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   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 int zfcp_fsf_req_dispatch(struct zfcp_fsf_req *);
  63 static void zfcp_fsf_req_dismiss(struct zfcp_fsf_req *);
  64
  65 /* association between FSF command and FSF QTCB type */
  66 static u32 fsf_qtcb_type[] = {
  67         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  68         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  69         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  70         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  71         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  72         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  73         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  74         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  75         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  76         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  77         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  78         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  79         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  80 };
  81
  82 static const char zfcp_act_subtable_type[5][8] = {
  83         "unknown", "OS", "WWPN", "DID", "LUN"
  84 };
  85
  86 /****************************************************************/
  87 /*************** FSF related Functions  *************************/
  88 /****************************************************************/
  89
  90 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
  91
  92 /*
  93  * function:    zfcp_fsf_req_alloc
  94  *
  95  * purpose:     Obtains an fsf_req and potentially a qtcb (for all but
  96  *              unsolicited requests) via helper functions
  97  *              Does some initial fsf request set-up.
  98  *
  99  * returns:     pointer to allocated fsf_req if successfull
 100  *              NULL otherwise
 101  *
 102  * locks:       none
 103  *
 104  */
 105 static struct zfcp_fsf_req *
 106 zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
 107 {
 108         size_t size;
 109         void *ptr;
 110         struct zfcp_fsf_req *fsf_req = NULL;
 111
 112         if (req_flags & ZFCP_REQ_NO_QTCB)
 113                 size = sizeof(struct zfcp_fsf_req);
 114         else
 115                 size = sizeof(struct zfcp_fsf_req_pool_element);
 116
 117         if (likely(pool != NULL))
 118                 ptr = mempool_alloc(pool, GFP_ATOMIC);
 119         else
 120                 ptr = kmalloc(size, GFP_ATOMIC);
 121
 122         if (unlikely(NULL == ptr))
 123                 goto out;
 124
 125         memset(ptr, 0, size);
 126
 127         if (req_flags & ZFCP_REQ_NO_QTCB) {
 128                 fsf_req = (struct zfcp_fsf_req *) ptr;
 129         } else {
 130                 fsf_req = &((struct zfcp_fsf_req_pool_element *) ptr)->fsf_req;
 131                 fsf_req->qtcb =
 132                         &((struct zfcp_fsf_req_pool_element *) ptr)->qtcb;
 133         }
 134
 135         fsf_req->pool = pool;
 136
 137  out:
 138         return fsf_req;
 139 }
 140
 141 /*
 142  * function:    zfcp_fsf_req_free
 143  *
 144  * purpose:     Frees the memory of an fsf_req (and potentially a qtcb) or
 145  *              returns it into the pool via helper functions.
 146  *
 147  * returns:     sod all
 148  *
 149  * locks:       none
 150  */
 151 void
 152 zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
 153 {
 154         if (likely(fsf_req->pool != NULL))
 155                 mempool_free(fsf_req, fsf_req->pool);
 156         else
 157                 kfree(fsf_req);
 158 }
 159
 160 /*
 161  * function:
 162  *
 163  * purpose:
 164  *
 165  * returns:
 166  *
 167  * note: qdio queues shall be down (no ongoing inbound processing)
 168  */
 169 int
 170 zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 171 {
 172         struct zfcp_fsf_req *fsf_req, *tmp;
 173         unsigned long flags;
 174         LIST_HEAD(remove_queue);
 175
 176         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
 177         list_splice_init(&adapter->fsf_req_list_head, &remove_queue);
 178         atomic_set(&adapter->fsf_reqs_active, 0);
 179         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
 180
 181         list_for_each_entry_safe(fsf_req, tmp, &remove_queue, list) {
 182                 list_del(&fsf_req->list);
 183                 zfcp_fsf_req_dismiss(fsf_req);
 184         }
 185
 186         return 0;
 187 }
 188
 189 /*
 190  * function:
 191  *
 192  * purpose:
 193  *
 194  * returns:
 195  */
 196 static void
 197 zfcp_fsf_req_dismiss(struct zfcp_fsf_req *fsf_req)
 198 {
 199         fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 200         zfcp_fsf_req_complete(fsf_req);
 201 }
 202
 203 /*
 204  * function:    zfcp_fsf_req_complete
 205  *
 206  * purpose:     Updates active counts and timers for openfcp-reqs
 207  *              May cleanup request after req_eval returns
 208  *
 209  * returns:     0 - success
 210  *              !0 - failure
 211  *
 212  * context:
 213  */
 214 int
 215 zfcp_fsf_req_complete(struct zfcp_fsf_req *fsf_req)
 216 {
 217         int retval = 0;
 218         int cleanup;
 219
 220         if (unlikely(fsf_req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 221                 ZFCP_LOG_DEBUG("Status read response received\n");
 222                 /*
 223                  * Note: all cleanup handling is done in the callchain of
 224                  * the function call-chain below.
 225                  */
 226                 zfcp_fsf_status_read_handler(fsf_req);
 227                 goto out;
 228         } else
 229                 zfcp_fsf_protstatus_eval(fsf_req);
 230
 231         /*
 232          * fsf_req may be deleted due to waking up functions, so
 233          * cleanup is saved here and used later
 234          */
 235         if (likely(fsf_req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 236                 cleanup = 1;
 237         else
 238                 cleanup = 0;
 239
 240         fsf_req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 241
 242         /* cleanup request if requested by initiator */
 243         if (likely(cleanup)) {
 244                 ZFCP_LOG_TRACE("removing FSF request %p\n", fsf_req);
 245                 /*
 246                  * lock must not be held here since it will be
 247                  * grabed by the called routine, too
 248                  */
 249                 zfcp_fsf_req_free(fsf_req);
 250         } else {
 251                 /* notify initiator waiting for the requests completion */
 252                 ZFCP_LOG_TRACE("waking initiator of FSF request %p\n",fsf_req);
 253                 /*
 254                  * FIXME: Race! We must not access fsf_req here as it might have been
 255                  * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 256                  * flag. It's an improbable case. But, we have the same paranoia for
 257                  * the cleanup flag already.
 258                  * Might better be handled using complete()?
 259                  * (setting the flag and doing wakeup ought to be atomic
 260                  *  with regard to checking the flag as long as waitqueue is
 261                  *  part of the to be released structure)
 262                  */
 263                 wake_up(&fsf_req->completion_wq);
 264         }
 265
 266  out:
 267         return retval;
 268 }
 269
 270 /*
 271  * function:    zfcp_fsf_protstatus_eval
 272  *
 273  * purpose:     evaluates the QTCB of the finished FSF request
 274  *              and initiates appropriate actions
 275  *              (usually calling FSF command specific handlers)
 276  *
 277  * returns:
 278  *
 279  * context:
 280  *
 281  * locks:
 282  */
 283 static int
 284 zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *fsf_req)
 285 {
 286         int retval = 0;
 287         struct zfcp_adapter *adapter = fsf_req->adapter;
 288
 289         ZFCP_LOG_DEBUG("QTCB is at %p\n", fsf_req->qtcb);
 290
 291         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 292                 ZFCP_LOG_DEBUG("fsf_req 0x%lx has been dismissed\n",
 293                                (unsigned long) fsf_req);
 294                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 295                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 296                 zfcp_cmd_dbf_event_fsf("dismiss", fsf_req, NULL, 0);
 297                 goto skip_protstatus;
 298         }
 299
 300         /* log additional information provided by FSF (if any) */
 301         if (unlikely(fsf_req->qtcb->header.log_length)) {
 302                 /* do not trust them ;-) */
 303                 if (fsf_req->qtcb->header.log_start > sizeof(struct fsf_qtcb)) {
 304                         ZFCP_LOG_NORMAL
 305                             ("bug: ULP (FSF logging) log data starts "
 306                              "beyond end of packet header. Ignored. "
 307                              "(start=%i, size=%li)\n",
 308                              fsf_req->qtcb->header.log_start,
 309                              sizeof(struct fsf_qtcb));
 310                         goto forget_log;
 311                 }
 312                 if ((size_t) (fsf_req->qtcb->header.log_start +
 313                      fsf_req->qtcb->header.log_length)
 314                     > sizeof(struct fsf_qtcb)) {
 315                         ZFCP_LOG_NORMAL("bug: ULP (FSF logging) log data ends "
 316                                         "beyond end of packet header. Ignored. "
 317                                         "(start=%i, length=%i, size=%li)\n",
 318                                         fsf_req->qtcb->header.log_start,
 319                                         fsf_req->qtcb->header.log_length,
 320                                         sizeof(struct fsf_qtcb));
 321                         goto forget_log;
 322                 }
 323                 ZFCP_LOG_TRACE("ULP log data: \n");
 324                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 325                               (char *) fsf_req->qtcb +
 326                               fsf_req->qtcb->header.log_start,
 327                               fsf_req->qtcb->header.log_length);
 328         }
 329  forget_log:
 330
 331         /* evaluate FSF Protocol Status */
 332         switch (fsf_req->qtcb->prefix.prot_status) {
 333
 334         case FSF_PROT_GOOD:
 335         case FSF_PROT_FSF_STATUS_PRESENTED:
 336                 break;
 337
 338         case FSF_PROT_QTCB_VERSION_ERROR:
 339                 ZFCP_LOG_NORMAL("error: The adapter %s contains "
 340                                 "microcode of version 0x%x, the device driver "
 341                                 "only supports 0x%x. Aborting.\n",
 342                                 zfcp_get_busid_by_adapter(adapter),
 343                                 fsf_req->qtcb->prefix.prot_status_qual.
 344                                 version_error.fsf_version, ZFCP_QTCB_VERSION);
 345                 /* stop operation for this adapter */
 346                 debug_text_exception(adapter->erp_dbf, 0, "prot_ver_err");
 347                 zfcp_erp_adapter_shutdown(adapter, 0);
 348                 zfcp_cmd_dbf_event_fsf("qverserr", fsf_req,
 349                                        &fsf_req->qtcb->prefix.prot_status_qual,
 350                                        sizeof (union fsf_prot_status_qual));
 351                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 352                 break;
 353
 354         case FSF_PROT_SEQ_NUMB_ERROR:
 355                 ZFCP_LOG_NORMAL("bug: Sequence number mismatch between "
 356                                 "driver (0x%x) and adapter %s (0x%x). "
 357                                 "Restarting all operations on this adapter.\n",
 358                                 fsf_req->qtcb->prefix.req_seq_no,
 359                                 zfcp_get_busid_by_adapter(adapter),
 360                                 fsf_req->qtcb->prefix.prot_status_qual.
 361                                 sequence_error.exp_req_seq_no);
 362                 debug_text_exception(adapter->erp_dbf, 0, "prot_seq_err");
 363                 /* restart operation on this adapter */
 364                 zfcp_erp_adapter_reopen(adapter, 0);
 365                 zfcp_cmd_dbf_event_fsf("seqnoerr", fsf_req,
 366                                        &fsf_req->qtcb->prefix.prot_status_qual,
 367                                        sizeof (union fsf_prot_status_qual));
 368                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 369                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 370                 break;
 371
 372         case FSF_PROT_UNSUPP_QTCB_TYPE:
 373                 ZFCP_LOG_NORMAL("error: Packet header type used by the "
 374                                 "device driver is incompatible with "
 375                                 "that used on adapter %s. "
 376                                 "Stopping all operations on this adapter.\n",
 377                                 zfcp_get_busid_by_adapter(adapter));
 378                 debug_text_exception(adapter->erp_dbf, 0, "prot_unsup_qtcb");
 379                 zfcp_erp_adapter_shutdown(adapter, 0);
 380                 zfcp_cmd_dbf_event_fsf("unsqtcbt", fsf_req,
 381                                        &fsf_req->qtcb->prefix.prot_status_qual,
 382                                        sizeof (union fsf_prot_status_qual));
 383                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 384                 break;
 385
 386         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 387                 zfcp_cmd_dbf_event_fsf("hconinit", fsf_req,
 388                                        &fsf_req->qtcb->prefix.prot_status_qual,
 389                                        sizeof (union fsf_prot_status_qual));
 390                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 391                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 392                                 &(adapter->status));
 393                 debug_text_event(adapter->erp_dbf, 3, "prot_con_init");
 394                 break;
 395
 396         case FSF_PROT_DUPLICATE_REQUEST_ID:
 397                 if (fsf_req->qtcb) {
 398                         ZFCP_LOG_NORMAL("bug: The request identifier 0x%Lx "
 399                                         "to the adapter %s is ambiguous. "
 400                                         "Stopping all operations on this "
 401                                         "adapter.\n",
 402                                         *(unsigned long long *)
 403                                         (&fsf_req->qtcb->bottom.support.
 404                                          req_handle),
 405                                         zfcp_get_busid_by_adapter(adapter));
 406                 } else {
 407                         ZFCP_LOG_NORMAL("bug: The request identifier %p "
 408                                         "to the adapter %s is ambiguous. "
 409                                         "Stopping all operations on this "
 410                                         "adapter. "
 411                                         "(bug: got this for an unsolicited "
 412                                         "status read request)\n",
 413                                         fsf_req,
 414                                         zfcp_get_busid_by_adapter(adapter));
 415                 }
 416                 debug_text_exception(adapter->erp_dbf, 0, "prot_dup_id");
 417                 zfcp_erp_adapter_shutdown(adapter, 0);
 418                 zfcp_cmd_dbf_event_fsf("dupreqid", fsf_req,
 419                                        &fsf_req->qtcb->prefix.prot_status_qual,
 420                                        sizeof (union fsf_prot_status_qual));
 421                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 422                 break;
 423
 424         case FSF_PROT_LINK_DOWN:
 425                 /*
 426                  * 'test and set' is not atomic here -
 427                  * it's ok as long as calls to our response queue handler
 428                  * (and thus execution of this code here) are serialized
 429                  * by the qdio module
 430                  */
 431                 if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 432                                       &adapter->status)) {
 433                         switch (fsf_req->qtcb->prefix.prot_status_qual.
 434                                 locallink_error.code) {
 435                         case FSF_PSQ_LINK_NOLIGHT:
 436                                 ZFCP_LOG_INFO("The local link to adapter %s "
 437                                               "is down (no light detected).\n",
 438                                               zfcp_get_busid_by_adapter(
 439                                                       adapter));
 440                                 break;
 441                         case FSF_PSQ_LINK_WRAPPLUG:
 442                                 ZFCP_LOG_INFO("The local link to adapter %s "
 443                                               "is down (wrap plug detected).\n",
 444                                               zfcp_get_busid_by_adapter(
 445                                                       adapter));
 446                                 break;
 447                         case FSF_PSQ_LINK_NOFCP:
 448                                 ZFCP_LOG_INFO("The local link to adapter %s "
 449                                               "is down (adjacent node on "
 450                                               "link does not support FCP).\n",
 451                                               zfcp_get_busid_by_adapter(
 452                                                       adapter));
 453                                 break;
 454                         default:
 455                                 ZFCP_LOG_INFO("The local link to adapter %s "
 456                                               "is down "
 457                                               "(warning: unknown reason "
 458                                               "code).\n",
 459                                               zfcp_get_busid_by_adapter(
 460                                                       adapter));
 461                                 break;
 462
 463                         }
 464                         /*
 465                          * Due to the 'erp failed' flag the adapter won't
 466                          * be recovered but will be just set to 'blocked'
 467                          * state. All subordinary devices will have state
 468                          * 'blocked' and 'erp failed', too.
 469                          * Thus the adapter is still able to provide
 470                          * 'link up' status without being flooded with
 471                          * requests.
