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 either
 113                  * open LUN pending: this is temporary, will result in
 114                  *      open LUN or ERP_FAILED, so retry command
 115                  * call to rport_delete pending: mimic retry from
 116                  *      fc_remote_port_chkready until rport is BLOCKED
 117                  */
 118                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 119                 return 0;
 120         }
 121
 122         ret = zfcp_fsf_fcp_cmnd(scpnt);
 123         if (unlikely(ret == -EBUSY))
 124                 return SCSI_MLQUEUE_DEVICE_BUSY;
 125         else if (unlikely(ret < 0))
 126                 return SCSI_MLQUEUE_HOST_BUSY;
 127
 128         return ret;
 129 }
 130
 131 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 132 {
 133         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 134         struct zfcp_adapter *adapter =
 135                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 136         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 137         struct zfcp_port *port;
 138         struct zfcp_unit *unit;
 139         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 140
 141         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 142         if (!port)
 143                 return -ENXIO;
 144
 145         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 146         if (unit)
 147                 put_device(&unit->dev);
 148
 149         if (!unit && !(allow_lun_scan && npiv)) {
 150                 put_device(&port->dev);
 151                 return -ENXIO;
 152         }
 153
 154         zfcp_sdev->port = port;
 155         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 157         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 158         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 159         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 160         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 161         spin_lock_init(&zfcp_sdev->latencies.lock);
 162
 163         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 164         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 165         zfcp_erp_wait(port->adapter);
 166
 167         return 0;
 168 }
 169
 170 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 171 {
 172         struct Scsi_Host *scsi_host = scpnt->device->host;
 173         struct zfcp_adapter *adapter =
 174                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 175         struct zfcp_fsf_req *old_req, *abrt_req;
 176         unsigned long flags;
 177         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 178         int retval = SUCCESS, ret;
 179         int retry = 3;
 180         char *dbf_tag;
 181
 182         /* avoid race condition between late normal completion and abort */
 183         write_lock_irqsave(&adapter->abort_lock, flags);
 184
 185         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 186         if (!old_req) {
 187                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 188                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 189                 return FAILED; /* completion could be in progress */
 190         }
 191         old_req->data = NULL;
 192
 193         /* don't access old fsf_req after releasing the abort_lock */
 194         write_unlock_irqrestore(&adapter->abort_lock, flags);
 195
 196         while (retry--) {
 197                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 198                 if (abrt_req)
 199                         break;
 200
 201                 zfcp_erp_wait(adapter);
 202                 ret = fc_block_scsi_eh(scpnt);
 203                 if (ret) {
 204                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 205                         return ret;
 206                 }
 207                 if (!(atomic_read(&adapter->status) &
 208                       ZFCP_STATUS_COMMON_RUNNING)) {
 209                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 210                         return SUCCESS;
 211                 }
 212         }
 213         if (!abrt_req) {
 214                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 215                 return FAILED;
 216         }
 217
 218         wait_for_completion(&abrt_req->completion);
 219
 220         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 221                 dbf_tag = "abrt_ok";
 222         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 223                 dbf_tag = "abrt_nn";
 224         else {
 225                 dbf_tag = "abrt_fa";
 226                 retval = FAILED;
 227         }
 228         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 229         zfcp_fsf_req_free(abrt_req);
 230         return retval;
 231 }
 232
 233 struct zfcp_scsi_req_filter {
 234         u8 tmf_scope;
 235         u32 lun_handle;
 236         u32 port_handle;
 237 };
 238
 239 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 240 {
 241         struct zfcp_scsi_req_filter *filter =
 242                 (struct zfcp_scsi_req_filter *)data;
 243
 244         /* already aborted - prevent side-effects - or not a SCSI command */
 245         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 246                 return;
 247
 248         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 249         if (old_req->qtcb->header.port_handle != filter->port_handle)
 250                 return;
 251
 252         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 253             old_req->qtcb->header.lun_handle != filter->lun_handle)
 254                 return;
 255
 256         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 257         old_req->data = NULL;
 258 }
 259
 260 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 261 {
 262         struct zfcp_adapter *adapter = zsdev->port->adapter;
 263         struct zfcp_scsi_req_filter filter = {
 264                 .tmf_scope = FCP_TMF_TGT_RESET,
 265                 .port_handle = zsdev->port->handle,
