Pileus Git - ~andy/linux/blob - drivers/s390/scsi/zfcp_fsf.c

   1 /*
   2  *
   3  * linux/drivers/s390/scsi/zfcp_fsf.c
   4  *
   5  * FCP adapter driver for IBM eServer zSeries
   6  *
   7  * (C) Copyright IBM Corp. 2002, 2004
   8  *
   9  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  11  *            Aron Zeh
  12  *            Wolfgang Taphorn
  13  *            Stefan Bader <stefan.bader@de.ibm.com>
  14  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  15  *            Andreas Herrmann <aherrman@de.ibm.com>
  16  *            Volker Sameske <sameske@de.ibm.com>
  17  *
  18  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation; either version 2, or (at your option)
  21  * any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  31  */
  32
  33 #define ZFCP_FSF_C_REVISION "$Revision: 1.92 $"
  34
  35 #include "zfcp_ext.h"
  36
  37 static int zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *);
  38 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *);
  39 static int zfcp_fsf_open_port_handler(struct zfcp_fsf_req *);
  40 static int zfcp_fsf_close_port_handler(struct zfcp_fsf_req *);
  41 static int zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *);
  42 static int zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *);
  43 static int zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *);
  44 static int zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *);
  45 static int zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *);
  46 static int zfcp_fsf_send_fcp_command_task_management_handler(
  47         struct zfcp_fsf_req *);
  48 static int zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *);
  49 static int zfcp_fsf_status_read_handler(struct zfcp_fsf_req *);
  50 static int zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *);
  51 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *);
  52 static int zfcp_fsf_control_file_handler(struct zfcp_fsf_req *);
  53 static inline int zfcp_fsf_req_sbal_check(
  54         unsigned long *, struct zfcp_qdio_queue *, int);
  55 static inline int zfcp_use_one_sbal(
  56         struct scatterlist *, int, struct scatterlist *, int);
  57 static struct zfcp_fsf_req *zfcp_fsf_req_alloc(mempool_t *, int);
  58 static int zfcp_fsf_req_send(struct zfcp_fsf_req *, struct timer_list *);
  59 static int zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *);
  60 static int zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *);
  61 static int zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *);
  62 static void zfcp_fsf_link_down_info_eval(struct zfcp_adapter *,
  63         struct fsf_link_down_info *);
  64 static int zfcp_fsf_req_dispatch(struct zfcp_fsf_req *);
  65 static void zfcp_fsf_req_dismiss(struct zfcp_fsf_req *);
  66
  67 /* association between FSF command and FSF QTCB type */
  68 static u32 fsf_qtcb_type[] = {
  69         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  70         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  71         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  72         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  73         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  74         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  75         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  76         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  77         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  78         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  79         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  80         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  81         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  82 };
  83
  84 static const char zfcp_act_subtable_type[5][8] = {
  85         "unknown", "OS", "WWPN", "DID", "LUN"
  86 };
  87
  88 /****************************************************************/
  89 /*************** FSF related Functions  *************************/
  90 /****************************************************************/
  91
  92 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
  93
  94 /*
  95  * function:    zfcp_fsf_req_alloc
  96  *
  97  * purpose:     Obtains an fsf_req and potentially a qtcb (for all but
  98  *              unsolicited requests) via helper functions
  99  *              Does some initial fsf request set-up.
 100  *
 101  * returns:     pointer to allocated fsf_req if successfull
 102  *              NULL otherwise
 103  *
 104  * locks:       none
 105  *
 106  */
 107 static struct zfcp_fsf_req *
 108 zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
 109 {
 110         size_t size;
 111         void *ptr;
 112         struct zfcp_fsf_req *fsf_req = NULL;
 113
 114         if (req_flags & ZFCP_REQ_NO_QTCB)
 115                 size = sizeof(struct zfcp_fsf_req);
 116         else
 117                 size = sizeof(struct zfcp_fsf_req_pool_element);
 118
 119         if (likely(pool != NULL))
 120                 ptr = mempool_alloc(pool, GFP_ATOMIC);
 121         else
 122                 ptr = kmalloc(size, GFP_ATOMIC);
 123
 124         if (unlikely(NULL == ptr))
 125                 goto out;
 126
 127         memset(ptr, 0, size);
 128
 129         if (req_flags & ZFCP_REQ_NO_QTCB) {
 130                 fsf_req = (struct zfcp_fsf_req *) ptr;
 131         } else {
 132                 fsf_req = &((struct zfcp_fsf_req_pool_element *) ptr)->fsf_req;
 133                 fsf_req->qtcb =
 134                         &((struct zfcp_fsf_req_pool_element *) ptr)->qtcb;
 135         }
 136
 137         fsf_req->pool = pool;
 138
 139  out:
 140         return fsf_req;
 141 }
 142
 143 /*
 144  * function:    zfcp_fsf_req_free
 145  *
 146  * purpose:     Frees the memory of an fsf_req (and potentially a qtcb) or
 147  *              returns it into the pool via helper functions.
 148  *
 149  * returns:     sod all
 150  *
 151  * locks:       none
 152  */
 153 void
 154 zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
 155 {
 156         if (likely(fsf_req->pool != NULL))
 157                 mempool_free(fsf_req, fsf_req->pool);
 158         else
 159                 kfree(fsf_req);
 160 }
 161
 162 /*
 163  * function:
 164  *
 165  * purpose:
 166  *
 167  * returns:
 168  *
 169  * note: qdio queues shall be down (no ongoing inbound processing)
 170  */
 171 int
 172 zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 173 {
 174         struct zfcp_fsf_req *fsf_req, *tmp;
 175         unsigned long flags;
 176         LIST_HEAD(remove_queue);
 177
 178         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
 179         list_splice_init(&adapter->fsf_req_list_head, &remove_queue);
 180         atomic_set(&adapter->fsf_reqs_active, 0);
 181         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
 182
 183         list_for_each_entry_safe(fsf_req, tmp, &remove_queue, list) {
 184                 list_del(&fsf_req->list);
 185                 zfcp_fsf_req_dismiss(fsf_req);
 186         }
 187
 188         return 0;
 189 }
 190
 191 /*
 192  * function:
 193  *
 194  * purpose:
 195  *
 196  * returns:
 197  */
 198 static void
 199 zfcp_fsf_req_dismiss(struct zfcp_fsf_req *fsf_req)
 200 {
 201         fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 202         zfcp_fsf_req_complete(fsf_req);
 203 }
 204
 205 /*
 206  * function:    zfcp_fsf_req_complete
 207  *
 208  * purpose:     Updates active counts and timers for openfcp-reqs
 209  *              May cleanup request after req_eval returns
 210  *
 211  * returns:     0 - success
 212  *              !0 - failure
 213  *
 214  * context:
 215  */
 216 int
 217 zfcp_fsf_req_complete(struct zfcp_fsf_req *fsf_req)
 218 {
 219         int retval = 0;
 220         int cleanup;
 221
 222         if (unlikely(fsf_req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 223                 ZFCP_LOG_DEBUG("Status read response received\n");
 224                 /*
 225                  * Note: all cleanup handling is done in the callchain of
 226                  * the function call-chain below.
 227                  */
 228                 zfcp_fsf_status_read_handler(fsf_req);
 229                 goto out;
 230         } else
 231                 zfcp_fsf_protstatus_eval(fsf_req);
 232
 233         /*
 234          * fsf_req may be deleted due to waking up functions, so
 235          * cleanup is saved here and used later
 236          */
 237         if (likely(fsf_req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 238                 cleanup = 1;
 239         else
 240                 cleanup = 0;
 241
 242         fsf_req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 243
 244         /* cleanup request if requested by initiator */
 245         if (likely(cleanup)) {
 246                 ZFCP_LOG_TRACE("removing FSF request %p\n", fsf_req);
 247                 /*
 248                  * lock must not be held here since it will be
 249                  * grabed by the called routine, too
 250                  */
 251                 zfcp_fsf_req_free(fsf_req);
 252         } else {
 253                 /* notify initiator waiting for the requests completion */
 254                 ZFCP_LOG_TRACE("waking initiator of FSF request %p\n",fsf_req);
 255                 /*
 256                  * FIXME: Race! We must not access fsf_req here as it might have been
 257                  * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 258                  * flag. It's an improbable case. But, we have the same paranoia for
 259                  * the cleanup flag already.
 260                  * Might better be handled using complete()?
 261                  * (setting the flag and doing wakeup ought to be atomic
 262                  *  with regard to checking the flag as long as waitqueue is
 263                  *  part of the to be released structure)
 264                  */
 265                 wake_up(&fsf_req->completion_wq);
 266         }
 267
 268  out:
 269         return retval;
 270 }
 271
 272 /*
 273  * function:    zfcp_fsf_protstatus_eval
 274  *
 275  * purpose:     evaluates the QTCB of the finished FSF request
 276  *              and initiates appropriate actions
 277  *              (usually calling FSF command specific handlers)
 278  *
 279  * returns:
 280  *
 281  * context:
 282  *
 283  * locks:
 284  */
 285 static int
 286 zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *fsf_req)
 287 {
 288         int retval = 0;
 289         struct zfcp_adapter *adapter = fsf_req->adapter;
 290         struct fsf_qtcb *qtcb = fsf_req->qtcb;
 291         union fsf_prot_status_qual *prot_status_qual =
 292                 &qtcb->prefix.prot_status_qual;
 293
 294         zfcp_hba_dbf_event_fsf_response(fsf_req);
 295
 296         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 297                 ZFCP_LOG_DEBUG("fsf_req 0x%lx has been dismissed\n",
 298                                (unsigned long) fsf_req);
 299                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 300                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 301                 goto skip_protstatus;
 302         }
 303
 304         /* log additional information provided by FSF (if any) */
 305         if (unlikely(qtcb->header.log_length)) {
 306                 /* do not trust them ;-) */
 307                 if (qtcb->header.log_start > sizeof(struct fsf_qtcb)) {
 308                         ZFCP_LOG_NORMAL
 309                             ("bug: ULP (FSF logging) log data starts "
 310                              "beyond end of packet header. Ignored. "
 311                              "(start=%i, size=%li)\n",
 312                              qtcb->header.log_start,
 313                              sizeof(struct fsf_qtcb));
 314                         goto forget_log;
 315                 }
 316                 if ((size_t) (qtcb->header.log_start + qtcb->header.log_length)
 317                     > sizeof(struct fsf_qtcb)) {
 318                         ZFCP_LOG_NORMAL("bug: ULP (FSF logging) log data ends "
 319                                         "beyond end of packet header. Ignored. "
 320                                         "(start=%i, length=%i, size=%li)\n",
 321                                         qtcb->header.log_start,
 322                                         qtcb->header.log_length,
 323                                         sizeof(struct fsf_qtcb));
 324                         goto forget_log;
 325                 }
 326                 ZFCP_LOG_TRACE("ULP log data: \n");
 327                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 328                               (char *) qtcb + qtcb->header.log_start,
 329                               qtcb->header.log_length);
 330         }
 331  forget_log:
 332
 333         /* evaluate FSF Protocol Status */
 334         switch (qtcb->prefix.prot_status) {
 335
 336         case FSF_PROT_GOOD:
 337         case FSF_PROT_FSF_STATUS_PRESENTED:
 338                 break;
 339
 340         case FSF_PROT_QTCB_VERSION_ERROR:
 341                 ZFCP_LOG_NORMAL("error: The adapter %s contains "
 342                                 "microcode of version 0x%x, the device driver "
 343                                 "only supports 0x%x. Aborting.\n",
 344                                 zfcp_get_busid_by_adapter(adapter),
 345                                 prot_status_qual->version_error.fsf_version,
 346                                 ZFCP_QTCB_VERSION);
 347                 zfcp_erp_adapter_shutdown(adapter, 0);
 348                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 349                 break;
 350
 351         case FSF_PROT_SEQ_NUMB_ERROR:
 352                 ZFCP_LOG_NORMAL("bug: Sequence number mismatch between "
 353                                 "driver (0x%x) and adapter %s (0x%x). "
 354                                 "Restarting all operations on this adapter.\n",
 355                                 qtcb->prefix.req_seq_no,
 356                                 zfcp_get_busid_by_adapter(adapter),
 357                                 prot_status_qual->sequence_error.exp_req_seq_no);
 358                 zfcp_erp_adapter_reopen(adapter, 0);
 359                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 360                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 361                 break;
 362
 363         case FSF_PROT_UNSUPP_QTCB_TYPE:
 364                 ZFCP_LOG_NORMAL("error: Packet header type used by the "
 365                                 "device driver is incompatible with "
 366                                 "that used on adapter %s. "
 367                                 "Stopping all operations on this adapter.\n",
 368                                 zfcp_get_busid_by_adapter(adapter));
 369                 zfcp_erp_adapter_shutdown(adapter, 0);
 370                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 371                 break;
 372
 373         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 374                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 375                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 376                                 &(adapter->status));
 377                 break;
 378
 379         case FSF_PROT_DUPLICATE_REQUEST_ID:
 380                         ZFCP_LOG_NORMAL("bug: The request identifier 0x%Lx "
 381                                         "to the adapter %s is ambiguous. "
 382                                 "Stopping all operations on this adapter.\n",
 383                                 *(unsigned long long*)
 384                                 (&qtcb->bottom.support.req_handle),
 385                                         zfcp_get_busid_by_adapter(adapter));
 386                 zfcp_erp_adapter_shutdown(adapter, 0);
 387                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 388                 break;
 389
 390         case FSF_PROT_LINK_DOWN:
 391                 zfcp_fsf_link_down_info_eval(adapter,
 392                                              &prot_status_qual->link_down_info);
 393                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 394                 break;
 395
 396         case FSF_PROT_REEST_QUEUE:
 397                 ZFCP_LOG_NORMAL("The local link to adapter with "
 398                               "%s was re-plugged. "
 399                               "Re-starting operations on this adapter.\n",
 400                               zfcp_get_busid_by_adapter(adapter));
 401                 /* All ports should be marked as ready to run again */
 402                 zfcp_erp_modify_adapter_status(adapter,
 403                                                ZFCP_STATUS_COMMON_RUNNING,
 404                                                ZFCP_SET);
 405                 zfcp_erp_adapter_reopen(adapter,
 406                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 407                                         | ZFCP_STATUS_COMMON_ERP_FAILED);
 408                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 409                 break;
 410
 411         case FSF_PROT_ERROR_STATE:
 412                 ZFCP_LOG_NORMAL("error: The adapter %s "
 413                                 "has entered the error state. "
 414                                 "Restarting all operations on this "
 415                                 "adapter.\n",
 416                                 zfcp_get_busid_by_adapter(adapter));
 417                 zfcp_erp_adapter_reopen(adapter, 0);
 418                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 419                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 420                 break;
 421
 422         default:
 423                 ZFCP_LOG_NORMAL("bug: Transfer protocol status information "
 424                                 "provided by the adapter %s "
 425                                 "is not compatible with the device driver. "
 426                                 "Stopping all operations on this adapter. "
 427                                 "(debug info 0x%x).\n",
 428                                 zfcp_get_busid_by_adapter(adapter),
 429                                 qtcb->prefix.prot_status);
 430                 zfcp_erp_adapter_shutdown(adapter, 0);
 431                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 432         }
 433
 434  skip_protstatus:
 435         /*
 436          * always call specific handlers to give them a chance to do
 437          * something meaningful even in error cases
 438          */
 439         zfcp_fsf_fsfstatus_eval(fsf_req);
 440         return retval;
 441 }
 442
 443 /*
 444  * function:    zfcp_fsf_fsfstatus_eval
 445  *
 446  * purpose:     evaluates FSF status of completed FSF request
 447  *              and acts accordingly
 448  *
 449  * returns:
 450  */
 451 static int
 452 zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
 453 {
 454         int retval = 0;
 455
 456         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 457                 goto skip_fsfstatus;
 458         }
 459
 460         /* evaluate FSF Status */
 461         switch (fsf_req->qtcb->header.fsf_status) {
 462         case FSF_UNKNOWN_COMMAND:
 463                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 464                                 "not known by the adapter %s "
 465                                 "Stopping all operations on this adapter. "
 466                                 "(debug info 0x%x).\n",
 467                                 zfcp_get_busid_by_adapter(fsf_req->adapter),
 468                                 fsf_req->qtcb->header.fsf_command);
 469                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 470                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 471                 break;
 472
 473         case FSF_FCP_RSP_AVAILABLE:
 474                 ZFCP_LOG_DEBUG("FCP Sense data will be presented to the "
 475                                "SCSI stack.\n");
 476                 break;
 477
 478         case FSF_ADAPTER_STATUS_AVAILABLE:
 479                 zfcp_fsf_fsfstatus_qual_eval(fsf_req);
 480                 break;
 481         }
 482
 483  skip_fsfstatus:
 484         /*
 485          * always call specific handlers to give them a chance to do
 486          * something meaningful even in error cases
 487          */
 488         zfcp_fsf_req_dispatch(fsf_req);
 489
 490         return retval;
 491 }
 492
 493 /*
 494  * function:    zfcp_fsf_fsfstatus_qual_eval
 495  *
 496  * purpose:     evaluates FSF status-qualifier of completed FSF request
 497  *              and acts accordingly
 498  *
 499  * returns:
 500  */
 501 static int
 502 zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
 503 {
 504         int retval = 0;
 505
 506         switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 507         case FSF_SQ_FCP_RSP_AVAILABLE:
 508                 break;
 509         case FSF_SQ_RETRY_IF_POSSIBLE:
 510                 /* The SCSI-stack may now issue retries or escalate */
 511                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 512                 break;
 513         case FSF_SQ_COMMAND_ABORTED:
 514                 /* Carry the aborted state on to upper layer */
 515                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 516                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 517                 break;
 518         case FSF_SQ_NO_RECOM:
 519                 ZFCP_LOG_NORMAL("bug: No recommendation could be given for a"
 520                                 "problem on the adapter %s "
 521                                 "Stopping all operations on this adapter. ",
 522                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 523                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 524                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 525                 break;
 526         case FSF_SQ_ULP_PROGRAMMING_ERROR:
 527                 ZFCP_LOG_NORMAL("error: not enough SBALs for data transfer "
 528                                 "(adapter %s)\n",
 529                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 530                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 531                 break;
 532         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 533         case FSF_SQ_NO_RETRY_POSSIBLE:
 534         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 535                 /* dealt with in the respective functions */
 536                 break;
 537         default:
 538                 ZFCP_LOG_NORMAL("bug: Additional status info could "
 539                                 "not be interpreted properly.\n");
 540                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 541                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
 542                               sizeof (union fsf_status_qual));
 543                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 544                 break;
 545         }
 546
 547         return retval;
 548 }
 549
 550 /**
 551  * zfcp_fsf_link_down_info_eval - evaluate link down information block
 552  */
 553 static void
 554 zfcp_fsf_link_down_info_eval(struct zfcp_adapter *adapter,
 555                              struct fsf_link_down_info *link_down)
 556 {
 557         switch (link_down->error_code) {
 558         case FSF_PSQ_LINK_NO_LIGHT:
 559                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 560                                 "(no light detected)\n",
 561                                 zfcp_get_busid_by_adapter(adapter));
 562                 break;
 563         case FSF_PSQ_LINK_WRAP_PLUG:
 564                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 565                                 "(wrap plug detected)\n",
 566                                 zfcp_get_busid_by_adapter(adapter));
 567                 break;
 568         case FSF_PSQ_LINK_NO_FCP:
 569                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 570                                 "(adjacent node on link does not support FCP)\n",
 571                                 zfcp_get_busid_by_adapter(adapter));
 572                 break;
 573         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 574                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 575                                 "(firmware update in progress)\n",
 576                                 zfcp_get_busid_by_adapter(adapter));
 577                         break;
 578         case FSF_PSQ_LINK_INVALID_WWPN:
 579                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 580                                 "(duplicate or invalid WWPN detected)\n",
 581                                 zfcp_get_busid_by_adapter(adapter));
 582                 break;
 583         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 584                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 585                                 "(no support for NPIV by Fabric)\n",
 586                                 zfcp_get_busid_by_adapter(adapter));