 472                          * (note: even 'close port' is not permitted)
 473                          */
 474                         ZFCP_LOG_INFO("Stopping all operations for adapter "
 475                                       "%s.\n",
 476                                       zfcp_get_busid_by_adapter(adapter));
 477                         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 478                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 479                                         &adapter->status);
 480                         zfcp_erp_adapter_reopen(adapter, 0);
 481                 }
 482                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 483                 break;
 484
 485         case FSF_PROT_REEST_QUEUE:
 486                 debug_text_event(adapter->erp_dbf, 1, "prot_reest_queue");
 487                 ZFCP_LOG_INFO("The local link to adapter with "
 488                               "%s was re-plugged. "
 489                               "Re-starting operations on this adapter.\n",
 490                               zfcp_get_busid_by_adapter(adapter));
 491                 /* All ports should be marked as ready to run again */
 492                 zfcp_erp_modify_adapter_status(adapter,
 493                                                ZFCP_STATUS_COMMON_RUNNING,
 494                                                ZFCP_SET);
 495                 zfcp_erp_adapter_reopen(adapter,
 496                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 497                                         | ZFCP_STATUS_COMMON_ERP_FAILED);
 498                 zfcp_cmd_dbf_event_fsf("reestque", fsf_req,
 499                                        &fsf_req->qtcb->prefix.prot_status_qual,
 500                                        sizeof (union fsf_prot_status_qual));
 501                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 502                 break;
 503
 504         case FSF_PROT_ERROR_STATE:
 505                 ZFCP_LOG_NORMAL("error: The adapter %s "
 506                                 "has entered the error state. "
 507                                 "Restarting all operations on this "
 508                                 "adapter.\n",
 509                                 zfcp_get_busid_by_adapter(adapter));
 510                 debug_text_event(adapter->erp_dbf, 0, "prot_err_sta");
 511                 /* restart operation on this adapter */
 512                 zfcp_erp_adapter_reopen(adapter, 0);
 513                 zfcp_cmd_dbf_event_fsf("proterrs", fsf_req,
 514                                        &fsf_req->qtcb->prefix.prot_status_qual,
 515                                        sizeof (union fsf_prot_status_qual));
 516                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 517                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 518                 break;
 519
 520         default:
 521                 ZFCP_LOG_NORMAL("bug: Transfer protocol status information "
 522                                 "provided by the adapter %s "
 523                                 "is not compatible with the device driver. "
 524                                 "Stopping all operations on this adapter. "
 525                                 "(debug info 0x%x).\n",
 526                                 zfcp_get_busid_by_adapter(adapter),
 527                                 fsf_req->qtcb->prefix.prot_status);
 528                 debug_text_event(adapter->erp_dbf, 0, "prot_inval:");
 529                 debug_exception(adapter->erp_dbf, 0,
 530                                 &fsf_req->qtcb->prefix.prot_status,
 531                                 sizeof (u32));
 532                 zfcp_erp_adapter_shutdown(adapter, 0);
 533                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 534         }
 535
 536  skip_protstatus:
 537         /*
 538          * always call specific handlers to give them a chance to do
 539          * something meaningful even in error cases
 540          */
 541         zfcp_fsf_fsfstatus_eval(fsf_req);
 542         return retval;
 543 }
 544
 545 /*
 546  * function:    zfcp_fsf_fsfstatus_eval
 547  *
 548  * purpose:     evaluates FSF status of completed FSF request
 549  *              and acts accordingly
 550  *
 551  * returns:
 552  */
 553 static int
 554 zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
 555 {
 556         int retval = 0;
 557
 558         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 559                 goto skip_fsfstatus;
 560         }
 561
 562         /* evaluate FSF Status */
 563         switch (fsf_req->qtcb->header.fsf_status) {
 564         case FSF_UNKNOWN_COMMAND:
 565                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 566                                 "not known by the adapter %s "
 567                                 "Stopping all operations on this adapter. "
 568                                 "(debug info 0x%x).\n",
 569                                 zfcp_get_busid_by_adapter(fsf_req->adapter),
 570                                 fsf_req->qtcb->header.fsf_command);
 571                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 572                                      "fsf_s_unknown");
 573                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 574                 zfcp_cmd_dbf_event_fsf("unknownc", fsf_req,
 575                                        &fsf_req->qtcb->header.fsf_status_qual,
 576                                        sizeof (union fsf_status_qual));
 577                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 578                 break;
 579
 580         case FSF_FCP_RSP_AVAILABLE:
 581                 ZFCP_LOG_DEBUG("FCP Sense data will be presented to the "
 582                                "SCSI stack.\n");
 583                 debug_text_event(fsf_req->adapter->erp_dbf, 3, "fsf_s_rsp");
 584                 break;
 585
 586         case FSF_ADAPTER_STATUS_AVAILABLE:
 587                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_astatus");
 588                 zfcp_fsf_fsfstatus_qual_eval(fsf_req);
 589                 break;
 590
 591         default:
 592                 break;
 593         }
 594
 595  skip_fsfstatus:
 596         /*
 597          * always call specific handlers to give them a chance to do
 598          * something meaningful even in error cases
 599          */
 600         zfcp_fsf_req_dispatch(fsf_req);
 601
 602         return retval;
 603 }
 604
 605 /*
 606  * function:    zfcp_fsf_fsfstatus_qual_eval
 607  *
 608  * purpose:     evaluates FSF status-qualifier of completed FSF request
 609  *              and acts accordingly
 610  *
 611  * returns:
 612  */
 613 static int
 614 zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
 615 {
 616         int retval = 0;
 617
 618         switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 619         case FSF_SQ_FCP_RSP_AVAILABLE:
 620                 debug_text_event(fsf_req->adapter->erp_dbf, 4, "fsf_sq_rsp");
 621                 break;
 622         case FSF_SQ_RETRY_IF_POSSIBLE:
 623                 /* The SCSI-stack may now issue retries or escalate */
 624                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_sq_retry");
 625                 zfcp_cmd_dbf_event_fsf("sqretry", fsf_req,
 626                                        &fsf_req->qtcb->header.fsf_status_qual,
 627                                        sizeof (union fsf_status_qual));
 628                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 629                 break;
 630         case FSF_SQ_COMMAND_ABORTED:
 631                 /* Carry the aborted state on to upper layer */
 632                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_sq_abort");
 633                 zfcp_cmd_dbf_event_fsf("sqabort", fsf_req,
 634                                        &fsf_req->qtcb->header.fsf_status_qual,
 635                                        sizeof (union fsf_status_qual));
 636                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 637                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 638                 break;
 639         case FSF_SQ_NO_RECOM:
 640                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 641                                      "fsf_sq_no_rec");
 642                 ZFCP_LOG_NORMAL("bug: No recommendation could be given for a"
 643                                 "problem on the adapter %s "
 644                                 "Stopping all operations on this adapter. ",
 645                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 646                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 647                 zfcp_cmd_dbf_event_fsf("sqnrecom", fsf_req,
 648                                        &fsf_req->qtcb->header.fsf_status_qual,
 649                                        sizeof (union fsf_status_qual));
 650                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 651                 break;
 652         case FSF_SQ_ULP_PROGRAMMING_ERROR:
 653                 ZFCP_LOG_NORMAL("error: not enough SBALs for data transfer "
 654                                 "(adapter %s)\n",
 655                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 656                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 657                                      "fsf_sq_ulp_err");
 658                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 659                 break;
 660         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 661         case FSF_SQ_NO_RETRY_POSSIBLE:
 662         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 663                 /* dealt with in the respective functions */
 664                 break;
 665         default:
 666                 ZFCP_LOG_NORMAL("bug: Additional status info could "
 667                                 "not be interpreted properly.\n");
 668                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 669                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
 670                               sizeof (union fsf_status_qual));
 671                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_sq_inval:");
 672                 debug_exception(fsf_req->adapter->erp_dbf, 0,
 673                                 &fsf_req->qtcb->header.fsf_status_qual.word[0],
 674                                 sizeof (u32));
 675                 zfcp_cmd_dbf_event_fsf("squndef", fsf_req,
 676                                        &fsf_req->qtcb->header.fsf_status_qual,
 677                                        sizeof (union fsf_status_qual));
 678                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 679                 break;
 680         }
 681
 682         return retval;
 683 }
 684
 685 /*
 686  * function:    zfcp_fsf_req_dispatch
 687  *
 688  * purpose:     calls the appropriate command specific handler
 689  *
 690  * returns:
 691  */
 692 static int
 693 zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
 694 {
 695         struct zfcp_erp_action *erp_action = fsf_req->erp_action;
 696         struct zfcp_adapter *adapter = fsf_req->adapter;
 697         int retval = 0;
 698
 699         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 700                 ZFCP_LOG_TRACE("fsf_req=%p, QTCB=%p\n", fsf_req, fsf_req->qtcb);
 701                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 702                               (char *) fsf_req->qtcb, sizeof(struct fsf_qtcb));
 703         }
 704
 705         switch (fsf_req->fsf_command) {
 706
 707         case FSF_QTCB_FCP_CMND:
 708                 zfcp_fsf_send_fcp_command_handler(fsf_req);
 709                 break;
 710
 711         case FSF_QTCB_ABORT_FCP_CMND:
 712                 zfcp_fsf_abort_fcp_command_handler(fsf_req);
 713                 break;
 714
 715         case FSF_QTCB_SEND_GENERIC:
 716                 zfcp_fsf_send_ct_handler(fsf_req);
 717                 break;
 718
 719         case FSF_QTCB_OPEN_PORT_WITH_DID:
 720                 zfcp_fsf_open_port_handler(fsf_req);
 721                 break;
 722
 723         case FSF_QTCB_OPEN_LUN:
 724                 zfcp_fsf_open_unit_handler(fsf_req);
 725                 break;
 726
 727         case FSF_QTCB_CLOSE_LUN:
 728                 zfcp_fsf_close_unit_handler(fsf_req);
 729                 break;
 730
 731         case FSF_QTCB_CLOSE_PORT:
 732                 zfcp_fsf_close_port_handler(fsf_req);
 733                 break;
 734
 735         case FSF_QTCB_CLOSE_PHYSICAL_PORT:
 736                 zfcp_fsf_close_physical_port_handler(fsf_req);
 737                 break;
 738
 739         case FSF_QTCB_EXCHANGE_CONFIG_DATA:
 740                 zfcp_fsf_exchange_config_data_handler(fsf_req);
 741                 break;
 742
 743         case FSF_QTCB_EXCHANGE_PORT_DATA:
 744                 zfcp_fsf_exchange_port_data_handler(fsf_req);
 745                 break;
 746
 747         case FSF_QTCB_SEND_ELS:
 748                 zfcp_fsf_send_els_handler(fsf_req);
 749                 break;
 750
 751         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 752                 zfcp_fsf_control_file_handler(fsf_req);
 753                 break;
 754
 755         case FSF_QTCB_UPLOAD_CONTROL_FILE:
 756                 zfcp_fsf_control_file_handler(fsf_req);
 757                 break;
 758
 759         default:
 760                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 761                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 762                                 "not supported by the adapter %s\n",
 763                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 764                 if (fsf_req->fsf_command != fsf_req->qtcb->header.fsf_command)
 765                         ZFCP_LOG_NORMAL
 766                             ("bug: Command issued by the device driver differs "
 767                              "from the command returned by the adapter %s "
 768                              "(debug info 0x%x, 0x%x).\n",
 769                              zfcp_get_busid_by_adapter(fsf_req->adapter),
 770                              fsf_req->fsf_command,
 771                              fsf_req->qtcb->header.fsf_command);
 772         }
 773
 774         if (!erp_action)
 775                 return retval;
 776
 777         debug_text_event(adapter->erp_dbf, 3, "a_frh");
 778         debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
 779         zfcp_erp_async_handler(erp_action, 0);
 780
 781         return retval;
 782 }
 783
 784 /*
 785  * function:    zfcp_fsf_status_read
 786  *
 787  * purpose:     initiates a Status Read command at the specified adapter
 788  *
 789  * returns:
 790  */
 791 int
 792 zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
 793 {
 794         struct zfcp_fsf_req *fsf_req;
 795         struct fsf_status_read_buffer *status_buffer;
 796         unsigned long lock_flags;
 797         volatile struct qdio_buffer_element *sbale;
 798         int retval = 0;
 799
 800         /* setup new FSF request */
 801         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 802                                      req_flags | ZFCP_REQ_NO_QTCB,
 803                                      adapter->pool.fsf_req_status_read,
 804                                      &lock_flags, &fsf_req);
 805         if (retval < 0) {
 806                 ZFCP_LOG_INFO("error: Could not create unsolicited status "
 807                               "buffer for adapter %s.\n",
 808                               zfcp_get_busid_by_adapter(adapter));
 809                 goto failed_req_create;
 810         }
 811
 812         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 813         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 814         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 815         fsf_req->sbale_curr = 2;
 816
 817         status_buffer =
 818                 mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 819         if (!status_buffer) {
 820                 ZFCP_LOG_NORMAL("bug: could not get some buffer\n");
 821                 goto failed_buf;
 822         }
 823         memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
 824         fsf_req->data = (unsigned long) status_buffer;
 825
 826         /* insert pointer to respective buffer */
 827         sbale = zfcp_qdio_sbale_curr(fsf_req);
 828         sbale->addr = (void *) status_buffer;
 829         sbale->length = sizeof(struct fsf_status_read_buffer);
 830
 831         /* start QDIO request for this FSF request */
 832         retval = zfcp_fsf_req_send(fsf_req, NULL);
 833         if (retval) {
 834                 ZFCP_LOG_DEBUG("error: Could not set-up unsolicited status "
 835                                "environment.\n");
 836                 goto failed_req_send;
 837         }
 838
 839         ZFCP_LOG_TRACE("Status Read request initiated (adapter%s)\n",
 840                        zfcp_get_busid_by_adapter(adapter));
 841         goto out;
 842
 843  failed_req_send:
 844         mempool_free(status_buffer, adapter->pool.data_status_read);
 845
 846  failed_buf:
 847         zfcp_fsf_req_free(fsf_req);
 848  failed_req_create:
 849  out:
 850         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 851         return retval;
 852 }
 853
 854 static int
 855 zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
 856 {
 857         struct fsf_status_read_buffer *status_buffer;
 858         struct zfcp_adapter *adapter;
 859         struct zfcp_port *port;
 860         unsigned long flags;
 861
 862         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
 863         adapter = fsf_req->adapter;
 864
 865         read_lock_irqsave(&zfcp_data.config_lock, flags);
 866         list_for_each_entry(port, &adapter->port_list_head, list)
 867             if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
 868                 break;
 869         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 870
 871         if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
 872                 ZFCP_LOG_NORMAL("bug: Reopen port indication received for"
 873                                 "nonexisting port with d_id 0x%08x on "
 874                                 "adapter %s. Ignored.\n",
 875                                 status_buffer->d_id & ZFCP_DID_MASK,
 876                                 zfcp_get_busid_by_adapter(adapter));
 877                 goto out;
 878         }
 879
 880         switch (status_buffer->status_subtype) {
 881
 882         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 883                 debug_text_event(adapter->erp_dbf, 3, "unsol_pc_phys:");
 884                 zfcp_erp_port_reopen(port, 0);
 885                 break;
 886
 887         case FSF_STATUS_READ_SUB_ERROR_PORT:
 888                 debug_text_event(adapter->erp_dbf, 1, "unsol_pc_err:");
 889                 zfcp_erp_port_shutdown(port, 0);
 890                 break;
 891
 892         default:
 893                 debug_text_event(adapter->erp_dbf, 0, "unsol_unk_sub:");
 894                 debug_exception(adapter->erp_dbf, 0,
 895                                 &status_buffer->status_subtype, sizeof (u32));
 896                 ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
 897                                 "for a reopen indication on port with "
 898                                 "d_id 0x%08x on the adapter %s. "
 899                                 "Ignored. (debug info 0x%x)\n",
 900                                 status_buffer->d_id,
 901                                 zfcp_get_busid_by_adapter(adapter),
 902                                 status_buffer->status_subtype);
 903         }
 904  out:
 905         return 0;
 906 }
 907
 908 /*
 909  * function:    zfcp_fsf_status_read_handler
 910  *
 911  * purpose:     is called for finished Open Port command
 912  *
 913  * returns:
 914  */
 915 static int
 916 zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
 917 {
 918         int retval = 0;
 919         struct zfcp_adapter *adapter = fsf_req->adapter;
 920         struct fsf_status_read_buffer *status_buffer =
 921                 (struct fsf_status_read_buffer *) fsf_req->data;
 922
 923         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 924                 mempool_free(status_buffer, adapter->pool.data_status_read);
 925                 zfcp_fsf_req_free(fsf_req);
 926                 goto out;
 927         }
 928
 929         switch (status_buffer->status_type) {
 930
 931         case FSF_STATUS_READ_PORT_CLOSED:
 932                 debug_text_event(adapter->erp_dbf, 3, "unsol_pclosed:");
 933                 debug_event(adapter->erp_dbf, 3,
 934                             &status_buffer->d_id, sizeof (u32));
 935                 zfcp_fsf_status_read_port_closed(fsf_req);
 936                 break;
 937
 938         case FSF_STATUS_READ_INCOMING_ELS:
 939                 debug_text_event(adapter->erp_dbf, 3, "unsol_els:");
 940                 zfcp_fsf_incoming_els(fsf_req);
 941                 break;
 942
 943         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 944                 debug_text_event(adapter->erp_dbf, 3, "unsol_sense:");
 945                 ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
 946                               zfcp_get_busid_by_adapter(adapter));
 947                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, (char *) status_buffer,
 948                               sizeof(struct fsf_status_read_buffer));
 949                 break;
 950
 951         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 952                 debug_text_event(adapter->erp_dbf, 3, "unsol_bit_err:");
 953                 ZFCP_LOG_NORMAL("Bit error threshold data received:\n");
 954                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 955                               (char *) status_buffer,
 956                               sizeof (struct fsf_status_read_buffer));
 957                 break;
 958
 959         case FSF_STATUS_READ_LINK_DOWN:
 960                 debug_text_event(adapter->erp_dbf, 0, "unsol_link_down:");
 961                 ZFCP_LOG_INFO("Local link to adapter %s is down\n",
 962                               zfcp_get_busid_by_adapter(adapter));
 963                 atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 964                                 &adapter->status);
 965                 zfcp_erp_adapter_failed(adapter);
 966                 break;
 967
 968         case FSF_STATUS_READ_LINK_UP:
 969                 debug_text_event(adapter->erp_dbf, 2, "unsol_link_up:");
 970                 ZFCP_LOG_INFO("Local link to adapter %s was replugged. "
 971                               "Restarting operations on this adapter\n",
 972                               zfcp_get_busid_by_adapter(adapter));
 973                 /* All ports should be marked as ready to run again */
 974                 zfcp_erp_modify_adapter_status(adapter,
 975                                                ZFCP_STATUS_COMMON_RUNNING,
 976                                                ZFCP_SET);
 977                 zfcp_erp_adapter_reopen(adapter,
 978                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 979                                         | ZFCP_STATUS_COMMON_ERP_FAILED);
 980                 break;
 981
 982         case FSF_STATUS_READ_CFDC_UPDATED:
 983                 debug_text_event(adapter->erp_dbf, 2, "unsol_cfdc_update:");
 984                 ZFCP_LOG_INFO("CFDC has been updated on the adapter %s\n",
 985                               zfcp_get_busid_by_adapter(adapter));
 986                 zfcp_erp_adapter_access_changed(adapter);
 987                 break;
 988
 989         case FSF_STATUS_READ_CFDC_HARDENED:
 990                 debug_text_event(adapter->erp_dbf, 2, "unsol_cfdc_harden:");
 991                 switch (status_buffer->status_subtype) {
 992                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
 993                         ZFCP_LOG_INFO("CFDC of adapter %s saved on SE\n",
 994                                       zfcp_get_busid_by_adapter(adapter));
 995                         break;
 996                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
 997                         ZFCP_LOG_INFO("CFDC of adapter %s has been copied "
 998                                       "to the secondary SE\n",
 999                                 zfcp_get_busid_by_adapter(adapter));
1000                         break;
1001                 default:
1002                         ZFCP_LOG_INFO("CFDC of adapter %s has been hardened\n",
1003                                       zfcp_get_busid_by_adapter(adapter));
1004                 }
1005                 break;
1006
1007         default:
1008                 debug_text_event(adapter->erp_dbf, 0, "unsol_unknown:");
1009                 debug_exception(adapter->erp_dbf, 0,
1010                                 &status_buffer->status_type, sizeof (u32));
1011                 ZFCP_LOG_NORMAL("bug: An unsolicited status packet of unknown "
1012                                 "type was received (debug info 0x%x)\n",
1013                                 status_buffer->status_type);
1014                 ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
1015                                status_buffer);
1016                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1017                               (char *) status_buffer,
1018                               sizeof (struct fsf_status_read_buffer));
1019                 break;
1020         }
1021         mempool_free(status_buffer, adapter->pool.data_status_read);
1022         zfcp_fsf_req_free(fsf_req);
1023         /*
1024          * recycle buffer and start new request repeat until outbound
1025          * queue is empty or adapter shutdown is requested
1026          */
1027         /*
1028          * FIXME(qdio):
1029          * we may wait in the req_create for 5s during shutdown, so
1030          * qdio_cleanup will have to wait at least that long before returning
1031          * with failure to allow us a proper cleanup under all circumstances
1032          */
1033         /*
1034          * FIXME:
1035          * allocation failure possible? (Is this code needed?)
1036          */
1037         retval = zfcp_fsf_status_read(adapter, 0);
1038         if (retval < 0) {
1039                 ZFCP_LOG_INFO("Failed to create unsolicited status read "
1040                               "request for the adapter %s.\n",
1041                               zfcp_get_busid_by_adapter(adapter));
1042                 /* temporary fix to avoid status read buffer shortage */
1043                 adapter->status_read_failed++;
1044                 if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
1045                     < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
1046                         ZFCP_LOG_INFO("restart adapter %s due to status read "
1047                                       "buffer shortage\n",
1048                                       zfcp_get_busid_by_adapter(adapter));
1049                         zfcp_erp_adapter_reopen(adapter, 0);
1050                 }
1051         }
1052  out:
1053         return retval;
1054 }
1055
1056 /*
1057  * function:    zfcp_fsf_abort_fcp_command
1058  *
1059  * purpose:     tells FSF to abort a running SCSI command
1060  *
1061  * returns:     address of initiated FSF request
1062  *              NULL - request could not be initiated
1063  *
1064  * FIXME(design): should be watched by a timeout !!!
1065  * FIXME(design) shouldn't this be modified to return an int
1066  *               also...don't know how though
1067  */
1068 struct zfcp_fsf_req *
1069 zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
1070                            struct zfcp_adapter *adapter,
1071                            struct zfcp_unit *unit, int req_flags)
1072 {
1073         volatile struct qdio_buffer_element *sbale;
1074         unsigned long lock_flags;
1075         struct zfcp_fsf_req *fsf_req = NULL;
1076         int retval = 0;
1077
1078         /* setup new FSF request */
1079         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
1080                                      req_flags, adapter->pool.fsf_req_abort,
1081                                      &lock_flags, &fsf_req);
1082         if (retval < 0) {
1083                 ZFCP_LOG_INFO("error: Failed to create an abort command "
1084                               "request for lun 0x%016Lx on port 0x%016Lx "
1085                               "on adapter %s.\n",
1086                               unit->fcp_lun,
1087                               unit->port->wwpn,
1088                               zfcp_get_busid_by_adapter(adapter));
1089                 goto out;
1090         }
1091
1092         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1093         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1094         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1095
1096         fsf_req->data = (unsigned long) unit;
1097
1098         /* set handles of unit and its parent port in QTCB */
1099         fsf_req->qtcb->header.lun_handle = unit->handle;
1100         fsf_req->qtcb->header.port_handle = unit->port->handle;
1101
1102         /* set handle of request which should be aborted */
1103         fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1104
1105         /* start QDIO request for this FSF request */
1106
1107         zfcp_fsf_start_scsi_er_timer(adapter);
1108         retval = zfcp_fsf_req_send(fsf_req, NULL);
1109         if (retval) {
1110                 del_timer(&adapter->scsi_er_timer);
1111                 ZFCP_LOG_INFO("error: Failed to send abort command request "
1112                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
1113                               zfcp_get_busid_by_adapter(adapter),
1114                               unit->port->wwpn, unit->fcp_lun);
1115                 zfcp_fsf_req_free(fsf_req);
1116                 fsf_req = NULL;
1117                 goto out;
1118         }
1119
1120         ZFCP_LOG_DEBUG("Abort FCP Command request initiated "
1121                        "(adapter%s, port d_id=0x%08x, "
1122                        "unit x%016Lx, old_req_id=0x%lx)\n",
1123                        zfcp_get_busid_by_adapter(adapter),
1124                        unit->port->d_id,
1125                        unit->fcp_lun, old_req_id);
1126  out:
1127         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
1128         return fsf_req;
1129 }
1130
1131 /*
1132  * function:    zfcp_fsf_abort_fcp_command_handler
1133  *
1134  * purpose:     is called for finished Abort FCP Command request
1135  *
1136  * returns:
1137  */
1138 static int
1139 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
1140 {
1141         int retval = -EINVAL;
1142         struct zfcp_unit *unit;
1143         unsigned char status_qual =
1144             new_fsf_req->qtcb->header.fsf_status_qual.word[0];
1145
1146         del_timer(&new_fsf_req->adapter->scsi_er_timer);
1147
1148         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1149                 /* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
1150                 goto skip_fsfstatus;
1151         }
1152
1153         unit = (struct zfcp_unit *) new_fsf_req->data;
1154
1155         /* evaluate FSF status in QTCB */
1156         switch (new_fsf_req->qtcb->header.fsf_status) {
1157
1158         case FSF_PORT_HANDLE_NOT_VALID:
1159                 if (status_qual >> 4 != status_qual % 0xf) {
1160                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1161                                          "fsf_s_phand_nv0");
1162                         /*
1163                          * In this case a command that was sent prior to a port
1164                          * reopen was aborted (handles are different). This is
1165                          * fine.
