drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corp. 2002, 2016
   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         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 140         if (!port)
 141                 return -ENXIO;
 142
 143         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 144         if (unit)
 145                 put_device(&unit->dev);
 146
 147         if (!unit && !(allow_lun_scan && npiv)) {
 148                 put_device(&port->dev);
 149                 return -ENXIO;
 150         }
 151
 152         zfcp_sdev->port = port;
 153         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 154         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 155         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 157         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 158         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 159         spin_lock_init(&zfcp_sdev->latencies.lock);
 160
 161         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 162         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 163         zfcp_erp_wait(port->adapter);
 164
 165         return 0;
 166 }
 167
 168 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 169 {
 170         struct Scsi_Host *scsi_host = scpnt->device->host;
 171         struct zfcp_adapter *adapter =
 172                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 173         struct zfcp_fsf_req *old_req, *abrt_req;
 174         unsigned long flags;
 175         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 176         int retval = SUCCESS, ret;
 177         int retry = 3;
 178         char *dbf_tag;
 179
 180         /* avoid race condition between late normal completion and abort */
 181         write_lock_irqsave(&adapter->abort_lock, flags);
 182
 183         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 184         if (!old_req) {
 185                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 186                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 187                 return FAILED; /* completion could be in progress */
 188         }
 189         old_req->data = NULL;
 190
 191         /* don't access old fsf_req after releasing the abort_lock */
 192         write_unlock_irqrestore(&adapter->abort_lock, flags);
 193
 194         while (retry--) {
 195                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 196                 if (abrt_req)
 197                         break;
 198
 199                 zfcp_erp_wait(adapter);
 200                 ret = fc_block_scsi_eh(scpnt);
 201                 if (ret) {
 202                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 203                         return ret;
 204                 }
 205                 if (!(atomic_read(&adapter->status) &
 206                       ZFCP_STATUS_COMMON_RUNNING)) {
 207                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 208                         return SUCCESS;
 209                 }
 210         }
 211         if (!abrt_req) {
 212                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 213                 return FAILED;
 214         }
 215
 216         wait_for_completion(&abrt_req->completion);
 217
 218         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 219                 dbf_tag = "abrt_ok";
 220         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 221                 dbf_tag = "abrt_nn";
 222         else {
 223                 dbf_tag = "abrt_fa";
 224                 retval = FAILED;
 225         }
 226         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 227         zfcp_fsf_req_free(abrt_req);
 228         return retval;
 229 }
 230
 231 struct zfcp_scsi_req_filter {
 232         u8 tmf_scope;
 233         u32 lun_handle;
 234         u32 port_handle;
 235 };
 236
 237 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 238 {
 239         struct zfcp_scsi_req_filter *filter =
 240                 (struct zfcp_scsi_req_filter *)data;
 241
 242         /* already aborted - prevent side-effects - or not a SCSI command */
 243         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 244                 return;
 245
 246         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 247         if (old_req->qtcb->header.port_handle != filter->port_handle)
 248                 return;
 249
 250         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 251             old_req->qtcb->header.lun_handle != filter->lun_handle)
 252                 return;
 253
 254         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 255         old_req->data = NULL;
 256 }
 257
 258 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 259 {
 260         struct zfcp_adapter *adapter = zsdev->port->adapter;
 261         struct zfcp_scsi_req_filter filter = {
 262                 .tmf_scope = FCP_TMF_TGT_RESET,
 263                 .port_handle = zsdev->port->handle,
 264         };
 265         unsigned long flags;
 266
 267         if (tm_flags == FCP_TMF_LUN_RESET) {
 268                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 269                 filter.lun_handle = zsdev->lun_handle;
 270         }
 271
 272         /*
 273          * abort_lock secures against other processings - in the abort-function
 274          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 275          */
 276         write_lock_irqsave(&adapter->abort_lock, flags);
 277         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 278                                    &filter);
 279         write_unlock_irqrestore(&adapter->abort_lock, flags);
 280 }
 281
 282 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 283 {
 284         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 285         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 286         struct zfcp_fsf_req *fsf_req = NULL;
 287         int retval = SUCCESS, ret;
 288         int retry = 3;
 289
 290         while (retry--) {
 291                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 292                 if (fsf_req)
 293                         break;
 294
 295                 zfcp_erp_wait(adapter);
 296                 ret = fc_block_scsi_eh(scpnt);
 297                 if (ret) {
 298                         zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags);