 587                 break;
 588         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 589                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 590                                 "(out of resource in FCP daughtercard)\n",
 591                                 zfcp_get_busid_by_adapter(adapter));
 592                 break;
 593         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 594                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 595                                 "(out of resource in Fabric)\n",
 596                                 zfcp_get_busid_by_adapter(adapter));
 597                 break;
 598         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 599                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 600                                 "(unable to Fabric login)\n",
 601                                 zfcp_get_busid_by_adapter(adapter));
 602                 break;
 603         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 604                 ZFCP_LOG_NORMAL("WWPN assignment file corrupted on adapter %s\n",
 605                                 zfcp_get_busid_by_adapter(adapter));
 606                 break;
 607         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 608                 ZFCP_LOG_NORMAL("Mode table corrupted on adapter %s\n",
 609                                 zfcp_get_busid_by_adapter(adapter));
 610                 break;
 611         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 612                 ZFCP_LOG_NORMAL("No WWPN for assignment table on adapter %s\n",
 613                                 zfcp_get_busid_by_adapter(adapter));
 614                 break;
 615         default:
 616                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 617                                 "(warning: unknown reason code %d)\n",
 618                                 zfcp_get_busid_by_adapter(adapter),
 619                                 link_down->error_code);
 620         }
 621
 622         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 623                 ZFCP_LOG_DEBUG("Debug information to link down: "
 624                                "primary_status=0x%02x "
 625                                "ioerr_code=0x%02x "
 626                                "action_code=0x%02x "
 627                                "reason_code=0x%02x "
 628                                "explanation_code=0x%02x "
 629                                "vendor_specific_code=0x%02x\n",
 630                                 link_down->primary_status,
 631                                 link_down->ioerr_code,
 632                                 link_down->action_code,
 633                                 link_down->reason_code,
 634                                 link_down->explanation_code,
 635                                 link_down->vendor_specific_code);
 636
 637         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 638                               &adapter->status)) {
 639                 atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 640                                 &adapter->status);
 641                 switch (link_down->error_code) {
 642                 case FSF_PSQ_LINK_NO_LIGHT:
 643                 case FSF_PSQ_LINK_WRAP_PLUG:
 644                 case FSF_PSQ_LINK_NO_FCP:
 645                 case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 646                         zfcp_erp_adapter_reopen(adapter, 0);
 647                         break;
 648                 default:
 649                         zfcp_erp_adapter_failed(adapter);
 650                 }
 651         }
 652 }
 653
 654 /*
 655  * function:    zfcp_fsf_req_dispatch
 656  *
 657  * purpose:     calls the appropriate command specific handler
 658  *
 659  * returns:
 660  */
 661 static int
 662 zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
 663 {
 664         struct zfcp_erp_action *erp_action = fsf_req->erp_action;
 665         struct zfcp_adapter *adapter = fsf_req->adapter;
 666         int retval = 0;
 667
 668
 669         switch (fsf_req->fsf_command) {
 670
 671         case FSF_QTCB_FCP_CMND:
 672                 zfcp_fsf_send_fcp_command_handler(fsf_req);
 673                 break;
 674
 675         case FSF_QTCB_ABORT_FCP_CMND:
 676                 zfcp_fsf_abort_fcp_command_handler(fsf_req);
 677                 break;
 678
 679         case FSF_QTCB_SEND_GENERIC:
 680                 zfcp_fsf_send_ct_handler(fsf_req);
 681                 break;
 682
 683         case FSF_QTCB_OPEN_PORT_WITH_DID:
 684                 zfcp_fsf_open_port_handler(fsf_req);
 685                 break;
 686
 687         case FSF_QTCB_OPEN_LUN:
 688                 zfcp_fsf_open_unit_handler(fsf_req);
 689                 break;
 690
 691         case FSF_QTCB_CLOSE_LUN:
 692                 zfcp_fsf_close_unit_handler(fsf_req);
 693                 break;
 694
 695         case FSF_QTCB_CLOSE_PORT:
 696                 zfcp_fsf_close_port_handler(fsf_req);
 697                 break;
 698
 699         case FSF_QTCB_CLOSE_PHYSICAL_PORT:
 700                 zfcp_fsf_close_physical_port_handler(fsf_req);
 701                 break;
 702
 703         case FSF_QTCB_EXCHANGE_CONFIG_DATA:
 704                 zfcp_fsf_exchange_config_data_handler(fsf_req);
 705                 break;
 706
 707         case FSF_QTCB_EXCHANGE_PORT_DATA:
 708                 zfcp_fsf_exchange_port_data_handler(fsf_req);
 709                 break;
 710
 711         case FSF_QTCB_SEND_ELS:
 712                 zfcp_fsf_send_els_handler(fsf_req);
 713                 break;
 714
 715         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 716                 zfcp_fsf_control_file_handler(fsf_req);
 717                 break;
 718
 719         case FSF_QTCB_UPLOAD_CONTROL_FILE:
 720                 zfcp_fsf_control_file_handler(fsf_req);
 721                 break;
 722
 723         default:
 724                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 725                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 726                                 "not supported by the adapter %s\n",
 727                                 zfcp_get_busid_by_adapter(adapter));
 728                 if (fsf_req->fsf_command != fsf_req->qtcb->header.fsf_command)
 729                         ZFCP_LOG_NORMAL
 730                             ("bug: Command issued by the device driver differs "
 731                              "from the command returned by the adapter %s "
 732                              "(debug info 0x%x, 0x%x).\n",
 733                              zfcp_get_busid_by_adapter(adapter),
 734                              fsf_req->fsf_command,
 735                              fsf_req->qtcb->header.fsf_command);
 736         }
 737
 738         if (!erp_action)
 739                 return retval;
 740
 741         zfcp_erp_async_handler(erp_action, 0);
 742
 743         return retval;
 744 }
 745
 746 /*
 747  * function:    zfcp_fsf_status_read
 748  *
 749  * purpose:     initiates a Status Read command at the specified adapter
 750  *
 751  * returns:
 752  */
 753 int
 754 zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
 755 {
 756         struct zfcp_fsf_req *fsf_req;
 757         struct fsf_status_read_buffer *status_buffer;
 758         unsigned long lock_flags;
 759         volatile struct qdio_buffer_element *sbale;
 760         int retval = 0;
 761
 762         /* setup new FSF request */
 763         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 764                                      req_flags | ZFCP_REQ_NO_QTCB,
 765                                      adapter->pool.fsf_req_status_read,
 766                                      &lock_flags, &fsf_req);
 767         if (retval < 0) {
 768                 ZFCP_LOG_INFO("error: Could not create unsolicited status "
 769                               "buffer for adapter %s.\n",
 770                               zfcp_get_busid_by_adapter(adapter));
 771                 goto failed_req_create;
 772         }
 773
 774         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 775         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 776         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 777         fsf_req->sbale_curr = 2;
 778
 779         status_buffer =
 780                 mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 781         if (!status_buffer) {
 782                 ZFCP_LOG_NORMAL("bug: could not get some buffer\n");
 783                 goto failed_buf;
 784         }
 785         memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
 786         fsf_req->data = (unsigned long) status_buffer;
 787
 788         /* insert pointer to respective buffer */
 789         sbale = zfcp_qdio_sbale_curr(fsf_req);
 790         sbale->addr = (void *) status_buffer;
 791         sbale->length = sizeof(struct fsf_status_read_buffer);
 792
 793         /* start QDIO request for this FSF request */
 794         retval = zfcp_fsf_req_send(fsf_req, NULL);
 795         if (retval) {
 796                 ZFCP_LOG_DEBUG("error: Could not set-up unsolicited status "
 797                                "environment.\n");
 798                 goto failed_req_send;
 799         }
 800
 801         ZFCP_LOG_TRACE("Status Read request initiated (adapter%s)\n",
 802                        zfcp_get_busid_by_adapter(adapter));
 803         goto out;
 804
 805  failed_req_send:
 806         mempool_free(status_buffer, adapter->pool.data_status_read);
 807
 808  failed_buf:
 809         zfcp_fsf_req_free(fsf_req);
 810  failed_req_create:
 811         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 812  out:
 813         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 814         return retval;
 815 }
 816
 817 static int
 818 zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
 819 {
 820         struct fsf_status_read_buffer *status_buffer;
 821         struct zfcp_adapter *adapter;
 822         struct zfcp_port *port;
 823         unsigned long flags;
 824
 825         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
 826         adapter = fsf_req->adapter;
 827
 828         read_lock_irqsave(&zfcp_data.config_lock, flags);
 829         list_for_each_entry(port, &adapter->port_list_head, list)
 830             if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
 831                 break;
 832         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 833
 834         if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
 835                 ZFCP_LOG_NORMAL("bug: Reopen port indication received for"
 836                                 "nonexisting port with d_id 0x%08x on "
 837                                 "adapter %s. Ignored.\n",
 838                                 status_buffer->d_id & ZFCP_DID_MASK,
 839                                 zfcp_get_busid_by_adapter(adapter));
 840                 goto out;
 841         }
 842
 843         switch (status_buffer->status_subtype) {
 844
 845         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 846                 debug_text_event(adapter->erp_dbf, 3, "unsol_pc_phys:");
 847                 zfcp_erp_port_reopen(port, 0);
 848                 break;
 849
 850         case FSF_STATUS_READ_SUB_ERROR_PORT:
 851                 debug_text_event(adapter->erp_dbf, 1, "unsol_pc_err:");
 852                 zfcp_erp_port_shutdown(port, 0);
 853                 break;
 854
 855         default:
 856                 debug_text_event(adapter->erp_dbf, 0, "unsol_unk_sub:");
 857                 debug_exception(adapter->erp_dbf, 0,
 858                                 &status_buffer->status_subtype, sizeof (u32));
 859                 ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
 860                                 "for a reopen indication on port with "
 861                                 "d_id 0x%08x on the adapter %s. "
 862                                 "Ignored. (debug info 0x%x)\n",
 863                                 status_buffer->d_id,
 864                                 zfcp_get_busid_by_adapter(adapter),
 865                                 status_buffer->status_subtype);
 866         }
 867  out:
 868         return 0;
 869 }
 870
 871 /*
 872  * function:    zfcp_fsf_status_read_handler
 873  *
 874  * purpose:     is called for finished Open Port command
 875  *
 876  * returns:
 877  */
 878 static int
 879 zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
 880 {
 881         int retval = 0;
 882         struct zfcp_adapter *adapter = fsf_req->adapter;
 883         struct fsf_status_read_buffer *status_buffer =
 884                 (struct fsf_status_read_buffer *) fsf_req->data;
 885
 886         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 887                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, status_buffer);
 888                 mempool_free(status_buffer, adapter->pool.data_status_read);
 889                 zfcp_fsf_req_free(fsf_req);
 890                 goto out;
 891         }
 892
 893         zfcp_hba_dbf_event_fsf_unsol("read", adapter, status_buffer);
 894
 895         switch (status_buffer->status_type) {
 896
 897         case FSF_STATUS_READ_PORT_CLOSED:
 898                 zfcp_fsf_status_read_port_closed(fsf_req);
 899                 break;
 900
 901         case FSF_STATUS_READ_INCOMING_ELS:
 902                 zfcp_fsf_incoming_els(fsf_req);
 903                 break;
 904
 905         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 906                 ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
 907                               zfcp_get_busid_by_adapter(adapter));
 908                 break;
 909
 910         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 911                 ZFCP_LOG_NORMAL("Bit error threshold data received:\n");
 912                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 913                               (char *) status_buffer,
 914                               sizeof (struct fsf_status_read_buffer));
 915                 break;
 916
 917         case FSF_STATUS_READ_LINK_DOWN:
 918                 switch (status_buffer->status_subtype) {
 919                 case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 920                         ZFCP_LOG_INFO("Physical link to adapter %s is down\n",
 921                                       zfcp_get_busid_by_adapter(adapter));
 922                         break;
 923                 case FSF_STATUS_READ_SUB_FDISC_FAILED:
 924                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 925                                       "due to failed FDISC login\n",
 926                               zfcp_get_busid_by_adapter(adapter));
 927                         break;
 928                 case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 929                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 930                                       "due to firmware update on adapter\n",
 931                                       zfcp_get_busid_by_adapter(adapter));
 932                         break;
 933                 default:
 934                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 935                                       "due to unknown reason\n",
 936                                       zfcp_get_busid_by_adapter(adapter));
 937                 };
 938                 zfcp_fsf_link_down_info_eval(adapter,
 939                         (struct fsf_link_down_info *) &status_buffer->payload);
 940                 break;
 941
 942         case FSF_STATUS_READ_LINK_UP:
 943                 ZFCP_LOG_NORMAL("Local link to adapter %s was replugged. "
 944                               "Restarting operations on this adapter\n",
 945                               zfcp_get_busid_by_adapter(adapter));
 946                 /* All ports should be marked as ready to run again */
 947                 zfcp_erp_modify_adapter_status(adapter,
 948                                                ZFCP_STATUS_COMMON_RUNNING,
 949                                                ZFCP_SET);
 950                 zfcp_erp_adapter_reopen(adapter,
 951                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 952                                         | ZFCP_STATUS_COMMON_ERP_FAILED);
 953                 break;
 954
 955         case FSF_STATUS_READ_CFDC_UPDATED:
 956                 ZFCP_LOG_NORMAL("CFDC has been updated on the adapter %s\n",
 957                               zfcp_get_busid_by_adapter(adapter));
 958                 zfcp_erp_adapter_access_changed(adapter);
 959                 break;
 960
 961         case FSF_STATUS_READ_CFDC_HARDENED:
 962                 switch (status_buffer->status_subtype) {
 963                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
 964                         ZFCP_LOG_NORMAL("CFDC of adapter %s saved on SE\n",
 965                                       zfcp_get_busid_by_adapter(adapter));
 966                         break;
 967                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
 968                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been copied "
 969                                       "to the secondary SE\n",
 970                                 zfcp_get_busid_by_adapter(adapter));
 971                         break;
 972                 default:
 973                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been hardened\n",
 974                                       zfcp_get_busid_by_adapter(adapter));
 975                 }
 976                 break;
 977
 978         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 979                 debug_text_event(adapter->erp_dbf, 2, "unsol_features:");
 980                 ZFCP_LOG_INFO("List of supported features on adapter %s has "
 981                               "been changed from 0x%08X to 0x%08X\n",
 982                               zfcp_get_busid_by_adapter(adapter),
 983                               *(u32*) (status_buffer->payload + 4),
 984                               *(u32*) (status_buffer->payload));
 985                 adapter->adapter_features = *(u32*) status_buffer->payload;
 986                 break;
 987
 988         default:
 989                 ZFCP_LOG_NORMAL("warning: An unsolicited status packet of unknown "
 990                                 "type was received (debug info 0x%x)\n",
 991                                 status_buffer->status_type);
 992                 ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
 993                                status_buffer);
 994                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 995                               (char *) status_buffer,
 996                               sizeof (struct fsf_status_read_buffer));
 997                 break;
 998         }
 999         mempool_free(status_buffer, adapter->pool.data_status_read);
1000         zfcp_fsf_req_free(fsf_req);
1001         /*
1002          * recycle buffer and start new request repeat until outbound
1003          * queue is empty or adapter shutdown is requested
1004          */
1005         /*
1006          * FIXME(qdio):
1007          * we may wait in the req_create for 5s during shutdown, so
1008          * qdio_cleanup will have to wait at least that long before returning
1009          * with failure to allow us a proper cleanup under all circumstances
1010          */
1011         /*
1012          * FIXME:
1013          * allocation failure possible? (Is this code needed?)
1014          */
1015         retval = zfcp_fsf_status_read(adapter, 0);
1016         if (retval < 0) {
1017                 ZFCP_LOG_INFO("Failed to create unsolicited status read "
1018                               "request for the adapter %s.\n",
1019                               zfcp_get_busid_by_adapter(adapter));
1020                 /* temporary fix to avoid status read buffer shortage */
1021                 adapter->status_read_failed++;
1022                 if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
1023                     < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
1024                         ZFCP_LOG_INFO("restart adapter %s due to status read "
1025                                       "buffer shortage\n",
1026                                       zfcp_get_busid_by_adapter(adapter));
1027                         zfcp_erp_adapter_reopen(adapter, 0);
1028                 }
1029         }
1030  out:
1031         return retval;
1032 }
1033
1034 /*
1035  * function:    zfcp_fsf_abort_fcp_command
1036  *
1037  * purpose:     tells FSF to abort a running SCSI command
1038  *
1039  * returns:     address of initiated FSF request
1040  *              NULL - request could not be initiated
1041  *
1042  * FIXME(design): should be watched by a timeout !!!
1043  * FIXME(design) shouldn't this be modified to return an int
1044  *               also...don't know how though
1045  */
1046 struct zfcp_fsf_req *
1047 zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
1048                            struct zfcp_adapter *adapter,
1049                            struct zfcp_unit *unit, int req_flags)
1050 {
1051         volatile struct qdio_buffer_element *sbale;
1052         unsigned long lock_flags;
1053         struct zfcp_fsf_req *fsf_req = NULL;
1054         int retval = 0;
1055
1056         /* setup new FSF request */
1057         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
1058                                      req_flags, adapter->pool.fsf_req_abort,
1059                                      &lock_flags, &fsf_req);
1060         if (retval < 0) {
1061                 ZFCP_LOG_INFO("error: Failed to create an abort command "
1062                               "request for lun 0x%016Lx on port 0x%016Lx "
1063                               "on adapter %s.\n",
1064                               unit->fcp_lun,
1065                               unit->port->wwpn,
1066                               zfcp_get_busid_by_adapter(adapter));
1067                 goto out;
1068         }
1069
1070         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1071         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1072         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1073
1074         fsf_req->data = (unsigned long) unit;
1075
1076         /* set handles of unit and its parent port in QTCB */
1077         fsf_req->qtcb->header.lun_handle = unit->handle;
1078         fsf_req->qtcb->header.port_handle = unit->port->handle;
1079
1080         /* set handle of request which should be aborted */
1081         fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1082
1083         /* start QDIO request for this FSF request */
1084
1085         zfcp_fsf_start_scsi_er_timer(adapter);
1086         retval = zfcp_fsf_req_send(fsf_req, NULL);
1087         if (retval) {
1088                 del_timer(&adapter->scsi_er_timer);
1089                 ZFCP_LOG_INFO("error: Failed to send abort command request "
1090                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
1091                               zfcp_get_busid_by_adapter(adapter),
1092                               unit->port->wwpn, unit->fcp_lun);
1093                 zfcp_fsf_req_free(fsf_req);
1094                 fsf_req = NULL;
1095                 goto out;
1096         }
1097
1098         ZFCP_LOG_DEBUG("Abort FCP Command request initiated "
1099                        "(adapter%s, port d_id=0x%08x, "
1100                        "unit x%016Lx, old_req_id=0x%lx)\n",
1101                        zfcp_get_busid_by_adapter(adapter),
1102                        unit->port->d_id,
1103                        unit->fcp_lun, old_req_id);
1104  out:
1105         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
1106         return fsf_req;
1107 }
1108
1109 /*
1110  * function:    zfcp_fsf_abort_fcp_command_handler
1111  *
1112  * purpose:     is called for finished Abort FCP Command request
1113  *
1114  * returns:
1115  */
1116 static int
1117 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
1118 {
1119         int retval = -EINVAL;
1120         struct zfcp_unit *unit;
1121         unsigned char status_qual =
1122             new_fsf_req->qtcb->header.fsf_status_qual.word[0];
1123
1124         del_timer(&new_fsf_req->adapter->scsi_er_timer);
1125
1126         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1127                 /* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
1128                 goto skip_fsfstatus;
1129         }
1130
1131         unit = (struct zfcp_unit *) new_fsf_req->data;
1132
1133         /* evaluate FSF status in QTCB */
1134         switch (new_fsf_req->qtcb->header.fsf_status) {
1135
1136         case FSF_PORT_HANDLE_NOT_VALID:
1137                 if (status_qual >> 4 != status_qual % 0xf) {
1138                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1139                                          "fsf_s_phand_nv0");
1140                         /*
1141                          * In this case a command that was sent prior to a port
1142                          * reopen was aborted (handles are different). This is
1143                          * fine.
