drivers/s390/scsi/zfcp_scsi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Interface to Linux SCSI midlayer.
   6  *
   7  * Copyright IBM Corp. 2002, 2018
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/slab.h>
  16 #include <scsi/fc/fc_fcp.h>
  17 #include <scsi/scsi_eh.h>
  18 #include <linux/atomic.h>
  19 #include "zfcp_ext.h"
  20 #include "zfcp_dbf.h"
  21 #include "zfcp_fc.h"
  22 #include "zfcp_reqlist.h"
  23
  24 static unsigned int default_depth = 32;
  25 module_param_named(queue_depth, default_depth, uint, 0600);
  26 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  27
  28 static bool enable_dif;
  29 module_param_named(dif, enable_dif, bool, 0400);
  30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  31
  32 static bool allow_lun_scan = true;
  33 module_param(allow_lun_scan, bool, 0600);
  34 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  35
  36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  37 {
  38         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  39
  40         /* if previous slave_alloc returned early, there is nothing to do */
  41         if (!zfcp_sdev->port)
  42                 return;
  43
  44         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  45         put_device(&zfcp_sdev->port->dev);
  46 }
  47
  48 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  49 {
  50         if (sdp->tagged_supported)
  51                 scsi_change_queue_depth(sdp, default_depth);
  52         return 0;
  53 }
  54
  55 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  56 {
  57         set_host_byte(scpnt, result);
  58         zfcp_dbf_scsi_fail_send(scpnt);
  59         scpnt->scsi_done(scpnt);
  60 }
  61
  62 static
  63 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  64 {
  65         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  66         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  67         int    status, scsi_result, ret;
  68
  69         /* reset the status for this request */
  70         scpnt->result = 0;
  71         scpnt->host_scribble = NULL;
  72
  73         scsi_result = fc_remote_port_chkready(rport);
  74         if (unlikely(scsi_result)) {
  75                 scpnt->result = scsi_result;
  76                 zfcp_dbf_scsi_fail_send(scpnt);
  77                 scpnt->scsi_done(scpnt);
  78                 return 0;
  79         }
  80
  81         status = atomic_read(&zfcp_sdev->status);
  82         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  83                      !(atomic_read(&zfcp_sdev->port->status) &
  84                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
  85                 /* only LUN access denied, but port is good
  86                  * not covered by FC transport, have to fail here */
  87                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  88                 return 0;
  89         }
  90
  91         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  92                 /* This could be
  93                  * call to rport_delete pending: mimic retry from
  94                  *      fc_remote_port_chkready until rport is BLOCKED
  95                  */
  96                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
  97                 return 0;
  98         }
  99
 100         ret = zfcp_fsf_fcp_cmnd(scpnt);
 101         if (unlikely(ret == -EBUSY))
 102                 return SCSI_MLQUEUE_DEVICE_BUSY;
 103         else if (unlikely(ret < 0))
 104                 return SCSI_MLQUEUE_HOST_BUSY;
 105
 106         return ret;
 107 }
 108
 109 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 110 {
 111         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 112         struct zfcp_adapter *adapter =
 113                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 114         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 115         struct zfcp_port *port;
 116         struct zfcp_unit *unit;
 117         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 118
 119         zfcp_sdev->erp_action.adapter = adapter;
 120         zfcp_sdev->erp_action.sdev = sdev;
 121
 122         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 123         if (!port)
 124                 return -ENXIO;
 125
 126         zfcp_sdev->erp_action.port = port;
 127
 128         mutex_lock(&zfcp_sysfs_port_units_mutex);
 129         if (zfcp_sysfs_port_is_removing(port)) {
 130                 /* port is already gone */
 131                 mutex_unlock(&zfcp_sysfs_port_units_mutex);
 132                 put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
 133                 return -ENXIO;
 134         }
 135         mutex_unlock(&zfcp_sysfs_port_units_mutex);
 136
 137         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 138         if (unit)
 139                 put_device(&unit->dev);
 140
 141         if (!unit && !(allow_lun_scan && npiv)) {
 142                 put_device(&port->dev);
 143                 return -ENXIO;
 144         }
 145
 146         zfcp_sdev->port = port;
 147         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 148         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 149         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 150         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 151         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 152         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 153         spin_lock_init(&zfcp_sdev->latencies.lock);
 154