 299                         return ret;
 300                 }
 301
 302                 if (!(atomic_read(&adapter->status) &
 303                       ZFCP_STATUS_COMMON_RUNNING)) {
 304                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 305                         return SUCCESS;
 306                 }
 307         }
 308         if (!fsf_req) {
 309                 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags);
 310                 return FAILED;
 311         }
 312
 313         wait_for_completion(&fsf_req->completion);
 314
 315         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 316                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 317                 retval = FAILED;
 318         } else {
 319                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 320                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 321         }
 322
 323         zfcp_fsf_req_free(fsf_req);
 324         return retval;
 325 }
 326
 327 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 328 {
 329         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 330 }
 331
 332 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 333 {
 334         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 335 }
 336
 337 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 338 {
 339         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 340         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 341         int ret;
 342
 343         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 344         zfcp_erp_wait(adapter);
 345         ret = fc_block_scsi_eh(scpnt);
 346         if (ret)
 347                 return ret;
 348
 349         return SUCCESS;
 350 }
 351
 352 struct scsi_transport_template *zfcp_scsi_transport_template;
 353
 354 static struct scsi_host_template zfcp_scsi_host_template = {
 355         .module                  = THIS_MODULE,
 356         .name                    = "zfcp",
 357         .queuecommand            = zfcp_scsi_queuecommand,
 358         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 359         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 360         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 361         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 362         .slave_alloc             = zfcp_scsi_slave_alloc,
 363         .slave_configure         = zfcp_scsi_slave_configure,
 364         .slave_destroy           = zfcp_scsi_slave_destroy,
 365         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 366         .proc_name               = "zfcp",
 367         .can_queue               = 4096,
 368         .this_id                 = -1,
 369         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 370                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 371                                    /* GCD, adjusted later */
 372         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 373                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 374                                    /* GCD, adjusted later */
 375         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 376         .cmd_per_lun             = 1,
 377         .use_clustering          = 1,
 378         .shost_attrs             = zfcp_sysfs_shost_attrs,
 379         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 380 };
 381
 382 /**
 383  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 384  * @adapter: The zfcp adapter to register with the SCSI midlayer
 385  */
 386 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 387 {
 388         struct ccw_dev_id dev_id;
 389
 390         if (adapter->scsi_host)
 391                 return 0;
 392
 393         ccw_device_get_id(adapter->ccw_device, &dev_id);
 394         /* register adapter as SCSI host with mid layer of SCSI stack */
 395         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 396                                              sizeof (struct zfcp_adapter *));
 397         if (!adapter->scsi_host) {
 398                 dev_err(&adapter->ccw_device->dev,
 399                         "Registering the FCP device with the "
 400                         "SCSI stack failed\n");
 401                 return -EIO;
 402         }
 403
 404         /* tell the SCSI stack some characteristics of this adapter */
 405         adapter->scsi_host->max_id = 511;
 406         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 407         adapter->scsi_host->max_channel = 0;
 408         adapter->scsi_host->unique_id = dev_id.devno;
 409         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 410         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 411
 412         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 413
 414         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 415                 scsi_host_put(adapter->scsi_host);
 416                 return -EIO;
 417         }
 418
 419         return 0;
 420 }
 421
 422 /**
 423  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 424  * @adapter: The zfcp adapter to unregister.
 425  */
 426 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 427 {
 428         struct Scsi_Host *shost;
 429         struct zfcp_port *port;
 430
 431         shost = adapter->scsi_host;
 432         if (!shost)
 433                 return;
 434
 435         read_lock_irq(&adapter->port_list_lock);
 436         list_for_each_entry(port, &adapter->port_list, list)
 437                 port->rport = NULL;
 438         read_unlock_irq(&adapter->port_list_lock);
 439
 440         fc_remove_host(shost);
 441         scsi_remove_host(shost);
 442         scsi_host_put(shost);
 443         adapter->scsi_host = NULL;
 444 }
 445
 446 static struct fc_host_statistics*
 447 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 448 {
 449         struct fc_host_statistics *fc_stats;
 450
 451         if (!adapter->fc_stats) {
 452                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 453                 if (!fc_stats)
 454                         return NULL;
 455                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 456         }
 457         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 458         return adapter->fc_stats;
 459 }
 460
 461 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 462                                       struct fsf_qtcb_bottom_port *data,