1144                          */
1145                 } else {
1146                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1147                                       "port 0x%016Lx on adapter %s invalid. "
1148                                       "This may happen occasionally.\n",
1149                                       unit->port->handle,
1150                                       unit->port->wwpn,
1151                                       zfcp_get_busid_by_unit(unit));
1152                         ZFCP_LOG_INFO("status qualifier:\n");
1153                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1154                                       (char *) &new_fsf_req->qtcb->header.
1155                                       fsf_status_qual,
1156                                       sizeof (union fsf_status_qual));
1157                         /* Let's hope this sorts out the mess */
1158                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1159                                          "fsf_s_phand_nv1");
1160                         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
1161                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1162                 }
1163                 break;
1164
1165         case FSF_LUN_HANDLE_NOT_VALID:
1166                 if (status_qual >> 4 != status_qual % 0xf) {
1167                         /* 2 */
1168                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1169                                          "fsf_s_lhand_nv0");
1170                         /*
1171                          * In this case a command that was sent prior to a unit
1172                          * reopen was aborted (handles are different).
1173                          * This is fine.
1174                          */
1175                 } else {
1176                         ZFCP_LOG_INFO
1177                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1178                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1179                              "invalid. This may happen in rare cases. "
1180                              "Trying to re-establish link.\n",
1181                              unit->handle,
1182                              unit->fcp_lun,
1183                              unit->port->wwpn,
1184                              zfcp_get_busid_by_unit(unit));
1185                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1186                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1187                                       (char *) &new_fsf_req->qtcb->header.
1188                                       fsf_status_qual,
1189                                       sizeof (union fsf_status_qual));
1190                         /* Let's hope this sorts out the mess */
1191                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1192                                          "fsf_s_lhand_nv1");
1193                         zfcp_erp_port_reopen(unit->port, 0);
1194                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1195                 }
1196                 break;
1197
1198         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1199                 retval = 0;
1200                 debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1201                                  "fsf_s_no_exist");
1202                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1203                 break;
1204
1205         case FSF_PORT_BOXED:
1206                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1207                               "be reopened\n", unit->port->wwpn,
1208                               zfcp_get_busid_by_unit(unit));
1209                 debug_text_event(new_fsf_req->adapter->erp_dbf, 2,
1210                                  "fsf_s_pboxed");
1211                 zfcp_erp_port_boxed(unit->port);
1212                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1213                     | ZFCP_STATUS_FSFREQ_RETRY;
1214                 break;
1215
1216         case FSF_LUN_BOXED:
1217                 ZFCP_LOG_INFO(
1218                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1219                         "to be reopened\n",
1220                         unit->fcp_lun, unit->port->wwpn,
1221                         zfcp_get_busid_by_unit(unit));
1222                 debug_text_event(new_fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
1223                 zfcp_erp_unit_boxed(unit);
1224                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1225                         | ZFCP_STATUS_FSFREQ_RETRY;
1226                 break;
1227
1228         case FSF_ADAPTER_STATUS_AVAILABLE:
1229                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1230                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1231                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1232                                          "fsf_sq_ltest");
1233                         zfcp_test_link(unit->port);
1234                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1235                         break;
1236                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1237                         /* SCSI stack will escalate */
1238                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1239                                          "fsf_sq_ulp");
1240                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1241                         break;
1242                 default:
1243                         ZFCP_LOG_NORMAL
1244                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1245                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1246                         debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1247                                          "fsf_sq_inval:");
1248                         debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1249                                         &new_fsf_req->qtcb->header.
1250                                         fsf_status_qual.word[0], sizeof (u32));
1251                         break;
1252                 }
1253                 break;
1254
1255         case FSF_GOOD:
1256                 retval = 0;
1257                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1258                 break;
1259
1260         default:
1261                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1262                                 "(debug info 0x%x)\n",
1263                                 new_fsf_req->qtcb->header.fsf_status);
1264                 debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1265                                  "fsf_s_inval:");
1266                 debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1267                                 &new_fsf_req->qtcb->header.fsf_status,
1268                                 sizeof (u32));
1269                 break;
1270         }
1271  skip_fsfstatus:
1272         return retval;
1273 }
1274
1275 /**
1276  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1277  *      one SBALE
1278  * Two scatter-gather lists are passed, one for the reqeust and one for the
1279  * response.
1280  */
1281 static inline int
1282 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1283                   struct scatterlist *resp, int resp_count)
1284 {
1285         return ((req_count == 1) &&
1286                 (resp_count == 1) &&
1287                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1288                   PAGE_MASK) ==
1289                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1290                                    req[0].length - 1) & PAGE_MASK)) &&
1291                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1292                   PAGE_MASK) ==
1293                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1294                                    resp[0].length - 1) & PAGE_MASK)));
1295 }
1296
1297 /**
1298  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1299  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1300  *      the request
1301  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1302  *      a struct zfcp_fsf_req
1303  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1304  *      is sent within error recovery
1305  */
1306 int
1307 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1308                  struct zfcp_erp_action *erp_action)
1309 {
1310         volatile struct qdio_buffer_element *sbale;
1311         struct zfcp_port *port;
1312         struct zfcp_adapter *adapter;
1313         struct zfcp_fsf_req *fsf_req;
1314         unsigned long lock_flags;
1315         int bytes;
1316         int ret = 0;
1317
1318         port = ct->port;
1319         adapter = port->adapter;
1320
1321         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1322                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1323                                   pool, &lock_flags, &fsf_req);
1324         if (ret < 0) {
1325                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1326                               "adapter: %s\n",
1327                               zfcp_get_busid_by_adapter(adapter));
1328                 goto failed_req;
1329         }
1330
1331         if (erp_action != NULL) {
1332                 erp_action->fsf_req = fsf_req;
1333                 fsf_req->erp_action = erp_action;
1334         }
1335
1336         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1337         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1338                               ct->resp, ct->resp_count)){
1339                 /* both request buffer and response buffer
1340                    fit into one sbale each */
1341                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1342                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1343                 sbale[2].length = ct->req[0].length;
1344                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1345                 sbale[3].length = ct->resp[0].length;
1346                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1347         } else if (adapter->adapter_features &
1348                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1349                 /* try to use chained SBALs */
1350                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1351                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1352                                                 ct->req, ct->req_count,
1353                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1354                 if (bytes <= 0) {
1355                         ZFCP_LOG_INFO("error: creation of CT request failed "
1356                                       "on adapter %s\n",
1357                                       zfcp_get_busid_by_adapter(adapter));
1358                         if (bytes == 0)
1359                                 ret = -ENOMEM;
1360                         else
1361                                 ret = bytes;
1362
1363                         goto failed_send;
1364                 }
1365                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1366                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1367                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1368                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1369                                                 ct->resp, ct->resp_count,
1370                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1371                 if (bytes <= 0) {
1372                         ZFCP_LOG_INFO("error: creation of CT request failed "
1373                                       "on adapter %s\n",
1374                                       zfcp_get_busid_by_adapter(adapter));
1375                         if (bytes == 0)
1376                                 ret = -ENOMEM;
1377                         else
1378                                 ret = bytes;
1379
1380                         goto failed_send;
1381                 }
1382                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1383         } else {
1384                 /* reject send generic request */
1385                 ZFCP_LOG_INFO(
1386                         "error: microcode does not support chained SBALs,"
1387                         "CT request too big (adapter %s)\n",
1388                         zfcp_get_busid_by_adapter(adapter));
1389                 ret = -EOPNOTSUPP;
1390                 goto failed_send;
1391         }
1392
1393         /* settings in QTCB */
1394         fsf_req->qtcb->header.port_handle = port->handle;
1395         fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
1396         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1397         fsf_req->data = (unsigned long) ct;
1398
1399         zfcp_san_dbf_event_ct_request(fsf_req);
1400
1401         /* start QDIO request for this FSF request */
1402         ret = zfcp_fsf_req_send(fsf_req, ct->timer);
1403         if (ret) {
1404                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1405                                "(adapter %s, port 0x%016Lx)\n",
1406                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1407                 goto failed_send;
1408         }
1409
1410         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1411                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1412         goto out;
1413
1414  failed_send:
1415         zfcp_fsf_req_free(fsf_req);
1416         if (erp_action != NULL) {
1417                 erp_action->fsf_req = NULL;
1418         }
1419  failed_req:
1420  out:
1421         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1422                                 lock_flags);
1423         return ret;
1424 }
1425
1426 /**
1427  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1428  * @fsf_req: pointer to struct zfcp_fsf_req
1429  *
1430  * Data specific for the Generic Service request is passed using
1431  * fsf_req->data. There we find the pointer to struct zfcp_send_ct.
1432  * Usually a specific handler for the CT request is called which is
1433  * found in this structure.
1434  */
1435 static int
1436 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1437 {
1438         struct zfcp_port *port;
1439         struct zfcp_adapter *adapter;
1440         struct zfcp_send_ct *send_ct;
1441         struct fsf_qtcb_header *header;
1442         struct fsf_qtcb_bottom_support *bottom;
1443         int retval = -EINVAL;
1444         u16 subtable, rule, counter;
1445
1446         adapter = fsf_req->adapter;
1447         send_ct = (struct zfcp_send_ct *) fsf_req->data;
1448         port = send_ct->port;
1449         header = &fsf_req->qtcb->header;
1450         bottom = &fsf_req->qtcb->bottom.support;
1451
1452         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1453                 goto skip_fsfstatus;
1454
1455         /* evaluate FSF status in QTCB */
1456         switch (header->fsf_status) {
1457
1458         case FSF_GOOD:
1459                 zfcp_san_dbf_event_ct_response(fsf_req);
1460                 retval = 0;
1461                 break;
1462
1463         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1464                 if (adapter->fc_service_class <= 3) {
1465                         ZFCP_LOG_INFO("error: adapter %s does not support fc "
1466                                       "class %d.\n",
1467                                       zfcp_get_busid_by_port(port),
1468                                       adapter->fc_service_class);
1469                 } else {
1470                         ZFCP_LOG_INFO("bug: The fibre channel class at the "
1471                                       "adapter %s is invalid. "
1472                                       "(debug info %d)\n",
1473                                       zfcp_get_busid_by_port(port),
1474                                       adapter->fc_service_class);
1475                 }
1476                 /* stop operation for this adapter */
1477                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1478                 zfcp_erp_adapter_shutdown(adapter, 0);
1479                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1480                 break;
1481
1482         case FSF_ADAPTER_STATUS_AVAILABLE:
1483                 switch (header->fsf_status_qual.word[0]){
1484                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1485                         /* reopening link to port */
1486                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1487                         zfcp_test_link(port);
1488                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1489                         break;
1490                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1491                         /* ERP strategy will escalate */
1492                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1493                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1494                         break;
1495                 default:
1496                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1497                                       "arrived.\n",
1498                                       header->fsf_status_qual.word[0]);
1499                         break;
1500                 }
1501                 break;
1502
1503         case FSF_ACCESS_DENIED:
1504                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1505                                 "command (adapter %s, port d_id=0x%08x)\n",
1506                                 zfcp_get_busid_by_port(port), port->d_id);
1507                 for (counter = 0; counter < 2; counter++) {
1508                         subtable = header->fsf_status_qual.halfword[counter * 2];
1509                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1510                         switch (subtable) {
1511                         case FSF_SQ_CFDC_SUBTABLE_OS:
1512                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1513                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1514                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1515                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1516                                         zfcp_act_subtable_type[subtable], rule);
1517                                 break;
1518                         }
1519                 }
1520                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1521                 zfcp_erp_port_access_denied(port);
1522                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1523                 break;
1524
1525         case FSF_GENERIC_COMMAND_REJECTED:
1526                 ZFCP_LOG_INFO("generic service command rejected "
1527                               "(adapter %s, port d_id=0x%08x)\n",
1528                               zfcp_get_busid_by_port(port), port->d_id);
1529                 ZFCP_LOG_INFO("status qualifier:\n");
1530                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1531                               (char *) &header->fsf_status_qual,
1532                               sizeof (union fsf_status_qual));
1533                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_gcom_rej");
1534                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1535                 break;
1536
1537         case FSF_PORT_HANDLE_NOT_VALID:
1538                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1539                                "0x%016Lx on adapter %s invalid. This may "
1540                                "happen occasionally.\n", port->handle,
1541                                port->wwpn, zfcp_get_busid_by_port(port));
1542                 ZFCP_LOG_INFO("status qualifier:\n");
1543                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1544                               (char *) &header->fsf_status_qual,
1545                               sizeof (union fsf_status_qual));
1546                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_phandle_nv");
1547                 zfcp_erp_adapter_reopen(adapter, 0);
1548                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1549                 break;
1550
1551         case FSF_PORT_BOXED:
1552                 ZFCP_LOG_INFO("port needs to be reopened "
1553                               "(adapter %s, port d_id=0x%08x)\n",
1554                               zfcp_get_busid_by_port(port), port->d_id);
1555                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
1556                 zfcp_erp_port_boxed(port);
1557                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1558                     | ZFCP_STATUS_FSFREQ_RETRY;
1559                 break;
1560
1561         /* following states should never occure, all cases avoided
1562            in zfcp_fsf_send_ct - but who knows ... */
1563         case FSF_PAYLOAD_SIZE_MISMATCH:
1564                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1565                               "req_buf_length=%d, resp_buf_length=%d)\n",
1566                               zfcp_get_busid_by_adapter(adapter),
1567                               bottom->req_buf_length, bottom->resp_buf_length);
1568                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1569                 break;
1570         case FSF_REQUEST_SIZE_TOO_LARGE:
1571                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1572                               "req_buf_length=%d)\n",
1573                               zfcp_get_busid_by_adapter(adapter),
1574                               bottom->req_buf_length);
1575                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1576                 break;
1577         case FSF_RESPONSE_SIZE_TOO_LARGE:
1578                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1579                               "resp_buf_length=%d)\n",
1580                               zfcp_get_busid_by_adapter(adapter),
1581                               bottom->resp_buf_length);
1582                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1583                 break;
1584         case FSF_SBAL_MISMATCH:
1585                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1586                               "resp_buf_length=%d)\n",
1587                               zfcp_get_busid_by_adapter(adapter),
1588                               bottom->req_buf_length, bottom->resp_buf_length);
1589                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1590                 break;
1591
1592        default:
1593                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1594                                 "(debug info 0x%x)\n", header->fsf_status);
1595                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval:");
1596                 debug_exception(adapter->erp_dbf, 0,
1597                                 &header->fsf_status_qual.word[0], sizeof (u32));
1598                 break;
1599         }
1600
1601 skip_fsfstatus:
1602         send_ct->status = retval;
1603
1604         if (send_ct->handler != NULL)
1605                 send_ct->handler(send_ct->handler_data);
1606
1607         return retval;
1608 }
1609
1610 /**
1611  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1612  * @els: pointer to struct zfcp_send_els which contains all needed data for
1613  *      the command.
1614  */
1615 int
1616 zfcp_fsf_send_els(struct zfcp_send_els *els)
1617 {
1618         volatile struct qdio_buffer_element *sbale;
1619         struct zfcp_fsf_req *fsf_req;
1620         u32 d_id;
1621         struct zfcp_adapter *adapter;
1622         unsigned long lock_flags;
1623         int bytes;
1624         int ret = 0;
1625
1626         d_id = els->d_id;
1627         adapter = els->adapter;
1628
1629         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1630                                   ZFCP_REQ_AUTO_CLEANUP,
1631                                   NULL, &lock_flags, &fsf_req);
1632         if (ret < 0) {
1633                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1634                               "(adapter %s, port d_id: 0x%08x)\n",
1635                               zfcp_get_busid_by_adapter(adapter), d_id);
1636                 goto failed_req;
1637         }
1638
1639         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1640         if (zfcp_use_one_sbal(els->req, els->req_count,
1641                               els->resp, els->resp_count)){
1642                 /* both request buffer and response buffer
1643                    fit into one sbale each */
1644                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1645                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1646                 sbale[2].length = els->req[0].length;
1647                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1648                 sbale[3].length = els->resp[0].length;
1649                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1650         } else if (adapter->adapter_features &
1651                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1652                 /* try to use chained SBALs */
1653                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1654                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1655                                                 els->req, els->req_count,
1656                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1657                 if (bytes <= 0) {
1658                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1659                                       "(adapter %s, port d_id: 0x%08x)\n",
1660                                       zfcp_get_busid_by_adapter(adapter), d_id);
1661                         if (bytes == 0) {
1662                                 ret = -ENOMEM;
1663                         } else {
1664                                 ret = bytes;
1665                         }
1666                         goto failed_send;
1667                 }
1668                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1669                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1670                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1671                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1672                                                 els->resp, els->resp_count,
1673                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1674                 if (bytes <= 0) {
1675                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1676                                       "(adapter %s, port d_id: 0x%08x)\n",
1677                                       zfcp_get_busid_by_adapter(adapter), d_id);
1678                         if (bytes == 0) {
1679                                 ret = -ENOMEM;
1680                         } else {
1681                                 ret = bytes;
1682                         }
1683                         goto failed_send;
1684                 }
1685                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1686         } else {
1687                 /* reject request */
1688                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1689                               ", ELS request too big (adapter %s, "
1690                               "port d_id: 0x%08x)\n",
1691                               zfcp_get_busid_by_adapter(adapter), d_id);
1692                 ret = -EOPNOTSUPP;
1693                 goto failed_send;
1694         }
1695
1696         /* settings in QTCB */
1697         fsf_req->qtcb->bottom.support.d_id = d_id;
1698         fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
1699         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1700         fsf_req->data = (unsigned long) els;
1701
1702         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1703
1704         zfcp_san_dbf_event_els_request(fsf_req);
1705
1706         /* start QDIO request for this FSF request */
1707         ret = zfcp_fsf_req_send(fsf_req, els->timer);
1708         if (ret) {
1709                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1710                                "(adapter %s, port d_id: 0x%08x)\n",
1711                                zfcp_get_busid_by_adapter(adapter), d_id);
1712                 goto failed_send;
1713         }
1714
1715         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1716                        "0x%08x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1717         goto out;
1718
1719  failed_send:
1720         zfcp_fsf_req_free(fsf_req);
1721
1722  failed_req:
1723  out:
1724         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1725                                 lock_flags);
1726
1727         return ret;
1728 }
1729
1730 /**
1731  * zfcp_fsf_send_els_handler - handler for ELS commands
1732  * @fsf_req: pointer to struct zfcp_fsf_req
1733  *
1734  * Data specific for the ELS command is passed using
1735  * fsf_req->data. There we find the pointer to struct zfcp_send_els.
1736  * Usually a specific handler for the ELS command is called which is
1737  * found in this structure.
