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 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/blktrace_api.h>
  13 #include "zfcp_ext.h"
  14
  15 #define ZFCP_REQ_AUTO_CLEANUP   0x00000002
  16 #define ZFCP_REQ_NO_QTCB        0x00000008
  17
  18 static void zfcp_fsf_request_timeout_handler(unsigned long data)
  19 {
  20         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
  21         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 62,
  22                                 NULL);
  23 }
  24
  25 static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
  26                                  unsigned long timeout)
  27 {
  28         fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
  29         fsf_req->timer.data = (unsigned long) fsf_req->adapter;
  30         fsf_req->timer.expires = jiffies + timeout;
  31         add_timer(&fsf_req->timer);
  32 }
  33
  34 static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
  35 {
  36         BUG_ON(!fsf_req->erp_action);
  37         fsf_req->timer.function = zfcp_erp_timeout_handler;
  38         fsf_req->timer.data = (unsigned long) fsf_req->erp_action;
  39         fsf_req->timer.expires = jiffies + 30 * HZ;
  40         add_timer(&fsf_req->timer);
  41 }
  42
  43 /* association between FSF command and FSF QTCB type */
  44 static u32 fsf_qtcb_type[] = {
  45         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  46         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  47         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  48         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  49         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  50         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  51         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  52         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  53         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  54         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  55         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  56         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  57         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  58 };
  59
  60 static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
  61 {
  62         u16 subtable = table >> 16;
  63         u16 rule = table & 0xffff;
  64         const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };
  65
  66         if (subtable && subtable < ARRAY_SIZE(act_type))
  67                 dev_warn(&adapter->ccw_device->dev,
  68                          "Access denied according to ACT rule type %s, "
  69                          "rule %d\n", act_type[subtable], rule);
  70 }
  71
  72 static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
  73                                         struct zfcp_port *port)
  74 {
  75         struct fsf_qtcb_header *header = &req->qtcb->header;
  76         dev_warn(&req->adapter->ccw_device->dev,
  77                  "Access denied to port 0x%016Lx\n",
  78                  (unsigned long long)port->wwpn);
  79         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  80         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  81         zfcp_erp_port_access_denied(port, 55, req);
  82         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  83 }
  84
  85 static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
  86                                         struct zfcp_unit *unit)
  87 {
  88         struct fsf_qtcb_header *header = &req->qtcb->header;
  89         dev_warn(&req->adapter->ccw_device->dev,
  90                  "Access denied to unit 0x%016Lx on port 0x%016Lx\n",
  91                  (unsigned long long)unit->fcp_lun,
  92                  (unsigned long long)unit->port->wwpn);
  93         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  94         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  95         zfcp_erp_unit_access_denied(unit, 59, req);
  96         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  97 }
  98
  99 static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
 100 {
 101         dev_err(&req->adapter->ccw_device->dev, "FCP device not "
 102                 "operational because of an unsupported FC class\n");
 103         zfcp_erp_adapter_shutdown(req->adapter, 0, 123, req);
 104         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 105 }
 106
 107 /**
 108  * zfcp_fsf_req_free - free memory used by fsf request
 109  * @fsf_req: pointer to struct zfcp_fsf_req
 110  */
 111 void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
 112 {
 113         if (likely(req->pool)) {
 114                 mempool_free(req, req->pool);
 115                 return;
 116         }
 117
 118         if (req->qtcb) {
 119                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, req);
 120                 return;
 121         }
 122 }
 123
 124 /**
 125  * zfcp_fsf_req_dismiss_all - dismiss all fsf requests
 126  * @adapter: pointer to struct zfcp_adapter
 127  *
 128  * Never ever call this without shutting down the adapter first.
 129  * Otherwise the adapter would continue using and corrupting s390 storage.
 130  * Included BUG_ON() call to ensure this is done.
 131  * ERP is supposed to be the only user of this function.
 132  */
 133 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 134 {
 135         struct zfcp_fsf_req *req, *tmp;
 136         unsigned long flags;
 137         LIST_HEAD(remove_queue);
 138         unsigned int i;
 139
 140         BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
 141         spin_lock_irqsave(&adapter->req_list_lock, flags);
 142         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 143                 list_splice_init(&adapter->req_list[i], &remove_queue);
 144         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 145
 146         list_for_each_entry_safe(req, tmp, &remove_queue, list) {
 147                 list_del(&req->list);
 148                 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 149                 zfcp_fsf_req_complete(req);
 150         }
 151 }
 152
 153 static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
 154 {
 155         struct fsf_status_read_buffer *sr_buf = req->data;
 156         struct zfcp_adapter *adapter = req->adapter;
 157         struct zfcp_port *port;
 158         int d_id = sr_buf->d_id & ZFCP_DID_MASK;
 159         unsigned long flags;
 160
 161         read_lock_irqsave(&zfcp_data.config_lock, flags);
 162         list_for_each_entry(port, &adapter->port_list_head, list)
 163                 if (port->d_id == d_id) {
 164                         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 165                         switch (sr_buf->status_subtype) {
 166                         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 167                                 zfcp_erp_port_reopen(port, 0, 101, req);
 168                                 break;
 169                         case FSF_STATUS_READ_SUB_ERROR_PORT:
 170                                 zfcp_erp_port_shutdown(port, 0, 122, req);
 171                                 break;
 172                         }
 173                         return;
 174                 }
 175         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 176 }
 177
 178 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, u8 id,
 179                                          struct fsf_link_down_info *link_down)
 180 {
 181         struct zfcp_adapter *adapter = req->adapter;
 182
 183         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 184                 return;
 185
 186         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 187
 188         if (!link_down)
 189                 goto out;
 190
 191         switch (link_down->error_code) {
 192         case FSF_PSQ_LINK_NO_LIGHT:
 193                 dev_warn(&req->adapter->ccw_device->dev,
 194                          "There is no light signal from the local "
 195                          "fibre channel cable\n");
 196                 break;
 197         case FSF_PSQ_LINK_WRAP_PLUG:
 198                 dev_warn(&req->adapter->ccw_device->dev,
 199                          "There is a wrap plug instead of a fibre "
 200                          "channel cable\n");
 201                 break;
 202         case FSF_PSQ_LINK_NO_FCP:
 203                 dev_warn(&req->adapter->ccw_device->dev,
 204                          "The adjacent fibre channel node does not "
 205                          "support FCP\n");
 206                 break;
 207         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 208                 dev_warn(&req->adapter->ccw_device->dev,
 209                          "The FCP device is suspended because of a "
 210                          "firmware update\n");
 211                 break;
 212         case FSF_PSQ_LINK_INVALID_WWPN:
 213                 dev_warn(&req->adapter->ccw_device->dev,
 214                          "The FCP device detected a WWPN that is "
 215                          "duplicate or not valid\n");
 216                 break;
 217         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 218                 dev_warn(&req->adapter->ccw_device->dev,
 219                          "The fibre channel fabric does not support NPIV\n");
 220                 break;
 221         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 222                 dev_warn(&req->adapter->ccw_device->dev,
 223                          "The FCP adapter cannot support more NPIV ports\n");
 224                 break;
 225         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 226                 dev_warn(&req->adapter->ccw_device->dev,
 227                          "The adjacent switch cannot support "
 228                          "more NPIV ports\n");
 229                 break;
 230         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 231                 dev_warn(&req->adapter->ccw_device->dev,
 232                          "The FCP adapter could not log in to the "
 233                          "fibre channel fabric\n");
 234                 break;
 235         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 236                 dev_warn(&req->adapter->ccw_device->dev,
 237                          "The WWPN assignment file on the FCP adapter "
 238                          "has been damaged\n");
 239                 break;
 240         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 241                 dev_warn(&req->adapter->ccw_device->dev,
 242                          "The mode table on the FCP adapter "
 243                          "has been damaged\n");
 244                 break;
 245         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 246                 dev_warn(&req->adapter->ccw_device->dev,
 247                          "All NPIV ports on the FCP adapter have "
 248                          "been assigned\n");
 249                 break;
 250         default:
 251                 dev_warn(&req->adapter->ccw_device->dev,
 252                          "The link between the FCP adapter and "
 253                          "the FC fabric is down\n");
 254         }
 255 out:
 256         zfcp_erp_adapter_failed(adapter, id, req);
 257 }
 258
 259 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 260 {
 261         struct fsf_status_read_buffer *sr_buf = req->data;
 262         struct fsf_link_down_info *ldi =
 263                 (struct fsf_link_down_info *) &sr_buf->payload;
 264
 265         switch (sr_buf->status_subtype) {
 266         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 267                 zfcp_fsf_link_down_info_eval(req, 38, ldi);
 268                 break;
 269         case FSF_STATUS_READ_SUB_FDISC_FAILED:
 270                 zfcp_fsf_link_down_info_eval(req, 39, ldi);
 271                 break;
 272         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 273                 zfcp_fsf_link_down_info_eval(req, 40, NULL);
 274         };
 275 }
 276
 277 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 278 {
 279         struct zfcp_adapter *adapter = req->adapter;
 280         struct fsf_status_read_buffer *sr_buf = req->data;
 281
 282         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 283                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, sr_buf);
 284                 mempool_free(sr_buf, adapter->pool.data_status_read);
 285                 zfcp_fsf_req_free(req);
 286                 return;
 287         }
 288
 289         zfcp_hba_dbf_event_fsf_unsol("read", adapter, sr_buf);