1166                          */
1167                 } else {
1168                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1169                                       "port 0x%016Lx on adapter %s invalid. "
1170                                       "This may happen occasionally.\n",
1171                                       unit->port->handle,
1172                                       unit->port->wwpn,
1173                                       zfcp_get_busid_by_unit(unit));
1174                         ZFCP_LOG_INFO("status qualifier:\n");
1175                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1176                                       (char *) &new_fsf_req->qtcb->header.
1177                                       fsf_status_qual,
1178                                       sizeof (union fsf_status_qual));
1179                         /* Let's hope this sorts out the mess */
1180                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1181                                          "fsf_s_phand_nv1");
1182                         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
1183                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1184                 }
1185                 break;
1186
1187         case FSF_LUN_HANDLE_NOT_VALID:
1188                 if (status_qual >> 4 != status_qual % 0xf) {
1189                         /* 2 */
1190                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1191                                          "fsf_s_lhand_nv0");
1192                         /*
1193                          * In this case a command that was sent prior to a unit
1194                          * reopen was aborted (handles are different).
1195                          * This is fine.
1196                          */
1197                 } else {
1198                         ZFCP_LOG_INFO
1199                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1200                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1201                              "invalid. This may happen in rare cases. "
1202                              "Trying to re-establish link.\n",
1203                              unit->handle,
1204                              unit->fcp_lun,
1205                              unit->port->wwpn,
1206                              zfcp_get_busid_by_unit(unit));
1207                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1208                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1209                                       (char *) &new_fsf_req->qtcb->header.
1210                                       fsf_status_qual,
1211                                       sizeof (union fsf_status_qual));
1212                         /* Let's hope this sorts out the mess */
1213                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1214                                          "fsf_s_lhand_nv1");
1215                         zfcp_erp_port_reopen(unit->port, 0);
1216                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1217                 }
1218                 break;
1219
1220         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1221                 retval = 0;
1222                 debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1223                                  "fsf_s_no_exist");
1224                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1225                 break;
1226
1227         case FSF_PORT_BOXED:
1228                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1229                               "be reopened\n", unit->port->wwpn,
1230                               zfcp_get_busid_by_unit(unit));
1231                 debug_text_event(new_fsf_req->adapter->erp_dbf, 2,
1232                                  "fsf_s_pboxed");
1233                 zfcp_erp_port_boxed(unit->port);
1234                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1235                     | ZFCP_STATUS_FSFREQ_RETRY;
1236                 break;
1237
1238         case FSF_LUN_BOXED:
1239                 ZFCP_LOG_INFO(
1240                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1241                         "to be reopened\n",
1242                         unit->fcp_lun, unit->port->wwpn,
1243                         zfcp_get_busid_by_unit(unit));
1244                 debug_text_event(new_fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
1245                 zfcp_erp_unit_boxed(unit);
1246                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1247                         | ZFCP_STATUS_FSFREQ_RETRY;
1248                 break;
1249
1250         case FSF_ADAPTER_STATUS_AVAILABLE:
1251                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1252                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1253                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1254                                          "fsf_sq_ltest");
1255                         zfcp_test_link(unit->port);
1256                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1257                         break;
1258                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1259                         /* SCSI stack will escalate */
1260                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1261                                          "fsf_sq_ulp");
1262                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1263                         break;
1264                 default:
1265                         ZFCP_LOG_NORMAL
1266                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1267                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1268                         debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1269                                          "fsf_sq_inval:");
1270                         debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1271                                         &new_fsf_req->qtcb->header.
1272                                         fsf_status_qual.word[0], sizeof (u32));
1273                         break;
1274                 }
1275                 break;
1276
1277         case FSF_GOOD:
1278                 retval = 0;
1279                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1280                 break;
1281
1282         default:
1283                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1284                                 "(debug info 0x%x)\n",
1285                                 new_fsf_req->qtcb->header.fsf_status);
1286                 debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1287                                  "fsf_s_inval:");
1288                 debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1289                                 &new_fsf_req->qtcb->header.fsf_status,
1290                                 sizeof (u32));
1291                 break;
1292         }
1293  skip_fsfstatus:
1294         return retval;
1295 }
1296
1297 /**
1298  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1299  *      one SBALE
1300  * Two scatter-gather lists are passed, one for the reqeust and one for the
1301  * response.
1302  */
1303 static inline int
1304 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1305                   struct scatterlist *resp, int resp_count)
1306 {
1307         return ((req_count == 1) &&
1308                 (resp_count == 1) &&
1309                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1310                   PAGE_MASK) ==
1311                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1312                                    req[0].length - 1) & PAGE_MASK)) &&
1313                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1314                   PAGE_MASK) ==
1315                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1316                                    resp[0].length - 1) & PAGE_MASK)));
1317 }
1318
1319 /**
1320  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1321  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1322  *      the request
1323  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1324  *      a struct zfcp_fsf_req
1325  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1326  *      is sent within error recovery
1327  */
1328 int
1329 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1330                  struct zfcp_erp_action *erp_action)
1331 {
1332         volatile struct qdio_buffer_element *sbale;
1333         struct zfcp_port *port;
1334         struct zfcp_adapter *adapter;
1335         struct zfcp_fsf_req *fsf_req;
1336         unsigned long lock_flags;
1337         int bytes;
1338         int ret = 0;
1339
1340         port = ct->port;
1341         adapter = port->adapter;
1342
1343         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1344                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1345                                   pool, &lock_flags, &fsf_req);
1346         if (ret < 0) {
1347                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1348                               "adapter: %s\n",
1349                               zfcp_get_busid_by_adapter(adapter));
1350                 goto failed_req;
1351         }
1352
1353         if (erp_action != NULL) {
1354                 erp_action->fsf_req = fsf_req;
1355                 fsf_req->erp_action = erp_action;
1356         }
1357
1358         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1359         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1360                               ct->resp, ct->resp_count)){
1361                 /* both request buffer and response buffer
1362                    fit into one sbale each */
1363                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1364                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1365                 sbale[2].length = ct->req[0].length;
1366                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1367                 sbale[3].length = ct->resp[0].length;
1368                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1369         } else if (adapter->supported_features &
1370                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1371                 /* try to use chained SBALs */
1372                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1373                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1374                                                 ct->req, ct->req_count,
1375                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1376                 if (bytes <= 0) {
1377                         ZFCP_LOG_INFO("error: creation of CT request failed "
1378                                       "on adapter %s\n",
1379                                       zfcp_get_busid_by_adapter(adapter));
1380                         if (bytes == 0)
1381                                 ret = -ENOMEM;
1382                         else
1383                                 ret = bytes;
1384
1385                         goto failed_send;
1386                 }
1387                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1388                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1389                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1390                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1391                                                 ct->resp, ct->resp_count,
1392                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1393                 if (bytes <= 0) {
1394                         ZFCP_LOG_INFO("error: creation of CT request failed "
1395                                       "on adapter %s\n",
1396                                       zfcp_get_busid_by_adapter(adapter));
1397                         if (bytes == 0)
1398                                 ret = -ENOMEM;
1399                         else
1400                                 ret = bytes;
1401
1402                         goto failed_send;
1403                 }
1404                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1405         } else {
1406                 /* reject send generic request */
1407                 ZFCP_LOG_INFO(
1408                         "error: microcode does not support chained SBALs,"
1409                         "CT request too big (adapter %s)\n",
1410                         zfcp_get_busid_by_adapter(adapter));
1411                 ret = -EOPNOTSUPP;
1412                 goto failed_send;
1413         }
1414
1415         /* settings in QTCB */
1416         fsf_req->qtcb->header.port_handle = port->handle;
1417         fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
1418         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1419         fsf_req->data = (unsigned long) ct;
1420
1421         /* start QDIO request for this FSF request */
1422         ret = zfcp_fsf_req_send(fsf_req, ct->timer);
1423         if (ret) {
1424                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1425                                "(adapter %s, port 0x%016Lx)\n",
1426                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1427                 goto failed_send;
1428         }
1429
1430         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1431                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1432         goto out;
1433
1434  failed_send:
1435         zfcp_fsf_req_free(fsf_req);
1436         if (erp_action != NULL) {
1437                 erp_action->fsf_req = NULL;
1438         }
1439  failed_req:
1440  out:
1441         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1442                                 lock_flags);
1443         return ret;
1444 }
1445
1446 /**
1447  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1448  * @fsf_req: pointer to struct zfcp_fsf_req
1449  *
1450  * Data specific for the Generic Service request is passed using
1451  * fsf_req->data. There we find the pointer to struct zfcp_send_ct.
1452  * Usually a specific handler for the CT request is called which is
1453  * found in this structure.
1454  */
1455 static int
1456 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1457 {
1458         struct zfcp_port *port;
1459         struct zfcp_adapter *adapter;
1460         struct zfcp_send_ct *send_ct;
1461         struct fsf_qtcb_header *header;
1462         struct fsf_qtcb_bottom_support *bottom;
1463         int retval = -EINVAL;
1464         u16 subtable, rule, counter;
1465
1466         adapter = fsf_req->adapter;
1467         send_ct = (struct zfcp_send_ct *) fsf_req->data;
1468         port = send_ct->port;
1469         header = &fsf_req->qtcb->header;
1470         bottom = &fsf_req->qtcb->bottom.support;
1471
1472         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1473                 goto skip_fsfstatus;
1474
1475         /* evaluate FSF status in QTCB */
1476         switch (header->fsf_status) {
1477
1478         case FSF_GOOD:
1479                 retval = 0;
1480                 break;
1481
1482         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1483                 if (adapter->fc_service_class <= 3) {
1484                         ZFCP_LOG_INFO("error: adapter %s does not support fc "
1485                                       "class %d.\n",
1486                                       zfcp_get_busid_by_port(port),
1487                                       adapter->fc_service_class);
1488                 } else {
1489                         ZFCP_LOG_INFO("bug: The fibre channel class at the "
1490                                       "adapter %s is invalid. "
1491                                       "(debug info %d)\n",
1492                                       zfcp_get_busid_by_port(port),
1493                                       adapter->fc_service_class);
1494                 }
1495                 /* stop operation for this adapter */
1496                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1497                 zfcp_erp_adapter_shutdown(adapter, 0);
1498                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1499                 break;
1500
1501         case FSF_ADAPTER_STATUS_AVAILABLE:
1502                 switch (header->fsf_status_qual.word[0]){
1503                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1504                         /* reopening link to port */
1505                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1506                         zfcp_test_link(port);
1507                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1508                         break;
1509                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1510                         /* ERP strategy will escalate */
1511                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1512                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1513                         break;
1514                 default:
1515                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1516                                       "arrived.\n",
1517                                       header->fsf_status_qual.word[0]);
1518                         break;
1519                 }
1520                 break;
1521
1522         case FSF_ACCESS_DENIED:
1523                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1524                                 "command (adapter %s, port d_id=0x%08x)\n",
1525                                 zfcp_get_busid_by_port(port), port->d_id);
1526                 for (counter = 0; counter < 2; counter++) {
1527                         subtable = header->fsf_status_qual.halfword[counter * 2];
1528                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1529                         switch (subtable) {
1530                         case FSF_SQ_CFDC_SUBTABLE_OS:
1531                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1532                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1533                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1534                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1535                                         zfcp_act_subtable_type[subtable], rule);
1536                                 break;
1537                         }
1538                 }
1539                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1540                 zfcp_erp_port_access_denied(port);
1541                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1542                 break;
1543
1544         case FSF_GENERIC_COMMAND_REJECTED:
1545                 ZFCP_LOG_INFO("generic service command rejected "
1546                               "(adapter %s, port d_id=0x%08x)\n",
1547                               zfcp_get_busid_by_port(port), port->d_id);
1548                 ZFCP_LOG_INFO("status qualifier:\n");
1549                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1550                               (char *) &header->fsf_status_qual,
1551                               sizeof (union fsf_status_qual));
1552                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_gcom_rej");
1553                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1554                 break;
1555
1556         case FSF_PORT_HANDLE_NOT_VALID:
1557                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1558                                "0x%016Lx on adapter %s invalid. This may "
1559                                "happen occasionally.\n", port->handle,
1560                                port->wwpn, zfcp_get_busid_by_port(port));
1561                 ZFCP_LOG_INFO("status qualifier:\n");
1562                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1563                               (char *) &header->fsf_status_qual,
1564                               sizeof (union fsf_status_qual));
1565                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_phandle_nv");
1566                 zfcp_erp_adapter_reopen(adapter, 0);
1567                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1568                 break;
1569
1570         case FSF_PORT_BOXED:
1571                 ZFCP_LOG_INFO("port needs to be reopened "
1572                               "(adapter %s, port d_id=0x%08x)\n",
1573                               zfcp_get_busid_by_port(port), port->d_id);
1574                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
1575                 zfcp_erp_port_boxed(port);
1576                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1577                     | ZFCP_STATUS_FSFREQ_RETRY;
1578                 break;
1579
1580         /* following states should never occure, all cases avoided
1581            in zfcp_fsf_send_ct - but who knows ... */
1582         case FSF_PAYLOAD_SIZE_MISMATCH:
1583                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1584                               "req_buf_length=%d, resp_buf_length=%d)\n",
1585                               zfcp_get_busid_by_adapter(adapter),
1586                               bottom->req_buf_length, bottom->resp_buf_length);
1587                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1588                 break;
1589         case FSF_REQUEST_SIZE_TOO_LARGE:
1590                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1591                               "req_buf_length=%d)\n",
1592                               zfcp_get_busid_by_adapter(adapter),
1593                               bottom->req_buf_length);
1594                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1595                 break;
1596         case FSF_RESPONSE_SIZE_TOO_LARGE:
1597                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1598                               "resp_buf_length=%d)\n",
1599                               zfcp_get_busid_by_adapter(adapter),
1600                               bottom->resp_buf_length);
1601                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1602                 break;
1603         case FSF_SBAL_MISMATCH:
1604                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1605                               "resp_buf_length=%d)\n",
1606                               zfcp_get_busid_by_adapter(adapter),
1607                               bottom->req_buf_length, bottom->resp_buf_length);
1608                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1609                 break;
1610
1611        default:
1612                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1613                                 "(debug info 0x%x)\n", header->fsf_status);
1614                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval:");
1615                 debug_exception(adapter->erp_dbf, 0,
1616                                 &header->fsf_status_qual.word[0], sizeof (u32));
1617                 break;
1618         }
1619
1620 skip_fsfstatus:
1621         send_ct->status = retval;
1622
1623         if (send_ct->handler != NULL)
1624                 send_ct->handler(send_ct->handler_data);
1625
1626         return retval;
1627 }
1628
1629 /**
1630  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1631  * @els: pointer to struct zfcp_send_els which contains all needed data for
1632  *      the command.
1633  */
1634 int
1635 zfcp_fsf_send_els(struct zfcp_send_els *els)
1636 {
1637         volatile struct qdio_buffer_element *sbale;
1638         struct zfcp_fsf_req *fsf_req;
1639         fc_id_t d_id;
1640         struct zfcp_adapter *adapter;
1641         unsigned long lock_flags;
1642         int bytes;
1643         int ret = 0;
1644
1645         d_id = els->d_id;
1646         adapter = els->adapter;
1647
1648         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1649                                   ZFCP_REQ_AUTO_CLEANUP,
1650                                   NULL, &lock_flags, &fsf_req);
1651         if (ret < 0) {
1652                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1653                               "(adapter %s, port d_id: 0x%08x)\n",
1654                               zfcp_get_busid_by_adapter(adapter), d_id);
1655                 goto failed_req;
1656         }
1657
1658         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1659         if (zfcp_use_one_sbal(els->req, els->req_count,
1660                               els->resp, els->resp_count)){
1661                 /* both request buffer and response buffer
1662                    fit into one sbale each */
1663                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1664                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1665                 sbale[2].length = els->req[0].length;
1666                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1667                 sbale[3].length = els->resp[0].length;
1668                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1669         } else if (adapter->supported_features &
1670                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1671                 /* try to use chained SBALs */
1672                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1673                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1674                                                 els->req, els->req_count,
1675                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1676                 if (bytes <= 0) {
1677                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1678                                       "(adapter %s, port d_id: 0x%08x)\n",
1679                                       zfcp_get_busid_by_adapter(adapter), d_id);
1680                         if (bytes == 0) {
1681                                 ret = -ENOMEM;
1682                         } else {
1683                                 ret = bytes;
1684                         }
1685                         goto failed_send;
1686                 }
1687                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1688                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1689                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1690                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1691                                                 els->resp, els->resp_count,
1692                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1693                 if (bytes <= 0) {
1694                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1695                                       "(adapter %s, port d_id: 0x%08x)\n",
1696                                       zfcp_get_busid_by_adapter(adapter), d_id);
1697                         if (bytes == 0) {
1698                                 ret = -ENOMEM;
1699                         } else {
1700                                 ret = bytes;
1701                         }
1702                         goto failed_send;
1703                 }
1704                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1705         } else {
1706                 /* reject request */
1707                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1708                               ", ELS request too big (adapter %s, "
1709                               "port d_id: 0x%08x)\n",
1710                               zfcp_get_busid_by_adapter(adapter), d_id);
1711                 ret = -EOPNOTSUPP;
1712                 goto failed_send;
1713         }
1714
1715         /* settings in QTCB */
1716         fsf_req->qtcb->bottom.support.d_id = d_id;
1717         fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
1718         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1719         fsf_req->data = (unsigned long) els;
1720
1721         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1722
1723         /* start QDIO request for this FSF request */
1724         ret = zfcp_fsf_req_send(fsf_req, els->timer);
1725         if (ret) {
1726                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1727                                "(adapter %s, port d_id: 0x%08x)\n",
1728                                zfcp_get_busid_by_adapter(adapter), d_id);
1729                 goto failed_send;
1730         }
1731
1732         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1733                        "0x%08x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1734         goto out;
1735
1736  failed_send:
1737         zfcp_fsf_req_free(fsf_req);
1738
1739  failed_req:
1740  out:
1741         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1742                                 lock_flags);
1743
1744         return ret;
1745 }
1746
1747 /**
1748  * zfcp_fsf_send_els_handler - handler for ELS commands
1749  * @fsf_req: pointer to struct zfcp_fsf_req
1750  *
1751  * Data specific for the ELS command is passed using
1752  * fsf_req->data. There we find the pointer to struct zfcp_send_els.
1753  * Usually a specific handler for the ELS command is called which is
1754  * found in this structure.
