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
1033         atomic_inc(&adapter->stat_miss);
1034         schedule_work(&adapter->stat_work);
1035  out:
1036         return retval;
1037 }
1038
1039 /*
1040  * function:    zfcp_fsf_abort_fcp_command
1041  *
1042  * purpose:     tells FSF to abort a running SCSI command
1043  *
1044  * returns:     address of initiated FSF request
1045  *              NULL - request could not be initiated
1046  *
1047  * FIXME(design): should be watched by a timeout !!!
1048  * FIXME(design) shouldn't this be modified to return an int
1049  *               also...don't know how though
1050  */
1051 struct zfcp_fsf_req *
1052 zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
1053                            struct zfcp_adapter *adapter,
1054                            struct zfcp_unit *unit, int req_flags)
1055 {
1056         volatile struct qdio_buffer_element *sbale;
1057         struct zfcp_fsf_req *fsf_req = NULL;
1058         unsigned long lock_flags;
1059         int retval = 0;
1060
1061         /* setup new FSF request */
1062         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
1063                                      req_flags, adapter->pool.fsf_req_abort,
1064                                      &lock_flags, &fsf_req);
1065         if (retval < 0) {
1066                 ZFCP_LOG_INFO("error: Failed to create an abort command "
1067                               "request for lun 0x%016Lx on port 0x%016Lx "
1068                               "on adapter %s.\n",
1069                               unit->fcp_lun,
1070                               unit->port->wwpn,
1071                               zfcp_get_busid_by_adapter(adapter));
1072                 goto out;
1073         }
1074
1075         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1076                         &unit->status)))
1077                 goto unit_blocked;
1078
1079         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1080         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1081         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1082
1083         fsf_req->data = (unsigned long) unit;
1084
1085         /* set handles of unit and its parent port in QTCB */
1086         fsf_req->qtcb->header.lun_handle = unit->handle;
1087         fsf_req->qtcb->header.port_handle = unit->port->handle;
1088
1089         /* set handle of request which should be aborted */
1090         fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1091
1092         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
1093         retval = zfcp_fsf_req_send(fsf_req);
1094         if (!retval)
1095                 goto out;
1096
1097  unit_blocked:
1098                 zfcp_fsf_req_free(fsf_req);
1099                 fsf_req = NULL;
1100
1101  out:
1102         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
1103         return fsf_req;
1104 }
1105
1106 /*
1107  * function:    zfcp_fsf_abort_fcp_command_handler
1108  *
1109  * purpose:     is called for finished Abort FCP Command request
1110  *
1111  * returns:
1112  */
1113 static int
1114 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
1115 {
1116         int retval = -EINVAL;
1117         struct zfcp_unit *unit;
1118         union fsf_status_qual *fsf_stat_qual =
1119                 &new_fsf_req->qtcb->header.fsf_status_qual;
1120
1121         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1122                 /* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
1123                 goto skip_fsfstatus;
1124         }
1125
1126         unit = (struct zfcp_unit *) new_fsf_req->data;
1127
1128         /* evaluate FSF status in QTCB */
1129         switch (new_fsf_req->qtcb->header.fsf_status) {
1130
1131         case FSF_PORT_HANDLE_NOT_VALID:
1132                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1133                         /*
1134                          * In this case a command that was sent prior to a port
1135                          * reopen was aborted (handles are different). This is
1136                          * fine.
1137                          */
1138                 } else {
1139                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1140                                       "port 0x%016Lx on adapter %s invalid. "
1141                                       "This may happen occasionally.\n",
1142                                       unit->port->handle,
1143                                       unit->port->wwpn,
1144                                       zfcp_get_busid_by_unit(unit));
1145                         ZFCP_LOG_INFO("status qualifier:\n");
1146                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1147                                       (char *) &new_fsf_req->qtcb->header.
1148                                       fsf_status_qual,
1149                                       sizeof (union fsf_status_qual));
1150                         /* Let's hope this sorts out the mess */
1151                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
1152                                                 new_fsf_req);
1153                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1154                 }
1155                 break;
1156
1157         case FSF_LUN_HANDLE_NOT_VALID:
1158                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1159                         /*
1160                          * In this case a command that was sent prior to a unit
1161                          * reopen was aborted (handles are different).
1162                          * This is fine.
1163                          */
1164                 } else {
1165                         ZFCP_LOG_INFO
1166                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1167                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1168                              "invalid. This may happen in rare cases. "
1169                              "Trying to re-establish link.\n",
1170                              unit->handle,
1171                              unit->fcp_lun,
1172                              unit->port->wwpn,
1173                              zfcp_get_busid_by_unit(unit));
1174                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1175                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1176                                       (char *) &new_fsf_req->qtcb->header.
1177                                       fsf_status_qual,
1178                                       sizeof (union fsf_status_qual));
1179                         /* Let's hope this sorts out the mess */
1180                         zfcp_erp_port_reopen(unit->port, 0, 105, new_fsf_req);
1181                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1182                 }
1183                 break;
1184
1185         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1186                 retval = 0;
1187                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1188                 break;
1189
1190         case FSF_PORT_BOXED:
1191                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1192                               "be reopened\n", unit->port->wwpn,
1193                               zfcp_get_busid_by_unit(unit));
1194                 zfcp_erp_port_boxed(unit->port, 47, new_fsf_req);
1195                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1196                     | ZFCP_STATUS_FSFREQ_RETRY;
1197                 break;
1198
1199         case FSF_LUN_BOXED:
1200                 ZFCP_LOG_INFO(
1201                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1202                         "to be reopened\n",
1203                         unit->fcp_lun, unit->port->wwpn,
1204                         zfcp_get_busid_by_unit(unit));
1205                 zfcp_erp_unit_boxed(unit, 48, new_fsf_req);
1206                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1207                         | ZFCP_STATUS_FSFREQ_RETRY;
1208                 break;
1209
1210         case FSF_ADAPTER_STATUS_AVAILABLE:
1211                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1212                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1213                         zfcp_test_link(unit->port);
1214                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1215                         break;
1216                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1217                         /* SCSI stack will escalate */
1218                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1219                         break;
1220                 default:
1221                         ZFCP_LOG_NORMAL
1222                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1223                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1224                         break;
1225                 }
1226                 break;
1227
1228         case FSF_GOOD:
1229                 retval = 0;
1230                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1231                 break;
1232
1233         default:
1234                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1235                                 "(debug info 0x%x)\n",
1236                                 new_fsf_req->qtcb->header.fsf_status);
1237                 break;
1238         }
1239  skip_fsfstatus:
1240         return retval;
1241 }
1242
1243 /**
1244  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1245  *      one SBALE
1246  * Two scatter-gather lists are passed, one for the reqeust and one for the
1247  * response.
1248  */
1249 static inline int
1250 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1251                   struct scatterlist *resp, int resp_count)
1252 {
1253         return ((req_count == 1) &&
1254                 (resp_count == 1) &&
1255                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1256                   PAGE_MASK) ==
1257                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1258                                    req[0].length - 1) & PAGE_MASK)) &&
1259                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1260                   PAGE_MASK) ==
1261                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1262                                    resp[0].length - 1) & PAGE_MASK)));
1263 }
1264
1265 /**
1266  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1267  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1268  *      the request
1269  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1270  *      a struct zfcp_fsf_req
1271  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1272  *      is sent within error recovery
1273  */
1274 int
1275 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1276                  struct zfcp_erp_action *erp_action)
1277 {
1278         volatile struct qdio_buffer_element *sbale;
1279         struct zfcp_port *port;
1280         struct zfcp_adapter *adapter;
1281         struct zfcp_fsf_req *fsf_req;
1282         unsigned long lock_flags;
1283         int bytes;
1284         int ret = 0;
1285
1286         port = ct->port;
1287         adapter = port->adapter;
1288
1289         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1290                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1291                                   pool, &lock_flags, &fsf_req);
1292         if (ret < 0) {
1293                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1294                               "adapter: %s\n",
1295                               zfcp_get_busid_by_adapter(adapter));
1296                 goto failed_req;
1297         }
1298
1299         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1300         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1301                               ct->resp, ct->resp_count)){
1302                 /* both request buffer and response buffer
1303                    fit into one sbale each */
1304                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1305                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1306                 sbale[2].length = ct->req[0].length;
1307                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1308                 sbale[3].length = ct->resp[0].length;
1309                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1310         } else if (adapter->adapter_features &
1311                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1312                 /* try to use chained SBALs */
1313                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1314                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1315                                                 ct->req, ct->req_count,
1316                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1317                 if (bytes <= 0) {
1318                         ZFCP_LOG_INFO("error: creation of CT request failed "
1319                                       "on adapter %s\n",
1320                                       zfcp_get_busid_by_adapter(adapter));
1321                         if (bytes == 0)
1322                                 ret = -ENOMEM;
1323                         else
1324                                 ret = bytes;
1325
1326                         goto failed_send;
1327                 }
1328                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1329                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1330                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1331                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1332                                                 ct->resp, ct->resp_count,
1333                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1334                 if (bytes <= 0) {
1335                         ZFCP_LOG_INFO("error: creation of CT request failed "
1336                                       "on adapter %s\n",
1337                                       zfcp_get_busid_by_adapter(adapter));
1338                         if (bytes == 0)
1339                                 ret = -ENOMEM;
1340                         else
1341                                 ret = bytes;
1342
1343                         goto failed_send;
1344                 }
1345                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1346         } else {
1347                 /* reject send generic request */
1348                 ZFCP_LOG_INFO(
1349                         "error: microcode does not support chained SBALs,"
1350                         "CT request too big (adapter %s)\n",
1351                         zfcp_get_busid_by_adapter(adapter));
1352                 ret = -EOPNOTSUPP;
1353                 goto failed_send;
1354         }
1355
1356         /* settings in QTCB */
1357         fsf_req->qtcb->header.port_handle = port->handle;
1358         fsf_req->qtcb->bottom.support.service_class =
1359                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1360         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1361         fsf_req->data = (unsigned long) ct;
1362
1363         zfcp_san_dbf_event_ct_request(fsf_req);
1364
1365         if (erp_action) {
1366                 erp_action->fsf_req = fsf_req;
1367                 fsf_req->erp_action = erp_action;
1368                 zfcp_erp_start_timer(fsf_req);
1369         } else
1370                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1371
1372         ret = zfcp_fsf_req_send(fsf_req);
1373         if (ret) {
1374                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1375                                "(adapter %s, port 0x%016Lx)\n",
1376                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1377                 goto failed_send;
1378         }
1379
1380         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1381                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1382         goto out;
1383
1384  failed_send:
1385         zfcp_fsf_req_free(fsf_req);
1386         if (erp_action != NULL) {
1387                 erp_action->fsf_req = NULL;
1388         }
1389  failed_req:
1390  out:
1391         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1392                                 lock_flags);
1393         return ret;
1394 }
1395
1396 /**
1397  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1398  * @fsf_req: pointer to struct zfcp_fsf_req
1399  *
1400  * Data specific for the Generic Service request is passed using
1401  * fsf_req->data. There we find the pointer to struct zfcp_send_ct.
1402  * Usually a specific handler for the CT request is called which is
1403  * found in this structure.
1404  */
1405 static int
1406 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1407 {
1408         struct zfcp_port *port;
1409         struct zfcp_adapter *adapter;
1410         struct zfcp_send_ct *send_ct;
1411         struct fsf_qtcb_header *header;
1412         struct fsf_qtcb_bottom_support *bottom;
1413         int retval = -EINVAL;
1414         u16 subtable, rule, counter;
1415
1416         adapter = fsf_req->adapter;
1417         send_ct = (struct zfcp_send_ct *) fsf_req->data;
1418         port = send_ct->port;
1419         header = &fsf_req->qtcb->header;
1420         bottom = &fsf_req->qtcb->bottom.support;
1421
1422         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1423                 goto skip_fsfstatus;
1424
1425         /* evaluate FSF status in QTCB */
1426         switch (header->fsf_status) {
1427
1428         case FSF_GOOD:
1429                 zfcp_san_dbf_event_ct_response(fsf_req);
1430                 retval = 0;
1431                 break;
1432
1433         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1434                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1435                               "class %d.\n",
1436                               zfcp_get_busid_by_port(port),
1437                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1438                 /* stop operation for this adapter */
1439                 zfcp_erp_adapter_shutdown(adapter, 0, 123, fsf_req);
1440                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1441                 break;
1442
1443         case FSF_ADAPTER_STATUS_AVAILABLE:
1444                 switch (header->fsf_status_qual.word[0]){
1445                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1446                         /* reopening link to port */
1447                         zfcp_test_link(port);
1448                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1449                         break;
1450                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1451                         /* ERP strategy will escalate */
1452                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1453                         break;
1454                 default:
1455                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1456                                       "arrived.\n",
1457                                       header->fsf_status_qual.word[0]);
1458                         break;
1459                 }
1460                 break;
1461
1462         case FSF_ACCESS_DENIED:
1463                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1464                                 "command (adapter %s, port d_id=0x%06x)\n",
1465                                 zfcp_get_busid_by_port(port), port->d_id);
1466                 for (counter = 0; counter < 2; counter++) {
1467                         subtable = header->fsf_status_qual.halfword[counter * 2];
1468                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1469                         switch (subtable) {
1470                         case FSF_SQ_CFDC_SUBTABLE_OS:
1471                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1472                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1473                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1474                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1475                                         zfcp_act_subtable_type[subtable], rule);
1476                                 break;
1477                         }
1478                 }
1479                 zfcp_erp_port_access_denied(port, 55, fsf_req);
1480                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1481                 break;
1482
1483         case FSF_GENERIC_COMMAND_REJECTED:
1484                 ZFCP_LOG_INFO("generic service command rejected "
1485                               "(adapter %s, port d_id=0x%06x)\n",
1486                               zfcp_get_busid_by_port(port), port->d_id);
1487                 ZFCP_LOG_INFO("status qualifier:\n");
1488                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1489                               (char *) &header->fsf_status_qual,
1490                               sizeof (union fsf_status_qual));
1491                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1492                 break;
1493
1494         case FSF_PORT_HANDLE_NOT_VALID:
1495                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1496                                "0x%016Lx on adapter %s invalid. This may "
1497                                "happen occasionally.\n", port->handle,
1498                                port->wwpn, zfcp_get_busid_by_port(port));
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                 zfcp_erp_adapter_reopen(adapter, 0, 106, fsf_req);
1504                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1505                 break;
1506
1507         case FSF_PORT_BOXED:
1508                 ZFCP_LOG_INFO("port needs to be reopened "
1509                               "(adapter %s, port d_id=0x%06x)\n",
1510                               zfcp_get_busid_by_port(port), port->d_id);
1511                 zfcp_erp_port_boxed(port, 49, fsf_req);
1512                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1513                     | ZFCP_STATUS_FSFREQ_RETRY;
1514                 break;
1515
1516         /* following states should never occure, all cases avoided
1517            in zfcp_fsf_send_ct - but who knows ... */
1518         case FSF_PAYLOAD_SIZE_MISMATCH:
1519                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1520                               "req_buf_length=%d, resp_buf_length=%d)\n",
1521                               zfcp_get_busid_by_adapter(adapter),
1522                               bottom->req_buf_length, bottom->resp_buf_length);
1523                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1524                 break;
1525         case FSF_REQUEST_SIZE_TOO_LARGE:
1526                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1527                               "req_buf_length=%d)\n",
1528                               zfcp_get_busid_by_adapter(adapter),
1529                               bottom->req_buf_length);
1530                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1531                 break;
1532         case FSF_RESPONSE_SIZE_TOO_LARGE:
1533                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1534                               "resp_buf_length=%d)\n",
1535                               zfcp_get_busid_by_adapter(adapter),
1536                               bottom->resp_buf_length);
1537                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1538                 break;
1539         case FSF_SBAL_MISMATCH:
1540                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1541                               "resp_buf_length=%d)\n",
1542                               zfcp_get_busid_by_adapter(adapter),
1543                               bottom->req_buf_length, bottom->resp_buf_length);
1544                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1545                 break;
1546
1547        default:
1548                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1549                                 "(debug info 0x%x)\n", header->fsf_status);
1550                 break;
1551         }
1552
1553 skip_fsfstatus:
1554         send_ct->status = retval;
1555
1556         if (send_ct->handler != NULL)
1557                 send_ct->handler(send_ct->handler_data);
1558
1559         return retval;
1560 }
1561
1562 /**
1563  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1564  * @els: pointer to struct zfcp_send_els which contains all needed data for
1565  *      the command.
