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_erp_wait(adapter);
 185                 ret = fc_block_scsi_eh(scpnt);
 186                 if (ret) {
 187                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 188                         return ret;
 189                 }
 190                 if (!(atomic_read(&adapter->status) &
 191                       ZFCP_STATUS_COMMON_RUNNING)) {
 192                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 193                         return SUCCESS;
 194                 }
 195         }
 196         if (!abrt_req) {
 197                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 198                 return FAILED;
 199         }
 200
 201         wait_for_completion(&abrt_req->completion);
 202
 203         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 204                 dbf_tag = "abrt_ok";
 205         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 206                 dbf_tag = "abrt_nn";
 207         else {
 208                 dbf_tag = "abrt_fa";
 209                 retval = FAILED;
 210         }
 211         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 212         zfcp_fsf_req_free(abrt_req);
 213         return retval;
 214 }
 215
 216 struct zfcp_scsi_req_filter {
 217         u8 tmf_scope;
 218         u32 lun_handle;
 219         u32 port_handle;
 220 };
 221
 222 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 223 {
 224         struct zfcp_scsi_req_filter *filter =
 225                 (struct zfcp_scsi_req_filter *)data;
 226
 227         /* already aborted - prevent side-effects - or not a SCSI command */
 228         if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
 229                 return;
 230
 231         /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 232         if (old_req->qtcb->header.port_handle != filter->port_handle)
 233                 return;
 234
 235         if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 236             old_req->qtcb->header.lun_handle != filter->lun_handle)
 237                 return;
 238
 239         zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 240         old_req->data = NULL;
 241 }
 242
 243 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 244 {
 245         struct zfcp_adapter *adapter = zsdev->port->adapter;
 246         struct zfcp_scsi_req_filter filter = {
 247                 .tmf_scope = FCP_TMF_TGT_RESET,
 248                 .port_handle = zsdev->port->handle,
 249         };
 250         unsigned long flags;
 251
 252         if (tm_flags == FCP_TMF_LUN_RESET) {
 253                 filter.tmf_scope = FCP_TMF_LUN_RESET;
 254                 filter.lun_handle = zsdev->lun_handle;
 255         }
 256
 257         /*
 258          * abort_lock secures against other processings - in the abort-function
 259          * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 260          */
 261         write_lock_irqsave(&adapter->abort_lock, flags);
 262         zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 263                                    &filter);
 264         write_unlock_irqrestore(&adapter->abort_lock, flags);
 265 }
 266
 267 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 268 {
 269         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 270         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 271         struct zfcp_fsf_req *fsf_req = NULL;
 272         int retval = SUCCESS, ret;
 273         int retry = 3;
 274
 275         while (retry--) {
 276                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 277                 if (fsf_req)
 278                         break;
 279
 280                 zfcp_erp_wait(adapter);
 281                 ret = fc_block_scsi_eh(scpnt);
 282                 if (ret) {
 283                         zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL);
 284                         return ret;
 285                 }
 286
 287                 if (!(atomic_read(&adapter->status) &
 288                       ZFCP_STATUS_COMMON_RUNNING)) {
 289                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL);
 290                         return SUCCESS;
 291                 }
 292         }
 293         if (!fsf_req) {
 294                 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL);
 295                 return FAILED;
 296         }
 297
 298         wait_for_completion(&fsf_req->completion);
 299
 300         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 301                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req);
 302                 retval = FAILED;
 303         } else {
 304                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req);
 305                 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 306         }
 307
 308         zfcp_fsf_req_free(fsf_req);
 309         return retval;
 310 }
 311
 312 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 313 {
 314         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 315 }
 316
 317 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 318 {
 319         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 320 }
 321
 322 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 323 {
 324         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 325         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 326         int ret;
 327
 328         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 329         zfcp_erp_wait(adapter);
 330         ret = fc_block_scsi_eh(scpnt);
 331         if (ret)