1755  */
1756 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1757 {
1758         struct zfcp_adapter *adapter;
1759         struct zfcp_port *port;
1760         fc_id_t d_id;
1761         struct fsf_qtcb_header *header;
1762         struct fsf_qtcb_bottom_support *bottom;
1763         struct zfcp_send_els *send_els;
1764         int retval = -EINVAL;
1765         u16 subtable, rule, counter;
1766
1767         send_els = (struct zfcp_send_els *) fsf_req->data;
1768         adapter = send_els->adapter;
1769         port = send_els->port;
1770         d_id = send_els->d_id;
1771         header = &fsf_req->qtcb->header;
1772         bottom = &fsf_req->qtcb->bottom.support;
1773
1774         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1775                 goto skip_fsfstatus;
1776
1777         switch (header->fsf_status) {
1778
1779         case FSF_GOOD:
1780                 retval = 0;
1781                 break;
1782
1783         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1784                 if (adapter->fc_service_class <= 3) {
1785                         ZFCP_LOG_INFO("error: adapter %s does "
1786                                       "not support fibrechannel class %d.\n",
1787                                       zfcp_get_busid_by_adapter(adapter),
1788                                       adapter->fc_service_class);
1789                 } else {
1790                         ZFCP_LOG_INFO("bug: The fibrechannel class at "
1791                                       "adapter %s is invalid. "
1792                                       "(debug info %d)\n",
1793                                       zfcp_get_busid_by_adapter(adapter),
1794                                       adapter->fc_service_class);
1795                 }
1796                 /* stop operation for this adapter */
1797                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1798                 zfcp_erp_adapter_shutdown(adapter, 0);
1799                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1800                 break;
1801
1802         case FSF_ADAPTER_STATUS_AVAILABLE:
1803                 switch (header->fsf_status_qual.word[0]){
1804                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1805                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1806                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1807                                 zfcp_test_link(port);
1808                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1809                         break;
1810                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1811                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1812                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1813                         retval =
1814                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1815                                               (struct zfcp_ls_rjt_par *)
1816                                               &header->fsf_status_qual.word[2]);
1817                         break;
1818                 case FSF_SQ_RETRY_IF_POSSIBLE:
1819                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_retry");
1820                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1821                         break;
1822                 default:
1823                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1824                                       header->fsf_status_qual.word[0]);
1825                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1826                                 (char*)header->fsf_status_qual.word, 16);
1827                 }
1828                 break;
1829
1830         case FSF_ELS_COMMAND_REJECTED:
1831                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1832                               "prohibited sending "
1833                               "(adapter: %s, port d_id: 0x%08x)\n",
1834                               zfcp_get_busid_by_adapter(adapter), d_id);
1835
1836                 break;
1837
1838         case FSF_PAYLOAD_SIZE_MISMATCH:
1839                 ZFCP_LOG_INFO(
1840                         "ELS request size and ELS response size must be either "
1841                         "both 0, or both greater than 0 "
1842                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1843                         zfcp_get_busid_by_adapter(adapter),
1844                         bottom->req_buf_length,
1845                         bottom->resp_buf_length);
1846                 break;
1847
1848         case FSF_REQUEST_SIZE_TOO_LARGE:
1849                 ZFCP_LOG_INFO(
1850                         "Length of the ELS request buffer, "
1851                         "specified in QTCB bottom, "
1852                         "exceeds the size of the buffers "
1853                         "that have been allocated for ELS request data "
1854                         "(adapter: %s, req_buf_length=%d)\n",
1855                         zfcp_get_busid_by_adapter(adapter),
1856                         bottom->req_buf_length);
1857                 break;
1858
1859         case FSF_RESPONSE_SIZE_TOO_LARGE:
1860                 ZFCP_LOG_INFO(
1861                         "Length of the ELS response buffer, "
1862                         "specified in QTCB bottom, "
1863                         "exceeds the size of the buffers "
1864                         "that have been allocated for ELS response data "
1865                         "(adapter: %s, resp_buf_length=%d)\n",
1866                         zfcp_get_busid_by_adapter(adapter),
1867                         bottom->resp_buf_length);
1868                 break;
1869
1870         case FSF_SBAL_MISMATCH:
1871                 /* should never occure, avoided in zfcp_fsf_send_els */
1872                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1873                               "resp_buf_length=%d)\n",
1874                               zfcp_get_busid_by_adapter(adapter),
1875                               bottom->req_buf_length, bottom->resp_buf_length);
1876                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1877                 break;
1878
1879         case FSF_ACCESS_DENIED:
1880                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1881                                 "(adapter %s, port d_id=0x%08x)\n",
1882                                 zfcp_get_busid_by_adapter(adapter), d_id);
1883                 for (counter = 0; counter < 2; counter++) {
1884                         subtable = header->fsf_status_qual.halfword[counter * 2];
1885                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1886                         switch (subtable) {
1887                         case FSF_SQ_CFDC_SUBTABLE_OS:
1888                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1889                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1890                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1891                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1892                                         zfcp_act_subtable_type[subtable], rule);
1893                                 break;
1894                         }
1895                 }
1896                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1897                 if (port != NULL)
1898                         zfcp_erp_port_access_denied(port);
1899                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1900                 break;
1901
1902         default:
1903                 ZFCP_LOG_NORMAL(
1904                         "bug: An unknown FSF Status was presented "
1905                         "(adapter: %s, fsf_status=0x%08x)\n",
1906                         zfcp_get_busid_by_adapter(adapter),
1907                         header->fsf_status);
1908                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval");
1909                 debug_exception(adapter->erp_dbf, 0,
1910                         &header->fsf_status_qual.word[0], sizeof(u32));
1911                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1912                 break;
1913         }
1914
1915 skip_fsfstatus:
1916         send_els->status = retval;
1917
1918         if (send_els->handler != 0)
1919                 send_els->handler(send_els->handler_data);
1920
1921         return retval;
1922 }
1923
1924 /*
1925  * function:
1926  *
1927  * purpose:
1928  *
1929  * returns:     address of initiated FSF request
1930  *              NULL - request could not be initiated
1931  */
1932 int
1933 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1934 {
1935         volatile struct qdio_buffer_element *sbale;
1936         unsigned long lock_flags;
1937         int retval = 0;
1938
1939         /* setup new FSF request */
1940         retval = zfcp_fsf_req_create(erp_action->adapter,
1941                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1942                                      ZFCP_REQ_AUTO_CLEANUP,
1943                                      erp_action->adapter->pool.fsf_req_erp,
1944                                      &lock_flags, &(erp_action->fsf_req));
1945         if (retval < 0) {
1946                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1947                               "data request for adapter %s.\n",
1948                               zfcp_get_busid_by_adapter(erp_action->adapter));
1949                 goto out;
1950         }
1951
1952         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
1953                                     erp_action->fsf_req->sbal_curr, 0);
1954         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1955         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1956
1957         erp_action->fsf_req->erp_action = erp_action;
1958         erp_action->fsf_req->qtcb->bottom.config.feature_selection =
1959                 (FSF_FEATURE_CFDC | FSF_FEATURE_LUN_SHARING);
1960
1961         /* start QDIO request for this FSF request */
1962         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
1963         if (retval) {
1964                 ZFCP_LOG_INFO
1965                     ("error: Could not send exchange configuration data "
1966                      "command on the adapter %s\n",
1967                      zfcp_get_busid_by_adapter(erp_action->adapter));
1968                 zfcp_fsf_req_free(erp_action->fsf_req);
1969                 erp_action->fsf_req = NULL;
1970                 goto out;
1971         }
1972
1973         ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1974                        "(adapter %s)\n",
1975                        zfcp_get_busid_by_adapter(erp_action->adapter));
1976
1977  out:
1978         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
1979                                 lock_flags);
1980         return retval;
1981 }
1982
1983 /**
1984  * zfcp_fsf_exchange_config_evaluate
1985  * @fsf_req: fsf_req which belongs to xchg config data request
1986  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1987  *
1988  * returns: -EIO on error, 0 otherwise
1989  */
1990 static int
1991 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
1992 {
1993         struct fsf_qtcb_bottom_config *bottom;
1994         struct zfcp_adapter *adapter = fsf_req->adapter;
1995
1996         bottom = &fsf_req->qtcb->bottom.config;
1997         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
1998                        bottom->low_qtcb_version, bottom->high_qtcb_version);
1999         adapter->fsf_lic_version = bottom->lic_version;
2000         adapter->supported_features = bottom->supported_features;
2001         adapter->peer_wwpn = 0;
2002         adapter->peer_wwnn = 0;
2003         adapter->peer_d_id = 0;
2004
2005         if (xchg_ok) {
2006                 adapter->wwnn = bottom->nport_serv_param.wwnn;
2007                 adapter->wwpn = bottom->nport_serv_param.wwpn;
2008                 adapter->s_id = bottom->s_id & ZFCP_DID_MASK;
2009                 adapter->fc_topology = bottom->fc_topology;
2010                 adapter->fc_link_speed = bottom->fc_link_speed;
2011                 adapter->hydra_version = bottom->adapter_type;
2012         } else {
2013                 adapter->wwnn = 0;
2014                 adapter->wwpn = 0;
2015                 adapter->s_id = 0;
2016                 adapter->fc_topology = 0;
2017                 adapter->fc_link_speed = 0;
2018                 adapter->hydra_version = 0;
2019         }
2020
2021         if (adapter->fc_topology == FSF_TOPO_P2P) {
2022                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2023                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2024                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2025         }
2026
2027         if(adapter->supported_features & FSF_FEATURE_HBAAPI_MANAGEMENT){
2028                 adapter->hardware_version = bottom->hardware_version;
2029                 memcpy(adapter->serial_number, bottom->serial_number, 17);
2030                 EBCASC(adapter->serial_number, sizeof(adapter->serial_number));
2031         }
2032
2033         ZFCP_LOG_NORMAL("The adapter %s reported the following characteristics:\n"
2034                       "WWNN 0x%016Lx, "
2035                       "WWPN 0x%016Lx, "
2036                       "S_ID 0x%08x,\n"
2037                       "adapter version 0x%x, "
2038                       "LIC version 0x%x, "
2039                       "FC link speed %d Gb/s\n",
2040                       zfcp_get_busid_by_adapter(adapter),
2041                       adapter->wwnn,
2042                       adapter->wwpn,
2043                       (unsigned int) adapter->s_id,
2044                       adapter->hydra_version,
2045                       adapter->fsf_lic_version,
2046                       adapter->fc_link_speed);
2047         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2048                 ZFCP_LOG_NORMAL("error: the adapter %s "
2049                                 "only supports newer control block "
2050                                 "versions in comparison to this device "
2051                                 "driver (try updated device driver)\n",
2052                                 zfcp_get_busid_by_adapter(adapter));
2053                 debug_text_event(adapter->erp_dbf, 0, "low_qtcb_ver");
2054                 zfcp_erp_adapter_shutdown(adapter, 0);
2055                 return -EIO;
2056         }
2057         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2058                 ZFCP_LOG_NORMAL("error: the adapter %s "
2059                                 "only supports older control block "
2060                                 "versions than this device driver uses"
2061                                 "(consider a microcode upgrade)\n",
2062                                 zfcp_get_busid_by_adapter(adapter));
2063                 debug_text_event(adapter->erp_dbf, 0, "high_qtcb_ver");
2064                 zfcp_erp_adapter_shutdown(adapter, 0);
2065                 return -EIO;
2066         }
2067         zfcp_set_fc_host_attrs(adapter);
2068         return 0;
2069 }
2070
2071 /*
2072  * function:    zfcp_fsf_exchange_config_data_handler
2073  *
2074  * purpose:     is called for finished Exchange Configuration Data command
2075  *
2076  * returns:
2077  */
2078 static int
2079 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2080 {
2081         struct fsf_qtcb_bottom_config *bottom;
2082         struct zfcp_adapter *adapter = fsf_req->adapter;
2083
2084         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2085                 return -EIO;
2086
2087         switch (fsf_req->qtcb->header.fsf_status) {
2088
2089         case FSF_GOOD:
2090                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2091                         return -EIO;
2092
2093                 switch (adapter->fc_topology) {
2094                 case FSF_TOPO_P2P:
2095                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2096                                         "configuration detected at adapter %s\n"
2097                                         "Peer WWNN 0x%016llx, "
2098                                         "peer WWPN 0x%016llx, "
2099                                         "peer d_id 0x%06x\n",
2100                                         zfcp_get_busid_by_adapter(adapter),
2101                                         adapter->peer_wwnn,
2102                                         adapter->peer_wwpn,
2103                                         adapter->peer_d_id);
2104                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2105                                          "top-p-to-p");
2106                         break;
2107                 case FSF_TOPO_AL:
2108                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2109                                         "topology detected at adapter %s "
2110                                         "unsupported, shutting down adapter\n",
2111                                         zfcp_get_busid_by_adapter(adapter));
2112                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2113                                          "top-al");
2114                         zfcp_erp_adapter_shutdown(adapter, 0);
2115                         return -EIO;
2116                 case FSF_TOPO_FABRIC:
2117                         ZFCP_LOG_INFO("Switched fabric fibrechannel "
2118                                       "network detected at adapter %s.\n",
2119                                       zfcp_get_busid_by_adapter(adapter));
2120                         break;
2121                 default:
2122                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2123                                         "reported by the exchange "
2124                                         "configuration command for "
2125                                         "the adapter %s is not "
2126                                         "of a type known to the zfcp "
2127                                         "driver, shutting down adapter\n",
2128                                         zfcp_get_busid_by_adapter(adapter));
2129                         adapter->fc_topology = FSF_TOPO_ERROR;
2130                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2131                                              "unknown-topo");
2132                         zfcp_erp_adapter_shutdown(adapter, 0);
2133                         return -EIO;
2134                 }
2135                 bottom = &fsf_req->qtcb->bottom.config;
2136                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2137                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2138                                         "allowed by the adapter %s "
2139                                         "is lower than the minimum "
2140                                         "required by the driver (%ld bytes).\n",
2141                                         bottom->max_qtcb_size,
2142                                         zfcp_get_busid_by_adapter(adapter),
2143                                         sizeof(struct fsf_qtcb));
2144                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2145                                          "qtcb-size");
2146                         debug_event(fsf_req->adapter->erp_dbf, 0,
2147                                     &bottom->max_qtcb_size, sizeof (u32));
2148                         zfcp_erp_adapter_shutdown(adapter, 0);
2149                         return -EIO;
2150                 }
2151                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2152                                 &adapter->status);
2153                 break;
2154         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2155                 debug_text_event(adapter->erp_dbf, 0, "xchg-inco");
2156
2157                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2158                         return -EIO;
2159
2160                 ZFCP_LOG_INFO("Local link to adapter %s is down\n",
2161                               zfcp_get_busid_by_adapter(adapter));
2162                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
2163                                 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
2164                                 &adapter->status);
2165                 zfcp_erp_adapter_failed(adapter);
2166                 break;
2167         default:
2168                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf-stat-ng");
2169                 debug_event(fsf_req->adapter->erp_dbf, 0,
2170                             &fsf_req->qtcb->header.fsf_status, sizeof (u32));
2171                 zfcp_erp_adapter_shutdown(adapter, 0);
2172                 return -EIO;
2173         }
2174         return 0;
2175 }
2176
2177 /**
2178  * zfcp_fsf_exchange_port_data - request information about local port
2179  * @adapter: for which port data is requested
2180  * @data: response to exchange port data request
2181  */
2182 int
2183 zfcp_fsf_exchange_port_data(struct zfcp_adapter *adapter,
2184                             struct fsf_qtcb_bottom_port *data)
2185 {
2186         volatile struct qdio_buffer_element *sbale;
2187         int retval = 0;
2188         unsigned long lock_flags;
2189         struct zfcp_fsf_req *fsf_req;
2190         struct timer_list *timer;
2191
2192         if(!(adapter->supported_features & FSF_FEATURE_HBAAPI_MANAGEMENT)){
2193                 ZFCP_LOG_INFO("error: exchange port data "
2194                               "command not supported by adapter %s\n",
2195                               zfcp_get_busid_by_adapter(adapter));
2196                 return -EOPNOTSUPP;
2197         }
2198
2199         timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
2200         if (!timer)
2201                 return -ENOMEM;
2202
2203         /* setup new FSF request */
2204         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2205                                      0, 0, &lock_flags, &fsf_req);
2206         if (retval < 0) {
2207                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2208                               "exchange port data request for"
2209                               "the adapter %s.\n",
2210                               zfcp_get_busid_by_adapter(adapter));
2211                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2212                                         lock_flags);
2213                 goto out;
2214         }
2215
2216         fsf_req->data = (unsigned long) data;
2217
2218         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2219         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2220         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2221
2222         init_timer(timer);
2223         timer->function = zfcp_fsf_request_timeout_handler;
2224         timer->data = (unsigned long) adapter;
2225         timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
2226
2227         retval = zfcp_fsf_req_send(fsf_req, timer);
2228         if (retval) {
2229                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2230                               "command on the adapter %s\n",
2231                               zfcp_get_busid_by_adapter(adapter));
2232                 zfcp_fsf_req_free(fsf_req);
2233                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2234                                         lock_flags);
2235                 goto out;
2236         }
2237
2238         ZFCP_LOG_DEBUG("Exchange Port Data request initiated (adapter %s)\n",
2239                        zfcp_get_busid_by_adapter(adapter));
2240
2241         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2242                                 lock_flags);
2243
2244         wait_event(fsf_req->completion_wq,
2245                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2246         del_timer_sync(timer);
2247         zfcp_fsf_req_free(fsf_req);
2248  out:
2249         kfree(timer);
2250         return retval;
2251 }
2252
2253
2254 /**
2255  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2256  * @fsf_req: pointer to struct zfcp_fsf_req
2257  */
2258 static void
2259 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2260 {
2261         struct fsf_qtcb_bottom_port *bottom;
2262         struct fsf_qtcb_bottom_port *data;
2263
2264         data = (struct fsf_qtcb_bottom_port*) fsf_req->data;
2265
2266         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2267                 return;
2268
2269         switch (fsf_req->qtcb->header.fsf_status) {
2270         case FSF_GOOD:
2271                 bottom = &fsf_req->qtcb->bottom.port;
2272                 memcpy(data, bottom, sizeof(*data));
2273                 break;
2274
2275         default:
2276                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "xchg-port-ng");
2277                 debug_event(fsf_req->adapter->erp_dbf, 0,
2278                             &fsf_req->qtcb->header.fsf_status, sizeof(u32));
2279         }
2280 }
2281
2282
2283 /*
2284  * function:    zfcp_fsf_open_port
2285  *
2286  * purpose:
2287  *
2288  * returns:     address of initiated FSF request
2289  *              NULL - request could not be initiated
2290  */
2291 int
2292 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2293 {
2294         volatile struct qdio_buffer_element *sbale;
2295         unsigned long lock_flags;
2296         int retval = 0;
2297
2298         /* setup new FSF request */
2299         retval = zfcp_fsf_req_create(erp_action->adapter,
2300                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2301                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2302                                      erp_action->adapter->pool.fsf_req_erp,
2303                                      &lock_flags, &(erp_action->fsf_req));
2304         if (retval < 0) {
2305                 ZFCP_LOG_INFO("error: Could not create open port request "
2306                               "for port 0x%016Lx on adapter %s.\n",
2307                               erp_action->port->wwpn,
2308                               zfcp_get_busid_by_adapter(erp_action->adapter));
2309                 goto out;
2310         }
2311
2312         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2313                                     erp_action->fsf_req->sbal_curr, 0);
2314         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2315         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2316
2317         erp_action->fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2318         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2319         erp_action->fsf_req->data = (unsigned long) erp_action->port;
2320         erp_action->fsf_req->erp_action = erp_action;
2321
2322         /* start QDIO request for this FSF request */
2323         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2324         if (retval) {
2325                 ZFCP_LOG_INFO("error: Could not send open port request for "
2326                               "port 0x%016Lx on adapter %s.\n",
2327                               erp_action->port->wwpn,
2328                               zfcp_get_busid_by_adapter(erp_action->adapter));
2329                 zfcp_fsf_req_free(erp_action->fsf_req);
2330                 erp_action->fsf_req = NULL;
2331                 goto out;
2332         }
2333
2334         ZFCP_LOG_DEBUG("open port request initiated "
2335                        "(adapter %s,  port 0x%016Lx)\n",
2336                        zfcp_get_busid_by_adapter(erp_action->adapter),
2337                        erp_action->port->wwpn);
2338  out:
2339         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2340                                 lock_flags);
2341         return retval;
2342 }
2343
2344 /*
2345  * function:    zfcp_fsf_open_port_handler
2346  *
2347  * purpose:     is called for finished Open Port command
2348  *
2349  * returns:
2350  */
2351 static int
2352 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2353 {
2354         int retval = -EINVAL;
2355         struct zfcp_port *port;
2356         struct fsf_plogi *plogi;
2357         struct fsf_qtcb_header *header;
2358         u16 subtable, rule, counter;
2359
2360         port = (struct zfcp_port *) fsf_req->data;
2361         header = &fsf_req->qtcb->header;
2362
2363         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2364                 /* don't change port status in our bookkeeping */
2365                 goto skip_fsfstatus;
2366         }
2367
2368         /* evaluate FSF status in QTCB */
2369         switch (header->fsf_status) {
2370
2371         case FSF_PORT_ALREADY_OPEN:
2372                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2373                                 "is already open.\n",
2374                                 port->wwpn, zfcp_get_busid_by_port(port));
2375                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2376                                      "fsf_s_popen");
2377                 /*
2378                  * This is a bug, however operation should continue normally
2379                  * if it is simply ignored
2380                  */
2381                 break;
2382
2383         case FSF_ACCESS_DENIED:
2384                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2385                                 "on adapter %s\n",
2386                                 port->wwpn, zfcp_get_busid_by_port(port));
2387                 for (counter = 0; counter < 2; counter++) {
2388                         subtable = header->fsf_status_qual.halfword[counter * 2];
2389                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2390                         switch (subtable) {
2391                         case FSF_SQ_CFDC_SUBTABLE_OS:
2392                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2393                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2394                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2395                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2396                                         zfcp_act_subtable_type[subtable], rule);
2397                                 break;
2398                         }
2399                 }
2400                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2401                 zfcp_erp_port_access_denied(port);
2402                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2403                 break;
2404
2405         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2406                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2407                               "The remote port 0x%016Lx on adapter %s "
2408                               "could not be opened. Disabling it.\n",
2409                               port->wwpn, zfcp_get_busid_by_port(port));
2410                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2411                                  "fsf_s_max_ports");
2412                 zfcp_erp_port_failed(port);
2413                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2414                 break;
2415
2416         case FSF_ADAPTER_STATUS_AVAILABLE:
2417                 switch (header->fsf_status_qual.word[0]) {
2418                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2419                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2420                                          "fsf_sq_ltest");
2421                         /* ERP strategy will escalate */
2422                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2423                         break;
2424                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2425                         /* ERP strategy will escalate */
2426                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2427                                          "fsf_sq_ulp");
2428                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2429                         break;
2430                 case FSF_SQ_NO_RETRY_POSSIBLE:
2431                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2432                                         "adapter %s could not be opened. "
2433                                         "Disabling it.\n",
2434                                         port->wwpn,
2435                                         zfcp_get_busid_by_port(port));
2436                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2437                                              "fsf_sq_no_retry");
2438                         zfcp_erp_port_failed(port);
2439                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2440                         break;
2441                 default:
2442                         ZFCP_LOG_NORMAL
2443                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2444                              header->fsf_status_qual.word[0]);
2445                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2446                                          "fsf_sq_inval:");
2447                         debug_exception(
2448                                 fsf_req->adapter->erp_dbf, 0,
2449                                 &header->fsf_status_qual.word[0],
2450                                 sizeof (u32));
2451                         break;
2452                 }
2453                 break;
2454
2455         case FSF_GOOD:
2456                 /* save port handle assigned by FSF */
2457                 port->handle = header->port_handle;
2458                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2459                               "was opened, it's port handle is 0x%x\n",
2460                               port->wwpn, zfcp_get_busid_by_port(port),
2461                               port->handle);
2462                 /* mark port as open */
2463                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2464                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2465                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2466                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2467                                   &port->status);
2468                 retval = 0;
2469                 /* check whether D_ID has changed during open */
2470                 /*
2471                  * FIXME: This check is not airtight, as the FCP channel does
2472                  * not monitor closures of target port connections caused on
2473                  * the remote side. Thus, they might miss out on invalidating
2474                  * locally cached WWPNs (and other N_Port parameters) of gone
2475                  * target ports. So, our heroic attempt to make things safe
2476                  * could be undermined by 'open port' response data tagged with
2477                  * obsolete WWPNs. Another reason to monitor potential
2478                  * connection closures ourself at least (by interpreting
2479                  * incoming ELS' and unsolicited status). It just crosses my
2480                  * mind that one should be able to cross-check by means of
2481                  * another GID_PN straight after a port has been opened.