 290
 291         switch (sr_buf->status_type) {
 292         case FSF_STATUS_READ_PORT_CLOSED:
 293                 zfcp_fsf_status_read_port_closed(req);
 294                 break;
 295         case FSF_STATUS_READ_INCOMING_ELS:
 296                 zfcp_fc_incoming_els(req);
 297                 break;
 298         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 299                 break;
 300         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 301                 dev_warn(&adapter->ccw_device->dev,
 302                          "The error threshold for checksum statistics "
 303                          "has been exceeded\n");
 304                 zfcp_hba_dbf_event_berr(adapter, req);
 305                 break;
 306         case FSF_STATUS_READ_LINK_DOWN:
 307                 zfcp_fsf_status_read_link_down(req);
 308                 break;
 309         case FSF_STATUS_READ_LINK_UP:
 310                 dev_info(&adapter->ccw_device->dev,
 311                          "The local link has been restored\n");
 312                 /* All ports should be marked as ready to run again */
 313                 zfcp_erp_modify_adapter_status(adapter, 30, NULL,
 314                                                ZFCP_STATUS_COMMON_RUNNING,
 315                                                ZFCP_SET);
 316                 zfcp_erp_adapter_reopen(adapter,
 317                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 318                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 319                                         102, req);
 320                 break;
 321         case FSF_STATUS_READ_NOTIFICATION_LOST:
 322                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
 323                         zfcp_erp_adapter_access_changed(adapter, 135, req);
 324                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
 325                         schedule_work(&adapter->scan_work);
 326                 break;
 327         case FSF_STATUS_READ_CFDC_UPDATED:
 328                 zfcp_erp_adapter_access_changed(adapter, 136, req);
 329                 break;
 330         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 331                 adapter->adapter_features = sr_buf->payload.word[0];
 332                 break;
 333         }
 334
 335         mempool_free(sr_buf, adapter->pool.data_status_read);
 336         zfcp_fsf_req_free(req);
 337
 338         atomic_inc(&adapter->stat_miss);
 339         queue_work(zfcp_data.work_queue, &adapter->stat_work);
 340 }
 341
 342 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 343 {
 344         switch (req->qtcb->header.fsf_status_qual.word[0]) {
 345         case FSF_SQ_FCP_RSP_AVAILABLE:
 346         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 347         case FSF_SQ_NO_RETRY_POSSIBLE:
 348         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 349                 return;
 350         case FSF_SQ_COMMAND_ABORTED:
 351                 req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 352                 break;
 353         case FSF_SQ_NO_RECOM:
 354                 dev_err(&req->adapter->ccw_device->dev,
 355                         "The FCP adapter reported a problem "
 356                         "that cannot be recovered\n");
 357                 zfcp_erp_adapter_shutdown(req->adapter, 0, 121, req);
 358                 break;
 359         }
 360         /* all non-return stats set FSFREQ_ERROR*/
 361         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 362 }
 363
 364 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 365 {
 366         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 367                 return;
 368
 369         switch (req->qtcb->header.fsf_status) {
 370         case FSF_UNKNOWN_COMMAND:
 371                 dev_err(&req->adapter->ccw_device->dev,
 372                         "The FCP adapter does not recognize the command 0x%x\n",
 373                         req->qtcb->header.fsf_command);
 374                 zfcp_erp_adapter_shutdown(req->adapter, 0, 120, req);
 375                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 376                 break;
 377         case FSF_ADAPTER_STATUS_AVAILABLE:
 378                 zfcp_fsf_fsfstatus_qual_eval(req);
 379                 break;
 380         }
 381 }
 382
 383 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 384 {
 385         struct zfcp_adapter *adapter = req->adapter;
 386         struct fsf_qtcb *qtcb = req->qtcb;
 387         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 388
 389         zfcp_hba_dbf_event_fsf_response(req);
 390
 391         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 392                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 393                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 394                 return;
 395         }
 396
 397         switch (qtcb->prefix.prot_status) {
 398         case FSF_PROT_GOOD:
 399         case FSF_PROT_FSF_STATUS_PRESENTED:
 400                 return;
 401         case FSF_PROT_QTCB_VERSION_ERROR:
 402                 dev_err(&adapter->ccw_device->dev,
 403                         "QTCB version 0x%x not supported by FCP adapter "
 404                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
 405                         psq->word[0], psq->word[1]);
 406                 zfcp_erp_adapter_shutdown(adapter, 0, 117, req);
 407                 break;
 408         case FSF_PROT_ERROR_STATE:
 409         case FSF_PROT_SEQ_NUMB_ERROR:
 410                 zfcp_erp_adapter_reopen(adapter, 0, 98, req);
 411                 req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 412                 break;
 413         case FSF_PROT_UNSUPP_QTCB_TYPE:
 414                 dev_err(&adapter->ccw_device->dev,
 415                         "The QTCB type is not supported by the FCP adapter\n");
 416                 zfcp_erp_adapter_shutdown(adapter, 0, 118, req);
 417                 break;
 418         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 419                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 420                                 &adapter->status);
 421                 break;
 422         case FSF_PROT_DUPLICATE_REQUEST_ID:
 423                 dev_err(&adapter->ccw_device->dev,
 424                         "0x%Lx is an ambiguous request identifier\n",
 425                         (unsigned long long)qtcb->bottom.support.req_handle);
 426                 zfcp_erp_adapter_shutdown(adapter, 0, 78, req);
 427                 break;
 428         case FSF_PROT_LINK_DOWN:
 429                 zfcp_fsf_link_down_info_eval(req, 37, &psq->link_down_info);
 430                 /* FIXME: reopening adapter now? better wait for link up */
 431                 zfcp_erp_adapter_reopen(adapter, 0, 79, req);
 432                 break;
 433         case FSF_PROT_REEST_QUEUE:
 434                 /* All ports should be marked as ready to run again */
 435                 zfcp_erp_modify_adapter_status(adapter, 28, NULL,
 436                                                ZFCP_STATUS_COMMON_RUNNING,
 437                                                ZFCP_SET);
 438                 zfcp_erp_adapter_reopen(adapter,
 439                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 440                                         ZFCP_STATUS_COMMON_ERP_FAILED, 99, req);
 441                 break;
 442         default:
 443                 dev_err(&adapter->ccw_device->dev,
 444                         "0x%x is not a valid transfer protocol status\n",
 445                         qtcb->prefix.prot_status);
 446                 zfcp_erp_adapter_shutdown(adapter, 0, 119, req);
 447         }
 448         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 449 }
 450
 451 /**
 452  * zfcp_fsf_req_complete - process completion of a FSF request
 453  * @fsf_req: The FSF request that has been completed.
 454  *
 455  * When a request has been completed either from the FCP adapter,
 456  * or it has been dismissed due to a queue shutdown, this function
 457  * is called to process the completion status and trigger further
 458  * events related to the FSF request.
 459  */
 460 void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 461 {
 462         if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 463                 zfcp_fsf_status_read_handler(req);
 464                 return;
 465         }
 466
 467         del_timer(&req->timer);
 468         zfcp_fsf_protstatus_eval(req);
 469         zfcp_fsf_fsfstatus_eval(req);
 470         req->handler(req);
 471
 472         if (req->erp_action)
 473                 zfcp_erp_notify(req->erp_action, 0);
 474         req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 475
 476         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 477                 zfcp_fsf_req_free(req);
 478         else
 479         /* notify initiator waiting for the requests completion */
 480         /*
 481          * FIXME: Race! We must not access fsf_req here as it might have been
 482          * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 483          * flag. It's an improbable case. But, we have the same paranoia for
 484          * the cleanup flag already.
 485          * Might better be handled using complete()?
 486          * (setting the flag and doing wakeup ought to be atomic
 487          *  with regard to checking the flag as long as waitqueue is
 488          *  part of the to be released structure)
 489          */
 490                 wake_up(&req->completion_wq);
 491 }
 492
 493 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 494 {
 495         struct fsf_qtcb_bottom_config *bottom;
 496         struct zfcp_adapter *adapter = req->adapter;
 497         struct Scsi_Host *shost = adapter->scsi_host;
 498
 499         bottom = &req->qtcb->bottom.config;
 500
 501         if (req->data)
 502                 memcpy(req->data, bottom, sizeof(*bottom));
 503
 504         fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
 505         fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
 506         fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
 507         fc_host_speed(shost) = bottom->fc_link_speed;
 508         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 509
 510         adapter->hydra_version = bottom->adapter_type;
 511         adapter->timer_ticks = bottom->timer_interval;
 512
 513         if (fc_host_permanent_port_name(shost) == -1)
 514                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 515
 516         switch (bottom->fc_topology) {
 517         case FSF_TOPO_P2P:
 518                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
 519                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
 520                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
 521                 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
 522                 break;
 523         case FSF_TOPO_FABRIC:
 524                 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
 525                 break;
 526         case FSF_TOPO_AL:
 527                 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
 528         default:
 529                 dev_err(&adapter->ccw_device->dev,
 530                         "Unknown or unsupported arbitrated loop "
 531                         "fibre channel topology detected\n");
 532                 zfcp_erp_adapter_shutdown(adapter, 0, 127, req);
 533                 return -EIO;
 534         }
 535
 536         return 0;
 537 }
 538
 539 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 540 {
 541         struct zfcp_adapter *adapter = req->adapter;
 542         struct fsf_qtcb *qtcb = req->qtcb;
 543         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 544         struct Scsi_Host *shost = adapter->scsi_host;
 545
 546         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 547                 return;
 548
 549         adapter->fsf_lic_version = bottom->lic_version;
 550         adapter->adapter_features = bottom->adapter_features;
 551         adapter->connection_features = bottom->connection_features;
 552         adapter->peer_wwpn = 0;
 553         adapter->peer_wwnn = 0;
 554         adapter->peer_d_id = 0;
 555
 556         switch (qtcb->header.fsf_status) {
 557         case FSF_GOOD:
 558                 if (zfcp_fsf_exchange_config_evaluate(req))
 559                         return;
 560
 561                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 562                         dev_err(&adapter->ccw_device->dev,