1566  */
1567 int
1568 zfcp_fsf_send_els(struct zfcp_send_els *els)
1569 {
1570         volatile struct qdio_buffer_element *sbale;
1571         struct zfcp_fsf_req *fsf_req;
1572         u32 d_id;
1573         struct zfcp_adapter *adapter;
1574         unsigned long lock_flags;
1575         int bytes;
1576         int ret = 0;
1577
1578         d_id = els->d_id;
1579         adapter = els->adapter;
1580
1581         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1582                                   ZFCP_REQ_AUTO_CLEANUP,
1583                                   NULL, &lock_flags, &fsf_req);
1584         if (ret < 0) {
1585                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1586                               "(adapter %s, port d_id: 0x%06x)\n",
1587                               zfcp_get_busid_by_adapter(adapter), d_id);
1588                 goto failed_req;
1589         }
1590
1591         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1592                         &els->port->status))) {
1593                 ret = -EBUSY;
1594                 goto port_blocked;
1595         }
1596
1597         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1598         if (zfcp_use_one_sbal(els->req, els->req_count,
1599                               els->resp, els->resp_count)){
1600                 /* both request buffer and response buffer
1601                    fit into one sbale each */
1602                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1603                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1604                 sbale[2].length = els->req[0].length;
1605                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1606                 sbale[3].length = els->resp[0].length;
1607                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1608         } else if (adapter->adapter_features &
1609                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1610                 /* try to use chained SBALs */
1611                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1612                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1613                                                 els->req, els->req_count,
1614                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1615                 if (bytes <= 0) {
1616                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1617                                       "(adapter %s, port d_id: 0x%06x)\n",
1618                                       zfcp_get_busid_by_adapter(adapter), d_id);
1619                         if (bytes == 0) {
1620                                 ret = -ENOMEM;
1621                         } else {
1622                                 ret = bytes;
1623                         }
1624                         goto failed_send;
1625                 }
1626                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1627                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1628                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1629                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1630                                                 els->resp, els->resp_count,
1631                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1632                 if (bytes <= 0) {
1633                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1634                                       "(adapter %s, port d_id: 0x%06x)\n",
1635                                       zfcp_get_busid_by_adapter(adapter), d_id);
1636                         if (bytes == 0) {
1637                                 ret = -ENOMEM;
1638                         } else {
1639                                 ret = bytes;
1640                         }
1641                         goto failed_send;
1642                 }
1643                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1644         } else {
1645                 /* reject request */
1646                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1647                               ", ELS request too big (adapter %s, "
1648                               "port d_id: 0x%06x)\n",
1649                               zfcp_get_busid_by_adapter(adapter), d_id);
1650                 ret = -EOPNOTSUPP;
1651                 goto failed_send;
1652         }
1653
1654         /* settings in QTCB */
1655         fsf_req->qtcb->bottom.support.d_id = d_id;
1656         fsf_req->qtcb->bottom.support.service_class =
1657                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1658         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1659         fsf_req->data = (unsigned long) els;
1660
1661         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1662
1663         zfcp_san_dbf_event_els_request(fsf_req);
1664
1665         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1666         ret = zfcp_fsf_req_send(fsf_req);
1667         if (ret) {
1668                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1669                                "(adapter %s, port d_id: 0x%06x)\n",
1670                                zfcp_get_busid_by_adapter(adapter), d_id);
1671                 goto failed_send;
1672         }
1673
1674         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1675                        "0x%06x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1676         goto out;
1677
1678  port_blocked:
1679  failed_send:
1680         zfcp_fsf_req_free(fsf_req);
1681
1682  failed_req:
1683  out:
1684         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1685                                 lock_flags);
1686
1687         return ret;
1688 }
1689
1690 /**
1691  * zfcp_fsf_send_els_handler - handler for ELS commands
1692  * @fsf_req: pointer to struct zfcp_fsf_req
1693  *
1694  * Data specific for the ELS command is passed using
1695  * fsf_req->data. There we find the pointer to struct zfcp_send_els.
1696  * Usually a specific handler for the ELS command is called which is
1697  * found in this structure.
1698  */
1699 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1700 {
1701         struct zfcp_adapter *adapter;
1702         struct zfcp_port *port;
1703         u32 d_id;
1704         struct fsf_qtcb_header *header;
1705         struct fsf_qtcb_bottom_support *bottom;
1706         struct zfcp_send_els *send_els;
1707         int retval = -EINVAL;
1708         u16 subtable, rule, counter;
1709
1710         send_els = (struct zfcp_send_els *) fsf_req->data;
1711         adapter = send_els->adapter;
1712         port = send_els->port;
1713         d_id = send_els->d_id;
1714         header = &fsf_req->qtcb->header;
1715         bottom = &fsf_req->qtcb->bottom.support;
1716
1717         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1718                 goto skip_fsfstatus;
1719
1720         switch (header->fsf_status) {
1721
1722         case FSF_GOOD:
1723                 zfcp_san_dbf_event_els_response(fsf_req);
1724                 retval = 0;
1725                 break;
1726
1727         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1728                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1729                               "class %d.\n",
1730                               zfcp_get_busid_by_adapter(adapter),
1731                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1732                 /* stop operation for this adapter */
1733                 zfcp_erp_adapter_shutdown(adapter, 0, 124, fsf_req);
1734                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1735                 break;
1736
1737         case FSF_ADAPTER_STATUS_AVAILABLE:
1738                 switch (header->fsf_status_qual.word[0]){
1739                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1740                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1741                                 zfcp_test_link(port);
1742                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1743                         break;
1744                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1745                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1746                         retval =
1747                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1748                                               (struct zfcp_ls_rjt_par *)
1749                                               &header->fsf_status_qual.word[2]);
1750                         break;
1751                 case FSF_SQ_RETRY_IF_POSSIBLE:
1752                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1753                         break;
1754                 default:
1755                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1756                                       header->fsf_status_qual.word[0]);
1757                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1758                                 (char*)header->fsf_status_qual.word, 16);
1759                 }
1760                 break;
1761
1762         case FSF_ELS_COMMAND_REJECTED:
1763                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1764                               "prohibited sending "
1765                               "(adapter: %s, port d_id: 0x%06x)\n",
1766                               zfcp_get_busid_by_adapter(adapter), d_id);
1767
1768                 break;
1769
1770         case FSF_PAYLOAD_SIZE_MISMATCH:
1771                 ZFCP_LOG_INFO(
1772                         "ELS request size and ELS response size must be either "
1773                         "both 0, or both greater than 0 "
1774                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1775                         zfcp_get_busid_by_adapter(adapter),
1776                         bottom->req_buf_length,
1777                         bottom->resp_buf_length);
1778                 break;
1779
1780         case FSF_REQUEST_SIZE_TOO_LARGE:
1781                 ZFCP_LOG_INFO(
1782                         "Length of the ELS request buffer, "
1783                         "specified in QTCB bottom, "
1784                         "exceeds the size of the buffers "
1785                         "that have been allocated for ELS request data "
1786                         "(adapter: %s, req_buf_length=%d)\n",
1787                         zfcp_get_busid_by_adapter(adapter),
1788                         bottom->req_buf_length);
1789                 break;
1790
1791         case FSF_RESPONSE_SIZE_TOO_LARGE:
1792                 ZFCP_LOG_INFO(
1793                         "Length of the ELS response buffer, "
1794                         "specified in QTCB bottom, "
1795                         "exceeds the size of the buffers "
1796                         "that have been allocated for ELS response data "
1797                         "(adapter: %s, resp_buf_length=%d)\n",
1798                         zfcp_get_busid_by_adapter(adapter),
1799                         bottom->resp_buf_length);
1800                 break;
1801
1802         case FSF_SBAL_MISMATCH:
1803                 /* should never occure, avoided in zfcp_fsf_send_els */
1804                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1805                               "resp_buf_length=%d)\n",
1806                               zfcp_get_busid_by_adapter(adapter),
1807                               bottom->req_buf_length, bottom->resp_buf_length);
1808                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1809                 break;
1810
1811         case FSF_ACCESS_DENIED:
1812                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1813                                 "(adapter %s, port d_id=0x%06x)\n",
1814                                 zfcp_get_busid_by_adapter(adapter), d_id);
1815                 for (counter = 0; counter < 2; counter++) {
1816                         subtable = header->fsf_status_qual.halfword[counter * 2];
1817                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1818                         switch (subtable) {
1819                         case FSF_SQ_CFDC_SUBTABLE_OS:
1820                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1821                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1822                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1823                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1824                                         zfcp_act_subtable_type[subtable], rule);
1825                                 break;
1826                         }
1827                 }
1828                 if (port != NULL)
1829                         zfcp_erp_port_access_denied(port, 56, fsf_req);
1830                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1831                 break;
1832
1833         default:
1834                 ZFCP_LOG_NORMAL(
1835                         "bug: An unknown FSF Status was presented "
1836                         "(adapter: %s, fsf_status=0x%08x)\n",
1837                         zfcp_get_busid_by_adapter(adapter),
1838                         header->fsf_status);
1839                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1840                 break;
1841         }
1842
1843 skip_fsfstatus:
1844         send_els->status = retval;
1845
1846         if (send_els->handler)
1847                 send_els->handler(send_els->handler_data);
1848
1849         return retval;
1850 }
1851
1852 int
1853 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1854 {
1855         volatile struct qdio_buffer_element *sbale;
1856         struct zfcp_fsf_req *fsf_req;
1857         struct zfcp_adapter *adapter = erp_action->adapter;
1858         unsigned long lock_flags;
1859         int retval;
1860
1861         /* setup new FSF request */
1862         retval = zfcp_fsf_req_create(adapter,
1863                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1864                                      ZFCP_REQ_AUTO_CLEANUP,
1865                                      adapter->pool.fsf_req_erp,
1866                                      &lock_flags, &fsf_req);
1867         if (retval) {
1868                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1869                               "data request for adapter %s.\n",
1870                               zfcp_get_busid_by_adapter(adapter));
1871                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1872                                         lock_flags);
1873                 return retval;
1874         }
1875
1876         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1877         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1878         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1879
1880         fsf_req->qtcb->bottom.config.feature_selection =
1881                         FSF_FEATURE_CFDC |
1882                         FSF_FEATURE_LUN_SHARING |
1883                         FSF_FEATURE_NOTIFICATION_LOST |
1884                         FSF_FEATURE_UPDATE_ALERT;
1885         fsf_req->erp_action = erp_action;
1886         erp_action->fsf_req = fsf_req;
1887
1888         zfcp_erp_start_timer(fsf_req);
1889         retval = zfcp_fsf_req_send(fsf_req);
1890         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1891                                 lock_flags);
1892         if (retval) {
1893                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1894                               "data command on the adapter %s\n",
1895                               zfcp_get_busid_by_adapter(adapter));
1896                 zfcp_fsf_req_free(fsf_req);
1897                 erp_action->fsf_req = NULL;
1898         }
1899         else
1900                 ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1901                                "(adapter %s)\n",
1902                                zfcp_get_busid_by_adapter(adapter));
1903
1904         return retval;
1905 }
1906
1907 int
1908 zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1909                                 struct fsf_qtcb_bottom_config *data)
1910 {
1911         volatile struct qdio_buffer_element *sbale;
1912         struct zfcp_fsf_req *fsf_req;
1913         unsigned long lock_flags;
1914         int retval;
1915
1916         /* setup new FSF request */
1917         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1918                                      ZFCP_WAIT_FOR_SBAL, NULL, &lock_flags,
1919                                      &fsf_req);
1920         if (retval) {
1921                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1922                               "data request for adapter %s.\n",
1923                               zfcp_get_busid_by_adapter(adapter));
1924                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1925                                         lock_flags);
1926                 return retval;
1927         }
1928
1929         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1930         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1931         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1932
1933         fsf_req->qtcb->bottom.config.feature_selection =
1934                         FSF_FEATURE_CFDC |
1935                         FSF_FEATURE_LUN_SHARING |
1936                         FSF_FEATURE_NOTIFICATION_LOST |
1937                         FSF_FEATURE_UPDATE_ALERT;
1938
1939         if (data)
1940                 fsf_req->data = (unsigned long) data;
1941
1942         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1943         retval = zfcp_fsf_req_send(fsf_req);
1944         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1945                                 lock_flags);
1946         if (retval)
1947                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1948                               "data command on the adapter %s\n",
1949                               zfcp_get_busid_by_adapter(adapter));
1950         else
1951                 wait_event(fsf_req->completion_wq,
1952                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1953
1954         zfcp_fsf_req_free(fsf_req);
1955
1956         return retval;
1957 }
1958
1959 /**
1960  * zfcp_fsf_exchange_config_evaluate
1961  * @fsf_req: fsf_req which belongs to xchg config data request
1962  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1963  *
1964  * returns: -EIO on error, 0 otherwise
1965  */
1966 static int
1967 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
1968 {
1969         struct fsf_qtcb_bottom_config *bottom;
1970         struct zfcp_adapter *adapter = fsf_req->adapter;
1971         struct Scsi_Host *shost = adapter->scsi_host;
1972
1973         bottom = &fsf_req->qtcb->bottom.config;
1974         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
1975                        bottom->low_qtcb_version, bottom->high_qtcb_version);
1976         adapter->fsf_lic_version = bottom->lic_version;
1977         adapter->adapter_features = bottom->adapter_features;
1978         adapter->connection_features = bottom->connection_features;
1979         adapter->peer_wwpn = 0;
1980         adapter->peer_wwnn = 0;
1981         adapter->peer_d_id = 0;
1982
1983         if (xchg_ok) {
1984
1985                 if (fsf_req->data)
1986                         memcpy((struct fsf_qtcb_bottom_config *) fsf_req->data,
1987                                 bottom, sizeof (struct fsf_qtcb_bottom_config));
1988
1989                 fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
1990                 fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
1991                 fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
1992                 fc_host_speed(shost) = bottom->fc_link_speed;
1993                 fc_host_supported_classes(shost) =
1994                                 FC_COS_CLASS2 | FC_COS_CLASS3;
1995                 adapter->hydra_version = bottom->adapter_type;
1996                 adapter->timer_ticks = bottom->timer_interval;
1997                 if (fc_host_permanent_port_name(shost) == -1)
1998                         fc_host_permanent_port_name(shost) =
1999                                 fc_host_port_name(shost);
2000                 if (bottom->fc_topology == FSF_TOPO_P2P) {
2001                         adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2002                         adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2003                         adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2004                         fc_host_port_type(shost) = FC_PORTTYPE_PTP;
2005                 } else if (bottom->fc_topology == FSF_TOPO_FABRIC)
2006                         fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
2007                 else if (bottom->fc_topology == FSF_TOPO_AL)
2008                         fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
2009                 else
2010                         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2011         } else {
2012                 fc_host_node_name(shost) = 0;
2013                 fc_host_port_name(shost) = 0;
2014                 fc_host_port_id(shost) = 0;
2015                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
2016                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2017                 adapter->hydra_version = 0;
2018         }
2019
2020         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
2021                 adapter->hardware_version = bottom->hardware_version;
2022                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
2023                        min(FC_SERIAL_NUMBER_SIZE, 17));
2024                 EBCASC(fc_host_serial_number(shost),
2025                        min(FC_SERIAL_NUMBER_SIZE, 17));
2026         }
2027
2028         if (fsf_req->erp_action)
2029                 ZFCP_LOG_NORMAL("The adapter %s reported the following "
2030                                 "characteristics:\n"
2031                                 "WWNN 0x%016Lx, WWPN 0x%016Lx, "
2032                                 "S_ID 0x%06x,\n"
2033                                 "adapter version 0x%x, "
2034                                 "LIC version 0x%x, "
2035                                 "FC link speed %d Gb/s\n",
2036                                 zfcp_get_busid_by_adapter(adapter),
2037                                 (wwn_t) fc_host_node_name(shost),
2038                                 (wwn_t) fc_host_port_name(shost),