 266         };
 267         unsigned long flags;
 268
 269         if (tm_flags == FCP_TMF_LUN_RESET) {
 270                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 271                 filter.lun_handle = zsdev->lun_handle;
 272         }
 273
 274         /*
 275          * abort_lock secures against other processings - in the abort-function
 276          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 277          */
 278         write_lock_irqsave(&adapter->abort_lock, flags);
 279         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 280                                    &filter);
 281         write_unlock_irqrestore(&adapter->abort_lock, flags);
 282 }
 283
 284 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 285 {
 286         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 287         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 288         struct zfcp_fsf_req *fsf_req = NULL;
 289         int retval = SUCCESS, ret;
 290         int retry = 3;
 291
 292         while (retry--) {
 293                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 294                 if (fsf_req)
 295                         break;
 296
 297                 zfcp_erp_wait(adapter);
 298                 ret = fc_block_scsi_eh(scpnt);
 299                 if (ret)
 300                         return ret;
 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                 return FAILED;
 310
 311         wait_for_completion(&fsf_req->completion);
 312
 313         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 314                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 315                 retval = FAILED;
 316         } else {
 317                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 318                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 319         }
 320
 321         zfcp_fsf_req_free(fsf_req);
 322         return retval;
 323 }
 324
 325 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 326 {
 327         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 328 }
 329
 330 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 331 {
 332         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 333 }
 334
 335 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 336 {
 337         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 338         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 339         int ret;
 340
 341         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 342         zfcp_erp_wait(adapter);
 343         ret = fc_block_scsi_eh(scpnt);
 344         if (ret)
 345                 return ret;
 346
 347         return SUCCESS;
 348 }
 349
 350 struct scsi_transport_template *zfcp_scsi_transport_template;
 351
 352 static struct scsi_host_template zfcp_scsi_host_template = {
 353         .module                  = THIS_MODULE,
 354         .name                    = "zfcp",
 355         .queuecommand            = zfcp_scsi_queuecommand,
 356         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 357         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 358         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 359         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 360         .slave_alloc             = zfcp_scsi_slave_alloc,
 361         .slave_configure         = zfcp_scsi_slave_configure,
 362         .slave_destroy           = zfcp_scsi_slave_destroy,
 363         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 364         .proc_name               = "zfcp",
 365         .can_queue               = 4096,
 366         .this_id                 = -1,
 367         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 368                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 369                                    /* GCD, adjusted later */
 370         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 371                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 372                                    /* GCD, adjusted later */
 373         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 374         .cmd_per_lun             = 1,
 375         .use_clustering          = 1,
 376         .shost_attrs             = zfcp_sysfs_shost_attrs,
 377         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 378 };
 379
 380 /**
 381  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 382  * @adapter: The zfcp adapter to register with the SCSI midlayer
 383  */
 384 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 385 {
 386         struct ccw_dev_id dev_id;
 387
 388         if (adapter->scsi_host)
 389                 return 0;
 390
 391         ccw_device_get_id(adapter->ccw_device, &dev_id);
 392         /* register adapter as SCSI host with mid layer of SCSI stack */
 393         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 394                                              sizeof (struct zfcp_adapter *));
 395         if (!adapter->scsi_host) {
 396                 dev_err(&adapter->ccw_device->dev,
 397                         "Registering the FCP device with the "
 398                         "SCSI stack failed\n");
 399                 return -EIO;
 400         }
 401
 402         /* tell the SCSI stack some characteristics of this adapter */
 403         adapter->scsi_host->max_id = 511;
 404         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 405         adapter->scsi_host->max_channel = 0;
 406         adapter->scsi_host->unique_id = dev_id.devno;
 407         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 408         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 409
 410         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 411
 412         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 413                 scsi_host_put(adapter->scsi_host);
 414                 return -EIO;
 415         }
 416
 417         return 0;
 418 }
 419
 420 /**
 421  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 422  * @adapter: The zfcp adapter to unregister.