 563                                 "FCP adapter maximum QTCB size (%d bytes) "
 564                                 "is too small\n",
 565                                 bottom->max_qtcb_size);
 566                         zfcp_erp_adapter_shutdown(adapter, 0, 129, req);
 567                         return;
 568                 }
 569                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 570                                 &adapter->status);
 571                 break;
 572         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 573                 fc_host_node_name(shost) = 0;
 574                 fc_host_port_name(shost) = 0;
 575                 fc_host_port_id(shost) = 0;
 576                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 577                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 578                 adapter->hydra_version = 0;
 579
 580                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 581                                 &adapter->status);
 582
 583                 zfcp_fsf_link_down_info_eval(req, 42,
 584                         &qtcb->header.fsf_status_qual.link_down_info);
 585                 break;
 586         default:
 587                 zfcp_erp_adapter_shutdown(adapter, 0, 130, req);
 588                 return;
 589         }
 590
 591         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 592                 adapter->hardware_version = bottom->hardware_version;
 593                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
 594                        min(FC_SERIAL_NUMBER_SIZE, 17));
 595                 EBCASC(fc_host_serial_number(shost),
 596                        min(FC_SERIAL_NUMBER_SIZE, 17));
 597         }
 598
 599         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 600                 dev_err(&adapter->ccw_device->dev,
 601                         "The FCP adapter only supports newer "
 602                         "control block versions\n");
 603                 zfcp_erp_adapter_shutdown(adapter, 0, 125, req);
 604                 return;
 605         }
 606         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 607                 dev_err(&adapter->ccw_device->dev,
 608                         "The FCP adapter only supports older "
 609                         "control block versions\n");
 610                 zfcp_erp_adapter_shutdown(adapter, 0, 126, req);
 611         }
 612 }
 613
 614 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 615 {
 616         struct zfcp_adapter *adapter = req->adapter;
 617         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 618         struct Scsi_Host *shost = adapter->scsi_host;
 619
 620         if (req->data)
 621                 memcpy(req->data, bottom, sizeof(*bottom));
 622
 623         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 624                 fc_host_permanent_port_name(shost) = bottom->wwpn;
 625         else
 626                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 627         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 628         fc_host_supported_speeds(shost) = bottom->supported_speed;
 629 }
 630
 631 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 632 {
 633         struct fsf_qtcb *qtcb = req->qtcb;
 634
 635         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 636                 return;
 637
 638         switch (qtcb->header.fsf_status) {
 639         case FSF_GOOD:
 640                 zfcp_fsf_exchange_port_evaluate(req);
 641                 break;
 642         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 643                 zfcp_fsf_exchange_port_evaluate(req);
 644                 zfcp_fsf_link_down_info_eval(req, 43,
 645                         &qtcb->header.fsf_status_qual.link_down_info);
 646                 break;
 647         }
 648 }
 649
 650 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 651         __releases(&adapter->req_q_lock)
 652         __acquires(&adapter->req_q_lock)
 653 {
 654         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 655         long ret;
 656
 657         if (atomic_read(&req_q->count) <= -REQUEST_LIST_SIZE)
 658                 return -EIO;
 659         if (atomic_read(&req_q->count) > 0)
 660                 return 0;
 661
 662         atomic_dec(&req_q->count);
 663         spin_unlock_bh(&adapter->req_q_lock);
 664         ret = wait_event_interruptible_timeout(adapter->request_wq,
 665                                         atomic_read(&req_q->count) >= 0,
 666                                         5 * HZ);
 667         spin_lock_bh(&adapter->req_q_lock);
 668         atomic_inc(&req_q->count);
 669
 670         if (ret > 0)
 671                 return 0;
 672         if (!ret)
 673                 atomic_inc(&adapter->qdio_outb_full);
 674         return -EIO;
 675 }
 676
 677 static struct zfcp_fsf_req *zfcp_fsf_alloc_noqtcb(mempool_t *pool)
 678 {
 679         struct zfcp_fsf_req *req;
 680         req = mempool_alloc(pool, GFP_ATOMIC);
 681         if (!req)
 682                 return NULL;
 683         memset(req, 0, sizeof(*req));
 684         req->pool = pool;
 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         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         unsigned long flags;
 772         int idx;
 773
 774         /* put allocated FSF request into hash table */
 775         spin_lock_irqsave(&adapter->req_list_lock, flags);
 776         idx = zfcp_reqlist_hash(req->req_id);
 777         list_add_tail(&req->list, &adapter->req_list[idx]);
 778         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 779
 780         req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
 781         req->issued = get_clock();
 782         if (zfcp_qdio_send(req)) {
 783                 del_timer(&req->timer);
 784                 spin_lock_irqsave(&adapter->req_list_lock, flags);
 785                 /* lookup request again, list might have changed */
 786                 if (zfcp_reqlist_find_safe(adapter, req))
 787                         zfcp_reqlist_remove(adapter, req);
 788                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 789                 zfcp_erp_adapter_reopen(adapter, 0, 116, req);
 790                 return -EIO;
 791         }
 792
 793         /* Don't increase for unsolicited status */
 794         if (req->qtcb)
 795                 adapter->fsf_req_seq_no++;
 796         adapter->req_no++;
 797
 798         return 0;
 799 }
 800
 801 /**
 802  * zfcp_fsf_status_read - send status read request
 803  * @adapter: pointer to struct zfcp_adapter
 804  * @req_flags: request flags
 805  * Returns: 0 on success, ERROR otherwise
 806  */
 807 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 808 {
 809         struct zfcp_fsf_req *req;
 810         struct fsf_status_read_buffer *sr_buf;
 811         struct qdio_buffer_element *sbale;
 812         int retval = -EIO;
 813
 814         spin_lock_bh(&adapter->req_q_lock);
 815         if (zfcp_fsf_req_sbal_get(adapter))
 816                 goto out;
 817
 818         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 819                                   ZFCP_REQ_NO_QTCB,
 820                                   adapter->pool.fsf_req_status_read);
 821         if (IS_ERR(req)) {
 822                 retval = PTR_ERR(req);
 823                 goto out;
 824         }
 825
 826         sbale = zfcp_qdio_sbale_req(req);
 827         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 828         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 829         req->sbale_curr = 2;
 830
 831         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 832         if (!sr_buf) {
 833                 retval = -ENOMEM;
 834                 goto failed_buf;
 835         }
 836         memset(sr_buf, 0, sizeof(*sr_buf));
 837         req->data = sr_buf;
 838         sbale = zfcp_qdio_sbale_curr(req);
 839         sbale->addr = (void *) sr_buf;
 840         sbale->length = sizeof(*sr_buf);
 841
 842         retval = zfcp_fsf_req_send(req);
 843         if (retval)
 844                 goto failed_req_send;
 845
 846         goto out;
 847
 848 failed_req_send:
 849         mempool_free(sr_buf, adapter->pool.data_status_read);
 850 failed_buf:
 851         zfcp_fsf_req_free(req);
 852         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 853 out:
 854         spin_unlock_bh(&adapter->req_q_lock);
 855         return retval;
 856 }
 857
 858 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 859 {
 860         struct zfcp_unit *unit = req->data;
 861         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 862
 863         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 864                 return;
 865
 866         switch (req->qtcb->header.fsf_status) {
 867         case FSF_PORT_HANDLE_NOT_VALID:
 868                 if (fsq->word[0] == fsq->word[1]) {
 869                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
 870                                                 req);
 871                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 872                 }
 873                 break;
 874         case FSF_LUN_HANDLE_NOT_VALID:
 875                 if (fsq->word[0] == fsq->word[1]) {
 876                         zfcp_erp_port_reopen(unit->port, 0, 105, req);
 877                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 878                 }
 879                 break;
 880         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 881                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 882                 break;
 883         case FSF_PORT_BOXED:
 884                 zfcp_erp_port_boxed(unit->port, 47, req);
 885                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 886                                ZFCP_STATUS_FSFREQ_RETRY;
 887                 break;
 888         case FSF_LUN_BOXED:
 889                 zfcp_erp_unit_boxed(unit, 48, req);
 890                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 891                                ZFCP_STATUS_FSFREQ_RETRY;
 892                 break;
 893         case FSF_ADAPTER_STATUS_AVAILABLE:
 894                 switch (fsq->word[0]) {
 895                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 896                         zfcp_test_link(unit->port);
 897                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 898                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 899                         break;
 900                 }
 901                 break;
 902         case FSF_GOOD:
 903                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 904                 break;
 905         }
 906 }
 907
 908 /**
 909  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 910  * @old_req_id: unsigned long
 911  * @unit: pointer to struct zfcp_unit
 912  * Returns: pointer to struct zfcp_fsf_req
 913  */
 914
 915 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 916                                                 struct zfcp_unit *unit)
 917 {
 918         struct qdio_buffer_element *sbale;
 919         struct zfcp_fsf_req *req = NULL;
 920         struct zfcp_adapter *adapter = unit->port->adapter;
 921
 922         spin_lock_bh(&adapter->req_q_lock);
 923         if (zfcp_fsf_req_sbal_get(adapter))
 924                 goto out;
 925         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 926                                   0, adapter->pool.fsf_req_abort);
 927         if (IS_ERR(req)) {
 928                 req = NULL;
 929                 goto out;
 930         }
 931
 932         if (unlikely(!(atomic_read(&unit->status) &
 933                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 934                 goto out_error_free;
 935
 936         sbale = zfcp_qdio_sbale_req(req);
 937         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 938         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 939
 940         req->data = unit;
 941         req->handler = zfcp_fsf_abort_fcp_command_handler;
 942         req->qtcb->header.lun_handle = unit->handle;
 943         req->qtcb->header.port_handle = unit->port->handle;
 944         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 945
 946         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 947         if (!zfcp_fsf_req_send(req))
 948                 goto out;
 949
 950 out_error_free:
 951         zfcp_fsf_req_free(req);
 952         req = NULL;
 953 out:
 954         spin_unlock_bh(&adapter->req_q_lock);
 955         return req;
 956 }
 957
 958 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 959 {