2039                                 fc_host_port_id(shost),
2040                                 adapter->hydra_version,
2041                                 adapter->fsf_lic_version,
2042                                 fc_host_speed(shost));
2043         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2044                 ZFCP_LOG_NORMAL("error: the adapter %s "
2045                                 "only supports newer control block "
2046                                 "versions in comparison to this device "
2047                                 "driver (try updated device driver)\n",
2048                                 zfcp_get_busid_by_adapter(adapter));
2049                 zfcp_erp_adapter_shutdown(adapter, 0, 125, fsf_req);
2050                 return -EIO;
2051         }
2052         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2053                 ZFCP_LOG_NORMAL("error: the adapter %s "
2054                                 "only supports older control block "
2055                                 "versions than this device driver uses"
2056                                 "(consider a microcode upgrade)\n",
2057                                 zfcp_get_busid_by_adapter(adapter));
2058                 zfcp_erp_adapter_shutdown(adapter, 0, 126, fsf_req);
2059                 return -EIO;
2060         }
2061         return 0;
2062 }
2063
2064 /**
2065  * function:    zfcp_fsf_exchange_config_data_handler
2066  *
2067  * purpose:     is called for finished Exchange Configuration Data command
2068  *
2069  * returns:
2070  */
2071 static int
2072 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2073 {
2074         struct fsf_qtcb_bottom_config *bottom;
2075         struct zfcp_adapter *adapter = fsf_req->adapter;
2076         struct fsf_qtcb *qtcb = fsf_req->qtcb;
2077
2078         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2079                 return -EIO;
2080
2081         switch (qtcb->header.fsf_status) {
2082
2083         case FSF_GOOD:
2084                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2085                         return -EIO;
2086
2087                 switch (fc_host_port_type(adapter->scsi_host)) {
2088                 case FC_PORTTYPE_PTP:
2089                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2090                                         "configuration detected at adapter %s\n"
2091                                         "Peer WWNN 0x%016llx, "
2092                                         "peer WWPN 0x%016llx, "
2093                                         "peer d_id 0x%06x\n",
2094                                         zfcp_get_busid_by_adapter(adapter),
2095                                         adapter->peer_wwnn,
2096                                         adapter->peer_wwpn,
2097                                         adapter->peer_d_id);
2098                         break;
2099                 case FC_PORTTYPE_NLPORT:
2100                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2101                                         "topology detected at adapter %s "
2102                                         "unsupported, shutting down adapter\n",
2103                                         zfcp_get_busid_by_adapter(adapter));
2104                         zfcp_erp_adapter_shutdown(adapter, 0, 127, fsf_req);
2105                         return -EIO;
2106                 case FC_PORTTYPE_NPORT:
2107                         if (fsf_req->erp_action)
2108                                 ZFCP_LOG_NORMAL("Switched fabric fibrechannel "
2109                                                 "network detected at adapter "
2110                                                 "%s.\n",
2111                                         zfcp_get_busid_by_adapter(adapter));
2112                         break;
2113                 default:
2114                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2115                                         "reported by the exchange "
2116                                         "configuration command for "
2117                                         "the adapter %s is not "
2118                                         "of a type known to the zfcp "
2119                                         "driver, shutting down adapter\n",
2120                                         zfcp_get_busid_by_adapter(adapter));
2121                         zfcp_erp_adapter_shutdown(adapter, 0, 128, fsf_req);
2122                         return -EIO;
2123                 }
2124                 bottom = &qtcb->bottom.config;
2125                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2126                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2127                                         "allowed by the adapter %s "
2128                                         "is lower than the minimum "
2129                                         "required by the driver (%ld bytes).\n",
2130                                         bottom->max_qtcb_size,
2131                                         zfcp_get_busid_by_adapter(adapter),
2132                                         sizeof(struct fsf_qtcb));
2133                         zfcp_erp_adapter_shutdown(adapter, 0, 129, fsf_req);
2134                         return -EIO;
2135                 }
2136                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2137                                 &adapter->status);
2138                 break;
2139         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2140                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2141                         return -EIO;
2142
2143                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2144                                 &adapter->status);
2145
2146                 zfcp_fsf_link_down_info_eval(fsf_req, 42,
2147                         &qtcb->header.fsf_status_qual.link_down_info);
2148                 break;
2149         default:
2150                 zfcp_erp_adapter_shutdown(adapter, 0, 130, fsf_req);
2151                 return -EIO;
2152         }
2153         return 0;
2154 }
2155
2156 /**
2157  * zfcp_fsf_exchange_port_data - request information about local port
2158  * @erp_action: ERP action for the adapter for which port data is requested
2159  */
2160 int
2161 zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
2162 {
2163         volatile struct qdio_buffer_element *sbale;
2164         struct zfcp_fsf_req *fsf_req;
2165         struct zfcp_adapter *adapter = erp_action->adapter;
2166         unsigned long lock_flags;
2167         int retval;
2168
2169         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2170                 ZFCP_LOG_INFO("error: exchange port data "
2171                               "command not supported by adapter %s\n",
2172                               zfcp_get_busid_by_adapter(adapter));
2173                 return -EOPNOTSUPP;
2174         }
2175
2176         /* setup new FSF request */
2177         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2178                                      ZFCP_REQ_AUTO_CLEANUP,
2179                                      adapter->pool.fsf_req_erp,
2180                                      &lock_flags, &fsf_req);
2181         if (retval) {
2182                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2183                               "exchange port data request for "
2184                               "the adapter %s.\n",
2185                               zfcp_get_busid_by_adapter(adapter));
2186                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2187                                         lock_flags);
2188                 return retval;
2189         }
2190
2191         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2192         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2193         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2194
2195         erp_action->fsf_req = fsf_req;
2196         fsf_req->erp_action = erp_action;
2197         zfcp_erp_start_timer(fsf_req);
2198
2199         retval = zfcp_fsf_req_send(fsf_req);
2200         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2201
2202         if (retval) {
2203                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2204                               "command on the adapter %s\n",
2205                               zfcp_get_busid_by_adapter(adapter));
2206                 zfcp_fsf_req_free(fsf_req);
2207                 erp_action->fsf_req = NULL;
2208         }
2209         else
2210                 ZFCP_LOG_DEBUG("exchange port data request initiated "
2211                                "(adapter %s)\n",
2212                                zfcp_get_busid_by_adapter(adapter));
2213         return retval;
2214 }
2215
2216
2217 /**
2218  * zfcp_fsf_exchange_port_data_sync - request information about local port
2219  * and wait until information is ready
2220  */
2221 int
2222 zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
2223                                 struct fsf_qtcb_bottom_port *data)
2224 {
2225         volatile struct qdio_buffer_element *sbale;
2226         struct zfcp_fsf_req *fsf_req;
2227         unsigned long lock_flags;
2228         int retval;
2229
2230         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2231                 ZFCP_LOG_INFO("error: exchange port data "
2232                               "command not supported by adapter %s\n",
2233                               zfcp_get_busid_by_adapter(adapter));
2234                 return -EOPNOTSUPP;
2235         }
2236
2237         /* setup new FSF request */
2238         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2239                                 0, NULL, &lock_flags, &fsf_req);
2240         if (retval) {
2241                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2242                               "exchange port data request for "
2243                               "the adapter %s.\n",
2244                               zfcp_get_busid_by_adapter(adapter));
2245                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2246                                         lock_flags);
2247                 return retval;
2248         }
2249
2250         if (data)
2251                 fsf_req->data = (unsigned long) data;
2252
2253         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2254         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2255         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2256
2257         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
2258         retval = zfcp_fsf_req_send(fsf_req);
2259         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2260
2261         if (retval)
2262                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2263                               "command on the adapter %s\n",
2264                               zfcp_get_busid_by_adapter(adapter));
2265         else
2266                 wait_event(fsf_req->completion_wq,
2267                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2268
2269         zfcp_fsf_req_free(fsf_req);
2270
2271         return retval;
2272 }
2273
2274 /**
2275  * zfcp_fsf_exchange_port_evaluate
2276  * @fsf_req: fsf_req which belongs to xchg port data request
2277  * @xchg_ok: specifies if xchg port data was incomplete or complete (0/1)
2278  */
2279 static void
2280 zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
2281 {
2282         struct zfcp_adapter *adapter;
2283         struct fsf_qtcb_bottom_port *bottom;
2284         struct Scsi_Host *shost;
2285
2286         adapter = fsf_req->adapter;
2287         bottom = &fsf_req->qtcb->bottom.port;
2288         shost = adapter->scsi_host;
2289
2290         if (fsf_req->data)
2291                 memcpy((struct fsf_qtcb_bottom_port*) fsf_req->data, bottom,
2292                         sizeof(struct fsf_qtcb_bottom_port));
2293
2294         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
2295                 fc_host_permanent_port_name(shost) = bottom->wwpn;
2296         else
2297                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
2298         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
2299         fc_host_supported_speeds(shost) = bottom->supported_speed;
2300 }
2301
2302 /**
2303  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2304  * @fsf_req: pointer to struct zfcp_fsf_req
2305  */
2306 static void
2307 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2308 {
2309         struct zfcp_adapter *adapter;
2310         struct fsf_qtcb *qtcb;
2311
2312         adapter = fsf_req->adapter;
2313         qtcb = fsf_req->qtcb;
2314
2315         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2316                 return;
2317
2318         switch (qtcb->header.fsf_status) {
2319         case FSF_GOOD:
2320                 zfcp_fsf_exchange_port_evaluate(fsf_req, 1);
2321                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2322                 break;
2323         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2324                 zfcp_fsf_exchange_port_evaluate(fsf_req, 0);
2325                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2326                 zfcp_fsf_link_down_info_eval(fsf_req, 43,
2327                         &qtcb->header.fsf_status_qual.link_down_info);
2328                 break;
2329         }
2330 }
2331
2332
2333 /*
2334  * function:    zfcp_fsf_open_port
2335  *
2336  * purpose:
2337  *
2338  * returns:     address of initiated FSF request
2339  *              NULL - request could not be initiated
2340  */
2341 int
2342 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2343 {
2344         volatile struct qdio_buffer_element *sbale;
2345         struct zfcp_fsf_req *fsf_req;
2346         unsigned long lock_flags;
2347         int retval = 0;
2348
2349         /* setup new FSF request */
2350         retval = zfcp_fsf_req_create(erp_action->adapter,
2351                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2352                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2353                                      erp_action->adapter->pool.fsf_req_erp,
2354                                      &lock_flags, &fsf_req);
2355         if (retval < 0) {
2356                 ZFCP_LOG_INFO("error: Could not create open port request "
2357                               "for port 0x%016Lx on adapter %s.\n",
2358                               erp_action->port->wwpn,
2359                               zfcp_get_busid_by_adapter(erp_action->adapter));
2360                 goto out;
2361         }
2362
2363         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2364         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2365         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2366
2367         fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2368         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2369         fsf_req->data = (unsigned long) erp_action->port;
2370         fsf_req->erp_action = erp_action;
2371         erp_action->fsf_req = fsf_req;
2372
2373         zfcp_erp_start_timer(fsf_req);
2374         retval = zfcp_fsf_req_send(fsf_req);
2375         if (retval) {
2376                 ZFCP_LOG_INFO("error: Could not send open port request for "
2377                               "port 0x%016Lx on adapter %s.\n",
2378                               erp_action->port->wwpn,
2379                               zfcp_get_busid_by_adapter(erp_action->adapter));
2380                 zfcp_fsf_req_free(fsf_req);
2381                 erp_action->fsf_req = NULL;
2382                 goto out;
2383         }
2384
2385         ZFCP_LOG_DEBUG("open port request initiated "
2386                        "(adapter %s,  port 0x%016Lx)\n",
2387                        zfcp_get_busid_by_adapter(erp_action->adapter),
2388                        erp_action->port->wwpn);
2389  out:
2390         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2391                                 lock_flags);
2392         return retval;
2393 }
2394
2395 /*
2396  * function:    zfcp_fsf_open_port_handler
2397  *
2398  * purpose:     is called for finished Open Port command
2399  *
2400  * returns:
2401  */
2402 static int
2403 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2404 {
2405         int retval = -EINVAL;
2406         struct zfcp_port *port;
2407         struct fsf_plogi *plogi;
2408         struct fsf_qtcb_header *header;
2409         u16 subtable, rule, counter;
2410
2411         port = (struct zfcp_port *) fsf_req->data;
2412         header = &fsf_req->qtcb->header;
2413
2414         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2415                 /* don't change port status in our bookkeeping */
2416                 goto skip_fsfstatus;
2417         }
2418
2419         /* evaluate FSF status in QTCB */
2420         switch (header->fsf_status) {
2421
2422         case FSF_PORT_ALREADY_OPEN:
2423                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2424                                 "is already open.\n",
2425                                 port->wwpn, zfcp_get_busid_by_port(port));
2426                 /*
2427                  * This is a bug, however operation should continue normally
2428                  * if it is simply ignored
2429                  */
2430                 break;
2431
2432         case FSF_ACCESS_DENIED:
2433                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2434                                 "on adapter %s\n",
2435                                 port->wwpn, zfcp_get_busid_by_port(port));
2436                 for (counter = 0; counter < 2; counter++) {
2437                         subtable = header->fsf_status_qual.halfword[counter * 2];
2438                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2439                         switch (subtable) {
2440                         case FSF_SQ_CFDC_SUBTABLE_OS:
2441                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2442                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2443                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2444                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2445                                         zfcp_act_subtable_type[subtable], rule);
2446                                 break;
2447                         }
2448                 }
2449                 zfcp_erp_port_access_denied(port, 57, fsf_req);
2450                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2451                 break;
2452
2453         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2454                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2455                               "The remote port 0x%016Lx on adapter %s "
2456                               "could not be opened. Disabling it.\n",
2457                               port->wwpn, zfcp_get_busid_by_port(port));
2458                 zfcp_erp_port_failed(port, 31, fsf_req);
2459                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2460                 break;
2461
2462         case FSF_ADAPTER_STATUS_AVAILABLE:
2463                 switch (header->fsf_status_qual.word[0]) {
2464                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2465                         /* ERP strategy will escalate */
2466                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2467                         break;
2468                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2469                         /* ERP strategy will escalate */
2470                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2471                         break;
2472                 case FSF_SQ_NO_RETRY_POSSIBLE:
2473                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2474                                         "adapter %s could not be opened. "
2475                                         "Disabling it.\n",
2476                                         port->wwpn,
2477                                         zfcp_get_busid_by_port(port));
2478                         zfcp_erp_port_failed(port, 32, fsf_req);
2479                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2480                         break;
2481                 default:
2482                         ZFCP_LOG_NORMAL
2483                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2484                              header->fsf_status_qual.word[0]);
2485                         break;
2486                 }
2487                 break;
2488
2489         case FSF_GOOD:
2490                 /* save port handle assigned by FSF */
2491                 port->handle = header->port_handle;
2492                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2493                               "was opened, it's port handle is 0x%x\n",
2494                               port->wwpn, zfcp_get_busid_by_port(port),
2495                               port->handle);
2496                 /* mark port as open */
2497                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2498                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2499                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2500                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2501                                   &port->status);
2502                 retval = 0;
2503                 /* check whether D_ID has changed during open */
2504                 /*
2505                  * FIXME: This check is not airtight, as the FCP channel does
2506                  * not monitor closures of target port connections caused on
2507                  * the remote side. Thus, they might miss out on invalidating
2508                  * locally cached WWPNs (and other N_Port parameters) of gone
2509                  * target ports. So, our heroic attempt to make things safe
2510                  * could be undermined by 'open port' response data tagged with
2511                  * obsolete WWPNs. Another reason to monitor potential
2512                  * connection closures ourself at least (by interpreting
2513                  * incoming ELS' and unsolicited status). It just crosses my
2514                  * mind that one should be able to cross-check by means of
2515                  * another GID_PN straight after a port has been opened.
