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         mutex_lock(&zfcp_sysfs_port_units_mutex);
 133         if (zfcp_sysfs_port_is_removing(port)) {
 134                 /* port is already gone */
 135                 mutex_unlock(&zfcp_sysfs_port_units_mutex);
 136                 put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
 137                 return -ENXIO;
 138         }
 139         mutex_unlock(&zfcp_sysfs_port_units_mutex);
 140
 141         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 142         if (unit)
 143                 put_device(&unit->dev);
 144
 145         if (!unit && !(allow_lun_scan && npiv)) {
 146                 put_device(&port->dev);
 147                 return -ENXIO;
 148         }
 149
 150         zfcp_sdev->port = port;
 151         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 152         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 153         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 154         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 155         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 157         spin_lock_init(&zfcp_sdev->latencies.lock);
 158
 159         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 160         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 161         zfcp_erp_wait(port->adapter);
 162
 163         return 0;
 164 }
 165
 166 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 167 {
 168         struct Scsi_Host *scsi_host = scpnt->device->host;
 169         struct zfcp_adapter *adapter =
 170                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 171         struct zfcp_fsf_req *old_req, *abrt_req;
 172         unsigned long flags;
 173         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 174         int retval = SUCCESS, ret;
 175         int retry = 3;
 176         char *dbf_tag;
 177
 178         /* avoid race condition between late normal completion and abort */
 179         write_lock_irqsave(&adapter->abort_lock, flags);
 180
 181         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 182         if (!old_req) {
 183                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 184                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 185                 return FAILED; /* completion could be in progress */
 186         }
 187         old_req->data = NULL;
 188
 189         /* don't access old fsf_req after releasing the abort_lock */
 190         write_unlock_irqrestore(&adapter->abort_lock, flags);
 191
 192         while (retry--) {
 193                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 194                 if (abrt_req)
 195                         break;
 196
 197                 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
 198                 zfcp_erp_wait(adapter);
 199                 ret = fc_block_scsi_eh(scpnt);
 200                 if (ret) {
 201                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 202                         return ret;
 203                 }
 204                 if (!(atomic_read(&adapter->status) &
 205                       ZFCP_STATUS_COMMON_RUNNING)) {
 206                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 207                         return SUCCESS;
 208                 }
 209         }
 210         if (!abrt_req) {
 211                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 212                 return FAILED;
 213         }
 214
 215         wait_for_completion(&abrt_req->completion);
 216
 217         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 218                 dbf_tag = "abrt_ok";
 219         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 220                 dbf_tag = "abrt_nn";
 221         else {
 222                 dbf_tag = "abrt_fa";
 223                 retval = FAILED;
 224         }
 225         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 226         zfcp_fsf_req_free(abrt_req);
 227         return retval;
 228 }
 229
 230 struct zfcp_scsi_req_filter {
 231         u8 tmf_scope;
 232         u32 lun_handle;
 233         u32 port_handle;
 234 };
 235
 236 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 237 {
 238         struct zfcp_scsi_req_filter *filter =
 239                 (struct zfcp_scsi_req_filter *)data;
 240
 241         /* already aborted - prevent side-effects - or not a SCSI command */
 242         if (old_req->data == NULL ||
 243             zfcp_fsf_req_is_status_read_buffer(old_req) ||
 244             old_req->qtcb->header.fsf_command != FSF_QTCB_FCP_CMND)
 245                 return;
 246
 247         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 248         if (old_req->qtcb->header.port_handle != filter->port_handle)
 249                 return;
 250
 251         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 252             old_req->qtcb->header.lun_handle != filter->lun_handle)
 253                 return;
 254
 255         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 256         old_req->data = NULL;
 257 }
 258
 259 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 260 {
 261         struct zfcp_adapter *adapter = zsdev->port->adapter;
 262         struct zfcp_scsi_req_filter filter = {
 263                 .tmf_scope = FCP_TMF_TGT_RESET,
 264                 .port_handle = zsdev->port->handle,
 265         };
 266         unsigned long flags;
 267
 268         if (tm_flags == FCP_TMF_LUN_RESET) {
 269                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 270                 filter.lun_handle = zsdev->lun_handle;
 271         }
 272
 273         /*
 274          * abort_lock secures against other processings - in the abort-function
 275          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 276          */
 277         write_lock_irqsave(&adapter->abort_lock, flags);
 278         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 279                                    &filter);
 280         write_unlock_irqrestore(&adapter->abort_lock, flags);
 281 }
 282
 283 /**
 284  * zfcp_scsi_task_mgmt_function() - Send a task management function (sync).