 155         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 156         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 157         zfcp_erp_wait(port->adapter);
 158
 159         return 0;
 160 }
 161
 162 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 163 {
 164         struct Scsi_Host *scsi_host = scpnt->device->host;
 165         struct zfcp_adapter *adapter =
 166                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 167         struct zfcp_fsf_req *old_req, *abrt_req;
 168         unsigned long flags;
 169         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 170         int retval = SUCCESS, ret;
 171         int retry = 3;
 172         char *dbf_tag;
 173
 174         /* avoid race condition between late normal completion and abort */
 175         write_lock_irqsave(&adapter->abort_lock, flags);
 176
 177         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 178         if (!old_req) {
 179                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 180                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 181                 return FAILED; /* completion could be in progress */
 182         }
 183         old_req->data = NULL;
 184
 185         /* don't access old fsf_req after releasing the abort_lock */
 186         write_unlock_irqrestore(&adapter->abort_lock, flags);
 187
 188         while (retry--) {
 189                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 190                 if (abrt_req)
 191                         break;
 192
 193                 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
 194                 zfcp_erp_wait(adapter);
 195                 ret = fc_block_scsi_eh(scpnt);
 196                 if (ret) {
 197                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 198                         return ret;
 199                 }
 200                 if (!(atomic_read(&adapter->status) &
 201                       ZFCP_STATUS_COMMON_RUNNING)) {
 202                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 203                         return SUCCESS;
 204                 }
 205         }
 206         if (!abrt_req) {
 207                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 208                 return FAILED;
 209         }
 210
 211         wait_for_completion(&abrt_req->completion);
 212
 213         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 214                 dbf_tag = "abrt_ok";
 215         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 216                 dbf_tag = "abrt_nn";
 217         else {
 218                 dbf_tag = "abrt_fa";
 219                 retval = FAILED;
 220         }
 221         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 222         zfcp_fsf_req_free(abrt_req);
 223         return retval;
 224 }
 225
 226 struct zfcp_scsi_req_filter {
 227         u8 tmf_scope;
 228         u32 lun_handle;
 229         u32 port_handle;
 230 };
 231
 232 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 233 {
 234         struct zfcp_scsi_req_filter *filter =
 235                 (struct zfcp_scsi_req_filter *)data;
 236
 237         /* already aborted - prevent side-effects - or not a SCSI command */
 238         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 239                 return;
 240
 241         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 242         if (old_req->qtcb->header.port_handle != filter->port_handle)
 243                 return;
 244
 245         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 246             old_req->qtcb->header.lun_handle != filter->lun_handle)
 247                 return;
 248
 249         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 250         old_req->data = NULL;
 251 }
 252
 253 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 254 {
 255         struct zfcp_adapter *adapter = zsdev->port->adapter;
 256         struct zfcp_scsi_req_filter filter = {
 257                 .tmf_scope = FCP_TMF_TGT_RESET,
 258                 .port_handle = zsdev->port->handle,
 259         };
 260         unsigned long flags;
 261
 262         if (tm_flags == FCP_TMF_LUN_RESET) {
 263                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 264                 filter.lun_handle = zsdev->lun_handle;
 265         }
 266
 267         /*
 268          * abort_lock secures against other processings - in the abort-function
 269          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 270          */
 271         write_lock_irqsave(&adapter->abort_lock, flags);
 272         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 273                                    &filter);
 274         write_unlock_irqrestore(&adapter->abort_lock, flags);
 275 }
 276
 277 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 278 {
 279         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 280         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 281         struct zfcp_fsf_req *fsf_req = NULL;
 282         int retval = SUCCESS, ret;
 283         int retry = 3;
 284
 285         while (retry--) {
 286                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 287                 if (fsf_req)
 288                         break;
 289
 290                 zfcp_dbf_scsi_devreset("wait", scpnt, tm_flags, NULL);
 291                 zfcp_erp_wait(adapter);
 292                 ret = fc_block_scsi_eh(scpnt);
 293                 if (ret) {
 294                         zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL);
