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 data integrity support (default off)");
  31
  32 bool zfcp_experimental_dix;
  33 module_param_named(dix, zfcp_experimental_dix, bool, 0400);
  34 MODULE_PARM_DESC(dix, "Enable experimental DIX (data integrity extension) support which implies DIF support (default off)");
  35
  36 static bool allow_lun_scan = true;
  37 module_param(allow_lun_scan, bool, 0600);
  38 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  39
  40 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  41 {
  42         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  43
  44         /* if previous slave_alloc returned early, there is nothing to do */
  45         if (!zfcp_sdev->port)
  46                 return;
  47
  48         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  49         put_device(&zfcp_sdev->port->dev);
  50 }
  51
  52 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  53 {
  54         if (sdp->tagged_supported)
  55                 scsi_change_queue_depth(sdp, default_depth);
  56         return 0;
  57 }
  58
  59 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  60 {
  61         set_host_byte(scpnt, result);
  62         zfcp_dbf_scsi_fail_send(scpnt);
  63         scpnt->scsi_done(scpnt);
  64 }
  65
  66 static
  67 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  68 {
  69         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  70         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  71         int    status, scsi_result, ret;
  72
  73         /* reset the status for this request */
  74         scpnt->result = 0;
  75         scpnt->host_scribble = NULL;
  76
  77         scsi_result = fc_remote_port_chkready(rport);
  78         if (unlikely(scsi_result)) {
  79                 scpnt->result = scsi_result;
  80                 zfcp_dbf_scsi_fail_send(scpnt);
  81                 scpnt->scsi_done(scpnt);
  82                 return 0;
  83         }
  84
  85         status = atomic_read(&zfcp_sdev->status);
  86         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  87                      !(atomic_read(&zfcp_sdev->port->status) &
  88                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
  89                 /* only LUN access denied, but port is good
  90                  * not covered by FC transport, have to fail here */
  91                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  92                 return 0;
  93         }
  94
  95         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  96                 /* This could be
  97                  * call to rport_delete pending: mimic retry from
  98                  *      fc_remote_port_chkready until rport is BLOCKED
  99                  */
 100                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 101                 return 0;
 102         }
 103
 104         ret = zfcp_fsf_fcp_cmnd(scpnt);
 105         if (unlikely(ret == -EBUSY))
 106                 return SCSI_MLQUEUE_DEVICE_BUSY;
 107         else if (unlikely(ret < 0))
 108                 return SCSI_MLQUEUE_HOST_BUSY;
 109
 110         return ret;
 111 }
 112
 113 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 114 {
 115         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 116         struct zfcp_adapter *adapter =
 117                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 118         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 119         struct zfcp_port *port;
 120         struct zfcp_unit *unit;
 121         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 122
 123         zfcp_sdev->erp_action.adapter = adapter;
 124         zfcp_sdev->erp_action.sdev = sdev;
 125
 126         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 127         if (!port)
 128                 return -ENXIO;
 129
 130         zfcp_sdev->erp_action.port = port;
 131
 132         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 133         if (unit)
 134                 put_device(&unit->dev);
 135
 136         if (!unit && !(allow_lun_scan && npiv)) {
 137                 put_device(&port->dev);
 138                 return -ENXIO;
 139         }
 140
 141         zfcp_sdev->port = port;
 142         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 143         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 144         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 145         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 146         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 147         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 148         spin_lock_init(&zfcp_sdev->latencies.lock);
 149
 150         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 151         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 152         zfcp_erp_wait(port->adapter);
 153
