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

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