drivers/s390/scsi/zfcp_scsi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Interface to Linux SCSI midlayer.
   6  *
   7  * Copyright IBM Corp. 2002, 2017
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/slab.h>
  16 #include <scsi/fc/fc_fcp.h>
  17 #include <scsi/scsi_eh.h>
  18 #include <linux/atomic.h>
  19 #include "zfcp_ext.h"
  20 #include "zfcp_dbf.h"
  21 #include "zfcp_fc.h"
  22 #include "zfcp_reqlist.h"
  23
  24 static unsigned int default_depth = 32;
  25 module_param_named(queue_depth, default_depth, uint, 0600);
  26 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  27
  28 static bool enable_dif;
  29 module_param_named(dif, enable_dif, bool, 0400);
  30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  31
  32 static bool allow_lun_scan = true;
  33 module_param(allow_lun_scan, bool, 0600);
  34 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  35
  36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  37 {
  38         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  39
  40         /* if previous slave_alloc returned early, there is nothing to do */
  41         if (!zfcp_sdev->port)
  42                 return;
  43
  44         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  45         put_device(&zfcp_sdev->port->dev);
  46 }
  47
  48 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  49 {
  50         if (sdp->tagged_supported)
  51                 scsi_change_queue_depth(sdp, default_depth);
  52         return 0;
  53 }
  54
  55 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  56 {
  57         set_host_byte(scpnt, result);
  58         zfcp_dbf_scsi_fail_send(scpnt);
  59         scpnt->scsi_done(scpnt);
  60 }
  61
  62 static
  63 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  64 {
  65         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  66         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  67         int    status, scsi_result, ret;
  68
  69         /* reset the status for this request */
  70         scpnt->result = 0;
  71         scpnt->host_scribble = NULL;
  72
  73         scsi_result = fc_remote_port_chkready(rport);
  74         if (unlikely(scsi_result)) {
  75                 scpnt->result = scsi_result;
  76                 zfcp_dbf_scsi_fail_send(scpnt);
  77                 scpnt->scsi_done(scpnt);
  78                 return 0;
  79         }
  80
  81         status = atomic_read(&zfcp_sdev->status);
  82         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  83                      !(atomic_read(&zfcp_sdev->port->status) &
  84                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
  85                 /* only LUN access denied, but port is good
  86                  * not covered by FC transport, have to fail here */
  87                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  88                 return 0;
  89         }
  90
  91         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  92                 /* This could be
  93                  * call to rport_delete pending: mimic retry from
  94                  *      fc_remote_port_chkready until rport is BLOCKED
  95                  */
  96                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
  97                 return 0;
  98         }
  99
 100         ret = zfcp_fsf_fcp_cmnd(scpnt);
 101         if (unlikely(ret == -EBUSY))
 102                 return SCSI_MLQUEUE_DEVICE_BUSY;
 103         else if (unlikely(ret < 0))
 104                 return SCSI_MLQUEUE_HOST_BUSY;
 105
 106         return ret;
 107 }
 108
 109 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 110 {
 111         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 112         struct zfcp_adapter *adapter =
 113                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 114         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 115         struct zfcp_port *port;
 116         struct zfcp_unit *unit;
 117         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 118
 119         zfcp_sdev->erp_action.adapter = adapter;
 120         zfcp_sdev->erp_action.sdev = sdev;
 121
 122         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 123         if (!port)
 124                 return -ENXIO;
 125
 126         zfcp_sdev->erp_action.port = port;
 127
 128         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 129         if (unit)
 130                 put_device(&unit->dev);
 131
 132         if (!unit && !(allow_lun_scan && npiv)) {
 133                 put_device(&port->dev);
 134                 return -ENXIO;
 135         }
 136
 137         zfcp_sdev->port = port;
 138         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 139         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 140         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 141         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 142         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 143         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 144         spin_lock_init(&zfcp_sdev->latencies.lock);
 145
 146         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 147         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 148         zfcp_erp_wait(port->adapter);
 149
 150         return 0;
 151 }
 152
 153 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 154 {
 155         struct Scsi_Host *scsi_host = scpnt->device->host;
 156         struct zfcp_adapter *adapter =
 157                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 158         struct zfcp_fsf_req *old_req, *abrt_req;
 159         unsigned long flags;
 160         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 161         int retval = SUCCESS, ret;
 162         int retry = 3;
 163         char *dbf_tag;
 164
 165         /* avoid race condition between late normal completion and abort */
