drivers/s390/scsi/zfcp_fsf.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Implementation of FSF commands.
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   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,
  22                                 "fsrth_1", 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, "fspad_1", 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, "fsuad_1", 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, "fscns_1", 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                         zfcp_erp_port_reopen(port, 0, "fssrpc1", req);
 166                         return;
 167                 }
 168         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 169 }
 170
 171 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, char *id,
 172                                          struct fsf_link_down_info *link_down)
 173 {
 174         struct zfcp_adapter *adapter = req->adapter;
 175         unsigned long flags;
 176
 177         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 178                 return;
 179
 180         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 181
 182         read_lock_irqsave(&zfcp_data.config_lock, flags);
 183         zfcp_scsi_schedule_rports_block(adapter);
 184         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 185
 186         if (!link_down)
 187                 goto out;
 188
 189         switch (link_down->error_code) {
 190         case FSF_PSQ_LINK_NO_LIGHT:
 191                 dev_warn(&req->adapter->ccw_device->dev,
 192                          "There is no light signal from the local "
 193                          "fibre channel cable\n");
 194                 break;
 195         case FSF_PSQ_LINK_WRAP_PLUG:
 196                 dev_warn(&req->adapter->ccw_device->dev,
 197                          "There is a wrap plug instead of a fibre "
 198                          "channel cable\n");
 199                 break;
 200         case FSF_PSQ_LINK_NO_FCP:
 201                 dev_warn(&req->adapter->ccw_device->dev,
 202                          "The adjacent fibre channel node does not "
 203                          "support FCP\n");
 204                 break;
 205         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 206                 dev_warn(&req->adapter->ccw_device->dev,
 207                          "The FCP device is suspended because of a "
 208                          "firmware update\n");
 209                 break;
 210         case FSF_PSQ_LINK_INVALID_WWPN:
 211                 dev_warn(&req->adapter->ccw_device->dev,
 212                          "The FCP device detected a WWPN that is "
 213                          "duplicate or not valid\n");
 214                 break;
 215         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 216                 dev_warn(&req->adapter->ccw_device->dev,
 217                          "The fibre channel fabric does not support NPIV\n");
 218                 break;
 219         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 220                 dev_warn(&req->adapter->ccw_device->dev,
 221                          "The FCP adapter cannot support more NPIV ports\n");
 222                 break;
 223         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 224                 dev_warn(&req->adapter->ccw_device->dev,
 225                          "The adjacent switch cannot support "
 226                          "more NPIV ports\n");
 227                 break;
 228         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 229                 dev_warn(&req->adapter->ccw_device->dev,
 230                          "The FCP adapter could not log in to the "
 231                          "fibre channel fabric\n");
 232                 break;
 233         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 234                 dev_warn(&req->adapter->ccw_device->dev,
 235                          "The WWPN assignment file on the FCP adapter "
 236                          "has been damaged\n");
 237                 break;
 238         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 239                 dev_warn(&req->adapter->ccw_device->dev,
 240                          "The mode table on the FCP adapter "
 241                          "has been damaged\n");
 242                 break;
 243         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 244                 dev_warn(&req->adapter->ccw_device->dev,
 245                          "All NPIV ports on the FCP adapter have "
 246                          "been assigned\n");
 247                 break;
 248         default:
 249                 dev_warn(&req->adapter->ccw_device->dev,
 250                          "The link between the FCP adapter and "
 251                          "the FC fabric is down\n");
 252         }
 253 out:
 254         zfcp_erp_adapter_failed(adapter, id, req);
 255 }
 256
 257 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 258 {
 259         struct fsf_status_read_buffer *sr_buf = req->data;
 260         struct fsf_link_down_info *ldi =
 261                 (struct fsf_link_down_info *) &sr_buf->payload;
 262
 263         switch (sr_buf->status_subtype) {
 264         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 265                 zfcp_fsf_link_down_info_eval(req, "fssrld1", ldi);
 266                 break;
 267         case FSF_STATUS_READ_SUB_FDISC_FAILED:
 268                 zfcp_fsf_link_down_info_eval(req, "fssrld2", ldi);
 269                 break;
 270         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 271                 zfcp_fsf_link_down_info_eval(req, "fssrld3", NULL);
 272         };
 273 }
 274
 275 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 276 {
 277         struct zfcp_adapter *adapter = req->adapter;
 278         struct fsf_status_read_buffer *sr_buf = req->data;
 279
 280         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 281                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, sr_buf);
 282                 mempool_free(sr_buf, adapter->pool.data_status_read);
 283                 zfcp_fsf_req_free(req);
 284                 return;
 285         }
 286
 287         zfcp_hba_dbf_event_fsf_unsol("read", adapter, sr_buf);
 288
 289         switch (sr_buf->status_type) {
 290         case FSF_STATUS_READ_PORT_CLOSED:
 291                 zfcp_fsf_status_read_port_closed(req);
 292                 break;
 293         case FSF_STATUS_READ_INCOMING_ELS:
 294                 zfcp_fc_incoming_els(req);
 295                 break;
 296         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 297                 break;
 298         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 299                 dev_warn(&adapter->ccw_device->dev,
 300                          "The error threshold for checksum statistics "
 301                          "has been exceeded\n");
 302                 zfcp_hba_dbf_event_berr(adapter, req);
 303                 break;
 304         case FSF_STATUS_READ_LINK_DOWN:
 305                 zfcp_fsf_status_read_link_down(req);
 306                 break;
 307         case FSF_STATUS_READ_LINK_UP:
 308                 dev_info(&adapter->ccw_device->dev,
 309                          "The local link has been restored\n");
 310                 /* All ports should be marked as ready to run again */
 311                 zfcp_erp_modify_adapter_status(adapter, "fssrh_1", NULL,
 312                                                ZFCP_STATUS_COMMON_RUNNING,
 313                                                ZFCP_SET);
 314                 zfcp_erp_adapter_reopen(adapter,
 315                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 316                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 317                                         "fssrh_2", req);
 318                 break;
 319         case FSF_STATUS_READ_NOTIFICATION_LOST:
 320                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
 321                         zfcp_erp_adapter_access_changed(adapter, "fssrh_3",
 322                                                         req);
 323                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
 324                         schedule_work(&adapter->scan_work);
 325                 break;
 326         case FSF_STATUS_READ_CFDC_UPDATED:
 327                 zfcp_erp_adapter_access_changed(adapter, "fssrh_4", req);
 328                 break;
 329         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 330                 adapter->adapter_features = sr_buf->payload.word[0];
 331                 break;
 332         }
 333
 334         mempool_free(sr_buf, adapter->pool.data_status_read);
 335         zfcp_fsf_req_free(req);
 336
 337         atomic_inc(&adapter->stat_miss);
 338         queue_work(zfcp_data.work_queue, &adapter->stat_work);
 339 }
 340
 341 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 342 {
 343         switch (req->qtcb->header.fsf_status_qual.word[0]) {
 344         case FSF_SQ_FCP_RSP_AVAILABLE:
 345         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 346         case FSF_SQ_NO_RETRY_POSSIBLE:
 347         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 348                 return;
 349         case FSF_SQ_COMMAND_ABORTED:
 350                 req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 351                 break;
 352         case FSF_SQ_NO_RECOM:
 353                 dev_err(&req->adapter->ccw_device->dev,
 354                         "The FCP adapter reported a problem "
 355                         "that cannot be recovered\n");
 356                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfsqe1", req);
 357                 break;
 358         }
 359         /* all non-return stats set FSFREQ_ERROR*/
 360         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 361 }
 362
 363 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 364 {
 365         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 366                 return;
 367
 368         switch (req->qtcb->header.fsf_status) {
 369         case FSF_UNKNOWN_COMMAND:
 370                 dev_err(&req->adapter->ccw_device->dev,
 371                         "The FCP adapter does not recognize the command 0x%x\n",
 372                         req->qtcb->header.fsf_command);
 373                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfse_1", req);
 374                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 375                 break;
 376         case FSF_ADAPTER_STATUS_AVAILABLE:
 377                 zfcp_fsf_fsfstatus_qual_eval(req);
 378                 break;
 379         }
 380 }
 381
 382 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 383 {
 384         struct zfcp_adapter *adapter = req->adapter;
 385         struct fsf_qtcb *qtcb = req->qtcb;
 386         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 387
 388         zfcp_hba_dbf_event_fsf_response(req);
 389
 390         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 391                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 392                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 393                 return;
 394         }
 395
 396         switch (qtcb->prefix.prot_status) {
 397         case FSF_PROT_GOOD:
 398         case FSF_PROT_FSF_STATUS_PRESENTED:
 399                 return;
 400         case FSF_PROT_QTCB_VERSION_ERROR:
 401                 dev_err(&adapter->ccw_device->dev,
 402                         "QTCB version 0x%x not supported by FCP adapter "
 403                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
 404                         psq->word[0], psq->word[1]);
 405                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_1", req);
 406                 break;
 407         case FSF_PROT_ERROR_STATE:
 408         case FSF_PROT_SEQ_NUMB_ERROR:
 409                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_2", req);
 410                 req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 411                 break;
 412         case FSF_PROT_UNSUPP_QTCB_TYPE:
 413                 dev_err(&adapter->ccw_device->dev,
 414                         "The QTCB type is not supported by the FCP adapter\n");
 415                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_3", req);
 416                 break;
 417         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 418                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 419                                 &adapter->status);
 420                 break;
 421         case FSF_PROT_DUPLICATE_REQUEST_ID:
 422                 dev_err(&adapter->ccw_device->dev,
 423                         "0x%Lx is an ambiguous request identifier\n",
 424                         (unsigned long long)qtcb->bottom.support.req_handle);
 425                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_4", req);
 426                 break;
 427         case FSF_PROT_LINK_DOWN:
 428                 zfcp_fsf_link_down_info_eval(req, "fspse_5",
 429                                              &psq->link_down_info);
 430                 /* FIXME: reopening adapter now? better wait for link up */
 431                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_6", 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, "fspse_7", 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,
 441                                         "fspse_8", req);
 442                 break;
 443         default:
 444                 dev_err(&adapter->ccw_device->dev,
 445                         "0x%x is not a valid transfer protocol status\n",
 446                         qtcb->prefix.prot_status);
 447                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_9", req);
 448         }
 449         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 450 }
 451
 452 /**
 453  * zfcp_fsf_req_complete - process completion of a FSF request
 454  * @fsf_req: The FSF request that has been completed.
