drivers/s390/scsi/zfcp_scsi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Interface to Linux SCSI midlayer.
   6  *
   7  * Copyright IBM Corp. 2002, 2018
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/slab.h>
  16 #include <scsi/fc/fc_fcp.h>
  17 #include <scsi/scsi_eh.h>
  18 #include <linux/atomic.h>
  19 #include "zfcp_ext.h"
  20 #include "zfcp_dbf.h"
  21 #include "zfcp_fc.h"
  22 #include "zfcp_reqlist.h"
  23
  24 static unsigned int default_depth = 32;
  25 module_param_named(queue_depth, default_depth, uint, 0600);
  26 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  27
  28 static bool enable_dif;
  29 module_param_named(dif, enable_dif, bool, 0400);
  30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  31
  32 static bool allow_lun_scan = true;
  33 module_param(allow_lun_scan, bool, 0600);
  34 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  35
  36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  37 {
  38         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  39
  40         /* if previous slave_alloc returned early, there is nothing to do */
  41         if (!zfcp_sdev->port)
  42                 return;
  43
  44         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  45         put_device(&zfcp_sdev->port->dev);
  46 }
  47
  48 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  49 {
  50         if (sdp->tagged_supported)
  51                 scsi_change_queue_depth(sdp, default_depth);
  52         return 0;
  53 }
  54
  55 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  56 {
  57         set_host_byte(scpnt, result);
  58         zfcp_dbf_scsi_fail_send(scpnt);
  59         scpnt->scsi_done(scpnt);
  60 }
  61
  62 static
  63 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  64 {
  65         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  66         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  67         int    status, scsi_result, ret;
  68
  69         /* reset the status for this request */
  70         scpnt->result = 0;
  71         scpnt->host_scribble = NULL;
  72
  73         scsi_result = fc_remote_port_chkready(rport);
  74         if (unlikely(scsi_result)) {
  75                 scpnt->result = scsi_result;
  76                 zfcp_dbf_scsi_fail_send(scpnt);
  77                 scpnt->scsi_done(scpnt);
  78                 return 0;
  79         }
  80
  81         status = atomic_read(&zfcp_sdev->status);
  82         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  83                      !(atomic_read(&zfcp_sdev->port->status) &
  84                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
  85                 /* only LUN access denied, but port is good
  86                  * not covered by FC transport, have to fail here */
  87                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  88                 return 0;
  89         }
  90
  91         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  92                 /* This could be
  93                  * call to rport_delete pending: mimic retry from
  94                  *      fc_remote_port_chkready until rport is BLOCKED
  95                  */
  96                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
  97                 return 0;
  98         }
  99
 100         ret = zfcp_fsf_fcp_cmnd(scpnt);
 101         if (unlikely(ret == -EBUSY))
 102                 return SCSI_MLQUEUE_DEVICE_BUSY;
 103         else if (unlikely(ret < 0))
 104                 return SCSI_MLQUEUE_HOST_BUSY;
 105
 106         return ret;
 107 }
 108
 109 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 110 {
 111         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 112         struct zfcp_adapter *adapter =
 113                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 114         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 115         struct zfcp_port *port;
 116         struct zfcp_unit *unit;
 117         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 118
 119         zfcp_sdev->erp_action.adapter = adapter;
 120         zfcp_sdev->erp_action.sdev = sdev;
 121
 122         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 123         if (!port)
 124                 return -ENXIO;
 125
 126         zfcp_sdev->erp_action.port = port;
 127
 128         mutex_lock(&zfcp_sysfs_port_units_mutex);
 129         if (zfcp_sysfs_port_is_removing(port)) {
 130                 /* port is already gone */
 131                 mutex_unlock(&zfcp_sysfs_port_units_mutex);
 132                 put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
 133                 return -ENXIO;
 134         }
 135         mutex_unlock(&zfcp_sysfs_port_units_mutex);
 136
 137         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 138         if (unit)
 139                 put_device(&unit->dev);
 140
 141         if (!unit && !(allow_lun_scan && npiv)) {
 142                 put_device(&port->dev);
 143                 return -ENXIO;
 144         }
 145
 146         zfcp_sdev->port = port;
