git.oblomov.eu Git - 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
 772         /* put allocated FSF request into hash table */
 773         spin_lock_irqsave(&adapter->req_list_lock, flags);
 774         idx = zfcp_reqlist_hash(req->req_id);
 775         list_add_tail(&req->list, &adapter->req_list[idx]);
 776         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 777
 778         req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
 779         req->issued = get_clock();
 780         if (zfcp_qdio_send(req)) {
 781                 del_timer(&req->timer);
 782                 spin_lock_irqsave(&adapter->req_list_lock, flags);
 783                 /* lookup request again, list might have changed */
 784                 if (zfcp_reqlist_find_safe(adapter, req))
 785                         zfcp_reqlist_remove(adapter, req);
 786                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 787                 zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1", req);
 788                 return -EIO;
 789         }
 790
 791         /* Don't increase for unsolicited status */
 792         if (req->qtcb)
 793                 adapter->fsf_req_seq_no++;
 794         adapter->req_no++;
 795
 796         return 0;
 797 }
 798
 799 /**
 800  * zfcp_fsf_status_read - send status read request
 801  * @adapter: pointer to struct zfcp_adapter
 802  * @req_flags: request flags
 803  * Returns: 0 on success, ERROR otherwise
 804  */
 805 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 806 {
 807         struct zfcp_fsf_req *req;
 808         struct fsf_status_read_buffer *sr_buf;
 809         struct qdio_buffer_element *sbale;
 810         int retval = -EIO;
 811
 812         spin_lock_bh(&adapter->req_q_lock);
 813         if (zfcp_fsf_req_sbal_get(adapter))
 814                 goto out;
 815
 816         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 817                                   ZFCP_REQ_NO_QTCB,
 818                                   adapter->pool.fsf_req_status_read);
 819         if (IS_ERR(req)) {
 820                 retval = PTR_ERR(req);
 821                 goto out;
 822         }
 823
 824         sbale = zfcp_qdio_sbale_req(req);
 825         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 826         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 827         req->sbale_curr = 2;
 828
 829         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 830         if (!sr_buf) {
 831                 retval = -ENOMEM;
 832                 goto failed_buf;
 833         }
 834         memset(sr_buf, 0, sizeof(*sr_buf));
 835         req->data = sr_buf;
 836         sbale = zfcp_qdio_sbale_curr(req);
 837         sbale->addr = (void *) sr_buf;
 838         sbale->length = sizeof(*sr_buf);
 839
 840         retval = zfcp_fsf_req_send(req);
 841         if (retval)
 842                 goto failed_req_send;
 843
 844         goto out;
 845
 846 failed_req_send:
 847         mempool_free(sr_buf, adapter->pool.data_status_read);
 848 failed_buf:
 849         zfcp_fsf_req_free(req);
 850         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 851 out:
 852         spin_unlock_bh(&adapter->req_q_lock);
 853         return retval;
 854 }
 855
 856 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 857 {
 858         struct zfcp_unit *unit = req->data;
 859         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 860
 861         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 862                 return;
 863
 864         switch (req->qtcb->header.fsf_status) {
 865         case FSF_PORT_HANDLE_NOT_VALID:
 866                 if (fsq->word[0] == fsq->word[1]) {
 867                         zfcp_erp_adapter_reopen(unit->port->adapter, 0,
 868                                                 "fsafch1", req);
 869                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 870                 }
 871                 break;
 872         case FSF_LUN_HANDLE_NOT_VALID:
 873                 if (fsq->word[0] == fsq->word[1]) {
 874                         zfcp_erp_port_reopen(unit->port, 0, "fsafch2", req);
 875                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 876                 }
 877                 break;
 878         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 879                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 880                 break;
 881         case FSF_PORT_BOXED:
 882                 zfcp_erp_port_boxed(unit->port, "fsafch3", req);
 883                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 884                                ZFCP_STATUS_FSFREQ_RETRY;
 885                 break;
 886         case FSF_LUN_BOXED:
 887                 zfcp_erp_unit_boxed(unit, "fsafch4", req);
 888                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 889                                ZFCP_STATUS_FSFREQ_RETRY;
 890                 break;
 891         case FSF_ADAPTER_STATUS_AVAILABLE:
 892                 switch (fsq->word[0]) {
 893                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 894                         zfcp_test_link(unit->port);
 895                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 896                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 897                         break;
 898                 }
 899                 break;
 900         case FSF_GOOD:
 901                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 902                 break;
 903         }
 904 }
 905
 906 /**
 907  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 908  * @old_req_id: unsigned long
 909  * @unit: pointer to struct zfcp_unit
 910  * Returns: pointer to struct zfcp_fsf_req
 911  */
 912
 913 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 914                                                 struct zfcp_unit *unit)
 915 {
 916         struct qdio_buffer_element *sbale;
 917         struct zfcp_fsf_req *req = NULL;
 918         struct zfcp_adapter *adapter = unit->port->adapter;
 919
 920         spin_lock_bh(&adapter->req_q_lock);
 921         if (zfcp_fsf_req_sbal_get(adapter))
 922                 goto out;
 923         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 924                                   0, adapter->pool.fsf_req_abort);
 925         if (IS_ERR(req)) {
 926                 req = NULL;
 927                 goto out;
 928         }
 929
 930         if (unlikely(!(atomic_read(&unit->status) &
 931                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 932                 goto out_error_free;
 933
 934         sbale = zfcp_qdio_sbale_req(req);
 935         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 936         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 937
 938         req->data = unit;
 939         req->handler = zfcp_fsf_abort_fcp_command_handler;
 940         req->qtcb->header.lun_handle = unit->handle;
 941         req->qtcb->header.port_handle = unit->port->handle;
 942         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 943
 944         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 945         if (!zfcp_fsf_req_send(req))
 946                 goto out;
 947
 948 out_error_free:
 949         zfcp_fsf_req_free(req);
 950         req = NULL;
 951 out:
 952         spin_unlock_bh(&adapter->req_q_lock);
 953         return req;
 954 }
 955
 956 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 957 {
 958         struct zfcp_adapter *adapter = req->adapter;
 959         struct zfcp_send_ct *send_ct = req->data;
 960         struct fsf_qtcb_header *header = &req->qtcb->header;
 961
 962         send_ct->status = -EINVAL;
 963
 964         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 965                 goto skip_fsfstatus;
 966
 967         switch (header->fsf_status) {
 968         case FSF_GOOD:
 969                 zfcp_san_dbf_event_ct_response(req);
 970                 send_ct->status = 0;
 971                 break;
 972         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 973                 zfcp_fsf_class_not_supp(req);
 974                 break;
 975         case FSF_ADAPTER_STATUS_AVAILABLE:
 976                 switch (header->fsf_status_qual.word[0]){
 977                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 978                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 979                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 980                         break;
 981                 }
 982                 break;
 983         case FSF_ACCESS_DENIED:
 984                 break;
 985         case FSF_PORT_BOXED:
 986                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 987                                ZFCP_STATUS_FSFREQ_RETRY;
 988                 break;