 455  *
 456  * When a request has been completed either from the FCP adapter,
 457  * or it has been dismissed due to a queue shutdown, this function
 458  * is called to process the completion status and trigger further
 459  * events related to the FSF request.
 460  */
 461 void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 462 {
 463         if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 464                 zfcp_fsf_status_read_handler(req);
 465                 return;
 466         }
 467
 468         del_timer(&req->timer);
 469         zfcp_fsf_protstatus_eval(req);
 470         zfcp_fsf_fsfstatus_eval(req);
 471         req->handler(req);
 472
 473         if (req->erp_action)
 474                 zfcp_erp_notify(req->erp_action, 0);
 475         req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 476
 477         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 478                 zfcp_fsf_req_free(req);
 479         else
 480         /* notify initiator waiting for the requests completion */
 481         /*
 482          * FIXME: Race! We must not access fsf_req here as it might have been
 483          * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 484          * flag. It's an improbable case. But, we have the same paranoia for
 485          * the cleanup flag already.
 486          * Might better be handled using complete()?
 487          * (setting the flag and doing wakeup ought to be atomic
 488          *  with regard to checking the flag as long as waitqueue is
 489          *  part of the to be released structure)
 490          */
 491                 wake_up(&req->completion_wq);
 492 }
 493
 494 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 495 {
 496         struct fsf_qtcb_bottom_config *bottom;
 497         struct zfcp_adapter *adapter = req->adapter;
 498         struct Scsi_Host *shost = adapter->scsi_host;
 499
 500         bottom = &req->qtcb->bottom.config;
 501
 502         if (req->data)
 503                 memcpy(req->data, bottom, sizeof(*bottom));
 504
 505         fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
 506         fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
 507         fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
 508         fc_host_speed(shost) = bottom->fc_link_speed;
 509         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 510
 511         adapter->hydra_version = bottom->adapter_type;
 512         adapter->timer_ticks = bottom->timer_interval;
 513
 514         if (fc_host_permanent_port_name(shost) == -1)
 515                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 516
 517         switch (bottom->fc_topology) {
 518         case FSF_TOPO_P2P:
 519                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
 520                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
 521                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
 522                 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
 523                 break;
 524         case FSF_TOPO_FABRIC:
 525                 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
 526                 break;
 527         case FSF_TOPO_AL:
 528                 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
 529                 /* fall through */
 530         default:
 531                 dev_err(&adapter->ccw_device->dev,
 532                         "Unknown or unsupported arbitrated loop "
 533                         "fibre channel topology detected\n");
 534                 zfcp_erp_adapter_shutdown(adapter, 0, "fsece_1", req);
 535                 return -EIO;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 542 {
 543         struct zfcp_adapter *adapter = req->adapter;
 544         struct fsf_qtcb *qtcb = req->qtcb;
 545         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 546         struct Scsi_Host *shost = adapter->scsi_host;
 547
 548         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 549                 return;
 550
 551         adapter->fsf_lic_version = bottom->lic_version;
 552         adapter->adapter_features = bottom->adapter_features;
 553         adapter->connection_features = bottom->connection_features;
 554         adapter->peer_wwpn = 0;
 555         adapter->peer_wwnn = 0;
 556         adapter->peer_d_id = 0;
 557
 558         switch (qtcb->header.fsf_status) {
 559         case FSF_GOOD:
 560                 if (zfcp_fsf_exchange_config_evaluate(req))
 561                         return;
 562
 563                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 564                         dev_err(&adapter->ccw_device->dev,
 565                                 "FCP adapter maximum QTCB size (%d bytes) "
 566                                 "is too small\n",
 567                                 bottom->max_qtcb_size);
 568                         zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh1", req);
 569                         return;
 570                 }
 571                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 572                                 &adapter->status);
 573                 break;
 574         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 575                 fc_host_node_name(shost) = 0;
 576                 fc_host_port_name(shost) = 0;
 577                 fc_host_port_id(shost) = 0;
 578                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 579                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 580                 adapter->hydra_version = 0;
 581
 582                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 583                                 &adapter->status);
 584
 585                 zfcp_fsf_link_down_info_eval(req, "fsecdh2",
 586                         &qtcb->header.fsf_status_qual.link_down_info);
 587                 break;
 588         default:
 589                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh3", req);
 590                 return;
 591         }
 592
 593         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 594                 adapter->hardware_version = bottom->hardware_version;
 595                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
 596                        min(FC_SERIAL_NUMBER_SIZE, 17));
 597                 EBCASC(fc_host_serial_number(shost),
 598                        min(FC_SERIAL_NUMBER_SIZE, 17));
 599         }
 600
 601         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 602                 dev_err(&adapter->ccw_device->dev,
 603                         "The FCP adapter only supports newer "
 604                         "control block versions\n");
 605                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh4", req);
 606                 return;
 607         }
 608         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 609                 dev_err(&adapter->ccw_device->dev,
 610                         "The FCP adapter only supports older "
 611                         "control block versions\n");
 612                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh5", req);
 613         }
 614 }
 615
 616 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 617 {
 618         struct zfcp_adapter *adapter = req->adapter;
 619         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 620         struct Scsi_Host *shost = adapter->scsi_host;
 621
 622         if (req->data)
 623                 memcpy(req->data, bottom, sizeof(*bottom));
 624
 625         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) {
 626                 fc_host_permanent_port_name(shost) = bottom->wwpn;
 627                 fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
 628         } else
 629                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 630         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 631         fc_host_supported_speeds(shost) = bottom->supported_speed;
 632 }
 633
 634 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 635 {
 636         struct fsf_qtcb *qtcb = req->qtcb;
 637
 638         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 639                 return;
 640
 641         switch (qtcb->header.fsf_status) {
 642         case FSF_GOOD:
 643                 zfcp_fsf_exchange_port_evaluate(req);
 644                 break;
 645         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 646                 zfcp_fsf_exchange_port_evaluate(req);
 647                 zfcp_fsf_link_down_info_eval(req, "fsepdh1",
 648                         &qtcb->header.fsf_status_qual.link_down_info);
 649                 break;
 650         }
 651 }
 652
 653 static int zfcp_fsf_sbal_check(struct zfcp_adapter *adapter)
 654 {
 655         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 656
 657         spin_lock_bh(&adapter->req_q_lock);
 658         if (atomic_read(&req_q->count))
 659                 return 1;
 660         spin_unlock_bh(&adapter->req_q_lock);
 661         return 0;
 662 }
 663
 664 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 665 {
 666         long ret;
 667
 668         spin_unlock_bh(&adapter->req_q_lock);
 669         ret = wait_event_interruptible_timeout(adapter->request_wq,
 670                                zfcp_fsf_sbal_check(adapter), 5 * HZ);
 671         if (ret > 0)
 672                 return 0;
 673         if (!ret)
 674                 atomic_inc(&adapter->qdio_outb_full);
 675
 676         spin_lock_bh(&adapter->req_q_lock);
 677         return -EIO;
 678 }
 679
 680 static struct zfcp_fsf_req *zfcp_fsf_alloc_noqtcb(mempool_t *pool)
 681 {
 682         struct zfcp_fsf_req *req;
 683         req = mempool_alloc(pool, GFP_ATOMIC);
 684         if (!req)
 685                 return NULL;
 686         memset(req, 0, sizeof(*req));
 687         req->pool = pool;
 688         return req;
 689 }
 690
 691 static struct zfcp_fsf_req *zfcp_fsf_alloc_qtcb(mempool_t *pool)
 692 {
 693         struct zfcp_fsf_req_qtcb *qtcb;
 694
 695         if (likely(pool))
 696                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
 697         else
 698                 qtcb = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 699                                         GFP_ATOMIC);
 700         if (unlikely(!qtcb))
 701                 return NULL;
 702
 703         memset(qtcb, 0, sizeof(*qtcb));
 704         qtcb->fsf_req.qtcb = &qtcb->qtcb;
 705         qtcb->fsf_req.pool = pool;
 706
 707         return &qtcb->fsf_req;
 708 }
 709
 710 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
 711                                                 u32 fsf_cmd, int req_flags,
 712                                                 mempool_t *pool)
 713 {
 714         struct qdio_buffer_element *sbale;
 715
 716         struct zfcp_fsf_req *req;
 717         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 718
 719         if (req_flags & ZFCP_REQ_NO_QTCB)
 720                 req = zfcp_fsf_alloc_noqtcb(pool);
 721         else
 722                 req = zfcp_fsf_alloc_qtcb(pool);
 723
 724         if (unlikely(!req))
 725                 return ERR_PTR(-EIO);
 726
 727         if (adapter->req_no == 0)
 728                 adapter->req_no++;
 729
 730         INIT_LIST_HEAD(&req->list);
 731         init_timer(&req->timer);
 732         init_waitqueue_head(&req->completion_wq);
 733
 734         req->adapter = adapter;
 735         req->fsf_command = fsf_cmd;
 736         req->req_id = adapter->req_no;
 737         req->sbal_number = 1;
 738         req->sbal_first = req_q->first;
 739         req->sbal_last = req_q->first;
 740         req->sbale_curr = 1;
 741
 742         sbale = zfcp_qdio_sbale_req(req);
 743         sbale[0].addr = (void *) req->req_id;
 744         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 745
 746         if (likely(req->qtcb)) {
 747                 req->qtcb->prefix.req_seq_no = req->adapter->fsf_req_seq_no;
 748                 req->qtcb->prefix.req_id = req->req_id;