2516                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2517                  */
2518                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2519                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2520                 {
2521                         if (fsf_req->qtcb->bottom.support.els1_length <
2522                             sizeof (struct fsf_plogi)) {
2523                                 ZFCP_LOG_INFO(
2524                                         "warning: insufficient length of "
2525                                         "PLOGI payload (%i)\n",
2526                                         fsf_req->qtcb->bottom.support.els1_length);
2527                                 /* skip sanity check and assume wwpn is ok */
2528                         } else {
2529                                 if (plogi->serv_param.wwpn != port->wwpn) {
2530                                         ZFCP_LOG_INFO("warning: d_id of port "
2531                                                       "0x%016Lx changed during "
2532                                                       "open\n", port->wwpn);
2533                                         atomic_clear_mask(
2534                                                 ZFCP_STATUS_PORT_DID_DID,
2535                                                 &port->status);
2536                                 } else {
2537                                         port->wwnn = plogi->serv_param.wwnn;
2538                                         zfcp_plogi_evaluate(port, plogi);
2539                                 }
2540                         }
2541                 }
2542                 break;
2543
2544         case FSF_UNKNOWN_OP_SUBTYPE:
2545                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2546                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2547                               "op_subtype=0x%x)\n",
2548                               zfcp_get_busid_by_port(port),
2549                               fsf_req->qtcb->bottom.support.operation_subtype);
2550                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2551                 break;
2552
2553         default:
2554                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2555                                 "(debug info 0x%x)\n",
2556                                 header->fsf_status);
2557                 break;
2558         }
2559
2560  skip_fsfstatus:
2561         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2562         return retval;
2563 }
2564
2565 /*
2566  * function:    zfcp_fsf_close_port
2567  *
2568  * purpose:     submit FSF command "close port"
2569  *
2570  * returns:     address of initiated FSF request
2571  *              NULL - request could not be initiated
2572  */
2573 int
2574 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2575 {
2576         volatile struct qdio_buffer_element *sbale;
2577         struct zfcp_fsf_req *fsf_req;
2578         unsigned long lock_flags;
2579         int retval = 0;
2580
2581         /* setup new FSF request */
2582         retval = zfcp_fsf_req_create(erp_action->adapter,
2583                                      FSF_QTCB_CLOSE_PORT,
2584                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2585                                      erp_action->adapter->pool.fsf_req_erp,
2586                                      &lock_flags, &fsf_req);
2587         if (retval < 0) {
2588                 ZFCP_LOG_INFO("error: Could not create a close port request "
2589                               "for port 0x%016Lx on adapter %s.\n",
2590                               erp_action->port->wwpn,
2591                               zfcp_get_busid_by_adapter(erp_action->adapter));
2592                 goto out;
2593         }
2594
2595         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2596         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2597         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2598
2599         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2600         fsf_req->data = (unsigned long) erp_action->port;
2601         fsf_req->erp_action = erp_action;
2602         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2603         fsf_req->erp_action = erp_action;
2604         erp_action->fsf_req = fsf_req;
2605
2606         zfcp_erp_start_timer(fsf_req);
2607         retval = zfcp_fsf_req_send(fsf_req);
2608         if (retval) {
2609                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2610                               "port 0x%016Lx on adapter %s.\n",
2611                               erp_action->port->wwpn,
2612                               zfcp_get_busid_by_adapter(erp_action->adapter));
2613                 zfcp_fsf_req_free(fsf_req);
2614                 erp_action->fsf_req = NULL;
2615                 goto out;
2616         }
2617
2618         ZFCP_LOG_TRACE("close port request initiated "
2619                        "(adapter %s, port 0x%016Lx)\n",
2620                        zfcp_get_busid_by_adapter(erp_action->adapter),
2621                        erp_action->port->wwpn);
2622  out:
2623         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2624                                 lock_flags);
2625         return retval;
2626 }
2627
2628 /*
2629  * function:    zfcp_fsf_close_port_handler
2630  *
2631  * purpose:     is called for finished Close Port FSF command
2632  *
2633  * returns:
2634  */
2635 static int
2636 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2637 {
2638         int retval = -EINVAL;
2639         struct zfcp_port *port;
2640
2641         port = (struct zfcp_port *) fsf_req->data;
2642
2643         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2644                 /* don't change port status in our bookkeeping */
2645                 goto skip_fsfstatus;
2646         }
2647
2648         /* evaluate FSF status in QTCB */
2649         switch (fsf_req->qtcb->header.fsf_status) {
2650
2651         case FSF_PORT_HANDLE_NOT_VALID:
2652                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2653                               "0x%016Lx on adapter %s invalid. This may happen "
2654                               "occasionally.\n", port->handle,
2655                               port->wwpn, zfcp_get_busid_by_port(port));
2656                 ZFCP_LOG_DEBUG("status qualifier:\n");
2657                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2658                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2659                               sizeof (union fsf_status_qual));
2660                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, fsf_req);
2661                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2662                 break;
2663
2664         case FSF_ADAPTER_STATUS_AVAILABLE:
2665                 /* Note: FSF has actually closed the port in this case.
2666                  * The status code is just daft. Fingers crossed for a change
2667                  */
2668                 retval = 0;
2669                 break;
2670
2671         case FSF_GOOD:
2672                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2673                                "port handle 0x%x\n", port->wwpn,
2674                                zfcp_get_busid_by_port(port), port->handle);
2675                 zfcp_erp_modify_port_status(port, 33, fsf_req,
2676                                             ZFCP_STATUS_COMMON_OPEN,
2677                                             ZFCP_CLEAR);
2678                 retval = 0;
2679                 break;
2680
2681         default:
2682                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2683                                 "(debug info 0x%x)\n",
2684                                 fsf_req->qtcb->header.fsf_status);
2685                 break;
2686         }
2687
2688  skip_fsfstatus:
2689         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2690         return retval;
2691 }
2692
2693 /*
2694  * function:    zfcp_fsf_close_physical_port
2695  *
2696  * purpose:     submit FSF command "close physical port"
2697  *
2698  * returns:     address of initiated FSF request
2699  *              NULL - request could not be initiated
2700  */
2701 int
2702 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2703 {
2704         volatile struct qdio_buffer_element *sbale;
2705         struct zfcp_fsf_req *fsf_req;
2706         unsigned long lock_flags;
2707         int retval = 0;
2708
2709         /* setup new FSF request */
2710         retval = zfcp_fsf_req_create(erp_action->adapter,
2711                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2712                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2713                                      erp_action->adapter->pool.fsf_req_erp,
2714                                      &lock_flags, &fsf_req);
2715         if (retval < 0) {
2716                 ZFCP_LOG_INFO("error: Could not create close physical port "
2717                               "request (adapter %s, port 0x%016Lx)\n",
2718                               zfcp_get_busid_by_adapter(erp_action->adapter),
2719                               erp_action->port->wwpn);
2720
2721                 goto out;
2722         }
2723
2724         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2725         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2726         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2727
2728         /* mark port as being closed */
2729         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2730                         &erp_action->port->status);
2731         /* save a pointer to this port */
2732         fsf_req->data = (unsigned long) erp_action->port;
2733         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2734         fsf_req->erp_action = erp_action;
2735         erp_action->fsf_req = fsf_req;
2736
2737         zfcp_erp_start_timer(fsf_req);
2738         retval = zfcp_fsf_req_send(fsf_req);
2739         if (retval) {
2740                 ZFCP_LOG_INFO("error: Could not send close physical port "
2741                               "request (adapter %s, port 0x%016Lx)\n",
2742                               zfcp_get_busid_by_adapter(erp_action->adapter),
2743                               erp_action->port->wwpn);
2744                 zfcp_fsf_req_free(fsf_req);
2745                 erp_action->fsf_req = NULL;
2746                 goto out;
2747         }
2748
2749         ZFCP_LOG_TRACE("close physical port request initiated "
2750                        "(adapter %s, port 0x%016Lx)\n",
2751                        zfcp_get_busid_by_adapter(erp_action->adapter),
2752                        erp_action->port->wwpn);
2753  out:
2754         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2755                                 lock_flags);
2756         return retval;
2757 }
2758
2759 /*
2760  * function:    zfcp_fsf_close_physical_port_handler
2761  *
2762  * purpose:     is called for finished Close Physical Port FSF command
2763  *
2764  * returns:
2765  */
2766 static int
2767 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2768 {
2769         int retval = -EINVAL;
2770         struct zfcp_port *port;
2771         struct zfcp_unit *unit;
2772         struct fsf_qtcb_header *header;
2773         u16 subtable, rule, counter;
2774
2775         port = (struct zfcp_port *) fsf_req->data;
2776         header = &fsf_req->qtcb->header;
2777
2778         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2779                 /* don't change port status in our bookkeeping */
2780                 goto skip_fsfstatus;
2781         }
2782
2783         /* evaluate FSF status in QTCB */
2784         switch (header->fsf_status) {
2785
2786         case FSF_PORT_HANDLE_NOT_VALID:
2787                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2788                               "(adapter %s, port 0x%016Lx). "
2789                               "This may happen occasionally.\n",
2790                               port->handle,
2791                               zfcp_get_busid_by_port(port),
2792                               port->wwpn);
2793                 ZFCP_LOG_DEBUG("status qualifier:\n");
2794                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2795                               (char *) &header->fsf_status_qual,
2796                               sizeof (union fsf_status_qual));
2797                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, fsf_req);
2798                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2799                 break;
2800
2801         case FSF_ACCESS_DENIED:
2802                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2803                                 "physical port 0x%016Lx on adapter %s\n",
2804                                 port->wwpn, zfcp_get_busid_by_port(port));
2805                 for (counter = 0; counter < 2; counter++) {
2806                         subtable = header->fsf_status_qual.halfword[counter * 2];
2807                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2808                         switch (subtable) {
2809                         case FSF_SQ_CFDC_SUBTABLE_OS:
2810                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2811                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2812                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2813                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2814                                         zfcp_act_subtable_type[subtable], rule);
2815                                 break;
2816                         }
2817                 }
2818                 zfcp_erp_port_access_denied(port, 58, fsf_req);
2819                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2820                 break;
2821
2822         case FSF_PORT_BOXED:
2823                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2824                                "%s needs to be reopened but it was attempted "
2825                                "to close it physically.\n",
2826                                port->wwpn,
2827                                zfcp_get_busid_by_port(port));
2828                 zfcp_erp_port_boxed(port, 50, fsf_req);
2829                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2830                         ZFCP_STATUS_FSFREQ_RETRY;
2831
2832                 /* can't use generic zfcp_erp_modify_port_status because
2833                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
2834                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2835                 list_for_each_entry(unit, &port->unit_list_head, list)
2836                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
2837                                           &unit->status);
2838                 break;
2839
2840         case FSF_ADAPTER_STATUS_AVAILABLE:
2841                 switch (header->fsf_status_qual.word[0]) {
2842                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2843                         /* This will now be escalated by ERP */
2844                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2845                         break;
2846                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2847                         /* ERP strategy will escalate */
2848                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2849                         break;
2850                 default:
2851                         ZFCP_LOG_NORMAL
2852                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2853                              header->fsf_status_qual.word[0]);
2854                         break;
2855                 }
2856                 break;
2857
2858         case FSF_GOOD:
2859                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2860                                "physically closed, port handle 0x%x\n",
2861                                port->wwpn,
2862                                zfcp_get_busid_by_port(port), port->handle);
2863                 /* can't use generic zfcp_erp_modify_port_status because
2864                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2865                  */
2866                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2867                 list_for_each_entry(unit, &port->unit_list_head, list)
2868                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2869                 retval = 0;
2870                 break;
2871
2872         default:
2873                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2874                                 "(debug info 0x%x)\n",
2875                                 header->fsf_status);
2876                 break;
2877         }
2878
2879  skip_fsfstatus:
2880         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2881         return retval;
2882 }
2883
2884 /*
2885  * function:    zfcp_fsf_open_unit
2886  *
2887  * purpose:
2888  *
2889  * returns:
2890  *
2891  * assumptions: This routine does not check whether the associated
2892  *              remote port has already been opened. This should be
2893  *              done by calling routines. Otherwise some status
2894  *              may be presented by FSF
2895  */
2896 int
2897 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2898 {
2899         volatile struct qdio_buffer_element *sbale;
2900         struct zfcp_fsf_req *fsf_req;
2901         unsigned long lock_flags;
2902         int retval = 0;
2903
2904         /* setup new FSF request */
2905         retval = zfcp_fsf_req_create(erp_action->adapter,
2906                                      FSF_QTCB_OPEN_LUN,
2907                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2908                                      erp_action->adapter->pool.fsf_req_erp,
2909                                      &lock_flags, &fsf_req);
2910         if (retval < 0) {
2911                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2912                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2913                               erp_action->unit->fcp_lun,
2914                               erp_action->unit->port->wwpn,
2915                               zfcp_get_busid_by_adapter(erp_action->adapter));
2916                 goto out;
2917         }
2918
2919         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2920         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2921         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2922
2923         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2924         fsf_req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
2925         if (!(erp_action->adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2926                 fsf_req->qtcb->bottom.support.option =
2927                         FSF_OPEN_LUN_SUPPRESS_BOXING;
2928         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2929         fsf_req->data = (unsigned long) erp_action->unit;
2930         fsf_req->erp_action = erp_action;
2931         erp_action->fsf_req = fsf_req;
2932
2933         zfcp_erp_start_timer(fsf_req);
2934         retval = zfcp_fsf_req_send(erp_action->fsf_req);
2935         if (retval) {
2936                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2937                               "on the adapter %s, port 0x%016Lx for "
2938                               "unit 0x%016Lx\n",
2939                               zfcp_get_busid_by_adapter(erp_action->adapter),
2940                               erp_action->port->wwpn,
2941                               erp_action->unit->fcp_lun);
2942                 zfcp_fsf_req_free(fsf_req);
2943                 erp_action->fsf_req = NULL;
2944                 goto out;
2945         }
2946
2947         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2948                        "port 0x%016Lx, unit 0x%016Lx)\n",
2949                        zfcp_get_busid_by_adapter(erp_action->adapter),
2950                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2951  out:
2952         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2953                                 lock_flags);
2954         return retval;
2955 }
2956
2957 /*
2958  * function:    zfcp_fsf_open_unit_handler
2959  *
2960  * purpose:     is called for finished Open LUN command
2961  *
2962  * returns:
2963  */
2964 static int
2965 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2966 {
2967         int retval = -EINVAL;
2968         struct zfcp_adapter *adapter;
2969         struct zfcp_unit *unit;
2970         struct fsf_qtcb_header *header;
2971         struct fsf_qtcb_bottom_support *bottom;
2972         struct fsf_queue_designator *queue_designator;
2973         u16 subtable, rule, counter;
2974         int exclusive, readwrite;
2975
2976         unit = (struct zfcp_unit *) fsf_req->data;
2977
2978         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2979                 /* don't change unit status in our bookkeeping */
2980                 goto skip_fsfstatus;
2981         }
2982
2983         adapter = fsf_req->adapter;
2984         header = &fsf_req->qtcb->header;
2985         bottom = &fsf_req->qtcb->bottom.support;
2986         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
2987
2988         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2989                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
2990                           ZFCP_STATUS_UNIT_SHARED |
2991                           ZFCP_STATUS_UNIT_READONLY,
2992                           &unit->status);
2993
2994         /* evaluate FSF status in QTCB */
2995         switch (header->fsf_status) {
2996
2997         case FSF_PORT_HANDLE_NOT_VALID:
2998                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
2999                               "for port 0x%016Lx on adapter %s invalid "
3000                               "This may happen occasionally\n",
3001                               unit->port->handle,
3002                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3003                 ZFCP_LOG_DEBUG("status qualifier:\n");
