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, 2017
   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         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 129         if (unit)
 130                 put_device(&unit->dev);
 131
 132         if (!unit && !(allow_lun_scan && npiv)) {
 133                 put_device(&port->dev);
 134                 return -ENXIO;
 135         }
 136
 137         zfcp_sdev->port = port;
 138         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 139         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 140         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 141         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 142         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 143         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 144         spin_lock_init(&zfcp_sdev->latencies.lock);
 145
 146         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 147         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 148         zfcp_erp_wait(port->adapter);
 149
 150         return 0;
 151 }
 152
 153 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 154 {
 155         struct Scsi_Host *scsi_host = scpnt->device->host;
 156         struct zfcp_adapter *adapter =
 157                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 158         struct zfcp_fsf_req *old_req, *abrt_req;
 159         unsigned long flags;
 160         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 161         int retval = SUCCESS, ret;
 162         int retry = 3;
 163         char *dbf_tag;
 164
 165         /* avoid race condition between late normal completion and abort */
 166         write_lock_irqsave(&adapter->abort_lock, flags);
 167
 168         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 169         if (!old_req) {
 170                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 171                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 172                 return FAILED; /* completion could be in progress */
 173         }
 174         old_req->data = NULL;
 175
 176         /* don't access old fsf_req after releasing the abort_lock */
 177         write_unlock_irqrestore(&adapter->abort_lock, flags);
 178
 179         while (retry--) {
 180                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 181                 if (abrt_req)
 182                         break;
 183
 184                 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
 185                 zfcp_erp_wait(adapter);
 186                 ret = fc_block_scsi_eh(scpnt);
 187                 if (ret) {
 188                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 189                         return ret;
 190                 }
 191                 if (!(atomic_read(&adapter->status) &
 192                       ZFCP_STATUS_COMMON_RUNNING)) {
 193                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 194                         return SUCCESS;
 195                 }
 196         }
 197         if (!abrt_req) {
 198                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 199                 return FAILED;
 200         }
 201
 202         wait_for_completion(&abrt_req->completion);
 203
 204         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 205                 dbf_tag = "abrt_ok";
 206         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 207                 dbf_tag = "abrt_nn";
 208         else {
 209                 dbf_tag = "abrt_fa";
 210                 retval = FAILED;
 211         }
 212         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 213         zfcp_fsf_req_free(abrt_req);
 214         return retval;
 215 }
 216
 217 struct zfcp_scsi_req_filter {
 218         u8 tmf_scope;
 219         u32 lun_handle;
 220         u32 port_handle;
 221 };
 222
 223 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 224 {
 225         struct zfcp_scsi_req_filter *filter =
 226                 (struct zfcp_scsi_req_filter *)data;
 227
 228         /* already aborted - prevent side-effects - or not a SCSI command */
 229         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 230                 return;
 231
 232         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 233         if (old_req->qtcb->header.port_handle != filter->port_handle)
 234                 return;
 235
 236         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 237             old_req->qtcb->header.lun_handle != filter->lun_handle)
 238                 return;
 239
 240         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 241         old_req->data = NULL;
 242 }
 243
 244 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 245 {
 246         struct zfcp_adapter *adapter = zsdev->port->adapter;
 247         struct zfcp_scsi_req_filter filter = {
 248                 .tmf_scope = FCP_TMF_TGT_RESET,
 249                 .port_handle = zsdev->port->handle,
 250         };
 251         unsigned long flags;
 252
 253         if (tm_flags == FCP_TMF_LUN_RESET) {
 254                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 255                 filter.lun_handle = zsdev->lun_handle;
 256         }
 257
 258         /*
 259          * abort_lock secures against other processings - in the abort-function
 260          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 261          */
 262         write_lock_irqsave(&adapter->abort_lock, flags);
 263         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 264                                    &filter);
 265         write_unlock_irqrestore(&adapter->abort_lock, flags);
 266 }
 267
 268 /**
 269  * zfcp_task_mgmt_function() - Synchronously send a task management function.
 270  * @sdev: Pointer to SCSI device to send the task management command to.