 295                         return ret;
 296                 }
 297
 298                 if (!(atomic_read(&adapter->status) &
 299                       ZFCP_STATUS_COMMON_RUNNING)) {
 300                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL);
 301                         return SUCCESS;
 302                 }
 303         }
 304         if (!fsf_req) {
 305                 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL);
 306                 return FAILED;
 307         }
 308
 309         wait_for_completion(&fsf_req->completion);
 310
 311         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 312                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req);
 313                 retval = FAILED;
 314         } else {
 315                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req);
 316                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 317         }
 318
 319         zfcp_fsf_req_free(fsf_req);
 320         return retval;
 321 }
 322
 323 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 324 {
 325         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 326 }
 327
 328 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 329 {
 330         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 331 }
 332
 333 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 334 {
 335         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 336         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 337         int ret = SUCCESS, fc_ret;
 338
 339         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
 340                 zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p");
 341                 zfcp_erp_wait(adapter);
 342         }
 343         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 344         zfcp_erp_wait(adapter);
 345         fc_ret = fc_block_scsi_eh(scpnt);
 346         if (fc_ret)
 347                 ret = fc_ret;
 348
 349         zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 350         return ret;
 351 }
 352
 353 struct scsi_transport_template *zfcp_scsi_transport_template;
 354
 355 static struct scsi_host_template zfcp_scsi_host_template = {
 356         .module                  = THIS_MODULE,
 357         .name                    = "zfcp",
 358         .queuecommand            = zfcp_scsi_queuecommand,
 359         .eh_timed_out            = fc_eh_timed_out,
 360         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 361         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 362         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 363         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 364         .slave_alloc             = zfcp_scsi_slave_alloc,
 365         .slave_configure         = zfcp_scsi_slave_configure,
 366         .slave_destroy           = zfcp_scsi_slave_destroy,
 367         .change_queue_depth      = scsi_change_queue_depth,
 368         .proc_name               = "zfcp",
 369         .can_queue               = 4096,
 370         .this_id                 = -1,
 371         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 372                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 373                                    /* GCD, adjusted later */
 374         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 375                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 376                                    /* GCD, adjusted later */
 377         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 378         .use_clustering          = 1,
 379         .shost_attrs             = zfcp_sysfs_shost_attrs,
 380         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 381         .track_queue_depth       = 1,
 382 };
 383
 384 /**
 385  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 386  * @adapter: The zfcp adapter to register with the SCSI midlayer
 387  */
 388 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 389 {
 390         struct ccw_dev_id dev_id;
 391
 392         if (adapter->scsi_host)
 393                 return 0;
 394
 395         ccw_device_get_id(adapter->ccw_device, &dev_id);
 396         /* register adapter as SCSI host with mid layer of SCSI stack */
 397         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 398                                              sizeof (struct zfcp_adapter *));
 399         if (!adapter->scsi_host) {
 400                 dev_err(&adapter->ccw_device->dev,
 401                         "Registering the FCP device with the "
 402                         "SCSI stack failed\n");
 403                 return -EIO;
 404         }
 405
 406         /* tell the SCSI stack some characteristics of this adapter */
 407         adapter->scsi_host->max_id = 511;
 408         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 409         adapter->scsi_host->max_channel = 0;
 410         adapter->scsi_host->unique_id = dev_id.devno;
 411         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 412         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 413
 414         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 415
 416         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 417                 scsi_host_put(adapter->scsi_host);
 418                 return -EIO;
 419         }
 420
 421         return 0;
 422 }
 423
 424 /**
 425  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 426  * @adapter: The zfcp adapter to unregister.