 154         return 0;
 155 }
 156
 157 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 158 {
 159         struct Scsi_Host *scsi_host = scpnt->device->host;
 160         struct zfcp_adapter *adapter =
 161                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 162         struct zfcp_fsf_req *old_req, *abrt_req;
 163         unsigned long flags;
 164         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 165         int retval = SUCCESS, ret;
 166         int retry = 3;
 167         char *dbf_tag;
 168
 169         /* avoid race condition between late normal completion and abort */
 170         write_lock_irqsave(&adapter->abort_lock, flags);
 171
 172         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 173         if (!old_req) {
 174                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 175                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 176                 return FAILED; /* completion could be in progress */
 177         }
 178         old_req->data = NULL;
 179
 180         /* don't access old fsf_req after releasing the abort_lock */
 181         write_unlock_irqrestore(&adapter->abort_lock, flags);
 182
 183         while (retry--) {
 184                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 185                 if (abrt_req)
 186                         break;
 187
 188                 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
 189                 zfcp_erp_wait(adapter);
 190                 ret = fc_block_scsi_eh(scpnt);
 191                 if (ret) {
 192                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 193                         return ret;
 194                 }
 195                 if (!(atomic_read(&adapter->status) &
 196                       ZFCP_STATUS_COMMON_RUNNING)) {
 197                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 198                         return SUCCESS;
 199                 }
 200         }
 201         if (!abrt_req) {
 202                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 203                 return FAILED;
 204         }
 205
 206         wait_for_completion(&abrt_req->completion);
 207
 208         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 209                 dbf_tag = "abrt_ok";
 210         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 211                 dbf_tag = "abrt_nn";
 212         else {
 213                 dbf_tag = "abrt_fa";
 214                 retval = FAILED;
 215         }
 216         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 217         zfcp_fsf_req_free(abrt_req);
 218         return retval;
 219 }
 220
 221 struct zfcp_scsi_req_filter {
 222         u8 tmf_scope;
 223         u32 lun_handle;
 224         u32 port_handle;
 225 };
 226
 227 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 228 {
 229         struct zfcp_scsi_req_filter *filter =
 230                 (struct zfcp_scsi_req_filter *)data;
 231
 232         /* already aborted - prevent side-effects - or not a SCSI command */
 233         if (old_req->data == NULL ||
 234             zfcp_fsf_req_is_status_read_buffer(old_req) ||
 235             old_req->qtcb->header.fsf_command != FSF_QTCB_FCP_CMND)
 236                 return;
 237
 238         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 239         if (old_req->qtcb->header.port_handle != filter->port_handle)
 240                 return;
 241
 242         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 243             old_req->qtcb->header.lun_handle != filter->lun_handle)
 244                 return;
 245
 246         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 247         old_req->data = NULL;
 248 }
 249
 250 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 251 {
 252         struct zfcp_adapter *adapter = zsdev->port->adapter;
 253         struct zfcp_scsi_req_filter filter = {
 254                 .tmf_scope = FCP_TMF_TGT_RESET,
 255                 .port_handle = zsdev->port->handle,
 256         };
 257         unsigned long flags;
 258
 259         if (tm_flags == FCP_TMF_LUN_RESET) {
 260                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 261                 filter.lun_handle = zsdev->lun_handle;
 262         }
 263
 264         /*
 265          * abort_lock secures against other processings - in the abort-function
 266          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 267          */
 268         write_lock_irqsave(&adapter->abort_lock, flags);
 269         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 270                                    &filter);
 271         write_unlock_irqrestore(&adapter->abort_lock, flags);
 272 }
 273
 274 /**
 275  * zfcp_scsi_task_mgmt_function() - Send a task management function (sync).
 276  * @sdev: Pointer to SCSI device to send the task management command to.