 749                 req->qtcb->prefix.ulp_info = 26;
 750                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command];
 751                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
 752                 req->qtcb->header.req_handle = req->req_id;
 753                 req->qtcb->header.fsf_command = req->fsf_command;
 754                 req->seq_no = adapter->fsf_req_seq_no;
 755                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 756                 sbale[1].addr = (void *) req->qtcb;
 757                 sbale[1].length = sizeof(struct fsf_qtcb);
 758         }
 759
 760         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) {
 761                 zfcp_fsf_req_free(req);
 762                 return ERR_PTR(-EIO);
 763         }
 764
 765         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP))
 766                 req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
 767
 768         return req;
 769 }
 770
 771 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 772 {
 773         struct zfcp_adapter *adapter = req->adapter;
 774         unsigned long        flags;
 775         int                  idx;
 776         int                  with_qtcb = (req->qtcb != NULL);
 777
 778         /* put allocated FSF request into hash table */
 779         spin_lock_irqsave(&adapter->req_list_lock, flags);
 780         idx = zfcp_reqlist_hash(req->req_id);
 781         list_add_tail(&req->list, &adapter->req_list[idx]);
 782         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 783
 784         req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
 785         req->issued = get_clock();
 786         if (zfcp_qdio_send(req)) {
 787                 del_timer(&req->timer);
 788                 spin_lock_irqsave(&adapter->req_list_lock, flags);
 789                 /* lookup request again, list might have changed */
 790                 if (zfcp_reqlist_find_safe(adapter, req))
 791                         zfcp_reqlist_remove(adapter, req);
 792                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 793                 zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1", req);
 794                 return -EIO;
 795         }
 796
 797         /* Don't increase for unsolicited status */
 798         if (with_qtcb)
 799                 adapter->fsf_req_seq_no++;
 800         adapter->req_no++;
 801
 802         return 0;
 803 }
 804
 805 /**
 806  * zfcp_fsf_status_read - send status read request
 807  * @adapter: pointer to struct zfcp_adapter
 808  * @req_flags: request flags
 809  * Returns: 0 on success, ERROR otherwise
 810  */
 811 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 812 {
 813         struct zfcp_fsf_req *req;
 814         struct fsf_status_read_buffer *sr_buf;
 815         struct qdio_buffer_element *sbale;
 816         int retval = -EIO;
 817
 818         spin_lock_bh(&adapter->req_q_lock);
 819         if (zfcp_fsf_req_sbal_get(adapter))
 820                 goto out;
 821
 822         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 823                                   ZFCP_REQ_NO_QTCB,
 824                                   adapter->pool.fsf_req_status_read);
 825         if (IS_ERR(req)) {
 826                 retval = PTR_ERR(req);
 827                 goto out;
 828         }
 829
 830         sbale = zfcp_qdio_sbale_req(req);
 831         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 832         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 833         req->sbale_curr = 2;
 834
 835         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 836         if (!sr_buf) {
 837                 retval = -ENOMEM;
 838                 goto failed_buf;
 839         }
 840         memset(sr_buf, 0, sizeof(*sr_buf));
 841         req->data = sr_buf;
 842         sbale = zfcp_qdio_sbale_curr(req);
 843         sbale->addr = (void *) sr_buf;
 844         sbale->length = sizeof(*sr_buf);
 845
 846         retval = zfcp_fsf_req_send(req);
 847         if (retval)
 848                 goto failed_req_send;
 849
 850         goto out;
 851
 852 failed_req_send:
 853         mempool_free(sr_buf, adapter->pool.data_status_read);
 854 failed_buf:
 855         zfcp_fsf_req_free(req);
 856         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 857 out:
 858         spin_unlock_bh(&adapter->req_q_lock);
 859         return retval;
 860 }
 861
 862 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 863 {
 864         struct zfcp_unit *unit = req->data;
 865         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 866
 867         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 868                 return;
 869
 870         switch (req->qtcb->header.fsf_status) {
 871         case FSF_PORT_HANDLE_NOT_VALID:
 872                 if (fsq->word[0] == fsq->word[1]) {
 873                         zfcp_erp_adapter_reopen(unit->port->adapter, 0,
 874                                                 "fsafch1", req);
 875                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 876                 }
 877                 break;
 878         case FSF_LUN_HANDLE_NOT_VALID:
 879                 if (fsq->word[0] == fsq->word[1]) {
 880                         zfcp_erp_port_reopen(unit->port, 0, "fsafch2", req);
 881                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 882                 }
 883                 break;
 884         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 885                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 886                 break;
 887         case FSF_PORT_BOXED:
 888                 zfcp_erp_port_boxed(unit->port, "fsafch3", req);
 889                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 890                                ZFCP_STATUS_FSFREQ_RETRY;
 891                 break;
 892         case FSF_LUN_BOXED:
 893                 zfcp_erp_unit_boxed(unit, "fsafch4", req);
 894                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 895                                ZFCP_STATUS_FSFREQ_RETRY;
 896                 break;
 897         case FSF_ADAPTER_STATUS_AVAILABLE:
 898                 switch (fsq->word[0]) {
 899                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 900                         zfcp_test_link(unit->port);
 901                         /* fall through */
 902                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 903                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 904                         break;
 905                 }
 906                 break;
 907         case FSF_GOOD:
 908                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 909                 break;
 910         }
 911 }
 912
 913 /**
 914  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 915  * @old_req_id: unsigned long
 916  * @unit: pointer to struct zfcp_unit
 917  * Returns: pointer to struct zfcp_fsf_req
 918  */
 919
 920 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 921                                                 struct zfcp_unit *unit)
 922 {
 923         struct qdio_buffer_element *sbale;
 924         struct zfcp_fsf_req *req = NULL;
 925         struct zfcp_adapter *adapter = unit->port->adapter;
 926
 927         spin_lock_bh(&adapter->req_q_lock);
 928         if (zfcp_fsf_req_sbal_get(adapter))
 929                 goto out;
 930         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 931                                   0, adapter->pool.fsf_req_abort);
 932         if (IS_ERR(req)) {
 933                 req = NULL;
 934                 goto out;
 935         }
 936
 937         if (unlikely(!(atomic_read(&unit->status) &
 938                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 939                 goto out_error_free;
 940
 941         sbale = zfcp_qdio_sbale_req(req);
 942         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 943         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 944
 945         req->data = unit;
 946         req->handler = zfcp_fsf_abort_fcp_command_handler;
 947         req->qtcb->header.lun_handle = unit->handle;
 948         req->qtcb->header.port_handle = unit->port->handle;
 949         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 950
 951         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 952         if (!zfcp_fsf_req_send(req))
 953                 goto out;
 954
 955 out_error_free:
 956         zfcp_fsf_req_free(req);
 957         req = NULL;
 958 out:
 959         spin_unlock_bh(&adapter->req_q_lock);
 960         return req;
 961 }
 962
 963 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 964 {
 965         struct zfcp_adapter *adapter = req->adapter;
 966         struct zfcp_send_ct *send_ct = req->data;
 967         struct fsf_qtcb_header *header = &req->qtcb->header;
 968
 969         send_ct->status = -EINVAL;
 970
 971         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 972                 goto skip_fsfstatus;
 973
 974         switch (header->fsf_status) {
 975         case FSF_GOOD:
 976                 zfcp_san_dbf_event_ct_response(req);
 977                 send_ct->status = 0;
 978                 break;
 979         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 980                 zfcp_fsf_class_not_supp(req);
 981                 break;
 982         case FSF_ADAPTER_STATUS_AVAILABLE:
 983                 switch (header->fsf_status_qual.word[0]){
 984                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 985                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 986                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 987                         break;
 988                 }
 989                 break;
 990         case FSF_ACCESS_DENIED:
 991                 break;
 992         case FSF_PORT_BOXED:
 993                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 994                                ZFCP_STATUS_FSFREQ_RETRY;
 995                 break;
 996         case FSF_PORT_HANDLE_NOT_VALID:
 997                 zfcp_erp_adapter_reopen(adapter, 0, "fsscth1", req);
 998                 /* fall through */
 999         case FSF_GENERIC_COMMAND_REJECTED:
1000         case FSF_PAYLOAD_SIZE_MISMATCH:
1001         case FSF_REQUEST_SIZE_TOO_LARGE:
1002         case FSF_RESPONSE_SIZE_TOO_LARGE:
1003         case FSF_SBAL_MISMATCH:
1004                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1005                 break;
1006         }
1007
1008 skip_fsfstatus:
1009         if (send_ct->handler)
1010                 send_ct->handler(send_ct->handler_data);
1011 }
1012
1013 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1014                                        struct scatterlist *sg_req,
1015                                        struct scatterlist *sg_resp,
1016                                        int max_sbals)
1017 {
1018         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(req);
1019         u32 feat = req->adapter->adapter_features;
1020         int bytes;
1021
1022         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1023                 if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
1024                     !sg_is_last(sg_req) || !sg_is_last(sg_resp))
1025                         return -EOPNOTSUPP;
1026
1027                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1028                 sbale[2].addr   = sg_virt(sg_req);
1029                 sbale[2].length = sg_req->length;
1030                 sbale[3].addr   = sg_virt(sg_resp);
1031                 sbale[3].length = sg_resp->length;
1032                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1033                 return 0;
1034         }
1035
1036         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1037                                         sg_req, max_sbals);
1038         if (bytes <= 0)
1039                 return -ENOMEM;
1040         req->qtcb->bottom.support.req_buf_length = bytes;