 332                 return ret;
 333
 334         return SUCCESS;
 335 }
 336
 337 struct scsi_transport_template *zfcp_scsi_transport_template;
 338
 339 static struct scsi_host_template zfcp_scsi_host_template = {
 340         .module                  = THIS_MODULE,
 341         .name                    = "zfcp",
 342         .queuecommand            = zfcp_scsi_queuecommand,
 343         .eh_timed_out            = fc_eh_timed_out,
 344         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 345         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 346         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 347         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 348         .slave_alloc             = zfcp_scsi_slave_alloc,
 349         .slave_configure         = zfcp_scsi_slave_configure,
 350         .slave_destroy           = zfcp_scsi_slave_destroy,
 351         .change_queue_depth      = scsi_change_queue_depth,
 352         .proc_name               = "zfcp",
 353         .can_queue               = 4096,
 354         .this_id                 = -1,
 355         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 356                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 357                                    /* GCD, adjusted later */
 358         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 359                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 360                                    /* GCD, adjusted later */
 361         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 362         .use_clustering          = 1,
 363         .shost_attrs             = zfcp_sysfs_shost_attrs,
 364         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 365         .track_queue_depth       = 1,
 366 };
 367
 368 /**
 369  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 370  * @adapter: The zfcp adapter to register with the SCSI midlayer
 371  */
 372 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 373 {
 374         struct ccw_dev_id dev_id;
 375
 376         if (adapter->scsi_host)
 377                 return 0;
 378
 379         ccw_device_get_id(adapter->ccw_device, &dev_id);
 380         /* register adapter as SCSI host with mid layer of SCSI stack */
 381         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 382                                              sizeof (struct zfcp_adapter *));
 383         if (!adapter->scsi_host) {
 384                 dev_err(&adapter->ccw_device->dev,
 385                         "Registering the FCP device with the "
 386                         "SCSI stack failed\n");
 387                 return -EIO;
 388         }
 389
 390         /* tell the SCSI stack some characteristics of this adapter */
 391         adapter->scsi_host->max_id = 511;
 392         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 393         adapter->scsi_host->max_channel = 0;
 394         adapter->scsi_host->unique_id = dev_id.devno;
 395         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 396         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 397
 398         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 399
 400         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 401                 scsi_host_put(adapter->scsi_host);
 402                 return -EIO;
 403         }
 404
 405         return 0;
 406 }
 407
 408 /**
 409  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 410  * @adapter: The zfcp adapter to unregister.
 411  */
 412 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 413 {
 414         struct Scsi_Host *shost;
 415         struct zfcp_port *port;
 416
 417         shost = adapter->scsi_host;
 418         if (!shost)
 419                 return;
 420
 421         read_lock_irq(&adapter->port_list_lock);
 422         list_for_each_entry(port, &adapter->port_list, list)
 423                 port->rport = NULL;
 424         read_unlock_irq(&adapter->port_list_lock);
 425
 426         fc_remove_host(shost);
 427         scsi_remove_host(shost);
 428         scsi_host_put(shost);
 429         adapter->scsi_host = NULL;
 430 }
 431
 432 static struct fc_host_statistics*
 433 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 434 {
 435         struct fc_host_statistics *fc_stats;
 436
 437         if (!adapter->fc_stats) {
 438                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 439                 if (!fc_stats)
 440                         return NULL;
 441                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 442         }
 443         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 444         return adapter->fc_stats;
 445 }
 446
 447 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 448                                       struct fsf_qtcb_bottom_port *data,
 449                                       struct fsf_qtcb_bottom_port *old)
 450 {
 451         fc_stats->seconds_since_last_reset =
 452                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 453         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 454         fc_stats->tx_words = data->tx_words - old->tx_words;
 455         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 456         fc_stats->rx_words = data->rx_words - old->rx_words;
 457         fc_stats->lip_count = data->lip - old->lip;
 458         fc_stats->nos_count = data->nos - old->nos;
 459         fc_stats->error_frames = data->error_frames - old->error_frames;
 460         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 461         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 462         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 463         fc_stats->loss_of_signal_count =