1738  */
1739 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1740 {
1741         struct zfcp_adapter *adapter;
1742         struct zfcp_port *port;
1743         u32 d_id;
1744         struct fsf_qtcb_header *header;
1745         struct fsf_qtcb_bottom_support *bottom;
1746         struct zfcp_send_els *send_els;
1747         int retval = -EINVAL;
1748         u16 subtable, rule, counter;
1749
1750         send_els = (struct zfcp_send_els *) fsf_req->data;
1751         adapter = send_els->adapter;
1752         port = send_els->port;
1753         d_id = send_els->d_id;
1754         header = &fsf_req->qtcb->header;
1755         bottom = &fsf_req->qtcb->bottom.support;
1756
1757         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1758                 goto skip_fsfstatus;
1759
1760         switch (header->fsf_status) {
1761
1762         case FSF_GOOD:
1763                 zfcp_san_dbf_event_els_response(fsf_req);
1764                 retval = 0;
1765                 break;
1766
1767         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1768                 if (adapter->fc_service_class <= 3) {
1769                         ZFCP_LOG_INFO("error: adapter %s does "
1770                                       "not support fibrechannel class %d.\n",
1771                                       zfcp_get_busid_by_adapter(adapter),
1772                                       adapter->fc_service_class);
1773                 } else {
1774                         ZFCP_LOG_INFO("bug: The fibrechannel class at "
1775                                       "adapter %s is invalid. "
1776                                       "(debug info %d)\n",
1777                                       zfcp_get_busid_by_adapter(adapter),
1778                                       adapter->fc_service_class);
1779                 }
1780                 /* stop operation for this adapter */
1781                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1782                 zfcp_erp_adapter_shutdown(adapter, 0);
1783                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1784                 break;
1785
1786         case FSF_ADAPTER_STATUS_AVAILABLE:
1787                 switch (header->fsf_status_qual.word[0]){
1788                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1789                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1790                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1791                                 zfcp_test_link(port);
1792                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1793                         break;
1794                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1795                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1796                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1797                         retval =
1798                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1799                                               (struct zfcp_ls_rjt_par *)
1800                                               &header->fsf_status_qual.word[2]);
1801                         break;
1802                 case FSF_SQ_RETRY_IF_POSSIBLE:
1803                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_retry");
1804                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1805                         break;
1806                 default:
1807                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1808                                       header->fsf_status_qual.word[0]);
1809                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1810                                 (char*)header->fsf_status_qual.word, 16);
1811                 }
1812                 break;
1813
1814         case FSF_ELS_COMMAND_REJECTED:
1815                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1816                               "prohibited sending "
1817                               "(adapter: %s, port d_id: 0x%08x)\n",
1818                               zfcp_get_busid_by_adapter(adapter), d_id);
1819
1820                 break;
1821
1822         case FSF_PAYLOAD_SIZE_MISMATCH:
1823                 ZFCP_LOG_INFO(
1824                         "ELS request size and ELS response size must be either "
1825                         "both 0, or both greater than 0 "
1826                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1827                         zfcp_get_busid_by_adapter(adapter),
1828                         bottom->req_buf_length,
1829                         bottom->resp_buf_length);
1830                 break;
1831
1832         case FSF_REQUEST_SIZE_TOO_LARGE:
1833                 ZFCP_LOG_INFO(
1834                         "Length of the ELS request buffer, "
1835                         "specified in QTCB bottom, "
1836                         "exceeds the size of the buffers "
1837                         "that have been allocated for ELS request data "
1838                         "(adapter: %s, req_buf_length=%d)\n",
1839                         zfcp_get_busid_by_adapter(adapter),
1840                         bottom->req_buf_length);
1841                 break;
1842
1843         case FSF_RESPONSE_SIZE_TOO_LARGE:
1844                 ZFCP_LOG_INFO(
1845                         "Length of the ELS response buffer, "
1846                         "specified in QTCB bottom, "
1847                         "exceeds the size of the buffers "
1848                         "that have been allocated for ELS response data "
1849                         "(adapter: %s, resp_buf_length=%d)\n",
1850                         zfcp_get_busid_by_adapter(adapter),
1851                         bottom->resp_buf_length);
1852                 break;
1853
1854         case FSF_SBAL_MISMATCH:
1855                 /* should never occure, avoided in zfcp_fsf_send_els */
1856                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1857                               "resp_buf_length=%d)\n",
1858                               zfcp_get_busid_by_adapter(adapter),
1859                               bottom->req_buf_length, bottom->resp_buf_length);
1860                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1861                 break;
1862
1863         case FSF_ACCESS_DENIED:
1864                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1865                                 "(adapter %s, port d_id=0x%08x)\n",
1866                                 zfcp_get_busid_by_adapter(adapter), d_id);
1867                 for (counter = 0; counter < 2; counter++) {
1868                         subtable = header->fsf_status_qual.halfword[counter * 2];
1869                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1870                         switch (subtable) {
1871                         case FSF_SQ_CFDC_SUBTABLE_OS:
1872                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1873                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1874                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1875                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1876                                         zfcp_act_subtable_type[subtable], rule);
1877                                 break;
1878                         }
1879                 }
1880                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1881                 if (port != NULL)
1882                         zfcp_erp_port_access_denied(port);
1883                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1884                 break;
1885
1886         default:
1887                 ZFCP_LOG_NORMAL(
1888                         "bug: An unknown FSF Status was presented "
1889                         "(adapter: %s, fsf_status=0x%08x)\n",
1890                         zfcp_get_busid_by_adapter(adapter),
1891                         header->fsf_status);
1892                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval");
1893                 debug_exception(adapter->erp_dbf, 0,
1894                         &header->fsf_status_qual.word[0], sizeof(u32));
1895                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1896                 break;
1897         }
1898
1899 skip_fsfstatus:
1900         send_els->status = retval;
1901
1902         if (send_els->handler != 0)
1903                 send_els->handler(send_els->handler_data);
1904
1905         return retval;
1906 }
1907
1908 /*
1909  * function:
1910  *
1911  * purpose:
1912  *
1913  * returns:     address of initiated FSF request
1914  *              NULL - request could not be initiated
1915  */
1916 int
1917 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1918 {
1919         volatile struct qdio_buffer_element *sbale;
1920         unsigned long lock_flags;
1921         int retval = 0;
1922
1923         /* setup new FSF request */
1924         retval = zfcp_fsf_req_create(erp_action->adapter,
1925                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1926                                      ZFCP_REQ_AUTO_CLEANUP,
1927                                      erp_action->adapter->pool.fsf_req_erp,
1928                                      &lock_flags, &(erp_action->fsf_req));
1929         if (retval < 0) {
1930                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1931                               "data request for adapter %s.\n",
1932                               zfcp_get_busid_by_adapter(erp_action->adapter));
1933                 goto out;
1934         }
1935
1936         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
1937                                     erp_action->fsf_req->sbal_curr, 0);
1938         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1939         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1940
1941         erp_action->fsf_req->erp_action = erp_action;
1942         erp_action->fsf_req->qtcb->bottom.config.feature_selection =
1943                         FSF_FEATURE_CFDC |
1944                         FSF_FEATURE_LUN_SHARING |
1945                         FSF_FEATURE_UPDATE_ALERT;
1946
1947         /* start QDIO request for this FSF request */
1948         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
1949         if (retval) {
1950                 ZFCP_LOG_INFO
1951                     ("error: Could not send exchange configuration data "
1952                      "command on the adapter %s\n",
1953                      zfcp_get_busid_by_adapter(erp_action->adapter));
1954                 zfcp_fsf_req_free(erp_action->fsf_req);
1955                 erp_action->fsf_req = NULL;
1956                 goto out;
1957         }
1958
1959         ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1960                        "(adapter %s)\n",
1961                        zfcp_get_busid_by_adapter(erp_action->adapter));
1962
1963  out:
1964         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
1965                                 lock_flags);
1966         return retval;
1967 }
1968
1969 /**
1970  * zfcp_fsf_exchange_config_evaluate
1971  * @fsf_req: fsf_req which belongs to xchg config data request
1972  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1973  *
1974  * returns: -EIO on error, 0 otherwise
1975  */
1976 static int
1977 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
1978 {
1979         struct fsf_qtcb_bottom_config *bottom;
1980         struct zfcp_adapter *adapter = fsf_req->adapter;
1981         struct Scsi_Host *shost = adapter->scsi_host;
1982
1983         bottom = &fsf_req->qtcb->bottom.config;
1984         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
1985                        bottom->low_qtcb_version, bottom->high_qtcb_version);
1986         adapter->fsf_lic_version = bottom->lic_version;
1987         adapter->adapter_features = bottom->adapter_features;
1988         adapter->connection_features = bottom->connection_features;
1989         adapter->peer_wwpn = 0;
1990         adapter->peer_wwnn = 0;
1991         adapter->peer_d_id = 0;
1992
1993         if (xchg_ok) {
1994                 fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
1995                 fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
1996                 fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
1997                 fc_host_speed(shost) = bottom->fc_link_speed;
1998                 fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
1999                 adapter->fc_topology = bottom->fc_topology;
2000                 adapter->hydra_version = bottom->adapter_type;
2001                 if (adapter->physical_wwpn == 0)
2002                         adapter->physical_wwpn = fc_host_port_name(shost);
2003                 if (adapter->physical_s_id == 0)
2004                         adapter->physical_s_id = fc_host_port_id(shost);
2005         } else {
2006                 fc_host_node_name(shost) = 0;
2007                 fc_host_port_name(shost) = 0;
2008                 fc_host_port_id(shost) = 0;
2009                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
2010                 adapter->fc_topology = 0;
2011                 adapter->hydra_version = 0;
2012         }
2013
2014         if (adapter->fc_topology == FSF_TOPO_P2P) {
2015                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2016                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2017                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2018         }
2019
2020         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
2021                 adapter->hardware_version = bottom->hardware_version;
2022                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
2023                        min(FC_SERIAL_NUMBER_SIZE, 17));
2024                 EBCASC(fc_host_serial_number(shost),
2025                        min(FC_SERIAL_NUMBER_SIZE, 17));
2026         }
2027
2028         ZFCP_LOG_NORMAL("The adapter %s reported the following characteristics:\n"
2029                         "WWNN 0x%016Lx, "
2030                         "WWPN 0x%016Lx, "
2031                         "S_ID 0x%08x,\n"
2032                         "adapter version 0x%x, "
2033                         "LIC version 0x%x, "
2034                         "FC link speed %d Gb/s\n",
2035                         zfcp_get_busid_by_adapter(adapter),
2036                         (wwn_t) fc_host_node_name(shost),
2037                         (wwn_t) fc_host_port_name(shost),
2038                         fc_host_port_id(shost),
2039                         adapter->hydra_version,
2040                         adapter->fsf_lic_version,
2041                         fc_host_speed(shost));
2042         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2043                 ZFCP_LOG_NORMAL("error: the adapter %s "
2044                                 "only supports newer control block "
2045                                 "versions in comparison to this device "
2046                                 "driver (try updated device driver)\n",
2047                                 zfcp_get_busid_by_adapter(adapter));
2048                 debug_text_event(adapter->erp_dbf, 0, "low_qtcb_ver");
2049                 zfcp_erp_adapter_shutdown(adapter, 0);
2050                 return -EIO;
2051         }
2052         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2053                 ZFCP_LOG_NORMAL("error: the adapter %s "
2054                                 "only supports older control block "
2055                                 "versions than this device driver uses"
2056                                 "(consider a microcode upgrade)\n",
2057                                 zfcp_get_busid_by_adapter(adapter));
2058                 debug_text_event(adapter->erp_dbf, 0, "high_qtcb_ver");
2059                 zfcp_erp_adapter_shutdown(adapter, 0);
2060                 return -EIO;
2061         }
2062         return 0;
2063 }
2064
2065 /*
2066  * function:    zfcp_fsf_exchange_config_data_handler
2067  *
2068  * purpose:     is called for finished Exchange Configuration Data command
2069  *
2070  * returns:
2071  */
2072 static int
2073 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2074 {
2075         struct fsf_qtcb_bottom_config *bottom;
2076         struct zfcp_adapter *adapter = fsf_req->adapter;
2077         struct fsf_qtcb *qtcb = fsf_req->qtcb;
2078
2079         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2080                 return -EIO;
2081
2082         switch (qtcb->header.fsf_status) {
2083
2084         case FSF_GOOD:
2085                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2086                         return -EIO;
2087
2088                 switch (adapter->fc_topology) {
2089                 case FSF_TOPO_P2P:
2090                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2091                                         "configuration detected at adapter %s\n"
2092                                         "Peer WWNN 0x%016llx, "
2093                                         "peer WWPN 0x%016llx, "
2094                                         "peer d_id 0x%06x\n",
2095                                         zfcp_get_busid_by_adapter(adapter),
2096                                         adapter->peer_wwnn,
2097                                         adapter->peer_wwpn,
2098                                         adapter->peer_d_id);
2099                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2100                                          "top-p-to-p");
2101                         break;
2102                 case FSF_TOPO_AL:
2103                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2104                                         "topology detected at adapter %s "
2105                                         "unsupported, shutting down adapter\n",
2106                                         zfcp_get_busid_by_adapter(adapter));
2107                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2108                                          "top-al");
2109                         zfcp_erp_adapter_shutdown(adapter, 0);
2110                         return -EIO;
2111                 case FSF_TOPO_FABRIC:
2112                         ZFCP_LOG_NORMAL("Switched fabric fibrechannel "
2113                                       "network detected at adapter %s.\n",
2114                                       zfcp_get_busid_by_adapter(adapter));
2115                         break;
2116                 default:
2117                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2118                                         "reported by the exchange "
2119                                         "configuration command for "
2120                                         "the adapter %s is not "
2121                                         "of a type known to the zfcp "
2122                                         "driver, shutting down adapter\n",
2123                                         zfcp_get_busid_by_adapter(adapter));
2124                         adapter->fc_topology = FSF_TOPO_ERROR;
2125                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2126                                              "unknown-topo");
2127                         zfcp_erp_adapter_shutdown(adapter, 0);
2128                         return -EIO;
2129                 }
2130                 bottom = &qtcb->bottom.config;
2131                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2132                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2133                                         "allowed by the adapter %s "
2134                                         "is lower than the minimum "
2135                                         "required by the driver (%ld bytes).\n",
2136                                         bottom->max_qtcb_size,
2137                                         zfcp_get_busid_by_adapter(adapter),
2138                                         sizeof(struct fsf_qtcb));
2139                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2140                                          "qtcb-size");
2141                         debug_event(fsf_req->adapter->erp_dbf, 0,
2142                                     &bottom->max_qtcb_size, sizeof (u32));
2143                         zfcp_erp_adapter_shutdown(adapter, 0);
2144                         return -EIO;
2145                 }
2146                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2147                                 &adapter->status);
2148                 break;
2149         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2150                 debug_text_event(adapter->erp_dbf, 0, "xchg-inco");
2151
2152                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2153                         return -EIO;
2154
2155                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
2156
2157                 zfcp_fsf_link_down_info_eval(adapter,
2158                         &qtcb->header.fsf_status_qual.link_down_info);
2159                 break;
2160         default:
2161                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf-stat-ng");
2162                 debug_event(fsf_req->adapter->erp_dbf, 0,
2163                             &fsf_req->qtcb->header.fsf_status, sizeof (u32));
2164                 zfcp_erp_adapter_shutdown(adapter, 0);
2165                 return -EIO;
2166         }
2167         return 0;
2168 }
2169
2170 /**
2171  * zfcp_fsf_exchange_port_data - request information about local port
2172  * @erp_action: ERP action for the adapter for which port data is requested
2173  * @adapter: for which port data is requested
2174  * @data: response to exchange port data request
2175  */
2176 int
2177 zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action,
2178                             struct zfcp_adapter *adapter,
2179                             struct fsf_qtcb_bottom_port *data)
2180 {
2181         volatile struct qdio_buffer_element *sbale;
2182         int retval = 0;
2183         unsigned long lock_flags;
2184         struct zfcp_fsf_req *fsf_req;
2185         struct timer_list *timer;
2186
2187         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2188                 ZFCP_LOG_INFO("error: exchange port data "
2189                               "command not supported by adapter %s\n",
2190                               zfcp_get_busid_by_adapter(adapter));
2191                 return -EOPNOTSUPP;
2192         }
2193
2194         /* setup new FSF request */
2195         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2196                                      erp_action ? ZFCP_REQ_AUTO_CLEANUP : 0,
2197                                      0, &lock_flags, &fsf_req);
2198         if (retval < 0) {
2199                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2200                               "exchange port data request for"
2201                               "the adapter %s.\n",
2202                               zfcp_get_busid_by_adapter(adapter));
2203                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2204                                         lock_flags);
2205                 return retval;
2206         }
2207
2208         if (data)
2209                 fsf_req->data = (unsigned long) data;
2210
2211         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2212         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2213         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2214
2215         if (erp_action) {
2216                 erp_action->fsf_req = fsf_req;
2217                 fsf_req->erp_action = erp_action;
2218                 timer = &erp_action->timer;
2219         } else {
2220                 timer = kmalloc(sizeof(struct timer_list), GFP_ATOMIC);
2221                 if (!timer) {
2222                         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2223                                                 lock_flags);
2224                         zfcp_fsf_req_free(fsf_req);
2225                         return -ENOMEM;
2226                 }
2227                 init_timer(timer);
2228                 timer->function = zfcp_fsf_request_timeout_handler;
2229                 timer->data = (unsigned long) adapter;
2230                 timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
2231         }
2232
2233         retval = zfcp_fsf_req_send(fsf_req, timer);
2234         if (retval) {
2235                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2236                               "command on the adapter %s\n",
2237                               zfcp_get_busid_by_adapter(adapter));
2238                 zfcp_fsf_req_free(fsf_req);
2239                 if (erp_action)
2240                         erp_action->fsf_req = NULL;
2241                 else
2242                         kfree(timer);
2243                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2244                                         lock_flags);
2245                 return retval;
2246         }
2247
2248         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2249
2250         if (!erp_action) {
2251                 wait_event(fsf_req->completion_wq,
2252                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2253                 del_timer_sync(timer);
2254                 zfcp_fsf_req_free(fsf_req);
2255                 kfree(timer);
2256         }
2257         return retval;
2258 }
2259
2260
2261 /**
2262  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2263  * @fsf_req: pointer to struct zfcp_fsf_req
2264  */
2265 static void
2266 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2267 {
2268         struct zfcp_adapter *adapter = fsf_req->adapter;
2269         struct Scsi_Host *shost = adapter->scsi_host;
2270         struct fsf_qtcb *qtcb = fsf_req->qtcb;
2271         struct fsf_qtcb_bottom_port *bottom, *data;
2272
2273         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2274                 return;
2275
2276         switch (qtcb->header.fsf_status) {
2277         case FSF_GOOD:
2278                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2279
2280                 bottom = &qtcb->bottom.port;
2281                 data = (struct fsf_qtcb_bottom_port*) fsf_req->data;
2282                 if (data)
2283                         memcpy(data, bottom, sizeof(struct fsf_qtcb_bottom_port));
2284                 if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) {
2285                         adapter->physical_wwpn = bottom->wwpn;
2286                         adapter->physical_s_id = bottom->fc_port_id;
2287                 } else {
2288                         adapter->physical_wwpn = fc_host_port_name(shost);
2289                         adapter->physical_s_id = fc_host_port_id(shost);
2290                 }
2291                 fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
2292                 break;
2293
2294         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2295                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2296
2297                 zfcp_fsf_link_down_info_eval(adapter,
2298                         &qtcb->header.fsf_status_qual.link_down_info);
2299                 break;
2300
2301         default:
2302                 debug_text_event(adapter->erp_dbf, 0, "xchg-port-ng");
2303                 debug_event(adapter->erp_dbf, 0,
2304                             &fsf_req->qtcb->header.fsf_status, sizeof(u32));
2305         }
2306 }
2307
2308
2309 /*
2310  * function:    zfcp_fsf_open_port
2311  *
2312  * purpose:
2313  *
2314  * returns:     address of initiated FSF request
2315  *              NULL - request could not be initiated
2316  */
2317 int
2318 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2319 {
2320         volatile struct qdio_buffer_element *sbale;
2321         unsigned long lock_flags;
2322         int retval = 0;
2323
2324         /* setup new FSF request */
2325         retval = zfcp_fsf_req_create(erp_action->adapter,
2326                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2327                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2328                                      erp_action->adapter->pool.fsf_req_erp,
2329                                      &lock_flags, &(erp_action->fsf_req));
2330         if (retval < 0) {
2331                 ZFCP_LOG_INFO("error: Could not create open port request "
2332                               "for port 0x%016Lx on adapter %s.\n",
2333                               erp_action->port->wwpn,
2334                               zfcp_get_busid_by_adapter(erp_action->adapter));
2335                 goto out;
2336         }
2337
2338         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2339                                     erp_action->fsf_req->sbal_curr, 0);
2340         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2341         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2342
2343         erp_action->fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2344         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2345         erp_action->fsf_req->data = (unsigned long) erp_action->port;
2346         erp_action->fsf_req->erp_action = erp_action;
2347
2348         /* start QDIO request for this FSF request */
2349         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2350         if (retval) {
2351                 ZFCP_LOG_INFO("error: Could not send open port request for "
2352                               "port 0x%016Lx on adapter %s.\n",
2353                               erp_action->port->wwpn,
2354                               zfcp_get_busid_by_adapter(erp_action->adapter));
2355                 zfcp_fsf_req_free(erp_action->fsf_req);
2356                 erp_action->fsf_req = NULL;
2357                 goto out;
2358         }
2359
2360         ZFCP_LOG_DEBUG("open port request initiated "
2361                        "(adapter %s,  port 0x%016Lx)\n",
2362                        zfcp_get_busid_by_adapter(erp_action->adapter),
2363                        erp_action->port->wwpn);
2364  out:
2365         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2366                                 lock_flags);
2367         return retval;
2368 }
2369
2370 /*
2371  * function:    zfcp_fsf_open_port_handler
2372  *
2373  * purpose:     is called for finished Open Port command
2374  *
2375  * returns:
2376  */
2377 static int
2378 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2379 {
2380         int retval = -EINVAL;
2381         struct zfcp_port *port;
2382         struct fsf_plogi *plogi;
2383         struct fsf_qtcb_header *header;
2384         u16 subtable, rule, counter;
2385
2386         port = (struct zfcp_port *) fsf_req->data;
2387         header = &fsf_req->qtcb->header;
2388
2389         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2390                 /* don't change port status in our bookkeeping */
2391                 goto skip_fsfstatus;
2392         }
2393
2394         /* evaluate FSF status in QTCB */
2395         switch (header->fsf_status) {
2396
2397         case FSF_PORT_ALREADY_OPEN:
2398                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2399                                 "is already open.\n",
2400                                 port->wwpn, zfcp_get_busid_by_port(port));
2401                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2402                                      "fsf_s_popen");
2403                 /*
2404                  * This is a bug, however operation should continue normally
2405                  * if it is simply ignored
2406                  */
2407                 break;
2408
2409         case FSF_ACCESS_DENIED:
2410                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2411                                 "on adapter %s\n",
2412                                 port->wwpn, zfcp_get_busid_by_port(port));
2413                 for (counter = 0; counter < 2; counter++) {
2414                         subtable = header->fsf_status_qual.halfword[counter * 2];
2415                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2416                         switch (subtable) {
2417                         case FSF_SQ_CFDC_SUBTABLE_OS:
2418                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2419                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2420                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2421                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2422                                         zfcp_act_subtable_type[subtable], rule);
2423                                 break;
2424                         }
2425                 }
2426                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2427                 zfcp_erp_port_access_denied(port);
2428                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2429                 break;
2430
2431         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2432                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2433                               "The remote port 0x%016Lx on adapter %s "
2434                               "could not be opened. Disabling it.\n",
2435                               port->wwpn, zfcp_get_busid_by_port(port));
2436                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2437                                  "fsf_s_max_ports");
2438                 zfcp_erp_port_failed(port);
2439                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2440                 break;
2441
2442         case FSF_ADAPTER_STATUS_AVAILABLE:
2443                 switch (header->fsf_status_qual.word[0]) {
2444                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2445                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2446                                          "fsf_sq_ltest");
2447                         /* ERP strategy will escalate */
2448                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2449                         break;
2450                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2451                         /* ERP strategy will escalate */
2452                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2453                                          "fsf_sq_ulp");
2454                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2455                         break;
2456                 case FSF_SQ_NO_RETRY_POSSIBLE:
2457                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2458                                         "adapter %s could not be opened. "
2459                                         "Disabling it.\n",
2460                                         port->wwpn,
2461                                         zfcp_get_busid_by_port(port));
2462                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2463                                              "fsf_sq_no_retry");
2464                         zfcp_erp_port_failed(port);
2465                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2466                         break;
2467                 default:
2468                         ZFCP_LOG_NORMAL
2469                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2470                              header->fsf_status_qual.word[0]);
2471                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2472                                          "fsf_sq_inval:");
2473                         debug_exception(
2474                                 fsf_req->adapter->erp_dbf, 0,
2475                                 &header->fsf_status_qual.word[0],
2476                                 sizeof (u32));
2477                         break;
2478                 }
2479                 break;
2480
2481         case FSF_GOOD:
2482                 /* save port handle assigned by FSF */
2483                 port->handle = header->port_handle;
2484                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2485                               "was opened, it's port handle is 0x%x\n",
2486                               port->wwpn, zfcp_get_busid_by_port(port),
2487                               port->handle);
2488                 /* mark port as open */
2489                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2490                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2491                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2492                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2493                                   &port->status);
2494                 retval = 0;
2495                 /* check whether D_ID has changed during open */
2496                 /*
2497                  * FIXME: This check is not airtight, as the FCP channel does
2498                  * not monitor closures of target port connections caused on
2499                  * the remote side. Thus, they might miss out on invalidating
2500                  * locally cached WWPNs (and other N_Port parameters) of gone
2501                  * target ports. So, our heroic attempt to make things safe
2502                  * could be undermined by 'open port' response data tagged with
2503                  * obsolete WWPNs. Another reason to monitor potential
2504                  * connection closures ourself at least (by interpreting
2505                  * incoming ELS' and unsolicited status). It just crosses my
2506                  * mind that one should be able to cross-check by means of
2507                  * another GID_PN straight after a port has been opened.