 271  * @tm_flags: Task management flags,
 272  *            here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
 273  */
 274 static int zfcp_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
 275 {
 276         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 277         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 278         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 279         struct zfcp_fsf_req *fsf_req = NULL;
 280         int retval = SUCCESS, ret;
 281         int retry = 3;
 282
 283         while (retry--) {
 284                 fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags);
 285                 if (fsf_req)
 286                         break;
 287
 288                 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
 289                 zfcp_erp_wait(adapter);
 290                 ret = fc_block_rport(rport);
 291                 if (ret) {
 292                         zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
 293                         return ret;
 294                 }
 295
 296                 if (!(atomic_read(&adapter->status) &
 297                       ZFCP_STATUS_COMMON_RUNNING)) {
 298                         zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
 299                         return SUCCESS;
 300                 }
 301         }
 302         if (!fsf_req) {
 303                 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
 304                 return FAILED;
 305         }
 306
 307         wait_for_completion(&fsf_req->completion);
 308
 309         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 310                 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
 311                 retval = FAILED;
 312         } else {
 313                 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
 314                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 315         }
 316
 317         zfcp_fsf_req_free(fsf_req);
 318         return retval;
 319 }
 320
 321 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 322 {
 323         struct scsi_device *sdev = scpnt->device;
 324
 325         return zfcp_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
 326 }
 327
 328 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 329 {
 330         struct scsi_target *starget = scsi_target(scpnt->device);
 331         struct fc_rport *rport = starget_to_rport(starget);
 332         struct Scsi_Host *shost = rport_to_shost(rport);
 333         struct scsi_device *sdev = NULL, *tmp_sdev;
 334         struct zfcp_adapter *adapter =
 335                 (struct zfcp_adapter *)shost->hostdata[0];
 336         int ret;
 337
 338         shost_for_each_device(tmp_sdev, shost) {
 339                 if (tmp_sdev->id == starget->id) {
 340                         sdev = tmp_sdev;
 341                         break;
 342                 }
 343         }
 344         if (!sdev) {
 345                 ret = FAILED;
 346                 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
 347                 return ret;
 348         }
 349
 350         ret = zfcp_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
 351
 352         /* release reference from above shost_for_each_device */
 353         if (sdev)
 354                 scsi_device_put(tmp_sdev);
 355
 356         return ret;
 357 }
 358
 359 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 360 {
 361         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 362         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 363         int ret = SUCCESS, fc_ret;
 364
 365         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 366         zfcp_erp_wait(adapter);
 367         fc_ret = fc_block_scsi_eh(scpnt);
 368         if (fc_ret)
 369                 ret = fc_ret;
 370
 371         zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 372         return ret;
 373 }
 374
 375 struct scsi_transport_template *zfcp_scsi_transport_template;
 376
 377 static struct scsi_host_template zfcp_scsi_host_template = {
 378         .module                  = THIS_MODULE,
 379         .name                    = "zfcp",
 380         .queuecommand            = zfcp_scsi_queuecommand,
 381         .eh_timed_out            = fc_eh_timed_out,
 382         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 383         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 384         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 385         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 386         .slave_alloc             = zfcp_scsi_slave_alloc,
 387         .slave_configure         = zfcp_scsi_slave_configure,
 388         .slave_destroy           = zfcp_scsi_slave_destroy,
 389         .change_queue_depth      = scsi_change_queue_depth,
 390         .proc_name               = "zfcp",
 391         .can_queue               = 4096,
 392         .this_id                 = -1,
 393         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 394                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 395                                    /* GCD, adjusted later */
 396         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 397                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 398                                    /* GCD, adjusted later */
 399         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 400         .use_clustering          = 1,
 401         .shost_attrs             = zfcp_sysfs_shost_attrs,
 402         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 403         .track_queue_depth       = 1,
 404 };
 405
 406 /**
 407  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 408  * @adapter: The zfcp adapter to register with the SCSI midlayer
 409  */
 410 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 411 {
 412         struct ccw_dev_id dev_id;
 413
 414         if (adapter->scsi_host)
 415                 return 0;
 416
 417         ccw_device_get_id(adapter->ccw_device, &dev_id);
 418         /* register adapter as SCSI host with mid layer of SCSI stack */
 419         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 420                                              sizeof (struct zfcp_adapter *));
 421         if (!adapter->scsi_host) {
 422                 dev_err(&adapter->ccw_device->dev,
 423                         "Registering the FCP device with the "
 424                         "SCSI stack failed\n");
 425                 return -EIO;
 426         }
 427
 428         /* tell the SCSI stack some characteristics of this adapter */
 429         adapter->scsi_host->max_id = 511;
 430         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 431         adapter->scsi_host->max_channel = 0;
 432         adapter->scsi_host->unique_id = dev_id.devno;
 433         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 434         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 435
 436         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 437
 438         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 439                 scsi_host_put(adapter->scsi_host);
 440                 return -EIO;
 441         }
 442
 443         return 0;
 444 }
 445
 446 /**
 447  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 448  * @adapter: The zfcp adapter to unregister.