 423  */
 424 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 425 {
 426         struct Scsi_Host *shost;
 427         struct zfcp_port *port;
 428
 429         shost = adapter->scsi_host;
 430         if (!shost)
 431                 return;
 432
 433         read_lock_irq(&adapter->port_list_lock);
 434         list_for_each_entry(port, &adapter->port_list, list)
 435                 port->rport = NULL;
 436         read_unlock_irq(&adapter->port_list_lock);
 437
 438         fc_remove_host(shost);
 439         scsi_remove_host(shost);
 440         scsi_host_put(shost);
 441         adapter->scsi_host = NULL;
 442 }
 443
 444 static struct fc_host_statistics*
 445 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 446 {
 447         struct fc_host_statistics *fc_stats;
 448
 449         if (!adapter->fc_stats) {
 450                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 451                 if (!fc_stats)
 452                         return NULL;
 453                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 454         }
 455         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 456         return adapter->fc_stats;
 457 }
 458
 459 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 460                                       struct fsf_qtcb_bottom_port *data,
 461                                       struct fsf_qtcb_bottom_port *old)
 462 {
 463         fc_stats->seconds_since_last_reset =
 464                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 465         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 466         fc_stats->tx_words = data->tx_words - old->tx_words;
 467         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 468         fc_stats->rx_words = data->rx_words - old->rx_words;
 469         fc_stats->lip_count = data->lip - old->lip;
 470         fc_stats->nos_count = data->nos - old->nos;
 471         fc_stats->error_frames = data->error_frames - old->error_frames;
 472         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 473         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 474         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 475         fc_stats->loss_of_signal_count =
 476                 data->loss_of_signal - old->loss_of_signal;
 477         fc_stats->prim_seq_protocol_err_count =
 478                 data->psp_error_counts - old->psp_error_counts;
 479         fc_stats->invalid_tx_word_count =
 480                 data->invalid_tx_words - old->invalid_tx_words;
 481         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 482         fc_stats->fcp_input_requests =
 483                 data->input_requests - old->input_requests;
 484         fc_stats->fcp_output_requests =
 485                 data->output_requests - old->output_requests;
 486         fc_stats->fcp_control_requests =
 487                 data->control_requests - old->control_requests;
 488         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 489         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 490 }
 491
 492 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 493                                    struct fsf_qtcb_bottom_port *data)
 494 {
 495         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 496         fc_stats->tx_frames = data->tx_frames;
 497         fc_stats->tx_words = data->tx_words;
 498         fc_stats->rx_frames = data->rx_frames;
 499         fc_stats->rx_words = data->rx_words;
 500         fc_stats->lip_count = data->lip;
 501         fc_stats->nos_count = data->nos;
 502         fc_stats->error_frames = data->error_frames;
 503         fc_stats->dumped_frames = data->dumped_frames;
 504         fc_stats->link_failure_count = data->link_failure;
 505         fc_stats->loss_of_sync_count = data->loss_of_sync;
 506         fc_stats->loss_of_signal_count = data->loss_of_signal;
 507         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 508         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 509         fc_stats->invalid_crc_count = data->invalid_crcs;
 510         fc_stats->fcp_input_requests = data->input_requests;
 511         fc_stats->fcp_output_requests = data->output_requests;
 512         fc_stats->fcp_control_requests = data->control_requests;
 513         fc_stats->fcp_input_megabytes = data->input_mb;
 514         fc_stats->fcp_output_megabytes = data->output_mb;
 515 }
 516
 517 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 518 {
 519         struct zfcp_adapter *adapter;
 520         struct fc_host_statistics *fc_stats;
 521         struct fsf_qtcb_bottom_port *data;
 522         int ret;
 523
 524         adapter = (struct zfcp_adapter *)host->hostdata[0];
 525         fc_stats = zfcp_init_fc_host_stats(adapter);
 526         if (!fc_stats)
 527                 return NULL;
 528
 529         data = kzalloc(sizeof(*data), GFP_KERNEL);
 530         if (!data)
 531                 return NULL;
 532
 533         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 534         if (ret) {
