drivers/s390/scsi/zfcp_scsi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Interface to Linux SCSI midlayer.
   6  *
   7  * Copyright IBM Corp. 2002, 2017
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/slab.h>
  16 #include <scsi/fc/fc_fcp.h>
  17 #include <scsi/scsi_eh.h>
  18 #include <linux/atomic.h>
  19 #include "zfcp_ext.h"
  20 #include "zfcp_dbf.h"
  21 #include "zfcp_fc.h"
  22 #include "zfcp_reqlist.h"
  23
  24 static unsigned int default_depth = 32;
  25 module_param_named(queue_depth, default_depth, uint, 0600);
  26 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  27
  28 static bool enable_dif;
  29 module_param_named(dif, enable_dif, bool, 0400);
  30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  31
  32 static bool allow_lun_scan = true;
  33 module_param(allow_lun_scan, bool, 0600);
  34 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  35
  36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  37 {
  38         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  39
  40         /* if previous slave_alloc returned early, there is nothing to do */
  41         if (!zfcp_sdev->port)
  42                 return;
  43
  44         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  45         put_device(&zfcp_sdev->port->dev);
  46 }
  47
  48 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  49 {
  50         if (sdp->tagged_supported)
  51                 scsi_change_queue_depth(sdp, default_depth);
  52         return 0;
  53 }
  54
  55 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  56 {
  57         set_host_byte(scpnt, result);
  58         zfcp_dbf_scsi_fail_send(scpnt);
  59         scpnt->scsi_done(scpnt);
  60 }
  61
  62 static
  63 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  64 {
  65         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  66         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  67         int    status, scsi_result, ret;
  68
  69         /* reset the status for this request */
  70         scpnt->result = 0;
  71         scpnt->host_scribble = NULL;
  72
  73         scsi_result = fc_remote_port_chkready(rport);
  74         if (unlikely(scsi_result)) {
  75                 scpnt->result = scsi_result;
  76                 zfcp_dbf_scsi_fail_send(scpnt);
  77                 scpnt->scsi_done(scpnt);
  78                 return 0;
  79         }
  80
  81         status = atomic_read(&zfcp_sdev->status);
  82         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  83                      !(atomic_read(&zfcp_sdev->port->status) &
  84                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
  85                 /* only LUN access denied, but port is good
  86                  * not covered by FC transport, have to fail here */
  87                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  88                 return 0;
  89         }
  90
  91         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  92                 /* This could be
  93                  * call to rport_delete pending: mimic retry from
  94                  *      fc_remote_port_chkready until rport is BLOCKED
  95                  */
  96                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
  97                 return 0;
  98         }
  99
 100         ret = zfcp_fsf_fcp_cmnd(scpnt);
 101         if (unlikely(ret == -EBUSY))
 102                 return SCSI_MLQUEUE_DEVICE_BUSY;
 103         else if (unlikely(ret < 0))
 104                 return SCSI_MLQUEUE_HOST_BUSY;
 105
 106         return ret;
 107 }
 108
 109 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 110 {
 111         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 112         struct zfcp_adapter *adapter =
 113                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 114         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 115         struct zfcp_port *port;
 116         struct zfcp_unit *unit;
 117         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 118
 119         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 120         if (!port)
 121                 return -ENXIO;
 122
 123         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 124         if (unit)
 125                 put_device(&unit->dev);
 126
 127         if (!unit && !(allow_lun_scan && npiv)) {
 128                 put_device(&port->dev);
 129                 return -ENXIO;
 130         }
 131
 132         zfcp_sdev->port = port;
 133         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 134         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 135         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 136         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 137         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 138         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 139         spin_lock_init(&zfcp_sdev->latencies.lock);
 140
 141         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 142         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 143         zfcp_erp_wait(port->adapter);
 144
 145         return 0;
 146 }
 147
 148 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 149 {
 150         struct Scsi_Host *scsi_host = scpnt->device->host;
 151         struct zfcp_adapter *adapter =
 152                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 153         struct zfcp_fsf_req *old_req, *abrt_req;
 154         unsigned long flags;
 155         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 156         int retval = SUCCESS, ret;
 157         int retry = 3;
 158         char *dbf_tag;
 159
 160         /* avoid race condition between late normal completion and abort */
 161         write_lock_irqsave(&adapter->abort_lock, flags);
 162