3004                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3005                               (char *) &header->fsf_status_qual,
3006                               sizeof (union fsf_status_qual));
3007                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, fsf_req);
3008                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3009                 break;
3010
3011         case FSF_LUN_ALREADY_OPEN:
3012                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3013                                 "remote port 0x%016Lx on adapter %s twice.\n",
3014                                 unit->fcp_lun,
3015                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3016                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3017                 break;
3018
3019         case FSF_ACCESS_DENIED:
3020                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3021                                 "remote port 0x%016Lx on adapter %s\n",
3022                                 unit->fcp_lun, unit->port->wwpn,
3023                                 zfcp_get_busid_by_unit(unit));
3024                 for (counter = 0; counter < 2; counter++) {
3025                         subtable = header->fsf_status_qual.halfword[counter * 2];
3026                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3027                         switch (subtable) {
3028                         case FSF_SQ_CFDC_SUBTABLE_OS:
3029                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3030                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3031                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3032                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3033                                         zfcp_act_subtable_type[subtable], rule);
3034                                 break;
3035                         }
3036                 }
3037                 zfcp_erp_unit_access_denied(unit, 59, fsf_req);
3038                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3039                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3040                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3041                 break;
3042
3043         case FSF_PORT_BOXED:
3044                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3045                                "needs to be reopened\n",
3046                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3047                 zfcp_erp_port_boxed(unit->port, 51, fsf_req);
3048                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3049                         ZFCP_STATUS_FSFREQ_RETRY;
3050                 break;
3051
3052         case FSF_LUN_SHARING_VIOLATION:
3053                 if (header->fsf_status_qual.word[0] != 0) {
3054                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3055                                         "with WWPN 0x%Lx "
3056                                         "connected to the adapter %s "
3057                                         "is already in use in LPAR%d, CSS%d\n",
3058                                         unit->fcp_lun,
3059                                         unit->port->wwpn,
3060                                         zfcp_get_busid_by_unit(unit),
3061                                         queue_designator->hla,
3062                                         queue_designator->cssid);
3063                 } else {
3064                         subtable = header->fsf_status_qual.halfword[4];
3065                         rule = header->fsf_status_qual.halfword[5];
3066                         switch (subtable) {
3067                         case FSF_SQ_CFDC_SUBTABLE_OS:
3068                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3069                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3070                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3071                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3072                                                 "remote port with WWPN 0x%Lx "
3073                                                 "connected to the adapter %s "
3074                                                 "is denied (%s rule %d)\n",
3075                                                 unit->fcp_lun,
3076                                                 unit->port->wwpn,
3077                                                 zfcp_get_busid_by_unit(unit),
3078                                                 zfcp_act_subtable_type[subtable],
3079                                                 rule);
3080                                 break;
3081                         }
3082                 }
3083                 ZFCP_LOG_DEBUG("status qualifier:\n");
3084                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3085                               (char *) &header->fsf_status_qual,
3086                               sizeof (union fsf_status_qual));
3087                 zfcp_erp_unit_access_denied(unit, 60, fsf_req);
3088                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3089                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3090                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3091                 break;
3092
3093         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3094                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3095                               "There is no handle (temporary port identifier) "
3096                               "available for unit 0x%016Lx on port 0x%016Lx "
3097                               "on adapter %s\n",
3098                               unit->fcp_lun,
3099                               unit->port->wwpn,
3100                               zfcp_get_busid_by_unit(unit));
3101                 zfcp_erp_unit_failed(unit, 34, fsf_req);
3102                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3103                 break;
3104
3105         case FSF_ADAPTER_STATUS_AVAILABLE:
3106                 switch (header->fsf_status_qual.word[0]) {
3107                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3108                         /* Re-establish link to port */
3109                         zfcp_test_link(unit->port);
3110                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3111                         break;
3112                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3113                         /* ERP strategy will escalate */
3114                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3115                         break;
3116                 default:
3117                         ZFCP_LOG_NORMAL
3118                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3119                              header->fsf_status_qual.word[0]);
3120                 }
3121                 break;
3122
3123         case FSF_INVALID_COMMAND_OPTION:
3124                 ZFCP_LOG_NORMAL(
3125                         "Invalid option 0x%x has been specified "
3126                         "in QTCB bottom sent to the adapter %s\n",
3127                         bottom->option,
3128                         zfcp_get_busid_by_adapter(adapter));
3129                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3130                 retval = -EINVAL;
3131                 break;
3132
3133         case FSF_GOOD:
3134                 /* save LUN handle assigned by FSF */
3135                 unit->handle = header->lun_handle;
3136                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3137                                "adapter %s opened, port handle 0x%x\n",
3138                                unit->fcp_lun,
3139                                unit->port->wwpn,
3140                                zfcp_get_busid_by_unit(unit),
3141                                unit->handle);
3142                 /* mark unit as open */
3143                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3144
3145                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
3146                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
3147                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
3148                         exclusive = (bottom->lun_access_info &
3149                                         FSF_UNIT_ACCESS_EXCLUSIVE);
3150                         readwrite = (bottom->lun_access_info &
3151                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
3152
3153                         if (!exclusive)
3154                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3155                                                 &unit->status);
3156
3157                         if (!readwrite) {
3158                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3159                                                 &unit->status);
3160                                 ZFCP_LOG_NORMAL("read-only access for unit "
3161                                                 "(adapter %s, wwpn=0x%016Lx, "
3162                                                 "fcp_lun=0x%016Lx)\n",
3163                                                 zfcp_get_busid_by_unit(unit),
3164                                                 unit->port->wwpn,
3165                                                 unit->fcp_lun);
3166                         }
3167
3168                         if (exclusive && !readwrite) {
3169                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3170                                                 "unit not supported\n");
3171                                 zfcp_erp_unit_failed(unit, 35, fsf_req);
3172                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3173                                 zfcp_erp_unit_shutdown(unit, 0, 80, fsf_req);
3174                         } else if (!exclusive && readwrite) {
3175                                 ZFCP_LOG_NORMAL("shared access of read-write "
3176                                                 "unit not supported\n");
3177                                 zfcp_erp_unit_failed(unit, 36, fsf_req);
3178                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3179                                 zfcp_erp_unit_shutdown(unit, 0, 81, fsf_req);
3180                         }
3181                 }
3182
3183                 retval = 0;
3184                 break;
3185
3186         default:
3187                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3188                                 "(debug info 0x%x)\n",
3189                                 header->fsf_status);
3190                 break;
3191         }
3192
3193  skip_fsfstatus:
3194         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3195         return retval;
3196 }
3197
3198 /*
3199  * function:    zfcp_fsf_close_unit
3200  *
3201  * purpose:
3202  *
3203  * returns:     address of fsf_req - request successfully initiated
3204  *              NULL -
3205  *
3206  * assumptions: This routine does not check whether the associated
3207  *              remote port/lun has already been opened. This should be
3208  *              done by calling routines. Otherwise some status
3209  *              may be presented by FSF
3210  */
3211 int
3212 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3213 {
3214         volatile struct qdio_buffer_element *sbale;
3215         struct zfcp_fsf_req *fsf_req;
3216         unsigned long lock_flags;
3217         int retval = 0;
3218
3219         /* setup new FSF request */
3220         retval = zfcp_fsf_req_create(erp_action->adapter,
3221                                      FSF_QTCB_CLOSE_LUN,
3222                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3223                                      erp_action->adapter->pool.fsf_req_erp,
3224                                      &lock_flags, &fsf_req);
3225         if (retval < 0) {
3226                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3227                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3228                               erp_action->unit->fcp_lun,
3229                               erp_action->port->wwpn,
3230                               zfcp_get_busid_by_adapter(erp_action->adapter));
3231                 goto out;
3232         }
3233
3234         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3235         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3236         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3237
3238         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
3239         fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3240         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3241         fsf_req->data = (unsigned long) erp_action->unit;
3242         fsf_req->erp_action = erp_action;
3243         erp_action->fsf_req = fsf_req;
3244
3245         zfcp_erp_start_timer(fsf_req);
3246         retval = zfcp_fsf_req_send(erp_action->fsf_req);
3247         if (retval) {
3248                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3249                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3250                               erp_action->unit->fcp_lun,
3251                               erp_action->port->wwpn,
3252                               zfcp_get_busid_by_adapter(erp_action->adapter));
3253                 zfcp_fsf_req_free(fsf_req);
3254                 erp_action->fsf_req = NULL;
3255                 goto out;
3256         }
3257
3258         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3259                        "port 0x%016Lx, unit 0x%016Lx)\n",
3260                        zfcp_get_busid_by_adapter(erp_action->adapter),
3261                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3262  out:
3263         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3264                                 lock_flags);
3265         return retval;
3266 }
3267
3268 /*
3269  * function:    zfcp_fsf_close_unit_handler
3270  *
3271  * purpose:     is called for finished Close LUN FSF command
3272  *
3273  * returns:
3274  */
3275 static int
3276 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3277 {
3278         int retval = -EINVAL;
3279         struct zfcp_unit *unit;
3280
3281         unit = (struct zfcp_unit *) fsf_req->data;
3282
3283         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3284                 /* don't change unit status in our bookkeeping */
3285                 goto skip_fsfstatus;
3286         }
3287
3288         /* evaluate FSF status in QTCB */
3289         switch (fsf_req->qtcb->header.fsf_status) {
3290
3291         case FSF_PORT_HANDLE_NOT_VALID:
3292                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3293                               "0x%016Lx on adapter %s invalid. This may "
3294                               "happen in rare circumstances\n",
3295                               unit->port->handle,
3296                               unit->port->wwpn,
3297                               zfcp_get_busid_by_unit(unit));
3298                 ZFCP_LOG_DEBUG("status qualifier:\n");
3299                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3300                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3301                               sizeof (union fsf_status_qual));
3302                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, fsf_req);
3303                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3304                 break;
3305
3306         case FSF_LUN_HANDLE_NOT_VALID:
3307                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3308                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3309                               "invalid. This may happen occasionally.\n",
3310                               unit->handle,
3311                               unit->fcp_lun,
3312                               unit->port->wwpn,
3313                               zfcp_get_busid_by_unit(unit));
3314                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3315                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3316                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3317                               sizeof (union fsf_status_qual));
3318                 zfcp_erp_port_reopen(unit->port, 0, 111, fsf_req);
3319                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3320                 break;
3321
3322         case FSF_PORT_BOXED:
3323                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3324                                "needs to be reopened\n",
3325                                unit->port->wwpn,
3326                                zfcp_get_busid_by_unit(unit));
3327                 zfcp_erp_port_boxed(unit->port, 52, fsf_req);
3328                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3329                         ZFCP_STATUS_FSFREQ_RETRY;
3330                 break;
3331
3332         case FSF_ADAPTER_STATUS_AVAILABLE:
3333                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3334                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3335                         /* re-establish link to port */
3336                         zfcp_test_link(unit->port);
3337                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3338                         break;
3339                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3340                         /* ERP strategy will escalate */
3341                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3342                         break;
3343                 default:
3344                         ZFCP_LOG_NORMAL
3345                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3346                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3347                         break;
3348                 }
3349                 break;
3350
3351         case FSF_GOOD:
3352                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3353                                "closed, port handle 0x%x\n",
3354                                unit->fcp_lun,
3355                                unit->port->wwpn,
3356                                zfcp_get_busid_by_unit(unit),
3357                                unit->handle);
3358                 /* mark unit as closed */
3359                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3360                 retval = 0;
3361                 break;
3362
3363         default:
3364                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3365                                 "(debug info 0x%x)\n",
3366                                 fsf_req->qtcb->header.fsf_status);
3367                 break;
3368         }
3369
3370  skip_fsfstatus:
3371         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3372         return retval;
3373 }
3374
3375 /**
3376  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3377  * @adapter: adapter where scsi command is issued
3378  * @unit: unit where command is sent to
3379  * @scsi_cmnd: scsi command to be sent
3380  * @timer: timer to be started when request is initiated
3381  * @req_flags: flags for fsf_request
3382  */
3383 int
3384 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3385                                struct zfcp_unit *unit,
3386                                struct scsi_cmnd * scsi_cmnd,
3387                                int use_timer, int req_flags)
3388 {
3389         struct zfcp_fsf_req *fsf_req = NULL;
3390         struct fcp_cmnd_iu *fcp_cmnd_iu;
3391         unsigned int sbtype;
3392         unsigned long lock_flags;
3393         int real_bytes = 0;
3394         int retval = 0;
3395         int mask;
3396
3397         /* setup new FSF request */
3398         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3399                                      adapter->pool.fsf_req_scsi,
3400                                      &lock_flags, &fsf_req);
3401         if (unlikely(retval < 0)) {
3402                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3403                                "for unit 0x%016Lx on port 0x%016Lx on "
3404                                "adapter %s\n",
3405                                unit->fcp_lun,
3406                                unit->port->wwpn,
3407                                zfcp_get_busid_by_adapter(adapter));
3408                 goto failed_req_create;
3409         }
3410
3411         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3412                         &unit->status))) {
3413                 retval = -EBUSY;
3414                 goto unit_blocked;
3415         }
3416
3417         zfcp_unit_get(unit);
3418         fsf_req->unit = unit;
3419
3420         /* associate FSF request with SCSI request (for look up on abort) */
3421         scsi_cmnd->host_scribble = (unsigned char *) fsf_req->req_id;
3422
3423         /* associate SCSI command with FSF request */
3424         fsf_req->data = (unsigned long) scsi_cmnd;
3425
3426         /* set handles of unit and its parent port in QTCB */
3427         fsf_req->qtcb->header.lun_handle = unit->handle;
3428         fsf_req->qtcb->header.port_handle = unit->port->handle;
3429
3430         /* FSF does not define the structure of the FCP_CMND IU */
3431         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3432             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3433
3434         /*
3435          * set depending on data direction:
3436          *      data direction bits in SBALE (SB Type)
3437          *      data direction bits in QTCB
3438          *      data direction bits in FCP_CMND IU
3439          */
3440         switch (scsi_cmnd->sc_data_direction) {
3441         case DMA_NONE:
3442                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3443                 /*
3444                  * FIXME(qdio):
3445                  * what is the correct type for commands
3446                  * without 'real' data buffers?