2508                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2509                  */
2510                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2511                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2512                 {
2513                         if (fsf_req->qtcb->bottom.support.els1_length <
2514                             ((((unsigned long) &plogi->serv_param.wwpn) -
2515                               ((unsigned long) plogi)) + sizeof (u64))) {
2516                                 ZFCP_LOG_INFO(
2517                                         "warning: insufficient length of "
2518                                         "PLOGI payload (%i)\n",
2519                                         fsf_req->qtcb->bottom.support.els1_length);
2520                                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
2521                                                  "fsf_s_short_plogi:");
2522                                 /* skip sanity check and assume wwpn is ok */
2523                         } else {
2524                                 if (plogi->serv_param.wwpn != port->wwpn) {
2525                                         ZFCP_LOG_INFO("warning: d_id of port "
2526                                                       "0x%016Lx changed during "
2527                                                       "open\n", port->wwpn);
2528                                         debug_text_event(
2529                                                 fsf_req->adapter->erp_dbf, 0,
2530                                                 "fsf_s_did_change:");
2531                                         atomic_clear_mask(
2532                                                 ZFCP_STATUS_PORT_DID_DID,
2533                                                 &port->status);
2534                                 } else
2535                                         port->wwnn = plogi->serv_param.wwnn;
2536                         }
2537                 }
2538                 break;
2539
2540         case FSF_UNKNOWN_OP_SUBTYPE:
2541                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2542                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2543                               "op_subtype=0x%x)\n",
2544                               zfcp_get_busid_by_port(port),
2545                               fsf_req->qtcb->bottom.support.operation_subtype);
2546                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2547                 break;
2548
2549         default:
2550                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2551                                 "(debug info 0x%x)\n",
2552                                 header->fsf_status);
2553                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2554                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2555                                 &header->fsf_status, sizeof (u32));
2556                 break;
2557         }
2558
2559  skip_fsfstatus:
2560         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2561         return retval;
2562 }
2563
2564 /*
2565  * function:    zfcp_fsf_close_port
2566  *
2567  * purpose:     submit FSF command "close port"
2568  *
2569  * returns:     address of initiated FSF request
2570  *              NULL - request could not be initiated
2571  */
2572 int
2573 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2574 {
2575         volatile struct qdio_buffer_element *sbale;
2576         unsigned long lock_flags;
2577         int retval = 0;
2578
2579         /* setup new FSF request */
2580         retval = zfcp_fsf_req_create(erp_action->adapter,
2581                                      FSF_QTCB_CLOSE_PORT,
2582                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2583                                      erp_action->adapter->pool.fsf_req_erp,
2584                                      &lock_flags, &(erp_action->fsf_req));
2585         if (retval < 0) {
2586                 ZFCP_LOG_INFO("error: Could not create a close port request "
2587                               "for port 0x%016Lx on adapter %s.\n",
2588                               erp_action->port->wwpn,
2589                               zfcp_get_busid_by_adapter(erp_action->adapter));
2590                 goto out;
2591         }
2592
2593         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2594                                     erp_action->fsf_req->sbal_curr, 0);
2595         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2596         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2597
2598         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2599         erp_action->fsf_req->data = (unsigned long) erp_action->port;
2600         erp_action->fsf_req->erp_action = erp_action;
2601         erp_action->fsf_req->qtcb->header.port_handle =
2602             erp_action->port->handle;
2603
2604         /* start QDIO request for this FSF request */
2605         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2606         if (retval) {
2607                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2608                               "port 0x%016Lx on adapter %s.\n",
2609                               erp_action->port->wwpn,
2610                               zfcp_get_busid_by_adapter(erp_action->adapter));
2611                 zfcp_fsf_req_free(erp_action->fsf_req);
2612                 erp_action->fsf_req = NULL;
2613                 goto out;
2614         }
2615
2616         ZFCP_LOG_TRACE("close port request initiated "
2617                        "(adapter %s, port 0x%016Lx)\n",
2618                        zfcp_get_busid_by_adapter(erp_action->adapter),
2619                        erp_action->port->wwpn);
2620  out:
2621         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2622                                 lock_flags);
2623         return retval;
2624 }
2625
2626 /*
2627  * function:    zfcp_fsf_close_port_handler
2628  *
2629  * purpose:     is called for finished Close Port FSF command
2630  *
2631  * returns:
2632  */
2633 static int
2634 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2635 {
2636         int retval = -EINVAL;
2637         struct zfcp_port *port;
2638
2639         port = (struct zfcp_port *) fsf_req->data;
2640
2641         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2642                 /* don't change port status in our bookkeeping */
2643                 goto skip_fsfstatus;
2644         }
2645
2646         /* evaluate FSF status in QTCB */
2647         switch (fsf_req->qtcb->header.fsf_status) {
2648
2649         case FSF_PORT_HANDLE_NOT_VALID:
2650                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2651                               "0x%016Lx on adapter %s invalid. This may happen "
2652                               "occasionally.\n", port->handle,
2653                               port->wwpn, zfcp_get_busid_by_port(port));
2654                 ZFCP_LOG_DEBUG("status qualifier:\n");
2655                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2656                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2657                               sizeof (union fsf_status_qual));
2658                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2659                                  "fsf_s_phand_nv");
2660                 zfcp_erp_adapter_reopen(port->adapter, 0);
2661                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2662                 break;
2663
2664         case FSF_ADAPTER_STATUS_AVAILABLE:
2665                 /* Note: FSF has actually closed the port in this case.
2666                  * The status code is just daft. Fingers crossed for a change
2667                  */
2668                 retval = 0;
2669                 break;
2670
2671         case FSF_GOOD:
2672                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2673                                "port handle 0x%x\n", port->wwpn,
2674                                zfcp_get_busid_by_port(port), port->handle);
2675                 zfcp_erp_modify_port_status(port,
2676                                             ZFCP_STATUS_COMMON_OPEN,
2677                                             ZFCP_CLEAR);
2678                 retval = 0;
2679                 break;
2680
2681         default:
2682                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2683                                 "(debug info 0x%x)\n",
2684                                 fsf_req->qtcb->header.fsf_status);
2685                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2686                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2687                                 &fsf_req->qtcb->header.fsf_status,
2688                                 sizeof (u32));
2689                 break;
2690         }
2691
2692  skip_fsfstatus:
2693         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2694         return retval;
2695 }
2696
2697 /*
2698  * function:    zfcp_fsf_close_physical_port
2699  *
2700  * purpose:     submit FSF command "close physical port"
2701  *
2702  * returns:     address of initiated FSF request
2703  *              NULL - request could not be initiated
2704  */
2705 int
2706 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2707 {
2708         int retval = 0;
2709         unsigned long lock_flags;
2710         volatile struct qdio_buffer_element *sbale;
2711
2712         /* setup new FSF request */
2713         retval = zfcp_fsf_req_create(erp_action->adapter,
2714                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2715                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2716                                      erp_action->adapter->pool.fsf_req_erp,
2717                                      &lock_flags, &erp_action->fsf_req);
2718         if (retval < 0) {
2719                 ZFCP_LOG_INFO("error: Could not create close physical port "
2720                               "request (adapter %s, port 0x%016Lx)\n",
2721                               zfcp_get_busid_by_adapter(erp_action->adapter),
2722                               erp_action->port->wwpn);
2723
2724                 goto out;
2725         }
2726
2727         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2728                                     erp_action->fsf_req->sbal_curr, 0);
2729         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2730         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2731
2732         /* mark port as being closed */
2733         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2734                         &erp_action->port->status);
2735         /* save a pointer to this port */
2736         erp_action->fsf_req->data = (unsigned long) erp_action->port;
2737         /* port to be closed */
2738         erp_action->fsf_req->qtcb->header.port_handle =
2739             erp_action->port->handle;
2740         erp_action->fsf_req->erp_action = erp_action;
2741
2742         /* start QDIO request for this FSF request */
2743         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2744         if (retval) {
2745                 ZFCP_LOG_INFO("error: Could not send close physical port "
2746                               "request (adapter %s, port 0x%016Lx)\n",
2747                               zfcp_get_busid_by_adapter(erp_action->adapter),
2748                               erp_action->port->wwpn);
2749                 zfcp_fsf_req_free(erp_action->fsf_req);
2750                 erp_action->fsf_req = NULL;
2751                 goto out;
2752         }
2753
2754         ZFCP_LOG_TRACE("close physical port request initiated "
2755                        "(adapter %s, port 0x%016Lx)\n",
2756                        zfcp_get_busid_by_adapter(erp_action->adapter),
2757                        erp_action->port->wwpn);
2758  out:
2759         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2760                                 lock_flags);
2761         return retval;
2762 }
2763
2764 /*
2765  * function:    zfcp_fsf_close_physical_port_handler
2766  *
2767  * purpose:     is called for finished Close Physical Port FSF command
2768  *
2769  * returns:
2770  */
2771 static int
2772 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2773 {
2774         int retval = -EINVAL;
2775         struct zfcp_port *port;
2776         struct zfcp_unit *unit;
2777         struct fsf_qtcb_header *header;
2778         u16 subtable, rule, counter;
2779
2780         port = (struct zfcp_port *) fsf_req->data;
2781         header = &fsf_req->qtcb->header;
2782
2783         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2784                 /* don't change port status in our bookkeeping */
2785                 goto skip_fsfstatus;
2786         }
2787
2788         /* evaluate FSF status in QTCB */
2789         switch (header->fsf_status) {
2790
2791         case FSF_PORT_HANDLE_NOT_VALID:
2792                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2793                               "(adapter %s, port 0x%016Lx). "
2794                               "This may happen occasionally.\n",
2795                               port->handle,
2796                               zfcp_get_busid_by_port(port),
2797                               port->wwpn);
2798                 ZFCP_LOG_DEBUG("status qualifier:\n");
2799                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2800                               (char *) &header->fsf_status_qual,
2801                               sizeof (union fsf_status_qual));
2802                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2803                                  "fsf_s_phand_nv");
2804                 zfcp_erp_adapter_reopen(port->adapter, 0);
2805                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2806                 break;
2807
2808         case FSF_ACCESS_DENIED:
2809                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2810                                 "physical port 0x%016Lx on adapter %s\n",
2811                                 port->wwpn, zfcp_get_busid_by_port(port));
2812                 for (counter = 0; counter < 2; counter++) {
2813                         subtable = header->fsf_status_qual.halfword[counter * 2];
2814                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2815                         switch (subtable) {
2816                         case FSF_SQ_CFDC_SUBTABLE_OS:
2817                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2818                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2819                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2820                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2821                                         zfcp_act_subtable_type[subtable], rule);
2822                                 break;
2823                         }
2824                 }
2825                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2826                 zfcp_erp_port_access_denied(port);
2827                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2828                 break;
2829
2830         case FSF_PORT_BOXED:
2831                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2832                                "%s needs to be reopened but it was attempted "
2833                                "to close it physically.\n",
2834                                port->wwpn,
2835                                zfcp_get_busid_by_port(port));
2836                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_pboxed");
2837                 zfcp_erp_port_boxed(port);
2838                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2839                         ZFCP_STATUS_FSFREQ_RETRY;
2840                 break;
2841
2842         case FSF_ADAPTER_STATUS_AVAILABLE:
2843                 switch (header->fsf_status_qual.word[0]) {
2844                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2845                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2846                                          "fsf_sq_ltest");
2847                         /* This will now be escalated by ERP */
2848                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2849                         break;
2850                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2851                         /* ERP strategy will escalate */
2852                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2853                                          "fsf_sq_ulp");
2854                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2855                         break;
2856                 default:
2857                         ZFCP_LOG_NORMAL
2858                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2859                              header->fsf_status_qual.word[0]);
2860                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2861                                          "fsf_sq_inval:");
2862                         debug_exception(
2863                                 fsf_req->adapter->erp_dbf, 0,
2864                                 &header->fsf_status_qual.word[0], sizeof (u32));
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                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2888                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2889                                 &header->fsf_status, sizeof (u32));
2890                 break;
2891         }
2892
2893  skip_fsfstatus:
2894         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2895         return retval;
2896 }
2897
2898 /*
2899  * function:    zfcp_fsf_open_unit
2900  *
2901  * purpose:
2902  *
2903  * returns:
2904  *
2905  * assumptions: This routine does not check whether the associated
2906  *              remote port has already been opened. This should be
2907  *              done by calling routines. Otherwise some status
2908  *              may be presented by FSF
2909  */
2910 int
2911 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2912 {
2913         volatile struct qdio_buffer_element *sbale;
2914         unsigned long lock_flags;
2915         int retval = 0;
2916
2917         /* setup new FSF request */
2918         retval = zfcp_fsf_req_create(erp_action->adapter,
2919                                      FSF_QTCB_OPEN_LUN,
2920                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2921                                      erp_action->adapter->pool.fsf_req_erp,
2922                                      &lock_flags, &(erp_action->fsf_req));
2923         if (retval < 0) {
2924                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2925                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2926                               erp_action->unit->fcp_lun,
2927                               erp_action->unit->port->wwpn,
2928                               zfcp_get_busid_by_adapter(erp_action->adapter));
2929                 goto out;
2930         }
2931
2932         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2933                                     erp_action->fsf_req->sbal_curr, 0);
2934         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2935         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2936
2937         erp_action->fsf_req->qtcb->header.port_handle =
2938                 erp_action->port->handle;
2939         erp_action->fsf_req->qtcb->bottom.support.fcp_lun =
2940                 erp_action->unit->fcp_lun;
2941         if (!(erp_action->adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2942         erp_action->fsf_req->qtcb->bottom.support.option =
2943                 FSF_OPEN_LUN_SUPPRESS_BOXING;
2944         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2945         erp_action->fsf_req->data = (unsigned long) erp_action->unit;
2946         erp_action->fsf_req->erp_action = erp_action;
2947
2948         /* start QDIO request for this FSF request */
2949         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2950         if (retval) {
2951                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2952                               "on the adapter %s, port 0x%016Lx for "
2953                               "unit 0x%016Lx\n",
2954                               zfcp_get_busid_by_adapter(erp_action->adapter),
2955                               erp_action->port->wwpn,
2956                               erp_action->unit->fcp_lun);
2957                 zfcp_fsf_req_free(erp_action->fsf_req);
2958                 erp_action->fsf_req = NULL;
2959                 goto out;
2960         }
2961
2962         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2963                        "port 0x%016Lx, unit 0x%016Lx)\n",
2964                        zfcp_get_busid_by_adapter(erp_action->adapter),
2965                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2966  out:
2967         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2968                                 lock_flags);
2969         return retval;
2970 }
2971
2972 /*
2973  * function:    zfcp_fsf_open_unit_handler
2974  *
2975  * purpose:     is called for finished Open LUN command
2976  *
2977  * returns:
2978  */
2979 static int
2980 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2981 {
2982         int retval = -EINVAL;
2983         struct zfcp_adapter *adapter;
2984         struct zfcp_unit *unit;
2985         struct fsf_qtcb_header *header;
2986         struct fsf_qtcb_bottom_support *bottom;
2987         struct fsf_queue_designator *queue_designator;
2988         u16 subtable, rule, counter;
2989         int exclusive, readwrite;
2990
2991         unit = (struct zfcp_unit *) fsf_req->data;
2992
2993         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2994                 /* don't change unit status in our bookkeeping */
2995                 goto skip_fsfstatus;
2996         }
2997
2998         adapter = fsf_req->adapter;
2999         header = &fsf_req->qtcb->header;
3000         bottom = &fsf_req->qtcb->bottom.support;
3001         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
3002
3003         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
3004                           ZFCP_STATUS_UNIT_SHARED |
3005                           ZFCP_STATUS_UNIT_READONLY,
3006                           &unit->status);
3007
3008         /* evaluate FSF status in QTCB */
3009         switch (header->fsf_status) {
3010
3011         case FSF_PORT_HANDLE_NOT_VALID:
3012                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
3013                               "for port 0x%016Lx on adapter %s invalid "
3014                               "This may happen occasionally\n",
3015                               unit->port->handle,
3016                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3017                 ZFCP_LOG_DEBUG("status qualifier:\n");
3018                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3019                               (char *) &header->fsf_status_qual,
3020                               sizeof (union fsf_status_qual));
3021                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_ph_nv");
3022                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3023                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3024                 break;
3025
3026         case FSF_LUN_ALREADY_OPEN:
3027                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3028                                 "remote port 0x%016Lx on adapter %s twice.\n",
3029                                 unit->fcp_lun,
3030                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3031                 debug_text_exception(adapter->erp_dbf, 0,
3032                                      "fsf_s_uopen");
3033                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3034                 break;
3035
3036         case FSF_ACCESS_DENIED:
3037                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3038                                 "remote port 0x%016Lx on adapter %s\n",
3039                                 unit->fcp_lun, unit->port->wwpn,
3040                                 zfcp_get_busid_by_unit(unit));
3041                 for (counter = 0; counter < 2; counter++) {
3042                         subtable = header->fsf_status_qual.halfword[counter * 2];
3043                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3044                         switch (subtable) {
3045                         case FSF_SQ_CFDC_SUBTABLE_OS:
3046                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3047                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3048                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3049                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3050                                         zfcp_act_subtable_type[subtable], rule);
3051                                 break;
3052                         }
3053                 }
3054                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
3055                 zfcp_erp_unit_access_denied(unit);
3056                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3057                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3058                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3059                 break;
3060
3061         case FSF_PORT_BOXED:
3062                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3063                                "needs to be reopened\n",
3064                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3065                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
3066                 zfcp_erp_port_boxed(unit->port);
3067                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3068                         ZFCP_STATUS_FSFREQ_RETRY;
3069                 break;
3070
3071         case FSF_LUN_SHARING_VIOLATION:
3072                 if (header->fsf_status_qual.word[0] != 0) {
3073                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3074                                         "with WWPN 0x%Lx "
3075                                         "connected to the adapter %s "
3076                                         "is already in use in LPAR%d, CSS%d\n",
