 759 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 760 {
 761         scsi_build_sense_buffer(1, scmd->sense_buffer,
 762                                 ILLEGAL_REQUEST, 0x10, ascq);
 763         set_driver_byte(scmd, DRIVER_SENSE);
 764         scmd->result |= SAM_STAT_CHECK_CONDITION;
 765         set_host_byte(scmd, DID_SOFT_ERROR);
 766 }
 767
 768 struct fc_function_template zfcp_transport_functions = {
 769         .show_starget_port_id = 1,
 770         .show_starget_port_name = 1,
 771         .show_starget_node_name = 1,
 772         .show_rport_supported_classes = 1,
 773         .show_rport_maxframe_size = 1,
 774         .show_rport_dev_loss_tmo = 1,
 775         .show_host_node_name = 1,
 776         .show_host_port_name = 1,
 777         .show_host_permanent_port_name = 1,
 778         .show_host_supported_classes = 1,
 779         .show_host_supported_fc4s = 1,
 780         .show_host_supported_speeds = 1,
 781         .show_host_maxframe_size = 1,
 782         .show_host_serial_number = 1,
 783         .get_fc_host_stats = zfcp_get_fc_host_stats,
 784         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 785         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 786         .get_host_port_state = zfcp_get_host_port_state,
 787         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 788         .show_host_port_state = 1,
 789         .show_host_active_fc4s = 1,
 790         .bsg_request = zfcp_fc_exec_bsg_job,
 791         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 792         /* no functions registered for following dynamic attributes but
 793            directly set by LLDD */
 794         .show_host_port_type = 1,
 795         .show_host_symbolic_name = 1,
 796         .show_host_speed = 1,
 797         .show_host_port_id = 1,
 798         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 799 };