drivers/s390/scsi/zfcp_fsf.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "zfcp_ext.h"
  23
  24 static int zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *);
  25 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *);
  26 static int zfcp_fsf_open_port_handler(struct zfcp_fsf_req *);
  27 static int zfcp_fsf_close_port_handler(struct zfcp_fsf_req *);
  28 static int zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *);
  29 static int zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *);
  30 static int zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *);
  31 static int zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *);
  32 static int zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *);
  33 static int zfcp_fsf_send_fcp_command_task_management_handler(
  34         struct zfcp_fsf_req *);
  35 static int zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *);
  36 static int zfcp_fsf_status_read_handler(struct zfcp_fsf_req *);
  37 static int zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *);
  38 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *);
  39 static int zfcp_fsf_control_file_handler(struct zfcp_fsf_req *);
  40 static inline int zfcp_fsf_req_sbal_check(
  41         unsigned long *, struct zfcp_qdio_queue *, int);
  42 static inline int zfcp_use_one_sbal(
  43         struct scatterlist *, int, struct scatterlist *, int);
  44 static struct zfcp_fsf_req *zfcp_fsf_req_alloc(mempool_t *, int);
  45 static int zfcp_fsf_req_send(struct zfcp_fsf_req *);
  46 static int zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *);
  47 static int zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *);
  48 static int zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *);
  49 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *, u8,
  50         struct fsf_link_down_info *);
  51 static int zfcp_fsf_req_dispatch(struct zfcp_fsf_req *);
  52
  53 /* association between FSF command and FSF QTCB type */
  54 static u32 fsf_qtcb_type[] = {
  55         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  56         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  57         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  58         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  59         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  60         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  61         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  62         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  63         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  64         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  65         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  66         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  67         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  68 };
  69
  70 static const char zfcp_act_subtable_type[5][8] = {
  71         "unknown", "OS", "WWPN", "DID", "LUN"
  72 };
  73
  74 /****************************************************************/
  75 /*************** FSF related Functions  *************************/
  76 /****************************************************************/
  77
  78 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
  79
  80 /*
  81  * function:    zfcp_fsf_req_alloc
  82  *
  83  * purpose:     Obtains an fsf_req and potentially a qtcb (for all but
  84  *              unsolicited requests) via helper functions
  85  *              Does some initial fsf request set-up.
  86  *
  87  * returns:     pointer to allocated fsf_req if successfull
  88  *              NULL otherwise
  89  *
  90  * locks:       none
  91  *
  92  */
  93 static struct zfcp_fsf_req *
  94 zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
  95 {
  96         size_t size;
  97         void *ptr;
  98         struct zfcp_fsf_req *fsf_req = NULL;
  99
 100         if (req_flags & ZFCP_REQ_NO_QTCB)
 101                 size = sizeof(struct zfcp_fsf_req);
 102         else
 103                 size = sizeof(struct zfcp_fsf_req_qtcb);
 104
 105         if (likely(pool))
 106                 ptr = mempool_alloc(pool, GFP_ATOMIC);
 107         else {
 108                 if (req_flags & ZFCP_REQ_NO_QTCB)
 109                         ptr = kmalloc(size, GFP_ATOMIC);
 110                 else
 111                         ptr = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 112                                                GFP_ATOMIC);
 113         }
 114
 115         if (unlikely(!ptr))
 116                 goto out;
 117
 118         memset(ptr, 0, size);
 119
 120         if (req_flags & ZFCP_REQ_NO_QTCB) {
 121                 fsf_req = (struct zfcp_fsf_req *) ptr;
 122         } else {
 123                 fsf_req = &((struct zfcp_fsf_req_qtcb *) ptr)->fsf_req;
 124                 fsf_req->qtcb = &((struct zfcp_fsf_req_qtcb *) ptr)->qtcb;
 125         }
 126
 127         fsf_req->pool = pool;
 128
 129  out:
 130         return fsf_req;
 131 }
 132
 133 /*
 134  * function:    zfcp_fsf_req_free
 135  *
 136  * purpose:     Frees the memory of an fsf_req (and potentially a qtcb) or
 137  *              returns it into the pool via helper functions.
 138  *
 139  * returns:     sod all
 140  *
 141  * locks:       none
 142  */
 143 void
 144 zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
 145 {
 146         if (likely(fsf_req->pool)) {
 147                 mempool_free(fsf_req, fsf_req->pool);
 148                 return;
 149         }
 150
 151         if (fsf_req->qtcb) {
 152                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, fsf_req);
 153                 return;
 154         }
 155
 156         kfree(fsf_req);
 157 }
 158
 159 /*
 160  * Never ever call this without shutting down the adapter first.
 161  * Otherwise the adapter would continue using and corrupting s390 storage.
 162  * Included BUG_ON() call to ensure this is done.
 163  * ERP is supposed to be the only user of this function.
 164  */
 165 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 166 {
 167         struct zfcp_fsf_req *fsf_req, *tmp;
 168         unsigned long flags;
 169         LIST_HEAD(remove_queue);
 170         unsigned int i;
 171
 172         BUG_ON(atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status));
 173         spin_lock_irqsave(&adapter->req_list_lock, flags);
 174         atomic_set(&adapter->reqs_active, 0);
 175         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 176                 list_splice_init(&adapter->req_list[i], &remove_queue);
 177         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 178
 179         list_for_each_entry_safe(fsf_req, tmp, &remove_queue, list) {
 180                 list_del(&fsf_req->list);
 181                 fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 182                 zfcp_fsf_req_complete(fsf_req);
 183         }
 184 }
 185
 186 /*
 187  * function:    zfcp_fsf_req_complete
 188  *
 189  * purpose:     Updates active counts and timers for openfcp-reqs
 190  *              May cleanup request after req_eval returns
 191  *
 192  * returns:     0 - success
 193  *              !0 - failure
 194  *
 195  * context:
 196  */
 197 int
 198 zfcp_fsf_req_complete(struct zfcp_fsf_req *fsf_req)
 199 {
 200         int retval = 0;
 201         int cleanup;
 202
 203         if (unlikely(fsf_req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 204                 ZFCP_LOG_DEBUG("Status read response received\n");
 205                 /*
 206                  * Note: all cleanup handling is done in the callchain of
 207                  * the function call-chain below.
 208                  */
 209                 zfcp_fsf_status_read_handler(fsf_req);
 210                 goto out;
 211         } else {
 212                 del_timer(&fsf_req->timer);
 213                 zfcp_fsf_protstatus_eval(fsf_req);
 214         }
 215
 216         /*
 217          * fsf_req may be deleted due to waking up functions, so
 218          * cleanup is saved here and used later
 219          */
 220         if (likely(fsf_req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 221                 cleanup = 1;
 222         else
 223                 cleanup = 0;
 224
 225         fsf_req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 226
 227         /* cleanup request if requested by initiator */
 228         if (likely(cleanup)) {
 229                 ZFCP_LOG_TRACE("removing FSF request %p\n", fsf_req);
 230                 /*
 231                  * lock must not be held here since it will be
 232                  * grabed by the called routine, too
 233                  */
 234                 zfcp_fsf_req_free(fsf_req);
 235         } else {
 236                 /* notify initiator waiting for the requests completion */
 237                 ZFCP_LOG_TRACE("waking initiator of FSF request %p\n",fsf_req);
 238                 /*
 239                  * FIXME: Race! We must not access fsf_req here as it might have been
 240                  * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 241                  * flag. It's an improbable case. But, we have the same paranoia for
 242                  * the cleanup flag already.
 243                  * Might better be handled using complete()?
 244                  * (setting the flag and doing wakeup ought to be atomic
 245                  *  with regard to checking the flag as long as waitqueue is
 246                  *  part of the to be released structure)
 247                  */
 248                 wake_up(&fsf_req->completion_wq);
 249         }
 250
 251  out:
 252         return retval;
 253 }
 254
 255 /*
 256  * function:    zfcp_fsf_protstatus_eval
 257  *
 258  * purpose:     evaluates the QTCB of the finished FSF request
 259  *              and initiates appropriate actions
 260  *              (usually calling FSF command specific handlers)
 261  *
 262  * returns:
 263  *
 264  * context:
 265  *
 266  * locks:
 267  */
 268 static int
 269 zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *fsf_req)
 270 {
 271         int retval = 0;
 272         struct zfcp_adapter *adapter = fsf_req->adapter;
 273         struct fsf_qtcb *qtcb = fsf_req->qtcb;
 274         union fsf_prot_status_qual *prot_status_qual =
 275                 &qtcb->prefix.prot_status_qual;
 276
 277         zfcp_hba_dbf_event_fsf_response(fsf_req);
 278
 279         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 280                 ZFCP_LOG_DEBUG("fsf_req 0x%lx has been dismissed\n",
 281                                (unsigned long) fsf_req);
 282                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 283                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 284                 goto skip_protstatus;
 285         }
 286
 287         /* evaluate FSF Protocol Status */
 288         switch (qtcb->prefix.prot_status) {
 289
 290         case FSF_PROT_GOOD:
 291         case FSF_PROT_FSF_STATUS_PRESENTED:
 292                 break;
 293
 294         case FSF_PROT_QTCB_VERSION_ERROR:
 295                 ZFCP_LOG_NORMAL("error: The adapter %s contains "
 296                                 "microcode of version 0x%x, the device driver "
 297                                 "only supports 0x%x. Aborting.\n",
 298                                 zfcp_get_busid_by_adapter(adapter),
 299                                 prot_status_qual->version_error.fsf_version,
 300                                 ZFCP_QTCB_VERSION);
 301                 zfcp_erp_adapter_shutdown(adapter, 0, 117, fsf_req);
 302                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 303                 break;
 304
 305         case FSF_PROT_SEQ_NUMB_ERROR:
 306                 ZFCP_LOG_NORMAL("bug: Sequence number mismatch between "
 307                                 "driver (0x%x) and adapter %s (0x%x). "
 308                                 "Restarting all operations on this adapter.\n",
 309                                 qtcb->prefix.req_seq_no,
 310                                 zfcp_get_busid_by_adapter(adapter),
 311                                 prot_status_qual->sequence_error.exp_req_seq_no);
 312                 zfcp_erp_adapter_reopen(adapter, 0, 98, fsf_req);
 313                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 314                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 315                 break;
 316
 317         case FSF_PROT_UNSUPP_QTCB_TYPE:
 318                 ZFCP_LOG_NORMAL("error: Packet header type used by the "
 319                                 "device driver is incompatible with "
 320                                 "that used on adapter %s. "
 321                                 "Stopping all operations on this adapter.\n",
 322                                 zfcp_get_busid_by_adapter(adapter));
 323                 zfcp_erp_adapter_shutdown(adapter, 0, 118, fsf_req);
 324                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 325                 break;
 326
 327         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 328                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 329                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 330                                 &(adapter->status));
 331                 break;
 332
 333         case FSF_PROT_DUPLICATE_REQUEST_ID:
 334                         ZFCP_LOG_NORMAL("bug: The request identifier 0x%Lx "
 335                                         "to the adapter %s is ambiguous. "
 336                                 "Stopping all operations on this adapter.\n",
 337                                 *(unsigned long long*)
 338                                 (&qtcb->bottom.support.req_handle),
 339                                         zfcp_get_busid_by_adapter(adapter));
 340                 zfcp_erp_adapter_shutdown(adapter, 0, 78, fsf_req);
 341                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 342                 break;
 343
 344         case FSF_PROT_LINK_DOWN:
 345                 zfcp_fsf_link_down_info_eval(fsf_req, 37,
 346                                              &prot_status_qual->link_down_info);
 347                 /* FIXME: reopening adapter now? better wait for link up */
 348                 zfcp_erp_adapter_reopen(adapter, 0, 79, fsf_req);
 349                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 350                 break;
 351
 352         case FSF_PROT_REEST_QUEUE:
 353                 ZFCP_LOG_NORMAL("The local link to adapter with "
 354                               "%s was re-plugged. "
 355                               "Re-starting operations on this adapter.\n",
 356                               zfcp_get_busid_by_adapter(adapter));
 357                 /* All ports should be marked as ready to run again */
 358                 zfcp_erp_modify_adapter_status(adapter, 28, NULL,
 359                                                ZFCP_STATUS_COMMON_RUNNING,
 360                                                ZFCP_SET);
 361                 zfcp_erp_adapter_reopen(adapter,
 362                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 363                                         | ZFCP_STATUS_COMMON_ERP_FAILED,
 364                                         99, fsf_req);
 365                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 366                 break;
 367
 368         case FSF_PROT_ERROR_STATE:
 369                 ZFCP_LOG_NORMAL("error: The adapter %s "
 370                                 "has entered the error state. "
 371                                 "Restarting all operations on this "
 372                                 "adapter.\n",
 373                                 zfcp_get_busid_by_adapter(adapter));
 374                 zfcp_erp_adapter_reopen(adapter, 0, 100, fsf_req);
 375                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 376                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 377                 break;
 378
 379         default:
 380                 ZFCP_LOG_NORMAL("bug: Transfer protocol status information "
 381                                 "provided by the adapter %s "
 382                                 "is not compatible with the device driver. "
 383                                 "Stopping all operations on this adapter. "
 384                                 "(debug info 0x%x).\n",
 385                                 zfcp_get_busid_by_adapter(adapter),
 386                                 qtcb->prefix.prot_status);
 387                 zfcp_erp_adapter_shutdown(adapter, 0, 119, fsf_req);
 388                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 389         }
 390
 391  skip_protstatus:
 392         /*
 393          * always call specific handlers to give them a chance to do
 394          * something meaningful even in error cases
 395          */
 396         zfcp_fsf_fsfstatus_eval(fsf_req);
 397         return retval;
 398 }
 399
 400 /*
 401  * function:    zfcp_fsf_fsfstatus_eval
 402  *
 403  * purpose:     evaluates FSF status of completed FSF request
 404  *              and acts accordingly
 405  *
 406  * returns:
 407  */
 408 static int
 409 zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
 410 {
 411         int retval = 0;
 412
 413         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 414                 goto skip_fsfstatus;
 415         }
 416
 417         /* evaluate FSF Status */
 418         switch (fsf_req->qtcb->header.fsf_status) {
 419         case FSF_UNKNOWN_COMMAND:
 420                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 421                                 "not known by the adapter %s "
 422                                 "Stopping all operations on this adapter. "
 423                                 "(debug info 0x%x).\n",
 424                                 zfcp_get_busid_by_adapter(fsf_req->adapter),
 425                                 fsf_req->qtcb->header.fsf_command);
 426                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 120, fsf_req);
 427                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 428                 break;
 429
 430         case FSF_FCP_RSP_AVAILABLE:
 431                 ZFCP_LOG_DEBUG("FCP Sense data will be presented to the "
 432                                "SCSI stack.\n");
 433                 break;
 434
 435         case FSF_ADAPTER_STATUS_AVAILABLE:
 436                 zfcp_fsf_fsfstatus_qual_eval(fsf_req);
 437                 break;
 438         }
 439
 440  skip_fsfstatus:
 441         /*
 442          * always call specific handlers to give them a chance to do
 443          * something meaningful even in error cases
 444          */
 445         zfcp_fsf_req_dispatch(fsf_req);
 446
 447         return retval;
 448 }
 449
 450 /*
 451  * function:    zfcp_fsf_fsfstatus_qual_eval
 452  *
 453  * purpose:     evaluates FSF status-qualifier of completed FSF request
 454  *              and acts accordingly
 455  *
 456  * returns:
 457  */
 458 static int
 459 zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
 460 {
 461         int retval = 0;
 462
 463         switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 464         case FSF_SQ_FCP_RSP_AVAILABLE:
 465                 break;
 466         case FSF_SQ_RETRY_IF_POSSIBLE:
 467                 /* The SCSI-stack may now issue retries or escalate */
 468                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 469                 break;
 470         case FSF_SQ_COMMAND_ABORTED:
 471                 /* Carry the aborted state on to upper layer */
 472                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 473                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 474                 break;
 475         case FSF_SQ_NO_RECOM:
 476                 ZFCP_LOG_NORMAL("bug: No recommendation could be given for a "
 477                                 "problem on the adapter %s "
 478                                 "Stopping all operations on this adapter. ",
 479                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 480                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 121, fsf_req);
 481                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 482                 break;
 483         case FSF_SQ_ULP_PROGRAMMING_ERROR:
 484                 ZFCP_LOG_NORMAL("error: not enough SBALs for data transfer "
 485                                 "(adapter %s)\n",
 486                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 487                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 488                 break;
 489         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 490         case FSF_SQ_NO_RETRY_POSSIBLE:
 491         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 492                 /* dealt with in the respective functions */
 493                 break;
 494         default:
 495                 ZFCP_LOG_NORMAL("bug: Additional status info could "
 496                                 "not be interpreted properly.\n");
 497                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 498                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
 499                               sizeof (union fsf_status_qual));
 500                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 501                 break;
 502         }
 503
 504         return retval;
 505 }
 506
 507 /**
 508  * zfcp_fsf_link_down_info_eval - evaluate link down information block
 509  */
 510 static void
 511 zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *fsf_req, u8 id,
 512                              struct fsf_link_down_info *link_down)
 513 {
 514         struct zfcp_adapter *adapter = fsf_req->adapter;
 515
 516         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 517                              &adapter->status))
 518                 return;
 519
 520         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 521
 522         if (link_down == NULL)
 523                 goto out;
 524
 525         switch (link_down->error_code) {
 526         case FSF_PSQ_LINK_NO_LIGHT:
 527                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 528                                 "(no light detected)\n",
 529                                 zfcp_get_busid_by_adapter(adapter));
 530                 break;
 531         case FSF_PSQ_LINK_WRAP_PLUG:
 532                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 533                                 "(wrap plug detected)\n",
 534                                 zfcp_get_busid_by_adapter(adapter));
 535                 break;
 536         case FSF_PSQ_LINK_NO_FCP:
 537                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 538                                 "(adjacent node on link does not support FCP)\n",
 539                                 zfcp_get_busid_by_adapter(adapter));
 540                 break;
 541         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 542                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 543                                 "(firmware update in progress)\n",
 544                                 zfcp_get_busid_by_adapter(adapter));
 545                         break;
 546         case FSF_PSQ_LINK_INVALID_WWPN:
 547                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 548                                 "(duplicate or invalid WWPN detected)\n",
 549                                 zfcp_get_busid_by_adapter(adapter));
 550                 break;
 551         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 552                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 553                                 "(no support for NPIV by Fabric)\n",
 554                                 zfcp_get_busid_by_adapter(adapter));
 555                 break;
 556         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 557                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 558                                 "(out of resource in FCP daughtercard)\n",