 285  * @sdev: Pointer to SCSI device to send the task management command to.
 286  * @tm_flags: Task management flags,
 287  *            here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
 288  */
 289 static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
 290 {
 291         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 292         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 293         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 294         struct zfcp_fsf_req *fsf_req = NULL;
 295         int retval = SUCCESS, ret;
 296         int retry = 3;
 297
 298         while (retry--) {
 299                 fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags);
 300                 if (fsf_req)
 301                         break;
 302
 303                 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
 304                 zfcp_erp_wait(adapter);
 305                 ret = fc_block_rport(rport);
 306                 if (ret) {
 307                         zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
 308                         return ret;
 309                 }
 310
 311                 if (!(atomic_read(&adapter->status) &
 312                       ZFCP_STATUS_COMMON_RUNNING)) {
 313                         zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
 314                         return SUCCESS;
 315                 }
 316         }
 317         if (!fsf_req) {
 318                 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
 319                 return FAILED;
 320         }
 321
 322         wait_for_completion(&fsf_req->completion);
 323
 324         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 325                 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
 326                 retval = FAILED;
 327         } else {
 328                 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
 329                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 330         }
 331
 332         zfcp_fsf_req_free(fsf_req);
 333         return retval;
 334 }
 335
 336 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 337 {
 338         struct scsi_device *sdev = scpnt->device;
 339
 340         return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
 341 }
 342
 343 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 344 {
 345         struct scsi_target *starget = scsi_target(scpnt->device);
 346         struct fc_rport *rport = starget_to_rport(starget);
 347         struct Scsi_Host *shost = rport_to_shost(rport);
 348         struct scsi_device *sdev = NULL, *tmp_sdev;
 349         struct zfcp_adapter *adapter =
 350                 (struct zfcp_adapter *)shost->hostdata[0];
 351         int ret;
 352
 353         shost_for_each_device(tmp_sdev, shost) {
 354                 if (tmp_sdev->id == starget->id) {
 355                         sdev = tmp_sdev;
 356                         break;
 357                 }
 358         }
 359         if (!sdev) {
 360                 ret = FAILED;
 361                 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
 362                 return ret;
 363         }
 364
 365         ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
 366
 367         /* release reference from above shost_for_each_device */
 368         if (sdev)
 369                 scsi_device_put(tmp_sdev);
 370
 371         return ret;
 372 }
 373
 374 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 375 {
 376         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 377         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 378         int ret = SUCCESS, fc_ret;
 379
 380         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
 381                 zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p");
 382                 zfcp_erp_wait(adapter);
 383         }
 384         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 385         zfcp_erp_wait(adapter);
 386         fc_ret = fc_block_scsi_eh(scpnt);
 387         if (fc_ret)
 388                 ret = fc_ret;
 389
 390         zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 391         return ret;
 392 }
 393
 394 /**
 395  * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
 396  * @shost: Pointer to Scsi_Host to perform action on.
 397  * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
 398  *
 399  * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
 400  *
 401  * This is similar to zfcp_sysfs_adapter_failed_store().
 402  */
 403 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
 404 {
 405         struct zfcp_adapter *adapter =
 406                 (struct zfcp_adapter *)shost->hostdata[0];
 407         int ret = 0;
 408
 409         if (reset_type != SCSI_ADAPTER_RESET) {
 410                 ret = -EOPNOTSUPP;
 411                 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
 412                 return ret;
 413         }
 414
 415         zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
 416         return ret;
 417 }
 418
 419 struct scsi_transport_template *zfcp_scsi_transport_template;
 420
 421 static struct scsi_host_template zfcp_scsi_host_template = {
 422         .module                  = THIS_MODULE,
 423         .name                    = "zfcp",
 424         .queuecommand            = zfcp_scsi_queuecommand,
 425         .eh_timed_out            = fc_eh_timed_out,
 426         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 427         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 428         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 429         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 430         .slave_alloc             = zfcp_scsi_slave_alloc,
 431         .slave_configure         = zfcp_scsi_slave_configure,
 432         .slave_destroy           = zfcp_scsi_slave_destroy,
 433         .change_queue_depth      = scsi_change_queue_depth,
 434         .host_reset              = zfcp_scsi_sysfs_host_reset,
 435         .proc_name               = "zfcp",
 436         .can_queue               = 4096,
