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_fsf_req *, u8,
  50         struct fsf_link_down_info *);
  51 static int zfcp_fsf_req_dispatch(struct zfcp_fsf_req *);
  52
  53 /* association between FSF command and FSF QTCB type */
  54 static u32 fsf_qtcb_type[] = {
  55         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  56         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  57         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  58         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  59         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  60         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  61         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  62         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  63         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  64         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  65         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  66         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  67         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  68 };
  69
  70 static const char zfcp_act_subtable_type[5][8] = {
  71         "unknown", "OS", "WWPN", "DID", "LUN"
  72 };
  73
  74 /****************************************************************/
  75 /*************** FSF related Functions  *************************/
  76 /****************************************************************/
  77
  78 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
  79
  80 /*
  81  * function:    zfcp_fsf_req_alloc
  82  *
  83  * purpose:     Obtains an fsf_req and potentially a qtcb (for all but
  84  *              unsolicited requests) via helper functions
  85  *              Does some initial fsf request set-up.
  86  *
  87  * returns:     pointer to allocated fsf_req if successfull
  88  *              NULL otherwise
  89  *
  90  * locks:       none
  91  *
  92  */
  93 static struct zfcp_fsf_req *
  94 zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
  95 {
  96         size_t size;
  97         void *ptr;
  98         struct zfcp_fsf_req *fsf_req = NULL;
  99
 100         if (req_flags & ZFCP_REQ_NO_QTCB)
 101                 size = sizeof(struct zfcp_fsf_req);
 102         else
 103                 size = sizeof(struct zfcp_fsf_req_qtcb);
 104
 105         if (likely(pool))
 106                 ptr = mempool_alloc(pool, GFP_ATOMIC);
 107         else {
 108                 if (req_flags & ZFCP_REQ_NO_QTCB)
 109                         ptr = kmalloc(size, GFP_ATOMIC);
 110                 else
 111                         ptr = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 112                                                GFP_ATOMIC);
 113         }
 114
 115         if (unlikely(!ptr))
 116                 goto out;
 117
 118         memset(ptr, 0, size);
 119
 120         if (req_flags & ZFCP_REQ_NO_QTCB) {
 121                 fsf_req = (struct zfcp_fsf_req *) ptr;
 122         } else {
 123                 fsf_req = &((struct zfcp_fsf_req_qtcb *) ptr)->fsf_req;
 124                 fsf_req->qtcb = &((struct zfcp_fsf_req_qtcb *) ptr)->qtcb;
 125         }
 126
 127         fsf_req->pool = pool;
 128
 129  out:
 130         return fsf_req;
 131 }
 132
 133 /*
 134  * function:    zfcp_fsf_req_free
 135  *
 136  * purpose:     Frees the memory of an fsf_req (and potentially a qtcb) or
 137  *              returns it into the pool via helper functions.
 138  *
 139  * returns:     sod all
 140  *
 141  * locks:       none
 142  */
 143 void
 144 zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
 145 {
 146         if (likely(fsf_req->pool)) {
 147                 mempool_free(fsf_req, fsf_req->pool);
 148                 return;
 149         }
 150
 151         if (fsf_req->qtcb) {
 152                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, fsf_req);
 153                 return;
 154         }
 155
 156         kfree(fsf_req);
 157 }
 158
 159 /*
 160  * Never ever call this without shutting down the adapter first.
 161  * Otherwise the adapter would continue using and corrupting s390 storage.
 162  * Included BUG_ON() call to ensure this is done.
 163  * ERP is supposed to be the only user of this function.
 164  */
 165 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 166 {
 167         struct zfcp_fsf_req *fsf_req, *tmp;
 168         unsigned long flags;
 169         LIST_HEAD(remove_queue);
 170         unsigned int i;
 171
 172         BUG_ON(atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status));
 173         spin_lock_irqsave(&adapter->req_list_lock, flags);
 174         atomic_set(&adapter->reqs_active, 0);
 175         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 176                 list_splice_init(&adapter->req_list[i], &remove_queue);
 177         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 178
 179         list_for_each_entry_safe(fsf_req, tmp, &remove_queue, list) {
 180                 list_del(&fsf_req->list);
 181                 fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 182                 zfcp_fsf_req_complete(fsf_req);
 183         }
 184 }
 185
 186 /*
 187  * function:    zfcp_fsf_req_complete
 188  *
 189  * purpose:     Updates active counts and timers for openfcp-reqs
 190  *              May cleanup request after req_eval returns
 191  *
 192  * returns:     0 - success
 193  *              !0 - failure
 194  *
 195  * context:
 196  */
 197 int
 198 zfcp_fsf_req_complete(struct zfcp_fsf_req *fsf_req)
 199 {
 200         int retval = 0;
 201         int cleanup;
 202
 203         if (unlikely(fsf_req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 204                 ZFCP_LOG_DEBUG("Status read response received\n");
 205                 /*
 206                  * Note: all cleanup handling is done in the callchain of
 207                  * the function call-chain below.
 208                  */
 209                 zfcp_fsf_status_read_handler(fsf_req);
 210                 goto out;
 211         } else {
 212                 del_timer(&fsf_req->timer);
 213                 zfcp_fsf_protstatus_eval(fsf_req);
 214         }
 215
 216         /*
 217          * fsf_req may be deleted due to waking up functions, so
 218          * cleanup is saved here and used later
 219          */
 220         if (likely(fsf_req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 221                 cleanup = 1;
 222         else
 223                 cleanup = 0;
 224
 225         fsf_req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 226
 227         /* cleanup request if requested by initiator */
 228         if (likely(cleanup)) {
 229                 ZFCP_LOG_TRACE("removing FSF request %p\n", fsf_req);
 230                 /*
 231                  * lock must not be held here since it will be
 232                  * grabed by the called routine, too
 233                  */
 234                 zfcp_fsf_req_free(fsf_req);
 235         } else {
 236                 /* notify initiator waiting for the requests completion */
 237                 ZFCP_LOG_TRACE("waking initiator of FSF request %p\n",fsf_req);
 238                 /*
 239                  * FIXME: Race! We must not access fsf_req here as it might have been
 240                  * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 241                  * flag. It's an improbable case. But, we have the same paranoia for
 242                  * the cleanup flag already.
 243                  * Might better be handled using complete()?
 244                  * (setting the flag and doing wakeup ought to be atomic
 245                  *  with regard to checking the flag as long as waitqueue is
 246                  *  part of the to be released structure)
 247                  */
 248                 wake_up(&fsf_req->completion_wq);
 249         }
 250
 251  out:
 252         return retval;
 253 }
 254
 255 /*
 256  * function:    zfcp_fsf_protstatus_eval
 257  *
 258  * purpose:     evaluates the QTCB of the finished FSF request
 259  *              and initiates appropriate actions
 260  *              (usually calling FSF command specific handlers)
 261  *
 262  * returns:
 263  *
 264  * context:
 265  *
 266  * locks:
 267  */
 268 static int
 269 zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *fsf_req)
 270 {
 271         int retval = 0;
 272         struct zfcp_adapter *adapter = fsf_req->adapter;
 273         struct fsf_qtcb *qtcb = fsf_req->qtcb;
 274         union fsf_prot_status_qual *prot_status_qual =
 275                 &qtcb->prefix.prot_status_qual;
 276
 277         zfcp_hba_dbf_event_fsf_response(fsf_req);
 278
 279         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 280                 ZFCP_LOG_DEBUG("fsf_req 0x%lx has been dismissed\n",
 281                                (unsigned long) fsf_req);
 282                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 283                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 284                 goto skip_protstatus;
 285         }
 286
 287         /* evaluate FSF Protocol Status */
 288         switch (qtcb->prefix.prot_status) {
 289
 290         case FSF_PROT_GOOD:
 291         case FSF_PROT_FSF_STATUS_PRESENTED:
 292                 break;
 293
 294         case FSF_PROT_QTCB_VERSION_ERROR:
 295                 ZFCP_LOG_NORMAL("error: The adapter %s contains "
 296                                 "microcode of version 0x%x, the device driver "
 297                                 "only supports 0x%x. Aborting.\n",
 298                                 zfcp_get_busid_by_adapter(adapter),
 299                                 prot_status_qual->version_error.fsf_version,
 300                                 ZFCP_QTCB_VERSION);
 301                 zfcp_erp_adapter_shutdown(adapter, 0, 117, fsf_req);
 302                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 303                 break;
 304
 305         case FSF_PROT_SEQ_NUMB_ERROR:
 306                 ZFCP_LOG_NORMAL("bug: Sequence number mismatch between "
 307                                 "driver (0x%x) and adapter %s (0x%x). "
 308                                 "Restarting all operations on this adapter.\n",
 309                                 qtcb->prefix.req_seq_no,
 310                                 zfcp_get_busid_by_adapter(adapter),
 311                                 prot_status_qual->sequence_error.exp_req_seq_no);
 312                 zfcp_erp_adapter_reopen(adapter, 0, 98, fsf_req);
 313                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 314                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 315                 break;
 316
 317         case FSF_PROT_UNSUPP_QTCB_TYPE:
 318                 ZFCP_LOG_NORMAL("error: Packet header type used by the "
 319                                 "device driver is incompatible with "
 320                                 "that used on adapter %s. "
 321                                 "Stopping all operations on this adapter.\n",
 322                                 zfcp_get_busid_by_adapter(adapter));
 323                 zfcp_erp_adapter_shutdown(adapter, 0, 118, fsf_req);
 324                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 325                 break;
 326
 327         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 328                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 329                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 330                                 &(adapter->status));
 331                 break;
 332
 333         case FSF_PROT_DUPLICATE_REQUEST_ID:
 334                         ZFCP_LOG_NORMAL("bug: The request identifier 0x%Lx "
 335                                         "to the adapter %s is ambiguous. "
 336                                 "Stopping all operations on this adapter.\n",
 337                                 *(unsigned long long*)
 338                                 (&qtcb->bottom.support.req_handle),
 339                                         zfcp_get_busid_by_adapter(adapter));
 340                 zfcp_erp_adapter_shutdown(adapter, 0, 78, fsf_req);
 341                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 342                 break;
 343
 344         case FSF_PROT_LINK_DOWN:
 345                 zfcp_fsf_link_down_info_eval(fsf_req, 37,
 346                                              &prot_status_qual->link_down_info);
 347                 /* FIXME: reopening adapter now? better wait for link up */
 348                 zfcp_erp_adapter_reopen(adapter, 0, 79, fsf_req);
 349                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 350                 break;
 351
 352         case FSF_PROT_REEST_QUEUE:
 353                 ZFCP_LOG_NORMAL("The local link to adapter with "
 354                               "%s was re-plugged. "
 355                               "Re-starting operations on this adapter.\n",
 356                               zfcp_get_busid_by_adapter(adapter));
 357                 /* All ports should be marked as ready to run again */
 358                 zfcp_erp_modify_adapter_status(adapter, 28, NULL,
 359                                                ZFCP_STATUS_COMMON_RUNNING,
 360                                                ZFCP_SET);
 361                 zfcp_erp_adapter_reopen(adapter,
 362                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 363                                         | ZFCP_STATUS_COMMON_ERP_FAILED,
 364                                         99, fsf_req);
 365                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 366                 break;
 367
 368         case FSF_PROT_ERROR_STATE:
 369                 ZFCP_LOG_NORMAL("error: The adapter %s "
 370                                 "has entered the error state. "
 371                                 "Restarting all operations on this "
 372                                 "adapter.\n",
 373                                 zfcp_get_busid_by_adapter(adapter));
 374                 zfcp_erp_adapter_reopen(adapter, 0, 100, fsf_req);
 375                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 376                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 377                 break;
 378
 379         default:
 380                 ZFCP_LOG_NORMAL("bug: Transfer protocol status information "
 381                                 "provided by the adapter %s "
 382                                 "is not compatible with the device driver. "
 383                                 "Stopping all operations on this adapter. "
 384                                 "(debug info 0x%x).\n",
 385                                 zfcp_get_busid_by_adapter(adapter),
 386                                 qtcb->prefix.prot_status);
 387                 zfcp_erp_adapter_shutdown(adapter, 0, 119, fsf_req);
 388                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 389         }
 390
 391  skip_protstatus:
 392         /*
 393          * always call specific handlers to give them a chance to do
 394          * something meaningful even in error cases
 395          */
 396         zfcp_fsf_fsfstatus_eval(fsf_req);
 397         return retval;
 398 }
 399
 400 /*
 401  * function:    zfcp_fsf_fsfstatus_eval
 402  *
 403  * purpose:     evaluates FSF status of completed FSF request
 404  *              and acts accordingly
 405  *
 406  * returns:
 407  */
 408 static int
 409 zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
 410 {
 411         int retval = 0;
 412
 413         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 414                 goto skip_fsfstatus;
 415         }
 416
 417         /* evaluate FSF Status */
 418         switch (fsf_req->qtcb->header.fsf_status) {
 419         case FSF_UNKNOWN_COMMAND:
 420                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 421                                 "not known by the adapter %s "
 422                                 "Stopping all operations on this adapter. "
 423                                 "(debug info 0x%x).\n",
 424                                 zfcp_get_busid_by_adapter(fsf_req->adapter),
 425                                 fsf_req->qtcb->header.fsf_command);
 426                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 120, fsf_req);
 427                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 428                 break;
 429
 430         case FSF_FCP_RSP_AVAILABLE:
 431                 ZFCP_LOG_DEBUG("FCP Sense data will be presented to the "
 432                                "SCSI stack.\n");
 433                 break;
 434
 435         case FSF_ADAPTER_STATUS_AVAILABLE:
 436                 zfcp_fsf_fsfstatus_qual_eval(fsf_req);
 437                 break;
 438         }
 439
 440  skip_fsfstatus:
 441         /*
 442          * always call specific handlers to give them a chance to do
 443          * something meaningful even in error cases
 444          */
 445         zfcp_fsf_req_dispatch(fsf_req);
 446
 447         return retval;
 448 }
 449
 450 /*
 451  * function:    zfcp_fsf_fsfstatus_qual_eval
 452  *
 453  * purpose:     evaluates FSF status-qualifier of completed FSF request
 454  *              and acts accordingly
 455  *
 456  * returns:
 457  */
 458 static int
 459 zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
 460 {
 461         int retval = 0;
 462
 463         switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 464         case FSF_SQ_FCP_RSP_AVAILABLE:
 465                 break;
 466         case FSF_SQ_RETRY_IF_POSSIBLE:
 467                 /* The SCSI-stack may now issue retries or escalate */
 468                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 469                 break;
 470         case FSF_SQ_COMMAND_ABORTED:
 471                 /* Carry the aborted state on to upper layer */
 472                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 473                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 474                 break;
 475         case FSF_SQ_NO_RECOM:
 476                 ZFCP_LOG_NORMAL("bug: No recommendation could be given for a "
 477                                 "problem on the adapter %s "
 478                                 "Stopping all operations on this adapter. ",
 479                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 480                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 121, fsf_req);
 481                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 482                 break;
 483         case FSF_SQ_ULP_PROGRAMMING_ERROR:
 484                 ZFCP_LOG_NORMAL("error: not enough SBALs for data transfer "
 485                                 "(adapter %s)\n",
 486                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 487                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 488                 break;
 489         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 490         case FSF_SQ_NO_RETRY_POSSIBLE:
 491         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 492                 /* dealt with in the respective functions */
 493                 break;
 494         default:
 495                 ZFCP_LOG_NORMAL("bug: Additional status info could "
 496                                 "not be interpreted properly.\n");
 497                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 498                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
 499                               sizeof (union fsf_status_qual));
 500                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 501                 break;
 502         }
 503
 504         return retval;
 505 }
 506
 507 /**
 508  * zfcp_fsf_link_down_info_eval - evaluate link down information block
 509  */
 510 static void
 511 zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *fsf_req, u8 id,
 512                              struct fsf_link_down_info *link_down)
 513 {
 514         struct zfcp_adapter *adapter = fsf_req->adapter;
 515
 516         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 517                              &adapter->status))
 518                 return;
 519
 520         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 521
 522         if (link_down == NULL)
 523                 goto out;
 524
 525         switch (link_down->error_code) {
 526         case FSF_PSQ_LINK_NO_LIGHT:
 527                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 528                                 "(no light detected)\n",
 529                                 zfcp_get_busid_by_adapter(adapter));
 530                 break;
 531         case FSF_PSQ_LINK_WRAP_PLUG:
 532                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 533                                 "(wrap plug detected)\n",
 534                                 zfcp_get_busid_by_adapter(adapter));
 535                 break;
 536         case FSF_PSQ_LINK_NO_FCP:
 537                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 538                                 "(adjacent node on link does not support FCP)\n",
 539                                 zfcp_get_busid_by_adapter(adapter));
 540                 break;
 541         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 542                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 543                                 "(firmware update in progress)\n",
 544                                 zfcp_get_busid_by_adapter(adapter));
 545                         break;
 546         case FSF_PSQ_LINK_INVALID_WWPN:
 547                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 548                                 "(duplicate or invalid WWPN detected)\n",
 549                                 zfcp_get_busid_by_adapter(adapter));
 550                 break;
 551         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 552                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 553                                 "(no support for NPIV by Fabric)\n",
 554                                 zfcp_get_busid_by_adapter(adapter));
 555                 break;
 556         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 557                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 558                                 "(out of resource in FCP daughtercard)\n",
 559                                 zfcp_get_busid_by_adapter(adapter));
 560                 break;
 561         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 562                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 563                                 "(out of resource in Fabric)\n",
 564                                 zfcp_get_busid_by_adapter(adapter));
 565                 break;
 566         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 567                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 568                                 "(unable to Fabric login)\n",
 569                                 zfcp_get_busid_by_adapter(adapter));
 570                 break;
 571         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 572                 ZFCP_LOG_NORMAL("WWPN assignment file corrupted on adapter %s\n",