 559                                 zfcp_get_busid_by_adapter(adapter));
 560                 break;
 561         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 562                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 563                                 "(out of resource in Fabric)\n",
 564                                 zfcp_get_busid_by_adapter(adapter));
 565                 break;
 566         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 567                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 568                                 "(unable to Fabric login)\n",
 569                                 zfcp_get_busid_by_adapter(adapter));
 570                 break;
 571         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 572                 ZFCP_LOG_NORMAL("WWPN assignment file corrupted on adapter %s\n",
 573                                 zfcp_get_busid_by_adapter(adapter));
 574                 break;
 575         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 576                 ZFCP_LOG_NORMAL("Mode table corrupted on adapter %s\n",
 577                                 zfcp_get_busid_by_adapter(adapter));
 578                 break;
 579         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 580                 ZFCP_LOG_NORMAL("No WWPN for assignment table on adapter %s\n",
 581                                 zfcp_get_busid_by_adapter(adapter));
 582                 break;
 583         default:
 584                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 585                                 "(warning: unknown reason code %d)\n",
 586                                 zfcp_get_busid_by_adapter(adapter),
 587                                 link_down->error_code);
 588         }
 589
 590         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 591                 ZFCP_LOG_DEBUG("Debug information to link down: "
 592                                "primary_status=0x%02x "
 593                                "ioerr_code=0x%02x "
 594                                "action_code=0x%02x "
 595                                "reason_code=0x%02x "
 596                                "explanation_code=0x%02x "
 597                                "vendor_specific_code=0x%02x\n",
 598                                 link_down->primary_status,
 599                                 link_down->ioerr_code,
 600                                 link_down->action_code,
 601                                 link_down->reason_code,
 602                                 link_down->explanation_code,
 603                                 link_down->vendor_specific_code);
 604
 605  out:
 606         zfcp_erp_adapter_failed(adapter, id, fsf_req);
 607 }
 608
 609 /*
 610  * function:    zfcp_fsf_req_dispatch
 611  *
 612  * purpose:     calls the appropriate command specific handler
 613  *
 614  * returns:
 615  */
 616 static int
 617 zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
 618 {
 619         struct zfcp_erp_action *erp_action = fsf_req->erp_action;
 620         struct zfcp_adapter *adapter = fsf_req->adapter;
 621         int retval = 0;
 622
 623
 624         switch (fsf_req->fsf_command) {
 625
 626         case FSF_QTCB_FCP_CMND:
 627                 zfcp_fsf_send_fcp_command_handler(fsf_req);
 628                 break;
 629
 630         case FSF_QTCB_ABORT_FCP_CMND:
 631                 zfcp_fsf_abort_fcp_command_handler(fsf_req);
 632                 break;
 633
 634         case FSF_QTCB_SEND_GENERIC:
 635                 zfcp_fsf_send_ct_handler(fsf_req);
 636                 break;
 637
 638         case FSF_QTCB_OPEN_PORT_WITH_DID:
 639                 zfcp_fsf_open_port_handler(fsf_req);
 640                 break;
 641
 642         case FSF_QTCB_OPEN_LUN:
 643                 zfcp_fsf_open_unit_handler(fsf_req);
 644                 break;
 645
 646         case FSF_QTCB_CLOSE_LUN:
 647                 zfcp_fsf_close_unit_handler(fsf_req);
 648                 break;
 649
 650         case FSF_QTCB_CLOSE_PORT:
 651                 zfcp_fsf_close_port_handler(fsf_req);
 652                 break;
 653
 654         case FSF_QTCB_CLOSE_PHYSICAL_PORT:
 655                 zfcp_fsf_close_physical_port_handler(fsf_req);
 656                 break;
 657
 658         case FSF_QTCB_EXCHANGE_CONFIG_DATA:
 659                 zfcp_fsf_exchange_config_data_handler(fsf_req);
 660                 break;
 661
 662         case FSF_QTCB_EXCHANGE_PORT_DATA:
 663                 zfcp_fsf_exchange_port_data_handler(fsf_req);
 664                 break;
 665
 666         case FSF_QTCB_SEND_ELS:
 667                 zfcp_fsf_send_els_handler(fsf_req);
 668                 break;
 669
 670         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 671                 zfcp_fsf_control_file_handler(fsf_req);
 672                 break;
 673
 674         case FSF_QTCB_UPLOAD_CONTROL_FILE:
 675                 zfcp_fsf_control_file_handler(fsf_req);
 676                 break;
 677
 678         default:
 679                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 680                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 681                                 "not supported by the adapter %s\n",
 682                                 zfcp_get_busid_by_adapter(adapter));
 683                 if (fsf_req->fsf_command != fsf_req->qtcb->header.fsf_command)
 684                         ZFCP_LOG_NORMAL
 685                             ("bug: Command issued by the device driver differs "
 686                              "from the command returned by the adapter %s "
 687                              "(debug info 0x%x, 0x%x).\n",
 688                              zfcp_get_busid_by_adapter(adapter),
 689                              fsf_req->fsf_command,
 690                              fsf_req->qtcb->header.fsf_command);
 691         }
 692
 693         if (!erp_action)
 694                 return retval;
 695
 696         zfcp_erp_async_handler(erp_action, 0);
 697
 698         return retval;
 699 }
 700
 701 /*
 702  * function:    zfcp_fsf_status_read
 703  *
 704  * purpose:     initiates a Status Read command at the specified adapter
 705  *
 706  * returns:
 707  */
 708 int
 709 zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
 710 {
 711         struct zfcp_fsf_req *fsf_req;
 712         struct fsf_status_read_buffer *status_buffer;
 713         unsigned long lock_flags;
 714         volatile struct qdio_buffer_element *sbale;
 715         int retval = 0;
 716
 717         /* setup new FSF request */
 718         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 719                                      req_flags | ZFCP_REQ_NO_QTCB,
 720                                      adapter->pool.fsf_req_status_read,
 721                                      &lock_flags, &fsf_req);
 722         if (retval < 0) {
 723                 ZFCP_LOG_INFO("error: Could not create unsolicited status "
 724                               "buffer for adapter %s.\n",
 725                               zfcp_get_busid_by_adapter(adapter));
 726                 goto failed_req_create;
 727         }
 728
 729         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 730         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 731         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 732         fsf_req->sbale_curr = 2;
 733
 734         status_buffer =
 735                 mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 736         if (!status_buffer) {
 737                 ZFCP_LOG_NORMAL("bug: could not get some buffer\n");
 738                 goto failed_buf;
 739         }
 740         memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
 741         fsf_req->data = (unsigned long) status_buffer;
 742
 743         /* insert pointer to respective buffer */
 744         sbale = zfcp_qdio_sbale_curr(fsf_req);
 745         sbale->addr = (void *) status_buffer;
 746         sbale->length = sizeof(struct fsf_status_read_buffer);
 747
 748         retval = zfcp_fsf_req_send(fsf_req);
 749         if (retval) {
 750                 ZFCP_LOG_DEBUG("error: Could not set-up unsolicited status "
 751                                "environment.\n");
 752                 goto failed_req_send;
 753         }
 754
 755         ZFCP_LOG_TRACE("Status Read request initiated (adapter%s)\n",
 756                        zfcp_get_busid_by_adapter(adapter));
 757         goto out;
 758
 759  failed_req_send:
 760         mempool_free(status_buffer, adapter->pool.data_status_read);
 761
 762  failed_buf:
 763         zfcp_fsf_req_free(fsf_req);
 764  failed_req_create:
 765         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 766  out:
 767         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 768         return retval;
 769 }
 770
 771 static int
 772 zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
 773 {
 774         struct fsf_status_read_buffer *status_buffer;
 775         struct zfcp_adapter *adapter;
 776         struct zfcp_port *port;
 777         unsigned long flags;
 778
 779         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
 780         adapter = fsf_req->adapter;
 781
 782         read_lock_irqsave(&zfcp_data.config_lock, flags);
 783         list_for_each_entry(port, &adapter->port_list_head, list)
 784             if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
 785                 break;
 786         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 787
 788         if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
 789                 ZFCP_LOG_NORMAL("bug: Reopen port indication received for "
 790                                 "nonexisting port with d_id 0x%06x on "
 791                                 "adapter %s. Ignored.\n",
 792                                 status_buffer->d_id & ZFCP_DID_MASK,
 793                                 zfcp_get_busid_by_adapter(adapter));
 794                 goto out;
 795         }
 796
 797         switch (status_buffer->status_subtype) {
 798
 799         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 800                 zfcp_erp_port_reopen(port, 0, 101, fsf_req);
 801                 break;
 802
 803         case FSF_STATUS_READ_SUB_ERROR_PORT:
 804                 zfcp_erp_port_shutdown(port, 0, 122, fsf_req);
 805                 break;
 806
 807         default:
 808                 ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
 809                                 "for a reopen indication on port with "
 810                                 "d_id 0x%06x on the adapter %s. "
 811                                 "Ignored. (debug info 0x%x)\n",
 812                                 status_buffer->d_id,
 813                                 zfcp_get_busid_by_adapter(adapter),
 814                                 status_buffer->status_subtype);
 815         }
 816  out:
 817         return 0;
 818 }
 819
 820 /*
 821  * function:    zfcp_fsf_status_read_handler
 822  *
 823  * purpose:     is called for finished Open Port command
 824  *
 825  * returns:
 826  */
 827 static int
 828 zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
 829 {
 830         int retval = 0;
 831         struct zfcp_adapter *adapter = fsf_req->adapter;
 832         struct fsf_status_read_buffer *status_buffer =
 833                 (struct fsf_status_read_buffer *) fsf_req->data;
 834         struct fsf_bit_error_payload *fsf_bit_error;
 835
 836         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 837                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, status_buffer);
 838                 mempool_free(status_buffer, adapter->pool.data_status_read);
 839                 zfcp_fsf_req_free(fsf_req);
 840                 goto out;
 841         }
 842
 843         zfcp_hba_dbf_event_fsf_unsol("read", adapter, status_buffer);
 844
 845         switch (status_buffer->status_type) {
 846
 847         case FSF_STATUS_READ_PORT_CLOSED:
 848                 zfcp_fsf_status_read_port_closed(fsf_req);
 849                 break;
 850
 851         case FSF_STATUS_READ_INCOMING_ELS:
 852                 zfcp_fsf_incoming_els(fsf_req);
 853                 break;
 854
 855         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 856                 ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
 857                               zfcp_get_busid_by_adapter(adapter));
 858                 break;
 859
 860         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 861                 fsf_bit_error = (struct fsf_bit_error_payload *)
 862                         status_buffer->payload;
 863                 ZFCP_LOG_NORMAL("Warning: bit error threshold data "
 864                     "received (adapter %s, "
 865                     "link failures = %i, loss of sync errors = %i, "
 866                     "loss of signal errors = %i, "
 867                     "primitive sequence errors = %i, "
 868                     "invalid transmission word errors = %i, "
 869                     "CRC errors = %i)\n",
 870                     zfcp_get_busid_by_adapter(adapter),
 871                     fsf_bit_error->link_failure_error_count,
 872                     fsf_bit_error->loss_of_sync_error_count,
 873                     fsf_bit_error->loss_of_signal_error_count,
 874                     fsf_bit_error->primitive_sequence_error_count,
 875                     fsf_bit_error->invalid_transmission_word_error_count,
 876                     fsf_bit_error->crc_error_count);
 877                 ZFCP_LOG_INFO("Additional bit error threshold data "
 878                     "(adapter %s, "
 879                     "primitive sequence event time-outs = %i, "
 880                     "elastic buffer overrun errors = %i, "
 881                     "advertised receive buffer-to-buffer credit = %i, "
 882                     "current receice buffer-to-buffer credit = %i, "
 883                     "advertised transmit buffer-to-buffer credit = %i, "
 884                     "current transmit buffer-to-buffer credit = %i)\n",
 885                     zfcp_get_busid_by_adapter(adapter),
 886                     fsf_bit_error->primitive_sequence_event_timeout_count,
 887                     fsf_bit_error->elastic_buffer_overrun_error_count,
 888                     fsf_bit_error->advertised_receive_b2b_credit,
 889                     fsf_bit_error->current_receive_b2b_credit,
 890                     fsf_bit_error->advertised_transmit_b2b_credit,
 891                     fsf_bit_error->current_transmit_b2b_credit);
 892                 break;
 893
 894         case FSF_STATUS_READ_LINK_DOWN:
 895                 switch (status_buffer->status_subtype) {
 896                 case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 897                         ZFCP_LOG_INFO("Physical link to adapter %s is down\n",
 898                                       zfcp_get_busid_by_adapter(adapter));
 899                         zfcp_fsf_link_down_info_eval(fsf_req, 38,
 900                                 (struct fsf_link_down_info *)
 901                                 &status_buffer->payload);
 902                         break;
 903                 case FSF_STATUS_READ_SUB_FDISC_FAILED:
 904                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 905                                       "due to failed FDISC login\n",
 906                                       zfcp_get_busid_by_adapter(adapter));
 907                         zfcp_fsf_link_down_info_eval(fsf_req, 39,
 908                                 (struct fsf_link_down_info *)
 909                                 &status_buffer->payload);
 910                         break;
 911                 case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 912                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 913                                       "due to firmware update on adapter\n",
 914                                       zfcp_get_busid_by_adapter(adapter));
 915                         zfcp_fsf_link_down_info_eval(fsf_req, 40, NULL);
 916                         break;
 917                 default:
 918                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 919                                       "due to unknown reason\n",
 920                                       zfcp_get_busid_by_adapter(adapter));
 921                         zfcp_fsf_link_down_info_eval(fsf_req, 41, NULL);
 922                 };
 923                 break;
 924
 925         case FSF_STATUS_READ_LINK_UP:
 926                 ZFCP_LOG_NORMAL("Local link to adapter %s was replugged. "
 927                                 "Restarting operations on this adapter\n",
 928                                 zfcp_get_busid_by_adapter(adapter));
 929                 /* All ports should be marked as ready to run again */
 930                 zfcp_erp_modify_adapter_status(adapter, 30, NULL,
 931                                                ZFCP_STATUS_COMMON_RUNNING,
 932                                                ZFCP_SET);
 933                 zfcp_erp_adapter_reopen(adapter,
 934                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 935                                         | ZFCP_STATUS_COMMON_ERP_FAILED,
 936                                         102, fsf_req);
 937                 break;
 938
 939         case FSF_STATUS_READ_NOTIFICATION_LOST:
 940                 ZFCP_LOG_NORMAL("Unsolicited status notification(s) lost: "
 941                                 "adapter %s%s%s%s%s%s%s%s%s\n",
 942                                 zfcp_get_busid_by_adapter(adapter),
 943                                 (status_buffer->status_subtype &
 944                                         FSF_STATUS_READ_SUB_INCOMING_ELS) ?
 945                                         ", incoming ELS" : "",
 946                                 (status_buffer->status_subtype &
 947                                         FSF_STATUS_READ_SUB_SENSE_DATA) ?
 948                                         ", sense data" : "",
 949                                 (status_buffer->status_subtype &
 950                                         FSF_STATUS_READ_SUB_LINK_STATUS) ?
 951                                         ", link status change" : "",
 952                                 (status_buffer->status_subtype &
 953                                         FSF_STATUS_READ_SUB_PORT_CLOSED) ?
 954                                         ", port close" : "",
 955                                 (status_buffer->status_subtype &
 956                                         FSF_STATUS_READ_SUB_BIT_ERROR_THRESHOLD) ?
 957                                         ", bit error exception" : "",
 958                                 (status_buffer->status_subtype &
 959                                         FSF_STATUS_READ_SUB_ACT_UPDATED) ?
 960                                         ", ACT update" : "",
 961                                 (status_buffer->status_subtype &
 962                                         FSF_STATUS_READ_SUB_ACT_HARDENED) ?
 963                                         ", ACT hardening" : "",
 964                                 (status_buffer->status_subtype &
 965                                         FSF_STATUS_READ_SUB_FEATURE_UPDATE_ALERT) ?
 966                                         ", adapter feature change" : "");
 967
 968                 if (status_buffer->status_subtype &
 969                     FSF_STATUS_READ_SUB_ACT_UPDATED)
 970                         zfcp_erp_adapter_access_changed(adapter, 135, fsf_req);
 971                 break;
 972
 973         case FSF_STATUS_READ_CFDC_UPDATED:
 974                 ZFCP_LOG_NORMAL("CFDC has been updated on the adapter %s\n",
 975                               zfcp_get_busid_by_adapter(adapter));
 976                 zfcp_erp_adapter_access_changed(adapter, 136, fsf_req);
 977                 break;
 978
 979         case FSF_STATUS_READ_CFDC_HARDENED:
 980                 switch (status_buffer->status_subtype) {
 981                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
 982                         ZFCP_LOG_NORMAL("CFDC of adapter %s saved on SE\n",
 983                                       zfcp_get_busid_by_adapter(adapter));
 984                         break;
 985                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
 986                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been copied "
 987                                       "to the secondary SE\n",
 988                                 zfcp_get_busid_by_adapter(adapter));
 989                         break;
 990                 default:
 991                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been hardened\n",
 992                                       zfcp_get_busid_by_adapter(adapter));
 993                 }
 994                 break;
 995
 996         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 997                 ZFCP_LOG_INFO("List of supported features on adapter %s has "
 998                               "been changed from 0x%08X to 0x%08X\n",
 999                               zfcp_get_busid_by_adapter(adapter),
1000                               *(u32*) (status_buffer->payload + 4),
1001                               *(u32*) (status_buffer->payload));
1002                 adapter->adapter_features = *(u32*) status_buffer->payload;
1003                 break;
1004
1005         default:
1006                 ZFCP_LOG_NORMAL("warning: An unsolicited status packet of unknown "
1007                                 "type was received (debug info 0x%x)\n",
1008                                 status_buffer->status_type);
1009                 ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
1010                                status_buffer);
1011                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1012                               (char *) status_buffer,
1013                               sizeof (struct fsf_status_read_buffer));
1014                 break;
1015         }
1016         mempool_free(status_buffer, adapter->pool.data_status_read);
1017         zfcp_fsf_req_free(fsf_req);
1018         /*
1019          * recycle buffer and start new request repeat until outbound
1020          * queue is empty or adapter shutdown is requested
1021          */
1022         /*
1023          * FIXME(qdio):
1024          * we may wait in the req_create for 5s during shutdown, so
1025          * qdio_cleanup will have to wait at least that long before returning
1026          * with failure to allow us a proper cleanup under all circumstances
1027          */
1028         /*
1029          * FIXME:
1030          * allocation failure possible? (Is this code needed?)
1031          */
1032         retval = zfcp_fsf_status_read(adapter, 0);
1033         if (retval < 0) {
1034                 ZFCP_LOG_INFO("Failed to create unsolicited status read "
1035                               "request for the adapter %s.\n",
1036                               zfcp_get_busid_by_adapter(adapter));
1037                 /* temporary fix to avoid status read buffer shortage */
1038                 adapter->status_read_failed++;
1039                 if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
1040                     < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
1041                         ZFCP_LOG_INFO("restart adapter %s due to status read "
1042                                       "buffer shortage\n",
1043                                       zfcp_get_busid_by_adapter(adapter));
1044                         zfcp_erp_adapter_reopen(adapter, 0, 103, fsf_req);
1045                 }
1046         }
1047  out:
1048         return retval;
1049 }
1050
1051 /*
1052  * function:    zfcp_fsf_abort_fcp_command
1053  *
1054  * purpose:     tells FSF to abort a running SCSI command
1055  *
1056  * returns:     address of initiated FSF request
1057  *              NULL - request could not be initiated
1058  *
1059  * FIXME(design): should be watched by a timeout !!!