2482                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2483                  */
2484                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2485                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2486                 {
2487                         if (fsf_req->qtcb->bottom.support.els1_length <
2488                             ((((unsigned long) &plogi->serv_param.wwpn) -
2489                               ((unsigned long) plogi)) + sizeof (u64))) {
2490                                 ZFCP_LOG_INFO(
2491                                         "warning: insufficient length of "
2492                                         "PLOGI payload (%i)\n",
2493                                         fsf_req->qtcb->bottom.support.els1_length);
2494                                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
2495                                                  "fsf_s_short_plogi:");
2496                                 /* skip sanity check and assume wwpn is ok */
2497                         } else {
2498                                 if (plogi->serv_param.wwpn != port->wwpn) {
2499                                         ZFCP_LOG_INFO("warning: d_id of port "
2500                                                       "0x%016Lx changed during "
2501                                                       "open\n", port->wwpn);
2502                                         debug_text_event(
2503                                                 fsf_req->adapter->erp_dbf, 0,
2504                                                 "fsf_s_did_change:");
2505                                         atomic_clear_mask(
2506                                                 ZFCP_STATUS_PORT_DID_DID,
2507                                                 &port->status);
2508                                 } else
2509                                         port->wwnn = plogi->serv_param.wwnn;
2510                         }
2511                 }
2512                 break;
2513
2514         case FSF_UNKNOWN_OP_SUBTYPE:
2515                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2516                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2517                               "op_subtype=0x%x)\n",
2518                               zfcp_get_busid_by_port(port),
2519                               fsf_req->qtcb->bottom.support.operation_subtype);
2520                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2521                 break;
2522
2523         default:
2524                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2525                                 "(debug info 0x%x)\n",
2526                                 header->fsf_status);
2527                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2528                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2529                                 &header->fsf_status, sizeof (u32));
2530                 break;
2531         }
2532
2533  skip_fsfstatus:
2534         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2535         return retval;
2536 }
2537
2538 /*
2539  * function:    zfcp_fsf_close_port
2540  *
2541  * purpose:     submit FSF command "close port"
2542  *
2543  * returns:     address of initiated FSF request
2544  *              NULL - request could not be initiated
2545  */
2546 int
2547 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2548 {
2549         volatile struct qdio_buffer_element *sbale;
2550         unsigned long lock_flags;
2551         int retval = 0;
2552
2553         /* setup new FSF request */
2554         retval = zfcp_fsf_req_create(erp_action->adapter,
2555                                      FSF_QTCB_CLOSE_PORT,
2556                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2557                                      erp_action->adapter->pool.fsf_req_erp,
2558                                      &lock_flags, &(erp_action->fsf_req));
2559         if (retval < 0) {
2560                 ZFCP_LOG_INFO("error: Could not create a close port request "
2561                               "for port 0x%016Lx on adapter %s.\n",
2562                               erp_action->port->wwpn,
2563                               zfcp_get_busid_by_adapter(erp_action->adapter));
2564                 goto out;
2565         }
2566
2567         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2568                                     erp_action->fsf_req->sbal_curr, 0);
2569         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2570         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2571
2572         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2573         erp_action->fsf_req->data = (unsigned long) erp_action->port;
2574         erp_action->fsf_req->erp_action = erp_action;
2575         erp_action->fsf_req->qtcb->header.port_handle =
2576             erp_action->port->handle;
2577
2578         /* start QDIO request for this FSF request */
2579         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2580         if (retval) {
2581                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2582                               "port 0x%016Lx on adapter %s.\n",
2583                               erp_action->port->wwpn,
2584                               zfcp_get_busid_by_adapter(erp_action->adapter));
2585                 zfcp_fsf_req_free(erp_action->fsf_req);
2586                 erp_action->fsf_req = NULL;
2587                 goto out;
2588         }
2589
2590         ZFCP_LOG_TRACE("close port request initiated "
2591                        "(adapter %s, port 0x%016Lx)\n",
2592                        zfcp_get_busid_by_adapter(erp_action->adapter),
2593                        erp_action->port->wwpn);
2594  out:
2595         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2596                                 lock_flags);
2597         return retval;
2598 }
2599
2600 /*
2601  * function:    zfcp_fsf_close_port_handler
2602  *
2603  * purpose:     is called for finished Close Port FSF command
2604  *
2605  * returns:
2606  */
2607 static int
2608 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2609 {
2610         int retval = -EINVAL;
2611         struct zfcp_port *port;
2612
2613         port = (struct zfcp_port *) fsf_req->data;
2614
2615         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2616                 /* don't change port status in our bookkeeping */
2617                 goto skip_fsfstatus;
2618         }
2619
2620         /* evaluate FSF status in QTCB */
2621         switch (fsf_req->qtcb->header.fsf_status) {
2622
2623         case FSF_PORT_HANDLE_NOT_VALID:
2624                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2625                               "0x%016Lx on adapter %s invalid. This may happen "
2626                               "occasionally.\n", port->handle,
2627                               port->wwpn, zfcp_get_busid_by_port(port));
2628                 ZFCP_LOG_DEBUG("status qualifier:\n");
2629                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2630                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2631                               sizeof (union fsf_status_qual));
2632                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2633                                  "fsf_s_phand_nv");
2634                 zfcp_erp_adapter_reopen(port->adapter, 0);
2635                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2636                 break;
2637
2638         case FSF_ADAPTER_STATUS_AVAILABLE:
2639                 /* Note: FSF has actually closed the port in this case.
2640                  * The status code is just daft. Fingers crossed for a change
2641                  */
2642                 retval = 0;
2643                 break;
2644
2645         case FSF_GOOD:
2646                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2647                                "port handle 0x%x\n", port->wwpn,
2648                                zfcp_get_busid_by_port(port), port->handle);
2649                 zfcp_erp_modify_port_status(port,
2650                                             ZFCP_STATUS_COMMON_OPEN,
2651                                             ZFCP_CLEAR);
2652                 retval = 0;
2653                 break;
2654
2655         default:
2656                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2657                                 "(debug info 0x%x)\n",
2658                                 fsf_req->qtcb->header.fsf_status);
2659                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2660                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2661                                 &fsf_req->qtcb->header.fsf_status,
2662                                 sizeof (u32));
2663                 break;
2664         }
2665
2666  skip_fsfstatus:
2667         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2668         return retval;
2669 }
2670
2671 /*
2672  * function:    zfcp_fsf_close_physical_port
2673  *
2674  * purpose:     submit FSF command "close physical port"
2675  *
2676  * returns:     address of initiated FSF request
2677  *              NULL - request could not be initiated
2678  */
2679 int
2680 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2681 {
2682         int retval = 0;
2683         unsigned long lock_flags;
2684         volatile struct qdio_buffer_element *sbale;
2685
2686         /* setup new FSF request */
2687         retval = zfcp_fsf_req_create(erp_action->adapter,
2688                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2689                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2690                                      erp_action->adapter->pool.fsf_req_erp,
2691                                      &lock_flags, &erp_action->fsf_req);
2692         if (retval < 0) {
2693                 ZFCP_LOG_INFO("error: Could not create close physical port "
2694                               "request (adapter %s, port 0x%016Lx)\n",
2695                               zfcp_get_busid_by_adapter(erp_action->adapter),
2696                               erp_action->port->wwpn);
2697
2698                 goto out;
2699         }
2700
2701         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2702                                     erp_action->fsf_req->sbal_curr, 0);
2703         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2704         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2705
2706         /* mark port as being closed */
2707         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2708                         &erp_action->port->status);
2709         /* save a pointer to this port */
2710         erp_action->fsf_req->data = (unsigned long) erp_action->port;
2711         /* port to be closeed */
2712         erp_action->fsf_req->qtcb->header.port_handle =
2713             erp_action->port->handle;
2714         erp_action->fsf_req->erp_action = erp_action;
2715
2716         /* start QDIO request for this FSF request */
2717         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2718         if (retval) {
2719                 ZFCP_LOG_INFO("error: Could not send 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                 zfcp_fsf_req_free(erp_action->fsf_req);
2724                 erp_action->fsf_req = NULL;
2725                 goto out;
2726         }
2727
2728         ZFCP_LOG_TRACE("close physical port request initiated "
2729                        "(adapter %s, port 0x%016Lx)\n",
2730                        zfcp_get_busid_by_adapter(erp_action->adapter),
2731                        erp_action->port->wwpn);
2732  out:
2733         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2734                                 lock_flags);
2735         return retval;
2736 }
2737
2738 /*
2739  * function:    zfcp_fsf_close_physical_port_handler
2740  *
2741  * purpose:     is called for finished Close Physical Port FSF command
2742  *
2743  * returns:
2744  */
2745 static int
2746 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2747 {
2748         int retval = -EINVAL;
2749         struct zfcp_port *port;
2750         struct zfcp_unit *unit;
2751         struct fsf_qtcb_header *header;
2752         u16 subtable, rule, counter;
2753
2754         port = (struct zfcp_port *) fsf_req->data;
2755         header = &fsf_req->qtcb->header;
2756
2757         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2758                 /* don't change port status in our bookkeeping */
2759                 goto skip_fsfstatus;
2760         }
2761
2762         /* evaluate FSF status in QTCB */
2763         switch (header->fsf_status) {
2764
2765         case FSF_PORT_HANDLE_NOT_VALID:
2766                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2767                               "(adapter %s, port 0x%016Lx). "
2768                               "This may happen occasionally.\n",
2769                               port->handle,
2770                               zfcp_get_busid_by_port(port),
2771                               port->wwpn);
2772                 ZFCP_LOG_DEBUG("status qualifier:\n");
2773                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2774                               (char *) &header->fsf_status_qual,
2775                               sizeof (union fsf_status_qual));
2776                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2777                                  "fsf_s_phand_nv");
2778                 zfcp_erp_adapter_reopen(port->adapter, 0);
2779                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2780                 break;
2781
2782         case FSF_ACCESS_DENIED:
2783                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2784                                 "physical port 0x%016Lx on adapter %s\n",
2785                                 port->wwpn, zfcp_get_busid_by_port(port));
2786                 for (counter = 0; counter < 2; counter++) {
2787                         subtable = header->fsf_status_qual.halfword[counter * 2];
2788                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2789                         switch (subtable) {
2790                         case FSF_SQ_CFDC_SUBTABLE_OS:
2791                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2792                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2793                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2794                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2795                                         zfcp_act_subtable_type[subtable], rule);
2796                                 break;
2797                         }
2798                 }
2799                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2800                 zfcp_erp_port_access_denied(port);
2801                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2802                 break;
2803
2804         case FSF_PORT_BOXED:
2805                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2806                                "%s needs to be reopened but it was attempted "
2807                                "to close it physically.\n",
2808                                port->wwpn,
2809                                zfcp_get_busid_by_port(port));
2810                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_pboxed");
2811                 zfcp_erp_port_boxed(port);
2812                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2813                         ZFCP_STATUS_FSFREQ_RETRY;
2814                 break;
2815
2816         case FSF_ADAPTER_STATUS_AVAILABLE:
2817                 switch (header->fsf_status_qual.word[0]) {
2818                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2819                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2820                                          "fsf_sq_ltest");
2821                         /* This will now be escalated by ERP */
2822                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2823                         break;
2824                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2825                         /* ERP strategy will escalate */
2826                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2827                                          "fsf_sq_ulp");
2828                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2829                         break;
2830                 default:
2831                         ZFCP_LOG_NORMAL
2832                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2833                              header->fsf_status_qual.word[0]);
2834                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2835                                          "fsf_sq_inval:");
2836                         debug_exception(
2837                                 fsf_req->adapter->erp_dbf, 0,
2838                                 &header->fsf_status_qual.word[0], sizeof (u32));
2839                         break;
2840                 }
2841                 break;
2842
2843         case FSF_GOOD:
2844                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2845                                "physically closed, port handle 0x%x\n",
2846                                port->wwpn,
2847                                zfcp_get_busid_by_port(port), port->handle);
2848                 /* can't use generic zfcp_erp_modify_port_status because
2849                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2850                  */
2851                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2852                 list_for_each_entry(unit, &port->unit_list_head, list)
2853                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2854                 retval = 0;
2855                 break;
2856
2857         default:
2858                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2859                                 "(debug info 0x%x)\n",
2860                                 header->fsf_status);
2861                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2862                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2863                                 &header->fsf_status, sizeof (u32));
2864                 break;
2865         }
2866
2867  skip_fsfstatus:
2868         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2869         return retval;
2870 }
2871
2872 /*
2873  * function:    zfcp_fsf_open_unit
2874  *
2875  * purpose:
2876  *
2877  * returns:
2878  *
2879  * assumptions: This routine does not check whether the associated
2880  *              remote port has already been opened. This should be
2881  *              done by calling routines. Otherwise some status
2882  *              may be presented by FSF
2883  */
2884 int
2885 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2886 {
2887         volatile struct qdio_buffer_element *sbale;
2888         unsigned long lock_flags;
2889         int retval = 0;
2890
2891         /* setup new FSF request */
2892         retval = zfcp_fsf_req_create(erp_action->adapter,
2893                                      FSF_QTCB_OPEN_LUN,
2894                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2895                                      erp_action->adapter->pool.fsf_req_erp,
2896                                      &lock_flags, &(erp_action->fsf_req));
2897         if (retval < 0) {
2898                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2899                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2900                               erp_action->unit->fcp_lun,
2901                               erp_action->unit->port->wwpn,
2902                               zfcp_get_busid_by_adapter(erp_action->adapter));
2903                 goto out;
2904         }
2905
2906         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2907                                     erp_action->fsf_req->sbal_curr, 0);
2908         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2909         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2910
2911         erp_action->fsf_req->qtcb->header.port_handle =
2912                 erp_action->port->handle;
2913         erp_action->fsf_req->qtcb->bottom.support.fcp_lun =
2914                 erp_action->unit->fcp_lun;
2915         erp_action->fsf_req->qtcb->bottom.support.option =
2916                 FSF_OPEN_LUN_SUPPRESS_BOXING;
2917         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2918         erp_action->fsf_req->data = (unsigned long) erp_action->unit;
2919         erp_action->fsf_req->erp_action = erp_action;
2920
2921         /* start QDIO request for this FSF request */
2922         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2923         if (retval) {
2924                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2925                               "on the adapter %s, port 0x%016Lx for "
2926                               "unit 0x%016Lx\n",
2927                               zfcp_get_busid_by_adapter(erp_action->adapter),
2928                               erp_action->port->wwpn,
2929                               erp_action->unit->fcp_lun);
2930                 zfcp_fsf_req_free(erp_action->fsf_req);
2931                 erp_action->fsf_req = NULL;
2932                 goto out;
2933         }
2934
2935         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2936                        "port 0x%016Lx, unit 0x%016Lx)\n",
2937                        zfcp_get_busid_by_adapter(erp_action->adapter),
2938                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2939  out:
2940         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2941                                 lock_flags);
2942         return retval;
2943 }
2944
2945 /*
2946  * function:    zfcp_fsf_open_unit_handler
2947  *
2948  * purpose:     is called for finished Open LUN command
2949  *
2950  * returns:
2951  */
2952 static int
2953 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2954 {
2955         int retval = -EINVAL;
2956         struct zfcp_adapter *adapter;
2957         struct zfcp_unit *unit;
2958         struct fsf_qtcb_header *header;
2959         struct fsf_qtcb_bottom_support *bottom;
2960         struct fsf_queue_designator *queue_designator;
2961         u16 subtable, rule, counter;
2962         u32 allowed, exclusive, readwrite;
2963
2964         unit = (struct zfcp_unit *) fsf_req->data;
2965
2966         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2967                 /* don't change unit status in our bookkeeping */
2968                 goto skip_fsfstatus;
2969         }
2970
2971         adapter = fsf_req->adapter;
2972         header = &fsf_req->qtcb->header;
2973         bottom = &fsf_req->qtcb->bottom.support;
2974         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
2975
2976         allowed   = bottom->lun_access_info & FSF_UNIT_ACCESS_OPEN_LUN_ALLOWED;
2977         exclusive = bottom->lun_access_info & FSF_UNIT_ACCESS_EXCLUSIVE;
2978         readwrite = bottom->lun_access_info & FSF_UNIT_ACCESS_OUTBOUND_TRANSFER;
2979
2980         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2981                           ZFCP_STATUS_UNIT_SHARED |
2982                           ZFCP_STATUS_UNIT_READONLY,
2983                           &unit->status);
2984
2985         /* evaluate FSF status in QTCB */
2986         switch (header->fsf_status) {
2987
2988         case FSF_PORT_HANDLE_NOT_VALID:
2989                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
2990                               "for port 0x%016Lx on adapter %s invalid "
2991                               "This may happen occasionally\n",
2992                               unit->port->handle,
2993                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
2994                 ZFCP_LOG_DEBUG("status qualifier:\n");
2995                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2996                               (char *) &header->fsf_status_qual,
2997                               sizeof (union fsf_status_qual));
2998                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_ph_nv");
2999                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3000                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3001                 break;
3002
3003         case FSF_LUN_ALREADY_OPEN:
3004                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3005                                 "remote port 0x%016Lx on adapter %s twice.\n",
3006                                 unit->fcp_lun,
3007                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3008                 debug_text_exception(adapter->erp_dbf, 0,
3009                                      "fsf_s_uopen");
3010                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3011                 break;
3012
3013         case FSF_ACCESS_DENIED:
3014                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3015                                 "remote port 0x%016Lx on adapter %s\n",
3016                                 unit->fcp_lun, unit->port->wwpn,
3017                                 zfcp_get_busid_by_unit(unit));
3018                 for (counter = 0; counter < 2; counter++) {
3019                         subtable = header->fsf_status_qual.halfword[counter * 2];
3020                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3021                         switch (subtable) {
3022                         case FSF_SQ_CFDC_SUBTABLE_OS:
3023                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3024                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3025                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3026                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3027                                         zfcp_act_subtable_type[subtable], rule);
3028                                 break;
3029                         }
3030                 }
3031                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
3032                 zfcp_erp_unit_access_denied(unit);
3033                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3034                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3035                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3036                 break;
3037
3038         case FSF_PORT_BOXED:
3039                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3040                                "needs to be reopened\n",
3041                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3042                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
3043                 zfcp_erp_port_boxed(unit->port);
3044                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3045                         ZFCP_STATUS_FSFREQ_RETRY;
3046                 break;
3047
3048         case FSF_LUN_SHARING_VIOLATION:
3049                 if (header->fsf_status_qual.word[0] != 0) {
3050                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3051                                         "with WWPN 0x%Lx "
3052                                         "connected to the adapter %s "
3053                                         "is already in use in LPAR%d, CSS%d\n",
3054                                         unit->fcp_lun,
3055                                         unit->port->wwpn,
3056                                         zfcp_get_busid_by_unit(unit),
3057                                         queue_designator->hla,
3058                                         queue_designator->cssid);
3059                 } else {
3060                         subtable = header->fsf_status_qual.halfword[4];
3061                         rule = header->fsf_status_qual.halfword[5];
3062                         switch (subtable) {
3063                         case FSF_SQ_CFDC_SUBTABLE_OS:
3064                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3065                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3066                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3067                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3068                                                 "remote port with WWPN 0x%Lx "
3069                                                 "connected to the adapter %s "
3070                                                 "is denied (%s rule %d)\n",
3071                                                 unit->fcp_lun,
3072                                                 unit->port->wwpn,
3073                                                 zfcp_get_busid_by_unit(unit),
3074                                                 zfcp_act_subtable_type[subtable],
3075                                                 rule);
3076                                 break;
3077                         }
3078                 }
3079                 ZFCP_LOG_DEBUG("status qualifier:\n");
3080                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3081                               (char *) &header->fsf_status_qual,
3082                               sizeof (union fsf_status_qual));
3083                 debug_text_event(adapter->erp_dbf, 2,
3084                                  "fsf_s_l_sh_vio");
3085                 zfcp_erp_unit_access_denied(unit);
3086                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3087                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3088                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3089                 break;
3090
3091         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3092                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3093                               "There is no handle (temporary port identifier) "
3094                               "available for unit 0x%016Lx on port 0x%016Lx "
3095                               "on adapter %s\n",
3096                               unit->fcp_lun,
3097                               unit->port->wwpn,
3098                               zfcp_get_busid_by_unit(unit));
3099                 debug_text_event(adapter->erp_dbf, 1,
3100                                  "fsf_s_max_units");
3101                 zfcp_erp_unit_failed(unit);
3102                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3103                 break;
3104
3105         case FSF_ADAPTER_STATUS_AVAILABLE:
3106                 switch (header->fsf_status_qual.word[0]) {
3107                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3108                         /* Re-establish link to port */
3109                         debug_text_event(adapter->erp_dbf, 1,
3110                                          "fsf_sq_ltest");
3111                         zfcp_test_link(unit->port);
3112                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3113                         break;
3114                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3115                         /* ERP strategy will escalate */
3116                         debug_text_event(adapter->erp_dbf, 1,
3117                                          "fsf_sq_ulp");
3118                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3119                         break;
3120                 default:
3121                         ZFCP_LOG_NORMAL
3122                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3123                              header->fsf_status_qual.word[0]);
3124                         debug_text_event(adapter->erp_dbf, 0,
3125                                          "fsf_sq_inval:");
3126                         debug_exception(adapter->erp_dbf, 0,
3127                                         &header->fsf_status_qual.word[0],
3128                                 sizeof (u32));
3129                 }
3130                 break;
3131
3132         case FSF_INVALID_COMMAND_OPTION:
3133                 ZFCP_LOG_NORMAL(
3134                         "Invalid option 0x%x has been specified "
3135                         "in QTCB bottom sent to the adapter %s\n",
3136                         bottom->option,
3137                         zfcp_get_busid_by_adapter(adapter));
3138                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3139                 retval = -EINVAL;
3140                 break;
3141
3142         case FSF_GOOD:
3143                 /* save LUN handle assigned by FSF */
3144                 unit->handle = header->lun_handle;
3145                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3146                                "adapter %s opened, port handle 0x%x\n",
3147                                unit->fcp_lun,
3148                                unit->port->wwpn,
3149                                zfcp_get_busid_by_unit(unit),
3150                                unit->handle);
3151                 /* mark unit as open */
3152                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3153                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
3154                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
3155                                   &unit->status);
3156                 if (adapter->supported_features & FSF_FEATURE_LUN_SHARING){
3157                         if (!exclusive)
3158                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3159                                                 &unit->status);
3160
3161                         if (!readwrite) {
3162                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3163                                                 &unit->status);
3164                                 ZFCP_LOG_NORMAL("read-only access for unit "
3165                                                 "(adapter %s, wwpn=0x%016Lx, "
3166                                                 "fcp_lun=0x%016Lx)\n",
3167                                                 zfcp_get_busid_by_unit(unit),
3168                                                 unit->port->wwpn,
3169                                                 unit->fcp_lun);
3170                         }
3171
3172                         if (exclusive && !readwrite) {
3173                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3174                                                 "unit not supported\n");
3175                                 zfcp_erp_unit_failed(unit);
3176                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3177                                 zfcp_erp_unit_shutdown(unit, 0);
3178                         } else if (!exclusive && readwrite) {
3179                                 ZFCP_LOG_NORMAL("shared access of read-write "
3180                                                 "unit not supported\n");
3181                                 zfcp_erp_unit_failed(unit);
3182                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3183                                 zfcp_erp_unit_shutdown(unit, 0);
3184                         }
3185                 }
3186
3187                 retval = 0;
3188                 break;
3189
3190         default:
3191                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3192                                 "(debug info 0x%x)\n",
3193                                 header->fsf_status);
3194                 debug_text_event(adapter->erp_dbf, 0, "fsf_s_inval:");
3195                 debug_exception(adapter->erp_dbf, 0,
3196                                 &header->fsf_status, sizeof (u32));
3197                 break;
3198         }
3199
3200  skip_fsfstatus:
3201         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3202         return retval;
3203 }
3204
3205 /*
3206  * function:    zfcp_fsf_close_unit
3207  *
3208  * purpose:
3209  *
3210  * returns:     address of fsf_req - request successfully initiated
3211  *              NULL -
3212  *
3213  * assumptions: This routine does not check whether the associated
3214  *              remote port/lun has already been opened. This should be
3215  *              done by calling routines. Otherwise some status
3216  *              may be presented by FSF
3217  */
3218 int
3219 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3220 {
3221         volatile struct qdio_buffer_element *sbale;
3222         unsigned long lock_flags;
3223         int retval = 0;
3224
3225         /* setup new FSF request */
3226         retval = zfcp_fsf_req_create(erp_action->adapter,
3227                                      FSF_QTCB_CLOSE_LUN,
3228                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3229                                      erp_action->adapter->pool.fsf_req_erp,
3230                                      &lock_flags, &(erp_action->fsf_req));
3231         if (retval < 0) {
3232                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3233                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3234                               erp_action->unit->fcp_lun,
3235                               erp_action->port->wwpn,
3236                               zfcp_get_busid_by_adapter(erp_action->adapter));
3237                 goto out;
3238         }
3239
3240         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
3241                                     erp_action->fsf_req->sbal_curr, 0);
3242         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3243         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3244
3245         erp_action->fsf_req->qtcb->header.port_handle =
3246             erp_action->port->handle;
3247         erp_action->fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3248         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3249         erp_action->fsf_req->data = (unsigned long) erp_action->unit;
3250         erp_action->fsf_req->erp_action = erp_action;
3251
3252         /* start QDIO request for this FSF request */
3253         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
3254         if (retval) {
3255                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3256                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3257                               erp_action->unit->fcp_lun,
3258                               erp_action->port->wwpn,
3259                               zfcp_get_busid_by_adapter(erp_action->adapter));
3260                 zfcp_fsf_req_free(erp_action->fsf_req);
3261                 erp_action->fsf_req = NULL;
3262                 goto out;
3263         }
3264
3265         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3266                        "port 0x%016Lx, unit 0x%016Lx)\n",
3267                        zfcp_get_busid_by_adapter(erp_action->adapter),
3268                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3269  out:
3270         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3271                                 lock_flags);
3272         return retval;
3273 }
3274
3275 /*
3276  * function:    zfcp_fsf_close_unit_handler
3277  *
3278  * purpose:     is called for finished Close LUN FSF command
3279  *
3280  * returns:
3281  */
3282 static int
3283 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3284 {
3285         int retval = -EINVAL;
3286         struct zfcp_unit *unit;
3287
3288         unit = (struct zfcp_unit *) fsf_req->data;
3289
3290         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3291                 /* don't change unit status in our bookkeeping */
3292                 goto skip_fsfstatus;
3293         }
3294
3295         /* evaluate FSF status in QTCB */
3296         switch (fsf_req->qtcb->header.fsf_status) {
3297
3298         case FSF_PORT_HANDLE_NOT_VALID:
3299                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3300                               "0x%016Lx on adapter %s invalid. This may "
3301                               "happen in rare circumstances\n",
3302                               unit->port->handle,
3303                               unit->port->wwpn,
3304                               zfcp_get_busid_by_unit(unit));
3305                 ZFCP_LOG_DEBUG("status qualifier:\n");
3306                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3307                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3308                               sizeof (union fsf_status_qual));
3309                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3310                                  "fsf_s_phand_nv");
3311                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3312                 zfcp_cmd_dbf_event_fsf("porthinv", fsf_req,
3313                                        &fsf_req->qtcb->header.fsf_status_qual,
3314                                        sizeof (union fsf_status_qual));
3315                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3316                 break;
3317
3318         case FSF_LUN_HANDLE_NOT_VALID:
3319                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3320                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3321                               "invalid. This may happen occasionally.\n",
3322                               unit->handle,
3323                               unit->fcp_lun,
3324                               unit->port->wwpn,
3325                               zfcp_get_busid_by_unit(unit));
3326                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3327                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3328                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3329                               sizeof (union fsf_status_qual));
3330                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3331                                  "fsf_s_lhand_nv");
3332                 zfcp_erp_port_reopen(unit->port, 0);
3333                 zfcp_cmd_dbf_event_fsf("lunhinv", fsf_req,
3334                                        &fsf_req->qtcb->header.fsf_status_qual,
3335                                        sizeof (union fsf_status_qual));
3336                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3337                 break;
3338
3339         case FSF_PORT_BOXED:
3340                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3341                                "needs to be reopened\n",
3342                                unit->port->wwpn,
3343                                zfcp_get_busid_by_unit(unit));
3344                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3345                 zfcp_erp_port_boxed(unit->port);
3346                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3347                         ZFCP_STATUS_FSFREQ_RETRY;
3348                 break;
3349
3350         case FSF_ADAPTER_STATUS_AVAILABLE:
3351                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3352                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3353                         /* re-establish link to port */
3354                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3355                                          "fsf_sq_ltest");
3356                         zfcp_test_link(unit->port);
3357                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3358                         break;
3359                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3360                         /* ERP strategy will escalate */
3361                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3362                                          "fsf_sq_ulp");
3363                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3364                         break;
3365                 default:
3366                         ZFCP_LOG_NORMAL
3367                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3368                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3369                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3370                                          "fsf_sq_inval:");
3371                         debug_exception(
3372                                 fsf_req->adapter->erp_dbf, 0,
3373                                 &fsf_req->qtcb->header.fsf_status_qual.word[0],
3374                                 sizeof (u32));
3375                         break;
3376                 }
3377                 break;
3378
3379         case FSF_GOOD:
3380                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3381                                "closed, port handle 0x%x\n",
3382                                unit->fcp_lun,
3383                                unit->port->wwpn,
3384                                zfcp_get_busid_by_unit(unit),
3385                                unit->handle);
3386                 /* mark unit as closed */
3387                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3388                 retval = 0;
3389                 break;
3390
3391         default:
3392                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3393                                 "(debug info 0x%x)\n",
3394                                 fsf_req->qtcb->header.fsf_status);
3395                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3396                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3397                                 &fsf_req->qtcb->header.fsf_status,
3398                                 sizeof (u32));
3399                 break;
3400         }
3401
3402  skip_fsfstatus:
3403         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3404         return retval;
3405 }
3406
3407 /**
3408  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3409  * @adapter: adapter where scsi command is issued
3410  * @unit: unit where command is sent to
3411  * @scsi_cmnd: scsi command to be sent
3412  * @timer: timer to be started when request is initiated
3413  * @req_flags: flags for fsf_request
3414  */
3415 int
3416 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3417                                struct zfcp_unit *unit,
3418                                struct scsi_cmnd * scsi_cmnd,
3419                                struct timer_list *timer, int req_flags)
3420 {
3421         struct zfcp_fsf_req *fsf_req = NULL;
3422         struct fcp_cmnd_iu *fcp_cmnd_iu;
3423         unsigned int sbtype;
3424         unsigned long lock_flags;
3425         int real_bytes = 0;
3426         int retval = 0;
3427         int mask;
3428
3429         /* setup new FSF request */
3430         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3431                                      adapter->pool.fsf_req_scsi,
3432                                      &lock_flags, &fsf_req);
3433         if (unlikely(retval < 0)) {
3434                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3435                                "for unit 0x%016Lx on port 0x%016Lx on "
3436                                "adapter %s\n",
3437                                unit->fcp_lun,
3438                                unit->port->wwpn,
3439                                zfcp_get_busid_by_adapter(adapter));
3440                 goto failed_req_create;
3441         }
3442
3443         zfcp_unit_get(unit);
3444         fsf_req->unit = unit;
3445
3446         /* associate FSF request with SCSI request (for look up on abort) */
3447         scsi_cmnd->host_scribble = (char *) fsf_req;
3448
3449         /* associate SCSI command with FSF request */
3450         fsf_req->data = (unsigned long) scsi_cmnd;
3451
3452         /* set handles of unit and its parent port in QTCB */
3453         fsf_req->qtcb->header.lun_handle = unit->handle;
3454         fsf_req->qtcb->header.port_handle = unit->port->handle;
3455
3456         /* FSF does not define the structure of the FCP_CMND IU */
3457         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3458             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3459
3460         /*
3461          * set depending on data direction:
3462          *      data direction bits in SBALE (SB Type)
3463          *      data direction bits in QTCB
3464          *      data direction bits in FCP_CMND IU
3465          */
3466         switch (scsi_cmnd->sc_data_direction) {
3467         case DMA_NONE:
3468                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3469                 /*
3470                  * FIXME(qdio):
3471                  * what is the correct type for commands
3472                  * without 'real' data buffers?
3473                  */
3474                 sbtype = SBAL_FLAGS0_TYPE_READ;
3475                 break;
3476         case DMA_FROM_DEVICE:
3477                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3478                 sbtype = SBAL_FLAGS0_TYPE_READ;
3479                 fcp_cmnd_iu->rddata = 1;
3480                 break;
3481         case DMA_TO_DEVICE:
3482                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3483                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3484                 fcp_cmnd_iu->wddata = 1;
3485                 break;
3486         case DMA_BIDIRECTIONAL:
3487         default:
3488                 /*
3489                  * dummy, catch this condition earlier
3490                  * in zfcp_scsi_queuecommand
3491                  */
3492                 goto failed_scsi_cmnd;
3493         }
3494
3495         /* set FC service class in QTCB (3 per default) */
3496         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3497
3498         /* set FCP_LUN in FCP_CMND IU in QTCB */
3499         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3500
3501         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3502
3503         /* set task attributes in FCP_CMND IU in QTCB */
3504         if (likely((scsi_cmnd->device->simple_tags) ||
3505                    (atomic_test_mask(mask, &unit->status))))
3506                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3507         else
3508                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3509
3510         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3511         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3512                 fcp_cmnd_iu->add_fcp_cdb_length
3513                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3514                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3515                                "additional FCP_CDB length is 0x%x "
3516                                "(shifted right 2 bits)\n",
3517                                scsi_cmnd->cmd_len,
3518                                fcp_cmnd_iu->add_fcp_cdb_length);
3519         }
3520         /*
3521          * copy SCSI CDB (including additional length, if any) to
3522          * FCP_CDB in FCP_CMND IU in QTCB
3523          */
3524         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3525
3526         /* FCP CMND IU length in QTCB */
3527         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3528                 sizeof (struct fcp_cmnd_iu) +
3529                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3530
3531         /* generate SBALEs from data buffer */
3532         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3533         if (unlikely(real_bytes < 0)) {
3534                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3535                         ZFCP_LOG_DEBUG(
3536                                 "Data did not fit into available buffer(s), "
3537                                "waiting for more...\n");
3538                 retval = -EIO;
3539         } else {
3540                 ZFCP_LOG_NORMAL("error: No truncation implemented but "
3541                                 "required. Shutting down unit "
3542                                 "(adapter %s, port 0x%016Lx, "
3543                                 "unit 0x%016Lx)\n",
3544                                 zfcp_get_busid_by_unit(unit),
3545                                 unit->port->wwpn,
3546                                 unit->fcp_lun);
3547                 zfcp_erp_unit_shutdown(unit, 0);
3548                 retval = -EINVAL;
3549                 }
3550                 goto no_fit;
3551         }
3552
3553         /* set length of FCP data length in FCP_CMND IU in QTCB */
3554         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3555
3556         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3557         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3558                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3559
3560         /*
3561          * start QDIO request for this FSF request
3562          *  covered by an SBALE)
3563          */
3564         retval = zfcp_fsf_req_send(fsf_req, timer);
3565         if (unlikely(retval < 0)) {
3566                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3567                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3568                               zfcp_get_busid_by_adapter(adapter),
3569                               unit->port->wwpn,
3570                               unit->fcp_lun);
3571                 goto send_failed;
3572         }
3573
3574         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3575                        "port 0x%016Lx, unit 0x%016Lx)\n",
3576                        zfcp_get_busid_by_adapter(adapter),
3577                        unit->port->wwpn,
3578                        unit->fcp_lun);
3579         goto success;
3580
3581  send_failed:
3582  no_fit:
3583  failed_scsi_cmnd:
3584         zfcp_unit_put(unit);
3585         zfcp_fsf_req_free(fsf_req);
3586         fsf_req = NULL;
3587         scsi_cmnd->host_scribble = NULL;
3588  success:
3589  failed_req_create:
3590         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3591         return retval;
3592 }
3593
3594 /*
3595  * function:    zfcp_fsf_send_fcp_command_task_management
3596  *
3597  * purpose:
3598  *
3599  * returns:
3600  *
3601  * FIXME(design): should be watched by a timeout!!!