 989         case FSF_PORT_HANDLE_NOT_VALID:
 990                 zfcp_erp_adapter_reopen(adapter, 0, "fsscth1", req);
 991         case FSF_GENERIC_COMMAND_REJECTED:
 992         case FSF_PAYLOAD_SIZE_MISMATCH:
 993         case FSF_REQUEST_SIZE_TOO_LARGE:
 994         case FSF_RESPONSE_SIZE_TOO_LARGE:
 995         case FSF_SBAL_MISMATCH:
 996                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 997                 break;
 998         }
 999
1000 skip_fsfstatus:
1001         if (send_ct->handler)
1002                 send_ct->handler(send_ct->handler_data);
1003 }
1004
1005 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1006                                        struct scatterlist *sg_req,
1007                                        struct scatterlist *sg_resp,
1008                                        int max_sbals)
1009 {
1010         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(req);
1011         u32 feat = req->adapter->adapter_features;
1012         int bytes;
1013
1014         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1015                 if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
1016                     !sg_is_last(sg_req) || !sg_is_last(sg_resp))
1017                         return -EOPNOTSUPP;
1018
1019                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1020                 sbale[2].addr   = sg_virt(sg_req);
1021                 sbale[2].length = sg_req->length;
1022                 sbale[3].addr   = sg_virt(sg_resp);
1023                 sbale[3].length = sg_resp->length;
1024                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1025                 return 0;
1026         }
1027
1028         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1029                                         sg_req, max_sbals);
1030         if (bytes <= 0)
1031                 return -ENOMEM;
1032         req->qtcb->bottom.support.req_buf_length = bytes;
1033         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1034
1035         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1036                                         sg_resp, max_sbals);
1037         if (bytes <= 0)
1038                 return -ENOMEM;
1039         req->qtcb->bottom.support.resp_buf_length = bytes;
1040
1041         return 0;
1042 }
1043
1044 /**
1045  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1046  * @ct: pointer to struct zfcp_send_ct with data for request
1047  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1048  * @erp_action: if non-null the Generic Service request sent within ERP
1049  */
1050 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1051                      struct zfcp_erp_action *erp_action)
1052 {
1053         struct zfcp_wka_port *wka_port = ct->wka_port;
1054         struct zfcp_adapter *adapter = wka_port->adapter;
1055         struct zfcp_fsf_req *req;
1056         int ret = -EIO;
1057
1058         spin_lock_bh(&adapter->req_q_lock);
1059         if (zfcp_fsf_req_sbal_get(adapter))
1060                 goto out;
1061
1062         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1063                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1064         if (IS_ERR(req)) {
1065                 ret = PTR_ERR(req);
1066                 goto out;
1067         }
1068
1069         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1070                                           FSF_MAX_SBALS_PER_REQ);
1071         if (ret)
1072                 goto failed_send;
1073
1074         req->handler = zfcp_fsf_send_ct_handler;
1075         req->qtcb->header.port_handle = wka_port->handle;
1076         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1077         req->qtcb->bottom.support.timeout = ct->timeout;
1078         req->data = ct;
1079
1080         zfcp_san_dbf_event_ct_request(req);
1081
1082         if (erp_action) {
1083                 erp_action->fsf_req = req;
1084                 req->erp_action = erp_action;
1085                 zfcp_fsf_start_erp_timer(req);
1086         } else
1087                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1088
1089         ret = zfcp_fsf_req_send(req);
1090         if (ret)
1091                 goto failed_send;
1092
1093         goto out;
1094
1095 failed_send:
1096         zfcp_fsf_req_free(req);
1097         if (erp_action)
1098                 erp_action->fsf_req = NULL;
1099 out:
1100         spin_unlock_bh(&adapter->req_q_lock);
1101         return ret;
1102 }
1103
1104 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1105 {
1106         struct zfcp_send_els *send_els = req->data;
1107         struct zfcp_port *port = send_els->port;
1108         struct fsf_qtcb_header *header = &req->qtcb->header;
1109
1110         send_els->status = -EINVAL;
1111
1112         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1113                 goto skip_fsfstatus;
1114
1115         switch (header->fsf_status) {
1116         case FSF_GOOD:
1117                 zfcp_san_dbf_event_els_response(req);
1118                 send_els->status = 0;
1119                 break;
1120         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1121                 zfcp_fsf_class_not_supp(req);
1122                 break;
1123         case FSF_ADAPTER_STATUS_AVAILABLE:
1124                 switch (header->fsf_status_qual.word[0]){
1125                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1126                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1127                                 zfcp_test_link(port);
1128                         /*fall through */
1129                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1130                 case FSF_SQ_RETRY_IF_POSSIBLE:
1131                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1132                         break;
1133                 }
1134                 break;
1135         case FSF_ELS_COMMAND_REJECTED:
1136         case FSF_PAYLOAD_SIZE_MISMATCH:
1137         case FSF_REQUEST_SIZE_TOO_LARGE:
1138         case FSF_RESPONSE_SIZE_TOO_LARGE:
1139                 break;
1140         case FSF_ACCESS_DENIED:
1141                 zfcp_fsf_access_denied_port(req, port);
1142                 break;
1143         case FSF_SBAL_MISMATCH:
1144                 /* should never occure, avoided in zfcp_fsf_send_els */
1145                 /* fall through */
1146         default:
1147                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1148                 break;
1149         }
1150 skip_fsfstatus:
1151         if (send_els->handler)
1152                 send_els->handler(send_els->handler_data);
1153 }
1154
1155 /**
1156  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1157  * @els: pointer to struct zfcp_send_els with data for the command
1158  */
1159 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1160 {
1161         struct zfcp_fsf_req *req;
1162         struct zfcp_adapter *adapter = els->adapter;
1163         struct fsf_qtcb_bottom_support *bottom;
1164         int ret = -EIO;
1165
1166         spin_lock_bh(&adapter->req_q_lock);
1167         if (zfcp_fsf_req_sbal_get(adapter))
1168                 goto out;
1169         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1170                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1171         if (IS_ERR(req)) {
1172                 ret = PTR_ERR(req);
1173                 goto out;
1174         }
1175
1176         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1177
1178         if (ret)
1179                 goto failed_send;
1180
1181         bottom = &req->qtcb->bottom.support;
1182         req->handler = zfcp_fsf_send_els_handler;
1183         bottom->d_id = els->d_id;
1184         bottom->service_class = FSF_CLASS_3;
1185         bottom->timeout = 2 * R_A_TOV;
1186         req->data = els;
1187
1188         zfcp_san_dbf_event_els_request(req);
1189
1190         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1191         ret = zfcp_fsf_req_send(req);
1192         if (ret)
1193                 goto failed_send;
1194
1195         goto out;
1196
1197 failed_send:
1198         zfcp_fsf_req_free(req);
1199 out:
1200         spin_unlock_bh(&adapter->req_q_lock);
1201         return ret;
1202 }
1203
1204 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1205 {
1206         struct qdio_buffer_element *sbale;
1207         struct zfcp_fsf_req *req;
1208         struct zfcp_adapter *adapter = erp_action->adapter;
1209         int retval = -EIO;
1210
1211         spin_lock_bh(&adapter->req_q_lock);
1212         if (zfcp_fsf_req_sbal_get(adapter))
1213                 goto out;
1214         req = zfcp_fsf_req_create(adapter,
1215                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1216                                   ZFCP_REQ_AUTO_CLEANUP,
1217                                   adapter->pool.fsf_req_erp);