1041         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1042
1043         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1044                                         sg_resp, max_sbals);
1045         if (bytes <= 0)
1046                 return -ENOMEM;
1047         req->qtcb->bottom.support.resp_buf_length = bytes;
1048
1049         return 0;
1050 }
1051
1052 /**
1053  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1054  * @ct: pointer to struct zfcp_send_ct with data for request
1055  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1056  * @erp_action: if non-null the Generic Service request sent within ERP
1057  */
1058 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1059                      struct zfcp_erp_action *erp_action)
1060 {
1061         struct zfcp_wka_port *wka_port = ct->wka_port;
1062         struct zfcp_adapter *adapter = wka_port->adapter;
1063         struct zfcp_fsf_req *req;
1064         int ret = -EIO;
1065
1066         spin_lock_bh(&adapter->req_q_lock);
1067         if (zfcp_fsf_req_sbal_get(adapter))
1068                 goto out;
1069
1070         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1071                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1072         if (IS_ERR(req)) {
1073                 ret = PTR_ERR(req);
1074                 goto out;
1075         }
1076
1077         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1078                                           FSF_MAX_SBALS_PER_REQ);
1079         if (ret)
1080                 goto failed_send;
1081
1082         req->handler = zfcp_fsf_send_ct_handler;
1083         req->qtcb->header.port_handle = wka_port->handle;
1084         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1085         req->qtcb->bottom.support.timeout = ct->timeout;
1086         req->data = ct;
1087
1088         zfcp_san_dbf_event_ct_request(req);
1089
1090         if (erp_action) {
1091                 erp_action->fsf_req = req;
1092                 req->erp_action = erp_action;
1093                 zfcp_fsf_start_erp_timer(req);
1094         } else
1095                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1096
1097         ret = zfcp_fsf_req_send(req);
1098         if (ret)
1099                 goto failed_send;
1100
1101         goto out;
1102
1103 failed_send:
1104         zfcp_fsf_req_free(req);
1105         if (erp_action)
1106                 erp_action->fsf_req = NULL;
1107 out:
1108         spin_unlock_bh(&adapter->req_q_lock);
1109         return ret;
1110 }
1111
1112 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1113 {
1114         struct zfcp_send_els *send_els = req->data;
1115         struct zfcp_port *port = send_els->port;
1116         struct fsf_qtcb_header *header = &req->qtcb->header;
1117
1118         send_els->status = -EINVAL;
1119
1120         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1121                 goto skip_fsfstatus;
1122
1123         switch (header->fsf_status) {
1124         case FSF_GOOD:
1125                 zfcp_san_dbf_event_els_response(req);
1126                 send_els->status = 0;
1127                 break;
1128         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1129                 zfcp_fsf_class_not_supp(req);
1130                 break;
1131         case FSF_ADAPTER_STATUS_AVAILABLE:
1132                 switch (header->fsf_status_qual.word[0]){
1133                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1134                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1135                                 zfcp_test_link(port);
1136                         /*fall through */
1137                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1138                 case FSF_SQ_RETRY_IF_POSSIBLE:
1139                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1140                         break;
1141                 }
1142                 break;
1143         case FSF_ELS_COMMAND_REJECTED:
1144         case FSF_PAYLOAD_SIZE_MISMATCH:
1145         case FSF_REQUEST_SIZE_TOO_LARGE:
1146         case FSF_RESPONSE_SIZE_TOO_LARGE:
1147                 break;
1148         case FSF_ACCESS_DENIED:
1149                 if (port)
1150                         zfcp_fsf_access_denied_port(req, port);
1151                 break;
1152         case FSF_SBAL_MISMATCH:
1153                 /* should never occure, avoided in zfcp_fsf_send_els */
1154                 /* fall through */
1155         default:
1156                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1157                 break;
1158         }
1159 skip_fsfstatus:
1160         if (send_els->handler)
1161                 send_els->handler(send_els->handler_data);
1162 }
1163
1164 /**
1165  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1166  * @els: pointer to struct zfcp_send_els with data for the command
1167  */
1168 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1169 {
1170         struct zfcp_fsf_req *req;
1171         struct zfcp_adapter *adapter = els->adapter;
1172         struct fsf_qtcb_bottom_support *bottom;
1173         int ret = -EIO;
1174
1175         spin_lock_bh(&adapter->req_q_lock);
1176         if (zfcp_fsf_req_sbal_get(adapter))
1177                 goto out;
1178         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1179                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1180         if (IS_ERR(req)) {
1181                 ret = PTR_ERR(req);
1182                 goto out;
1183         }
1184
1185         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1186
1187         if (ret)
1188                 goto failed_send;
1189
1190         bottom = &req->qtcb->bottom.support;
1191         req->handler = zfcp_fsf_send_els_handler;
1192         bottom->d_id = els->d_id;
1193         bottom->service_class = FSF_CLASS_3;
1194         bottom->timeout = 2 * R_A_TOV;
1195         req->data = els;
1196
1197         zfcp_san_dbf_event_els_request(req);
1198
1199         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1200         ret = zfcp_fsf_req_send(req);
1201         if (ret)
1202                 goto failed_send;
1203
1204         goto out;
1205
1206 failed_send:
1207         zfcp_fsf_req_free(req);
1208 out:
1209         spin_unlock_bh(&adapter->req_q_lock);
1210         return ret;
1211 }
1212
1213 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1214 {
1215         struct qdio_buffer_element *sbale;
1216         struct zfcp_fsf_req *req;
1217         struct zfcp_adapter *adapter = erp_action->adapter;
1218         int retval = -EIO;
1219
1220         spin_lock_bh(&adapter->req_q_lock);
1221         if (zfcp_fsf_req_sbal_get(adapter))
1222                 goto out;
1223         req = zfcp_fsf_req_create(adapter,
1224                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1225                                   ZFCP_REQ_AUTO_CLEANUP,
1226                                   adapter->pool.fsf_req_erp);
1227         if (IS_ERR(req)) {
1228                 retval = PTR_ERR(req);
1229                 goto out;
1230         }
1231
1232         sbale = zfcp_qdio_sbale_req(req);
1233         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1234         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1235
1236         req->qtcb->bottom.config.feature_selection =
1237                         FSF_FEATURE_CFDC |
1238                         FSF_FEATURE_LUN_SHARING |
1239                         FSF_FEATURE_NOTIFICATION_LOST |
1240                         FSF_FEATURE_UPDATE_ALERT;
1241         req->erp_action = erp_action;
1242         req->handler = zfcp_fsf_exchange_config_data_handler;
1243         erp_action->fsf_req = req;
1244
1245         zfcp_fsf_start_erp_timer(req);
1246         retval = zfcp_fsf_req_send(req);
1247         if (retval) {
1248                 zfcp_fsf_req_free(req);
1249                 erp_action->fsf_req = NULL;
1250         }
1251 out:
1252         spin_unlock_bh(&adapter->req_q_lock);
1253         return retval;
1254 }
1255
1256 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1257                                        struct fsf_qtcb_bottom_config *data)
1258 {
1259         struct qdio_buffer_element *sbale;
1260         struct zfcp_fsf_req *req = NULL;
1261         int retval = -EIO;
1262
1263         spin_lock_bh(&adapter->req_q_lock);
1264         if (zfcp_fsf_req_sbal_get(adapter))
1265                 goto out_unlock;
1266
1267         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1268                                   0, NULL);
1269         if (IS_ERR(req)) {
1270                 retval = PTR_ERR(req);
1271                 goto out_unlock;
1272         }
1273
1274         sbale = zfcp_qdio_sbale_req(req);
1275         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1276         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1277         req->handler = zfcp_fsf_exchange_config_data_handler;
1278
1279         req->qtcb->bottom.config.feature_selection =
1280                         FSF_FEATURE_CFDC |
1281                         FSF_FEATURE_LUN_SHARING |
1282                         FSF_FEATURE_NOTIFICATION_LOST |
1283                         FSF_FEATURE_UPDATE_ALERT;
1284
1285         if (data)
1286                 req->data = data;
1287
1288         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1289         retval = zfcp_fsf_req_send(req);
1290         spin_unlock_bh(&adapter->req_q_lock);
1291         if (!retval)
1292                 wait_event(req->completion_wq,
1293                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1294
1295         zfcp_fsf_req_free(req);
1296         return retval;
1297
1298 out_unlock:
1299         spin_unlock_bh(&adapter->req_q_lock);
1300         return retval;
1301 }
1302
1303 /**
1304  * zfcp_fsf_exchange_port_data - request information about local port
1305  * @erp_action: ERP action for the adapter for which port data is requested
1306  * Returns: 0 on success, error otherwise
1307  */
1308 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1309 {
1310         struct qdio_buffer_element *sbale;
1311         struct zfcp_fsf_req *req;
1312         struct zfcp_adapter *adapter = erp_action->adapter;
1313         int retval = -EIO;
1314
1315         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1316                 return -EOPNOTSUPP;
1317
1318         spin_lock_bh(&adapter->req_q_lock);
1319         if (zfcp_fsf_req_sbal_get(adapter))
1320                 goto out;
1321         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1322                                   ZFCP_REQ_AUTO_CLEANUP,
1323                                   adapter->pool.fsf_req_erp);
1324         if (IS_ERR(req)) {
1325                 retval = PTR_ERR(req);
1326                 goto out;
1327         }
1328
1329         sbale = zfcp_qdio_sbale_req(req);
1330         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1331         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1332
1333         req->handler = zfcp_fsf_exchange_port_data_handler;
1334         req->erp_action = erp_action;
1335         erp_action->fsf_req = req;
1336
1337         zfcp_fsf_start_erp_timer(req);
1338         retval = zfcp_fsf_req_send(req);
1339         if (retval) {
1340                 zfcp_fsf_req_free(req);
1341                 erp_action->fsf_req = NULL;
1342         }
1343 out:
1344         spin_unlock_bh(&adapter->req_q_lock);
1345         return retval;
1346 }
1347
1348 /**
1349  * zfcp_fsf_exchange_port_data_sync - request information about local port
1350  * @adapter: pointer to struct zfcp_adapter
1351  * @data: pointer to struct fsf_qtcb_bottom_port
1352  * Returns: 0 on success, error otherwise
1353  */
1354 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1355                                      struct fsf_qtcb_bottom_port *data)
1356 {
1357         struct qdio_buffer_element *sbale;
1358         struct zfcp_fsf_req *req = NULL;
1359         int retval = -EIO;
1360
1361         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1362                 return -EOPNOTSUPP;