 437         .this_id                 = -1,
 438         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 439                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 440                                    /* GCD, adjusted later */
 441         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 442                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 443                                    /* GCD, adjusted later */
 444         /* report size limit per scatter-gather segment */
 445         .max_segment_size        = ZFCP_QDIO_SBALE_LEN,
 446         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 447         .shost_attrs             = zfcp_sysfs_shost_attrs,
 448         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 449         .track_queue_depth       = 1,
 450         .supported_mode          = MODE_INITIATOR,
 451 };
 452
 453 /**
 454  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 455  * @adapter: The zfcp adapter to register with the SCSI midlayer
 456  */
 457 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 458 {
 459         struct ccw_dev_id dev_id;
 460
 461         if (adapter->scsi_host)
 462                 return 0;
 463
 464         ccw_device_get_id(adapter->ccw_device, &dev_id);
 465         /* register adapter as SCSI host with mid layer of SCSI stack */
 466         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 467                                              sizeof (struct zfcp_adapter *));
 468         if (!adapter->scsi_host) {
 469                 dev_err(&adapter->ccw_device->dev,
 470                         "Registering the FCP device with the "
 471                         "SCSI stack failed\n");
 472                 return -EIO;
 473         }
 474
 475         /* tell the SCSI stack some characteristics of this adapter */
 476         adapter->scsi_host->max_id = 511;
 477         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 478         adapter->scsi_host->max_channel = 0;
 479         adapter->scsi_host->unique_id = dev_id.devno;
 480         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 481         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 482
 483         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 484
 485         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 486                 scsi_host_put(adapter->scsi_host);
 487                 return -EIO;
 488         }
 489
 490         return 0;
 491 }
 492
 493 /**
 494  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 495  * @adapter: The zfcp adapter to unregister.
 496  */
 497 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 498 {
 499         struct Scsi_Host *shost;
 500         struct zfcp_port *port;
 501
 502         shost = adapter->scsi_host;
 503         if (!shost)
 504                 return;
 505
 506         read_lock_irq(&adapter->port_list_lock);
 507         list_for_each_entry(port, &adapter->port_list, list)
 508                 port->rport = NULL;
 509         read_unlock_irq(&adapter->port_list_lock);
 510
 511         fc_remove_host(shost);
 512         scsi_remove_host(shost);
 513         scsi_host_put(shost);
 514         adapter->scsi_host = NULL;
 515 }
 516
 517 static struct fc_host_statistics*
 518 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter)
 519 {
 520         struct fc_host_statistics *fc_stats;
 521
 522         if (!adapter->fc_stats) {
 523                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 524                 if (!fc_stats)
 525                         return NULL;
 526                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 527         }
 528         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 529         return adapter->fc_stats;
 530 }
 531
 532 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 533                                            struct fsf_qtcb_bottom_port *data,
 534                                            struct fsf_qtcb_bottom_port *old)
 535 {
 536         fc_stats->seconds_since_last_reset =
 537                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 538         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 539         fc_stats->tx_words = data->tx_words - old->tx_words;
 540         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 541         fc_stats->rx_words = data->rx_words - old->rx_words;
 542         fc_stats->lip_count = data->lip - old->lip;
 543         fc_stats->nos_count = data->nos - old->nos;
 544         fc_stats->error_frames = data->error_frames - old->error_frames;
 545         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 546         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 547         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 548         fc_stats->loss_of_signal_count =
 549                 data->loss_of_signal - old->loss_of_signal;
 550         fc_stats->prim_seq_protocol_err_count =
 551                 data->psp_error_counts - old->psp_error_counts;
 552         fc_stats->invalid_tx_word_count =
 553                 data->invalid_tx_words - old->invalid_tx_words;
 554         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 555         fc_stats->fcp_input_requests =
 556                 data->input_requests - old->input_requests;
 557         fc_stats->fcp_output_requests =
 558                 data->output_requests - old->output_requests;
 559         fc_stats->fcp_control_requests =
 560                 data->control_requests - old->control_requests;
 561         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 562         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 563 }
 564
 565 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 566                                         struct fsf_qtcb_bottom_port *data)
 567 {
 568         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 569         fc_stats->tx_frames = data->tx_frames;
 570         fc_stats->tx_words = data->tx_words;
 571         fc_stats->rx_frames = data->rx_frames;
 572         fc_stats->rx_words = data->rx_words;
 573         fc_stats->lip_count = data->lip;