3602  * FIXME(design) shouldn't this be modified to return an int
3603  *               also...don't know how though
3604  *
3605  */
3606 struct zfcp_fsf_req *
3607 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3608                                           struct zfcp_unit *unit,
3609                                           u8 tm_flags, int req_flags)
3610 {
3611         struct zfcp_fsf_req *fsf_req = NULL;
3612         int retval = 0;
3613         struct fcp_cmnd_iu *fcp_cmnd_iu;
3614         unsigned long lock_flags;
3615         volatile struct qdio_buffer_element *sbale;
3616
3617         /* setup new FSF request */
3618         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3619                                      adapter->pool.fsf_req_scsi,
3620                                      &lock_flags, &fsf_req);
3621         if (retval < 0) {
3622                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3623                               "management) request for adapter %s, port "
3624                               " 0x%016Lx, unit 0x%016Lx.\n",
3625                               zfcp_get_busid_by_adapter(adapter),
3626                               unit->port->wwpn, unit->fcp_lun);
3627                 goto out;
3628         }
3629
3630         /*
3631          * Used to decide on proper handler in the return path,
3632          * could be either zfcp_fsf_send_fcp_command_task_handler or
3633          * zfcp_fsf_send_fcp_command_task_management_handler */
3634
3635         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3636
3637         /*
3638          * hold a pointer to the unit being target of this
3639          * task management request
3640          */
3641         fsf_req->data = (unsigned long) unit;
3642
3643         /* set FSF related fields in QTCB */
3644         fsf_req->qtcb->header.lun_handle = unit->handle;
3645         fsf_req->qtcb->header.port_handle = unit->port->handle;
3646         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3647         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3648         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3649                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3650
3651         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3652         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3653         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3654
3655         /* set FCP related fields in FCP_CMND IU in QTCB */
3656         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3657                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3658         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3659         fcp_cmnd_iu->task_management_flags = tm_flags;
3660
3661         /* start QDIO request for this FSF request */
3662         zfcp_fsf_start_scsi_er_timer(adapter);
3663         retval = zfcp_fsf_req_send(fsf_req, NULL);
3664         if (retval) {
3665                 del_timer(&adapter->scsi_er_timer);
3666                 ZFCP_LOG_INFO("error: Could not send an FCP-command (task "
3667                               "management) on adapter %s, port 0x%016Lx for "
3668                               "unit LUN 0x%016Lx\n",
3669                               zfcp_get_busid_by_adapter(adapter),
3670                               unit->port->wwpn,
3671                               unit->fcp_lun);
3672                 zfcp_fsf_req_free(fsf_req);
3673                 fsf_req = NULL;
3674                 goto out;
3675         }
3676
3677         ZFCP_LOG_TRACE("Send FCP Command (task management function) initiated "
3678                        "(adapter %s, port 0x%016Lx, unit 0x%016Lx, "
3679                        "tm_flags=0x%x)\n",
3680                        zfcp_get_busid_by_adapter(adapter),
3681                        unit->port->wwpn,
3682                        unit->fcp_lun,
3683                        tm_flags);
3684  out:
3685         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3686         return fsf_req;
3687 }
3688
3689 /*
3690  * function:    zfcp_fsf_send_fcp_command_handler
3691  *
3692  * purpose:     is called for finished Send FCP Command
3693  *
3694  * returns:
3695  */
3696 static int
3697 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3698 {
3699         int retval = -EINVAL;
3700         struct zfcp_unit *unit;
3701         struct fsf_qtcb_header *header;
3702         u16 subtable, rule, counter;
3703
3704         header = &fsf_req->qtcb->header;
3705
3706         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3707                 unit = (struct zfcp_unit *) fsf_req->data;
3708         else
3709                 unit = fsf_req->unit;
3710
3711         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3712                 /* go directly to calls of special handlers */
3713                 goto skip_fsfstatus;
3714         }
3715
3716         /* evaluate FSF status in QTCB */
3717         switch (header->fsf_status) {
3718
3719         case FSF_PORT_HANDLE_NOT_VALID:
3720                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3721                               "0x%016Lx on adapter %s invalid\n",
3722                               unit->port->handle,
3723                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3724                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3725                               (char *) &header->fsf_status_qual,
3726                               sizeof (union fsf_status_qual));
3727                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3728                                  "fsf_s_phand_nv");
3729                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3730                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3731                 break;
3732
3733         case FSF_LUN_HANDLE_NOT_VALID:
3734                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3735                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3736                               "invalid. This may happen occasionally.\n",
3737                               unit->handle,
3738                               unit->fcp_lun,
3739                               unit->port->wwpn,
3740                               zfcp_get_busid_by_unit(unit));
3741                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3742                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3743                               (char *) &header->fsf_status_qual,
3744                               sizeof (union fsf_status_qual));
3745                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3746                                  "fsf_s_uhand_nv");
3747                 zfcp_erp_port_reopen(unit->port, 0);
3748                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3749                 break;
3750
3751         case FSF_HANDLE_MISMATCH:
3752                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3753                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3754                                 "unit 0x%016Lx)\n",
3755                                 unit->port->handle,
3756                                 zfcp_get_busid_by_unit(unit),
3757                                 unit->port->wwpn,
3758                                 unit->fcp_lun);
3759                 ZFCP_LOG_NORMAL("status qualifier:\n");
3760                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3761                               (char *) &header->fsf_status_qual,
3762                               sizeof (union fsf_status_qual));
3763                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3764                                  "fsf_s_hand_mis");
3765                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3766                 zfcp_cmd_dbf_event_fsf("handmism",
3767                                        fsf_req,
3768                                        &header->fsf_status_qual,
3769                                        sizeof (union fsf_status_qual));
3770                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3771                 break;
3772
3773         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3774                 if (fsf_req->adapter->fc_service_class <= 3) {
3775                         ZFCP_LOG_NORMAL("error: The adapter %s does "
3776                                         "not support fibrechannel class %d.\n",
3777                                         zfcp_get_busid_by_unit(unit),
3778                                         fsf_req->adapter->fc_service_class);
3779                 } else {
3780                         ZFCP_LOG_NORMAL("bug: The fibrechannel class at "
3781                                         "adapter %s is invalid. "
3782                                         "(debug info %d)\n",
3783                                         zfcp_get_busid_by_unit(unit),
3784                                         fsf_req->adapter->fc_service_class);
3785                 }
3786                 /* stop operation for this adapter */
3787                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
3788                                      "fsf_s_class_nsup");
3789                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3790                 zfcp_cmd_dbf_event_fsf("unsclass",
3791                                        fsf_req,
3792                                        &header->fsf_status_qual,
3793                                        sizeof (union fsf_status_qual));
3794                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3795                 break;
3796
3797         case FSF_FCPLUN_NOT_VALID:
3798                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3799                                 "adapter %s does not have correct unit "
3800                                 "handle 0x%x\n",
3801                                 unit->fcp_lun,
3802                                 unit->port->wwpn,
3803                                 zfcp_get_busid_by_unit(unit),
3804                                 unit->handle);
3805                 ZFCP_LOG_DEBUG("status qualifier:\n");
3806                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3807                               (char *) &header->fsf_status_qual,
3808                               sizeof (union fsf_status_qual));
3809                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3810                                  "fsf_s_fcp_lun_nv");
3811                 zfcp_erp_port_reopen(unit->port, 0);
3812                 zfcp_cmd_dbf_event_fsf("fluninv",
3813                                        fsf_req,
3814                                        &header->fsf_status_qual,
3815                                        sizeof (union fsf_status_qual));
3816                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3817                 break;
3818
3819         case FSF_ACCESS_DENIED:
3820                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3821                                 "unit 0x%016Lx on port 0x%016Lx on "
3822                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3823                                 zfcp_get_busid_by_unit(unit));
3824                 for (counter = 0; counter < 2; counter++) {
3825                         subtable = header->fsf_status_qual.halfword[counter * 2];
3826                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3827                         switch (subtable) {
3828                         case FSF_SQ_CFDC_SUBTABLE_OS:
3829                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3830                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3831                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3832                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3833                                         zfcp_act_subtable_type[subtable], rule);
3834                                 break;
3835                         }
3836                 }
3837                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
3838                 zfcp_erp_unit_access_denied(unit);
3839                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3840                 break;
3841
3842         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3843                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3844                               "0x%016Lx on port 0x%016Lx on adapter %s "
3845                               "(debug info %d)\n",
3846                               unit->fcp_lun,
3847                               unit->port->wwpn,
3848                               zfcp_get_busid_by_unit(unit),
3849                               fsf_req->qtcb->bottom.io.data_direction);
3850                 /* stop operation for this adapter */
3851                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3852                                  "fsf_s_dir_ind_nv");
3853                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3854                 zfcp_cmd_dbf_event_fsf("dirinv",
3855                                        fsf_req,
3856                                        &header->fsf_status_qual,
3857                                        sizeof (union fsf_status_qual));
3858                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3859                 break;
3860
3861         case FSF_CMND_LENGTH_NOT_VALID:
3862                 ZFCP_LOG_NORMAL
3863                     ("bug: An invalid control-data-block length field "
3864                      "was found in a command for unit 0x%016Lx on port "
3865                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3866                      unit->fcp_lun, unit->port->wwpn,
3867                      zfcp_get_busid_by_unit(unit),
3868                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3869                 /* stop operation for this adapter */
3870                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3871                                  "fsf_s_cmd_len_nv");
3872                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3873                 zfcp_cmd_dbf_event_fsf("cleninv",
3874                                        fsf_req,
3875                                        &header->fsf_status_qual,
3876                                        sizeof (union fsf_status_qual));
3877                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3878                 break;
3879
3880         case FSF_PORT_BOXED:
3881                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3882                                "needs to be reopened\n",
3883                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3884                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3885                 zfcp_erp_port_boxed(unit->port);
3886                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3887                         ZFCP_STATUS_FSFREQ_RETRY;
3888                 break;
3889
3890         case FSF_LUN_BOXED:
3891                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3892                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3893                                 zfcp_get_busid_by_unit(unit),
3894                                 unit->port->wwpn, unit->fcp_lun);
3895                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
3896                 zfcp_erp_unit_boxed(unit);
3897                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3898                         | ZFCP_STATUS_FSFREQ_RETRY;
3899                 break;
3900
3901         case FSF_ADAPTER_STATUS_AVAILABLE:
3902                 switch (header->fsf_status_qual.word[0]) {
3903                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3904                         /* re-establish link to port */
3905                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3906                                          "fsf_sq_ltest");
3907                         zfcp_test_link(unit->port);
3908                         break;
3909                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3910                         /* FIXME(hw) need proper specs for proper action */
3911                         /* let scsi stack deal with retries and escalation */
3912                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3913                                          "fsf_sq_ulp");
3914                         break;
3915                 default:
3916                         ZFCP_LOG_NORMAL
3917                             ("Unknown status qualifier 0x%x arrived.\n",
3918                              header->fsf_status_qual.word[0]);
3919                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3920                                          "fsf_sq_inval:");
3921                         debug_exception(fsf_req->adapter->erp_dbf, 0,
3922                                         &header->fsf_status_qual.word[0],
3923                                         sizeof(u32));
3924                         break;
3925                 }
3926                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3927                 break;
3928
3929         case FSF_GOOD:
3930                 break;
3931
3932         case FSF_FCP_RSP_AVAILABLE:
3933                 break;
3934
3935         default:
3936                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3937                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3938                                 &header->fsf_status, sizeof(u32));
3939                 break;
3940         }
3941
3942  skip_fsfstatus:
3943         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3944                 retval =
3945                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3946         } else {
3947                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3948                 fsf_req->unit = NULL;
3949                 zfcp_unit_put(unit);
3950         }
3951         return retval;
3952 }
3953
3954 /*
3955  * function:    zfcp_fsf_send_fcp_command_task_handler
3956  *
3957  * purpose:     evaluates FCP_RSP IU
3958  *
3959  * returns:
3960  */
3961 static int
3962 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3963 {
3964         int retval = 0;
3965         struct scsi_cmnd *scpnt;
3966         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3967             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3968         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3969             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3970         u32 sns_len;
3971         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3972         unsigned long flags;
3973         struct zfcp_unit *unit = fsf_req->unit;
3974
3975         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3976         scpnt = (struct scsi_cmnd *) fsf_req->data;
3977         if (unlikely(!scpnt)) {
3978                 ZFCP_LOG_DEBUG
3979                     ("Command with fsf_req %p is not associated to "
3980                      "a scsi command anymore. Aborted?\n", fsf_req);
3981                 goto out;
3982         }
3983         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3984                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3985                  *        DID_SOFT_ERROR by retrying the request for devices
3986                  *        that allow retries.
3987                  */
3988                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3989                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3990                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3991                 goto skip_fsfstatus;
3992         }
3993
3994         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3995                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3996                 set_host_byte(&scpnt->result, DID_ERROR);
3997                 goto skip_fsfstatus;
3998         }
3999
4000         /* set message byte of result in SCSI command */
4001         scpnt->result |= COMMAND_COMPLETE << 8;
4002
4003         /*
4004          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
4005          * of result in SCSI command
4006          */
4007         scpnt->result |= fcp_rsp_iu->scsi_status;
4008         if (unlikely(fcp_rsp_iu->scsi_status)) {
4009                 /* DEBUG */
4010                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
4011                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4012                               scpnt->cmnd, scpnt->cmd_len);
4013                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
4014                                 fcp_rsp_iu->scsi_status);
4015                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4016                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
4017                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4018                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
4019                               fcp_rsp_iu->fcp_sns_len);
4020         }
4021
4022         /* check FCP_RSP_INFO */
4023         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
4024                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
4025                 switch (fcp_rsp_info[3]) {
4026                 case RSP_CODE_GOOD:
4027                         /* ok, continue */
4028                         ZFCP_LOG_TRACE("no failure or Task Management "
4029                                        "Function complete\n");
4030                         set_host_byte(&scpnt->result, DID_OK);
4031                         break;
4032                 case RSP_CODE_LENGTH_MISMATCH:
4033                         /* hardware bug */
4034                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4035                                         "that the fibrechannel protocol data "
4036                                         "length differs from the burst length. "
4037                                         "The problem occured on unit 0x%016Lx "
4038                                         "on port 0x%016Lx on adapter %s",
4039                                         unit->fcp_lun,
4040                                         unit->port->wwpn,
4041                                         zfcp_get_busid_by_unit(unit));
4042                         /* dump SCSI CDB as prepared by zfcp */
4043                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4044                                       (char *) &fsf_req->qtcb->
4045                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4046                         zfcp_cmd_dbf_event_fsf("clenmis", fsf_req, NULL, 0);
4047                         set_host_byte(&scpnt->result, DID_ERROR);
4048                         goto skip_fsfstatus;
4049                 case RSP_CODE_FIELD_INVALID:
4050                         /* driver or hardware bug */
4051                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4052                                         "that the fibrechannel protocol data "
4053                                         "fields were incorrectly set up. "
4054                                         "The problem occured on the unit "
4055                                         "0x%016Lx on port 0x%016Lx on "
4056                                         "adapter %s",
4057                                         unit->fcp_lun,
4058                                         unit->port->wwpn,
4059                                         zfcp_get_busid_by_unit(unit));
4060                         /* dump SCSI CDB as prepared by zfcp */
4061                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4062                                       (char *) &fsf_req->qtcb->
4063                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4064                         set_host_byte(&scpnt->result, DID_ERROR);
4065                         zfcp_cmd_dbf_event_fsf("codeinv", fsf_req, NULL, 0);
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                         zfcp_cmd_dbf_event_fsf("codemism", fsf_req, NULL, 0);
4083                         set_host_byte(&scpnt->result, DID_ERROR);
4084                         goto skip_fsfstatus;
4085                 default:
4086                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4087                                         "code was detected for a command. "
4088                                         "The problem occured on the unit "
4089                                         "0x%016Lx on port 0x%016Lx on "
4090                                         "adapter %s (debug info 0x%x)\n",
4091                                         unit->fcp_lun,
4092                                         unit->port->wwpn,
4093                                         zfcp_get_busid_by_unit(unit),
4094                                         fcp_rsp_info[3]);
4095                         /* dump SCSI CDB as prepared by zfcp */
4096                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4097                                       (char *) &fsf_req->qtcb->
4098                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4099                         zfcp_cmd_dbf_event_fsf("undeffcp", fsf_req, NULL, 0);
4100                         set_host_byte(&scpnt->result, DID_ERROR);
4101                         goto skip_fsfstatus;
4102                 }
4103         }
4104
4105         /* check for sense data */
4106         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4107                 sns_len = FSF_FCP_RSP_SIZE -
4108                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4109                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4110                                sns_len);
4111                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4112                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4113                                SCSI_SENSE_BUFFERSIZE);
4114                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4115                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4116                                scpnt->result);
4117                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4118                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4119
4120                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4121                                fcp_rsp_iu->fcp_sns_len);
4122                 memcpy(&scpnt->sense_buffer,
4123                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4124                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4125                               (void *) &scpnt->sense_buffer, sns_len);
4126         }
4127
4128         /* check for overrun */
4129         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4130                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4131                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4132                               "The response data length is "
4133                               "%d, the original length was %d.\n",
4134                               unit->fcp_lun,
4135                               unit->port->wwpn,
4136                               zfcp_get_busid_by_unit(unit),
4137                               fcp_rsp_iu->fcp_resid,
4138                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4139         }
4140
4141         /* check for underrun */
4142         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4143                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4144                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4145                               "The response data length is "
4146                               "%d, the original length was %d.\n",
4147                               unit->fcp_lun,
4148                               unit->port->wwpn,
4149                               zfcp_get_busid_by_unit(unit),
4150                               fcp_rsp_iu->fcp_resid,
4151                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4152
4153                 scpnt->resid = fcp_rsp_iu->fcp_resid;
4154                 if (scpnt->request_bufflen - scpnt->resid < scpnt->underflow)
4155                         set_host_byte(&scpnt->result, DID_ERROR);
4156         }
4157
4158  skip_fsfstatus:
4159         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4160
4161         zfcp_cmd_dbf_event_scsi("response", scpnt);
4162
4163         /* cleanup pointer (need this especially for abort) */
4164         scpnt->host_scribble = NULL;
4165
4166         /*
4167          * NOTE:
4168          * according to the outcome of a discussion on linux-scsi we
4169          * don't need to grab the io_request_lock here since we use
4170          * the new eh
4171          */
4172         /* always call back */
4173
4174         (scpnt->scsi_done) (scpnt);
4175
4176         /*
4177          * We must hold this lock until scsi_done has been called.
4178          * Otherwise we may call scsi_done after abort regarding this
4179          * command has completed.
