drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corporation 2002, 2010
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <scsi/fc/fc_fcp.h>
  15 #include <scsi/scsi_eh.h>
  16 #include <asm/atomic.h>
  17 #include "zfcp_ext.h"
  18 #include "zfcp_dbf.h"
  19 #include "zfcp_fc.h"
  20 #include "zfcp_reqlist.h"
  21
  22 static unsigned int default_depth = 32;
  23 module_param_named(queue_depth, default_depth, uint, 0600);
  24 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  25
  26 static bool enable_dif;
  27
  28 #ifdef CONFIG_ZFCP_DIF
  29 module_param_named(dif, enable_dif, bool, 0600);
  30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  31 #endif
  32
  33 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  34                                         int reason)
  35 {
  36         switch (reason) {
  37         case SCSI_QDEPTH_DEFAULT:
  38                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  39                 break;
  40         case SCSI_QDEPTH_QFULL:
  41                 scsi_track_queue_full(sdev, depth);
  42                 break;
  43         case SCSI_QDEPTH_RAMP_UP:
  44                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  45                 break;
  46         default:
  47                 return -EOPNOTSUPP;
  48         }
  49         return sdev->queue_depth;
  50 }
  51
  52 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  53 {
  54         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  55
  56         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  57         put_device(&zfcp_sdev->port->dev);
  58 }
  59
  60 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  61 {
  62         if (sdp->tagged_supported)
  63                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  64         else
  65                 scsi_adjust_queue_depth(sdp, 0, 1);
  66         return 0;
  67 }
  68
  69 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  70 {
  71         struct zfcp_adapter *adapter =
  72                 (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  73
  74         set_host_byte(scpnt, result);
  75         zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
  76         scpnt->scsi_done(scpnt);
  77 }
  78
  79 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  80                                   void (*done) (struct scsi_cmnd *))
  81 {
  82         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  83         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
  84         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  85         int    status, scsi_result, ret;
  86
  87         /* reset the status for this request */
  88         scpnt->result = 0;
  89         scpnt->host_scribble = NULL;
  90         scpnt->scsi_done = done;
  91
  92         scsi_result = fc_remote_port_chkready(rport);
  93         if (unlikely(scsi_result)) {
  94                 scpnt->result = scsi_result;
  95                 zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
  96                 scpnt->scsi_done(scpnt);
  97                 return 0;
  98         }
  99
 100         status = atomic_read(&zfcp_sdev->status);
 101         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 102                      !(atomic_read(&zfcp_sdev->port->status) &
 103                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 104                 /* only LUN access denied, but port is good
 105                  * not covered by FC transport, have to fail here */
 106                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 107                 return 0;
 108         }
 109
 110         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 111                 /* This could be either
 112                  * open LUN pending: this is temporary, will result in
 113                  *      open LUN or ERP_FAILED, so retry command
 114                  * call to rport_delete pending: mimic retry from
 115                  *      fc_remote_port_chkready until rport is BLOCKED
 116                  */
 117                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 118                 return 0;
 119         }
 120
 121         ret = zfcp_fsf_fcp_cmnd(scpnt);
 122         if (unlikely(ret == -EBUSY))
 123                 return SCSI_MLQUEUE_DEVICE_BUSY;
 124         else if (unlikely(ret < 0))
 125                 return SCSI_MLQUEUE_HOST_BUSY;
 126
 127         return ret;
 128 }
 129
 130 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 131 {
 132         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 133         struct zfcp_adapter *adapter =
 134                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 135         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 136         struct zfcp_port *port;
 137         struct zfcp_unit *unit;
 138
 139         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 140         if (!port)
 141                 return -ENXIO;
 142
 143         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 144         if (unit)
 145                 put_device(&unit->dev);
 146
 147         if (!unit && !(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
 148                 put_device(&port->dev);
 149                 return -ENXIO;
 150         }
 151
 152         zfcp_sdev->port = port;
 153         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 154         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 155         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 157         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 158         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 159         spin_lock_init(&zfcp_sdev->latencies.lock);
