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_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 162         zfcp_erp_lun_reopen(sdev, 0, "scsla_1", NULL);
 163         zfcp_erp_wait(port->adapter);
 164
 165         return 0;
 166 }
 167
 168 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 169 {
 170         struct Scsi_Host *scsi_host = scpnt->device->host;
 171         struct zfcp_adapter *adapter =
 172                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 173         struct zfcp_fsf_req *old_req, *abrt_req;
 174         unsigned long flags;
 175         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 176         int retval = SUCCESS, ret;
 177         int retry = 3;
 178         char *dbf_tag;
 179
 180         /* avoid race condition between late normal completion and abort */
 181         write_lock_irqsave(&adapter->abort_lock, flags);
 182
 183         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 184         if (!old_req) {
 185                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 186                 zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
 187                                     old_reqid);
 188                 return FAILED; /* completion could be in progress */
 189         }
 190         old_req->data = NULL;
 191
 192         /* don't access old fsf_req after releasing the abort_lock */
 193         write_unlock_irqrestore(&adapter->abort_lock, flags);
 194
 195         while (retry--) {
 196                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 197                 if (abrt_req)
 198                         break;
 199
 200                 zfcp_erp_wait(adapter);
 201                 ret = fc_block_scsi_eh(scpnt);
 202                 if (ret)
 203                         return ret;
 204                 if (!(atomic_read(&adapter->status) &
 205                       ZFCP_STATUS_COMMON_RUNNING)) {
 206                         zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
 207                                             old_reqid);
 208                         return SUCCESS;
 209                 }
 210         }
 211         if (!abrt_req)
 212                 return FAILED;
 213
 214         wait_for_completion(&abrt_req->completion);
 215
 216         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 217                 dbf_tag = "okay";
 218         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 219                 dbf_tag = "lte2";
 220         else {
 221                 dbf_tag = "fail";
 222                 retval = FAILED;
 223         }
 224         zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
 225         zfcp_fsf_req_free(abrt_req);
 226         return retval;
 227 }
 228
 229 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 230 {
 231         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 232         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 233         struct zfcp_fsf_req *fsf_req = NULL;
 234         int retval = SUCCESS, ret;
 235         int retry = 3;
 236
 237         while (retry--) {
 238                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 239                 if (fsf_req)
 240                         break;
 241
 242                 zfcp_erp_wait(adapter);
 243                 ret = fc_block_scsi_eh(scpnt);
 244                 if (ret)
 245                         return ret;
 246
 247                 if (!(atomic_read(&adapter->status) &
 248                       ZFCP_STATUS_COMMON_RUNNING)) {
 249                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 250                         return SUCCESS;
 251                 }
 252         }
 253         if (!fsf_req)
 254                 return FAILED;
 255
 256         wait_for_completion(&fsf_req->completion);
 257
 258         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 259                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 260                 retval = FAILED;
 261         } else
 262                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 263
 264         zfcp_fsf_req_free(fsf_req);
 265         return retval;
 266 }
 267
 268 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 269 {
 270         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 271 }
 272
 273 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 274 {
 275         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 276 }
 277
 278 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 279 {
 280         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 281         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 282         int ret;
 283
 284         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
 285         zfcp_erp_wait(adapter);
 286         ret = fc_block_scsi_eh(scpnt);
 287         if (ret)
 288                 return ret;
 289
 290         return SUCCESS;
 291 }
 292
 293 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 294 {
 295         struct ccw_dev_id dev_id;
 296
 297         if (adapter->scsi_host)
 298                 return 0;
 299
 300         ccw_device_get_id(adapter->ccw_device, &dev_id);
 301         /* register adapter as SCSI host with mid layer of SCSI stack */
 302         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 303                                              sizeof (struct zfcp_adapter *));
 304         if (!adapter->scsi_host) {
 305                 dev_err(&adapter->ccw_device->dev,
 306                         "Registering the FCP device with the "
 307                         "SCSI stack failed\n");
 308                 return -EIO;
 309         }
 310
 311         /* tell the SCSI stack some characteristics of this adapter */
 312         adapter->scsi_host->max_id = 511;
 313         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 314         adapter->scsi_host->max_channel = 0;
 315         adapter->scsi_host->unique_id = dev_id.devno;
 316         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 317         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 318
 319         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 320
 321         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 322                 scsi_host_put(adapter->scsi_host);
 323                 return -EIO;
 324         }
 325
 326         return 0;
 327 }
 328
 329 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 330 {
 331         struct Scsi_Host *shost;
 332         struct zfcp_port *port;
 333
 334         shost = adapter->scsi_host;
 335         if (!shost)
 336                 return;
 337
 338         read_lock_irq(&adapter->port_list_lock);
 339         list_for_each_entry(port, &adapter->port_list, list)
 340                 port->rport = NULL;
 341         read_unlock_irq(&adapter->port_list_lock);
 342
 343         fc_remove_host(shost);
 344         scsi_remove_host(shost);
 345         scsi_host_put(shost);
 346         adapter->scsi_host = NULL;
 347
 348         return;
 349 }
 350
 351 static struct fc_host_statistics*
