drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corp. 2002, 2016
   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 = 1;
  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 either
  92                  * open LUN pending: this is temporary, will result in
  93                  *      open LUN or ERP_FAILED, so retry command
  94                  * call to rport_delete pending: mimic retry from
  95                  *      fc_remote_port_chkready until rport is BLOCKED
  96                  */
  97                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
  98                 return 0;
  99         }
 100
 101         ret = zfcp_fsf_fcp_cmnd(scpnt);
 102         if (unlikely(ret == -EBUSY))
 103                 return SCSI_MLQUEUE_DEVICE_BUSY;
 104         else if (unlikely(ret < 0))
 105                 return SCSI_MLQUEUE_HOST_BUSY;
 106
 107         return ret;
 108 }
 109
 110 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 111 {
 112         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 113         struct zfcp_adapter *adapter =
 114                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 115         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 116         struct zfcp_port *port;
 117         struct zfcp_unit *unit;
 118         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 119
 120         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 121         if (!port)
 122                 return -ENXIO;
 123
 124         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 125         if (unit)
 126                 put_device(&unit->dev);
 127
 128         if (!unit && !(allow_lun_scan && npiv)) {
 129                 put_device(&port->dev);
 130                 return -ENXIO;
 131         }
 132
 133         zfcp_sdev->port = port;
 134         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 135         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 136         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 137         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 138         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 139         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 140         spin_lock_init(&zfcp_sdev->latencies.lock);
 141
 142         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 143         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 144         zfcp_erp_wait(port->adapter);
 145
 146         return 0;
 147 }
 148
 149 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 150 {
 151         struct Scsi_Host *scsi_host = scpnt->device->host;
 152         struct zfcp_adapter *adapter =
 153                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 154         struct zfcp_fsf_req *old_req, *abrt_req;
 155         unsigned long flags;
 156         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 157         int retval = SUCCESS, ret;
 158         int retry = 3;
 159         char *dbf_tag;
 160
 161         /* avoid race condition between late normal completion and abort */
 162         write_lock_irqsave(&adapter->abort_lock, flags);
 163
 164         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 165         if (!old_req) {
 166                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 167                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 168                 return FAILED; /* completion could be in progress */
 169         }
 170         old_req->data = NULL;
 171
 172         /* don't access old fsf_req after releasing the abort_lock */
 173         write_unlock_irqrestore(&adapter->abort_lock, flags);
 174
 175         while (retry--) {
 176                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 177                 if (abrt_req)
 178                         break;
 179
 180                 zfcp_erp_wait(adapter);
 181                 ret = fc_block_scsi_eh(scpnt);
 182                 if (ret) {
 183                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 184                         return ret;
 185                 }
 186                 if (!(atomic_read(&adapter->status) &
 187                       ZFCP_STATUS_COMMON_RUNNING)) {
 188                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 189                         return SUCCESS;
 190                 }
 191         }
 192         if (!abrt_req) {
 193                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 194                 return FAILED;
 195         }
 196
 197         wait_for_completion(&abrt_req->completion);
 198
 199         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 200                 dbf_tag = "abrt_ok";
 201         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 202                 dbf_tag = "abrt_nn";
 203         else {
 204                 dbf_tag = "abrt_fa";
 205                 retval = FAILED;
 206         }
 207         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 208         zfcp_fsf_req_free(abrt_req);
 209         return retval;
 210 }
 211
 212 struct zfcp_scsi_req_filter {
 213         u8 tmf_scope;
 214         u32 lun_handle;
 215         u32 port_handle;
 216 };
 217
 218 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 219 {
 220         struct zfcp_scsi_req_filter *filter =
 221                 (struct zfcp_scsi_req_filter *)data;
 222
 223         /* already aborted - prevent side-effects - or not a SCSI command */
 224         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 225                 return;
 226
 227         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 228         if (old_req->qtcb->header.port_handle != filter->port_handle)
 229                 return;
 230
 231         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 232             old_req->qtcb->header.lun_handle != filter->lun_handle)
 233                 return;
 234
 235         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 236         old_req->data = NULL;
 237 }
 238
 239 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 240 {
 241         struct zfcp_adapter *adapter = zsdev->port->adapter;
 242         struct zfcp_scsi_req_filter filter = {
 243                 .tmf_scope = FCP_TMF_TGT_RESET,
 244                 .port_handle = zsdev->port->handle,
 245         };