 463                                       struct fsf_qtcb_bottom_port *old)
 464 {
 465         fc_stats->seconds_since_last_reset =
 466                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 467         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 468         fc_stats->tx_words = data->tx_words - old->tx_words;
 469         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 470         fc_stats->rx_words = data->rx_words - old->rx_words;
 471         fc_stats->lip_count = data->lip - old->lip;
 472         fc_stats->nos_count = data->nos - old->nos;
 473         fc_stats->error_frames = data->error_frames - old->error_frames;
 474         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 475         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 476         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 477         fc_stats->loss_of_signal_count =
 478                 data->loss_of_signal - old->loss_of_signal;
 479         fc_stats->prim_seq_protocol_err_count =
 480                 data->psp_error_counts - old->psp_error_counts;
 481         fc_stats->invalid_tx_word_count =
 482                 data->invalid_tx_words - old->invalid_tx_words;
 483         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 484         fc_stats->fcp_input_requests =
 485                 data->input_requests - old->input_requests;
 486         fc_stats->fcp_output_requests =
 487                 data->output_requests - old->output_requests;
 488         fc_stats->fcp_control_requests =
 489                 data->control_requests - old->control_requests;
 490         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 491         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 492 }
 493
 494 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 495                                    struct fsf_qtcb_bottom_port *data)
 496 {
 497         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 498         fc_stats->tx_frames = data->tx_frames;
 499         fc_stats->tx_words = data->tx_words;
 500         fc_stats->rx_frames = data->rx_frames;
 501         fc_stats->rx_words = data->rx_words;
 502         fc_stats->lip_count = data->lip;
 503         fc_stats->nos_count = data->nos;
 504         fc_stats->error_frames = data->error_frames;
 505         fc_stats->dumped_frames = data->dumped_frames;
 506         fc_stats->link_failure_count = data->link_failure;
 507         fc_stats->loss_of_sync_count = data->loss_of_sync;
 508         fc_stats->loss_of_signal_count = data->loss_of_signal;
 509         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 510         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 511         fc_stats->invalid_crc_count = data->invalid_crcs;
 512         fc_stats->fcp_input_requests = data->input_requests;
 513         fc_stats->fcp_output_requests = data->output_requests;
 514         fc_stats->fcp_control_requests = data->control_requests;
 515         fc_stats->fcp_input_megabytes = data->input_mb;
 516         fc_stats->fcp_output_megabytes = data->output_mb;
 517 }
 518
 519 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 520 {
 521         struct zfcp_adapter *adapter;
 522         struct fc_host_statistics *fc_stats;
 523         struct fsf_qtcb_bottom_port *data;
 524         int ret;
 525
 526         adapter = (struct zfcp_adapter *)host->hostdata[0];
 527         fc_stats = zfcp_init_fc_host_stats(adapter);
 528         if (!fc_stats)
 529                 return NULL;
 530
 531         data = kzalloc(sizeof(*data), GFP_KERNEL);
 532         if (!data)
 533                 return NULL;
 534
 535         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 536         if (ret) {
 537                 kfree(data);
 538                 return NULL;
 539         }
 540
 541         if (adapter->stats_reset &&
 542             ((jiffies/HZ - adapter->stats_reset) <
 543              data->seconds_since_last_reset))
 544                 zfcp_adjust_fc_host_stats(fc_stats, data,
 545                                           adapter->stats_reset_data);
 546         else
 547                 zfcp_set_fc_host_stats(fc_stats, data);
 548
 549         kfree(data);
 550         return fc_stats;
 551 }
 552
 553 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 554 {
 555         struct zfcp_adapter *adapter;
 556         struct fsf_qtcb_bottom_port *data;
 557         int ret;
 558
 559         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 560         data = kzalloc(sizeof(*data), GFP_KERNEL);
 561         if (!data)
 562                 return;
 563
 564         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 565         if (ret)
 566                 kfree(data);
 567         else {
 568                 adapter->stats_reset = jiffies/HZ;
 569                 kfree(adapter->stats_reset_data);
 570                 adapter->stats_reset_data = data; /* finally freed in
 571                                                      adapter_release */
 572         }
 573 }
 574
 575 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 576 {
 577         struct zfcp_adapter *adapter =
 578                 (struct zfcp_adapter *)shost->hostdata[0];
 579         int status = atomic_read(&adapter->status);
 580
 581         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 582             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 583                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 584         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 585                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 586         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 587                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 588         else
 589                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 590 }
 591
 592 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 593 {
 594         rport->dev_loss_tmo = timeout;
 595 }
 596
 597 /**
 598  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 599  * @rport: The FC rport where to teminate I/O
 600  *
 601  * Abort all pending SCSI commands for a port by closing the
 602  * port. Using a reopen avoids a conflict with a shutdown
 603  * overwriting a reopen. The "forced" ensures that a disappeared port
 604  * is not opened again as valid due to the cached plogi data in
 605  * non-NPIV mode.