 163         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 164         if (!old_req) {
 165                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 166                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 167                 return FAILED; /* completion could be in progress */
 168         }
 169         old_req->data = NULL;
 170
 171         /* don't access old fsf_req after releasing the abort_lock */
 172         write_unlock_irqrestore(&adapter->abort_lock, flags);
 173
 174         while (retry--) {
 175                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 176                 if (abrt_req)
 177                         break;
 178
 179                 zfcp_erp_wait(adapter);
 180                 ret = fc_block_scsi_eh(scpnt);
 181                 if (ret) {
 182                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 183                         return ret;
 184                 }
 185                 if (!(atomic_read(&adapter->status) &
 186                       ZFCP_STATUS_COMMON_RUNNING)) {
 187                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 188                         return SUCCESS;
 189                 }
 190         }
 191         if (!abrt_req) {
 192                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 193                 return FAILED;
 194         }
 195
 196         wait_for_completion(&abrt_req->completion);
 197
 198         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 199                 dbf_tag = "abrt_ok";
 200         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 201                 dbf_tag = "abrt_nn";
 202         else {
 203                 dbf_tag = "abrt_fa";
 204                 retval = FAILED;
 205         }
 206         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 207         zfcp_fsf_req_free(abrt_req);
 208         return retval;
 209 }
 210
 211 struct zfcp_scsi_req_filter {
 212         u8 tmf_scope;
 213         u32 lun_handle;
 214         u32 port_handle;
 215 };
 216
 217 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 218 {
 219         struct zfcp_scsi_req_filter *filter =
 220                 (struct zfcp_scsi_req_filter *)data;
 221
 222         /* already aborted - prevent side-effects - or not a SCSI command */
 223         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 224                 return;
 225
 226         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 227         if (old_req->qtcb->header.port_handle != filter->port_handle)
 228                 return;
 229
 230         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 231             old_req->qtcb->header.lun_handle != filter->lun_handle)
 232                 return;
 233
 234         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 235         old_req->data = NULL;
 236 }
 237
 238 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 239 {
 240         struct zfcp_adapter *adapter = zsdev->port->adapter;
 241         struct zfcp_scsi_req_filter filter = {
 242                 .tmf_scope = FCP_TMF_TGT_RESET,
 243                 .port_handle = zsdev->port->handle,
 244         };
 245         unsigned long flags;
 246
 247         if (tm_flags == FCP_TMF_LUN_RESET) {
 248                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 249                 filter.lun_handle = zsdev->lun_handle;
 250         }
 251
 252         /*
 253          * abort_lock secures against other processings - in the abort-function
 254          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 255          */
 256         write_lock_irqsave(&adapter->abort_lock, flags);
 257         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 258                                    &filter);
 259         write_unlock_irqrestore(&adapter->abort_lock, flags);
 260 }
 261
 262 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 263 {
 264         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 265         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 266         struct zfcp_fsf_req *fsf_req = NULL;
 267         int retval = SUCCESS, ret;
 268         int retry = 3;
 269
 270         while (retry--) {
 271                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 272                 if (fsf_req)
 273                         break;
 274
 275                 zfcp_erp_wait(adapter);
 276                 ret = fc_block_scsi_eh(scpnt);
 277                 if (ret) {
 278                         zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL);
 279                         return ret;
 280                 }
 281
 282                 if (!(atomic_read(&adapter->status) &
 283                       ZFCP_STATUS_COMMON_RUNNING)) {
 284                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL);
 285                         return SUCCESS;
 286                 }
 287         }
 288         if (!fsf_req) {
 289                 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL);
 290                 return FAILED;
 291         }
 292
 293         wait_for_completion(&fsf_req->completion);
 294
 295         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 296                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req);
 297                 retval = FAILED;
 298         } else {
 299                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req);
 300                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 301         }
 302
 303         zfcp_fsf_req_free(fsf_req);
 304         return retval;
 305 }
 306
 307 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 308 {
 309         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 310 }
 311
 312 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 313 {