 573                                 zfcp_get_busid_by_adapter(adapter));
 574                 break;
 575         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 576                 ZFCP_LOG_NORMAL("Mode table corrupted on adapter %s\n",
 577                                 zfcp_get_busid_by_adapter(adapter));
 578                 break;
 579         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 580                 ZFCP_LOG_NORMAL("No WWPN for assignment table on adapter %s\n",
 581                                 zfcp_get_busid_by_adapter(adapter));
 582                 break;
 583         default:
 584                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 585                                 "(warning: unknown reason code %d)\n",
 586                                 zfcp_get_busid_by_adapter(adapter),
 587                                 link_down->error_code);
 588         }
 589
 590         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 591                 ZFCP_LOG_DEBUG("Debug information to link down: "
 592                                "primary_status=0x%02x "
 593                                "ioerr_code=0x%02x "
 594                                "action_code=0x%02x "
 595                                "reason_code=0x%02x "
 596                                "explanation_code=0x%02x "
 597                                "vendor_specific_code=0x%02x\n",
 598                                 link_down->primary_status,
 599                                 link_down->ioerr_code,
 600                                 link_down->action_code,
 601                                 link_down->reason_code,
 602                                 link_down->explanation_code,
 603                                 link_down->vendor_specific_code);
 604
 605  out:
 606         zfcp_erp_adapter_failed(adapter, id, fsf_req);
 607 }
 608
 609 /*
 610  * function:    zfcp_fsf_req_dispatch
 611  *
 612  * purpose:     calls the appropriate command specific handler
 613  *
 614  * returns:
 615  */
 616 static int
 617 zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
 618 {
 619         struct zfcp_erp_action *erp_action = fsf_req->erp_action;
 620         struct zfcp_adapter *adapter = fsf_req->adapter;
 621         int retval = 0;
 622
 623
 624         switch (fsf_req->fsf_command) {
 625
 626         case FSF_QTCB_FCP_CMND:
 627                 zfcp_fsf_send_fcp_command_handler(fsf_req);
 628                 break;
 629
 630         case FSF_QTCB_ABORT_FCP_CMND:
 631                 zfcp_fsf_abort_fcp_command_handler(fsf_req);
 632                 break;
 633
 634         case FSF_QTCB_SEND_GENERIC:
 635                 zfcp_fsf_send_ct_handler(fsf_req);
 636                 break;
 637
 638         case FSF_QTCB_OPEN_PORT_WITH_DID:
 639                 zfcp_fsf_open_port_handler(fsf_req);
 640                 break;
 641
 642         case FSF_QTCB_OPEN_LUN:
 643                 zfcp_fsf_open_unit_handler(fsf_req);
 644                 break;
 645
 646         case FSF_QTCB_CLOSE_LUN:
 647                 zfcp_fsf_close_unit_handler(fsf_req);
 648                 break;
 649
 650         case FSF_QTCB_CLOSE_PORT:
 651                 zfcp_fsf_close_port_handler(fsf_req);
 652                 break;
 653
 654         case FSF_QTCB_CLOSE_PHYSICAL_PORT:
 655                 zfcp_fsf_close_physical_port_handler(fsf_req);
 656                 break;
 657
 658         case FSF_QTCB_EXCHANGE_CONFIG_DATA:
 659                 zfcp_fsf_exchange_config_data_handler(fsf_req);
 660                 break;
 661
 662         case FSF_QTCB_EXCHANGE_PORT_DATA:
 663                 zfcp_fsf_exchange_port_data_handler(fsf_req);
 664                 break;
 665
 666         case FSF_QTCB_SEND_ELS:
 667                 zfcp_fsf_send_els_handler(fsf_req);
 668                 break;
 669
 670         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 671                 zfcp_fsf_control_file_handler(fsf_req);
 672                 break;
 673
 674         case FSF_QTCB_UPLOAD_CONTROL_FILE:
 675                 zfcp_fsf_control_file_handler(fsf_req);
 676                 break;
 677
 678         default:
 679                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 680                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 681                                 "not supported by the adapter %s\n",
 682                                 zfcp_get_busid_by_adapter(adapter));
 683                 if (fsf_req->fsf_command != fsf_req->qtcb->header.fsf_command)
 684                         ZFCP_LOG_NORMAL
 685                             ("bug: Command issued by the device driver differs "
 686                              "from the command returned by the adapter %s "
 687                              "(debug info 0x%x, 0x%x).\n",
 688                              zfcp_get_busid_by_adapter(adapter),
 689                              fsf_req->fsf_command,
 690                              fsf_req->qtcb->header.fsf_command);
 691         }
 692
 693         if (!erp_action)
 694                 return retval;
 695
 696         zfcp_erp_async_handler(erp_action, 0);
 697
 698         return retval;
 699 }
 700
 701 /*
 702  * function:    zfcp_fsf_status_read
 703  *
 704  * purpose:     initiates a Status Read command at the specified adapter
 705  *
 706  * returns:
 707  */
 708 int
 709 zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
 710 {
 711         struct zfcp_fsf_req *fsf_req;
 712         struct fsf_status_read_buffer *status_buffer;
 713         unsigned long lock_flags;
 714         volatile struct qdio_buffer_element *sbale;
 715         int retval = 0;
 716
 717         /* setup new FSF request */
 718         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 719                                      req_flags | ZFCP_REQ_NO_QTCB,
 720                                      adapter->pool.fsf_req_status_read,
 721                                      &lock_flags, &fsf_req);
 722         if (retval < 0) {
 723                 ZFCP_LOG_INFO("error: Could not create unsolicited status "
 724                               "buffer for adapter %s.\n",
 725                               zfcp_get_busid_by_adapter(adapter));
 726                 goto failed_req_create;
 727         }
 728
 729         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 730         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 731         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 732         fsf_req->sbale_curr = 2;
 733
 734         status_buffer =
 735                 mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 736         if (!status_buffer) {
 737                 ZFCP_LOG_NORMAL("bug: could not get some buffer\n");
 738                 goto failed_buf;
 739         }
 740         memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
 741         fsf_req->data = (unsigned long) status_buffer;
 742
 743         /* insert pointer to respective buffer */
 744         sbale = zfcp_qdio_sbale_curr(fsf_req);
 745         sbale->addr = (void *) status_buffer;
 746         sbale->length = sizeof(struct fsf_status_read_buffer);
 747
 748         retval = zfcp_fsf_req_send(fsf_req);
 749         if (retval) {
 750                 ZFCP_LOG_DEBUG("error: Could not set-up unsolicited status "
 751                                "environment.\n");
 752                 goto failed_req_send;
 753         }
 754
 755         ZFCP_LOG_TRACE("Status Read request initiated (adapter%s)\n",
 756                        zfcp_get_busid_by_adapter(adapter));
 757         goto out;
 758
 759  failed_req_send:
 760         mempool_free(status_buffer, adapter->pool.data_status_read);
 761
 762  failed_buf:
 763         zfcp_fsf_req_free(fsf_req);
 764  failed_req_create:
 765         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 766  out:
 767         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 768         return retval;
 769 }
 770
 771 static int
 772 zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
 773 {
 774         struct fsf_status_read_buffer *status_buffer;
 775         struct zfcp_adapter *adapter;
 776         struct zfcp_port *port;
 777         unsigned long flags;
 778
 779         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
 780         adapter = fsf_req->adapter;
 781
 782         read_lock_irqsave(&zfcp_data.config_lock, flags);
 783         list_for_each_entry(port, &adapter->port_list_head, list)
 784             if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
 785                 break;
 786         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 787
 788         if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
 789                 ZFCP_LOG_NORMAL("bug: Reopen port indication received for "
 790                                 "nonexisting port with d_id 0x%06x on "
 791                                 "adapter %s. Ignored.\n",
 792                                 status_buffer->d_id & ZFCP_DID_MASK,
 793                                 zfcp_get_busid_by_adapter(adapter));
 794                 goto out;
 795         }
 796
 797         switch (status_buffer->status_subtype) {
 798
 799         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 800                 zfcp_erp_port_reopen(port, 0, 101, fsf_req);
 801                 break;
 802
 803         case FSF_STATUS_READ_SUB_ERROR_PORT:
 804                 zfcp_erp_port_shutdown(port, 0, 122, fsf_req);
 805                 break;
 806
 807         default:
 808                 ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
 809                                 "for a reopen indication on port with "
 810                                 "d_id 0x%06x on the adapter %s. "
 811                                 "Ignored. (debug info 0x%x)\n",
 812                                 status_buffer->d_id,
 813                                 zfcp_get_busid_by_adapter(adapter),
 814                                 status_buffer->status_subtype);
 815         }
 816  out:
 817         return 0;
 818 }
 819
 820 /*
 821  * function:    zfcp_fsf_status_read_handler
 822  *
 823  * purpose:     is called for finished Open Port command
 824  *
 825  * returns:
 826  */
 827 static int
 828 zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
 829 {
 830         int retval = 0;
 831         struct zfcp_adapter *adapter = fsf_req->adapter;
 832         struct fsf_status_read_buffer *status_buffer =
 833                 (struct fsf_status_read_buffer *) fsf_req->data;
 834         struct fsf_bit_error_payload *fsf_bit_error;
 835
 836         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 837                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, status_buffer);
 838                 mempool_free(status_buffer, adapter->pool.data_status_read);
 839                 zfcp_fsf_req_free(fsf_req);
 840                 goto out;
 841         }
 842
 843         zfcp_hba_dbf_event_fsf_unsol("read", adapter, status_buffer);
 844
 845         switch (status_buffer->status_type) {
 846
 847         case FSF_STATUS_READ_PORT_CLOSED:
 848                 zfcp_fsf_status_read_port_closed(fsf_req);
 849                 break;
 850
 851         case FSF_STATUS_READ_INCOMING_ELS:
 852                 zfcp_fsf_incoming_els(fsf_req);
 853                 break;
 854
 855         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 856                 ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
 857                               zfcp_get_busid_by_adapter(adapter));
 858                 break;
 859
 860         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 861                 fsf_bit_error = (struct fsf_bit_error_payload *)
 862                         status_buffer->payload;
 863                 ZFCP_LOG_NORMAL("Warning: bit error threshold data "
 864                     "received (adapter %s, "
 865                     "link failures = %i, loss of sync errors = %i, "
 866                     "loss of signal errors = %i, "
 867                     "primitive sequence errors = %i, "
 868                     "invalid transmission word errors = %i, "
 869                     "CRC errors = %i)\n",
 870                     zfcp_get_busid_by_adapter(adapter),
 871                     fsf_bit_error->link_failure_error_count,
 872                     fsf_bit_error->loss_of_sync_error_count,
 873                     fsf_bit_error->loss_of_signal_error_count,
 874                     fsf_bit_error->primitive_sequence_error_count,
 875                     fsf_bit_error->invalid_transmission_word_error_count,
 876                     fsf_bit_error->crc_error_count);
 877                 ZFCP_LOG_INFO("Additional bit error threshold data "
 878                     "(adapter %s, "
 879                     "primitive sequence event time-outs = %i, "
 880                     "elastic buffer overrun errors = %i, "
 881                     "advertised receive buffer-to-buffer credit = %i, "
 882                     "current receice buffer-to-buffer credit = %i, "
 883                     "advertised transmit buffer-to-buffer credit = %i, "
 884                     "current transmit buffer-to-buffer credit = %i)\n",
 885                     zfcp_get_busid_by_adapter(adapter),
 886                     fsf_bit_error->primitive_sequence_event_timeout_count,
 887                     fsf_bit_error->elastic_buffer_overrun_error_count,
 888                     fsf_bit_error->advertised_receive_b2b_credit,
 889                     fsf_bit_error->current_receive_b2b_credit,
 890                     fsf_bit_error->advertised_transmit_b2b_credit,
 891                     fsf_bit_error->current_transmit_b2b_credit);
 892                 break;
 893
 894         case FSF_STATUS_READ_LINK_DOWN:
 895                 switch (status_buffer->status_subtype) {
 896                 case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 897                         ZFCP_LOG_INFO("Physical link to adapter %s is down\n",
 898                                       zfcp_get_busid_by_adapter(adapter));
 899                         zfcp_fsf_link_down_info_eval(fsf_req, 38,
 900                                 (struct fsf_link_down_info *)
 901                                 &status_buffer->payload);
 902                         break;
 903                 case FSF_STATUS_READ_SUB_FDISC_FAILED:
 904                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 905                                       "due to failed FDISC login\n",
 906                                       zfcp_get_busid_by_adapter(adapter));
 907                         zfcp_fsf_link_down_info_eval(fsf_req, 39,
 908                                 (struct fsf_link_down_info *)
 909                                 &status_buffer->payload);
 910                         break;
 911                 case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 912                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 913                                       "due to firmware update on adapter\n",
 914                                       zfcp_get_busid_by_adapter(adapter));
 915                         zfcp_fsf_link_down_info_eval(fsf_req, 40, NULL);
 916                         break;
 917                 default:
 918                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 919                                       "due to unknown reason\n",
 920                                       zfcp_get_busid_by_adapter(adapter));
 921                         zfcp_fsf_link_down_info_eval(fsf_req, 41, NULL);
 922                 };
 923                 break;
 924
 925         case FSF_STATUS_READ_LINK_UP:
 926                 ZFCP_LOG_NORMAL("Local link to adapter %s was replugged. "
 927                                 "Restarting operations on this adapter\n",
 928                                 zfcp_get_busid_by_adapter(adapter));
 929                 /* All ports should be marked as ready to run again */
 930                 zfcp_erp_modify_adapter_status(adapter, 30, NULL,
 931                                                ZFCP_STATUS_COMMON_RUNNING,
 932                                                ZFCP_SET);
 933                 zfcp_erp_adapter_reopen(adapter,
 934                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 935                                         | ZFCP_STATUS_COMMON_ERP_FAILED,
 936                                         102, fsf_req);
 937                 break;
 938
 939         case FSF_STATUS_READ_NOTIFICATION_LOST:
 940                 ZFCP_LOG_NORMAL("Unsolicited status notification(s) lost: "
 941                                 "adapter %s%s%s%s%s%s%s%s%s\n",
 942                                 zfcp_get_busid_by_adapter(adapter),
 943                                 (status_buffer->status_subtype &
 944                                         FSF_STATUS_READ_SUB_INCOMING_ELS) ?
 945                                         ", incoming ELS" : "",
 946                                 (status_buffer->status_subtype &
 947                                         FSF_STATUS_READ_SUB_SENSE_DATA) ?
 948                                         ", sense data" : "",
 949                                 (status_buffer->status_subtype &
 950                                         FSF_STATUS_READ_SUB_LINK_STATUS) ?
 951                                         ", link status change" : "",
 952                                 (status_buffer->status_subtype &
 953                                         FSF_STATUS_READ_SUB_PORT_CLOSED) ?
 954                                         ", port close" : "",
 955                                 (status_buffer->status_subtype &
 956                                         FSF_STATUS_READ_SUB_BIT_ERROR_THRESHOLD) ?
 957                                         ", bit error exception" : "",
 958                                 (status_buffer->status_subtype &
 959                                         FSF_STATUS_READ_SUB_ACT_UPDATED) ?
 960                                         ", ACT update" : "",
 961                                 (status_buffer->status_subtype &
 962                                         FSF_STATUS_READ_SUB_ACT_HARDENED) ?
 963                                         ", ACT hardening" : "",
 964                                 (status_buffer->status_subtype &
 965                                         FSF_STATUS_READ_SUB_FEATURE_UPDATE_ALERT) ?
 966                                         ", adapter feature change" : "");
 967
 968                 if (status_buffer->status_subtype &
 969                     FSF_STATUS_READ_SUB_ACT_UPDATED)
 970                         zfcp_erp_adapter_access_changed(adapter, 135, fsf_req);
 971                 break;
 972
 973         case FSF_STATUS_READ_CFDC_UPDATED:
 974                 ZFCP_LOG_NORMAL("CFDC has been updated on the adapter %s\n",
 975                               zfcp_get_busid_by_adapter(adapter));
 976                 zfcp_erp_adapter_access_changed(adapter, 136, fsf_req);
 977                 break;
 978
 979         case FSF_STATUS_READ_CFDC_HARDENED:
 980                 switch (status_buffer->status_subtype) {
 981                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
 982                         ZFCP_LOG_NORMAL("CFDC of adapter %s saved on SE\n",
 983                                       zfcp_get_busid_by_adapter(adapter));
 984                         break;
 985                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
 986                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been copied "
 987                                       "to the secondary SE\n",
 988                                 zfcp_get_busid_by_adapter(adapter));
 989                         break;
 990                 default:
 991                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been hardened\n",
 992                                       zfcp_get_busid_by_adapter(adapter));
 993                 }
 994                 break;
 995
 996         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 997                 ZFCP_LOG_INFO("List of supported features on adapter %s has "
 998                               "been changed from 0x%08X to 0x%08X\n",
 999                               zfcp_get_busid_by_adapter(adapter),
1000                               *(u32*) (status_buffer->payload + 4),
1001                               *(u32*) (status_buffer->payload));
1002                 adapter->adapter_features = *(u32*) status_buffer->payload;
1003                 break;
1004
1005         default:
1006                 ZFCP_LOG_NORMAL("warning: An unsolicited status packet of unknown "
1007                                 "type was received (debug info 0x%x)\n",
1008                                 status_buffer->status_type);
1009                 ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
1010                                status_buffer);
1011                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1012                               (char *) status_buffer,
1013                               sizeof (struct fsf_status_read_buffer));
1014                 break;
1015         }
1016         mempool_free(status_buffer, adapter->pool.data_status_read);
1017         zfcp_fsf_req_free(fsf_req);
1018         /*
1019          * recycle buffer and start new request repeat until outbound
1020          * queue is empty or adapter shutdown is requested
1021          */
1022         /*
1023          * FIXME(qdio):
1024          * we may wait in the req_create for 5s during shutdown, so
1025          * qdio_cleanup will have to wait at least that long before returning
1026          * with failure to allow us a proper cleanup under all circumstances
1027          */
1028         /*
1029          * FIXME:
1030          * allocation failure possible? (Is this code needed?)
1031          */
1032         retval = zfcp_fsf_status_read(adapter, 0);
1033         if (retval < 0) {
1034                 ZFCP_LOG_INFO("Failed to create unsolicited status read "
1035                               "request for the adapter %s.\n",
1036                               zfcp_get_busid_by_adapter(adapter));
1037                 /* temporary fix to avoid status read buffer shortage */
1038                 adapter->status_read_failed++;
1039                 if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
1040                     < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
1041                         ZFCP_LOG_INFO("restart adapter %s due to status read "
1042                                       "buffer shortage\n",
1043                                       zfcp_get_busid_by_adapter(adapter));
1044                         zfcp_erp_adapter_reopen(adapter, 0, 103, fsf_req);
1045                 }
1046         }
1047  out:
1048         return retval;
1049 }
1050
1051 /*
1052  * function:    zfcp_fsf_abort_fcp_command
1053  *
1054  * purpose:     tells FSF to abort a running SCSI command
1055  *
1056  * returns:     address of initiated FSF request
1057  *              NULL - request could not be initiated
1058  *
1059  * FIXME(design): should be watched by a timeout !!!
