git.oblomov.eu Git - linux-2.6/blob - 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_adapter *,
  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         /* log additional information provided by FSF (if any) */
 288         if (likely(qtcb->header.log_length)) {
 289                 /* do not trust them ;-) */
 290                 if (unlikely(qtcb->header.log_start >
 291                              sizeof(struct fsf_qtcb))) {
 292                         ZFCP_LOG_NORMAL
 293                             ("bug: ULP (FSF logging) log data starts "
 294                              "beyond end of packet header. Ignored. "
 295                              "(start=%i, size=%li)\n",
 296                              qtcb->header.log_start,
 297                              sizeof(struct fsf_qtcb));
 298                         goto forget_log;
 299                 }
 300                 if (unlikely((size_t) (qtcb->header.log_start +
 301                                        qtcb->header.log_length) >
 302                              sizeof(struct fsf_qtcb))) {
 303                         ZFCP_LOG_NORMAL("bug: ULP (FSF logging) log data ends "
 304                                         "beyond end of packet header. Ignored. "
 305                                         "(start=%i, length=%i, size=%li)\n",
 306                                         qtcb->header.log_start,
 307                                         qtcb->header.log_length,
 308                                         sizeof(struct fsf_qtcb));
 309                         goto forget_log;
 310                 }
 311                 ZFCP_LOG_TRACE("ULP log data: \n");
 312                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 313                               (char *) qtcb + qtcb->header.log_start,
 314                               qtcb->header.log_length);
 315         }
 316  forget_log:
 317
 318         /* evaluate FSF Protocol Status */
 319         switch (qtcb->prefix.prot_status) {
 320
 321         case FSF_PROT_GOOD:
 322         case FSF_PROT_FSF_STATUS_PRESENTED:
 323                 break;
 324
 325         case FSF_PROT_QTCB_VERSION_ERROR:
 326                 ZFCP_LOG_NORMAL("error: The adapter %s contains "
 327                                 "microcode of version 0x%x, the device driver "
 328                                 "only supports 0x%x. Aborting.\n",
 329                                 zfcp_get_busid_by_adapter(adapter),
 330                                 prot_status_qual->version_error.fsf_version,
 331                                 ZFCP_QTCB_VERSION);
 332                 zfcp_erp_adapter_shutdown(adapter, 0);
 333                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 334                 break;
 335
 336         case FSF_PROT_SEQ_NUMB_ERROR:
 337                 ZFCP_LOG_NORMAL("bug: Sequence number mismatch between "
 338                                 "driver (0x%x) and adapter %s (0x%x). "
 339                                 "Restarting all operations on this adapter.\n",
 340                                 qtcb->prefix.req_seq_no,
 341                                 zfcp_get_busid_by_adapter(adapter),
 342                                 prot_status_qual->sequence_error.exp_req_seq_no);
 343                 zfcp_erp_adapter_reopen(adapter, 0);
 344                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 345                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 346                 break;
 347
 348         case FSF_PROT_UNSUPP_QTCB_TYPE:
 349                 ZFCP_LOG_NORMAL("error: Packet header type used by the "
 350                                 "device driver is incompatible with "
 351                                 "that used on adapter %s. "
 352                                 "Stopping all operations on this adapter.\n",
 353                                 zfcp_get_busid_by_adapter(adapter));
 354                 zfcp_erp_adapter_shutdown(adapter, 0);
 355                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 356                 break;
 357
 358         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 359                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 360                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 361                                 &(adapter->status));
 362                 break;
 363
 364         case FSF_PROT_DUPLICATE_REQUEST_ID:
 365                         ZFCP_LOG_NORMAL("bug: The request identifier 0x%Lx "
 366                                         "to the adapter %s is ambiguous. "
 367                                 "Stopping all operations on this adapter.\n",
 368                                 *(unsigned long long*)
 369                                 (&qtcb->bottom.support.req_handle),
 370                                         zfcp_get_busid_by_adapter(adapter));
 371                 zfcp_erp_adapter_shutdown(adapter, 0);
 372                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 373                 break;
 374
 375         case FSF_PROT_LINK_DOWN:
 376                 zfcp_fsf_link_down_info_eval(adapter,
 377                                              &prot_status_qual->link_down_info);
 378                 zfcp_erp_adapter_reopen(adapter, 0);
 379                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 380                 break;
 381
 382         case FSF_PROT_REEST_QUEUE:
 383                 ZFCP_LOG_NORMAL("The local link to adapter with "
 384                               "%s was re-plugged. "
 385                               "Re-starting operations on this adapter.\n",
 386                               zfcp_get_busid_by_adapter(adapter));
 387                 /* All ports should be marked as ready to run again */
 388                 zfcp_erp_modify_adapter_status(adapter,
 389                                                ZFCP_STATUS_COMMON_RUNNING,
 390                                                ZFCP_SET);
 391                 zfcp_erp_adapter_reopen(adapter,
 392                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 393                                         | ZFCP_STATUS_COMMON_ERP_FAILED);
 394                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 395                 break;
 396
 397         case FSF_PROT_ERROR_STATE:
 398                 ZFCP_LOG_NORMAL("error: The adapter %s "
 399                                 "has entered the error state. "
 400                                 "Restarting all operations on this "
 401                                 "adapter.\n",
 402                                 zfcp_get_busid_by_adapter(adapter));
 403                 zfcp_erp_adapter_reopen(adapter, 0);
 404                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 405                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 406                 break;
 407
 408         default:
 409                 ZFCP_LOG_NORMAL("bug: Transfer protocol status information "
 410                                 "provided by the adapter %s "
 411                                 "is not compatible with the device driver. "
 412                                 "Stopping all operations on this adapter. "
 413                                 "(debug info 0x%x).\n",
 414                                 zfcp_get_busid_by_adapter(adapter),
 415                                 qtcb->prefix.prot_status);
 416                 zfcp_erp_adapter_shutdown(adapter, 0);
 417                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 418         }
 419
 420  skip_protstatus:
 421         /*
 422          * always call specific handlers to give them a chance to do
 423          * something meaningful even in error cases
 424          */
 425         zfcp_fsf_fsfstatus_eval(fsf_req);
 426         return retval;
 427 }
 428
 429 /*
 430  * function:    zfcp_fsf_fsfstatus_eval
 431  *
 432  * purpose:     evaluates FSF status of completed FSF request
 433  *              and acts accordingly
 434  *
 435  * returns:
 436  */
 437 static int
 438 zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
 439 {
 440         int retval = 0;
 441
 442         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 443                 goto skip_fsfstatus;
 444         }
 445
 446         /* evaluate FSF Status */
 447         switch (fsf_req->qtcb->header.fsf_status) {
 448         case FSF_UNKNOWN_COMMAND:
 449                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 450                                 "not known by the adapter %s "
 451                                 "Stopping all operations on this adapter. "
 452                                 "(debug info 0x%x).\n",
 453                                 zfcp_get_busid_by_adapter(fsf_req->adapter),
 454                                 fsf_req->qtcb->header.fsf_command);
 455                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 456                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 457                 break;
 458
 459         case FSF_FCP_RSP_AVAILABLE:
 460                 ZFCP_LOG_DEBUG("FCP Sense data will be presented to the "
 461                                "SCSI stack.\n");
 462                 break;
 463
 464         case FSF_ADAPTER_STATUS_AVAILABLE:
 465                 zfcp_fsf_fsfstatus_qual_eval(fsf_req);
 466                 break;
 467         }
 468
 469  skip_fsfstatus:
 470         /*
 471          * always call specific handlers to give them a chance to do
 472          * something meaningful even in error cases
 473          */
 474         zfcp_fsf_req_dispatch(fsf_req);
 475
 476         return retval;
 477 }
 478
 479 /*
 480  * function:    zfcp_fsf_fsfstatus_qual_eval
 481  *
 482  * purpose:     evaluates FSF status-qualifier of completed FSF request
 483  *              and acts accordingly
 484  *
 485  * returns:
 486  */
 487 static int
 488 zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
 489 {
 490         int retval = 0;
 491
 492         switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 493         case FSF_SQ_FCP_RSP_AVAILABLE:
 494                 break;
 495         case FSF_SQ_RETRY_IF_POSSIBLE:
 496                 /* The SCSI-stack may now issue retries or escalate */
 497                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 498                 break;
 499         case FSF_SQ_COMMAND_ABORTED:
 500                 /* Carry the aborted state on to upper layer */
 501                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 502                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 503                 break;
 504         case FSF_SQ_NO_RECOM:
 505                 ZFCP_LOG_NORMAL("bug: No recommendation could be given for a"
 506                                 "problem on the adapter %s "
 507                                 "Stopping all operations on this adapter. ",
 508                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 509                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 510                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 511                 break;
 512         case FSF_SQ_ULP_PROGRAMMING_ERROR:
 513                 ZFCP_LOG_NORMAL("error: not enough SBALs for data transfer "
 514                                 "(adapter %s)\n",
 515                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 516                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 517                 break;
 518         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 519         case FSF_SQ_NO_RETRY_POSSIBLE:
 520         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 521                 /* dealt with in the respective functions */
 522                 break;
 523         default:
 524                 ZFCP_LOG_NORMAL("bug: Additional status info could "
 525                                 "not be interpreted properly.\n");
 526                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 527                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
 528                               sizeof (union fsf_status_qual));
 529                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 530                 break;
 531         }
 532
 533         return retval;
 534 }
 535
 536 /**
 537  * zfcp_fsf_link_down_info_eval - evaluate link down information block
 538  */
 539 static void
 540 zfcp_fsf_link_down_info_eval(struct zfcp_adapter *adapter,
 541                              struct fsf_link_down_info *link_down)
 542 {
 543         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 544                              &adapter->status))
 545                 return;
 546
 547         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 548
 549         if (link_down == NULL)
 550                 goto out;
 551
 552         switch (link_down->error_code) {
 553         case FSF_PSQ_LINK_NO_LIGHT:
 554                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 555                                 "(no light detected)\n",
 556                                 zfcp_get_busid_by_adapter(adapter));
 557                 break;
 558         case FSF_PSQ_LINK_WRAP_PLUG:
 559                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 560                                 "(wrap plug detected)\n",
 561                                 zfcp_get_busid_by_adapter(adapter));
 562                 break;
 563         case FSF_PSQ_LINK_NO_FCP:
 564                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 565                                 "(adjacent node on link does not support FCP)\n",
 566                                 zfcp_get_busid_by_adapter(adapter));
 567                 break;
 568         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 569                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 570                                 "(firmware update in progress)\n",
 571                                 zfcp_get_busid_by_adapter(adapter));
 572                         break;
 573         case FSF_PSQ_LINK_INVALID_WWPN:
 574                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 575                                 "(duplicate or invalid WWPN detected)\n",
 576                                 zfcp_get_busid_by_adapter(adapter));
 577                 break;
 578         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 579                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 580                                 "(no support for NPIV by Fabric)\n",
 581                                 zfcp_get_busid_by_adapter(adapter));
 582                 break;
 583         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 584                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 585                                 "(out of resource in FCP daughtercard)\n",
 586                                 zfcp_get_busid_by_adapter(adapter));
 587                 break;
 588         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 589                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 590                                 "(out of resource in Fabric)\n",
 591                                 zfcp_get_busid_by_adapter(adapter));
 592                 break;
 593         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 594                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 595                                 "(unable to Fabric login)\n",
 596                                 zfcp_get_busid_by_adapter(adapter));
 597                 break;
 598         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 599                 ZFCP_LOG_NORMAL("WWPN assignment file corrupted on adapter %s\n",
 600                                 zfcp_get_busid_by_adapter(adapter));
 601                 break;
 602         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 603                 ZFCP_LOG_NORMAL("Mode table corrupted on adapter %s\n",
 604                                 zfcp_get_busid_by_adapter(adapter));
 605                 break;
 606         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 607                 ZFCP_LOG_NORMAL("No WWPN for assignment table on adapter %s\n",
 608                                 zfcp_get_busid_by_adapter(adapter));
 609                 break;
 610         default:
 611                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 612                                 "(warning: unknown reason code %d)\n",
 613                                 zfcp_get_busid_by_adapter(adapter),
 614                                 link_down->error_code);
 615         }
 616
 617         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 618                 ZFCP_LOG_DEBUG("Debug information to link down: "
 619                                "primary_status=0x%02x "
 620                                "ioerr_code=0x%02x "
 621                                "action_code=0x%02x "
 622                                "reason_code=0x%02x "
 623                                "explanation_code=0x%02x "
 624                                "vendor_specific_code=0x%02x\n",
 625                                 link_down->primary_status,
 626                                 link_down->ioerr_code,
 627                                 link_down->action_code,
 628                                 link_down->reason_code,
 629                                 link_down->explanation_code,
 630                                 link_down->vendor_specific_code);
 631
 632  out:
 633         zfcp_erp_adapter_failed(adapter);
 634 }
 635
 636 /*
 637  * function:    zfcp_fsf_req_dispatch
 638  *
 639  * purpose:     calls the appropriate command specific handler
 640  *
 641  * returns:
 642  */
 643 static int
 644 zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
 645 {
 646         struct zfcp_erp_action *erp_action = fsf_req->erp_action;
 647         struct zfcp_adapter *adapter = fsf_req->adapter;
 648         int retval = 0;
 649
 650
 651         switch (fsf_req->fsf_command) {
 652
 653         case FSF_QTCB_FCP_CMND:
 654                 zfcp_fsf_send_fcp_command_handler(fsf_req);
 655                 break;
 656
 657         case FSF_QTCB_ABORT_FCP_CMND:
 658                 zfcp_fsf_abort_fcp_command_handler(fsf_req);
 659                 break;
 660
 661         case FSF_QTCB_SEND_GENERIC:
 662                 zfcp_fsf_send_ct_handler(fsf_req);
 663                 break;
 664
 665         case FSF_QTCB_OPEN_PORT_WITH_DID:
 666                 zfcp_fsf_open_port_handler(fsf_req);
 667                 break;
 668
 669         case FSF_QTCB_OPEN_LUN:
 670                 zfcp_fsf_open_unit_handler(fsf_req);
 671                 break;
 672
 673         case FSF_QTCB_CLOSE_LUN:
 674                 zfcp_fsf_close_unit_handler(fsf_req);
 675                 break;
 676
 677         case FSF_QTCB_CLOSE_PORT:
 678                 zfcp_fsf_close_port_handler(fsf_req);
 679                 break;
 680
 681         case FSF_QTCB_CLOSE_PHYSICAL_PORT:
 682                 zfcp_fsf_close_physical_port_handler(fsf_req);
 683                 break;
 684
 685         case FSF_QTCB_EXCHANGE_CONFIG_DATA:
 686                 zfcp_fsf_exchange_config_data_handler(fsf_req);
 687                 break;
 688
 689         case FSF_QTCB_EXCHANGE_PORT_DATA:
 690                 zfcp_fsf_exchange_port_data_handler(fsf_req);
 691                 break;
 692
 693         case FSF_QTCB_SEND_ELS:
 694                 zfcp_fsf_send_els_handler(fsf_req);
 695                 break;
 696
 697         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 698                 zfcp_fsf_control_file_handler(fsf_req);
 699                 break;
 700
 701         case FSF_QTCB_UPLOAD_CONTROL_FILE:
 702                 zfcp_fsf_control_file_handler(fsf_req);
 703                 break;
 704
 705         default:
 706                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 707                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 708                                 "not supported by the adapter %s\n",
 709                                 zfcp_get_busid_by_adapter(adapter));
 710                 if (fsf_req->fsf_command != fsf_req->qtcb->header.fsf_command)
 711                         ZFCP_LOG_NORMAL
 712                             ("bug: Command issued by the device driver differs "
 713                              "from the command returned by the adapter %s "
 714                              "(debug info 0x%x, 0x%x).\n",
 715                              zfcp_get_busid_by_adapter(adapter),
 716                              fsf_req->fsf_command,
 717                              fsf_req->qtcb->header.fsf_command);
 718         }
 719
 720         if (!erp_action)
 721                 return retval;
 722
 723         zfcp_erp_async_handler(erp_action, 0);
 724
 725         return retval;
 726 }
 727
 728 /*
 729  * function:    zfcp_fsf_status_read
 730  *
 731  * purpose:     initiates a Status Read command at the specified adapter
 732  *
 733  * returns:
 734  */
 735 int
 736 zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
 737 {
 738         struct zfcp_fsf_req *fsf_req;
 739         struct fsf_status_read_buffer *status_buffer;
 740         unsigned long lock_flags;
 741         volatile struct qdio_buffer_element *sbale;
 742         int retval = 0;
 743
 744         /* setup new FSF request */
 745         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 746                                      req_flags | ZFCP_REQ_NO_QTCB,
 747                                      adapter->pool.fsf_req_status_read,
 748                                      &lock_flags, &fsf_req);
 749         if (retval < 0) {
 750                 ZFCP_LOG_INFO("error: Could not create unsolicited status "
 751                               "buffer for adapter %s.\n",
 752                               zfcp_get_busid_by_adapter(adapter));
 753                 goto failed_req_create;
 754         }
 755
 756         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 757         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 758         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 759         fsf_req->sbale_curr = 2;
 760
 761         status_buffer =
 762                 mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 763         if (!status_buffer) {
 764                 ZFCP_LOG_NORMAL("bug: could not get some buffer\n");
 765                 goto failed_buf;
 766         }
 767         memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
 768         fsf_req->data = (unsigned long) status_buffer;
 769
 770         /* insert pointer to respective buffer */
 771         sbale = zfcp_qdio_sbale_curr(fsf_req);
 772         sbale->addr = (void *) status_buffer;
 773         sbale->length = sizeof(struct fsf_status_read_buffer);
 774
 775         retval = zfcp_fsf_req_send(fsf_req);
 776         if (retval) {
 777                 ZFCP_LOG_DEBUG("error: Could not set-up unsolicited status "
 778                                "environment.\n");
 779                 goto failed_req_send;
 780         }
 781
 782         ZFCP_LOG_TRACE("Status Read request initiated (adapter%s)\n",
 783                        zfcp_get_busid_by_adapter(adapter));
 784         goto out;
 785
 786  failed_req_send:
 787         mempool_free(status_buffer, adapter->pool.data_status_read);
 788
 789  failed_buf:
 790         zfcp_fsf_req_free(fsf_req);
 791  failed_req_create:
 792         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 793  out:
 794         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 795         return retval;
 796 }
 797
 798 static int
 799 zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
 800 {
 801         struct fsf_status_read_buffer *status_buffer;
 802         struct zfcp_adapter *adapter;
 803         struct zfcp_port *port;
 804         unsigned long flags;
 805
 806         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
 807         adapter = fsf_req->adapter;
 808
 809         read_lock_irqsave(&zfcp_data.config_lock, flags);
 810         list_for_each_entry(port, &adapter->port_list_head, list)
 811             if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
 812                 break;
 813         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 814
 815         if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
 816                 ZFCP_LOG_NORMAL("bug: Reopen port indication received for"
 817                                 "nonexisting port with d_id 0x%06x on "
 818                                 "adapter %s. Ignored.\n",
 819                                 status_buffer->d_id & ZFCP_DID_MASK,