 314         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 315 }
 316
 317 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 318 {
 319         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 320         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 321         int ret;
 322
 323         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 324         zfcp_erp_wait(adapter);
 325         ret = fc_block_scsi_eh(scpnt);
 326         if (ret)
 327                 return ret;
 328
 329         return SUCCESS;
 330 }
 331
 332 struct scsi_transport_template *zfcp_scsi_transport_template;
 333
 334 static struct scsi_host_template zfcp_scsi_host_template = {
 335         .module                  = THIS_MODULE,
 336         .name                    = "zfcp",
 337         .queuecommand            = zfcp_scsi_queuecommand,
 338         .eh_timed_out            = fc_eh_timed_out,
 339         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 340         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 341         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 342         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 343         .slave_alloc             = zfcp_scsi_slave_alloc,
 344         .slave_configure         = zfcp_scsi_slave_configure,
 345         .slave_destroy           = zfcp_scsi_slave_destroy,
 346         .change_queue_depth      = scsi_change_queue_depth,
 347         .proc_name               = "zfcp",
 348         .can_queue               = 4096,
 349         .this_id                 = -1,
 350         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 351                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 352                                    /* GCD, adjusted later */
 353         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 354                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 355                                    /* GCD, adjusted later */
 356         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 357         .use_clustering          = 1,
 358         .shost_attrs             = zfcp_sysfs_shost_attrs,
 359         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 360         .track_queue_depth       = 1,
 361 };
 362
 363 /**
 364  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 365  * @adapter: The zfcp adapter to register with the SCSI midlayer
 366  */
 367 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 368 {
 369         struct ccw_dev_id dev_id;
 370
 371         if (adapter->scsi_host)
 372                 return 0;
 373
 374         ccw_device_get_id(adapter->ccw_device, &dev_id);
 375         /* register adapter as SCSI host with mid layer of SCSI stack */
 376         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 377                                              sizeof (struct zfcp_adapter *));
 378         if (!adapter->scsi_host) {
 379                 dev_err(&adapter->ccw_device->dev,
 380                         "Registering the FCP device with the "
 381                         "SCSI stack failed\n");
 382                 return -EIO;
 383         }
 384
 385         /* tell the SCSI stack some characteristics of this adapter */
 386         adapter->scsi_host->max_id = 511;
 387         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 388         adapter->scsi_host->max_channel = 0;
 389         adapter->scsi_host->unique_id = dev_id.devno;
 390         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 391         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 392
 393         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 394
 395         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 396                 scsi_host_put(adapter->scsi_host);
 397                 return -EIO;
 398         }
 399
 400         return 0;
 401 }
 402
 403 /**
 404  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 405  * @adapter: The zfcp adapter to unregister.
 406  */
 407 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 408 {
 409         struct Scsi_Host *shost;
 410         struct zfcp_port *port;
 411
 412         shost = adapter->scsi_host;
 413         if (!shost)
 414                 return;
 415
 416         read_lock_irq(&adapter->port_list_lock);
 417         list_for_each_entry(port, &adapter->port_list, list)
 418                 port->rport = NULL;
 419         read_unlock_irq(&adapter->port_list_lock);
 420
 421         fc_remove_host(shost);
 422         scsi_remove_host(shost);
 423         scsi_host_put(shost);
 424         adapter->scsi_host = NULL;
 425 }
 426
 427 static struct fc_host_statistics*
 428 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 429 {
 430         struct fc_host_statistics *fc_stats;
 431
 432         if (!adapter->fc_stats) {
 433                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 434                 if (!fc_stats)
 435                         return NULL;
 436                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 437         }
 438         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 439         return adapter->fc_stats;
 440 }
 441
 442 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 443                                       struct fsf_qtcb_bottom_port *data,
 444                                       struct fsf_qtcb_bottom_port *old)
 445 {
 446         fc_stats->seconds_since_last_reset =
 447                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 448         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 449         fc_stats->tx_words = data->tx_words - old->tx_words;
 450         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 451         fc_stats->rx_words = data->rx_words - old->rx_words;
 452         fc_stats->lip_count = data->lip - old->lip;
 453         fc_stats->nos_count = data->nos - old->nos;