 166         write_lock_irqsave(&adapter->abort_lock, flags);
 167
 168         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 169         if (!old_req) {
 170                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 171                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 172                 return FAILED; /* completion could be in progress */
 173         }
 174         old_req->data = NULL;
 175
 176         /* don't access old fsf_req after releasing the abort_lock */
 177         write_unlock_irqrestore(&adapter->abort_lock, flags);
 178
 179         while (retry--) {
 180                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 181                 if (abrt_req)
 182                         break;
 183
 184                 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
 185                 zfcp_erp_wait(adapter);
 186                 ret = fc_block_scsi_eh(scpnt);
 187                 if (ret) {
 188                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 189                         return ret;
 190                 }
 191                 if (!(atomic_read(&adapter->status) &
 192                       ZFCP_STATUS_COMMON_RUNNING)) {
 193                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 194                         return SUCCESS;
 195                 }
 196         }
 197         if (!abrt_req) {
 198                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 199                 return FAILED;
 200         }
 201
 202         wait_for_completion(&abrt_req->completion);
 203
 204         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 205                 dbf_tag = "abrt_ok";
 206         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 207                 dbf_tag = "abrt_nn";
 208         else {
 209                 dbf_tag = "abrt_fa";
 210                 retval = FAILED;
 211         }
 212         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 213         zfcp_fsf_req_free(abrt_req);
 214         return retval;
 215 }
 216
 217 struct zfcp_scsi_req_filter {
 218         u8 tmf_scope;
 219         u32 lun_handle;
 220         u32 port_handle;
 221 };
 222
 223 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 224 {
 225         struct zfcp_scsi_req_filter *filter =
 226                 (struct zfcp_scsi_req_filter *)data;
 227
 228         /* already aborted - prevent side-effects - or not a SCSI command */
 229         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 230                 return;
 231
 232         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 233         if (old_req->qtcb->header.port_handle != filter->port_handle)
 234                 return;
 235
 236         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 237             old_req->qtcb->header.lun_handle != filter->lun_handle)
 238                 return;
 239
 240         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 241         old_req->data = NULL;
 242 }
 243
 244 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 245 {
 246         struct zfcp_adapter *adapter = zsdev->port->adapter;
 247         struct zfcp_scsi_req_filter filter = {
 248                 .tmf_scope = FCP_TMF_TGT_RESET,
 249                 .port_handle = zsdev->port->handle,
 250         };
 251         unsigned long flags;
 252
 253         if (tm_flags == FCP_TMF_LUN_RESET) {
 254                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 255                 filter.lun_handle = zsdev->lun_handle;
 256         }
 257
 258         /*
 259          * abort_lock secures against other processings - in the abort-function
 260          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 261          */
 262         write_lock_irqsave(&adapter->abort_lock, flags);
 263         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 264                                    &filter);
 265         write_unlock_irqrestore(&adapter->abort_lock, flags);
 266 }
 267
 268 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 269 {
 270         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 271         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 272         struct zfcp_fsf_req *fsf_req = NULL;
 273         int retval = SUCCESS, ret;
 274         int retry = 3;
 275
 276         while (retry--) {
 277                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 278                 if (fsf_req)
 279                         break;
 280
 281                 zfcp_dbf_scsi_devreset("wait", scpnt, tm_flags, NULL);
 282                 zfcp_erp_wait(adapter);
 283                 ret = fc_block_scsi_eh(scpnt);
 284                 if (ret) {
 285                         zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL);
 286                         return ret;
 287                 }
 288
 289                 if (!(atomic_read(&adapter->status) &
 290                       ZFCP_STATUS_COMMON_RUNNING)) {
 291                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL);
 292                         return SUCCESS;
 293                 }
 294         }
 295         if (!fsf_req) {
 296                 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL);
 297                 return FAILED;
 298         }
 299
 300         wait_for_completion(&fsf_req->completion);
 301
 302         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 303                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req);
 304                 retval = FAILED;
 305         } else {
 306                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req);
 307                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 308         }
 309
 310         zfcp_fsf_req_free(fsf_req);
 311         return retval;
 312 }
 313
 314 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 315 {
 316         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 317 }