1218         if (IS_ERR(req)) {
1219                 retval = PTR_ERR(req);
1220                 goto out;
1221         }
1222
1223         sbale = zfcp_qdio_sbale_req(req);
1224         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1225         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1226
1227         req->qtcb->bottom.config.feature_selection =
1228                         FSF_FEATURE_CFDC |
1229                         FSF_FEATURE_LUN_SHARING |
1230                         FSF_FEATURE_NOTIFICATION_LOST |
1231                         FSF_FEATURE_UPDATE_ALERT;
1232         req->erp_action = erp_action;
1233         req->handler = zfcp_fsf_exchange_config_data_handler;
1234         erp_action->fsf_req = req;
1235
1236         zfcp_fsf_start_erp_timer(req);
1237         retval = zfcp_fsf_req_send(req);
1238         if (retval) {
1239                 zfcp_fsf_req_free(req);
1240                 erp_action->fsf_req = NULL;
1241         }
1242 out:
1243         spin_unlock_bh(&adapter->req_q_lock);
1244         return retval;
1245 }
1246
1247 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1248                                        struct fsf_qtcb_bottom_config *data)
1249 {
1250         struct qdio_buffer_element *sbale;
1251         struct zfcp_fsf_req *req = NULL;
1252         int retval = -EIO;
1253
1254         spin_lock_bh(&adapter->req_q_lock);
1255         if (zfcp_fsf_req_sbal_get(adapter))
1256                 goto out;
1257
1258         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1259                                   0, NULL);
1260         if (IS_ERR(req)) {
1261                 retval = PTR_ERR(req);
1262                 goto out;
1263         }
1264
1265         sbale = zfcp_qdio_sbale_req(req);
1266         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1267         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1268         req->handler = zfcp_fsf_exchange_config_data_handler;
1269
1270         req->qtcb->bottom.config.feature_selection =
1271                         FSF_FEATURE_CFDC |
1272                         FSF_FEATURE_LUN_SHARING |
1273                         FSF_FEATURE_NOTIFICATION_LOST |
1274                         FSF_FEATURE_UPDATE_ALERT;
1275
1276         if (data)
1277                 req->data = data;
1278
1279         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1280         retval = zfcp_fsf_req_send(req);
1281 out:
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
1289         return retval;
1290 }
1291
1292 /**
1293  * zfcp_fsf_exchange_port_data - request information about local port
1294  * @erp_action: ERP action for the adapter for which port data is requested
1295  * Returns: 0 on success, error otherwise
1296  */
1297 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1298 {
1299         struct qdio_buffer_element *sbale;
1300         struct zfcp_fsf_req *req;
1301         struct zfcp_adapter *adapter = erp_action->adapter;
1302         int retval = -EIO;
1303
1304         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1305                 return -EOPNOTSUPP;
1306
1307         spin_lock_bh(&adapter->req_q_lock);
1308         if (zfcp_fsf_req_sbal_get(adapter))
1309                 goto out;
1310         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1311                                   ZFCP_REQ_AUTO_CLEANUP,
1312                                   adapter->pool.fsf_req_erp);
1313         if (IS_ERR(req)) {
1314                 retval = PTR_ERR(req);
1315                 goto out;
1316         }
1317
1318         sbale = zfcp_qdio_sbale_req(req);
1319         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1320         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1321
1322         req->handler = zfcp_fsf_exchange_port_data_handler;
1323         req->erp_action = erp_action;
1324         erp_action->fsf_req = req;
1325
1326         zfcp_fsf_start_erp_timer(req);
1327         retval = zfcp_fsf_req_send(req);
1328         if (retval) {
1329                 zfcp_fsf_req_free(req);
1330                 erp_action->fsf_req = NULL;
1331         }
1332 out:
1333         spin_unlock_bh(&adapter->req_q_lock);
1334         return retval;
1335 }
1336
1337 /**
1338  * zfcp_fsf_exchange_port_data_sync - request information about local port
1339  * @adapter: pointer to struct zfcp_adapter
1340  * @data: pointer to struct fsf_qtcb_bottom_port
1341  * Returns: 0 on success, error otherwise
1342  */
1343 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1344                                      struct fsf_qtcb_bottom_port *data)
1345 {
1346         struct qdio_buffer_element *sbale;
1347         struct zfcp_fsf_req *req = NULL;
1348         int retval = -EIO;
1349
1350         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1351                 return -EOPNOTSUPP;
1352
1353         spin_lock_bh(&adapter->req_q_lock);
1354         if (zfcp_fsf_req_sbal_get(adapter))
1355                 goto out;
1356
1357         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1358                                   NULL);
1359         if (IS_ERR(req)) {
1360                 retval = PTR_ERR(req);
1361                 goto out;
1362         }
1363
1364         if (data)
1365                 req->data = data;
1366
1367         sbale = zfcp_qdio_sbale_req(req);
1368         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1369         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1370
1371         req->handler = zfcp_fsf_exchange_port_data_handler;
1372         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1373         retval = zfcp_fsf_req_send(req);
1374 out:
1375         spin_unlock_bh(&adapter->req_q_lock);
1376         if (!retval)
1377                 wait_event(req->completion_wq,
1378                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1379         zfcp_fsf_req_free(req);
1380
1381         return retval;
1382 }
1383
1384 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1385 {
1386         struct zfcp_port *port = req->data;
1387         struct fsf_qtcb_header *header = &req->qtcb->header;
1388         struct fsf_plogi *plogi;
1389
1390         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1391                 return;
1392
1393         switch (header->fsf_status) {
1394         case FSF_PORT_ALREADY_OPEN:
1395                 break;
1396         case FSF_ACCESS_DENIED:
1397                 zfcp_fsf_access_denied_port(req, port);
1398                 break;
1399         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1400                 dev_warn(&req->adapter->ccw_device->dev,
1401                          "Not enough FCP adapter resources to open "
1402                          "remote port 0x%016Lx\n",
1403                          (unsigned long long)port->wwpn);
1404                 zfcp_erp_port_failed(port, "fsoph_1", req);
1405                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1406                 break;
1407         case FSF_ADAPTER_STATUS_AVAILABLE:
1408                 switch (header->fsf_status_qual.word[0]) {
1409                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1410                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1411                 case FSF_SQ_NO_RETRY_POSSIBLE:
1412                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1413                         break;
1414                 }
1415                 break;
1416         case FSF_GOOD:
1417                 port->handle = header->port_handle;
1418                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1419                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1420                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1421                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1422                                   &port->status);
1423                 /* check whether D_ID has changed during open */
1424                 /*
1425                  * FIXME: This check is not airtight, as the FCP channel does
1426                  * not monitor closures of target port connections caused on
1427                  * the remote side. Thus, they might miss out on invalidating
1428                  * locally cached WWPNs (and other N_Port parameters) of gone
1429                  * target ports. So, our heroic attempt to make things safe
1430                  * could be undermined by 'open port' response data tagged with
1431                  * obsolete WWPNs. Another reason to monitor potential
1432                  * connection closures ourself at least (by interpreting
1433                  * incoming ELS' and unsolicited status). It just crosses my
1434                  * mind that one should be able to cross-check by means of
1435                  * another GID_PN straight after a port has been opened.