 454         fc_stats->error_frames = data->error_frames - old->error_frames;
 455         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 456         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 457         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 458         fc_stats->loss_of_signal_count =
 459                 data->loss_of_signal - old->loss_of_signal;
 460         fc_stats->prim_seq_protocol_err_count =
 461                 data->psp_error_counts - old->psp_error_counts;
 462         fc_stats->invalid_tx_word_count =
 463                 data->invalid_tx_words - old->invalid_tx_words;
 464         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 465         fc_stats->fcp_input_requests =
 466                 data->input_requests - old->input_requests;
 467         fc_stats->fcp_output_requests =
 468                 data->output_requests - old->output_requests;
 469         fc_stats->fcp_control_requests =
 470                 data->control_requests - old->control_requests;
 471         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 472         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 473 }
 474
 475 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 476                                    struct fsf_qtcb_bottom_port *data)
 477 {
 478         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 479         fc_stats->tx_frames = data->tx_frames;
 480         fc_stats->tx_words = data->tx_words;
 481         fc_stats->rx_frames = data->rx_frames;
 482         fc_stats->rx_words = data->rx_words;
 483         fc_stats->lip_count = data->lip;
 484         fc_stats->nos_count = data->nos;
 485         fc_stats->error_frames = data->error_frames;
 486         fc_stats->dumped_frames = data->dumped_frames;
 487         fc_stats->link_failure_count = data->link_failure;
 488         fc_stats->loss_of_sync_count = data->loss_of_sync;
 489         fc_stats->loss_of_signal_count = data->loss_of_signal;
 490         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 491         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 492         fc_stats->invalid_crc_count = data->invalid_crcs;
 493         fc_stats->fcp_input_requests = data->input_requests;
 494         fc_stats->fcp_output_requests = data->output_requests;
 495         fc_stats->fcp_control_requests = data->control_requests;
 496         fc_stats->fcp_input_megabytes = data->input_mb;
 497         fc_stats->fcp_output_megabytes = data->output_mb;
 498 }
 499
 500 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 501 {
 502         struct zfcp_adapter *adapter;
 503         struct fc_host_statistics *fc_stats;
 504         struct fsf_qtcb_bottom_port *data;
 505         int ret;
 506
 507         adapter = (struct zfcp_adapter *)host->hostdata[0];
 508         fc_stats = zfcp_init_fc_host_stats(adapter);
 509         if (!fc_stats)
 510                 return NULL;
 511
 512         data = kzalloc(sizeof(*data), GFP_KERNEL);
 513         if (!data)
 514                 return NULL;
 515
 516         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 517         if (ret) {
 518                 kfree(data);
 519                 return NULL;
 520         }
 521
 522         if (adapter->stats_reset &&
 523             ((jiffies/HZ - adapter->stats_reset) <
 524              data->seconds_since_last_reset))
 525                 zfcp_adjust_fc_host_stats(fc_stats, data,
 526                                           adapter->stats_reset_data);
 527         else
 528                 zfcp_set_fc_host_stats(fc_stats, data);
 529
 530         kfree(data);
 531         return fc_stats;
 532 }
 533
 534 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 535 {
 536         struct zfcp_adapter *adapter;
 537         struct fsf_qtcb_bottom_port *data;
 538         int ret;
 539
 540         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 541         data = kzalloc(sizeof(*data), GFP_KERNEL);
 542         if (!data)
 543                 return;
 544
 545         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 546         if (ret)
 547                 kfree(data);
 548         else {
 549                 adapter->stats_reset = jiffies/HZ;
 550                 kfree(adapter->stats_reset_data);
 551                 adapter->stats_reset_data = data; /* finally freed in
 552                                                      adapter_release */
 553         }
 554 }
 555
 556 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 557 {
 558         struct zfcp_adapter *adapter =
 559                 (struct zfcp_adapter *)shost->hostdata[0];
 560         int status = atomic_read(&adapter->status);
 561
 562         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 563             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 564                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 565         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 566                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 567         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 568                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 569         else
 570                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 571 }
 572
 573 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 574 {
 575         rport->dev_loss_tmo = timeout;
 576 }
 577
 578 /**
 579  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 580  * @rport: The FC rport where to teminate I/O
 581  *
 582  * Abort all pending SCSI commands for a port by closing the
 583  * port. Using a reopen avoids a conflict with a shutdown
 584  * overwriting a reopen. The "forced" ensures that a disappeared port
 585  * is not opened again as valid due to the cached plogi data in
 586  * non-NPIV mode.