3077                                         unit->fcp_lun,
3078                                         unit->port->wwpn,
3079                                         zfcp_get_busid_by_unit(unit),
3080                                         queue_designator->hla,
3081                                         queue_designator->cssid);
3082                 } else {
3083                         subtable = header->fsf_status_qual.halfword[4];
3084                         rule = header->fsf_status_qual.halfword[5];
3085                         switch (subtable) {
3086                         case FSF_SQ_CFDC_SUBTABLE_OS:
3087                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3088                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3089                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3090                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3091                                                 "remote port with WWPN 0x%Lx "
3092                                                 "connected to the adapter %s "
3093                                                 "is denied (%s rule %d)\n",
3094                                                 unit->fcp_lun,
3095                                                 unit->port->wwpn,
3096                                                 zfcp_get_busid_by_unit(unit),
3097                                                 zfcp_act_subtable_type[subtable],
3098                                                 rule);
3099                                 break;
3100                         }
3101                 }
3102                 ZFCP_LOG_DEBUG("status qualifier:\n");
3103                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3104                               (char *) &header->fsf_status_qual,
3105                               sizeof (union fsf_status_qual));
3106                 debug_text_event(adapter->erp_dbf, 2,
3107                                  "fsf_s_l_sh_vio");
3108                 zfcp_erp_unit_access_denied(unit);
3109                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3110                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3111                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3112                 break;
3113
3114         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3115                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3116                               "There is no handle (temporary port identifier) "
3117                               "available for unit 0x%016Lx on port 0x%016Lx "
3118                               "on adapter %s\n",
3119                               unit->fcp_lun,
3120                               unit->port->wwpn,
3121                               zfcp_get_busid_by_unit(unit));
3122                 debug_text_event(adapter->erp_dbf, 1,
3123                                  "fsf_s_max_units");
3124                 zfcp_erp_unit_failed(unit);
3125                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3126                 break;
3127
3128         case FSF_ADAPTER_STATUS_AVAILABLE:
3129                 switch (header->fsf_status_qual.word[0]) {
3130                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3131                         /* Re-establish link to port */
3132                         debug_text_event(adapter->erp_dbf, 1,
3133                                          "fsf_sq_ltest");
3134                         zfcp_test_link(unit->port);
3135                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3136                         break;
3137                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3138                         /* ERP strategy will escalate */
3139                         debug_text_event(adapter->erp_dbf, 1,
3140                                          "fsf_sq_ulp");
3141                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3142                         break;
3143                 default:
3144                         ZFCP_LOG_NORMAL
3145                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3146                              header->fsf_status_qual.word[0]);
3147                         debug_text_event(adapter->erp_dbf, 0,
3148                                          "fsf_sq_inval:");
3149                         debug_exception(adapter->erp_dbf, 0,
3150                                         &header->fsf_status_qual.word[0],
3151                                 sizeof (u32));
3152                 }
3153                 break;
3154
3155         case FSF_INVALID_COMMAND_OPTION:
3156                 ZFCP_LOG_NORMAL(
3157                         "Invalid option 0x%x has been specified "
3158                         "in QTCB bottom sent to the adapter %s\n",
3159                         bottom->option,
3160                         zfcp_get_busid_by_adapter(adapter));
3161                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3162                 retval = -EINVAL;
3163                 break;
3164
3165         case FSF_GOOD:
3166                 /* save LUN handle assigned by FSF */
3167                 unit->handle = header->lun_handle;
3168                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3169                                "adapter %s opened, port handle 0x%x\n",
3170                                unit->fcp_lun,
3171                                unit->port->wwpn,
3172                                zfcp_get_busid_by_unit(unit),
3173                                unit->handle);
3174                 /* mark unit as open */
3175                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3176
3177                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
3178                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
3179                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
3180                         exclusive = (bottom->lun_access_info &
3181                                         FSF_UNIT_ACCESS_EXCLUSIVE);
3182                         readwrite = (bottom->lun_access_info &
3183                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
3184
3185                         if (!exclusive)
3186                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3187                                                 &unit->status);
3188
3189                         if (!readwrite) {
3190                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3191                                                 &unit->status);
3192                                 ZFCP_LOG_NORMAL("read-only access for unit "
3193                                                 "(adapter %s, wwpn=0x%016Lx, "
3194                                                 "fcp_lun=0x%016Lx)\n",
3195                                                 zfcp_get_busid_by_unit(unit),
3196                                                 unit->port->wwpn,
3197                                                 unit->fcp_lun);
3198                         }
3199
3200                         if (exclusive && !readwrite) {
3201                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3202                                                 "unit not supported\n");
3203                                 zfcp_erp_unit_failed(unit);
3204                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3205                                 zfcp_erp_unit_shutdown(unit, 0);
3206                         } else if (!exclusive && readwrite) {
3207                                 ZFCP_LOG_NORMAL("shared access of read-write "
3208                                                 "unit not supported\n");
3209                                 zfcp_erp_unit_failed(unit);
3210                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3211                                 zfcp_erp_unit_shutdown(unit, 0);
3212                         }
3213                 }
3214
3215                 retval = 0;
3216                 break;
3217
3218         default:
3219                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3220                                 "(debug info 0x%x)\n",
3221                                 header->fsf_status);
3222                 debug_text_event(adapter->erp_dbf, 0, "fsf_s_inval:");
3223                 debug_exception(adapter->erp_dbf, 0,
3224                                 &header->fsf_status, sizeof (u32));
3225                 break;
3226         }
3227
3228  skip_fsfstatus:
3229         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3230         return retval;
3231 }
3232
3233 /*
3234  * function:    zfcp_fsf_close_unit
3235  *
3236  * purpose:
3237  *
3238  * returns:     address of fsf_req - request successfully initiated
3239  *              NULL -
3240  *
3241  * assumptions: This routine does not check whether the associated
3242  *              remote port/lun has already been opened. This should be
3243  *              done by calling routines. Otherwise some status
3244  *              may be presented by FSF
3245  */
3246 int
3247 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3248 {
3249         volatile struct qdio_buffer_element *sbale;
3250         unsigned long lock_flags;
3251         int retval = 0;
3252
3253         /* setup new FSF request */
3254         retval = zfcp_fsf_req_create(erp_action->adapter,
3255                                      FSF_QTCB_CLOSE_LUN,
3256                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3257                                      erp_action->adapter->pool.fsf_req_erp,
3258                                      &lock_flags, &(erp_action->fsf_req));
3259         if (retval < 0) {
3260                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3261                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3262                               erp_action->unit->fcp_lun,
3263                               erp_action->port->wwpn,
3264                               zfcp_get_busid_by_adapter(erp_action->adapter));
3265                 goto out;
3266         }
3267
3268         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
3269                                     erp_action->fsf_req->sbal_curr, 0);
3270         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3271         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3272
3273         erp_action->fsf_req->qtcb->header.port_handle =
3274             erp_action->port->handle;
3275         erp_action->fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3276         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3277         erp_action->fsf_req->data = (unsigned long) erp_action->unit;
3278         erp_action->fsf_req->erp_action = erp_action;
3279
3280         /* start QDIO request for this FSF request */
3281         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
3282         if (retval) {
3283                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3284                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3285                               erp_action->unit->fcp_lun,
3286                               erp_action->port->wwpn,
3287                               zfcp_get_busid_by_adapter(erp_action->adapter));
3288                 zfcp_fsf_req_free(erp_action->fsf_req);
3289                 erp_action->fsf_req = NULL;
3290                 goto out;
3291         }
3292
3293         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3294                        "port 0x%016Lx, unit 0x%016Lx)\n",
3295                        zfcp_get_busid_by_adapter(erp_action->adapter),
3296                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3297  out:
3298         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3299                                 lock_flags);
3300         return retval;
3301 }
3302
3303 /*
3304  * function:    zfcp_fsf_close_unit_handler
3305  *
3306  * purpose:     is called for finished Close LUN FSF command
3307  *
3308  * returns:
3309  */
3310 static int
3311 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3312 {
3313         int retval = -EINVAL;
3314         struct zfcp_unit *unit;
3315
3316         unit = (struct zfcp_unit *) fsf_req->data;
3317
3318         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3319                 /* don't change unit status in our bookkeeping */
3320                 goto skip_fsfstatus;
3321         }
3322
3323         /* evaluate FSF status in QTCB */
3324         switch (fsf_req->qtcb->header.fsf_status) {
3325
3326         case FSF_PORT_HANDLE_NOT_VALID:
3327                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3328                               "0x%016Lx on adapter %s invalid. This may "
3329                               "happen in rare circumstances\n",
3330                               unit->port->handle,
3331                               unit->port->wwpn,
3332                               zfcp_get_busid_by_unit(unit));
3333                 ZFCP_LOG_DEBUG("status qualifier:\n");
3334                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3335                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3336                               sizeof (union fsf_status_qual));
3337                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3338                                  "fsf_s_phand_nv");
3339                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3340                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3341                 break;
3342
3343         case FSF_LUN_HANDLE_NOT_VALID:
3344                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3345                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3346                               "invalid. This may happen occasionally.\n",
3347                               unit->handle,
3348                               unit->fcp_lun,
3349                               unit->port->wwpn,
3350                               zfcp_get_busid_by_unit(unit));
3351                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3352                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3353                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3354                               sizeof (union fsf_status_qual));
3355                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3356                                  "fsf_s_lhand_nv");
3357                 zfcp_erp_port_reopen(unit->port, 0);
3358                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3359                 break;
3360
3361         case FSF_PORT_BOXED:
3362                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3363                                "needs to be reopened\n",
3364                                unit->port->wwpn,
3365                                zfcp_get_busid_by_unit(unit));
3366                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3367                 zfcp_erp_port_boxed(unit->port);
3368                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3369                         ZFCP_STATUS_FSFREQ_RETRY;
3370                 break;
3371
3372         case FSF_ADAPTER_STATUS_AVAILABLE:
3373                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3374                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3375                         /* re-establish link to port */
3376                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3377                                          "fsf_sq_ltest");
3378                         zfcp_test_link(unit->port);
3379                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3380                         break;
3381                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3382                         /* ERP strategy will escalate */
3383                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3384                                          "fsf_sq_ulp");
3385                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3386                         break;
3387                 default:
3388                         ZFCP_LOG_NORMAL
3389                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3390                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3391                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3392                                          "fsf_sq_inval:");
3393                         debug_exception(
3394                                 fsf_req->adapter->erp_dbf, 0,
3395                                 &fsf_req->qtcb->header.fsf_status_qual.word[0],
3396                                 sizeof (u32));
3397                         break;
3398                 }
3399                 break;
3400
3401         case FSF_GOOD:
3402                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3403                                "closed, port handle 0x%x\n",
3404                                unit->fcp_lun,
3405                                unit->port->wwpn,
3406                                zfcp_get_busid_by_unit(unit),
3407                                unit->handle);
3408                 /* mark unit as closed */
3409                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3410                 retval = 0;
3411                 break;
3412
3413         default:
3414                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3415                                 "(debug info 0x%x)\n",
3416                                 fsf_req->qtcb->header.fsf_status);
3417                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3418                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3419                                 &fsf_req->qtcb->header.fsf_status,
3420                                 sizeof (u32));
3421                 break;
3422         }
3423
3424  skip_fsfstatus:
3425         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3426         return retval;
3427 }
3428
3429 /**
3430  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3431  * @adapter: adapter where scsi command is issued
3432  * @unit: unit where command is sent to
3433  * @scsi_cmnd: scsi command to be sent
3434  * @timer: timer to be started when request is initiated
3435  * @req_flags: flags for fsf_request
3436  */
3437 int
3438 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3439                                struct zfcp_unit *unit,
3440                                struct scsi_cmnd * scsi_cmnd,
3441                                struct timer_list *timer, int req_flags)
3442 {
3443         struct zfcp_fsf_req *fsf_req = NULL;
3444         struct fcp_cmnd_iu *fcp_cmnd_iu;
3445         unsigned int sbtype;
3446         unsigned long lock_flags;
3447         int real_bytes = 0;
3448         int retval = 0;
3449         int mask;
3450
3451         /* setup new FSF request */
3452         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3453                                      adapter->pool.fsf_req_scsi,
3454                                      &lock_flags, &fsf_req);
3455         if (unlikely(retval < 0)) {
3456                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3457                                "for unit 0x%016Lx on port 0x%016Lx on "
3458                                "adapter %s\n",
3459                                unit->fcp_lun,
3460                                unit->port->wwpn,
3461                                zfcp_get_busid_by_adapter(adapter));
3462                 goto failed_req_create;
3463         }
3464
3465         zfcp_unit_get(unit);
3466         fsf_req->unit = unit;
3467
3468         /* associate FSF request with SCSI request (for look up on abort) */
3469         scsi_cmnd->host_scribble = (char *) fsf_req;
3470
3471         /* associate SCSI command with FSF request */
3472         fsf_req->data = (unsigned long) scsi_cmnd;
3473
3474         /* set handles of unit and its parent port in QTCB */
3475         fsf_req->qtcb->header.lun_handle = unit->handle;
3476         fsf_req->qtcb->header.port_handle = unit->port->handle;
3477
3478         /* FSF does not define the structure of the FCP_CMND IU */
3479         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3480             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3481
3482         /*
3483          * set depending on data direction:
3484          *      data direction bits in SBALE (SB Type)
3485          *      data direction bits in QTCB
3486          *      data direction bits in FCP_CMND IU
3487          */
3488         switch (scsi_cmnd->sc_data_direction) {
3489         case DMA_NONE:
3490                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3491                 /*
3492                  * FIXME(qdio):
3493                  * what is the correct type for commands
3494                  * without 'real' data buffers?
3495                  */
3496                 sbtype = SBAL_FLAGS0_TYPE_READ;
3497                 break;
3498         case DMA_FROM_DEVICE:
3499                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3500                 sbtype = SBAL_FLAGS0_TYPE_READ;
3501                 fcp_cmnd_iu->rddata = 1;
3502                 break;
3503         case DMA_TO_DEVICE:
3504                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3505                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3506                 fcp_cmnd_iu->wddata = 1;
3507                 break;
3508         case DMA_BIDIRECTIONAL:
3509         default:
3510                 /*
3511                  * dummy, catch this condition earlier
3512                  * in zfcp_scsi_queuecommand
3513                  */
3514                 goto failed_scsi_cmnd;
3515         }
3516
3517         /* set FC service class in QTCB (3 per default) */
3518         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3519
3520         /* set FCP_LUN in FCP_CMND IU in QTCB */
3521         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3522
3523         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3524
3525         /* set task attributes in FCP_CMND IU in QTCB */
3526         if (likely((scsi_cmnd->device->simple_tags) ||
3527                    (atomic_test_mask(mask, &unit->status))))
3528                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3529         else
3530                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3531
3532         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3533         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3534                 fcp_cmnd_iu->add_fcp_cdb_length
3535                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3536                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3537                                "additional FCP_CDB length is 0x%x "
3538                                "(shifted right 2 bits)\n",
3539                                scsi_cmnd->cmd_len,
3540                                fcp_cmnd_iu->add_fcp_cdb_length);
3541         }
3542         /*
3543          * copy SCSI CDB (including additional length, if any) to
3544          * FCP_CDB in FCP_CMND IU in QTCB
3545          */
3546         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3547
3548         /* FCP CMND IU length in QTCB */
3549         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3550                 sizeof (struct fcp_cmnd_iu) +
3551                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3552
3553         /* generate SBALEs from data buffer */
3554         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3555         if (unlikely(real_bytes < 0)) {
3556                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3557                         ZFCP_LOG_DEBUG(
3558                                 "Data did not fit into available buffer(s), "
3559                                "waiting for more...\n");
3560                 retval = -EIO;
3561         } else {
3562                 ZFCP_LOG_NORMAL("error: No truncation implemented but "
3563                                 "required. Shutting down unit "
3564                                 "(adapter %s, port 0x%016Lx, "
3565                                 "unit 0x%016Lx)\n",
3566                                 zfcp_get_busid_by_unit(unit),
3567                                 unit->port->wwpn,
3568                                 unit->fcp_lun);
3569                 zfcp_erp_unit_shutdown(unit, 0);
3570                 retval = -EINVAL;
3571                 }
3572                 goto no_fit;
3573         }
3574
3575         /* set length of FCP data length in FCP_CMND IU in QTCB */
3576         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3577
3578         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3579         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3580                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3581
3582         /*
3583          * start QDIO request for this FSF request
3584          *  covered by an SBALE)
3585          */
3586         retval = zfcp_fsf_req_send(fsf_req, timer);
3587         if (unlikely(retval < 0)) {
3588                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3589                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3590                               zfcp_get_busid_by_adapter(adapter),
3591                               unit->port->wwpn,
3592                               unit->fcp_lun);
3593                 goto send_failed;
3594         }
3595
3596         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3597                        "port 0x%016Lx, unit 0x%016Lx)\n",
3598                        zfcp_get_busid_by_adapter(adapter),
3599                        unit->port->wwpn,
3600                        unit->fcp_lun);
3601         goto success;
3602
3603  send_failed:
3604  no_fit:
3605  failed_scsi_cmnd:
3606         zfcp_unit_put(unit);
3607         zfcp_fsf_req_free(fsf_req);
3608         fsf_req = NULL;
3609         scsi_cmnd->host_scribble = NULL;
3610  success:
3611  failed_req_create:
3612         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3613         return retval;
3614 }
3615
3616 /*
3617  * function:    zfcp_fsf_send_fcp_command_task_management
3618  *
3619  * purpose:
3620  *
3621  * returns:
3622  *
3623  * FIXME(design): should be watched by a timeout!!!
