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