SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/scsi/zfcp_fsf.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Implementation of FSF commands.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10
  11 static void zfcp_fsf_request_timeout_handler(unsigned long data)
  12 {
  13         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
  14         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 62,
  15                                 NULL);
  16 }
  17
  18 static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
  19                                  unsigned long timeout)
  20 {
  21         fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
  22         fsf_req->timer.data = (unsigned long) fsf_req->adapter;
  23         fsf_req->timer.expires = jiffies + timeout;
  24         add_timer(&fsf_req->timer);
  25 }
  26
  27 static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
  28 {
  29         BUG_ON(!fsf_req->erp_action);
  30         fsf_req->timer.function = zfcp_erp_timeout_handler;
  31         fsf_req->timer.data = (unsigned long) fsf_req->erp_action;
  32         fsf_req->timer.expires = jiffies + 30 * HZ;
  33         add_timer(&fsf_req->timer);
  34 }
  35
  36 /* association between FSF command and FSF QTCB type */
  37 static u32 fsf_qtcb_type[] = {
  38         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  39         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  40         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  41         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  42         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  43         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  44         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  45         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  46         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  47         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  48         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  49         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  50         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  51 };
  52
  53 static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
  54 {
  55         u16 subtable = table >> 16;
  56         u16 rule = table & 0xffff;
  57         const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };
  58
  59         if (subtable && subtable < ARRAY_SIZE(act_type))
  60                 dev_warn(&adapter->ccw_device->dev,
  61                          "Access denied according to ACT rule type %s, "
  62                          "rule %d\n", act_type[subtable], rule);
  63 }
  64
  65 static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
  66                                         struct zfcp_port *port)
  67 {
  68         struct fsf_qtcb_header *header = &req->qtcb->header;
  69         dev_warn(&req->adapter->ccw_device->dev,
  70                  "Access denied to port 0x%016Lx\n",
  71                  port->wwpn);
  72         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  73         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  74         zfcp_erp_port_access_denied(port, 55, req);
  75         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  76 }
  77
  78 static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
  79                                         struct zfcp_unit *unit)
  80 {
  81         struct fsf_qtcb_header *header = &req->qtcb->header;
  82         dev_warn(&req->adapter->ccw_device->dev,
  83                  "Access denied to unit 0x%016Lx on port 0x%016Lx\n",
  84                  unit->fcp_lun, unit->port->wwpn);
  85         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  86         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  87         zfcp_erp_unit_access_denied(unit, 59, req);
  88         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  89 }
  90
  91 static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
  92 {
  93         dev_err(&req->adapter->ccw_device->dev, "FCP device not "
  94                 "operational because of an unsupported FC class\n");
  95         zfcp_erp_adapter_shutdown(req->adapter, 0, 123, req);
  96         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  97 }
  98
  99 /**
 100  * zfcp_fsf_req_free - free memory used by fsf request
 101  * @fsf_req: pointer to struct zfcp_fsf_req
 102  */
 103 void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
 104 {
 105         if (likely(req->pool)) {
 106                 mempool_free(req, req->pool);
 107                 return;
 108         }
 109
 110         if (req->qtcb) {
 111                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, req);
 112                 return;
 113         }
 114 }
 115
 116 /**
 117  * zfcp_fsf_req_dismiss_all - dismiss all fsf requests
 118  * @adapter: pointer to struct zfcp_adapter
 119  *
 120  * Never ever call this without shutting down the adapter first.
 121  * Otherwise the adapter would continue using and corrupting s390 storage.
 122  * Included BUG_ON() call to ensure this is done.
 123  * ERP is supposed to be the only user of this function.
 124  */
 125 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 126 {
 127         struct zfcp_fsf_req *req, *tmp;
 128         unsigned long flags;
 129         LIST_HEAD(remove_queue);
 130         unsigned int i;
 131
 132         BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
 133         spin_lock_irqsave(&adapter->req_list_lock, flags);
 134         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 135                 list_splice_init(&adapter->req_list[i], &remove_queue);
 136         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 137
 138         list_for_each_entry_safe(req, tmp, &remove_queue, list) {
 139                 list_del(&req->list);
 140                 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 141                 zfcp_fsf_req_complete(req);
 142         }
 143 }
 144
 145 static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
 146 {
 147         struct fsf_status_read_buffer *sr_buf = req->data;
 148         struct zfcp_adapter *adapter = req->adapter;
 149         struct zfcp_port *port;
 150         int d_id = sr_buf->d_id & ZFCP_DID_MASK;
 151         unsigned long flags;
 152
 153         read_lock_irqsave(&zfcp_data.config_lock, flags);
 154         list_for_each_entry(port, &adapter->port_list_head, list)
 155                 if (port->d_id == d_id) {
 156                         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 157                         switch (sr_buf->status_subtype) {
 158                         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 159                                 zfcp_erp_port_reopen(port, 0, 101, req);
 160                                 break;
 161                         case FSF_STATUS_READ_SUB_ERROR_PORT:
 162                                 zfcp_erp_port_shutdown(port, 0, 122, req);
 163                                 break;
 164                         }
 165                         return;
 166                 }
 167         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 168 }
 169
 170 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, u8 id,
 171                                          struct fsf_link_down_info *link_down)
 172 {
 173         struct zfcp_adapter *adapter = req->adapter;
 174
 175         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 176                 return;
 177
 178         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 179
 180         if (!link_down)
 181                 goto out;
 182
 183         switch (link_down->error_code) {
 184         case FSF_PSQ_LINK_NO_LIGHT:
 185                 dev_warn(&req->adapter->ccw_device->dev,
 186                          "There is no light signal from the local "
 187                          "fibre channel cable\n");
 188                 break;
 189         case FSF_PSQ_LINK_WRAP_PLUG:
 190                 dev_warn(&req->adapter->ccw_device->dev,
 191                          "There is a wrap plug instead of a fibre "
 192                          "channel cable\n");
 193                 break;
 194         case FSF_PSQ_LINK_NO_FCP:
 195                 dev_warn(&req->adapter->ccw_device->dev,
 196                          "The adjacent fibre channel node does not "
 197                          "support FCP\n");
 198                 break;
 199         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 200                 dev_warn(&req->adapter->ccw_device->dev,
 201                          "The FCP device is suspended because of a "
 202                          "firmware update\n");
 203                 break;
 204         case FSF_PSQ_LINK_INVALID_WWPN:
 205                 dev_warn(&req->adapter->ccw_device->dev,
 206                          "The FCP device detected a WWPN that is "
 207                          "duplicate or not valid\n");
 208                 break;
 209         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 210                 dev_warn(&req->adapter->ccw_device->dev,
 211                          "The fibre channel fabric does not support NPIV\n");
 212                 break;
 213         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 214                 dev_warn(&req->adapter->ccw_device->dev,
 215                          "The FCP adapter cannot support more NPIV ports\n");
 216                 break;
 217         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 218                 dev_warn(&req->adapter->ccw_device->dev,
 219                          "The adjacent switch cannot support "
 220                          "more NPIV ports\n");
 221                 break;
 222         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 223                 dev_warn(&req->adapter->ccw_device->dev,
 224                          "The FCP adapter could not log in to the "
 225                          "fibre channel fabric\n");
 226                 break;
 227         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 228                 dev_warn(&req->adapter->ccw_device->dev,
 229                          "The WWPN assignment file on the FCP adapter "
 230                          "has been damaged\n");
 231                 break;
 232         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 233                 dev_warn(&req->adapter->ccw_device->dev,
 234                          "The mode table on the FCP adapter "
 235                          "has been damaged\n");
 236                 break;
 237         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 238                 dev_warn(&req->adapter->ccw_device->dev,
 239                          "All NPIV ports on the FCP adapter have "
 240                          "been assigned\n");
 241                 break;
 242         default:
 243                 dev_warn(&req->adapter->ccw_device->dev,
 244                          "The link between the FCP adapter and "
 245                          "the FC fabric is down\n");
 246         }
 247 out:
 248         zfcp_erp_adapter_failed(adapter, id, req);
 249 }
 250
 251 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 252 {
 253         struct fsf_status_read_buffer *sr_buf = req->data;
 254         struct fsf_link_down_info *ldi =
 255                 (struct fsf_link_down_info *) &sr_buf->payload;
 256
 257         switch (sr_buf->status_subtype) {
 258         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 259                 zfcp_fsf_link_down_info_eval(req, 38, ldi);
 260                 break;
 261         case FSF_STATUS_READ_SUB_FDISC_FAILED:
 262                 zfcp_fsf_link_down_info_eval(req, 39, ldi);
 263                 break;
 264         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 265                 zfcp_fsf_link_down_info_eval(req, 40, NULL);
 266         };
 267 }
 268
 269 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 270 {
 271         struct zfcp_adapter *adapter = req->adapter;
 272         struct fsf_status_read_buffer *sr_buf = req->data;
 273
 274         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 275                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, sr_buf);
 276                 mempool_free(sr_buf, adapter->pool.data_status_read);
 277                 zfcp_fsf_req_free(req);
 278                 return;
 279         }
 280
 281         zfcp_hba_dbf_event_fsf_unsol("read", adapter, sr_buf);
 282
 283         switch (sr_buf->status_type) {
 284         case FSF_STATUS_READ_PORT_CLOSED:
 285                 zfcp_fsf_status_read_port_closed(req);
 286                 break;
 287         case FSF_STATUS_READ_INCOMING_ELS:
 288                 zfcp_fc_incoming_els(req);
 289                 break;
 290         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 291                 break;
 292         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 293                 dev_warn(&adapter->ccw_device->dev,
 294                          "The error threshold for checksum statistics "
 295                          "has been exceeded\n");
 296                 break;
 297         case FSF_STATUS_READ_LINK_DOWN:
 298                 zfcp_fsf_status_read_link_down(req);
 299                 break;
 300         case FSF_STATUS_READ_LINK_UP:
 301                 dev_info(&adapter->ccw_device->dev,
 302                          "The local link has been restored\n");
 303                 /* All ports should be marked as ready to run again */
 304                 zfcp_erp_modify_adapter_status(adapter, 30, NULL,
 305                                                ZFCP_STATUS_COMMON_RUNNING,
 306                                                ZFCP_SET);
 307                 zfcp_erp_adapter_reopen(adapter,
 308                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 309                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 310                                         102, req);
 311                 break;
 312         case FSF_STATUS_READ_NOTIFICATION_LOST:
 313                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
 314                         zfcp_erp_adapter_access_changed(adapter, 135, req);
 315                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
 316                         schedule_work(&adapter->scan_work);
 317                 break;
 318         case FSF_STATUS_READ_CFDC_UPDATED:
 319                 zfcp_erp_adapter_access_changed(adapter, 136, req);
 320                 break;
 321         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 322                 adapter->adapter_features = sr_buf->payload.word[0];
 323                 break;
 324         }
 325
 326         mempool_free(sr_buf, adapter->pool.data_status_read);
 327         zfcp_fsf_req_free(req);
 328
 329         atomic_inc(&adapter->stat_miss);
 330         schedule_work(&adapter->stat_work);
 331 }
 332
 333 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 334 {
 335         switch (req->qtcb->header.fsf_status_qual.word[0]) {
 336         case FSF_SQ_FCP_RSP_AVAILABLE:
 337         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 338         case FSF_SQ_NO_RETRY_POSSIBLE:
 339         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 340                 return;
 341         case FSF_SQ_COMMAND_ABORTED:
 342                 req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 343                 break;
 344         case FSF_SQ_NO_RECOM:
 345                 dev_err(&req->adapter->ccw_device->dev,
 346                         "The FCP adapter reported a problem "
 347                         "that cannot be recovered\n");
 348                 zfcp_erp_adapter_shutdown(req->adapter, 0, 121, req);
 349                 break;
 350         }
 351         /* all non-return stats set FSFREQ_ERROR*/
 352         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 353 }
 354
 355 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 356 {
 357         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 358                 return;
 359
 360         switch (req->qtcb->header.fsf_status) {
 361         case FSF_UNKNOWN_COMMAND:
 362                 dev_err(&req->adapter->ccw_device->dev,
 363                         "The FCP adapter does not recognize the command 0x%x\n",
 364                         req->qtcb->header.fsf_command);
 365                 zfcp_erp_adapter_shutdown(req->adapter, 0, 120, req);
 366                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 367                 break;
 368         case FSF_ADAPTER_STATUS_AVAILABLE:
 369                 zfcp_fsf_fsfstatus_qual_eval(req);
 370                 break;
 371         }
 372 }
 373
 374 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 375 {
 376         struct zfcp_adapter *adapter = req->adapter;
 377         struct fsf_qtcb *qtcb = req->qtcb;
 378         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 379
 380         zfcp_hba_dbf_event_fsf_response(req);
 381
 382         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 383                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 384                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 385                 return;
 386         }
 387
 388         switch (qtcb->prefix.prot_status) {
 389         case FSF_PROT_GOOD:
 390         case FSF_PROT_FSF_STATUS_PRESENTED:
 391                 return;
 392         case FSF_PROT_QTCB_VERSION_ERROR:
 393                 dev_err(&adapter->ccw_device->dev,
 394                         "QTCB version 0x%x not supported by FCP adapter "
 395                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
 396                         psq->word[0], psq->word[1]);
 397                 zfcp_erp_adapter_shutdown(adapter, 0, 117, req);
 398                 break;
 399         case FSF_PROT_ERROR_STATE:
 400         case FSF_PROT_SEQ_NUMB_ERROR:
 401                 zfcp_erp_adapter_reopen(adapter, 0, 98, req);
 402                 req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 403                 break;
 404         case FSF_PROT_UNSUPP_QTCB_TYPE:
 405                 dev_err(&adapter->ccw_device->dev,
 406                         "The QTCB type is not supported by the FCP adapter\n");
 407                 zfcp_erp_adapter_shutdown(adapter, 0, 118, req);
 408                 break;
 409         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 410                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 411                                 &adapter->status);
 412                 break;
 413         case FSF_PROT_DUPLICATE_REQUEST_ID:
 414                 dev_err(&adapter->ccw_device->dev,
 415                         "0x%Lx is an ambiguous request identifier\n",
 416                         (unsigned long long)qtcb->bottom.support.req_handle);
 417                 zfcp_erp_adapter_shutdown(adapter, 0, 78, req);
 418                 break;
 419         case FSF_PROT_LINK_DOWN:
 420                 zfcp_fsf_link_down_info_eval(req, 37, &psq->link_down_info);
 421                 /* FIXME: reopening adapter now? better wait for link up */
 422                 zfcp_erp_adapter_reopen(adapter, 0, 79, req);
 423                 break;
 424         case FSF_PROT_REEST_QUEUE:
 425                 /* All ports should be marked as ready to run again */
 426                 zfcp_erp_modify_adapter_status(adapter, 28, NULL,
 427                                                ZFCP_STATUS_COMMON_RUNNING,
 428                                                ZFCP_SET);
 429                 zfcp_erp_adapter_reopen(adapter,
 430                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 431                                         ZFCP_STATUS_COMMON_ERP_FAILED, 99, req);
 432                 break;
 433         default:
 434                 dev_err(&adapter->ccw_device->dev,
 435                         "0x%x is not a valid transfer protocol status\n",
 436                         qtcb->prefix.prot_status);
 437                 zfcp_erp_adapter_shutdown(adapter, 0, 119, req);
 438         }
 439         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 440 }
 441
 442 /**
 443  * zfcp_fsf_req_complete - process completion of a FSF request
 444  * @fsf_req: The FSF request that has been completed.
 445  *
 446  * When a request has been completed either from the FCP adapter,
 447  * or it has been dismissed due to a queue shutdown, this function
 448  * is called to process the completion status and trigger further
 449  * events related to the FSF request.
 450  */
 451 void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 452 {
 453         if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 454                 zfcp_fsf_status_read_handler(req);
 455                 return;
 456         }
 457
 458         del_timer(&req->timer);
 459         zfcp_fsf_protstatus_eval(req);
 460         zfcp_fsf_fsfstatus_eval(req);
 461         req->handler(req);
 462
 463         if (req->erp_action)
 464                 zfcp_erp_notify(req->erp_action, 0);
 465         req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 466
 467         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 468                 zfcp_fsf_req_free(req);
 469         else
 470         /* notify initiator waiting for the requests completion */
 471         /*
 472          * FIXME: Race! We must not access fsf_req here as it might have been
 473          * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 474          * flag. It's an improbable case. But, we have the same paranoia for
 475          * the cleanup flag already.
 476          * Might better be handled using complete()?
 477          * (setting the flag and doing wakeup ought to be atomic
 478          *  with regard to checking the flag as long as waitqueue is
 479          *  part of the to be released structure)
 480          */
 481                 wake_up(&req->completion_wq);
 482 }
 483
 484 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 485 {
 486         struct fsf_qtcb_bottom_config *bottom;
 487         struct zfcp_adapter *adapter = req->adapter;
 488         struct Scsi_Host *shost = adapter->scsi_host;
 489
 490         bottom = &req->qtcb->bottom.config;
 491
 492         if (req->data)
 493                 memcpy(req->data, bottom, sizeof(*bottom));
 494
 495         fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
 496         fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
 497         fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
 498         fc_host_speed(shost) = bottom->fc_link_speed;
 499         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 500
 501         adapter->hydra_version = bottom->adapter_type;
 502         adapter->timer_ticks = bottom->timer_interval;
 503
 504         if (fc_host_permanent_port_name(shost) == -1)
 505                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 506
 507         switch (bottom->fc_topology) {
 508         case FSF_TOPO_P2P:
 509                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
 510                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
 511                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
 512                 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
 513                 break;
 514         case FSF_TOPO_FABRIC:
 515                 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
 516                 break;
 517         case FSF_TOPO_AL:
 518                 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
 519         default:
 520                 dev_err(&adapter->ccw_device->dev,
 521                         "Unknown or unsupported arbitrated loop "
 522                         "fibre channel topology detected\n");
 523                 zfcp_erp_adapter_shutdown(adapter, 0, 127, req);
 524                 return -EIO;
 525         }
 526
 527         return 0;
 528 }
 529
 530 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 531 {
 532         struct zfcp_adapter *adapter = req->adapter;
 533         struct fsf_qtcb *qtcb = req->qtcb;
 534         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 535         struct Scsi_Host *shost = adapter->scsi_host;
 536
 537         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 538                 return;
 539
 540         adapter->fsf_lic_version = bottom->lic_version;
 541         adapter->adapter_features = bottom->adapter_features;
 542         adapter->connection_features = bottom->connection_features;
 543         adapter->peer_wwpn = 0;
 544         adapter->peer_wwnn = 0;
 545         adapter->peer_d_id = 0;
 546
 547         switch (qtcb->header.fsf_status) {
 548         case FSF_GOOD:
 549                 if (zfcp_fsf_exchange_config_evaluate(req))
 550                         return;
 551
 552                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 553                         dev_err(&adapter->ccw_device->dev,
 554                                 "FCP adapter maximum QTCB size (%d bytes) "
 555                                 "is too small\n",
 556                                 bottom->max_qtcb_size);
 557                         zfcp_erp_adapter_shutdown(adapter, 0, 129, req);
 558                         return;
 559                 }
 560                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 561                                 &adapter->status);
 562                 break;
 563         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 564                 fc_host_node_name(shost) = 0;
 565                 fc_host_port_name(shost) = 0;
 566                 fc_host_port_id(shost) = 0;
 567                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 568                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 569                 adapter->hydra_version = 0;
 570
 571                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 572                                 &adapter->status);
 573
 574                 zfcp_fsf_link_down_info_eval(req, 42,
 575                         &qtcb->header.fsf_status_qual.link_down_info);
 576                 break;
 577         default:
 578                 zfcp_erp_adapter_shutdown(adapter, 0, 130, req);
 579                 return;
 580         }
 581
 582         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 583                 adapter->hardware_version = bottom->hardware_version;
