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                         return ret;
 299
 300                 if (!(atomic_read(&adapter->status) &
 301                       ZFCP_STATUS_COMMON_RUNNING)) {
 302                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 303                         return SUCCESS;
 304                 }
 305         }
 306         if (!fsf_req)
 307                 return FAILED;
 308
 309         wait_for_completion(&fsf_req->completion);
 310
 311         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 312                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 313                 retval = FAILED;
 314         } else {
 315                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 316                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 317         }
 318
 319         zfcp_fsf_req_free(fsf_req);
 320         return retval;
 321 }
 322
 323 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 324 {
 325         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 326 }
 327
 328 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 329 {
 330         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 331 }
 332
 333 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 334 {
 335         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 336         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 337         int ret;
 338
 339         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 340         zfcp_erp_wait(adapter);
 341         ret = fc_block_scsi_eh(scpnt);
 342         if (ret)
 343                 return ret;
 344
 345         return SUCCESS;
 346 }
 347
 348 struct scsi_transport_template *zfcp_scsi_transport_template;
 349
 350 static struct scsi_host_template zfcp_scsi_host_template = {
 351         .module                  = THIS_MODULE,
 352         .name                    = "zfcp",
 353         .queuecommand            = zfcp_scsi_queuecommand,
 354         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 355         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 356         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 357         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 358         .slave_alloc             = zfcp_scsi_slave_alloc,
 359         .slave_configure         = zfcp_scsi_slave_configure,
 360         .slave_destroy           = zfcp_scsi_slave_destroy,
 361         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 362         .proc_name               = "zfcp",
 363         .can_queue               = 4096,
 364         .this_id                 = -1,
 365         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 366                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 367                                    /* GCD, adjusted later */
 368         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 369                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 370                                    /* GCD, adjusted later */
 371         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 372         .cmd_per_lun             = 1,
 373         .use_clustering          = 1,
 374         .shost_attrs             = zfcp_sysfs_shost_attrs,
 375         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 376 };
 377
 378 /**
 379  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 380  * @adapter: The zfcp adapter to register with the SCSI midlayer
 381  */
 382 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 383 {
 384         struct ccw_dev_id dev_id;
 385
 386         if (adapter->scsi_host)
 387                 return 0;
 388
 389         ccw_device_get_id(adapter->ccw_device, &dev_id);
 390         /* register adapter as SCSI host with mid layer of SCSI stack */
 391         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 392                                              sizeof (struct zfcp_adapter *));
 393         if (!adapter->scsi_host) {
 394                 dev_err(&adapter->ccw_device->dev,
 395                         "Registering the FCP device with the "
 396                         "SCSI stack failed\n");
 397                 return -EIO;
 398         }
 399
 400         /* tell the SCSI stack some characteristics of this adapter */
 401         adapter->scsi_host->max_id = 511;
 402         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 403         adapter->scsi_host->max_channel = 0;
 404         adapter->scsi_host->unique_id = dev_id.devno;
 405         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 406         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 407
 408         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 409
 410         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 411                 scsi_host_put(adapter->scsi_host);
 412                 return -EIO;
 413         }
 414
 415         return 0;
 416 }
 417
 418 /**
 419  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 420  * @adapter: The zfcp adapter to unregister.
 421  */
 422 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 423 {
 424         struct Scsi_Host *shost;
 425         struct zfcp_port *port;
 426
 427         shost = adapter->scsi_host;
 428         if (!shost)
 429                 return;
 430
 431         read_lock_irq(&adapter->port_list_lock);
 432         list_for_each_entry(port, &adapter->port_list, list)
 433                 port->rport = NULL;
 434         read_unlock_irq(&adapter->port_list_lock);
 435
 436         fc_remove_host(shost);
 437         scsi_remove_host(shost);
 438         scsi_host_put(shost);
 439         adapter->scsi_host = NULL;
 440 }
 441
 442 static struct fc_host_statistics*
 443 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 444 {
 445         struct fc_host_statistics *fc_stats;
 446
 447         if (!adapter->fc_stats) {
 448                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 449                 if (!fc_stats)
 450                         return NULL;
 451                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 452         }
 453         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 454         return adapter->fc_stats;
 455 }
 456
 457 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 458                                       struct fsf_qtcb_bottom_port *data,