 352 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 353 {
 354         struct fc_host_statistics *fc_stats;
 355
 356         if (!adapter->fc_stats) {
 357                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 358                 if (!fc_stats)
 359                         return NULL;
 360                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 361         }
 362         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 363         return adapter->fc_stats;
 364 }
 365
 366 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 367                                       struct fsf_qtcb_bottom_port *data,
 368                                       struct fsf_qtcb_bottom_port *old)
 369 {
 370         fc_stats->seconds_since_last_reset =
 371                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 372         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 373         fc_stats->tx_words = data->tx_words - old->tx_words;
 374         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 375         fc_stats->rx_words = data->rx_words - old->rx_words;
 376         fc_stats->lip_count = data->lip - old->lip;
 377         fc_stats->nos_count = data->nos - old->nos;
 378         fc_stats->error_frames = data->error_frames - old->error_frames;
 379         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 380         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 381         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 382         fc_stats->loss_of_signal_count =
 383                 data->loss_of_signal - old->loss_of_signal;
 384         fc_stats->prim_seq_protocol_err_count =
 385                 data->psp_error_counts - old->psp_error_counts;
 386         fc_stats->invalid_tx_word_count =
 387                 data->invalid_tx_words - old->invalid_tx_words;
 388         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 389         fc_stats->fcp_input_requests =
 390                 data->input_requests - old->input_requests;
 391         fc_stats->fcp_output_requests =
 392                 data->output_requests - old->output_requests;
 393         fc_stats->fcp_control_requests =
 394                 data->control_requests - old->control_requests;
 395         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 396         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 397 }
 398
 399 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 400                                    struct fsf_qtcb_bottom_port *data)
 401 {
 402         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 403         fc_stats->tx_frames = data->tx_frames;
 404         fc_stats->tx_words = data->tx_words;
 405         fc_stats->rx_frames = data->rx_frames;
 406         fc_stats->rx_words = data->rx_words;
 407         fc_stats->lip_count = data->lip;
 408         fc_stats->nos_count = data->nos;
 409         fc_stats->error_frames = data->error_frames;
 410         fc_stats->dumped_frames = data->dumped_frames;
 411         fc_stats->link_failure_count = data->link_failure;
 412         fc_stats->loss_of_sync_count = data->loss_of_sync;
 413         fc_stats->loss_of_signal_count = data->loss_of_signal;
 414         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 415         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 416         fc_stats->invalid_crc_count = data->invalid_crcs;
 417         fc_stats->fcp_input_requests = data->input_requests;
 418         fc_stats->fcp_output_requests = data->output_requests;
 419         fc_stats->fcp_control_requests = data->control_requests;
 420         fc_stats->fcp_input_megabytes = data->input_mb;
 421         fc_stats->fcp_output_megabytes = data->output_mb;
 422 }
 423
 424 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 425 {
 426         struct zfcp_adapter *adapter;
 427         struct fc_host_statistics *fc_stats;
 428         struct fsf_qtcb_bottom_port *data;
 429         int ret;
 430
 431         adapter = (struct zfcp_adapter *)host->hostdata[0];
 432         fc_stats = zfcp_init_fc_host_stats(adapter);
 433         if (!fc_stats)
 434                 return NULL;
 435
 436         data = kzalloc(sizeof(*data), GFP_KERNEL);
 437         if (!data)
 438                 return NULL;
 439
 440         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 441         if (ret) {
 442                 kfree(data);
 443                 return NULL;
 444         }
 445
 446         if (adapter->stats_reset &&
 447             ((jiffies/HZ - adapter->stats_reset) <
 448              data->seconds_since_last_reset))
 449                 zfcp_adjust_fc_host_stats(fc_stats, data,
 450                                           adapter->stats_reset_data);
 451         else
 452                 zfcp_set_fc_host_stats(fc_stats, data);
 453
 454         kfree(data);
 455         return fc_stats;
 456 }
 457
 458 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 459 {
 460         struct zfcp_adapter *adapter;
 461         struct fsf_qtcb_bottom_port *data;
 462         int ret;
 463
 464         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 465         data = kzalloc(sizeof(*data), GFP_KERNEL);
 466         if (!data)
 467                 return;
 468
 469         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 470         if (ret)
 471                 kfree(data);
 472         else {
 473                 adapter->stats_reset = jiffies/HZ;
 474                 kfree(adapter->stats_reset_data);
 475                 adapter->stats_reset_data = data; /* finally freed in
 476                                                      adapter_release */
 477         }
 478 }
 479
 480 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 481 {
 482         struct zfcp_adapter *adapter =
 483                 (struct zfcp_adapter *)shost->hostdata[0];
 484         int status = atomic_read(&adapter->status);
 485
 486         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 487             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 488                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 489         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 490                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 491         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 492                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 493         else
 494                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 495 }
 496
 497 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 498 {
 499         rport->dev_loss_tmo = timeout;
 500 }
 501
 502 /**
 503  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 504  * @rport: The FC rport where to teminate I/O
 505  *
 506  * Abort all pending SCSI commands for a port by closing the
 507  * port. Using a reopen avoids a conflict with a shutdown
 508  * overwriting a reopen. The "forced" ensures that a disappeared port
 509  * is not opened again as valid due to the cached plogi data in
 510  * non-NPIV mode.