1363
1364         spin_lock_bh(&adapter->req_q_lock);
1365         if (zfcp_fsf_req_sbal_get(adapter))
1366                 goto out_unlock;
1367
1368         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1369                                   NULL);
1370         if (IS_ERR(req)) {
1371                 retval = PTR_ERR(req);
1372                 goto out_unlock;
1373         }
1374
1375         if (data)
1376                 req->data = data;
1377
1378         sbale = zfcp_qdio_sbale_req(req);
1379         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1380         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1381
1382         req->handler = zfcp_fsf_exchange_port_data_handler;
1383         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1384         retval = zfcp_fsf_req_send(req);
1385         spin_unlock_bh(&adapter->req_q_lock);
1386
1387         if (!retval)
1388                 wait_event(req->completion_wq,
1389                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1390         zfcp_fsf_req_free(req);
1391
1392         return retval;
1393
1394 out_unlock:
1395         spin_unlock_bh(&adapter->req_q_lock);
1396         return retval;
1397 }
1398
1399 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1400 {
1401         struct zfcp_port *port = req->data;
1402         struct fsf_qtcb_header *header = &req->qtcb->header;
1403         struct fsf_plogi *plogi;
1404
1405         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1406                 goto out;
1407
1408         switch (header->fsf_status) {
1409         case FSF_PORT_ALREADY_OPEN:
1410                 break;
1411         case FSF_ACCESS_DENIED:
1412                 zfcp_fsf_access_denied_port(req, port);
1413                 break;
1414         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1415                 dev_warn(&req->adapter->ccw_device->dev,
1416                          "Not enough FCP adapter resources to open "
1417                          "remote port 0x%016Lx\n",
1418                          (unsigned long long)port->wwpn);
1419                 zfcp_erp_port_failed(port, "fsoph_1", req);
1420                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1421                 break;
1422         case FSF_ADAPTER_STATUS_AVAILABLE:
1423                 switch (header->fsf_status_qual.word[0]) {
1424                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1425                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1426                 case FSF_SQ_NO_RETRY_POSSIBLE:
1427                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1428                         break;
1429                 }
1430                 break;
1431         case FSF_GOOD:
1432                 port->handle = header->port_handle;
1433                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1434                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1435                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1436                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1437                                   &port->status);
1438                 /* check whether D_ID has changed during open */
1439                 /*
1440                  * FIXME: This check is not airtight, as the FCP channel does
1441                  * not monitor closures of target port connections caused on
1442                  * the remote side. Thus, they might miss out on invalidating
1443                  * locally cached WWPNs (and other N_Port parameters) of gone
1444                  * target ports. So, our heroic attempt to make things safe
1445                  * could be undermined by 'open port' response data tagged with
1446                  * obsolete WWPNs. Another reason to monitor potential
1447                  * connection closures ourself at least (by interpreting
1448                  * incoming ELS' and unsolicited status). It just crosses my
1449                  * mind that one should be able to cross-check by means of
1450                  * another GID_PN straight after a port has been opened.
1451                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1452                  */
1453                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1454                 if (req->qtcb->bottom.support.els1_length >=
1455                     FSF_PLOGI_MIN_LEN) {
1456                         if (plogi->serv_param.wwpn != port->wwpn)
1457                                 port->d_id = 0;
1458                         else {
1459                                 port->wwnn = plogi->serv_param.wwnn;
1460                                 zfcp_fc_plogi_evaluate(port, plogi);
1461                         }
1462                 }
1463                 break;
1464         case FSF_UNKNOWN_OP_SUBTYPE:
1465                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1466                 break;
1467         }
1468
1469 out:
1470         zfcp_port_put(port);
1471 }
1472
1473 /**
1474  * zfcp_fsf_open_port - create and send open port request
1475  * @erp_action: pointer to struct zfcp_erp_action
1476  * Returns: 0 on success, error otherwise
1477  */
1478 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1479 {
1480         struct qdio_buffer_element *sbale;
1481         struct zfcp_adapter *adapter = erp_action->adapter;
1482         struct zfcp_fsf_req *req;
1483         struct zfcp_port *port = erp_action->port;
1484         int retval = -EIO;
1485
1486         spin_lock_bh(&adapter->req_q_lock);
1487         if (zfcp_fsf_req_sbal_get(adapter))
1488                 goto out;
1489
1490         req = zfcp_fsf_req_create(adapter,
1491                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1492                                   ZFCP_REQ_AUTO_CLEANUP,
1493                                   adapter->pool.fsf_req_erp);
1494         if (IS_ERR(req)) {
1495                 retval = PTR_ERR(req);
1496                 goto out;
1497         }
1498
1499         sbale = zfcp_qdio_sbale_req(req);
1500         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1501         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1502
1503         req->handler = zfcp_fsf_open_port_handler;
1504         req->qtcb->bottom.support.d_id = port->d_id;
1505         req->data = port;
1506         req->erp_action = erp_action;
1507         erp_action->fsf_req = req;
1508         zfcp_port_get(port);
1509
1510         zfcp_fsf_start_erp_timer(req);
1511         retval = zfcp_fsf_req_send(req);
1512         if (retval) {
1513                 zfcp_fsf_req_free(req);
1514                 erp_action->fsf_req = NULL;
1515                 zfcp_port_put(port);
1516         }
1517 out:
1518         spin_unlock_bh(&adapter->req_q_lock);
1519         return retval;
1520 }
1521
1522 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1523 {
1524         struct zfcp_port *port = req->data;
1525
1526         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1527                 return;
1528
1529         switch (req->qtcb->header.fsf_status) {
1530         case FSF_PORT_HANDLE_NOT_VALID:
1531                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1", req);
1532                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1533                 break;
1534         case FSF_ADAPTER_STATUS_AVAILABLE:
1535                 break;
1536         case FSF_GOOD:
1537                 zfcp_erp_modify_port_status(port, "fscph_2", req,
1538                                             ZFCP_STATUS_COMMON_OPEN,
1539                                             ZFCP_CLEAR);
1540                 break;
1541         }
1542 }
1543
1544 /**
1545  * zfcp_fsf_close_port - create and send close port request
1546  * @erp_action: pointer to struct zfcp_erp_action
1547  * Returns: 0 on success, error otherwise
1548  */
1549 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1550 {
1551         struct qdio_buffer_element *sbale;
1552         struct zfcp_adapter *adapter = erp_action->adapter;
1553         struct zfcp_fsf_req *req;
1554         int retval = -EIO;
1555
1556         spin_lock_bh(&adapter->req_q_lock);
1557         if (zfcp_fsf_req_sbal_get(adapter))
1558                 goto out;
1559
1560         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1561                                   ZFCP_REQ_AUTO_CLEANUP,
1562                                   adapter->pool.fsf_req_erp);
1563         if (IS_ERR(req)) {
1564                 retval = PTR_ERR(req);
1565                 goto out;
1566         }
1567
1568         sbale = zfcp_qdio_sbale_req(req);
1569         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1570         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1571
1572         req->handler = zfcp_fsf_close_port_handler;
1573         req->data = erp_action->port;
1574         req->erp_action = erp_action;
1575         req->qtcb->header.port_handle = erp_action->port->handle;
1576         erp_action->fsf_req = req;
1577
1578         zfcp_fsf_start_erp_timer(req);
1579         retval = zfcp_fsf_req_send(req);
1580         if (retval) {
1581                 zfcp_fsf_req_free(req);
1582                 erp_action->fsf_req = NULL;
1583         }
1584 out:
1585         spin_unlock_bh(&adapter->req_q_lock);
1586         return retval;
1587 }
1588
1589 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1590 {
1591         struct zfcp_wka_port *wka_port = req->data;
1592         struct fsf_qtcb_header *header = &req->qtcb->header;
1593
1594         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1595                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1596                 goto out;
1597         }
1598
1599         switch (header->fsf_status) {
1600         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1601                 dev_warn(&req->adapter->ccw_device->dev,
1602                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1603                 /* fall through */
1604         case FSF_ADAPTER_STATUS_AVAILABLE:
1605                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1606                 /* fall through */
1607         case FSF_ACCESS_DENIED:
1608                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1609                 break;
1610         case FSF_PORT_ALREADY_OPEN:
1611                 break;
1612         case FSF_GOOD:
1613                 wka_port->handle = header->port_handle;
1614                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1615         }
1616 out:
1617         wake_up(&wka_port->completion_wq);
1618 }
1619
1620 /**
1621  * zfcp_fsf_open_wka_port - create and send open wka-port request
1622  * @wka_port: pointer to struct zfcp_wka_port
1623  * Returns: 0 on success, error otherwise
1624  */
1625 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1626 {
1627         struct qdio_buffer_element *sbale;
1628         struct zfcp_adapter *adapter = wka_port->adapter;
1629         struct zfcp_fsf_req *req;
1630         int retval = -EIO;
1631
1632         spin_lock_bh(&adapter->req_q_lock);
1633         if (zfcp_fsf_req_sbal_get(adapter))
1634                 goto out;
1635
1636         req = zfcp_fsf_req_create(adapter,
1637                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1638                                   ZFCP_REQ_AUTO_CLEANUP,
1639                                   adapter->pool.fsf_req_erp);
1640         if (unlikely(IS_ERR(req))) {
1641                 retval = PTR_ERR(req);
1642                 goto out;
1643         }
1644
1645         sbale = zfcp_qdio_sbale_req(req);
1646         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1647         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1648
1649         req->handler = zfcp_fsf_open_wka_port_handler;
1650         req->qtcb->bottom.support.d_id = wka_port->d_id;
1651         req->data = wka_port;
1652
1653         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1654         retval = zfcp_fsf_req_send(req);