 459                                       struct fsf_qtcb_bottom_port *old)
 460 {
 461         fc_stats->seconds_since_last_reset =
 462                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 463         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 464         fc_stats->tx_words = data->tx_words - old->tx_words;
 465         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 466         fc_stats->rx_words = data->rx_words - old->rx_words;
 467         fc_stats->lip_count = data->lip - old->lip;
 468         fc_stats->nos_count = data->nos - old->nos;
 469         fc_stats->error_frames = data->error_frames - old->error_frames;
 470         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 471         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 472         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 473         fc_stats->loss_of_signal_count =
 474                 data->loss_of_signal - old->loss_of_signal;
 475         fc_stats->prim_seq_protocol_err_count =
 476                 data->psp_error_counts - old->psp_error_counts;
 477         fc_stats->invalid_tx_word_count =
 478                 data->invalid_tx_words - old->invalid_tx_words;
 479         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 480         fc_stats->fcp_input_requests =
 481                 data->input_requests - old->input_requests;
 482         fc_stats->fcp_output_requests =
 483                 data->output_requests - old->output_requests;
 484         fc_stats->fcp_control_requests =
 485                 data->control_requests - old->control_requests;
 486         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 487         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 488 }
 489
 490 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 491                                    struct fsf_qtcb_bottom_port *data)
 492 {
 493         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 494         fc_stats->tx_frames = data->tx_frames;
 495         fc_stats->tx_words = data->tx_words;
 496         fc_stats->rx_frames = data->rx_frames;
 497         fc_stats->rx_words = data->rx_words;
 498         fc_stats->lip_count = data->lip;
 499         fc_stats->nos_count = data->nos;
 500         fc_stats->error_frames = data->error_frames;
 501         fc_stats->dumped_frames = data->dumped_frames;
 502         fc_stats->link_failure_count = data->link_failure;
 503         fc_stats->loss_of_sync_count = data->loss_of_sync;
 504         fc_stats->loss_of_signal_count = data->loss_of_signal;
 505         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 506         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 507         fc_stats->invalid_crc_count = data->invalid_crcs;
 508         fc_stats->fcp_input_requests = data->input_requests;
 509         fc_stats->fcp_output_requests = data->output_requests;
 510         fc_stats->fcp_control_requests = data->control_requests;
 511         fc_stats->fcp_input_megabytes = data->input_mb;
 512         fc_stats->fcp_output_megabytes = data->output_mb;
 513 }
 514
 515 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 516 {
 517         struct zfcp_adapter *adapter;
 518         struct fc_host_statistics *fc_stats;
 519         struct fsf_qtcb_bottom_port *data;
 520         int ret;
 521
 522         adapter = (struct zfcp_adapter *)host->hostdata[0];
 523         fc_stats = zfcp_init_fc_host_stats(adapter);
 524         if (!fc_stats)
 525                 return NULL;
 526
 527         data = kzalloc(sizeof(*data), GFP_KERNEL);
 528         if (!data)
 529                 return NULL;
 530
 531         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 532         if (ret) {
 533                 kfree(data);
 534                 return NULL;
 535         }
 536
 537         if (adapter->stats_reset &&
 538             ((jiffies/HZ - adapter->stats_reset) <
 539              data->seconds_since_last_reset))
 540                 zfcp_adjust_fc_host_stats(fc_stats, data,
 541                                           adapter->stats_reset_data);
 542         else
 543                 zfcp_set_fc_host_stats(fc_stats, data);
 544
 545         kfree(data);
 546         return fc_stats;
 547 }
 548
 549 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 550 {
 551         struct zfcp_adapter *adapter;
 552         struct fsf_qtcb_bottom_port *data;
 553         int ret;
 554
 555         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 556         data = kzalloc(sizeof(*data), GFP_KERNEL);
 557         if (!data)
 558                 return;
 559
 560         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 561         if (ret)
 562                 kfree(data);
 563         else {
 564                 adapter->stats_reset = jiffies/HZ;
 565                 kfree(adapter->stats_reset_data);
 566                 adapter->stats_reset_data = data; /* finally freed in
 567                                                      adapter_release */
 568         }
 569 }
 570
 571 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 572 {
 573         struct zfcp_adapter *adapter =
 574                 (struct zfcp_adapter *)shost->hostdata[0];
 575         int status = atomic_read(&adapter->status);
 576
 577         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 578             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 579                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 580         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 581                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 582         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 583                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 584         else
 585                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 586 }
 587
 588 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 589 {
 590         rport->dev_loss_tmo = timeout;
 591 }
 592
 593 /**
 594  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 595  * @rport: The FC rport where to teminate I/O
 596  *
 597  * Abort all pending SCSI commands for a port by closing the
 598  * port. Using a reopen avoids a conflict with a shutdown
 599  * overwriting a reopen. The "forced" ensures that a disappeared port
 600  * is not opened again as valid due to the cached plogi data in
 601  * non-NPIV mode.