3624  * FIXME(design) shouldn't this be modified to return an int
3625  *               also...don't know how though
3626  *
3627  */
3628 struct zfcp_fsf_req *
3629 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3630                                           struct zfcp_unit *unit,
3631                                           u8 tm_flags, int req_flags)
3632 {
3633         struct zfcp_fsf_req *fsf_req = NULL;
3634         int retval = 0;
3635         struct fcp_cmnd_iu *fcp_cmnd_iu;
3636         unsigned long lock_flags;
3637         volatile struct qdio_buffer_element *sbale;
3638
3639         /* setup new FSF request */
3640         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3641                                      adapter->pool.fsf_req_scsi,
3642                                      &lock_flags, &fsf_req);
3643         if (retval < 0) {
3644                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3645                               "management) request for adapter %s, port "
3646                               " 0x%016Lx, unit 0x%016Lx.\n",
3647                               zfcp_get_busid_by_adapter(adapter),
3648                               unit->port->wwpn, unit->fcp_lun);
3649                 goto out;
3650         }
3651
3652         /*
3653          * Used to decide on proper handler in the return path,
3654          * could be either zfcp_fsf_send_fcp_command_task_handler or
3655          * zfcp_fsf_send_fcp_command_task_management_handler */
3656
3657         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3658
3659         /*
3660          * hold a pointer to the unit being target of this
3661          * task management request
3662          */
3663         fsf_req->data = (unsigned long) unit;
3664
3665         /* set FSF related fields in QTCB */
3666         fsf_req->qtcb->header.lun_handle = unit->handle;
3667         fsf_req->qtcb->header.port_handle = unit->port->handle;
3668         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3669         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3670         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3671                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3672
3673         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3674         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3675         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3676
3677         /* set FCP related fields in FCP_CMND IU in QTCB */
3678         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3679                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3680         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3681         fcp_cmnd_iu->task_management_flags = tm_flags;
3682
3683         /* start QDIO request for this FSF request */
3684         zfcp_fsf_start_scsi_er_timer(adapter);
3685         retval = zfcp_fsf_req_send(fsf_req, NULL);
3686         if (retval) {
3687                 del_timer(&adapter->scsi_er_timer);
3688                 ZFCP_LOG_INFO("error: Could not send an FCP-command (task "
3689                               "management) on adapter %s, port 0x%016Lx for "
3690                               "unit LUN 0x%016Lx\n",
3691                               zfcp_get_busid_by_adapter(adapter),
3692                               unit->port->wwpn,
3693                               unit->fcp_lun);
3694                 zfcp_fsf_req_free(fsf_req);
3695                 fsf_req = NULL;
3696                 goto out;
3697         }
3698
3699         ZFCP_LOG_TRACE("Send FCP Command (task management function) initiated "
3700                        "(adapter %s, port 0x%016Lx, unit 0x%016Lx, "
3701                        "tm_flags=0x%x)\n",
3702                        zfcp_get_busid_by_adapter(adapter),
3703                        unit->port->wwpn,
3704                        unit->fcp_lun,
3705                        tm_flags);
3706  out:
3707         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3708         return fsf_req;
3709 }
3710
3711 /*
3712  * function:    zfcp_fsf_send_fcp_command_handler
3713  *
3714  * purpose:     is called for finished Send FCP Command
3715  *
3716  * returns:
3717  */
3718 static int
3719 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3720 {
3721         int retval = -EINVAL;
3722         struct zfcp_unit *unit;
3723         struct fsf_qtcb_header *header;
3724         u16 subtable, rule, counter;
3725
3726         header = &fsf_req->qtcb->header;
3727
3728         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3729                 unit = (struct zfcp_unit *) fsf_req->data;
3730         else
3731                 unit = fsf_req->unit;
3732
3733         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3734                 /* go directly to calls of special handlers */
3735                 goto skip_fsfstatus;
3736         }
3737
3738         /* evaluate FSF status in QTCB */
3739         switch (header->fsf_status) {
3740
3741         case FSF_PORT_HANDLE_NOT_VALID:
3742                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3743                               "0x%016Lx on adapter %s invalid\n",
3744                               unit->port->handle,
3745                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3746                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3747                               (char *) &header->fsf_status_qual,
3748                               sizeof (union fsf_status_qual));
3749                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3750                                  "fsf_s_phand_nv");
3751                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3752                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3753                 break;
3754
3755         case FSF_LUN_HANDLE_NOT_VALID:
3756                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3757                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3758                               "invalid. This may happen occasionally.\n",
3759                               unit->handle,
3760                               unit->fcp_lun,
3761                               unit->port->wwpn,
3762                               zfcp_get_busid_by_unit(unit));
3763                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3764                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3765                               (char *) &header->fsf_status_qual,
3766                               sizeof (union fsf_status_qual));
3767                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3768                                  "fsf_s_uhand_nv");
3769                 zfcp_erp_port_reopen(unit->port, 0);
3770                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3771                 break;
3772
3773         case FSF_HANDLE_MISMATCH:
3774                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3775                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3776                                 "unit 0x%016Lx)\n",
3777                                 unit->port->handle,
3778                                 zfcp_get_busid_by_unit(unit),
3779                                 unit->port->wwpn,
3780                                 unit->fcp_lun);
3781                 ZFCP_LOG_NORMAL("status qualifier:\n");
3782                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3783                               (char *) &header->fsf_status_qual,
3784                               sizeof (union fsf_status_qual));
3785                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3786                                  "fsf_s_hand_mis");
3787                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3788                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3789                 break;
3790
3791         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3792                 if (fsf_req->adapter->fc_service_class <= 3) {
3793                         ZFCP_LOG_NORMAL("error: The adapter %s does "
3794                                         "not support fibrechannel class %d.\n",
3795                                         zfcp_get_busid_by_unit(unit),
3796                                         fsf_req->adapter->fc_service_class);
3797                 } else {
3798                         ZFCP_LOG_NORMAL("bug: The fibrechannel class at "
3799                                         "adapter %s is invalid. "
3800                                         "(debug info %d)\n",
3801                                         zfcp_get_busid_by_unit(unit),
3802                                         fsf_req->adapter->fc_service_class);
3803                 }
3804                 /* stop operation for this adapter */
3805                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
3806                                      "fsf_s_class_nsup");
3807                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3808                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3809                 break;
3810
3811         case FSF_FCPLUN_NOT_VALID:
3812                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3813                                 "adapter %s does not have correct unit "
3814                                 "handle 0x%x\n",
3815                                 unit->fcp_lun,
3816                                 unit->port->wwpn,
3817                                 zfcp_get_busid_by_unit(unit),
3818                                 unit->handle);
3819                 ZFCP_LOG_DEBUG("status qualifier:\n");
3820                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3821                               (char *) &header->fsf_status_qual,
3822                               sizeof (union fsf_status_qual));
3823                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3824                                  "fsf_s_fcp_lun_nv");
3825                 zfcp_erp_port_reopen(unit->port, 0);
3826                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3827                 break;
3828
3829         case FSF_ACCESS_DENIED:
3830                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3831                                 "unit 0x%016Lx on port 0x%016Lx on "
3832                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3833                                 zfcp_get_busid_by_unit(unit));
3834                 for (counter = 0; counter < 2; counter++) {
3835                         subtable = header->fsf_status_qual.halfword[counter * 2];
3836                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3837                         switch (subtable) {
3838                         case FSF_SQ_CFDC_SUBTABLE_OS:
3839                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3840                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3841                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3842                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3843                                         zfcp_act_subtable_type[subtable], rule);
3844                                 break;
3845                         }
3846                 }
3847                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
3848                 zfcp_erp_unit_access_denied(unit);
3849                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3850                 break;
3851
3852         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3853                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3854                               "0x%016Lx on port 0x%016Lx on adapter %s "
3855                               "(debug info %d)\n",
3856                               unit->fcp_lun,
3857                               unit->port->wwpn,
3858                               zfcp_get_busid_by_unit(unit),
3859                               fsf_req->qtcb->bottom.io.data_direction);
3860                 /* stop operation for this adapter */
3861                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3862                                  "fsf_s_dir_ind_nv");
3863                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3864                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3865                 break;
3866
3867         case FSF_CMND_LENGTH_NOT_VALID:
3868                 ZFCP_LOG_NORMAL
3869                     ("bug: An invalid control-data-block length field "
3870                      "was found in a command for unit 0x%016Lx on port "
3871                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3872                      unit->fcp_lun, unit->port->wwpn,
3873                      zfcp_get_busid_by_unit(unit),
3874                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3875                 /* stop operation for this adapter */
3876                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3877                                  "fsf_s_cmd_len_nv");
3878                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3879                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3880                 break;
3881
3882         case FSF_PORT_BOXED:
3883                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3884                                "needs to be reopened\n",
3885                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3886                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3887                 zfcp_erp_port_boxed(unit->port);
3888                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3889                         ZFCP_STATUS_FSFREQ_RETRY;
3890                 break;
3891
3892         case FSF_LUN_BOXED:
3893                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3894                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3895                                 zfcp_get_busid_by_unit(unit),
3896                                 unit->port->wwpn, unit->fcp_lun);
3897                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
3898                 zfcp_erp_unit_boxed(unit);
3899                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3900                         | ZFCP_STATUS_FSFREQ_RETRY;
3901                 break;
3902
3903         case FSF_ADAPTER_STATUS_AVAILABLE:
3904                 switch (header->fsf_status_qual.word[0]) {
3905                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3906                         /* re-establish link to port */
3907                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3908                                          "fsf_sq_ltest");
3909                         zfcp_test_link(unit->port);
3910                         break;
3911                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3912                         /* FIXME(hw) need proper specs for proper action */
3913                         /* let scsi stack deal with retries and escalation */
3914                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3915                                          "fsf_sq_ulp");
3916                         break;
3917                 default:
3918                         ZFCP_LOG_NORMAL
3919                             ("Unknown status qualifier 0x%x arrived.\n",
3920                              header->fsf_status_qual.word[0]);
3921                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3922                                          "fsf_sq_inval:");
3923                         debug_exception(fsf_req->adapter->erp_dbf, 0,
3924                                         &header->fsf_status_qual.word[0],
3925                                         sizeof(u32));
3926                         break;
3927                 }
3928                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3929                 break;
3930
3931         case FSF_GOOD:
3932                 break;
3933
3934         case FSF_FCP_RSP_AVAILABLE:
3935                 break;
3936
3937         default:
3938                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3939                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3940                                 &header->fsf_status, sizeof(u32));
3941                 break;
3942         }
3943
3944  skip_fsfstatus:
3945         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3946                 retval =
3947                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3948         } else {
3949                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3950                 fsf_req->unit = NULL;
3951                 zfcp_unit_put(unit);
3952         }
3953         return retval;
3954 }
3955
3956 /*
3957  * function:    zfcp_fsf_send_fcp_command_task_handler
3958  *
3959  * purpose:     evaluates FCP_RSP IU
3960  *
3961  * returns:
3962  */
3963 static int
3964 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3965 {
3966         int retval = 0;
3967         struct scsi_cmnd *scpnt;
3968         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3969             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3970         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3971             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3972         u32 sns_len;
3973         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3974         unsigned long flags;
3975         struct zfcp_unit *unit = fsf_req->unit;
3976
3977         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3978         scpnt = (struct scsi_cmnd *) fsf_req->data;
3979         if (unlikely(!scpnt)) {
3980                 ZFCP_LOG_DEBUG
3981                     ("Command with fsf_req %p is not associated to "
3982                      "a scsi command anymore. Aborted?\n", fsf_req);
3983                 goto out;
3984         }
3985         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3986                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3987                  *        DID_SOFT_ERROR by retrying the request for devices
3988                  *        that allow retries.
3989                  */
3990                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3991                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3992                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3993                 goto skip_fsfstatus;
3994         }
3995
3996         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3997                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3998                 set_host_byte(&scpnt->result, DID_ERROR);
3999                 goto skip_fsfstatus;
4000         }
4001
4002         /* set message byte of result in SCSI command */
4003         scpnt->result |= COMMAND_COMPLETE << 8;
4004
4005         /*
4006          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
4007          * of result in SCSI command
4008          */
4009         scpnt->result |= fcp_rsp_iu->scsi_status;
4010         if (unlikely(fcp_rsp_iu->scsi_status)) {
4011                 /* DEBUG */
4012                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
4013                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4014                               scpnt->cmnd, scpnt->cmd_len);
4015                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
4016                                 fcp_rsp_iu->scsi_status);
4017                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4018                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
4019                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4020                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
4021                               fcp_rsp_iu->fcp_sns_len);
4022         }
4023
4024         /* check FCP_RSP_INFO */
4025         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
4026                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
4027                 switch (fcp_rsp_info[3]) {
4028                 case RSP_CODE_GOOD:
4029                         /* ok, continue */
4030                         ZFCP_LOG_TRACE("no failure or Task Management "
4031                                        "Function complete\n");
4032                         set_host_byte(&scpnt->result, DID_OK);
4033                         break;
4034                 case RSP_CODE_LENGTH_MISMATCH:
4035                         /* hardware bug */
4036                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4037                                         "that the fibrechannel protocol data "
4038                                         "length differs from the burst length. "
4039                                         "The problem occured on unit 0x%016Lx "
4040                                         "on port 0x%016Lx on adapter %s",
4041                                         unit->fcp_lun,
4042                                         unit->port->wwpn,
4043                                         zfcp_get_busid_by_unit(unit));
4044                         /* dump SCSI CDB as prepared by zfcp */
4045                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4046                                       (char *) &fsf_req->qtcb->
4047                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4048                         set_host_byte(&scpnt->result, DID_ERROR);
4049                         goto skip_fsfstatus;
4050                 case RSP_CODE_FIELD_INVALID:
4051                         /* driver or hardware bug */
4052                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4053                                         "that the fibrechannel protocol data "
4054                                         "fields were incorrectly set up. "
4055                                         "The problem occured on the unit "
4056                                         "0x%016Lx on port 0x%016Lx on "
4057                                         "adapter %s",
4058                                         unit->fcp_lun,
4059                                         unit->port->wwpn,
4060                                         zfcp_get_busid_by_unit(unit));
4061                         /* dump SCSI CDB as prepared by zfcp */
4062                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4063                                       (char *) &fsf_req->qtcb->
4064                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4065                         set_host_byte(&scpnt->result, DID_ERROR);
4066                         goto skip_fsfstatus;
4067                 case RSP_CODE_RO_MISMATCH:
4068                         /* hardware bug */
4069                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
4070                                         "that conflicting  values for the "
4071                                         "fibrechannel payload offset from the "
4072                                         "header were found. "
4073                                         "The problem occured on unit 0x%016Lx "
4074                                         "on port 0x%016Lx on adapter %s.\n",
4075                                         unit->fcp_lun,
4076                                         unit->port->wwpn,
4077                                         zfcp_get_busid_by_unit(unit));
4078                         /* dump SCSI CDB as prepared by zfcp */
4079                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4080                                       (char *) &fsf_req->qtcb->
4081                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4082                         set_host_byte(&scpnt->result, DID_ERROR);
4083                         goto skip_fsfstatus;
4084                 default:
4085                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4086                                         "code was detected for a command. "
4087                                         "The problem occured on the unit "
4088                                         "0x%016Lx on port 0x%016Lx on "
4089                                         "adapter %s (debug info 0x%x)\n",
4090                                         unit->fcp_lun,
4091                                         unit->port->wwpn,
4092                                         zfcp_get_busid_by_unit(unit),
4093                                         fcp_rsp_info[3]);
4094                         /* dump SCSI CDB as prepared by zfcp */
4095                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4096                                       (char *) &fsf_req->qtcb->
4097                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4098                         set_host_byte(&scpnt->result, DID_ERROR);
4099                         goto skip_fsfstatus;
4100                 }
4101         }
4102
4103         /* check for sense data */
4104         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4105                 sns_len = FSF_FCP_RSP_SIZE -
4106                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4107                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4108                                sns_len);
4109                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4110                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4111                                SCSI_SENSE_BUFFERSIZE);
4112                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4113                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4114                                scpnt->result);
4115                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4116                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4117
4118                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4119                                fcp_rsp_iu->fcp_sns_len);
4120                 memcpy(&scpnt->sense_buffer,
4121                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4122                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4123                               (void *) &scpnt->sense_buffer, sns_len);
4124         }
4125
4126         /* check for overrun */
4127         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4128                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4129                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4130                               "The response data length is "
4131                               "%d, the original length was %d.\n",
4132                               unit->fcp_lun,
4133                               unit->port->wwpn,
4134                               zfcp_get_busid_by_unit(unit),
4135                               fcp_rsp_iu->fcp_resid,
4136                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4137         }
4138
4139         /* check for underrun */
4140         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4141                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4142                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4143                               "The response data length is "
4144                               "%d, the original length was %d.\n",
4145                               unit->fcp_lun,
4146                               unit->port->wwpn,
4147                               zfcp_get_busid_by_unit(unit),
4148                               fcp_rsp_iu->fcp_resid,
4149                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4150
4151                 scpnt->resid = fcp_rsp_iu->fcp_resid;
4152                 if (scpnt->request_bufflen - scpnt->resid < scpnt->underflow)
4153                         set_host_byte(&scpnt->result, DID_ERROR);
4154         }
4155
4156  skip_fsfstatus:
4157         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4158
4159         if (scpnt->result != 0)
4160                 zfcp_scsi_dbf_event_result("erro", 3, fsf_req->adapter, scpnt);
4161         else if (scpnt->retries > 0)
4162                 zfcp_scsi_dbf_event_result("retr", 4, fsf_req->adapter, scpnt);
4163         else
4164                 zfcp_scsi_dbf_event_result("norm", 6, fsf_req->adapter, scpnt);
4165
4166         /* cleanup pointer (need this especially for abort) */
4167         scpnt->host_scribble = NULL;
4168
4169         /* always call back */
4170         (scpnt->scsi_done) (scpnt);
4171
4172         /*
4173          * We must hold this lock until scsi_done has been called.
4174          * Otherwise we may call scsi_done after abort regarding this
4175          * command has completed.
4176          * Note: scsi_done must not block!