3447                  */
3448                 sbtype = SBAL_FLAGS0_TYPE_READ;
3449                 break;
3450         case DMA_FROM_DEVICE:
3451                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3452                 sbtype = SBAL_FLAGS0_TYPE_READ;
3453                 fcp_cmnd_iu->rddata = 1;
3454                 break;
3455         case DMA_TO_DEVICE:
3456                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3457                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3458                 fcp_cmnd_iu->wddata = 1;
3459                 break;
3460         case DMA_BIDIRECTIONAL:
3461         default:
3462                 /*
3463                  * dummy, catch this condition earlier
3464                  * in zfcp_scsi_queuecommand
3465                  */
3466                 goto failed_scsi_cmnd;
3467         }
3468
3469         /* set FC service class in QTCB (3 per default) */
3470         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3471
3472         /* set FCP_LUN in FCP_CMND IU in QTCB */
3473         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3474
3475         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3476
3477         /* set task attributes in FCP_CMND IU in QTCB */
3478         if (likely((scsi_cmnd->device->simple_tags) ||
3479                    (atomic_test_mask(mask, &unit->status))))
3480                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3481         else
3482                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3483
3484         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3485         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3486                 fcp_cmnd_iu->add_fcp_cdb_length
3487                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3488                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3489                                "additional FCP_CDB length is 0x%x "
3490                                "(shifted right 2 bits)\n",
3491                                scsi_cmnd->cmd_len,
3492                                fcp_cmnd_iu->add_fcp_cdb_length);
3493         }
3494         /*
3495          * copy SCSI CDB (including additional length, if any) to
3496          * FCP_CDB in FCP_CMND IU in QTCB
3497          */
3498         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3499
3500         /* FCP CMND IU length in QTCB */
3501         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3502                 sizeof (struct fcp_cmnd_iu) +
3503                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3504
3505         /* generate SBALEs from data buffer */
3506         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3507         if (unlikely(real_bytes < 0)) {
3508                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3509                         ZFCP_LOG_DEBUG(
3510                                 "Data did not fit into available buffer(s), "
3511                                "waiting for more...\n");
3512                         retval = -EIO;
3513                 } else {
3514                         ZFCP_LOG_NORMAL("error: No truncation implemented but "
3515                                         "required. Shutting down unit "
3516                                         "(adapter %s, port 0x%016Lx, "
3517                                         "unit 0x%016Lx)\n",
3518                                         zfcp_get_busid_by_unit(unit),
3519                                         unit->port->wwpn,
3520                                         unit->fcp_lun);
3521                         zfcp_erp_unit_shutdown(unit, 0, 131, fsf_req);
3522                         retval = -EINVAL;
3523                 }
3524                 goto no_fit;
3525         }
3526
3527         /* set length of FCP data length in FCP_CMND IU in QTCB */
3528         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3529
3530         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3531         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3532                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3533
3534         if (use_timer)
3535                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
3536
3537         retval = zfcp_fsf_req_send(fsf_req);
3538         if (unlikely(retval < 0)) {
3539                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3540                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3541                               zfcp_get_busid_by_adapter(adapter),
3542                               unit->port->wwpn,
3543                               unit->fcp_lun);
3544                 goto send_failed;
3545         }
3546
3547         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3548                        "port 0x%016Lx, unit 0x%016Lx)\n",
3549                        zfcp_get_busid_by_adapter(adapter),
3550                        unit->port->wwpn,
3551                        unit->fcp_lun);
3552         goto success;
3553
3554  send_failed:
3555  no_fit:
3556  failed_scsi_cmnd:
3557         zfcp_unit_put(unit);
3558  unit_blocked:
3559         zfcp_fsf_req_free(fsf_req);
3560         fsf_req = NULL;
3561         scsi_cmnd->host_scribble = NULL;
3562  success:
3563  failed_req_create:
3564         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3565         return retval;
3566 }
3567
3568 struct zfcp_fsf_req *
3569 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3570                                           struct zfcp_unit *unit,
3571                                           u8 tm_flags, int req_flags)
3572 {
3573         struct zfcp_fsf_req *fsf_req = NULL;
3574         int retval = 0;
3575         struct fcp_cmnd_iu *fcp_cmnd_iu;
3576         unsigned long lock_flags;
3577         volatile struct qdio_buffer_element *sbale;
3578
3579         /* setup new FSF request */
3580         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3581                                      adapter->pool.fsf_req_scsi,
3582                                      &lock_flags, &fsf_req);
3583         if (retval < 0) {
3584                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3585                               "management) request for adapter %s, port "
3586                               " 0x%016Lx, unit 0x%016Lx.\n",
3587                               zfcp_get_busid_by_adapter(adapter),
3588                               unit->port->wwpn, unit->fcp_lun);
3589                 goto out;
3590         }
3591
3592         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3593                         &unit->status)))
3594                 goto unit_blocked;
3595
3596         /*
3597          * Used to decide on proper handler in the return path,
3598          * could be either zfcp_fsf_send_fcp_command_task_handler or
3599          * zfcp_fsf_send_fcp_command_task_management_handler */
3600
3601         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3602
3603         /*
3604          * hold a pointer to the unit being target of this
3605          * task management request
3606          */
3607         fsf_req->data = (unsigned long) unit;
3608
3609         /* set FSF related fields in QTCB */
3610         fsf_req->qtcb->header.lun_handle = unit->handle;
3611         fsf_req->qtcb->header.port_handle = unit->port->handle;
3612         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3613         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3614         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3615                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3616
3617         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3618         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3619         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3620
3621         /* set FCP related fields in FCP_CMND IU in QTCB */
3622         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3623                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3624         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3625         fcp_cmnd_iu->task_management_flags = tm_flags;
3626
3627         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
3628         retval = zfcp_fsf_req_send(fsf_req);
3629         if (!retval)
3630                 goto out;
3631
3632  unit_blocked:
3633         zfcp_fsf_req_free(fsf_req);
3634         fsf_req = NULL;
3635
3636  out:
3637         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3638         return fsf_req;
3639 }
3640
3641 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
3642 {
3643         lat_rec->sum += lat;
3644         if (lat_rec->min > lat)
3645                 lat_rec->min = lat;
3646         if (lat_rec->max < lat)
3647                 lat_rec->max = lat;
3648 }
3649
3650 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *fsf_req)
3651 {
3652         struct fsf_qual_latency_info *lat_inf;
3653         struct latency_cont *lat;
3654         struct zfcp_unit *unit;
3655         unsigned long flags;
3656
3657         lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
3658         unit = fsf_req->unit;
3659
3660         switch (fsf_req->qtcb->bottom.io.data_direction) {
3661         case FSF_DATADIR_READ:
3662                 lat = &unit->latencies.read;
3663                 break;
3664         case FSF_DATADIR_WRITE:
3665                 lat = &unit->latencies.write;
3666                 break;
3667         case FSF_DATADIR_CMND:
3668                 lat = &unit->latencies.cmd;
3669                 break;
3670         default:
3671                 return;
3672         }
3673
3674         spin_lock_irqsave(&unit->latencies.lock, flags);
3675         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
3676         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
3677         lat->counter++;
3678         spin_unlock_irqrestore(&unit->latencies.lock, flags);
3679 }
3680
3681 /*
3682  * function:    zfcp_fsf_send_fcp_command_handler
3683  *
3684  * purpose:     is called for finished Send FCP Command
3685  *
3686  * returns:
3687  */
3688 static int
3689 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3690 {
3691         int retval = -EINVAL;
3692         struct zfcp_unit *unit;
3693         struct fsf_qtcb_header *header;
3694         u16 subtable, rule, counter;
3695
3696         header = &fsf_req->qtcb->header;
3697
3698         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3699                 unit = (struct zfcp_unit *) fsf_req->data;
3700         else
3701                 unit = fsf_req->unit;
3702
3703         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3704                 /* go directly to calls of special handlers */
3705                 goto skip_fsfstatus;
3706         }
3707
3708         /* evaluate FSF status in QTCB */
3709         switch (header->fsf_status) {
3710
3711         case FSF_PORT_HANDLE_NOT_VALID:
3712                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3713                               "0x%016Lx on adapter %s invalid\n",
3714                               unit->port->handle,
3715                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3716                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3717                               (char *) &header->fsf_status_qual,
3718                               sizeof (union fsf_status_qual));
3719                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, fsf_req);
3720                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3721                 break;
3722
3723         case FSF_LUN_HANDLE_NOT_VALID:
3724                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3725                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3726                               "invalid. This may happen occasionally.\n",
3727                               unit->handle,
3728                               unit->fcp_lun,
3729                               unit->port->wwpn,
3730                               zfcp_get_busid_by_unit(unit));
3731                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3732                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3733                               (char *) &header->fsf_status_qual,
3734                               sizeof (union fsf_status_qual));
3735                 zfcp_erp_port_reopen(unit->port, 0, 113, fsf_req);
3736                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3737                 break;
3738
3739         case FSF_HANDLE_MISMATCH:
3740                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3741                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3742                                 "unit 0x%016Lx)\n",
3743                                 unit->port->handle,
3744                                 zfcp_get_busid_by_unit(unit),
3745                                 unit->port->wwpn,
3746                                 unit->fcp_lun);
3747                 ZFCP_LOG_NORMAL("status qualifier:\n");
3748                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3749                               (char *) &header->fsf_status_qual,
3750                               sizeof (union fsf_status_qual));
3751                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 114, fsf_req);
3752                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3753                 break;
3754
3755         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3756                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
3757                               "class %d.\n",
3758                               zfcp_get_busid_by_unit(unit),
3759                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
3760                 /* stop operation for this adapter */
3761                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 132, fsf_req);
3762                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3763                 break;
3764
3765         case FSF_FCPLUN_NOT_VALID:
3766                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3767                                 "adapter %s does not have correct unit "
3768                                 "handle 0x%x\n",
3769                                 unit->fcp_lun,
3770                                 unit->port->wwpn,
3771                                 zfcp_get_busid_by_unit(unit),
3772                                 unit->handle);
3773                 ZFCP_LOG_DEBUG("status qualifier:\n");
3774                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3775                               (char *) &header->fsf_status_qual,
3776                               sizeof (union fsf_status_qual));
3777                 zfcp_erp_port_reopen(unit->port, 0, 115, fsf_req);
3778                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3779                 break;
3780
3781         case FSF_ACCESS_DENIED:
3782                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3783                                 "unit 0x%016Lx on port 0x%016Lx on "
3784                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3785                                 zfcp_get_busid_by_unit(unit));
3786                 for (counter = 0; counter < 2; counter++) {
3787                         subtable = header->fsf_status_qual.halfword[counter * 2];
3788                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3789                         switch (subtable) {
3790                         case FSF_SQ_CFDC_SUBTABLE_OS:
3791                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3792                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3793                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3794                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3795                                         zfcp_act_subtable_type[subtable], rule);
3796                                 break;
3797                         }
3798                 }
3799                 zfcp_erp_unit_access_denied(unit, 61, fsf_req);
3800                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3801                 break;
3802
3803         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3804                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3805                               "0x%016Lx on port 0x%016Lx on adapter %s "
3806                               "(debug info %d)\n",
3807                               unit->fcp_lun,
3808                               unit->port->wwpn,
3809                               zfcp_get_busid_by_unit(unit),
3810                               fsf_req->qtcb->bottom.io.data_direction);
3811                 /* stop operation for this adapter */
3812                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, fsf_req);
3813                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3814                 break;
3815
3816         case FSF_CMND_LENGTH_NOT_VALID:
3817                 ZFCP_LOG_NORMAL
3818                     ("bug: An invalid control-data-block length field "
3819                      "was found in a command for unit 0x%016Lx on port "
3820                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3821                      unit->fcp_lun, unit->port->wwpn,
3822                      zfcp_get_busid_by_unit(unit),
3823                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3824                 /* stop operation for this adapter */
3825                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, fsf_req);
3826                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3827                 break;
3828
3829         case FSF_PORT_BOXED:
3830                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3831                                "needs to be reopened\n",
3832                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3833                 zfcp_erp_port_boxed(unit->port, 53, fsf_req);
3834                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3835                         ZFCP_STATUS_FSFREQ_RETRY;
3836                 break;
3837
3838         case FSF_LUN_BOXED:
3839                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3840                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3841                                 zfcp_get_busid_by_unit(unit),
3842                                 unit->port->wwpn, unit->fcp_lun);
3843                 zfcp_erp_unit_boxed(unit, 54, fsf_req);
3844                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3845                         | ZFCP_STATUS_FSFREQ_RETRY;
3846                 break;
3847
3848         case FSF_ADAPTER_STATUS_AVAILABLE:
3849                 switch (header->fsf_status_qual.word[0]) {
3850                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3851                         /* re-establish link to port */
3852                         zfcp_test_link(unit->port);
3853                         break;
3854                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3855                         /* FIXME(hw) need proper specs for proper action */
3856                         /* let scsi stack deal with retries and escalation */
3857                         break;
3858                 default:
3859                         ZFCP_LOG_NORMAL
3860                             ("Unknown status qualifier 0x%x arrived.\n",
3861                              header->fsf_status_qual.word[0]);
3862                         break;
3863                 }
3864                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3865                 break;
3866
3867         case FSF_GOOD:
3868                 break;
3869
3870         case FSF_FCP_RSP_AVAILABLE:
3871                 break;
3872         }
3873
3874  skip_fsfstatus:
3875         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3876                 retval =
3877                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3878         } else {
3879                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3880                 fsf_req->unit = NULL;
3881                 zfcp_unit_put(unit);
3882         }
3883         return retval;
3884 }
3885
3886 /*
3887  * function:    zfcp_fsf_send_fcp_command_task_handler
3888  *
3889  * purpose:     evaluates FCP_RSP IU
3890  *
3891  * returns:
3892  */
3893 static int
3894 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3895 {
3896         int retval = 0;
3897         struct scsi_cmnd *scpnt;
3898         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3899             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3900         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3901             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3902         u32 sns_len;
3903         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3904         unsigned long flags;
3905         struct zfcp_unit *unit = fsf_req->unit;
3906
3907         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3908         scpnt = (struct scsi_cmnd *) fsf_req->data;
3909         if (unlikely(!scpnt)) {
3910                 ZFCP_LOG_DEBUG
3911                     ("Command with fsf_req %p is not associated to "
3912                      "a scsi command anymore. Aborted?\n", fsf_req);
3913                 goto out;
3914         }
3915         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3916                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3917                  *        DID_SOFT_ERROR by retrying the request for devices
3918                  *        that allow retries.