 427  */
 428 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 429 {
 430         struct Scsi_Host *shost;
 431         struct zfcp_port *port;
 432
 433         shost = adapter->scsi_host;
 434         if (!shost)
 435                 return;
 436
 437         read_lock_irq(&adapter->port_list_lock);
 438         list_for_each_entry(port, &adapter->port_list, list)
 439                 port->rport = NULL;
 440         read_unlock_irq(&adapter->port_list_lock);
 441
 442         fc_remove_host(shost);
 443         scsi_remove_host(shost);
 444         scsi_host_put(shost);
 445         adapter->scsi_host = NULL;
 446 }
 447
 448 static struct fc_host_statistics*
 449 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 450 {
 451         struct fc_host_statistics *fc_stats;
 452
 453         if (!adapter->fc_stats) {
 454                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 455                 if (!fc_stats)
 456                         return NULL;
 457                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 458         }
 459         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 460         return adapter->fc_stats;
 461 }
 462
 463 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 464                                       struct fsf_qtcb_bottom_port *data,
 465                                       struct fsf_qtcb_bottom_port *old)
 466 {
 467         fc_stats->seconds_since_last_reset =
 468                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 469         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 470         fc_stats->tx_words = data->tx_words - old->tx_words;
 471         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 472         fc_stats->rx_words = data->rx_words - old->rx_words;
 473         fc_stats->lip_count = data->lip - old->lip;
 474         fc_stats->nos_count = data->nos - old->nos;
 475         fc_stats->error_frames = data->error_frames - old->error_frames;
 476         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 477         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 478         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 479         fc_stats->loss_of_signal_count =
 480                 data->loss_of_signal - old->loss_of_signal;
 481         fc_stats->prim_seq_protocol_err_count =
 482                 data->psp_error_counts - old->psp_error_counts;
 483         fc_stats->invalid_tx_word_count =
 484                 data->invalid_tx_words - old->invalid_tx_words;
 485         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 486         fc_stats->fcp_input_requests =
 487                 data->input_requests - old->input_requests;
 488         fc_stats->fcp_output_requests =
 489                 data->output_requests - old->output_requests;
 490         fc_stats->fcp_control_requests =
 491                 data->control_requests - old->control_requests;
 492         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 493         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 494 }
 495
 496 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 497                                    struct fsf_qtcb_bottom_port *data)
 498 {
 499         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 500         fc_stats->tx_frames = data->tx_frames;
 501         fc_stats->tx_words = data->tx_words;
 502         fc_stats->rx_frames = data->rx_frames;
 503         fc_stats->rx_words = data->rx_words;
 504         fc_stats->lip_count = data->lip;
 505         fc_stats->nos_count = data->nos;
 506         fc_stats->error_frames = data->error_frames;
 507         fc_stats->dumped_frames = data->dumped_frames;
 508         fc_stats->link_failure_count = data->link_failure;
 509         fc_stats->loss_of_sync_count = data->loss_of_sync;
 510         fc_stats->loss_of_signal_count = data->loss_of_signal;
 511         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 512         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 513         fc_stats->invalid_crc_count = data->invalid_crcs;
 514         fc_stats->fcp_input_requests = data->input_requests;
 515         fc_stats->fcp_output_requests = data->output_requests;
 516         fc_stats->fcp_control_requests = data->control_requests;
 517         fc_stats->fcp_input_megabytes = data->input_mb;
 518         fc_stats->fcp_output_megabytes = data->output_mb;
 519 }
 520
 521 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 522 {
 523         struct zfcp_adapter *adapter;
 524         struct fc_host_statistics *fc_stats;
 525         struct fsf_qtcb_bottom_port *data;
 526         int ret;
 527
 528         adapter = (struct zfcp_adapter *)host->hostdata[0];
 529         fc_stats = zfcp_init_fc_host_stats(adapter);
 530         if (!fc_stats)
 531                 return NULL;
 532
 533         data = kzalloc(sizeof(*data), GFP_KERNEL);
 534         if (!data)
 535                 return NULL;
 536
 537         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 538         if (ret) {
 539                 kfree(data);
 540                 return NULL;
 541         }
