drivers/s390/scsi/zfcp_scsi.c

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