 574         fc_stats->nos_count = data->nos;
 575         fc_stats->error_frames = data->error_frames;
 576         fc_stats->dumped_frames = data->dumped_frames;
 577         fc_stats->link_failure_count = data->link_failure;
 578         fc_stats->loss_of_sync_count = data->loss_of_sync;
 579         fc_stats->loss_of_signal_count = data->loss_of_signal;
 580         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 581         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 582         fc_stats->invalid_crc_count = data->invalid_crcs;
 583         fc_stats->fcp_input_requests = data->input_requests;
 584         fc_stats->fcp_output_requests = data->output_requests;
 585         fc_stats->fcp_control_requests = data->control_requests;
 586         fc_stats->fcp_input_megabytes = data->input_mb;
 587         fc_stats->fcp_output_megabytes = data->output_mb;
 588 }
 589
 590 static struct fc_host_statistics *
 591 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
 592 {
 593         struct zfcp_adapter *adapter;
 594         struct fc_host_statistics *fc_stats;
 595         struct fsf_qtcb_bottom_port *data;
 596         int ret;
 597
 598         adapter = (struct zfcp_adapter *)host->hostdata[0];
 599         fc_stats = zfcp_scsi_init_fc_host_stats(adapter);
 600         if (!fc_stats)
 601                 return NULL;
 602
 603         data = kzalloc(sizeof(*data), GFP_KERNEL);
 604         if (!data)
 605                 return NULL;
 606
 607         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 608         if (ret) {
 609                 kfree(data);
 610                 return NULL;
 611         }
 612
 613         if (adapter->stats_reset &&
 614             ((jiffies/HZ - adapter->stats_reset) <
 615              data->seconds_since_last_reset))
 616                 zfcp_scsi_adjust_fc_host_stats(fc_stats, data,
 617                                                adapter->stats_reset_data);
 618         else
 619                 zfcp_scsi_set_fc_host_stats(fc_stats, data);
 620
 621         kfree(data);
 622         return fc_stats;
 623 }
 624
 625 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
 626 {
 627         struct zfcp_adapter *adapter;
 628         struct fsf_qtcb_bottom_port *data;
 629         int ret;
 630
 631         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 632         data = kzalloc(sizeof(*data), GFP_KERNEL);
 633         if (!data)
 634                 return;
 635
 636         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 637         if (ret)
 638                 kfree(data);
 639         else {
 640                 adapter->stats_reset = jiffies/HZ;
 641                 kfree(adapter->stats_reset_data);
 642                 adapter->stats_reset_data = data; /* finally freed in
 643                                                      adapter_release */
 644         }
 645 }
 646
 647 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost)
 648 {
 649         struct zfcp_adapter *adapter =
 650                 (struct zfcp_adapter *)shost->hostdata[0];
 651         int status = atomic_read(&adapter->status);
 652
 653         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 654             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 655                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 656         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 657                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 658         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 659                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 660         else
 661                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 662 }
 663
 664 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport,
 665                                              u32 timeout)
 666 {
 667         rport->dev_loss_tmo = timeout;
 668 }
 669
 670 /**
 671  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 672  * @rport: The FC rport where to teminate I/O
 673  *
 674  * Abort all pending SCSI commands for a port by closing the
 675  * port. Using a reopen avoids a conflict with a shutdown
 676  * overwriting a reopen. The "forced" ensures that a disappeared port
 677  * is not opened again as valid due to the cached plogi data in
 678  * non-NPIV mode.
 679  */
 680 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 681 {
 682         struct zfcp_port *port;
 683         struct Scsi_Host *shost = rport_to_shost(rport);
 684         struct zfcp_adapter *adapter =
 685                 (struct zfcp_adapter *)shost->hostdata[0];
 686
 687         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 688
 689         if (port) {
 690                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 691                 put_device(&port->dev);
 692         } else {
 693                 zfcp_erp_port_forced_no_port_dbf(
 694                         "sctrpin", adapter,
 695                         rport->port_name /* zfcp_scsi_rport_register */,
 696                         rport->port_id /* zfcp_scsi_rport_register */);
 697         }
 698 }
 699
 700 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 701 {
 702         struct fc_rport_identifiers ids;
 703         struct fc_rport *rport;
 704
 705         if (port->rport)
 706                 return;
 707
 708         ids.node_name = port->wwnn;
 709         ids.port_name = port->wwpn;
 710         ids.port_id = port->d_id;
 711         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 712
 713         zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
 714                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 715                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 716         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 717         if (!rport) {
 718                 dev_err(&port->adapter->ccw_device->dev,
 719                         "Registering port 0x%016Lx failed\n",
 720                         (unsigned long long)port->wwpn);
 721                 return;
 722         }
 723
