err.no Git - linux-2.6/blob - drivers/s390/scsi/zfcp_fsf.c

   1 /*
   2  *
   3  * linux/drivers/s390/scsi/zfcp_fsf.c
   4  *
   5  * FCP adapter driver for IBM eServer zSeries
   6  *
   7  * (C) Copyright IBM Corp. 2002, 2004
   8  *
   9  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  11  *            Aron Zeh
  12  *            Wolfgang Taphorn
  13  *            Stefan Bader <stefan.bader@de.ibm.com>
  14  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  15  *            Andreas Herrmann <aherrman@de.ibm.com>
  16  *            Volker Sameske <sameske@de.ibm.com>
  17  *
  18  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation; either version 2, or (at your option)
  21  * any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  31  */
  32
  33 #define ZFCP_FSF_C_REVISION "$Revision: 1.92 $"
  34
  35 #include "zfcp_ext.h"
  36
  37 static int zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *);
  38 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *);
  39 static int zfcp_fsf_open_port_handler(struct zfcp_fsf_req *);
  40 static int zfcp_fsf_close_port_handler(struct zfcp_fsf_req *);
  41 static int zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *);
  42 static int zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *);
  43 static int zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *);
  44 static int zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *);
  45 static int zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *);
  46 static int zfcp_fsf_send_fcp_command_task_management_handler(
  47         struct zfcp_fsf_req *);
  48 static int zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *);
  49 static int zfcp_fsf_status_read_handler(struct zfcp_fsf_req *);
  50 static int zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *);
  51 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *);
  52 static int zfcp_fsf_control_file_handler(struct zfcp_fsf_req *);
  53 static inline int zfcp_fsf_req_sbal_check(
  54         unsigned long *, struct zfcp_qdio_queue *, int);
  55 static inline int zfcp_use_one_sbal(
  56         struct scatterlist *, int, struct scatterlist *, int);
  57 static struct zfcp_fsf_req *zfcp_fsf_req_alloc(mempool_t *, int);
  58 static int zfcp_fsf_req_send(struct zfcp_fsf_req *, struct timer_list *);
  59 static int zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *);
  60 static int zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *);
  61 static int zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *);
  62 static 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.status_read.buffer = 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 = fsf_req->data.status_read.buffer;
 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             fsf_req->data.status_read.buffer;
 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.abort_fcp_command.unit = 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 = new_fsf_req->data.abort_fcp_command.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         /* evaluate FSF status in QTCB */
1154         switch (new_fsf_req->qtcb->header.fsf_status) {
1155
1156         case FSF_PORT_HANDLE_NOT_VALID:
1157                 if (status_qual >> 4 != status_qual % 0xf) {
1158                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1159                                          "fsf_s_phand_nv0");
1160                         /*
1161                          * In this case a command that was sent prior to a port
1162                          * reopen was aborted (handles are different). This is
1163                          * fine.
1164                          */
1165                 } else {
1166                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1167                                       "port 0x%016Lx on adapter %s invalid. "
1168                                       "This may happen occasionally.\n",
1169                                       unit->port->handle,
1170                                       unit->port->wwpn,
1171                                       zfcp_get_busid_by_unit(unit));
1172                         ZFCP_LOG_INFO("status qualifier:\n");
1173                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1174                                       (char *) &new_fsf_req->qtcb->header.
1175                                       fsf_status_qual,
1176                                       sizeof (union fsf_status_qual));
1177                         /* Let's hope this sorts out the mess */
1178                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1179                                          "fsf_s_phand_nv1");
1180                         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
1181                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1182                 }
1183                 break;
1184
1185         case FSF_LUN_HANDLE_NOT_VALID:
1186                 if (status_qual >> 4 != status_qual % 0xf) {
1187                         /* 2 */
1188                         debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1189                                          "fsf_s_lhand_nv0");
1190                         /*
1191                          * In this case a command that was sent prior to a unit
1192                          * reopen was aborted (handles are different).
1193                          * This is fine.