 960         struct zfcp_adapter *adapter = req->adapter;
 961         struct zfcp_send_ct *send_ct = req->data;
 962         struct fsf_qtcb_header *header = &req->qtcb->header;
 963
 964         send_ct->status = -EINVAL;
 965
 966         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 967                 goto skip_fsfstatus;
 968
 969         switch (header->fsf_status) {
 970         case FSF_GOOD:
 971                 zfcp_san_dbf_event_ct_response(req);
 972                 send_ct->status = 0;
 973                 break;
 974         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 975                 zfcp_fsf_class_not_supp(req);
 976                 break;
 977         case FSF_ADAPTER_STATUS_AVAILABLE:
 978                 switch (header->fsf_status_qual.word[0]){
 979                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 980                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 981                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 982                         break;
 983                 }
 984                 break;
 985         case FSF_ACCESS_DENIED:
 986                 break;
 987         case FSF_PORT_BOXED:
 988                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 989                                ZFCP_STATUS_FSFREQ_RETRY;
 990                 break;
 991         case FSF_PORT_HANDLE_NOT_VALID:
 992                 zfcp_erp_adapter_reopen(adapter, 0, 106, req);
 993         case FSF_GENERIC_COMMAND_REJECTED:
 994         case FSF_PAYLOAD_SIZE_MISMATCH:
 995         case FSF_REQUEST_SIZE_TOO_LARGE:
 996         case FSF_RESPONSE_SIZE_TOO_LARGE:
 997         case FSF_SBAL_MISMATCH:
 998                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 999                 break;
1000         }
1001
1002 skip_fsfstatus:
1003         if (send_ct->handler)
1004                 send_ct->handler(send_ct->handler_data);
1005 }
1006
1007 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1008                                        struct scatterlist *sg_req,
1009                                        struct scatterlist *sg_resp,
1010                                        int max_sbals)
1011 {
1012         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(req);
1013         u32 feat = req->adapter->adapter_features;
1014         int bytes;
1015
1016         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1017                 if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
1018                     !sg_is_last(sg_req) || !sg_is_last(sg_resp))
1019                         return -EOPNOTSUPP;
1020
1021                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1022                 sbale[2].addr   = sg_virt(sg_req);
1023                 sbale[2].length = sg_req->length;
1024                 sbale[3].addr   = sg_virt(sg_resp);
1025                 sbale[3].length = sg_resp->length;
1026                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1027                 return 0;
1028         }
1029
1030         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1031                                         sg_req, max_sbals);
1032         if (bytes <= 0)
1033                 return -ENOMEM;
1034         req->qtcb->bottom.support.req_buf_length = bytes;
1035         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1036
1037         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1038                                         sg_resp, max_sbals);
1039         if (bytes <= 0)
1040                 return -ENOMEM;
1041         req->qtcb->bottom.support.resp_buf_length = bytes;
1042
1043         return 0;
1044 }
1045
1046 /**
1047  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1048  * @ct: pointer to struct zfcp_send_ct with data for request
1049  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1050  * @erp_action: if non-null the Generic Service request sent within ERP
1051  */
1052 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1053                      struct zfcp_erp_action *erp_action)
1054 {
1055         struct zfcp_wka_port *wka_port = ct->wka_port;
1056         struct zfcp_adapter *adapter = wka_port->adapter;
1057         struct zfcp_fsf_req *req;
1058         int ret = -EIO;
1059
1060         spin_lock_bh(&adapter->req_q_lock);
1061         if (zfcp_fsf_req_sbal_get(adapter))
1062                 goto out;
1063
1064         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1065                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1066         if (IS_ERR(req)) {
1067                 ret = PTR_ERR(req);
1068                 goto out;
1069         }
1070
1071         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1072                                           FSF_MAX_SBALS_PER_REQ);
1073         if (ret)
1074                 goto failed_send;
1075
1076         req->handler = zfcp_fsf_send_ct_handler;
1077         req->qtcb->header.port_handle = wka_port->handle;
1078         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1079         req->qtcb->bottom.support.timeout = ct->timeout;
1080         req->data = ct;
1081
1082         zfcp_san_dbf_event_ct_request(req);
1083
1084         if (erp_action) {
1085                 erp_action->fsf_req = req;
1086                 req->erp_action = erp_action;
1087                 zfcp_fsf_start_erp_timer(req);
1088         } else
1089                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1090
1091         ret = zfcp_fsf_req_send(req);
1092         if (ret)
1093                 goto failed_send;
1094
1095         goto out;
1096
1097 failed_send:
1098         zfcp_fsf_req_free(req);
1099         if (erp_action)
1100                 erp_action->fsf_req = NULL;
1101 out:
1102         spin_unlock_bh(&adapter->req_q_lock);
1103         return ret;
1104 }
1105
1106 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1107 {
1108         struct zfcp_send_els *send_els = req->data;
1109         struct zfcp_port *port = send_els->port;
1110         struct fsf_qtcb_header *header = &req->qtcb->header;
1111
1112         send_els->status = -EINVAL;
1113
1114         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1115                 goto skip_fsfstatus;
1116
1117         switch (header->fsf_status) {
1118         case FSF_GOOD:
1119                 zfcp_san_dbf_event_els_response(req);
1120                 send_els->status = 0;
1121                 break;
1122         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1123                 zfcp_fsf_class_not_supp(req);
1124                 break;
1125         case FSF_ADAPTER_STATUS_AVAILABLE:
1126                 switch (header->fsf_status_qual.word[0]){
1127                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1128                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1129                                 zfcp_test_link(port);
1130                         /*fall through */
1131                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1132                 case FSF_SQ_RETRY_IF_POSSIBLE:
1133                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1134                         break;
1135                 }
1136                 break;
1137         case FSF_ELS_COMMAND_REJECTED:
1138         case FSF_PAYLOAD_SIZE_MISMATCH:
1139         case FSF_REQUEST_SIZE_TOO_LARGE:
1140         case FSF_RESPONSE_SIZE_TOO_LARGE:
1141                 break;
1142         case FSF_ACCESS_DENIED:
1143                 zfcp_fsf_access_denied_port(req, port);
1144                 break;
1145         case FSF_SBAL_MISMATCH:
1146                 /* should never occure, avoided in zfcp_fsf_send_els */
1147                 /* fall through */
1148         default:
1149                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1150                 break;
1151         }
1152 skip_fsfstatus:
1153         if (send_els->handler)
1154                 send_els->handler(send_els->handler_data);
1155 }
1156
1157 /**
1158  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1159  * @els: pointer to struct zfcp_send_els with data for the command
1160  */
1161 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1162 {
1163         struct zfcp_fsf_req *req;
1164         struct zfcp_adapter *adapter = els->adapter;
1165         struct fsf_qtcb_bottom_support *bottom;
1166         int ret = -EIO;
1167
1168         if (unlikely(!(atomic_read(&els->port->status) &
1169                        ZFCP_STATUS_COMMON_UNBLOCKED)))
1170                 return -EBUSY;
1171
1172         spin_lock_bh(&adapter->req_q_lock);
1173         if (zfcp_fsf_req_sbal_get(adapter))
1174                 goto out;
1175         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1176                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1177         if (IS_ERR(req)) {
1178                 ret = PTR_ERR(req);
1179                 goto out;
1180         }
1181
1182         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1183
1184         if (ret)
1185                 goto failed_send;
1186
1187         bottom = &req->qtcb->bottom.support;
1188         req->handler = zfcp_fsf_send_els_handler;
1189         bottom->d_id = els->d_id;
1190         bottom->service_class = FSF_CLASS_3;
1191         bottom->timeout = 2 * R_A_TOV;
1192         req->data = els;
1193
1194         zfcp_san_dbf_event_els_request(req);
1195
1196         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1197         ret = zfcp_fsf_req_send(req);
1198         if (ret)
1199                 goto failed_send;
1200
1201         goto out;
1202
1203 failed_send:
1204         zfcp_fsf_req_free(req);
1205 out:
1206         spin_unlock_bh(&adapter->req_q_lock);
1207         return ret;
1208 }
1209
1210 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1211 {
1212         struct qdio_buffer_element *sbale;
1213         struct zfcp_fsf_req *req;
1214         struct zfcp_adapter *adapter = erp_action->adapter;
1215         int retval = -EIO;
1216
1217         spin_lock_bh(&adapter->req_q_lock);
1218         if (zfcp_fsf_req_sbal_get(adapter))
1219                 goto out;
1220         req = zfcp_fsf_req_create(adapter,
1221                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1222                                   ZFCP_REQ_AUTO_CLEANUP,
1223                                   adapter->pool.fsf_req_erp);
1224         if (IS_ERR(req)) {
1225                 retval = PTR_ERR(req);
1226                 goto out;
1227         }
1228
1229         sbale = zfcp_qdio_sbale_req(req);
1230         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1231         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1232
1233         req->qtcb->bottom.config.feature_selection =
1234                         FSF_FEATURE_CFDC |
1235                         FSF_FEATURE_LUN_SHARING |
1236                         FSF_FEATURE_NOTIFICATION_LOST |
1237                         FSF_FEATURE_UPDATE_ALERT;
1238         req->erp_action = erp_action;
1239         req->handler = zfcp_fsf_exchange_config_data_handler;
1240         erp_action->fsf_req = req;
1241
1242         zfcp_fsf_start_erp_timer(req);
1243         retval = zfcp_fsf_req_send(req);
1244         if (retval) {
1245                 zfcp_fsf_req_free(req);
1246                 erp_action->fsf_req = NULL;
1247         }
1248 out:
1249         spin_unlock_bh(&adapter->req_q_lock);
1250         return retval;
1251 }
1252
1253 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1254                                        struct fsf_qtcb_bottom_config *data)
1255 {
1256         struct qdio_buffer_element *sbale;
1257         struct zfcp_fsf_req *req = NULL;
1258         int retval = -EIO;
1259
1260         spin_lock_bh(&adapter->req_q_lock);
1261         if (zfcp_fsf_req_sbal_get(adapter))
1262                 goto out;
1263
1264         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1265                                   0, NULL);
1266         if (IS_ERR(req)) {
1267                 retval = PTR_ERR(req);
1268                 goto out;
1269         }
1270
1271         sbale = zfcp_qdio_sbale_req(req);
1272         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1273         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1274         req->handler = zfcp_fsf_exchange_config_data_handler;
1275
1276         req->qtcb->bottom.config.feature_selection =
1277                         FSF_FEATURE_CFDC |
1278                         FSF_FEATURE_LUN_SHARING |
1279                         FSF_FEATURE_NOTIFICATION_LOST |
1280                         FSF_FEATURE_UPDATE_ALERT;
1281
1282         if (data)
1283                 req->data = data;