1060  * FIXME(design) shouldn't this be modified to return an int
1061  *               also...don't know how though
1062  */
1063 struct zfcp_fsf_req *
1064 zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
1065                            struct zfcp_adapter *adapter,
1066                            struct zfcp_unit *unit, int req_flags)
1067 {
1068         volatile struct qdio_buffer_element *sbale;
1069         struct zfcp_fsf_req *fsf_req = NULL;
1070         unsigned long lock_flags;
1071         int retval = 0;
1072
1073         /* setup new FSF request */
1074         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
1075                                      req_flags, adapter->pool.fsf_req_abort,
1076                                      &lock_flags, &fsf_req);
1077         if (retval < 0) {
1078                 ZFCP_LOG_INFO("error: Failed to create an abort command "
1079                               "request for lun 0x%016Lx on port 0x%016Lx "
1080                               "on adapter %s.\n",
1081                               unit->fcp_lun,
1082                               unit->port->wwpn,
1083                               zfcp_get_busid_by_adapter(adapter));
1084                 goto out;
1085         }
1086
1087         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1088                         &unit->status)))
1089                 goto unit_blocked;
1090
1091         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1092         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1093         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1094
1095         fsf_req->data = (unsigned long) unit;
1096
1097         /* set handles of unit and its parent port in QTCB */
1098         fsf_req->qtcb->header.lun_handle = unit->handle;
1099         fsf_req->qtcb->header.port_handle = unit->port->handle;
1100
1101         /* set handle of request which should be aborted */
1102         fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1103
1104         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
1105         retval = zfcp_fsf_req_send(fsf_req);
1106         if (!retval)
1107                 goto out;
1108
1109  unit_blocked:
1110                 zfcp_fsf_req_free(fsf_req);
1111                 fsf_req = NULL;
1112
1113  out:
1114         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
1115         return fsf_req;
1116 }
1117
1118 /*
1119  * function:    zfcp_fsf_abort_fcp_command_handler
1120  *
1121  * purpose:     is called for finished Abort FCP Command request
1122  *
1123  * returns:
1124  */
1125 static int
1126 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
1127 {
1128         int retval = -EINVAL;
1129         struct zfcp_unit *unit;
1130         union fsf_status_qual *fsf_stat_qual =
1131                 &new_fsf_req->qtcb->header.fsf_status_qual;
1132
1133         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1134                 /* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
1135                 goto skip_fsfstatus;
1136         }
1137
1138         unit = (struct zfcp_unit *) new_fsf_req->data;
1139
1140         /* evaluate FSF status in QTCB */
1141         switch (new_fsf_req->qtcb->header.fsf_status) {
1142
1143         case FSF_PORT_HANDLE_NOT_VALID:
1144                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1145                         /*
1146                          * In this case a command that was sent prior to a port
1147                          * reopen was aborted (handles are different). This is
1148                          * fine.
1149                          */
1150                 } else {
1151                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1152                                       "port 0x%016Lx on adapter %s invalid. "
1153                                       "This may happen occasionally.\n",
1154                                       unit->port->handle,
1155                                       unit->port->wwpn,
1156                                       zfcp_get_busid_by_unit(unit));
1157                         ZFCP_LOG_INFO("status qualifier:\n");
1158                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1159                                       (char *) &new_fsf_req->qtcb->header.
1160                                       fsf_status_qual,
1161                                       sizeof (union fsf_status_qual));
1162                         /* Let's hope this sorts out the mess */
1163                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
1164                                                 new_fsf_req);
1165                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1166                 }
1167                 break;
1168
1169         case FSF_LUN_HANDLE_NOT_VALID:
1170                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1171                         /*
1172                          * In this case a command that was sent prior to a unit
1173                          * reopen was aborted (handles are different).
1174                          * This is fine.
1175                          */
1176                 } else {
1177                         ZFCP_LOG_INFO
1178                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1179                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1180                              "invalid. This may happen in rare cases. "
1181                              "Trying to re-establish link.\n",
1182                              unit->handle,
1183                              unit->fcp_lun,
1184                              unit->port->wwpn,
1185                              zfcp_get_busid_by_unit(unit));
1186                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1187                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1188                                       (char *) &new_fsf_req->qtcb->header.
1189                                       fsf_status_qual,
1190                                       sizeof (union fsf_status_qual));
1191                         /* Let's hope this sorts out the mess */
1192                         zfcp_erp_port_reopen(unit->port, 0, 105, new_fsf_req);
1193                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1194                 }
1195                 break;
1196
1197         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1198                 retval = 0;
1199                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1200                 break;
1201
1202         case FSF_PORT_BOXED:
1203                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1204                               "be reopened\n", unit->port->wwpn,
1205                               zfcp_get_busid_by_unit(unit));
1206                 zfcp_erp_port_boxed(unit->port, 47, new_fsf_req);
1207                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1208                     | ZFCP_STATUS_FSFREQ_RETRY;
1209                 break;
1210
1211         case FSF_LUN_BOXED:
1212                 ZFCP_LOG_INFO(
1213                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1214                         "to be reopened\n",
1215                         unit->fcp_lun, unit->port->wwpn,
1216                         zfcp_get_busid_by_unit(unit));
1217                 zfcp_erp_unit_boxed(unit, 48, new_fsf_req);
1218                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1219                         | ZFCP_STATUS_FSFREQ_RETRY;
1220                 break;
1221
1222         case FSF_ADAPTER_STATUS_AVAILABLE:
1223                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1224                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1225                         zfcp_test_link(unit->port);
1226                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1227                         break;
1228                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1229                         /* SCSI stack will escalate */
1230                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1231                         break;
1232                 default:
1233                         ZFCP_LOG_NORMAL
1234                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1235                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1236                         break;
1237                 }
1238                 break;
1239
1240         case FSF_GOOD:
1241                 retval = 0;
1242                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1243                 break;
1244
1245         default:
1246                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1247                                 "(debug info 0x%x)\n",
1248                                 new_fsf_req->qtcb->header.fsf_status);
1249                 break;
1250         }
1251  skip_fsfstatus:
1252         return retval;
1253 }
1254
1255 /**
1256  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1257  *      one SBALE
1258  * Two scatter-gather lists are passed, one for the reqeust and one for the
1259  * response.
1260  */
1261 static inline int
1262 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1263                   struct scatterlist *resp, int resp_count)
1264 {
1265         return ((req_count == 1) &&
1266                 (resp_count == 1) &&
1267                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1268                   PAGE_MASK) ==
1269                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1270                                    req[0].length - 1) & PAGE_MASK)) &&
1271                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1272                   PAGE_MASK) ==
1273                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1274                                    resp[0].length - 1) & PAGE_MASK)));
1275 }
1276
1277 /**
1278  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1279  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1280  *      the request
1281  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1282  *      a struct zfcp_fsf_req
1283  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1284  *      is sent within error recovery
1285  */
1286 int
1287 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1288                  struct zfcp_erp_action *erp_action)
1289 {
1290         volatile struct qdio_buffer_element *sbale;
1291         struct zfcp_port *port;
1292         struct zfcp_adapter *adapter;
1293         struct zfcp_fsf_req *fsf_req;
1294         unsigned long lock_flags;
1295         int bytes;
1296         int ret = 0;
1297
1298         port = ct->port;
1299         adapter = port->adapter;
1300
1301         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1302                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1303                                   pool, &lock_flags, &fsf_req);
1304         if (ret < 0) {
1305                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1306                               "adapter: %s\n",
1307                               zfcp_get_busid_by_adapter(adapter));
1308                 goto failed_req;
1309         }
1310
1311         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1312         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1313                               ct->resp, ct->resp_count)){
1314                 /* both request buffer and response buffer
1315                    fit into one sbale each */
1316                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1317                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1318                 sbale[2].length = ct->req[0].length;
1319                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1320                 sbale[3].length = ct->resp[0].length;
1321                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1322         } else if (adapter->adapter_features &
1323                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1324                 /* try to use chained SBALs */
1325                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1326                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1327                                                 ct->req, ct->req_count,
1328                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1329                 if (bytes <= 0) {
1330                         ZFCP_LOG_INFO("error: creation of CT request failed "
1331                                       "on adapter %s\n",
1332                                       zfcp_get_busid_by_adapter(adapter));
1333                         if (bytes == 0)
1334                                 ret = -ENOMEM;
1335                         else
1336                                 ret = bytes;
1337
1338                         goto failed_send;
1339                 }
1340                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1341                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1342                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1343                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1344                                                 ct->resp, ct->resp_count,
1345                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1346                 if (bytes <= 0) {
1347                         ZFCP_LOG_INFO("error: creation of CT request failed "
1348                                       "on adapter %s\n",
1349                                       zfcp_get_busid_by_adapter(adapter));
1350                         if (bytes == 0)
1351                                 ret = -ENOMEM;
1352                         else
1353                                 ret = bytes;
1354
1355                         goto failed_send;
1356                 }
1357                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1358         } else {
1359                 /* reject send generic request */
1360                 ZFCP_LOG_INFO(
1361                         "error: microcode does not support chained SBALs,"
1362                         "CT request too big (adapter %s)\n",
1363                         zfcp_get_busid_by_adapter(adapter));
1364                 ret = -EOPNOTSUPP;
1365                 goto failed_send;
1366         }
1367
1368         /* settings in QTCB */
1369         fsf_req->qtcb->header.port_handle = port->handle;
1370         fsf_req->qtcb->bottom.support.service_class =
1371                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1372         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1373         fsf_req->data = (unsigned long) ct;
1374
1375         zfcp_san_dbf_event_ct_request(fsf_req);
1376
1377         if (erp_action) {
1378                 erp_action->fsf_req = fsf_req;
1379                 fsf_req->erp_action = erp_action;
1380                 zfcp_erp_start_timer(fsf_req);
1381         } else
1382                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1383
1384         ret = zfcp_fsf_req_send(fsf_req);
1385         if (ret) {
1386                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1387                                "(adapter %s, port 0x%016Lx)\n",
1388                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1389                 goto failed_send;
1390         }
1391
1392         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1393                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1394         goto out;
1395
1396  failed_send:
1397         zfcp_fsf_req_free(fsf_req);
1398         if (erp_action != NULL) {
1399                 erp_action->fsf_req = NULL;
1400         }
1401  failed_req:
1402  out:
1403         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1404                                 lock_flags);
1405         return ret;
1406 }
1407
1408 /**
1409  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1410  * @fsf_req: pointer to struct zfcp_fsf_req
1411  *
1412  * Data specific for the Generic Service request is passed using
1413  * fsf_req->data. There we find the pointer to struct zfcp_send_ct.
1414  * Usually a specific handler for the CT request is called which is
1415  * found in this structure.
1416  */
1417 static int
1418 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1419 {
1420         struct zfcp_port *port;
1421         struct zfcp_adapter *adapter;
1422         struct zfcp_send_ct *send_ct;
1423         struct fsf_qtcb_header *header;
1424         struct fsf_qtcb_bottom_support *bottom;
1425         int retval = -EINVAL;
1426         u16 subtable, rule, counter;
1427
1428         adapter = fsf_req->adapter;
1429         send_ct = (struct zfcp_send_ct *) fsf_req->data;
1430         port = send_ct->port;
1431         header = &fsf_req->qtcb->header;
1432         bottom = &fsf_req->qtcb->bottom.support;
1433
1434         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1435                 goto skip_fsfstatus;
1436
1437         /* evaluate FSF status in QTCB */
1438         switch (header->fsf_status) {
1439
1440         case FSF_GOOD:
1441                 zfcp_san_dbf_event_ct_response(fsf_req);
1442                 retval = 0;
1443                 break;
1444
1445         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1446                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1447                               "class %d.\n",
1448                               zfcp_get_busid_by_port(port),
1449                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1450                 /* stop operation for this adapter */
1451                 zfcp_erp_adapter_shutdown(adapter, 0, 123, fsf_req);
1452                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1453                 break;
1454
1455         case FSF_ADAPTER_STATUS_AVAILABLE:
1456                 switch (header->fsf_status_qual.word[0]){
1457                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1458                         /* reopening link to port */
1459                         zfcp_test_link(port);
1460                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1461                         break;
1462                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1463                         /* ERP strategy will escalate */
1464                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1465                         break;
1466                 default:
1467                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1468                                       "arrived.\n",
1469                                       header->fsf_status_qual.word[0]);
1470                         break;
1471                 }
1472                 break;
1473
1474         case FSF_ACCESS_DENIED:
1475                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1476                                 "command (adapter %s, port d_id=0x%06x)\n",
1477                                 zfcp_get_busid_by_port(port), port->d_id);
1478                 for (counter = 0; counter < 2; counter++) {
1479                         subtable = header->fsf_status_qual.halfword[counter * 2];
1480                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1481                         switch (subtable) {
1482                         case FSF_SQ_CFDC_SUBTABLE_OS:
1483                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1484                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1485                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1486                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1487                                         zfcp_act_subtable_type[subtable], rule);
1488                                 break;
1489                         }
1490                 }
1491                 zfcp_erp_port_access_denied(port, 55, fsf_req);
1492                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1493                 break;
1494
1495         case FSF_GENERIC_COMMAND_REJECTED:
1496                 ZFCP_LOG_INFO("generic service command rejected "
1497                               "(adapter %s, port d_id=0x%06x)\n",
1498                               zfcp_get_busid_by_port(port), port->d_id);
1499                 ZFCP_LOG_INFO("status qualifier:\n");
1500                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1501                               (char *) &header->fsf_status_qual,
1502                               sizeof (union fsf_status_qual));
1503                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1504                 break;
1505
1506         case FSF_PORT_HANDLE_NOT_VALID:
1507                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1508                                "0x%016Lx on adapter %s invalid. This may "
1509                                "happen occasionally.\n", port->handle,
1510                                port->wwpn, zfcp_get_busid_by_port(port));
1511                 ZFCP_LOG_INFO("status qualifier:\n");
1512                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1513                               (char *) &header->fsf_status_qual,
1514                               sizeof (union fsf_status_qual));
1515                 zfcp_erp_adapter_reopen(adapter, 0, 106, fsf_req);
1516                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1517                 break;
1518
1519         case FSF_PORT_BOXED:
1520                 ZFCP_LOG_INFO("port needs to be reopened "
1521                               "(adapter %s, port d_id=0x%06x)\n",
1522                               zfcp_get_busid_by_port(port), port->d_id);
1523                 zfcp_erp_port_boxed(port, 49, fsf_req);
1524                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1525                     | ZFCP_STATUS_FSFREQ_RETRY;
1526                 break;
1527
1528         /* following states should never occure, all cases avoided
1529            in zfcp_fsf_send_ct - but who knows ... */
1530         case FSF_PAYLOAD_SIZE_MISMATCH:
1531                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1532                               "req_buf_length=%d, resp_buf_length=%d)\n",
1533                               zfcp_get_busid_by_adapter(adapter),
1534                               bottom->req_buf_length, bottom->resp_buf_length);
1535                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1536                 break;
1537         case FSF_REQUEST_SIZE_TOO_LARGE:
1538                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1539                               "req_buf_length=%d)\n",
1540                               zfcp_get_busid_by_adapter(adapter),
1541                               bottom->req_buf_length);
1542                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1543                 break;
1544         case FSF_RESPONSE_SIZE_TOO_LARGE:
1545                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1546                               "resp_buf_length=%d)\n",
1547                               zfcp_get_busid_by_adapter(adapter),
1548                               bottom->resp_buf_length);
1549                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1550                 break;
1551         case FSF_SBAL_MISMATCH:
1552                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1553                               "resp_buf_length=%d)\n",
1554                               zfcp_get_busid_by_adapter(adapter),
1555                               bottom->req_buf_length, bottom->resp_buf_length);
1556                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1557                 break;
1558
1559        default:
1560                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1561                                 "(debug info 0x%x)\n", header->fsf_status);
1562                 break;
1563         }
1564
1565 skip_fsfstatus:
1566         send_ct->status = retval;
1567
1568         if (send_ct->handler != NULL)
1569                 send_ct->handler(send_ct->handler_data);
1570
1571         return retval;
1572 }
1573
1574 /**
1575  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1576  * @els: pointer to struct zfcp_send_els which contains all needed data for
1577  *      the command.
1578  */
1579 int
1580 zfcp_fsf_send_els(struct zfcp_send_els *els)
1581 {
1582         volatile struct qdio_buffer_element *sbale;
1583         struct zfcp_fsf_req *fsf_req;
1584         u32 d_id;
1585         struct zfcp_adapter *adapter;
1586         unsigned long lock_flags;
1587         int bytes;
1588         int ret = 0;
1589
1590         d_id = els->d_id;
1591         adapter = els->adapter;
1592
1593         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1594                                   ZFCP_REQ_AUTO_CLEANUP,
1595                                   NULL, &lock_flags, &fsf_req);
1596         if (ret < 0) {
1597                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1598                               "(adapter %s, port d_id: 0x%06x)\n",
1599                               zfcp_get_busid_by_adapter(adapter), d_id);
1600                 goto failed_req;
1601         }
1602
1603         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1604                         &els->port->status))) {
1605                 ret = -EBUSY;
1606                 goto port_blocked;
1607         }
1608
1609         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1610         if (zfcp_use_one_sbal(els->req, els->req_count,
1611                               els->resp, els->resp_count)){
1612                 /* both request buffer and response buffer
1613                    fit into one sbale each */
1614                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1615                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1616                 sbale[2].length = els->req[0].length;
1617                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1618                 sbale[3].length = els->resp[0].length;
1619                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1620         } else if (adapter->adapter_features &
1621                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1622                 /* try to use chained SBALs */
1623                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1624                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1625                                                 els->req, els->req_count,
1626                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1627                 if (bytes <= 0) {
1628                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1629                                       "(adapter %s, port d_id: 0x%06x)\n",
1630                                       zfcp_get_busid_by_adapter(adapter), d_id);
1631                         if (bytes == 0) {
1632                                 ret = -ENOMEM;
1633                         } else {
1634                                 ret = bytes;
1635                         }
1636                         goto failed_send;
1637                 }
1638                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1639                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1640                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1641                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1642                                                 els->resp, els->resp_count,
1643                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1644                 if (bytes <= 0) {
1645                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1646                                       "(adapter %s, port d_id: 0x%06x)\n",
1647                                       zfcp_get_busid_by_adapter(adapter), d_id);
1648                         if (bytes == 0) {
1649                                 ret = -ENOMEM;
1650                         } else {
1651                                 ret = bytes;
1652                         }
1653                         goto failed_send;
1654                 }
1655                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1656         } else {
1657                 /* reject request */
1658                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1659                               ", ELS request too big (adapter %s, "
1660                               "port d_id: 0x%06x)\n",
1661                               zfcp_get_busid_by_adapter(adapter), d_id);
1662                 ret = -EOPNOTSUPP;
1663                 goto failed_send;
1664         }
1665
1666         /* settings in QTCB */
1667         fsf_req->qtcb->bottom.support.d_id = d_id;
1668         fsf_req->qtcb->bottom.support.service_class =
1669                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1670         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1671         fsf_req->data = (unsigned long) els;
1672
1673         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1674
1675         zfcp_san_dbf_event_els_request(fsf_req);
1676
1677         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1678         ret = zfcp_fsf_req_send(fsf_req);
1679         if (ret) {
1680                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1681                                "(adapter %s, port d_id: 0x%06x)\n",
1682                                zfcp_get_busid_by_adapter(adapter), d_id);
1683                 goto failed_send;
1684         }
1685
1686         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1687                        "0x%06x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1688         goto out;
1689
1690  port_blocked:
1691  failed_send:
1692         zfcp_fsf_req_free(fsf_req);
1693
1694  failed_req:
1695  out:
1696         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1697                                 lock_flags);
1698
1699         return ret;
1700 }
1701
1702 /**
1703  * zfcp_fsf_send_els_handler - handler for ELS commands
1704  * @fsf_req: pointer to struct zfcp_fsf_req
1705  *
1706  * Data specific for the ELS command is passed using
1707  * fsf_req->data. There we find the pointer to struct zfcp_send_els.
1708  * Usually a specific handler for the ELS command is called which is
1709  * found in this structure.