1436                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1437                  */
1438                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1439                 if (req->qtcb->bottom.support.els1_length >=
1440                     FSF_PLOGI_MIN_LEN) {
1441                         if (plogi->serv_param.wwpn != port->wwpn)
1442                                 port->d_id = 0;
1443                         else {
1444                                 port->wwnn = plogi->serv_param.wwnn;
1445                                 zfcp_fc_plogi_evaluate(port, plogi);
1446                         }
1447                 }
1448                 break;
1449         case FSF_UNKNOWN_OP_SUBTYPE:
1450                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1451                 break;
1452         }
1453 }
1454
1455 /**
1456  * zfcp_fsf_open_port - create and send open port request
1457  * @erp_action: pointer to struct zfcp_erp_action
1458  * Returns: 0 on success, error otherwise
1459  */
1460 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1461 {
1462         struct qdio_buffer_element *sbale;
1463         struct zfcp_adapter *adapter = erp_action->adapter;
1464         struct zfcp_fsf_req *req;
1465         int retval = -EIO;
1466
1467         spin_lock_bh(&adapter->req_q_lock);
1468         if (zfcp_fsf_req_sbal_get(adapter))
1469                 goto out;
1470
1471         req = zfcp_fsf_req_create(adapter,
1472                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1473                                   ZFCP_REQ_AUTO_CLEANUP,
1474                                   adapter->pool.fsf_req_erp);
1475         if (IS_ERR(req)) {
1476                 retval = PTR_ERR(req);
1477                 goto out;
1478         }
1479
1480         sbale = zfcp_qdio_sbale_req(req);
1481         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1482         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1483
1484         req->handler = zfcp_fsf_open_port_handler;
1485         req->qtcb->bottom.support.d_id = erp_action->port->d_id;
1486         req->data = erp_action->port;
1487         req->erp_action = erp_action;
1488         erp_action->fsf_req = req;
1489
1490         zfcp_fsf_start_erp_timer(req);
1491         retval = zfcp_fsf_req_send(req);
1492         if (retval) {
1493                 zfcp_fsf_req_free(req);
1494                 erp_action->fsf_req = NULL;
1495         }
1496 out:
1497         spin_unlock_bh(&adapter->req_q_lock);
1498         return retval;
1499 }
1500
1501 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1502 {
1503         struct zfcp_port *port = req->data;
1504
1505         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1506                 return;
1507
1508         switch (req->qtcb->header.fsf_status) {
1509         case FSF_PORT_HANDLE_NOT_VALID:
1510                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1", req);
1511                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1512                 break;
1513         case FSF_ADAPTER_STATUS_AVAILABLE:
1514                 break;
1515         case FSF_GOOD:
1516                 zfcp_erp_modify_port_status(port, "fscph_2", req,
1517                                             ZFCP_STATUS_COMMON_OPEN,
1518                                             ZFCP_CLEAR);
1519                 break;
1520         }
1521 }
1522
1523 /**
1524  * zfcp_fsf_close_port - create and send close port request
1525  * @erp_action: pointer to struct zfcp_erp_action
1526  * Returns: 0 on success, error otherwise
1527  */
1528 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1529 {
1530         struct qdio_buffer_element *sbale;
1531         struct zfcp_adapter *adapter = erp_action->adapter;
1532         struct zfcp_fsf_req *req;
1533         int retval = -EIO;
1534
1535         spin_lock_bh(&adapter->req_q_lock);
1536         if (zfcp_fsf_req_sbal_get(adapter))
1537                 goto out;
1538
1539         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1540                                   ZFCP_REQ_AUTO_CLEANUP,
1541                                   adapter->pool.fsf_req_erp);
1542         if (IS_ERR(req)) {
1543                 retval = PTR_ERR(req);
1544                 goto out;
1545         }
1546
1547         sbale = zfcp_qdio_sbale_req(req);
1548         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1549         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1550
1551         req->handler = zfcp_fsf_close_port_handler;
1552         req->data = erp_action->port;
1553         req->erp_action = erp_action;
1554         req->qtcb->header.port_handle = erp_action->port->handle;
1555         erp_action->fsf_req = req;
1556
1557         zfcp_fsf_start_erp_timer(req);
1558         retval = zfcp_fsf_req_send(req);
1559         if (retval) {
1560                 zfcp_fsf_req_free(req);
1561                 erp_action->fsf_req = NULL;
1562         }
1563 out:
1564         spin_unlock_bh(&adapter->req_q_lock);
1565         return retval;
1566 }
1567
1568 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1569 {
1570         struct zfcp_wka_port *wka_port = req->data;
1571         struct fsf_qtcb_header *header = &req->qtcb->header;
1572
1573         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1574                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1575                 goto out;
1576         }
1577
1578         switch (header->fsf_status) {
1579         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1580                 dev_warn(&req->adapter->ccw_device->dev,
1581                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1582         case FSF_ADAPTER_STATUS_AVAILABLE:
1583                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1584         case FSF_ACCESS_DENIED:
1585                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1586                 break;
1587         case FSF_PORT_ALREADY_OPEN:
1588                 break;
1589         case FSF_GOOD:
1590                 wka_port->handle = header->port_handle;
1591                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1592         }
1593 out:
1594         wake_up(&wka_port->completion_wq);
1595 }
1596
1597 /**
1598  * zfcp_fsf_open_wka_port - create and send open wka-port request
1599  * @wka_port: pointer to struct zfcp_wka_port
1600  * Returns: 0 on success, error otherwise
1601  */
1602 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1603 {
1604         struct qdio_buffer_element *sbale;
1605         struct zfcp_adapter *adapter = wka_port->adapter;
1606         struct zfcp_fsf_req *req;
1607         int retval = -EIO;
1608
1609         spin_lock_bh(&adapter->req_q_lock);
1610         if (zfcp_fsf_req_sbal_get(adapter))
1611                 goto out;
1612
1613         req = zfcp_fsf_req_create(adapter,
1614                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1615                                   ZFCP_REQ_AUTO_CLEANUP,
1616                                   adapter->pool.fsf_req_erp);
1617         if (unlikely(IS_ERR(req))) {
1618                 retval = PTR_ERR(req);
1619                 goto out;
1620         }
1621
1622         sbale = zfcp_qdio_sbale_req(req);
1623         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1624         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1625
1626         req->handler = zfcp_fsf_open_wka_port_handler;
1627         req->qtcb->bottom.support.d_id = wka_port->d_id;
1628         req->data = wka_port;
1629
1630         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1631         retval = zfcp_fsf_req_send(req);
1632         if (retval)
1633                 zfcp_fsf_req_free(req);
1634 out:
1635         spin_unlock_bh(&adapter->req_q_lock);
1636         return retval;
1637 }
1638
1639 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1640 {
1641         struct zfcp_wka_port *wka_port = req->data;
1642
1643         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1644                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1645                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1", req);
1646         }
1647
1648         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1649         wake_up(&wka_port->completion_wq);
1650 }
1651
1652 /**
1653  * zfcp_fsf_close_wka_port - create and send close wka port request
1654  * @erp_action: pointer to struct zfcp_erp_action
1655  * Returns: 0 on success, error otherwise
1656  */
1657 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1658 {
1659         struct qdio_buffer_element *sbale;
1660         struct zfcp_adapter *adapter = wka_port->adapter;
1661         struct zfcp_fsf_req *req;
1662         int retval = -EIO;
1663
1664         spin_lock_bh(&adapter->req_q_lock);
1665         if (zfcp_fsf_req_sbal_get(adapter))
1666                 goto out;
1667
1668         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1669                                   ZFCP_REQ_AUTO_CLEANUP,
1670                                   adapter->pool.fsf_req_erp);
1671         if (unlikely(IS_ERR(req))) {
1672                 retval = PTR_ERR(req);
1673                 goto out;
1674         }
1675
1676         sbale = zfcp_qdio_sbale_req(req);
1677         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1678         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1679