1284
1285         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1286         retval = zfcp_fsf_req_send(req);
1287 out:
1288         spin_unlock_bh(&adapter->req_q_lock);
1289         if (!retval)
1290                 wait_event(req->completion_wq,
1291                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1292
1293         zfcp_fsf_req_free(req);
1294
1295         return retval;
1296 }
1297
1298 /**
1299  * zfcp_fsf_exchange_port_data - request information about local port
1300  * @erp_action: ERP action for the adapter for which port data is requested
1301  * Returns: 0 on success, error otherwise
1302  */
1303 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1304 {
1305         struct qdio_buffer_element *sbale;
1306         struct zfcp_fsf_req *req;
1307         struct zfcp_adapter *adapter = erp_action->adapter;
1308         int retval = -EIO;
1309
1310         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1311                 return -EOPNOTSUPP;
1312
1313         spin_lock_bh(&adapter->req_q_lock);
1314         if (zfcp_fsf_req_sbal_get(adapter))
1315                 goto out;
1316         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1317                                   ZFCP_REQ_AUTO_CLEANUP,
1318                                   adapter->pool.fsf_req_erp);
1319         if (IS_ERR(req)) {
1320                 retval = PTR_ERR(req);
1321                 goto out;
1322         }
1323
1324         sbale = zfcp_qdio_sbale_req(req);
1325         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1326         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1327
1328         req->handler = zfcp_fsf_exchange_port_data_handler;
1329         req->erp_action = erp_action;
1330         erp_action->fsf_req = req;
1331
1332         zfcp_fsf_start_erp_timer(req);
1333         retval = zfcp_fsf_req_send(req);
1334         if (retval) {
1335                 zfcp_fsf_req_free(req);
1336                 erp_action->fsf_req = NULL;
1337         }
1338 out:
1339         spin_unlock_bh(&adapter->req_q_lock);
1340         return retval;
1341 }
1342
1343 /**
1344  * zfcp_fsf_exchange_port_data_sync - request information about local port
1345  * @adapter: pointer to struct zfcp_adapter
1346  * @data: pointer to struct fsf_qtcb_bottom_port
1347  * Returns: 0 on success, error otherwise
1348  */
1349 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1350                                      struct fsf_qtcb_bottom_port *data)
1351 {
1352         struct qdio_buffer_element *sbale;
1353         struct zfcp_fsf_req *req = NULL;
1354         int retval = -EIO;
1355
1356         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1357                 return -EOPNOTSUPP;
1358
1359         spin_lock_bh(&adapter->req_q_lock);
1360         if (zfcp_fsf_req_sbal_get(adapter))
1361                 goto out;
1362
1363         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1364                                   NULL);
1365         if (IS_ERR(req)) {
1366                 retval = PTR_ERR(req);
1367                 goto out;
1368         }
1369
1370         if (data)
1371                 req->data = data;
1372
1373         sbale = zfcp_qdio_sbale_req(req);
1374         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1375         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1376
1377         req->handler = zfcp_fsf_exchange_port_data_handler;
1378         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1379         retval = zfcp_fsf_req_send(req);
1380 out:
1381         spin_unlock_bh(&adapter->req_q_lock);
1382         if (!retval)
1383                 wait_event(req->completion_wq,
1384                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1385         zfcp_fsf_req_free(req);
1386
1387         return retval;
1388 }
1389
1390 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1391 {
1392         struct zfcp_port *port = req->data;
1393         struct fsf_qtcb_header *header = &req->qtcb->header;
1394         struct fsf_plogi *plogi;
1395
1396         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1397                 return;
1398
1399         switch (header->fsf_status) {
1400         case FSF_PORT_ALREADY_OPEN:
1401                 break;
1402         case FSF_ACCESS_DENIED:
1403                 zfcp_fsf_access_denied_port(req, port);
1404                 break;
1405         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1406                 dev_warn(&req->adapter->ccw_device->dev,
1407                          "Not enough FCP adapter resources to open "
1408                          "remote port 0x%016Lx\n",
1409                          (unsigned long long)port->wwpn);
1410                 zfcp_erp_port_failed(port, 31, req);
1411                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1412                 break;
1413         case FSF_ADAPTER_STATUS_AVAILABLE:
1414                 switch (header->fsf_status_qual.word[0]) {
1415                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1416                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1417                 case FSF_SQ_NO_RETRY_POSSIBLE:
1418                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1419                         break;
1420                 }
1421                 break;
1422         case FSF_GOOD:
1423                 port->handle = header->port_handle;
1424                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1425                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1426                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1427                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1428                                   &port->status);
1429                 /* check whether D_ID has changed during open */
1430                 /*
1431                  * FIXME: This check is not airtight, as the FCP channel does
1432                  * not monitor closures of target port connections caused on
1433                  * the remote side. Thus, they might miss out on invalidating
1434                  * locally cached WWPNs (and other N_Port parameters) of gone
1435                  * target ports. So, our heroic attempt to make things safe
1436                  * could be undermined by 'open port' response data tagged with
1437                  * obsolete WWPNs. Another reason to monitor potential
1438                  * connection closures ourself at least (by interpreting
1439                  * incoming ELS' and unsolicited status). It just crosses my
1440                  * mind that one should be able to cross-check by means of
1441                  * another GID_PN straight after a port has been opened.
1442                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1443                  */
1444                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1445                 if (req->qtcb->bottom.support.els1_length >=
1446                     FSF_PLOGI_MIN_LEN) {
1447                         if (plogi->serv_param.wwpn != port->wwpn)
1448                                 port->d_id = 0;
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
1461 /**
1462  * zfcp_fsf_open_port - create and send open port request
1463  * @erp_action: pointer to struct zfcp_erp_action
1464  * Returns: 0 on success, error otherwise
1465  */
1466 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1467 {
1468         struct qdio_buffer_element *sbale;
1469         struct zfcp_adapter *adapter = erp_action->adapter;
1470         struct zfcp_fsf_req *req;
1471         int retval = -EIO;
1472
1473         spin_lock_bh(&adapter->req_q_lock);
1474         if (zfcp_fsf_req_sbal_get(adapter))
1475                 goto out;
1476
1477         req = zfcp_fsf_req_create(adapter,
1478                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1479                                   ZFCP_REQ_AUTO_CLEANUP,
1480                                   adapter->pool.fsf_req_erp);
1481         if (IS_ERR(req)) {
1482                 retval = PTR_ERR(req);
1483                 goto out;
1484         }
1485
1486         sbale = zfcp_qdio_sbale_req(req);
1487         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1488         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1489
1490         req->handler = zfcp_fsf_open_port_handler;
1491         req->qtcb->bottom.support.d_id = erp_action->port->d_id;
1492         req->data = erp_action->port;
1493         req->erp_action = erp_action;
1494         erp_action->fsf_req = req;
1495
1496         zfcp_fsf_start_erp_timer(req);
1497         retval = zfcp_fsf_req_send(req);
1498         if (retval) {
1499                 zfcp_fsf_req_free(req);
1500                 erp_action->fsf_req = NULL;
1501         }
1502 out:
1503         spin_unlock_bh(&adapter->req_q_lock);
1504         return retval;
1505 }
1506
1507 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1508 {
1509         struct zfcp_port *port = req->data;
1510
1511         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1512                 return;
1513
1514         switch (req->qtcb->header.fsf_status) {
1515         case FSF_PORT_HANDLE_NOT_VALID:
1516                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, req);
1517                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1518                 break;
1519         case FSF_ADAPTER_STATUS_AVAILABLE:
1520                 break;
1521         case FSF_GOOD:
1522                 zfcp_erp_modify_port_status(port, 33, req,
1523                                             ZFCP_STATUS_COMMON_OPEN,
1524                                             ZFCP_CLEAR);
1525                 break;
1526         }
1527 }
1528
1529 /**
1530  * zfcp_fsf_close_port - create and send close port request
1531  * @erp_action: pointer to struct zfcp_erp_action
1532  * Returns: 0 on success, error otherwise
1533  */
1534 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1535 {
1536         struct qdio_buffer_element *sbale;
1537         struct zfcp_adapter *adapter = erp_action->adapter;
1538         struct zfcp_fsf_req *req;
1539         int retval = -EIO;
1540
1541         spin_lock_bh(&adapter->req_q_lock);
1542         if (zfcp_fsf_req_sbal_get(adapter))
1543                 goto out;
1544
1545         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1546                                   ZFCP_REQ_AUTO_CLEANUP,
1547                                   adapter->pool.fsf_req_erp);
1548         if (IS_ERR(req)) {
1549                 retval = PTR_ERR(req);
1550                 goto out;
1551         }
1552
1553         sbale = zfcp_qdio_sbale_req(req);
1554         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1555         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1556
1557         req->handler = zfcp_fsf_close_port_handler;
1558         req->data = erp_action->port;
1559         req->erp_action = erp_action;
1560         req->qtcb->header.port_handle = erp_action->port->handle;
1561         erp_action->fsf_req = req;
1562
1563         zfcp_fsf_start_erp_timer(req);
1564         retval = zfcp_fsf_req_send(req);
1565         if (retval) {
1566                 zfcp_fsf_req_free(req);
1567                 erp_action->fsf_req = NULL;
1568         }
1569 out:
1570         spin_unlock_bh(&adapter->req_q_lock);
1571         return retval;
1572 }
1573
1574 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1575 {
1576         struct zfcp_wka_port *wka_port = req->data;
1577         struct fsf_qtcb_header *header = &req->qtcb->header;
1578
1579         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1580                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1581                 goto out;
1582         }
1583
1584         switch (header->fsf_status) {
1585         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1586                 dev_warn(&req->adapter->ccw_device->dev,
1587                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1588         case FSF_ADAPTER_STATUS_AVAILABLE:
1589                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1590         case FSF_ACCESS_DENIED:
1591                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1592                 break;
1593         case FSF_PORT_ALREADY_OPEN:
1594                 break;
1595         case FSF_GOOD:
1596                 wka_port->handle = header->port_handle;
1597                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1598         }
1599 out:
1600         wake_up(&wka_port->completion_wq);
1601 }
1602
1603 /**
1604  * zfcp_fsf_open_wka_port - create and send open wka-port request