 464                 data->loss_of_signal - old->loss_of_signal;
 465         fc_stats->prim_seq_protocol_err_count =
 466                 data->psp_error_counts - old->psp_error_counts;
 467         fc_stats->invalid_tx_word_count =
 468                 data->invalid_tx_words - old->invalid_tx_words;
 469         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 470         fc_stats->fcp_input_requests =
 471                 data->input_requests - old->input_requests;
 472         fc_stats->fcp_output_requests =
 473                 data->output_requests - old->output_requests;
 474         fc_stats->fcp_control_requests =
 475                 data->control_requests - old->control_requests;
 476         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 477         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 478 }
 479
 480 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 481                                    struct fsf_qtcb_bottom_port *data)
 482 {
 483         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 484         fc_stats->tx_frames = data->tx_frames;
 485         fc_stats->tx_words = data->tx_words;
 486         fc_stats->rx_frames = data->rx_frames;
 487         fc_stats->rx_words = data->rx_words;
 488         fc_stats->lip_count = data->lip;
 489         fc_stats->nos_count = data->nos;
 490         fc_stats->error_frames = data->error_frames;
 491         fc_stats->dumped_frames = data->dumped_frames;
 492         fc_stats->link_failure_count = data->link_failure;
 493         fc_stats->loss_of_sync_count = data->loss_of_sync;
 494         fc_stats->loss_of_signal_count = data->loss_of_signal;
 495         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 496         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 497         fc_stats->invalid_crc_count = data->invalid_crcs;
 498         fc_stats->fcp_input_requests = data->input_requests;
 499         fc_stats->fcp_output_requests = data->output_requests;
 500         fc_stats->fcp_control_requests = data->control_requests;
 501         fc_stats->fcp_input_megabytes = data->input_mb;
 502         fc_stats->fcp_output_megabytes = data->output_mb;
 503 }
 504
 505 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 506 {
 507         struct zfcp_adapter *adapter;
 508         struct fc_host_statistics *fc_stats;
 509         struct fsf_qtcb_bottom_port *data;
 510         int ret;
 511
 512         adapter = (struct zfcp_adapter *)host->hostdata[0];
 513         fc_stats = zfcp_init_fc_host_stats(adapter);
 514         if (!fc_stats)
 515                 return NULL;
 516
 517         data = kzalloc(sizeof(*data), GFP_KERNEL);
 518         if (!data)
 519                 return NULL;
 520
 521         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 522         if (ret) {
 523                 kfree(data);
 524                 return NULL;
 525         }
 526
 527         if (adapter->stats_reset &&
 528             ((jiffies/HZ - adapter->stats_reset) <
 529              data->seconds_since_last_reset))
 530                 zfcp_adjust_fc_host_stats(fc_stats, data,
 531                                           adapter->stats_reset_data);
 532         else
 533                 zfcp_set_fc_host_stats(fc_stats, data);
 534
 535         kfree(data);
 536         return fc_stats;
 537 }
 538
 539 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 540 {
 541         struct zfcp_adapter *adapter;
 542         struct fsf_qtcb_bottom_port *data;
 543         int ret;
 544
 545         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 546         data = kzalloc(sizeof(*data), GFP_KERNEL);
 547         if (!data)
 548                 return;
 549
 550         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 551         if (ret)
 552                 kfree(data);
 553         else {
 554                 adapter->stats_reset = jiffies/HZ;
 555                 kfree(adapter->stats_reset_data);
 556                 adapter->stats_reset_data = data; /* finally freed in
 557                                                      adapter_release */
 558         }
 559 }
 560
 561 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 562 {
 563         struct zfcp_adapter *adapter =
 564                 (struct zfcp_adapter *)shost->hostdata[0];
 565         int status = atomic_read(&adapter->status);
 566
 567         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 568             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 569                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 570         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 571                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 572         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 573                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 574         else
 575                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 576 }
 577
 578 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 579 {
 580         rport->dev_loss_tmo = timeout;
 581 }
 582
 583 /**
 584  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 585  * @rport: The FC rport where to teminate I/O
 586  *
 587  * Abort all pending SCSI commands for a port by closing the
 588  * port. Using a reopen avoids a conflict with a shutdown
 589  * overwriting a reopen. The "forced" ensures that a disappeared port
 590  * is not opened again as valid due to the cached plogi data in
 591  * non-NPIV mode.