 511  */
 512 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 513 {
 514         struct zfcp_port *port;
 515         struct Scsi_Host *shost = rport_to_shost(rport);
 516         struct zfcp_adapter *adapter =
 517                 (struct zfcp_adapter *)shost->hostdata[0];
 518
 519         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 520
 521         if (port) {
 522                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1", NULL);
 523                 put_device(&port->dev);
 524         }
 525 }
 526
 527 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 528 {
 529         struct fc_rport_identifiers ids;
 530         struct fc_rport *rport;
 531
 532         if (port->rport)
 533                 return;
 534
 535         ids.node_name = port->wwnn;
 536         ids.port_name = port->wwpn;
 537         ids.port_id = port->d_id;
 538         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 539
 540         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 541         if (!rport) {
 542                 dev_err(&port->adapter->ccw_device->dev,
 543                         "Registering port 0x%016Lx failed\n",
 544                         (unsigned long long)port->wwpn);
 545                 return;
 546         }
 547
 548         rport->maxframe_size = port->maxframe_size;
 549         rport->supported_classes = port->supported_classes;
 550         port->rport = rport;
 551         port->starget_id = rport->scsi_target_id;
 552
 553         zfcp_unit_queue_scsi_scan(port);
 554 }
 555
 556 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 557 {
 558         struct fc_rport *rport = port->rport;
 559
 560         if (rport) {
 561                 fc_remote_port_delete(rport);
 562                 port->rport = NULL;
 563         }
 564 }
 565
 566 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 567 {
 568         get_device(&port->dev);
 569         port->rport_task = RPORT_ADD;
 570
 571         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 572                 put_device(&port->dev);
 573 }
 574
 575 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 576 {
 577         get_device(&port->dev);
 578         port->rport_task = RPORT_DEL;
 579
 580         if (port->rport && queue_work(port->adapter->work_queue,
 581                                       &port->rport_work))
 582                 return;
 583
 584         put_device(&port->dev);
 585 }
 586
 587 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 588 {
 589         unsigned long flags;
 590         struct zfcp_port *port;
 591
 592         read_lock_irqsave(&adapter->port_list_lock, flags);
 593         list_for_each_entry(port, &adapter->port_list, list)
 594                 zfcp_scsi_schedule_rport_block(port);
 595         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 596 }
 597
 598 void zfcp_scsi_rport_work(struct work_struct *work)
 599 {
 600         struct zfcp_port *port = container_of(work, struct zfcp_port,
 601                                               rport_work);
 602
 603         while (port->rport_task) {
 604                 if (port->rport_task == RPORT_ADD) {
 605                         port->rport_task = RPORT_NONE;
 606                         zfcp_scsi_rport_register(port);
 607                 } else {
 608                         port->rport_task = RPORT_NONE;
 609                         zfcp_scsi_rport_block(port);
 610                 }
 611         }
 612
 613         put_device(&port->dev);
 614 }
 615
 616 /**
 617  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 618  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 619  */
 620 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 621 {
 622         unsigned int mask = 0;
 623         unsigned int data_div;
 624         struct Scsi_Host *shost = adapter->scsi_host;
 625
 626         data_div = atomic_read(&adapter->status) &
 627                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 628
 629         if (enable_dif &&
 630             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 631                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 632
 633         if (enable_dif && data_div &&
 634             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 635                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 636                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 637                 shost->sg_prot_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
 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 };