 160
 161         zfcp_erp_modify_lun_status(sdev, "scsla_0", NULL,
 162                                    ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 163         zfcp_erp_lun_reopen(sdev, 0, "scsla_1", NULL);
 164         zfcp_erp_wait(port->adapter);
 165
 166         return 0;
 167 }
 168
 169 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 170 {
 171         struct Scsi_Host *scsi_host = scpnt->device->host;
 172         struct zfcp_adapter *adapter =
 173                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 174         struct zfcp_fsf_req *old_req, *abrt_req;
 175         unsigned long flags;
 176         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 177         int retval = SUCCESS, ret;
 178         int retry = 3;
 179         char *dbf_tag;
 180
 181         /* avoid race condition between late normal completion and abort */
 182         write_lock_irqsave(&adapter->abort_lock, flags);
 183
 184         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 185         if (!old_req) {
 186                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 187                 zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
 188                                     old_reqid);
 189                 return FAILED; /* completion could be in progress */
 190         }
 191         old_req->data = NULL;
 192
 193         /* don't access old fsf_req after releasing the abort_lock */
 194         write_unlock_irqrestore(&adapter->abort_lock, flags);
 195
 196         while (retry--) {
 197                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 198                 if (abrt_req)
 199                         break;
 200
 201                 zfcp_erp_wait(adapter);
 202                 ret = fc_block_scsi_eh(scpnt);
 203                 if (ret)
 204                         return ret;
 205                 if (!(atomic_read(&adapter->status) &
 206                       ZFCP_STATUS_COMMON_RUNNING)) {
 207                         zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
 208                                             old_reqid);
 209                         return SUCCESS;
 210                 }
 211         }
 212         if (!abrt_req)
 213                 return FAILED;
 214
 215         wait_for_completion(&abrt_req->completion);
 216
 217         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 218                 dbf_tag = "okay";
 219         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 220                 dbf_tag = "lte2";
 221         else {
 222                 dbf_tag = "fail";
 223                 retval = FAILED;
 224         }
 225         zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
 226         zfcp_fsf_req_free(abrt_req);
 227         return retval;
 228 }
 229
 230 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 231 {
 232         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 233         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 234         struct zfcp_fsf_req *fsf_req = NULL;
 235         int retval = SUCCESS, ret;
 236         int retry = 3;
 237
 238         while (retry--) {
 239                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 240                 if (fsf_req)
 241                         break;
 242
 243                 zfcp_erp_wait(adapter);
 244                 ret = fc_block_scsi_eh(scpnt);
 245                 if (ret)
 246                         return ret;
 247
 248                 if (!(atomic_read(&adapter->status) &
 249                       ZFCP_STATUS_COMMON_RUNNING)) {
 250                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 251                         return SUCCESS;
 252                 }
 253         }
 254         if (!fsf_req)
 255                 return FAILED;
 256
 257         wait_for_completion(&fsf_req->completion);
 258
 259         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 260                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 261                 retval = FAILED;
 262         } else
 263                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 264
 265         zfcp_fsf_req_free(fsf_req);
 266         return retval;
 267 }
 268
 269 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 270 {
 271         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 272 }
 273
 274 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 275 {
 276         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 277 }
 278
 279 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 280 {
 281         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 282         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 283         int ret;
 284
 285         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 286         zfcp_erp_wait(adapter);
 287         ret = fc_block_scsi_eh(scpnt);
 288         if (ret)
 289                 return ret;
 290
 291         return SUCCESS;
 292 }
 293
 294 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 295 {
 296         struct ccw_dev_id dev_id;
 297
 298         if (adapter->scsi_host)
 299                 return 0;
 300
 301         ccw_device_get_id(adapter->ccw_device, &dev_id);
 302         /* register adapter as SCSI host with mid layer of SCSI stack */
 303         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 304                                              sizeof (struct zfcp_adapter *));
 305         if (!adapter->scsi_host) {
 306                 dev_err(&adapter->ccw_device->dev,