 277  * @tm_flags: Task management flags,
 278  *            here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
 279  */
 280 static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
 281 {
 282         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 283         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 284         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 285         struct zfcp_fsf_req *fsf_req = NULL;
 286         int retval = SUCCESS, ret;
 287         int retry = 3;
 288
 289         while (retry--) {
 290                 fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags);
 291                 if (fsf_req)
 292                         break;
 293
 294                 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
 295                 zfcp_erp_wait(adapter);
 296                 ret = fc_block_rport(rport);
 297                 if (ret) {
 298                         zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
 299                         return ret;
 300                 }
 301
 302                 if (!(atomic_read(&adapter->status) &
 303                       ZFCP_STATUS_COMMON_RUNNING)) {
 304                         zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
 305                         return SUCCESS;
 306                 }
 307         }
 308         if (!fsf_req) {
 309                 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
 310                 return FAILED;
 311         }
 312
 313         wait_for_completion(&fsf_req->completion);
 314
 315         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 316                 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
 317                 retval = FAILED;
 318         } else {
 319                 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
 320                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 321         }
 322
 323         zfcp_fsf_req_free(fsf_req);
 324         return retval;
 325 }
 326
 327 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 328 {
 329         struct scsi_device *sdev = scpnt->device;
 330
 331         return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
 332 }
 333
 334 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 335 {
 336         struct scsi_target *starget = scsi_target(scpnt->device);
 337         struct fc_rport *rport = starget_to_rport(starget);
 338         struct Scsi_Host *shost = rport_to_shost(rport);
 339         struct scsi_device *sdev = NULL, *tmp_sdev;
 340         struct zfcp_adapter *adapter =
 341                 (struct zfcp_adapter *)shost->hostdata[0];
 342         int ret;
 343
 344         shost_for_each_device(tmp_sdev, shost) {
 345                 if (tmp_sdev->id == starget->id) {
 346                         sdev = tmp_sdev;
 347                         break;
 348                 }
 349         }
 350         if (!sdev) {
 351                 ret = FAILED;
 352                 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
 353                 return ret;
 354         }
 355
 356         ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
 357
 358         /* release reference from above shost_for_each_device */
 359         if (sdev)
 360                 scsi_device_put(tmp_sdev);
 361
 362         return ret;
 363 }
 364
 365 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 366 {
 367         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 368         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 369         int ret = SUCCESS, fc_ret;
 370
 371         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 372         zfcp_erp_wait(adapter);
 373         fc_ret = fc_block_scsi_eh(scpnt);
 374         if (fc_ret)
 375                 ret = fc_ret;
 376
 377         zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 378         return ret;
 379 }
 380
 381 /**
 382  * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
 383  * @shost: Pointer to Scsi_Host to perform action on.
 384  * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
 385  *
 386  * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
 387  *
 388  * This is similar to zfcp_sysfs_adapter_failed_store().
 389  */
 390 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
 391 {
 392         struct zfcp_adapter *adapter =
 393                 (struct zfcp_adapter *)shost->hostdata[0];
 394         int ret = 0;
 395
 396         if (reset_type != SCSI_ADAPTER_RESET) {
 397                 ret = -EOPNOTSUPP;
 398                 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
 399                 return ret;
 400         }
 401
 402         zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
 403         return ret;
 404 }
 405
 406 struct scsi_transport_template *zfcp_scsi_transport_template;
 407
 408 static struct scsi_host_template zfcp_scsi_host_template = {
 409         .module                  = THIS_MODULE,
 410         .name                    = "zfcp",
 411         .queuecommand            = zfcp_scsi_queuecommand,
 412         .eh_timed_out            = fc_eh_timed_out,
 413         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 414         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 415         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 416         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 417         .slave_alloc             = zfcp_scsi_slave_alloc,
 418         .slave_configure         = zfcp_scsi_slave_configure,
 419         .slave_destroy           = zfcp_scsi_slave_destroy,
 420         .change_queue_depth      = scsi_change_queue_depth,
 421         .host_reset              = zfcp_scsi_sysfs_host_reset,
 422         .proc_name               = "zfcp",
 423         .can_queue               = 4096,
 424         .this_id                 = -1,
 425         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 426                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 427                                    /* GCD, adjusted later */
 428         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 429                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 430                                    /* GCD, adjusted later */
 431         /* report size limit per scatter-gather segment */
 432         .max_segment_size        = ZFCP_QDIO_SBALE_LEN,
 433         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 434         .shost_attrs             = zfcp_sysfs_shost_attrs,
 435         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 436         .track_queue_depth       = 1,
 437         .supported_mode          = MODE_INITIATOR,
 438 };
 439
 440 /**
 441  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 442  * @adapter: The zfcp adapter to register with the SCSI midlayer
 443  */
 444 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 445 {
 446         struct ccw_dev_id dev_id;
 447
 448         if (adapter->scsi_host)
 449                 return 0;
 450
 451         ccw_device_get_id(adapter->ccw_device, &dev_id);
 452         /* register adapter as SCSI host with mid layer of SCSI stack */
 453         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 454                                              sizeof (struct zfcp_adapter *));
 455         if (!adapter->scsi_host) {
 456                 dev_err(&adapter->ccw_device->dev,
 457                         "Registering the FCP device with the "
 458                         "SCSI stack failed\n");
 459                 return -EIO;
 460         }
 461
 462         /* tell the SCSI stack some characteristics of this adapter */
 463         adapter->scsi_host->max_id = 511;
 464         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 465         adapter->scsi_host->max_channel = 0;
 466         adapter->scsi_host->unique_id = dev_id.devno;
 467         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 468         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 469
 470         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 471
 472         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 473                 scsi_host_put(adapter->scsi_host);
 474                 return -EIO;
 475         }
 476
 477         return 0;
 478 }
 479
 480 /**
 481  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 482  * @adapter: The zfcp adapter to unregister.
