drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corp. 2002, 2013
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/slab.h>
  15 #include <scsi/fc/fc_fcp.h>
  16 #include <scsi/scsi_eh.h>
  17 #include <linux/atomic.h>
  18 #include "zfcp_ext.h"
  19 #include "zfcp_dbf.h"
  20 #include "zfcp_fc.h"
  21 #include "zfcp_reqlist.h"
  22
  23 static unsigned int default_depth = 32;
  24 module_param_named(queue_depth, default_depth, uint, 0600);
  25 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  26
  27 static bool enable_dif;
  28 module_param_named(dif, enable_dif, bool, 0400);
  29 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  30
  31 static bool allow_lun_scan = 1;
  32 module_param(allow_lun_scan, bool, 0600);
  33 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  34
  35 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  36                                         int reason)
  37 {
  38         switch (reason) {
  39         case SCSI_QDEPTH_DEFAULT:
  40                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  41                 break;
  42         case SCSI_QDEPTH_QFULL:
  43                 scsi_track_queue_full(sdev, depth);
  44                 break;
  45         case SCSI_QDEPTH_RAMP_UP:
  46                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  47                 break;
  48         default:
  49                 return -EOPNOTSUPP;
  50         }
  51         return sdev->queue_depth;
  52 }
  53
  54 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  55 {
  56         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  57
  58         /* if previous slave_alloc returned early, there is nothing to do */
  59         if (!zfcp_sdev->port)
  60                 return;
  61
  62         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  63         put_device(&zfcp_sdev->port->dev);
  64 }
  65
  66 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  67 {
  68         if (sdp->tagged_supported)
  69                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  70         else
  71                 scsi_adjust_queue_depth(sdp, 0, 1);
  72         return 0;
  73 }
  74
  75 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  76 {
  77         set_host_byte(scpnt, result);
  78         zfcp_dbf_scsi_fail_send(scpnt);
  79         scpnt->scsi_done(scpnt);
  80 }
  81
  82 static
  83 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  84 {
  85         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  86         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  87         int    status, scsi_result, ret;
  88
  89         /* reset the status for this request */
  90         scpnt->result = 0;
  91         scpnt->host_scribble = NULL;
  92
  93         scsi_result = fc_remote_port_chkready(rport);
  94         if (unlikely(scsi_result)) {
  95                 scpnt->result = scsi_result;
  96                 zfcp_dbf_scsi_fail_send(scpnt);
  97                 scpnt->scsi_done(scpnt);
  98                 return 0;
  99         }
 100
 101         status = atomic_read(&zfcp_sdev->status);
 102         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
 103                      !(atomic_read(&zfcp_sdev->port->status) &
 104                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
 105                 /* only LUN access denied, but port is good
 106                  * not covered by FC transport, have to fail here */
 107                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 108                 return 0;
 109         }
 110
 111         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
 112                 /* This could be either
 113                  * open LUN pending: this is temporary, will result in
 114                  *      open LUN or ERP_FAILED, so retry command
 115                  * call to rport_delete pending: mimic retry from
 116                  *      fc_remote_port_chkready until rport is BLOCKED
 117                  */
 118                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 119                 return 0;
 120         }
 121
 122         ret = zfcp_fsf_fcp_cmnd(scpnt);
 123         if (unlikely(ret == -EBUSY))
 124                 return SCSI_MLQUEUE_DEVICE_BUSY;
 125         else if (unlikely(ret < 0))
 126                 return SCSI_MLQUEUE_HOST_BUSY;
 127
 128         return ret;
 129 }
 130
 131 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 132 {
 133         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 134         struct zfcp_adapter *adapter =
 135                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 136         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 137         struct zfcp_port *port;
 138         struct zfcp_unit *unit;
 139         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 140
 141         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 142         if (!port)
 143                 return -ENXIO;
 144
 145         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 146         if (unit)
 147                 put_device(&unit->dev);
 148
 149         if (!unit && !(allow_lun_scan && npiv)) {
 150                 put_device(&port->dev);
 151                 return -ENXIO;
 152         }
 153
 154         zfcp_sdev->port = port;
 155         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 156         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 157         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 158         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 159         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 160         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 161         spin_lock_init(&zfcp_sdev->latencies.lock);
 162
 163         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 164         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 165         zfcp_erp_wait(port->adapter);
 166
 167         return 0;
 168 }
 169
 170 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 171 {
 172         struct Scsi_Host *scsi_host = scpnt->device->host;
 173         struct zfcp_adapter *adapter =
 174                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 175         struct zfcp_fsf_req *old_req, *abrt_req;
 176         unsigned long flags;
 177         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 178         int retval = SUCCESS, ret;
 179         int retry = 3;
 180         char *dbf_tag;
 181
 182         /* avoid race condition between late normal completion and abort */
 183         write_lock_irqsave(&adapter->abort_lock, flags);
 184
 185         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 186         if (!old_req) {