1194                          */
1195                 } else {
1196                         ZFCP_LOG_INFO
1197                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1198                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1199                              "invalid. This may happen in rare cases. "
1200                              "Trying to re-establish link.\n",
1201                              unit->handle,
1202                              unit->fcp_lun,
1203                              unit->port->wwpn,
1204                              zfcp_get_busid_by_unit(unit));
1205                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1206                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1207                                       (char *) &new_fsf_req->qtcb->header.
1208                                       fsf_status_qual,
1209                                       sizeof (union fsf_status_qual));
1210                         /* Let's hope this sorts out the mess */
1211                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1212                                          "fsf_s_lhand_nv1");
1213                         zfcp_erp_port_reopen(unit->port, 0);
1214                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1215                 }
1216                 break;
1217
1218         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1219                 retval = 0;
1220                 debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
1221                                  "fsf_s_no_exist");
1222                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1223                 break;
1224
1225         case FSF_PORT_BOXED:
1226                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1227                               "be reopened\n", unit->port->wwpn,
1228                               zfcp_get_busid_by_unit(unit));
1229                 debug_text_event(new_fsf_req->adapter->erp_dbf, 2,
1230                                  "fsf_s_pboxed");
1231                 zfcp_erp_port_boxed(unit->port);
1232                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1233                     | ZFCP_STATUS_FSFREQ_RETRY;
1234                 break;
1235
1236         case FSF_LUN_BOXED:
1237                 ZFCP_LOG_INFO(
1238                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1239                         "to be reopened\n",
1240                         unit->fcp_lun, unit->port->wwpn,
1241                         zfcp_get_busid_by_unit(unit));
1242                 debug_text_event(new_fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
1243                 zfcp_erp_unit_boxed(unit);
1244                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1245                         | ZFCP_STATUS_FSFREQ_RETRY;
1246                 break;
1247
1248         case FSF_ADAPTER_STATUS_AVAILABLE:
1249                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1250                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1251                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1252                                          "fsf_sq_ltest");
1253                         zfcp_test_link(unit->port);
1254                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1255                         break;
1256                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1257                         /* SCSI stack will escalate */
1258                         debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
1259                                          "fsf_sq_ulp");
1260                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1261                         break;
1262                 default:
1263                         ZFCP_LOG_NORMAL
1264                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1265                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1266                         debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1267                                          "fsf_sq_inval:");
1268                         debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1269                                         &new_fsf_req->qtcb->header.
1270                                         fsf_status_qual.word[0], sizeof (u32));
1271                         break;
1272                 }
1273                 break;
1274
1275         case FSF_GOOD:
1276                 retval = 0;
1277                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1278                 break;
1279
1280         default:
1281                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1282                                 "(debug info 0x%x)\n",
1283                                 new_fsf_req->qtcb->header.fsf_status);
1284                 debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
1285                                  "fsf_s_inval:");
1286                 debug_exception(new_fsf_req->adapter->erp_dbf, 0,
1287                                 &new_fsf_req->qtcb->header.fsf_status,
1288                                 sizeof (u32));
1289                 break;
1290         }
1291  skip_fsfstatus:
1292         return retval;
1293 }
1294
1295 /**
1296  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1297  *      one SBALE
1298  * Two scatter-gather lists are passed, one for the reqeust and one for the
1299  * response.