 483  */
 484 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 485 {
 486         struct Scsi_Host *shost;
 487         struct zfcp_port *port;
 488
 489         shost = adapter->scsi_host;
 490         if (!shost)
 491                 return;
 492
 493         read_lock_irq(&adapter->port_list_lock);
 494         list_for_each_entry(port, &adapter->port_list, list)
 495                 port->rport = NULL;
 496         read_unlock_irq(&adapter->port_list_lock);
 497
 498         fc_remove_host(shost);
 499         scsi_remove_host(shost);
 500         scsi_host_put(shost);
 501         adapter->scsi_host = NULL;
 502 }
 503
 504 static struct fc_host_statistics*
 505 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter)
 506 {
 507         struct fc_host_statistics *fc_stats;
 508
 509         if (!adapter->fc_stats) {
 510                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 511                 if (!fc_stats)
 512                         return NULL;
 513                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 514         }
 515         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 516         return adapter->fc_stats;
 517 }
 518
 519 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 520                                            struct fsf_qtcb_bottom_port *data,
 521                                            struct fsf_qtcb_bottom_port *old)
 522 {
 523         fc_stats->seconds_since_last_reset =
 524                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 525         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 526         fc_stats->tx_words = data->tx_words - old->tx_words;
 527         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 528         fc_stats->rx_words = data->rx_words - old->rx_words;
 529         fc_stats->lip_count = data->lip - old->lip;
 530         fc_stats->nos_count = data->nos - old->nos;
 531         fc_stats->error_frames = data->error_frames - old->error_frames;
 532         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 533         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 534         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 535         fc_stats->loss_of_signal_count =
 536                 data->loss_of_signal - old->loss_of_signal;
 537         fc_stats->prim_seq_protocol_err_count =
 538                 data->psp_error_counts - old->psp_error_counts;
 539         fc_stats->invalid_tx_word_count =
 540                 data->invalid_tx_words - old->invalid_tx_words;
 541         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 542         fc_stats->fcp_input_requests =
 543                 data->input_requests - old->input_requests;
 544         fc_stats->fcp_output_requests =
 545                 data->output_requests - old->output_requests;
 546         fc_stats->fcp_control_requests =
 547                 data->control_requests - old->control_requests;
 548         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 549         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 550 }
 551
 552 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 553                                         struct fsf_qtcb_bottom_port *data)
 554 {
 555         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 556         fc_stats->tx_frames = data->tx_frames;
 557         fc_stats->tx_words = data->tx_words;
 558         fc_stats->rx_frames = data->rx_frames;
 559         fc_stats->rx_words = data->rx_words;
 560         fc_stats->lip_count = data->lip;
 561         fc_stats->nos_count = data->nos;
 562         fc_stats->error_frames = data->error_frames;
 563         fc_stats->dumped_frames = data->dumped_frames;
 564         fc_stats->link_failure_count = data->link_failure;
 565         fc_stats->loss_of_sync_count = data->loss_of_sync;
 566         fc_stats->loss_of_signal_count = data->loss_of_signal;
 567         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 568         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 569         fc_stats->invalid_crc_count = data->invalid_crcs;
 570         fc_stats->fcp_input_requests = data->input_requests;
 571         fc_stats->fcp_output_requests = data->output_requests;
 572         fc_stats->fcp_control_requests = data->control_requests;
 573         fc_stats->fcp_input_megabytes = data->input_mb;
 574         fc_stats->fcp_output_megabytes = data->output_mb;
 575 }
 576
 577 static struct fc_host_statistics *
 578 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
 579 {
 580         struct zfcp_adapter *adapter;
 581         struct fc_host_statistics *fc_stats;
 582         struct fsf_qtcb_bottom_port *data;
 583         int ret;
 584
 585         adapter = (struct zfcp_adapter *)host->hostdata[0];
 586         fc_stats = zfcp_scsi_init_fc_host_stats(adapter);
 587         if (!fc_stats)
 588                 return NULL;
 589
 590         data = kzalloc(sizeof(*data), GFP_KERNEL);
 591         if (!data)
 592                 return NULL;
 593
 594         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 595         if (ret) {
 596                 kfree(data);
 597                 return NULL;
 598         }
 599
 600         if (adapter->stats_reset &&