1655         if (retval)
1656                 zfcp_fsf_req_free(req);
1657 out:
1658         spin_unlock_bh(&adapter->req_q_lock);
1659         return retval;
1660 }
1661
1662 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1663 {
1664         struct zfcp_wka_port *wka_port = req->data;
1665
1666         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1667                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1668                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1", req);
1669         }
1670
1671         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1672         wake_up(&wka_port->completion_wq);
1673 }
1674
1675 /**
1676  * zfcp_fsf_close_wka_port - create and send close wka port request
1677  * @erp_action: pointer to struct zfcp_erp_action
1678  * Returns: 0 on success, error otherwise
1679  */
1680 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1681 {
1682         struct qdio_buffer_element *sbale;
1683         struct zfcp_adapter *adapter = wka_port->adapter;
1684         struct zfcp_fsf_req *req;
1685         int retval = -EIO;
1686
1687         spin_lock_bh(&adapter->req_q_lock);
1688         if (zfcp_fsf_req_sbal_get(adapter))
1689                 goto out;
1690
1691         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1692                                   ZFCP_REQ_AUTO_CLEANUP,
1693                                   adapter->pool.fsf_req_erp);
1694         if (unlikely(IS_ERR(req))) {
1695                 retval = PTR_ERR(req);
1696                 goto out;
1697         }
1698
1699         sbale = zfcp_qdio_sbale_req(req);
1700         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1701         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1702
1703         req->handler = zfcp_fsf_close_wka_port_handler;
1704         req->data = wka_port;
1705         req->qtcb->header.port_handle = wka_port->handle;
1706
1707         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1708         retval = zfcp_fsf_req_send(req);
1709         if (retval)
1710                 zfcp_fsf_req_free(req);
1711 out:
1712         spin_unlock_bh(&adapter->req_q_lock);
1713         return retval;
1714 }
1715
1716 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1717 {
1718         struct zfcp_port *port = req->data;
1719         struct fsf_qtcb_header *header = &req->qtcb->header;
1720         struct zfcp_unit *unit;
1721
1722         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1723                 return;
1724
1725         switch (header->fsf_status) {
1726         case FSF_PORT_HANDLE_NOT_VALID:
1727                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1", req);
1728                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1729                 break;
1730         case FSF_ACCESS_DENIED:
1731                 zfcp_fsf_access_denied_port(req, port);
1732                 break;
1733         case FSF_PORT_BOXED:
1734                 zfcp_erp_port_boxed(port, "fscpph2", req);
1735                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1736                                ZFCP_STATUS_FSFREQ_RETRY;
1737                 /* can't use generic zfcp_erp_modify_port_status because
1738                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1739                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1740                 list_for_each_entry(unit, &port->unit_list_head, list)
1741                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1742                                           &unit->status);
1743                 break;
1744         case FSF_ADAPTER_STATUS_AVAILABLE:
1745                 switch (header->fsf_status_qual.word[0]) {
1746                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1747                         /* fall through */
1748                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1749                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1750                         break;
1751                 }
1752                 break;
1753         case FSF_GOOD:
1754                 /* can't use generic zfcp_erp_modify_port_status because
1755                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1756                  */
1757                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1758                 list_for_each_entry(unit, &port->unit_list_head, list)
1759                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1760                                           &unit->status);
1761                 break;
1762         }
1763 }
1764
1765 /**
1766  * zfcp_fsf_close_physical_port - close physical port
1767  * @erp_action: pointer to struct zfcp_erp_action
1768  * Returns: 0 on success
1769  */
1770 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1771 {
1772         struct qdio_buffer_element *sbale;
1773         struct zfcp_adapter *adapter = erp_action->adapter;
1774         struct zfcp_fsf_req *req;
1775         int retval = -EIO;
1776
1777         spin_lock_bh(&adapter->req_q_lock);
1778         if (zfcp_fsf_req_sbal_get(adapter))
1779                 goto out;
1780
1781         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1782                                   ZFCP_REQ_AUTO_CLEANUP,
1783                                   adapter->pool.fsf_req_erp);
1784         if (IS_ERR(req)) {
1785                 retval = PTR_ERR(req);
1786                 goto out;
1787         }
1788
1789         sbale = zfcp_qdio_sbale_req(req);
1790         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1791         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1792
1793         req->data = erp_action->port;
1794         req->qtcb->header.port_handle = erp_action->port->handle;
1795         req->erp_action = erp_action;
1796         req->handler = zfcp_fsf_close_physical_port_handler;
1797         erp_action->fsf_req = req;
1798
1799         zfcp_fsf_start_erp_timer(req);
1800         retval = zfcp_fsf_req_send(req);
1801         if (retval) {
1802                 zfcp_fsf_req_free(req);
1803                 erp_action->fsf_req = NULL;
1804         }
1805 out:
1806         spin_unlock_bh(&adapter->req_q_lock);
1807         return retval;
1808 }
1809
1810 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1811 {
1812         struct zfcp_adapter *adapter = req->adapter;
1813         struct zfcp_unit *unit = req->data;
1814         struct fsf_qtcb_header *header = &req->qtcb->header;
1815         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1816         struct fsf_queue_designator *queue_designator =
1817                                 &header->fsf_status_qual.fsf_queue_designator;
1818         int exclusive, readwrite;
1819
1820         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1821                 return;
1822
1823         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1824                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1825                           ZFCP_STATUS_UNIT_SHARED |
1826                           ZFCP_STATUS_UNIT_READONLY,
1827                           &unit->status);
1828
1829         switch (header->fsf_status) {
1830
1831         case FSF_PORT_HANDLE_NOT_VALID:
1832                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fsouh_1", req);
1833                 /* fall through */
1834         case FSF_LUN_ALREADY_OPEN:
1835                 break;
1836         case FSF_ACCESS_DENIED:
1837                 zfcp_fsf_access_denied_unit(req, unit);
1838                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1839                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1840                 break;
1841         case FSF_PORT_BOXED:
1842                 zfcp_erp_port_boxed(unit->port, "fsouh_2", req);
1843                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1844                                ZFCP_STATUS_FSFREQ_RETRY;
1845                 break;
1846         case FSF_LUN_SHARING_VIOLATION:
1847                 if (header->fsf_status_qual.word[0])
1848                         dev_warn(&adapter->ccw_device->dev,
1849                                  "LUN 0x%Lx on port 0x%Lx is already in "
1850                                  "use by CSS%d, MIF Image ID %x\n",
1851                                  (unsigned long long)unit->fcp_lun,
1852                                  (unsigned long long)unit->port->wwpn,
1853                                  queue_designator->cssid,
1854                                  queue_designator->hla);
1855                 else
1856                         zfcp_act_eval_err(adapter,
1857                                           header->fsf_status_qual.word[2]);
1858                 zfcp_erp_unit_access_denied(unit, "fsouh_3", req);
1859                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1860                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1861                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1862                 break;
1863         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1864                 dev_warn(&adapter->ccw_device->dev,
1865                          "No handle is available for LUN "
1866                          "0x%016Lx on port 0x%016Lx\n",
1867                          (unsigned long long)unit->fcp_lun,
1868                          (unsigned long long)unit->port->wwpn);
1869                 zfcp_erp_unit_failed(unit, "fsouh_4", req);
1870                 /* fall through */
1871         case FSF_INVALID_COMMAND_OPTION:
1872                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1873                 break;
1874         case FSF_ADAPTER_STATUS_AVAILABLE:
1875                 switch (header->fsf_status_qual.word[0]) {
1876                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1877                         zfcp_test_link(unit->port);
1878                         /* fall through */
1879                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1880                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1881                         break;
1882                 }
1883                 break;
1884
1885         case FSF_GOOD:
1886                 unit->handle = header->lun_handle;
1887                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1888
1889                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1890                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1891                     !zfcp_ccw_priv_sch(adapter)) {
1892                         exclusive = (bottom->lun_access_info &
1893                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1894                         readwrite = (bottom->lun_access_info &
1895                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1896
1897                         if (!exclusive)
1898                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1899                                                 &unit->status);
1900
1901                         if (!readwrite) {
1902                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1903                                                 &unit->status);
1904                                 dev_info(&adapter->ccw_device->dev,
1905                                          "SCSI device at LUN 0x%016Lx on port "
1906                                          "0x%016Lx opened read-only\n",
1907                                          (unsigned long long)unit->fcp_lun,
1908                                          (unsigned long long)unit->port->wwpn);
1909                         }
1910
1911                         if (exclusive && !readwrite) {
1912                                 dev_err(&adapter->ccw_device->dev,
1913                                         "Exclusive read-only access not "
1914                                         "supported (unit 0x%016Lx, "
1915                                         "port 0x%016Lx)\n",