 246         unsigned long flags;
 247
 248         if (tm_flags == FCP_TMF_LUN_RESET) {
 249                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 250                 filter.lun_handle = zsdev->lun_handle;
 251         }
 252
 253         /*
 254          * abort_lock secures against other processings - in the abort-function
 255          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 256          */
 257         write_lock_irqsave(&adapter->abort_lock, flags);
 258         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 259                                    &filter);
 260         write_unlock_irqrestore(&adapter->abort_lock, flags);
 261 }
 262
 263 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 264 {
 265         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 266         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 267         struct zfcp_fsf_req *fsf_req = NULL;
 268         int retval = SUCCESS, ret;
 269         int retry = 3;
 270
 271         while (retry--) {
 272                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 273                 if (fsf_req)
 274                         break;
 275
 276                 zfcp_erp_wait(adapter);
 277                 ret = fc_block_scsi_eh(scpnt);
 278                 if (ret)
 279                         return ret;
 280
 281                 if (!(atomic_read(&adapter->status) &
 282                       ZFCP_STATUS_COMMON_RUNNING)) {
 283                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 284                         return SUCCESS;
 285                 }
 286         }
 287         if (!fsf_req)
 288                 return FAILED;
 289
 290         wait_for_completion(&fsf_req->completion);
 291
 292         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 293                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 294                 retval = FAILED;
 295         } else {
 296                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 297                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 298         }
 299
 300         zfcp_fsf_req_free(fsf_req);
 301         return retval;
 302 }
 303
 304 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 305 {
 306         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 307 }
 308
 309 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 310 {
 311         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 312 }
 313
 314 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 315 {
 316         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 317         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 318         int ret;
 319
 320         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 321         zfcp_erp_wait(adapter);
 322         ret = fc_block_scsi_eh(scpnt);
 323         if (ret)
 324                 return ret;
 325
 326         return SUCCESS;
 327 }
 328
 329 struct scsi_transport_template *zfcp_scsi_transport_template;
 330
 331 static struct scsi_host_template zfcp_scsi_host_template = {
 332         .module                  = THIS_MODULE,
 333         .name                    = "zfcp",
 334         .queuecommand            = zfcp_scsi_queuecommand,
 335         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 336         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 337         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 338         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 339         .slave_alloc             = zfcp_scsi_slave_alloc,
 340         .slave_configure         = zfcp_scsi_slave_configure,
 341         .slave_destroy           = zfcp_scsi_slave_destroy,
 342         .change_queue_depth      = scsi_change_queue_depth,
 343         .proc_name               = "zfcp",
 344         .can_queue               = 4096,
 345         .this_id                 = -1,
 346         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 347                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 348                                    /* GCD, adjusted later */
 349         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 350                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 351                                    /* GCD, adjusted later */
 352         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 353         .use_clustering          = 1,
 354         .shost_attrs             = zfcp_sysfs_shost_attrs,
 355         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 356         .track_queue_depth       = 1,
 357 };
 358
 359 /**
 360  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 361  * @adapter: The zfcp adapter to register with the SCSI midlayer
 362  */
 363 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 364 {
 365         struct ccw_dev_id dev_id;
 366
 367         if (adapter->scsi_host)
 368                 return 0;
 369
 370         ccw_device_get_id(adapter->ccw_device, &dev_id);
 371         /* register adapter as SCSI host with mid layer of SCSI stack */
 372         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 373                                              sizeof (struct zfcp_adapter *));
 374         if (!adapter->scsi_host) {
 375                 dev_err(&adapter->ccw_device->dev,
 376                         "Registering the FCP device with the "
 377                         "SCSI stack failed\n");
 378                 return -EIO;
 379         }
 380
 381         /* tell the SCSI stack some characteristics of this adapter */
 382         adapter->scsi_host->max_id = 511;
 383         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 384         adapter->scsi_host->max_channel = 0;
 385         adapter->scsi_host->unique_id = dev_id.devno;
 386         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 387         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 388
 389         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 390
 391         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 392                 scsi_host_put(adapter->scsi_host);
 393                 return -EIO;
 394         }
 395
 396         return 0;
 397 }
 398
 399 /**
 400  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 401  * @adapter: The zfcp adapter to unregister.