 307                         "Registering the FCP device with the "
 308                         "SCSI stack failed\n");
 309                 return -EIO;
 310         }
 311
 312         /* tell the SCSI stack some characteristics of this adapter */
 313         adapter->scsi_host->max_id = 511;
 314         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 315         adapter->scsi_host->max_channel = 0;
 316         adapter->scsi_host->unique_id = dev_id.devno;
 317         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 318         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 319
 320         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 321
 322         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 323                 scsi_host_put(adapter->scsi_host);
 324                 return -EIO;
 325         }
 326
 327         return 0;
 328 }
 329
 330 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 331 {
 332         struct Scsi_Host *shost;
 333         struct zfcp_port *port;
 334
 335         shost = adapter->scsi_host;
 336         if (!shost)
 337                 return;
 338
 339         read_lock_irq(&adapter->port_list_lock);
 340         list_for_each_entry(port, &adapter->port_list, list)
 341                 port->rport = NULL;
 342         read_unlock_irq(&adapter->port_list_lock);
 343
 344         fc_remove_host(shost);
 345         scsi_remove_host(shost);
 346         scsi_host_put(shost);
 347         adapter->scsi_host = NULL;
 348
 349         return;
 350 }
 351
 352 static struct fc_host_statistics*
 353 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 354 {
 355         struct fc_host_statistics *fc_stats;
 356
 357         if (!adapter->fc_stats) {
 358                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 359                 if (!fc_stats)
 360                         return NULL;
 361                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 362         }
 363         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 364         return adapter->fc_stats;
 365 }
 366
 367 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 368                                       struct fsf_qtcb_bottom_port *data,
 369                                       struct fsf_qtcb_bottom_port *old)
 370 {
 371         fc_stats->seconds_since_last_reset =
 372                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 373         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 374         fc_stats->tx_words = data->tx_words - old->tx_words;
 375         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 376         fc_stats->rx_words = data->rx_words - old->rx_words;
 377         fc_stats->lip_count = data->lip - old->lip;
 378         fc_stats->nos_count = data->nos - old->nos;
 379         fc_stats->error_frames = data->error_frames - old->error_frames;
 380         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 381         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 382         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 383         fc_stats->loss_of_signal_count =
 384                 data->loss_of_signal - old->loss_of_signal;
 385         fc_stats->prim_seq_protocol_err_count =
 386                 data->psp_error_counts - old->psp_error_counts;
 387         fc_stats->invalid_tx_word_count =
 388                 data->invalid_tx_words - old->invalid_tx_words;
 389         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 390         fc_stats->fcp_input_requests =
 391                 data->input_requests - old->input_requests;
 392         fc_stats->fcp_output_requests =
 393                 data->output_requests - old->output_requests;
 394         fc_stats->fcp_control_requests =
 395                 data->control_requests - old->control_requests;
 396         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 397         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 398 }
 399
 400 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 401                                    struct fsf_qtcb_bottom_port *data)
 402 {
 403         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 404         fc_stats->tx_frames = data->tx_frames;
 405         fc_stats->tx_words = data->tx_words;
 406         fc_stats->rx_frames = data->rx_frames;
 407         fc_stats->rx_words = data->rx_words;
 408         fc_stats->lip_count = data->lip;
 409         fc_stats->nos_count = data->nos;
 410         fc_stats->error_frames = data->error_frames;
 411         fc_stats->dumped_frames = data->dumped_frames;
 412         fc_stats->link_failure_count = data->link_failure;
 413         fc_stats->loss_of_sync_count = data->loss_of_sync;
 414         fc_stats->loss_of_signal_count = data->loss_of_signal;
 415         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 416         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 417         fc_stats->invalid_crc_count = data->invalid_crcs;
 418         fc_stats->fcp_input_requests = data->input_requests;
 419         fc_stats->fcp_output_requests = data->output_requests;
 420         fc_stats->fcp_control_requests = data->control_requests;
 421         fc_stats->fcp_input_megabytes = data->input_mb;
 422         fc_stats->fcp_output_megabytes = data->output_mb;
 423 }
 424
 425 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 426 {
 427         struct zfcp_adapter *adapter;
 428         struct fc_host_statistics *fc_stats;
 429         struct fsf_qtcb_bottom_port *data;
 430         int ret;
 431
 432         adapter = (struct zfcp_adapter *)host->hostdata[0];
 433         fc_stats = zfcp_init_fc_host_stats(adapter);