 542
 543         if (adapter->stats_reset &&
 544             ((jiffies/HZ - adapter->stats_reset) <
 545              data->seconds_since_last_reset))
 546                 zfcp_adjust_fc_host_stats(fc_stats, data,
 547                                           adapter->stats_reset_data);
 548         else
 549                 zfcp_set_fc_host_stats(fc_stats, data);
 550
 551         kfree(data);
 552         return fc_stats;
 553 }
 554
 555 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 556 {
 557         struct zfcp_adapter *adapter;
 558         struct fsf_qtcb_bottom_port *data;
 559         int ret;
 560
 561         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 562         data = kzalloc(sizeof(*data), GFP_KERNEL);
 563         if (!data)
 564                 return;
 565
 566         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 567         if (ret)
 568                 kfree(data);
 569         else {
 570                 adapter->stats_reset = jiffies/HZ;
 571                 kfree(adapter->stats_reset_data);
 572                 adapter->stats_reset_data = data; /* finally freed in
 573                                                      adapter_release */
 574         }
 575 }
 576
 577 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 578 {
 579         struct zfcp_adapter *adapter =
 580                 (struct zfcp_adapter *)shost->hostdata[0];
 581         int status = atomic_read(&adapter->status);
 582
 583         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 584             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 585                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 586         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 587                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 588         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 589                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 590         else
 591                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 592 }
 593
 594 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 595 {
 596         rport->dev_loss_tmo = timeout;
 597 }
 598
 599 /**
 600  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 601  * @rport: The FC rport where to teminate I/O
 602  *
 603  * Abort all pending SCSI commands for a port by closing the
 604  * port. Using a reopen avoids a conflict with a shutdown
 605  * overwriting a reopen. The "forced" ensures that a disappeared port
 606  * is not opened again as valid due to the cached plogi data in
 607  * non-NPIV mode.
 608  */
 609 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 610 {
 611         struct zfcp_port *port;
 612         struct Scsi_Host *shost = rport_to_shost(rport);
 613         struct zfcp_adapter *adapter =
 614                 (struct zfcp_adapter *)shost->hostdata[0];
 615
 616         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 617
 618         if (port) {
 619                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 620                 put_device(&port->dev);
 621         } else {
 622                 zfcp_erp_port_forced_no_port_dbf(
 623                         "sctrpin", adapter,
 624                         rport->port_name /* zfcp_scsi_rport_register */,
 625                         rport->port_id /* zfcp_scsi_rport_register */);
 626         }
 627 }
 628
 629 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 630 {
 631         struct fc_rport_identifiers ids;
 632         struct fc_rport *rport;
 633
 634         if (port->rport)
 635                 return;
 636
 637         ids.node_name = port->wwnn;
 638         ids.port_name = port->wwpn;
 639         ids.port_id = port->d_id;
 640         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 641
 642         zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
 643                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 644                                ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 645         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 646         if (!rport) {
 647                 dev_err(&port->adapter->ccw_device->dev,
 648                         "Registering port 0x%016Lx failed\n",
 649                         (unsigned long long)port->wwpn);
 650                 return;
 651         }
 652
 653         rport->maxframe_size = port->maxframe_size;
 654         rport->supported_classes = port->supported_classes;
 655         port->rport = rport;
 656         port->starget_id = rport->scsi_target_id;
 657
 658         zfcp_unit_queue_scsi_scan(port);
 659 }
 660
 661 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 662 {
 663         struct fc_rport *rport = port->rport;
 664
 665         if (rport) {
 666                 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
 667                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 668                                        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 669                 fc_remote_port_delete(rport);
 670                 port->rport = NULL;