 820                                 zfcp_get_busid_by_adapter(adapter));
 821                 goto out;
 822         }
 823
 824         switch (status_buffer->status_subtype) {
 825
 826         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 827                 debug_text_event(adapter->erp_dbf, 3, "unsol_pc_phys:");
 828                 zfcp_erp_port_reopen(port, 0);
 829                 break;
 830
 831         case FSF_STATUS_READ_SUB_ERROR_PORT:
 832                 debug_text_event(adapter->erp_dbf, 1, "unsol_pc_err:");
 833                 zfcp_erp_port_shutdown(port, 0);
 834                 break;
 835
 836         default:
 837                 debug_text_event(adapter->erp_dbf, 0, "unsol_unk_sub:");
 838                 debug_exception(adapter->erp_dbf, 0,
 839                                 &status_buffer->status_subtype, sizeof (u32));
 840                 ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
 841                                 "for a reopen indication on port with "
 842                                 "d_id 0x%06x on the adapter %s. "
 843                                 "Ignored. (debug info 0x%x)\n",
 844                                 status_buffer->d_id,
 845                                 zfcp_get_busid_by_adapter(adapter),
 846                                 status_buffer->status_subtype);
 847         }
 848  out:
 849         return 0;
 850 }
 851
 852 /*
 853  * function:    zfcp_fsf_status_read_handler
 854  *
 855  * purpose:     is called for finished Open Port command
 856  *
 857  * returns:
 858  */
 859 static int
 860 zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
 861 {
 862         int retval = 0;
 863         struct zfcp_adapter *adapter = fsf_req->adapter;
 864         struct fsf_status_read_buffer *status_buffer =
 865                 (struct fsf_status_read_buffer *) fsf_req->data;
 866         struct fsf_bit_error_payload *fsf_bit_error;
 867
 868         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 869                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, status_buffer);
 870                 mempool_free(status_buffer, adapter->pool.data_status_read);
 871                 zfcp_fsf_req_free(fsf_req);
 872                 goto out;
 873         }
 874
 875         zfcp_hba_dbf_event_fsf_unsol("read", adapter, status_buffer);
 876
 877         switch (status_buffer->status_type) {
 878
 879         case FSF_STATUS_READ_PORT_CLOSED:
 880                 zfcp_fsf_status_read_port_closed(fsf_req);
 881                 break;
 882
 883         case FSF_STATUS_READ_INCOMING_ELS:
 884                 zfcp_fsf_incoming_els(fsf_req);
 885                 break;
 886
 887         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 888                 ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
 889                               zfcp_get_busid_by_adapter(adapter));
 890                 break;
 891
 892         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 893                 fsf_bit_error = (struct fsf_bit_error_payload *)
 894                         status_buffer->payload;
 895                 ZFCP_LOG_NORMAL("Warning: bit error threshold data "
 896                     "received (adapter %s, "
 897                     "link failures = %i, loss of sync errors = %i, "
 898                     "loss of signal errors = %i, "
 899                     "primitive sequence errors = %i, "
 900                     "invalid transmission word errors = %i, "
 901                     "CRC errors = %i)\n",
 902                     zfcp_get_busid_by_adapter(adapter),
 903                     fsf_bit_error->link_failure_error_count,
 904                     fsf_bit_error->loss_of_sync_error_count,
 905                     fsf_bit_error->loss_of_signal_error_count,
 906                     fsf_bit_error->primitive_sequence_error_count,
 907                     fsf_bit_error->invalid_transmission_word_error_count,
 908                     fsf_bit_error->crc_error_count);
 909                 ZFCP_LOG_INFO("Additional bit error threshold data "
 910                     "(adapter %s, "
 911                     "primitive sequence event time-outs = %i, "
 912                     "elastic buffer overrun errors = %i, "
 913                     "advertised receive buffer-to-buffer credit = %i, "
 914                     "current receice buffer-to-buffer credit = %i, "
 915                     "advertised transmit buffer-to-buffer credit = %i, "
 916                     "current transmit buffer-to-buffer credit = %i)\n",
 917                     zfcp_get_busid_by_adapter(adapter),
 918                     fsf_bit_error->primitive_sequence_event_timeout_count,
 919                     fsf_bit_error->elastic_buffer_overrun_error_count,
 920                     fsf_bit_error->advertised_receive_b2b_credit,
 921                     fsf_bit_error->current_receive_b2b_credit,
 922                     fsf_bit_error->advertised_transmit_b2b_credit,
 923                     fsf_bit_error->current_transmit_b2b_credit);
 924                 break;
 925
 926         case FSF_STATUS_READ_LINK_DOWN:
 927                 switch (status_buffer->status_subtype) {
 928                 case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 929                         ZFCP_LOG_INFO("Physical link to adapter %s is down\n",
 930                                       zfcp_get_busid_by_adapter(adapter));
 931                         zfcp_fsf_link_down_info_eval(adapter,
 932                                 (struct fsf_link_down_info *)
 933                                 &status_buffer->payload);
 934                         break;
 935                 case FSF_STATUS_READ_SUB_FDISC_FAILED:
 936                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 937                                       "due to failed FDISC login\n",
 938                                       zfcp_get_busid_by_adapter(adapter));
 939                         zfcp_fsf_link_down_info_eval(adapter,
 940                                 (struct fsf_link_down_info *)
 941                                 &status_buffer->payload);
 942                         break;
 943                 case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 944                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 945                                       "due to firmware update on adapter\n",
 946                                       zfcp_get_busid_by_adapter(adapter));
 947                         zfcp_fsf_link_down_info_eval(adapter, NULL);
 948                         break;
 949                 default:
 950                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 951                                       "due to unknown reason\n",
 952                                       zfcp_get_busid_by_adapter(adapter));
 953                         zfcp_fsf_link_down_info_eval(adapter, NULL);
 954                 };
 955                 break;
 956
 957         case FSF_STATUS_READ_LINK_UP:
 958                 ZFCP_LOG_NORMAL("Local link to adapter %s was replugged. "
 959                                 "Restarting operations on this adapter\n",
 960                                 zfcp_get_busid_by_adapter(adapter));
 961                 /* All ports should be marked as ready to run again */
 962                 zfcp_erp_modify_adapter_status(adapter,
 963                                                ZFCP_STATUS_COMMON_RUNNING,
 964                                                ZFCP_SET);
 965                 zfcp_erp_adapter_reopen(adapter,
 966                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 967                                         | ZFCP_STATUS_COMMON_ERP_FAILED);
 968                 break;
 969
 970         case FSF_STATUS_READ_NOTIFICATION_LOST:
 971                 ZFCP_LOG_NORMAL("Unsolicited status notification(s) lost: "
 972                                 "adapter %s%s%s%s%s%s%s%s%s\n",
 973                                 zfcp_get_busid_by_adapter(adapter),
 974                                 (status_buffer->status_subtype &
 975                                         FSF_STATUS_READ_SUB_INCOMING_ELS) ?
 976                                         ", incoming ELS" : "",
 977                                 (status_buffer->status_subtype &
 978                                         FSF_STATUS_READ_SUB_SENSE_DATA) ?
 979                                         ", sense data" : "",
 980                                 (status_buffer->status_subtype &
 981                                         FSF_STATUS_READ_SUB_LINK_STATUS) ?
 982                                         ", link status change" : "",
 983                                 (status_buffer->status_subtype &
 984                                         FSF_STATUS_READ_SUB_PORT_CLOSED) ?
 985                                         ", port close" : "",
 986                                 (status_buffer->status_subtype &
 987                                         FSF_STATUS_READ_SUB_BIT_ERROR_THRESHOLD) ?
 988                                         ", bit error exception" : "",
 989                                 (status_buffer->status_subtype &
 990                                         FSF_STATUS_READ_SUB_ACT_UPDATED) ?
 991                                         ", ACT update" : "",
 992                                 (status_buffer->status_subtype &
 993                                         FSF_STATUS_READ_SUB_ACT_HARDENED) ?
 994                                         ", ACT hardening" : "",
 995                                 (status_buffer->status_subtype &
 996                                         FSF_STATUS_READ_SUB_FEATURE_UPDATE_ALERT) ?
 997                                         ", adapter feature change" : "");
 998
 999                 if (status_buffer->status_subtype &
1000                     FSF_STATUS_READ_SUB_ACT_UPDATED)
1001                         zfcp_erp_adapter_access_changed(adapter);
1002                 break;
1003
1004         case FSF_STATUS_READ_CFDC_UPDATED:
1005                 ZFCP_LOG_NORMAL("CFDC has been updated on the adapter %s\n",
1006                               zfcp_get_busid_by_adapter(adapter));
1007                 zfcp_erp_adapter_access_changed(adapter);
1008                 break;
1009
1010         case FSF_STATUS_READ_CFDC_HARDENED:
1011                 switch (status_buffer->status_subtype) {
1012                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
1013                         ZFCP_LOG_NORMAL("CFDC of adapter %s saved on SE\n",
1014                                       zfcp_get_busid_by_adapter(adapter));
1015                         break;
1016                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
1017                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been copied "
1018                                       "to the secondary SE\n",
1019                                 zfcp_get_busid_by_adapter(adapter));
1020                         break;
1021                 default:
1022                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been hardened\n",
1023                                       zfcp_get_busid_by_adapter(adapter));
1024                 }
1025                 break;
1026
1027         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
1028                 debug_text_event(adapter->erp_dbf, 2, "unsol_features:");
1029                 ZFCP_LOG_INFO("List of supported features on adapter %s has "
1030                               "been changed from 0x%08X to 0x%08X\n",
1031                               zfcp_get_busid_by_adapter(adapter),
1032                               *(u32*) (status_buffer->payload + 4),
1033                               *(u32*) (status_buffer->payload));
1034                 adapter->adapter_features = *(u32*) status_buffer->payload;
1035                 break;
1036
1037         default:
1038                 ZFCP_LOG_NORMAL("warning: An unsolicited status packet of unknown "
1039                                 "type was received (debug info 0x%x)\n",
1040                                 status_buffer->status_type);
1041                 ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
1042                                status_buffer);
1043                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1044                               (char *) status_buffer,
1045                               sizeof (struct fsf_status_read_buffer));
1046                 break;
1047         }
1048         mempool_free(status_buffer, adapter->pool.data_status_read);
1049         zfcp_fsf_req_free(fsf_req);
1050         /*
1051          * recycle buffer and start new request repeat until outbound
1052          * queue is empty or adapter shutdown is requested
1053          */
1054         /*
1055          * FIXME(qdio):
1056          * we may wait in the req_create for 5s during shutdown, so
1057          * qdio_cleanup will have to wait at least that long before returning
1058          * with failure to allow us a proper cleanup under all circumstances
1059          */
1060         /*
1061          * FIXME:
1062          * allocation failure possible? (Is this code needed?)
1063          */
1064         retval = zfcp_fsf_status_read(adapter, 0);
1065         if (retval < 0) {
1066                 ZFCP_LOG_INFO("Failed to create unsolicited status read "
1067                               "request for the adapter %s.\n",
1068                               zfcp_get_busid_by_adapter(adapter));
1069                 /* temporary fix to avoid status read buffer shortage */
1070                 adapter->status_read_failed++;
1071                 if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
1072                     < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
1073                         ZFCP_LOG_INFO("restart adapter %s due to status read "
1074                                       "buffer shortage\n",
1075                                       zfcp_get_busid_by_adapter(adapter));
1076                         zfcp_erp_adapter_reopen(adapter, 0);
1077                 }
1078         }
1079  out:
1080         return retval;
1081 }
1082
1083 /*
1084  * function:    zfcp_fsf_abort_fcp_command
1085  *
1086  * purpose:     tells FSF to abort a running SCSI command
1087  *
1088  * returns:     address of initiated FSF request
1089  *              NULL - request could not be initiated
1090  *
1091  * FIXME(design): should be watched by a timeout !!!
1092  * FIXME(design) shouldn't this be modified to return an int
1093  *               also...don't know how though
1094  */
1095 struct zfcp_fsf_req *
1096 zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
1097                            struct zfcp_adapter *adapter,
1098                            struct zfcp_unit *unit, int req_flags)
1099 {
1100         volatile struct qdio_buffer_element *sbale;
1101         struct zfcp_fsf_req *fsf_req = NULL;
1102         unsigned long lock_flags;
1103         int retval = 0;
1104
1105         /* setup new FSF request */
1106         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
1107                                      req_flags, adapter->pool.fsf_req_abort,
1108                                      &lock_flags, &fsf_req);
1109         if (retval < 0) {
1110                 ZFCP_LOG_INFO("error: Failed to create an abort command "
1111                               "request for lun 0x%016Lx on port 0x%016Lx "
1112                               "on adapter %s.\n",
1113                               unit->fcp_lun,
1114                               unit->port->wwpn,
1115                               zfcp_get_busid_by_adapter(adapter));
1116                 goto out;
1117         }
1118
1119         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1120         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1121         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1122
1123         fsf_req->data = (unsigned long) unit;
1124
1125         /* set handles of unit and its parent port in QTCB */
1126         fsf_req->qtcb->header.lun_handle = unit->handle;
1127         fsf_req->qtcb->header.port_handle = unit->port->handle;
1128
1129         /* set handle of request which should be aborted */
1130         fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1131
1132         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
1133         retval = zfcp_fsf_req_send(fsf_req);
1134         if (retval) {
1135                 ZFCP_LOG_INFO("error: Failed to send abort command request "
1136                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
1137                               zfcp_get_busid_by_adapter(adapter),
1138                               unit->port->wwpn, unit->fcp_lun);
1139                 zfcp_fsf_req_free(fsf_req);
1140                 fsf_req = NULL;
1141                 goto out;
1142         }
1143
1144         ZFCP_LOG_DEBUG("Abort FCP Command request initiated "
1145                        "(adapter%s, port d_id=0x%06x, "
1146                        "unit x%016Lx, old_req_id=0x%lx)\n",
1147                        zfcp_get_busid_by_adapter(adapter),
1148                        unit->port->d_id,
1149                        unit->fcp_lun, old_req_id);
1150  out:
1151         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
1152         return fsf_req;
1153 }
1154
1155 /*
1156  * function:    zfcp_fsf_abort_fcp_command_handler
1157  *
1158  * purpose:     is called for finished Abort FCP Command request
1159  *
1160  * returns:
1161  */
1162 static int
1163 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
1164 {
1165         int retval = -EINVAL;
1166         struct zfcp_unit *unit;
1167         unsigned char status_qual =
1168             new_fsf_req->qtcb->header.fsf_status_qual.word[0];
1169
1170         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1171                 /* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
1172                 goto skip_fsfstatus;
1173         }
1174
1175         unit = (struct zfcp_unit *) new_fsf_req->data;
1176
1177         /* evaluate FSF status in QTCB */
1178         switch (new_fsf_req->qtcb->header.fsf_status) {
1179
1180         case FSF_PORT_HANDLE_NOT_VALID:
1181                 if (status_qual >> 4 != status_qual % 0xf) {
1182                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1183                                          "fsf_s_phand_nv0");
1184                         /*
1185                          * In this case a command that was sent prior to a port
1186                          * reopen was aborted (handles are different). This is
1187                          * fine.
1188                          */
1189                 } else {
1190                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1191                                       "port 0x%016Lx on adapter %s invalid. "
1192                                       "This may happen occasionally.\n",
1193                                       unit->port->handle,
1194                                       unit->port->wwpn,
1195                                       zfcp_get_busid_by_unit(unit));
1196                         ZFCP_LOG_INFO("status qualifier:\n");
1197                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1198                                       (char *) &new_fsf_req->qtcb->header.
1199                                       fsf_status_qual,
1200                                       sizeof (union fsf_status_qual));
1201                         /* Let's hope this sorts out the mess */
1202                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1203                                          "fsf_s_phand_nv1");
1204                         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
1205                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1206                 }
1207                 break;
1208
1209         case FSF_LUN_HANDLE_NOT_VALID:
1210                 if (status_qual >> 4 != status_qual % 0xf) {
1211                         /* 2 */
1212                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1213                                          "fsf_s_lhand_nv0");
1214                         /*
1215                          * In this case a command that was sent prior to a unit
1216                          * reopen was aborted (handles are different).
1217                          * This is fine.
1218                          */
1219                 } else {
1220                         ZFCP_LOG_INFO
1221                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1222                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1223                              "invalid. This may happen in rare cases. "
1224                              "Trying to re-establish link.\n",
1225                              unit->handle,
1226                              unit->fcp_lun,
1227                              unit->port->wwpn,
1228                              zfcp_get_busid_by_unit(unit));
1229                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1230                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1231                                       (char *) &new_fsf_req->qtcb->header.
1232                                       fsf_status_qual,
1233                                       sizeof (union fsf_status_qual));
1234                         /* Let's hope this sorts out the mess */
1235                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1236                                          "fsf_s_lhand_nv1");
1237                         zfcp_erp_port_reopen(unit->port, 0);
1238                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1239                 }
1240                 break;
1241
1242         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1243                 retval = 0;
1244                 debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1245                                  "fsf_s_no_exist");
1246                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1247                 break;
1248
1249         case FSF_PORT_BOXED:
1250                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1251                               "be reopened\n", unit->port->wwpn,
1252                               zfcp_get_busid_by_unit(unit));
1253                 debug_text_event(new_fsf_req->adapter->erp_dbf, 2,
1254                                  "fsf_s_pboxed");
1255                 zfcp_erp_port_boxed(unit->port);
1256                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1257                     | ZFCP_STATUS_FSFREQ_RETRY;
1258                 break;
1259
1260         case FSF_LUN_BOXED:
1261                 ZFCP_LOG_INFO(
1262                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1263                         "to be reopened\n",
1264                         unit->fcp_lun, unit->port->wwpn,
1265                         zfcp_get_busid_by_unit(unit));
1266                 debug_text_event(new_fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
1267                 zfcp_erp_unit_boxed(unit);
1268                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1269                         | ZFCP_STATUS_FSFREQ_RETRY;
1270                 break;
1271
1272         case FSF_ADAPTER_STATUS_AVAILABLE:
1273                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1274                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1275                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1276                                          "fsf_sq_ltest");
1277                         zfcp_test_link(unit->port);
1278                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1279                         break;
1280                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1281                         /* SCSI stack will escalate */
1282                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1283                                          "fsf_sq_ulp");
1284                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1285                         break;
1286                 default:
1287                         ZFCP_LOG_NORMAL
1288                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1289                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1290                         debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1291                                          "fsf_sq_inval:");
1292                         debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1293                                         &new_fsf_req->qtcb->header.