1060  * FIXME(design) shouldn't this be modified to return an int
1061  *               also...don't know how though
1062  */
1063 struct zfcp_fsf_req *
1064 zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
1065                            struct zfcp_adapter *adapter,
1066                            struct zfcp_unit *unit, int req_flags)
1067 {
1068         volatile struct qdio_buffer_element *sbale;
1069         struct zfcp_fsf_req *fsf_req = NULL;
1070         unsigned long lock_flags;
1071         int retval = 0;
1072
1073         /* setup new FSF request */
1074         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
1075                                      req_flags, adapter->pool.fsf_req_abort,
1076                                      &lock_flags, &fsf_req);
1077         if (retval < 0) {
1078                 ZFCP_LOG_INFO("error: Failed to create an abort command "
1079                               "request for lun 0x%016Lx on port 0x%016Lx "
1080                               "on adapter %s.\n",
1081                               unit->fcp_lun,
1082                               unit->port->wwpn,
1083                               zfcp_get_busid_by_adapter(adapter));
1084                 goto out;
1085         }
1086
1087         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1088                         &unit->status)))
1089                 goto unit_blocked;
1090
1091         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1092         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1093         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1094
1095         fsf_req->data = (unsigned long) unit;
1096
1097         /* set handles of unit and its parent port in QTCB */
1098         fsf_req->qtcb->header.lun_handle = unit->handle;
1099         fsf_req->qtcb->header.port_handle = unit->port->handle;
1100
1101         /* set handle of request which should be aborted */
1102         fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1103
1104         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
1105         retval = zfcp_fsf_req_send(fsf_req);
1106         if (!retval)
1107                 goto out;
1108
1109  unit_blocked:
1110                 zfcp_fsf_req_free(fsf_req);
1111                 fsf_req = NULL;
1112
1113  out:
1114         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
1115         return fsf_req;
1116 }
1117
1118 /*
1119  * function:    zfcp_fsf_abort_fcp_command_handler
1120  *
1121  * purpose:     is called for finished Abort FCP Command request
1122  *
1123  * returns:
1124  */
1125 static int
1126 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
1127 {
1128         int retval = -EINVAL;
1129         struct zfcp_unit *unit;
1130         union fsf_status_qual *fsf_stat_qual =
1131                 &new_fsf_req->qtcb->header.fsf_status_qual;
1132
1133         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1134                 /* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
1135                 goto skip_fsfstatus;
1136         }
1137
1138         unit = (struct zfcp_unit *) new_fsf_req->data;
1139
1140         /* evaluate FSF status in QTCB */
1141         switch (new_fsf_req->qtcb->header.fsf_status) {
1142
1143         case FSF_PORT_HANDLE_NOT_VALID:
1144                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1145                         /*
1146                          * In this case a command that was sent prior to a port
1147                          * reopen was aborted (handles are different). This is
1148                          * fine.
1149                          */
1150                 } else {
1151                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1152                                       "port 0x%016Lx on adapter %s invalid. "
1153                                       "This may happen occasionally.\n",
1154                                       unit->port->handle,
1155                                       unit->port->wwpn,
1156                                       zfcp_get_busid_by_unit(unit));
1157                         ZFCP_LOG_INFO("status qualifier:\n");
1158                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1159                                       (char *) &new_fsf_req->qtcb->header.
1160                                       fsf_status_qual,
1161                                       sizeof (union fsf_status_qual));
1162                         /* Let's hope this sorts out the mess */
1163                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
1164                                                 new_fsf_req);
1165                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1166                 }
1167                 break;
1168
1169         case FSF_LUN_HANDLE_NOT_VALID:
1170                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1171                         /*
1172                          * In this case a command that was sent prior to a unit
1173                          * reopen was aborted (handles are different).
1174                          * This is fine.
1175                          */
1176                 } else {
1177                         ZFCP_LOG_INFO
1178                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1179                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1180                              "invalid. This may happen in rare cases. "
1181                              "Trying to re-establish link.\n",
1182                              unit->handle,
1183                              unit->fcp_lun,
1184                              unit->port->wwpn,
1185                              zfcp_get_busid_by_unit(unit));
1186                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1187                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1188                                       (char *) &new_fsf_req->qtcb->header.
1189                                       fsf_status_qual,
1190                                       sizeof (union fsf_status_qual));
1191                         /* Let's hope this sorts out the mess */
1192                         zfcp_erp_port_reopen(unit->port, 0, 105, new_fsf_req);
1193                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1194                 }
1195                 break;
1196
1197         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1198                 retval = 0;
1199                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1200                 break;
1201
1202         case FSF_PORT_BOXED:
1203                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1204                               "be reopened\n", unit->port->wwpn,
1205                               zfcp_get_busid_by_unit(unit));
1206                 zfcp_erp_port_boxed(unit->port, 47, new_fsf_req);
1207                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1208                     | ZFCP_STATUS_FSFREQ_RETRY;
1209                 break;
1210
1211         case FSF_LUN_BOXED:
1212                 ZFCP_LOG_INFO(
1213                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1214                         "to be reopened\n",
1215                         unit->fcp_lun, unit->port->wwpn,
1216                         zfcp_get_busid_by_unit(unit));
1217                 zfcp_erp_unit_boxed(unit, 48, new_fsf_req);
1218                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1219                         | ZFCP_STATUS_FSFREQ_RETRY;
1220                 break;
1221
1222         case FSF_ADAPTER_STATUS_AVAILABLE:
1223                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1224                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1225                         zfcp_test_link(unit->port);
1226                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1227                         break;
1228                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1229                         /* SCSI stack will escalate */
1230                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1231                         break;
1232                 default:
1233                         ZFCP_LOG_NORMAL
1234                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1235                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1236                         break;
1237                 }
1238                 break;
1239
1240         case FSF_GOOD:
1241                 retval = 0;
1242                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1243                 break;
1244
1245         default:
1246                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1247                                 "(debug info 0x%x)\n",
1248                                 new_fsf_req->qtcb->header.fsf_status);
1249                 break;
1250         }
1251  skip_fsfstatus:
1252         return retval;
1253 }
1254
1255 /**
1256  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1257  *      one SBALE
1258  * Two scatter-gather lists are passed, one for the reqeust and one for the
1259  * response.
1260  */
1261 static inline int
1262 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1263                   struct scatterlist *resp, int resp_count)
1264 {
1265         return ((req_count == 1) &&
1266                 (resp_count == 1) &&
1267                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1268                   PAGE_MASK) ==
1269                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1270                                    req[0].length - 1) & PAGE_MASK)) &&
1271                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1272                   PAGE_MASK) ==
1273                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1274                                    resp[0].length - 1) & PAGE_MASK)));
1275 }
1276
1277 /**
1278  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1279  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1280  *      the request
1281  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1282  *      a struct zfcp_fsf_req
1283  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1284  *      is sent within error recovery
1285  */
1286 int
1287 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1288                  struct zfcp_erp_action *erp_action)
1289 {
1290         volatile struct qdio_buffer_element *sbale;
1291         struct zfcp_port *port;
1292         struct zfcp_adapter *adapter;
1293         struct zfcp_fsf_req *fsf_req;
1294         unsigned long lock_flags;
1295         int bytes;
1296         int ret = 0;
1297
1298         port = ct->port;
1299         adapter = port->adapter;
1300
1301         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1302                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1303                                   pool, &lock_flags, &fsf_req);
1304         if (ret < 0) {
1305                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1306                               "adapter: %s\n",
1307                               zfcp_get_busid_by_adapter(adapter));
1308                 goto failed_req;
1309         }
1310
1311         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1312         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1313                               ct->resp, ct->resp_count)){
1314                 /* both request buffer and response buffer
1315                    fit into one sbale each */
1316                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1317                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1318                 sbale[2].length = ct->req[0].length;
1319                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1320                 sbale[3].length = ct->resp[0].length;
1321                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1322         } else if (adapter->adapter_features &
1323                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1324                 /* try to use chained SBALs */
1325                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1326                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1327                                                 ct->req, ct->req_count,
1328                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1329                 if (bytes <= 0) {
1330                         ZFCP_LOG_INFO("error: creation of CT request failed "
1331                                       "on adapter %s\n",
1332                                       zfcp_get_busid_by_adapter(adapter));
1333                         if (bytes == 0)
1334                                 ret = -ENOMEM;
1335                         else
1336                                 ret = bytes;
1337
1338                         goto failed_send;
1339                 }
1340                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1341                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1342                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1343                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1344                                                 ct->resp, ct->resp_count,
1345                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1346                 if (bytes <= 0) {
1347                         ZFCP_LOG_INFO("error: creation of CT request failed "
1348                                       "on adapter %s\n",
1349                                       zfcp_get_busid_by_adapter(adapter));
1350                         if (bytes == 0)
1351                                 ret = -ENOMEM;
1352                         else
1353                                 ret = bytes;
1354
1355                         goto failed_send;
1356                 }
1357                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1358         } else {
1359                 /* reject send generic request */
1360                 ZFCP_LOG_INFO(
1361                         "error: microcode does not support chained SBALs,"
1362                         "CT request too big (adapter %s)\n",
1363                         zfcp_get_busid_by_adapter(adapter));
1364                 ret = -EOPNOTSUPP;
1365                 goto failed_send;
1366         }
1367
1368         /* settings in QTCB */
1369         fsf_req->qtcb->header.port_handle = port->handle;
1370         fsf_req->qtcb->bottom.support.service_class =
1371                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1372         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1373         fsf_req->data = (unsigned long) ct;
1374
1375         zfcp_san_dbf_event_ct_request(fsf_req);
1376
1377         if (erp_action) {
1378                 erp_action->fsf_req = fsf_req;
1379                 fsf_req->erp_action = erp_action;
1380                 zfcp_erp_start_timer(fsf_req);
1381         } else
1382                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1383
1384         ret = zfcp_fsf_req_send(fsf_req);
1385         if (ret) {
1386                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1387                                "(adapter %s, port 0x%016Lx)\n",
1388                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1389                 goto failed_send;
1390         }
1391
1392         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1393                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1394         goto out;
1395
1396  failed_send:
1397         zfcp_fsf_req_free(fsf_req);
1398         if (erp_action != NULL) {
1399                 erp_action->fsf_req = NULL;
1400         }
1401  failed_req:
1402  out:
1403         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1404                                 lock_flags);
1405         return ret;
1406 }
1407
1408 /**
1409  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1410  * @fsf_req: pointer to struct zfcp_fsf_req
1411  *
1412  * Data specific for the Generic Service request is passed using
1413  * fsf_req->data. There we find the pointer to struct zfcp_send_ct.
1414  * Usually a specific handler for the CT request is called which is
1415  * found in this structure.
1416  */
1417 static int
1418 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1419 {
1420         struct zfcp_port *port;
1421         struct zfcp_adapter *adapter;
1422         struct zfcp_send_ct *send_ct;
1423         struct fsf_qtcb_header *header;
1424         struct fsf_qtcb_bottom_support *bottom;
1425         int retval = -EINVAL;
1426         u16 subtable, rule, counter;
1427
1428         adapter = fsf_req->adapter;
1429         send_ct = (struct zfcp_send_ct *) fsf_req->data;
1430         port = send_ct->port;
1431         header = &fsf_req->qtcb->header;
1432         bottom = &fsf_req->qtcb->bottom.support;
1433
1434         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1435                 goto skip_fsfstatus;
1436
1437         /* evaluate FSF status in QTCB */
1438         switch (header->fsf_status) {
1439
1440         case FSF_GOOD:
1441                 zfcp_san_dbf_event_ct_response(fsf_req);
1442                 retval = 0;
1443                 break;
1444
1445         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1446                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1447                               "class %d.\n",
1448                               zfcp_get_busid_by_port(port),
1449                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1450                 /* stop operation for this adapter */
1451                 zfcp_erp_adapter_shutdown(adapter, 0, 123, fsf_req);
1452                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1453                 break;
1454
1455         case FSF_ADAPTER_STATUS_AVAILABLE:
1456                 switch (header->fsf_status_qual.word[0]){
1457                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1458                         /* reopening link to port */
1459                         zfcp_test_link(port);
1460                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1461                         break;
1462                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1463                         /* ERP strategy will escalate */
1464                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1465                         break;
1466                 default:
1467                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1468                                       "arrived.\n",
1469                                       header->fsf_status_qual.word[0]);
1470                         break;
1471                 }
1472                 break;
1473
1474         case FSF_ACCESS_DENIED:
1475                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1476                                 "command (adapter %s, port d_id=0x%06x)\n",
1477                                 zfcp_get_busid_by_port(port), port->d_id);
1478                 for (counter = 0; counter < 2; counter++) {
1479                         subtable = header->fsf_status_qual.halfword[counter * 2];
1480                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1481                         switch (subtable) {
1482                         case FSF_SQ_CFDC_SUBTABLE_OS:
1483                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1484                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1485                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1486                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1487                                         zfcp_act_subtable_type[subtable], rule);
1488                                 break;
1489                         }
1490                 }
1491                 zfcp_erp_port_access_denied(port, 55, fsf_req);
1492                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1493                 break;
1494
1495         case FSF_GENERIC_COMMAND_REJECTED:
1496                 ZFCP_LOG_INFO("generic service command rejected "
1497                               "(adapter %s, port d_id=0x%06x)\n",
1498                               zfcp_get_busid_by_port(port), port->d_id);
1499                 ZFCP_LOG_INFO("status qualifier:\n");
1500                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1501                               (char *) &header->fsf_status_qual,
1502                               sizeof (union fsf_status_qual));
1503                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1504                 break;
1505
1506         case FSF_PORT_HANDLE_NOT_VALID:
1507                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1508                                "0x%016Lx on adapter %s invalid. This may "
1509                                "happen occasionally.\n", port->handle,
1510                                port->wwpn, zfcp_get_busid_by_port(port));
1511                 ZFCP_LOG_INFO("status qualifier:\n");
1512                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1513                               (char *) &header->fsf_status_qual,
1514                               sizeof (union fsf_status_qual));
1515                 zfcp_erp_adapter_reopen(adapter, 0, 106, fsf_req);
1516                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1517                 break;
1518
1519         case FSF_PORT_BOXED:
1520                 ZFCP_LOG_INFO("port needs to be reopened "
1521                               "(adapter %s, port d_id=0x%06x)\n",
1522                               zfcp_get_busid_by_port(port), port->d_id);
1523                 zfcp_erp_port_boxed(port, 49, fsf_req);
1524                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1525                     | ZFCP_STATUS_FSFREQ_RETRY;
1526                 break;
1527
1528         /* following states should never occure, all cases avoided
1529            in zfcp_fsf_send_ct - but who knows ... */
1530         case FSF_PAYLOAD_SIZE_MISMATCH:
1531                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1532                               "req_buf_length=%d, resp_buf_length=%d)\n",
1533                               zfcp_get_busid_by_adapter(adapter),
1534                               bottom->req_buf_length, bottom->resp_buf_length);
1535                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1536                 break;
1537         case FSF_REQUEST_SIZE_TOO_LARGE:
1538                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1539                               "req_buf_length=%d)\n",
1540                               zfcp_get_busid_by_adapter(adapter),
1541                               bottom->req_buf_length);
1542                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1543                 break;
1544         case FSF_RESPONSE_SIZE_TOO_LARGE:
1545                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1546                               "resp_buf_length=%d)\n",
1547                               zfcp_get_busid_by_adapter(adapter),
1548                               bottom->resp_buf_length);
1549                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1550                 break;
1551         case FSF_SBAL_MISMATCH:
1552                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1553                               "resp_buf_length=%d)\n",
1554                               zfcp_get_busid_by_adapter(adapter),
1555                               bottom->req_buf_length, bottom->resp_buf_length);
1556                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1557                 break;
1558
1559        default:
1560                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1561                                 "(debug info 0x%x)\n", header->fsf_status);
1562                 break;
1563         }
1564
1565 skip_fsfstatus:
1566         send_ct->status = retval;
1567
1568         if (send_ct->handler != NULL)
1569                 send_ct->handler(send_ct->handler_data);
1570
1571         return retval;
1572 }
1573
1574 /**
1575  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1576  * @els: pointer to struct zfcp_send_els which contains all needed data for
1577  *      the command.
1578  */
1579 int
1580 zfcp_fsf_send_els(struct zfcp_send_els *els)
1581 {
1582         volatile struct qdio_buffer_element *sbale;
1583         struct zfcp_fsf_req *fsf_req;
1584         u32 d_id;
1585         struct zfcp_adapter *adapter;
1586         unsigned long lock_flags;
1587         int bytes;
1588         int ret = 0;
1589
1590         d_id = els->d_id;
1591         adapter = els->adapter;
1592
1593         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1594                                   ZFCP_REQ_AUTO_CLEANUP,
1595                                   NULL, &lock_flags, &fsf_req);
1596         if (ret < 0) {
1597                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1598                               "(adapter %s, port d_id: 0x%06x)\n",
1599                               zfcp_get_busid_by_adapter(adapter), d_id);
1600                 goto failed_req;
1601         }
1602
1603         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1604                         &els->port->status))) {
1605                 ret = -EBUSY;
1606                 goto port_blocked;
1607         }
1608
1609         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1610         if (zfcp_use_one_sbal(els->req, els->req_count,
1611                               els->resp, els->resp_count)){
1612                 /* both request buffer and response buffer
1613                    fit into one sbale each */
1614                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1615                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1616                 sbale[2].length = els->req[0].length;
1617                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1618                 sbale[3].length = els->resp[0].length;
1619                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1620         } else if (adapter->adapter_features &
1621                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1622                 /* try to use chained SBALs */
1623                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1624                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1625                                                 els->req, els->req_count,
1626                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1627                 if (bytes <= 0) {
1628                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1629                                       "(adapter %s, port d_id: 0x%06x)\n",
1630                                       zfcp_get_busid_by_adapter(adapter), d_id);
1631                         if (bytes == 0) {
1632                                 ret = -ENOMEM;
1633                         } else {
1634                                 ret = bytes;
1635                         }
1636                         goto failed_send;
1637                 }
1638                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1639                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1640                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1641                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1642                                                 els->resp, els->resp_count,
1643                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1644                 if (bytes <= 0) {
1645                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1646                                       "(adapter %s, port d_id: 0x%06x)\n",
1647                                       zfcp_get_busid_by_adapter(adapter), d_id);
1648                         if (bytes == 0) {
1649                                 ret = -ENOMEM;
1650                         } else {
1651                                 ret = bytes;
1652                         }
1653                         goto failed_send;
1654                 }
1655                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1656         } else {
1657                 /* reject request */
1658                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1659                               ", ELS request too big (adapter %s, "
1660                               "port d_id: 0x%06x)\n",
1661                               zfcp_get_busid_by_adapter(adapter), d_id);
1662                 ret = -EOPNOTSUPP;
1663                 goto failed_send;
1664         }
1665
1666         /* settings in QTCB */
1667         fsf_req->qtcb->bottom.support.d_id = d_id;
1668         fsf_req->qtcb->bottom.support.service_class =
1669                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1670         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1671         fsf_req->data = (unsigned long) els;
1672
1673         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1674
1675         zfcp_san_dbf_event_els_request(fsf_req);
1676
1677         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1678         ret = zfcp_fsf_req_send(fsf_req);
1679         if (ret) {
1680                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1681                                "(adapter %s, port d_id: 0x%06x)\n",
1682                                zfcp_get_busid_by_adapter(adapter), d_id);
1683                 goto failed_send;
1684         }
1685
1686         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1687                        "0x%06x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1688         goto out;
1689
1690  port_blocked:
1691  failed_send:
1692         zfcp_fsf_req_free(fsf_req);
1693
1694  failed_req:
1695  out:
1696         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1697                                 lock_flags);
1698
1699         return ret;
1700 }
1701
1702 /**
1703  * zfcp_fsf_send_els_handler - handler for ELS commands
1704  * @fsf_req: pointer to struct zfcp_fsf_req
1705  *
1706  * Data specific for the ELS command is passed using
1707  * fsf_req->data. There we find the pointer to struct zfcp_send_els.