 587  */
 588 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 589 {
 590         struct zfcp_port *port;
 591         struct Scsi_Host *shost = rport_to_shost(rport);
 592         struct zfcp_adapter *adapter =
 593                 (struct zfcp_adapter *)shost->hostdata[0];
 594
 595         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 596
 597         if (port) {
 598                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 599                 put_device(&port->dev);
 600         }
 601 }
 602
 603 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 604 {
 605         struct fc_rport_identifiers ids;
 606         struct fc_rport *rport;
 607
 608         if (port->rport)
 609                 return;
 610
 611         ids.node_name = port->wwnn;
 612         ids.port_name = port->wwpn;
 613         ids.port_id = port->d_id;
 614         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 615
 616         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 617                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 618                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 619         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 620         if (!rport) {
 621                 dev_err(&port->adapter->ccw_device->dev,
 622                         "Registering port 0x%016Lx failed\n",
 623                         (unsigned long long)port->wwpn);
 624                 return;
 625         }
 626
 627         rport->maxframe_size = port->maxframe_size;
 628         rport->supported_classes = port->supported_classes;
 629         port->rport = rport;
 630         port->starget_id = rport->scsi_target_id;
 631
 632         zfcp_unit_queue_scsi_scan(port);
 633 }
 634
 635 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 636 {
 637         struct fc_rport *rport = port->rport;
 638
 639         if (rport) {
 640                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 641                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 642                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 643                 fc_remote_port_delete(rport);
 644                 port->rport = NULL;
 645         }
 646 }
 647
 648 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 649 {
 650         get_device(&port->dev);
 651         port->rport_task = RPORT_ADD;
 652
 653         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 654                 put_device(&port->dev);
 655 }
 656
 657 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 658 {
 659         get_device(&port->dev);
 660         port->rport_task = RPORT_DEL;
 661
 662         if (port->rport && queue_work(port->adapter->work_queue,
 663                                       &port->rport_work))
 664                 return;
 665
 666         put_device(&port->dev);
 667 }
 668
 669 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 670 {
 671         unsigned long flags;
 672         struct zfcp_port *port;
 673
 674         read_lock_irqsave(&adapter->port_list_lock, flags);
 675         list_for_each_entry(port, &adapter->port_list, list)
 676                 zfcp_scsi_schedule_rport_block(port);
 677         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 678 }
 679
 680 void zfcp_scsi_rport_work(struct work_struct *work)
 681 {
 682         struct zfcp_port *port = container_of(work, struct zfcp_port,
 683                                               rport_work);
 684
 685         while (port->rport_task) {
 686                 if (port->rport_task == RPORT_ADD) {
 687                         port->rport_task = RPORT_NONE;
 688                         zfcp_scsi_rport_register(port);
 689                 } else {
 690                         port->rport_task = RPORT_NONE;
 691                         zfcp_scsi_rport_block(port);
 692                 }
 693         }
 694
 695         put_device(&port->dev);
 696 }
 697
 698 /**
 699  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 700  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 701  */
 702 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 703 {
 704         unsigned int mask = 0;
 705         unsigned int data_div;
 706         struct Scsi_Host *shost = adapter->scsi_host;
 707
 708         data_div = atomic_read(&adapter->status) &
 709                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 710
 711         if (enable_dif &&
 712             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 713                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 714
 715         if (enable_dif && data_div &&
 716             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 717                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 718                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 719                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 720                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 721                 shost->max_sectors = shost->sg_tablesize * 8;
 722         }
 723
 724         scsi_host_set_prot(shost, mask);
 725 }
 726
 727 /**
 728  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 729  * @scmd: The SCSI command to report the error for
 730  * @ascq: The ASCQ to put in the sense buffer
 731  *
 732  * See the error handling in sd_done for the sense codes used here.
 733  * Set DID_SOFT_ERROR to retry the request, if possible.
 734  */
 735 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 736 {
 737         scsi_build_sense_buffer(1, scmd->sense_buffer,
 738                                 ILLEGAL_REQUEST, 0x10, ascq);
 739         set_driver_byte(scmd, DRIVER_SENSE);
 740         scmd->result |= SAM_STAT_CHECK_CONDITION;
 741         set_host_byte(scmd, DID_SOFT_ERROR);
 742 }
 743
 744 struct fc_function_template zfcp_transport_functions = {
 745         .show_starget_port_id = 1,
 746         .show_starget_port_name = 1,
 747         .show_starget_node_name = 1,
 748         .show_rport_supported_classes = 1,
 749         .show_rport_maxframe_size = 1,
 750         .show_rport_dev_loss_tmo = 1,
 751         .show_host_node_name = 1,
 752         .show_host_port_name = 1,
 753         .show_host_permanent_port_name = 1,
 754         .show_host_supported_classes = 1,
 755         .show_host_supported_fc4s = 1,
 756         .show_host_supported_speeds = 1,
 757         .show_host_maxframe_size = 1,
 758         .show_host_serial_number = 1,
 759         .get_fc_host_stats = zfcp_get_fc_host_stats,
 760         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 761         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 762         .get_host_port_state = zfcp_get_host_port_state,
 763         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 764         .show_host_port_state = 1,
 765         .show_host_active_fc4s = 1,
 766         .bsg_request = zfcp_fc_exec_bsg_job,
 767         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 768         /* no functions registered for following dynamic attributes but
 769            directly set by LLDD */
 770         .show_host_port_type = 1,
 771         .show_host_symbolic_name = 1,
 772         .show_host_speed = 1,
 773         .show_host_port_id = 1,
 774         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 775 };