 318
 319 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 320 {
 321         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 322 }
 323
 324 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 325 {
 326         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 327         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 328         int ret = SUCCESS, fc_ret;
 329
 330         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 331         zfcp_erp_wait(adapter);
 332         fc_ret = fc_block_scsi_eh(scpnt);
 333         if (fc_ret)
 334                 ret = fc_ret;
 335
 336         zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 337         return ret;
 338 }
 339
 340 struct scsi_transport_template *zfcp_scsi_transport_template;
 341
 342 static struct scsi_host_template zfcp_scsi_host_template = {
 343         .module                  = THIS_MODULE,
 344         .name                    = "zfcp",
 345         .queuecommand            = zfcp_scsi_queuecommand,
 346         .eh_timed_out            = fc_eh_timed_out,
 347         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 348         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 349         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 350         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 351         .slave_alloc             = zfcp_scsi_slave_alloc,
 352         .slave_configure         = zfcp_scsi_slave_configure,
 353         .slave_destroy           = zfcp_scsi_slave_destroy,
 354         .change_queue_depth      = scsi_change_queue_depth,
 355         .proc_name               = "zfcp",
 356         .can_queue               = 4096,
 357         .this_id                 = -1,
 358         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 359                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 360                                    /* GCD, adjusted later */
 361         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 362                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 363                                    /* GCD, adjusted later */
 364         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 365         .use_clustering          = 1,
 366         .shost_attrs             = zfcp_sysfs_shost_attrs,
 367         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 368         .track_queue_depth       = 1,
 369 };
 370
 371 /**
 372  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 373  * @adapter: The zfcp adapter to register with the SCSI midlayer
 374  */
 375 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 376 {
 377         struct ccw_dev_id dev_id;
 378
 379         if (adapter->scsi_host)
 380                 return 0;
 381
 382         ccw_device_get_id(adapter->ccw_device, &dev_id);
 383         /* register adapter as SCSI host with mid layer of SCSI stack */
 384         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 385                                              sizeof (struct zfcp_adapter *));
 386         if (!adapter->scsi_host) {
 387                 dev_err(&adapter->ccw_device->dev,
 388                         "Registering the FCP device with the "
 389                         "SCSI stack failed\n");
 390                 return -EIO;
 391         }
 392
 393         /* tell the SCSI stack some characteristics of this adapter */
 394         adapter->scsi_host->max_id = 511;
 395         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 396         adapter->scsi_host->max_channel = 0;
 397         adapter->scsi_host->unique_id = dev_id.devno;
 398         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 399         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 400
 401         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 402
 403         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 404                 scsi_host_put(adapter->scsi_host);
 405                 return -EIO;
 406         }
 407
 408         return 0;
 409 }
 410
 411 /**
 412  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 413  * @adapter: The zfcp adapter to unregister.
 414  */
 415 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 416 {
 417         struct Scsi_Host *shost;
 418         struct zfcp_port *port;
 419
 420         shost = adapter->scsi_host;
 421         if (!shost)
 422                 return;
 423
 424         read_lock_irq(&adapter->port_list_lock);
 425         list_for_each_entry(port, &adapter->port_list, list)
 426                 port->rport = NULL;
 427         read_unlock_irq(&adapter->port_list_lock);
 428
 429         fc_remove_host(shost);
 430         scsi_remove_host(shost);
 431         scsi_host_put(shost);
 432         adapter->scsi_host = NULL;
 433 }
 434
 435 static struct fc_host_statistics*
 436 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 437 {
 438         struct fc_host_statistics *fc_stats;
 439
 440         if (!adapter->fc_stats) {
 441                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 442                 if (!fc_stats)
 443                         return NULL;
 444                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 445         }
 446         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 447         return adapter->fc_stats;
 448 }
 449
 450 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 451                                       struct fsf_qtcb_bottom_port *data,
 452                                       struct fsf_qtcb_bottom_port *old)
 453 {
 454         fc_stats->seconds_since_last_reset =
 455                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 456         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 457         fc_stats->tx_words = data->tx_words - old->tx_words;
 458         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 459         fc_stats->rx_words = data->rx_words - old->rx_words;
