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 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                         return ret;
 278
 279                 if (!(atomic_read(&adapter->status) &
 280                       ZFCP_STATUS_COMMON_RUNNING)) {
 281                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 282                         return SUCCESS;
 283                 }
 284         }
 285         if (!fsf_req)
 286                 return FAILED;
 287
 288         wait_for_completion(&fsf_req->completion);
 289
 290         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 291                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 292                 retval = FAILED;
 293         } else {
 294                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 295                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 296         }
 297
 298         zfcp_fsf_req_free(fsf_req);
 299         return retval;
 300 }
 301
 302 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 303 {
 304         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 305 }
 306
 307 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 308 {
 309         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 310 }
 311
 312 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 313 {
 314         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 315         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 316         int ret;
 317
 318         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 319         zfcp_erp_wait(adapter);
 320         ret = fc_block_scsi_eh(scpnt);
 321         if (ret)
 322                 return ret;
 323
 324         return SUCCESS;
 325 }
 326
 327 struct scsi_transport_template *zfcp_scsi_transport_template;
 328
 329 static struct scsi_host_template zfcp_scsi_host_template = {
 330         .module                  = THIS_MODULE,
 331         .name                    = "zfcp",
 332         .queuecommand            = zfcp_scsi_queuecommand,
 333         .eh_timed_out            = fc_eh_timed_out,
 334         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 335         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 336         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 337         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 338         .slave_alloc             = zfcp_scsi_slave_alloc,
 339         .slave_configure         = zfcp_scsi_slave_configure,
 340         .slave_destroy           = zfcp_scsi_slave_destroy,
 341         .change_queue_depth      = scsi_change_queue_depth,
 342         .proc_name               = "zfcp",
 343         .can_queue               = 4096,
 344         .this_id                 = -1,
 345         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 346                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 347                                    /* GCD, adjusted later */
 348         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 349                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 350                                    /* GCD, adjusted later */
 351         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 352         .use_clustering          = 1,
 353         .shost_attrs             = zfcp_sysfs_shost_attrs,
 354         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 355         .track_queue_depth       = 1,
 356 };
 357
 358 /**
 359  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 360  * @adapter: The zfcp adapter to register with the SCSI midlayer
 361  */
 362 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 363 {
 364         struct ccw_dev_id dev_id;
 365
 366         if (adapter->scsi_host)
 367                 return 0;
 368
 369         ccw_device_get_id(adapter->ccw_device, &dev_id);
 370         /* register adapter as SCSI host with mid layer of SCSI stack */
 371         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 372                                              sizeof (struct zfcp_adapter *));
 373         if (!adapter->scsi_host) {
 374                 dev_err(&adapter->ccw_device->dev,
 375                         "Registering the FCP device with the "
 376                         "SCSI stack failed\n");
 377                 return -EIO;
 378         }
 379
 380         /* tell the SCSI stack some characteristics of this adapter */
 381         adapter->scsi_host->max_id = 511;
 382         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 383         adapter->scsi_host->max_channel = 0;
 384         adapter->scsi_host->unique_id = dev_id.devno;
 385         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 386         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 387
 388         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 389
 390         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 391                 scsi_host_put(adapter->scsi_host);
 392                 return -EIO;
 393         }
 394
 395         return 0;
 396 }
 397
 398 /**
 399  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 400  * @adapter: The zfcp adapter to unregister.
 401  */
 402 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 403 {
 404         struct Scsi_Host *shost;
 405         struct zfcp_port *port;
 406
 407         shost = adapter->scsi_host;
 408         if (!shost)
 409                 return;
 410
 411         read_lock_irq(&adapter->port_list_lock);
 412         list_for_each_entry(port, &adapter->port_list, list)
 413                 port->rport = NULL;
 414         read_unlock_irq(&adapter->port_list_lock);
 415
 416         fc_remove_host(shost);
 417         scsi_remove_host(shost);
 418         scsi_host_put(shost);
 419         adapter->scsi_host = NULL;
 420 }
 421
 422 static struct fc_host_statistics*
 423 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 424 {
 425         struct fc_host_statistics *fc_stats;
 426
 427         if (!adapter->fc_stats) {
 428                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 429                 if (!fc_stats)
 430                         return NULL;
 431                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 432         }
 433         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 434         return adapter->fc_stats;
 435 }
 436
 437 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 438                                       struct fsf_qtcb_bottom_port *data,