 187                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 188                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 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                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 205                         return ret;
 206                 }
 207                 if (!(atomic_read(&adapter->status) &
 208                       ZFCP_STATUS_COMMON_RUNNING)) {
 209                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 210                         return SUCCESS;
 211                 }
 212         }
 213         if (!abrt_req) {
 214                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 215                 return FAILED;
 216         }
 217
 218         wait_for_completion(&abrt_req->completion);
 219
 220         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 221                 dbf_tag = "abrt_ok";
 222         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 223                 dbf_tag = "abrt_nn";
 224         else {
 225                 dbf_tag = "abrt_fa";
 226                 retval = FAILED;
 227         }
 228         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 229         zfcp_fsf_req_free(abrt_req);
 230         return retval;
 231 }
 232
 233 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 234 {
 235         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 236         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 237         struct zfcp_fsf_req *fsf_req = NULL;
 238         int retval = SUCCESS, ret;
 239         int retry = 3;
 240
 241         while (retry--) {
 242                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
 243                 if (fsf_req)
 244                         break;
 245
 246                 zfcp_erp_wait(adapter);
 247                 ret = fc_block_scsi_eh(scpnt);
 248                 if (ret)
 249                         return ret;
 250
 251                 if (!(atomic_read(&adapter->status) &
 252                       ZFCP_STATUS_COMMON_RUNNING)) {
 253                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
 254                         return SUCCESS;
 255                 }
 256         }
 257         if (!fsf_req)
 258                 return FAILED;
 259
 260         wait_for_completion(&fsf_req->completion);
 261
 262         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 263                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
 264                 retval = FAILED;
 265         } else
 266                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
 267
 268         zfcp_fsf_req_free(fsf_req);
 269         return retval;
 270 }
 271
 272 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 273 {
 274         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
 275 }
 276
 277 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 278 {
 279         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
 280 }
 281
 282 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 283 {
 284         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 285         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 286         int ret;
 287
 288         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 289         zfcp_erp_wait(adapter);
 290         ret = fc_block_scsi_eh(scpnt);
 291         if (ret)
 292                 return ret;
 293
 294         return SUCCESS;
 295 }
 296
 297 struct scsi_transport_template *zfcp_scsi_transport_template;
 298
 299 static struct scsi_host_template zfcp_scsi_host_template = {
 300         .module                  = THIS_MODULE,
 301         .name                    = "zfcp",
 302         .queuecommand            = zfcp_scsi_queuecommand,
 303         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 304         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 305         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 306         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 307         .slave_alloc             = zfcp_scsi_slave_alloc,
 308         .slave_configure         = zfcp_scsi_slave_configure,
 309         .slave_destroy           = zfcp_scsi_slave_destroy,
 310         .change_queue_depth      = zfcp_scsi_change_queue_depth,
 311         .proc_name               = "zfcp",
 312         .can_queue               = 4096,
 313         .this_id                 = -1,
 314         .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 315                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 316                                    /* GCD, adjusted later */
 317         .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 318                                      * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 319                                    /* GCD, adjusted later */
 320         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 321         .cmd_per_lun             = 1,
 322         .use_clustering          = 1,
 323         .shost_attrs             = zfcp_sysfs_shost_attrs,
 324         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 325 };
 326
 327 /**
 328  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 329  * @adapter: The zfcp adapter to register with the SCSI midlayer
 330  */
 331 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 332 {
 333         struct ccw_dev_id dev_id;
 334
 335         if (adapter->scsi_host)
 336                 return 0;
 337
 338         ccw_device_get_id(adapter->ccw_device, &dev_id);
 339         /* register adapter as SCSI host with mid layer of SCSI stack */
 340         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 341                                              sizeof (struct zfcp_adapter *));
 342         if (!adapter->scsi_host) {
 343                 dev_err(&adapter->ccw_device->dev,
 344                         "Registering the FCP device with the "
 345                         "SCSI stack failed\n");
 346                 return -EIO;
 347         }
 348
 349         /* tell the SCSI stack some characteristics of this adapter */
 350         adapter->scsi_host->max_id = 511;
 351         adapter->scsi_host->max_lun = 0xFFFFFFFF;
 352         adapter->scsi_host->max_channel = 0;
 353         adapter->scsi_host->unique_id = dev_id.devno;
 354         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 355         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 356
 357         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 358
 359         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 360                 scsi_host_put(adapter->scsi_host);
 361                 return -EIO;
 362         }
 363
 364         return 0;
 365 }
 366
 367 /**
 368  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 369  * @adapter: The zfcp adapter to unregister.