 601             ((jiffies/HZ - adapter->stats_reset) <
 602              data->seconds_since_last_reset))
 603                 zfcp_scsi_adjust_fc_host_stats(fc_stats, data,
 604                                                adapter->stats_reset_data);
 605         else
 606                 zfcp_scsi_set_fc_host_stats(fc_stats, data);
 607
 608         kfree(data);
 609         return fc_stats;
 610 }
 611
 612 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
 613 {
 614         struct zfcp_adapter *adapter;
 615         struct fsf_qtcb_bottom_port *data;
 616         int ret;
 617
 618         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 619         data = kzalloc(sizeof(*data), GFP_KERNEL);
 620         if (!data)
 621                 return;
 622
 623         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 624         if (ret)
 625                 kfree(data);
 626         else {
 627                 adapter->stats_reset = jiffies/HZ;
 628                 kfree(adapter->stats_reset_data);
 629                 adapter->stats_reset_data = data; /* finally freed in
 630                                                      adapter_release */
 631         }
 632 }
 633
 634 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost)
 635 {
 636         struct zfcp_adapter *adapter =
 637                 (struct zfcp_adapter *)shost->hostdata[0];
 638         int status = atomic_read(&adapter->status);
 639
 640         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 641             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 642                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 643         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 644                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 645         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 646                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 647         else
 648                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 649 }
 650
 651 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport,
 652                                              u32 timeout)
 653 {
 654         rport->dev_loss_tmo = timeout;
 655 }
 656
 657 /**
 658  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 659  * @rport: The FC rport where to teminate I/O
 660  *
 661  * Abort all pending SCSI commands for a port by closing the
 662  * port. Using a reopen avoids a conflict with a shutdown
 663  * overwriting a reopen. The "forced" ensures that a disappeared port
 664  * is not opened again as valid due to the cached plogi data in
 665  * non-NPIV mode.
 666  */
 667 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 668 {
 669         struct zfcp_port *port;
 670         struct Scsi_Host *shost = rport_to_shost(rport);
 671         struct zfcp_adapter *adapter =
 672                 (struct zfcp_adapter *)shost->hostdata[0];
 673
 674         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 675
 676         if (port) {
 677                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 678                 put_device(&port->dev);
 679         } else {
 680                 zfcp_erp_port_forced_no_port_dbf(
 681                         "sctrpin", adapter,
 682                         rport->port_name /* zfcp_scsi_rport_register */,
 683                         rport->port_id /* zfcp_scsi_rport_register */);
 684         }
 685 }
 686
 687 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 688 {
 689         struct fc_rport_identifiers ids;
 690         struct fc_rport *rport;
 691
 692         if (port->rport)
 693                 return;
 694
 695         ids.node_name = port->wwnn;
 696         ids.port_name = port->wwpn;
 697         ids.port_id = port->d_id;
 698         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 699
 700         zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
 701                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 702                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 703         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 704         if (!rport) {
 705                 dev_err(&port->adapter->ccw_device->dev,
 706                         "Registering port 0x%016Lx failed\n",
 707                         (unsigned long long)port->wwpn);
 708                 return;
 709         }
 710
 711         rport->maxframe_size = port->maxframe_size;
 712         rport->supported_classes = port->supported_classes;
 713         port->rport = rport;
 714         port->starget_id = rport->scsi_target_id;
 715
 716         zfcp_unit_queue_scsi_scan(port);
 717 }
 718
 719 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 720 {
 721         struct fc_rport *rport = port->rport;
 722
 723         if (rport) {
 724                 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
 725                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 726                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 727                 fc_remote_port_delete(rport);
 728                 port->rport = NULL;
 729         }
 730 }
 731
 732 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 733 {
 734         get_device(&port->dev);
