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         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
 372                 zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p");
 373                 zfcp_erp_wait(adapter);
 374         }
 375         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 376         zfcp_erp_wait(adapter);
 377         fc_ret = fc_block_scsi_eh(scpnt);
 378         if (fc_ret)
 379                 ret = fc_ret;
 380
 381         zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 382         return ret;
 383 }
 384
 385 /**
 386  * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
 387  * @shost: Pointer to Scsi_Host to perform action on.
 388  * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
 389  *
 390  * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
 391  *
 392  * This is similar to zfcp_sysfs_adapter_failed_store().
 393  */
 394 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
 395 {
 396         struct zfcp_adapter *adapter =
 397                 (struct zfcp_adapter *)shost->hostdata[0];
 398         int ret = 0;
 399
 400         if (reset_type != SCSI_ADAPTER_RESET) {
 401                 ret = -EOPNOTSUPP;
 402                 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
 403                 return ret;
 404         }
 405
 406         zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
 407         return ret;
 408 }
 409
 410 struct scsi_transport_template *zfcp_scsi_transport_template;
 411
 412 static struct scsi_host_template zfcp_scsi_host_template = {
 413         .module                  = THIS_MODULE,
 414         .name                    = "zfcp",
 415         .queuecommand            = zfcp_scsi_queuecommand,
 416         .eh_timed_out            = fc_eh_timed_out,
 417         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 418         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 419         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 420         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 421         .slave_alloc             = zfcp_scsi_slave_alloc,
 422         .slave_configure         = zfcp_scsi_slave_configure,
 423         .slave_destroy           = zfcp_scsi_slave_destroy,
 424         .change_queue_depth      = scsi_change_queue_depth,
 425         .host_reset              = zfcp_scsi_sysfs_host_reset,
 426         .proc_name               = "zfcp",
 427         .can_queue               = 4096,
 428         .this_id                 = -1,
 429         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 430                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 431                                    /* GCD, adjusted later */
 432         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 433                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 434                                    /* GCD, adjusted later */
 435         /* report size limit per scatter-gather segment */
 436         .max_segment_size        = ZFCP_QDIO_SBALE_LEN,
 437         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 438         .shost_attrs             = zfcp_sysfs_shost_attrs,
 439         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 440         .track_queue_depth       = 1,
 441         .supported_mode          = MODE_INITIATOR,
 442 };
 443
 444 /**
 445  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 446  * @adapter: The zfcp adapter to register with the SCSI midlayer
 447  */
 448 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 449 {
 450         struct ccw_dev_id dev_id;
 451
 452         if (adapter->scsi_host)
 453                 return 0;
 454
 455         ccw_device_get_id(adapter->ccw_device, &dev_id);
 456         /* register adapter as SCSI host with mid layer of SCSI stack */
 457         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 458                                              sizeof (struct zfcp_adapter *));
 459         if (!adapter->scsi_host) {
 460                 dev_err(&adapter->ccw_device->dev,
 461                         "Registering the FCP device with the "
 462                         "SCSI stack failed\n");
 463                 return -EIO;
 464         }
 465
 466         /* tell the SCSI stack some characteristics of this adapter */
 467         adapter->scsi_host->max_id = 511;
 468         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 469         adapter->scsi_host->max_channel = 0;
 470         adapter->scsi_host->unique_id = dev_id.devno;
 471         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 472         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 473
 474         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 475
 476         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 477                 scsi_host_put(adapter->scsi_host);
 478                 return -EIO;
 479         }
 480
 481         return 0;
 482 }
 483
 484 /**
 485  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 486  * @adapter: The zfcp adapter to unregister.