1708  * Usually a specific handler for the ELS command is called which is
1709  * found in this structure.
1710  */
1711 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1712 {
1713         struct zfcp_adapter *adapter;
1714         struct zfcp_port *port;
1715         u32 d_id;
1716         struct fsf_qtcb_header *header;
1717         struct fsf_qtcb_bottom_support *bottom;
1718         struct zfcp_send_els *send_els;
1719         int retval = -EINVAL;
1720         u16 subtable, rule, counter;
1721
1722         send_els = (struct zfcp_send_els *) fsf_req->data;
1723         adapter = send_els->adapter;
1724         port = send_els->port;
1725         d_id = send_els->d_id;
1726         header = &fsf_req->qtcb->header;
1727         bottom = &fsf_req->qtcb->bottom.support;
1728
1729         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1730                 goto skip_fsfstatus;
1731
1732         switch (header->fsf_status) {
1733
1734         case FSF_GOOD:
1735                 zfcp_san_dbf_event_els_response(fsf_req);
1736                 retval = 0;
1737                 break;
1738
1739         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1740                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1741                               "class %d.\n",
1742                               zfcp_get_busid_by_adapter(adapter),
1743                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1744                 /* stop operation for this adapter */
1745                 zfcp_erp_adapter_shutdown(adapter, 0, 124, fsf_req);
1746                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1747                 break;
1748
1749         case FSF_ADAPTER_STATUS_AVAILABLE:
1750                 switch (header->fsf_status_qual.word[0]){
1751                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1752                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1753                                 zfcp_test_link(port);
1754                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1755                         break;
1756                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1757                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1758                         retval =
1759                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1760                                               (struct zfcp_ls_rjt_par *)
1761                                               &header->fsf_status_qual.word[2]);
1762                         break;
1763                 case FSF_SQ_RETRY_IF_POSSIBLE:
1764                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1765                         break;
1766                 default:
1767                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1768                                       header->fsf_status_qual.word[0]);
1769                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1770                                 (char*)header->fsf_status_qual.word, 16);
1771                 }
1772                 break;
1773
1774         case FSF_ELS_COMMAND_REJECTED:
1775                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1776                               "prohibited sending "
1777                               "(adapter: %s, port d_id: 0x%06x)\n",
1778                               zfcp_get_busid_by_adapter(adapter), d_id);
1779
1780                 break;
1781
1782         case FSF_PAYLOAD_SIZE_MISMATCH:
1783                 ZFCP_LOG_INFO(
1784                         "ELS request size and ELS response size must be either "
1785                         "both 0, or both greater than 0 "
1786                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1787                         zfcp_get_busid_by_adapter(adapter),
1788                         bottom->req_buf_length,
1789                         bottom->resp_buf_length);
1790                 break;
1791
1792         case FSF_REQUEST_SIZE_TOO_LARGE:
1793                 ZFCP_LOG_INFO(
1794                         "Length of the ELS request buffer, "
1795                         "specified in QTCB bottom, "
1796                         "exceeds the size of the buffers "
1797                         "that have been allocated for ELS request data "
1798                         "(adapter: %s, req_buf_length=%d)\n",
1799                         zfcp_get_busid_by_adapter(adapter),
1800                         bottom->req_buf_length);
1801                 break;
1802
1803         case FSF_RESPONSE_SIZE_TOO_LARGE:
1804                 ZFCP_LOG_INFO(
1805                         "Length of the ELS response buffer, "
1806                         "specified in QTCB bottom, "
1807                         "exceeds the size of the buffers "
1808                         "that have been allocated for ELS response data "
1809                         "(adapter: %s, resp_buf_length=%d)\n",
1810                         zfcp_get_busid_by_adapter(adapter),
1811                         bottom->resp_buf_length);
1812                 break;
1813
1814         case FSF_SBAL_MISMATCH:
1815                 /* should never occure, avoided in zfcp_fsf_send_els */
1816                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1817                               "resp_buf_length=%d)\n",
1818                               zfcp_get_busid_by_adapter(adapter),
1819                               bottom->req_buf_length, bottom->resp_buf_length);
1820                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1821                 break;
1822
1823         case FSF_ACCESS_DENIED:
1824                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1825                                 "(adapter %s, port d_id=0x%06x)\n",
1826                                 zfcp_get_busid_by_adapter(adapter), d_id);
1827                 for (counter = 0; counter < 2; counter++) {
1828                         subtable = header->fsf_status_qual.halfword[counter * 2];
1829                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1830                         switch (subtable) {
1831                         case FSF_SQ_CFDC_SUBTABLE_OS:
1832                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1833                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1834                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1835                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1836                                         zfcp_act_subtable_type[subtable], rule);
1837                                 break;
1838                         }
1839                 }
1840                 if (port != NULL)
1841                         zfcp_erp_port_access_denied(port, 56, fsf_req);
1842                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1843                 break;
1844
1845         default:
1846                 ZFCP_LOG_NORMAL(
1847                         "bug: An unknown FSF Status was presented "
1848                         "(adapter: %s, fsf_status=0x%08x)\n",
1849                         zfcp_get_busid_by_adapter(adapter),
1850                         header->fsf_status);
1851                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1852                 break;
1853         }
1854
1855 skip_fsfstatus:
1856         send_els->status = retval;
1857
1858         if (send_els->handler)
1859                 send_els->handler(send_els->handler_data);
1860
1861         return retval;
1862 }
1863
1864 int
1865 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1866 {
1867         volatile struct qdio_buffer_element *sbale;
1868         struct zfcp_fsf_req *fsf_req;
1869         struct zfcp_adapter *adapter = erp_action->adapter;
1870         unsigned long lock_flags;
1871         int retval;
1872
1873         /* setup new FSF request */
1874         retval = zfcp_fsf_req_create(adapter,
1875                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1876                                      ZFCP_REQ_AUTO_CLEANUP,
1877                                      adapter->pool.fsf_req_erp,
1878                                      &lock_flags, &fsf_req);
1879         if (retval) {
1880                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1881                               "data request for adapter %s.\n",
1882                               zfcp_get_busid_by_adapter(adapter));
1883                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1884                                         lock_flags);
1885                 return retval;
1886         }
1887
1888         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1889         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1890         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1891
1892         fsf_req->qtcb->bottom.config.feature_selection =
1893                         FSF_FEATURE_CFDC |
1894                         FSF_FEATURE_LUN_SHARING |
1895                         FSF_FEATURE_NOTIFICATION_LOST |
1896                         FSF_FEATURE_UPDATE_ALERT;
1897         fsf_req->erp_action = erp_action;
1898         erp_action->fsf_req = fsf_req;
1899
1900         zfcp_erp_start_timer(fsf_req);
1901         retval = zfcp_fsf_req_send(fsf_req);
1902         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1903                                 lock_flags);
1904         if (retval) {
1905                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1906                               "data command on the adapter %s\n",
1907                               zfcp_get_busid_by_adapter(adapter));
1908                 zfcp_fsf_req_free(fsf_req);
1909                 erp_action->fsf_req = NULL;
1910         }
1911         else
1912                 ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1913                                "(adapter %s)\n",
1914                                zfcp_get_busid_by_adapter(adapter));
1915
1916         return retval;
1917 }
1918
1919 int
1920 zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1921                                 struct fsf_qtcb_bottom_config *data)
1922 {
1923         volatile struct qdio_buffer_element *sbale;
1924         struct zfcp_fsf_req *fsf_req;
1925         unsigned long lock_flags;
1926         int retval;
1927
1928         /* setup new FSF request */
1929         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1930                                      0, NULL, &lock_flags, &fsf_req);
1931         if (retval) {
1932                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1933                               "data request for adapter %s.\n",
1934                               zfcp_get_busid_by_adapter(adapter));
1935                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1936                                         lock_flags);
1937                 return retval;
1938         }
1939
1940         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1941         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1942         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1943
1944         fsf_req->qtcb->bottom.config.feature_selection =
1945                         FSF_FEATURE_CFDC |
1946                         FSF_FEATURE_LUN_SHARING |
1947                         FSF_FEATURE_NOTIFICATION_LOST |
1948                         FSF_FEATURE_UPDATE_ALERT;
1949
1950         if (data)
1951                 fsf_req->data = (unsigned long) data;
1952
1953         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1954         retval = zfcp_fsf_req_send(fsf_req);
1955         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1956                                 lock_flags);
1957         if (retval)
1958                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1959                               "data command on the adapter %s\n",
1960                               zfcp_get_busid_by_adapter(adapter));
1961         else
1962                 wait_event(fsf_req->completion_wq,
1963                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1964
1965         zfcp_fsf_req_free(fsf_req);
1966
1967         return retval;
1968 }
1969
1970 /**
1971  * zfcp_fsf_exchange_config_evaluate
1972  * @fsf_req: fsf_req which belongs to xchg config data request
1973  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1974  *
1975  * returns: -EIO on error, 0 otherwise
1976  */
1977 static int
1978 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
1979 {
1980         struct fsf_qtcb_bottom_config *bottom;
1981         struct zfcp_adapter *adapter = fsf_req->adapter;
1982         struct Scsi_Host *shost = adapter->scsi_host;
1983
1984         bottom = &fsf_req->qtcb->bottom.config;
1985         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
1986                        bottom->low_qtcb_version, bottom->high_qtcb_version);
1987         adapter->fsf_lic_version = bottom->lic_version;
1988         adapter->adapter_features = bottom->adapter_features;
1989         adapter->connection_features = bottom->connection_features;
1990         adapter->peer_wwpn = 0;
1991         adapter->peer_wwnn = 0;
1992         adapter->peer_d_id = 0;
1993
1994         if (xchg_ok) {
1995
1996                 if (fsf_req->data)
1997                         memcpy((struct fsf_qtcb_bottom_config *) fsf_req->data,
1998                                 bottom, sizeof (struct fsf_qtcb_bottom_config));
1999
2000                 fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
2001                 fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
2002                 fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
2003                 fc_host_speed(shost) = bottom->fc_link_speed;
2004                 fc_host_supported_classes(shost) =
2005                                 FC_COS_CLASS2 | FC_COS_CLASS3;
2006                 adapter->hydra_version = bottom->adapter_type;
2007                 if (fc_host_permanent_port_name(shost) == -1)
2008                         fc_host_permanent_port_name(shost) =
2009                                 fc_host_port_name(shost);
2010                 if (bottom->fc_topology == FSF_TOPO_P2P) {
2011                         adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2012                         adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2013                         adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2014                         fc_host_port_type(shost) = FC_PORTTYPE_PTP;
2015                 } else if (bottom->fc_topology == FSF_TOPO_FABRIC)
2016                         fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
2017                 else if (bottom->fc_topology == FSF_TOPO_AL)
2018                         fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
2019                 else
2020                         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2021         } else {
2022                 fc_host_node_name(shost) = 0;
2023                 fc_host_port_name(shost) = 0;
2024                 fc_host_port_id(shost) = 0;
2025                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
2026                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2027                 adapter->hydra_version = 0;
2028         }
2029
2030         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
2031                 adapter->hardware_version = bottom->hardware_version;
2032                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
2033                        min(FC_SERIAL_NUMBER_SIZE, 17));
2034                 EBCASC(fc_host_serial_number(shost),
2035                        min(FC_SERIAL_NUMBER_SIZE, 17));
2036         }
2037
2038         ZFCP_LOG_NORMAL("The adapter %s reported the following "
2039                         "characteristics:\n"
2040                         "WWNN 0x%016Lx, "
2041                         "WWPN 0x%016Lx, "
2042                         "S_ID 0x%06x,\n"
2043                         "adapter version 0x%x, "
2044                         "LIC version 0x%x, "
2045                         "FC link speed %d Gb/s\n",
2046                         zfcp_get_busid_by_adapter(adapter),
2047                         (wwn_t) fc_host_node_name(shost),
2048                         (wwn_t) fc_host_port_name(shost),
2049                         fc_host_port_id(shost),
2050                         adapter->hydra_version,
2051                         adapter->fsf_lic_version,
2052                         fc_host_speed(shost));
2053         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2054                 ZFCP_LOG_NORMAL("error: the adapter %s "
2055                                 "only supports newer control block "
2056                                 "versions in comparison to this device "
2057                                 "driver (try updated device driver)\n",
2058                                 zfcp_get_busid_by_adapter(adapter));
2059                 zfcp_erp_adapter_shutdown(adapter, 0, 125, fsf_req);
2060                 return -EIO;
2061         }
2062         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2063                 ZFCP_LOG_NORMAL("error: the adapter %s "
2064                                 "only supports older control block "
2065                                 "versions than this device driver uses"
2066                                 "(consider a microcode upgrade)\n",
2067                                 zfcp_get_busid_by_adapter(adapter));
2068                 zfcp_erp_adapter_shutdown(adapter, 0, 126, fsf_req);
2069                 return -EIO;
2070         }
2071         return 0;
2072 }
2073
2074 /**
2075  * function:    zfcp_fsf_exchange_config_data_handler
2076  *
2077  * purpose:     is called for finished Exchange Configuration Data command
2078  *
2079  * returns:
2080  */
2081 static int
2082 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2083 {
2084         struct fsf_qtcb_bottom_config *bottom;
2085         struct zfcp_adapter *adapter = fsf_req->adapter;
2086         struct fsf_qtcb *qtcb = fsf_req->qtcb;
2087
2088         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2089                 return -EIO;
2090
2091         switch (qtcb->header.fsf_status) {
2092
2093         case FSF_GOOD:
2094                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2095                         return -EIO;
2096
2097                 switch (fc_host_port_type(adapter->scsi_host)) {
2098                 case FC_PORTTYPE_PTP:
2099                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2100                                         "configuration detected at adapter %s\n"
2101                                         "Peer WWNN 0x%016llx, "
2102                                         "peer WWPN 0x%016llx, "
2103                                         "peer d_id 0x%06x\n",
2104                                         zfcp_get_busid_by_adapter(adapter),
2105                                         adapter->peer_wwnn,
2106                                         adapter->peer_wwpn,
2107                                         adapter->peer_d_id);
2108                         break;
2109                 case FC_PORTTYPE_NLPORT:
2110                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2111                                         "topology detected at adapter %s "
2112                                         "unsupported, shutting down adapter\n",
2113                                         zfcp_get_busid_by_adapter(adapter));
2114                         zfcp_erp_adapter_shutdown(adapter, 0, 127, fsf_req);
2115                         return -EIO;
2116                 case FC_PORTTYPE_NPORT:
2117                         ZFCP_LOG_NORMAL("Switched fabric fibrechannel "
2118                                         "network detected at adapter %s.\n",
2119                                         zfcp_get_busid_by_adapter(adapter));
2120                         break;
2121                 default:
2122                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2123                                         "reported by the exchange "
2124                                         "configuration command for "
2125                                         "the adapter %s is not "
2126                                         "of a type known to the zfcp "
2127                                         "driver, shutting down adapter\n",
2128                                         zfcp_get_busid_by_adapter(adapter));
2129                         zfcp_erp_adapter_shutdown(adapter, 0, 128, fsf_req);
2130                         return -EIO;
2131                 }
2132                 bottom = &qtcb->bottom.config;
2133                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2134                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2135                                         "allowed by the adapter %s "
2136                                         "is lower than the minimum "
2137                                         "required by the driver (%ld bytes).\n",
2138                                         bottom->max_qtcb_size,
2139                                         zfcp_get_busid_by_adapter(adapter),
2140                                         sizeof(struct fsf_qtcb));
2141                         zfcp_erp_adapter_shutdown(adapter, 0, 129, fsf_req);
2142                         return -EIO;
2143                 }
2144                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2145                                 &adapter->status);
2146                 break;
2147         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2148                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2149                         return -EIO;
2150
2151                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2152                                 &adapter->status);
2153
2154                 zfcp_fsf_link_down_info_eval(fsf_req, 42,
2155                         &qtcb->header.fsf_status_qual.link_down_info);
2156                 break;
2157         default:
2158                 zfcp_erp_adapter_shutdown(adapter, 0, 130, fsf_req);
2159                 return -EIO;
2160         }
2161         return 0;
2162 }
2163
2164 /**
2165  * zfcp_fsf_exchange_port_data - request information about local port
2166  * @erp_action: ERP action for the adapter for which port data is requested
2167  */
2168 int
2169 zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
2170 {
2171         volatile struct qdio_buffer_element *sbale;
2172         struct zfcp_fsf_req *fsf_req;
2173         struct zfcp_adapter *adapter = erp_action->adapter;
2174         unsigned long lock_flags;
2175         int retval;
2176
2177         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2178                 ZFCP_LOG_INFO("error: exchange port data "
2179                               "command not supported by adapter %s\n",
2180                               zfcp_get_busid_by_adapter(adapter));
2181                 return -EOPNOTSUPP;
2182         }
2183
2184         /* setup new FSF request */
2185         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2186                                      ZFCP_REQ_AUTO_CLEANUP,
2187                                      adapter->pool.fsf_req_erp,
2188                                      &lock_flags, &fsf_req);
2189         if (retval) {
2190                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2191                               "exchange port data request for "
2192                               "the adapter %s.\n",
2193                               zfcp_get_busid_by_adapter(adapter));
2194                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2195                                         lock_flags);
2196                 return retval;
2197         }
2198
2199         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2200         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2201         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2202
2203         erp_action->fsf_req = fsf_req;
2204         fsf_req->erp_action = erp_action;
2205         zfcp_erp_start_timer(fsf_req);
2206
2207         retval = zfcp_fsf_req_send(fsf_req);
2208         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2209
2210         if (retval) {
2211                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2212                               "command on the adapter %s\n",
2213                               zfcp_get_busid_by_adapter(adapter));
2214                 zfcp_fsf_req_free(fsf_req);
2215                 erp_action->fsf_req = NULL;
2216         }
2217         else
2218                 ZFCP_LOG_DEBUG("exchange port data request initiated "
2219                                "(adapter %s)\n",
2220                                zfcp_get_busid_by_adapter(adapter));
2221         return retval;
2222 }
2223
2224
2225 /**
2226  * zfcp_fsf_exchange_port_data_sync - request information about local port
2227  * and wait until information is ready
2228  */
2229 int
2230 zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
2231                                 struct fsf_qtcb_bottom_port *data)
2232 {
2233         volatile struct qdio_buffer_element *sbale;
2234         struct zfcp_fsf_req *fsf_req;
2235         unsigned long lock_flags;
2236         int retval;
2237
2238         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2239                 ZFCP_LOG_INFO("error: exchange port data "
2240                               "command not supported by adapter %s\n",
2241                               zfcp_get_busid_by_adapter(adapter));
2242                 return -EOPNOTSUPP;
2243         }
2244
2245         /* setup new FSF request */
2246         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2247                                 0, NULL, &lock_flags, &fsf_req);
2248         if (retval) {
2249                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2250                               "exchange port data request for "
2251                               "the adapter %s.\n",
2252                               zfcp_get_busid_by_adapter(adapter));
2253                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2254                                         lock_flags);
2255                 return retval;
2256         }
2257
2258         if (data)
2259                 fsf_req->data = (unsigned long) data;
2260
2261         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2262         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2263         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2264
2265         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
2266         retval = zfcp_fsf_req_send(fsf_req);
2267         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2268
2269         if (retval)
2270                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2271                               "command on the adapter %s\n",
2272                               zfcp_get_busid_by_adapter(adapter));
2273         else
2274                 wait_event(fsf_req->completion_wq,
2275                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2276
2277         zfcp_fsf_req_free(fsf_req);
2278
2279         return retval;
2280 }
2281
2282 /**
2283  * zfcp_fsf_exchange_port_evaluate
2284  * @fsf_req: fsf_req which belongs to xchg port data request
2285  * @xchg_ok: specifies if xchg port data was incomplete or complete (0/1)
2286  */
2287 static void
2288 zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