1294                                         fsf_status_qual.word[0], sizeof (u32));
1295                         break;
1296                 }
1297                 break;
1298
1299         case FSF_GOOD:
1300                 retval = 0;
1301                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1302                 break;
1303
1304         default:
1305                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1306                                 "(debug info 0x%x)\n",
1307                                 new_fsf_req->qtcb->header.fsf_status);
1308                 debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1309                                  "fsf_s_inval:");
1310                 debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1311                                 &new_fsf_req->qtcb->header.fsf_status,
1312                                 sizeof (u32));
1313                 break;
1314         }
1315  skip_fsfstatus:
1316         return retval;
1317 }
1318
1319 /**
1320  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1321  *      one SBALE
1322  * Two scatter-gather lists are passed, one for the reqeust and one for the
1323  * response.
1324  */
1325 static inline int
1326 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1327                   struct scatterlist *resp, int resp_count)
1328 {
1329         return ((req_count == 1) &&
1330                 (resp_count == 1) &&
1331                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1332                   PAGE_MASK) ==
1333                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1334                                    req[0].length - 1) & PAGE_MASK)) &&
1335                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1336                   PAGE_MASK) ==
1337                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1338                                    resp[0].length - 1) & PAGE_MASK)));
1339 }
1340
1341 /**
1342  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1343  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1344  *      the request
1345  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1346  *      a struct zfcp_fsf_req
1347  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1348  *      is sent within error recovery
1349  */
1350 int
1351 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1352                  struct zfcp_erp_action *erp_action)
1353 {
1354         volatile struct qdio_buffer_element *sbale;
1355         struct zfcp_port *port;
1356         struct zfcp_adapter *adapter;
1357         struct zfcp_fsf_req *fsf_req;
1358         unsigned long lock_flags;
1359         int bytes;
1360         int ret = 0;
1361
1362         port = ct->port;
1363         adapter = port->adapter;
1364
1365         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1366                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1367                                   pool, &lock_flags, &fsf_req);
1368         if (ret < 0) {
1369                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1370                               "adapter: %s\n",
1371                               zfcp_get_busid_by_adapter(adapter));
1372                 goto failed_req;
1373         }
1374
1375         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1376         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1377                               ct->resp, ct->resp_count)){
1378                 /* both request buffer and response buffer
1379                    fit into one sbale each */
1380                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1381                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1382                 sbale[2].length = ct->req[0].length;
1383                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1384                 sbale[3].length = ct->resp[0].length;
1385                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1386         } else if (adapter->adapter_features &
1387                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1388                 /* try to use chained SBALs */
1389                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1390                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1391                                                 ct->req, ct->req_count,
1392                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1393                 if (bytes <= 0) {
1394                         ZFCP_LOG_INFO("error: creation of CT request failed "
1395                                       "on adapter %s\n",
1396                                       zfcp_get_busid_by_adapter(adapter));
1397                         if (bytes == 0)
1398                                 ret = -ENOMEM;
1399                         else
1400                                 ret = bytes;
1401
1402                         goto failed_send;
1403                 }
1404                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1405                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1406                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1407                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1408                                                 ct->resp, ct->resp_count,
1409                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1410                 if (bytes <= 0) {
1411                         ZFCP_LOG_INFO("error: creation of CT request failed "
1412                                       "on adapter %s\n",
1413                                       zfcp_get_busid_by_adapter(adapter));
1414                         if (bytes == 0)
1415                                 ret = -ENOMEM;
1416                         else
1417                                 ret = bytes;
1418
1419                         goto failed_send;
1420                 }
1421                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1422         } else {
1423                 /* reject send generic request */
1424                 ZFCP_LOG_INFO(
1425                         "error: microcode does not support chained SBALs,"
1426                         "CT request too big (adapter %s)\n",
1427                         zfcp_get_busid_by_adapter(adapter));
1428                 ret = -EOPNOTSUPP;
1429                 goto failed_send;
1430         }
1431
1432         /* settings in QTCB */
1433         fsf_req->qtcb->header.port_handle = port->handle;
1434         fsf_req->qtcb->bottom.support.service_class =
1435                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1436         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1437         fsf_req->data = (unsigned long) ct;
1438
1439         zfcp_san_dbf_event_ct_request(fsf_req);
1440
1441         if (erp_action) {
1442                 erp_action->fsf_req = fsf_req;
1443                 fsf_req->erp_action = erp_action;
1444                 zfcp_erp_start_timer(fsf_req);
1445         } else
1446                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1447
1448         ret = zfcp_fsf_req_send(fsf_req);
1449         if (ret) {
1450                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1451                                "(adapter %s, port 0x%016Lx)\n",
1452                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1453                 goto failed_send;
1454         }
1455
1456         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1457                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1458         goto out;
1459
1460  failed_send:
1461         zfcp_fsf_req_free(fsf_req);
1462         if (erp_action != NULL) {
1463                 erp_action->fsf_req = NULL;
1464         }
1465  failed_req:
1466  out:
1467         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1468                                 lock_flags);
1469         return ret;
1470 }
1471
1472 /**
1473  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1474  * @fsf_req: pointer to struct zfcp_fsf_req
1475  *
1476  * Data specific for the Generic Service request is passed using
1477  * fsf_req->data. There we find the pointer to struct zfcp_send_ct.
1478  * Usually a specific handler for the CT request is called which is
1479  * found in this structure.
1480  */
1481 static int
1482 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1483 {
1484         struct zfcp_port *port;
1485         struct zfcp_adapter *adapter;
1486         struct zfcp_send_ct *send_ct;
1487         struct fsf_qtcb_header *header;
1488         struct fsf_qtcb_bottom_support *bottom;
1489         int retval = -EINVAL;
1490         u16 subtable, rule, counter;
1491
1492         adapter = fsf_req->adapter;
1493         send_ct = (struct zfcp_send_ct *) fsf_req->data;
1494         port = send_ct->port;
1495         header = &fsf_req->qtcb->header;
1496         bottom = &fsf_req->qtcb->bottom.support;
1497
1498         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1499                 goto skip_fsfstatus;
1500
1501         /* evaluate FSF status in QTCB */
1502         switch (header->fsf_status) {
1503
1504         case FSF_GOOD:
1505                 zfcp_san_dbf_event_ct_response(fsf_req);
1506                 retval = 0;
1507                 break;
1508
1509         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1510                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1511                               "class %d.\n",
1512                               zfcp_get_busid_by_port(port),
1513                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1514                 /* stop operation for this adapter */
1515                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1516                 zfcp_erp_adapter_shutdown(adapter, 0);
1517                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1518                 break;
1519
1520         case FSF_ADAPTER_STATUS_AVAILABLE:
1521                 switch (header->fsf_status_qual.word[0]){
1522                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1523                         /* reopening link to port */
1524                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1525                         zfcp_test_link(port);
1526                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1527                         break;
1528                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1529                         /* ERP strategy will escalate */
1530                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1531                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1532                         break;
1533                 default:
1534                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1535                                       "arrived.\n",
1536                                       header->fsf_status_qual.word[0]);
1537                         break;
1538                 }
1539                 break;
1540
1541         case FSF_ACCESS_DENIED:
1542                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1543                                 "command (adapter %s, port d_id=0x%06x)\n",
1544                                 zfcp_get_busid_by_port(port), port->d_id);
1545                 for (counter = 0; counter < 2; counter++) {
1546                         subtable = header->fsf_status_qual.halfword[counter * 2];
1547                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1548                         switch (subtable) {
1549                         case FSF_SQ_CFDC_SUBTABLE_OS:
1550                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1551                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1552                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1553                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1554                                         zfcp_act_subtable_type[subtable], rule);
1555                                 break;
1556                         }
1557                 }
1558                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1559                 zfcp_erp_port_access_denied(port);
1560                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1561                 break;
1562
1563         case FSF_GENERIC_COMMAND_REJECTED:
1564                 ZFCP_LOG_INFO("generic service command rejected "
1565                               "(adapter %s, port d_id=0x%06x)\n",
1566                               zfcp_get_busid_by_port(port), port->d_id);
1567                 ZFCP_LOG_INFO("status qualifier:\n");
1568                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1569                               (char *) &header->fsf_status_qual,
1570                               sizeof (union fsf_status_qual));
1571                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_gcom_rej");
1572                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1573                 break;
1574
1575         case FSF_PORT_HANDLE_NOT_VALID:
1576                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1577                                "0x%016Lx on adapter %s invalid. This may "
1578                                "happen occasionally.\n", port->handle,
1579                                port->wwpn, zfcp_get_busid_by_port(port));
1580                 ZFCP_LOG_INFO("status qualifier:\n");
1581                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1582                               (char *) &header->fsf_status_qual,
1583                               sizeof (union fsf_status_qual));
1584                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_phandle_nv");
1585                 zfcp_erp_adapter_reopen(adapter, 0);
1586                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1587                 break;
1588
1589         case FSF_PORT_BOXED:
1590                 ZFCP_LOG_INFO("port needs to be reopened "
1591                               "(adapter %s, port d_id=0x%06x)\n",
1592                               zfcp_get_busid_by_port(port), port->d_id);
1593                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
1594                 zfcp_erp_port_boxed(port);
1595                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1596                     | ZFCP_STATUS_FSFREQ_RETRY;
1597                 break;
1598
1599         /* following states should never occure, all cases avoided
1600            in zfcp_fsf_send_ct - but who knows ... */
1601         case FSF_PAYLOAD_SIZE_MISMATCH:
1602                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1603                               "req_buf_length=%d, resp_buf_length=%d)\n",
1604                               zfcp_get_busid_by_adapter(adapter),
1605                               bottom->req_buf_length, bottom->resp_buf_length);
1606                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1607                 break;
1608         case FSF_REQUEST_SIZE_TOO_LARGE:
1609                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1610                               "req_buf_length=%d)\n",
1611                               zfcp_get_busid_by_adapter(adapter),
1612                               bottom->req_buf_length);
1613                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1614                 break;
1615         case FSF_RESPONSE_SIZE_TOO_LARGE:
1616                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1617                               "resp_buf_length=%d)\n",
1618                               zfcp_get_busid_by_adapter(adapter),
1619                               bottom->resp_buf_length);
1620                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1621                 break;
1622         case FSF_SBAL_MISMATCH:
1623                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1624                               "resp_buf_length=%d)\n",
1625                               zfcp_get_busid_by_adapter(adapter),
1626                               bottom->req_buf_length, bottom->resp_buf_length);
1627                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1628                 break;
1629
1630        default:
1631                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1632                                 "(debug info 0x%x)\n", header->fsf_status);
1633                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval:");
1634                 debug_exception(adapter->erp_dbf, 0,
1635                                 &header->fsf_status_qual.word[0], sizeof (u32));
1636                 break;
1637         }
1638
1639 skip_fsfstatus:
1640         send_ct->status = retval;
1641
1642         if (send_ct->handler != NULL)
1643                 send_ct->handler(send_ct->handler_data);
1644
1645         return retval;
1646 }
1647
1648 /**
1649  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1650  * @els: pointer to struct zfcp_send_els which contains all needed data for
1651  *      the command.
1652  */
1653 int
1654 zfcp_fsf_send_els(struct zfcp_send_els *els)
1655 {
1656         volatile struct qdio_buffer_element *sbale;
1657         struct zfcp_fsf_req *fsf_req;
1658         u32 d_id;
1659         struct zfcp_adapter *adapter;
1660         unsigned long lock_flags;
1661         int bytes;
1662         int ret = 0;
1663
1664         d_id = els->d_id;
1665         adapter = els->adapter;
1666
1667         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1668                                   ZFCP_REQ_AUTO_CLEANUP,
1669                                   NULL, &lock_flags, &fsf_req);
1670         if (ret < 0) {
1671                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1672                               "(adapter %s, port d_id: 0x%06x)\n",
1673                               zfcp_get_busid_by_adapter(adapter), d_id);
1674                 goto failed_req;
1675         }
1676
1677         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1678         if (zfcp_use_one_sbal(els->req, els->req_count,
1679                               els->resp, els->resp_count)){
1680                 /* both request buffer and response buffer
1681                    fit into one sbale each */
1682                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1683                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1684                 sbale[2].length = els->req[0].length;
1685                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1686                 sbale[3].length = els->resp[0].length;
1687                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1688         } else if (adapter->adapter_features &
1689                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1690                 /* try to use chained SBALs */
1691                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1692                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1693                                                 els->req, els->req_count,
1694                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1695                 if (bytes <= 0) {
1696                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1697                                       "(adapter %s, port d_id: 0x%06x)\n",
1698                                       zfcp_get_busid_by_adapter(adapter), d_id);
1699                         if (bytes == 0) {
1700                                 ret = -ENOMEM;
1701                         } else {
1702                                 ret = bytes;
1703                         }
1704                         goto failed_send;
1705                 }
1706                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1707                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1708                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1709                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1710                                                 els->resp, els->resp_count,
1711                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1712                 if (bytes <= 0) {
1713                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1714                                       "(adapter %s, port d_id: 0x%06x)\n",
1715                                       zfcp_get_busid_by_adapter(adapter), d_id);
1716                         if (bytes == 0) {
1717                                 ret = -ENOMEM;
1718                         } else {
1719                                 ret = bytes;
1720                         }
1721                         goto failed_send;
1722                 }
1723                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1724         } else {
1725                 /* reject request */
1726                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1727                               ", ELS request too big (adapter %s, "
1728                               "port d_id: 0x%06x)\n",
1729                               zfcp_get_busid_by_adapter(adapter), d_id);
1730                 ret = -EOPNOTSUPP;
1731                 goto failed_send;
1732         }
1733
1734         /* settings in QTCB */
1735         fsf_req->qtcb->bottom.support.d_id = d_id;
1736         fsf_req->qtcb->bottom.support.service_class =
1737                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1738         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1739         fsf_req->data = (unsigned long) els;
1740
1741         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1742
1743         zfcp_san_dbf_event_els_request(fsf_req);
1744
1745         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1746         ret = zfcp_fsf_req_send(fsf_req);
1747         if (ret) {
1748                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1749                                "(adapter %s, port d_id: 0x%06x)\n",
1750                                zfcp_get_busid_by_adapter(adapter), d_id);
1751                 goto failed_send;
1752         }
1753
1754         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1755                        "0x%06x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1756         goto out;
1757
1758  failed_send:
1759         zfcp_fsf_req_free(fsf_req);
1760
1761  failed_req:
1762  out:
1763         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1764                                 lock_flags);
1765
1766         return ret;
1767 }
1768
1769 /**
1770  * zfcp_fsf_send_els_handler - handler for ELS commands
1771  * @fsf_req: pointer to struct zfcp_fsf_req
1772  *
1773  * Data specific for the ELS command is passed using
1774  * fsf_req->data. There we find the pointer to struct zfcp_send_els.
1775  * Usually a specific handler for the ELS command is called which is
1776  * found in this structure.