1710  */
1711 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1712 {
1713         struct zfcp_adapter *adapter;
1714         struct zfcp_port *port;
1715         u32 d_id;
1716         struct fsf_qtcb_header *header;
1717         struct fsf_qtcb_bottom_support *bottom;
1718         struct zfcp_send_els *send_els;
1719         int retval = -EINVAL;
1720         u16 subtable, rule, counter;
1721
1722         send_els = (struct zfcp_send_els *) fsf_req->data;
1723         adapter = send_els->adapter;
1724         port = send_els->port;
1725         d_id = send_els->d_id;
1726         header = &fsf_req->qtcb->header;
1727         bottom = &fsf_req->qtcb->bottom.support;
1728
1729         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1730                 goto skip_fsfstatus;
1731
1732         switch (header->fsf_status) {
1733
1734         case FSF_GOOD:
1735                 zfcp_san_dbf_event_els_response(fsf_req);
1736                 retval = 0;
1737                 break;
1738
1739         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1740                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1741                               "class %d.\n",
1742                               zfcp_get_busid_by_adapter(adapter),
1743                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1744                 /* stop operation for this adapter */
1745                 zfcp_erp_adapter_shutdown(adapter, 0, 124, fsf_req);
1746                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1747                 break;
1748
1749         case FSF_ADAPTER_STATUS_AVAILABLE:
1750                 switch (header->fsf_status_qual.word[0]){
1751                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1752                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1753                                 zfcp_test_link(port);
1754                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1755                         break;
1756                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1757                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1758                         retval =
1759                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1760                                               (struct zfcp_ls_rjt_par *)
1761                                               &header->fsf_status_qual.word[2]);
1762                         break;
1763                 case FSF_SQ_RETRY_IF_POSSIBLE:
1764                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1765                         break;
1766                 default:
1767                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1768                                       header->fsf_status_qual.word[0]);
1769                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1770                                 (char*)header->fsf_status_qual.word, 16);
1771                 }
1772                 break;
1773
1774         case FSF_ELS_COMMAND_REJECTED:
1775                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1776                               "prohibited sending "
1777                               "(adapter: %s, port d_id: 0x%06x)\n",
1778                               zfcp_get_busid_by_adapter(adapter), d_id);
1779
1780                 break;
1781
1782         case FSF_PAYLOAD_SIZE_MISMATCH:
1783                 ZFCP_LOG_INFO(
1784                         "ELS request size and ELS response size must be either "
1785                         "both 0, or both greater than 0 "
1786                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1787                         zfcp_get_busid_by_adapter(adapter),
1788                         bottom->req_buf_length,
1789                         bottom->resp_buf_length);
1790                 break;
1791
1792         case FSF_REQUEST_SIZE_TOO_LARGE:
1793                 ZFCP_LOG_INFO(
1794                         "Length of the ELS request buffer, "
1795                         "specified in QTCB bottom, "
1796                         "exceeds the size of the buffers "
1797                         "that have been allocated for ELS request data "
1798                         "(adapter: %s, req_buf_length=%d)\n",
1799                         zfcp_get_busid_by_adapter(adapter),
1800                         bottom->req_buf_length);
1801                 break;
1802
1803         case FSF_RESPONSE_SIZE_TOO_LARGE:
1804                 ZFCP_LOG_INFO(
1805                         "Length of the ELS response buffer, "
1806                         "specified in QTCB bottom, "
1807                         "exceeds the size of the buffers "
1808                         "that have been allocated for ELS response data "
1809                         "(adapter: %s, resp_buf_length=%d)\n",
1810                         zfcp_get_busid_by_adapter(adapter),
1811                         bottom->resp_buf_length);
1812                 break;
1813
1814         case FSF_SBAL_MISMATCH:
1815                 /* should never occure, avoided in zfcp_fsf_send_els */
1816                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1817                               "resp_buf_length=%d)\n",
1818                               zfcp_get_busid_by_adapter(adapter),
1819                               bottom->req_buf_length, bottom->resp_buf_length);
1820                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1821                 break;
1822
1823         case FSF_ACCESS_DENIED:
1824                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1825                                 "(adapter %s, port d_id=0x%06x)\n",
1826                                 zfcp_get_busid_by_adapter(adapter), d_id);
1827                 for (counter = 0; counter < 2; counter++) {
1828                         subtable = header->fsf_status_qual.halfword[counter * 2];
1829                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1830                         switch (subtable) {
1831                         case FSF_SQ_CFDC_SUBTABLE_OS:
1832                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1833                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1834                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1835                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1836                                         zfcp_act_subtable_type[subtable], rule);
1837                                 break;
1838                         }
1839                 }
1840                 if (port != NULL)
1841                         zfcp_erp_port_access_denied(port, 56, fsf_req);
1842                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1843                 break;
1844
1845         default:
1846                 ZFCP_LOG_NORMAL(
1847                         "bug: An unknown FSF Status was presented "
1848                         "(adapter: %s, fsf_status=0x%08x)\n",
1849                         zfcp_get_busid_by_adapter(adapter),
1850                         header->fsf_status);
1851                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1852                 break;
1853         }
1854
1855 skip_fsfstatus:
1856         send_els->status = retval;
1857
1858         if (send_els->handler)
1859                 send_els->handler(send_els->handler_data);
1860
1861         return retval;
1862 }
1863
1864 int
1865 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1866 {
1867         volatile struct qdio_buffer_element *sbale;
1868         struct zfcp_fsf_req *fsf_req;
1869         struct zfcp_adapter *adapter = erp_action->adapter;
1870         unsigned long lock_flags;
1871         int retval;
1872
1873         /* setup new FSF request */
1874         retval = zfcp_fsf_req_create(adapter,
1875                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1876                                      ZFCP_REQ_AUTO_CLEANUP,
1877                                      adapter->pool.fsf_req_erp,
1878                                      &lock_flags, &fsf_req);
1879         if (retval) {
1880                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1881                               "data request for adapter %s.\n",
1882                               zfcp_get_busid_by_adapter(adapter));
1883                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1884                                         lock_flags);
1885                 return retval;
1886         }
1887
1888         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1889         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1890         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1891
1892         fsf_req->qtcb->bottom.config.feature_selection =
1893                         FSF_FEATURE_CFDC |
1894                         FSF_FEATURE_LUN_SHARING |
1895                         FSF_FEATURE_NOTIFICATION_LOST |
1896                         FSF_FEATURE_UPDATE_ALERT;
1897         fsf_req->erp_action = erp_action;
1898         erp_action->fsf_req = fsf_req;
1899
1900         zfcp_erp_start_timer(fsf_req);
1901         retval = zfcp_fsf_req_send(fsf_req);
1902         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1903                                 lock_flags);
1904         if (retval) {
1905                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1906                               "data command on the adapter %s\n",
1907                               zfcp_get_busid_by_adapter(adapter));
1908                 zfcp_fsf_req_free(fsf_req);
1909                 erp_action->fsf_req = NULL;
1910         }
1911         else
1912                 ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1913                                "(adapter %s)\n",
1914                                zfcp_get_busid_by_adapter(adapter));
1915
1916         return retval;
1917 }
1918
1919 int
1920 zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1921                                 struct fsf_qtcb_bottom_config *data)
1922 {
1923         volatile struct qdio_buffer_element *sbale;
1924         struct zfcp_fsf_req *fsf_req;
1925         unsigned long lock_flags;
1926         int retval;
1927
1928         /* setup new FSF request */
1929         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1930                                      ZFCP_WAIT_FOR_SBAL, NULL, &lock_flags,
1931                                      &fsf_req);
1932         if (retval) {
1933                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1934                               "data request for adapter %s.\n",
1935                               zfcp_get_busid_by_adapter(adapter));
1936                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1937                                         lock_flags);
1938                 return retval;
1939         }
1940
1941         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1942         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1943         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1944
1945         fsf_req->qtcb->bottom.config.feature_selection =
1946                         FSF_FEATURE_CFDC |
1947                         FSF_FEATURE_LUN_SHARING |
1948                         FSF_FEATURE_NOTIFICATION_LOST |
1949                         FSF_FEATURE_UPDATE_ALERT;
1950
1951         if (data)
1952                 fsf_req->data = (unsigned long) data;
1953
1954         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1955         retval = zfcp_fsf_req_send(fsf_req);
1956         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1957                                 lock_flags);
1958         if (retval)
1959                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1960                               "data command on the adapter %s\n",
1961                               zfcp_get_busid_by_adapter(adapter));
1962         else
1963                 wait_event(fsf_req->completion_wq,
1964                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1965
1966         zfcp_fsf_req_free(fsf_req);
1967
1968         return retval;
1969 }
1970
1971 /**
1972  * zfcp_fsf_exchange_config_evaluate
1973  * @fsf_req: fsf_req which belongs to xchg config data request
1974  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1975  *
1976  * returns: -EIO on error, 0 otherwise
1977  */
1978 static int
1979 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
1980 {
1981         struct fsf_qtcb_bottom_config *bottom;
1982         struct zfcp_adapter *adapter = fsf_req->adapter;
1983         struct Scsi_Host *shost = adapter->scsi_host;
1984
1985         bottom = &fsf_req->qtcb->bottom.config;
1986         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
1987                        bottom->low_qtcb_version, bottom->high_qtcb_version);
1988         adapter->fsf_lic_version = bottom->lic_version;
1989         adapter->adapter_features = bottom->adapter_features;
1990         adapter->connection_features = bottom->connection_features;
1991         adapter->peer_wwpn = 0;
1992         adapter->peer_wwnn = 0;
1993         adapter->peer_d_id = 0;
1994
1995         if (xchg_ok) {
1996
1997                 if (fsf_req->data)
1998                         memcpy((struct fsf_qtcb_bottom_config *) fsf_req->data,
1999                                 bottom, sizeof (struct fsf_qtcb_bottom_config));
2000
2001                 fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
2002                 fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
2003                 fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
2004                 fc_host_speed(shost) = bottom->fc_link_speed;
2005                 fc_host_supported_classes(shost) =
2006                                 FC_COS_CLASS2 | FC_COS_CLASS3;
2007                 adapter->hydra_version = bottom->adapter_type;
2008                 if (fc_host_permanent_port_name(shost) == -1)
2009                         fc_host_permanent_port_name(shost) =
2010                                 fc_host_port_name(shost);
2011                 if (bottom->fc_topology == FSF_TOPO_P2P) {
2012                         adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2013                         adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2014                         adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2015                         fc_host_port_type(shost) = FC_PORTTYPE_PTP;
2016                 } else if (bottom->fc_topology == FSF_TOPO_FABRIC)
2017                         fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
2018                 else if (bottom->fc_topology == FSF_TOPO_AL)
2019                         fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
2020                 else
2021                         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2022         } else {
2023                 fc_host_node_name(shost) = 0;
2024                 fc_host_port_name(shost) = 0;
2025                 fc_host_port_id(shost) = 0;
2026                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
2027                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2028                 adapter->hydra_version = 0;
2029         }
2030
2031         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
2032                 adapter->hardware_version = bottom->hardware_version;
2033                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
2034                        min(FC_SERIAL_NUMBER_SIZE, 17));
2035                 EBCASC(fc_host_serial_number(shost),
2036                        min(FC_SERIAL_NUMBER_SIZE, 17));
2037         }
2038
2039         if (fsf_req->erp_action)
2040                 ZFCP_LOG_NORMAL("The adapter %s reported the following "
2041                                 "characteristics:\n"
2042                                 "WWNN 0x%016Lx, WWPN 0x%016Lx, "
2043                                 "S_ID 0x%06x,\n"
2044                                 "adapter version 0x%x, "
2045                                 "LIC version 0x%x, "
2046                                 "FC link speed %d Gb/s\n",
2047                                 zfcp_get_busid_by_adapter(adapter),
2048                                 (wwn_t) fc_host_node_name(shost),
2049                                 (wwn_t) fc_host_port_name(shost),
2050                                 fc_host_port_id(shost),
2051                                 adapter->hydra_version,
2052                                 adapter->fsf_lic_version,
2053                                 fc_host_speed(shost));
2054         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2055                 ZFCP_LOG_NORMAL("error: the adapter %s "
2056                                 "only supports newer control block "
2057                                 "versions in comparison to this device "
2058                                 "driver (try updated device driver)\n",
2059                                 zfcp_get_busid_by_adapter(adapter));
2060                 zfcp_erp_adapter_shutdown(adapter, 0, 125, fsf_req);
2061                 return -EIO;
2062         }
2063         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2064                 ZFCP_LOG_NORMAL("error: the adapter %s "
2065                                 "only supports older control block "
2066                                 "versions than this device driver uses"
2067                                 "(consider a microcode upgrade)\n",
2068                                 zfcp_get_busid_by_adapter(adapter));
2069                 zfcp_erp_adapter_shutdown(adapter, 0, 126, fsf_req);
2070                 return -EIO;
2071         }
2072         return 0;
2073 }
2074
2075 /**
2076  * function:    zfcp_fsf_exchange_config_data_handler
2077  *
2078  * purpose:     is called for finished Exchange Configuration Data command
2079  *
2080  * returns:
2081  */
2082 static int
2083 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2084 {
2085         struct fsf_qtcb_bottom_config *bottom;
2086         struct zfcp_adapter *adapter = fsf_req->adapter;
2087         struct fsf_qtcb *qtcb = fsf_req->qtcb;
2088
2089         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2090                 return -EIO;
2091
2092         switch (qtcb->header.fsf_status) {
2093
2094         case FSF_GOOD:
2095                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2096                         return -EIO;
2097
2098                 switch (fc_host_port_type(adapter->scsi_host)) {
2099                 case FC_PORTTYPE_PTP:
2100                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2101                                         "configuration detected at adapter %s\n"
2102                                         "Peer WWNN 0x%016llx, "
2103                                         "peer WWPN 0x%016llx, "
2104                                         "peer d_id 0x%06x\n",
2105                                         zfcp_get_busid_by_adapter(adapter),
2106                                         adapter->peer_wwnn,
2107                                         adapter->peer_wwpn,
2108                                         adapter->peer_d_id);
2109                         break;
2110                 case FC_PORTTYPE_NLPORT:
2111                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2112                                         "topology detected at adapter %s "
2113                                         "unsupported, shutting down adapter\n",
2114                                         zfcp_get_busid_by_adapter(adapter));
2115                         zfcp_erp_adapter_shutdown(adapter, 0, 127, fsf_req);
2116                         return -EIO;
2117                 case FC_PORTTYPE_NPORT:
2118                         if (fsf_req->erp_action)
2119                                 ZFCP_LOG_NORMAL("Switched fabric fibrechannel "
2120                                                 "network detected at adapter "
2121                                                 "%s.\n",
2122                                         zfcp_get_busid_by_adapter(adapter));
2123                         break;
2124                 default:
2125                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2126                                         "reported by the exchange "
2127                                         "configuration command for "
2128                                         "the adapter %s is not "
2129                                         "of a type known to the zfcp "
2130                                         "driver, shutting down adapter\n",
2131                                         zfcp_get_busid_by_adapter(adapter));
2132                         zfcp_erp_adapter_shutdown(adapter, 0, 128, fsf_req);
2133                         return -EIO;
2134                 }
2135                 bottom = &qtcb->bottom.config;
2136                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2137                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2138                                         "allowed by the adapter %s "
2139                                         "is lower than the minimum "
2140                                         "required by the driver (%ld bytes).\n",
2141                                         bottom->max_qtcb_size,
2142                                         zfcp_get_busid_by_adapter(adapter),
2143                                         sizeof(struct fsf_qtcb));
2144                         zfcp_erp_adapter_shutdown(adapter, 0, 129, fsf_req);
2145                         return -EIO;
2146                 }
2147                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2148                                 &adapter->status);
2149                 break;
2150         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2151                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2152                         return -EIO;
2153
2154                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2155                                 &adapter->status);
2156
2157                 zfcp_fsf_link_down_info_eval(fsf_req, 42,
2158                         &qtcb->header.fsf_status_qual.link_down_info);
2159                 break;
2160         default:
2161                 zfcp_erp_adapter_shutdown(adapter, 0, 130, fsf_req);
2162                 return -EIO;
2163         }
2164         return 0;
2165 }
2166
2167 /**
2168  * zfcp_fsf_exchange_port_data - request information about local port
2169  * @erp_action: ERP action for the adapter for which port data is requested
2170  */
2171 int
2172 zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
2173 {
2174         volatile struct qdio_buffer_element *sbale;
2175         struct zfcp_fsf_req *fsf_req;
2176         struct zfcp_adapter *adapter = erp_action->adapter;
2177         unsigned long lock_flags;
2178         int retval;
2179
2180         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2181                 ZFCP_LOG_INFO("error: exchange port data "
2182                               "command not supported by adapter %s\n",
2183                               zfcp_get_busid_by_adapter(adapter));
2184                 return -EOPNOTSUPP;
2185         }
2186
2187         /* setup new FSF request */
2188         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2189                                      ZFCP_REQ_AUTO_CLEANUP,
2190                                      adapter->pool.fsf_req_erp,
2191                                      &lock_flags, &fsf_req);
2192         if (retval) {
2193                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2194                               "exchange port data request for "
2195                               "the adapter %s.\n",
2196                               zfcp_get_busid_by_adapter(adapter));
2197                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2198                                         lock_flags);
2199                 return retval;
2200         }
2201
2202         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2203         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2204         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2205
2206         erp_action->fsf_req = fsf_req;
2207         fsf_req->erp_action = erp_action;
2208         zfcp_erp_start_timer(fsf_req);
2209
2210         retval = zfcp_fsf_req_send(fsf_req);
2211         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2212
2213         if (retval) {
2214                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2215                               "command on the adapter %s\n",
2216                               zfcp_get_busid_by_adapter(adapter));
2217                 zfcp_fsf_req_free(fsf_req);
2218                 erp_action->fsf_req = NULL;
2219         }
2220         else
2221                 ZFCP_LOG_DEBUG("exchange port data request initiated "
2222                                "(adapter %s)\n",
2223                                zfcp_get_busid_by_adapter(adapter));
2224         return retval;
2225 }
2226
2227
2228 /**
2229  * zfcp_fsf_exchange_port_data_sync - request information about local port
2230  * and wait until information is ready
2231  */
2232 int
2233 zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
2234                                 struct fsf_qtcb_bottom_port *data)
2235 {
2236         volatile struct qdio_buffer_element *sbale;
2237         struct zfcp_fsf_req *fsf_req;
2238         unsigned long lock_flags;
2239         int retval;
2240
2241         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2242                 ZFCP_LOG_INFO("error: exchange port data "
2243                               "command not supported by adapter %s\n",
2244                               zfcp_get_busid_by_adapter(adapter));
2245                 return -EOPNOTSUPP;
2246         }
2247
2248         /* setup new FSF request */
2249         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2250                                 0, NULL, &lock_flags, &fsf_req);
2251         if (retval) {
2252                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2253                               "exchange port data request for "
2254                               "the adapter %s.\n",
2255                               zfcp_get_busid_by_adapter(adapter));
2256                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2257                                         lock_flags);
2258                 return retval;
2259         }
2260
2261         if (data)
2262                 fsf_req->data = (unsigned long) data;
2263
2264         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2265         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2266         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2267
2268         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
2269         retval = zfcp_fsf_req_send(fsf_req);
2270         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2271
2272         if (retval)
2273                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2274                               "command on the adapter %s\n",
2275                               zfcp_get_busid_by_adapter(adapter));
2276         else
2277                 wait_event(fsf_req->completion_wq,
2278                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2279
2280         zfcp_fsf_req_free(fsf_req);
2281
2282         return retval;
2283 }
2284
2285 /**
2286  * zfcp_fsf_exchange_port_evaluate
2287  * @fsf_req: fsf_req which belongs to xchg port data request