4177          */
4178  out:
4179         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4180         return retval;
4181 }
4182
4183 /*
4184  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4185  *
4186  * purpose:     evaluates FCP_RSP IU
4187  *
4188  * returns:
4189  */
4190 static int
4191 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4192 {
4193         int retval = 0;
4194         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4195             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4196         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4197         struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
4198
4199         del_timer(&fsf_req->adapter->scsi_er_timer);
4200         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4201                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4202                 goto skip_fsfstatus;
4203         }
4204
4205         /* check FCP_RSP_INFO */
4206         switch (fcp_rsp_info[3]) {
4207         case RSP_CODE_GOOD:
4208                 /* ok, continue */
4209                 ZFCP_LOG_DEBUG("no failure or Task Management "
4210                                "Function complete\n");
4211                 break;
4212         case RSP_CODE_TASKMAN_UNSUPP:
4213                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4214                                 "is not supported on the target device "
4215                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4216                                 unit->fcp_lun,
4217                                 unit->port->wwpn,
4218                                 zfcp_get_busid_by_unit(unit));
4219                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4220                 break;
4221         case RSP_CODE_TASKMAN_FAILED:
4222                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4223                                 "failed to complete successfully. "
4224                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4225                                 unit->fcp_lun,
4226                                 unit->port->wwpn,
4227                                 zfcp_get_busid_by_unit(unit));
4228                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4229                 break;
4230         default:
4231                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4232                                 "code was detected for a command. "
4233                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4234                                 "(debug info 0x%x)\n",
4235                                 unit->fcp_lun,
4236                                 unit->port->wwpn,
4237                                 zfcp_get_busid_by_unit(unit),
4238                                 fcp_rsp_info[3]);
4239                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4240         }
4241
4242       skip_fsfstatus:
4243         return retval;
4244 }
4245
4246
4247 /*
4248  * function:    zfcp_fsf_control_file
4249  *
4250  * purpose:     Initiator of the control file upload/download FSF requests
4251  *
4252  * returns:     0           - FSF request is successfuly created and queued
4253  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4254  *              -EINVAL     - Invalid direction specified
4255  *              -ENOMEM     - Insufficient memory
4256  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4257  */
4258 int
4259 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4260                       struct zfcp_fsf_req **fsf_req_ptr,
4261                       u32 fsf_command,
4262                       u32 option,
4263                       struct zfcp_sg_list *sg_list)
4264 {
4265         struct zfcp_fsf_req *fsf_req;
4266         struct fsf_qtcb_bottom_support *bottom;
4267         volatile struct qdio_buffer_element *sbale;
4268         struct timer_list *timer;
4269         unsigned long lock_flags;
4270         int req_flags = 0;
4271         int direction;
4272         int retval = 0;
4273
4274         if (!(adapter->adapter_features & FSF_FEATURE_CFDC)) {
4275                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4276                               zfcp_get_busid_by_adapter(adapter));
4277                 retval = -EOPNOTSUPP;
4278                 goto out;
4279         }
4280
4281         switch (fsf_command) {
4282
4283         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4284                 direction = SBAL_FLAGS0_TYPE_WRITE;
4285                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4286                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4287                         req_flags = ZFCP_WAIT_FOR_SBAL;
4288                 break;
4289
4290         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4291                 direction = SBAL_FLAGS0_TYPE_READ;
4292                 break;
4293
4294         default:
4295                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4296                 retval = -EINVAL;
4297                 goto out;
4298         }
4299
4300         timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
4301         if (!timer) {
4302                 retval = -ENOMEM;
4303                 goto out;
4304         }
4305
4306         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4307                                      NULL, &lock_flags, &fsf_req);
4308         if (retval < 0) {
4309                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4310                               "adapter %s\n",
4311                         zfcp_get_busid_by_adapter(adapter));
4312                 retval = -EPERM;
4313                 goto unlock_queue_lock;
4314         }
4315
4316         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4317         sbale[0].flags |= direction;
4318
4319         bottom = &fsf_req->qtcb->bottom.support;
4320         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4321         bottom->option = option;
4322
4323         if (sg_list->count > 0) {
4324                 int bytes;
4325
4326                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4327                                                 sg_list->sg, sg_list->count,
4328                                                 ZFCP_MAX_SBALS_PER_REQ);
4329                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4330                         ZFCP_LOG_INFO(
4331                                 "error: Could not create sufficient number of "
4332                                 "SBALS for an FSF request to the adapter %s\n",
4333                                 zfcp_get_busid_by_adapter(adapter));
4334                         retval = -ENOMEM;
4335                         goto free_fsf_req;
4336                 }
4337         } else
4338                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4339
4340         init_timer(timer);
4341         timer->function = zfcp_fsf_request_timeout_handler;
4342         timer->data = (unsigned long) adapter;
4343         timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
4344
4345         retval = zfcp_fsf_req_send(fsf_req, timer);
4346         if (retval < 0) {
4347                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4348                               "(adapter %s)\n",
4349                               zfcp_get_busid_by_adapter(adapter));
4350                 retval = -EPERM;
4351                 goto free_fsf_req;
4352         }
4353         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4354
4355         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4356                         "adapter %s\n",
4357                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4358                         "download" : "upload",
4359                         zfcp_get_busid_by_adapter(adapter));
4360
4361         wait_event(fsf_req->completion_wq,
4362                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4363
4364         *fsf_req_ptr = fsf_req;
4365         del_timer_sync(timer);
4366         goto free_timer;
4367
4368  free_fsf_req:
4369         zfcp_fsf_req_free(fsf_req);
4370  unlock_queue_lock:
4371         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4372  free_timer:
4373         kfree(timer);
4374  out:
4375         return retval;
4376 }
4377
4378
4379 /*
4380  * function:    zfcp_fsf_control_file_handler
4381  *
4382  * purpose:     Handler of the control file upload/download FSF requests
4383  *
4384  * returns:     0       - FSF request successfuly processed
4385  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4386  *              -EACCES - There is no permission to execute an operation
4387  *              -EPERM  - The control file is not in a right format
4388  *              -EIO    - There is a problem with the FCP adapter
4389  *              -EINVAL - Invalid operation
4390  *              -EFAULT - User space memory I/O operation fault
4391  */
4392 static int
4393 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4394 {
4395         struct zfcp_adapter *adapter = fsf_req->adapter;
4396         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4397         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4398         int retval = 0;
4399
4400         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4401                 retval = -EINVAL;
4402                 goto skip_fsfstatus;
4403         }
4404
4405         switch (header->fsf_status) {
4406
4407         case FSF_GOOD:
4408                 ZFCP_LOG_NORMAL(
4409                         "The FSF request has been successfully completed "
4410                         "on the adapter %s\n",
4411                         zfcp_get_busid_by_adapter(adapter));
4412                 break;
4413
4414         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4415                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4416                         switch (header->fsf_status_qual.word[0]) {
4417
4418                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4419                                 ZFCP_LOG_NORMAL(
4420                                         "CFDC on the adapter %s has being "
4421                                         "hardened on primary and secondary SE\n",
4422                                         zfcp_get_busid_by_adapter(adapter));
4423                                 break;
4424
4425                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4426                                 ZFCP_LOG_NORMAL(
4427                                         "CFDC of the adapter %s could not "
4428                                         "be saved on the SE\n",
4429                                         zfcp_get_busid_by_adapter(adapter));
4430                                 break;
4431
4432                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4433                                 ZFCP_LOG_NORMAL(
4434                                         "CFDC of the adapter %s could not "
4435                                         "be copied to the secondary SE\n",
4436                                         zfcp_get_busid_by_adapter(adapter));
4437                                 break;
4438
4439                         default:
4440                                 ZFCP_LOG_NORMAL(
4441                                         "CFDC could not be hardened "
4442                                         "on the adapter %s\n",
4443                                         zfcp_get_busid_by_adapter(adapter));
4444                         }
4445                 }
4446                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4447                 retval = -EAGAIN;
4448                 break;
4449
4450         case FSF_AUTHORIZATION_FAILURE:
4451                 ZFCP_LOG_NORMAL(
4452                         "Adapter %s does not accept privileged commands\n",
4453                         zfcp_get_busid_by_adapter(adapter));
4454                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4455                 retval = -EACCES;
4456                 break;
4457
4458         case FSF_CFDC_ERROR_DETECTED:
4459                 ZFCP_LOG_NORMAL(
4460                         "Error at position %d in the CFDC, "
4461                         "CFDC is discarded by the adapter %s\n",
4462                         header->fsf_status_qual.word[0],
4463                         zfcp_get_busid_by_adapter(adapter));
4464                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4465                 retval = -EPERM;
4466                 break;
4467
4468         case FSF_CONTROL_FILE_UPDATE_ERROR:
4469                 ZFCP_LOG_NORMAL(
4470                         "Adapter %s cannot harden the control file, "
4471                         "file is discarded\n",
4472                         zfcp_get_busid_by_adapter(adapter));
4473                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4474                 retval = -EIO;
4475                 break;
4476
4477         case FSF_CONTROL_FILE_TOO_LARGE:
4478                 ZFCP_LOG_NORMAL(
4479                         "Control file is too large, file is discarded "
4480                         "by the adapter %s\n",
4481                         zfcp_get_busid_by_adapter(adapter));
4482                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4483                 retval = -EIO;
4484                 break;
4485
4486         case FSF_ACCESS_CONFLICT_DETECTED:
4487                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4488                         ZFCP_LOG_NORMAL(
4489                                 "CFDC has been discarded by the adapter %s, "
4490                                 "because activation would impact "
4491                                 "%d active connection(s)\n",
4492                                 zfcp_get_busid_by_adapter(adapter),
4493                                 header->fsf_status_qual.word[0]);
4494                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4495                 retval = -EIO;
4496                 break;
4497
4498         case FSF_CONFLICTS_OVERRULED:
4499                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4500                         ZFCP_LOG_NORMAL(
4501                                 "CFDC has been activated on the adapter %s, "
4502                                 "but activation has impacted "
4503                                 "%d active connection(s)\n",
4504                                 zfcp_get_busid_by_adapter(adapter),
4505                                 header->fsf_status_qual.word[0]);
4506                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4507                 retval = -EIO;
4508                 break;
4509
4510         case FSF_UNKNOWN_OP_SUBTYPE:
4511                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4512                                 "op_subtype=0x%x)\n",
4513                                 zfcp_get_busid_by_adapter(adapter),
4514                                 bottom->operation_subtype);
4515                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4516                 retval = -EINVAL;
4517                 break;
4518
4519         case FSF_INVALID_COMMAND_OPTION:
4520                 ZFCP_LOG_NORMAL(
4521                         "Invalid option 0x%x has been specified "
4522                         "in QTCB bottom sent to the adapter %s\n",
4523                         bottom->option,
4524                         zfcp_get_busid_by_adapter(adapter));
4525                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4526                 retval = -EINVAL;
4527                 break;
4528
4529         default:
4530                 ZFCP_LOG_NORMAL(
4531                         "bug: An unknown/unexpected FSF status 0x%08x "
4532                         "was presented on the adapter %s\n",
4533                         header->fsf_status,
4534                         zfcp_get_busid_by_adapter(adapter));
4535                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_sq_inval");
4536                 debug_exception(fsf_req->adapter->erp_dbf, 0,
4537                         &header->fsf_status_qual.word[0], sizeof(u32));
4538                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4539                 retval = -EINVAL;
4540                 break;
4541         }
4542
4543 skip_fsfstatus:
4544         return retval;
4545 }
4546
4547 static inline int
4548 zfcp_fsf_req_sbal_check(unsigned long *flags,
4549                         struct zfcp_qdio_queue *queue, int needed)
4550 {
4551         write_lock_irqsave(&queue->queue_lock, *flags);
4552         if (likely(atomic_read(&queue->free_count) >= needed))
4553                 return 1;
4554         write_unlock_irqrestore(&queue->queue_lock, *flags);
4555         return 0;
4556 }
4557
4558 /*
4559  * set qtcb pointer in fsf_req and initialize QTCB
4560  */
4561 static inline void
4562 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
4563 {
4564         if (likely(fsf_req->qtcb != NULL)) {
4565                 fsf_req->qtcb->prefix.req_seq_no = fsf_req->adapter->fsf_req_seq_no;
4566                 fsf_req->qtcb->prefix.req_id = (unsigned long)fsf_req;
4567                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4568                 fsf_req->qtcb->prefix.qtcb_type = fsf_qtcb_type[fsf_req->fsf_command];
4569                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4570                 fsf_req->qtcb->header.req_handle = (unsigned long)fsf_req;
4571                 fsf_req->qtcb->header.fsf_command = fsf_req->fsf_command;
4572         }
4573 }
4574
4575 /**
4576  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4577  * @adapter: adapter for which request queue is examined
4578  * @req_flags: flags indicating whether to wait for needed SBAL or not
4579  * @lock_flags: lock_flags if queue_lock is taken
4580  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4581  * Locks: lock adapter->request_queue->queue_lock on success
4582  */
4583 static int
4584 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4585                       unsigned long *lock_flags)
4586 {
4587         long ret;
4588         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4589
4590         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4591                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4592                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4593                                                        ZFCP_SBAL_TIMEOUT);
4594                 if (ret < 0)
4595                         return ret;
4596                 if (!ret)
4597                         return -EIO;
4598         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4599                 return -EIO;
4600
4601         return 0;
4602 }
4603
4604 /*
4605  * function:    zfcp_fsf_req_create
4606  *
4607  * purpose:     create an FSF request at the specified adapter and
4608  *              setup common fields
4609  *
4610  * returns:     -ENOMEM if there was insufficient memory for a request
4611  *              -EIO if no qdio buffers could be allocate to the request
4612  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4613  *              0 in success
4614  *
4615  * note:        The created request is returned by reference.
4616  *
4617  * locks:       lock of concerned request queue must not be held,
4618  *              but is held on completion (write, irqsave)
4619  */
4620 int
4621 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4622                     mempool_t *pool, unsigned long *lock_flags,
4623                     struct zfcp_fsf_req **fsf_req_p)
4624 {
4625         volatile struct qdio_buffer_element *sbale;
4626         struct zfcp_fsf_req *fsf_req = NULL;
4627         int ret = 0;
4628         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4629
4630         /* allocate new FSF request */
4631         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4632         if (unlikely(NULL == fsf_req)) {
4633                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into"
4634                                "the outbound (send) queue.\n");
4635                 ret = -ENOMEM;
4636                 goto failed_fsf_req;
4637         }
4638
4639         fsf_req->adapter = adapter;
4640         fsf_req->fsf_command = fsf_cmd;
4641
4642         zfcp_fsf_req_qtcb_init(fsf_req);
4643
4644         /* initialize waitqueue which may be used to wait on
4645            this request completion */
4646         init_waitqueue_head(&fsf_req->completion_wq);
4647
4648         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4649         if(ret < 0) {
4650                 goto failed_sbals;
4651         }
4652
4653         /*
4654          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4655          * if it is not set (see also *_open_qdio and *_close_qdio).
4656          */
4657
4658         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4659                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4660                 ret = -EIO;
4661                 goto failed_sbals;
4662         }
4663
4664         if (fsf_req->qtcb) {
4665                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4666                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4667         }
4668         fsf_req->sbal_number = 1;
4669         fsf_req->sbal_first = req_queue->free_index;
4670         fsf_req->sbal_curr = req_queue->free_index;
4671         fsf_req->sbale_curr = 1;
4672
4673         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4674                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4675         }
4676
4677         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4678
4679         /* setup common SBALE fields */
4680         sbale[0].addr = fsf_req;
4681         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4682         if (likely(fsf_req->qtcb != NULL)) {
4683                 sbale[1].addr = (void *) fsf_req->qtcb;
4684                 sbale[1].length = sizeof(struct fsf_qtcb);
4685         }
4686
4687         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4688                        fsf_req->sbal_number, fsf_req->sbal_first);
4689
4690         goto success;
4691
4692  failed_sbals:
4693 /* dequeue new FSF request previously enqueued */
4694         zfcp_fsf_req_free(fsf_req);
4695         fsf_req = NULL;
4696
4697  failed_fsf_req:
4698         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4699  success:
4700         *fsf_req_p = fsf_req;
4701         return ret;
4702 }
4703
4704 /*
4705  * function:    zfcp_fsf_req_send
4706  *
4707  * purpose:     start transfer of FSF request via QDIO
4708  *
4709  * returns:     0 - request transfer succesfully started
4710  *              !0 - start of request transfer failed
4711  */
4712 static int
4713 zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req, struct timer_list *timer)
4714 {
4715         struct zfcp_adapter *adapter;
4716         struct zfcp_qdio_queue *req_queue;
4717         volatile struct qdio_buffer_element *sbale;
4718         int inc_seq_no;
4719         int new_distance_from_int;
4720         unsigned long flags;
4721         int retval = 0;
4722
4723         adapter = fsf_req->adapter;
4724         req_queue = &adapter->request_queue,
4725
4726
4727         /* FIXME(debug): remove it later */
4728         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4729         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4730         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4731         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4732                       sbale[1].length);
4733
4734         /* put allocated FSF request at list tail */
4735         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4736         list_add_tail(&fsf_req->list, &adapter->fsf_req_list_head);
4737         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4738
4739         inc_seq_no = (fsf_req->qtcb != NULL);
4740
4741         /* figure out expiration time of timeout and start timeout */
4742         if (unlikely(timer)) {
4743                 timer->expires += jiffies;
4744                 add_timer(timer);
4745         }
4746
4747         ZFCP_LOG_TRACE("request queue of adapter %s: "
4748                        "next free SBAL is %i, %i free SBALs\n",
4749                        zfcp_get_busid_by_adapter(adapter),
4750                        req_queue->free_index,
4751                        atomic_read(&req_queue->free_count));
4752
4753         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4754                        "index_in_queue=%i, count=%i, buffers=%p\n",
4755                        zfcp_get_busid_by_adapter(adapter),
4756                        QDIO_FLAG_SYNC_OUTPUT,
4757                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4758                        &req_queue->buffer[fsf_req->sbal_first]);
4759
4760         /*
4761          * adjust the number of free SBALs in request queue as well as
4762          * position of first one
4763          */
4764         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4765         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4766         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4767         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4768         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4769
4770         fsf_req->issued = get_clock();
4771
4772         retval = do_QDIO(adapter->ccw_device,
4773                          QDIO_FLAG_SYNC_OUTPUT,
4774                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4775
4776         if (unlikely(retval)) {
4777                 /* Queues are down..... */
4778                 retval = -EIO;
4779                 /*
4780                  * FIXME(potential race):
4781                  * timer might be expired (absolutely unlikely)
4782                  */
4783                 if (timer)
4784                         del_timer(timer);
4785                 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4786                 list_del(&fsf_req->list);
4787                 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4788                 /*
4789                  * adjust the number of free SBALs in request queue as well as
4790                  * position of first one
4791                  */
4792                 zfcp_qdio_zero_sbals(req_queue->buffer,
4793                                      fsf_req->sbal_first, fsf_req->sbal_number);
4794                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4795                 req_queue->free_index -= fsf_req->sbal_number;   /* increase */
4796                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4797                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4798                 ZFCP_LOG_DEBUG
4799                         ("error: do_QDIO failed. Buffers could not be enqueued "
4800                          "to request queue.\n");
4801         } else {
4802                 req_queue->distance_from_int = new_distance_from_int;
4803                 /*
4804                  * increase FSF sequence counter -
4805                  * this must only be done for request successfully enqueued to
4806                  * QDIO this rejected requests may be cleaned up by calling
4807                  * routines  resulting in missing sequence counter values
4808                  * otherwise,
4809                  */
4810
4811                 /* Don't increase for unsolicited status */
4812                 if (inc_seq_no)
4813                         adapter->fsf_req_seq_no++;
4814
4815                 /* count FSF requests pending */
4816                 atomic_inc(&adapter->fsf_reqs_active);
4817         }
4818         return retval;
4819 }
4820
4821 #undef ZFCP_LOG_AREA