1300  */
1301 static inline int
1302 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1303                   struct scatterlist *resp, int resp_count)
1304 {
1305         return ((req_count == 1) &&
1306                 (resp_count == 1) &&
1307                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1308                   PAGE_MASK) ==
1309                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1310                                    req[0].length - 1) & PAGE_MASK)) &&
1311                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1312                   PAGE_MASK) ==
1313                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1314                                    resp[0].length - 1) & PAGE_MASK)));
1315 }
1316
1317 /**
1318  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1319  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1320  *      the request
1321  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1322  *      a struct zfcp_fsf_req
1323  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1324  *      is sent within error recovery
1325  */
1326 int
1327 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1328                  struct zfcp_erp_action *erp_action)
1329 {
1330         volatile struct qdio_buffer_element *sbale;
1331         struct zfcp_port *port;
1332         struct zfcp_adapter *adapter;
1333         struct zfcp_fsf_req *fsf_req;
1334         unsigned long lock_flags;
1335         int bytes;
1336         int ret = 0;
1337
1338         port = ct->port;
1339         adapter = port->adapter;
1340
1341         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1342                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1343                                   pool, &lock_flags, &fsf_req);
1344         if (ret < 0) {
1345                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1346                               "adapter: %s\n",
1347                               zfcp_get_busid_by_adapter(adapter));
1348                 goto failed_req;
1349         }
1350
1351         if (erp_action != NULL) {
1352                 erp_action->fsf_req = fsf_req;
1353                 fsf_req->erp_action = erp_action;
1354         }
1355
1356         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1357         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1358                               ct->resp, ct->resp_count)){
1359                 /* both request buffer and response buffer
1360                    fit into one sbale each */
1361                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1362                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1363                 sbale[2].length = ct->req[0].length;
1364                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1365                 sbale[3].length = ct->resp[0].length;
1366                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1367         } else if (adapter->supported_features &
1368                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1369                 /* try to use chained SBALs */
1370                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1371                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1372                                                 ct->req, ct->req_count,
1373                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1374                 if (bytes <= 0) {
1375                         ZFCP_LOG_INFO("error: creation of CT request failed "
1376                                       "on adapter %s\n",
1377                                       zfcp_get_busid_by_adapter(adapter));
1378                         if (bytes == 0)
1379                                 ret = -ENOMEM;
1380                         else
1381                                 ret = bytes;
1382
1383                         goto failed_send;
1384                 }
1385                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1386                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1387                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1388                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1389                                                 ct->resp, ct->resp_count,
1390                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1391                 if (bytes <= 0) {
1392                         ZFCP_LOG_INFO("error: creation of CT request failed "
1393                                       "on adapter %s\n",
1394                                       zfcp_get_busid_by_adapter(adapter));
1395                         if (bytes == 0)
1396                                 ret = -ENOMEM;
1397                         else
1398                                 ret = bytes;
1399
1400                         goto failed_send;
1401                 }
1402                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1403         } else {
1404                 /* reject send generic request */
1405                 ZFCP_LOG_INFO(
1406                         "error: microcode does not support chained SBALs,"
1407                         "CT request too big (adapter %s)\n",
1408                         zfcp_get_busid_by_adapter(adapter));
1409                 ret = -EOPNOTSUPP;
1410                 goto failed_send;
1411         }
1412
1413         /* settings in QTCB */
1414         fsf_req->qtcb->header.port_handle = port->handle;
1415         fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
1416         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1417         fsf_req->data.send_ct = ct;
1418
1419         /* start QDIO request for this FSF request */
1420         ret = zfcp_fsf_req_send(fsf_req, ct->timer);
1421         if (ret) {
1422                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1423                                "(adapter %s, port 0x%016Lx)\n",
1424                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1425                 goto failed_send;
1426         }
1427
1428         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1429                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1430         goto out;
1431
1432  failed_send:
1433         zfcp_fsf_req_free(fsf_req);
1434         if (erp_action != NULL) {
1435                 erp_action->fsf_req = NULL;
1436         }
1437  failed_req:
1438  out:
1439         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1440                                 lock_flags);
1441         return ret;
1442 }
1443
1444 /**
1445  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1446  * @fsf_req: pointer to struct zfcp_fsf_req
1447  *
1448  * Data specific for the Generic Service request is passed by
1449  * fsf_req->data.send_ct
1450  * Usually a specific handler for the request is called via
1451  * fsf_req->data.send_ct->handler at end of this function.