2288  * @xchg_ok: specifies if xchg port data was incomplete or complete (0/1)
2289  */
2290 static void
2291 zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
2292 {
2293         struct zfcp_adapter *adapter;
2294         struct fsf_qtcb_bottom_port *bottom;
2295         struct Scsi_Host *shost;
2296
2297         adapter = fsf_req->adapter;
2298         bottom = &fsf_req->qtcb->bottom.port;
2299         shost = adapter->scsi_host;
2300
2301         if (fsf_req->data)
2302                 memcpy((struct fsf_qtcb_bottom_port*) fsf_req->data, bottom,
2303                         sizeof(struct fsf_qtcb_bottom_port));
2304
2305         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
2306                 fc_host_permanent_port_name(shost) = bottom->wwpn;
2307         else
2308                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
2309         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
2310         fc_host_supported_speeds(shost) = bottom->supported_speed;
2311 }
2312
2313 /**
2314  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2315  * @fsf_req: pointer to struct zfcp_fsf_req
2316  */
2317 static void
2318 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2319 {
2320         struct zfcp_adapter *adapter;
2321         struct fsf_qtcb *qtcb;
2322
2323         adapter = fsf_req->adapter;
2324         qtcb = fsf_req->qtcb;
2325
2326         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2327                 return;
2328
2329         switch (qtcb->header.fsf_status) {
2330         case FSF_GOOD:
2331                 zfcp_fsf_exchange_port_evaluate(fsf_req, 1);
2332                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2333                 break;
2334         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2335                 zfcp_fsf_exchange_port_evaluate(fsf_req, 0);
2336                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2337                 zfcp_fsf_link_down_info_eval(fsf_req, 43,
2338                         &qtcb->header.fsf_status_qual.link_down_info);
2339                 break;
2340         }
2341 }
2342
2343
2344 /*
2345  * function:    zfcp_fsf_open_port
2346  *
2347  * purpose:
2348  *
2349  * returns:     address of initiated FSF request
2350  *              NULL - request could not be initiated
2351  */
2352 int
2353 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2354 {
2355         volatile struct qdio_buffer_element *sbale;
2356         struct zfcp_fsf_req *fsf_req;
2357         unsigned long lock_flags;
2358         int retval = 0;
2359
2360         /* setup new FSF request */
2361         retval = zfcp_fsf_req_create(erp_action->adapter,
2362                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2363                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2364                                      erp_action->adapter->pool.fsf_req_erp,
2365                                      &lock_flags, &fsf_req);
2366         if (retval < 0) {
2367                 ZFCP_LOG_INFO("error: Could not create open port request "
2368                               "for port 0x%016Lx on adapter %s.\n",
2369                               erp_action->port->wwpn,
2370                               zfcp_get_busid_by_adapter(erp_action->adapter));
2371                 goto out;
2372         }
2373
2374         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2375         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2376         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2377
2378         fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2379         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2380         fsf_req->data = (unsigned long) erp_action->port;
2381         fsf_req->erp_action = erp_action;
2382         erp_action->fsf_req = fsf_req;
2383
2384         zfcp_erp_start_timer(fsf_req);
2385         retval = zfcp_fsf_req_send(fsf_req);
2386         if (retval) {
2387                 ZFCP_LOG_INFO("error: Could not send open port request for "
2388                               "port 0x%016Lx on adapter %s.\n",
2389                               erp_action->port->wwpn,
2390                               zfcp_get_busid_by_adapter(erp_action->adapter));
2391                 zfcp_fsf_req_free(fsf_req);
2392                 erp_action->fsf_req = NULL;
2393                 goto out;
2394         }
2395
2396         ZFCP_LOG_DEBUG("open port request initiated "
2397                        "(adapter %s,  port 0x%016Lx)\n",
2398                        zfcp_get_busid_by_adapter(erp_action->adapter),
2399                        erp_action->port->wwpn);
2400  out:
2401         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2402                                 lock_flags);
2403         return retval;
2404 }
2405
2406 /*
2407  * function:    zfcp_fsf_open_port_handler
2408  *
2409  * purpose:     is called for finished Open Port command
2410  *
2411  * returns:
2412  */
2413 static int
2414 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2415 {
2416         int retval = -EINVAL;
2417         struct zfcp_port *port;
2418         struct fsf_plogi *plogi;
2419         struct fsf_qtcb_header *header;
2420         u16 subtable, rule, counter;
2421
2422         port = (struct zfcp_port *) fsf_req->data;
2423         header = &fsf_req->qtcb->header;
2424
2425         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2426                 /* don't change port status in our bookkeeping */
2427                 goto skip_fsfstatus;
2428         }
2429
2430         /* evaluate FSF status in QTCB */
2431         switch (header->fsf_status) {
2432
2433         case FSF_PORT_ALREADY_OPEN:
2434                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2435                                 "is already open.\n",
2436                                 port->wwpn, zfcp_get_busid_by_port(port));
2437                 /*
2438                  * This is a bug, however operation should continue normally
2439                  * if it is simply ignored
2440                  */
2441                 break;
2442
2443         case FSF_ACCESS_DENIED:
2444                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2445                                 "on adapter %s\n",
2446                                 port->wwpn, zfcp_get_busid_by_port(port));
2447                 for (counter = 0; counter < 2; counter++) {
2448                         subtable = header->fsf_status_qual.halfword[counter * 2];
2449                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2450                         switch (subtable) {
2451                         case FSF_SQ_CFDC_SUBTABLE_OS:
2452                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2453                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2454                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2455                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2456                                         zfcp_act_subtable_type[subtable], rule);
2457                                 break;
2458                         }
2459                 }
2460                 zfcp_erp_port_access_denied(port, 57, fsf_req);
2461                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2462                 break;
2463
2464         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2465                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2466                               "The remote port 0x%016Lx on adapter %s "
2467                               "could not be opened. Disabling it.\n",
2468                               port->wwpn, zfcp_get_busid_by_port(port));
2469                 zfcp_erp_port_failed(port, 31, fsf_req);
2470                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2471                 break;
2472
2473         case FSF_ADAPTER_STATUS_AVAILABLE:
2474                 switch (header->fsf_status_qual.word[0]) {
2475                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2476                         /* ERP strategy will escalate */
2477                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2478                         break;
2479                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2480                         /* ERP strategy will escalate */
2481                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2482                         break;
2483                 case FSF_SQ_NO_RETRY_POSSIBLE:
2484                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2485                                         "adapter %s could not be opened. "
2486                                         "Disabling it.\n",
2487                                         port->wwpn,
2488                                         zfcp_get_busid_by_port(port));
2489                         zfcp_erp_port_failed(port, 32, fsf_req);
2490                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2491                         break;
2492                 default:
2493                         ZFCP_LOG_NORMAL
2494                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2495                              header->fsf_status_qual.word[0]);
2496                         break;
2497                 }
2498                 break;
2499
2500         case FSF_GOOD:
2501                 /* save port handle assigned by FSF */
2502                 port->handle = header->port_handle;
2503                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2504                               "was opened, it's port handle is 0x%x\n",
2505                               port->wwpn, zfcp_get_busid_by_port(port),
2506                               port->handle);
2507                 /* mark port as open */
2508                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2509                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2510                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2511                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2512                                   &port->status);
2513                 retval = 0;
2514                 /* check whether D_ID has changed during open */
2515                 /*
2516                  * FIXME: This check is not airtight, as the FCP channel does
2517                  * not monitor closures of target port connections caused on
2518                  * the remote side. Thus, they might miss out on invalidating
2519                  * locally cached WWPNs (and other N_Port parameters) of gone
2520                  * target ports. So, our heroic attempt to make things safe
2521                  * could be undermined by 'open port' response data tagged with
2522                  * obsolete WWPNs. Another reason to monitor potential
2523                  * connection closures ourself at least (by interpreting
2524                  * incoming ELS' and unsolicited status). It just crosses my
2525                  * mind that one should be able to cross-check by means of
2526                  * another GID_PN straight after a port has been opened.
2527                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2528                  */
2529                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2530                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2531                 {
2532                         if (fsf_req->qtcb->bottom.support.els1_length <
2533                             sizeof (struct fsf_plogi)) {
2534                                 ZFCP_LOG_INFO(
2535                                         "warning: insufficient length of "
2536                                         "PLOGI payload (%i)\n",
2537                                         fsf_req->qtcb->bottom.support.els1_length);
2538                                 /* skip sanity check and assume wwpn is ok */
2539                         } else {
2540                                 if (plogi->serv_param.wwpn != port->wwpn) {
2541                                         ZFCP_LOG_INFO("warning: d_id of port "
2542                                                       "0x%016Lx changed during "
2543                                                       "open\n", port->wwpn);
2544                                         atomic_clear_mask(
2545                                                 ZFCP_STATUS_PORT_DID_DID,
2546                                                 &port->status);
2547                                 } else {
2548                                         port->wwnn = plogi->serv_param.wwnn;
2549                                         zfcp_plogi_evaluate(port, plogi);
2550                                 }
2551                         }
2552                 }
2553                 break;
2554
2555         case FSF_UNKNOWN_OP_SUBTYPE:
2556                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2557                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2558                               "op_subtype=0x%x)\n",
2559                               zfcp_get_busid_by_port(port),
2560                               fsf_req->qtcb->bottom.support.operation_subtype);
2561                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2562                 break;
2563
2564         default:
2565                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2566                                 "(debug info 0x%x)\n",
2567                                 header->fsf_status);
2568                 break;
2569         }
2570
2571  skip_fsfstatus:
2572         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2573         return retval;
2574 }
2575
2576 /*
2577  * function:    zfcp_fsf_close_port
2578  *
2579  * purpose:     submit FSF command "close port"
2580  *
2581  * returns:     address of initiated FSF request
2582  *              NULL - request could not be initiated
2583  */
2584 int
2585 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2586 {
2587         volatile struct qdio_buffer_element *sbale;
2588         struct zfcp_fsf_req *fsf_req;
2589         unsigned long lock_flags;
2590         int retval = 0;
2591
2592         /* setup new FSF request */
2593         retval = zfcp_fsf_req_create(erp_action->adapter,
2594                                      FSF_QTCB_CLOSE_PORT,
2595                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2596                                      erp_action->adapter->pool.fsf_req_erp,
2597                                      &lock_flags, &fsf_req);
2598         if (retval < 0) {
2599                 ZFCP_LOG_INFO("error: Could not create a close port request "
2600                               "for port 0x%016Lx on adapter %s.\n",
2601                               erp_action->port->wwpn,
2602                               zfcp_get_busid_by_adapter(erp_action->adapter));
2603                 goto out;
2604         }
2605
2606         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2607         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2608         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2609
2610         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2611         fsf_req->data = (unsigned long) erp_action->port;
2612         fsf_req->erp_action = erp_action;
2613         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2614         fsf_req->erp_action = erp_action;
2615         erp_action->fsf_req = fsf_req;
2616
2617         zfcp_erp_start_timer(fsf_req);
2618         retval = zfcp_fsf_req_send(fsf_req);
2619         if (retval) {
2620                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2621                               "port 0x%016Lx on adapter %s.\n",
2622                               erp_action->port->wwpn,
2623                               zfcp_get_busid_by_adapter(erp_action->adapter));
2624                 zfcp_fsf_req_free(fsf_req);
2625                 erp_action->fsf_req = NULL;
2626                 goto out;
2627         }
2628
2629         ZFCP_LOG_TRACE("close port request initiated "
2630                        "(adapter %s, port 0x%016Lx)\n",
2631                        zfcp_get_busid_by_adapter(erp_action->adapter),
2632                        erp_action->port->wwpn);
2633  out:
2634         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2635                                 lock_flags);
2636         return retval;
2637 }
2638
2639 /*
2640  * function:    zfcp_fsf_close_port_handler
2641  *
2642  * purpose:     is called for finished Close Port FSF command
2643  *
2644  * returns:
2645  */
2646 static int
2647 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2648 {
2649         int retval = -EINVAL;
2650         struct zfcp_port *port;
2651
2652         port = (struct zfcp_port *) fsf_req->data;
2653
2654         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2655                 /* don't change port status in our bookkeeping */
2656                 goto skip_fsfstatus;
2657         }
2658
2659         /* evaluate FSF status in QTCB */
2660         switch (fsf_req->qtcb->header.fsf_status) {
2661
2662         case FSF_PORT_HANDLE_NOT_VALID:
2663                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2664                               "0x%016Lx on adapter %s invalid. This may happen "
2665                               "occasionally.\n", port->handle,
2666                               port->wwpn, zfcp_get_busid_by_port(port));
2667                 ZFCP_LOG_DEBUG("status qualifier:\n");
2668                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2669                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2670                               sizeof (union fsf_status_qual));
2671                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, fsf_req);
2672                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2673                 break;
2674
2675         case FSF_ADAPTER_STATUS_AVAILABLE:
2676                 /* Note: FSF has actually closed the port in this case.
2677                  * The status code is just daft. Fingers crossed for a change
2678                  */
2679                 retval = 0;
2680                 break;
2681
2682         case FSF_GOOD:
2683                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2684                                "port handle 0x%x\n", port->wwpn,
2685                                zfcp_get_busid_by_port(port), port->handle);
2686                 zfcp_erp_modify_port_status(port, 33, fsf_req,
2687                                             ZFCP_STATUS_COMMON_OPEN,
2688                                             ZFCP_CLEAR);
2689                 retval = 0;
2690                 break;
2691
2692         default:
2693                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2694                                 "(debug info 0x%x)\n",
2695                                 fsf_req->qtcb->header.fsf_status);
2696                 break;
2697         }
2698
2699  skip_fsfstatus:
2700         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2701         return retval;
2702 }
2703
2704 /*
2705  * function:    zfcp_fsf_close_physical_port
2706  *
2707  * purpose:     submit FSF command "close physical port"
2708  *
2709  * returns:     address of initiated FSF request
2710  *              NULL - request could not be initiated
2711  */
2712 int
2713 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2714 {
2715         volatile struct qdio_buffer_element *sbale;
2716         struct zfcp_fsf_req *fsf_req;
2717         unsigned long lock_flags;
2718         int retval = 0;
2719
2720         /* setup new FSF request */
2721         retval = zfcp_fsf_req_create(erp_action->adapter,
2722                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2723                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2724                                      erp_action->adapter->pool.fsf_req_erp,
2725                                      &lock_flags, &fsf_req);
2726         if (retval < 0) {
2727                 ZFCP_LOG_INFO("error: Could not create close physical port "
2728                               "request (adapter %s, port 0x%016Lx)\n",
2729                               zfcp_get_busid_by_adapter(erp_action->adapter),
2730                               erp_action->port->wwpn);
2731
2732                 goto out;
2733         }
2734
2735         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2736         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2737         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2738
2739         /* mark port as being closed */
2740         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2741                         &erp_action->port->status);
2742         /* save a pointer to this port */
2743         fsf_req->data = (unsigned long) erp_action->port;
2744         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2745         fsf_req->erp_action = erp_action;
2746         erp_action->fsf_req = fsf_req;
2747
2748         zfcp_erp_start_timer(fsf_req);
2749         retval = zfcp_fsf_req_send(fsf_req);
2750         if (retval) {
2751                 ZFCP_LOG_INFO("error: Could not send close physical port "
2752                               "request (adapter %s, port 0x%016Lx)\n",
2753                               zfcp_get_busid_by_adapter(erp_action->adapter),
2754                               erp_action->port->wwpn);
2755                 zfcp_fsf_req_free(fsf_req);
2756                 erp_action->fsf_req = NULL;
2757                 goto out;
2758         }
2759
2760         ZFCP_LOG_TRACE("close physical port request initiated "
2761                        "(adapter %s, port 0x%016Lx)\n",
2762                        zfcp_get_busid_by_adapter(erp_action->adapter),
2763                        erp_action->port->wwpn);
2764  out:
2765         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2766                                 lock_flags);
2767         return retval;
2768 }
2769
2770 /*
2771  * function:    zfcp_fsf_close_physical_port_handler
2772  *
2773  * purpose:     is called for finished Close Physical Port FSF command
2774  *
2775  * returns:
2776  */
2777 static int
2778 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2779 {
2780         int retval = -EINVAL;
2781         struct zfcp_port *port;
2782         struct zfcp_unit *unit;
2783         struct fsf_qtcb_header *header;
2784         u16 subtable, rule, counter;
2785
2786         port = (struct zfcp_port *) fsf_req->data;
2787         header = &fsf_req->qtcb->header;
2788
2789         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2790                 /* don't change port status in our bookkeeping */
2791                 goto skip_fsfstatus;
2792         }
2793
2794         /* evaluate FSF status in QTCB */
2795         switch (header->fsf_status) {
2796
2797         case FSF_PORT_HANDLE_NOT_VALID:
2798                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2799                               "(adapter %s, port 0x%016Lx). "
2800                               "This may happen occasionally.\n",
2801                               port->handle,
2802                               zfcp_get_busid_by_port(port),
2803                               port->wwpn);
2804                 ZFCP_LOG_DEBUG("status qualifier:\n");
2805                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2806                               (char *) &header->fsf_status_qual,
2807                               sizeof (union fsf_status_qual));
2808                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, fsf_req);
2809                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2810                 break;
2811
2812         case FSF_ACCESS_DENIED:
2813                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2814                                 "physical port 0x%016Lx on adapter %s\n",
2815                                 port->wwpn, zfcp_get_busid_by_port(port));
2816                 for (counter = 0; counter < 2; counter++) {
2817                         subtable = header->fsf_status_qual.halfword[counter * 2];
2818                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2819                         switch (subtable) {
2820                         case FSF_SQ_CFDC_SUBTABLE_OS:
2821                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2822                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2823                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2824                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2825                                         zfcp_act_subtable_type[subtable], rule);
2826                                 break;
2827                         }
2828                 }
2829                 zfcp_erp_port_access_denied(port, 58, fsf_req);
2830                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2831                 break;
2832
2833         case FSF_PORT_BOXED:
2834                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2835                                "%s needs to be reopened but it was attempted "
2836                                "to close it physically.\n",
2837                                port->wwpn,
2838                                zfcp_get_busid_by_port(port));
2839                 zfcp_erp_port_boxed(port, 50, fsf_req);
2840                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2841                         ZFCP_STATUS_FSFREQ_RETRY;
2842
2843                 /* can't use generic zfcp_erp_modify_port_status because
2844                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
2845                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2846                 list_for_each_entry(unit, &port->unit_list_head, list)
2847                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
2848                                           &unit->status);
2849                 break;
2850
2851         case FSF_ADAPTER_STATUS_AVAILABLE:
2852                 switch (header->fsf_status_qual.word[0]) {
2853                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2854                         /* This will now be escalated by ERP */
2855                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2856                         break;
2857                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2858                         /* ERP strategy will escalate */
2859                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2860                         break;
2861                 default:
2862                         ZFCP_LOG_NORMAL
2863                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2864                              header->fsf_status_qual.word[0]);
2865                         break;
2866                 }
2867                 break;
2868
2869         case FSF_GOOD:
2870                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2871                                "physically closed, port handle 0x%x\n",
2872                                port->wwpn,
2873                                zfcp_get_busid_by_port(port), port->handle);
2874                 /* can't use generic zfcp_erp_modify_port_status because
2875                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2876                  */
2877                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2878                 list_for_each_entry(unit, &port->unit_list_head, list)
2879                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2880                 retval = 0;
2881                 break;
2882