 735         port->rport_task = RPORT_ADD;
 736
 737         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 738                 put_device(&port->dev);
 739 }
 740
 741 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 742 {
 743         get_device(&port->dev);
 744         port->rport_task = RPORT_DEL;
 745
 746         if (port->rport && queue_work(port->adapter->work_queue,
 747                                       &port->rport_work))
 748                 return;
 749
 750         put_device(&port->dev);
 751 }
 752
 753 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 754 {
 755         unsigned long flags;
 756         struct zfcp_port *port;
 757
 758         read_lock_irqsave(&adapter->port_list_lock, flags);
 759         list_for_each_entry(port, &adapter->port_list, list)
 760                 zfcp_scsi_schedule_rport_block(port);
 761         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 762 }
 763
 764 void zfcp_scsi_rport_work(struct work_struct *work)
 765 {
 766         struct zfcp_port *port = container_of(work, struct zfcp_port,
 767                                               rport_work);
 768
 769         set_worker_desc("zrp%c-%16llx",
 770                         (port->rport_task == RPORT_ADD) ? 'a' : 'd',
 771                         port->wwpn); /* < WORKER_DESC_LEN=24 */
 772         while (port->rport_task) {
 773                 if (port->rport_task == RPORT_ADD) {
 774                         port->rport_task = RPORT_NONE;
 775                         zfcp_scsi_rport_register(port);
 776                 } else {
 777                         port->rport_task = RPORT_NONE;
 778                         zfcp_scsi_rport_block(port);
 779                 }
 780         }
 781
 782         put_device(&port->dev);
 783 }
 784
 785 /**
 786  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 787  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 788  */
 789 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 790 {
 791         unsigned int mask = 0;
 792         unsigned int data_div;
 793         struct Scsi_Host *shost = adapter->scsi_host;
 794
 795         data_div = atomic_read(&adapter->status) &
 796                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 797
 798         if ((enable_dif || zfcp_experimental_dix) &&
 799             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 800                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 801
 802         if (zfcp_experimental_dix && data_div &&
 803             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 804                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 805                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 806                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 807                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 808                 shost->max_sectors = shost->sg_tablesize * 8;
 809         }
 810
 811         scsi_host_set_prot(shost, mask);
 812 }
 813
 814 /**
 815  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 816  * @scmd: The SCSI command to report the error for
 817  * @ascq: The ASCQ to put in the sense buffer
 818  *
 819  * See the error handling in sd_done for the sense codes used here.
 820  * Set DID_SOFT_ERROR to retry the request, if possible.
 821  */
 822 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 823 {
 824         scsi_build_sense_buffer(1, scmd->sense_buffer,
 825                                 ILLEGAL_REQUEST, 0x10, ascq);
 826         set_driver_byte(scmd, DRIVER_SENSE);
 827         scmd->result |= SAM_STAT_CHECK_CONDITION;
 828         set_host_byte(scmd, DID_SOFT_ERROR);
 829 }
 830
 831 struct fc_function_template zfcp_transport_functions = {
 832         .show_starget_port_id = 1,
 833         .show_starget_port_name = 1,
 834         .show_starget_node_name = 1,
 835         .show_rport_supported_classes = 1,
 836         .show_rport_maxframe_size = 1,
 837         .show_rport_dev_loss_tmo = 1,
 838         .show_host_node_name = 1,
 839         .show_host_port_name = 1,
 840         .show_host_permanent_port_name = 1,
 841         .show_host_supported_classes = 1,
 842         .show_host_supported_fc4s = 1,
 843         .show_host_supported_speeds = 1,
 844         .show_host_maxframe_size = 1,
 845         .show_host_serial_number = 1,
 846         .get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
 847         .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
 848         .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
 849         .get_host_port_state = zfcp_scsi_get_host_port_state,
 850         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 851         .show_host_port_state = 1,
 852         .show_host_active_fc4s = 1,
 853         .bsg_request = zfcp_fc_exec_bsg_job,
 854         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 855         /* no functions registered for following dynamic attributes but
 856            directly set by LLDD */
 857         .show_host_port_type = 1,
 858         .show_host_symbolic_name = 1,
 859         .show_host_speed = 1,
 860         .show_host_port_id = 1,
 861         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 862 };