 370  */
 371 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 372 {
 373         struct Scsi_Host *shost;
 374         struct zfcp_port *port;
 375
 376         shost = adapter->scsi_host;
 377         if (!shost)
 378                 return;
 379
 380         read_lock_irq(&adapter->port_list_lock);
 381         list_for_each_entry(port, &adapter->port_list, list)
 382                 port->rport = NULL;
 383         read_unlock_irq(&adapter->port_list_lock);
 384
 385         fc_remove_host(shost);
 386         scsi_remove_host(shost);
 387         scsi_host_put(shost);
 388         adapter->scsi_host = NULL;
 389 }
 390
 391 static struct fc_host_statistics*
 392 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 393 {
 394         struct fc_host_statistics *fc_stats;
 395
 396         if (!adapter->fc_stats) {
 397                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 398                 if (!fc_stats)
 399                         return NULL;
 400                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
 401         }
 402         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 403         return adapter->fc_stats;
 404 }
 405
 406 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 407                                       struct fsf_qtcb_bottom_port *data,
 408                                       struct fsf_qtcb_bottom_port *old)
 409 {
 410         fc_stats->seconds_since_last_reset =
 411                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 412         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 413         fc_stats->tx_words = data->tx_words - old->tx_words;
 414         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 415         fc_stats->rx_words = data->rx_words - old->rx_words;
 416         fc_stats->lip_count = data->lip - old->lip;
 417         fc_stats->nos_count = data->nos - old->nos;
 418         fc_stats->error_frames = data->error_frames - old->error_frames;
 419         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 420         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 421         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 422         fc_stats->loss_of_signal_count =
 423                 data->loss_of_signal - old->loss_of_signal;
 424         fc_stats->prim_seq_protocol_err_count =
 425                 data->psp_error_counts - old->psp_error_counts;
 426         fc_stats->invalid_tx_word_count =
 427                 data->invalid_tx_words - old->invalid_tx_words;
 428         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 429         fc_stats->fcp_input_requests =
 430                 data->input_requests - old->input_requests;
 431         fc_stats->fcp_output_requests =
 432                 data->output_requests - old->output_requests;
 433         fc_stats->fcp_control_requests =
 434                 data->control_requests - old->control_requests;
 435         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 436         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 437 }
 438
 439 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 440                                    struct fsf_qtcb_bottom_port *data)
 441 {
 442         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 443         fc_stats->tx_frames = data->tx_frames;
 444         fc_stats->tx_words = data->tx_words;
 445         fc_stats->rx_frames = data->rx_frames;
 446         fc_stats->rx_words = data->rx_words;
 447         fc_stats->lip_count = data->lip;
 448         fc_stats->nos_count = data->nos;
 449         fc_stats->error_frames = data->error_frames;
 450         fc_stats->dumped_frames = data->dumped_frames;
 451         fc_stats->link_failure_count = data->link_failure;
 452         fc_stats->loss_of_sync_count = data->loss_of_sync;
 453         fc_stats->loss_of_signal_count = data->loss_of_signal;
 454         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 455         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 456         fc_stats->invalid_crc_count = data->invalid_crcs;
 457         fc_stats->fcp_input_requests = data->input_requests;
 458         fc_stats->fcp_output_requests = data->output_requests;
 459         fc_stats->fcp_control_requests = data->control_requests;
 460         fc_stats->fcp_input_megabytes = data->input_mb;
 461         fc_stats->fcp_output_megabytes = data->output_mb;
 462 }
 463
 464 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 465 {
 466         struct zfcp_adapter *adapter;
 467         struct fc_host_statistics *fc_stats;
 468         struct fsf_qtcb_bottom_port *data;
 469         int ret;
 470
 471         adapter = (struct zfcp_adapter *)host->hostdata[0];
 472         fc_stats = zfcp_init_fc_host_stats(adapter);
 473         if (!fc_stats)
 474                 return NULL;
 475
 476         data = kzalloc(sizeof(*data), GFP_KERNEL);