 434         if (!fc_stats)
 435                 return NULL;
 436
 437         data = kzalloc(sizeof(*data), GFP_KERNEL);
 438         if (!data)
 439                 return NULL;
 440
 441         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 442         if (ret) {
 443                 kfree(data);
 444                 return NULL;
 445         }
 446
 447         if (adapter->stats_reset &&
 448             ((jiffies/HZ - adapter->stats_reset) <
 449              data->seconds_since_last_reset))
 450                 zfcp_adjust_fc_host_stats(fc_stats, data,
 451                                           adapter->stats_reset_data);
 452         else
 453                 zfcp_set_fc_host_stats(fc_stats, data);
 454
 455         kfree(data);
 456         return fc_stats;
 457 }
 458
 459 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 460 {
 461         struct zfcp_adapter *adapter;
 462         struct fsf_qtcb_bottom_port *data;
 463         int ret;
 464
 465         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 466         data = kzalloc(sizeof(*data), GFP_KERNEL);
 467         if (!data)
 468                 return;
 469
 470         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 471         if (ret)
 472                 kfree(data);
 473         else {
 474                 adapter->stats_reset = jiffies/HZ;
 475                 kfree(adapter->stats_reset_data);
 476                 adapter->stats_reset_data = data; /* finally freed in
 477                                                      adapter_release */
 478         }
 479 }
 480
 481 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 482 {
 483         struct zfcp_adapter *adapter =
 484                 (struct zfcp_adapter *)shost->hostdata[0];
 485         int status = atomic_read(&adapter->status);
 486
 487         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 488             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 489                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 490         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 491                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 492         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 493                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 494         else
 495                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 496 }
 497
 498 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 499 {
 500         rport->dev_loss_tmo = timeout;
 501 }
 502
 503 /**
 504  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 505  * @rport: The FC rport where to teminate I/O
 506  *
 507  * Abort all pending SCSI commands for a port by closing the
 508  * port. Using a reopen avoids a conflict with a shutdown
 509  * overwriting a reopen. The "forced" ensures that a disappeared port
 510  * is not opened again as valid due to the cached plogi data in
 511  * non-NPIV mode.
 512  */
 513 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 514 {
 515         struct zfcp_port *port;
 516         struct Scsi_Host *shost = rport_to_shost(rport);
 517         struct zfcp_adapter *adapter =
 518                 (struct zfcp_adapter *)shost->hostdata[0];
 519
 520         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 521
 522         if (port) {
 523                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1", NULL);
 524                 put_device(&port->dev);
 525         }
 526 }
 527
 528 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 529 {
 530         struct fc_rport_identifiers ids;
 531         struct fc_rport *rport;
 532
 533         if (port->rport)
 534                 return;
 535
 536         ids.node_name = port->wwnn;
 537         ids.port_name = port->wwpn;
 538         ids.port_id = port->d_id;
 539         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 540
 541         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 542         if (!rport) {
 543                 dev_err(&port->adapter->ccw_device->dev,
 544                         "Registering port 0x%016Lx failed\n",
 545                         (unsigned long long)port->wwpn);
 546                 return;
 547         }
 548
 549         rport->maxframe_size = port->maxframe_size;
 550         rport->supported_classes = port->supported_classes;
 551         port->rport = rport;
 552         port->starget_id = rport->scsi_target_id;
 553
 554         zfcp_unit_queue_scsi_scan(port);
 555 }
 556
 557 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 558 {
 559         struct fc_rport *rport = port->rport;
 560
 561         if (rport) {
 562                 fc_remote_port_delete(rport);
 563                 port->rport = NULL;
 564         }
 565 }
 566
 567 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 568 {
 569         get_device(&port->dev);
 570         port->rport_task = RPORT_ADD;
 571
 572         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 573                 put_device(&port->dev);
 574 }
 575
 576 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 577 {
 578         get_device(&port->dev);
 579         port->rport_task = RPORT_DEL;
 580
 581         if (port->rport && queue_work(port->adapter->work_queue,
 582                                       &port->rport_work))
 583                 return;
 584
 585         put_device(&port->dev);
 586 }
 587
 588 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 589 {
 590         unsigned long flags;
 591         struct zfcp_port *port;
 592
 593         read_lock_irqsave(&adapter->port_list_lock, flags);
 594         list_for_each_entry(port, &adapter->port_list, list)