 147         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 148         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 149         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 150         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 151         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 152         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 153         spin_lock_init(&zfcp_sdev->latencies.lock);
 154
 155         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 156         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 157         zfcp_erp_wait(port->adapter);
 158
 159         return 0;
 160 }
 161
 162 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 163 {
 164         struct Scsi_Host *scsi_host = scpnt->device->host;
 165         struct zfcp_adapter *adapter =
 166                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 167         struct zfcp_fsf_req *old_req, *abrt_req;
 168         unsigned long flags;
 169         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 170         int retval = SUCCESS, ret;
 171         int retry = 3;
 172         char *dbf_tag;
 173
 174         /* avoid race condition between late normal completion and abort */
 175         write_lock_irqsave(&adapter->abort_lock, flags);
 176
 177         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 178         if (!old_req) {
 179                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 180                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 181                 return FAILED; /* completion could be in progress */
 182         }
 183         old_req->data = NULL;
 184
 185         /* don't access old fsf_req after releasing the abort_lock */
 186         write_unlock_irqrestore(&adapter->abort_lock, flags);
 187
 188         while (retry--) {
 189                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 190                 if (abrt_req)
 191                         break;
 192
 193                 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
 194                 zfcp_erp_wait(adapter);
 195                 ret = fc_block_scsi_eh(scpnt);
 196                 if (ret) {
 197                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 198                         return ret;
 199                 }
 200                 if (!(atomic_read(&adapter->status) &
 201                       ZFCP_STATUS_COMMON_RUNNING)) {
 202                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 203                         return SUCCESS;
 204                 }
 205         }
 206         if (!abrt_req) {
 207                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 208                 return FAILED;
 209         }
 210
 211         wait_for_completion(&abrt_req->completion);
 212
 213         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 214                 dbf_tag = "abrt_ok";
 215         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 216                 dbf_tag = "abrt_nn";
 217         else {
 218                 dbf_tag = "abrt_fa";
 219                 retval = FAILED;
 220         }
 221         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 222         zfcp_fsf_req_free(abrt_req);
 223         return retval;
 224 }
 225
 226 struct zfcp_scsi_req_filter {
 227         u8 tmf_scope;
 228         u32 lun_handle;
 229         u32 port_handle;
 230 };
 231
 232 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 233 {
 234         struct zfcp_scsi_req_filter *filter =
 235                 (struct zfcp_scsi_req_filter *)data;
 236
 237         /* already aborted - prevent side-effects - or not a SCSI command */
 238         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 239                 return;
 240
 241         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 242         if (old_req->qtcb->header.port_handle != filter->port_handle)
 243                 return;
 244
 245         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 246             old_req->qtcb->header.lun_handle != filter->lun_handle)
 247                 return;
 248
 249         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 250         old_req->data = NULL;
 251 }
 252
 253 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 254 {
 255         struct zfcp_adapter *adapter = zsdev->port->adapter;
 256         struct zfcp_scsi_req_filter filter = {
 257                 .tmf_scope = FCP_TMF_TGT_RESET,
 258                 .port_handle = zsdev->port->handle,
 259         };
 260         unsigned long flags;
 261
 262         if (tm_flags == FCP_TMF_LUN_RESET) {
 263                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 264                 filter.lun_handle = zsdev->lun_handle;
 265         }
 266
 267         /*
 268          * abort_lock secures against other processings - in the abort-function
 269          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 270          */
 271         write_lock_irqsave(&adapter->abort_lock, flags);
 272         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 273                                    &filter);
 274         write_unlock_irqrestore(&adapter->abort_lock, flags);
 275 }
 276
 277 /**
 278  * zfcp_scsi_task_mgmt_function() - Send a task management function (sync).
 279  * @sdev: Pointer to SCSI device to send the task management command to.