3919                  */
3920                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3921                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3922                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3923                 goto skip_fsfstatus;
3924         }
3925
3926         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3927                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3928                 set_host_byte(&scpnt->result, DID_ERROR);
3929                 goto skip_fsfstatus;
3930         }
3931
3932         /* set message byte of result in SCSI command */
3933         scpnt->result |= COMMAND_COMPLETE << 8;
3934
3935         /*
3936          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
3937          * of result in SCSI command
3938          */
3939         scpnt->result |= fcp_rsp_iu->scsi_status;
3940         if (unlikely(fcp_rsp_iu->scsi_status)) {
3941                 /* DEBUG */
3942                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
3943                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3944                               scpnt->cmnd, scpnt->cmd_len);
3945                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
3946                                 fcp_rsp_iu->scsi_status);
3947                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3948                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
3949                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3950                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
3951                               fcp_rsp_iu->fcp_sns_len);
3952         }
3953
3954         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
3955                 zfcp_fsf_req_latency(fsf_req);
3956
3957         /* check FCP_RSP_INFO */
3958         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
3959                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
3960                 switch (fcp_rsp_info[3]) {
3961                 case RSP_CODE_GOOD:
3962                         /* ok, continue */
3963                         ZFCP_LOG_TRACE("no failure or Task Management "
3964                                        "Function complete\n");
3965                         set_host_byte(&scpnt->result, DID_OK);
3966                         break;
3967                 case RSP_CODE_LENGTH_MISMATCH:
3968                         /* hardware bug */
3969                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3970                                         "that the fibrechannel protocol data "
3971                                         "length differs from the burst length. "
3972                                         "The problem occured on unit 0x%016Lx "
3973                                         "on port 0x%016Lx on adapter %s",
3974                                         unit->fcp_lun,
3975                                         unit->port->wwpn,
3976                                         zfcp_get_busid_by_unit(unit));
3977                         /* dump SCSI CDB as prepared by zfcp */
3978                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3979                                       (char *) &fsf_req->qtcb->
3980                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3981                         set_host_byte(&scpnt->result, DID_ERROR);
3982                         goto skip_fsfstatus;
3983                 case RSP_CODE_FIELD_INVALID:
3984                         /* driver or hardware bug */
3985                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3986                                         "that the fibrechannel protocol data "
3987                                         "fields were incorrectly set up. "
3988                                         "The problem occured on the unit "
3989                                         "0x%016Lx on port 0x%016Lx on "
3990                                         "adapter %s",
3991                                         unit->fcp_lun,
3992                                         unit->port->wwpn,
3993                                         zfcp_get_busid_by_unit(unit));
3994                         /* dump SCSI CDB as prepared by zfcp */
3995                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3996                                       (char *) &fsf_req->qtcb->
3997                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3998                         set_host_byte(&scpnt->result, DID_ERROR);
3999                         goto skip_fsfstatus;
4000                 case RSP_CODE_RO_MISMATCH:
4001                         /* hardware bug */
4002                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
4003                                         "that conflicting  values for the "
4004                                         "fibrechannel payload offset from the "
4005                                         "header were found. "
4006                                         "The problem occured on unit 0x%016Lx "
4007                                         "on port 0x%016Lx on adapter %s.\n",
4008                                         unit->fcp_lun,
4009                                         unit->port->wwpn,
4010                                         zfcp_get_busid_by_unit(unit));
4011                         /* dump SCSI CDB as prepared by zfcp */
4012                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4013                                       (char *) &fsf_req->qtcb->
4014                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4015                         set_host_byte(&scpnt->result, DID_ERROR);
4016                         goto skip_fsfstatus;
4017                 default:
4018                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4019                                         "code was detected for a command. "
4020                                         "The problem occured on the unit "
4021                                         "0x%016Lx on port 0x%016Lx on "
4022                                         "adapter %s (debug info 0x%x)\n",
4023                                         unit->fcp_lun,
4024                                         unit->port->wwpn,
4025                                         zfcp_get_busid_by_unit(unit),
4026                                         fcp_rsp_info[3]);
4027                         /* dump SCSI CDB as prepared by zfcp */
4028                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4029                                       (char *) &fsf_req->qtcb->
4030                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4031                         set_host_byte(&scpnt->result, DID_ERROR);
4032                         goto skip_fsfstatus;
4033                 }
4034         }
4035
4036         /* check for sense data */
4037         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4038                 sns_len = FSF_FCP_RSP_SIZE -
4039                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4040                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4041                                sns_len);
4042                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4043                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4044                                SCSI_SENSE_BUFFERSIZE);
4045                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4046                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4047                                scpnt->result);
4048                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4049                               scpnt->cmnd, scpnt->cmd_len);
4050
4051                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4052                                fcp_rsp_iu->fcp_sns_len);
4053                 memcpy(scpnt->sense_buffer,
4054                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4055                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4056                               (void *)scpnt->sense_buffer, sns_len);
4057         }
4058
4059         /* check for overrun */
4060         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4061                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4062                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4063                               "The response data length is "
4064                               "%d, the original length was %d.\n",
4065                               unit->fcp_lun,
4066                               unit->port->wwpn,
4067                               zfcp_get_busid_by_unit(unit),
4068                               fcp_rsp_iu->fcp_resid,
4069                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4070         }
4071
4072         /* check for underrun */
4073         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4074                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4075                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4076                               "The response data length is "
4077                               "%d, the original length was %d.\n",
4078                               unit->fcp_lun,
4079                               unit->port->wwpn,
4080                               zfcp_get_busid_by_unit(unit),
4081                               fcp_rsp_iu->fcp_resid,
4082                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4083
4084                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
4085                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
4086                     scpnt->underflow)
4087                         set_host_byte(&scpnt->result, DID_ERROR);
4088         }
4089
4090  skip_fsfstatus:
4091         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4092
4093         if (scpnt->result != 0)
4094                 zfcp_scsi_dbf_event_result("erro", 3, fsf_req->adapter, scpnt, fsf_req);
4095         else if (scpnt->retries > 0)
4096                 zfcp_scsi_dbf_event_result("retr", 4, fsf_req->adapter, scpnt, fsf_req);
4097         else
4098                 zfcp_scsi_dbf_event_result("norm", 6, fsf_req->adapter, scpnt, fsf_req);
4099
4100         /* cleanup pointer (need this especially for abort) */
4101         scpnt->host_scribble = NULL;
4102
4103         /* always call back */
4104         (scpnt->scsi_done) (scpnt);
4105
4106         /*
4107          * We must hold this lock until scsi_done has been called.
4108          * Otherwise we may call scsi_done after abort regarding this
4109          * command has completed.
4110          * Note: scsi_done must not block!
4111          */
4112  out:
4113         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4114         return retval;
4115 }
4116
4117 /*
4118  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4119  *
4120  * purpose:     evaluates FCP_RSP IU
4121  *
4122  * returns:
4123  */
4124 static int
4125 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4126 {
4127         int retval = 0;
4128         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4129             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4130         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4131         struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
4132
4133         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4134                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4135                 goto skip_fsfstatus;
4136         }
4137
4138         /* check FCP_RSP_INFO */
4139         switch (fcp_rsp_info[3]) {
4140         case RSP_CODE_GOOD:
4141                 /* ok, continue */
4142                 ZFCP_LOG_DEBUG("no failure or Task Management "
4143                                "Function complete\n");
4144                 break;
4145         case RSP_CODE_TASKMAN_UNSUPP:
4146                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4147                                 "is not supported on the target device "
4148                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4149                                 unit->fcp_lun,
4150                                 unit->port->wwpn,
4151                                 zfcp_get_busid_by_unit(unit));
4152                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4153                 break;
4154         case RSP_CODE_TASKMAN_FAILED:
4155                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4156                                 "failed to complete successfully. "
4157                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4158                                 unit->fcp_lun,
4159                                 unit->port->wwpn,
4160                                 zfcp_get_busid_by_unit(unit));
4161                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4162                 break;
4163         default:
4164                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4165                                 "code was detected for a command. "
4166                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4167                                 "(debug info 0x%x)\n",
4168                                 unit->fcp_lun,
4169                                 unit->port->wwpn,
4170                                 zfcp_get_busid_by_unit(unit),
4171                                 fcp_rsp_info[3]);
4172                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4173         }
4174
4175       skip_fsfstatus:
4176         return retval;
4177 }
4178
4179
4180 /*
4181  * function:    zfcp_fsf_control_file
4182  *
4183  * purpose:     Initiator of the control file upload/download FSF requests
4184  *
4185  * returns:     0           - FSF request is successfuly created and queued
4186  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4187  *              -EINVAL     - Invalid direction specified
4188  *              -ENOMEM     - Insufficient memory
4189  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4190  */
4191 int
4192 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4193                       struct zfcp_fsf_req **fsf_req_ptr,
4194                       u32 fsf_command,
4195                       u32 option,
4196                       struct zfcp_sg_list *sg_list)
4197 {
4198         struct zfcp_fsf_req *fsf_req;
4199         struct fsf_qtcb_bottom_support *bottom;
4200         volatile struct qdio_buffer_element *sbale;
4201         unsigned long lock_flags;
4202         int req_flags = 0;
4203         int direction;
4204         int retval = 0;
4205
4206         if (!(adapter->adapter_features & FSF_FEATURE_CFDC)) {
4207                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4208                               zfcp_get_busid_by_adapter(adapter));
4209                 retval = -EOPNOTSUPP;
4210                 goto out;
4211         }
4212
4213         switch (fsf_command) {
4214
4215         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4216                 direction = SBAL_FLAGS0_TYPE_WRITE;
4217                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4218                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4219                         req_flags = ZFCP_WAIT_FOR_SBAL;
4220                 break;
4221
4222         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4223                 direction = SBAL_FLAGS0_TYPE_READ;
4224                 break;
4225
4226         default:
4227                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4228                 retval = -EINVAL;
4229                 goto out;
4230         }
4231
4232         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4233                                      NULL, &lock_flags, &fsf_req);
4234         if (retval < 0) {
4235                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4236                               "adapter %s\n",
4237                         zfcp_get_busid_by_adapter(adapter));
4238                 retval = -EPERM;
4239                 goto unlock_queue_lock;
4240         }
4241
4242         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4243         sbale[0].flags |= direction;
4244
4245         bottom = &fsf_req->qtcb->bottom.support;
4246         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4247         bottom->option = option;
4248
4249         if (sg_list->count > 0) {
4250                 int bytes;
4251
4252                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4253                                                 sg_list->sg, sg_list->count,
4254                                                 ZFCP_MAX_SBALS_PER_REQ);
4255                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4256                         ZFCP_LOG_INFO(
4257                                 "error: Could not create sufficient number of "
4258                                 "SBALS for an FSF request to the adapter %s\n",
4259                                 zfcp_get_busid_by_adapter(adapter));
4260                         retval = -ENOMEM;
4261                         goto free_fsf_req;
4262                 }
4263         } else
4264                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4265
4266         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
4267         retval = zfcp_fsf_req_send(fsf_req);
4268         if (retval < 0) {
4269                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4270                               "(adapter %s)\n",
4271                               zfcp_get_busid_by_adapter(adapter));
4272                 retval = -EPERM;
4273                 goto free_fsf_req;
4274         }
4275         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4276
4277         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4278                         "adapter %s\n",
4279                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4280                         "download" : "upload",
4281                         zfcp_get_busid_by_adapter(adapter));
4282
4283         wait_event(fsf_req->completion_wq,
4284                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4285
4286         *fsf_req_ptr = fsf_req;
4287         goto out;
4288
4289  free_fsf_req:
4290         zfcp_fsf_req_free(fsf_req);
4291  unlock_queue_lock:
4292         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4293  out:
4294         return retval;
4295 }
4296
4297
4298 /*
4299  * function:    zfcp_fsf_control_file_handler
4300  *
4301  * purpose:     Handler of the control file upload/download FSF requests