 477         if (!data)
 478                 return NULL;
 479
 480         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 481         if (ret) {
 482                 kfree(data);
 483                 return NULL;
 484         }
 485
 486         if (adapter->stats_reset &&
 487             ((jiffies/HZ - adapter->stats_reset) <
 488              data->seconds_since_last_reset))
 489                 zfcp_adjust_fc_host_stats(fc_stats, data,
 490                                           adapter->stats_reset_data);
 491         else
 492                 zfcp_set_fc_host_stats(fc_stats, data);
 493
 494         kfree(data);
 495         return fc_stats;
 496 }
 497
 498 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 499 {
 500         struct zfcp_adapter *adapter;
 501         struct fsf_qtcb_bottom_port *data;
 502         int ret;
 503
 504         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 505         data = kzalloc(sizeof(*data), GFP_KERNEL);
 506         if (!data)
 507                 return;
 508
 509         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 510         if (ret)
 511                 kfree(data);
 512         else {
 513                 adapter->stats_reset = jiffies/HZ;
 514                 kfree(adapter->stats_reset_data);
 515                 adapter->stats_reset_data = data; /* finally freed in
 516                                                      adapter_release */
 517         }
 518 }
 519
 520 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 521 {
 522         struct zfcp_adapter *adapter =
 523                 (struct zfcp_adapter *)shost->hostdata[0];
 524         int status = atomic_read(&adapter->status);
 525
 526         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 527             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 528                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 529         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 530                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 531         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 532                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 533         else
 534                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 535 }
 536
 537 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 538 {
 539         rport->dev_loss_tmo = timeout;
 540 }
 541
 542 /**
 543  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 544  * @rport: The FC rport where to teminate I/O
 545  *
 546  * Abort all pending SCSI commands for a port by closing the
 547  * port. Using a reopen avoids a conflict with a shutdown
 548  * overwriting a reopen. The "forced" ensures that a disappeared port
 549  * is not opened again as valid due to the cached plogi data in
 550  * non-NPIV mode.
 551  */
 552 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 553 {
 554         struct zfcp_port *port;
 555         struct Scsi_Host *shost = rport_to_shost(rport);
 556         struct zfcp_adapter *adapter =
 557                 (struct zfcp_adapter *)shost->hostdata[0];
 558
 559         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 560
 561         if (port) {
 562                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 563                 put_device(&port->dev);
 564         }
 565 }
 566
 567 static void zfcp_scsi_rport_register(struct zfcp_port *port)
 568 {
 569         struct fc_rport_identifiers ids;
 570         struct fc_rport *rport;
 571
 572         if (port->rport)
 573                 return;
 574
 575         ids.node_name = port->wwnn;
 576         ids.port_name = port->wwpn;
 577         ids.port_id = port->d_id;
 578         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 579
 580         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 581         if (!rport) {
 582                 dev_err(&port->adapter->ccw_device->dev,
 583                         "Registering port 0x%016Lx failed\n",
 584                         (unsigned long long)port->wwpn);
 585                 return;
 586         }
 587
 588         rport->maxframe_size = port->maxframe_size;
 589         rport->supported_classes = port->supported_classes;
 590         port->rport = rport;
 591         port->starget_id = rport->scsi_target_id;
 592
 593         zfcp_unit_queue_scsi_scan(port);
 594 }
 595
 596 static void zfcp_scsi_rport_block(struct zfcp_port *port)
 597 {
 598         struct fc_rport *rport = port->rport;
 599
 600         if (rport) {
 601                 fc_remote_port_delete(rport);
 602                 port->rport = NULL;
 603         }
 604 }
 605
 606 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 607 {
 608         get_device(&port->dev);
 609         port->rport_task = RPORT_ADD;
 610
 611         if (!queue_work(port->adapter->work_queue, &port->rport_work))