 595                 zfcp_scsi_schedule_rport_block(port);
 596         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 597 }
 598
 599 void zfcp_scsi_rport_work(struct work_struct *work)
 600 {
 601         struct zfcp_port *port = container_of(work, struct zfcp_port,
 602                                               rport_work);
 603
 604         while (port->rport_task) {
 605                 if (port->rport_task == RPORT_ADD) {
 606                         port->rport_task = RPORT_NONE;
 607                         zfcp_scsi_rport_register(port);
 608                 } else {
 609                         port->rport_task = RPORT_NONE;
 610                         zfcp_scsi_rport_block(port);
 611                 }
 612         }
 613
 614         put_device(&port->dev);
 615 }
 616
 617 /**
 618  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 619  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 620  */
 621 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 622 {
 623         unsigned int mask = 0;
 624         unsigned int data_div;
 625         struct Scsi_Host *shost = adapter->scsi_host;
 626
 627         data_div = atomic_read(&adapter->status) &
 628                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 629
 630         if (enable_dif &&
 631             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 632                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 633
 634         if (enable_dif && data_div &&
 635             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 636                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 637                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 638                 shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
 639                 shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2;
 640         }
 641
 642         scsi_host_set_prot(shost, mask);
 643 }
 644
 645 /**
 646  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 647  * @scmd: The SCSI command to report the error for
 648  * @ascq: The ASCQ to put in the sense buffer
 649  *
 650  * See the error handling in sd_done for the sense codes used here.
 651  * Set DID_SOFT_ERROR to retry the request, if possible.
 652  */
 653 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 654 {
 655         scsi_build_sense_buffer(1, scmd->sense_buffer,
 656                                 ILLEGAL_REQUEST, 0x10, ascq);
 657         set_driver_byte(scmd, DRIVER_SENSE);
 658         scmd->result |= SAM_STAT_CHECK_CONDITION;
 659         set_host_byte(scmd, DID_SOFT_ERROR);
 660 }
 661
 662 struct fc_function_template zfcp_transport_functions = {
 663         .show_starget_port_id = 1,
 664         .show_starget_port_name = 1,
 665         .show_starget_node_name = 1,
 666         .show_rport_supported_classes = 1,
 667         .show_rport_maxframe_size = 1,
 668         .show_rport_dev_loss_tmo = 1,
 669         .show_host_node_name = 1,
 670         .show_host_port_name = 1,
 671         .show_host_permanent_port_name = 1,
 672         .show_host_supported_classes = 1,
 673         .show_host_supported_fc4s = 1,
 674         .show_host_supported_speeds = 1,
 675         .show_host_maxframe_size = 1,
 676         .show_host_serial_number = 1,
 677         .get_fc_host_stats = zfcp_get_fc_host_stats,
 678         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 679         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 680         .get_host_port_state = zfcp_get_host_port_state,
 681         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 682         .show_host_port_state = 1,
 683         .show_host_active_fc4s = 1,
 684         .bsg_request = zfcp_fc_exec_bsg_job,
 685         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 686         /* no functions registered for following dynamic attributes but
 687            directly set by LLDD */
 688         .show_host_port_type = 1,
 689         .show_host_speed = 1,
 690         .show_host_port_id = 1,
 691         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 692 };
 693
 694 struct zfcp_data zfcp_data = {
 695         .scsi_host_template = {
 696                 .name                    = "zfcp",
 697                 .module                  = THIS_MODULE,
 698                 .proc_name               = "zfcp",
 699                 .change_queue_depth      = zfcp_scsi_change_queue_depth,
 700                 .slave_alloc             = zfcp_scsi_slave_alloc,
 701                 .slave_configure         = zfcp_scsi_slave_configure,
 702                 .slave_destroy           = zfcp_scsi_slave_destroy,
 703                 .queuecommand            = zfcp_scsi_queuecommand,
 704                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 705                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 706                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 707                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 708                 .can_queue               = 4096,
 709                 .this_id                 = -1,
 710                 .sg_tablesize            = ZFCP_QDIO_MAX_SBALES_PER_REQ,
 711                 .cmd_per_lun             = 1,
 712                 .use_clustering          = 1,
 713                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 714                 .max_sectors             = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8),
 715                 .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 716                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 717         },
 718 };