drivers/s390/scsi/zfcp_scsi.c

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