2289 {
2290         struct zfcp_adapter *adapter;
2291         struct fsf_qtcb_bottom_port *bottom;
2292         struct Scsi_Host *shost;
2293
2294         adapter = fsf_req->adapter;
2295         bottom = &fsf_req->qtcb->bottom.port;
2296         shost = adapter->scsi_host;
2297
2298         if (fsf_req->data)
2299                 memcpy((struct fsf_qtcb_bottom_port*) fsf_req->data, bottom,
2300                         sizeof(struct fsf_qtcb_bottom_port));
2301
2302         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
2303                 fc_host_permanent_port_name(shost) = bottom->wwpn;
2304         else
2305                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
2306         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
2307         fc_host_supported_speeds(shost) = bottom->supported_speed;
2308 }
2309
2310 /**
2311  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2312  * @fsf_req: pointer to struct zfcp_fsf_req
2313  */
2314 static void
2315 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2316 {
2317         struct zfcp_adapter *adapter;
2318         struct fsf_qtcb *qtcb;
2319
2320         adapter = fsf_req->adapter;
2321         qtcb = fsf_req->qtcb;
2322
2323         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2324                 return;
2325
2326         switch (qtcb->header.fsf_status) {
2327         case FSF_GOOD:
2328                 zfcp_fsf_exchange_port_evaluate(fsf_req, 1);
2329                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2330                 break;
2331         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2332                 zfcp_fsf_exchange_port_evaluate(fsf_req, 0);
2333                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2334                 zfcp_fsf_link_down_info_eval(fsf_req, 43,
2335                         &qtcb->header.fsf_status_qual.link_down_info);
2336                 break;
2337         }
2338 }
2339
2340
2341 /*
2342  * function:    zfcp_fsf_open_port
2343  *
2344  * purpose:
2345  *
2346  * returns:     address of initiated FSF request
2347  *              NULL - request could not be initiated
2348  */
2349 int
2350 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2351 {
2352         volatile struct qdio_buffer_element *sbale;
2353         struct zfcp_fsf_req *fsf_req;
2354         unsigned long lock_flags;
2355         int retval = 0;
2356
2357         /* setup new FSF request */
2358         retval = zfcp_fsf_req_create(erp_action->adapter,
2359                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2360                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2361                                      erp_action->adapter->pool.fsf_req_erp,
2362                                      &lock_flags, &fsf_req);
2363         if (retval < 0) {
2364                 ZFCP_LOG_INFO("error: Could not create open port request "
2365                               "for port 0x%016Lx on adapter %s.\n",
2366                               erp_action->port->wwpn,
2367                               zfcp_get_busid_by_adapter(erp_action->adapter));
2368                 goto out;
2369         }
2370
2371         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2372         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2373         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2374
2375         fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2376         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2377         fsf_req->data = (unsigned long) erp_action->port;
2378         fsf_req->erp_action = erp_action;
2379         erp_action->fsf_req = fsf_req;
2380
2381         zfcp_erp_start_timer(fsf_req);
2382         retval = zfcp_fsf_req_send(fsf_req);
2383         if (retval) {
2384                 ZFCP_LOG_INFO("error: Could not send open port request for "
2385                               "port 0x%016Lx on adapter %s.\n",
2386                               erp_action->port->wwpn,
2387                               zfcp_get_busid_by_adapter(erp_action->adapter));
2388                 zfcp_fsf_req_free(fsf_req);
2389                 erp_action->fsf_req = NULL;
2390                 goto out;
2391         }
2392
2393         ZFCP_LOG_DEBUG("open port request initiated "
2394                        "(adapter %s,  port 0x%016Lx)\n",
2395                        zfcp_get_busid_by_adapter(erp_action->adapter),
2396                        erp_action->port->wwpn);
2397  out:
2398         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2399                                 lock_flags);
2400         return retval;
2401 }
2402
2403 /*
2404  * function:    zfcp_fsf_open_port_handler
2405  *
2406  * purpose:     is called for finished Open Port command
2407  *
2408  * returns:
2409  */
2410 static int
2411 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2412 {
2413         int retval = -EINVAL;
2414         struct zfcp_port *port;
2415         struct fsf_plogi *plogi;
2416         struct fsf_qtcb_header *header;
2417         u16 subtable, rule, counter;
2418
2419         port = (struct zfcp_port *) fsf_req->data;
2420         header = &fsf_req->qtcb->header;
2421
2422         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2423                 /* don't change port status in our bookkeeping */
2424                 goto skip_fsfstatus;
2425         }
2426
2427         /* evaluate FSF status in QTCB */
2428         switch (header->fsf_status) {
2429
2430         case FSF_PORT_ALREADY_OPEN:
2431                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2432                                 "is already open.\n",
2433                                 port->wwpn, zfcp_get_busid_by_port(port));
2434                 /*
2435                  * This is a bug, however operation should continue normally
2436                  * if it is simply ignored
2437                  */
2438                 break;
2439
2440         case FSF_ACCESS_DENIED:
2441                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2442                                 "on adapter %s\n",
2443                                 port->wwpn, zfcp_get_busid_by_port(port));
2444                 for (counter = 0; counter < 2; counter++) {
2445                         subtable = header->fsf_status_qual.halfword[counter * 2];
2446                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2447                         switch (subtable) {
2448                         case FSF_SQ_CFDC_SUBTABLE_OS:
2449                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2450                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2451                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2452                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2453                                         zfcp_act_subtable_type[subtable], rule);
2454                                 break;
2455                         }
2456                 }
2457                 zfcp_erp_port_access_denied(port, 57, fsf_req);
2458                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2459                 break;
2460
2461         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2462                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2463                               "The remote port 0x%016Lx on adapter %s "
2464                               "could not be opened. Disabling it.\n",
2465                               port->wwpn, zfcp_get_busid_by_port(port));
2466                 zfcp_erp_port_failed(port, 31, fsf_req);
2467                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2468                 break;
2469
2470         case FSF_ADAPTER_STATUS_AVAILABLE:
2471                 switch (header->fsf_status_qual.word[0]) {
2472                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2473                         /* ERP strategy will escalate */
2474                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2475                         break;
2476                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2477                         /* ERP strategy will escalate */
2478                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2479                         break;
2480                 case FSF_SQ_NO_RETRY_POSSIBLE:
2481                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2482                                         "adapter %s could not be opened. "
2483                                         "Disabling it.\n",
2484                                         port->wwpn,
2485                                         zfcp_get_busid_by_port(port));
2486                         zfcp_erp_port_failed(port, 32, fsf_req);
2487                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2488                         break;
2489                 default:
2490                         ZFCP_LOG_NORMAL
2491                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2492                              header->fsf_status_qual.word[0]);
2493                         break;
2494                 }
2495                 break;
2496
2497         case FSF_GOOD:
2498                 /* save port handle assigned by FSF */
2499                 port->handle = header->port_handle;
2500                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2501                               "was opened, it's port handle is 0x%x\n",
2502                               port->wwpn, zfcp_get_busid_by_port(port),
2503                               port->handle);
2504                 /* mark port as open */
2505                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2506                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2507                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2508                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2509                                   &port->status);
2510                 retval = 0;
2511                 /* check whether D_ID has changed during open */
2512                 /*
2513                  * FIXME: This check is not airtight, as the FCP channel does
2514                  * not monitor closures of target port connections caused on
2515                  * the remote side. Thus, they might miss out on invalidating
2516                  * locally cached WWPNs (and other N_Port parameters) of gone
2517                  * target ports. So, our heroic attempt to make things safe
2518                  * could be undermined by 'open port' response data tagged with
2519                  * obsolete WWPNs. Another reason to monitor potential
2520                  * connection closures ourself at least (by interpreting
2521                  * incoming ELS' and unsolicited status). It just crosses my
2522                  * mind that one should be able to cross-check by means of
2523                  * another GID_PN straight after a port has been opened.
2524                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2525                  */
2526                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2527                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2528                 {
2529                         if (fsf_req->qtcb->bottom.support.els1_length <
2530                             sizeof (struct fsf_plogi)) {
2531                                 ZFCP_LOG_INFO(
2532                                         "warning: insufficient length of "
2533                                         "PLOGI payload (%i)\n",
2534                                         fsf_req->qtcb->bottom.support.els1_length);
2535                                 /* skip sanity check and assume wwpn is ok */
2536                         } else {
2537                                 if (plogi->serv_param.wwpn != port->wwpn) {
2538                                         ZFCP_LOG_INFO("warning: d_id of port "
2539                                                       "0x%016Lx changed during "
2540                                                       "open\n", port->wwpn);
2541                                         atomic_clear_mask(
2542                                                 ZFCP_STATUS_PORT_DID_DID,
2543                                                 &port->status);
2544                                 } else {
2545                                         port->wwnn = plogi->serv_param.wwnn;
2546                                         zfcp_plogi_evaluate(port, plogi);
2547                                 }
2548                         }
2549                 }
2550                 break;
2551
2552         case FSF_UNKNOWN_OP_SUBTYPE:
2553                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2554                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2555                               "op_subtype=0x%x)\n",
2556                               zfcp_get_busid_by_port(port),
2557                               fsf_req->qtcb->bottom.support.operation_subtype);
2558                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2559                 break;
2560
2561         default:
2562                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2563                                 "(debug info 0x%x)\n",
2564                                 header->fsf_status);
2565                 break;
2566         }
2567
2568  skip_fsfstatus:
2569         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2570         return retval;
2571 }
2572
2573 /*
2574  * function:    zfcp_fsf_close_port
2575  *
2576  * purpose:     submit FSF command "close port"
2577  *
2578  * returns:     address of initiated FSF request
2579  *              NULL - request could not be initiated
2580  */
2581 int
2582 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2583 {
2584         volatile struct qdio_buffer_element *sbale;
2585         struct zfcp_fsf_req *fsf_req;
2586         unsigned long lock_flags;
2587         int retval = 0;
2588
2589         /* setup new FSF request */
2590         retval = zfcp_fsf_req_create(erp_action->adapter,
2591                                      FSF_QTCB_CLOSE_PORT,
2592                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2593                                      erp_action->adapter->pool.fsf_req_erp,
2594                                      &lock_flags, &fsf_req);
2595         if (retval < 0) {
2596                 ZFCP_LOG_INFO("error: Could not create a close port request "
2597                               "for port 0x%016Lx on adapter %s.\n",
2598                               erp_action->port->wwpn,
2599                               zfcp_get_busid_by_adapter(erp_action->adapter));
2600                 goto out;
2601         }
2602
2603         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2604         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2605         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2606
2607         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2608         fsf_req->data = (unsigned long) erp_action->port;
2609         fsf_req->erp_action = erp_action;
2610         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2611         fsf_req->erp_action = erp_action;
2612         erp_action->fsf_req = fsf_req;
2613
2614         zfcp_erp_start_timer(fsf_req);
2615         retval = zfcp_fsf_req_send(fsf_req);
2616         if (retval) {
2617                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2618                               "port 0x%016Lx on adapter %s.\n",
2619                               erp_action->port->wwpn,
2620                               zfcp_get_busid_by_adapter(erp_action->adapter));
2621                 zfcp_fsf_req_free(fsf_req);
2622                 erp_action->fsf_req = NULL;
2623                 goto out;
2624         }
2625
2626         ZFCP_LOG_TRACE("close port request initiated "
2627                        "(adapter %s, port 0x%016Lx)\n",
2628                        zfcp_get_busid_by_adapter(erp_action->adapter),
2629                        erp_action->port->wwpn);
2630  out:
2631         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2632                                 lock_flags);
2633         return retval;
2634 }
2635
2636 /*
2637  * function:    zfcp_fsf_close_port_handler
2638  *
2639  * purpose:     is called for finished Close Port FSF command
2640  *
2641  * returns:
2642  */
2643 static int
2644 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2645 {
2646         int retval = -EINVAL;
2647         struct zfcp_port *port;
2648
2649         port = (struct zfcp_port *) fsf_req->data;
2650
2651         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2652                 /* don't change port status in our bookkeeping */
2653                 goto skip_fsfstatus;
2654         }
2655
2656         /* evaluate FSF status in QTCB */
2657         switch (fsf_req->qtcb->header.fsf_status) {
2658
2659         case FSF_PORT_HANDLE_NOT_VALID:
2660                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2661                               "0x%016Lx on adapter %s invalid. This may happen "
2662                               "occasionally.\n", port->handle,
2663                               port->wwpn, zfcp_get_busid_by_port(port));
2664                 ZFCP_LOG_DEBUG("status qualifier:\n");
2665                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2666                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2667                               sizeof (union fsf_status_qual));
2668                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, fsf_req);
2669                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2670                 break;
2671
2672         case FSF_ADAPTER_STATUS_AVAILABLE:
2673                 /* Note: FSF has actually closed the port in this case.
2674                  * The status code is just daft. Fingers crossed for a change
2675                  */
2676                 retval = 0;
2677                 break;
2678
2679         case FSF_GOOD:
2680                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2681                                "port handle 0x%x\n", port->wwpn,
2682                                zfcp_get_busid_by_port(port), port->handle);
2683                 zfcp_erp_modify_port_status(port, 33, fsf_req,
2684                                             ZFCP_STATUS_COMMON_OPEN,
2685                                             ZFCP_CLEAR);
2686                 retval = 0;
2687                 break;
2688
2689         default:
2690                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2691                                 "(debug info 0x%x)\n",
2692                                 fsf_req->qtcb->header.fsf_status);
2693                 break;
2694         }
2695
2696  skip_fsfstatus:
2697         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2698         return retval;
2699 }
2700
2701 /*
2702  * function:    zfcp_fsf_close_physical_port
2703  *
2704  * purpose:     submit FSF command "close physical port"
2705  *
2706  * returns:     address of initiated FSF request
2707  *              NULL - request could not be initiated
2708  */
2709 int
2710 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2711 {
2712         volatile struct qdio_buffer_element *sbale;
2713         struct zfcp_fsf_req *fsf_req;
2714         unsigned long lock_flags;
2715         int retval = 0;
2716
2717         /* setup new FSF request */
2718         retval = zfcp_fsf_req_create(erp_action->adapter,
2719                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2720                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2721                                      erp_action->adapter->pool.fsf_req_erp,
2722                                      &lock_flags, &fsf_req);
2723         if (retval < 0) {
2724                 ZFCP_LOG_INFO("error: Could not create close physical port "
2725                               "request (adapter %s, port 0x%016Lx)\n",
2726                               zfcp_get_busid_by_adapter(erp_action->adapter),
2727                               erp_action->port->wwpn);
2728
2729                 goto out;
2730         }
2731
2732         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2733         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2734         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2735
2736         /* mark port as being closed */
2737         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2738                         &erp_action->port->status);
2739         /* save a pointer to this port */
2740         fsf_req->data = (unsigned long) erp_action->port;
2741         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2742         fsf_req->erp_action = erp_action;
2743         erp_action->fsf_req = fsf_req;
2744
2745         zfcp_erp_start_timer(fsf_req);
2746         retval = zfcp_fsf_req_send(fsf_req);
2747         if (retval) {
2748                 ZFCP_LOG_INFO("error: Could not send close physical port "
2749                               "request (adapter %s, port 0x%016Lx)\n",
2750                               zfcp_get_busid_by_adapter(erp_action->adapter),
2751                               erp_action->port->wwpn);
2752                 zfcp_fsf_req_free(fsf_req);
2753                 erp_action->fsf_req = NULL;
2754                 goto out;
2755         }
2756
2757         ZFCP_LOG_TRACE("close physical port request initiated "
2758                        "(adapter %s, port 0x%016Lx)\n",
2759                        zfcp_get_busid_by_adapter(erp_action->adapter),
2760                        erp_action->port->wwpn);
2761  out:
2762         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2763                                 lock_flags);
2764         return retval;
2765 }
2766
2767 /*
2768  * function:    zfcp_fsf_close_physical_port_handler
2769  *
2770  * purpose:     is called for finished Close Physical Port FSF command
2771  *
2772  * returns:
2773  */
2774 static int
2775 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2776 {
2777         int retval = -EINVAL;
2778         struct zfcp_port *port;
2779         struct zfcp_unit *unit;
2780         struct fsf_qtcb_header *header;
2781         u16 subtable, rule, counter;
2782
2783         port = (struct zfcp_port *) fsf_req->data;
2784         header = &fsf_req->qtcb->header;
2785
2786         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2787                 /* don't change port status in our bookkeeping */
2788                 goto skip_fsfstatus;
2789         }
2790
2791         /* evaluate FSF status in QTCB */
2792         switch (header->fsf_status) {
2793
2794         case FSF_PORT_HANDLE_NOT_VALID:
2795                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2796                               "(adapter %s, port 0x%016Lx). "
2797                               "This may happen occasionally.\n",
2798                               port->handle,
2799                               zfcp_get_busid_by_port(port),
2800                               port->wwpn);
2801                 ZFCP_LOG_DEBUG("status qualifier:\n");
2802                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2803                               (char *) &header->fsf_status_qual,
2804                               sizeof (union fsf_status_qual));
2805                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, fsf_req);
2806                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2807                 break;
2808
2809         case FSF_ACCESS_DENIED:
2810                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2811                                 "physical port 0x%016Lx on adapter %s\n",
2812                                 port->wwpn, zfcp_get_busid_by_port(port));
2813                 for (counter = 0; counter < 2; counter++) {
2814                         subtable = header->fsf_status_qual.halfword[counter * 2];
2815                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2816                         switch (subtable) {
2817                         case FSF_SQ_CFDC_SUBTABLE_OS:
2818                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2819                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2820                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2821                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2822                                         zfcp_act_subtable_type[subtable], rule);
2823                                 break;
2824                         }
2825                 }
2826                 zfcp_erp_port_access_denied(port, 58, fsf_req);
2827                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2828                 break;
2829
2830         case FSF_PORT_BOXED:
2831                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2832                                "%s needs to be reopened but it was attempted "
2833                                "to close it physically.\n",
2834                                port->wwpn,
2835                                zfcp_get_busid_by_port(port));
2836                 zfcp_erp_port_boxed(port, 50, fsf_req);
2837                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2838                         ZFCP_STATUS_FSFREQ_RETRY;
2839
2840                 /* can't use generic zfcp_erp_modify_port_status because
2841                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
2842                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2843                 list_for_each_entry(unit, &port->unit_list_head, list)
2844                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
2845                                           &unit->status);
2846                 break;
2847
2848         case FSF_ADAPTER_STATUS_AVAILABLE:
2849                 switch (header->fsf_status_qual.word[0]) {
2850                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2851                         /* This will now be escalated by ERP */
2852                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2853                         break;
2854                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2855                         /* ERP strategy will escalate */
2856                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2857                         break;
2858                 default:
2859                         ZFCP_LOG_NORMAL
2860                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2861                              header->fsf_status_qual.word[0]);
2862                         break;
2863                 }
2864                 break;
2865
2866         case FSF_GOOD:
2867                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2868                                "physically closed, port handle 0x%x\n",
2869                                port->wwpn,
2870                                zfcp_get_busid_by_port(port), port->handle);
2871                 /* can't use generic zfcp_erp_modify_port_status because
2872                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2873                  */
2874                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2875                 list_for_each_entry(unit, &port->unit_list_head, list)
2876                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2877                 retval = 0;
2878                 break;
2879
2880         default:
2881                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2882                                 "(debug info 0x%x)\n",
2883                                 header->fsf_status);
2884                 break;
2885         }
2886
2887  skip_fsfstatus:
2888         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2889         return retval;
2890 }
2891
2892 /*
2893  * function:    zfcp_fsf_open_unit
2894  *
2895  * purpose:
2896  *
2897  * returns:
2898  *
2899  * assumptions: This routine does not check whether the associated
2900  *              remote port has already been opened. This should be
2901  *              done by calling routines. Otherwise some status
2902  *              may be presented by FSF
2903  */
2904 int
2905 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2906 {
2907         volatile struct qdio_buffer_element *sbale;
2908         struct zfcp_fsf_req *fsf_req;
2909         unsigned long lock_flags;
2910         int retval = 0;
2911
2912         /* setup new FSF request */
2913         retval = zfcp_fsf_req_create(erp_action->adapter,
2914                                      FSF_QTCB_OPEN_LUN,
2915                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2916                                      erp_action->adapter->pool.fsf_req_erp,
2917                                      &lock_flags, &fsf_req);
2918         if (retval < 0) {
2919                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2920                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2921                               erp_action->unit->fcp_lun,
2922                               erp_action->unit->port->wwpn,
2923                               zfcp_get_busid_by_adapter(erp_action->adapter));
2924                 goto out;
2925         }
2926
2927         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2928         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2929         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2930
2931         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2932         fsf_req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
2933         if (!(erp_action->adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2934                 fsf_req->qtcb->bottom.support.option =
2935                         FSF_OPEN_LUN_SUPPRESS_BOXING;
2936         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2937         fsf_req->data = (unsigned long) erp_action->unit;
2938         fsf_req->erp_action = erp_action;
2939         erp_action->fsf_req = fsf_req;
2940
2941         zfcp_erp_start_timer(fsf_req);
2942         retval = zfcp_fsf_req_send(erp_action->fsf_req);
2943         if (retval) {
2944                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2945                               "on the adapter %s, port 0x%016Lx for "
2946                               "unit 0x%016Lx\n",
2947                               zfcp_get_busid_by_adapter(erp_action->adapter),
2948                               erp_action->port->wwpn,
2949                               erp_action->unit->fcp_lun);
2950                 zfcp_fsf_req_free(fsf_req);
2951                 erp_action->fsf_req = NULL;
2952                 goto out;
2953         }
2954
2955         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2956                        "port 0x%016Lx, unit 0x%016Lx)\n",
2957                        zfcp_get_busid_by_adapter(erp_action->adapter),
2958                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2959  out:
2960         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2961                                 lock_flags);
2962         return retval;
2963 }
2964
2965 /*
2966  * function:    zfcp_fsf_open_unit_handler
2967  *
2968  * purpose:     is called for finished Open LUN command
2969  *
2970  * returns:
2971  */
2972 static int
2973 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2974 {
2975         int retval = -EINVAL;
2976         struct zfcp_adapter *adapter;
2977         struct zfcp_unit *unit;
2978         struct fsf_qtcb_header *header;
2979         struct fsf_qtcb_bottom_support *bottom;
2980         struct fsf_queue_designator *queue_designator;
2981         u16 subtable, rule, counter;
2982         int exclusive, readwrite;
2983
2984         unit = (struct zfcp_unit *) fsf_req->data;
2985
2986         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2987                 /* don't change unit status in our bookkeeping */
2988                 goto skip_fsfstatus;
2989         }
2990
2991         adapter = fsf_req->adapter;
2992         header = &fsf_req->qtcb->header;
2993         bottom = &fsf_req->qtcb->bottom.support;
2994         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
2995
2996         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2997                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
2998                           ZFCP_STATUS_UNIT_SHARED |
2999                           ZFCP_STATUS_UNIT_READONLY,
3000                           &unit->status);
3001
3002         /* evaluate FSF status in QTCB */
3003         switch (header->fsf_status) {
3004
3005         case FSF_PORT_HANDLE_NOT_VALID:
3006                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
3007                               "for port 0x%016Lx on adapter %s invalid "
3008                               "This may happen occasionally\n",
3009                               unit->port->handle,
3010                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3011                 ZFCP_LOG_DEBUG("status qualifier:\n");
3012                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3013                               (char *) &header->fsf_status_qual,
3014                               sizeof (union fsf_status_qual));
3015                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, fsf_req);
3016                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3017                 break;
3018
3019         case FSF_LUN_ALREADY_OPEN:
3020                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3021                                 "remote port 0x%016Lx on adapter %s twice.\n",
3022                                 unit->fcp_lun,
3023                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3024                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3025                 break;
3026
3027         case FSF_ACCESS_DENIED:
3028                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3029                                 "remote port 0x%016Lx on adapter %s\n",
3030                                 unit->fcp_lun, unit->port->wwpn,
3031                                 zfcp_get_busid_by_unit(unit));
3032                 for (counter = 0; counter < 2; counter++) {
3033                         subtable = header->fsf_status_qual.halfword[counter * 2];
3034                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3035                         switch (subtable) {
3036                         case FSF_SQ_CFDC_SUBTABLE_OS:
3037                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3038                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3039                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3040                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3041                                         zfcp_act_subtable_type[subtable], rule);
3042                                 break;
3043                         }
3044                 }
3045                 zfcp_erp_unit_access_denied(unit, 59, fsf_req);
3046                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3047                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3048                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3049                 break;
3050
3051         case FSF_PORT_BOXED:
3052                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3053                                "needs to be reopened\n",
3054                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3055                 zfcp_erp_port_boxed(unit->port, 51, fsf_req);
3056                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3057                         ZFCP_STATUS_FSFREQ_RETRY;
3058                 break;
3059
3060         case FSF_LUN_SHARING_VIOLATION:
3061                 if (header->fsf_status_qual.word[0] != 0) {
3062                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3063                                         "with WWPN 0x%Lx "
3064                                         "connected to the adapter %s "
3065                                         "is already in use in LPAR%d, CSS%d\n",
3066                                         unit->fcp_lun,
3067                                         unit->port->wwpn,
3068                                         zfcp_get_busid_by_unit(unit),
3069                                         queue_designator->hla,
3070                                         queue_designator->cssid);
3071                 } else {
3072                         subtable = header->fsf_status_qual.halfword[4];
3073                         rule = header->fsf_status_qual.halfword[5];
3074                         switch (subtable) {
3075                         case FSF_SQ_CFDC_SUBTABLE_OS:
3076                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3077                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3078                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3079                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3080                                                 "remote port with WWPN 0x%Lx "
3081                                                 "connected to the adapter %s "
3082                                                 "is denied (%s rule %d)\n",
3083                                                 unit->fcp_lun,
3084                                                 unit->port->wwpn,
3085                                                 zfcp_get_busid_by_unit(unit),
3086                                                 zfcp_act_subtable_type[subtable],
3087                                                 rule);
3088                                 break;
3089                         }
3090                 }
3091                 ZFCP_LOG_DEBUG("status qualifier:\n");
3092                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3093                               (char *) &header->fsf_status_qual,
3094                               sizeof (union fsf_status_qual));
3095                 zfcp_erp_unit_access_denied(unit, 60, fsf_req);
3096                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3097                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3098                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3099                 break;
3100
3101         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3102                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3103                               "There is no handle (temporary port identifier) "
3104                               "available for unit 0x%016Lx on port 0x%016Lx "
3105                               "on adapter %s\n",
3106                               unit->fcp_lun,
3107                               unit->port->wwpn,
3108                               zfcp_get_busid_by_unit(unit));
3109                 zfcp_erp_unit_failed(unit, 34, fsf_req);
3110                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3111                 break;
3112
3113         case FSF_ADAPTER_STATUS_AVAILABLE:
3114                 switch (header->fsf_status_qual.word[0]) {
3115                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3116                         /* Re-establish link to port */
3117                         zfcp_test_link(unit->port);
3118                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3119                         break;
3120                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3121                         /* ERP strategy will escalate */
3122                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3123                         break;
3124                 default:
3125                         ZFCP_LOG_NORMAL
3126                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3127                              header->fsf_status_qual.word[0]);
3128                 }
3129                 break;
3130
3131         case FSF_INVALID_COMMAND_OPTION:
3132                 ZFCP_LOG_NORMAL(
3133                         "Invalid option 0x%x has been specified "
3134                         "in QTCB bottom sent to the adapter %s\n",
3135                         bottom->option,
3136                         zfcp_get_busid_by_adapter(adapter));
3137                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3138                 retval = -EINVAL;
3139                 break;
3140
3141         case FSF_GOOD:
3142                 /* save LUN handle assigned by FSF */
3143                 unit->handle = header->lun_handle;
3144                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3145                                "adapter %s opened, port handle 0x%x\n",
3146                                unit->fcp_lun,
3147                                unit->port->wwpn,
3148                                zfcp_get_busid_by_unit(unit),
3149                                unit->handle);
3150                 /* mark unit as open */
3151                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3152
3153                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
3154                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
3155                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
3156                         exclusive = (bottom->lun_access_info &
3157                                         FSF_UNIT_ACCESS_EXCLUSIVE);
3158                         readwrite = (bottom->lun_access_info &
3159                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
3160
3161                         if (!exclusive)
3162                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3163                                                 &unit->status);
3164
3165                         if (!readwrite) {
3166                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3167                                                 &unit->status);
3168                                 ZFCP_LOG_NORMAL("read-only access for unit "
3169                                                 "(adapter %s, wwpn=0x%016Lx, "
3170                                                 "fcp_lun=0x%016Lx)\n",
3171                                                 zfcp_get_busid_by_unit(unit),
3172                                                 unit->port->wwpn,
3173                                                 unit->fcp_lun);
3174                         }
3175
3176                         if (exclusive && !readwrite) {
3177                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3178                                                 "unit not supported\n");
3179                                 zfcp_erp_unit_failed(unit, 35, fsf_req);
3180                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3181                                 zfcp_erp_unit_shutdown(unit, 0, 80, fsf_req);
3182                         } else if (!exclusive && readwrite) {
3183                                 ZFCP_LOG_NORMAL("shared access of read-write "
3184                                                 "unit not supported\n");
3185                                 zfcp_erp_unit_failed(unit, 36, fsf_req);
3186                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3187                                 zfcp_erp_unit_shutdown(unit, 0, 81, fsf_req);
3188                         }
3189                 }
3190
3191                 retval = 0;
3192                 break;
3193
3194         default:
3195                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3196                                 "(debug info 0x%x)\n",
3197                                 header->fsf_status);
3198                 break;
3199         }
3200
3201  skip_fsfstatus:
3202         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3203         return retval;
3204 }
3205
3206 /*
3207  * function:    zfcp_fsf_close_unit
3208  *
3209  * purpose:
3210  *
3211  * returns:     address of fsf_req - request successfully initiated
3212  *              NULL -
3213  *
3214  * assumptions: This routine does not check whether the associated
3215  *              remote port/lun has already been opened. This should be
3216  *              done by calling routines. Otherwise some status
3217  *              may be presented by FSF
3218  */
3219 int
3220 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3221 {
3222         volatile struct qdio_buffer_element *sbale;
3223         struct zfcp_fsf_req *fsf_req;
3224         unsigned long lock_flags;
3225         int retval = 0;
3226
3227         /* setup new FSF request */
3228         retval = zfcp_fsf_req_create(erp_action->adapter,
3229                                      FSF_QTCB_CLOSE_LUN,
3230                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3231                                      erp_action->adapter->pool.fsf_req_erp,
3232                                      &lock_flags, &fsf_req);
3233         if (retval < 0) {
3234                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3235                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3236                               erp_action->unit->fcp_lun,
3237                               erp_action->port->wwpn,
3238                               zfcp_get_busid_by_adapter(erp_action->adapter));
3239                 goto out;
3240         }
3241
3242         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3243         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3244         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3245
3246         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
3247         fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3248         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3249         fsf_req->data = (unsigned long) erp_action->unit;
3250         fsf_req->erp_action = erp_action;
3251         erp_action->fsf_req = fsf_req;
3252
3253         zfcp_erp_start_timer(fsf_req);
3254         retval = zfcp_fsf_req_send(erp_action->fsf_req);
3255         if (retval) {
3256                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3257                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3258                               erp_action->unit->fcp_lun,
3259                               erp_action->port->wwpn,
3260                               zfcp_get_busid_by_adapter(erp_action->adapter));
3261                 zfcp_fsf_req_free(fsf_req);
3262                 erp_action->fsf_req = NULL;
3263                 goto out;
3264         }
3265
3266         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3267                        "port 0x%016Lx, unit 0x%016Lx)\n",
3268                        zfcp_get_busid_by_adapter(erp_action->adapter),
3269                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3270  out:
3271         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3272                                 lock_flags);
3273         return retval;
3274 }
3275
3276 /*
3277  * function:    zfcp_fsf_close_unit_handler
3278  *
3279  * purpose:     is called for finished Close LUN FSF command
3280  *
3281  * returns:
3282  */
3283 static int
3284 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3285 {
3286         int retval = -EINVAL;
3287         struct zfcp_unit *unit;
3288
3289         unit = (struct zfcp_unit *) fsf_req->data;
3290
3291         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3292                 /* don't change unit status in our bookkeeping */
3293                 goto skip_fsfstatus;
3294         }
3295
3296         /* evaluate FSF status in QTCB */
3297         switch (fsf_req->qtcb->header.fsf_status) {
3298
3299         case FSF_PORT_HANDLE_NOT_VALID:
3300                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3301                               "0x%016Lx on adapter %s invalid. This may "
3302                               "happen in rare circumstances\n",
3303                               unit->port->handle,
3304                               unit->port->wwpn,
3305                               zfcp_get_busid_by_unit(unit));
3306                 ZFCP_LOG_DEBUG("status qualifier:\n");
3307                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3308                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3309                               sizeof (union fsf_status_qual));
3310                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, fsf_req);
3311                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3312                 break;
3313
3314         case FSF_LUN_HANDLE_NOT_VALID:
3315                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3316                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3317                               "invalid. This may happen occasionally.\n",
3318                               unit->handle,
3319                               unit->fcp_lun,
3320                               unit->port->wwpn,
3321                               zfcp_get_busid_by_unit(unit));
3322                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3323                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3324                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3325                               sizeof (union fsf_status_qual));
3326                 zfcp_erp_port_reopen(unit->port, 0, 111, fsf_req);
3327                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3328                 break;
3329
3330         case FSF_PORT_BOXED:
3331                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3332                                "needs to be reopened\n",
3333                                unit->port->wwpn,
3334                                zfcp_get_busid_by_unit(unit));
3335                 zfcp_erp_port_boxed(unit->port, 52, fsf_req);
3336                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3337                         ZFCP_STATUS_FSFREQ_RETRY;
3338                 break;
3339
3340         case FSF_ADAPTER_STATUS_AVAILABLE:
3341                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3342                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3343                         /* re-establish link to port */
3344                         zfcp_test_link(unit->port);
3345                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3346                         break;
3347                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3348                         /* ERP strategy will escalate */
3349                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3350                         break;
3351                 default:
3352                         ZFCP_LOG_NORMAL
3353                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3354                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3355                         break;
3356                 }
3357                 break;
3358
3359         case FSF_GOOD:
3360                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3361                                "closed, port handle 0x%x\n",
3362                                unit->fcp_lun,
3363                                unit->port->wwpn,
3364                                zfcp_get_busid_by_unit(unit),
3365                                unit->handle);
3366                 /* mark unit as closed */
3367                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3368                 retval = 0;
3369                 break;
3370
3371         default:
3372                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3373                                 "(debug info 0x%x)\n",
3374                                 fsf_req->qtcb->header.fsf_status);
3375                 break;
3376         }
3377
3378  skip_fsfstatus:
3379         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3380         return retval;
3381 }
3382
3383 /**
3384  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3385  * @adapter: adapter where scsi command is issued
3386  * @unit: unit where command is sent to
3387  * @scsi_cmnd: scsi command to be sent
3388  * @timer: timer to be started when request is initiated
3389  * @req_flags: flags for fsf_request
3390  */
3391 int
3392 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3393                                struct zfcp_unit *unit,
3394                                struct scsi_cmnd * scsi_cmnd,
3395                                int use_timer, int req_flags)
3396 {
3397         struct zfcp_fsf_req *fsf_req = NULL;
3398         struct fcp_cmnd_iu *fcp_cmnd_iu;
3399         unsigned int sbtype;
3400         unsigned long lock_flags;
3401         int real_bytes = 0;
3402         int retval = 0;
3403         int mask;
3404
3405         /* setup new FSF request */
3406         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3407                                      adapter->pool.fsf_req_scsi,
3408                                      &lock_flags, &fsf_req);
3409         if (unlikely(retval < 0)) {
3410                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3411                                "for unit 0x%016Lx on port 0x%016Lx on "
3412                                "adapter %s\n",
3413                                unit->fcp_lun,
3414                                unit->port->wwpn,
3415                                zfcp_get_busid_by_adapter(adapter));
3416                 goto failed_req_create;
3417         }
3418
3419         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3420                         &unit->status))) {
3421                 retval = -EBUSY;
3422                 goto unit_blocked;
3423         }
3424
3425         zfcp_unit_get(unit);
3426         fsf_req->unit = unit;
3427
3428         /* associate FSF request with SCSI request (for look up on abort) */
3429         scsi_cmnd->host_scribble = (unsigned char *) fsf_req->req_id;
3430
3431         /* associate SCSI command with FSF request */
3432         fsf_req->data = (unsigned long) scsi_cmnd;
3433
3434         /* set handles of unit and its parent port in QTCB */
3435         fsf_req->qtcb->header.lun_handle = unit->handle;
3436         fsf_req->qtcb->header.port_handle = unit->port->handle;
3437
3438         /* FSF does not define the structure of the FCP_CMND IU */
3439         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3440             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3441
3442         /*
3443          * set depending on data direction:
3444          *      data direction bits in SBALE (SB Type)
3445          *      data direction bits in QTCB
3446          *      data direction bits in FCP_CMND IU
3447          */
3448         switch (scsi_cmnd->sc_data_direction) {
3449         case DMA_NONE:
3450                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3451                 /*
3452                  * FIXME(qdio):
3453                  * what is the correct type for commands
3454                  * without 'real' data buffers?