 487  */
 488 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 489 {
 490         struct Scsi_Host *shost;
 491         struct zfcp_port *port;
 492
 493         shost = adapter->scsi_host;
 494         if (!shost)
 495                 return;
 496
 497         read_lock_irq(&adapter->port_list_lock);
 498         list_for_each_entry(port, &adapter->port_list, list)
 499                 port->rport = NULL;
 500         read_unlock_irq(&adapter->port_list_lock);
 501
 502         fc_remove_host(shost);
 503         scsi_remove_host(shost);
 504         scsi_host_put(shost);
 505         adapter->scsi_host = NULL;
 506 }
 507
 508 static struct fc_host_statistics*
 509 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter)
 510 {
 511         struct fc_host_statistics *fc_stats;
 512
 513         if (!adapter->fc_stats) {
 514                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 515                 if (!fc_stats)
 516                         return NULL;
 517                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 518         }
 519         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 520         return adapter->fc_stats;
 521 }
 522
 523 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 524                                            struct fsf_qtcb_bottom_port *data,
 525                                            struct fsf_qtcb_bottom_port *old)
 526 {
 527         fc_stats->seconds_since_last_reset =
 528                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 529         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 530         fc_stats->tx_words = data->tx_words - old->tx_words;
 531         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 532         fc_stats->rx_words = data->rx_words - old->rx_words;
 533         fc_stats->lip_count = data->lip - old->lip;
 534         fc_stats->nos_count = data->nos - old->nos;
 535         fc_stats->error_frames = data->error_frames - old->error_frames;
 536         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 537         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 538         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 539         fc_stats->loss_of_signal_count =
 540                 data->loss_of_signal - old->loss_of_signal;
 541         fc_stats->prim_seq_protocol_err_count =
 542                 data->psp_error_counts - old->psp_error_counts;
 543         fc_stats->invalid_tx_word_count =
 544                 data->invalid_tx_words - old->invalid_tx_words;
 545         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 546         fc_stats->fcp_input_requests =
 547                 data->input_requests - old->input_requests;
 548         fc_stats->fcp_output_requests =
 549                 data->output_requests - old->output_requests;
 550         fc_stats->fcp_control_requests =
 551                 data->control_requests - old->control_requests;
 552         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 553         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 554 }
 555
 556 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 557                                         struct fsf_qtcb_bottom_port *data)
 558 {
 559         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 560         fc_stats->tx_frames = data->tx_frames;
 561         fc_stats->tx_words = data->tx_words;
 562         fc_stats->rx_frames = data->rx_frames;
 563         fc_stats->rx_words = data->rx_words;
 564         fc_stats->lip_count = data->lip;
 565         fc_stats->nos_count = data->nos;
 566         fc_stats->error_frames = data->error_frames;
 567         fc_stats->dumped_frames = data->dumped_frames;
 568         fc_stats->link_failure_count = data->link_failure;
 569         fc_stats->loss_of_sync_count = data->loss_of_sync;
 570         fc_stats->loss_of_signal_count = data->loss_of_signal;
 571         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 572         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 573         fc_stats->invalid_crc_count = data->invalid_crcs;
 574         fc_stats->fcp_input_requests = data->input_requests;
 575         fc_stats->fcp_output_requests = data->output_requests;
 576         fc_stats->fcp_control_requests = data->control_requests;
 577         fc_stats->fcp_input_megabytes = data->input_mb;
 578         fc_stats->fcp_output_megabytes = data->output_mb;
 579 }
 580
 581 static struct fc_host_statistics *
 582 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
 583 {
 584         struct zfcp_adapter *adapter;
 585         struct fc_host_statistics *fc_stats;
 586         struct fsf_qtcb_bottom_port *data;
 587         int ret;
 588
 589         adapter = (struct zfcp_adapter *)host->hostdata[0];
 590         fc_stats = zfcp_scsi_init_fc_host_stats(adapter);
 591         if (!fc_stats)
 592                 return NULL;
 593
 594         data = kzalloc(sizeof(*data), GFP_KERNEL);
 595         if (!data)
 596                 return NULL;
 597
 598         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 599         if (ret) {
 600                 kfree(data);
 601                 return NULL;
 602         }
 603
 604         if (adapter->stats_reset &&