 535                 kfree(data);
 536                 return NULL;
 537         }
 538
 539         if (adapter->stats_reset &&
 540             ((jiffies/HZ - adapter->stats_reset) <
 541              data->seconds_since_last_reset))
 542                 zfcp_adjust_fc_host_stats(fc_stats, data,
 543                                           adapter->stats_reset_data);
 544         else
 545                 zfcp_set_fc_host_stats(fc_stats, data);
 546
 547         kfree(data);
 548         return fc_stats;
 549 }
 550
 551 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 552 {
 553         struct zfcp_adapter *adapter;
 554         struct fsf_qtcb_bottom_port *data;
 555         int ret;
 556
 557         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 558         data = kzalloc(sizeof(*data), GFP_KERNEL);
 559         if (!data)
 560                 return;
 561
 562         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 563         if (ret)
 564                 kfree(data);
 565         else {
 566                 adapter->stats_reset = jiffies/HZ;
 567                 kfree(adapter->stats_reset_data);
 568                 adapter->stats_reset_data = data; /* finally freed in
 569                                                      adapter_release */
 570         }
 571 }
 572
 573 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 574 {
 575         struct zfcp_adapter *adapter =
 576                 (struct zfcp_adapter *)shost->hostdata[0];
 577         int status = atomic_read(&adapter->status);
 578
 579         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 580             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 581                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 582         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 583                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 584         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 585                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 586         else
 587                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 588 }
 589
 590 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 591 {
 592         rport->dev_loss_tmo = timeout;
 593 }
 594
 595 /**
 596  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 597  * @rport: The FC rport where to teminate I/O
 598  *
 599  * Abort all pending SCSI commands for a port by closing the
 600  * port. Using a reopen avoids a conflict with a shutdown
 601  * overwriting a reopen. The "forced" ensures that a disappeared port
 602  * is not opened again as valid due to the cached plogi data in
 603  * non-NPIV mode.
 604  */
 605 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 606 {
 607         struct zfcp_port *port;
 608         struct Scsi_Host *shost = rport_to_shost(rport);
 609         struct zfcp_adapter *adapter =
 610                 (struct zfcp_adapter *)shost->hostdata[0];
 611
 612         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 613
 614         if (port) {
 615                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 616                 put_device(&port->dev);
 617         }
 618 }
 619
 620 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 621 {
 622         struct fc_rport_identifiers ids;
 623         struct fc_rport *rport;
 624
 625         if (port->rport)
 626                 return;
 627
 628         ids.node_name = port->wwnn;
 629         ids.port_name = port->wwpn;
 630         ids.port_id = port->d_id;
 631         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 632
 633         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 634                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 635                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 636         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 637         if (!rport) {
 638                 dev_err(&port->adapter->ccw_device->dev,
 639                         "Registering port 0x%016Lx failed\n",
 640                         (unsigned long long)port->wwpn);
 641                 return;
 642         }
 643
 644         rport->maxframe_size = port->maxframe_size;
 645         rport->supported_classes = port->supported_classes;
 646         port->rport = rport;
 647         port->starget_id = rport->scsi_target_id;
 648
 649         zfcp_unit_queue_scsi_scan(port);
 650 }
 651
 652 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 653 {
 654         struct fc_rport *rport = port->rport;
 655
 656         if (rport) {
 657                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 658                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 659                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 660                 fc_remote_port_delete(rport);
 661                 port->rport = NULL;
 662         }
 663 }
 664
 665 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 666 {
 667         get_device(&port->dev);