 584                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
 585                        min(FC_SERIAL_NUMBER_SIZE, 17));
 586                 EBCASC(fc_host_serial_number(shost),
 587                        min(FC_SERIAL_NUMBER_SIZE, 17));
 588         }
 589
 590         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 591                 dev_err(&adapter->ccw_device->dev,
 592                         "The FCP adapter only supports newer "
 593                         "control block versions\n");
 594                 zfcp_erp_adapter_shutdown(adapter, 0, 125, req);
 595                 return;
 596         }
 597         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 598                 dev_err(&adapter->ccw_device->dev,
 599                         "The FCP adapter only supports older "
 600                         "control block versions\n");
 601                 zfcp_erp_adapter_shutdown(adapter, 0, 126, req);
 602         }
 603 }
 604
 605 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 606 {
 607         struct zfcp_adapter *adapter = req->adapter;
 608         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 609         struct Scsi_Host *shost = adapter->scsi_host;
 610
 611         if (req->data)
 612                 memcpy(req->data, bottom, sizeof(*bottom));
 613
 614         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 615                 fc_host_permanent_port_name(shost) = bottom->wwpn;
 616         else
 617                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 618         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 619         fc_host_supported_speeds(shost) = bottom->supported_speed;
 620 }
 621
 622 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 623 {
 624         struct zfcp_adapter *adapter = req->adapter;
 625         struct fsf_qtcb *qtcb = req->qtcb;
 626
 627         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 628                 return;
 629
 630         switch (qtcb->header.fsf_status) {
 631         case FSF_GOOD:
 632                 zfcp_fsf_exchange_port_evaluate(req);
 633                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
 634                 break;
 635         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 636                 zfcp_fsf_exchange_port_evaluate(req);
 637                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
 638                 zfcp_fsf_link_down_info_eval(req, 43,
 639                         &qtcb->header.fsf_status_qual.link_down_info);
 640                 break;
 641         }
 642 }
 643
 644 static int zfcp_fsf_sbal_check(struct zfcp_qdio_queue *queue)
 645 {
 646         spin_lock_bh(&queue->lock);
 647         if (atomic_read(&queue->count))
 648                 return 1;
 649         spin_unlock_bh(&queue->lock);
 650         return 0;
 651 }
 652
 653 static int zfcp_fsf_sbal_available(struct zfcp_adapter *adapter)
 654 {
 655         unsigned int count = atomic_read(&adapter->req_q.count);
 656         if (!count)
 657                 atomic_inc(&adapter->qdio_outb_full);
 658         return count > 0;
 659 }
 660
 661 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 662 {
 663         long ret;
 664         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 665
 666         spin_unlock_bh(&req_q->lock);
 667         ret = wait_event_interruptible_timeout(adapter->request_wq,
 668                                         zfcp_fsf_sbal_check(req_q), 5 * HZ);
 669         if (ret > 0)
 670                 return 0;
 671         if (!ret)
 672                 atomic_inc(&adapter->qdio_outb_full);
 673
 674         spin_lock_bh(&req_q->lock);
 675         return -EIO;
 676 }
 677
 678 static struct zfcp_fsf_req *zfcp_fsf_alloc_noqtcb(mempool_t *pool)
 679 {
 680         struct zfcp_fsf_req *req;
 681         req = mempool_alloc(pool, GFP_ATOMIC);
 682         if (!req)
 683                 return NULL;
 684         memset(req, 0, sizeof(*req));
 685         return req;
 686 }
 687
 688 static struct zfcp_fsf_req *zfcp_fsf_alloc_qtcb(mempool_t *pool)
 689 {
 690         struct zfcp_fsf_req_qtcb *qtcb;
 691
 692         if (likely(pool))
 693                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
 694         else
 695                 qtcb = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 696                                         GFP_ATOMIC);
 697         if (unlikely(!qtcb))
 698                 return NULL;
 699
 700         memset(qtcb, 0, sizeof(*qtcb));
 701         qtcb->fsf_req.qtcb = &qtcb->qtcb;
 702         qtcb->fsf_req.pool = pool;
 703
 704         return &qtcb->fsf_req;
 705 }
 706
 707 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
 708                                                 u32 fsf_cmd, int req_flags,
 709                                                 mempool_t *pool)
 710 {
 711         volatile struct qdio_buffer_element *sbale;
 712
 713         struct zfcp_fsf_req *req;
 714         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 715
 716         if (req_flags & ZFCP_REQ_NO_QTCB)
 717                 req = zfcp_fsf_alloc_noqtcb(pool);
 718         else
 719                 req = zfcp_fsf_alloc_qtcb(pool);
 720
 721         if (unlikely(!req))
 722                 return ERR_PTR(-EIO);
 723
 724         if (adapter->req_no == 0)
 725                 adapter->req_no++;
 726
 727         INIT_LIST_HEAD(&req->list);
 728         init_timer(&req->timer);
 729         init_waitqueue_head(&req->completion_wq);
 730
 731         req->adapter = adapter;
 732         req->fsf_command = fsf_cmd;
 733         req->req_id = adapter->req_no++;
 734         req->sbal_number = 1;
 735         req->sbal_first = req_q->first;
 736         req->sbal_last = req_q->first;
 737         req->sbale_curr = 1;
 738
 739         sbale = zfcp_qdio_sbale_req(req);
 740         sbale[0].addr = (void *) req->req_id;
 741         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 742
 743         if (likely(req->qtcb)) {
 744                 req->qtcb->prefix.req_seq_no = req->adapter->fsf_req_seq_no;
 745                 req->qtcb->prefix.req_id = req->req_id;
 746                 req->qtcb->prefix.ulp_info = 26;
 747                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command];
 748                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
 749                 req->qtcb->header.req_handle = req->req_id;
 750                 req->qtcb->header.fsf_command = req->fsf_command;
 751                 req->seq_no = adapter->fsf_req_seq_no;
 752                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 753                 sbale[1].addr = (void *) req->qtcb;
 754                 sbale[1].length = sizeof(struct fsf_qtcb);
 755         }
 756
 757         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) {
 758                 zfcp_fsf_req_free(req);
 759                 return ERR_PTR(-EIO);
 760         }
 761
 762         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP))
 763                 req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
 764
 765         return req;
 766 }
 767
 768 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 769 {
 770         struct zfcp_adapter *adapter = req->adapter;
 771         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 772         int idx;
 773
 774         /* put allocated FSF request into hash table */
 775         spin_lock(&adapter->req_list_lock);
 776         idx = zfcp_reqlist_hash(req->req_id);
 777         list_add_tail(&req->list, &adapter->req_list[idx]);
 778         spin_unlock(&adapter->req_list_lock);
 779
 780         req->issued = get_clock();
 781         if (zfcp_qdio_send(req)) {
 782                 /* Queues are down..... */
 783                 del_timer(&req->timer);
 784                 spin_lock(&adapter->req_list_lock);
 785                 zfcp_reqlist_remove(adapter, req);
 786                 spin_unlock(&adapter->req_list_lock);
 787                 /* undo changes in request queue made for this request */
 788                 atomic_add(req->sbal_number, &req_q->count);
 789                 req_q->first -= req->sbal_number;
 790                 req_q->first += QDIO_MAX_BUFFERS_PER_Q;
 791                 req_q->first %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
 792                 zfcp_erp_adapter_reopen(adapter, 0, 116, req);
 793                 return -EIO;
 794         }
 795
 796         /* Don't increase for unsolicited status */
 797         if (req->qtcb)
 798                 adapter->fsf_req_seq_no++;
 799
 800         return 0;
 801 }
 802
 803 /**
 804  * zfcp_fsf_status_read - send status read request
 805  * @adapter: pointer to struct zfcp_adapter
 806  * @req_flags: request flags
 807  * Returns: 0 on success, ERROR otherwise
 808  */
 809 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 810 {
 811         struct zfcp_fsf_req *req;
 812         struct fsf_status_read_buffer *sr_buf;
 813         volatile struct qdio_buffer_element *sbale;
 814         int retval = -EIO;
 815
 816         spin_lock_bh(&adapter->req_q.lock);
 817         if (zfcp_fsf_req_sbal_get(adapter))
 818                 goto out;
 819
 820         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 821                                   ZFCP_REQ_NO_QTCB,
 822                                   adapter->pool.fsf_req_status_read);
 823         if (IS_ERR(req)) {
 824                 retval = PTR_ERR(req);
 825                 goto out;
 826         }
 827
 828         sbale = zfcp_qdio_sbale_req(req);
 829         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 830         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 831         req->sbale_curr = 2;
 832
 833         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 834         if (!sr_buf) {
 835                 retval = -ENOMEM;
 836                 goto failed_buf;
 837         }
 838         memset(sr_buf, 0, sizeof(*sr_buf));
 839         req->data = sr_buf;
 840         sbale = zfcp_qdio_sbale_curr(req);
 841         sbale->addr = (void *) sr_buf;
 842         sbale->length = sizeof(*sr_buf);
 843
 844         retval = zfcp_fsf_req_send(req);
 845         if (retval)
 846                 goto failed_req_send;
 847
 848         goto out;
 849
 850 failed_req_send:
 851         mempool_free(sr_buf, adapter->pool.data_status_read);
 852 failed_buf:
 853         zfcp_fsf_req_free(req);
 854         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 855 out:
 856         spin_unlock_bh(&adapter->req_q.lock);
 857         return retval;
 858 }
 859
 860 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 861 {
 862         struct zfcp_unit *unit = req->data;
 863         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 864
 865         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 866                 return;
 867
 868         switch (req->qtcb->header.fsf_status) {
 869         case FSF_PORT_HANDLE_NOT_VALID:
 870                 if (fsq->word[0] == fsq->word[1]) {
 871                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
 872                                                 req);
 873                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 874                 }
 875                 break;
 876         case FSF_LUN_HANDLE_NOT_VALID:
 877                 if (fsq->word[0] == fsq->word[1]) {
 878                         zfcp_erp_port_reopen(unit->port, 0, 105, req);
 879                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 880                 }
 881                 break;
 882         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 883                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 884                 break;
 885         case FSF_PORT_BOXED:
 886                 zfcp_erp_port_boxed(unit->port, 47, req);
 887                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 888                                ZFCP_STATUS_FSFREQ_RETRY;
 889                 break;
 890         case FSF_LUN_BOXED:
 891                 zfcp_erp_unit_boxed(unit, 48, req);
 892                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 893                                ZFCP_STATUS_FSFREQ_RETRY;
 894                 break;
 895         case FSF_ADAPTER_STATUS_AVAILABLE:
 896                 switch (fsq->word[0]) {
 897                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 898                         zfcp_test_link(unit->port);
 899                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 900                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 901                         break;
 902                 }
 903                 break;
 904         case FSF_GOOD:
 905                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 906                 break;
 907         }
 908 }
 909
 910 /**
 911  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 912  * @old_req_id: unsigned long
 913  * @adapter: pointer to struct zfcp_adapter
 914  * @unit: pointer to struct zfcp_unit
 915  * @req_flags: integer specifying the request flags
 916  * Returns: pointer to struct zfcp_fsf_req
 917  *
 918  * FIXME(design): should be watched by a timeout !!!