3455                  */
3456                 sbtype = SBAL_FLAGS0_TYPE_READ;
3457                 break;
3458         case DMA_FROM_DEVICE:
3459                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3460                 sbtype = SBAL_FLAGS0_TYPE_READ;
3461                 fcp_cmnd_iu->rddata = 1;
3462                 break;
3463         case DMA_TO_DEVICE:
3464                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3465                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3466                 fcp_cmnd_iu->wddata = 1;
3467                 break;
3468         case DMA_BIDIRECTIONAL:
3469         default:
3470                 /*
3471                  * dummy, catch this condition earlier
3472                  * in zfcp_scsi_queuecommand
3473                  */
3474                 goto failed_scsi_cmnd;
3475         }
3476
3477         /* set FC service class in QTCB (3 per default) */
3478         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3479
3480         /* set FCP_LUN in FCP_CMND IU in QTCB */
3481         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3482
3483         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3484
3485         /* set task attributes in FCP_CMND IU in QTCB */
3486         if (likely((scsi_cmnd->device->simple_tags) ||
3487                    (atomic_test_mask(mask, &unit->status))))
3488                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3489         else
3490                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3491
3492         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3493         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3494                 fcp_cmnd_iu->add_fcp_cdb_length
3495                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3496                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3497                                "additional FCP_CDB length is 0x%x "
3498                                "(shifted right 2 bits)\n",
3499                                scsi_cmnd->cmd_len,
3500                                fcp_cmnd_iu->add_fcp_cdb_length);
3501         }
3502         /*
3503          * copy SCSI CDB (including additional length, if any) to
3504          * FCP_CDB in FCP_CMND IU in QTCB
3505          */
3506         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3507
3508         /* FCP CMND IU length in QTCB */
3509         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3510                 sizeof (struct fcp_cmnd_iu) +
3511                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3512
3513         /* generate SBALEs from data buffer */
3514         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3515         if (unlikely(real_bytes < 0)) {
3516                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3517                         ZFCP_LOG_DEBUG(
3518                                 "Data did not fit into available buffer(s), "
3519                                "waiting for more...\n");
3520                         retval = -EIO;
3521                 } else {
3522                         ZFCP_LOG_NORMAL("error: No truncation implemented but "
3523                                         "required. Shutting down unit "
3524                                         "(adapter %s, port 0x%016Lx, "
3525                                         "unit 0x%016Lx)\n",
3526                                         zfcp_get_busid_by_unit(unit),
3527                                         unit->port->wwpn,
3528                                         unit->fcp_lun);
3529                         zfcp_erp_unit_shutdown(unit, 0, 131, fsf_req);
3530                         retval = -EINVAL;
3531                 }
3532                 goto no_fit;
3533         }
3534
3535         /* set length of FCP data length in FCP_CMND IU in QTCB */
3536         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3537
3538         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3539         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3540                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3541
3542         if (use_timer)
3543                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
3544
3545         retval = zfcp_fsf_req_send(fsf_req);
3546         if (unlikely(retval < 0)) {
3547                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3548                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3549                               zfcp_get_busid_by_adapter(adapter),
3550                               unit->port->wwpn,
3551                               unit->fcp_lun);
3552                 goto send_failed;
3553         }
3554
3555         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3556                        "port 0x%016Lx, unit 0x%016Lx)\n",
3557                        zfcp_get_busid_by_adapter(adapter),
3558                        unit->port->wwpn,
3559                        unit->fcp_lun);
3560         goto success;
3561
3562  send_failed:
3563  no_fit:
3564  failed_scsi_cmnd:
3565  unit_blocked:
3566         zfcp_unit_put(unit);
3567         zfcp_fsf_req_free(fsf_req);
3568         fsf_req = NULL;
3569         scsi_cmnd->host_scribble = NULL;
3570  success:
3571  failed_req_create:
3572         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3573         return retval;
3574 }
3575
3576 struct zfcp_fsf_req *
3577 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3578                                           struct zfcp_unit *unit,
3579                                           u8 tm_flags, int req_flags)
3580 {
3581         struct zfcp_fsf_req *fsf_req = NULL;
3582         int retval = 0;
3583         struct fcp_cmnd_iu *fcp_cmnd_iu;
3584         unsigned long lock_flags;
3585         volatile struct qdio_buffer_element *sbale;
3586
3587         /* setup new FSF request */
3588         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3589                                      adapter->pool.fsf_req_scsi,
3590                                      &lock_flags, &fsf_req);
3591         if (retval < 0) {
3592                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3593                               "management) request for adapter %s, port "
3594                               " 0x%016Lx, unit 0x%016Lx.\n",
3595                               zfcp_get_busid_by_adapter(adapter),
3596                               unit->port->wwpn, unit->fcp_lun);
3597                 goto out;
3598         }
3599
3600         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3601                         &unit->status)))
3602                 goto unit_blocked;
3603
3604         /*
3605          * Used to decide on proper handler in the return path,
3606          * could be either zfcp_fsf_send_fcp_command_task_handler or
3607          * zfcp_fsf_send_fcp_command_task_management_handler */
3608
3609         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3610
3611         /*
3612          * hold a pointer to the unit being target of this
3613          * task management request
3614          */
3615         fsf_req->data = (unsigned long) unit;
3616
3617         /* set FSF related fields in QTCB */
3618         fsf_req->qtcb->header.lun_handle = unit->handle;
3619         fsf_req->qtcb->header.port_handle = unit->port->handle;
3620         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3621         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3622         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3623                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3624
3625         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3626         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3627         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3628
3629         /* set FCP related fields in FCP_CMND IU in QTCB */
3630         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3631                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3632         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3633         fcp_cmnd_iu->task_management_flags = tm_flags;
3634
3635         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
3636         retval = zfcp_fsf_req_send(fsf_req);
3637         if (!retval)
3638                 goto out;
3639
3640  unit_blocked:
3641         zfcp_fsf_req_free(fsf_req);
3642         fsf_req = NULL;
3643
3644  out:
3645         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3646         return fsf_req;
3647 }
3648
3649 /*
3650  * function:    zfcp_fsf_send_fcp_command_handler
3651  *
3652  * purpose:     is called for finished Send FCP Command
3653  *
3654  * returns:
3655  */
3656 static int
3657 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3658 {
3659         int retval = -EINVAL;
3660         struct zfcp_unit *unit;
3661         struct fsf_qtcb_header *header;
3662         u16 subtable, rule, counter;
3663
3664         header = &fsf_req->qtcb->header;
3665
3666         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3667                 unit = (struct zfcp_unit *) fsf_req->data;
3668         else
3669                 unit = fsf_req->unit;
3670
3671         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3672                 /* go directly to calls of special handlers */
3673                 goto skip_fsfstatus;
3674         }
3675
3676         /* evaluate FSF status in QTCB */
3677         switch (header->fsf_status) {
3678
3679         case FSF_PORT_HANDLE_NOT_VALID:
3680                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3681                               "0x%016Lx on adapter %s invalid\n",
3682                               unit->port->handle,
3683                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3684                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3685                               (char *) &header->fsf_status_qual,
3686                               sizeof (union fsf_status_qual));
3687                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, fsf_req);
3688                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3689                 break;
3690
3691         case FSF_LUN_HANDLE_NOT_VALID:
3692                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3693                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3694                               "invalid. This may happen occasionally.\n",
3695                               unit->handle,
3696                               unit->fcp_lun,
3697                               unit->port->wwpn,
3698                               zfcp_get_busid_by_unit(unit));
3699                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3700                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3701                               (char *) &header->fsf_status_qual,
3702                               sizeof (union fsf_status_qual));
3703                 zfcp_erp_port_reopen(unit->port, 0, 113, fsf_req);
3704                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3705                 break;
3706
3707         case FSF_HANDLE_MISMATCH:
3708                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3709                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3710                                 "unit 0x%016Lx)\n",
3711                                 unit->port->handle,
3712                                 zfcp_get_busid_by_unit(unit),
3713                                 unit->port->wwpn,
3714                                 unit->fcp_lun);
3715                 ZFCP_LOG_NORMAL("status qualifier:\n");
3716                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3717                               (char *) &header->fsf_status_qual,
3718                               sizeof (union fsf_status_qual));
3719                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 114, fsf_req);
3720                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3721                 break;
3722
3723         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3724                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
3725                               "class %d.\n",
3726                               zfcp_get_busid_by_unit(unit),
3727                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
3728                 /* stop operation for this adapter */
3729                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 132, fsf_req);
3730                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3731                 break;
3732
3733         case FSF_FCPLUN_NOT_VALID:
3734                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3735                                 "adapter %s does not have correct unit "
3736                                 "handle 0x%x\n",
3737                                 unit->fcp_lun,
3738                                 unit->port->wwpn,
3739                                 zfcp_get_busid_by_unit(unit),
3740                                 unit->handle);
3741                 ZFCP_LOG_DEBUG("status qualifier:\n");
3742                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3743                               (char *) &header->fsf_status_qual,
3744                               sizeof (union fsf_status_qual));
3745                 zfcp_erp_port_reopen(unit->port, 0, 115, fsf_req);
3746                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3747                 break;
3748
3749         case FSF_ACCESS_DENIED:
3750                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3751                                 "unit 0x%016Lx on port 0x%016Lx on "
3752                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3753                                 zfcp_get_busid_by_unit(unit));
3754                 for (counter = 0; counter < 2; counter++) {
3755                         subtable = header->fsf_status_qual.halfword[counter * 2];
3756                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3757                         switch (subtable) {
3758                         case FSF_SQ_CFDC_SUBTABLE_OS:
3759                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3760                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3761                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3762                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3763                                         zfcp_act_subtable_type[subtable], rule);
3764                                 break;
3765                         }
3766                 }
3767                 zfcp_erp_unit_access_denied(unit, 61, fsf_req);
3768                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3769                 break;
3770
3771         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3772                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3773                               "0x%016Lx on port 0x%016Lx on adapter %s "
3774                               "(debug info %d)\n",
3775                               unit->fcp_lun,
3776                               unit->port->wwpn,
3777                               zfcp_get_busid_by_unit(unit),
3778                               fsf_req->qtcb->bottom.io.data_direction);
3779                 /* stop operation for this adapter */
3780                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, fsf_req);
3781                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3782                 break;
3783
3784         case FSF_CMND_LENGTH_NOT_VALID:
3785                 ZFCP_LOG_NORMAL
3786                     ("bug: An invalid control-data-block length field "
3787                      "was found in a command for unit 0x%016Lx on port "
3788                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3789                      unit->fcp_lun, unit->port->wwpn,
3790                      zfcp_get_busid_by_unit(unit),
3791                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3792                 /* stop operation for this adapter */
3793                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, fsf_req);
3794                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3795                 break;
3796
3797         case FSF_PORT_BOXED:
3798                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3799                                "needs to be reopened\n",
3800                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3801                 zfcp_erp_port_boxed(unit->port, 53, fsf_req);
3802                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3803                         ZFCP_STATUS_FSFREQ_RETRY;
3804                 break;
3805
3806         case FSF_LUN_BOXED:
3807                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3808                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3809                                 zfcp_get_busid_by_unit(unit),
3810                                 unit->port->wwpn, unit->fcp_lun);
3811                 zfcp_erp_unit_boxed(unit, 54, fsf_req);
3812                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3813                         | ZFCP_STATUS_FSFREQ_RETRY;
3814                 break;
3815
3816         case FSF_ADAPTER_STATUS_AVAILABLE:
3817                 switch (header->fsf_status_qual.word[0]) {
3818                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3819                         /* re-establish link to port */
3820                         zfcp_test_link(unit->port);
3821                         break;
3822                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3823                         /* FIXME(hw) need proper specs for proper action */
3824                         /* let scsi stack deal with retries and escalation */
3825                         break;
3826                 default:
3827                         ZFCP_LOG_NORMAL
3828                             ("Unknown status qualifier 0x%x arrived.\n",
3829                              header->fsf_status_qual.word[0]);
3830                         break;
3831                 }
3832                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3833                 break;
3834
3835         case FSF_GOOD:
3836                 break;
3837
3838         case FSF_FCP_RSP_AVAILABLE:
3839                 break;
3840         }
3841
3842  skip_fsfstatus:
3843         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3844                 retval =
3845                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3846         } else {
3847                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3848                 fsf_req->unit = NULL;
3849                 zfcp_unit_put(unit);
3850         }
3851         return retval;
3852 }
3853
3854 /*
3855  * function:    zfcp_fsf_send_fcp_command_task_handler
3856  *
3857  * purpose:     evaluates FCP_RSP IU
3858  *
3859  * returns:
3860  */
3861 static int
3862 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3863 {
3864         int retval = 0;
3865         struct scsi_cmnd *scpnt;
3866         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3867             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3868         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3869             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3870         u32 sns_len;
3871         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3872         unsigned long flags;
3873         struct zfcp_unit *unit = fsf_req->unit;
3874
3875         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3876         scpnt = (struct scsi_cmnd *) fsf_req->data;
3877         if (unlikely(!scpnt)) {
3878                 ZFCP_LOG_DEBUG
3879                     ("Command with fsf_req %p is not associated to "
3880                      "a scsi command anymore. Aborted?\n", fsf_req);
3881                 goto out;
3882         }
3883         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3884                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3885                  *        DID_SOFT_ERROR by retrying the request for devices
3886                  *        that allow retries.
3887                  */
3888                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3889                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3890                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3891                 goto skip_fsfstatus;
3892         }
3893
3894         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3895                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3896                 set_host_byte(&scpnt->result, DID_ERROR);
3897                 goto skip_fsfstatus;
3898         }
3899
3900         /* set message byte of result in SCSI command */
3901         scpnt->result |= COMMAND_COMPLETE << 8;
3902
3903         /*
3904          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
3905          * of result in SCSI command
3906          */
3907         scpnt->result |= fcp_rsp_iu->scsi_status;
3908         if (unlikely(fcp_rsp_iu->scsi_status)) {
3909                 /* DEBUG */
3910                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
3911                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3912                               scpnt->cmnd, scpnt->cmd_len);
3913                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
3914                                 fcp_rsp_iu->scsi_status);
3915                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3916                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
3917                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3918                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
3919                               fcp_rsp_iu->fcp_sns_len);
3920         }
3921
3922         /* check FCP_RSP_INFO */
3923         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
3924                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
3925                 switch (fcp_rsp_info[3]) {
3926                 case RSP_CODE_GOOD:
3927                         /* ok, continue */
3928                         ZFCP_LOG_TRACE("no failure or Task Management "
3929                                        "Function complete\n");
3930                         set_host_byte(&scpnt->result, DID_OK);
3931                         break;
3932                 case RSP_CODE_LENGTH_MISMATCH:
3933                         /* hardware bug */
3934                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3935                                         "that the fibrechannel protocol data "
3936                                         "length differs from the burst length. "
3937                                         "The problem occured on unit 0x%016Lx "
3938                                         "on port 0x%016Lx on adapter %s",
3939                                         unit->fcp_lun,
3940                                         unit->port->wwpn,
3941                                         zfcp_get_busid_by_unit(unit));
3942                         /* dump SCSI CDB as prepared by zfcp */
3943                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3944                                       (char *) &fsf_req->qtcb->
3945                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3946                         set_host_byte(&scpnt->result, DID_ERROR);
3947                         goto skip_fsfstatus;
3948                 case RSP_CODE_FIELD_INVALID:
3949                         /* driver or hardware bug */
3950                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3951                                         "that the fibrechannel protocol data "
3952                                         "fields were incorrectly set up. "
3953                                         "The problem occured on the unit "
3954                                         "0x%016Lx on port 0x%016Lx on "
3955                                         "adapter %s",
3956                                         unit->fcp_lun,
3957                                         unit->port->wwpn,
3958                                         zfcp_get_busid_by_unit(unit));
3959                         /* dump SCSI CDB as prepared by zfcp */
3960                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3961                                       (char *) &fsf_req->qtcb->
3962                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3963                         set_host_byte(&scpnt->result, DID_ERROR);
3964                         goto skip_fsfstatus;
3965                 case RSP_CODE_RO_MISMATCH:
3966                         /* hardware bug */
3967                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
3968                                         "that conflicting  values for the "
3969                                         "fibrechannel payload offset from the "
3970                                         "header were found. "
3971                                         "The problem occured on unit 0x%016Lx "
3972                                         "on port 0x%016Lx on adapter %s.\n",
3973                                         unit->fcp_lun,
3974                                         unit->port->wwpn,
3975                                         zfcp_get_busid_by_unit(unit));
3976                         /* dump SCSI CDB as prepared by zfcp */
3977                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3978                                       (char *) &fsf_req->qtcb->
3979                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3980                         set_host_byte(&scpnt->result, DID_ERROR);
3981                         goto skip_fsfstatus;
3982                 default:
3983                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
3984                                         "code was detected for a command. "
3985                                         "The problem occured on the unit "
3986                                         "0x%016Lx on port 0x%016Lx on "
3987                                         "adapter %s (debug info 0x%x)\n",
3988                                         unit->fcp_lun,
3989                                         unit->port->wwpn,
3990                                         zfcp_get_busid_by_unit(unit),
3991                                         fcp_rsp_info[3]);
3992                         /* dump SCSI CDB as prepared by zfcp */
3993                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3994                                       (char *) &fsf_req->qtcb->
3995                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3996                         set_host_byte(&scpnt->result, DID_ERROR);
3997                         goto skip_fsfstatus;
3998                 }
3999         }
4000
4001         /* check for sense data */
4002         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4003                 sns_len = FSF_FCP_RSP_SIZE -
4004                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4005                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4006                                sns_len);
4007                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4008                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4009                                SCSI_SENSE_BUFFERSIZE);
4010                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4011                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4012                                scpnt->result);
4013                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4014                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4015
4016                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4017                                fcp_rsp_iu->fcp_sns_len);
4018                 memcpy(scpnt->sense_buffer,
4019                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4020                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4021                               (void *)scpnt->sense_buffer, sns_len);
4022         }
4023
4024         /* check for overrun */
4025         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4026                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4027                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4028                               "The response data length is "
4029                               "%d, the original length was %d.\n",
4030                               unit->fcp_lun,
4031                               unit->port->wwpn,
4032                               zfcp_get_busid_by_unit(unit),
4033                               fcp_rsp_iu->fcp_resid,
4034                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4035         }
4036
4037         /* check for underrun */
4038         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4039                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4040                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4041                               "The response data length is "
4042                               "%d, the original length was %d.\n",
4043                               unit->fcp_lun,
4044                               unit->port->wwpn,
4045                               zfcp_get_busid_by_unit(unit),
4046                               fcp_rsp_iu->fcp_resid,
4047                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4048
4049                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
4050                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
4051                     scpnt->underflow)
4052                         set_host_byte(&scpnt->result, DID_ERROR);
4053         }
4054
4055  skip_fsfstatus:
4056         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4057
4058         if (scpnt->result != 0)
4059                 zfcp_scsi_dbf_event_result("erro", 3, fsf_req->adapter, scpnt, fsf_req);
4060         else if (scpnt->retries > 0)
4061                 zfcp_scsi_dbf_event_result("retr", 4, fsf_req->adapter, scpnt, fsf_req);
4062         else
4063                 zfcp_scsi_dbf_event_result("norm", 6, fsf_req->adapter, scpnt, fsf_req);
4064
4065         /* cleanup pointer (need this especially for abort) */
4066         scpnt->host_scribble = NULL;
4067
4068         /* always call back */
4069         (scpnt->scsi_done) (scpnt);
4070
4071         /*
4072          * We must hold this lock until scsi_done has been called.
4073          * Otherwise we may call scsi_done after abort regarding this
4074          * command has completed.