2883         default:
2884                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2885                                 "(debug info 0x%x)\n",
2886                                 header->fsf_status);
2887                 break;
2888         }
2889
2890  skip_fsfstatus:
2891         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2892         return retval;
2893 }
2894
2895 /*
2896  * function:    zfcp_fsf_open_unit
2897  *
2898  * purpose:
2899  *
2900  * returns:
2901  *
2902  * assumptions: This routine does not check whether the associated
2903  *              remote port has already been opened. This should be
2904  *              done by calling routines. Otherwise some status
2905  *              may be presented by FSF
2906  */
2907 int
2908 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2909 {
2910         volatile struct qdio_buffer_element *sbale;
2911         struct zfcp_fsf_req *fsf_req;
2912         unsigned long lock_flags;
2913         int retval = 0;
2914
2915         /* setup new FSF request */
2916         retval = zfcp_fsf_req_create(erp_action->adapter,
2917                                      FSF_QTCB_OPEN_LUN,
2918                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2919                                      erp_action->adapter->pool.fsf_req_erp,
2920                                      &lock_flags, &fsf_req);
2921         if (retval < 0) {
2922                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2923                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2924                               erp_action->unit->fcp_lun,
2925                               erp_action->unit->port->wwpn,
2926                               zfcp_get_busid_by_adapter(erp_action->adapter));
2927                 goto out;
2928         }
2929
2930         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2931         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2932         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2933
2934         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2935         fsf_req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
2936         if (!(erp_action->adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2937                 fsf_req->qtcb->bottom.support.option =
2938                         FSF_OPEN_LUN_SUPPRESS_BOXING;
2939         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2940         fsf_req->data = (unsigned long) erp_action->unit;
2941         fsf_req->erp_action = erp_action;
2942         erp_action->fsf_req = fsf_req;
2943
2944         zfcp_erp_start_timer(fsf_req);
2945         retval = zfcp_fsf_req_send(erp_action->fsf_req);
2946         if (retval) {
2947                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2948                               "on the adapter %s, port 0x%016Lx for "
2949                               "unit 0x%016Lx\n",
2950                               zfcp_get_busid_by_adapter(erp_action->adapter),
2951                               erp_action->port->wwpn,
2952                               erp_action->unit->fcp_lun);
2953                 zfcp_fsf_req_free(fsf_req);
2954                 erp_action->fsf_req = NULL;
2955                 goto out;
2956         }
2957
2958         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2959                        "port 0x%016Lx, unit 0x%016Lx)\n",
2960                        zfcp_get_busid_by_adapter(erp_action->adapter),
2961                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2962  out:
2963         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2964                                 lock_flags);
2965         return retval;
2966 }
2967
2968 /*
2969  * function:    zfcp_fsf_open_unit_handler
2970  *
2971  * purpose:     is called for finished Open LUN command
2972  *
2973  * returns:
2974  */
2975 static int
2976 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2977 {
2978         int retval = -EINVAL;
2979         struct zfcp_adapter *adapter;
2980         struct zfcp_unit *unit;
2981         struct fsf_qtcb_header *header;
2982         struct fsf_qtcb_bottom_support *bottom;
2983         struct fsf_queue_designator *queue_designator;
2984         u16 subtable, rule, counter;
2985         int exclusive, readwrite;
2986
2987         unit = (struct zfcp_unit *) fsf_req->data;
2988
2989         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2990                 /* don't change unit status in our bookkeeping */
2991                 goto skip_fsfstatus;
2992         }
2993
2994         adapter = fsf_req->adapter;
2995         header = &fsf_req->qtcb->header;
2996         bottom = &fsf_req->qtcb->bottom.support;
2997         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
2998
2999         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
3000                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
3001                           ZFCP_STATUS_UNIT_SHARED |
3002                           ZFCP_STATUS_UNIT_READONLY,
3003                           &unit->status);
3004
3005         /* evaluate FSF status in QTCB */
3006         switch (header->fsf_status) {
3007
3008         case FSF_PORT_HANDLE_NOT_VALID:
3009                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
3010                               "for port 0x%016Lx on adapter %s invalid "
3011                               "This may happen occasionally\n",
3012                               unit->port->handle,
3013                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3014                 ZFCP_LOG_DEBUG("status qualifier:\n");
3015                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3016                               (char *) &header->fsf_status_qual,
3017                               sizeof (union fsf_status_qual));
3018                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, fsf_req);
3019                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3020                 break;
3021
3022         case FSF_LUN_ALREADY_OPEN:
3023                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3024                                 "remote port 0x%016Lx on adapter %s twice.\n",
3025                                 unit->fcp_lun,
3026                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3027                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3028                 break;
3029
3030         case FSF_ACCESS_DENIED:
3031                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3032                                 "remote port 0x%016Lx on adapter %s\n",
3033                                 unit->fcp_lun, unit->port->wwpn,
3034                                 zfcp_get_busid_by_unit(unit));
3035                 for (counter = 0; counter < 2; counter++) {
3036                         subtable = header->fsf_status_qual.halfword[counter * 2];
3037                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3038                         switch (subtable) {
3039                         case FSF_SQ_CFDC_SUBTABLE_OS:
3040                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3041                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3042                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3043                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3044                                         zfcp_act_subtable_type[subtable], rule);
3045                                 break;
3046                         }
3047                 }
3048                 zfcp_erp_unit_access_denied(unit, 59, fsf_req);
3049                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3050                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3051                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3052                 break;
3053
3054         case FSF_PORT_BOXED:
3055                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3056                                "needs to be reopened\n",
3057                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3058                 zfcp_erp_port_boxed(unit->port, 51, fsf_req);
3059                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3060                         ZFCP_STATUS_FSFREQ_RETRY;
3061                 break;
3062
3063         case FSF_LUN_SHARING_VIOLATION:
3064                 if (header->fsf_status_qual.word[0] != 0) {
3065                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3066                                         "with WWPN 0x%Lx "
3067                                         "connected to the adapter %s "
3068                                         "is already in use in LPAR%d, CSS%d\n",
3069                                         unit->fcp_lun,
3070                                         unit->port->wwpn,
3071                                         zfcp_get_busid_by_unit(unit),
3072                                         queue_designator->hla,
3073                                         queue_designator->cssid);
3074                 } else {
3075                         subtable = header->fsf_status_qual.halfword[4];
3076                         rule = header->fsf_status_qual.halfword[5];
3077                         switch (subtable) {
3078                         case FSF_SQ_CFDC_SUBTABLE_OS:
3079                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3080                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3081                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3082                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3083                                                 "remote port with WWPN 0x%Lx "
3084                                                 "connected to the adapter %s "
3085                                                 "is denied (%s rule %d)\n",
3086                                                 unit->fcp_lun,
3087                                                 unit->port->wwpn,
3088                                                 zfcp_get_busid_by_unit(unit),
3089                                                 zfcp_act_subtable_type[subtable],
3090                                                 rule);
3091                                 break;
3092                         }
3093                 }
3094                 ZFCP_LOG_DEBUG("status qualifier:\n");
3095                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3096                               (char *) &header->fsf_status_qual,
3097                               sizeof (union fsf_status_qual));
3098                 zfcp_erp_unit_access_denied(unit, 60, fsf_req);
3099                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3100                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3101                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3102                 break;
3103
3104         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3105                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3106                               "There is no handle (temporary port identifier) "
3107                               "available for unit 0x%016Lx on port 0x%016Lx "
3108                               "on adapter %s\n",
3109                               unit->fcp_lun,
3110                               unit->port->wwpn,
3111                               zfcp_get_busid_by_unit(unit));
3112                 zfcp_erp_unit_failed(unit, 34, fsf_req);
3113                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3114                 break;
3115
3116         case FSF_ADAPTER_STATUS_AVAILABLE:
3117                 switch (header->fsf_status_qual.word[0]) {
3118                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3119                         /* Re-establish link to port */
3120                         zfcp_test_link(unit->port);
3121                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3122                         break;
3123                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3124                         /* ERP strategy will escalate */
3125                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3126                         break;
3127                 default:
3128                         ZFCP_LOG_NORMAL
3129                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3130                              header->fsf_status_qual.word[0]);
3131                 }
3132                 break;
3133
3134         case FSF_INVALID_COMMAND_OPTION:
3135                 ZFCP_LOG_NORMAL(
3136                         "Invalid option 0x%x has been specified "
3137                         "in QTCB bottom sent to the adapter %s\n",
3138                         bottom->option,
3139                         zfcp_get_busid_by_adapter(adapter));
3140                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3141                 retval = -EINVAL;
3142                 break;
3143
3144         case FSF_GOOD:
3145                 /* save LUN handle assigned by FSF */
3146                 unit->handle = header->lun_handle;
3147                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3148                                "adapter %s opened, port handle 0x%x\n",
3149                                unit->fcp_lun,
3150                                unit->port->wwpn,
3151                                zfcp_get_busid_by_unit(unit),
3152                                unit->handle);
3153                 /* mark unit as open */
3154                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3155
3156                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
3157                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
3158                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
3159                         exclusive = (bottom->lun_access_info &
3160                                         FSF_UNIT_ACCESS_EXCLUSIVE);
3161                         readwrite = (bottom->lun_access_info &
3162                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
3163
3164                         if (!exclusive)
3165                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3166                                                 &unit->status);
3167
3168                         if (!readwrite) {
3169                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3170                                                 &unit->status);
3171                                 ZFCP_LOG_NORMAL("read-only access for unit "
3172                                                 "(adapter %s, wwpn=0x%016Lx, "
3173                                                 "fcp_lun=0x%016Lx)\n",
3174                                                 zfcp_get_busid_by_unit(unit),
3175                                                 unit->port->wwpn,
3176                                                 unit->fcp_lun);
3177                         }
3178
3179                         if (exclusive && !readwrite) {
3180                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3181                                                 "unit not supported\n");
3182                                 zfcp_erp_unit_failed(unit, 35, fsf_req);
3183                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3184                                 zfcp_erp_unit_shutdown(unit, 0, 80, fsf_req);
3185                         } else if (!exclusive && readwrite) {
3186                                 ZFCP_LOG_NORMAL("shared access of read-write "
3187                                                 "unit not supported\n");
3188                                 zfcp_erp_unit_failed(unit, 36, fsf_req);
3189                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3190                                 zfcp_erp_unit_shutdown(unit, 0, 81, fsf_req);
3191                         }
3192                 }
3193
3194                 retval = 0;
3195                 break;
3196
3197         default:
3198                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3199                                 "(debug info 0x%x)\n",
3200                                 header->fsf_status);
3201                 break;
3202         }
3203
3204  skip_fsfstatus:
3205         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3206         return retval;
3207 }
3208
3209 /*
3210  * function:    zfcp_fsf_close_unit
3211  *
3212  * purpose:
3213  *
3214  * returns:     address of fsf_req - request successfully initiated
3215  *              NULL -
3216  *
3217  * assumptions: This routine does not check whether the associated
3218  *              remote port/lun has already been opened. This should be
3219  *              done by calling routines. Otherwise some status
3220  *              may be presented by FSF
3221  */
3222 int
3223 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3224 {
3225         volatile struct qdio_buffer_element *sbale;
3226         struct zfcp_fsf_req *fsf_req;
3227         unsigned long lock_flags;
3228         int retval = 0;
3229
3230         /* setup new FSF request */
3231         retval = zfcp_fsf_req_create(erp_action->adapter,
3232                                      FSF_QTCB_CLOSE_LUN,
3233                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3234                                      erp_action->adapter->pool.fsf_req_erp,
3235                                      &lock_flags, &fsf_req);
3236         if (retval < 0) {
3237                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3238                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3239                               erp_action->unit->fcp_lun,
3240                               erp_action->port->wwpn,
3241                               zfcp_get_busid_by_adapter(erp_action->adapter));
3242                 goto out;
3243         }
3244
3245         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3246         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3247         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3248
3249         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
3250         fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3251         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3252         fsf_req->data = (unsigned long) erp_action->unit;
3253         fsf_req->erp_action = erp_action;
3254         erp_action->fsf_req = fsf_req;
3255
3256         zfcp_erp_start_timer(fsf_req);
3257         retval = zfcp_fsf_req_send(erp_action->fsf_req);
3258         if (retval) {
3259                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3260                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3261                               erp_action->unit->fcp_lun,
3262                               erp_action->port->wwpn,
3263                               zfcp_get_busid_by_adapter(erp_action->adapter));
3264                 zfcp_fsf_req_free(fsf_req);
3265                 erp_action->fsf_req = NULL;
3266                 goto out;
3267         }
3268
3269         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3270                        "port 0x%016Lx, unit 0x%016Lx)\n",
3271                        zfcp_get_busid_by_adapter(erp_action->adapter),
3272                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3273  out:
3274         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3275                                 lock_flags);
3276         return retval;
3277 }
3278
3279 /*
3280  * function:    zfcp_fsf_close_unit_handler
3281  *
3282  * purpose:     is called for finished Close LUN FSF command
3283  *
3284  * returns:
3285  */
3286 static int
3287 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3288 {
3289         int retval = -EINVAL;
3290         struct zfcp_unit *unit;
3291
3292         unit = (struct zfcp_unit *) fsf_req->data;
3293
3294         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3295                 /* don't change unit status in our bookkeeping */
3296                 goto skip_fsfstatus;
3297         }
3298
3299         /* evaluate FSF status in QTCB */
3300         switch (fsf_req->qtcb->header.fsf_status) {
3301
3302         case FSF_PORT_HANDLE_NOT_VALID:
3303                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3304                               "0x%016Lx on adapter %s invalid. This may "
3305                               "happen in rare circumstances\n",
3306                               unit->port->handle,
3307                               unit->port->wwpn,
3308                               zfcp_get_busid_by_unit(unit));
3309                 ZFCP_LOG_DEBUG("status qualifier:\n");
3310                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3311                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3312                               sizeof (union fsf_status_qual));
3313                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, fsf_req);
3314                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3315                 break;
3316
3317         case FSF_LUN_HANDLE_NOT_VALID:
3318                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3319                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3320                               "invalid. This may happen occasionally.\n",
3321                               unit->handle,
3322                               unit->fcp_lun,
3323                               unit->port->wwpn,
3324                               zfcp_get_busid_by_unit(unit));
3325                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3326                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3327                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3328                               sizeof (union fsf_status_qual));
3329                 zfcp_erp_port_reopen(unit->port, 0, 111, fsf_req);
3330                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3331                 break;
3332
3333         case FSF_PORT_BOXED:
3334                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3335                                "needs to be reopened\n",
3336                                unit->port->wwpn,
3337                                zfcp_get_busid_by_unit(unit));
3338                 zfcp_erp_port_boxed(unit->port, 52, fsf_req);
3339                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3340                         ZFCP_STATUS_FSFREQ_RETRY;
3341                 break;
3342
3343         case FSF_ADAPTER_STATUS_AVAILABLE:
3344                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3345                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3346                         /* re-establish link to port */
3347                         zfcp_test_link(unit->port);
3348                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3349                         break;
3350                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3351                         /* ERP strategy will escalate */
3352                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3353                         break;
3354                 default:
3355                         ZFCP_LOG_NORMAL
3356                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3357                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3358                         break;
3359                 }
3360                 break;
3361
3362         case FSF_GOOD:
3363                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3364                                "closed, port handle 0x%x\n",
3365                                unit->fcp_lun,
3366                                unit->port->wwpn,
3367                                zfcp_get_busid_by_unit(unit),
3368                                unit->handle);
3369                 /* mark unit as closed */
3370                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3371                 retval = 0;
3372                 break;
3373
3374         default:
3375                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3376                                 "(debug info 0x%x)\n",
3377                                 fsf_req->qtcb->header.fsf_status);
3378                 break;
3379         }
3380
3381  skip_fsfstatus:
3382         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3383         return retval;
3384 }
3385
3386 /**
3387  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3388  * @adapter: adapter where scsi command is issued
3389  * @unit: unit where command is sent to
3390  * @scsi_cmnd: scsi command to be sent
3391  * @timer: timer to be started when request is initiated
3392  * @req_flags: flags for fsf_request
3393  */
3394 int
3395 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3396                                struct zfcp_unit *unit,
3397                                struct scsi_cmnd * scsi_cmnd,
3398                                int use_timer, int req_flags)
3399 {
3400         struct zfcp_fsf_req *fsf_req = NULL;
3401         struct fcp_cmnd_iu *fcp_cmnd_iu;
3402         unsigned int sbtype;
3403         unsigned long lock_flags;
3404         int real_bytes = 0;
3405         int retval = 0;
3406         int mask;
3407
3408         /* setup new FSF request */
3409         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3410                                      adapter->pool.fsf_req_scsi,
3411                                      &lock_flags, &fsf_req);
3412         if (unlikely(retval < 0)) {
3413                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3414                                "for unit 0x%016Lx on port 0x%016Lx on "
3415                                "adapter %s\n",
3416                                unit->fcp_lun,
3417                                unit->port->wwpn,
3418                                zfcp_get_busid_by_adapter(adapter));
3419                 goto failed_req_create;
3420         }
3421
3422         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3423                         &unit->status))) {
3424                 retval = -EBUSY;
3425                 goto unit_blocked;
3426         }
3427
3428         zfcp_unit_get(unit);
3429         fsf_req->unit = unit;
3430
3431         /* associate FSF request with SCSI request (for look up on abort) */
3432         scsi_cmnd->host_scribble = (unsigned char *) fsf_req->req_id;
3433
3434         /* associate SCSI command with FSF request */
3435         fsf_req->data = (unsigned long) scsi_cmnd;
3436
3437         /* set handles of unit and its parent port in QTCB */
3438         fsf_req->qtcb->header.lun_handle = unit->handle;
3439         fsf_req->qtcb->header.port_handle = unit->port->handle;
3440
3441         /* FSF does not define the structure of the FCP_CMND IU */
3442         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3443             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3444
3445         /*
3446          * set depending on data direction:
3447          *      data direction bits in SBALE (SB Type)
3448          *      data direction bits in QTCB
3449          *      data direction bits in FCP_CMND IU
3450          */
3451         switch (scsi_cmnd->sc_data_direction) {
3452         case DMA_NONE:
3453                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3454                 /*
3455                  * FIXME(qdio):
3456                  * what is the correct type for commands
3457                  * without 'real' data buffers?