 919  */
 920
 921 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 922                                                 struct zfcp_adapter *adapter,
 923                                                 struct zfcp_unit *unit,
 924                                                 int req_flags)
 925 {
 926         volatile struct qdio_buffer_element *sbale;
 927         struct zfcp_fsf_req *req = NULL;
 928
 929         spin_lock(&adapter->req_q.lock);
 930         if (!zfcp_fsf_sbal_available(adapter))
 931                 goto out;
 932         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 933                                   req_flags, adapter->pool.fsf_req_abort);
 934         if (IS_ERR(req))
 935                 goto out;
 936
 937         if (unlikely(!(atomic_read(&unit->status) &
 938                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 939                 goto out_error_free;
 940
 941         sbale = zfcp_qdio_sbale_req(req);
 942         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 943         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 944
 945         req->data = unit;
 946         req->handler = zfcp_fsf_abort_fcp_command_handler;
 947         req->qtcb->header.lun_handle = unit->handle;
 948         req->qtcb->header.port_handle = unit->port->handle;
 949         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 950
 951         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 952         if (!zfcp_fsf_req_send(req))
 953                 goto out;
 954
 955 out_error_free:
 956         zfcp_fsf_req_free(req);
 957         req = NULL;
 958 out:
 959         spin_unlock(&adapter->req_q.lock);
 960         return req;
 961 }
 962
 963 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 964 {
 965         struct zfcp_adapter *adapter = req->adapter;
 966         struct zfcp_send_ct *send_ct = req->data;
 967         struct zfcp_port *port = send_ct->port;
 968         struct fsf_qtcb_header *header = &req->qtcb->header;
 969
 970         send_ct->status = -EINVAL;
 971
 972         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 973                 goto skip_fsfstatus;
 974
 975         switch (header->fsf_status) {
 976         case FSF_GOOD:
 977                 zfcp_san_dbf_event_ct_response(req);
 978                 send_ct->status = 0;
 979                 break;
 980         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 981                 zfcp_fsf_class_not_supp(req);
 982                 break;
 983         case FSF_ADAPTER_STATUS_AVAILABLE:
 984                 switch (header->fsf_status_qual.word[0]){
 985                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 986                         zfcp_test_link(port);
 987                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 988                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 989                         break;
 990                 }
 991                 break;
 992         case FSF_ACCESS_DENIED:
 993                 zfcp_fsf_access_denied_port(req, port);
 994                 break;
 995         case FSF_PORT_BOXED:
 996                 zfcp_erp_port_boxed(port, 49, req);
 997                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 998                                ZFCP_STATUS_FSFREQ_RETRY;
 999                 break;
1000         case FSF_PORT_HANDLE_NOT_VALID:
1001                 zfcp_erp_adapter_reopen(adapter, 0, 106, req);
1002         case FSF_GENERIC_COMMAND_REJECTED:
1003         case FSF_PAYLOAD_SIZE_MISMATCH:
1004         case FSF_REQUEST_SIZE_TOO_LARGE:
1005         case FSF_RESPONSE_SIZE_TOO_LARGE:
1006         case FSF_SBAL_MISMATCH:
1007                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1008                 break;
1009         }
1010
1011 skip_fsfstatus:
1012         if (send_ct->handler)
1013                 send_ct->handler(send_ct->handler_data);
1014 }
1015
1016 static int zfcp_fsf_setup_sbals(struct zfcp_fsf_req *req,
1017                                 struct scatterlist *sg_req,
1018                                 struct scatterlist *sg_resp, int max_sbals)
1019 {
1020         int bytes;
1021
1022         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1023                                         sg_req, max_sbals);
1024         if (bytes <= 0)
1025                 return -ENOMEM;
1026         req->qtcb->bottom.support.req_buf_length = bytes;
1027         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1028
1029         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1030                                         sg_resp, max_sbals);
1031         if (bytes <= 0)
1032                 return -ENOMEM;
1033         req->qtcb->bottom.support.resp_buf_length = bytes;
1034
1035         return 0;
1036 }
1037
1038 /**
1039  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1040  * @ct: pointer to struct zfcp_send_ct with data for request
1041  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1042  * @erp_action: if non-null the Generic Service request sent within ERP
1043  */
1044 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1045                      struct zfcp_erp_action *erp_action)
1046 {
1047         struct zfcp_port *port = ct->port;
1048         struct zfcp_adapter *adapter = port->adapter;
1049         struct zfcp_fsf_req *req;
1050         int ret = -EIO;
1051
1052         spin_lock_bh(&adapter->req_q.lock);
1053         if (zfcp_fsf_req_sbal_get(adapter))
1054                 goto out;
1055
1056         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1057                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1058         if (IS_ERR(req)) {
1059                 ret = PTR_ERR(req);
1060                 goto out;
1061         }
1062
1063         ret = zfcp_fsf_setup_sbals(req, ct->req, ct->resp,
1064                                    FSF_MAX_SBALS_PER_REQ);
1065         if (ret)
1066                 goto failed_send;
1067
1068         req->handler = zfcp_fsf_send_ct_handler;
1069         req->qtcb->header.port_handle = port->handle;
1070         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1071         req->qtcb->bottom.support.timeout = ct->timeout;
1072         req->data = ct;
1073
1074         zfcp_san_dbf_event_ct_request(req);
1075
1076         if (erp_action) {
1077                 erp_action->fsf_req = req;
1078                 req->erp_action = erp_action;
1079                 zfcp_fsf_start_erp_timer(req);
1080         } else
1081                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1082
1083         ret = zfcp_fsf_req_send(req);
1084         if (ret)
1085                 goto failed_send;
1086
1087         goto out;
1088
1089 failed_send:
1090         zfcp_fsf_req_free(req);
1091         if (erp_action)
1092                 erp_action->fsf_req = NULL;
1093 out:
1094         spin_unlock_bh(&adapter->req_q.lock);
1095         return ret;
1096 }
1097
1098 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1099 {
1100         struct zfcp_send_els *send_els = req->data;
1101         struct zfcp_port *port = send_els->port;
1102         struct fsf_qtcb_header *header = &req->qtcb->header;
1103
1104         send_els->status = -EINVAL;
1105
1106         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1107                 goto skip_fsfstatus;
1108
1109         switch (header->fsf_status) {
1110         case FSF_GOOD:
1111                 zfcp_san_dbf_event_els_response(req);
1112                 send_els->status = 0;
1113                 break;
1114         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1115                 zfcp_fsf_class_not_supp(req);
1116                 break;
1117         case FSF_ADAPTER_STATUS_AVAILABLE:
1118                 switch (header->fsf_status_qual.word[0]){
1119                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1120                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1121                                 zfcp_test_link(port);
1122                         /*fall through */
1123                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1124                 case FSF_SQ_RETRY_IF_POSSIBLE:
1125                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1126                         break;
1127                 }
1128                 break;
1129         case FSF_ELS_COMMAND_REJECTED:
1130         case FSF_PAYLOAD_SIZE_MISMATCH:
1131         case FSF_REQUEST_SIZE_TOO_LARGE:
1132         case FSF_RESPONSE_SIZE_TOO_LARGE:
1133                 break;
1134         case FSF_ACCESS_DENIED:
1135                 zfcp_fsf_access_denied_port(req, port);
1136                 break;
1137         case FSF_SBAL_MISMATCH:
1138                 /* should never occure, avoided in zfcp_fsf_send_els */
1139                 /* fall through */
1140         default:
1141                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1142                 break;
1143         }
1144 skip_fsfstatus:
1145         if (send_els->handler)
1146                 send_els->handler(send_els->handler_data);
1147 }
1148
1149 /**
1150  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1151  * @els: pointer to struct zfcp_send_els with data for the command
1152  */
1153 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1154 {
1155         struct zfcp_fsf_req *req;
1156         struct zfcp_adapter *adapter = els->adapter;
1157         struct fsf_qtcb_bottom_support *bottom;
1158         int ret = -EIO;
1159
1160         if (unlikely(!(atomic_read(&els->port->status) &
1161                        ZFCP_STATUS_COMMON_UNBLOCKED)))
1162                 return -EBUSY;
1163
1164         spin_lock(&adapter->req_q.lock);
1165         if (!zfcp_fsf_sbal_available(adapter))
1166                 goto out;
1167         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1168                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1169         if (IS_ERR(req)) {
1170                 ret = PTR_ERR(req);
1171                 goto out;
1172         }
1173
1174         ret = zfcp_fsf_setup_sbals(req, els->req, els->resp,
1175                                    FSF_MAX_SBALS_PER_ELS_REQ);
1176         if (ret)
1177                 goto failed_send;
1178
1179         bottom = &req->qtcb->bottom.support;
1180         req->handler = zfcp_fsf_send_els_handler;
1181         bottom->d_id = els->d_id;
1182         bottom->service_class = FSF_CLASS_3;
1183         bottom->timeout = 2 * R_A_TOV;