1916                                         (unsigned long long)unit->fcp_lun,
1917                                         (unsigned long long)unit->port->wwpn);
1918                                 zfcp_erp_unit_failed(unit, "fsouh_5", req);
1919                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1920                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_6", req);
1921                         } else if (!exclusive && readwrite) {
1922                                 dev_err(&adapter->ccw_device->dev,
1923                                         "Shared read-write access not "
1924                                         "supported (unit 0x%016Lx, port "
1925                                         "0x%016Lx)\n",
1926                                         (unsigned long long)unit->fcp_lun,
1927                                         (unsigned long long)unit->port->wwpn);
1928                                 zfcp_erp_unit_failed(unit, "fsouh_7", req);
1929                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1930                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_8", req);
1931                         }
1932                 }
1933                 break;
1934         }
1935 }
1936
1937 /**
1938  * zfcp_fsf_open_unit - open unit
1939  * @erp_action: pointer to struct zfcp_erp_action
1940  * Returns: 0 on success, error otherwise
1941  */
1942 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1943 {
1944         struct qdio_buffer_element *sbale;
1945         struct zfcp_adapter *adapter = erp_action->adapter;
1946         struct zfcp_fsf_req *req;
1947         int retval = -EIO;
1948
1949         spin_lock_bh(&adapter->req_q_lock);
1950         if (zfcp_fsf_req_sbal_get(adapter))
1951                 goto out;
1952
1953         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1954                                   ZFCP_REQ_AUTO_CLEANUP,
1955                                   adapter->pool.fsf_req_erp);
1956         if (IS_ERR(req)) {
1957                 retval = PTR_ERR(req);
1958                 goto out;
1959         }
1960
1961         sbale = zfcp_qdio_sbale_req(req);
1962         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1963         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1964
1965         req->qtcb->header.port_handle = erp_action->port->handle;
1966         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1967         req->handler = zfcp_fsf_open_unit_handler;
1968         req->data = erp_action->unit;
1969         req->erp_action = erp_action;
1970         erp_action->fsf_req = req;
1971
1972         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1973                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1974
1975         zfcp_fsf_start_erp_timer(req);
1976         retval = zfcp_fsf_req_send(req);
1977         if (retval) {
1978                 zfcp_fsf_req_free(req);
1979                 erp_action->fsf_req = NULL;
1980         }
1981 out:
1982         spin_unlock_bh(&adapter->req_q_lock);
1983         return retval;
1984 }
1985
1986 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1987 {
1988         struct zfcp_unit *unit = req->data;
1989
1990         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1991                 return;
1992
1993         switch (req->qtcb->header.fsf_status) {
1994         case FSF_PORT_HANDLE_NOT_VALID:
1995                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fscuh_1", req);
1996                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1997                 break;
1998         case FSF_LUN_HANDLE_NOT_VALID:
1999                 zfcp_erp_port_reopen(unit->port, 0, "fscuh_2", req);
2000                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2001                 break;
2002         case FSF_PORT_BOXED:
2003                 zfcp_erp_port_boxed(unit->port, "fscuh_3", req);
2004                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2005                                ZFCP_STATUS_FSFREQ_RETRY;
2006                 break;
2007         case FSF_ADAPTER_STATUS_AVAILABLE:
2008                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
2009                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2010                         zfcp_test_link(unit->port);
2011                         /* fall through */
2012                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2013                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2014                         break;
2015                 }
2016                 break;
2017         case FSF_GOOD:
2018                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2019                 break;
2020         }
2021 }
2022
2023 /**
2024  * zfcp_fsf_close_unit - close zfcp unit
2025  * @erp_action: pointer to struct zfcp_unit
2026  * Returns: 0 on success, error otherwise
2027  */
2028 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2029 {
2030         struct qdio_buffer_element *sbale;
2031         struct zfcp_adapter *adapter = erp_action->adapter;
2032         struct zfcp_fsf_req *req;
2033         int retval = -EIO;
2034
2035         spin_lock_bh(&adapter->req_q_lock);
2036         if (zfcp_fsf_req_sbal_get(adapter))
2037                 goto out;
2038         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2039                                   ZFCP_REQ_AUTO_CLEANUP,
2040                                   adapter->pool.fsf_req_erp);
2041         if (IS_ERR(req)) {
2042                 retval = PTR_ERR(req);
2043                 goto out;
2044         }
2045
2046         sbale = zfcp_qdio_sbale_req(req);
2047         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2048         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2049
2050         req->qtcb->header.port_handle = erp_action->port->handle;
2051         req->qtcb->header.lun_handle = erp_action->unit->handle;
2052         req->handler = zfcp_fsf_close_unit_handler;
2053         req->data = erp_action->unit;
2054         req->erp_action = erp_action;
2055         erp_action->fsf_req = req;
2056
2057         zfcp_fsf_start_erp_timer(req);
2058         retval = zfcp_fsf_req_send(req);
2059         if (retval) {
2060                 zfcp_fsf_req_free(req);
2061                 erp_action->fsf_req = NULL;
2062         }
2063 out:
2064         spin_unlock_bh(&adapter->req_q_lock);
2065         return retval;
2066 }
2067
2068 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2069 {
2070         lat_rec->sum += lat;
2071         lat_rec->min = min(lat_rec->min, lat);
2072         lat_rec->max = max(lat_rec->max, lat);
2073 }
2074
2075 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2076 {
2077         struct fsf_qual_latency_info *lat_inf;
2078         struct latency_cont *lat;
2079         struct zfcp_unit *unit = req->unit;
2080
2081         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2082
2083         switch (req->qtcb->bottom.io.data_direction) {
2084         case FSF_DATADIR_READ:
2085                 lat = &unit->latencies.read;
2086                 break;
2087         case FSF_DATADIR_WRITE:
2088                 lat = &unit->latencies.write;
2089                 break;
2090         case FSF_DATADIR_CMND:
2091                 lat = &unit->latencies.cmd;
2092                 break;
2093         default:
2094                 return;
2095         }
2096
2097         spin_lock(&unit->latencies.lock);
2098         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2099         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2100         lat->counter++;
2101         spin_unlock(&unit->latencies.lock);
2102 }
2103
2104 #ifdef CONFIG_BLK_DEV_IO_TRACE
2105 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2106 {
2107         struct fsf_qual_latency_info *lat_inf;
2108         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2109         struct request *req = scsi_cmnd->request;
2110         struct zfcp_blk_drv_data trace;
2111         int ticks = fsf_req->adapter->timer_ticks;
2112
2113         trace.flags = 0;
2114         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2115         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2116                 trace.flags |= ZFCP_BLK_LAT_VALID;
2117                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2118                 trace.channel_lat = lat_inf->channel_lat * ticks;
2119                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2120         }
2121         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2122                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2123         trace.inb_usage = fsf_req->qdio_inb_usage;
2124         trace.outb_usage = fsf_req->qdio_outb_usage;
2125
2126         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2127 }
2128 #else
2129 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2130 {
2131 }
2132 #endif
2133
2134 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2135 {
2136         struct scsi_cmnd *scpnt;
2137         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2138             &(req->qtcb->bottom.io.fcp_rsp);
2139         u32 sns_len;
2140         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2141         unsigned long flags;
2142
2143         read_lock_irqsave(&req->adapter->abort_lock, flags);
2144
2145         scpnt = req->data;
2146         if (unlikely(!scpnt)) {
2147                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2148                 return;
2149         }
2150
2151         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2152                 set_host_byte(scpnt, DID_SOFT_ERROR);
2153                 goto skip_fsfstatus;
2154         }
2155
2156         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2157                 set_host_byte(scpnt, DID_ERROR);
2158                 goto skip_fsfstatus;
2159         }
2160
2161         set_msg_byte(scpnt, COMMAND_COMPLETE);
2162
2163         scpnt->result |= fcp_rsp_iu->scsi_status;
2164
2165         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2166                 zfcp_fsf_req_latency(req);
2167
2168         zfcp_fsf_trace_latency(req);
2169
2170         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2171                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2172                         set_host_byte(scpnt, DID_OK);
2173                 else {
2174                         set_host_byte(scpnt, DID_ERROR);
2175                         goto skip_fsfstatus;
2176                 }
2177         }
2178
2179         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2180                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2181                           fcp_rsp_iu->fcp_rsp_len;
2182                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2183                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2184
2185                 memcpy(scpnt->sense_buffer,
2186                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2187         }
2188
2189         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2190                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2191                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2192                     scpnt->underflow)
2193                         set_host_byte(scpnt, DID_ERROR);
2194         }
2195 skip_fsfstatus:
2196         if (scpnt->result != 0)
2197                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2198         else if (scpnt->retries > 0)
2199                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2200         else
2201                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2202
2203         scpnt->host_scribble = NULL;
2204         (scpnt->scsi_done) (scpnt);
2205         /*
2206          * We must hold this lock until scsi_done has been called.
2207          * Otherwise we may call scsi_done after abort regarding this
2208          * command has completed.
2209          * Note: scsi_done must not block!