3458                  */
3459                 sbtype = SBAL_FLAGS0_TYPE_READ;
3460                 break;
3461         case DMA_FROM_DEVICE:
3462                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3463                 sbtype = SBAL_FLAGS0_TYPE_READ;
3464                 fcp_cmnd_iu->rddata = 1;
3465                 break;
3466         case DMA_TO_DEVICE:
3467                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3468                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3469                 fcp_cmnd_iu->wddata = 1;
3470                 break;
3471         case DMA_BIDIRECTIONAL:
3472         default:
3473                 /*
3474                  * dummy, catch this condition earlier
3475                  * in zfcp_scsi_queuecommand
3476                  */
3477                 goto failed_scsi_cmnd;
3478         }
3479
3480         /* set FC service class in QTCB (3 per default) */
3481         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3482
3483         /* set FCP_LUN in FCP_CMND IU in QTCB */
3484         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3485
3486         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3487
3488         /* set task attributes in FCP_CMND IU in QTCB */
3489         if (likely((scsi_cmnd->device->simple_tags) ||
3490                    (atomic_test_mask(mask, &unit->status))))
3491                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3492         else
3493                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3494
3495         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3496         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3497                 fcp_cmnd_iu->add_fcp_cdb_length
3498                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3499                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3500                                "additional FCP_CDB length is 0x%x "
3501                                "(shifted right 2 bits)\n",
3502                                scsi_cmnd->cmd_len,
3503                                fcp_cmnd_iu->add_fcp_cdb_length);
3504         }
3505         /*
3506          * copy SCSI CDB (including additional length, if any) to
3507          * FCP_CDB in FCP_CMND IU in QTCB
3508          */
3509         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3510
3511         /* FCP CMND IU length in QTCB */
3512         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3513                 sizeof (struct fcp_cmnd_iu) +
3514                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3515
3516         /* generate SBALEs from data buffer */
3517         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3518         if (unlikely(real_bytes < 0)) {
3519                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3520                         ZFCP_LOG_DEBUG(
3521                                 "Data did not fit into available buffer(s), "
3522                                "waiting for more...\n");
3523                         retval = -EIO;
3524                 } else {
3525                         ZFCP_LOG_NORMAL("error: No truncation implemented but "
3526                                         "required. Shutting down unit "
3527                                         "(adapter %s, port 0x%016Lx, "
3528                                         "unit 0x%016Lx)\n",
3529                                         zfcp_get_busid_by_unit(unit),
3530                                         unit->port->wwpn,
3531                                         unit->fcp_lun);
3532                         zfcp_erp_unit_shutdown(unit, 0, 131, fsf_req);
3533                         retval = -EINVAL;
3534                 }
3535                 goto no_fit;
3536         }
3537
3538         /* set length of FCP data length in FCP_CMND IU in QTCB */
3539         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3540
3541         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3542         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3543                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3544
3545         if (use_timer)
3546                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
3547
3548         retval = zfcp_fsf_req_send(fsf_req);
3549         if (unlikely(retval < 0)) {
3550                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3551                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3552                               zfcp_get_busid_by_adapter(adapter),
3553                               unit->port->wwpn,
3554                               unit->fcp_lun);
3555                 goto send_failed;
3556         }
3557
3558         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3559                        "port 0x%016Lx, unit 0x%016Lx)\n",
3560                        zfcp_get_busid_by_adapter(adapter),
3561                        unit->port->wwpn,
3562                        unit->fcp_lun);
3563         goto success;
3564
3565  send_failed:
3566  no_fit:
3567  failed_scsi_cmnd:
3568         zfcp_unit_put(unit);
3569  unit_blocked:
3570         zfcp_fsf_req_free(fsf_req);
3571         fsf_req = NULL;
3572         scsi_cmnd->host_scribble = NULL;
3573  success:
3574  failed_req_create:
3575         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3576         return retval;
3577 }
3578
3579 struct zfcp_fsf_req *
3580 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3581                                           struct zfcp_unit *unit,
3582                                           u8 tm_flags, int req_flags)
3583 {
3584         struct zfcp_fsf_req *fsf_req = NULL;
3585         int retval = 0;
3586         struct fcp_cmnd_iu *fcp_cmnd_iu;
3587         unsigned long lock_flags;
3588         volatile struct qdio_buffer_element *sbale;
3589
3590         /* setup new FSF request */
3591         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3592                                      adapter->pool.fsf_req_scsi,
3593                                      &lock_flags, &fsf_req);
3594         if (retval < 0) {
3595                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3596                               "management) request for adapter %s, port "
3597                               " 0x%016Lx, unit 0x%016Lx.\n",
3598                               zfcp_get_busid_by_adapter(adapter),
3599                               unit->port->wwpn, unit->fcp_lun);
3600                 goto out;
3601         }
3602
3603         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3604                         &unit->status)))
3605                 goto unit_blocked;
3606
3607         /*
3608          * Used to decide on proper handler in the return path,
3609          * could be either zfcp_fsf_send_fcp_command_task_handler or
3610          * zfcp_fsf_send_fcp_command_task_management_handler */
3611
3612         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3613
3614         /*
3615          * hold a pointer to the unit being target of this
3616          * task management request
3617          */
3618         fsf_req->data = (unsigned long) unit;
3619
3620         /* set FSF related fields in QTCB */
3621         fsf_req->qtcb->header.lun_handle = unit->handle;
3622         fsf_req->qtcb->header.port_handle = unit->port->handle;
3623         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3624         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3625         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3626                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3627
3628         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3629         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3630         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3631
3632         /* set FCP related fields in FCP_CMND IU in QTCB */
3633         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3634                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3635         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3636         fcp_cmnd_iu->task_management_flags = tm_flags;
3637
3638         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
3639         retval = zfcp_fsf_req_send(fsf_req);
3640         if (!retval)
3641                 goto out;
3642
3643  unit_blocked:
3644         zfcp_fsf_req_free(fsf_req);
3645         fsf_req = NULL;
3646
3647  out:
3648         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3649         return fsf_req;
3650 }
3651
3652 /*
3653  * function:    zfcp_fsf_send_fcp_command_handler
3654  *
3655  * purpose:     is called for finished Send FCP Command
3656  *
3657  * returns:
3658  */
3659 static int
3660 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3661 {
3662         int retval = -EINVAL;
3663         struct zfcp_unit *unit;
3664         struct fsf_qtcb_header *header;
3665         u16 subtable, rule, counter;
3666
3667         header = &fsf_req->qtcb->header;
3668
3669         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3670                 unit = (struct zfcp_unit *) fsf_req->data;
3671         else
3672                 unit = fsf_req->unit;
3673
3674         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3675                 /* go directly to calls of special handlers */
3676                 goto skip_fsfstatus;
3677         }
3678
3679         /* evaluate FSF status in QTCB */
3680         switch (header->fsf_status) {
3681
3682         case FSF_PORT_HANDLE_NOT_VALID:
3683                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3684                               "0x%016Lx on adapter %s invalid\n",
3685                               unit->port->handle,
3686                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3687                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3688                               (char *) &header->fsf_status_qual,
3689                               sizeof (union fsf_status_qual));
3690                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, fsf_req);
3691                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3692                 break;
3693
3694         case FSF_LUN_HANDLE_NOT_VALID:
3695                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3696                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3697                               "invalid. This may happen occasionally.\n",
3698                               unit->handle,
3699                               unit->fcp_lun,
3700                               unit->port->wwpn,
3701                               zfcp_get_busid_by_unit(unit));
3702                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3703                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3704                               (char *) &header->fsf_status_qual,
3705                               sizeof (union fsf_status_qual));
3706                 zfcp_erp_port_reopen(unit->port, 0, 113, fsf_req);
3707                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3708                 break;
3709
3710         case FSF_HANDLE_MISMATCH:
3711                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3712                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3713                                 "unit 0x%016Lx)\n",
3714                                 unit->port->handle,
3715                                 zfcp_get_busid_by_unit(unit),
3716                                 unit->port->wwpn,
3717                                 unit->fcp_lun);
3718                 ZFCP_LOG_NORMAL("status qualifier:\n");
3719                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3720                               (char *) &header->fsf_status_qual,
3721                               sizeof (union fsf_status_qual));
3722                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 114, fsf_req);
3723                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3724                 break;
3725
3726         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3727                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
3728                               "class %d.\n",
3729                               zfcp_get_busid_by_unit(unit),
3730                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
3731                 /* stop operation for this adapter */
3732                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 132, fsf_req);
3733                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3734                 break;
3735
3736         case FSF_FCPLUN_NOT_VALID:
3737                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3738                                 "adapter %s does not have correct unit "
3739                                 "handle 0x%x\n",
3740                                 unit->fcp_lun,
3741                                 unit->port->wwpn,
3742                                 zfcp_get_busid_by_unit(unit),
3743                                 unit->handle);
3744                 ZFCP_LOG_DEBUG("status qualifier:\n");
3745                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3746                               (char *) &header->fsf_status_qual,
3747                               sizeof (union fsf_status_qual));
3748                 zfcp_erp_port_reopen(unit->port, 0, 115, fsf_req);
3749                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3750                 break;
3751
3752         case FSF_ACCESS_DENIED:
3753                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3754                                 "unit 0x%016Lx on port 0x%016Lx on "
3755                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3756                                 zfcp_get_busid_by_unit(unit));
3757                 for (counter = 0; counter < 2; counter++) {
3758                         subtable = header->fsf_status_qual.halfword[counter * 2];
3759                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3760                         switch (subtable) {
3761                         case FSF_SQ_CFDC_SUBTABLE_OS:
3762                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3763                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3764                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3765                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3766                                         zfcp_act_subtable_type[subtable], rule);
3767                                 break;
3768                         }
3769                 }
3770                 zfcp_erp_unit_access_denied(unit, 61, fsf_req);
3771                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3772                 break;
3773
3774         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3775                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3776                               "0x%016Lx on port 0x%016Lx on adapter %s "
3777                               "(debug info %d)\n",
3778                               unit->fcp_lun,
3779                               unit->port->wwpn,
3780                               zfcp_get_busid_by_unit(unit),
3781                               fsf_req->qtcb->bottom.io.data_direction);
3782                 /* stop operation for this adapter */
3783                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, fsf_req);
3784                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3785                 break;
3786
3787         case FSF_CMND_LENGTH_NOT_VALID:
3788                 ZFCP_LOG_NORMAL
3789                     ("bug: An invalid control-data-block length field "
3790                      "was found in a command for unit 0x%016Lx on port "
3791                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3792                      unit->fcp_lun, unit->port->wwpn,
3793                      zfcp_get_busid_by_unit(unit),
3794                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3795                 /* stop operation for this adapter */
3796                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, fsf_req);
3797                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3798                 break;
3799
3800         case FSF_PORT_BOXED:
3801                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3802                                "needs to be reopened\n",
3803                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3804                 zfcp_erp_port_boxed(unit->port, 53, fsf_req);
3805                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3806                         ZFCP_STATUS_FSFREQ_RETRY;
3807                 break;
3808
3809         case FSF_LUN_BOXED:
3810                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3811                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3812                                 zfcp_get_busid_by_unit(unit),
3813                                 unit->port->wwpn, unit->fcp_lun);
3814                 zfcp_erp_unit_boxed(unit, 54, fsf_req);
3815                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3816                         | ZFCP_STATUS_FSFREQ_RETRY;
3817                 break;
3818
3819         case FSF_ADAPTER_STATUS_AVAILABLE:
3820                 switch (header->fsf_status_qual.word[0]) {
3821                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3822                         /* re-establish link to port */
3823                         zfcp_test_link(unit->port);
3824                         break;
3825                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3826                         /* FIXME(hw) need proper specs for proper action */
3827                         /* let scsi stack deal with retries and escalation */
3828                         break;
3829                 default:
3830                         ZFCP_LOG_NORMAL
3831                             ("Unknown status qualifier 0x%x arrived.\n",
3832                              header->fsf_status_qual.word[0]);
3833                         break;
3834                 }
3835                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3836                 break;
3837
3838         case FSF_GOOD:
3839                 break;
3840
3841         case FSF_FCP_RSP_AVAILABLE:
3842                 break;
3843         }
3844
3845  skip_fsfstatus:
3846         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3847                 retval =
3848                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3849         } else {
3850                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3851                 fsf_req->unit = NULL;
3852                 zfcp_unit_put(unit);
3853         }
3854         return retval;
3855 }
3856
3857 /*
3858  * function:    zfcp_fsf_send_fcp_command_task_handler
3859  *
3860  * purpose:     evaluates FCP_RSP IU
3861  *
3862  * returns:
3863  */
3864 static int
3865 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3866 {
3867         int retval = 0;
3868         struct scsi_cmnd *scpnt;
3869         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3870             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3871         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3872             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3873         u32 sns_len;
3874         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3875         unsigned long flags;
3876         struct zfcp_unit *unit = fsf_req->unit;
3877
3878         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3879         scpnt = (struct scsi_cmnd *) fsf_req->data;
3880         if (unlikely(!scpnt)) {
3881                 ZFCP_LOG_DEBUG
3882                     ("Command with fsf_req %p is not associated to "
3883                      "a scsi command anymore. Aborted?\n", fsf_req);
3884                 goto out;
3885         }
3886         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3887                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3888                  *        DID_SOFT_ERROR by retrying the request for devices
3889                  *        that allow retries.
3890                  */
3891                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3892                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3893                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3894                 goto skip_fsfstatus;
3895         }
3896
3897         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3898                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3899                 set_host_byte(&scpnt->result, DID_ERROR);
3900                 goto skip_fsfstatus;
3901         }
3902
3903         /* set message byte of result in SCSI command */
3904         scpnt->result |= COMMAND_COMPLETE << 8;
3905
3906         /*
3907          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
3908          * of result in SCSI command
3909          */
3910         scpnt->result |= fcp_rsp_iu->scsi_status;
3911         if (unlikely(fcp_rsp_iu->scsi_status)) {
3912                 /* DEBUG */
3913                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
3914                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3915                               scpnt->cmnd, scpnt->cmd_len);
3916                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
3917                                 fcp_rsp_iu->scsi_status);
3918                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3919                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
3920                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3921                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
3922                               fcp_rsp_iu->fcp_sns_len);
3923         }
3924
3925         /* check FCP_RSP_INFO */
3926         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
3927                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
3928                 switch (fcp_rsp_info[3]) {
3929                 case RSP_CODE_GOOD:
3930                         /* ok, continue */
3931                         ZFCP_LOG_TRACE("no failure or Task Management "
3932                                        "Function complete\n");
3933                         set_host_byte(&scpnt->result, DID_OK);
3934                         break;
3935                 case RSP_CODE_LENGTH_MISMATCH:
3936                         /* hardware bug */
3937                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3938                                         "that the fibrechannel protocol data "
3939                                         "length differs from the burst length. "
3940                                         "The problem occured on unit 0x%016Lx "
3941                                         "on port 0x%016Lx on adapter %s",
3942                                         unit->fcp_lun,
3943                                         unit->port->wwpn,
3944                                         zfcp_get_busid_by_unit(unit));
3945                         /* dump SCSI CDB as prepared by zfcp */
3946                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3947                                       (char *) &fsf_req->qtcb->
3948                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3949                         set_host_byte(&scpnt->result, DID_ERROR);
3950                         goto skip_fsfstatus;
3951                 case RSP_CODE_FIELD_INVALID:
3952                         /* driver or hardware bug */
3953                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3954                                         "that the fibrechannel protocol data "
3955                                         "fields were incorrectly set up. "
3956                                         "The problem occured on the unit "
3957                                         "0x%016Lx on port 0x%016Lx on "
3958                                         "adapter %s",
3959                                         unit->fcp_lun,
3960                                         unit->port->wwpn,
3961                                         zfcp_get_busid_by_unit(unit));
3962                         /* dump SCSI CDB as prepared by zfcp */
3963                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3964                                       (char *) &fsf_req->qtcb->
3965                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3966                         set_host_byte(&scpnt->result, DID_ERROR);
3967                         goto skip_fsfstatus;
3968                 case RSP_CODE_RO_MISMATCH:
3969                         /* hardware bug */
3970                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
3971                                         "that conflicting  values for the "
3972                                         "fibrechannel payload offset from the "
3973                                         "header were found. "
3974                                         "The problem occured on unit 0x%016Lx "
3975                                         "on port 0x%016Lx on adapter %s.\n",
3976                                         unit->fcp_lun,
3977                                         unit->port->wwpn,
3978                                         zfcp_get_busid_by_unit(unit));
3979                         /* dump SCSI CDB as prepared by zfcp */
3980                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3981                                       (char *) &fsf_req->qtcb->
3982                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3983                         set_host_byte(&scpnt->result, DID_ERROR);
3984                         goto skip_fsfstatus;
3985                 default:
3986                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
3987                                         "code was detected for a command. "
3988                                         "The problem occured on the unit "
3989                                         "0x%016Lx on port 0x%016Lx on "
3990                                         "adapter %s (debug info 0x%x)\n",
3991                                         unit->fcp_lun,
3992                                         unit->port->wwpn,
3993                                         zfcp_get_busid_by_unit(unit),
3994                                         fcp_rsp_info[3]);
3995                         /* dump SCSI CDB as prepared by zfcp */
3996                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3997                                       (char *) &fsf_req->qtcb->
3998                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3999                         set_host_byte(&scpnt->result, DID_ERROR);
4000                         goto skip_fsfstatus;
4001                 }
4002         }
4003
4004         /* check for sense data */
4005         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4006                 sns_len = FSF_FCP_RSP_SIZE -
4007                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4008                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4009                                sns_len);
4010                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4011                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4012                                SCSI_SENSE_BUFFERSIZE);
4013                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4014                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4015                                scpnt->result);
4016                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4017                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4018
4019                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4020                                fcp_rsp_iu->fcp_sns_len);
4021                 memcpy(scpnt->sense_buffer,
4022                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4023                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4024                               (void *)scpnt->sense_buffer, sns_len);
4025         }
4026
4027         /* check for overrun */
4028         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4029                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4030                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4031                               "The response data length is "
4032                               "%d, the original length was %d.\n",
4033                               unit->fcp_lun,
4034                               unit->port->wwpn,
4035                               zfcp_get_busid_by_unit(unit),
4036                               fcp_rsp_iu->fcp_resid,
4037                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4038         }
4039
4040         /* check for underrun */
4041         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4042                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4043                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4044                               "The response data length is "
4045                               "%d, the original length was %d.\n",
4046                               unit->fcp_lun,
4047                               unit->port->wwpn,
4048                               zfcp_get_busid_by_unit(unit),
4049                               fcp_rsp_iu->fcp_resid,
4050                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4051
4052                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
4053                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
4054                     scpnt->underflow)
4055                         set_host_byte(&scpnt->result, DID_ERROR);
4056         }
4057
4058  skip_fsfstatus:
4059         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4060
4061         if (scpnt->result != 0)
4062                 zfcp_scsi_dbf_event_result("erro", 3, fsf_req->adapter, scpnt, fsf_req);
4063         else if (scpnt->retries > 0)
4064                 zfcp_scsi_dbf_event_result("retr", 4, fsf_req->adapter, scpnt, fsf_req);
4065         else
4066                 zfcp_scsi_dbf_event_result("norm", 6, fsf_req->adapter, scpnt, fsf_req);
4067
4068         /* cleanup pointer (need this especially for abort) */
4069         scpnt->host_scribble = NULL;
4070
4071         /* always call back */
4072         (scpnt->scsi_done) (scpnt);
4073
4074         /*
4075          * We must hold this lock until scsi_done has been called.
4076          * Otherwise we may call scsi_done after abort regarding this
4077          * command has completed.
4078          * Note: scsi_done must not block!