 439                                       struct fsf_qtcb_bottom_port *old)
 440 {
 441         fc_stats->seconds_since_last_reset =
 442                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 443         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 444         fc_stats->tx_words = data->tx_words - old->tx_words;
 445         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 446         fc_stats->rx_words = data->rx_words - old->rx_words;
 447         fc_stats->lip_count = data->lip - old->lip;
 448         fc_stats->nos_count = data->nos - old->nos;
 449         fc_stats->error_frames = data->error_frames - old->error_frames;
 450         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 451         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 452         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 453         fc_stats->loss_of_signal_count =
 454                 data->loss_of_signal - old->loss_of_signal;
 455         fc_stats->prim_seq_protocol_err_count =
 456                 data->psp_error_counts - old->psp_error_counts;
 457         fc_stats->invalid_tx_word_count =
 458                 data->invalid_tx_words - old->invalid_tx_words;
 459         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 460         fc_stats->fcp_input_requests =
 461                 data->input_requests - old->input_requests;
 462         fc_stats->fcp_output_requests =
 463                 data->output_requests - old->output_requests;
 464         fc_stats->fcp_control_requests =
 465                 data->control_requests - old->control_requests;
 466         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 467         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 468 }
 469
 470 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 471                                    struct fsf_qtcb_bottom_port *data)
 472 {
 473         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 474         fc_stats->tx_frames = data->tx_frames;
 475         fc_stats->tx_words = data->tx_words;
 476         fc_stats->rx_frames = data->rx_frames;
 477         fc_stats->rx_words = data->rx_words;
 478         fc_stats->lip_count = data->lip;
 479         fc_stats->nos_count = data->nos;
 480         fc_stats->error_frames = data->error_frames;
 481         fc_stats->dumped_frames = data->dumped_frames;
 482         fc_stats->link_failure_count = data->link_failure;
 483         fc_stats->loss_of_sync_count = data->loss_of_sync;
 484         fc_stats->loss_of_signal_count = data->loss_of_signal;
 485         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 486         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 487         fc_stats->invalid_crc_count = data->invalid_crcs;
 488         fc_stats->fcp_input_requests = data->input_requests;
 489         fc_stats->fcp_output_requests = data->output_requests;
 490         fc_stats->fcp_control_requests = data->control_requests;
 491         fc_stats->fcp_input_megabytes = data->input_mb;
 492         fc_stats->fcp_output_megabytes = data->output_mb;
 493 }
 494
 495 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 496 {
 497         struct zfcp_adapter *adapter;
 498         struct fc_host_statistics *fc_stats;
 499         struct fsf_qtcb_bottom_port *data;
 500         int ret;
 501
 502         adapter = (struct zfcp_adapter *)host->hostdata[0];
 503         fc_stats = zfcp_init_fc_host_stats(adapter);
 504         if (!fc_stats)
 505                 return NULL;
 506
 507         data = kzalloc(sizeof(*data), GFP_KERNEL);
 508         if (!data)
 509                 return NULL;
 510
 511         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 512         if (ret) {
 513                 kfree(data);
 514                 return NULL;
 515         }
 516
 517         if (adapter->stats_reset &&
 518             ((jiffies/HZ - adapter->stats_reset) <
 519              data->seconds_since_last_reset))
 520                 zfcp_adjust_fc_host_stats(fc_stats, data,
 521                                           adapter->stats_reset_data);
 522         else
 523                 zfcp_set_fc_host_stats(fc_stats, data);
 524
 525         kfree(data);
 526         return fc_stats;
 527 }
 528
 529 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 530 {
 531         struct zfcp_adapter *adapter;
 532         struct fsf_qtcb_bottom_port *data;
 533         int ret;
 534
 535         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 536         data = kzalloc(sizeof(*data), GFP_KERNEL);
 537         if (!data)
 538                 return;
 539
 540         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 541         if (ret)
 542                 kfree(data);
 543         else {
 544                 adapter->stats_reset = jiffies/HZ;
 545                 kfree(adapter->stats_reset_data);
 546                 adapter->stats_reset_data = data; /* finally freed in
 547                                                      adapter_release */
 548         }
 549 }
 550
 551 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 552 {
 553         struct zfcp_adapter *adapter =
 554                 (struct zfcp_adapter *)shost->hostdata[0];
 555         int status = atomic_read(&adapter->status);
 556
 557         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 558             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 559                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 560         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 561                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 562         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 563                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 564         else
 565                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 566 }
 567
 568 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 569 {
 570         rport->dev_loss_tmo = timeout;
 571 }
 572
 573 /**
 574  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 575  * @rport: The FC rport where to teminate I/O
 576  *
 577  * Abort all pending SCSI commands for a port by closing the
 578  * port. Using a reopen avoids a conflict with a shutdown
 579  * overwriting a reopen. The "forced" ensures that a disappeared port
 580  * is not opened again as valid due to the cached plogi data in
 581  * non-NPIV mode.