 460         fc_stats->lip_count = data->lip - old->lip;
 461         fc_stats->nos_count = data->nos - old->nos;
 462         fc_stats->error_frames = data->error_frames - old->error_frames;
 463         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 464         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 465         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 466         fc_stats->loss_of_signal_count =
 467                 data->loss_of_signal - old->loss_of_signal;
 468         fc_stats->prim_seq_protocol_err_count =
 469                 data->psp_error_counts - old->psp_error_counts;
 470         fc_stats->invalid_tx_word_count =
 471                 data->invalid_tx_words - old->invalid_tx_words;
 472         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 473         fc_stats->fcp_input_requests =
 474                 data->input_requests - old->input_requests;
 475         fc_stats->fcp_output_requests =
 476                 data->output_requests - old->output_requests;
 477         fc_stats->fcp_control_requests =
 478                 data->control_requests - old->control_requests;
 479         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 480         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 481 }
 482
 483 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 484                                    struct fsf_qtcb_bottom_port *data)
 485 {
 486         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 487         fc_stats->tx_frames = data->tx_frames;
 488         fc_stats->tx_words = data->tx_words;
 489         fc_stats->rx_frames = data->rx_frames;
 490         fc_stats->rx_words = data->rx_words;
 491         fc_stats->lip_count = data->lip;
 492         fc_stats->nos_count = data->nos;
 493         fc_stats->error_frames = data->error_frames;
 494         fc_stats->dumped_frames = data->dumped_frames;
 495         fc_stats->link_failure_count = data->link_failure;
 496         fc_stats->loss_of_sync_count = data->loss_of_sync;
 497         fc_stats->loss_of_signal_count = data->loss_of_signal;
 498         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 499         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 500         fc_stats->invalid_crc_count = data->invalid_crcs;
 501         fc_stats->fcp_input_requests = data->input_requests;
 502         fc_stats->fcp_output_requests = data->output_requests;
 503         fc_stats->fcp_control_requests = data->control_requests;
 504         fc_stats->fcp_input_megabytes = data->input_mb;
 505         fc_stats->fcp_output_megabytes = data->output_mb;
 506 }
 507
 508 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 509 {
 510         struct zfcp_adapter *adapter;
 511         struct fc_host_statistics *fc_stats;
 512         struct fsf_qtcb_bottom_port *data;
 513         int ret;
 514
 515         adapter = (struct zfcp_adapter *)host->hostdata[0];
 516         fc_stats = zfcp_init_fc_host_stats(adapter);
 517         if (!fc_stats)
 518                 return NULL;
 519
 520         data = kzalloc(sizeof(*data), GFP_KERNEL);
 521         if (!data)
 522                 return NULL;
 523
 524         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 525         if (ret) {
 526                 kfree(data);
 527                 return NULL;
 528         }
 529
 530         if (adapter->stats_reset &&
 531             ((jiffies/HZ - adapter->stats_reset) <
 532              data->seconds_since_last_reset))
 533                 zfcp_adjust_fc_host_stats(fc_stats, data,
 534                                           adapter->stats_reset_data);
 535         else
 536                 zfcp_set_fc_host_stats(fc_stats, data);
 537
 538         kfree(data);
 539         return fc_stats;
 540 }
 541
 542 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 543 {
 544         struct zfcp_adapter *adapter;
 545         struct fsf_qtcb_bottom_port *data;
 546         int ret;
 547
 548         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 549         data = kzalloc(sizeof(*data), GFP_KERNEL);
 550         if (!data)
 551                 return;
 552
 553         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 554         if (ret)
 555                 kfree(data);
 556         else {
 557                 adapter->stats_reset = jiffies/HZ;
 558                 kfree(adapter->stats_reset_data);
 559                 adapter->stats_reset_data = data; /* finally freed in
 560                                                      adapter_release */
 561         }
 562 }
 563
 564 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 565 {
 566         struct zfcp_adapter *adapter =
 567                 (struct zfcp_adapter *)shost->hostdata[0];
 568         int status = atomic_read(&adapter->status);
 569
 570         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 571             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 572                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 573         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 574                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 575         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 576                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 577         else
 578                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 579 }
 580
 581 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 582 {
 583         rport->dev_loss_tmo = timeout;
 584 }
 585
 586 /**
 587  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 588  * @rport: The FC rport where to teminate I/O
 589  *
 590  * Abort all pending SCSI commands for a port by closing the
 591  * port. Using a reopen avoids a conflict with a shutdown
 592  * overwriting a reopen. The "forced" ensures that a disappeared port
 593  * is not opened again as valid due to the cached plogi data in
 594  * non-NPIV mode.