1184         req->data = els;
1185
1186         zfcp_san_dbf_event_els_request(req);
1187
1188         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1189         ret = zfcp_fsf_req_send(req);
1190         if (ret)
1191                 goto failed_send;
1192
1193         goto out;
1194
1195 failed_send:
1196         zfcp_fsf_req_free(req);
1197 out:
1198         spin_unlock(&adapter->req_q.lock);
1199         return ret;
1200 }
1201
1202 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1203 {
1204         volatile struct qdio_buffer_element *sbale;
1205         struct zfcp_fsf_req *req;
1206         struct zfcp_adapter *adapter = erp_action->adapter;
1207         int retval = -EIO;
1208
1209         spin_lock_bh(&adapter->req_q.lock);
1210         if (!zfcp_fsf_sbal_available(adapter))
1211                 goto out;
1212         req = zfcp_fsf_req_create(adapter,
1213                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1214                                   ZFCP_REQ_AUTO_CLEANUP,
1215                                   adapter->pool.fsf_req_erp);
1216         if (IS_ERR(req)) {
1217                 retval = PTR_ERR(req);
1218                 goto out;
1219         }
1220
1221         sbale = zfcp_qdio_sbale_req(req);
1222         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1223         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1224
1225         req->qtcb->bottom.config.feature_selection =
1226                         FSF_FEATURE_CFDC |
1227                         FSF_FEATURE_LUN_SHARING |
1228                         FSF_FEATURE_NOTIFICATION_LOST |
1229                         FSF_FEATURE_UPDATE_ALERT;
1230         req->erp_action = erp_action;
1231         req->handler = zfcp_fsf_exchange_config_data_handler;
1232         erp_action->fsf_req = req;
1233
1234         zfcp_fsf_start_erp_timer(req);
1235         retval = zfcp_fsf_req_send(req);
1236         if (retval) {
1237                 zfcp_fsf_req_free(req);
1238                 erp_action->fsf_req = NULL;
1239         }
1240 out:
1241         spin_unlock_bh(&adapter->req_q.lock);
1242         return retval;
1243 }
1244
1245 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1246                                        struct fsf_qtcb_bottom_config *data)
1247 {
1248         volatile struct qdio_buffer_element *sbale;
1249         struct zfcp_fsf_req *req = NULL;
1250         int retval = -EIO;
1251
1252         spin_lock_bh(&adapter->req_q.lock);
1253         if (zfcp_fsf_req_sbal_get(adapter))
1254                 goto out;
1255
1256         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1257                                   0, NULL);
1258         if (IS_ERR(req)) {
1259                 retval = PTR_ERR(req);
1260                 goto out;
1261         }
1262
1263         sbale = zfcp_qdio_sbale_req(req);
1264         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1265         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1266         req->handler = zfcp_fsf_exchange_config_data_handler;
1267
1268         req->qtcb->bottom.config.feature_selection =
1269                         FSF_FEATURE_CFDC |
1270                         FSF_FEATURE_LUN_SHARING |
1271                         FSF_FEATURE_NOTIFICATION_LOST |
1272                         FSF_FEATURE_UPDATE_ALERT;
1273
1274         if (data)
1275                 req->data = data;
1276
1277         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1278         retval = zfcp_fsf_req_send(req);
1279 out:
1280         spin_unlock_bh(&adapter->req_q.lock);
1281         if (!retval)
1282                 wait_event(req->completion_wq,
1283                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1284
1285         zfcp_fsf_req_free(req);
1286
1287         return retval;
1288 }
1289
1290 /**
1291  * zfcp_fsf_exchange_port_data - request information about local port
1292  * @erp_action: ERP action for the adapter for which port data is requested
1293  * Returns: 0 on success, error otherwise
1294  */
1295 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1296 {
1297         volatile struct qdio_buffer_element *sbale;
1298         struct zfcp_fsf_req *req;
1299         struct zfcp_adapter *adapter = erp_action->adapter;
1300         int retval = -EIO;
1301
1302         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1303                 return -EOPNOTSUPP;
1304
1305         spin_lock_bh(&adapter->req_q.lock);
1306         if (!zfcp_fsf_sbal_available(adapter))
1307                 goto out;
1308         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1309                                   ZFCP_REQ_AUTO_CLEANUP,
1310                                   adapter->pool.fsf_req_erp);
1311         if (IS_ERR(req)) {
1312                 retval = PTR_ERR(req);
1313                 goto out;
1314         }
1315
1316         sbale = zfcp_qdio_sbale_req(req);
1317         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1318         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1319
1320         req->handler = zfcp_fsf_exchange_port_data_handler;
1321         req->erp_action = erp_action;
1322         erp_action->fsf_req = req;
1323
1324         zfcp_fsf_start_erp_timer(req);
1325         retval = zfcp_fsf_req_send(req);
1326         if (retval) {
1327                 zfcp_fsf_req_free(req);
1328                 erp_action->fsf_req = NULL;
1329         }
1330 out:
1331         spin_unlock_bh(&adapter->req_q.lock);
1332         return retval;
1333 }
1334
1335 /**
1336  * zfcp_fsf_exchange_port_data_sync - request information about local port
1337  * @adapter: pointer to struct zfcp_adapter
1338  * @data: pointer to struct fsf_qtcb_bottom_port
1339  * Returns: 0 on success, error otherwise
1340  */
1341 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1342                                      struct fsf_qtcb_bottom_port *data)
1343 {
1344         volatile struct qdio_buffer_element *sbale;
1345         struct zfcp_fsf_req *req = NULL;
1346         int retval = -EIO;
1347
1348         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1349                 return -EOPNOTSUPP;
1350
1351         spin_lock_bh(&adapter->req_q.lock);
1352         if (!zfcp_fsf_sbal_available(adapter))
1353                 goto out;
1354
1355         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1356                                   NULL);
1357         if (IS_ERR(req)) {
1358                 retval = PTR_ERR(req);
1359                 goto out;
1360         }
1361
1362         if (data)
1363                 req->data = data;
1364
1365         sbale = zfcp_qdio_sbale_req(req);
1366         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1367         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1368
1369         req->handler = zfcp_fsf_exchange_port_data_handler;
1370         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1371         retval = zfcp_fsf_req_send(req);
1372 out:
1373         spin_unlock_bh(&adapter->req_q.lock);
1374         if (!retval)
1375                 wait_event(req->completion_wq,
1376                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1377         zfcp_fsf_req_free(req);
1378
1379         return retval;
1380 }
1381
1382 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1383 {
1384         struct zfcp_port *port = req->data;
1385         struct fsf_qtcb_header *header = &req->qtcb->header;
1386         struct fsf_plogi *plogi;
1387
1388         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1389                 goto skip_fsfstatus;
1390
1391         switch (header->fsf_status) {
1392         case FSF_PORT_ALREADY_OPEN:
1393                 break;
1394         case FSF_ACCESS_DENIED:
1395                 zfcp_fsf_access_denied_port(req, port);
1396                 break;
1397         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1398                 dev_warn(&req->adapter->ccw_device->dev,
1399                          "Not enough FCP adapter resources to open "
1400                          "remote port 0x%016Lx\n", port->wwpn);
1401                 zfcp_erp_port_failed(port, 31, req);
1402                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1403                 break;
1404         case FSF_ADAPTER_STATUS_AVAILABLE:
1405                 switch (header->fsf_status_qual.word[0]) {
1406                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1407                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1408                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1409                         break;
1410                 case FSF_SQ_NO_RETRY_POSSIBLE:
1411                         dev_warn(&req->adapter->ccw_device->dev,
1412                                  "Remote port 0x%016Lx could not be opened\n",
1413                                  port->wwpn);
1414                         zfcp_erp_port_failed(port, 32, req);
1415                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1416                         break;
1417                 }
1418                 break;
1419         case FSF_GOOD:
1420                 port->handle = header->port_handle;
1421                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1422                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1423                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1424                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1425                                   &port->status);
1426                 /* check whether D_ID has changed during open */
1427                 /*
1428                  * FIXME: This check is not airtight, as the FCP channel does
1429                  * not monitor closures of target port connections caused on
1430                  * the remote side. Thus, they might miss out on invalidating
1431                  * locally cached WWPNs (and other N_Port parameters) of gone
1432                  * target ports. So, our heroic attempt to make things safe
1433                  * could be undermined by 'open port' response data tagged with
1434                  * obsolete WWPNs. Another reason to monitor potential
1435                  * connection closures ourself at least (by interpreting
1436                  * incoming ELS' and unsolicited status). It just crosses my
1437                  * mind that one should be able to cross-check by means of
1438                  * another GID_PN straight after a port has been opened.