1680         req->handler = zfcp_fsf_close_wka_port_handler;
1681         req->data = wka_port;
1682         req->qtcb->header.port_handle = wka_port->handle;
1683
1684         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1685         retval = zfcp_fsf_req_send(req);
1686         if (retval)
1687                 zfcp_fsf_req_free(req);
1688 out:
1689         spin_unlock_bh(&adapter->req_q_lock);
1690         return retval;
1691 }
1692
1693 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1694 {
1695         struct zfcp_port *port = req->data;
1696         struct fsf_qtcb_header *header = &req->qtcb->header;
1697         struct zfcp_unit *unit;
1698
1699         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1700                 return;
1701
1702         switch (header->fsf_status) {
1703         case FSF_PORT_HANDLE_NOT_VALID:
1704                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1", req);
1705                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1706                 break;
1707         case FSF_ACCESS_DENIED:
1708                 zfcp_fsf_access_denied_port(req, port);
1709                 break;
1710         case FSF_PORT_BOXED:
1711                 zfcp_erp_port_boxed(port, "fscpph2", req);
1712                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1713                                ZFCP_STATUS_FSFREQ_RETRY;
1714                 /* can't use generic zfcp_erp_modify_port_status because
1715                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1716                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1717                 list_for_each_entry(unit, &port->unit_list_head, list)
1718                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1719                                           &unit->status);
1720                 break;
1721         case FSF_ADAPTER_STATUS_AVAILABLE:
1722                 switch (header->fsf_status_qual.word[0]) {
1723                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1724                         /* fall through */
1725                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1726                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1727                         break;
1728                 }
1729                 break;
1730         case FSF_GOOD:
1731                 /* can't use generic zfcp_erp_modify_port_status because
1732                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1733                  */
1734                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1735                 list_for_each_entry(unit, &port->unit_list_head, list)
1736                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1737                                           &unit->status);
1738                 break;
1739         }
1740 }
1741
1742 /**
1743  * zfcp_fsf_close_physical_port - close physical port
1744  * @erp_action: pointer to struct zfcp_erp_action
1745  * Returns: 0 on success
1746  */
1747 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1748 {
1749         struct qdio_buffer_element *sbale;
1750         struct zfcp_adapter *adapter = erp_action->adapter;
1751         struct zfcp_fsf_req *req;
1752         int retval = -EIO;
1753
1754         spin_lock_bh(&adapter->req_q_lock);
1755         if (zfcp_fsf_req_sbal_get(adapter))
1756                 goto out;
1757
1758         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1759                                   ZFCP_REQ_AUTO_CLEANUP,
1760                                   adapter->pool.fsf_req_erp);
1761         if (IS_ERR(req)) {
1762                 retval = PTR_ERR(req);
1763                 goto out;
1764         }
1765
1766         sbale = zfcp_qdio_sbale_req(req);
1767         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1768         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1769
1770         req->data = erp_action->port;
1771         req->qtcb->header.port_handle = erp_action->port->handle;
1772         req->erp_action = erp_action;
1773         req->handler = zfcp_fsf_close_physical_port_handler;
1774         erp_action->fsf_req = req;
1775
1776         zfcp_fsf_start_erp_timer(req);
1777         retval = zfcp_fsf_req_send(req);
1778         if (retval) {
1779                 zfcp_fsf_req_free(req);
1780                 erp_action->fsf_req = NULL;
1781         }
1782 out:
1783         spin_unlock_bh(&adapter->req_q_lock);
1784         return retval;
1785 }
1786
1787 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1788 {
1789         struct zfcp_adapter *adapter = req->adapter;
1790         struct zfcp_unit *unit = req->data;
1791         struct fsf_qtcb_header *header = &req->qtcb->header;
1792         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1793         struct fsf_queue_designator *queue_designator =
1794                                 &header->fsf_status_qual.fsf_queue_designator;
1795         int exclusive, readwrite;
1796
1797         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1798                 return;
1799
1800         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1801                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1802                           ZFCP_STATUS_UNIT_SHARED |
1803                           ZFCP_STATUS_UNIT_READONLY,
1804                           &unit->status);
1805
1806         switch (header->fsf_status) {
1807
1808         case FSF_PORT_HANDLE_NOT_VALID:
1809                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fsouh_1", req);
1810                 /* fall through */
1811         case FSF_LUN_ALREADY_OPEN:
1812                 break;
1813         case FSF_ACCESS_DENIED:
1814                 zfcp_fsf_access_denied_unit(req, unit);
1815                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1816                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1817                 break;
1818         case FSF_PORT_BOXED:
1819                 zfcp_erp_port_boxed(unit->port, "fsouh_2", req);
1820                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1821                                ZFCP_STATUS_FSFREQ_RETRY;
1822                 break;
1823         case FSF_LUN_SHARING_VIOLATION:
1824                 if (header->fsf_status_qual.word[0])
1825                         dev_warn(&adapter->ccw_device->dev,
1826                                  "LUN 0x%Lx on port 0x%Lx is already in "
1827                                  "use by CSS%d, MIF Image ID %x\n",
1828                                  (unsigned long long)unit->fcp_lun,
1829                                  (unsigned long long)unit->port->wwpn,
1830                                  queue_designator->cssid,
1831                                  queue_designator->hla);
1832                 else
1833                         zfcp_act_eval_err(adapter,
1834                                           header->fsf_status_qual.word[2]);
1835                 zfcp_erp_unit_access_denied(unit, "fsouh_3", req);
1836                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1837                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1838                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1839                 break;
1840         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1841                 dev_warn(&adapter->ccw_device->dev,
1842                          "No handle is available for LUN "
1843                          "0x%016Lx on port 0x%016Lx\n",
1844                          (unsigned long long)unit->fcp_lun,
1845                          (unsigned long long)unit->port->wwpn);
1846                 zfcp_erp_unit_failed(unit, "fsouh_4", req);
1847                 /* fall through */
1848         case FSF_INVALID_COMMAND_OPTION:
1849                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1850                 break;
1851         case FSF_ADAPTER_STATUS_AVAILABLE:
1852                 switch (header->fsf_status_qual.word[0]) {
1853                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1854                         zfcp_test_link(unit->port);
1855                         /* fall through */
1856                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1857                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1858                         break;
1859                 }
1860                 break;
1861
1862         case FSF_GOOD:
1863                 unit->handle = header->lun_handle;
1864                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1865
1866                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1867                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1868                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1869                         exclusive = (bottom->lun_access_info &
1870                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1871                         readwrite = (bottom->lun_access_info &
1872                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1873
1874                         if (!exclusive)
1875                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1876                                                 &unit->status);
1877