1777  */
1778 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1779 {
1780         struct zfcp_adapter *adapter;
1781         struct zfcp_port *port;
1782         u32 d_id;
1783         struct fsf_qtcb_header *header;
1784         struct fsf_qtcb_bottom_support *bottom;
1785         struct zfcp_send_els *send_els;
1786         int retval = -EINVAL;
1787         u16 subtable, rule, counter;
1788
1789         send_els = (struct zfcp_send_els *) fsf_req->data;
1790         adapter = send_els->adapter;
1791         port = send_els->port;
1792         d_id = send_els->d_id;
1793         header = &fsf_req->qtcb->header;
1794         bottom = &fsf_req->qtcb->bottom.support;
1795
1796         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1797                 goto skip_fsfstatus;
1798
1799         switch (header->fsf_status) {
1800
1801         case FSF_GOOD:
1802                 zfcp_san_dbf_event_els_response(fsf_req);
1803                 retval = 0;
1804                 break;
1805
1806         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1807                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1808                               "class %d.\n",
1809                               zfcp_get_busid_by_adapter(adapter),
1810                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1811                 /* stop operation for this adapter */
1812                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1813                 zfcp_erp_adapter_shutdown(adapter, 0);
1814                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1815                 break;
1816
1817         case FSF_ADAPTER_STATUS_AVAILABLE:
1818                 switch (header->fsf_status_qual.word[0]){
1819                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1820                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1821                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1822                                 zfcp_test_link(port);
1823                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1824                         break;
1825                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1826                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1827                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1828                         retval =
1829                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1830                                               (struct zfcp_ls_rjt_par *)
1831                                               &header->fsf_status_qual.word[2]);
1832                         break;
1833                 case FSF_SQ_RETRY_IF_POSSIBLE:
1834                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_retry");
1835                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1836                         break;
1837                 default:
1838                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1839                                       header->fsf_status_qual.word[0]);
1840                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1841                                 (char*)header->fsf_status_qual.word, 16);
1842                 }
1843                 break;
1844
1845         case FSF_ELS_COMMAND_REJECTED:
1846                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1847                               "prohibited sending "
1848                               "(adapter: %s, port d_id: 0x%06x)\n",
1849                               zfcp_get_busid_by_adapter(adapter), d_id);
1850
1851                 break;
1852
1853         case FSF_PAYLOAD_SIZE_MISMATCH:
1854                 ZFCP_LOG_INFO(
1855                         "ELS request size and ELS response size must be either "
1856                         "both 0, or both greater than 0 "
1857                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1858                         zfcp_get_busid_by_adapter(adapter),
1859                         bottom->req_buf_length,
1860                         bottom->resp_buf_length);
1861                 break;
1862
1863         case FSF_REQUEST_SIZE_TOO_LARGE:
1864                 ZFCP_LOG_INFO(
1865                         "Length of the ELS request buffer, "
1866                         "specified in QTCB bottom, "
1867                         "exceeds the size of the buffers "
1868                         "that have been allocated for ELS request data "
1869                         "(adapter: %s, req_buf_length=%d)\n",
1870                         zfcp_get_busid_by_adapter(adapter),
1871                         bottom->req_buf_length);
1872                 break;
1873
1874         case FSF_RESPONSE_SIZE_TOO_LARGE:
1875                 ZFCP_LOG_INFO(
1876                         "Length of the ELS response buffer, "
1877                         "specified in QTCB bottom, "
1878                         "exceeds the size of the buffers "
1879                         "that have been allocated for ELS response data "
1880                         "(adapter: %s, resp_buf_length=%d)\n",
1881                         zfcp_get_busid_by_adapter(adapter),
1882                         bottom->resp_buf_length);
1883                 break;
1884
1885         case FSF_SBAL_MISMATCH:
1886                 /* should never occure, avoided in zfcp_fsf_send_els */
1887                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1888                               "resp_buf_length=%d)\n",
1889                               zfcp_get_busid_by_adapter(adapter),
1890                               bottom->req_buf_length, bottom->resp_buf_length);
1891                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1892                 break;
1893
1894         case FSF_ACCESS_DENIED:
1895                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1896                                 "(adapter %s, port d_id=0x%06x)\n",
1897                                 zfcp_get_busid_by_adapter(adapter), d_id);
1898                 for (counter = 0; counter < 2; counter++) {
1899                         subtable = header->fsf_status_qual.halfword[counter * 2];
1900                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1901                         switch (subtable) {
1902                         case FSF_SQ_CFDC_SUBTABLE_OS:
1903                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1904                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1905                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1906                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1907                                         zfcp_act_subtable_type[subtable], rule);
1908                                 break;
1909                         }
1910                 }
1911                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1912                 if (port != NULL)
1913                         zfcp_erp_port_access_denied(port);
1914                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1915                 break;
1916
1917         default:
1918                 ZFCP_LOG_NORMAL(
1919                         "bug: An unknown FSF Status was presented "
1920                         "(adapter: %s, fsf_status=0x%08x)\n",
1921                         zfcp_get_busid_by_adapter(adapter),
1922                         header->fsf_status);
1923                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval");
1924                 debug_exception(adapter->erp_dbf, 0,
1925                         &header->fsf_status_qual.word[0], sizeof(u32));
1926                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1927                 break;
1928         }
1929
1930 skip_fsfstatus:
1931         send_els->status = retval;
1932
1933         if (send_els->handler != 0)
1934                 send_els->handler(send_els->handler_data);
1935
1936         return retval;
1937 }
1938
1939 int
1940 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1941 {
1942         volatile struct qdio_buffer_element *sbale;
1943         struct zfcp_fsf_req *fsf_req;
1944         unsigned long lock_flags;
1945         int retval = 0;
1946
1947         /* setup new FSF request */
1948         retval = zfcp_fsf_req_create(erp_action->adapter,
1949                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1950                                      ZFCP_REQ_AUTO_CLEANUP,
1951                                      erp_action->adapter->pool.fsf_req_erp,
1952                                      &lock_flags, &fsf_req);
1953         if (retval < 0) {
1954                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1955                               "data request for adapter %s.\n",
1956                               zfcp_get_busid_by_adapter(erp_action->adapter));
1957                 goto out;
1958         }
1959
1960         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1961         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1962         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1963
1964         fsf_req->qtcb->bottom.config.feature_selection =
1965                         FSF_FEATURE_CFDC |
1966                         FSF_FEATURE_LUN_SHARING |
1967                         FSF_FEATURE_NOTIFICATION_LOST |
1968                         FSF_FEATURE_UPDATE_ALERT;
1969         fsf_req->erp_action = erp_action;
1970         erp_action->fsf_req = fsf_req;
1971
1972         zfcp_erp_start_timer(fsf_req);
1973         retval = zfcp_fsf_req_send(fsf_req);
1974         if (retval) {
1975                 ZFCP_LOG_INFO
1976                     ("error: Could not send exchange configuration data "
1977                      "command on the adapter %s\n",
1978                      zfcp_get_busid_by_adapter(erp_action->adapter));
1979                 zfcp_fsf_req_free(fsf_req);
1980                 erp_action->fsf_req = NULL;
1981                 goto out;
1982         }
1983
1984         ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1985                        "(adapter %s)\n",
1986                        zfcp_get_busid_by_adapter(erp_action->adapter));
1987
1988  out:
1989         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
1990                                 lock_flags);
1991         return retval;
1992 }
1993
1994 /**
1995  * zfcp_fsf_exchange_config_evaluate
1996  * @fsf_req: fsf_req which belongs to xchg config data request
1997  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1998  *
1999  * returns: -EIO on error, 0 otherwise
2000  */
2001 static int
2002 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
2003 {
2004         struct fsf_qtcb_bottom_config *bottom;
2005         struct zfcp_adapter *adapter = fsf_req->adapter;
2006         struct Scsi_Host *shost = adapter->scsi_host;
2007
2008         bottom = &fsf_req->qtcb->bottom.config;
2009         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
2010                        bottom->low_qtcb_version, bottom->high_qtcb_version);
2011         adapter->fsf_lic_version = bottom->lic_version;
2012         adapter->adapter_features = bottom->adapter_features;
2013         adapter->connection_features = bottom->connection_features;
2014         adapter->peer_wwpn = 0;
2015         adapter->peer_wwnn = 0;
2016         adapter->peer_d_id = 0;
2017
2018         if (xchg_ok) {
2019                 fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
2020                 fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
2021                 fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
2022                 fc_host_speed(shost) = bottom->fc_link_speed;
2023                 fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
2024                 adapter->hydra_version = bottom->adapter_type;
2025                 if (fc_host_permanent_port_name(shost) == -1)
2026                         fc_host_permanent_port_name(shost) =
2027                                 fc_host_port_name(shost);
2028                 if (bottom->fc_topology == FSF_TOPO_P2P) {
2029                         adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2030                         adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2031                         adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2032                         fc_host_port_type(shost) = FC_PORTTYPE_PTP;
2033                 } else if (bottom->fc_topology == FSF_TOPO_FABRIC)
2034                         fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
2035                 else if (bottom->fc_topology == FSF_TOPO_AL)
2036                         fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
2037                 else
2038                         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2039         } else {
2040                 fc_host_node_name(shost) = 0;
2041                 fc_host_port_name(shost) = 0;
2042                 fc_host_port_id(shost) = 0;
2043                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
2044                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2045                 adapter->hydra_version = 0;
2046         }
2047
2048         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
2049                 adapter->hardware_version = bottom->hardware_version;
2050                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
2051                        min(FC_SERIAL_NUMBER_SIZE, 17));
2052                 EBCASC(fc_host_serial_number(shost),
2053                        min(FC_SERIAL_NUMBER_SIZE, 17));
2054         }
2055
2056         ZFCP_LOG_NORMAL("The adapter %s reported the following characteristics:\n"
2057                         "WWNN 0x%016Lx, "
2058                         "WWPN 0x%016Lx, "
2059                         "S_ID 0x%06x,\n"
2060                         "adapter version 0x%x, "
2061                         "LIC version 0x%x, "
2062                         "FC link speed %d Gb/s\n",
2063                         zfcp_get_busid_by_adapter(adapter),
2064                         (wwn_t) fc_host_node_name(shost),
2065                         (wwn_t) fc_host_port_name(shost),
2066                         fc_host_port_id(shost),
2067                         adapter->hydra_version,
2068                         adapter->fsf_lic_version,
2069                         fc_host_speed(shost));
2070         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2071                 ZFCP_LOG_NORMAL("error: the adapter %s "
2072                                 "only supports newer control block "
2073                                 "versions in comparison to this device "
2074                                 "driver (try updated device driver)\n",
2075                                 zfcp_get_busid_by_adapter(adapter));
2076                 debug_text_event(adapter->erp_dbf, 0, "low_qtcb_ver");
2077                 zfcp_erp_adapter_shutdown(adapter, 0);
2078                 return -EIO;
2079         }
2080         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2081                 ZFCP_LOG_NORMAL("error: the adapter %s "
2082                                 "only supports older control block "
2083                                 "versions than this device driver uses"
2084                                 "(consider a microcode upgrade)\n",
2085                                 zfcp_get_busid_by_adapter(adapter));
2086                 debug_text_event(adapter->erp_dbf, 0, "high_qtcb_ver");
2087                 zfcp_erp_adapter_shutdown(adapter, 0);
2088                 return -EIO;
2089         }
2090         return 0;
2091 }
2092
2093 /*
2094  * function:    zfcp_fsf_exchange_config_data_handler
2095  *
2096  * purpose:     is called for finished Exchange Configuration Data command
2097  *
2098  * returns:
2099  */
2100 static int
2101 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2102 {
2103         struct fsf_qtcb_bottom_config *bottom;
2104         struct zfcp_adapter *adapter = fsf_req->adapter;
2105         struct fsf_qtcb *qtcb = fsf_req->qtcb;
2106
2107         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2108                 return -EIO;
2109
2110         switch (qtcb->header.fsf_status) {
2111
2112         case FSF_GOOD:
2113                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2114                         return -EIO;
2115
2116                 switch (fc_host_port_type(adapter->scsi_host)) {
2117                 case FC_PORTTYPE_PTP:
2118                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2119                                         "configuration detected at adapter %s\n"
2120                                         "Peer WWNN 0x%016llx, "
2121                                         "peer WWPN 0x%016llx, "
2122                                         "peer d_id 0x%06x\n",
2123                                         zfcp_get_busid_by_adapter(adapter),
2124                                         adapter->peer_wwnn,
2125                                         adapter->peer_wwpn,
2126                                         adapter->peer_d_id);
2127                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2128                                          "top-p-to-p");
2129                         break;
2130                 case FC_PORTTYPE_NLPORT:
2131                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2132                                         "topology detected at adapter %s "
2133                                         "unsupported, shutting down adapter\n",
2134                                         zfcp_get_busid_by_adapter(adapter));
2135                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2136                                          "top-al");
2137                         zfcp_erp_adapter_shutdown(adapter, 0);
2138                         return -EIO;
2139                 case FC_PORTTYPE_NPORT:
2140                         ZFCP_LOG_NORMAL("Switched fabric fibrechannel "
2141                                       "network detected at adapter %s.\n",
2142                                       zfcp_get_busid_by_adapter(adapter));
2143                         break;
2144                 default:
2145                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2146                                         "reported by the exchange "
2147                                         "configuration command for "
2148                                         "the adapter %s is not "
2149                                         "of a type known to the zfcp "
2150                                         "driver, shutting down adapter\n",
2151                                         zfcp_get_busid_by_adapter(adapter));
2152                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2153                                              "unknown-topo");
2154                         zfcp_erp_adapter_shutdown(adapter, 0);
2155                         return -EIO;
2156                 }
2157                 bottom = &qtcb->bottom.config;
2158                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2159                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2160                                         "allowed by the adapter %s "
2161                                         "is lower than the minimum "
2162                                         "required by the driver (%ld bytes).\n",
2163                                         bottom->max_qtcb_size,
2164                                         zfcp_get_busid_by_adapter(adapter),
2165                                         sizeof(struct fsf_qtcb));
2166                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2167                                          "qtcb-size");
2168                         debug_event(fsf_req->adapter->erp_dbf, 0,
2169                                     &bottom->max_qtcb_size, sizeof (u32));
2170                         zfcp_erp_adapter_shutdown(adapter, 0);
2171                         return -EIO;
2172                 }
2173                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2174                                 &adapter->status);
2175                 break;
2176         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2177                 debug_text_event(adapter->erp_dbf, 0, "xchg-inco");
2178
2179                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2180                         return -EIO;
2181
2182                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
2183
2184                 zfcp_fsf_link_down_info_eval(adapter,
2185                         &qtcb->header.fsf_status_qual.link_down_info);
2186                 break;
2187         default:
2188                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf-stat-ng");
2189                 debug_event(fsf_req->adapter->erp_dbf, 0,
2190                             &fsf_req->qtcb->header.fsf_status, sizeof (u32));
2191                 zfcp_erp_adapter_shutdown(adapter, 0);
2192                 return -EIO;
2193         }
2194         return 0;
2195 }
2196
2197 /**
2198  * zfcp_fsf_exchange_port_data - request information about local port
2199  * @erp_action: ERP action for the adapter for which port data is requested
2200  * @adapter: for which port data is requested
2201  * @data: response to exchange port data request
2202  */
2203 int
2204 zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action,
2205                             struct zfcp_adapter *adapter,
2206                             struct fsf_qtcb_bottom_port *data)
2207 {
2208         volatile struct qdio_buffer_element *sbale;
2209         struct zfcp_fsf_req *fsf_req;
2210         unsigned long lock_flags;
2211         int retval = 0;
2212
2213         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2214                 ZFCP_LOG_INFO("error: exchange port data "
2215                               "command not supported by adapter %s\n",
2216                               zfcp_get_busid_by_adapter(adapter));
2217                 return -EOPNOTSUPP;
2218         }
2219
2220         /* setup new FSF request */
2221         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2222                                      erp_action ? ZFCP_REQ_AUTO_CLEANUP : 0,
2223                                      NULL, &lock_flags, &fsf_req);
2224         if (retval < 0) {
2225                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2226                               "exchange port data request for"
2227                               "the adapter %s.\n",
2228                               zfcp_get_busid_by_adapter(adapter));
2229                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2230                                         lock_flags);
2231                 return retval;
2232         }
2233
2234         if (data)
2235                 fsf_req->data = (unsigned long) data;
2236
2237         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2238         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2239         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2240
2241         if (erp_action) {
2242                 erp_action->fsf_req = fsf_req;
2243                 fsf_req->erp_action = erp_action;
2244                 zfcp_erp_start_timer(fsf_req);
2245         } else
2246                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
2247
2248         retval = zfcp_fsf_req_send(fsf_req);
2249         if (retval) {
2250                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2251                               "command on the adapter %s\n",
2252                               zfcp_get_busid_by_adapter(adapter));
2253                 zfcp_fsf_req_free(fsf_req);
2254                 if (erp_action)
2255                         erp_action->fsf_req = NULL;
2256                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2257                                         lock_flags);
2258                 return retval;
2259         }
2260
2261         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2262
2263         if (!erp_action) {
2264                 wait_event(fsf_req->completion_wq,
2265                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2266                 zfcp_fsf_req_free(fsf_req);
2267         }
2268         return retval;
2269 }
2270
2271 /**
2272  * zfcp_fsf_exchange_port_evaluate
2273  * @fsf_req: fsf_req which belongs to xchg port data request
2274  * @xchg_ok: specifies if xchg port data was incomplete or complete (0/1)
2275  */
2276 static void
2277 zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
2278 {
2279         struct zfcp_adapter *adapter;
2280         struct fsf_qtcb *qtcb;
2281         struct fsf_qtcb_bottom_port *bottom, *data;
2282         struct Scsi_Host *shost;
2283
2284         adapter = fsf_req->adapter;
2285         qtcb = fsf_req->qtcb;
2286         bottom = &qtcb->bottom.port;
2287         shost = adapter->scsi_host;
2288
2289         data = (struct fsf_qtcb_bottom_port*) fsf_req->data;
2290         if (data)
2291                 memcpy(data, bottom, sizeof(struct fsf_qtcb_bottom_port));
2292
2293         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
2294                 fc_host_permanent_port_name(shost) = bottom->wwpn;
2295         else
2296                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
2297         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
2298         fc_host_supported_speeds(shost) = bottom->supported_speed;
2299 }
2300
2301 /**
2302  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2303  * @fsf_req: pointer to struct zfcp_fsf_req
2304  */
2305 static void
2306 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2307 {
2308         struct zfcp_adapter *adapter;
2309         struct fsf_qtcb *qtcb;
2310
2311         adapter = fsf_req->adapter;
2312         qtcb = fsf_req->qtcb;
2313
2314         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2315                 return;
2316
2317         switch (qtcb->header.fsf_status) {
2318         case FSF_GOOD:
2319                 zfcp_fsf_exchange_port_evaluate(fsf_req, 1);
2320                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2321                 break;
2322         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2323                 zfcp_fsf_exchange_port_evaluate(fsf_req, 0);
2324                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2325                 zfcp_fsf_link_down_info_eval(adapter,
2326                         &qtcb->header.fsf_status_qual.link_down_info);
2327                 break;
2328         default:
2329                 debug_text_event(adapter->erp_dbf, 0, "xchg-port-ng");
2330                 debug_event(adapter->erp_dbf, 0,
2331                             &fsf_req->qtcb->header.fsf_status, sizeof(u32));
2332         }
2333 }
2334
2335
2336 /*
2337  * function:    zfcp_fsf_open_port
2338  *
2339  * purpose:
2340  *
2341  * returns:     address of initiated FSF request
2342  *              NULL - request could not be initiated
2343  */
2344 int
2345 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2346 {
2347         volatile struct qdio_buffer_element *sbale;
2348         struct zfcp_fsf_req *fsf_req;
2349         unsigned long lock_flags;
2350         int retval = 0;
2351
2352         /* setup new FSF request */
2353         retval = zfcp_fsf_req_create(erp_action->adapter,
2354                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2355                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2356                                      erp_action->adapter->pool.fsf_req_erp,
2357                                      &lock_flags, &fsf_req);
2358         if (retval < 0) {
2359                 ZFCP_LOG_INFO("error: Could not create open port request "
2360                               "for port 0x%016Lx on adapter %s.\n",
2361                               erp_action->port->wwpn,
2362                               zfcp_get_busid_by_adapter(erp_action->adapter));
2363                 goto out;
2364         }
2365
2366         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2367         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2368         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2369
2370         fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2371         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2372         fsf_req->data = (unsigned long) erp_action->port;
2373         fsf_req->erp_action = erp_action;
2374         erp_action->fsf_req = fsf_req;
2375
2376         zfcp_erp_start_timer(fsf_req);
2377         retval = zfcp_fsf_req_send(fsf_req);
2378         if (retval) {
2379                 ZFCP_LOG_INFO("error: Could not send open port request for "
2380                               "port 0x%016Lx on adapter %s.\n",
2381                               erp_action->port->wwpn,
2382                               zfcp_get_busid_by_adapter(erp_action->adapter));
2383                 zfcp_fsf_req_free(fsf_req);
2384                 erp_action->fsf_req = NULL;
2385                 goto out;
2386         }
2387
2388         ZFCP_LOG_DEBUG("open port request initiated "
2389                        "(adapter %s,  port 0x%016Lx)\n",
2390                        zfcp_get_busid_by_adapter(erp_action->adapter),
2391                        erp_action->port->wwpn);
2392  out:
2393         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2394                                 lock_flags);
2395         return retval;
2396 }
2397
2398 /*
2399  * function:    zfcp_fsf_open_port_handler
2400  *
2401  * purpose:     is called for finished Open Port command
2402  *
2403  * returns:
2404  */
2405 static int
2406 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2407 {
2408         int retval = -EINVAL;
2409         struct zfcp_port *port;
2410         struct fsf_plogi *plogi;
2411         struct fsf_qtcb_header *header;
2412         u16 subtable, rule, counter;
2413
2414         port = (struct zfcp_port *) fsf_req->data;
2415         header = &fsf_req->qtcb->header;
2416
2417         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2418                 /* don't change port status in our bookkeeping */
2419                 goto skip_fsfstatus;
2420         }
2421
2422         /* evaluate FSF status in QTCB */
2423         switch (header->fsf_status) {
2424
2425         case FSF_PORT_ALREADY_OPEN:
2426                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2427                                 "is already open.\n",
2428                                 port->wwpn, zfcp_get_busid_by_port(port));
2429                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2430                                      "fsf_s_popen");
2431                 /*
2432                  * This is a bug, however operation should continue normally
2433                  * if it is simply ignored
2434                  */
2435                 break;
2436
2437         case FSF_ACCESS_DENIED:
2438                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2439                                 "on adapter %s\n",
2440                                 port->wwpn, zfcp_get_busid_by_port(port));
2441                 for (counter = 0; counter < 2; counter++) {
2442                         subtable = header->fsf_status_qual.halfword[counter * 2];
2443                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2444                         switch (subtable) {
2445                         case FSF_SQ_CFDC_SUBTABLE_OS:
2446                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2447                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2448                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2449                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2450                                         zfcp_act_subtable_type[subtable], rule);
2451                                 break;
2452                         }
2453                 }
2454                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2455                 zfcp_erp_port_access_denied(port);
2456                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2457                 break;
2458
2459         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2460                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2461                               "The remote port 0x%016Lx on adapter %s "
2462                               "could not be opened. Disabling it.\n",
2463                               port->wwpn, zfcp_get_busid_by_port(port));
2464                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2465                                  "fsf_s_max_ports");
2466                 zfcp_erp_port_failed(port);
2467                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2468                 break;
2469
2470         case FSF_ADAPTER_STATUS_AVAILABLE:
2471                 switch (header->fsf_status_qual.word[0]) {
2472                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2473                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2474                                          "fsf_sq_ltest");
2475                         /* ERP strategy will escalate */
2476                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2477                         break;
2478                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2479                         /* ERP strategy will escalate */
2480                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2481                                          "fsf_sq_ulp");
2482                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2483                         break;
2484                 case FSF_SQ_NO_RETRY_POSSIBLE:
2485                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2486                                         "adapter %s could not be opened. "
2487                                         "Disabling it.\n",
2488                                         port->wwpn,
2489                                         zfcp_get_busid_by_port(port));
2490                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2491                                              "fsf_sq_no_retry");
2492                         zfcp_erp_port_failed(port);
2493                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2494                         break;
2495                 default:
2496                         ZFCP_LOG_NORMAL
2497                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2498                              header->fsf_status_qual.word[0]);
2499                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2500                                          "fsf_sq_inval:");
2501                         debug_exception(
2502                                 fsf_req->adapter->erp_dbf, 0,
2503                                 &header->fsf_status_qual.word[0],
2504                                 sizeof (u32));
2505                         break;
2506                 }
2507                 break;
2508
2509         case FSF_GOOD:
2510                 /* save port handle assigned by FSF */
2511                 port->handle = header->port_handle;
2512                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2513                               "was opened, it's port handle is 0x%x\n",
2514                               port->wwpn, zfcp_get_busid_by_port(port),
2515                               port->handle);
2516                 /* mark port as open */
2517                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2518                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2519                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2520                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2521                                   &port->status);
2522                 retval = 0;
2523                 /* check whether D_ID has changed during open */
2524                 /*
2525                  * FIXME: This check is not airtight, as the FCP channel does
2526                  * not monitor closures of target port connections caused on
2527                  * the remote side. Thus, they might miss out on invalidating
2528                  * locally cached WWPNs (and other N_Port parameters) of gone
2529                  * target ports. So, our heroic attempt to make things safe
2530                  * could be undermined by 'open port' response data tagged with
2531                  * obsolete WWPNs. Another reason to monitor potential
2532                  * connection closures ourself at least (by interpreting
2533                  * incoming ELS' and unsolicited status). It just crosses my
2534                  * mind that one should be able to cross-check by means of
2535                  * another GID_PN straight after a port has been opened.