 449  */
 450 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 451 {
 452         struct Scsi_Host *shost;
 453         struct zfcp_port *port;
 454
 455         shost = adapter->scsi_host;
 456         if (!shost)
 457                 return;
 458
 459         read_lock_irq(&adapter->port_list_lock);
 460         list_for_each_entry(port, &adapter->port_list, list)
 461                 port->rport = NULL;
 462         read_unlock_irq(&adapter->port_list_lock);
 463
 464         fc_remove_host(shost);
 465         scsi_remove_host(shost);
 466         scsi_host_put(shost);
 467         adapter->scsi_host = NULL;
 468 }
 469
 470 static struct fc_host_statistics*
 471 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 472 {
 473         struct fc_host_statistics *fc_stats;
 474
 475         if (!adapter->fc_stats) {
 476                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 477                 if (!fc_stats)
 478                         return NULL;
 479                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 480         }
 481         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 482         return adapter->fc_stats;
 483 }
 484
 485 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 486                                       struct fsf_qtcb_bottom_port *data,
 487                                       struct fsf_qtcb_bottom_port *old)
 488 {
 489         fc_stats->seconds_since_last_reset =
 490                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 491         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 492         fc_stats->tx_words = data->tx_words - old->tx_words;
 493         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 494         fc_stats->rx_words = data->rx_words - old->rx_words;
 495         fc_stats->lip_count = data->lip - old->lip;
 496         fc_stats->nos_count = data->nos - old->nos;
 497         fc_stats->error_frames = data->error_frames - old->error_frames;
 498         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 499         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 500         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 501         fc_stats->loss_of_signal_count =
 502                 data->loss_of_signal - old->loss_of_signal;
 503         fc_stats->prim_seq_protocol_err_count =
 504                 data->psp_error_counts - old->psp_error_counts;
 505         fc_stats->invalid_tx_word_count =
 506                 data->invalid_tx_words - old->invalid_tx_words;
 507         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 508         fc_stats->fcp_input_requests =
 509                 data->input_requests - old->input_requests;
 510         fc_stats->fcp_output_requests =
 511                 data->output_requests - old->output_requests;
 512         fc_stats->fcp_control_requests =
 513                 data->control_requests - old->control_requests;
 514         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 515         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 516 }
 517
 518 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 519                                    struct fsf_qtcb_bottom_port *data)
 520 {
 521         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 522         fc_stats->tx_frames = data->tx_frames;
 523         fc_stats->tx_words = data->tx_words;
 524         fc_stats->rx_frames = data->rx_frames;
 525         fc_stats->rx_words = data->rx_words;
 526         fc_stats->lip_count = data->lip;
 527         fc_stats->nos_count = data->nos;
 528         fc_stats->error_frames = data->error_frames;
 529         fc_stats->dumped_frames = data->dumped_frames;
 530         fc_stats->link_failure_count = data->link_failure;
 531         fc_stats->loss_of_sync_count = data->loss_of_sync;
 532         fc_stats->loss_of_signal_count = data->loss_of_signal;
 533         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 534         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 535         fc_stats->invalid_crc_count = data->invalid_crcs;
 536         fc_stats->fcp_input_requests = data->input_requests;
 537         fc_stats->fcp_output_requests = data->output_requests;
 538         fc_stats->fcp_control_requests = data->control_requests;
 539         fc_stats->fcp_input_megabytes = data->input_mb;
 540         fc_stats->fcp_output_megabytes = data->output_mb;
 541 }
 542
 543 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 544 {
 545         struct zfcp_adapter *adapter;
 546         struct fc_host_statistics *fc_stats;
 547         struct fsf_qtcb_bottom_port *data;
 548         int ret;
 549
 550         adapter = (struct zfcp_adapter *)host->hostdata[0];
 551         fc_stats = zfcp_init_fc_host_stats(adapter);
 552         if (!fc_stats)
 553                 return NULL;
 554
 555         data = kzalloc(sizeof(*data), GFP_KERNEL);
 556         if (!data)
 557                 return NULL;
 558
 559         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 560         if (ret) {
 561                 kfree(data);
 562                 return NULL;
 563         }
 564
 565         if (adapter->stats_reset &&