 595  */
 596 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 597 {
 598         struct zfcp_port *port;
 599         struct Scsi_Host *shost = rport_to_shost(rport);
 600         struct zfcp_adapter *adapter =
 601                 (struct zfcp_adapter *)shost->hostdata[0];
 602
 603         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 604
 605         if (port) {
 606                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 607                 put_device(&port->dev);
 608         }
 609 }
 610
 611 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 612 {
 613         struct fc_rport_identifiers ids;
 614         struct fc_rport *rport;
 615
 616         if (port->rport)
 617                 return;
 618
 619         ids.node_name = port->wwnn;
 620         ids.port_name = port->wwpn;
 621         ids.port_id = port->d_id;
 622         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 623
 624         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 625                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 626                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 627         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 628         if (!rport) {
 629                 dev_err(&port->adapter->ccw_device->dev,
 630                         "Registering port 0x%016Lx failed\n",
 631                         (unsigned long long)port->wwpn);
 632                 return;
 633         }
 634
 635         rport->maxframe_size = port->maxframe_size;
 636         rport->supported_classes = port->supported_classes;
 637         port->rport = rport;
 638         port->starget_id = rport->scsi_target_id;
 639
 640         zfcp_unit_queue_scsi_scan(port);
 641 }
 642
 643 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 644 {
 645         struct fc_rport *rport = port->rport;
 646
 647         if (rport) {
 648                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 649                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 650                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 651                 fc_remote_port_delete(rport);
 652                 port->rport = NULL;
 653         }
 654 }
 655
 656 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 657 {
 658         get_device(&port->dev);
 659         port->rport_task = RPORT_ADD;
 660
 661         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 662                 put_device(&port->dev);
 663 }
 664
 665 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 666 {
 667         get_device(&port->dev);
 668         port->rport_task = RPORT_DEL;
 669
 670         if (port->rport && queue_work(port->adapter->work_queue,
 671                                       &port->rport_work))
 672                 return;
 673
 674         put_device(&port->dev);
 675 }
 676
 677 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 678 {
 679         unsigned long flags;
 680         struct zfcp_port *port;
 681
 682         read_lock_irqsave(&adapter->port_list_lock, flags);
 683         list_for_each_entry(port, &adapter->port_list, list)
 684                 zfcp_scsi_schedule_rport_block(port);
 685         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 686 }
 687
 688 void zfcp_scsi_rport_work(struct work_struct *work)
 689 {
 690         struct zfcp_port *port = container_of(work, struct zfcp_port,
 691                                               rport_work);
 692
 693         while (port->rport_task) {
 694                 if (port->rport_task == RPORT_ADD) {
 695                         port->rport_task = RPORT_NONE;
 696                         zfcp_scsi_rport_register(port);
 697                 } else {
 698                         port->rport_task = RPORT_NONE;
 699                         zfcp_scsi_rport_block(port);
 700                 }
 701         }
 702
 703         put_device(&port->dev);
 704 }
 705
 706 /**
 707  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 708  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 709  */
 710 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 711 {
 712         unsigned int mask = 0;
 713         unsigned int data_div;
 714         struct Scsi_Host *shost = adapter->scsi_host;
 715
 716         data_div = atomic_read(&adapter->status) &
 717                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 718
 719         if (enable_dif &&
 720             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 721                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 722
 723         if (enable_dif && data_div &&
 724             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 725                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 726                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 727                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 728                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 729                 shost->max_sectors = shost->sg_tablesize * 8;
 730         }
 731
 732         scsi_host_set_prot(shost, mask);
 733 }
 734
 735 /**
 736  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 737  * @scmd: The SCSI command to report the error for
 738  * @ascq: The ASCQ to put in the sense buffer
 739  *
 740  * See the error handling in sd_done for the sense codes used here.
 741  * Set DID_SOFT_ERROR to retry the request, if possible.
 742  */
 743 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 744 {
 745         scsi_build_sense_buffer(1, scmd->sense_buffer,
 746                                 ILLEGAL_REQUEST, 0x10, ascq);
 747         set_driver_byte(scmd, DRIVER_SENSE);
 748         scmd->result |= SAM_STAT_CHECK_CONDITION;
 749         set_host_byte(scmd, DID_SOFT_ERROR);
 750 }
 751
 752 struct fc_function_template zfcp_transport_functions = {
 753         .show_starget_port_id = 1,
 754         .show_starget_port_name = 1,
 755         .show_starget_node_name = 1,
 756         .show_rport_supported_classes = 1,
 757         .show_rport_maxframe_size = 1,
 758         .show_rport_dev_loss_tmo = 1,
 759         .show_host_node_name = 1,
 760         .show_host_port_name = 1,
 761         .show_host_permanent_port_name = 1,
 762         .show_host_supported_classes = 1,
 763         .show_host_supported_fc4s = 1,
 764         .show_host_supported_speeds = 1,
 765         .show_host_maxframe_size = 1,
 766         .show_host_serial_number = 1,
 767         .get_fc_host_stats = zfcp_get_fc_host_stats,
 768         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 769         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 770         .get_host_port_state = zfcp_get_host_port_state,
 771         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 772         .show_host_port_state = 1,
 773         .show_host_active_fc4s = 1,
 774         .bsg_request = zfcp_fc_exec_bsg_job,
 775         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 776         /* no functions registered for following dynamic attributes but
 777            directly set by LLDD */
 778         .show_host_port_type = 1,
 779         .show_host_symbolic_name = 1,
 780         .show_host_speed = 1,
 781         .show_host_port_id = 1,
 782         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 783 };