 402  */
 403 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 404 {
 405         struct Scsi_Host *shost;
 406         struct zfcp_port *port;
 407
 408         shost = adapter->scsi_host;
 409         if (!shost)
 410                 return;
 411
 412         read_lock_irq(&adapter->port_list_lock);
 413         list_for_each_entry(port, &adapter->port_list, list)
 414                 port->rport = NULL;
 415         read_unlock_irq(&adapter->port_list_lock);
 416
 417         fc_remove_host(shost);
 418         scsi_remove_host(shost);
 419         scsi_host_put(shost);
 420         adapter->scsi_host = NULL;
 421 }
 422
 423 static struct fc_host_statistics*
 424 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 425 {
 426         struct fc_host_statistics *fc_stats;
 427
 428         if (!adapter->fc_stats) {
 429                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 430                 if (!fc_stats)
 431                         return NULL;
 432                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 433         }
 434         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 435         return adapter->fc_stats;
 436 }
 437
 438 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 439                                       struct fsf_qtcb_bottom_port *data,
 440                                       struct fsf_qtcb_bottom_port *old)
 441 {
 442         fc_stats->seconds_since_last_reset =
 443                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 444         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 445         fc_stats->tx_words = data->tx_words - old->tx_words;
 446         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 447         fc_stats->rx_words = data->rx_words - old->rx_words;
 448         fc_stats->lip_count = data->lip - old->lip;
 449         fc_stats->nos_count = data->nos - old->nos;
 450         fc_stats->error_frames = data->error_frames - old->error_frames;
 451         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 452         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 453         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 454         fc_stats->loss_of_signal_count =
 455                 data->loss_of_signal - old->loss_of_signal;
 456         fc_stats->prim_seq_protocol_err_count =
 457                 data->psp_error_counts - old->psp_error_counts;
 458         fc_stats->invalid_tx_word_count =
 459                 data->invalid_tx_words - old->invalid_tx_words;
 460         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 461         fc_stats->fcp_input_requests =
 462                 data->input_requests - old->input_requests;
 463         fc_stats->fcp_output_requests =
 464                 data->output_requests - old->output_requests;
 465         fc_stats->fcp_control_requests =
 466                 data->control_requests - old->control_requests;
 467         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 468         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 469 }
 470
 471 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 472                                    struct fsf_qtcb_bottom_port *data)
 473 {
 474         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 475         fc_stats->tx_frames = data->tx_frames;
 476         fc_stats->tx_words = data->tx_words;
 477         fc_stats->rx_frames = data->rx_frames;
 478         fc_stats->rx_words = data->rx_words;
 479         fc_stats->lip_count = data->lip;
 480         fc_stats->nos_count = data->nos;
 481         fc_stats->error_frames = data->error_frames;
 482         fc_stats->dumped_frames = data->dumped_frames;
 483         fc_stats->link_failure_count = data->link_failure;
 484         fc_stats->loss_of_sync_count = data->loss_of_sync;
 485         fc_stats->loss_of_signal_count = data->loss_of_signal;
 486         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 487         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 488         fc_stats->invalid_crc_count = data->invalid_crcs;
 489         fc_stats->fcp_input_requests = data->input_requests;
 490         fc_stats->fcp_output_requests = data->output_requests;
 491         fc_stats->fcp_control_requests = data->control_requests;
 492         fc_stats->fcp_input_megabytes = data->input_mb;
 493         fc_stats->fcp_output_megabytes = data->output_mb;
 494 }
 495
 496 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 497 {
 498         struct zfcp_adapter *adapter;
 499         struct fc_host_statistics *fc_stats;
 500         struct fsf_qtcb_bottom_port *data;
 501         int ret;
 502
 503         adapter = (struct zfcp_adapter *)host->hostdata[0];
 504         fc_stats = zfcp_init_fc_host_stats(adapter);
 505         if (!fc_stats)
 506                 return NULL;
 507
 508         data = kzalloc(sizeof(*data), GFP_KERNEL);
 509         if (!data)
 510                 return NULL;
 511
 512         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 513         if (ret) {