 612                 put_device(&port->dev);
 613 }
 614
 615 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 616 {
 617         get_device(&port->dev);
 618         port->rport_task = RPORT_DEL;
 619
 620         if (port->rport && queue_work(port->adapter->work_queue,
 621                                       &port->rport_work))
 622                 return;
 623
 624         put_device(&port->dev);
 625 }
 626
 627 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 628 {
 629         unsigned long flags;
 630         struct zfcp_port *port;
 631
 632         read_lock_irqsave(&adapter->port_list_lock, flags);
 633         list_for_each_entry(port, &adapter->port_list, list)
 634                 zfcp_scsi_schedule_rport_block(port);
 635         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 636 }
 637
 638 void zfcp_scsi_rport_work(struct work_struct *work)
 639 {
 640         struct zfcp_port *port = container_of(work, struct zfcp_port,
 641                                               rport_work);
 642
 643         while (port->rport_task) {
 644                 if (port->rport_task == RPORT_ADD) {
 645                         port->rport_task = RPORT_NONE;
 646                         zfcp_scsi_rport_register(port);
 647                 } else {
 648                         port->rport_task = RPORT_NONE;
 649                         zfcp_scsi_rport_block(port);
 650                 }
 651         }
 652
 653         put_device(&port->dev);
 654 }
 655
 656 /**
 657  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 658  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 659  */
 660 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 661 {
 662         unsigned int mask = 0;
 663         unsigned int data_div;
 664         struct Scsi_Host *shost = adapter->scsi_host;
 665
 666         data_div = atomic_read(&adapter->status) &
 667                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 668
 669         if (enable_dif &&
 670             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 671                 mask |= SHOST_DIF_TYPE1_PROTECTION;
 672
 673         if (enable_dif && data_div &&
 674             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 675                 mask |= SHOST_DIX_TYPE1_PROTECTION;
 676                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 677                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 678                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 679                 shost->max_sectors = shost->sg_tablesize * 8;
 680         }
 681
 682         scsi_host_set_prot(shost, mask);
 683 }
 684
 685 /**
 686  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 687  * @scmd: The SCSI command to report the error for
 688  * @ascq: The ASCQ to put in the sense buffer
 689  *
 690  * See the error handling in sd_done for the sense codes used here.
 691  * Set DID_SOFT_ERROR to retry the request, if possible.
 692  */
 693 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 694 {
 695         scsi_build_sense_buffer(1, scmd->sense_buffer,
 696                                 ILLEGAL_REQUEST, 0x10, ascq);
 697         set_driver_byte(scmd, DRIVER_SENSE);
 698         scmd->result |= SAM_STAT_CHECK_CONDITION;
 699         set_host_byte(scmd, DID_SOFT_ERROR);
 700 }
 701
 702 struct fc_function_template zfcp_transport_functions = {
 703         .show_starget_port_id = 1,
 704         .show_starget_port_name = 1,
 705         .show_starget_node_name = 1,
 706         .show_rport_supported_classes = 1,
 707         .show_rport_maxframe_size = 1,
 708         .show_rport_dev_loss_tmo = 1,
 709         .show_host_node_name = 1,
 710         .show_host_port_name = 1,
 711         .show_host_permanent_port_name = 1,
 712         .show_host_supported_classes = 1,
 713         .show_host_supported_fc4s = 1,
 714         .show_host_supported_speeds = 1,
 715         .show_host_maxframe_size = 1,
 716         .show_host_serial_number = 1,
 717         .get_fc_host_stats = zfcp_get_fc_host_stats,
 718         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 719         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 720         .get_host_port_state = zfcp_get_host_port_state,
 721         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 722         .show_host_port_state = 1,
 723         .show_host_active_fc4s = 1,
 724         .bsg_request = zfcp_fc_exec_bsg_job,
 725         .bsg_timeout = zfcp_fc_timeout_bsg_job,
 726         /* no functions registered for following dynamic attributes but
 727            directly set by LLDD */
 728         .show_host_port_type = 1,
 729         .show_host_symbolic_name = 1,
 730         .show_host_speed = 1,
 731         .show_host_port_id = 1,
 732         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 733 };