 724         rport->maxframe_size = port->maxframe_size;
 725         rport->supported_classes = port->supported_classes;
 726         port->rport = rport;
 727         port->starget_id = rport->scsi_target_id;
 728
 729         zfcp_unit_queue_scsi_scan(port);
 730 }
 731
 732 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 733 {
 734         struct fc_rport *rport = port->rport;
 735
 736         if (rport) {
 737                 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
 738                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 739                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 740                 fc_remote_port_delete(rport);
 741                 port->rport = NULL;
 742         }
 743 }
 744
 745 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 746 {
 747         get_device(&port->dev);
 748         port->rport_task = RPORT_ADD;
 749
 750         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 751                 put_device(&port->dev);
 752 }
 753
 754 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 755 {
 756         get_device(&port->dev);
 757         port->rport_task = RPORT_DEL;
 758
 759         if (port->rport && queue_work(port->adapter->work_queue,
 760                                       &port->rport_work))
 761                 return;
 762
 763         put_device(&port->dev);
 764 }
 765
 766 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 767 {
 768         unsigned long flags;
 769         struct zfcp_port *port;
 770
 771         read_lock_irqsave(&adapter->port_list_lock, flags);
 772         list_for_each_entry(port, &adapter->port_list, list)
 773                 zfcp_scsi_schedule_rport_block(port);
 774         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 775 }
 776
 777 void zfcp_scsi_rport_work(struct work_struct *work)
 778 {
 779         struct zfcp_port *port = container_of(work, struct zfcp_port,
 780                                               rport_work);
 781
 782         set_worker_desc("zrp%c-%16llx",
 783                         (port->rport_task == RPORT_ADD) ? 'a' : 'd',
 784                         port->wwpn); /* < WORKER_DESC_LEN=24 */
 785         while (port->rport_task) {
 786                 if (port->rport_task == RPORT_ADD) {
 787                         port->rport_task = RPORT_NONE;
 788                         zfcp_scsi_rport_register(port);
 789                 } else {
 790                         port->rport_task = RPORT_NONE;
 791                         zfcp_scsi_rport_block(port);
 792                 }
 793         }
 794
 795         put_device(&port->dev);
 796 }
 797
 798 /**
 799  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 800  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 801  */
 802 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 803 {
 804         unsigned int mask = 0;
 805         unsigned int data_div;
 806         struct Scsi_Host *shost = adapter->scsi_host;
 807
 808         data_div = atomic_read(&adapter->status) &
 809                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 810
 811         if ((enable_dif || zfcp_experimental_dix) &&
 812             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 813                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 814
 815         if (zfcp_experimental_dix && data_div &&
 816             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 817                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 818                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 819                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 820                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 821                 shost->max_sectors = shost->sg_tablesize * 8;
 822         }
 823
 824         scsi_host_set_prot(shost, mask);
 825 }
 826
 827 /**
 828  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 829  * @scmd: The SCSI command to report the error for
 830  * @ascq: The ASCQ to put in the sense buffer
 831  *
 832  * See the error handling in sd_done for the sense codes used here.
 833  * Set DID_SOFT_ERROR to retry the request, if possible.
 834  */
 835 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 836 {
 837         scsi_build_sense_buffer(1, scmd->sense_buffer,
 838                                 ILLEGAL_REQUEST, 0x10, ascq);
 839         set_driver_byte(scmd, DRIVER_SENSE);
 840         scmd->result |= SAM_STAT_CHECK_CONDITION;
 841         set_host_byte(scmd, DID_SOFT_ERROR);
 842 }
 843
 844 struct fc_function_template zfcp_transport_functions = {
 845         .show_starget_port_id = 1,
 846         .show_starget_port_name = 1,
 847         .show_starget_node_name = 1,
 848         .show_rport_supported_classes = 1,
 849         .show_rport_maxframe_size = 1,
 850         .show_rport_dev_loss_tmo = 1,
 851         .show_host_node_name = 1,
 852         .show_host_port_name = 1,
 853         .show_host_permanent_port_name = 1,
 854         .show_host_supported_classes = 1,
 855         .show_host_supported_fc4s = 1,
 856         .show_host_supported_speeds = 1,
 857         .show_host_maxframe_size = 1,
 858         .show_host_serial_number = 1,
 859         .get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
 860         .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
 861         .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
 862         .get_host_port_state = zfcp_scsi_get_host_port_state,
 863         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 864         .show_host_port_state = 1,
 865         .show_host_active_fc4s = 1,
 866         .bsg_request = zfcp_fc_exec_bsg_job,
 867         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 868         /* no functions registered for following dynamic attributes but
 869            directly set by LLDD */
 870         .show_host_port_type = 1,
 871         .show_host_symbolic_name = 1,
 872         .show_host_speed = 1,
 873         .show_host_port_id = 1,
 874         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 875 };