1878                         if (!readwrite) {
1879                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1880                                                 &unit->status);
1881                                 dev_info(&adapter->ccw_device->dev,
1882                                          "SCSI device at LUN 0x%016Lx on port "
1883                                          "0x%016Lx opened read-only\n",
1884                                          (unsigned long long)unit->fcp_lun,
1885                                          (unsigned long long)unit->port->wwpn);
1886                         }
1887
1888                         if (exclusive && !readwrite) {
1889                                 dev_err(&adapter->ccw_device->dev,
1890                                         "Exclusive read-only access not "
1891                                         "supported (unit 0x%016Lx, "
1892                                         "port 0x%016Lx)\n",
1893                                         (unsigned long long)unit->fcp_lun,
1894                                         (unsigned long long)unit->port->wwpn);
1895                                 zfcp_erp_unit_failed(unit, "fsouh_5", req);
1896                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1897                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_6", req);
1898                         } else if (!exclusive && readwrite) {
1899                                 dev_err(&adapter->ccw_device->dev,
1900                                         "Shared read-write access not "
1901                                         "supported (unit 0x%016Lx, port "
1902                                         "0x%016Lx)\n",
1903                                         (unsigned long long)unit->fcp_lun,
1904                                         (unsigned long long)unit->port->wwpn);
1905                                 zfcp_erp_unit_failed(unit, "fsouh_7", req);
1906                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1907                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_8", req);
1908                         }
1909                 }
1910                 break;
1911         }
1912 }
1913
1914 /**
1915  * zfcp_fsf_open_unit - open unit
1916  * @erp_action: pointer to struct zfcp_erp_action
1917  * Returns: 0 on success, error otherwise
1918  */
1919 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1920 {
1921         struct qdio_buffer_element *sbale;
1922         struct zfcp_adapter *adapter = erp_action->adapter;
1923         struct zfcp_fsf_req *req;
1924         int retval = -EIO;
1925
1926         spin_lock_bh(&adapter->req_q_lock);
1927         if (zfcp_fsf_req_sbal_get(adapter))
1928                 goto out;
1929
1930         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1931                                   ZFCP_REQ_AUTO_CLEANUP,
1932                                   adapter->pool.fsf_req_erp);
1933         if (IS_ERR(req)) {
1934                 retval = PTR_ERR(req);
1935                 goto out;
1936         }
1937
1938         sbale = zfcp_qdio_sbale_req(req);
1939         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1940         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1941
1942         req->qtcb->header.port_handle = erp_action->port->handle;
1943         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1944         req->handler = zfcp_fsf_open_unit_handler;
1945         req->data = erp_action->unit;
1946         req->erp_action = erp_action;
1947         erp_action->fsf_req = req;
1948
1949         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1950                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1951
1952         zfcp_fsf_start_erp_timer(req);
1953         retval = zfcp_fsf_req_send(req);
1954         if (retval) {
1955                 zfcp_fsf_req_free(req);
1956                 erp_action->fsf_req = NULL;
1957         }
1958 out:
1959         spin_unlock_bh(&adapter->req_q_lock);
1960         return retval;
1961 }
1962
1963 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1964 {
1965         struct zfcp_unit *unit = req->data;
1966
1967         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1968                 return;
1969
1970         switch (req->qtcb->header.fsf_status) {
1971         case FSF_PORT_HANDLE_NOT_VALID:
1972                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fscuh_1", req);
1973                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1974                 break;
1975         case FSF_LUN_HANDLE_NOT_VALID:
1976                 zfcp_erp_port_reopen(unit->port, 0, "fscuh_2", req);
1977                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1978                 break;
1979         case FSF_PORT_BOXED:
1980                 zfcp_erp_port_boxed(unit->port, "fscuh_3", req);
1981                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1982                                ZFCP_STATUS_FSFREQ_RETRY;
1983                 break;
1984         case FSF_ADAPTER_STATUS_AVAILABLE:
1985                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
1986                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1987                         zfcp_test_link(unit->port);
1988                         /* fall through */
1989                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1990                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1991                         break;
1992                 }
1993                 break;
1994         case FSF_GOOD:
1995                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1996                 break;
1997         }
1998 }
1999
2000 /**
2001  * zfcp_fsf_close_unit - close zfcp unit
2002  * @erp_action: pointer to struct zfcp_unit
2003  * Returns: 0 on success, error otherwise
2004  */
2005 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2006 {
2007         struct qdio_buffer_element *sbale;
2008         struct zfcp_adapter *adapter = erp_action->adapter;
2009         struct zfcp_fsf_req *req;
2010         int retval = -EIO;
2011
2012         spin_lock_bh(&adapter->req_q_lock);
2013         if (zfcp_fsf_req_sbal_get(adapter))
2014                 goto out;
2015         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2016                                   ZFCP_REQ_AUTO_CLEANUP,
2017                                   adapter->pool.fsf_req_erp);
2018         if (IS_ERR(req)) {
2019                 retval = PTR_ERR(req);
2020                 goto out;
2021         }
2022
2023         sbale = zfcp_qdio_sbale_req(req);
2024         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2025         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2026
2027         req->qtcb->header.port_handle = erp_action->port->handle;
2028         req->qtcb->header.lun_handle = erp_action->unit->handle;
2029         req->handler = zfcp_fsf_close_unit_handler;
2030         req->data = erp_action->unit;
2031         req->erp_action = erp_action;
2032         erp_action->fsf_req = req;
2033
2034         zfcp_fsf_start_erp_timer(req);
2035         retval = zfcp_fsf_req_send(req);
2036         if (retval) {
2037                 zfcp_fsf_req_free(req);
2038                 erp_action->fsf_req = NULL;
2039         }
2040 out:
2041         spin_unlock_bh(&adapter->req_q_lock);
2042         return retval;
2043 }
2044
2045 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2046 {
2047         lat_rec->sum += lat;
2048         lat_rec->min = min(lat_rec->min, lat);
2049         lat_rec->max = max(lat_rec->max, lat);
2050 }
2051
2052 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2053 {
2054         struct fsf_qual_latency_info *lat_inf;
2055         struct latency_cont *lat;
2056         struct zfcp_unit *unit = req->unit;
2057
2058         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2059
2060         switch (req->qtcb->bottom.io.data_direction) {
2061         case FSF_DATADIR_READ:
2062                 lat = &unit->latencies.read;
2063                 break;
2064         case FSF_DATADIR_WRITE:
2065                 lat = &unit->latencies.write;
2066                 break;
2067         case FSF_DATADIR_CMND:
2068                 lat = &unit->latencies.cmd;
2069                 break;
2070         default:
2071                 return;
2072         }
2073
2074         spin_lock(&unit->latencies.lock);
2075         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2076         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2077         lat->counter++;
2078         spin_unlock(&unit->latencies.lock);
2079 }
2080
2081 #ifdef CONFIG_BLK_DEV_IO_TRACE
2082 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2083 {
2084         struct fsf_qual_latency_info *lat_inf;
2085         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2086         struct request *req = scsi_cmnd->request;
2087         struct zfcp_blk_drv_data trace;
2088         int ticks = fsf_req->adapter->timer_ticks;
2089
2090         trace.flags = 0;
2091         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2092         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2093                 trace.flags |= ZFCP_BLK_LAT_VALID;
2094                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2095                 trace.channel_lat = lat_inf->channel_lat * ticks;