4079          */
4080  out:
4081         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4082         return retval;
4083 }
4084
4085 /*
4086  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4087  *
4088  * purpose:     evaluates FCP_RSP IU
4089  *
4090  * returns:
4091  */
4092 static int
4093 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4094 {
4095         int retval = 0;
4096         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4097             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4098         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4099         struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
4100
4101         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4102                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4103                 goto skip_fsfstatus;
4104         }
4105
4106         /* check FCP_RSP_INFO */
4107         switch (fcp_rsp_info[3]) {
4108         case RSP_CODE_GOOD:
4109                 /* ok, continue */
4110                 ZFCP_LOG_DEBUG("no failure or Task Management "
4111                                "Function complete\n");
4112                 break;
4113         case RSP_CODE_TASKMAN_UNSUPP:
4114                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4115                                 "is not supported on the target device "
4116                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4117                                 unit->fcp_lun,
4118                                 unit->port->wwpn,
4119                                 zfcp_get_busid_by_unit(unit));
4120                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4121                 break;
4122         case RSP_CODE_TASKMAN_FAILED:
4123                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4124                                 "failed to complete successfully. "
4125                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4126                                 unit->fcp_lun,
4127                                 unit->port->wwpn,
4128                                 zfcp_get_busid_by_unit(unit));
4129                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4130                 break;
4131         default:
4132                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4133                                 "code was detected for a command. "
4134                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4135                                 "(debug info 0x%x)\n",
4136                                 unit->fcp_lun,
4137                                 unit->port->wwpn,
4138                                 zfcp_get_busid_by_unit(unit),
4139                                 fcp_rsp_info[3]);
4140                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4141         }
4142
4143       skip_fsfstatus:
4144         return retval;
4145 }
4146
4147
4148 /*
4149  * function:    zfcp_fsf_control_file
4150  *
4151  * purpose:     Initiator of the control file upload/download FSF requests
4152  *
4153  * returns:     0           - FSF request is successfuly created and queued
4154  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4155  *              -EINVAL     - Invalid direction specified
4156  *              -ENOMEM     - Insufficient memory
4157  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4158  */
4159 int
4160 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4161                       struct zfcp_fsf_req **fsf_req_ptr,
4162                       u32 fsf_command,
4163                       u32 option,
4164                       struct zfcp_sg_list *sg_list)
4165 {
4166         struct zfcp_fsf_req *fsf_req;
4167         struct fsf_qtcb_bottom_support *bottom;
4168         volatile struct qdio_buffer_element *sbale;
4169         unsigned long lock_flags;
4170         int req_flags = 0;
4171         int direction;
4172         int retval = 0;
4173
4174         if (!(adapter->adapter_features & FSF_FEATURE_CFDC)) {
4175                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4176                               zfcp_get_busid_by_adapter(adapter));
4177                 retval = -EOPNOTSUPP;
4178                 goto out;
4179         }
4180
4181         switch (fsf_command) {
4182
4183         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4184                 direction = SBAL_FLAGS0_TYPE_WRITE;
4185                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4186                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4187                         req_flags = ZFCP_WAIT_FOR_SBAL;
4188                 break;
4189
4190         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4191                 direction = SBAL_FLAGS0_TYPE_READ;
4192                 break;
4193
4194         default:
4195                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4196                 retval = -EINVAL;
4197                 goto out;
4198         }
4199
4200         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4201                                      NULL, &lock_flags, &fsf_req);
4202         if (retval < 0) {
4203                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4204                               "adapter %s\n",
4205                         zfcp_get_busid_by_adapter(adapter));
4206                 retval = -EPERM;
4207                 goto unlock_queue_lock;
4208         }
4209
4210         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4211         sbale[0].flags |= direction;
4212
4213         bottom = &fsf_req->qtcb->bottom.support;
4214         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4215         bottom->option = option;
4216
4217         if (sg_list->count > 0) {
4218                 int bytes;
4219
4220                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4221                                                 sg_list->sg, sg_list->count,
4222                                                 ZFCP_MAX_SBALS_PER_REQ);
4223                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4224                         ZFCP_LOG_INFO(
4225                                 "error: Could not create sufficient number of "
4226                                 "SBALS for an FSF request to the adapter %s\n",
4227                                 zfcp_get_busid_by_adapter(adapter));
4228                         retval = -ENOMEM;
4229                         goto free_fsf_req;
4230                 }
4231         } else
4232                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4233
4234         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
4235         retval = zfcp_fsf_req_send(fsf_req);
4236         if (retval < 0) {
4237                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4238                               "(adapter %s)\n",
4239                               zfcp_get_busid_by_adapter(adapter));
4240                 retval = -EPERM;
4241                 goto free_fsf_req;
4242         }
4243         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4244
4245         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4246                         "adapter %s\n",
4247                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4248                         "download" : "upload",
4249                         zfcp_get_busid_by_adapter(adapter));
4250
4251         wait_event(fsf_req->completion_wq,
4252                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4253
4254         *fsf_req_ptr = fsf_req;
4255         goto out;
4256
4257  free_fsf_req:
4258         zfcp_fsf_req_free(fsf_req);
4259  unlock_queue_lock:
4260         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4261  out:
4262         return retval;
4263 }
4264
4265
4266 /*
4267  * function:    zfcp_fsf_control_file_handler
4268  *
4269  * purpose:     Handler of the control file upload/download FSF requests
4270  *
4271  * returns:     0       - FSF request successfuly processed
4272  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4273  *              -EACCES - There is no permission to execute an operation
4274  *              -EPERM  - The control file is not in a right format
4275  *              -EIO    - There is a problem with the FCP adapter
4276  *              -EINVAL - Invalid operation
4277  *              -EFAULT - User space memory I/O operation fault
4278  */
4279 static int
4280 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4281 {
4282         struct zfcp_adapter *adapter = fsf_req->adapter;
4283         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4284         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4285         int retval = 0;
4286
4287         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4288                 retval = -EINVAL;
4289                 goto skip_fsfstatus;
4290         }
4291
4292         switch (header->fsf_status) {
4293
4294         case FSF_GOOD:
4295                 ZFCP_LOG_NORMAL(
4296                         "The FSF request has been successfully completed "
4297                         "on the adapter %s\n",
4298                         zfcp_get_busid_by_adapter(adapter));
4299                 break;
4300
4301         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4302                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4303                         switch (header->fsf_status_qual.word[0]) {
4304
4305                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4306                                 ZFCP_LOG_NORMAL(
4307                                         "CFDC on the adapter %s has being "
4308                                         "hardened on primary and secondary SE\n",
4309                                         zfcp_get_busid_by_adapter(adapter));
4310                                 break;
4311
4312                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4313                                 ZFCP_LOG_NORMAL(
4314                                         "CFDC of the adapter %s could not "
4315                                         "be saved on the SE\n",
4316                                         zfcp_get_busid_by_adapter(adapter));
4317                                 break;
4318
4319                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4320                                 ZFCP_LOG_NORMAL(
4321                                         "CFDC of the adapter %s could not "
4322                                         "be copied to the secondary SE\n",
4323                                         zfcp_get_busid_by_adapter(adapter));
4324                                 break;
4325
4326                         default:
4327                                 ZFCP_LOG_NORMAL(
4328                                         "CFDC could not be hardened "
4329                                         "on the adapter %s\n",
4330                                         zfcp_get_busid_by_adapter(adapter));
4331                         }
4332                 }
4333                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4334                 retval = -EAGAIN;
4335                 break;
4336
4337         case FSF_AUTHORIZATION_FAILURE:
4338                 ZFCP_LOG_NORMAL(
4339                         "Adapter %s does not accept privileged commands\n",
4340                         zfcp_get_busid_by_adapter(adapter));
4341                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4342                 retval = -EACCES;
4343                 break;
4344
4345         case FSF_CFDC_ERROR_DETECTED:
4346                 ZFCP_LOG_NORMAL(
4347                         "Error at position %d in the CFDC, "
4348                         "CFDC is discarded by the adapter %s\n",
4349                         header->fsf_status_qual.word[0],
4350                         zfcp_get_busid_by_adapter(adapter));
4351                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4352                 retval = -EPERM;
4353                 break;
4354
4355         case FSF_CONTROL_FILE_UPDATE_ERROR:
4356                 ZFCP_LOG_NORMAL(
4357                         "Adapter %s cannot harden the control file, "
4358                         "file is discarded\n",
4359                         zfcp_get_busid_by_adapter(adapter));
4360                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4361                 retval = -EIO;
4362                 break;
4363
4364         case FSF_CONTROL_FILE_TOO_LARGE:
4365                 ZFCP_LOG_NORMAL(
4366                         "Control file is too large, file is discarded "
4367                         "by the adapter %s\n",
4368                         zfcp_get_busid_by_adapter(adapter));
4369                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4370                 retval = -EIO;
4371                 break;
4372
4373         case FSF_ACCESS_CONFLICT_DETECTED:
4374                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4375                         ZFCP_LOG_NORMAL(
4376                                 "CFDC has been discarded by the adapter %s, "
4377                                 "because activation would impact "
4378                                 "%d active connection(s)\n",
4379                                 zfcp_get_busid_by_adapter(adapter),
4380                                 header->fsf_status_qual.word[0]);
4381                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4382                 retval = -EIO;
4383                 break;
4384
4385         case FSF_CONFLICTS_OVERRULED:
4386                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4387                         ZFCP_LOG_NORMAL(
4388                                 "CFDC has been activated on the adapter %s, "
4389                                 "but activation has impacted "
4390                                 "%d active connection(s)\n",
4391                                 zfcp_get_busid_by_adapter(adapter),
4392                                 header->fsf_status_qual.word[0]);
4393                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4394                 retval = -EIO;
4395                 break;
4396
4397         case FSF_UNKNOWN_OP_SUBTYPE:
4398                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4399                                 "op_subtype=0x%x)\n",
4400                                 zfcp_get_busid_by_adapter(adapter),
4401                                 bottom->operation_subtype);
4402                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4403                 retval = -EINVAL;
4404                 break;
4405
4406         case FSF_INVALID_COMMAND_OPTION:
4407                 ZFCP_LOG_NORMAL(
4408                         "Invalid option 0x%x has been specified "
4409                         "in QTCB bottom sent to the adapter %s\n",
4410                         bottom->option,
4411                         zfcp_get_busid_by_adapter(adapter));
4412                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4413                 retval = -EINVAL;
4414                 break;
4415
4416         default:
4417                 ZFCP_LOG_NORMAL(
4418                         "bug: An unknown/unexpected FSF status 0x%08x "
4419                         "was presented on the adapter %s\n",
4420                         header->fsf_status,
4421                         zfcp_get_busid_by_adapter(adapter));
4422                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4423                 retval = -EINVAL;
4424                 break;
4425         }
4426
4427 skip_fsfstatus:
4428         return retval;
4429 }
4430
4431 static inline int
4432 zfcp_fsf_req_sbal_check(unsigned long *flags,
4433                         struct zfcp_qdio_queue *queue, int needed)
4434 {
4435         write_lock_irqsave(&queue->queue_lock, *flags);
4436         if (likely(atomic_read(&queue->free_count) >= needed))
4437                 return 1;
4438         write_unlock_irqrestore(&queue->queue_lock, *flags);
4439         return 0;
4440 }
4441
4442 /*
4443  * set qtcb pointer in fsf_req and initialize QTCB
4444  */
4445 static void
4446 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
4447 {
4448         if (likely(fsf_req->qtcb != NULL)) {
4449                 fsf_req->qtcb->prefix.req_seq_no =
4450                         fsf_req->adapter->fsf_req_seq_no;
4451                 fsf_req->qtcb->prefix.req_id = fsf_req->req_id;
4452                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4453                 fsf_req->qtcb->prefix.qtcb_type =
4454                         fsf_qtcb_type[fsf_req->fsf_command];
4455                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4456                 fsf_req->qtcb->header.req_handle = fsf_req->req_id;
4457                 fsf_req->qtcb->header.fsf_command = fsf_req->fsf_command;
4458         }
4459 }
4460
4461 /**
4462  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4463  * @adapter: adapter for which request queue is examined
4464  * @req_flags: flags indicating whether to wait for needed SBAL or not
4465  * @lock_flags: lock_flags if queue_lock is taken
4466  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4467  * Locks: lock adapter->request_queue->queue_lock on success
4468  */
4469 static int
4470 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4471                       unsigned long *lock_flags)
4472 {
4473         long ret;
4474         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4475
4476         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4477                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4478                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4479                                                        ZFCP_SBAL_TIMEOUT);
4480                 if (ret < 0)
4481                         return ret;
4482                 if (!ret)
4483                         return -EIO;
4484         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4485                 return -EIO;
4486
4487         return 0;
4488 }
4489
4490 /*
4491  * function:    zfcp_fsf_req_create
4492  *
4493  * purpose:     create an FSF request at the specified adapter and
4494  *              setup common fields
4495  *
4496  * returns:     -ENOMEM if there was insufficient memory for a request
4497  *              -EIO if no qdio buffers could be allocate to the request
4498  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4499  *              0 in success
4500  *
4501  * note:        The created request is returned by reference.
4502  *
4503  * locks:       lock of concerned request queue must not be held,
4504  *              but is held on completion (write, irqsave)
4505  */
4506 int
4507 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4508                     mempool_t *pool, unsigned long *lock_flags,
4509                     struct zfcp_fsf_req **fsf_req_p)
4510 {
4511         volatile struct qdio_buffer_element *sbale;
4512         struct zfcp_fsf_req *fsf_req = NULL;
4513         int ret = 0;
4514         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4515
4516         /* allocate new FSF request */
4517         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4518         if (unlikely(NULL == fsf_req)) {
4519                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into "
4520                                "the outbound (send) queue.\n");
4521                 ret = -ENOMEM;
4522                 goto failed_fsf_req;
4523         }
4524
4525         fsf_req->adapter = adapter;
4526         fsf_req->fsf_command = fsf_cmd;
4527         INIT_LIST_HEAD(&fsf_req->list);
4528         init_timer(&fsf_req->timer);
4529
4530         /* initialize waitqueue which may be used to wait on
4531            this request completion */
4532         init_waitqueue_head(&fsf_req->completion_wq);
4533
4534         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4535         if (ret < 0)
4536                 goto failed_sbals;
4537
4538         /* this is serialized (we are holding req_queue-lock of adapter) */
4539         if (adapter->req_no == 0)
4540                 adapter->req_no++;
4541         fsf_req->req_id = adapter->req_no++;
4542
4543         zfcp_fsf_req_qtcb_init(fsf_req);
4544
4545         /*
4546          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4547          * if it is not set (see also *_open_qdio and *_close_qdio).
4548          */
4549
4550         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4551                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4552                 ret = -EIO;
4553                 goto failed_sbals;
4554         }
4555
4556         if (fsf_req->qtcb) {
4557                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4558                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4559         }
4560         fsf_req->sbal_number = 1;
4561         fsf_req->sbal_first = req_queue->free_index;
4562         fsf_req->sbal_curr = req_queue->free_index;
4563         fsf_req->sbale_curr = 1;
4564
4565         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4566                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4567         }
4568
4569         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4570
4571         /* setup common SBALE fields */
4572         sbale[0].addr = (void *) fsf_req->req_id;
4573         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4574         if (likely(fsf_req->qtcb != NULL)) {
4575                 sbale[1].addr = (void *) fsf_req->qtcb;
4576                 sbale[1].length = sizeof(struct fsf_qtcb);
4577         }
4578
4579         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4580                        fsf_req->sbal_number, fsf_req->sbal_first);
4581
4582         goto success;
4583
4584  failed_sbals:
4585 /* dequeue new FSF request previously enqueued */
4586         zfcp_fsf_req_free(fsf_req);
4587         fsf_req = NULL;
4588
4589  failed_fsf_req:
4590         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4591  success:
4592         *fsf_req_p = fsf_req;
4593         return ret;
4594 }
4595
4596 /*
4597  * function:    zfcp_fsf_req_send
4598  *
4599  * purpose:     start transfer of FSF request via QDIO
4600  *
4601  * returns:     0 - request transfer succesfully started
4602  *              !0 - start of request transfer failed
4603  */
4604 static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
4605 {
4606         struct zfcp_adapter *adapter;
4607         struct zfcp_qdio_queue *req_queue;
4608         volatile struct qdio_buffer_element *sbale;
4609         int inc_seq_no;
4610         int new_distance_from_int;
4611         int retval = 0;
4612
4613         adapter = fsf_req->adapter;
4614         req_queue = &adapter->request_queue,
4615
4616
4617         /* FIXME(debug): remove it later */
4618         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4619         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4620         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4621         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4622                       sbale[1].length);
4623
4624         /* put allocated FSF request into hash table */
4625         spin_lock(&adapter->req_list_lock);
4626         zfcp_reqlist_add(adapter, fsf_req);
4627         spin_unlock(&adapter->req_list_lock);
4628
4629         inc_seq_no = (fsf_req->qtcb != NULL);
4630
4631         ZFCP_LOG_TRACE("request queue of adapter %s: "
4632                        "next free SBAL is %i, %i free SBALs\n",
4633                        zfcp_get_busid_by_adapter(adapter),
4634                        req_queue->free_index,
4635                        atomic_read(&req_queue->free_count));
4636
4637         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4638                        "index_in_queue=%i, count=%i, buffers=%p\n",
4639                        zfcp_get_busid_by_adapter(adapter),
4640                        QDIO_FLAG_SYNC_OUTPUT,
4641                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4642                        &req_queue->buffer[fsf_req->sbal_first]);
4643
4644         /*
4645          * adjust the number of free SBALs in request queue as well as
4646          * position of first one
4647          */
4648         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4649         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4650         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4651         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4652         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4653
4654         fsf_req->issued = get_clock();
4655
4656         retval = do_QDIO(adapter->ccw_device,
4657                          QDIO_FLAG_SYNC_OUTPUT,
4658                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4659
4660         if (unlikely(retval)) {
4661                 /* Queues are down..... */
4662                 retval = -EIO;
4663                 del_timer(&fsf_req->timer);
4664                 spin_lock(&adapter->req_list_lock);
4665                 zfcp_reqlist_remove(adapter, fsf_req);
4666                 spin_unlock(&adapter->req_list_lock);
4667                 /* undo changes in request queue made for this request */
4668                 zfcp_qdio_zero_sbals(req_queue->buffer,
4669                                      fsf_req->sbal_first, fsf_req->sbal_number);
4670                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4671                 req_queue->free_index -= fsf_req->sbal_number;
4672                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4673                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4674                 zfcp_erp_adapter_reopen(adapter, 0, 116, fsf_req);
4675         } else {
4676                 req_queue->distance_from_int = new_distance_from_int;
4677                 /*
4678                  * increase FSF sequence counter -
4679                  * this must only be done for request successfully enqueued to
4680                  * QDIO this rejected requests may be cleaned up by calling
4681                  * routines  resulting in missing sequence counter values
4682                  * otherwise,
4683                  */
4684
4685                 /* Don't increase for unsolicited status */
4686                 if (inc_seq_no)
4687                         adapter->fsf_req_seq_no++;
4688
4689                 /* count FSF requests pending */
4690                 atomic_inc(&adapter->reqs_active);
4691         }
4692         return retval;
4693 }
4694
4695 #undef ZFCP_LOG_AREA