1439                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1440                  */
1441                 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_NO_WWPN)
1442                         break;
1443
1444                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1445                 if (req->qtcb->bottom.support.els1_length >= sizeof(*plogi)) {
1446                         if (plogi->serv_param.wwpn != port->wwpn)
1447                                 atomic_clear_mask(ZFCP_STATUS_PORT_DID_DID,
1448                                                   &port->status);
1449                         else {
1450                                 port->wwnn = plogi->serv_param.wwnn;
1451                                 zfcp_fc_plogi_evaluate(port, plogi);
1452                         }
1453                 }
1454                 break;
1455         case FSF_UNKNOWN_OP_SUBTYPE:
1456                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1457                 break;
1458         }
1459
1460 skip_fsfstatus:
1461         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
1462 }
1463
1464 /**
1465  * zfcp_fsf_open_port - create and send open port request
1466  * @erp_action: pointer to struct zfcp_erp_action
1467  * Returns: 0 on success, error otherwise
1468  */
1469 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1470 {
1471         volatile struct qdio_buffer_element *sbale;
1472         struct zfcp_adapter *adapter = erp_action->adapter;
1473         struct zfcp_fsf_req *req;
1474         int retval = -EIO;
1475
1476         spin_lock_bh(&adapter->req_q.lock);
1477         if (zfcp_fsf_req_sbal_get(adapter))
1478                 goto out;
1479
1480         req = zfcp_fsf_req_create(adapter,
1481                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1482                                   ZFCP_REQ_AUTO_CLEANUP,
1483                                   adapter->pool.fsf_req_erp);
1484         if (IS_ERR(req)) {
1485                 retval = PTR_ERR(req);
1486                 goto out;
1487         }
1488
1489         sbale = zfcp_qdio_sbale_req(req);
1490         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1491         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1492
1493         req->handler = zfcp_fsf_open_port_handler;
1494         req->qtcb->bottom.support.d_id = erp_action->port->d_id;
1495         req->data = erp_action->port;
1496         req->erp_action = erp_action;
1497         erp_action->fsf_req = req;
1498         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
1499
1500         zfcp_fsf_start_erp_timer(req);
1501         retval = zfcp_fsf_req_send(req);
1502         if (retval) {
1503                 zfcp_fsf_req_free(req);
1504                 erp_action->fsf_req = NULL;
1505         }
1506 out:
1507         spin_unlock_bh(&adapter->req_q.lock);
1508         return retval;
1509 }
1510
1511 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1512 {
1513         struct zfcp_port *port = req->data;
1514
1515         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1516                 goto skip_fsfstatus;
1517
1518         switch (req->qtcb->header.fsf_status) {
1519         case FSF_PORT_HANDLE_NOT_VALID:
1520                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, req);
1521                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1522                 break;
1523         case FSF_ADAPTER_STATUS_AVAILABLE:
1524                 break;
1525         case FSF_GOOD:
1526                 zfcp_erp_modify_port_status(port, 33, req,
1527                                             ZFCP_STATUS_COMMON_OPEN,
1528                                             ZFCP_CLEAR);
1529                 break;
1530         }
1531
1532 skip_fsfstatus:
1533         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
1534 }
1535
1536 /**
1537  * zfcp_fsf_close_port - create and send close port request
1538  * @erp_action: pointer to struct zfcp_erp_action
1539  * Returns: 0 on success, error otherwise
1540  */
1541 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1542 {
1543         volatile struct qdio_buffer_element *sbale;
1544         struct zfcp_adapter *adapter = erp_action->adapter;
1545         struct zfcp_fsf_req *req;
1546         int retval = -EIO;
1547
1548         spin_lock_bh(&adapter->req_q.lock);
1549         if (zfcp_fsf_req_sbal_get(adapter))
1550                 goto out;
1551
1552         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1553                                   ZFCP_REQ_AUTO_CLEANUP,
1554                                   adapter->pool.fsf_req_erp);
1555         if (IS_ERR(req)) {
1556                 retval = PTR_ERR(req);
1557                 goto out;
1558         }
1559
1560         sbale = zfcp_qdio_sbale_req(req);
1561         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1562         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1563
1564         req->handler = zfcp_fsf_close_port_handler;
1565         req->data = erp_action->port;
1566         req->erp_action = erp_action;
1567         req->qtcb->header.port_handle = erp_action->port->handle;
1568         erp_action->fsf_req = req;
1569         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
1570
1571         zfcp_fsf_start_erp_timer(req);
1572         retval = zfcp_fsf_req_send(req);
1573         if (retval) {
1574                 zfcp_fsf_req_free(req);
1575                 erp_action->fsf_req = NULL;
1576         }
1577 out:
1578         spin_unlock_bh(&adapter->req_q.lock);
1579         return retval;
1580 }
1581
1582 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1583 {
1584         struct zfcp_port *port = req->data;
1585         struct fsf_qtcb_header *header = &req->qtcb->header;
1586         struct zfcp_unit *unit;
1587
1588         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1589                 goto skip_fsfstatus;
1590
1591         switch (header->fsf_status) {
1592         case FSF_PORT_HANDLE_NOT_VALID:
1593                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, req);
1594                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1595                 break;
1596         case FSF_ACCESS_DENIED:
1597                 zfcp_fsf_access_denied_port(req, port);
1598                 break;
1599         case FSF_PORT_BOXED:
1600                 zfcp_erp_port_boxed(port, 50, req);
1601                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1602                                ZFCP_STATUS_FSFREQ_RETRY;
1603                 /* can't use generic zfcp_erp_modify_port_status because
1604                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1605                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1606                 list_for_each_entry(unit, &port->unit_list_head, list)
1607                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1608                                           &unit->status);
1609                 break;
1610         case FSF_ADAPTER_STATUS_AVAILABLE:
1611                 switch (header->fsf_status_qual.word[0]) {
1612                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1613                         /* fall through */
1614                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1615                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1616                         break;
1617                 }
1618                 break;
1619         case FSF_GOOD:
1620                 /* can't use generic zfcp_erp_modify_port_status because
1621                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1622                  */
1623                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1624                 list_for_each_entry(unit, &port->unit_list_head, list)
1625                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1626                                           &unit->status);
1627                 break;
1628         }
1629 skip_fsfstatus:
1630         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
1631 }
1632
1633 /**
1634  * zfcp_fsf_close_physical_port - close physical port
1635  * @erp_action: pointer to struct zfcp_erp_action
1636  * Returns: 0 on success
1637  */
1638 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1639 {
1640         volatile struct qdio_buffer_element *sbale;
1641         struct zfcp_adapter *adapter = erp_action->adapter;
1642         struct zfcp_fsf_req *req;
1643         int retval = -EIO;
1644
1645         spin_lock_bh(&adapter->req_q.lock);
1646         if (zfcp_fsf_req_sbal_get(adapter))
1647                 goto out;
1648
1649         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1650                                   ZFCP_REQ_AUTO_CLEANUP,
1651                                   adapter->pool.fsf_req_erp);
1652         if (IS_ERR(req)) {
1653                 retval = PTR_ERR(req);
1654                 goto out;
1655         }
1656
1657         sbale = zfcp_qdio_sbale_req(req);
1658         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1659         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1660
1661         req->data = erp_action->port;
1662         req->qtcb->header.port_handle = erp_action->port->handle;
1663         req->erp_action = erp_action;
1664         req->handler = zfcp_fsf_close_physical_port_handler;
1665         erp_action->fsf_req = req;
1666         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
1667                         &erp_action->port->status);
1668
1669         zfcp_fsf_start_erp_timer(req);
1670         retval = zfcp_fsf_req_send(req);
1671         if (retval) {
1672                 zfcp_fsf_req_free(req);
1673                 erp_action->fsf_req = NULL;
1674         }
1675 out:
1676         spin_unlock_bh(&adapter->req_q.lock);
1677         return retval;
1678 }
1679
1680 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1681 {
1682         struct zfcp_adapter *adapter = req->adapter;
1683         struct zfcp_unit *unit = req->data;
1684         struct fsf_qtcb_header *header = &req->qtcb->header;
1685         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1686         struct fsf_queue_designator *queue_designator =
1687                                 &header->fsf_status_qual.fsf_queue_designator;
1688         int exclusive, readwrite;
1689
1690         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1691                 goto skip_fsfstatus;
1692
1693         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1694                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1695                           ZFCP_STATUS_UNIT_SHARED |
1696                           ZFCP_STATUS_UNIT_READONLY,
1697                           &unit->status);
1698
1699         switch (header->fsf_status) {
1700
1701         case FSF_PORT_HANDLE_NOT_VALID:
1702                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, req);
1703                 /* fall through */
1704         case FSF_LUN_ALREADY_OPEN:
1705                 break;
1706         case FSF_ACCESS_DENIED:
1707                 zfcp_fsf_access_denied_unit(req, unit);
1708                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1709                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1710                 break;
1711         case FSF_PORT_BOXED:
1712                 zfcp_erp_port_boxed(unit->port, 51, req);
1713                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1714                                ZFCP_STATUS_FSFREQ_RETRY;
1715                 break;
1716         case FSF_LUN_SHARING_VIOLATION:
1717                 if (header->fsf_status_qual.word[0])
1718                         dev_warn(&adapter->ccw_device->dev,
1719                                  "LUN 0x%Lx on port 0x%Lx is already in "
1720                                  "use by CSS%d, MIF Image ID %x\n",
1721                                  unit->fcp_lun,
1722                                  unit->port->wwpn,
1723                                  queue_designator->cssid,
1724                                  queue_designator->hla);
1725                 else
1726                         zfcp_act_eval_err(adapter,
1727                                           header->fsf_status_qual.word[2]);
1728                 zfcp_erp_unit_access_denied(unit, 60, req);
1729                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1730                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1731                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1732                 break;
1733         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1734                 dev_warn(&adapter->ccw_device->dev,
1735                          "No handle is available for LUN "
1736                          "0x%016Lx on port 0x%016Lx\n",
1737                          unit->fcp_lun, unit->port->wwpn);
1738                 zfcp_erp_unit_failed(unit, 34, req);
1739                 /* fall through */
1740         case FSF_INVALID_COMMAND_OPTION:
1741                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1742                 break;