1605  * @wka_port: pointer to struct zfcp_wka_port
1606  * Returns: 0 on success, error otherwise
1607  */
1608 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1609 {
1610         struct qdio_buffer_element *sbale;
1611         struct zfcp_adapter *adapter = wka_port->adapter;
1612         struct zfcp_fsf_req *req;
1613         int retval = -EIO;
1614
1615         spin_lock_bh(&adapter->req_q_lock);
1616         if (zfcp_fsf_req_sbal_get(adapter))
1617                 goto out;
1618
1619         req = zfcp_fsf_req_create(adapter,
1620                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1621                                   ZFCP_REQ_AUTO_CLEANUP,
1622                                   adapter->pool.fsf_req_erp);
1623         if (unlikely(IS_ERR(req))) {
1624                 retval = PTR_ERR(req);
1625                 goto out;
1626         }
1627
1628         sbale = zfcp_qdio_sbale_req(req);
1629         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1630         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1631
1632         req->handler = zfcp_fsf_open_wka_port_handler;
1633         req->qtcb->bottom.support.d_id = wka_port->d_id;
1634         req->data = wka_port;
1635
1636         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1637         retval = zfcp_fsf_req_send(req);
1638         if (retval)
1639                 zfcp_fsf_req_free(req);
1640 out:
1641         spin_unlock_bh(&adapter->req_q_lock);
1642         return retval;
1643 }
1644
1645 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1646 {
1647         struct zfcp_wka_port *wka_port = req->data;
1648
1649         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1650                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1651                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, 84, req);
1652         }
1653
1654         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1655         wake_up(&wka_port->completion_wq);
1656 }
1657
1658 /**
1659  * zfcp_fsf_close_wka_port - create and send close wka port request
1660  * @erp_action: pointer to struct zfcp_erp_action
1661  * Returns: 0 on success, error otherwise
1662  */
1663 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1664 {
1665         struct qdio_buffer_element *sbale;
1666         struct zfcp_adapter *adapter = wka_port->adapter;
1667         struct zfcp_fsf_req *req;
1668         int retval = -EIO;
1669
1670         spin_lock_bh(&adapter->req_q_lock);
1671         if (zfcp_fsf_req_sbal_get(adapter))
1672                 goto out;
1673
1674         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1675                                   ZFCP_REQ_AUTO_CLEANUP,
1676                                   adapter->pool.fsf_req_erp);
1677         if (unlikely(IS_ERR(req))) {
1678                 retval = PTR_ERR(req);
1679                 goto out;
1680         }
1681
1682         sbale = zfcp_qdio_sbale_req(req);
1683         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1684         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1685
1686         req->handler = zfcp_fsf_close_wka_port_handler;
1687         req->data = wka_port;
1688         req->qtcb->header.port_handle = wka_port->handle;
1689
1690         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1691         retval = zfcp_fsf_req_send(req);
1692         if (retval)
1693                 zfcp_fsf_req_free(req);
1694 out:
1695         spin_unlock_bh(&adapter->req_q_lock);
1696         return retval;
1697 }
1698
1699 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1700 {
1701         struct zfcp_port *port = req->data;
1702         struct fsf_qtcb_header *header = &req->qtcb->header;
1703         struct zfcp_unit *unit;
1704
1705         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1706                 return;
1707
1708         switch (header->fsf_status) {
1709         case FSF_PORT_HANDLE_NOT_VALID:
1710                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, req);
1711                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1712                 break;
1713         case FSF_ACCESS_DENIED:
1714                 zfcp_fsf_access_denied_port(req, port);
1715                 break;
1716         case FSF_PORT_BOXED:
1717                 zfcp_erp_port_boxed(port, 50, req);
1718                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1719                                ZFCP_STATUS_FSFREQ_RETRY;
1720                 /* can't use generic zfcp_erp_modify_port_status because
1721                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1722                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1723                 list_for_each_entry(unit, &port->unit_list_head, list)
1724                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1725                                           &unit->status);
1726                 break;
1727         case FSF_ADAPTER_STATUS_AVAILABLE:
1728                 switch (header->fsf_status_qual.word[0]) {
1729                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1730                         /* fall through */
1731                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1732                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1733                         break;
1734                 }
1735                 break;
1736         case FSF_GOOD:
1737                 /* can't use generic zfcp_erp_modify_port_status because
1738                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1739                  */
1740                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1741                 list_for_each_entry(unit, &port->unit_list_head, list)
1742                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1743                                           &unit->status);
1744                 break;
1745         }
1746 }
1747
1748 /**
1749  * zfcp_fsf_close_physical_port - close physical port
1750  * @erp_action: pointer to struct zfcp_erp_action
1751  * Returns: 0 on success
1752  */
1753 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1754 {
1755         struct qdio_buffer_element *sbale;
1756         struct zfcp_adapter *adapter = erp_action->adapter;
1757         struct zfcp_fsf_req *req;
1758         int retval = -EIO;
1759
1760         spin_lock_bh(&adapter->req_q_lock);
1761         if (zfcp_fsf_req_sbal_get(adapter))
1762                 goto out;
1763
1764         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1765                                   ZFCP_REQ_AUTO_CLEANUP,
1766                                   adapter->pool.fsf_req_erp);
1767         if (IS_ERR(req)) {
1768                 retval = PTR_ERR(req);
1769                 goto out;
1770         }
1771
1772         sbale = zfcp_qdio_sbale_req(req);
1773         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1774         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1775
1776         req->data = erp_action->port;
1777         req->qtcb->header.port_handle = erp_action->port->handle;
1778         req->erp_action = erp_action;
1779         req->handler = zfcp_fsf_close_physical_port_handler;
1780         erp_action->fsf_req = req;
1781
1782         zfcp_fsf_start_erp_timer(req);
1783         retval = zfcp_fsf_req_send(req);
1784         if (retval) {
1785                 zfcp_fsf_req_free(req);
1786                 erp_action->fsf_req = NULL;
1787         }
1788 out:
1789         spin_unlock_bh(&adapter->req_q_lock);
1790         return retval;
1791 }
1792
1793 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1794 {
1795         struct zfcp_adapter *adapter = req->adapter;
1796         struct zfcp_unit *unit = req->data;
1797         struct fsf_qtcb_header *header = &req->qtcb->header;
1798         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1799         struct fsf_queue_designator *queue_designator =
1800                                 &header->fsf_status_qual.fsf_queue_designator;
1801         int exclusive, readwrite;
1802
1803         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1804                 return;
1805
1806         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1807                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1808                           ZFCP_STATUS_UNIT_SHARED |
1809                           ZFCP_STATUS_UNIT_READONLY,
1810                           &unit->status);
1811
1812         switch (header->fsf_status) {
1813
1814         case FSF_PORT_HANDLE_NOT_VALID:
1815                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, req);
1816                 /* fall through */
1817         case FSF_LUN_ALREADY_OPEN:
1818                 break;
1819         case FSF_ACCESS_DENIED:
1820                 zfcp_fsf_access_denied_unit(req, unit);
1821                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1822                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1823                 break;
1824         case FSF_PORT_BOXED:
1825                 zfcp_erp_port_boxed(unit->port, 51, req);
1826                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1827                                ZFCP_STATUS_FSFREQ_RETRY;
1828                 break;
1829         case FSF_LUN_SHARING_VIOLATION:
1830                 if (header->fsf_status_qual.word[0])
1831                         dev_warn(&adapter->ccw_device->dev,
1832                                  "LUN 0x%Lx on port 0x%Lx is already in "
1833                                  "use by CSS%d, MIF Image ID %x\n",
1834                                  (unsigned long long)unit->fcp_lun,
1835                                  (unsigned long long)unit->port->wwpn,
1836                                  queue_designator->cssid,
1837                                  queue_designator->hla);
1838                 else
1839                         zfcp_act_eval_err(adapter,
1840                                           header->fsf_status_qual.word[2]);
1841                 zfcp_erp_unit_access_denied(unit, 60, req);
1842                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1843                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1844                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1845                 break;
1846         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1847                 dev_warn(&adapter->ccw_device->dev,
1848                          "No handle is available for LUN "
1849                          "0x%016Lx on port 0x%016Lx\n",
1850                          (unsigned long long)unit->fcp_lun,
1851                          (unsigned long long)unit->port->wwpn);
1852                 zfcp_erp_unit_failed(unit, 34, req);
1853                 /* fall through */
1854         case FSF_INVALID_COMMAND_OPTION:
1855                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1856                 break;
1857         case FSF_ADAPTER_STATUS_AVAILABLE:
1858                 switch (header->fsf_status_qual.word[0]) {
1859                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1860                         zfcp_test_link(unit->port);
1861                         /* fall through */
1862                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1863                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1864                         break;
1865                 }
1866                 break;
1867
1868         case FSF_GOOD:
1869                 unit->handle = header->lun_handle;
1870                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1871
1872                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1873                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1874                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1875                         exclusive = (bottom->lun_access_info &
1876                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1877                         readwrite = (bottom->lun_access_info &
1878                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1879
1880                         if (!exclusive)
1881                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1882                                                 &unit->status);
1883
1884                         if (!readwrite) {
1885                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1886                                                 &unit->status);
1887                                 dev_info(&adapter->ccw_device->dev,
1888                                          "SCSI device at LUN 0x%016Lx on port "