2096                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2097         }
2098         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2099                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2100         trace.inb_usage = fsf_req->qdio_inb_usage;
2101         trace.outb_usage = fsf_req->qdio_outb_usage;
2102
2103         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2104 }
2105 #else
2106 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2107 {
2108 }
2109 #endif
2110
2111 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2112 {
2113         struct scsi_cmnd *scpnt;
2114         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2115             &(req->qtcb->bottom.io.fcp_rsp);
2116         u32 sns_len;
2117         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2118         unsigned long flags;
2119
2120         read_lock_irqsave(&req->adapter->abort_lock, flags);
2121
2122         scpnt = req->data;
2123         if (unlikely(!scpnt)) {
2124                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2125                 return;
2126         }
2127
2128         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2129                 set_host_byte(scpnt, DID_SOFT_ERROR);
2130                 goto skip_fsfstatus;
2131         }
2132
2133         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2134                 set_host_byte(scpnt, DID_ERROR);
2135                 goto skip_fsfstatus;
2136         }
2137
2138         set_msg_byte(scpnt, COMMAND_COMPLETE);
2139
2140         scpnt->result |= fcp_rsp_iu->scsi_status;
2141
2142         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2143                 zfcp_fsf_req_latency(req);
2144
2145         zfcp_fsf_trace_latency(req);
2146
2147         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2148                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2149                         set_host_byte(scpnt, DID_OK);
2150                 else {
2151                         set_host_byte(scpnt, DID_ERROR);
2152                         goto skip_fsfstatus;
2153                 }
2154         }
2155
2156         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2157                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2158                           fcp_rsp_iu->fcp_rsp_len;
2159                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2160                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2161
2162                 memcpy(scpnt->sense_buffer,
2163                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2164         }
2165
2166         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2167                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2168                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2169                     scpnt->underflow)
2170                         set_host_byte(scpnt, DID_ERROR);
2171         }
2172 skip_fsfstatus:
2173         if (scpnt->result != 0)
2174                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2175         else if (scpnt->retries > 0)
2176                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2177         else
2178                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2179
2180         scpnt->host_scribble = NULL;
2181         (scpnt->scsi_done) (scpnt);
2182         /*
2183          * We must hold this lock until scsi_done has been called.
2184          * Otherwise we may call scsi_done after abort regarding this
2185          * command has completed.
2186          * Note: scsi_done must not block!
2187          */
2188         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2189 }
2190
2191 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2192 {
2193         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2194             &(req->qtcb->bottom.io.fcp_rsp);
2195         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2196
2197         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2198              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2199                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2200 }
2201
2202
2203 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2204 {
2205         struct zfcp_unit *unit;
2206         struct fsf_qtcb_header *header = &req->qtcb->header;
2207
2208         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2209                 unit = req->data;
2210         else
2211                 unit = req->unit;
2212
2213         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2214                 goto skip_fsfstatus;
2215
2216         switch (header->fsf_status) {
2217         case FSF_HANDLE_MISMATCH:
2218         case FSF_PORT_HANDLE_NOT_VALID:
2219                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fssfch1", req);
2220                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2221                 break;
2222         case FSF_FCPLUN_NOT_VALID:
2223         case FSF_LUN_HANDLE_NOT_VALID:
2224                 zfcp_erp_port_reopen(unit->port, 0, "fssfch2", req);
2225                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2226                 break;
2227         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2228                 zfcp_fsf_class_not_supp(req);
2229                 break;
2230         case FSF_ACCESS_DENIED:
2231                 zfcp_fsf_access_denied_unit(req, unit);
2232                 break;
2233         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2234                 dev_err(&req->adapter->ccw_device->dev,
2235                         "Incorrect direction %d, unit 0x%016Lx on port "
2236                         "0x%016Lx closed\n",
2237                         req->qtcb->bottom.io.data_direction,
2238                         (unsigned long long)unit->fcp_lun,
2239                         (unsigned long long)unit->port->wwpn);
2240                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch3",
2241                                           req);
2242                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2243                 break;
2244         case FSF_CMND_LENGTH_NOT_VALID:
2245                 dev_err(&req->adapter->ccw_device->dev,
2246                         "Incorrect CDB length %d, unit 0x%016Lx on "
2247                         "port 0x%016Lx closed\n",
2248                         req->qtcb->bottom.io.fcp_cmnd_length,
2249                         (unsigned long long)unit->fcp_lun,
2250                         (unsigned long long)unit->port->wwpn);
2251                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch4",
2252                                           req);
2253                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2254                 break;
2255         case FSF_PORT_BOXED:
2256                 zfcp_erp_port_boxed(unit->port, "fssfch5", req);
2257                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2258                                ZFCP_STATUS_FSFREQ_RETRY;
2259                 break;
2260         case FSF_LUN_BOXED:
2261                 zfcp_erp_unit_boxed(unit, "fssfch6", req);
2262                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2263                                ZFCP_STATUS_FSFREQ_RETRY;
2264                 break;
2265         case FSF_ADAPTER_STATUS_AVAILABLE:
2266                 if (header->fsf_status_qual.word[0] ==
2267                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2268                         zfcp_test_link(unit->port);
2269                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2270                 break;
2271         }
2272 skip_fsfstatus:
2273         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2274                 zfcp_fsf_send_fcp_ctm_handler(req);
2275         else {
2276                 zfcp_fsf_send_fcp_command_task_handler(req);
2277                 req->unit = NULL;
2278                 zfcp_unit_put(unit);
2279         }
2280 }
2281
2282 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2283 {
2284         u32 *fcp_dl_ptr;
2285
2286         /*
2287          * fcp_dl_addr = start address of fcp_cmnd structure +
2288          * size of fixed part + size of dynamically sized add_dcp_cdb field
2289          * SEE FCP-2 documentation
2290          */
2291         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2292                         (fcp_cmd->add_fcp_cdb_length << 2));
2293         *fcp_dl_ptr = fcp_dl;
2294 }
2295
2296 /**
2297  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2298  * @unit: unit where command is sent to
2299  * @scsi_cmnd: scsi command to be sent
2300  */
2301 int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
2302                                    struct scsi_cmnd *scsi_cmnd)
2303 {
2304         struct zfcp_fsf_req *req;
2305         struct fcp_cmnd_iu *fcp_cmnd_iu;
2306         unsigned int sbtype;
2307         int real_bytes, retval = -EIO;
2308         struct zfcp_adapter *adapter = unit->port->adapter;
2309
2310         if (unlikely(!(atomic_read(&unit->status) &
2311                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2312                 return -EBUSY;
2313
2314         spin_lock(&adapter->req_q_lock);
2315         if (atomic_read(&adapter->req_q.count) <= 0) {