4180          * Note: scsi_done must not block!
4181          */
4182  out:
4183         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4184         return retval;
4185 }
4186
4187 /*
4188  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4189  *
4190  * purpose:     evaluates FCP_RSP IU
4191  *
4192  * returns:
4193  */
4194 static int
4195 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4196 {
4197         int retval = 0;
4198         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4199             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4200         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4201         struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
4202
4203         del_timer(&fsf_req->adapter->scsi_er_timer);
4204         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4205                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4206                 goto skip_fsfstatus;
4207         }
4208
4209         /* check FCP_RSP_INFO */
4210         switch (fcp_rsp_info[3]) {
4211         case RSP_CODE_GOOD:
4212                 /* ok, continue */
4213                 ZFCP_LOG_DEBUG("no failure or Task Management "
4214                                "Function complete\n");
4215                 break;
4216         case RSP_CODE_TASKMAN_UNSUPP:
4217                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4218                                 "is not supported on the target device "
4219                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4220                                 unit->fcp_lun,
4221                                 unit->port->wwpn,
4222                                 zfcp_get_busid_by_unit(unit));
4223                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4224                 break;
4225         case RSP_CODE_TASKMAN_FAILED:
4226                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4227                                 "failed to complete successfully. "
4228                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4229                                 unit->fcp_lun,
4230                                 unit->port->wwpn,
4231                                 zfcp_get_busid_by_unit(unit));
4232                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4233                 break;
4234         default:
4235                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4236                                 "code was detected for a command. "
4237                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4238                                 "(debug info 0x%x)\n",
4239                                 unit->fcp_lun,
4240                                 unit->port->wwpn,
4241                                 zfcp_get_busid_by_unit(unit),
4242                                 fcp_rsp_info[3]);
4243                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4244         }
4245
4246       skip_fsfstatus:
4247         return retval;
4248 }
4249
4250
4251 /*
4252  * function:    zfcp_fsf_control_file
4253  *
4254  * purpose:     Initiator of the control file upload/download FSF requests
4255  *
4256  * returns:     0           - FSF request is successfuly created and queued
4257  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4258  *              -EINVAL     - Invalid direction specified
4259  *              -ENOMEM     - Insufficient memory
4260  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4261  */
4262 int
4263 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4264                       struct zfcp_fsf_req **fsf_req_ptr,
4265                       u32 fsf_command,
4266                       u32 option,
4267                       struct zfcp_sg_list *sg_list)
4268 {
4269         struct zfcp_fsf_req *fsf_req;
4270         struct fsf_qtcb_bottom_support *bottom;
4271         volatile struct qdio_buffer_element *sbale;
4272         struct timer_list *timer;
4273         unsigned long lock_flags;
4274         int req_flags = 0;
4275         int direction;
4276         int retval = 0;
4277
4278         if (!(adapter->supported_features & FSF_FEATURE_CFDC)) {
4279                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4280                               zfcp_get_busid_by_adapter(adapter));
4281                 retval = -EOPNOTSUPP;
4282                 goto out;
4283         }
4284
4285         switch (fsf_command) {
4286
4287         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4288                 direction = SBAL_FLAGS0_TYPE_WRITE;
4289                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4290                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4291                         req_flags = ZFCP_WAIT_FOR_SBAL;
4292                 break;
4293
4294         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4295                 direction = SBAL_FLAGS0_TYPE_READ;
4296                 break;
4297
4298         default:
4299                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4300                 retval = -EINVAL;
4301                 goto out;
4302         }
4303
4304         timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
4305         if (!timer) {
4306                 retval = -ENOMEM;
4307                 goto out;
4308         }
4309
4310         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4311                                      NULL, &lock_flags, &fsf_req);
4312         if (retval < 0) {
4313                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4314                               "adapter %s\n",
4315                         zfcp_get_busid_by_adapter(adapter));
4316                 retval = -EPERM;
4317                 goto unlock_queue_lock;
4318         }
4319
4320         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4321         sbale[0].flags |= direction;
4322
4323         bottom = &fsf_req->qtcb->bottom.support;
4324         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4325         bottom->option = option;
4326
4327         if (sg_list->count > 0) {
4328                 int bytes;
4329
4330                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4331                                                 sg_list->sg, sg_list->count,
4332                                                 ZFCP_MAX_SBALS_PER_REQ);
4333                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4334                         ZFCP_LOG_INFO(
4335                                 "error: Could not create sufficient number of "
4336                                 "SBALS for an FSF request to the adapter %s\n",
4337                                 zfcp_get_busid_by_adapter(adapter));
4338                         retval = -ENOMEM;
4339                         goto free_fsf_req;
4340                 }
4341         } else
4342                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4343
4344         init_timer(timer);
4345         timer->function = zfcp_fsf_request_timeout_handler;
4346         timer->data = (unsigned long) adapter;
4347         timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
4348
4349         retval = zfcp_fsf_req_send(fsf_req, timer);
4350         if (retval < 0) {
4351                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4352                               "(adapter %s)\n",
4353                               zfcp_get_busid_by_adapter(adapter));
4354                 retval = -EPERM;
4355                 goto free_fsf_req;
4356         }
4357         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4358
4359         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4360                         "adapter %s\n",
4361                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4362                         "download" : "upload",
4363                         zfcp_get_busid_by_adapter(adapter));
4364
4365         wait_event(fsf_req->completion_wq,
4366                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4367
4368         *fsf_req_ptr = fsf_req;
4369         del_timer_sync(timer);
4370         goto free_timer;
4371
4372  free_fsf_req:
4373         zfcp_fsf_req_free(fsf_req);
4374  unlock_queue_lock:
4375         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4376  free_timer:
4377         kfree(timer);
4378  out:
4379         return retval;
4380 }
4381
4382
4383 /*
4384  * function:    zfcp_fsf_control_file_handler
4385  *
4386  * purpose:     Handler of the control file upload/download FSF requests
4387  *
4388  * returns:     0       - FSF request successfuly processed
4389  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4390  *              -EACCES - There is no permission to execute an operation
4391  *              -EPERM  - The control file is not in a right format
4392  *              -EIO    - There is a problem with the FCP adapter
4393  *              -EINVAL - Invalid operation
4394  *              -EFAULT - User space memory I/O operation fault
4395  */
4396 static int
4397 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4398 {
4399         struct zfcp_adapter *adapter = fsf_req->adapter;
4400         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4401         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4402         int retval = 0;
4403
4404         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4405                 retval = -EINVAL;
4406                 goto skip_fsfstatus;
4407         }
4408
4409         switch (header->fsf_status) {
4410
4411         case FSF_GOOD:
4412                 ZFCP_LOG_NORMAL(
4413                         "The FSF request has been successfully completed "
4414                         "on the adapter %s\n",
4415                         zfcp_get_busid_by_adapter(adapter));
4416                 break;
4417
4418         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4419                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4420                         switch (header->fsf_status_qual.word[0]) {
4421
4422                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4423                                 ZFCP_LOG_NORMAL(
4424                                         "CFDC on the adapter %s has being "
4425                                         "hardened on primary and secondary SE\n",
4426                                         zfcp_get_busid_by_adapter(adapter));
4427                                 break;
4428
4429                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4430                                 ZFCP_LOG_NORMAL(
4431                                         "CFDC of the adapter %s could not "
4432                                         "be saved on the SE\n",
4433                                         zfcp_get_busid_by_adapter(adapter));
4434                                 break;
4435
4436                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4437                                 ZFCP_LOG_NORMAL(
4438                                         "CFDC of the adapter %s could not "
4439                                         "be copied to the secondary SE\n",
4440                                         zfcp_get_busid_by_adapter(adapter));
4441                                 break;
4442
4443                         default:
4444                                 ZFCP_LOG_NORMAL(
4445                                         "CFDC could not be hardened "
4446                                         "on the adapter %s\n",
4447                                         zfcp_get_busid_by_adapter(adapter));
4448                         }
4449                 }
4450                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4451                 retval = -EAGAIN;
4452                 break;
4453
4454         case FSF_AUTHORIZATION_FAILURE:
4455                 ZFCP_LOG_NORMAL(
4456                         "Adapter %s does not accept privileged commands\n",
4457                         zfcp_get_busid_by_adapter(adapter));
4458                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4459                 retval = -EACCES;
4460                 break;
4461
4462         case FSF_CFDC_ERROR_DETECTED:
4463                 ZFCP_LOG_NORMAL(
4464                         "Error at position %d in the CFDC, "
4465                         "CFDC is discarded by the adapter %s\n",
4466                         header->fsf_status_qual.word[0],
4467                         zfcp_get_busid_by_adapter(adapter));
4468                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4469                 retval = -EPERM;
4470                 break;
4471
4472         case FSF_CONTROL_FILE_UPDATE_ERROR:
4473                 ZFCP_LOG_NORMAL(
4474                         "Adapter %s cannot harden the control file, "
4475                         "file is discarded\n",
4476                         zfcp_get_busid_by_adapter(adapter));
4477                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4478                 retval = -EIO;
4479                 break;
4480
4481         case FSF_CONTROL_FILE_TOO_LARGE:
4482                 ZFCP_LOG_NORMAL(
4483                         "Control file is too large, file is discarded "
4484                         "by the adapter %s\n",
4485                         zfcp_get_busid_by_adapter(adapter));
4486                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4487                 retval = -EIO;
4488                 break;
4489
4490         case FSF_ACCESS_CONFLICT_DETECTED:
4491                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4492                         ZFCP_LOG_NORMAL(
4493                                 "CFDC has been discarded by the adapter %s, "
4494                                 "because activation would impact "
4495                                 "%d active connection(s)\n",
4496                                 zfcp_get_busid_by_adapter(adapter),
4497                                 header->fsf_status_qual.word[0]);
4498                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4499                 retval = -EIO;
4500                 break;
4501
4502         case FSF_CONFLICTS_OVERRULED:
4503                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4504                         ZFCP_LOG_NORMAL(
4505                                 "CFDC has been activated on the adapter %s, "
4506                                 "but activation has impacted "
4507                                 "%d active connection(s)\n",
4508                                 zfcp_get_busid_by_adapter(adapter),
4509                                 header->fsf_status_qual.word[0]);
4510                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4511                 retval = -EIO;
4512                 break;
4513
4514         case FSF_UNKNOWN_OP_SUBTYPE:
4515                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4516                                 "op_subtype=0x%x)\n",
4517                                 zfcp_get_busid_by_adapter(adapter),
4518                                 bottom->operation_subtype);
4519                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4520                 retval = -EINVAL;
4521                 break;
4522
4523         case FSF_INVALID_COMMAND_OPTION:
4524                 ZFCP_LOG_NORMAL(
4525                         "Invalid option 0x%x has been specified "
4526                         "in QTCB bottom sent to the adapter %s\n",
4527                         bottom->option,
4528                         zfcp_get_busid_by_adapter(adapter));
4529                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4530                 retval = -EINVAL;
4531                 break;
4532
4533         default:
4534                 ZFCP_LOG_NORMAL(
4535                         "bug: An unknown/unexpected FSF status 0x%08x "
4536                         "was presented on the adapter %s\n",
4537                         header->fsf_status,
4538                         zfcp_get_busid_by_adapter(adapter));
4539                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_sq_inval");
4540                 debug_exception(fsf_req->adapter->erp_dbf, 0,
4541                         &header->fsf_status_qual.word[0], sizeof(u32));
4542                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4543                 retval = -EINVAL;
4544                 break;
4545         }
4546
4547 skip_fsfstatus:
4548         return retval;
4549 }
4550
4551 static inline int
4552 zfcp_fsf_req_sbal_check(unsigned long *flags,
4553                         struct zfcp_qdio_queue *queue, int needed)
4554 {
4555         write_lock_irqsave(&queue->queue_lock, *flags);
4556         if (likely(atomic_read(&queue->free_count) >= needed))
4557                 return 1;
4558         write_unlock_irqrestore(&queue->queue_lock, *flags);
4559         return 0;
4560 }
4561
4562 /*
4563  * set qtcb pointer in fsf_req and initialize QTCB
4564  */
4565 static inline void
4566 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req, u32 fsf_cmd)
4567 {
4568         if (likely(fsf_req->qtcb != NULL)) {
4569                 fsf_req->qtcb->prefix.req_id = (unsigned long)fsf_req;
4570                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4571                 fsf_req->qtcb->prefix.qtcb_type = fsf_qtcb_type[fsf_cmd];
4572                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4573                 fsf_req->qtcb->header.req_handle = (unsigned long)fsf_req;
4574                 fsf_req->qtcb->header.fsf_command = fsf_cmd;
4575         }
4576 }
4577
4578 /**
4579  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4580  * @adapter: adapter for which request queue is examined
4581  * @req_flags: flags indicating whether to wait for needed SBAL or not
4582  * @lock_flags: lock_flags if queue_lock is taken
4583  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4584  * Locks: lock adapter->request_queue->queue_lock on success
4585  */
4586 static int
4587 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4588                       unsigned long *lock_flags)
4589 {
4590         long ret;
4591         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4592
4593         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4594                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4595                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4596                                                        ZFCP_SBAL_TIMEOUT);
4597                 if (ret < 0)
4598                         return ret;
4599                 if (!ret)
4600                         return -EIO;
4601         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4602                 return -EIO;
4603
4604         return 0;
4605 }
4606
4607 /*
4608  * function:    zfcp_fsf_req_create
4609  *
4610  * purpose:     create an FSF request at the specified adapter and
4611  *              setup common fields
4612  *
4613  * returns:     -ENOMEM if there was insufficient memory for a request
4614  *              -EIO if no qdio buffers could be allocate to the request
4615  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4616  *              0 in success
4617  *
4618  * note:        The created request is returned by reference.
4619  *
4620  * locks:       lock of concerned request queue must not be held,
4621  *              but is held on completion (write, irqsave)
4622  */
4623 int
4624 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4625                     mempool_t *pool, unsigned long *lock_flags,
4626                     struct zfcp_fsf_req **fsf_req_p)
4627 {
4628         volatile struct qdio_buffer_element *sbale;
4629         struct zfcp_fsf_req *fsf_req = NULL;
4630         int ret = 0;
4631         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4632
4633         /* allocate new FSF request */
4634         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4635         if (unlikely(NULL == fsf_req)) {
4636                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into"
4637                                "the outbound (send) queue.\n");
4638                 ret = -ENOMEM;
4639                 goto failed_fsf_req;
4640         }
4641
4642         zfcp_fsf_req_qtcb_init(fsf_req, fsf_cmd);
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         fsf_req->adapter = adapter;     /* pointer to "parent" adapter */
4665         fsf_req->fsf_command = fsf_cmd;
4666         fsf_req->sbal_number = 1;
4667         fsf_req->sbal_first = req_queue->free_index;
4668         fsf_req->sbal_curr = req_queue->free_index;
4669         fsf_req->sbale_curr = 1;
4670
4671         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4672                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4673         }
4674
4675         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4676
4677         /* setup common SBALE fields */
4678         sbale[0].addr = fsf_req;
4679         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4680         if (likely(fsf_req->qtcb != NULL)) {
4681                 sbale[1].addr = (void *) fsf_req->qtcb;
4682                 sbale[1].length = sizeof(struct fsf_qtcb);
4683         }
4684
4685         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4686                        fsf_req->sbal_number, fsf_req->sbal_first);
4687
4688         goto success;
4689
4690  failed_sbals:
4691 /* dequeue new FSF request previously enqueued */
4692         zfcp_fsf_req_free(fsf_req);
4693         fsf_req = NULL;
4694
4695  failed_fsf_req:
4696         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4697  success:
4698         *fsf_req_p = fsf_req;
4699         return ret;
4700 }
4701
4702 /*
4703  * function:    zfcp_fsf_req_send
4704  *
4705  * purpose:     start transfer of FSF request via QDIO
4706  *
4707  * returns:     0 - request transfer succesfully started
4708  *              !0 - start of request transfer failed
4709  */
4710 static int
4711 zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req, struct timer_list *timer)
4712 {
4713         struct zfcp_adapter *adapter;
4714         struct zfcp_qdio_queue *req_queue;
4715         volatile struct qdio_buffer_element *sbale;
4716         int new_distance_from_int;
4717         unsigned long flags;
4718         int inc_seq_no = 1;
4719         int retval = 0;
4720
4721         adapter = fsf_req->adapter;
4722         req_queue = &adapter->request_queue,
4723
4724
4725         /* FIXME(debug): remove it later */
4726         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4727         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4728         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4729         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4730                       sbale[1].length);
4731
4732         /* set sequence counter in QTCB */
4733         if (likely(fsf_req->qtcb)) {
4734                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4735                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4736                 ZFCP_LOG_TRACE("FSF request %p of adapter %s gets "
4737                                "FSF sequence counter value of %i\n",
4738                                fsf_req,
4739                                zfcp_get_busid_by_adapter(adapter),
4740                                fsf_req->qtcb->prefix.req_seq_no);
4741         } else
4742                 inc_seq_no = 0;
4743
4744         /* put allocated FSF request at list tail */
4745         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4746         list_add_tail(&fsf_req->list, &adapter->fsf_req_list_head);
4747         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4748
4749         /* figure out expiration time of timeout and start timeout */
4750         if (unlikely(timer)) {
4751                 timer->expires += jiffies;
4752                 add_timer(timer);
4753         }
4754
4755         ZFCP_LOG_TRACE("request queue of adapter %s: "
4756                        "next free SBAL is %i, %i free SBALs\n",
4757                        zfcp_get_busid_by_adapter(adapter),
4758                        req_queue->free_index,
4759                        atomic_read(&req_queue->free_count));
4760
4761         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4762                        "index_in_queue=%i, count=%i, buffers=%p\n",
4763                        zfcp_get_busid_by_adapter(adapter),
4764                        QDIO_FLAG_SYNC_OUTPUT,
4765                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4766                        &req_queue->buffer[fsf_req->sbal_first]);
4767
4768         /*
4769          * adjust the number of free SBALs in request queue as well as
4770          * position of first one
4771          */
4772         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4773         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4774         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4775         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4776         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4777
4778         retval = do_QDIO(adapter->ccw_device,
4779                          QDIO_FLAG_SYNC_OUTPUT,
4780                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4781
4782         if (unlikely(retval)) {
4783                 /* Queues are down..... */
4784                 retval = -EIO;
4785                 /*
4786                  * FIXME(potential race):
4787                  * timer might be expired (absolutely unlikely)
4788                  */
4789                 if (timer)
4790                         del_timer(timer);
4791                 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4792                 list_del(&fsf_req->list);
4793                 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4794                 /*
4795                  * adjust the number of free SBALs in request queue as well as
4796                  * position of first one
4797                  */
4798                 zfcp_qdio_zero_sbals(req_queue->buffer,
4799                                      fsf_req->sbal_first, fsf_req->sbal_number);
4800                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4801                 req_queue->free_index -= fsf_req->sbal_number;   /* increase */
4802                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4803                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4804                 ZFCP_LOG_DEBUG
4805                         ("error: do_QDIO failed. Buffers could not be enqueued "
4806                          "to request queue.\n");
4807         } else {
4808                 req_queue->distance_from_int = new_distance_from_int;
4809                 /*
4810                  * increase FSF sequence counter -
4811                  * this must only be done for request successfully enqueued to
4812                  * QDIO this rejected requests may be cleaned up by calling
4813                  * routines  resulting in missing sequence counter values
4814                  * otherwise,
4815                  */
4816                 /* Don't increase for unsolicited status */
4817                 if (likely(inc_seq_no)) {
4818                         adapter->fsf_req_seq_no++;
4819                         ZFCP_LOG_TRACE
4820                             ("FSF sequence counter value of adapter %s "
4821                              "increased to %i\n",
4822                              zfcp_get_busid_by_adapter(adapter),
4823                              adapter->fsf_req_seq_no);
4824                 }
4825                 /* count FSF requests pending */
4826                 atomic_inc(&adapter->fsf_reqs_active);
4827         }
4828         return retval;
4829 }
4830
4831 #undef ZFCP_LOG_AREA