 605             ((jiffies/HZ - adapter->stats_reset) <
 606              data->seconds_since_last_reset))
 607                 zfcp_scsi_adjust_fc_host_stats(fc_stats, data,
 608                                                adapter->stats_reset_data);
 609         else
 610                 zfcp_scsi_set_fc_host_stats(fc_stats, data);
 611
 612         kfree(data);
 613         return fc_stats;
 614 }
 615
 616 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
 617 {
 618         struct zfcp_adapter *adapter;
 619         struct fsf_qtcb_bottom_port *data;
 620         int ret;
 621
 622         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 623         data = kzalloc(sizeof(*data), GFP_KERNEL);
 624         if (!data)
 625                 return;
 626
 627         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 628         if (ret)
 629                 kfree(data);
 630         else {
 631                 adapter->stats_reset = jiffies/HZ;
 632                 kfree(adapter->stats_reset_data);
 633                 adapter->stats_reset_data = data; /* finally freed in
 634                                                      adapter_release */
 635         }
 636 }
 637
 638 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost)
 639 {
 640         struct zfcp_adapter *adapter =
 641                 (struct zfcp_adapter *)shost->hostdata[0];
 642         int status = atomic_read(&adapter->status);
 643
 644         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 645             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 646                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 647         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 648                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 649         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 650                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 651         else
 652                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 653 }
 654
 655 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport,
 656                                              u32 timeout)
 657 {
 658         rport->dev_loss_tmo = timeout;
 659 }
 660
 661 /**
 662  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 663  * @rport: The FC rport where to teminate I/O
 664  *
 665  * Abort all pending SCSI commands for a port by closing the
 666  * port. Using a reopen avoids a conflict with a shutdown
 667  * overwriting a reopen. The "forced" ensures that a disappeared port
 668  * is not opened again as valid due to the cached plogi data in
 669  * non-NPIV mode.
 670  */
 671 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 672 {
 673         struct zfcp_port *port;
 674         struct Scsi_Host *shost = rport_to_shost(rport);
 675         struct zfcp_adapter *adapter =
 676                 (struct zfcp_adapter *)shost->hostdata[0];
 677
 678         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 679
 680         if (port) {
 681                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 682                 put_device(&port->dev);
 683         } else {
 684                 zfcp_erp_port_forced_no_port_dbf(
 685                         "sctrpin", adapter,
 686                         rport->port_name /* zfcp_scsi_rport_register */,
 687                         rport->port_id /* zfcp_scsi_rport_register */);
 688         }
 689 }
 690
 691 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 692 {
 693         struct fc_rport_identifiers ids;
 694         struct fc_rport *rport;
 695
 696         if (port->rport)
 697                 return;
 698
 699         ids.node_name = port->wwnn;
 700         ids.port_name = port->wwpn;
 701         ids.port_id = port->d_id;
 702         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 703
 704         zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
 705                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 706                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 707         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 708         if (!rport) {
 709                 dev_err(&port->adapter->ccw_device->dev,
 710                         "Registering port 0x%016Lx failed\n",
 711                         (unsigned long long)port->wwpn);
 712                 return;
 713         }
 714
 715         rport->maxframe_size = port->maxframe_size;
 716         rport->supported_classes = port->supported_classes;
 717         port->rport = rport;
 718         port->starget_id = rport->scsi_target_id;
 719
 720         zfcp_unit_queue_scsi_scan(port);
 721 }
 722
 723 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 724 {
 725         struct fc_rport *rport = port->rport;
 726
 727         if (rport) {
 728                 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
 729                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 730                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 731                 fc_remote_port_delete(rport);
 732                 port->rport = NULL;
 733         }
 734 }
 735
 736 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 737 {
 738         get_device(&port->dev);