2316                 atomic_inc(&adapter->qdio_outb_full);
2317                 goto out;
2318         }
2319         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND,
2320                                   ZFCP_REQ_AUTO_CLEANUP,
2321                                   adapter->pool.fsf_req_scsi);
2322         if (IS_ERR(req)) {
2323                 retval = PTR_ERR(req);
2324                 goto out;
2325         }
2326
2327         zfcp_unit_get(unit);
2328         req->unit = unit;
2329         req->data = scsi_cmnd;
2330         req->handler = zfcp_fsf_send_fcp_command_handler;
2331         req->qtcb->header.lun_handle = unit->handle;
2332         req->qtcb->header.port_handle = unit->port->handle;
2333         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2334
2335         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2336
2337         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2338         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2339         /*
2340          * set depending on data direction:
2341          *      data direction bits in SBALE (SB Type)
2342          *      data direction bits in QTCB
2343          *      data direction bits in FCP_CMND IU
2344          */
2345         switch (scsi_cmnd->sc_data_direction) {
2346         case DMA_NONE:
2347                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2348                 sbtype = SBAL_FLAGS0_TYPE_READ;
2349                 break;
2350         case DMA_FROM_DEVICE:
2351                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2352                 sbtype = SBAL_FLAGS0_TYPE_READ;
2353                 fcp_cmnd_iu->rddata = 1;
2354                 break;
2355         case DMA_TO_DEVICE:
2356                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2357                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2358                 fcp_cmnd_iu->wddata = 1;
2359                 break;
2360         case DMA_BIDIRECTIONAL:
2361         default:
2362                 retval = -EIO;
2363                 goto failed_scsi_cmnd;
2364         }
2365
2366         if (likely((scsi_cmnd->device->simple_tags) ||
2367                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2368                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2369                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2370         else
2371                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2372
2373         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2374                 fcp_cmnd_iu->add_fcp_cdb_length =
2375                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2376
2377         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2378
2379         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2380                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2381
2382         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2383                                              scsi_sglist(scsi_cmnd),
2384                                              FSF_MAX_SBALS_PER_REQ);
2385         if (unlikely(real_bytes < 0)) {
2386                 if (req->sbal_number < FSF_MAX_SBALS_PER_REQ)
2387                         retval = -EIO;
2388                 else {
2389                         dev_err(&adapter->ccw_device->dev,
2390                                 "Oversize data package, unit 0x%016Lx "
2391                                 "on port 0x%016Lx closed\n",
2392                                 (unsigned long long)unit->fcp_lun,
2393                                 (unsigned long long)unit->port->wwpn);
2394                         zfcp_erp_unit_shutdown(unit, 0, "fssfct1", req);
2395                         retval = -EINVAL;
2396                 }
2397                 goto failed_scsi_cmnd;
2398         }
2399
2400         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2401
2402         retval = zfcp_fsf_req_send(req);
2403         if (unlikely(retval))
2404                 goto failed_scsi_cmnd;
2405
2406         goto out;
2407
2408 failed_scsi_cmnd:
2409         zfcp_unit_put(unit);
2410         zfcp_fsf_req_free(req);
2411         scsi_cmnd->host_scribble = NULL;
2412 out:
2413         spin_unlock(&adapter->req_q_lock);
2414         return retval;
2415 }
2416
2417 /**
2418  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2419  * @unit: pointer to struct zfcp_unit
2420  * @tm_flags: unsigned byte for task management flags
2421  * Returns: on success pointer to struct fsf_req, NULL otherwise
2422  */
2423 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
2424 {
2425         struct qdio_buffer_element *sbale;
2426         struct zfcp_fsf_req *req = NULL;
2427         struct fcp_cmnd_iu *fcp_cmnd_iu;
2428         struct zfcp_adapter *adapter = unit->port->adapter;
2429
2430         if (unlikely(!(atomic_read(&unit->status) &
2431                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2432                 return NULL;
2433
2434         spin_lock_bh(&adapter->req_q_lock);
2435         if (zfcp_fsf_req_sbal_get(adapter))
2436                 goto out;
2437         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, 0,
2438                                   adapter->pool.fsf_req_scsi);
2439         if (IS_ERR(req)) {
2440                 req = NULL;
2441                 goto out;
2442         }
2443
2444         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2445         req->data = unit;
2446         req->handler = zfcp_fsf_send_fcp_command_handler;
2447         req->qtcb->header.lun_handle = unit->handle;
2448         req->qtcb->header.port_handle = unit->port->handle;
2449         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2450         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2451         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2452                                                 sizeof(u32);
2453
2454         sbale = zfcp_qdio_sbale_req(req);
2455         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2456         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2457
2458         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2459         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2460         fcp_cmnd_iu->task_management_flags = tm_flags;
2461
2462         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2463         if (!zfcp_fsf_req_send(req))
2464                 goto out;
2465
2466         zfcp_fsf_req_free(req);
2467         req = NULL;
2468 out:
2469         spin_unlock_bh(&adapter->req_q_lock);
2470         return req;
2471 }
2472
2473 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2474 {
2475         if (req->qtcb->header.fsf_status != FSF_GOOD)
2476                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2477 }
2478
2479 /**
2480  * zfcp_fsf_control_file - control file upload/download
2481  * @adapter: pointer to struct zfcp_adapter
2482  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2483  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2484  */
2485 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2486                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2487 {
2488         struct qdio_buffer_element *sbale;
2489         struct zfcp_fsf_req *req = NULL;
2490         struct fsf_qtcb_bottom_support *bottom;
2491         int direction, retval = -EIO, bytes;
2492
2493         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2494                 return ERR_PTR(-EOPNOTSUPP);
2495
2496         switch (fsf_cfdc->command) {
2497         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2498                 direction = SBAL_FLAGS0_TYPE_WRITE;
2499                 break;
2500         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2501                 direction = SBAL_FLAGS0_TYPE_READ;
2502                 break;
2503         default:
2504                 return ERR_PTR(-EINVAL);
2505         }
2506
2507         spin_lock_bh(&adapter->req_q_lock);
2508         if (zfcp_fsf_req_sbal_get(adapter))
2509                 goto out;
2510
2511         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2512         if (IS_ERR(req)) {
2513                 retval = -EPERM;
2514                 goto out;
2515         }
2516
2517         req->handler = zfcp_fsf_control_file_handler;
2518
2519         sbale = zfcp_qdio_sbale_req(req);
2520         sbale[0].flags |= direction;
2521
2522         bottom = &req->qtcb->bottom.support;
2523         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2524         bottom->option = fsf_cfdc->option;
2525
2526         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2527                                         FSF_MAX_SBALS_PER_REQ);
2528         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2529                 retval = -ENOMEM;
2530                 zfcp_fsf_req_free(req);
2531                 goto out;
2532         }
2533
2534         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2535         retval = zfcp_fsf_req_send(req);
2536 out:
2537         spin_unlock_bh(&adapter->req_q_lock);
2538
2539         if (!retval) {
2540                 wait_event(req->completion_wq,
2541                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2542                 return req;
2543         }
2544         return ERR_PTR(retval);
2545 }