1743         case FSF_ADAPTER_STATUS_AVAILABLE:
1744                 switch (header->fsf_status_qual.word[0]) {
1745                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1746                         zfcp_test_link(unit->port);
1747                         /* fall through */
1748                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1749                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1750                         break;
1751                 }
1752                 break;
1753
1754         case FSF_GOOD:
1755                 unit->handle = header->lun_handle;
1756                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1757
1758                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1759                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1760                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1761                         exclusive = (bottom->lun_access_info &
1762                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1763                         readwrite = (bottom->lun_access_info &
1764                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1765
1766                         if (!exclusive)
1767                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1768                                                 &unit->status);
1769
1770                         if (!readwrite) {
1771                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1772                                                 &unit->status);
1773                                 dev_info(&adapter->ccw_device->dev,
1774                                          "SCSI device at LUN 0x%016Lx on port "
1775                                          "0x%016Lx opened read-only\n",
1776                                          unit->fcp_lun, unit->port->wwpn);
1777                         }
1778
1779                         if (exclusive && !readwrite) {
1780                                 dev_err(&adapter->ccw_device->dev,
1781                                         "Exclusive read-only access not "
1782                                         "supported (unit 0x%016Lx, "
1783                                         "port 0x%016Lx)\n",
1784                                         unit->fcp_lun, unit->port->wwpn);
1785                                 zfcp_erp_unit_failed(unit, 35, req);
1786                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1787                                 zfcp_erp_unit_shutdown(unit, 0, 80, req);
1788                         } else if (!exclusive && readwrite) {
1789                                 dev_err(&adapter->ccw_device->dev,
1790                                         "Shared read-write access not "
1791                                         "supported (unit 0x%016Lx, port "
1792                                         "0x%016Lx\n)",
1793                                         unit->fcp_lun, unit->port->wwpn);
1794                                 zfcp_erp_unit_failed(unit, 36, req);
1795                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1796                                 zfcp_erp_unit_shutdown(unit, 0, 81, req);
1797                         }
1798                 }
1799                 break;
1800         }
1801
1802 skip_fsfstatus:
1803         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
1804 }
1805
1806 /**
1807  * zfcp_fsf_open_unit - open unit
1808  * @erp_action: pointer to struct zfcp_erp_action
1809  * Returns: 0 on success, error otherwise
1810  */
1811 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1812 {
1813         volatile struct qdio_buffer_element *sbale;
1814         struct zfcp_adapter *adapter = erp_action->adapter;
1815         struct zfcp_fsf_req *req;
1816         int retval = -EIO;
1817
1818         spin_lock_bh(&adapter->req_q.lock);
1819         if (zfcp_fsf_req_sbal_get(adapter))
1820                 goto out;
1821
1822         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1823                                   ZFCP_REQ_AUTO_CLEANUP,
1824                                   adapter->pool.fsf_req_erp);
1825         if (IS_ERR(req)) {
1826                 retval = PTR_ERR(req);
1827                 goto out;
1828         }
1829
1830         sbale = zfcp_qdio_sbale_req(req);
1831         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1832         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1833
1834         req->qtcb->header.port_handle = erp_action->port->handle;
1835         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1836         req->handler = zfcp_fsf_open_unit_handler;
1837         req->data = erp_action->unit;
1838         req->erp_action = erp_action;
1839         erp_action->fsf_req = req;
1840
1841         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1842                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1843
1844         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
1845
1846         zfcp_fsf_start_erp_timer(req);
1847         retval = zfcp_fsf_req_send(req);
1848         if (retval) {
1849                 zfcp_fsf_req_free(req);
1850                 erp_action->fsf_req = NULL;
1851         }
1852 out:
1853         spin_unlock_bh(&adapter->req_q.lock);
1854         return retval;
1855 }
1856
1857 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1858 {
1859         struct zfcp_unit *unit = req->data;
1860
1861         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1862                 goto skip_fsfstatus;
1863
1864         switch (req->qtcb->header.fsf_status) {
1865         case FSF_PORT_HANDLE_NOT_VALID:
1866                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, req);
1867                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1868                 break;
1869         case FSF_LUN_HANDLE_NOT_VALID:
1870                 zfcp_erp_port_reopen(unit->port, 0, 111, req);
1871                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1872                 break;
1873         case FSF_PORT_BOXED:
1874                 zfcp_erp_port_boxed(unit->port, 52, req);
1875                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1876                                ZFCP_STATUS_FSFREQ_RETRY;
1877                 break;
1878         case FSF_ADAPTER_STATUS_AVAILABLE:
1879                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
1880                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1881                         zfcp_test_link(unit->port);
1882                         /* fall through */
1883                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1884                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1885                         break;
1886                 }
1887                 break;
1888         case FSF_GOOD:
1889                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1890                 break;
1891         }
1892 skip_fsfstatus:
1893         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
1894 }
1895
1896 /**
1897  * zfcp_fsf_close_unit - close zfcp unit
1898  * @erp_action: pointer to struct zfcp_unit
1899  * Returns: 0 on success, error otherwise
1900  */
1901 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
1902 {
1903         volatile struct qdio_buffer_element *sbale;
1904         struct zfcp_adapter *adapter = erp_action->adapter;
1905         struct zfcp_fsf_req *req;
1906         int retval = -EIO;
1907
1908         spin_lock_bh(&adapter->req_q.lock);
1909         if (zfcp_fsf_req_sbal_get(adapter))
1910                 goto out;
1911         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
1912                                   ZFCP_REQ_AUTO_CLEANUP,
1913                                   adapter->pool.fsf_req_erp);
1914         if (IS_ERR(req)) {
1915                 retval = PTR_ERR(req);
1916                 goto out;
1917         }
1918
1919         sbale = zfcp_qdio_sbale_req(req);
1920         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1921         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1922
1923         req->qtcb->header.port_handle = erp_action->port->handle;
1924         req->qtcb->header.lun_handle = erp_action->unit->handle;
1925         req->handler = zfcp_fsf_close_unit_handler;
1926         req->data = erp_action->unit;
1927         req->erp_action = erp_action;
1928         erp_action->fsf_req = req;
1929         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
1930
1931         zfcp_fsf_start_erp_timer(req);
1932         retval = zfcp_fsf_req_send(req);
1933         if (retval) {
1934                 zfcp_fsf_req_free(req);
1935                 erp_action->fsf_req = NULL;
1936         }
1937 out:
1938         spin_unlock_bh(&adapter->req_q.lock);
1939         return retval;
1940 }
1941
1942 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
1943 {
1944         lat_rec->sum += lat;
1945         lat_rec->min = min(lat_rec->min, lat);
1946         lat_rec->max = max(lat_rec->max, lat);
1947 }
1948
1949 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
1950 {
1951         struct fsf_qual_latency_info *lat_inf;
1952         struct latency_cont *lat;
1953         struct zfcp_unit *unit = req->unit;
1954         unsigned long flags;
1955
1956         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
1957
1958         switch (req->qtcb->bottom.io.data_direction) {
1959         case FSF_DATADIR_READ:
1960                 lat = &unit->latencies.read;
1961                 break;
1962         case FSF_DATADIR_WRITE:
1963                 lat = &unit->latencies.write;
1964                 break;
1965         case FSF_DATADIR_CMND:
1966                 lat = &unit->latencies.cmd;
1967                 break;
1968         default:
1969                 return;
1970         }
1971
1972         spin_lock_irqsave(&unit->latencies.lock, flags);
1973         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
1974         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
1975         lat->counter++;
1976         spin_unlock_irqrestore(&unit->latencies.lock, flags);
1977 }
1978
1979 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
1980 {
1981         struct scsi_cmnd *scpnt = req->data;
1982         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
1983             &(req->qtcb->bottom.io.fcp_rsp);
1984         u32 sns_len;
1985         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
1986         unsigned long flags;
1987
1988         if (unlikely(!scpnt))
1989                 return;
1990
1991         read_lock_irqsave(&req->adapter->abort_lock, flags);
1992
1993         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
1994                 set_host_byte(scpnt, DID_SOFT_ERROR);
1995                 set_driver_byte(scpnt, SUGGEST_RETRY);
1996                 goto skip_fsfstatus;
1997         }
1998
1999         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2000                 set_host_byte(scpnt, DID_ERROR);
2001                 goto skip_fsfstatus;
2002         }
2003
2004         set_msg_byte(scpnt, COMMAND_COMPLETE);
2005
2006         scpnt->result |= fcp_rsp_iu->scsi_status;
2007
2008         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2009                 zfcp_fsf_req_latency(req);
2010
2011         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2012                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2013                         set_host_byte(scpnt, DID_OK);
2014                 else {
2015                         set_host_byte(scpnt, DID_ERROR);
2016                         goto skip_fsfstatus;
2017                 }
2018         }
2019
2020         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2021                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2022                           fcp_rsp_iu->fcp_rsp_len;
2023                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2024                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2025
2026                 memcpy(scpnt->sense_buffer,
2027                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2028         }
2029
2030         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2031                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2032                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2033                     scpnt->underflow)
2034                         set_host_byte(scpnt, DID_ERROR);
2035         }
2036 skip_fsfstatus:
2037         if (scpnt->result != 0)
2038                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2039         else if (scpnt->retries > 0)
2040                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2041         else
2042                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2043
2044         scpnt->host_scribble = NULL;
2045         (scpnt->scsi_done) (scpnt);
2046         /*
2047          * We must hold this lock until scsi_done has been called.
2048          * Otherwise we may call scsi_done after abort regarding this
2049          * command has completed.
2050          * Note: scsi_done must not block!