 280  * @tm_flags: Task management flags,
 281  *            here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
 282  */
 283 static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
 284 {
 285         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 286         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 287         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 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(sdev, tm_flags);
 294                 if (fsf_req)
 295                         break;
 296
 297                 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
 298                 zfcp_erp_wait(adapter);
 299                 ret = fc_block_rport(rport);
 300                 if (ret) {
 301                         zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
 302                         return ret;
 303                 }
 304
 305                 if (!(atomic_read(&adapter->status) &
 306                       ZFCP_STATUS_COMMON_RUNNING)) {
 307                         zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
 308                         return SUCCESS;
 309                 }
 310         }
 311         if (!fsf_req) {
 312                 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
 313                 return FAILED;
 314         }
 315
 316         wait_for_completion(&fsf_req->completion);
 317
 318         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 319                 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
 320                 retval = FAILED;
 321         } else {
 322                 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
 323                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 324         }
 325
 326         zfcp_fsf_req_free(fsf_req);
 327         return retval;
 328 }
 329
 330 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 331 {
 332         struct scsi_device *sdev = scpnt->device;
 333
 334         return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
 335 }
 336
 337 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 338 {
 339         struct scsi_target *starget = scsi_target(scpnt->device);
 340         struct fc_rport *rport = starget_to_rport(starget);
 341         struct Scsi_Host *shost = rport_to_shost(rport);
 342         struct scsi_device *sdev = NULL, *tmp_sdev;
 343         struct zfcp_adapter *adapter =
 344                 (struct zfcp_adapter *)shost->hostdata[0];
 345         int ret;
 346
 347         shost_for_each_device(tmp_sdev, shost) {
 348                 if (tmp_sdev->id == starget->id) {
 349                         sdev = tmp_sdev;
 350                         break;
 351                 }
 352         }
 353         if (!sdev) {
 354                 ret = FAILED;
 355                 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
 356                 return ret;
 357         }
 358
 359         ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
 360
 361         /* release reference from above shost_for_each_device */
 362         if (sdev)
 363                 scsi_device_put(tmp_sdev);
 364
 365         return ret;
 366 }
 367
 368 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 369 {
 370         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 371         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 372         int ret = SUCCESS, fc_ret;
 373
 374         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
 375                 zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p");
 376                 zfcp_erp_wait(adapter);
 377         }
 378         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 379         zfcp_erp_wait(adapter);
 380         fc_ret = fc_block_scsi_eh(scpnt);
 381         if (fc_ret)
 382                 ret = fc_ret;
 383
 384         zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 385         return ret;
 386 }
 387
 388 /**
 389  * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
 390  * @shost: Pointer to Scsi_Host to perform action on.
 391  * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
 392  *
 393  * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
 394  *
 395  * This is similar to zfcp_sysfs_adapter_failed_store().
 396  */
 397 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
 398 {
 399         struct zfcp_adapter *adapter =
 400                 (struct zfcp_adapter *)shost->hostdata[0];
 401         int ret = 0;
 402
 403         if (reset_type != SCSI_ADAPTER_RESET) {
 404                 ret = -EOPNOTSUPP;
 405                 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
 406                 return ret;
 407         }
 408
 409         zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
 410         return ret;
 411 }
 412
 413 struct scsi_transport_template *zfcp_scsi_transport_template;
 414
 415 static struct scsi_host_template zfcp_scsi_host_template = {
 416         .module                  = THIS_MODULE,
 417         .name                    = "zfcp",
 418         .queuecommand            = zfcp_scsi_queuecommand,
 419         .eh_timed_out            = fc_eh_timed_out,
 420         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 421         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 422         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 423         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 424         .slave_alloc             = zfcp_scsi_slave_alloc,
 425         .slave_configure         = zfcp_scsi_slave_configure,
 426         .slave_destroy           = zfcp_scsi_slave_destroy,
 427         .change_queue_depth      = scsi_change_queue_depth,
 428         .host_reset              = zfcp_scsi_sysfs_host_reset,
 429         .proc_name               = "zfcp",
 430         .can_queue               = 4096,
 431         .this_id                 = -1,
 432         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 433                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 434                                    /* GCD, adjusted later */
 435         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 436                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 437                                    /* GCD, adjusted later */
 438         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 439         .use_clustering          = 1,
 440         .shost_attrs             = zfcp_sysfs_shost_attrs,
 441         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 442         .track_queue_depth       = 1,
 443         .supported_mode          = MODE_INITIATOR,
 444 };
 445
 446 /**
 447  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 448  * @adapter: The zfcp adapter to register with the SCSI midlayer
 449  */
 450 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 451 {
 452         struct ccw_dev_id dev_id;
 453
 454         if (adapter->scsi_host)
 455                 return 0;
 456
 457         ccw_device_get_id(adapter->ccw_device, &dev_id);
 458         /* register adapter as SCSI host with mid layer of SCSI stack */
 459         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 460                                              sizeof (struct zfcp_adapter *));
 461         if (!adapter->scsi_host) {
 462                 dev_err(&adapter->ccw_device->dev,
 463                         "Registering the FCP device with the "
 464                         "SCSI stack failed\n");
 465                 return -EIO;
 466         }
 467
 468         /* tell the SCSI stack some characteristics of this adapter */
 469         adapter->scsi_host->max_id = 511;
 470         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 471         adapter->scsi_host->max_channel = 0;
 472         adapter->scsi_host->unique_id = dev_id.devno;
 473         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 474         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 475
 476         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 477
 478         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 479                 scsi_host_put(adapter->scsi_host);
 480                 return -EIO;
 481         }
 482
 483         return 0;
 484 }
 485
 486 /**
 487  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 488  * @adapter: The zfcp adapter to unregister.