 602  */
 603 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 604 {
 605         struct zfcp_port *port;
 606         struct Scsi_Host *shost = rport_to_shost(rport);
 607         struct zfcp_adapter *adapter =
 608                 (struct zfcp_adapter *)shost->hostdata[0];
 609
 610         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 611
 612         if (port) {
 613                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 614                 put_device(&port->dev);
 615         }
 616 }
 617
 618 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 619 {
 620         struct fc_rport_identifiers ids;
 621         struct fc_rport *rport;
 622
 623         if (port->rport)
 624                 return;
 625
 626         ids.node_name = port->wwnn;
 627         ids.port_name = port->wwpn;
 628         ids.port_id = port->d_id;
 629         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 630
 631         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 632                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 633                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 634         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 635         if (!rport) {
 636                 dev_err(&port->adapter->ccw_device->dev,
 637                         "Registering port 0x%016Lx failed\n",
 638                         (unsigned long long)port->wwpn);
 639                 return;
 640         }
 641
 642         rport->maxframe_size = port->maxframe_size;
 643         rport->supported_classes = port->supported_classes;
 644         port->rport = rport;
 645         port->starget_id = rport->scsi_target_id;
 646
 647         zfcp_unit_queue_scsi_scan(port);
 648 }
 649
 650 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 651 {
 652         struct fc_rport *rport = port->rport;
 653
 654         if (rport) {
 655                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 656                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 657                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 658                 fc_remote_port_delete(rport);
 659                 port->rport = NULL;
 660         }
 661 }
 662
 663 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 664 {
 665         get_device(&port->dev);
 666         port->rport_task = RPORT_ADD;
 667
 668         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 669                 put_device(&port->dev);
 670 }
 671
 672 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 673 {
 674         get_device(&port->dev);
 675         port->rport_task = RPORT_DEL;
 676
 677         if (port->rport && queue_work(port->adapter->work_queue,
 678                                       &port->rport_work))
 679                 return;
 680
 681         put_device(&port->dev);
 682 }
 683
 684 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 685 {
 686         unsigned long flags;
 687         struct zfcp_port *port;
 688
 689         read_lock_irqsave(&adapter->port_list_lock, flags);
 690         list_for_each_entry(port, &adapter->port_list, list)
 691                 zfcp_scsi_schedule_rport_block(port);
 692         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 693 }
 694
 695 void zfcp_scsi_rport_work(struct work_struct *work)
 696 {
 697         struct zfcp_port *port = container_of(work, struct zfcp_port,
 698                                               rport_work);
 699
 700         while (port->rport_task) {
 701                 if (port->rport_task == RPORT_ADD) {
 702                         port->rport_task = RPORT_NONE;
 703                         zfcp_scsi_rport_register(port);
 704                 } else {
 705                         port->rport_task = RPORT_NONE;
 706                         zfcp_scsi_rport_block(port);
 707                 }
 708         }
 709
 710         put_device(&port->dev);
 711 }
 712
 713 /**
 714  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 715  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 716  */
 717 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 718 {
 719         unsigned int mask = 0;
 720         unsigned int data_div;
 721         struct Scsi_Host *shost = adapter->scsi_host;
 722
 723         data_div = atomic_read(&adapter->status) &
 724                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 725
 726         if (enable_dif &&
 727             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 728                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 729
 730         if (enable_dif && data_div &&
 731             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 732                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 733                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 734                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 735                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 736                 shost->max_sectors = shost->sg_tablesize * 8;
 737         }
 738
 739         scsi_host_set_prot(shost, mask);
 740 }
 741
 742 /**
 743  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 744  * @scmd: The SCSI command to report the error for
 745  * @ascq: The ASCQ to put in the sense buffer
 746  *
 747  * See the error handling in sd_done for the sense codes used here.
 748  * Set DID_SOFT_ERROR to retry the request, if possible.
 749  */
 750 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 751 {
 752         scsi_build_sense_buffer(1, scmd->sense_buffer,
 753                                 ILLEGAL_REQUEST, 0x10, ascq);
 754         set_driver_byte(scmd, DRIVER_SENSE);
 755         scmd->result |= SAM_STAT_CHECK_CONDITION;
 756         set_host_byte(scmd, DID_SOFT_ERROR);
 757 }
 758
 759 struct fc_function_template zfcp_transport_functions = {
 760         .show_starget_port_id = 1,
 761         .show_starget_port_name = 1,
 762         .show_starget_node_name = 1,
 763         .show_rport_supported_classes = 1,
 764         .show_rport_maxframe_size = 1,
 765         .show_rport_dev_loss_tmo = 1,
 766         .show_host_node_name = 1,
 767         .show_host_port_name = 1,
 768         .show_host_permanent_port_name = 1,
 769         .show_host_supported_classes = 1,
 770         .show_host_supported_fc4s = 1,
 771         .show_host_supported_speeds = 1,
 772         .show_host_maxframe_size = 1,
 773         .show_host_serial_number = 1,
 774         .get_fc_host_stats = zfcp_get_fc_host_stats,
 775         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 776         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 777         .get_host_port_state = zfcp_get_host_port_state,
 778         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 779         .show_host_port_state = 1,
 780         .show_host_active_fc4s = 1,
 781         .bsg_request = zfcp_fc_exec_bsg_job,
 782         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 783         /* no functions registered for following dynamic attributes but
 784            directly set by LLDD */
 785         .show_host_port_type = 1,
 786         .show_host_symbolic_name = 1,
 787         .show_host_speed = 1,
 788         .show_host_port_id = 1,
 789         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 790 };