2051          */
2052         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2053 }
2054
2055 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2056 {
2057         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2058             &(req->qtcb->bottom.io.fcp_rsp);
2059         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2060
2061         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2062              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2063                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2064 }
2065
2066
2067 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2068 {
2069         struct zfcp_unit *unit;
2070         struct fsf_qtcb_header *header = &req->qtcb->header;
2071
2072         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2073                 unit = req->data;
2074         else
2075                 unit = req->unit;
2076
2077         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2078                 goto skip_fsfstatus;
2079
2080         switch (header->fsf_status) {
2081         case FSF_HANDLE_MISMATCH:
2082         case FSF_PORT_HANDLE_NOT_VALID:
2083                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, req);
2084                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2085                 break;
2086         case FSF_FCPLUN_NOT_VALID:
2087         case FSF_LUN_HANDLE_NOT_VALID:
2088                 zfcp_erp_port_reopen(unit->port, 0, 113, req);
2089                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2090                 break;
2091         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2092                 zfcp_fsf_class_not_supp(req);
2093                 break;
2094         case FSF_ACCESS_DENIED:
2095                 zfcp_fsf_access_denied_unit(req, unit);
2096                 break;
2097         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2098                 dev_err(&req->adapter->ccw_device->dev,
2099                         "Incorrect direction %d, unit 0x%016Lx on port "
2100                         "0x%016Lx closed\n",
2101                         req->qtcb->bottom.io.data_direction,
2102                         unit->fcp_lun, unit->port->wwpn);
2103                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, req);
2104                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2105                 break;
2106         case FSF_CMND_LENGTH_NOT_VALID:
2107                 dev_err(&req->adapter->ccw_device->dev,
2108                         "Incorrect CDB length %d, unit 0x%016Lx on "
2109                         "port 0x%016Lx closed\n",
2110                         req->qtcb->bottom.io.fcp_cmnd_length,
2111                         unit->fcp_lun, unit->port->wwpn);
2112                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, req);
2113                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2114                 break;
2115         case FSF_PORT_BOXED:
2116                 zfcp_erp_port_boxed(unit->port, 53, req);
2117                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2118                                ZFCP_STATUS_FSFREQ_RETRY;
2119                 break;
2120         case FSF_LUN_BOXED:
2121                 zfcp_erp_unit_boxed(unit, 54, req);
2122                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2123                                ZFCP_STATUS_FSFREQ_RETRY;
2124                 break;
2125         case FSF_ADAPTER_STATUS_AVAILABLE:
2126                 if (header->fsf_status_qual.word[0] ==
2127                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2128                         zfcp_test_link(unit->port);
2129                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2130                 break;
2131         }
2132 skip_fsfstatus:
2133         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2134                 zfcp_fsf_send_fcp_ctm_handler(req);
2135         else {
2136                 zfcp_fsf_send_fcp_command_task_handler(req);
2137                 req->unit = NULL;
2138                 zfcp_unit_put(unit);
2139         }
2140 }
2141
2142 /**
2143  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2144  * @adapter: adapter where scsi command is issued
2145  * @unit: unit where command is sent to
2146  * @scsi_cmnd: scsi command to be sent
2147  * @timer: timer to be started when request is initiated
2148  * @req_flags: flags for fsf_request
2149  */
2150 int zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
2151                                    struct zfcp_unit *unit,
2152                                    struct scsi_cmnd *scsi_cmnd,
2153                                    int use_timer, int req_flags)
2154 {
2155         struct zfcp_fsf_req *req;
2156         struct fcp_cmnd_iu *fcp_cmnd_iu;
2157         unsigned int sbtype;
2158         int real_bytes, retval = -EIO;
2159
2160         if (unlikely(!(atomic_read(&unit->status) &
2161                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2162                 return -EBUSY;
2163
2164         spin_lock(&adapter->req_q.lock);
2165         if (!zfcp_fsf_sbal_available(adapter))
2166                 goto out;
2167         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2168                                   adapter->pool.fsf_req_scsi);
2169         if (IS_ERR(req)) {
2170                 retval = PTR_ERR(req);
2171                 goto out;
2172         }
2173
2174         zfcp_unit_get(unit);
2175         req->unit = unit;
2176         req->data = scsi_cmnd;
2177         req->handler = zfcp_fsf_send_fcp_command_handler;
2178         req->qtcb->header.lun_handle = unit->handle;
2179         req->qtcb->header.port_handle = unit->port->handle;
2180         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2181
2182         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2183
2184         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2185         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2186         /*
2187          * set depending on data direction:
2188          *      data direction bits in SBALE (SB Type)
2189          *      data direction bits in QTCB
2190          *      data direction bits in FCP_CMND IU
2191          */
2192         switch (scsi_cmnd->sc_data_direction) {
2193         case DMA_NONE:
2194                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2195                 sbtype = SBAL_FLAGS0_TYPE_READ;
2196                 break;
2197         case DMA_FROM_DEVICE:
2198                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2199                 sbtype = SBAL_FLAGS0_TYPE_READ;
2200                 fcp_cmnd_iu->rddata = 1;
2201                 break;
2202         case DMA_TO_DEVICE:
2203                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2204                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2205                 fcp_cmnd_iu->wddata = 1;
2206                 break;
2207         case DMA_BIDIRECTIONAL:
2208         default:
2209                 retval = -EIO;
2210                 goto failed_scsi_cmnd;
2211         }
2212
2213         if (likely((scsi_cmnd->device->simple_tags) ||
2214                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2215                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2216                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2217         else
2218                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2219
2220         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2221                 fcp_cmnd_iu->add_fcp_cdb_length =
2222                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2223
2224         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2225
2226         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2227                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(fcp_dl_t);
2228
2229         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2230                                              scsi_sglist(scsi_cmnd),
2231                                              FSF_MAX_SBALS_PER_REQ);
2232         if (unlikely(real_bytes < 0)) {
2233                 if (req->sbal_number < FSF_MAX_SBALS_PER_REQ)
2234                         retval = -EIO;
2235                 else {
2236                         dev_err(&adapter->ccw_device->dev,
2237                                 "Oversize data package, unit 0x%016Lx "
2238                                 "on port 0x%016Lx closed\n",
2239                                 unit->fcp_lun, unit->port->wwpn);
2240                         zfcp_erp_unit_shutdown(unit, 0, 131, req);
2241                         retval = -EINVAL;
2242                 }
2243                 goto failed_scsi_cmnd;
2244         }
2245
2246         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2247
2248         if (use_timer)
2249                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2250
2251         retval = zfcp_fsf_req_send(req);
2252         if (unlikely(retval))
2253                 goto failed_scsi_cmnd;
2254
2255         goto out;
2256
2257 failed_scsi_cmnd:
2258         zfcp_unit_put(unit);
2259         zfcp_fsf_req_free(req);
2260         scsi_cmnd->host_scribble = NULL;
2261 out:
2262         spin_unlock(&adapter->req_q.lock);
2263         return retval;
2264 }
2265
2266 /**
2267  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2268  * @adapter: pointer to struct zfcp-adapter
2269  * @unit: pointer to struct zfcp_unit
2270  * @tm_flags: unsigned byte for task management flags
2271  * @req_flags: int request flags
2272  * Returns: on success pointer to struct fsf_req, NULL otherwise
2273  */
2274 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_adapter *adapter,
2275                                            struct zfcp_unit *unit,
2276                                            u8 tm_flags, int req_flags)
2277 {
2278         volatile struct qdio_buffer_element *sbale;
2279         struct zfcp_fsf_req *req = NULL;
2280         struct fcp_cmnd_iu *fcp_cmnd_iu;
2281
2282         if (unlikely(!(atomic_read(&unit->status) &
2283                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2284                 return NULL;
2285
2286         spin_lock(&adapter->req_q.lock);
2287         if (!zfcp_fsf_sbal_available(adapter))
2288                 goto out;
2289         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2290                                   adapter->pool.fsf_req_scsi);
2291         if (IS_ERR(req))
2292                 goto out;
2293
2294         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2295         req->data = unit;
2296         req->handler = zfcp_fsf_send_fcp_command_handler;
2297         req->qtcb->header.lun_handle = unit->handle;
2298         req->qtcb->header.port_handle = unit->port->handle;
2299         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2300         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2301         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2302                                                 sizeof(fcp_dl_t);
2303
2304         sbale = zfcp_qdio_sbale_req(req);
2305         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2306         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2307
2308         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2309         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2310         fcp_cmnd_iu->task_management_flags = tm_flags;
2311
2312         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2313         if (!zfcp_fsf_req_send(req))
2314                 goto out;
2315
2316         zfcp_fsf_req_free(req);
2317         req = NULL;
2318 out:
2319         spin_unlock(&adapter->req_q.lock);
2320         return req;
2321 }
2322
2323 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2324 {
2325         if (req->qtcb->header.fsf_status != FSF_GOOD)
2326                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2327 }
2328
2329 /**
2330  * zfcp_fsf_control_file - control file upload/download
2331  * @adapter: pointer to struct zfcp_adapter
2332  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2333  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2334  */
2335 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2336                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2337 {
2338         volatile struct qdio_buffer_element *sbale;
2339         struct zfcp_fsf_req *req = NULL;
2340         struct fsf_qtcb_bottom_support *bottom;
2341         int direction, retval = -EIO, bytes;
2342
2343         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2344                 return ERR_PTR(-EOPNOTSUPP);
2345
2346         switch (fsf_cfdc->command) {
2347         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2348                 direction = SBAL_FLAGS0_TYPE_WRITE;
2349                 break;
2350         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2351                 direction = SBAL_FLAGS0_TYPE_READ;
2352                 break;
2353         default:
2354                 return ERR_PTR(-EINVAL);
2355         }
2356
2357         spin_lock_bh(&adapter->req_q.lock);
2358         if (zfcp_fsf_req_sbal_get(adapter))
2359                 goto out;
2360
2361         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2362         if (IS_ERR(req)) {
2363                 retval = -EPERM;
2364                 goto out;
2365         }
2366
2367         req->handler = zfcp_fsf_control_file_handler;
2368
2369         sbale = zfcp_qdio_sbale_req(req);
2370         sbale[0].flags |= direction;
2371
2372         bottom = &req->qtcb->bottom.support;
2373         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2374         bottom->option = fsf_cfdc->option;
2375
2376         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2377                                         FSF_MAX_SBALS_PER_REQ);
2378         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2379                 retval = -ENOMEM;
2380                 zfcp_fsf_req_free(req);
2381                 goto out;
2382         }
2383
2384         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2385         retval = zfcp_fsf_req_send(req);
2386 out:
2387         spin_unlock_bh(&adapter->req_q.lock);
2388
2389         if (!retval) {
2390                 wait_event(req->completion_wq,
2391                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2392                 return req;
2393         }
2394         return ERR_PTR(retval);
2395 }