 514                 kfree(data);
 515                 return NULL;
 516         }
 517
 518         if (adapter->stats_reset &&
 519             ((jiffies/HZ - adapter->stats_reset) <
 520              data->seconds_since_last_reset))
 521                 zfcp_adjust_fc_host_stats(fc_stats, data,
 522                                           adapter->stats_reset_data);
 523         else
 524                 zfcp_set_fc_host_stats(fc_stats, data);
 525
 526         kfree(data);
 527         return fc_stats;
 528 }
 529
 530 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 531 {
 532         struct zfcp_adapter *adapter;
 533         struct fsf_qtcb_bottom_port *data;
 534         int ret;
 535
 536         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 537         data = kzalloc(sizeof(*data), GFP_KERNEL);
 538         if (!data)
 539                 return;
 540
 541         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 542         if (ret)
 543                 kfree(data);
 544         else {
 545                 adapter->stats_reset = jiffies/HZ;
 546                 kfree(adapter->stats_reset_data);
 547                 adapter->stats_reset_data = data; /* finally freed in
 548                                                      adapter_release */
 549         }
 550 }
 551
 552 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 553 {
 554         struct zfcp_adapter *adapter =
 555                 (struct zfcp_adapter *)shost->hostdata[0];
 556         int status = atomic_read(&adapter->status);
 557
 558         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 559             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 560                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 561         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 562                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 563         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 564                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 565         else
 566                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 567 }
 568
 569 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 570 {
 571         rport->dev_loss_tmo = timeout;
 572 }
 573
 574 /**
 575  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 576  * @rport: The FC rport where to teminate I/O
 577  *
 578  * Abort all pending SCSI commands for a port by closing the
 579  * port. Using a reopen avoids a conflict with a shutdown
 580  * overwriting a reopen. The "forced" ensures that a disappeared port
 581  * is not opened again as valid due to the cached plogi data in
 582  * non-NPIV mode.
 583  */
 584 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 585 {
 586         struct zfcp_port *port;
 587         struct Scsi_Host *shost = rport_to_shost(rport);
 588         struct zfcp_adapter *adapter =
 589                 (struct zfcp_adapter *)shost->hostdata[0];
 590
 591         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 592
 593         if (port) {
 594                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 595                 put_device(&port->dev);
 596         }
 597 }
 598
 599 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 600 {
 601         struct fc_rport_identifiers ids;
 602         struct fc_rport *rport;
 603
 604         if (port->rport)
 605                 return;
 606
 607         ids.node_name = port->wwnn;
 608         ids.port_name = port->wwpn;
 609         ids.port_id = port->d_id;
 610         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 611
 612         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 613                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 614                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 615         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 616         if (!rport) {
 617                 dev_err(&port->adapter->ccw_device->dev,
 618                         "Registering port 0x%016Lx failed\n",
 619                         (unsigned long long)port->wwpn);
 620                 return;
 621         }
 622
 623         rport->maxframe_size = port->maxframe_size;
 624         rport->supported_classes = port->supported_classes;
 625         port->rport = rport;
 626         port->starget_id = rport->scsi_target_id;
 627
 628         zfcp_unit_queue_scsi_scan(port);
 629 }
 630
 631 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 632 {
 633         struct fc_rport *rport = port->rport;
 634
 635         if (rport) {
 636                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 637                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 638                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 639                 fc_remote_port_delete(rport);
 640                 port->rport = NULL;
 641         }
 642 }
 643
 644 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 645 {
 646         get_device(&port->dev);