2536                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2537                  */
2538                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2539                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2540                 {
2541                         if (fsf_req->qtcb->bottom.support.els1_length <
2542                             sizeof (struct fsf_plogi)) {
2543                                 ZFCP_LOG_INFO(
2544                                         "warning: insufficient length of "
2545                                         "PLOGI payload (%i)\n",
2546                                         fsf_req->qtcb->bottom.support.els1_length);
2547                                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
2548                                                  "fsf_s_short_plogi:");
2549                                 /* skip sanity check and assume wwpn is ok */
2550                         } else {
2551                                 if (plogi->serv_param.wwpn != port->wwpn) {
2552                                         ZFCP_LOG_INFO("warning: d_id of port "
2553                                                       "0x%016Lx changed during "
2554                                                       "open\n", port->wwpn);
2555                                         debug_text_event(
2556                                                 fsf_req->adapter->erp_dbf, 0,
2557                                                 "fsf_s_did_change:");
2558                                         atomic_clear_mask(
2559                                                 ZFCP_STATUS_PORT_DID_DID,
2560                                                 &port->status);
2561                                 } else {
2562                                         port->wwnn = plogi->serv_param.wwnn;
2563                                         zfcp_plogi_evaluate(port, plogi);
2564                                 }
2565                         }
2566                 }
2567                 break;
2568
2569         case FSF_UNKNOWN_OP_SUBTYPE:
2570                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2571                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2572                               "op_subtype=0x%x)\n",
2573                               zfcp_get_busid_by_port(port),
2574                               fsf_req->qtcb->bottom.support.operation_subtype);
2575                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2576                 break;
2577
2578         default:
2579                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2580                                 "(debug info 0x%x)\n",
2581                                 header->fsf_status);
2582                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2583                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2584                                 &header->fsf_status, sizeof (u32));
2585                 break;
2586         }
2587
2588  skip_fsfstatus:
2589         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2590         return retval;
2591 }
2592
2593 /*
2594  * function:    zfcp_fsf_close_port
2595  *
2596  * purpose:     submit FSF command "close port"
2597  *
2598  * returns:     address of initiated FSF request
2599  *              NULL - request could not be initiated
2600  */
2601 int
2602 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2603 {
2604         volatile struct qdio_buffer_element *sbale;
2605         struct zfcp_fsf_req *fsf_req;
2606         unsigned long lock_flags;
2607         int retval = 0;
2608
2609         /* setup new FSF request */
2610         retval = zfcp_fsf_req_create(erp_action->adapter,
2611                                      FSF_QTCB_CLOSE_PORT,
2612                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2613                                      erp_action->adapter->pool.fsf_req_erp,
2614                                      &lock_flags, &fsf_req);
2615         if (retval < 0) {
2616                 ZFCP_LOG_INFO("error: Could not create a close port request "
2617                               "for port 0x%016Lx on adapter %s.\n",
2618                               erp_action->port->wwpn,
2619                               zfcp_get_busid_by_adapter(erp_action->adapter));
2620                 goto out;
2621         }
2622
2623         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2624         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2625         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2626
2627         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2628         fsf_req->data = (unsigned long) erp_action->port;
2629         fsf_req->erp_action = erp_action;
2630         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2631         fsf_req->erp_action = erp_action;
2632         erp_action->fsf_req = fsf_req;
2633
2634         zfcp_erp_start_timer(fsf_req);
2635         retval = zfcp_fsf_req_send(fsf_req);
2636         if (retval) {
2637                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2638                               "port 0x%016Lx on adapter %s.\n",
2639                               erp_action->port->wwpn,
2640                               zfcp_get_busid_by_adapter(erp_action->adapter));
2641                 zfcp_fsf_req_free(fsf_req);
2642                 erp_action->fsf_req = NULL;
2643                 goto out;
2644         }
2645
2646         ZFCP_LOG_TRACE("close port request initiated "
2647                        "(adapter %s, port 0x%016Lx)\n",
2648                        zfcp_get_busid_by_adapter(erp_action->adapter),
2649                        erp_action->port->wwpn);
2650  out:
2651         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2652                                 lock_flags);
2653         return retval;
2654 }
2655
2656 /*
2657  * function:    zfcp_fsf_close_port_handler
2658  *
2659  * purpose:     is called for finished Close Port FSF command
2660  *
2661  * returns:
2662  */
2663 static int
2664 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2665 {
2666         int retval = -EINVAL;
2667         struct zfcp_port *port;
2668
2669         port = (struct zfcp_port *) fsf_req->data;
2670
2671         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2672                 /* don't change port status in our bookkeeping */
2673                 goto skip_fsfstatus;
2674         }
2675
2676         /* evaluate FSF status in QTCB */
2677         switch (fsf_req->qtcb->header.fsf_status) {
2678
2679         case FSF_PORT_HANDLE_NOT_VALID:
2680                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2681                               "0x%016Lx on adapter %s invalid. This may happen "
2682                               "occasionally.\n", port->handle,
2683                               port->wwpn, zfcp_get_busid_by_port(port));
2684                 ZFCP_LOG_DEBUG("status qualifier:\n");
2685                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2686                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2687                               sizeof (union fsf_status_qual));
2688                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2689                                  "fsf_s_phand_nv");
2690                 zfcp_erp_adapter_reopen(port->adapter, 0);
2691                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2692                 break;
2693
2694         case FSF_ADAPTER_STATUS_AVAILABLE:
2695                 /* Note: FSF has actually closed the port in this case.
2696                  * The status code is just daft. Fingers crossed for a change
2697                  */
2698                 retval = 0;
2699                 break;
2700
2701         case FSF_GOOD:
2702                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2703                                "port handle 0x%x\n", port->wwpn,
2704                                zfcp_get_busid_by_port(port), port->handle);
2705                 zfcp_erp_modify_port_status(port,
2706                                             ZFCP_STATUS_COMMON_OPEN,
2707                                             ZFCP_CLEAR);
2708                 retval = 0;
2709                 break;
2710
2711         default:
2712                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2713                                 "(debug info 0x%x)\n",
2714                                 fsf_req->qtcb->header.fsf_status);
2715                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2716                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2717                                 &fsf_req->qtcb->header.fsf_status,
2718                                 sizeof (u32));
2719                 break;
2720         }
2721
2722  skip_fsfstatus:
2723         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2724         return retval;
2725 }
2726
2727 /*
2728  * function:    zfcp_fsf_close_physical_port
2729  *
2730  * purpose:     submit FSF command "close physical port"
2731  *
2732  * returns:     address of initiated FSF request
2733  *              NULL - request could not be initiated
2734  */
2735 int
2736 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2737 {
2738         volatile struct qdio_buffer_element *sbale;
2739         struct zfcp_fsf_req *fsf_req;
2740         unsigned long lock_flags;
2741         int retval = 0;
2742
2743         /* setup new FSF request */
2744         retval = zfcp_fsf_req_create(erp_action->adapter,
2745                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2746                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2747                                      erp_action->adapter->pool.fsf_req_erp,
2748                                      &lock_flags, &fsf_req);
2749         if (retval < 0) {
2750                 ZFCP_LOG_INFO("error: Could not create close physical port "
2751                               "request (adapter %s, port 0x%016Lx)\n",
2752                               zfcp_get_busid_by_adapter(erp_action->adapter),
2753                               erp_action->port->wwpn);
2754
2755                 goto out;
2756         }
2757
2758         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2759         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2760         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2761
2762         /* mark port as being closed */
2763         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2764                         &erp_action->port->status);
2765         /* save a pointer to this port */
2766         fsf_req->data = (unsigned long) erp_action->port;
2767         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2768         fsf_req->erp_action = erp_action;
2769         erp_action->fsf_req = fsf_req;
2770
2771         zfcp_erp_start_timer(fsf_req);
2772         retval = zfcp_fsf_req_send(fsf_req);
2773         if (retval) {
2774                 ZFCP_LOG_INFO("error: Could not send close physical port "
2775                               "request (adapter %s, port 0x%016Lx)\n",
2776                               zfcp_get_busid_by_adapter(erp_action->adapter),
2777                               erp_action->port->wwpn);
2778                 zfcp_fsf_req_free(fsf_req);
2779                 erp_action->fsf_req = NULL;
2780                 goto out;
2781         }
2782
2783         ZFCP_LOG_TRACE("close physical port request initiated "
2784                        "(adapter %s, port 0x%016Lx)\n",
2785                        zfcp_get_busid_by_adapter(erp_action->adapter),
2786                        erp_action->port->wwpn);
2787  out:
2788         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2789                                 lock_flags);
2790         return retval;
2791 }
2792
2793 /*
2794  * function:    zfcp_fsf_close_physical_port_handler
2795  *
2796  * purpose:     is called for finished Close Physical Port FSF command
2797  *
2798  * returns:
2799  */
2800 static int
2801 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2802 {
2803         int retval = -EINVAL;
2804         struct zfcp_port *port;
2805         struct zfcp_unit *unit;
2806         struct fsf_qtcb_header *header;
2807         u16 subtable, rule, counter;
2808
2809         port = (struct zfcp_port *) fsf_req->data;
2810         header = &fsf_req->qtcb->header;
2811
2812         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2813                 /* don't change port status in our bookkeeping */
2814                 goto skip_fsfstatus;
2815         }
2816
2817         /* evaluate FSF status in QTCB */
2818         switch (header->fsf_status) {
2819
2820         case FSF_PORT_HANDLE_NOT_VALID:
2821                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2822                               "(adapter %s, port 0x%016Lx). "
2823                               "This may happen occasionally.\n",
2824                               port->handle,
2825                               zfcp_get_busid_by_port(port),
2826                               port->wwpn);
2827                 ZFCP_LOG_DEBUG("status qualifier:\n");
2828                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2829                               (char *) &header->fsf_status_qual,
2830                               sizeof (union fsf_status_qual));
2831                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2832                                  "fsf_s_phand_nv");
2833                 zfcp_erp_adapter_reopen(port->adapter, 0);
2834                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2835                 break;
2836
2837         case FSF_ACCESS_DENIED:
2838                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2839                                 "physical port 0x%016Lx on adapter %s\n",
2840                                 port->wwpn, zfcp_get_busid_by_port(port));
2841                 for (counter = 0; counter < 2; counter++) {
2842                         subtable = header->fsf_status_qual.halfword[counter * 2];
2843                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2844                         switch (subtable) {
2845                         case FSF_SQ_CFDC_SUBTABLE_OS:
2846                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2847                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2848                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2849                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2850                                         zfcp_act_subtable_type[subtable], rule);
2851                                 break;
2852                         }
2853                 }
2854                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2855                 zfcp_erp_port_access_denied(port);
2856                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2857                 break;
2858
2859         case FSF_PORT_BOXED:
2860                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2861                                "%s needs to be reopened but it was attempted "
2862                                "to close it physically.\n",
2863                                port->wwpn,
2864                                zfcp_get_busid_by_port(port));
2865                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_pboxed");
2866                 zfcp_erp_port_boxed(port);
2867                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2868                         ZFCP_STATUS_FSFREQ_RETRY;
2869                 break;
2870
2871         case FSF_ADAPTER_STATUS_AVAILABLE:
2872                 switch (header->fsf_status_qual.word[0]) {
2873                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2874                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2875                                          "fsf_sq_ltest");
2876                         /* This will now be escalated by ERP */
2877                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2878                         break;
2879                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2880                         /* ERP strategy will escalate */
2881                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2882                                          "fsf_sq_ulp");
2883                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2884                         break;
2885                 default:
2886                         ZFCP_LOG_NORMAL
2887                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2888                              header->fsf_status_qual.word[0]);
2889                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2890                                          "fsf_sq_inval:");
2891                         debug_exception(
2892                                 fsf_req->adapter->erp_dbf, 0,
2893                                 &header->fsf_status_qual.word[0], sizeof (u32));
2894                         break;
2895                 }
2896                 break;
2897
2898         case FSF_GOOD:
2899                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2900                                "physically closed, port handle 0x%x\n",
2901                                port->wwpn,
2902                                zfcp_get_busid_by_port(port), port->handle);
2903                 /* can't use generic zfcp_erp_modify_port_status because
2904                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2905                  */
2906                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2907                 list_for_each_entry(unit, &port->unit_list_head, list)
2908                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2909                 retval = 0;
2910                 break;
2911
2912         default:
2913                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2914                                 "(debug info 0x%x)\n",
2915                                 header->fsf_status);
2916                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2917                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2918                                 &header->fsf_status, sizeof (u32));
2919                 break;
2920         }
2921
2922  skip_fsfstatus:
2923         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2924         return retval;
2925 }
2926
2927 /*
2928  * function:    zfcp_fsf_open_unit
2929  *
2930  * purpose:
2931  *
2932  * returns:
2933  *
2934  * assumptions: This routine does not check whether the associated
2935  *              remote port has already been opened. This should be
2936  *              done by calling routines. Otherwise some status
2937  *              may be presented by FSF
2938  */
2939 int
2940 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2941 {
2942         volatile struct qdio_buffer_element *sbale;
2943         struct zfcp_fsf_req *fsf_req;
2944         unsigned long lock_flags;
2945         int retval = 0;
2946
2947         /* setup new FSF request */
2948         retval = zfcp_fsf_req_create(erp_action->adapter,
2949                                      FSF_QTCB_OPEN_LUN,
2950                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2951                                      erp_action->adapter->pool.fsf_req_erp,
2952                                      &lock_flags, &fsf_req);
2953         if (retval < 0) {
2954                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2955                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2956                               erp_action->unit->fcp_lun,
2957                               erp_action->unit->port->wwpn,
2958                               zfcp_get_busid_by_adapter(erp_action->adapter));
2959                 goto out;
2960         }
2961
2962         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2963         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2964         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2965
2966         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2967         fsf_req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
2968         if (!(erp_action->adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2969                 fsf_req->qtcb->bottom.support.option =
2970                         FSF_OPEN_LUN_SUPPRESS_BOXING;
2971         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2972         fsf_req->data = (unsigned long) erp_action->unit;
2973         fsf_req->erp_action = erp_action;
2974         erp_action->fsf_req = fsf_req;
2975
2976         zfcp_erp_start_timer(fsf_req);
2977         retval = zfcp_fsf_req_send(erp_action->fsf_req);
2978         if (retval) {
2979                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2980                               "on the adapter %s, port 0x%016Lx for "
2981                               "unit 0x%016Lx\n",
2982                               zfcp_get_busid_by_adapter(erp_action->adapter),
2983                               erp_action->port->wwpn,
2984                               erp_action->unit->fcp_lun);
2985                 zfcp_fsf_req_free(fsf_req);
2986                 erp_action->fsf_req = NULL;
2987                 goto out;
2988         }
2989
2990         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2991                        "port 0x%016Lx, unit 0x%016Lx)\n",
2992                        zfcp_get_busid_by_adapter(erp_action->adapter),
2993                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2994  out:
2995         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2996                                 lock_flags);
2997         return retval;
2998 }
2999
3000 /*
3001  * function:    zfcp_fsf_open_unit_handler
3002  *
3003  * purpose:     is called for finished Open LUN command
3004  *
3005  * returns:
3006  */
3007 static int
3008 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
3009 {
3010         int retval = -EINVAL;
3011         struct zfcp_adapter *adapter;
3012         struct zfcp_unit *unit;
3013         struct fsf_qtcb_header *header;
3014         struct fsf_qtcb_bottom_support *bottom;
3015         struct fsf_queue_designator *queue_designator;
3016         u16 subtable, rule, counter;
3017         int exclusive, readwrite;
3018
3019         unit = (struct zfcp_unit *) fsf_req->data;
3020
3021         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3022                 /* don't change unit status in our bookkeeping */
3023                 goto skip_fsfstatus;
3024         }
3025
3026         adapter = fsf_req->adapter;
3027         header = &fsf_req->qtcb->header;
3028         bottom = &fsf_req->qtcb->bottom.support;
3029         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
3030
3031         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
3032                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
3033                           ZFCP_STATUS_UNIT_SHARED |
3034                           ZFCP_STATUS_UNIT_READONLY,
3035                           &unit->status);
3036
3037         /* evaluate FSF status in QTCB */
3038         switch (header->fsf_status) {
3039
3040         case FSF_PORT_HANDLE_NOT_VALID:
3041                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
3042                               "for port 0x%016Lx on adapter %s invalid "
3043                               "This may happen occasionally\n",
3044                               unit->port->handle,
3045                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3046                 ZFCP_LOG_DEBUG("status qualifier:\n");
3047                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3048                               (char *) &header->fsf_status_qual,
3049                               sizeof (union fsf_status_qual));
3050                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_ph_nv");