 592  */
 593 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 594 {
 595         struct zfcp_port *port;
 596         struct Scsi_Host *shost = rport_to_shost(rport);
 597         struct zfcp_adapter *adapter =
 598                 (struct zfcp_adapter *)shost->hostdata[0];
 599
 600         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 601
 602         if (port) {
 603                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 604                 put_device(&port->dev);
 605         }
 606 }
 607
 608 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 609 {
 610         struct fc_rport_identifiers ids;
 611         struct fc_rport *rport;
 612
 613         if (port->rport)
 614                 return;
 615
 616         ids.node_name = port->wwnn;
 617         ids.port_name = port->wwpn;
 618         ids.port_id = port->d_id;
 619         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 620
 621         zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL,
 622                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 623                           ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 624         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 625         if (!rport) {
 626                 dev_err(&port->adapter->ccw_device->dev,
 627                         "Registering port 0x%016Lx failed\n",
 628                         (unsigned long long)port->wwpn);
 629                 return;
 630         }
 631
 632         rport->maxframe_size = port->maxframe_size;
 633         rport->supported_classes = port->supported_classes;
 634         port->rport = rport;
 635         port->starget_id = rport->scsi_target_id;
 636
 637         zfcp_unit_queue_scsi_scan(port);
 638 }
 639
 640 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 641 {
 642         struct fc_rport *rport = port->rport;
 643
 644         if (rport) {
 645                 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL,
 646                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 647                                   ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 648                 fc_remote_port_delete(rport);
 649                 port->rport = NULL;
 650         }
 651 }
 652
 653 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 654 {
 655         get_device(&port->dev);
 656         port->rport_task = RPORT_ADD;
 657
 658         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 659                 put_device(&port->dev);
 660 }
 661
 662 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 663 {
 664         get_device(&port->dev);
 665         port->rport_task = RPORT_DEL;
 666
 667         if (port->rport && queue_work(port->adapter->work_queue,
 668                                       &port->rport_work))
 669                 return;
 670
 671         put_device(&port->dev);
 672 }
 673
 674 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 675 {
 676         unsigned long flags;
 677         struct zfcp_port *port;
 678
 679         read_lock_irqsave(&adapter->port_list_lock, flags);
 680         list_for_each_entry(port, &adapter->port_list, list)
 681                 zfcp_scsi_schedule_rport_block(port);
 682         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 683 }
 684
 685 void zfcp_scsi_rport_work(struct work_struct *work)
 686 {
 687         struct zfcp_port *port = container_of(work, struct zfcp_port,
 688                                               rport_work);
 689
 690         while (port->rport_task) {
 691                 if (port->rport_task == RPORT_ADD) {
 692                         port->rport_task = RPORT_NONE;
 693                         zfcp_scsi_rport_register(port);
 694                 } else {
 695                         port->rport_task = RPORT_NONE;
 696                         zfcp_scsi_rport_block(port);
 697                 }
 698         }
 699
 700         put_device(&port->dev);
 701 }
 702
 703 /**
 704  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 705  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 706  */
 707 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 708 {
 709         unsigned int mask = 0;
 710         unsigned int data_div;
 711         struct Scsi_Host *shost = adapter->scsi_host;
 712
 713         data_div = atomic_read(&adapter->status) &
 714                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 715
 716         if (enable_dif &&
 717             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 718                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 719
 720         if (enable_dif && data_div &&
 721             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 722                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 723                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 724                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 725                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 726                 shost->max_sectors = shost->sg_tablesize * 8;
 727         }
 728
 729         scsi_host_set_prot(shost, mask);
 730 }
 731
 732 /**
 733  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 734  * @scmd: The SCSI command to report the error for
 735  * @ascq: The ASCQ to put in the sense buffer
 736  *
 737  * See the error handling in sd_done for the sense codes used here.
 738  * Set DID_SOFT_ERROR to retry the request, if possible.
 739  */
 740 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 741 {
 742         scsi_build_sense_buffer(1, scmd->sense_buffer,
 743                                 ILLEGAL_REQUEST, 0x10, ascq);
 744         set_driver_byte(scmd, DRIVER_SENSE);
 745         scmd->result |= SAM_STAT_CHECK_CONDITION;
 746         set_host_byte(scmd, DID_SOFT_ERROR);
 747 }
 748
 749 struct fc_function_template zfcp_transport_functions = {
 750         .show_starget_port_id = 1,
 751         .show_starget_port_name = 1,
 752         .show_starget_node_name = 1,
 753         .show_rport_supported_classes = 1,
 754         .show_rport_maxframe_size = 1,
 755         .show_rport_dev_loss_tmo = 1,
 756         .show_host_node_name = 1,
 757         .show_host_port_name = 1,
 758         .show_host_permanent_port_name = 1,
 759         .show_host_supported_classes = 1,
 760         .show_host_supported_fc4s = 1,
 761         .show_host_supported_speeds = 1,
 762         .show_host_maxframe_size = 1,
 763         .show_host_serial_number = 1,
 764         .get_fc_host_stats = zfcp_get_fc_host_stats,
 765         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 766         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 767         .get_host_port_state = zfcp_get_host_port_state,
 768         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 769         .show_host_port_state = 1,
 770         .show_host_active_fc4s = 1,
 771         .bsg_request = zfcp_fc_exec_bsg_job,
 772         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 773         /* no functions registered for following dynamic attributes but
 774            directly set by LLDD */
 775         .show_host_port_type = 1,
 776         .show_host_symbolic_name = 1,
 777         .show_host_speed = 1,
 778         .show_host_port_id = 1,
 779         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 780 };