 489  */
 490 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 491 {
 492         struct Scsi_Host *shost;
 493         struct zfcp_port *port;
 494
 495         shost = adapter->scsi_host;
 496         if (!shost)
 497                 return;
 498
 499         read_lock_irq(&adapter->port_list_lock);
 500         list_for_each_entry(port, &adapter->port_list, list)
 501                 port->rport = NULL;
 502         read_unlock_irq(&adapter->port_list_lock);
 503
 504         fc_remove_host(shost);
 505         scsi_remove_host(shost);
 506         scsi_host_put(shost);
 507         adapter->scsi_host = NULL;
 508 }
 509
 510 static struct fc_host_statistics*
 511 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter)
 512 {
 513         struct fc_host_statistics *fc_stats;
 514
 515         if (!adapter->fc_stats) {
 516                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 517                 if (!fc_stats)
 518                         return NULL;
 519                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 520         }
 521         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 522         return adapter->fc_stats;
 523 }
 524
 525 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 526                                            struct fsf_qtcb_bottom_port *data,
 527                                            struct fsf_qtcb_bottom_port *old)
 528 {
 529         fc_stats->seconds_since_last_reset =
 530                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 531         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 532         fc_stats->tx_words = data->tx_words - old->tx_words;
 533         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 534         fc_stats->rx_words = data->rx_words - old->rx_words;
 535         fc_stats->lip_count = data->lip - old->lip;
 536         fc_stats->nos_count = data->nos - old->nos;
 537         fc_stats->error_frames = data->error_frames - old->error_frames;
 538         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 539         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 540         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 541         fc_stats->loss_of_signal_count =
 542                 data->loss_of_signal - old->loss_of_signal;
 543         fc_stats->prim_seq_protocol_err_count =
 544                 data->psp_error_counts - old->psp_error_counts;
 545         fc_stats->invalid_tx_word_count =
 546                 data->invalid_tx_words - old->invalid_tx_words;
 547         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 548         fc_stats->fcp_input_requests =
 549                 data->input_requests - old->input_requests;
 550         fc_stats->fcp_output_requests =
 551                 data->output_requests - old->output_requests;
 552         fc_stats->fcp_control_requests =
 553                 data->control_requests - old->control_requests;
 554         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 555         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 556 }
 557
 558 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 559                                         struct fsf_qtcb_bottom_port *data)
 560 {
 561         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 562         fc_stats->tx_frames = data->tx_frames;
 563         fc_stats->tx_words = data->tx_words;
 564         fc_stats->rx_frames = data->rx_frames;
 565         fc_stats->rx_words = data->rx_words;
 566         fc_stats->lip_count = data->lip;
 567         fc_stats->nos_count = data->nos;
 568         fc_stats->error_frames = data->error_frames;
 569         fc_stats->dumped_frames = data->dumped_frames;
 570         fc_stats->link_failure_count = data->link_failure;
 571         fc_stats->loss_of_sync_count = data->loss_of_sync;
 572         fc_stats->loss_of_signal_count = data->loss_of_signal;
 573         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 574         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 575         fc_stats->invalid_crc_count = data->invalid_crcs;
 576         fc_stats->fcp_input_requests = data->input_requests;
 577         fc_stats->fcp_output_requests = data->output_requests;
 578         fc_stats->fcp_control_requests = data->control_requests;
 579         fc_stats->fcp_input_megabytes = data->input_mb;
 580         fc_stats->fcp_output_megabytes = data->output_mb;
 581 }
 582
 583 static struct fc_host_statistics *
 584 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
 585 {
 586         struct zfcp_adapter *adapter;
 587         struct fc_host_statistics *fc_stats;
 588         struct fsf_qtcb_bottom_port *data;
 589         int ret;
 590
 591         adapter = (struct zfcp_adapter *)host->hostdata[0];
 592         fc_stats = zfcp_scsi_init_fc_host_stats(adapter);
 593         if (!fc_stats)
 594                 return NULL;
 595
 596         data = kzalloc(sizeof(*data), GFP_KERNEL);
 597         if (!data)
 598                 return NULL;
 599
 600         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 601         if (ret) {
 602                 kfree(data);
 603                 return NULL;
 604         }
 605
 606         if (adapter->stats_reset &&