 606  */
 607 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 608 {
 609         struct zfcp_port *port;
 610         struct Scsi_Host *shost = rport_to_shost(rport);
 611         struct zfcp_adapter *adapter =
 612                 (struct zfcp_adapter *)shost->hostdata[0];
 613
 614         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 615
 616         if (port) {
 617                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 618                 put_device(&port->dev);
 619         }
 620 }
 621
 622 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 623 {
 624         struct fc_rport_identifiers ids;
 625         struct fc_rport *rport;
 626
 627         if (port->rport)
 628                 return;
 629
 630         ids.node_name = port->wwnn;
 631         ids.port_name = port->wwpn;
 632         ids.port_id = port->d_id;
 633         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 634
 635         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 636                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 637                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 638         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 639         if (!rport) {
 640                 dev_err(&port->adapter->ccw_device->dev,
 641                         "Registering port 0x%016Lx failed\n",
 642                         (unsigned long long)port->wwpn);
 643                 return;
 644         }
 645
 646         rport->maxframe_size = port->maxframe_size;
 647         rport->supported_classes = port->supported_classes;
 648         port->rport = rport;
 649         port->starget_id = rport->scsi_target_id;
 650
 651         zfcp_unit_queue_scsi_scan(port);
 652 }
 653
 654 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 655 {
 656         struct fc_rport *rport = port->rport;
 657
 658         if (rport) {
 659                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 660                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 661                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 662                 fc_remote_port_delete(rport);
 663                 port->rport = NULL;
 664         }
 665 }
 666
 667 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 668 {
 669         get_device(&port->dev);
 670         port->rport_task = RPORT_ADD;
 671
 672         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 673                 put_device(&port->dev);
 674 }
 675
 676 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 677 {
 678         get_device(&port->dev);
 679         port->rport_task = RPORT_DEL;
 680
 681         if (port->rport && queue_work(port->adapter->work_queue,
 682                                       &port->rport_work))
 683                 return;
 684
 685         put_device(&port->dev);
 686 }
 687
 688 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 689 {
 690         unsigned long flags;
 691         struct zfcp_port *port;
 692
 693         read_lock_irqsave(&adapter->port_list_lock, flags);
 694         list_for_each_entry(port, &adapter->port_list, list)
 695                 zfcp_scsi_schedule_rport_block(port);
 696         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 697 }
 698
 699 void zfcp_scsi_rport_work(struct work_struct *work)
 700 {
 701         struct zfcp_port *port = container_of(work, struct zfcp_port,
 702                                               rport_work);
 703
 704         while (port->rport_task) {
 705                 if (port->rport_task == RPORT_ADD) {
 706                         port->rport_task = RPORT_NONE;
 707                         zfcp_scsi_rport_register(port);
 708                 } else {
 709                         port->rport_task = RPORT_NONE;
 710                         zfcp_scsi_rport_block(port);
 711                 }
 712         }
 713
 714         put_device(&port->dev);
 715 }
 716
 717 /**
 718  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 719  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 720  */
 721 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 722 {
 723         unsigned int mask = 0;
 724         unsigned int data_div;
 725         struct Scsi_Host *shost = adapter->scsi_host;
 726
 727         data_div = atomic_read(&adapter->status) &
 728                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 729
 730         if (enable_dif &&
 731             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 732                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 733
 734         if (enable_dif && data_div &&
 735             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 736                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 737                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 738                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 739                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 740                 shost->max_sectors = shost->sg_tablesize * 8;
 741         }
 742
 743         scsi_host_set_prot(shost, mask);
 744 }
 745
 746 /**
 747  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 748  * @scmd: The SCSI command to report the error for
 749  * @ascq: The ASCQ to put in the sense buffer
 750  *
 751  * See the error handling in sd_done for the sense codes used here.
 752  * Set DID_SOFT_ERROR to retry the request, if possible.
 753  */
 754 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 755 {
 756         scsi_build_sense_buffer(1, scmd->sense_buffer,
 757                                 ILLEGAL_REQUEST, 0x10, ascq);
 758         set_driver_byte(scmd, DRIVER_SENSE);
 759         scmd->result |= SAM_STAT_CHECK_CONDITION;
 760         set_host_byte(scmd, DID_SOFT_ERROR);
 761 }
 762
 763 struct fc_function_template zfcp_transport_functions = {
 764         .show_starget_port_id = 1,
 765         .show_starget_port_name = 1,
 766         .show_starget_node_name = 1,
 767         .show_rport_supported_classes = 1,
 768         .show_rport_maxframe_size = 1,
 769         .show_rport_dev_loss_tmo = 1,
 770         .show_host_node_name = 1,
 771         .show_host_port_name = 1,
 772         .show_host_permanent_port_name = 1,
 773         .show_host_supported_classes = 1,
 774         .show_host_supported_fc4s = 1,
 775         .show_host_supported_speeds = 1,
 776         .show_host_maxframe_size = 1,
 777         .show_host_serial_number = 1,
 778         .get_fc_host_stats = zfcp_get_fc_host_stats,
 779         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 780         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 781         .get_host_port_state = zfcp_get_host_port_state,
 782         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 783         .show_host_port_state = 1,
 784         .show_host_active_fc4s = 1,
 785         .bsg_request = zfcp_fc_exec_bsg_job,
 786         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 787         /* no functions registered for following dynamic attributes but
 788            directly set by LLDD */
 789         .show_host_port_type = 1,
 790         .show_host_symbolic_name = 1,
 791         .show_host_speed = 1,
 792         .show_host_port_id = 1,
 793         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 794 };