1889                                          "0x%016Lx opened read-only\n",
1890                                          (unsigned long long)unit->fcp_lun,
1891                                          (unsigned long long)unit->port->wwpn);
1892                         }
1893
1894                         if (exclusive && !readwrite) {
1895                                 dev_err(&adapter->ccw_device->dev,
1896                                         "Exclusive read-only access not "
1897                                         "supported (unit 0x%016Lx, "
1898                                         "port 0x%016Lx)\n",
1899                                         (unsigned long long)unit->fcp_lun,
1900                                         (unsigned long long)unit->port->wwpn);
1901                                 zfcp_erp_unit_failed(unit, 35, req);
1902                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1903                                 zfcp_erp_unit_shutdown(unit, 0, 80, req);
1904                         } else if (!exclusive && readwrite) {
1905                                 dev_err(&adapter->ccw_device->dev,
1906                                         "Shared read-write access not "
1907                                         "supported (unit 0x%016Lx, port "
1908                                         "0x%016Lx)\n",
1909                                         (unsigned long long)unit->fcp_lun,
1910                                         (unsigned long long)unit->port->wwpn);
1911                                 zfcp_erp_unit_failed(unit, 36, req);
1912                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1913                                 zfcp_erp_unit_shutdown(unit, 0, 81, req);
1914                         }
1915                 }
1916                 break;
1917         }
1918 }
1919
1920 /**
1921  * zfcp_fsf_open_unit - open unit
1922  * @erp_action: pointer to struct zfcp_erp_action
1923  * Returns: 0 on success, error otherwise
1924  */
1925 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1926 {
1927         struct qdio_buffer_element *sbale;
1928         struct zfcp_adapter *adapter = erp_action->adapter;
1929         struct zfcp_fsf_req *req;
1930         int retval = -EIO;
1931
1932         spin_lock_bh(&adapter->req_q_lock);
1933         if (zfcp_fsf_req_sbal_get(adapter))
1934                 goto out;
1935
1936         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1937                                   ZFCP_REQ_AUTO_CLEANUP,
1938                                   adapter->pool.fsf_req_erp);
1939         if (IS_ERR(req)) {
1940                 retval = PTR_ERR(req);
1941                 goto out;
1942         }
1943
1944         sbale = zfcp_qdio_sbale_req(req);
1945         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1946         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1947
1948         req->qtcb->header.port_handle = erp_action->port->handle;
1949         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1950         req->handler = zfcp_fsf_open_unit_handler;
1951         req->data = erp_action->unit;
1952         req->erp_action = erp_action;
1953         erp_action->fsf_req = req;
1954
1955         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1956                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1957
1958         zfcp_fsf_start_erp_timer(req);
1959         retval = zfcp_fsf_req_send(req);
1960         if (retval) {
1961                 zfcp_fsf_req_free(req);
1962                 erp_action->fsf_req = NULL;
1963         }
1964 out:
1965         spin_unlock_bh(&adapter->req_q_lock);
1966         return retval;
1967 }
1968
1969 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1970 {
1971         struct zfcp_unit *unit = req->data;
1972
1973         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1974                 return;
1975
1976         switch (req->qtcb->header.fsf_status) {
1977         case FSF_PORT_HANDLE_NOT_VALID:
1978                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, req);
1979                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1980                 break;
1981         case FSF_LUN_HANDLE_NOT_VALID:
1982                 zfcp_erp_port_reopen(unit->port, 0, 111, req);
1983                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1984                 break;
1985         case FSF_PORT_BOXED:
1986                 zfcp_erp_port_boxed(unit->port, 52, req);
1987                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1988                                ZFCP_STATUS_FSFREQ_RETRY;
1989                 break;
1990         case FSF_ADAPTER_STATUS_AVAILABLE:
1991                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
1992                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1993                         zfcp_test_link(unit->port);
1994                         /* fall through */
1995                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1996                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1997                         break;
1998                 }
1999                 break;
2000         case FSF_GOOD:
2001                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2002                 break;
2003         }
2004 }
2005
2006 /**
2007  * zfcp_fsf_close_unit - close zfcp unit
2008  * @erp_action: pointer to struct zfcp_unit
2009  * Returns: 0 on success, error otherwise
2010  */
2011 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2012 {
2013         struct qdio_buffer_element *sbale;
2014         struct zfcp_adapter *adapter = erp_action->adapter;
2015         struct zfcp_fsf_req *req;
2016         int retval = -EIO;
2017
2018         spin_lock_bh(&adapter->req_q_lock);
2019         if (zfcp_fsf_req_sbal_get(adapter))
2020                 goto out;
2021         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2022                                   ZFCP_REQ_AUTO_CLEANUP,
2023                                   adapter->pool.fsf_req_erp);
2024         if (IS_ERR(req)) {
2025                 retval = PTR_ERR(req);
2026                 goto out;
2027         }
2028
2029         sbale = zfcp_qdio_sbale_req(req);
2030         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2031         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2032
2033         req->qtcb->header.port_handle = erp_action->port->handle;
2034         req->qtcb->header.lun_handle = erp_action->unit->handle;
2035         req->handler = zfcp_fsf_close_unit_handler;
2036         req->data = erp_action->unit;
2037         req->erp_action = erp_action;
2038         erp_action->fsf_req = req;
2039
2040         zfcp_fsf_start_erp_timer(req);
2041         retval = zfcp_fsf_req_send(req);
2042         if (retval) {
2043                 zfcp_fsf_req_free(req);
2044                 erp_action->fsf_req = NULL;
2045         }
2046 out:
2047         spin_unlock_bh(&adapter->req_q_lock);
2048         return retval;
2049 }
2050
2051 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2052 {
2053         lat_rec->sum += lat;
2054         lat_rec->min = min(lat_rec->min, lat);
2055         lat_rec->max = max(lat_rec->max, lat);
2056 }
2057
2058 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2059 {
2060         struct fsf_qual_latency_info *lat_inf;
2061         struct latency_cont *lat;
2062         struct zfcp_unit *unit = req->unit;
2063
2064         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2065
2066         switch (req->qtcb->bottom.io.data_direction) {
2067         case FSF_DATADIR_READ:
2068                 lat = &unit->latencies.read;
2069                 break;
2070         case FSF_DATADIR_WRITE:
2071                 lat = &unit->latencies.write;
2072                 break;
2073         case FSF_DATADIR_CMND:
2074                 lat = &unit->latencies.cmd;
2075                 break;
2076         default:
2077                 return;
2078         }
2079
2080         spin_lock(&unit->latencies.lock);
2081         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2082         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2083         lat->counter++;
2084         spin_unlock(&unit->latencies.lock);
2085 }
2086
2087 #ifdef CONFIG_BLK_DEV_IO_TRACE
2088 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2089 {
2090         struct fsf_qual_latency_info *lat_inf;
2091         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2092         struct request *req = scsi_cmnd->request;
2093         struct zfcp_blk_drv_data trace;
2094         int ticks = fsf_req->adapter->timer_ticks;
2095
2096         trace.flags = 0;
2097         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2098         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2099                 trace.flags |= ZFCP_BLK_LAT_VALID;
2100                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2101                 trace.channel_lat = lat_inf->channel_lat * ticks;
2102                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2103         }
2104         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2105                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2106         trace.inb_usage = fsf_req->qdio_inb_usage;
2107         trace.outb_usage = fsf_req->qdio_outb_usage;
2108
2109         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2110 }
2111 #else
2112 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2113 {
2114 }
2115 #endif
2116
2117 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2118 {
2119         struct scsi_cmnd *scpnt;
2120         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2121             &(req->qtcb->bottom.io.fcp_rsp);
2122         u32 sns_len;
2123         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2124         unsigned long flags;
2125
2126         read_lock_irqsave(&req->adapter->abort_lock, flags);
2127
2128         scpnt = req->data;
2129         if (unlikely(!scpnt)) {
2130                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2131                 return;
2132         }
2133
2134         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2135                 set_host_byte(scpnt, DID_SOFT_ERROR);
2136                 goto skip_fsfstatus;
2137         }
2138
2139         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2140                 set_host_byte(scpnt, DID_ERROR);
2141                 goto skip_fsfstatus;
2142         }
2143
2144         set_msg_byte(scpnt, COMMAND_COMPLETE);
2145
2146         scpnt->result |= fcp_rsp_iu->scsi_status;
2147
2148         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2149                 zfcp_fsf_req_latency(req);
2150
2151         zfcp_fsf_trace_latency(req);
2152
2153         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2154                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2155                         set_host_byte(scpnt, DID_OK);
2156                 else {
2157                         set_host_byte(scpnt, DID_ERROR);
2158                         goto skip_fsfstatus;
2159                 }
2160         }
2161
2162         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2163                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2164                           fcp_rsp_iu->fcp_rsp_len;
2165                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2166                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2167
2168                 memcpy(scpnt->sense_buffer,
2169                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2170         }
2171
2172         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2173                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2174                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2175                     scpnt->underflow)
2176                         set_host_byte(scpnt, DID_ERROR);
2177         }
2178 skip_fsfstatus:
2179         if (scpnt->result != 0)
2180                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2181         else if (scpnt->retries > 0)
2182                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2183         else
2184                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2185
2186         scpnt->host_scribble = NULL;
2187         (scpnt->scsi_done) (scpnt);
2188         /*
2189          * We must hold this lock until scsi_done has been called.
2190          * Otherwise we may call scsi_done after abort regarding this
2191          * command has completed.
2192          * Note: scsi_done must not block!