 607             ((jiffies/HZ - adapter->stats_reset) <
 608              data->seconds_since_last_reset))
 609                 zfcp_scsi_adjust_fc_host_stats(fc_stats, data,
 610                                                adapter->stats_reset_data);
 611         else
 612                 zfcp_scsi_set_fc_host_stats(fc_stats, data);
 613
 614         kfree(data);
 615         return fc_stats;
 616 }
 617
 618 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
 619 {
 620         struct zfcp_adapter *adapter;
 621         struct fsf_qtcb_bottom_port *data;
 622         int ret;
 623
 624         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 625         data = kzalloc(sizeof(*data), GFP_KERNEL);
 626         if (!data)
 627                 return;
 628
 629         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 630         if (ret)
 631                 kfree(data);
 632         else {
 633                 adapter->stats_reset = jiffies/HZ;
 634                 kfree(adapter->stats_reset_data);
 635                 adapter->stats_reset_data = data; /* finally freed in
 636                                                      adapter_release */
 637         }
 638 }
 639
 640 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost)
 641 {
 642         struct zfcp_adapter *adapter =
 643                 (struct zfcp_adapter *)shost->hostdata[0];
 644         int status = atomic_read(&adapter->status);
 645
 646         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 647             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 648                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 649         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 650                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 651         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 652                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 653         else
 654                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 655 }
 656
 657 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport,
 658                                              u32 timeout)
 659 {
 660         rport->dev_loss_tmo = timeout;
 661 }
 662
 663 /**
 664  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 665  * @rport: The FC rport where to teminate I/O
 666  *
 667  * Abort all pending SCSI commands for a port by closing the
 668  * port. Using a reopen avoids a conflict with a shutdown
 669  * overwriting a reopen. The "forced" ensures that a disappeared port
 670  * is not opened again as valid due to the cached plogi data in
 671  * non-NPIV mode.
 672  */
 673 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 674 {
 675         struct zfcp_port *port;
 676         struct Scsi_Host *shost = rport_to_shost(rport);
 677         struct zfcp_adapter *adapter =
 678                 (struct zfcp_adapter *)shost->hostdata[0];
 679
 680         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 681
 682         if (port) {
 683                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 684                 put_device(&port->dev);
 685         } else {
 686                 zfcp_erp_port_forced_no_port_dbf(
 687                         "sctrpin", adapter,
 688                         rport->port_name /* zfcp_scsi_rport_register */,
 689                         rport->port_id /* zfcp_scsi_rport_register */);
 690         }
 691 }
 692
 693 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 694 {
 695         struct fc_rport_identifiers ids;
 696         struct fc_rport *rport;
 697
 698         if (port->rport)
 699                 return;
 700
 701         ids.node_name = port->wwnn;
 702         ids.port_name = port->wwpn;
 703         ids.port_id = port->d_id;
 704         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 705
 706         zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
 707                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 708                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 709         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 710         if (!rport) {
 711                 dev_err(&port->adapter->ccw_device->dev,
 712                         "Registering port 0x%016Lx failed\n",
 713                         (unsigned long long)port->wwpn);
 714                 return;
 715         }
 716
 717         rport->maxframe_size = port->maxframe_size;
 718         rport->supported_classes = port->supported_classes;
 719         port->rport = rport;
 720         port->starget_id = rport->scsi_target_id;
 721
 722         zfcp_unit_queue_scsi_scan(port);
 723 }
 724
 725 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 726 {
 727         struct fc_rport *rport = port->rport;
 728
 729         if (rport) {
 730                 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
 731                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 732                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 733                 fc_remote_port_delete(rport);
 734                 port->rport = NULL;
 735         }
 736 }
 737
 738 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 739 {