 566             ((jiffies/HZ - adapter->stats_reset) <
 567              data->seconds_since_last_reset))
 568                 zfcp_adjust_fc_host_stats(fc_stats, data,
 569                                           adapter->stats_reset_data);
 570         else
 571                 zfcp_set_fc_host_stats(fc_stats, data);
 572
 573         kfree(data);
 574         return fc_stats;
 575 }
 576
 577 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 578 {
 579         struct zfcp_adapter *adapter;
 580         struct fsf_qtcb_bottom_port *data;
 581         int ret;
 582
 583         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 584         data = kzalloc(sizeof(*data), GFP_KERNEL);
 585         if (!data)
 586                 return;
 587
 588         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 589         if (ret)
 590                 kfree(data);
 591         else {
 592                 adapter->stats_reset = jiffies/HZ;
 593                 kfree(adapter->stats_reset_data);
 594                 adapter->stats_reset_data = data; /* finally freed in
 595                                                      adapter_release */
 596         }
 597 }
 598
 599 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 600 {
 601         struct zfcp_adapter *adapter =
 602                 (struct zfcp_adapter *)shost->hostdata[0];
 603         int status = atomic_read(&adapter->status);
 604
 605         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 606             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 607                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 608         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 609                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 610         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 611                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 612         else
 613                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 614 }
 615
 616 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 617 {
 618         rport->dev_loss_tmo = timeout;
 619 }
 620
 621 /**
 622  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 623  * @rport: The FC rport where to teminate I/O
 624  *
 625  * Abort all pending SCSI commands for a port by closing the
 626  * port. Using a reopen avoids a conflict with a shutdown
 627  * overwriting a reopen. The "forced" ensures that a disappeared port
 628  * is not opened again as valid due to the cached plogi data in
 629  * non-NPIV mode.
 630  */
 631 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 632 {
 633         struct zfcp_port *port;
 634         struct Scsi_Host *shost = rport_to_shost(rport);
 635         struct zfcp_adapter *adapter =
 636                 (struct zfcp_adapter *)shost->hostdata[0];
 637
 638         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 639
 640         if (port) {
 641                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 642                 put_device(&port->dev);
 643         } else {
 644                 zfcp_erp_port_forced_no_port_dbf(
 645                         "sctrpin", adapter,
 646                         rport->port_name /* zfcp_scsi_rport_register */,
 647                         rport->port_id /* zfcp_scsi_rport_register */);
 648         }
 649 }
 650
 651 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 652 {
 653         struct fc_rport_identifiers ids;
 654         struct fc_rport *rport;
 655
 656         if (port->rport)
 657                 return;
 658
 659         ids.node_name = port->wwnn;
 660         ids.port_name = port->wwpn;
 661         ids.port_id = port->d_id;
 662         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 663
 664         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 665                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 666                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 667         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 668         if (!rport) {
 669                 dev_err(&port->adapter->ccw_device->dev,
 670                         "Registering port 0x%016Lx failed\n",
 671                         (unsigned long long)port->wwpn);
 672                 return;
 673         }
 674
 675         rport->maxframe_size = port->maxframe_size;
 676         rport->supported_classes = port->supported_classes;
 677         port->rport = rport;
 678         port->starget_id = rport->scsi_target_id;
 679
 680         zfcp_unit_queue_scsi_scan(port);
 681 }
 682
 683 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 684 {
 685         struct fc_rport *rport = port->rport;
 686
 687         if (rport) {
 688                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 689                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 690                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 691                 fc_remote_port_delete(rport);
 692                 port->rport = NULL;
 693         }
 694 }
 695
 696 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 697 {
 698         get_device(&port->dev);