 668         port->rport_task = RPORT_ADD;
 669
 670         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 671                 put_device(&port->dev);
 672 }
 673
 674 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 675 {
 676         get_device(&port->dev);
 677         port->rport_task = RPORT_DEL;
 678
 679         if (port->rport && queue_work(port->adapter->work_queue,
 680                                       &port->rport_work))
 681                 return;
 682
 683         put_device(&port->dev);
 684 }
 685
 686 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 687 {
 688         unsigned long flags;
 689         struct zfcp_port *port;
 690
 691         read_lock_irqsave(&adapter->port_list_lock, flags);
 692         list_for_each_entry(port, &adapter->port_list, list)
 693                 zfcp_scsi_schedule_rport_block(port);
 694         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 695 }
 696
 697 void zfcp_scsi_rport_work(struct work_struct *work)
 698 {
 699         struct zfcp_port *port = container_of(work, struct zfcp_port,
 700                                               rport_work);
 701
 702         while (port->rport_task) {
 703                 if (port->rport_task == RPORT_ADD) {
 704                         port->rport_task = RPORT_NONE;
 705                         zfcp_scsi_rport_register(port);
 706                 } else {
 707                         port->rport_task = RPORT_NONE;
 708                         zfcp_scsi_rport_block(port);
 709                 }
 710         }
 711
 712         put_device(&port->dev);
 713 }
 714
 715 /**
 716  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 717  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 718  */
 719 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 720 {
 721         unsigned int mask = 0;
 722         unsigned int data_div;
 723         struct Scsi_Host *shost = adapter->scsi_host;
 724
 725         data_div = atomic_read(&adapter->status) &
 726                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 727
 728         if (enable_dif &&
 729             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 730                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 731
 732         if (enable_dif && data_div &&
 733             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 734                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 735                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 736                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 737                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 738                 shost->max_sectors = shost->sg_tablesize * 8;
 739         }
 740
 741         scsi_host_set_prot(shost, mask);
 742 }
 743
 744 /**
 745  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 746  * @scmd: The SCSI command to report the error for
 747  * @ascq: The ASCQ to put in the sense buffer
 748  *
 749  * See the error handling in sd_done for the sense codes used here.
 750  * Set DID_SOFT_ERROR to retry the request, if possible.
 751  */
 752 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 753 {
 754         scsi_build_sense_buffer(1, scmd->sense_buffer,
 755                                 ILLEGAL_REQUEST, 0x10, ascq);
 756         set_driver_byte(scmd, DRIVER_SENSE);
 757         scmd->result |= SAM_STAT_CHECK_CONDITION;
 758         set_host_byte(scmd, DID_SOFT_ERROR);
 759 }
 760
 761 struct fc_function_template zfcp_transport_functions = {
 762         .show_starget_port_id = 1,
 763         .show_starget_port_name = 1,
 764         .show_starget_node_name = 1,
 765         .show_rport_supported_classes = 1,
 766         .show_rport_maxframe_size = 1,
 767         .show_rport_dev_loss_tmo = 1,
 768         .show_host_node_name = 1,
 769         .show_host_port_name = 1,
 770         .show_host_permanent_port_name = 1,
 771         .show_host_supported_classes = 1,
 772         .show_host_supported_fc4s = 1,
 773         .show_host_supported_speeds = 1,
 774         .show_host_maxframe_size = 1,
 775         .show_host_serial_number = 1,
 776         .get_fc_host_stats = zfcp_get_fc_host_stats,
 777         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 778         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 779         .get_host_port_state = zfcp_get_host_port_state,
 780         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 781         .show_host_port_state = 1,
 782         .show_host_active_fc4s = 1,
 783         .bsg_request = zfcp_fc_exec_bsg_job,
 784         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 785         /* no functions registered for following dynamic attributes but
 786            directly set by LLDD */
 787         .show_host_port_type = 1,
 788         .show_host_symbolic_name = 1,
 789         .show_host_speed = 1,
 790         .show_host_port_id = 1,
 791         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 792 };