 739         port->rport_task = RPORT_ADD;
 740
 741         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 742                 put_device(&port->dev);
 743 }
 744
 745 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 746 {
 747         get_device(&port->dev);
 748         port->rport_task = RPORT_DEL;
 749
 750         if (port->rport && queue_work(port->adapter->work_queue,
 751                                       &port->rport_work))
 752                 return;
 753
 754         put_device(&port->dev);
 755 }
 756
 757 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 758 {
 759         unsigned long flags;
 760         struct zfcp_port *port;
 761
 762         read_lock_irqsave(&adapter->port_list_lock, flags);
 763         list_for_each_entry(port, &adapter->port_list, list)
 764                 zfcp_scsi_schedule_rport_block(port);
 765         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 766 }
 767
 768 void zfcp_scsi_rport_work(struct work_struct *work)
 769 {
 770         struct zfcp_port *port = container_of(work, struct zfcp_port,
 771                                               rport_work);
 772
 773         set_worker_desc("zrp%c-%16llx",
 774                         (port->rport_task == RPORT_ADD) ? 'a' : 'd',
 775                         port->wwpn); /* < WORKER_DESC_LEN=24 */
 776         while (port->rport_task) {
 777                 if (port->rport_task == RPORT_ADD) {
 778                         port->rport_task = RPORT_NONE;
 779                         zfcp_scsi_rport_register(port);
 780                 } else {
 781                         port->rport_task = RPORT_NONE;
 782                         zfcp_scsi_rport_block(port);
 783                 }
 784         }
 785
 786         put_device(&port->dev);
 787 }
 788
 789 /**
 790  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 791  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 792  */
 793 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 794 {
 795         unsigned int mask = 0;
 796         unsigned int data_div;
 797         struct Scsi_Host *shost = adapter->scsi_host;
 798
 799         data_div = atomic_read(&adapter->status) &
 800                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 801
 802         if ((enable_dif || zfcp_experimental_dix) &&
 803             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 804                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 805
 806         if (zfcp_experimental_dix && data_div &&
 807             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 808                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 809                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 810                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 811                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 812                 shost->max_sectors = shost->sg_tablesize * 8;
 813         }
 814
 815         scsi_host_set_prot(shost, mask);
 816 }
 817
 818 /**
 819  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 820  * @scmd: The SCSI command to report the error for
 821  * @ascq: The ASCQ to put in the sense buffer
 822  *
 823  * See the error handling in sd_done for the sense codes used here.
 824  * Set DID_SOFT_ERROR to retry the request, if possible.
 825  */
 826 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 827 {
 828         scsi_build_sense_buffer(1, scmd->sense_buffer,
 829                                 ILLEGAL_REQUEST, 0x10, ascq);
 830         set_driver_byte(scmd, DRIVER_SENSE);
 831         scmd->result |= SAM_STAT_CHECK_CONDITION;
 832         set_host_byte(scmd, DID_SOFT_ERROR);
 833 }
 834
 835 struct fc_function_template zfcp_transport_functions = {
 836         .show_starget_port_id = 1,
 837         .show_starget_port_name = 1,
 838         .show_starget_node_name = 1,
 839         .show_rport_supported_classes = 1,
 840         .show_rport_maxframe_size = 1,
 841         .show_rport_dev_loss_tmo = 1,
 842         .show_host_node_name = 1,
 843         .show_host_port_name = 1,
 844         .show_host_permanent_port_name = 1,
 845         .show_host_supported_classes = 1,
 846         .show_host_supported_fc4s = 1,
 847         .show_host_supported_speeds = 1,
 848         .show_host_maxframe_size = 1,
 849         .show_host_serial_number = 1,
 850         .get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
 851         .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
 852         .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
 853         .get_host_port_state = zfcp_scsi_get_host_port_state,
 854         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 855         .show_host_port_state = 1,
 856         .show_host_active_fc4s = 1,
 857         .bsg_request = zfcp_fc_exec_bsg_job,
 858         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 859         /* no functions registered for following dynamic attributes but
 860            directly set by LLDD */
 861         .show_host_port_type = 1,
 862         .show_host_symbolic_name = 1,
 863         .show_host_speed = 1,
 864         .show_host_port_id = 1,
 865         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 866 };