 699         port->rport_task = RPORT_ADD;
 700
 701         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 702                 put_device(&port->dev);
 703 }
 704
 705 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 706 {
 707         get_device(&port->dev);
 708         port->rport_task = RPORT_DEL;
 709
 710         if (port->rport && queue_work(port->adapter->work_queue,
 711                                       &port->rport_work))
 712                 return;
 713
 714         put_device(&port->dev);
 715 }
 716
 717 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 718 {
 719         unsigned long flags;
 720         struct zfcp_port *port;
 721
 722         read_lock_irqsave(&adapter->port_list_lock, flags);
 723         list_for_each_entry(port, &adapter->port_list, list)
 724                 zfcp_scsi_schedule_rport_block(port);
 725         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 726 }
 727
 728 void zfcp_scsi_rport_work(struct work_struct *work)
 729 {
 730         struct zfcp_port *port = container_of(work, struct zfcp_port,
 731                                               rport_work);
 732
 733         set_worker_desc("zrp%c-%16llx",
 734                         (port->rport_task == RPORT_ADD) ? 'a' : 'd',
 735                         port->wwpn); /* < WORKER_DESC_LEN=24 */
 736         while (port->rport_task) {
 737                 if (port->rport_task == RPORT_ADD) {
 738                         port->rport_task = RPORT_NONE;
 739                         zfcp_scsi_rport_register(port);
 740                 } else {
 741                         port->rport_task = RPORT_NONE;
 742                         zfcp_scsi_rport_block(port);
 743                 }
 744         }
 745
 746         put_device(&port->dev);
 747 }
 748
 749 /**
 750  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 751  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 752  */
 753 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 754 {
 755         unsigned int mask = 0;
 756         unsigned int data_div;
 757         struct Scsi_Host *shost = adapter->scsi_host;
 758
 759         data_div = atomic_read(&adapter->status) &
 760                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 761
 762         if (enable_dif &&
 763             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 764                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 765
 766         if (enable_dif && data_div &&
 767             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 768                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 769                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 770                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 771                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 772                 shost->max_sectors = shost->sg_tablesize * 8;
 773         }
 774
 775         scsi_host_set_prot(shost, mask);
 776 }
 777
 778 /**
 779  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 780  * @scmd: The SCSI command to report the error for
 781  * @ascq: The ASCQ to put in the sense buffer
 782  *
 783  * See the error handling in sd_done for the sense codes used here.
 784  * Set DID_SOFT_ERROR to retry the request, if possible.
 785  */
 786 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 787 {
 788         scsi_build_sense_buffer(1, scmd->sense_buffer,
 789                                 ILLEGAL_REQUEST, 0x10, ascq);
 790         set_driver_byte(scmd, DRIVER_SENSE);
 791         scmd->result |= SAM_STAT_CHECK_CONDITION;
 792         set_host_byte(scmd, DID_SOFT_ERROR);
 793 }
 794
 795 struct fc_function_template zfcp_transport_functions = {
 796         .show_starget_port_id = 1,
 797         .show_starget_port_name = 1,
 798         .show_starget_node_name = 1,
 799         .show_rport_supported_classes = 1,
 800         .show_rport_maxframe_size = 1,
 801         .show_rport_dev_loss_tmo = 1,
 802         .show_host_node_name = 1,
 803         .show_host_port_name = 1,
 804         .show_host_permanent_port_name = 1,
 805         .show_host_supported_classes = 1,
 806         .show_host_supported_fc4s = 1,
 807         .show_host_supported_speeds = 1,
 808         .show_host_maxframe_size = 1,
 809         .show_host_serial_number = 1,
 810         .get_fc_host_stats = zfcp_get_fc_host_stats,
 811         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 812         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 813         .get_host_port_state = zfcp_get_host_port_state,
 814         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 815         .show_host_port_state = 1,
 816         .show_host_active_fc4s = 1,
 817         .bsg_request = zfcp_fc_exec_bsg_job,
 818         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 819         /* no functions registered for following dynamic attributes but
 820            directly set by LLDD */
 821         .show_host_port_type = 1,
 822         .show_host_symbolic_name = 1,
 823         .show_host_speed = 1,
 824         .show_host_port_id = 1,
 825         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 826 };