4302  *
4303  * returns:     0       - FSF request successfuly processed
4304  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4305  *              -EACCES - There is no permission to execute an operation
4306  *              -EPERM  - The control file is not in a right format
4307  *              -EIO    - There is a problem with the FCP adapter
4308  *              -EINVAL - Invalid operation
4309  *              -EFAULT - User space memory I/O operation fault
4310  */
4311 static int
4312 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4313 {
4314         struct zfcp_adapter *adapter = fsf_req->adapter;
4315         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4316         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4317         int retval = 0;
4318
4319         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4320                 retval = -EINVAL;
4321                 goto skip_fsfstatus;
4322         }
4323
4324         switch (header->fsf_status) {
4325
4326         case FSF_GOOD:
4327                 ZFCP_LOG_NORMAL(
4328                         "The FSF request has been successfully completed "
4329                         "on the adapter %s\n",
4330                         zfcp_get_busid_by_adapter(adapter));
4331                 break;
4332
4333         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4334                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4335                         switch (header->fsf_status_qual.word[0]) {
4336
4337                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4338                                 ZFCP_LOG_NORMAL(
4339                                         "CFDC on the adapter %s has being "
4340                                         "hardened on primary and secondary SE\n",
4341                                         zfcp_get_busid_by_adapter(adapter));
4342                                 break;
4343
4344                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4345                                 ZFCP_LOG_NORMAL(
4346                                         "CFDC of the adapter %s could not "
4347                                         "be saved on the SE\n",
4348                                         zfcp_get_busid_by_adapter(adapter));
4349                                 break;
4350
4351                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4352                                 ZFCP_LOG_NORMAL(
4353                                         "CFDC of the adapter %s could not "
4354                                         "be copied to the secondary SE\n",
4355                                         zfcp_get_busid_by_adapter(adapter));
4356                                 break;
4357
4358                         default:
4359                                 ZFCP_LOG_NORMAL(
4360                                         "CFDC could not be hardened "
4361                                         "on the adapter %s\n",
4362                                         zfcp_get_busid_by_adapter(adapter));
4363                         }
4364                 }
4365                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4366                 retval = -EAGAIN;
4367                 break;
4368
4369         case FSF_AUTHORIZATION_FAILURE:
4370                 ZFCP_LOG_NORMAL(
4371                         "Adapter %s does not accept privileged commands\n",
4372                         zfcp_get_busid_by_adapter(adapter));
4373                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4374                 retval = -EACCES;
4375                 break;
4376
4377         case FSF_CFDC_ERROR_DETECTED:
4378                 ZFCP_LOG_NORMAL(
4379                         "Error at position %d in the CFDC, "
4380                         "CFDC is discarded by the adapter %s\n",
4381                         header->fsf_status_qual.word[0],
4382                         zfcp_get_busid_by_adapter(adapter));
4383                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4384                 retval = -EPERM;
4385                 break;
4386
4387         case FSF_CONTROL_FILE_UPDATE_ERROR:
4388                 ZFCP_LOG_NORMAL(
4389                         "Adapter %s cannot harden the control file, "
4390                         "file is discarded\n",
4391                         zfcp_get_busid_by_adapter(adapter));
4392                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4393                 retval = -EIO;
4394                 break;
4395
4396         case FSF_CONTROL_FILE_TOO_LARGE:
4397                 ZFCP_LOG_NORMAL(
4398                         "Control file is too large, file is discarded "
4399                         "by the adapter %s\n",
4400                         zfcp_get_busid_by_adapter(adapter));
4401                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4402                 retval = -EIO;
4403                 break;
4404
4405         case FSF_ACCESS_CONFLICT_DETECTED:
4406                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4407                         ZFCP_LOG_NORMAL(
4408                                 "CFDC has been discarded by the adapter %s, "
4409                                 "because activation would impact "
4410                                 "%d active connection(s)\n",
4411                                 zfcp_get_busid_by_adapter(adapter),
4412                                 header->fsf_status_qual.word[0]);
4413                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4414                 retval = -EIO;
4415                 break;
4416
4417         case FSF_CONFLICTS_OVERRULED:
4418                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4419                         ZFCP_LOG_NORMAL(
4420                                 "CFDC has been activated on the adapter %s, "
4421                                 "but activation has impacted "
4422                                 "%d active connection(s)\n",
4423                                 zfcp_get_busid_by_adapter(adapter),
4424                                 header->fsf_status_qual.word[0]);
4425                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4426                 retval = -EIO;
4427                 break;
4428
4429         case FSF_UNKNOWN_OP_SUBTYPE:
4430                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4431                                 "op_subtype=0x%x)\n",
4432                                 zfcp_get_busid_by_adapter(adapter),
4433                                 bottom->operation_subtype);
4434                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4435                 retval = -EINVAL;
4436                 break;
4437
4438         case FSF_INVALID_COMMAND_OPTION:
4439                 ZFCP_LOG_NORMAL(
4440                         "Invalid option 0x%x has been specified "
4441                         "in QTCB bottom sent to the adapter %s\n",
4442                         bottom->option,
4443                         zfcp_get_busid_by_adapter(adapter));
4444                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4445                 retval = -EINVAL;
4446                 break;
4447
4448         default:
4449                 ZFCP_LOG_NORMAL(
4450                         "bug: An unknown/unexpected FSF status 0x%08x "
4451                         "was presented on the adapter %s\n",
4452                         header->fsf_status,
4453                         zfcp_get_busid_by_adapter(adapter));
4454                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4455                 retval = -EINVAL;
4456                 break;
4457         }
4458
4459 skip_fsfstatus:
4460         return retval;
4461 }
4462
4463 static inline int
4464 zfcp_fsf_req_sbal_check(unsigned long *flags,
4465                         struct zfcp_qdio_queue *queue, int needed)
4466 {
4467         write_lock_irqsave(&queue->queue_lock, *flags);
4468         if (likely(atomic_read(&queue->free_count) >= needed))
4469                 return 1;
4470         write_unlock_irqrestore(&queue->queue_lock, *flags);
4471         return 0;
4472 }
4473
4474 /*
4475  * set qtcb pointer in fsf_req and initialize QTCB
4476  */
4477 static void
4478 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
4479 {
4480         if (likely(fsf_req->qtcb != NULL)) {
4481                 fsf_req->qtcb->prefix.req_seq_no =
4482                         fsf_req->adapter->fsf_req_seq_no;
4483                 fsf_req->qtcb->prefix.req_id = fsf_req->req_id;
4484                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4485                 fsf_req->qtcb->prefix.qtcb_type =
4486                         fsf_qtcb_type[fsf_req->fsf_command];
4487                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4488                 fsf_req->qtcb->header.req_handle = fsf_req->req_id;
4489                 fsf_req->qtcb->header.fsf_command = fsf_req->fsf_command;
4490         }
4491 }
4492
4493 /**
4494  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4495  * @adapter: adapter for which request queue is examined
4496  * @req_flags: flags indicating whether to wait for needed SBAL or not
4497  * @lock_flags: lock_flags if queue_lock is taken
4498  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4499  * Locks: lock adapter->request_queue->queue_lock on success
4500  */
4501 static int
4502 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4503                       unsigned long *lock_flags)
4504 {
4505         long ret;
4506         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4507
4508         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4509                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4510                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4511                                                        ZFCP_SBAL_TIMEOUT);
4512                 if (ret < 0)
4513                         return ret;
4514                 if (!ret)
4515                         return -EIO;
4516         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4517                 return -EIO;
4518
4519         return 0;
4520 }
4521
4522 /*
4523  * function:    zfcp_fsf_req_create
4524  *
4525  * purpose:     create an FSF request at the specified adapter and
4526  *              setup common fields
4527  *
4528  * returns:     -ENOMEM if there was insufficient memory for a request
4529  *              -EIO if no qdio buffers could be allocate to the request
4530  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4531  *              0 in success
4532  *
4533  * note:        The created request is returned by reference.
4534  *
4535  * locks:       lock of concerned request queue must not be held,
4536  *              but is held on completion (write, irqsave)
4537  */
4538 int
4539 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4540                     mempool_t *pool, unsigned long *lock_flags,
4541                     struct zfcp_fsf_req **fsf_req_p)
4542 {
4543         volatile struct qdio_buffer_element *sbale;
4544         struct zfcp_fsf_req *fsf_req = NULL;
4545         int ret = 0;
4546         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4547
4548         /* allocate new FSF request */
4549         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4550         if (unlikely(NULL == fsf_req)) {
4551                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into "
4552                                "the outbound (send) queue.\n");
4553                 ret = -ENOMEM;
4554                 goto failed_fsf_req;
4555         }
4556
4557         fsf_req->adapter = adapter;
4558         fsf_req->fsf_command = fsf_cmd;
4559         INIT_LIST_HEAD(&fsf_req->list);
4560         init_timer(&fsf_req->timer);
4561
4562         /* initialize waitqueue which may be used to wait on
4563            this request completion */
4564         init_waitqueue_head(&fsf_req->completion_wq);
4565
4566         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4567         if (ret < 0)
4568                 goto failed_sbals;
4569
4570         /* this is serialized (we are holding req_queue-lock of adapter) */
4571         if (adapter->req_no == 0)
4572                 adapter->req_no++;
4573         fsf_req->req_id = adapter->req_no++;
4574
4575         zfcp_fsf_req_qtcb_init(fsf_req);
4576
4577         /*
4578          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4579          * if it is not set (see also *_open_qdio and *_close_qdio).
4580          */
4581
4582         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4583                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4584                 ret = -EIO;
4585                 goto failed_sbals;
4586         }
4587
4588         if (fsf_req->qtcb) {
4589                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4590                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4591         }
4592         fsf_req->sbal_number = 1;
4593         fsf_req->sbal_first = req_queue->free_index;
4594         fsf_req->sbal_curr = req_queue->free_index;
4595         fsf_req->sbale_curr = 1;
4596
4597         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4598                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4599         }
4600
4601         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4602
4603         /* setup common SBALE fields */
4604         sbale[0].addr = (void *) fsf_req->req_id;
4605         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4606         if (likely(fsf_req->qtcb != NULL)) {
4607                 sbale[1].addr = (void *) fsf_req->qtcb;
4608                 sbale[1].length = sizeof(struct fsf_qtcb);
4609         }
4610
4611         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4612                        fsf_req->sbal_number, fsf_req->sbal_first);
4613
4614         goto success;
4615
4616  failed_sbals:
4617 /* dequeue new FSF request previously enqueued */
4618         zfcp_fsf_req_free(fsf_req);
4619         fsf_req = NULL;
4620
4621  failed_fsf_req:
4622         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4623  success:
4624         *fsf_req_p = fsf_req;
4625         return ret;
4626 }
4627
4628 /*
4629  * function:    zfcp_fsf_req_send
4630  *
4631  * purpose:     start transfer of FSF request via QDIO
4632  *
4633  * returns:     0 - request transfer succesfully started
4634  *              !0 - start of request transfer failed
4635  */
4636 static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
4637 {
4638         struct zfcp_adapter *adapter;
4639         struct zfcp_qdio_queue *req_queue;
4640         volatile struct qdio_buffer_element *sbale;
4641         int inc_seq_no;
4642         int new_distance_from_int;
4643         int retval = 0;
4644
4645         adapter = fsf_req->adapter;
4646         req_queue = &adapter->request_queue,
4647
4648
4649         /* FIXME(debug): remove it later */
4650         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4651         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4652         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4653         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4654                       sbale[1].length);
4655
4656         /* put allocated FSF request into hash table */
4657         spin_lock(&adapter->req_list_lock);
4658         zfcp_reqlist_add(adapter, fsf_req);
4659         spin_unlock(&adapter->req_list_lock);
4660
4661         inc_seq_no = (fsf_req->qtcb != NULL);
4662
4663         ZFCP_LOG_TRACE("request queue of adapter %s: "
4664                        "next free SBAL is %i, %i free SBALs\n",
4665                        zfcp_get_busid_by_adapter(adapter),
4666                        req_queue->free_index,
4667                        atomic_read(&req_queue->free_count));
4668
4669         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4670                        "index_in_queue=%i, count=%i, buffers=%p\n",
4671                        zfcp_get_busid_by_adapter(adapter),
4672                        QDIO_FLAG_SYNC_OUTPUT,
4673                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4674                        &req_queue->buffer[fsf_req->sbal_first]);
4675
4676         /*
4677          * adjust the number of free SBALs in request queue as well as
4678          * position of first one
4679          */
4680         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4681         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4682         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4683         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4684         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4685
4686         fsf_req->issued = get_clock();
4687
4688         retval = do_QDIO(adapter->ccw_device,
4689                          QDIO_FLAG_SYNC_OUTPUT,
4690                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4691
4692         if (unlikely(retval)) {
4693                 /* Queues are down..... */
4694                 retval = -EIO;
4695                 del_timer(&fsf_req->timer);
4696                 spin_lock(&adapter->req_list_lock);
4697                 zfcp_reqlist_remove(adapter, fsf_req);
4698                 spin_unlock(&adapter->req_list_lock);
4699                 /* undo changes in request queue made for this request */
4700                 zfcp_qdio_zero_sbals(req_queue->buffer,
4701                                      fsf_req->sbal_first, fsf_req->sbal_number);
4702                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4703                 req_queue->free_index -= fsf_req->sbal_number;
4704                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4705                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4706                 zfcp_erp_adapter_reopen(adapter, 0, 116, fsf_req);
4707         } else {
4708                 req_queue->distance_from_int = new_distance_from_int;
4709                 /*
4710                  * increase FSF sequence counter -
4711                  * this must only be done for request successfully enqueued to
4712                  * QDIO this rejected requests may be cleaned up by calling
4713                  * routines  resulting in missing sequence counter values
4714                  * otherwise,
4715                  */
4716
4717                 /* Don't increase for unsolicited status */
4718                 if (inc_seq_no)
4719                         adapter->fsf_req_seq_no++;
4720
4721                 /* count FSF requests pending */
4722                 atomic_inc(&adapter->reqs_active);
4723         }
4724         return retval;
4725 }
4726
4727 #undef ZFCP_LOG_AREA