 740         get_device(&port->dev);
 741         port->rport_task = RPORT_ADD;
 742
 743         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 744                 put_device(&port->dev);
 745 }
 746
 747 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 748 {
 749         get_device(&port->dev);
 750         port->rport_task = RPORT_DEL;
 751
 752         if (port->rport && queue_work(port->adapter->work_queue,
 753                                       &port->rport_work))
 754                 return;
 755
 756         put_device(&port->dev);
 757 }
 758
 759 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 760 {
 761         unsigned long flags;
 762         struct zfcp_port *port;
 763
 764         read_lock_irqsave(&adapter->port_list_lock, flags);
 765         list_for_each_entry(port, &adapter->port_list, list)
 766                 zfcp_scsi_schedule_rport_block(port);
 767         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 768 }
 769
 770 void zfcp_scsi_rport_work(struct work_struct *work)
 771 {
 772         struct zfcp_port *port = container_of(work, struct zfcp_port,
 773                                               rport_work);
 774
 775         set_worker_desc("zrp%c-%16llx",
 776                         (port->rport_task == RPORT_ADD) ? 'a' : 'd',
 777                         port->wwpn); /* < WORKER_DESC_LEN=24 */
 778         while (port->rport_task) {
 779                 if (port->rport_task == RPORT_ADD) {
 780                         port->rport_task = RPORT_NONE;
 781                         zfcp_scsi_rport_register(port);
 782                 } else {
 783                         port->rport_task = RPORT_NONE;
 784                         zfcp_scsi_rport_block(port);
 785                 }
 786         }
 787
 788         put_device(&port->dev);
 789 }
 790
 791 /**
 792  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 793  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 794  */
 795 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 796 {
 797         unsigned int mask = 0;
 798         unsigned int data_div;
 799         struct Scsi_Host *shost = adapter->scsi_host;
 800
 801         data_div = atomic_read(&adapter->status) &
 802                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 803
 804         if (enable_dif &&
 805             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 806                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 807
 808         if (enable_dif && data_div &&
 809             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 810                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 811                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 812                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 813                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 814                 shost->max_sectors = shost->sg_tablesize * 8;
 815         }
 816
 817         scsi_host_set_prot(shost, mask);
 818 }
 819
 820 /**
 821  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 822  * @scmd: The SCSI command to report the error for
 823  * @ascq: The ASCQ to put in the sense buffer
 824  *
 825  * See the error handling in sd_done for the sense codes used here.
 826  * Set DID_SOFT_ERROR to retry the request, if possible.
 827  */
 828 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 829 {
 830         scsi_build_sense_buffer(1, scmd->sense_buffer,
 831                                 ILLEGAL_REQUEST, 0x10, ascq);
 832         set_driver_byte(scmd, DRIVER_SENSE);
 833         scmd->result |= SAM_STAT_CHECK_CONDITION;
 834         set_host_byte(scmd, DID_SOFT_ERROR);
 835 }
 836
 837 struct fc_function_template zfcp_transport_functions = {
 838         .show_starget_port_id = 1,
 839         .show_starget_port_name = 1,
 840         .show_starget_node_name = 1,
 841         .show_rport_supported_classes = 1,
 842         .show_rport_maxframe_size = 1,
 843         .show_rport_dev_loss_tmo = 1,
 844         .show_host_node_name = 1,
 845         .show_host_port_name = 1,
 846         .show_host_permanent_port_name = 1,
 847         .show_host_supported_classes = 1,
 848         .show_host_supported_fc4s = 1,
 849         .show_host_supported_speeds = 1,
 850         .show_host_maxframe_size = 1,
 851         .show_host_serial_number = 1,
 852         .get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
 853         .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
 854         .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
 855         .get_host_port_state = zfcp_scsi_get_host_port_state,
 856         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 857         .show_host_port_state = 1,
 858         .show_host_active_fc4s = 1,
 859         .bsg_request = zfcp_fc_exec_bsg_job,
 860         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 861         /* no functions registered for following dynamic attributes but
 862            directly set by LLDD */
 863         .show_host_port_type = 1,
 864         .show_host_symbolic_name = 1,
 865         .show_host_speed = 1,
 866         .show_host_port_id = 1,
 867         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 868 };