 582  */
 583 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 584 {
 585         struct zfcp_port *port;
 586         struct Scsi_Host *shost = rport_to_shost(rport);
 587         struct zfcp_adapter *adapter =
 588                 (struct zfcp_adapter *)shost->hostdata[0];
 589
 590         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 591
 592         if (port) {
 593                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 594                 put_device(&port->dev);
 595         }
 596 }
 597
 598 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 599 {
 600         struct fc_rport_identifiers ids;
 601         struct fc_rport *rport;
 602
 603         if (port->rport)
 604                 return;
 605
 606         ids.node_name = port->wwnn;
 607         ids.port_name = port->wwpn;
 608         ids.port_id = port->d_id;
 609         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 610
 611         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 612                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 613                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 614         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 615         if (!rport) {
 616                 dev_err(&port->adapter->ccw_device->dev,
 617                         "Registering port 0x%016Lx failed\n",
 618                         (unsigned long long)port->wwpn);
 619                 return;
 620         }
 621
 622         rport->maxframe_size = port->maxframe_size;
 623         rport->supported_classes = port->supported_classes;
 624         port->rport = rport;
 625         port->starget_id = rport->scsi_target_id;
 626
 627         zfcp_unit_queue_scsi_scan(port);
 628 }
 629
 630 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 631 {
 632         struct fc_rport *rport = port->rport;
 633
 634         if (rport) {
 635                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 636                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 637                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 638                 fc_remote_port_delete(rport);
 639                 port->rport = NULL;
 640         }
 641 }
 642
 643 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 644 {
 645         get_device(&port->dev);
 646         port->rport_task = RPORT_ADD;
 647
 648         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 649                 put_device(&port->dev);
 650 }
 651
 652 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 653 {
 654         get_device(&port->dev);
 655         port->rport_task = RPORT_DEL;
 656
 657         if (port->rport && queue_work(port->adapter->work_queue,
 658                                       &port->rport_work))
 659                 return;
 660
 661         put_device(&port->dev);
 662 }
 663
 664 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 665 {
 666         unsigned long flags;
 667         struct zfcp_port *port;
 668
 669         read_lock_irqsave(&adapter->port_list_lock, flags);
 670         list_for_each_entry(port, &adapter->port_list, list)
 671                 zfcp_scsi_schedule_rport_block(port);
 672         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 673 }
 674
 675 void zfcp_scsi_rport_work(struct work_struct *work)
 676 {
 677         struct zfcp_port *port = container_of(work, struct zfcp_port,
 678                                               rport_work);
 679
 680         while (port->rport_task) {
 681                 if (port->rport_task == RPORT_ADD) {
 682                         port->rport_task = RPORT_NONE;
 683                         zfcp_scsi_rport_register(port);
 684                 } else {
 685                         port->rport_task = RPORT_NONE;
 686                         zfcp_scsi_rport_block(port);
 687                 }
 688         }
 689
 690         put_device(&port->dev);
 691 }
 692
 693 /**
 694  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 695  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 696  */
 697 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 698 {
 699         unsigned int mask = 0;
 700         unsigned int data_div;
 701         struct Scsi_Host *shost = adapter->scsi_host;
 702
 703         data_div = atomic_read(&adapter->status) &
 704                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 705
 706         if (enable_dif &&
 707             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 708                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 709
 710         if (enable_dif && data_div &&
 711             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 712                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 713                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 714                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 715                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 716                 shost->max_sectors = shost->sg_tablesize * 8;
 717         }
 718
 719         scsi_host_set_prot(shost, mask);
 720 }
 721
 722 /**
 723  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 724  * @scmd: The SCSI command to report the error for
 725  * @ascq: The ASCQ to put in the sense buffer
 726  *
 727  * See the error handling in sd_done for the sense codes used here.
 728  * Set DID_SOFT_ERROR to retry the request, if possible.
 729  */
 730 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 731 {
 732         scsi_build_sense_buffer(1, scmd->sense_buffer,
 733                                 ILLEGAL_REQUEST, 0x10, ascq);
 734         set_driver_byte(scmd, DRIVER_SENSE);
 735         scmd->result |= SAM_STAT_CHECK_CONDITION;
 736         set_host_byte(scmd, DID_SOFT_ERROR);
 737 }
 738
 739 struct fc_function_template zfcp_transport_functions = {
 740         .show_starget_port_id = 1,
 741         .show_starget_port_name = 1,
 742         .show_starget_node_name = 1,
 743         .show_rport_supported_classes = 1,
 744         .show_rport_maxframe_size = 1,
 745         .show_rport_dev_loss_tmo = 1,
 746         .show_host_node_name = 1,
 747         .show_host_port_name = 1,
 748         .show_host_permanent_port_name = 1,
 749         .show_host_supported_classes = 1,
 750         .show_host_supported_fc4s = 1,
 751         .show_host_supported_speeds = 1,
 752         .show_host_maxframe_size = 1,
 753         .show_host_serial_number = 1,
 754         .get_fc_host_stats = zfcp_get_fc_host_stats,
 755         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 756         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 757         .get_host_port_state = zfcp_get_host_port_state,
 758         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 759         .show_host_port_state = 1,
 760         .show_host_active_fc4s = 1,
 761         .bsg_request = zfcp_fc_exec_bsg_job,
 762         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 763         /* no functions registered for following dynamic attributes but
 764            directly set by LLDD */
 765         .show_host_port_type = 1,
 766         .show_host_symbolic_name = 1,
 767         .show_host_speed = 1,
 768         .show_host_port_id = 1,
 769         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 770 };