3051                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3052                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3053                 break;
3054
3055         case FSF_LUN_ALREADY_OPEN:
3056                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3057                                 "remote port 0x%016Lx on adapter %s twice.\n",
3058                                 unit->fcp_lun,
3059                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3060                 debug_text_exception(adapter->erp_dbf, 0,
3061                                      "fsf_s_uopen");
3062                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3063                 break;
3064
3065         case FSF_ACCESS_DENIED:
3066                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3067                                 "remote port 0x%016Lx on adapter %s\n",
3068                                 unit->fcp_lun, unit->port->wwpn,
3069                                 zfcp_get_busid_by_unit(unit));
3070                 for (counter = 0; counter < 2; counter++) {
3071                         subtable = header->fsf_status_qual.halfword[counter * 2];
3072                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3073                         switch (subtable) {
3074                         case FSF_SQ_CFDC_SUBTABLE_OS:
3075                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3076                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3077                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3078                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3079                                         zfcp_act_subtable_type[subtable], rule);
3080                                 break;
3081                         }
3082                 }
3083                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
3084                 zfcp_erp_unit_access_denied(unit);
3085                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3086                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3087                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3088                 break;
3089
3090         case FSF_PORT_BOXED:
3091                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3092                                "needs to be reopened\n",
3093                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3094                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
3095                 zfcp_erp_port_boxed(unit->port);
3096                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3097                         ZFCP_STATUS_FSFREQ_RETRY;
3098                 break;
3099
3100         case FSF_LUN_SHARING_VIOLATION:
3101                 if (header->fsf_status_qual.word[0] != 0) {
3102                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3103                                         "with WWPN 0x%Lx "
3104                                         "connected to the adapter %s "
3105                                         "is already in use in LPAR%d, CSS%d\n",
3106                                         unit->fcp_lun,
3107                                         unit->port->wwpn,
3108                                         zfcp_get_busid_by_unit(unit),
3109                                         queue_designator->hla,
3110                                         queue_designator->cssid);
3111                 } else {
3112                         subtable = header->fsf_status_qual.halfword[4];
3113                         rule = header->fsf_status_qual.halfword[5];
3114                         switch (subtable) {
3115                         case FSF_SQ_CFDC_SUBTABLE_OS:
3116                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3117                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3118                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3119                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3120                                                 "remote port with WWPN 0x%Lx "
3121                                                 "connected to the adapter %s "
3122                                                 "is denied (%s rule %d)\n",
3123                                                 unit->fcp_lun,
3124                                                 unit->port->wwpn,
3125                                                 zfcp_get_busid_by_unit(unit),
3126                                                 zfcp_act_subtable_type[subtable],
3127                                                 rule);
3128                                 break;
3129                         }
3130                 }
3131                 ZFCP_LOG_DEBUG("status qualifier:\n");
3132                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3133                               (char *) &header->fsf_status_qual,
3134                               sizeof (union fsf_status_qual));
3135                 debug_text_event(adapter->erp_dbf, 2,
3136                                  "fsf_s_l_sh_vio");
3137                 zfcp_erp_unit_access_denied(unit);
3138                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3139                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3140                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3141                 break;
3142
3143         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3144                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3145                               "There is no handle (temporary port identifier) "
3146                               "available for unit 0x%016Lx on port 0x%016Lx "
3147                               "on adapter %s\n",
3148                               unit->fcp_lun,
3149                               unit->port->wwpn,
3150                               zfcp_get_busid_by_unit(unit));
3151                 debug_text_event(adapter->erp_dbf, 1,
3152                                  "fsf_s_max_units");
3153                 zfcp_erp_unit_failed(unit);
3154                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3155                 break;
3156
3157         case FSF_ADAPTER_STATUS_AVAILABLE:
3158                 switch (header->fsf_status_qual.word[0]) {
3159                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3160                         /* Re-establish link to port */
3161                         debug_text_event(adapter->erp_dbf, 1,
3162                                          "fsf_sq_ltest");
3163                         zfcp_test_link(unit->port);
3164                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3165                         break;
3166                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3167                         /* ERP strategy will escalate */
3168                         debug_text_event(adapter->erp_dbf, 1,
3169                                          "fsf_sq_ulp");
3170                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3171                         break;
3172                 default:
3173                         ZFCP_LOG_NORMAL
3174                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3175                              header->fsf_status_qual.word[0]);
3176                         debug_text_event(adapter->erp_dbf, 0,
3177                                          "fsf_sq_inval:");
3178                         debug_exception(adapter->erp_dbf, 0,
3179                                         &header->fsf_status_qual.word[0],
3180                                 sizeof (u32));
3181                 }
3182                 break;
3183
3184         case FSF_INVALID_COMMAND_OPTION:
3185                 ZFCP_LOG_NORMAL(
3186                         "Invalid option 0x%x has been specified "
3187                         "in QTCB bottom sent to the adapter %s\n",
3188                         bottom->option,
3189                         zfcp_get_busid_by_adapter(adapter));
3190                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3191                 retval = -EINVAL;
3192                 break;
3193
3194         case FSF_GOOD:
3195                 /* save LUN handle assigned by FSF */
3196                 unit->handle = header->lun_handle;
3197                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3198                                "adapter %s opened, port handle 0x%x\n",
3199                                unit->fcp_lun,
3200                                unit->port->wwpn,
3201                                zfcp_get_busid_by_unit(unit),
3202                                unit->handle);
3203                 /* mark unit as open */
3204                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3205
3206                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
3207                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
3208                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
3209                         exclusive = (bottom->lun_access_info &
3210                                         FSF_UNIT_ACCESS_EXCLUSIVE);
3211                         readwrite = (bottom->lun_access_info &
3212                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
3213
3214                         if (!exclusive)
3215                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3216                                                 &unit->status);
3217
3218                         if (!readwrite) {
3219                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3220                                                 &unit->status);
3221                                 ZFCP_LOG_NORMAL("read-only access for unit "
3222                                                 "(adapter %s, wwpn=0x%016Lx, "
3223                                                 "fcp_lun=0x%016Lx)\n",
3224                                                 zfcp_get_busid_by_unit(unit),
3225                                                 unit->port->wwpn,
3226                                                 unit->fcp_lun);
3227                         }
3228
3229                         if (exclusive && !readwrite) {
3230                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3231                                                 "unit not supported\n");
3232                                 zfcp_erp_unit_failed(unit);
3233                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3234                                 zfcp_erp_unit_shutdown(unit, 0);
3235                         } else if (!exclusive && readwrite) {
3236                                 ZFCP_LOG_NORMAL("shared access of read-write "
3237                                                 "unit not supported\n");
3238                                 zfcp_erp_unit_failed(unit);
3239                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3240                                 zfcp_erp_unit_shutdown(unit, 0);
3241                         }
3242                 }
3243
3244                 retval = 0;
3245                 break;
3246
3247         default:
3248                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3249                                 "(debug info 0x%x)\n",
3250                                 header->fsf_status);
3251                 debug_text_event(adapter->erp_dbf, 0, "fsf_s_inval:");
3252                 debug_exception(adapter->erp_dbf, 0,
3253                                 &header->fsf_status, sizeof (u32));
3254                 break;
3255         }
3256
3257  skip_fsfstatus:
3258         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3259         return retval;
3260 }
3261
3262 /*
3263  * function:    zfcp_fsf_close_unit
3264  *
3265  * purpose:
3266  *
3267  * returns:     address of fsf_req - request successfully initiated
3268  *              NULL -
3269  *
3270  * assumptions: This routine does not check whether the associated
3271  *              remote port/lun has already been opened. This should be
3272  *              done by calling routines. Otherwise some status
3273  *              may be presented by FSF
3274  */
3275 int
3276 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3277 {
3278         volatile struct qdio_buffer_element *sbale;
3279         struct zfcp_fsf_req *fsf_req;
3280         unsigned long lock_flags;
3281         int retval = 0;
3282
3283         /* setup new FSF request */
3284         retval = zfcp_fsf_req_create(erp_action->adapter,
3285                                      FSF_QTCB_CLOSE_LUN,
3286                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3287                                      erp_action->adapter->pool.fsf_req_erp,
3288                                      &lock_flags, &fsf_req);
3289         if (retval < 0) {
3290                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3291                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3292                               erp_action->unit->fcp_lun,
3293                               erp_action->port->wwpn,
3294                               zfcp_get_busid_by_adapter(erp_action->adapter));
3295                 goto out;
3296         }
3297
3298         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3299         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3300         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3301
3302         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
3303         fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3304         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3305         fsf_req->data = (unsigned long) erp_action->unit;
3306         fsf_req->erp_action = erp_action;
3307         erp_action->fsf_req = fsf_req;
3308
3309         zfcp_erp_start_timer(fsf_req);
3310         retval = zfcp_fsf_req_send(erp_action->fsf_req);
3311         if (retval) {
3312                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3313                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3314                               erp_action->unit->fcp_lun,
3315                               erp_action->port->wwpn,
3316                               zfcp_get_busid_by_adapter(erp_action->adapter));
3317                 zfcp_fsf_req_free(fsf_req);
3318                 erp_action->fsf_req = NULL;
3319                 goto out;
3320         }
3321
3322         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3323                        "port 0x%016Lx, unit 0x%016Lx)\n",
3324                        zfcp_get_busid_by_adapter(erp_action->adapter),
3325                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3326  out:
3327         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3328                                 lock_flags);
3329         return retval;
3330 }
3331
3332 /*
3333  * function:    zfcp_fsf_close_unit_handler
3334  *
3335  * purpose:     is called for finished Close LUN FSF command
3336  *
3337  * returns:
3338  */
3339 static int
3340 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3341 {
3342         int retval = -EINVAL;
3343         struct zfcp_unit *unit;
3344
3345         unit = (struct zfcp_unit *) fsf_req->data;
3346
3347         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3348                 /* don't change unit status in our bookkeeping */
3349                 goto skip_fsfstatus;
3350         }
3351
3352         /* evaluate FSF status in QTCB */
3353         switch (fsf_req->qtcb->header.fsf_status) {
3354
3355         case FSF_PORT_HANDLE_NOT_VALID:
3356                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3357                               "0x%016Lx on adapter %s invalid. This may "
3358                               "happen in rare circumstances\n",
3359                               unit->port->handle,
3360                               unit->port->wwpn,
3361                               zfcp_get_busid_by_unit(unit));
3362                 ZFCP_LOG_DEBUG("status qualifier:\n");
3363                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3364                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3365                               sizeof (union fsf_status_qual));
3366                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3367                                  "fsf_s_phand_nv");
3368                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3369                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3370                 break;
3371
3372         case FSF_LUN_HANDLE_NOT_VALID:
3373                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3374                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3375                               "invalid. This may happen occasionally.\n",
3376                               unit->handle,
3377                               unit->fcp_lun,
3378                               unit->port->wwpn,
3379                               zfcp_get_busid_by_unit(unit));
3380                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3381                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3382                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3383                               sizeof (union fsf_status_qual));
3384                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3385                                  "fsf_s_lhand_nv");
3386                 zfcp_erp_port_reopen(unit->port, 0);
3387                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3388                 break;
3389
3390         case FSF_PORT_BOXED:
3391                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3392                                "needs to be reopened\n",
3393                                unit->port->wwpn,
3394                                zfcp_get_busid_by_unit(unit));
3395                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3396                 zfcp_erp_port_boxed(unit->port);
3397                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3398                         ZFCP_STATUS_FSFREQ_RETRY;
3399                 break;
3400
3401         case FSF_ADAPTER_STATUS_AVAILABLE:
3402                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3403                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3404                         /* re-establish link to port */
3405                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3406                                          "fsf_sq_ltest");
3407                         zfcp_test_link(unit->port);
3408                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3409                         break;
3410                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3411                         /* ERP strategy will escalate */
3412                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3413                                          "fsf_sq_ulp");
3414                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3415                         break;
3416                 default:
3417                         ZFCP_LOG_NORMAL
3418                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3419                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3420                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3421                                          "fsf_sq_inval:");
3422                         debug_exception(
3423                                 fsf_req->adapter->erp_dbf, 0,
3424                                 &fsf_req->qtcb->header.fsf_status_qual.word[0],
3425                                 sizeof (u32));
3426                         break;
3427                 }
3428                 break;
3429
3430         case FSF_GOOD:
3431                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3432                                "closed, port handle 0x%x\n",
3433                                unit->fcp_lun,
3434                                unit->port->wwpn,
3435                                zfcp_get_busid_by_unit(unit),
3436                                unit->handle);
3437                 /* mark unit as closed */
3438                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3439                 retval = 0;
3440                 break;
3441
3442         default:
3443                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3444                                 "(debug info 0x%x)\n",
3445                                 fsf_req->qtcb->header.fsf_status);
3446                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3447                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3448                                 &fsf_req->qtcb->header.fsf_status,
3449                                 sizeof (u32));
3450                 break;
3451         }
3452
3453  skip_fsfstatus:
3454         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3455         return retval;
3456 }
3457
3458 /**
3459  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3460  * @adapter: adapter where scsi command is issued
3461  * @unit: unit where command is sent to
3462  * @scsi_cmnd: scsi command to be sent
3463  * @timer: timer to be started when request is initiated
3464  * @req_flags: flags for fsf_request
3465  */
3466 int
3467 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3468                                struct zfcp_unit *unit,
3469                                struct scsi_cmnd * scsi_cmnd,
3470                                int use_timer, int req_flags)
3471 {
3472         struct zfcp_fsf_req *fsf_req = NULL;
3473         struct fcp_cmnd_iu *fcp_cmnd_iu;
3474         unsigned int sbtype;
3475         unsigned long lock_flags;
3476         int real_bytes = 0;
3477         int retval = 0;
3478         int mask;
3479
3480         /* setup new FSF request */
3481         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3482                                      adapter->pool.fsf_req_scsi,
3483                                      &lock_flags, &fsf_req);
3484         if (unlikely(retval < 0)) {
3485                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3486                                "for unit 0x%016Lx on port 0x%016Lx on "
3487                                "adapter %s\n",
3488                                unit->fcp_lun,
3489                                unit->port->wwpn,
3490                                zfcp_get_busid_by_adapter(adapter));
3491                 goto failed_req_create;
3492         }
3493
3494         zfcp_unit_get(unit);
3495         fsf_req->unit = unit;
3496
3497         /* associate FSF request with SCSI request (for look up on abort) */
3498         scsi_cmnd->host_scribble = (unsigned char *) fsf_req->req_id;
3499
3500         /* associate SCSI command with FSF request */
3501         fsf_req->data = (unsigned long) scsi_cmnd;
3502
3503         /* set handles of unit and its parent port in QTCB */
3504         fsf_req->qtcb->header.lun_handle = unit->handle;
3505         fsf_req->qtcb->header.port_handle = unit->port->handle;
3506
3507         /* FSF does not define the structure of the FCP_CMND IU */
3508         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3509             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3510
3511         /*
3512          * set depending on data direction:
3513          *      data direction bits in SBALE (SB Type)
3514          *      data direction bits in QTCB
3515          *      data direction bits in FCP_CMND IU
3516          */
3517         switch (scsi_cmnd->sc_data_direction) {
3518         case DMA_NONE:
3519                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3520                 /*
3521                  * FIXME(qdio):
3522                  * what is the correct type for commands
3523                  * without 'real' data buffers?