 647         port->rport_task = RPORT_ADD;
 648
 649         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 650                 put_device(&port->dev);
 651 }
 652
 653 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 654 {
 655         get_device(&port->dev);
 656         port->rport_task = RPORT_DEL;
 657
 658         if (port->rport && queue_work(port->adapter->work_queue,
 659                                       &port->rport_work))
 660                 return;
 661
 662         put_device(&port->dev);
 663 }
 664
 665 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 666 {
 667         unsigned long flags;
 668         struct zfcp_port *port;
 669
 670         read_lock_irqsave(&adapter->port_list_lock, flags);
 671         list_for_each_entry(port, &adapter->port_list, list)
 672                 zfcp_scsi_schedule_rport_block(port);
 673         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 674 }
 675
 676 void zfcp_scsi_rport_work(struct work_struct *work)
 677 {
 678         struct zfcp_port *port = container_of(work, struct zfcp_port,
 679                                               rport_work);
 680
 681         while (port->rport_task) {
 682                 if (port->rport_task == RPORT_ADD) {
 683                         port->rport_task = RPORT_NONE;
 684                         zfcp_scsi_rport_register(port);
 685                 } else {
 686                         port->rport_task = RPORT_NONE;
 687                         zfcp_scsi_rport_block(port);
 688                 }
 689         }
 690
 691         put_device(&port->dev);
 692 }
 693
 694 /**
 695  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 696  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 697  */
 698 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 699 {
 700         unsigned int mask = 0;
 701         unsigned int data_div;
 702         struct Scsi_Host *shost = adapter->scsi_host;
 703
 704         data_div = atomic_read(&adapter->status) &
 705                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 706
 707         if (enable_dif &&
 708             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 709                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 710
 711         if (enable_dif && data_div &&
 712             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 713                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 714                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 715                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 716                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 717                 shost->max_sectors = shost->sg_tablesize * 8;
 718         }
 719
 720         scsi_host_set_prot(shost, mask);
 721 }
 722
 723 /**
 724  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 725  * @scmd: The SCSI command to report the error for
 726  * @ascq: The ASCQ to put in the sense buffer
 727  *
 728  * See the error handling in sd_done for the sense codes used here.
 729  * Set DID_SOFT_ERROR to retry the request, if possible.
 730  */
 731 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 732 {
 733         scsi_build_sense_buffer(1, scmd->sense_buffer,
 734                                 ILLEGAL_REQUEST, 0x10, ascq);
 735         set_driver_byte(scmd, DRIVER_SENSE);
 736         scmd->result |= SAM_STAT_CHECK_CONDITION;
 737         set_host_byte(scmd, DID_SOFT_ERROR);
 738 }
 739
 740 struct fc_function_template zfcp_transport_functions = {
 741         .show_starget_port_id = 1,
 742         .show_starget_port_name = 1,
 743         .show_starget_node_name = 1,
 744         .show_rport_supported_classes = 1,
 745         .show_rport_maxframe_size = 1,
 746         .show_rport_dev_loss_tmo = 1,
 747         .show_host_node_name = 1,
 748         .show_host_port_name = 1,
 749         .show_host_permanent_port_name = 1,
 750         .show_host_supported_classes = 1,
 751         .show_host_supported_fc4s = 1,
 752         .show_host_supported_speeds = 1,
 753         .show_host_maxframe_size = 1,
 754         .show_host_serial_number = 1,
 755         .get_fc_host_stats = zfcp_get_fc_host_stats,
 756         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 757         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 758         .get_host_port_state = zfcp_get_host_port_state,
 759         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 760         .show_host_port_state = 1,
 761         .show_host_active_fc4s = 1,
 762         .bsg_request = zfcp_fc_exec_bsg_job,
 763         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 764         /* no functions registered for following dynamic attributes but
 765            directly set by LLDD */
 766         .show_host_port_type = 1,
 767         .show_host_symbolic_name = 1,
 768         .show_host_speed = 1,
 769         .show_host_port_id = 1,
 770         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 771 };