4075          * Note: scsi_done must not block!
4076          */
4077  out:
4078         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4079         return retval;
4080 }
4081
4082 /*
4083  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4084  *
4085  * purpose:     evaluates FCP_RSP IU
4086  *
4087  * returns:
4088  */
4089 static int
4090 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4091 {
4092         int retval = 0;
4093         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4094             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4095         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4096         struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
4097
4098         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4099                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4100                 goto skip_fsfstatus;
4101         }
4102
4103         /* check FCP_RSP_INFO */
4104         switch (fcp_rsp_info[3]) {
4105         case RSP_CODE_GOOD:
4106                 /* ok, continue */
4107                 ZFCP_LOG_DEBUG("no failure or Task Management "
4108                                "Function complete\n");
4109                 break;
4110         case RSP_CODE_TASKMAN_UNSUPP:
4111                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4112                                 "is not supported on the target device "
4113                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4114                                 unit->fcp_lun,
4115                                 unit->port->wwpn,
4116                                 zfcp_get_busid_by_unit(unit));
4117                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4118                 break;
4119         case RSP_CODE_TASKMAN_FAILED:
4120                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4121                                 "failed to complete successfully. "
4122                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4123                                 unit->fcp_lun,
4124                                 unit->port->wwpn,
4125                                 zfcp_get_busid_by_unit(unit));
4126                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4127                 break;
4128         default:
4129                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4130                                 "code was detected for a command. "
4131                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4132                                 "(debug info 0x%x)\n",
4133                                 unit->fcp_lun,
4134                                 unit->port->wwpn,
4135                                 zfcp_get_busid_by_unit(unit),
4136                                 fcp_rsp_info[3]);
4137                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4138         }
4139
4140       skip_fsfstatus:
4141         return retval;
4142 }
4143
4144
4145 /*
4146  * function:    zfcp_fsf_control_file
4147  *
4148  * purpose:     Initiator of the control file upload/download FSF requests
4149  *
4150  * returns:     0           - FSF request is successfuly created and queued
4151  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4152  *              -EINVAL     - Invalid direction specified
4153  *              -ENOMEM     - Insufficient memory
4154  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4155  */
4156 int
4157 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4158                       struct zfcp_fsf_req **fsf_req_ptr,
4159                       u32 fsf_command,
4160                       u32 option,
4161                       struct zfcp_sg_list *sg_list)
4162 {
4163         struct zfcp_fsf_req *fsf_req;
4164         struct fsf_qtcb_bottom_support *bottom;
4165         volatile struct qdio_buffer_element *sbale;
4166         unsigned long lock_flags;
4167         int req_flags = 0;
4168         int direction;
4169         int retval = 0;
4170
4171         if (!(adapter->adapter_features & FSF_FEATURE_CFDC)) {
4172                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4173                               zfcp_get_busid_by_adapter(adapter));
4174                 retval = -EOPNOTSUPP;
4175                 goto out;
4176         }
4177
4178         switch (fsf_command) {
4179
4180         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4181                 direction = SBAL_FLAGS0_TYPE_WRITE;
4182                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4183                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4184                         req_flags = ZFCP_WAIT_FOR_SBAL;
4185                 break;
4186
4187         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4188                 direction = SBAL_FLAGS0_TYPE_READ;
4189                 break;
4190
4191         default:
4192                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4193                 retval = -EINVAL;
4194                 goto out;
4195         }
4196
4197         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4198                                      NULL, &lock_flags, &fsf_req);
4199         if (retval < 0) {
4200                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4201                               "adapter %s\n",
4202                         zfcp_get_busid_by_adapter(adapter));
4203                 retval = -EPERM;
4204                 goto unlock_queue_lock;
4205         }
4206
4207         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4208         sbale[0].flags |= direction;
4209
4210         bottom = &fsf_req->qtcb->bottom.support;
4211         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4212         bottom->option = option;
4213
4214         if (sg_list->count > 0) {
4215                 int bytes;
4216
4217                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4218                                                 sg_list->sg, sg_list->count,
4219                                                 ZFCP_MAX_SBALS_PER_REQ);
4220                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4221                         ZFCP_LOG_INFO(
4222                                 "error: Could not create sufficient number of "
4223                                 "SBALS for an FSF request to the adapter %s\n",
4224                                 zfcp_get_busid_by_adapter(adapter));
4225                         retval = -ENOMEM;
4226                         goto free_fsf_req;
4227                 }
4228         } else
4229                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4230
4231         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
4232         retval = zfcp_fsf_req_send(fsf_req);
4233         if (retval < 0) {
4234                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4235                               "(adapter %s)\n",
4236                               zfcp_get_busid_by_adapter(adapter));
4237                 retval = -EPERM;
4238                 goto free_fsf_req;
4239         }
4240         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4241
4242         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4243                         "adapter %s\n",
4244                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4245                         "download" : "upload",
4246                         zfcp_get_busid_by_adapter(adapter));
4247
4248         wait_event(fsf_req->completion_wq,
4249                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4250
4251         *fsf_req_ptr = fsf_req;
4252         goto out;
4253
4254  free_fsf_req:
4255         zfcp_fsf_req_free(fsf_req);
4256  unlock_queue_lock:
4257         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4258  out:
4259         return retval;
4260 }
4261
4262
4263 /*
4264  * function:    zfcp_fsf_control_file_handler
4265  *
4266  * purpose:     Handler of the control file upload/download FSF requests
4267  *
4268  * returns:     0       - FSF request successfuly processed
4269  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4270  *              -EACCES - There is no permission to execute an operation
4271  *              -EPERM  - The control file is not in a right format
4272  *              -EIO    - There is a problem with the FCP adapter
4273  *              -EINVAL - Invalid operation
4274  *              -EFAULT - User space memory I/O operation fault
4275  */
4276 static int
4277 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4278 {
4279         struct zfcp_adapter *adapter = fsf_req->adapter;
4280         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4281         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4282         int retval = 0;
4283
4284         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4285                 retval = -EINVAL;
4286                 goto skip_fsfstatus;
4287         }
4288
4289         switch (header->fsf_status) {
4290
4291         case FSF_GOOD:
4292                 ZFCP_LOG_NORMAL(
4293                         "The FSF request has been successfully completed "
4294                         "on the adapter %s\n",
4295                         zfcp_get_busid_by_adapter(adapter));
4296                 break;
4297
4298         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4299                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4300                         switch (header->fsf_status_qual.word[0]) {
4301
4302                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4303                                 ZFCP_LOG_NORMAL(
4304                                         "CFDC on the adapter %s has being "
4305                                         "hardened on primary and secondary SE\n",
4306                                         zfcp_get_busid_by_adapter(adapter));
4307                                 break;
4308
4309                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4310                                 ZFCP_LOG_NORMAL(
4311                                         "CFDC of the adapter %s could not "
4312                                         "be saved on the SE\n",
4313                                         zfcp_get_busid_by_adapter(adapter));
4314                                 break;
4315
4316                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4317                                 ZFCP_LOG_NORMAL(
4318                                         "CFDC of the adapter %s could not "
4319                                         "be copied to the secondary SE\n",
4320                                         zfcp_get_busid_by_adapter(adapter));
4321                                 break;
4322
4323                         default:
4324                                 ZFCP_LOG_NORMAL(
4325                                         "CFDC could not be hardened "
4326                                         "on the adapter %s\n",
4327                                         zfcp_get_busid_by_adapter(adapter));
4328                         }
4329                 }
4330                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4331                 retval = -EAGAIN;
4332                 break;
4333
4334         case FSF_AUTHORIZATION_FAILURE:
4335                 ZFCP_LOG_NORMAL(
4336                         "Adapter %s does not accept privileged commands\n",
4337                         zfcp_get_busid_by_adapter(adapter));
4338                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4339                 retval = -EACCES;
4340                 break;
4341
4342         case FSF_CFDC_ERROR_DETECTED:
4343                 ZFCP_LOG_NORMAL(
4344                         "Error at position %d in the CFDC, "
4345                         "CFDC is discarded by the adapter %s\n",
4346                         header->fsf_status_qual.word[0],
4347                         zfcp_get_busid_by_adapter(adapter));
4348                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4349                 retval = -EPERM;
4350                 break;
4351
4352         case FSF_CONTROL_FILE_UPDATE_ERROR:
4353                 ZFCP_LOG_NORMAL(
4354                         "Adapter %s cannot harden the control file, "
4355                         "file is discarded\n",
4356                         zfcp_get_busid_by_adapter(adapter));
4357                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4358                 retval = -EIO;
4359                 break;
4360
4361         case FSF_CONTROL_FILE_TOO_LARGE:
4362                 ZFCP_LOG_NORMAL(
4363                         "Control file is too large, file is discarded "
4364                         "by the adapter %s\n",
4365                         zfcp_get_busid_by_adapter(adapter));
4366                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4367                 retval = -EIO;
4368                 break;
4369
4370         case FSF_ACCESS_CONFLICT_DETECTED:
4371                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4372                         ZFCP_LOG_NORMAL(
4373                                 "CFDC has been discarded by the adapter %s, "
4374                                 "because activation would impact "
4375                                 "%d active connection(s)\n",
4376                                 zfcp_get_busid_by_adapter(adapter),
4377                                 header->fsf_status_qual.word[0]);
4378                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4379                 retval = -EIO;
4380                 break;
4381
4382         case FSF_CONFLICTS_OVERRULED:
4383                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4384                         ZFCP_LOG_NORMAL(
4385                                 "CFDC has been activated on the adapter %s, "
4386                                 "but activation has impacted "
4387                                 "%d active connection(s)\n",
4388                                 zfcp_get_busid_by_adapter(adapter),
4389                                 header->fsf_status_qual.word[0]);
4390                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4391                 retval = -EIO;
4392                 break;
4393
4394         case FSF_UNKNOWN_OP_SUBTYPE:
4395                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4396                                 "op_subtype=0x%x)\n",
4397                                 zfcp_get_busid_by_adapter(adapter),
4398                                 bottom->operation_subtype);
4399                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4400                 retval = -EINVAL;
4401                 break;
4402
4403         case FSF_INVALID_COMMAND_OPTION:
4404                 ZFCP_LOG_NORMAL(
4405                         "Invalid option 0x%x has been specified "
4406                         "in QTCB bottom sent to the adapter %s\n",
4407                         bottom->option,
4408                         zfcp_get_busid_by_adapter(adapter));
4409                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4410                 retval = -EINVAL;
4411                 break;
4412
4413         default:
4414                 ZFCP_LOG_NORMAL(
4415                         "bug: An unknown/unexpected FSF status 0x%08x "
4416                         "was presented on the adapter %s\n",
4417                         header->fsf_status,
4418                         zfcp_get_busid_by_adapter(adapter));
4419                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4420                 retval = -EINVAL;
4421                 break;
4422         }
4423
4424 skip_fsfstatus:
4425         return retval;
4426 }
4427
4428 static inline int
4429 zfcp_fsf_req_sbal_check(unsigned long *flags,
4430                         struct zfcp_qdio_queue *queue, int needed)
4431 {
4432         write_lock_irqsave(&queue->queue_lock, *flags);
4433         if (likely(atomic_read(&queue->free_count) >= needed))
4434                 return 1;
4435         write_unlock_irqrestore(&queue->queue_lock, *flags);
4436         return 0;
4437 }
4438
4439 /*
4440  * set qtcb pointer in fsf_req and initialize QTCB
4441  */
4442 static void
4443 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
4444 {
4445         if (likely(fsf_req->qtcb != NULL)) {
4446                 fsf_req->qtcb->prefix.req_seq_no =
4447                         fsf_req->adapter->fsf_req_seq_no;
4448                 fsf_req->qtcb->prefix.req_id = fsf_req->req_id;
4449                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4450                 fsf_req->qtcb->prefix.qtcb_type =
4451                         fsf_qtcb_type[fsf_req->fsf_command];
4452                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4453                 fsf_req->qtcb->header.req_handle = fsf_req->req_id;
4454                 fsf_req->qtcb->header.fsf_command = fsf_req->fsf_command;
4455         }
4456 }
4457
4458 /**
4459  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4460  * @adapter: adapter for which request queue is examined
4461  * @req_flags: flags indicating whether to wait for needed SBAL or not
4462  * @lock_flags: lock_flags if queue_lock is taken
4463  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4464  * Locks: lock adapter->request_queue->queue_lock on success
4465  */
4466 static int
4467 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4468                       unsigned long *lock_flags)
4469 {
4470         long ret;
4471         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4472
4473         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4474                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4475                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4476                                                        ZFCP_SBAL_TIMEOUT);
4477                 if (ret < 0)
4478                         return ret;
4479                 if (!ret)
4480                         return -EIO;
4481         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4482                 return -EIO;
4483
4484         return 0;
4485 }
4486
4487 /*
4488  * function:    zfcp_fsf_req_create
4489  *
4490  * purpose:     create an FSF request at the specified adapter and
4491  *              setup common fields
4492  *
4493  * returns:     -ENOMEM if there was insufficient memory for a request
4494  *              -EIO if no qdio buffers could be allocate to the request
4495  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4496  *              0 in success
4497  *
4498  * note:        The created request is returned by reference.
4499  *
4500  * locks:       lock of concerned request queue must not be held,
4501  *              but is held on completion (write, irqsave)
4502  */
4503 int
4504 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4505                     mempool_t *pool, unsigned long *lock_flags,
4506                     struct zfcp_fsf_req **fsf_req_p)
4507 {
4508         volatile struct qdio_buffer_element *sbale;
4509         struct zfcp_fsf_req *fsf_req = NULL;
4510         int ret = 0;
4511         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4512
4513         /* allocate new FSF request */
4514         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4515         if (unlikely(NULL == fsf_req)) {
4516                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into "
4517                                "the outbound (send) queue.\n");
4518                 ret = -ENOMEM;
4519                 goto failed_fsf_req;
4520         }
4521
4522         fsf_req->adapter = adapter;
4523         fsf_req->fsf_command = fsf_cmd;
4524         INIT_LIST_HEAD(&fsf_req->list);
4525         init_timer(&fsf_req->timer);
4526
4527         /* initialize waitqueue which may be used to wait on
4528            this request completion */
4529         init_waitqueue_head(&fsf_req->completion_wq);
4530
4531         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4532         if (ret < 0)
4533                 goto failed_sbals;
4534
4535         /* this is serialized (we are holding req_queue-lock of adapter) */
4536         if (adapter->req_no == 0)
4537                 adapter->req_no++;
4538         fsf_req->req_id = adapter->req_no++;
4539
4540         zfcp_fsf_req_qtcb_init(fsf_req);
4541
4542         /*
4543          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4544          * if it is not set (see also *_open_qdio and *_close_qdio).
4545          */
4546
4547         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4548                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4549                 ret = -EIO;
4550                 goto failed_sbals;
4551         }
4552
4553         if (fsf_req->qtcb) {
4554                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4555                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4556         }
4557         fsf_req->sbal_number = 1;
4558         fsf_req->sbal_first = req_queue->free_index;
4559         fsf_req->sbal_curr = req_queue->free_index;
4560         fsf_req->sbale_curr = 1;
4561
4562         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4563                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4564         }
4565
4566         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4567
4568         /* setup common SBALE fields */
4569         sbale[0].addr = (void *) fsf_req->req_id;
4570         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4571         if (likely(fsf_req->qtcb != NULL)) {
4572                 sbale[1].addr = (void *) fsf_req->qtcb;
4573                 sbale[1].length = sizeof(struct fsf_qtcb);
4574         }
4575
4576         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4577                        fsf_req->sbal_number, fsf_req->sbal_first);
4578
4579         goto success;
4580
4581  failed_sbals:
4582 /* dequeue new FSF request previously enqueued */
4583         zfcp_fsf_req_free(fsf_req);
4584         fsf_req = NULL;
4585
4586  failed_fsf_req:
4587         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4588  success:
4589         *fsf_req_p = fsf_req;
4590         return ret;
4591 }
4592
4593 /*
4594  * function:    zfcp_fsf_req_send
4595  *
4596  * purpose:     start transfer of FSF request via QDIO
4597  *
4598  * returns:     0 - request transfer succesfully started
4599  *              !0 - start of request transfer failed
4600  */
4601 static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
4602 {
4603         struct zfcp_adapter *adapter;
4604         struct zfcp_qdio_queue *req_queue;
4605         volatile struct qdio_buffer_element *sbale;
4606         int inc_seq_no;
4607         int new_distance_from_int;
4608         int retval = 0;
4609
4610         adapter = fsf_req->adapter;
4611         req_queue = &adapter->request_queue,
4612
4613
4614         /* FIXME(debug): remove it later */
4615         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4616         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4617         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4618         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4619                       sbale[1].length);
4620
4621         /* put allocated FSF request into hash table */
4622         spin_lock(&adapter->req_list_lock);
4623         zfcp_reqlist_add(adapter, fsf_req);
4624         spin_unlock(&adapter->req_list_lock);
4625
4626         inc_seq_no = (fsf_req->qtcb != NULL);
4627
4628         ZFCP_LOG_TRACE("request queue of adapter %s: "
4629                        "next free SBAL is %i, %i free SBALs\n",
4630                        zfcp_get_busid_by_adapter(adapter),
4631                        req_queue->free_index,
4632                        atomic_read(&req_queue->free_count));
4633
4634         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4635                        "index_in_queue=%i, count=%i, buffers=%p\n",
4636                        zfcp_get_busid_by_adapter(adapter),
4637                        QDIO_FLAG_SYNC_OUTPUT,
4638                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4639                        &req_queue->buffer[fsf_req->sbal_first]);
4640
4641         /*
4642          * adjust the number of free SBALs in request queue as well as
4643          * position of first one
4644          */
4645         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4646         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4647         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4648         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4649         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4650
4651         fsf_req->issued = get_clock();
4652
4653         retval = do_QDIO(adapter->ccw_device,
4654                          QDIO_FLAG_SYNC_OUTPUT,
4655                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4656
4657         if (unlikely(retval)) {
4658                 /* Queues are down..... */
4659                 retval = -EIO;
4660                 del_timer(&fsf_req->timer);
4661                 spin_lock(&adapter->req_list_lock);
4662                 zfcp_reqlist_remove(adapter, fsf_req);
4663                 spin_unlock(&adapter->req_list_lock);
4664                 /* undo changes in request queue made for this request */
4665                 zfcp_qdio_zero_sbals(req_queue->buffer,
4666                                      fsf_req->sbal_first, fsf_req->sbal_number);
4667                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4668                 req_queue->free_index -= fsf_req->sbal_number;
4669                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4670                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4671                 zfcp_erp_adapter_reopen(adapter, 0, 116, fsf_req);
4672         } else {
4673                 req_queue->distance_from_int = new_distance_from_int;
4674                 /*
4675                  * increase FSF sequence counter -
4676                  * this must only be done for request successfully enqueued to
4677                  * QDIO this rejected requests may be cleaned up by calling
4678                  * routines  resulting in missing sequence counter values
4679                  * otherwise,
4680                  */
4681
4682                 /* Don't increase for unsolicited status */
4683                 if (inc_seq_no)
4684                         adapter->fsf_req_seq_no++;
4685
4686                 /* count FSF requests pending */
4687                 atomic_inc(&adapter->reqs_active);
4688         }
4689         return retval;
4690 }
4691
4692 #undef ZFCP_LOG_AREA