3524                  */
3525                 sbtype = SBAL_FLAGS0_TYPE_READ;
3526                 break;
3527         case DMA_FROM_DEVICE:
3528                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3529                 sbtype = SBAL_FLAGS0_TYPE_READ;
3530                 fcp_cmnd_iu->rddata = 1;
3531                 break;
3532         case DMA_TO_DEVICE:
3533                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3534                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3535                 fcp_cmnd_iu->wddata = 1;
3536                 break;
3537         case DMA_BIDIRECTIONAL:
3538         default:
3539                 /*
3540                  * dummy, catch this condition earlier
3541                  * in zfcp_scsi_queuecommand
3542                  */
3543                 goto failed_scsi_cmnd;
3544         }
3545
3546         /* set FC service class in QTCB (3 per default) */
3547         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3548
3549         /* set FCP_LUN in FCP_CMND IU in QTCB */
3550         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3551
3552         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3553
3554         /* set task attributes in FCP_CMND IU in QTCB */
3555         if (likely((scsi_cmnd->device->simple_tags) ||
3556                    (atomic_test_mask(mask, &unit->status))))
3557                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3558         else
3559                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3560
3561         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3562         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3563                 fcp_cmnd_iu->add_fcp_cdb_length
3564                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3565                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3566                                "additional FCP_CDB length is 0x%x "
3567                                "(shifted right 2 bits)\n",
3568                                scsi_cmnd->cmd_len,
3569                                fcp_cmnd_iu->add_fcp_cdb_length);
3570         }
3571         /*
3572          * copy SCSI CDB (including additional length, if any) to
3573          * FCP_CDB in FCP_CMND IU in QTCB
3574          */
3575         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3576
3577         /* FCP CMND IU length in QTCB */
3578         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3579                 sizeof (struct fcp_cmnd_iu) +
3580                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3581
3582         /* generate SBALEs from data buffer */
3583         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3584         if (unlikely(real_bytes < 0)) {
3585                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3586                         ZFCP_LOG_DEBUG(
3587                                 "Data did not fit into available buffer(s), "
3588                                "waiting for more...\n");
3589                 retval = -EIO;
3590         } else {
3591                 ZFCP_LOG_NORMAL("error: No truncation implemented but "
3592                                 "required. Shutting down unit "
3593                                 "(adapter %s, port 0x%016Lx, "
3594                                 "unit 0x%016Lx)\n",
3595                                 zfcp_get_busid_by_unit(unit),
3596                                 unit->port->wwpn,
3597                                 unit->fcp_lun);
3598                 zfcp_erp_unit_shutdown(unit, 0);
3599                 retval = -EINVAL;
3600                 }
3601                 goto no_fit;
3602         }
3603
3604         /* set length of FCP data length in FCP_CMND IU in QTCB */
3605         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3606
3607         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3608         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3609                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3610
3611         if (use_timer)
3612                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
3613
3614         retval = zfcp_fsf_req_send(fsf_req);
3615         if (unlikely(retval < 0)) {
3616                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3617                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3618                               zfcp_get_busid_by_adapter(adapter),
3619                               unit->port->wwpn,
3620                               unit->fcp_lun);
3621                 goto send_failed;
3622         }
3623
3624         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3625                        "port 0x%016Lx, unit 0x%016Lx)\n",
3626                        zfcp_get_busid_by_adapter(adapter),
3627                        unit->port->wwpn,
3628                        unit->fcp_lun);
3629         goto success;
3630
3631  send_failed:
3632  no_fit:
3633  failed_scsi_cmnd:
3634         zfcp_unit_put(unit);
3635         zfcp_fsf_req_free(fsf_req);
3636         fsf_req = NULL;
3637         scsi_cmnd->host_scribble = NULL;
3638  success:
3639  failed_req_create:
3640         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3641         return retval;
3642 }
3643
3644 struct zfcp_fsf_req *
3645 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3646                                           struct zfcp_unit *unit,
3647                                           u8 tm_flags, int req_flags)
3648 {
3649         struct zfcp_fsf_req *fsf_req = NULL;
3650         int retval = 0;
3651         struct fcp_cmnd_iu *fcp_cmnd_iu;
3652         unsigned long lock_flags;
3653         volatile struct qdio_buffer_element *sbale;
3654
3655         /* setup new FSF request */
3656         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3657                                      adapter->pool.fsf_req_scsi,
3658                                      &lock_flags, &fsf_req);
3659         if (retval < 0) {
3660                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3661                               "management) request for adapter %s, port "
3662                               " 0x%016Lx, unit 0x%016Lx.\n",
3663                               zfcp_get_busid_by_adapter(adapter),
3664                               unit->port->wwpn, unit->fcp_lun);
3665                 goto out;
3666         }
3667
3668         /*
3669          * Used to decide on proper handler in the return path,
3670          * could be either zfcp_fsf_send_fcp_command_task_handler or
3671          * zfcp_fsf_send_fcp_command_task_management_handler */
3672
3673         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3674
3675         /*
3676          * hold a pointer to the unit being target of this
3677          * task management request
3678          */
3679         fsf_req->data = (unsigned long) unit;
3680
3681         /* set FSF related fields in QTCB */
3682         fsf_req->qtcb->header.lun_handle = unit->handle;
3683         fsf_req->qtcb->header.port_handle = unit->port->handle;
3684         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3685         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3686         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3687                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3688
3689         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3690         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3691         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3692
3693         /* set FCP related fields in FCP_CMND IU in QTCB */
3694         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3695                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3696         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3697         fcp_cmnd_iu->task_management_flags = tm_flags;
3698
3699         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
3700         retval = zfcp_fsf_req_send(fsf_req);
3701         if (retval) {
3702                 ZFCP_LOG_INFO("error: Could not send an FCP-command (task "
3703                               "management) on adapter %s, port 0x%016Lx for "
3704                               "unit LUN 0x%016Lx\n",
3705                               zfcp_get_busid_by_adapter(adapter),
3706                               unit->port->wwpn,
3707                               unit->fcp_lun);
3708                 zfcp_fsf_req_free(fsf_req);
3709                 fsf_req = NULL;
3710                 goto out;
3711         }
3712
3713         ZFCP_LOG_TRACE("Send FCP Command (task management function) initiated "
3714                        "(adapter %s, port 0x%016Lx, unit 0x%016Lx, "
3715                        "tm_flags=0x%x)\n",
3716                        zfcp_get_busid_by_adapter(adapter),
3717                        unit->port->wwpn,
3718                        unit->fcp_lun,
3719                        tm_flags);
3720  out:
3721         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3722         return fsf_req;
3723 }
3724
3725 /*
3726  * function:    zfcp_fsf_send_fcp_command_handler
3727  *
3728  * purpose:     is called for finished Send FCP Command
3729  *
3730  * returns:
3731  */
3732 static int
3733 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3734 {
3735         int retval = -EINVAL;
3736         struct zfcp_unit *unit;
3737         struct fsf_qtcb_header *header;
3738         u16 subtable, rule, counter;
3739
3740         header = &fsf_req->qtcb->header;
3741
3742         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3743                 unit = (struct zfcp_unit *) fsf_req->data;
3744         else
3745                 unit = fsf_req->unit;
3746
3747         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3748                 /* go directly to calls of special handlers */
3749                 goto skip_fsfstatus;
3750         }
3751
3752         /* evaluate FSF status in QTCB */
3753         switch (header->fsf_status) {
3754
3755         case FSF_PORT_HANDLE_NOT_VALID:
3756                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3757                               "0x%016Lx on adapter %s invalid\n",
3758                               unit->port->handle,
3759                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3760                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3761                               (char *) &header->fsf_status_qual,
3762                               sizeof (union fsf_status_qual));
3763                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3764                                  "fsf_s_phand_nv");
3765                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3766                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3767                 break;
3768
3769         case FSF_LUN_HANDLE_NOT_VALID:
3770                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3771                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3772                               "invalid. This may happen occasionally.\n",
3773                               unit->handle,
3774                               unit->fcp_lun,
3775                               unit->port->wwpn,
3776                               zfcp_get_busid_by_unit(unit));
3777                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3778                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3779                               (char *) &header->fsf_status_qual,
3780                               sizeof (union fsf_status_qual));
3781                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3782                                  "fsf_s_uhand_nv");
3783                 zfcp_erp_port_reopen(unit->port, 0);
3784                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3785                 break;
3786
3787         case FSF_HANDLE_MISMATCH:
3788                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3789                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3790                                 "unit 0x%016Lx)\n",
3791                                 unit->port->handle,
3792                                 zfcp_get_busid_by_unit(unit),
3793                                 unit->port->wwpn,
3794                                 unit->fcp_lun);
3795                 ZFCP_LOG_NORMAL("status qualifier:\n");
3796                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3797                               (char *) &header->fsf_status_qual,
3798                               sizeof (union fsf_status_qual));
3799                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3800                                  "fsf_s_hand_mis");
3801                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3802                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3803                 break;
3804
3805         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3806                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
3807                               "class %d.\n",
3808                               zfcp_get_busid_by_unit(unit),
3809                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
3810                 /* stop operation for this adapter */
3811                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
3812                                      "fsf_s_class_nsup");
3813                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3814                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3815                 break;
3816
3817         case FSF_FCPLUN_NOT_VALID:
3818                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3819                                 "adapter %s does not have correct unit "
3820                                 "handle 0x%x\n",
3821                                 unit->fcp_lun,
3822                                 unit->port->wwpn,
3823                                 zfcp_get_busid_by_unit(unit),
3824                                 unit->handle);
3825                 ZFCP_LOG_DEBUG("status qualifier:\n");
3826                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3827                               (char *) &header->fsf_status_qual,
3828                               sizeof (union fsf_status_qual));
3829                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3830                                  "fsf_s_fcp_lun_nv");
3831                 zfcp_erp_port_reopen(unit->port, 0);
3832                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3833                 break;
3834
3835         case FSF_ACCESS_DENIED:
3836                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3837                                 "unit 0x%016Lx on port 0x%016Lx on "
3838                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3839                                 zfcp_get_busid_by_unit(unit));
3840                 for (counter = 0; counter < 2; counter++) {
3841                         subtable = header->fsf_status_qual.halfword[counter * 2];
3842                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3843                         switch (subtable) {
3844                         case FSF_SQ_CFDC_SUBTABLE_OS:
3845                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3846                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3847                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3848                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3849                                         zfcp_act_subtable_type[subtable], rule);
3850                                 break;
3851                         }
3852                 }
3853                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
3854                 zfcp_erp_unit_access_denied(unit);
3855                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3856                 break;
3857
3858         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3859                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3860                               "0x%016Lx on port 0x%016Lx on adapter %s "
3861                               "(debug info %d)\n",
3862                               unit->fcp_lun,
3863                               unit->port->wwpn,
3864                               zfcp_get_busid_by_unit(unit),
3865                               fsf_req->qtcb->bottom.io.data_direction);
3866                 /* stop operation for this adapter */
3867                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3868                                  "fsf_s_dir_ind_nv");
3869                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3870                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3871                 break;
3872
3873         case FSF_CMND_LENGTH_NOT_VALID:
3874                 ZFCP_LOG_NORMAL
3875                     ("bug: An invalid control-data-block length field "
3876                      "was found in a command for unit 0x%016Lx on port "
3877                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3878                      unit->fcp_lun, unit->port->wwpn,
3879                      zfcp_get_busid_by_unit(unit),
3880                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3881                 /* stop operation for this adapter */
3882                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3883                                  "fsf_s_cmd_len_nv");
3884                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3885                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3886                 break;
3887
3888         case FSF_PORT_BOXED:
3889                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3890                                "needs to be reopened\n",
3891                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3892                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3893                 zfcp_erp_port_boxed(unit->port);
3894                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3895                         ZFCP_STATUS_FSFREQ_RETRY;
3896                 break;
3897
3898         case FSF_LUN_BOXED:
3899                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3900                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3901                                 zfcp_get_busid_by_unit(unit),
3902                                 unit->port->wwpn, unit->fcp_lun);
3903                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
3904                 zfcp_erp_unit_boxed(unit);
3905                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3906                         | ZFCP_STATUS_FSFREQ_RETRY;
3907                 break;
3908
3909         case FSF_ADAPTER_STATUS_AVAILABLE:
3910                 switch (header->fsf_status_qual.word[0]) {
3911                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3912                         /* re-establish link to port */
3913                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3914                                          "fsf_sq_ltest");
3915                         zfcp_test_link(unit->port);
3916                         break;
3917                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3918                         /* FIXME(hw) need proper specs for proper action */
3919                         /* let scsi stack deal with retries and escalation */
3920                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3921                                          "fsf_sq_ulp");
3922                         break;
3923                 default:
3924                         ZFCP_LOG_NORMAL
3925                             ("Unknown status qualifier 0x%x arrived.\n",
3926                              header->fsf_status_qual.word[0]);
3927                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3928                                          "fsf_sq_inval:");
3929                         debug_exception(fsf_req->adapter->erp_dbf, 0,
3930                                         &header->fsf_status_qual.word[0],
3931                                         sizeof(u32));
3932                         break;
3933                 }
3934                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3935                 break;
3936
3937         case FSF_GOOD:
3938                 break;
3939
3940         case FSF_FCP_RSP_AVAILABLE:
3941                 break;
3942
3943         default:
3944                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3945                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3946                                 &header->fsf_status, sizeof(u32));
3947                 break;
3948         }
3949
3950  skip_fsfstatus:
3951         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3952                 retval =
3953                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3954         } else {
3955                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3956                 fsf_req->unit = NULL;
3957                 zfcp_unit_put(unit);
3958         }
3959         return retval;
3960 }
3961
3962 /*
3963  * function:    zfcp_fsf_send_fcp_command_task_handler
3964  *
3965  * purpose:     evaluates FCP_RSP IU
3966  *
3967  * returns:
3968  */
3969 static int
3970 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3971 {
3972         int retval = 0;
3973         struct scsi_cmnd *scpnt;
3974         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3975             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3976         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3977             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3978         u32 sns_len;
3979         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3980         unsigned long flags;
3981         struct zfcp_unit *unit = fsf_req->unit;
3982
3983         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3984         scpnt = (struct scsi_cmnd *) fsf_req->data;
3985         if (unlikely(!scpnt)) {
3986                 ZFCP_LOG_DEBUG
3987                     ("Command with fsf_req %p is not associated to "
3988                      "a scsi command anymore. Aborted?\n", fsf_req);
3989                 goto out;
3990         }
3991         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3992                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3993                  *        DID_SOFT_ERROR by retrying the request for devices
3994                  *        that allow retries.
3995                  */
3996                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3997                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3998                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3999                 goto skip_fsfstatus;
4000         }
4001
4002         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
4003                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
4004                 set_host_byte(&scpnt->result, DID_ERROR);
4005                 goto skip_fsfstatus;
4006         }
4007
4008         /* set message byte of result in SCSI command */
4009         scpnt->result |= COMMAND_COMPLETE << 8;
4010
4011         /*
4012          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
4013          * of result in SCSI command
4014          */
4015         scpnt->result |= fcp_rsp_iu->scsi_status;
4016         if (unlikely(fcp_rsp_iu->scsi_status)) {
4017                 /* DEBUG */
4018                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
4019                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4020                               scpnt->cmnd, scpnt->cmd_len);
4021                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
4022                                 fcp_rsp_iu->scsi_status);
4023                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4024                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
4025                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4026                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
4027                               fcp_rsp_iu->fcp_sns_len);
4028         }
4029
4030         /* check FCP_RSP_INFO */
4031         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
4032                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
4033                 switch (fcp_rsp_info[3]) {
4034                 case RSP_CODE_GOOD:
4035                         /* ok, continue */
4036                         ZFCP_LOG_TRACE("no failure or Task Management "
4037                                        "Function complete\n");
4038                         set_host_byte(&scpnt->result, DID_OK);
4039                         break;
4040                 case RSP_CODE_LENGTH_MISMATCH:
4041                         /* hardware bug */
4042                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4043                                         "that the fibrechannel protocol data "
4044                                         "length differs from the burst length. "
4045                                         "The problem occured on unit 0x%016Lx "
4046                                         "on port 0x%016Lx on adapter %s",
4047                                         unit->fcp_lun,
4048                                         unit->port->wwpn,
4049                                         zfcp_get_busid_by_unit(unit));
4050                         /* dump SCSI CDB as prepared by zfcp */
4051                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4052                                       (char *) &fsf_req->qtcb->
4053                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4054                         set_host_byte(&scpnt->result, DID_ERROR);
4055                         goto skip_fsfstatus;
4056                 case RSP_CODE_FIELD_INVALID:
4057                         /* driver or hardware bug */
4058                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4059                                         "that the fibrechannel protocol data "
4060                                         "fields were incorrectly set up. "
4061                                         "The problem occured on the unit "
4062                                         "0x%016Lx on port 0x%016Lx on "
4063                                         "adapter %s",
4064                                         unit->fcp_lun,
4065                                         unit->port->wwpn,
4066                                         zfcp_get_busid_by_unit(unit));
4067                         /* dump SCSI CDB as prepared by zfcp */
4068                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4069                                       (char *) &fsf_req->qtcb->
4070                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4071                         set_host_byte(&scpnt->result, DID_ERROR);
4072                         goto skip_fsfstatus;
4073                 case RSP_CODE_RO_MISMATCH:
4074                         /* hardware bug */
4075                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
4076                                         "that conflicting  values for the "
4077                                         "fibrechannel payload offset from the "
4078                                         "header were found. "
4079                                         "The problem occured on unit 0x%016Lx "
4080                                         "on port 0x%016Lx on adapter %s.\n",
4081                                         unit->fcp_lun,
4082                                         unit->port->wwpn,
4083                                         zfcp_get_busid_by_unit(unit));
4084                         /* dump SCSI CDB as prepared by zfcp */
4085                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4086                                       (char *) &fsf_req->qtcb->
4087                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4088                         set_host_byte(&scpnt->result, DID_ERROR);
4089                         goto skip_fsfstatus;
4090                 default:
4091                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4092                                         "code was detected for a command. "
4093                                         "The problem occured on the unit "
4094                                         "0x%016Lx on port 0x%016Lx on "
4095                                         "adapter %s (debug info 0x%x)\n",
4096                                         unit->fcp_lun,
4097                                         unit->port->wwpn,
4098                                         zfcp_get_busid_by_unit(unit),
4099                                         fcp_rsp_info[3]);
4100                         /* dump SCSI CDB as prepared by zfcp */
4101                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4102                                       (char *) &fsf_req->qtcb->
4103                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4104                         set_host_byte(&scpnt->result, DID_ERROR);
4105                         goto skip_fsfstatus;
4106                 }
4107         }
4108
4109         /* check for sense data */
4110         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4111                 sns_len = FSF_FCP_RSP_SIZE -
4112                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4113                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4114                                sns_len);
4115                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4116                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4117                                SCSI_SENSE_BUFFERSIZE);
4118                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4119                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4120                                scpnt->result);
4121                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4122                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4123
4124                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4125                                fcp_rsp_iu->fcp_sns_len);
4126                 memcpy(&scpnt->sense_buffer,
4127                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4128                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4129                               (void *) &scpnt->sense_buffer, sns_len);
4130         }
4131
4132         /* check for overrun */
4133         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4134                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4135                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4136                               "The response data length is "
4137                               "%d, the original length was %d.\n",
4138                               unit->fcp_lun,
4139                               unit->port->wwpn,
4140                               zfcp_get_busid_by_unit(unit),
4141                               fcp_rsp_iu->fcp_resid,
4142                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4143         }
4144
4145         /* check for underrun */
4146         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4147                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4148                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4149                               "The response data length is "
4150                               "%d, the original length was %d.\n",
4151                               unit->fcp_lun,
4152                               unit->port->wwpn,
4153                               zfcp_get_busid_by_unit(unit),
4154                               fcp_rsp_iu->fcp_resid,
4155                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4156
4157                 scpnt->resid = fcp_rsp_iu->fcp_resid;
4158                 if (scpnt->request_bufflen - scpnt->resid < scpnt->underflow)
4159                         set_host_byte(&scpnt->result, DID_ERROR);
4160         }
4161
4162  skip_fsfstatus:
4163         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4164
4165         if (scpnt->result != 0)
4166                 zfcp_scsi_dbf_event_result("erro", 3, fsf_req->adapter, scpnt, fsf_req);
4167         else if (scpnt->retries > 0)
4168                 zfcp_scsi_dbf_event_result("retr", 4, fsf_req->adapter, scpnt, fsf_req);
4169         else
4170                 zfcp_scsi_dbf_event_result("norm", 6, fsf_req->adapter, scpnt, fsf_req);
4171
4172         /* cleanup pointer (need this especially for abort) */
4173         scpnt->host_scribble = NULL;
4174
4175         /* always call back */
4176         (scpnt->scsi_done) (scpnt);
4177
4178         /*
4179          * We must hold this lock until scsi_done has been called.
4180          * Otherwise we may call scsi_done after abort regarding this
4181          * command has completed.
4182          * Note: scsi_done must not block!