 671         }
 672 }
 673
 674 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 675 {
 676         get_device(&port->dev);
 677         port->rport_task = RPORT_ADD;
 678
 679         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 680                 put_device(&port->dev);
 681 }
 682
 683 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 684 {
 685         get_device(&port->dev);
 686         port->rport_task = RPORT_DEL;
 687
 688         if (port->rport && queue_work(port->adapter->work_queue,
 689                                       &port->rport_work))
 690                 return;
 691
 692         put_device(&port->dev);
 693 }
 694
 695 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 696 {
 697         unsigned long flags;
 698         struct zfcp_port *port;
 699
 700         read_lock_irqsave(&adapter->port_list_lock, flags);
 701         list_for_each_entry(port, &adapter->port_list, list)
 702                 zfcp_scsi_schedule_rport_block(port);
 703         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 704 }
 705
 706 void zfcp_scsi_rport_work(struct work_struct *work)
 707 {
 708         struct zfcp_port *port = container_of(work, struct zfcp_port,
 709                                               rport_work);
 710
 711         while (port->rport_task) {
 712                 if (port->rport_task == RPORT_ADD) {
 713                         port->rport_task = RPORT_NONE;
 714                         zfcp_scsi_rport_register(port);
 715                 } else {
 716                         port->rport_task = RPORT_NONE;
 717                         zfcp_scsi_rport_block(port);
 718                 }
 719         }
 720
 721         put_device(&port->dev);
 722 }
 723
 724 /**
 725  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 726  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 727  */
 728 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 729 {
 730         unsigned int mask = 0;
 731         unsigned int data_div;
 732         struct Scsi_Host *shost = adapter->scsi_host;
 733
 734         data_div = atomic_read(&adapter->status) &
 735                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 736
 737         if (enable_dif &&
 738             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 739                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 740
 741         if (enable_dif && data_div &&
 742             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 743                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 744                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 745                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 746                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 747                 shost->max_sectors = shost->sg_tablesize * 8;
 748         }
 749
 750         scsi_host_set_prot(shost, mask);
 751 }
 752
 753 /**
 754  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 755  * @scmd: The SCSI command to report the error for
 756  * @ascq: The ASCQ to put in the sense buffer
 757  *
 758  * See the error handling in sd_done for the sense codes used here.
 759  * Set DID_SOFT_ERROR to retry the request, if possible.
 760  */
 761 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 762 {
 763         scsi_build_sense_buffer(1, scmd->sense_buffer,
 764                                 ILLEGAL_REQUEST, 0x10, ascq);
 765         set_driver_byte(scmd, DRIVER_SENSE);
 766         scmd->result |= SAM_STAT_CHECK_CONDITION;
 767         set_host_byte(scmd, DID_SOFT_ERROR);
 768 }
 769
 770 struct fc_function_template zfcp_transport_functions = {
 771         .show_starget_port_id = 1,
 772         .show_starget_port_name = 1,
 773         .show_starget_node_name = 1,
 774         .show_rport_supported_classes = 1,
 775         .show_rport_maxframe_size = 1,
 776         .show_rport_dev_loss_tmo = 1,
 777         .show_host_node_name = 1,
 778         .show_host_port_name = 1,
 779         .show_host_permanent_port_name = 1,
 780         .show_host_supported_classes = 1,
 781         .show_host_supported_fc4s = 1,
 782         .show_host_supported_speeds = 1,
 783         .show_host_maxframe_size = 1,
 784         .show_host_serial_number = 1,
 785         .get_fc_host_stats = zfcp_get_fc_host_stats,
 786         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 787         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 788         .get_host_port_state = zfcp_get_host_port_state,
 789         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 790         .show_host_port_state = 1,
 791         .show_host_active_fc4s = 1,
 792         .bsg_request = zfcp_fc_exec_bsg_job,
 793         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 794         /* no functions registered for following dynamic attributes but
 795            directly set by LLDD */
 796         .show_host_port_type = 1,
 797         .show_host_symbolic_name = 1,
 798         .show_host_speed = 1,
 799         .show_host_port_id = 1,
 800         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 801 };