2193          */
2194         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2195 }
2196
2197 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2198 {
2199         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2200             &(req->qtcb->bottom.io.fcp_rsp);
2201         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2202
2203         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2204              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2205                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2206 }
2207
2208
2209 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2210 {
2211         struct zfcp_unit *unit;
2212         struct fsf_qtcb_header *header = &req->qtcb->header;
2213
2214         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2215                 unit = req->data;
2216         else
2217                 unit = req->unit;
2218
2219         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2220                 goto skip_fsfstatus;
2221
2222         switch (header->fsf_status) {
2223         case FSF_HANDLE_MISMATCH:
2224         case FSF_PORT_HANDLE_NOT_VALID:
2225                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, req);
2226                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2227                 break;
2228         case FSF_FCPLUN_NOT_VALID:
2229         case FSF_LUN_HANDLE_NOT_VALID:
2230                 zfcp_erp_port_reopen(unit->port, 0, 113, req);
2231                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2232                 break;
2233         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2234                 zfcp_fsf_class_not_supp(req);
2235                 break;
2236         case FSF_ACCESS_DENIED:
2237                 zfcp_fsf_access_denied_unit(req, unit);
2238                 break;
2239         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2240                 dev_err(&req->adapter->ccw_device->dev,
2241                         "Incorrect direction %d, unit 0x%016Lx on port "
2242                         "0x%016Lx closed\n",
2243                         req->qtcb->bottom.io.data_direction,
2244                         (unsigned long long)unit->fcp_lun,
2245                         (unsigned long long)unit->port->wwpn);
2246                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, req);
2247                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2248                 break;
2249         case FSF_CMND_LENGTH_NOT_VALID:
2250                 dev_err(&req->adapter->ccw_device->dev,
2251                         "Incorrect CDB length %d, unit 0x%016Lx on "
2252                         "port 0x%016Lx closed\n",
2253                         req->qtcb->bottom.io.fcp_cmnd_length,
2254                         (unsigned long long)unit->fcp_lun,
2255                         (unsigned long long)unit->port->wwpn);
2256                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, req);
2257                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2258                 break;
2259         case FSF_PORT_BOXED:
2260                 zfcp_erp_port_boxed(unit->port, 53, req);
2261                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2262                                ZFCP_STATUS_FSFREQ_RETRY;
2263                 break;
2264         case FSF_LUN_BOXED:
2265                 zfcp_erp_unit_boxed(unit, 54, req);
2266                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2267                                ZFCP_STATUS_FSFREQ_RETRY;
2268                 break;
2269         case FSF_ADAPTER_STATUS_AVAILABLE:
2270                 if (header->fsf_status_qual.word[0] ==
2271                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2272                         zfcp_test_link(unit->port);
2273                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2274                 break;
2275         }
2276 skip_fsfstatus:
2277         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2278                 zfcp_fsf_send_fcp_ctm_handler(req);
2279         else {
2280                 zfcp_fsf_send_fcp_command_task_handler(req);
2281                 req->unit = NULL;
2282                 zfcp_unit_put(unit);
2283         }
2284 }
2285
2286 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2287 {
2288         u32 *fcp_dl_ptr;
2289
2290         /*
2291          * fcp_dl_addr = start address of fcp_cmnd structure +
2292          * size of fixed part + size of dynamically sized add_dcp_cdb field
2293          * SEE FCP-2 documentation
2294          */
2295         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2296                         (fcp_cmd->add_fcp_cdb_length << 2));
2297         *fcp_dl_ptr = fcp_dl;
2298 }
2299
2300 /**
2301  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2302  * @unit: unit where command is sent to
2303  * @scsi_cmnd: scsi command to be sent
2304  */
2305 int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
2306                                    struct scsi_cmnd *scsi_cmnd)
2307 {
2308         struct zfcp_fsf_req *req;
2309         struct fcp_cmnd_iu *fcp_cmnd_iu;
2310         unsigned int sbtype;
2311         int real_bytes, retval = -EIO;
2312         struct zfcp_adapter *adapter = unit->port->adapter;
2313
2314         if (unlikely(!(atomic_read(&unit->status) &
2315                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2316                 return -EBUSY;
2317
2318         spin_lock(&adapter->req_q_lock);
2319         if (atomic_read(&adapter->req_q.count) <= 0) {
2320                 atomic_inc(&adapter->qdio_outb_full);
2321                 goto out;
2322         }
2323         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND,
2324                                   ZFCP_REQ_AUTO_CLEANUP,
2325                                   adapter->pool.fsf_req_scsi);
2326         if (IS_ERR(req)) {
2327                 retval = PTR_ERR(req);
2328                 goto out;
2329         }
2330
2331         zfcp_unit_get(unit);
2332         req->unit = unit;
2333         req->data = scsi_cmnd;
2334         req->handler = zfcp_fsf_send_fcp_command_handler;
2335         req->qtcb->header.lun_handle = unit->handle;
2336         req->qtcb->header.port_handle = unit->port->handle;
2337         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2338
2339         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2340
2341         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2342         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2343         /*
2344          * set depending on data direction:
2345          *      data direction bits in SBALE (SB Type)
2346          *      data direction bits in QTCB
2347          *      data direction bits in FCP_CMND IU
2348          */
2349         switch (scsi_cmnd->sc_data_direction) {
2350         case DMA_NONE:
2351                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2352                 sbtype = SBAL_FLAGS0_TYPE_READ;
2353                 break;
2354         case DMA_FROM_DEVICE:
2355                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2356                 sbtype = SBAL_FLAGS0_TYPE_READ;
2357                 fcp_cmnd_iu->rddata = 1;
2358                 break;
2359         case DMA_TO_DEVICE:
2360                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2361                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2362                 fcp_cmnd_iu->wddata = 1;
2363                 break;
2364         case DMA_BIDIRECTIONAL:
2365         default:
2366                 retval = -EIO;
2367                 goto failed_scsi_cmnd;
2368         }
2369
2370         if (likely((scsi_cmnd->device->simple_tags) ||
2371                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2372                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2373                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2374         else
2375                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2376
2377         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2378                 fcp_cmnd_iu->add_fcp_cdb_length =
2379                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2380
2381         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2382
2383         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2384                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2385
2386         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2387                                              scsi_sglist(scsi_cmnd),
2388                                              FSF_MAX_SBALS_PER_REQ);
2389         if (unlikely(real_bytes < 0)) {
2390                 if (req->sbal_number < FSF_MAX_SBALS_PER_REQ)
2391                         retval = -EIO;
2392                 else {
2393                         dev_err(&adapter->ccw_device->dev,
2394                                 "Oversize data package, unit 0x%016Lx "
2395                                 "on port 0x%016Lx closed\n",
2396                                 (unsigned long long)unit->fcp_lun,
2397                                 (unsigned long long)unit->port->wwpn);
2398                         zfcp_erp_unit_shutdown(unit, 0, 131, req);
2399                         retval = -EINVAL;
2400                 }
2401                 goto failed_scsi_cmnd;
2402         }
2403
2404         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2405
2406         retval = zfcp_fsf_req_send(req);
2407         if (unlikely(retval))
2408                 goto failed_scsi_cmnd;
2409
2410         goto out;
2411
2412 failed_scsi_cmnd:
2413         zfcp_unit_put(unit);
2414         zfcp_fsf_req_free(req);
2415         scsi_cmnd->host_scribble = NULL;
2416 out:
2417         spin_unlock(&adapter->req_q_lock);
2418         return retval;
2419 }
2420
2421 /**
2422  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2423  * @unit: pointer to struct zfcp_unit
2424  * @tm_flags: unsigned byte for task management flags
2425  * Returns: on success pointer to struct fsf_req, NULL otherwise
2426  */
2427 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
2428 {
2429         struct qdio_buffer_element *sbale;
2430         struct zfcp_fsf_req *req = NULL;
2431         struct fcp_cmnd_iu *fcp_cmnd_iu;
2432         struct zfcp_adapter *adapter = unit->port->adapter;
2433
2434         if (unlikely(!(atomic_read(&unit->status) &
2435                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2436                 return NULL;
2437
2438         spin_lock_bh(&adapter->req_q_lock);
2439         if (zfcp_fsf_req_sbal_get(adapter))
2440                 goto out;
2441         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, 0,
2442                                   adapter->pool.fsf_req_scsi);
2443         if (IS_ERR(req)) {
2444                 req = NULL;
2445                 goto out;
2446         }
2447
2448         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2449         req->data = unit;
2450         req->handler = zfcp_fsf_send_fcp_command_handler;
2451         req->qtcb->header.lun_handle = unit->handle;
2452         req->qtcb->header.port_handle = unit->port->handle;
2453         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2454         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2455         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2456                                                 sizeof(u32);
2457
2458         sbale = zfcp_qdio_sbale_req(req);
2459         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2460         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2461
2462         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2463         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2464         fcp_cmnd_iu->task_management_flags = tm_flags;
2465
2466         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2467         if (!zfcp_fsf_req_send(req))
2468                 goto out;
2469
2470         zfcp_fsf_req_free(req);
2471         req = NULL;
2472 out:
2473         spin_unlock_bh(&adapter->req_q_lock);
2474         return req;
2475 }
2476
2477 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2478 {
2479         if (req->qtcb->header.fsf_status != FSF_GOOD)
2480                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2481 }
2482
2483 /**
2484  * zfcp_fsf_control_file - control file upload/download
2485  * @adapter: pointer to struct zfcp_adapter
2486  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2487  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2488  */
2489 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2490                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2491 {
2492         struct qdio_buffer_element *sbale;
2493         struct zfcp_fsf_req *req = NULL;
2494         struct fsf_qtcb_bottom_support *bottom;
2495         int direction, retval = -EIO, bytes;
2496
2497         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2498                 return ERR_PTR(-EOPNOTSUPP);
2499
2500         switch (fsf_cfdc->command) {
2501         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2502                 direction = SBAL_FLAGS0_TYPE_WRITE;
2503                 break;
2504         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2505                 direction = SBAL_FLAGS0_TYPE_READ;
2506                 break;
2507         default:
2508                 return ERR_PTR(-EINVAL);
2509         }
2510
2511         spin_lock_bh(&adapter->req_q_lock);
2512         if (zfcp_fsf_req_sbal_get(adapter))
2513                 goto out;
2514
2515         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2516         if (IS_ERR(req)) {
2517                 retval = -EPERM;
2518                 goto out;
2519         }
2520
2521         req->handler = zfcp_fsf_control_file_handler;
2522
2523         sbale = zfcp_qdio_sbale_req(req);
2524         sbale[0].flags |= direction;
2525
2526         bottom = &req->qtcb->bottom.support;
2527         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2528         bottom->option = fsf_cfdc->option;
2529
2530         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2531                                         FSF_MAX_SBALS_PER_REQ);
2532         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2533                 retval = -ENOMEM;
2534                 zfcp_fsf_req_free(req);
2535                 goto out;
2536         }
2537
2538         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2539         retval = zfcp_fsf_req_send(req);
2540 out:
2541         spin_unlock_bh(&adapter->req_q_lock);
2542
2543         if (!retval) {
2544                 wait_event(req->completion_wq,
2545                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2546                 return req;
2547         }
2548         return ERR_PTR(retval);
2549 }