4183          */
4184  out:
4185         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4186         return retval;
4187 }
4188
4189 /*
4190  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4191  *
4192  * purpose:     evaluates FCP_RSP IU
4193  *
4194  * returns:
4195  */
4196 static int
4197 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4198 {
4199         int retval = 0;
4200         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4201             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4202         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4203         struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
4204
4205         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4206                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4207                 goto skip_fsfstatus;
4208         }
4209
4210         /* check FCP_RSP_INFO */
4211         switch (fcp_rsp_info[3]) {
4212         case RSP_CODE_GOOD:
4213                 /* ok, continue */
4214                 ZFCP_LOG_DEBUG("no failure or Task Management "
4215                                "Function complete\n");
4216                 break;
4217         case RSP_CODE_TASKMAN_UNSUPP:
4218                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4219                                 "is not supported on the target device "
4220                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4221                                 unit->fcp_lun,
4222                                 unit->port->wwpn,
4223                                 zfcp_get_busid_by_unit(unit));
4224                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4225                 break;
4226         case RSP_CODE_TASKMAN_FAILED:
4227                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4228                                 "failed to complete successfully. "
4229                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4230                                 unit->fcp_lun,
4231                                 unit->port->wwpn,
4232                                 zfcp_get_busid_by_unit(unit));
4233                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4234                 break;
4235         default:
4236                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4237                                 "code was detected for a command. "
4238                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4239                                 "(debug info 0x%x)\n",
4240                                 unit->fcp_lun,
4241                                 unit->port->wwpn,
4242                                 zfcp_get_busid_by_unit(unit),
4243                                 fcp_rsp_info[3]);
4244                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4245         }
4246
4247       skip_fsfstatus:
4248         return retval;
4249 }
4250
4251
4252 /*
4253  * function:    zfcp_fsf_control_file
4254  *
4255  * purpose:     Initiator of the control file upload/download FSF requests
4256  *
4257  * returns:     0           - FSF request is successfuly created and queued
4258  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4259  *              -EINVAL     - Invalid direction specified
4260  *              -ENOMEM     - Insufficient memory
4261  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4262  */
4263 int
4264 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4265                       struct zfcp_fsf_req **fsf_req_ptr,
4266                       u32 fsf_command,
4267                       u32 option,
4268                       struct zfcp_sg_list *sg_list)
4269 {
4270         struct zfcp_fsf_req *fsf_req;
4271         struct fsf_qtcb_bottom_support *bottom;
4272         volatile struct qdio_buffer_element *sbale;
4273         unsigned long lock_flags;
4274         int req_flags = 0;
4275         int direction;
4276         int retval = 0;
4277
4278         if (!(adapter->adapter_features & FSF_FEATURE_CFDC)) {
4279                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4280                               zfcp_get_busid_by_adapter(adapter));
4281                 retval = -EOPNOTSUPP;
4282                 goto out;
4283         }
4284
4285         switch (fsf_command) {
4286
4287         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4288                 direction = SBAL_FLAGS0_TYPE_WRITE;
4289                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4290                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4291                         req_flags = ZFCP_WAIT_FOR_SBAL;
4292                 break;
4293
4294         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4295                 direction = SBAL_FLAGS0_TYPE_READ;
4296                 break;
4297
4298         default:
4299                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4300                 retval = -EINVAL;
4301                 goto out;
4302         }
4303
4304         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4305                                      NULL, &lock_flags, &fsf_req);
4306         if (retval < 0) {
4307                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4308                               "adapter %s\n",
4309                         zfcp_get_busid_by_adapter(adapter));
4310                 retval = -EPERM;
4311                 goto unlock_queue_lock;
4312         }
4313
4314         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4315         sbale[0].flags |= direction;
4316
4317         bottom = &fsf_req->qtcb->bottom.support;
4318         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4319         bottom->option = option;
4320
4321         if (sg_list->count > 0) {
4322                 int bytes;
4323
4324                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4325                                                 sg_list->sg, sg_list->count,
4326                                                 ZFCP_MAX_SBALS_PER_REQ);
4327                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4328                         ZFCP_LOG_INFO(
4329                                 "error: Could not create sufficient number of "
4330                                 "SBALS for an FSF request to the adapter %s\n",
4331                                 zfcp_get_busid_by_adapter(adapter));
4332                         retval = -ENOMEM;
4333                         goto free_fsf_req;
4334                 }
4335         } else
4336                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4337
4338         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
4339         retval = zfcp_fsf_req_send(fsf_req);
4340         if (retval < 0) {
4341                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4342                               "(adapter %s)\n",
4343                               zfcp_get_busid_by_adapter(adapter));
4344                 retval = -EPERM;
4345                 goto free_fsf_req;
4346         }
4347         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4348
4349         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4350                         "adapter %s\n",
4351                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4352                         "download" : "upload",
4353                         zfcp_get_busid_by_adapter(adapter));
4354
4355         wait_event(fsf_req->completion_wq,
4356                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4357
4358         *fsf_req_ptr = fsf_req;
4359         goto out;
4360
4361  free_fsf_req:
4362         zfcp_fsf_req_free(fsf_req);
4363  unlock_queue_lock:
4364         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4365  out:
4366         return retval;
4367 }
4368
4369
4370 /*
4371  * function:    zfcp_fsf_control_file_handler
4372  *
4373  * purpose:     Handler of the control file upload/download FSF requests
4374  *
4375  * returns:     0       - FSF request successfuly processed
4376  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4377  *              -EACCES - There is no permission to execute an operation
4378  *              -EPERM  - The control file is not in a right format
4379  *              -EIO    - There is a problem with the FCP adapter
4380  *              -EINVAL - Invalid operation
4381  *              -EFAULT - User space memory I/O operation fault
4382  */
4383 static int
4384 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4385 {
4386         struct zfcp_adapter *adapter = fsf_req->adapter;
4387         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4388         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4389         int retval = 0;
4390
4391         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4392                 retval = -EINVAL;
4393                 goto skip_fsfstatus;
4394         }
4395
4396         switch (header->fsf_status) {
4397
4398         case FSF_GOOD:
4399                 ZFCP_LOG_NORMAL(
4400                         "The FSF request has been successfully completed "
4401                         "on the adapter %s\n",
4402                         zfcp_get_busid_by_adapter(adapter));
4403                 break;
4404
4405         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4406                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4407                         switch (header->fsf_status_qual.word[0]) {
4408
4409                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4410                                 ZFCP_LOG_NORMAL(
4411                                         "CFDC on the adapter %s has being "
4412                                         "hardened on primary and secondary SE\n",
4413                                         zfcp_get_busid_by_adapter(adapter));
4414                                 break;
4415
4416                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4417                                 ZFCP_LOG_NORMAL(
4418                                         "CFDC of the adapter %s could not "
4419                                         "be saved on the SE\n",
4420                                         zfcp_get_busid_by_adapter(adapter));
4421                                 break;
4422
4423                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4424                                 ZFCP_LOG_NORMAL(
4425                                         "CFDC of the adapter %s could not "
4426                                         "be copied to the secondary SE\n",
4427                                         zfcp_get_busid_by_adapter(adapter));
4428                                 break;
4429
4430                         default:
4431                                 ZFCP_LOG_NORMAL(
4432                                         "CFDC could not be hardened "
4433                                         "on the adapter %s\n",
4434                                         zfcp_get_busid_by_adapter(adapter));
4435                         }
4436                 }
4437                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4438                 retval = -EAGAIN;
4439                 break;
4440
4441         case FSF_AUTHORIZATION_FAILURE:
4442                 ZFCP_LOG_NORMAL(
4443                         "Adapter %s does not accept privileged commands\n",
4444                         zfcp_get_busid_by_adapter(adapter));
4445                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4446                 retval = -EACCES;
4447                 break;
4448
4449         case FSF_CFDC_ERROR_DETECTED:
4450                 ZFCP_LOG_NORMAL(
4451                         "Error at position %d in the CFDC, "
4452                         "CFDC is discarded by the adapter %s\n",
4453                         header->fsf_status_qual.word[0],
4454                         zfcp_get_busid_by_adapter(adapter));
4455                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4456                 retval = -EPERM;
4457                 break;
4458
4459         case FSF_CONTROL_FILE_UPDATE_ERROR:
4460                 ZFCP_LOG_NORMAL(
4461                         "Adapter %s cannot harden the control file, "
4462                         "file is discarded\n",
4463                         zfcp_get_busid_by_adapter(adapter));
4464                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4465                 retval = -EIO;
4466                 break;
4467
4468         case FSF_CONTROL_FILE_TOO_LARGE:
4469                 ZFCP_LOG_NORMAL(
4470                         "Control file is too large, file is discarded "
4471                         "by the adapter %s\n",
4472                         zfcp_get_busid_by_adapter(adapter));
4473                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4474                 retval = -EIO;
4475                 break;
4476
4477         case FSF_ACCESS_CONFLICT_DETECTED:
4478                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4479                         ZFCP_LOG_NORMAL(
4480                                 "CFDC has been discarded by the adapter %s, "
4481                                 "because activation would impact "
4482                                 "%d active connection(s)\n",
4483                                 zfcp_get_busid_by_adapter(adapter),
4484                                 header->fsf_status_qual.word[0]);
4485                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4486                 retval = -EIO;
4487                 break;
4488
4489         case FSF_CONFLICTS_OVERRULED:
4490                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4491                         ZFCP_LOG_NORMAL(
4492                                 "CFDC has been activated on the adapter %s, "
4493                                 "but activation has impacted "
4494                                 "%d active connection(s)\n",
4495                                 zfcp_get_busid_by_adapter(adapter),
4496                                 header->fsf_status_qual.word[0]);
4497                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4498                 retval = -EIO;
4499                 break;
4500
4501         case FSF_UNKNOWN_OP_SUBTYPE:
4502                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4503                                 "op_subtype=0x%x)\n",
4504                                 zfcp_get_busid_by_adapter(adapter),
4505                                 bottom->operation_subtype);
4506                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4507                 retval = -EINVAL;
4508                 break;
4509
4510         case FSF_INVALID_COMMAND_OPTION:
4511                 ZFCP_LOG_NORMAL(
4512                         "Invalid option 0x%x has been specified "
4513                         "in QTCB bottom sent to the adapter %s\n",
4514                         bottom->option,
4515                         zfcp_get_busid_by_adapter(adapter));
4516                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4517                 retval = -EINVAL;
4518                 break;
4519
4520         default:
4521                 ZFCP_LOG_NORMAL(
4522                         "bug: An unknown/unexpected FSF status 0x%08x "
4523                         "was presented on the adapter %s\n",
4524                         header->fsf_status,
4525                         zfcp_get_busid_by_adapter(adapter));
4526                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_sq_inval");
4527                 debug_exception(fsf_req->adapter->erp_dbf, 0,
4528                         &header->fsf_status_qual.word[0], sizeof(u32));
4529                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4530                 retval = -EINVAL;
4531                 break;
4532         }
4533
4534 skip_fsfstatus:
4535         return retval;
4536 }
4537
4538 static inline int
4539 zfcp_fsf_req_sbal_check(unsigned long *flags,
4540                         struct zfcp_qdio_queue *queue, int needed)
4541 {
4542         write_lock_irqsave(&queue->queue_lock, *flags);
4543         if (likely(atomic_read(&queue->free_count) >= needed))
4544                 return 1;
4545         write_unlock_irqrestore(&queue->queue_lock, *flags);
4546         return 0;
4547 }
4548
4549 /*
4550  * set qtcb pointer in fsf_req and initialize QTCB
4551  */
4552 static void
4553 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
4554 {
4555         if (likely(fsf_req->qtcb != NULL)) {
4556                 fsf_req->qtcb->prefix.req_seq_no =
4557                         fsf_req->adapter->fsf_req_seq_no;
4558                 fsf_req->qtcb->prefix.req_id = fsf_req->req_id;
4559                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4560                 fsf_req->qtcb->prefix.qtcb_type =
4561                         fsf_qtcb_type[fsf_req->fsf_command];
4562                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4563                 fsf_req->qtcb->header.req_handle = fsf_req->req_id;
4564                 fsf_req->qtcb->header.fsf_command = fsf_req->fsf_command;
4565         }
4566 }
4567
4568 /**
4569  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4570  * @adapter: adapter for which request queue is examined
4571  * @req_flags: flags indicating whether to wait for needed SBAL or not
4572  * @lock_flags: lock_flags if queue_lock is taken
4573  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4574  * Locks: lock adapter->request_queue->queue_lock on success
4575  */
4576 static int
4577 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4578                       unsigned long *lock_flags)
4579 {
4580         long ret;
4581         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4582
4583         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4584                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4585                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4586                                                        ZFCP_SBAL_TIMEOUT);
4587                 if (ret < 0)
4588                         return ret;
4589                 if (!ret)
4590                         return -EIO;
4591         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4592                 return -EIO;
4593
4594         return 0;
4595 }
4596
4597 /*
4598  * function:    zfcp_fsf_req_create
4599  *
4600  * purpose:     create an FSF request at the specified adapter and
4601  *              setup common fields
4602  *
4603  * returns:     -ENOMEM if there was insufficient memory for a request
4604  *              -EIO if no qdio buffers could be allocate to the request
4605  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4606  *              0 in success
4607  *
4608  * note:        The created request is returned by reference.
4609  *
4610  * locks:       lock of concerned request queue must not be held,
4611  *              but is held on completion (write, irqsave)
4612  */
4613 int
4614 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4615                     mempool_t *pool, unsigned long *lock_flags,
4616                     struct zfcp_fsf_req **fsf_req_p)
4617 {
4618         volatile struct qdio_buffer_element *sbale;
4619         struct zfcp_fsf_req *fsf_req = NULL;
4620         int ret = 0;
4621         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4622
4623         /* allocate new FSF request */
4624         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4625         if (unlikely(NULL == fsf_req)) {
4626                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into"
4627                                "the outbound (send) queue.\n");
4628                 ret = -ENOMEM;
4629                 goto failed_fsf_req;
4630         }
4631
4632         fsf_req->adapter = adapter;
4633         fsf_req->fsf_command = fsf_cmd;
4634         INIT_LIST_HEAD(&fsf_req->list);
4635         init_timer(&fsf_req->timer);
4636
4637         /* initialize waitqueue which may be used to wait on
4638            this request completion */
4639         init_waitqueue_head(&fsf_req->completion_wq);
4640
4641         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4642         if (ret < 0)
4643                 goto failed_sbals;
4644
4645         /* this is serialized (we are holding req_queue-lock of adapter) */
4646         if (adapter->req_no == 0)
4647                 adapter->req_no++;
4648         fsf_req->req_id = adapter->req_no++;
4649
4650         zfcp_fsf_req_qtcb_init(fsf_req);
4651
4652         /*
4653          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4654          * if it is not set (see also *_open_qdio and *_close_qdio).
4655          */
4656
4657         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4658                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4659                 ret = -EIO;
4660                 goto failed_sbals;
4661         }
4662
4663         if (fsf_req->qtcb) {
4664                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4665                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4666         }
4667         fsf_req->sbal_number = 1;
4668         fsf_req->sbal_first = req_queue->free_index;
4669         fsf_req->sbal_curr = req_queue->free_index;
4670         fsf_req->sbale_curr = 1;
4671
4672         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4673                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4674         }
4675
4676         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4677
4678         /* setup common SBALE fields */
4679         sbale[0].addr = (void *) fsf_req->req_id;
4680         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4681         if (likely(fsf_req->qtcb != NULL)) {
4682                 sbale[1].addr = (void *) fsf_req->qtcb;
4683                 sbale[1].length = sizeof(struct fsf_qtcb);
4684         }
4685
4686         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4687                        fsf_req->sbal_number, fsf_req->sbal_first);
4688
4689         goto success;
4690
4691  failed_sbals:
4692 /* dequeue new FSF request previously enqueued */
4693         zfcp_fsf_req_free(fsf_req);
4694         fsf_req = NULL;
4695
4696  failed_fsf_req:
4697         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4698  success:
4699         *fsf_req_p = fsf_req;
4700         return ret;
4701 }
4702
4703 /*
4704  * function:    zfcp_fsf_req_send
4705  *
4706  * purpose:     start transfer of FSF request via QDIO
4707  *
4708  * returns:     0 - request transfer succesfully started
4709  *              !0 - start of request transfer failed
4710  */
4711 static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
4712 {
4713         struct zfcp_adapter *adapter;
4714         struct zfcp_qdio_queue *req_queue;
4715         volatile struct qdio_buffer_element *sbale;
4716         int inc_seq_no;
4717         int new_distance_from_int;
4718         u64 dbg_tmp[2];
4719         int retval = 0;
4720
4721         adapter = fsf_req->adapter;
4722         req_queue = &adapter->request_queue,
4723
4724
4725         /* FIXME(debug): remove it later */
4726         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4727         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4728         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4729         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4730                       sbale[1].length);
4731
4732         /* put allocated FSF request into hash table */
4733         spin_lock(&adapter->req_list_lock);
4734         zfcp_reqlist_add(adapter, fsf_req);
4735         spin_unlock(&adapter->req_list_lock);
4736
4737         inc_seq_no = (fsf_req->qtcb != NULL);
4738
4739         ZFCP_LOG_TRACE("request queue of adapter %s: "
4740                        "next free SBAL is %i, %i free SBALs\n",
4741                        zfcp_get_busid_by_adapter(adapter),
4742                        req_queue->free_index,
4743                        atomic_read(&req_queue->free_count));
4744
4745         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4746                        "index_in_queue=%i, count=%i, buffers=%p\n",
4747                        zfcp_get_busid_by_adapter(adapter),
4748                        QDIO_FLAG_SYNC_OUTPUT,
4749                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4750                        &req_queue->buffer[fsf_req->sbal_first]);
4751
4752         /*
4753          * adjust the number of free SBALs in request queue as well as
4754          * position of first one
4755          */
4756         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4757         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4758         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4759         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4760         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4761
4762         fsf_req->issued = get_clock();
4763
4764         retval = do_QDIO(adapter->ccw_device,
4765                          QDIO_FLAG_SYNC_OUTPUT,
4766                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4767
4768         dbg_tmp[0] = (unsigned long) sbale[0].addr;
4769         dbg_tmp[1] = (u64) retval;
4770         debug_event(adapter->erp_dbf, 4, (void *) dbg_tmp, 16);
4771
4772         if (unlikely(retval)) {
4773                 /* Queues are down..... */
4774                 retval = -EIO;
4775                 del_timer(&fsf_req->timer);
4776                 spin_lock(&adapter->req_list_lock);
4777                 zfcp_reqlist_remove(adapter, fsf_req);
4778                 spin_unlock(&adapter->req_list_lock);
4779                 /* undo changes in request queue made for this request */
4780                 zfcp_qdio_zero_sbals(req_queue->buffer,
4781                                      fsf_req->sbal_first, fsf_req->sbal_number);
4782                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4783                 req_queue->free_index -= fsf_req->sbal_number;
4784                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4785                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4786                 zfcp_erp_adapter_reopen(adapter, 0);
4787         } else {
4788                 req_queue->distance_from_int = new_distance_from_int;
4789                 /*
4790                  * increase FSF sequence counter -
4791                  * this must only be done for request successfully enqueued to
4792                  * QDIO this rejected requests may be cleaned up by calling
4793                  * routines  resulting in missing sequence counter values
4794                  * otherwise,
4795                  */
4796
4797                 /* Don't increase for unsolicited status */
4798                 if (inc_seq_no)
4799                         adapter->fsf_req_seq_no++;
4800
4801                 /* count FSF requests pending */
4802                 atomic_inc(&adapter->reqs_active);
4803         }
4804         return retval;
4805 }
4806
4807 #undef ZFCP_LOG_AREA