2210          */
2211         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2212 }
2213
2214 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2215 {
2216         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2217             &(req->qtcb->bottom.io.fcp_rsp);
2218         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2219
2220         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2221              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2222                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2223 }
2224
2225
2226 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2227 {
2228         struct zfcp_unit *unit;
2229         struct fsf_qtcb_header *header = &req->qtcb->header;
2230
2231         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2232                 unit = req->data;
2233         else
2234                 unit = req->unit;
2235
2236         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2237                 goto skip_fsfstatus;
2238
2239         switch (header->fsf_status) {
2240         case FSF_HANDLE_MISMATCH:
2241         case FSF_PORT_HANDLE_NOT_VALID:
2242                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fssfch1", req);
2243                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2244                 break;
2245         case FSF_FCPLUN_NOT_VALID:
2246         case FSF_LUN_HANDLE_NOT_VALID:
2247                 zfcp_erp_port_reopen(unit->port, 0, "fssfch2", req);
2248                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2249                 break;
2250         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2251                 zfcp_fsf_class_not_supp(req);
2252                 break;
2253         case FSF_ACCESS_DENIED:
2254                 zfcp_fsf_access_denied_unit(req, unit);
2255                 break;
2256         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2257                 dev_err(&req->adapter->ccw_device->dev,
2258                         "Incorrect direction %d, unit 0x%016Lx on port "
2259                         "0x%016Lx closed\n",
2260                         req->qtcb->bottom.io.data_direction,
2261                         (unsigned long long)unit->fcp_lun,
2262                         (unsigned long long)unit->port->wwpn);
2263                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch3",
2264                                           req);
2265                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2266                 break;
2267         case FSF_CMND_LENGTH_NOT_VALID:
2268                 dev_err(&req->adapter->ccw_device->dev,
2269                         "Incorrect CDB length %d, unit 0x%016Lx on "
2270                         "port 0x%016Lx closed\n",
2271                         req->qtcb->bottom.io.fcp_cmnd_length,
2272                         (unsigned long long)unit->fcp_lun,
2273                         (unsigned long long)unit->port->wwpn);
2274                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch4",
2275                                           req);
2276                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2277                 break;
2278         case FSF_PORT_BOXED:
2279                 zfcp_erp_port_boxed(unit->port, "fssfch5", req);
2280                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2281                                ZFCP_STATUS_FSFREQ_RETRY;
2282                 break;
2283         case FSF_LUN_BOXED:
2284                 zfcp_erp_unit_boxed(unit, "fssfch6", req);
2285                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2286                                ZFCP_STATUS_FSFREQ_RETRY;
2287                 break;
2288         case FSF_ADAPTER_STATUS_AVAILABLE:
2289                 if (header->fsf_status_qual.word[0] ==
2290                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2291                         zfcp_test_link(unit->port);
2292                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2293                 break;
2294         }
2295 skip_fsfstatus:
2296         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2297                 zfcp_fsf_send_fcp_ctm_handler(req);
2298         else {
2299                 zfcp_fsf_send_fcp_command_task_handler(req);
2300                 req->unit = NULL;
2301                 zfcp_unit_put(unit);
2302         }
2303 }
2304
2305 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2306 {
2307         u32 *fcp_dl_ptr;
2308
2309         /*
2310          * fcp_dl_addr = start address of fcp_cmnd structure +
2311          * size of fixed part + size of dynamically sized add_dcp_cdb field
2312          * SEE FCP-2 documentation
2313          */
2314         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2315                         (fcp_cmd->add_fcp_cdb_length << 2));
2316         *fcp_dl_ptr = fcp_dl;
2317 }
2318
2319 /**
2320  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2321  * @unit: unit where command is sent to
2322  * @scsi_cmnd: scsi command to be sent
2323  */
2324 int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
2325                                    struct scsi_cmnd *scsi_cmnd)
2326 {
2327         struct zfcp_fsf_req *req;
2328         struct fcp_cmnd_iu *fcp_cmnd_iu;
2329         unsigned int sbtype = SBAL_FLAGS0_TYPE_READ;
2330         int real_bytes, retval = -EIO;
2331         struct zfcp_adapter *adapter = unit->port->adapter;
2332
2333         if (unlikely(!(atomic_read(&unit->status) &
2334                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2335                 return -EBUSY;
2336
2337         spin_lock(&adapter->req_q_lock);
2338         if (atomic_read(&adapter->req_q.count) <= 0) {
2339                 atomic_inc(&adapter->qdio_outb_full);
2340                 goto out;
2341         }
2342         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND,
2343                                   ZFCP_REQ_AUTO_CLEANUP,
2344                                   adapter->pool.fsf_req_scsi);
2345         if (IS_ERR(req)) {
2346                 retval = PTR_ERR(req);
2347                 goto out;
2348         }
2349
2350         zfcp_unit_get(unit);
2351         req->unit = unit;
2352         req->data = scsi_cmnd;
2353         req->handler = zfcp_fsf_send_fcp_command_handler;
2354         req->qtcb->header.lun_handle = unit->handle;
2355         req->qtcb->header.port_handle = unit->port->handle;
2356         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2357
2358         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2359
2360         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2361         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2362         /*
2363          * set depending on data direction:
2364          *      data direction bits in SBALE (SB Type)
2365          *      data direction bits in QTCB
2366          *      data direction bits in FCP_CMND IU
2367          */
2368         switch (scsi_cmnd->sc_data_direction) {
2369         case DMA_NONE:
2370                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2371                 break;
2372         case DMA_FROM_DEVICE:
2373                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2374                 fcp_cmnd_iu->rddata = 1;
2375                 break;
2376         case DMA_TO_DEVICE:
2377                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2378                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2379                 fcp_cmnd_iu->wddata = 1;
2380                 break;
2381         case DMA_BIDIRECTIONAL:
2382                 goto failed_scsi_cmnd;
2383         }
2384
2385         if (likely((scsi_cmnd->device->simple_tags) ||
2386                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2387                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2388                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2389         else
2390                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2391
2392         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2393                 fcp_cmnd_iu->add_fcp_cdb_length =
2394                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2395
2396         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2397
2398         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2399                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2400
2401         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2402                                              scsi_sglist(scsi_cmnd),
2403                                              FSF_MAX_SBALS_PER_REQ);
2404         if (unlikely(real_bytes < 0)) {
2405                 if (req->sbal_number >= FSF_MAX_SBALS_PER_REQ) {
2406                         dev_err(&adapter->ccw_device->dev,
2407                                 "Oversize data package, unit 0x%016Lx "
2408                                 "on port 0x%016Lx closed\n",
2409                                 (unsigned long long)unit->fcp_lun,
2410                                 (unsigned long long)unit->port->wwpn);
2411                         zfcp_erp_unit_shutdown(unit, 0, "fssfct1", req);
2412                         retval = -EINVAL;
2413                 }
2414                 goto failed_scsi_cmnd;
2415         }
2416
2417         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2418
2419         retval = zfcp_fsf_req_send(req);
2420         if (unlikely(retval))
2421                 goto failed_scsi_cmnd;
2422
2423         goto out;
2424
2425 failed_scsi_cmnd:
2426         zfcp_unit_put(unit);
2427         zfcp_fsf_req_free(req);
2428         scsi_cmnd->host_scribble = NULL;
2429 out:
2430         spin_unlock(&adapter->req_q_lock);
2431         return retval;
2432 }
2433
2434 /**
2435  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2436  * @unit: pointer to struct zfcp_unit
2437  * @tm_flags: unsigned byte for task management flags
2438  * Returns: on success pointer to struct fsf_req, NULL otherwise
2439  */
2440 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
2441 {
2442         struct qdio_buffer_element *sbale;
2443         struct zfcp_fsf_req *req = NULL;
2444         struct fcp_cmnd_iu *fcp_cmnd_iu;
2445         struct zfcp_adapter *adapter = unit->port->adapter;
2446
2447         if (unlikely(!(atomic_read(&unit->status) &
2448                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2449                 return NULL;
2450
2451         spin_lock_bh(&adapter->req_q_lock);
2452         if (zfcp_fsf_req_sbal_get(adapter))
2453                 goto out;
2454         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, 0,
2455                                   adapter->pool.fsf_req_scsi);
2456         if (IS_ERR(req)) {
2457                 req = NULL;
2458                 goto out;
2459         }
2460
2461         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2462         req->data = unit;
2463         req->handler = zfcp_fsf_send_fcp_command_handler;
2464         req->qtcb->header.lun_handle = unit->handle;
2465         req->qtcb->header.port_handle = unit->port->handle;
2466         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2467         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2468         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2469                                                 sizeof(u32);
2470
2471         sbale = zfcp_qdio_sbale_req(req);
2472         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2473         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2474
2475         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2476         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2477         fcp_cmnd_iu->task_management_flags = tm_flags;
2478
2479         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2480         if (!zfcp_fsf_req_send(req))
2481                 goto out;
2482
2483         zfcp_fsf_req_free(req);
2484         req = NULL;
2485 out:
2486         spin_unlock_bh(&adapter->req_q_lock);
2487         return req;
2488 }
2489
2490 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2491 {
2492 }
2493
2494 /**
2495  * zfcp_fsf_control_file - control file upload/download
2496  * @adapter: pointer to struct zfcp_adapter
2497  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2498  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2499  */
2500 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2501                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2502 {
2503         struct qdio_buffer_element *sbale;
2504         struct zfcp_fsf_req *req = NULL;
2505         struct fsf_qtcb_bottom_support *bottom;
2506         int direction, retval = -EIO, bytes;
2507
2508         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2509                 return ERR_PTR(-EOPNOTSUPP);
2510
2511         switch (fsf_cfdc->command) {
2512         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2513                 direction = SBAL_FLAGS0_TYPE_WRITE;
2514                 break;
2515         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2516                 direction = SBAL_FLAGS0_TYPE_READ;
2517                 break;
2518         default:
2519                 return ERR_PTR(-EINVAL);
2520         }
2521
2522         spin_lock_bh(&adapter->req_q_lock);
2523         if (zfcp_fsf_req_sbal_get(adapter))
2524                 goto out;
2525
2526         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2527         if (IS_ERR(req)) {
2528                 retval = -EPERM;
2529                 goto out;
2530         }
2531
2532         req->handler = zfcp_fsf_control_file_handler;
2533
2534         sbale = zfcp_qdio_sbale_req(req);
2535         sbale[0].flags |= direction;
2536
2537         bottom = &req->qtcb->bottom.support;
2538         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2539         bottom->option = fsf_cfdc->option;
2540
2541         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2542                                         FSF_MAX_SBALS_PER_REQ);
2543         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2544                 retval = -ENOMEM;
2545                 zfcp_fsf_req_free(req);
2546                 goto out;
2547         }
2548
2549         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2550         retval = zfcp_fsf_req_send(req);
2551 out:
2552         spin_unlock_bh(&adapter->req_q_lock);
2553
2554         if (!retval) {
2555                 wait_event(req->completion_wq,
2556                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2557                 return req;
2558         }
2559         return ERR_PTR(retval);
2560 }