1452  */
1453 static int
1454 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1455 {
1456         struct zfcp_port *port;
1457         struct zfcp_adapter *adapter;
1458         struct zfcp_send_ct *send_ct;
1459         struct fsf_qtcb_header *header;
1460         struct fsf_qtcb_bottom_support *bottom;
1461         int retval = -EINVAL;
1462         u16 subtable, rule, counter;
1463
1464         adapter = fsf_req->adapter;
1465         send_ct = fsf_req->data.send_ct;
1466         port = send_ct->port;
1467         header = &fsf_req->qtcb->header;
1468         bottom = &fsf_req->qtcb->bottom.support;
1469
1470         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1471                 goto skip_fsfstatus;
1472
1473         /* evaluate FSF status in QTCB */
1474         switch (header->fsf_status) {
1475
1476         case FSF_GOOD:
1477                 retval = 0;
1478                 break;
1479
1480         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1481                 if (adapter->fc_service_class <= 3) {
1482                         ZFCP_LOG_INFO("error: adapter %s does not support fc "
1483                                       "class %d.\n",
1484                                       zfcp_get_busid_by_port(port),
1485                                       adapter->fc_service_class);
1486                 } else {
1487                         ZFCP_LOG_INFO("bug: The fibre channel class at the "
1488                                       "adapter %s is invalid. "
1489                                       "(debug info %d)\n",
1490                                       zfcp_get_busid_by_port(port),
1491                                       adapter->fc_service_class);
1492                 }
1493                 /* stop operation for this adapter */
1494                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1495                 zfcp_erp_adapter_shutdown(adapter, 0);
1496                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1497                 break;
1498
1499         case FSF_ADAPTER_STATUS_AVAILABLE:
1500                 switch (header->fsf_status_qual.word[0]){
1501                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1502                         /* reopening link to port */
1503                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1504                         zfcp_test_link(port);
1505                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1506                         break;
1507                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1508                         /* ERP strategy will escalate */
1509                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1510                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1511                         break;
1512                 default:
1513                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1514                                       "arrived.\n",
1515                                       header->fsf_status_qual.word[0]);
1516                         break;
1517                 }
1518                 break;
1519
1520         case FSF_ACCESS_DENIED:
1521                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1522                                 "command (adapter %s, port d_id=0x%08x)\n",
1523                                 zfcp_get_busid_by_port(port), port->d_id);
1524                 for (counter = 0; counter < 2; counter++) {
1525                         subtable = header->fsf_status_qual.halfword[counter * 2];
1526                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1527                         switch (subtable) {
1528                         case FSF_SQ_CFDC_SUBTABLE_OS:
1529                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1530                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1531                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1532                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1533                                         zfcp_act_subtable_type[subtable], rule);
1534                                 break;
1535                         }
1536                 }
1537                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1538                 zfcp_erp_port_access_denied(port);
1539                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1540                 break;
1541
1542         case FSF_GENERIC_COMMAND_REJECTED:
1543                 ZFCP_LOG_INFO("generic service command rejected "
1544                               "(adapter %s, port d_id=0x%08x)\n",
1545                               zfcp_get_busid_by_port(port), port->d_id);
1546                 ZFCP_LOG_INFO("status qualifier:\n");
1547                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1548                               (char *) &header->fsf_status_qual,
1549                               sizeof (union fsf_status_qual));
1550                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_gcom_rej");
1551                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1552                 break;
1553
1554         case FSF_PORT_HANDLE_NOT_VALID:
1555                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1556                                "0x%016Lx on adapter %s invalid. This may "
1557                                "happen occasionally.\n", port->handle,
1558                                port->wwpn, zfcp_get_busid_by_port(port));
1559                 ZFCP_LOG_INFO("status qualifier:\n");
1560                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1561                               (char *) &header->fsf_status_qual,
1562                               sizeof (union fsf_status_qual));
1563                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_phandle_nv");
1564                 zfcp_erp_adapter_reopen(adapter, 0);
1565                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1566                 break;
1567
1568         case FSF_PORT_BOXED:
1569                 ZFCP_LOG_INFO("port needs to be reopened "
1570                               "(adapter %s, port d_id=0x%08x)\n",
1571                               zfcp_get_busid_by_port(port), port->d_id);
1572                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
1573                 zfcp_erp_port_boxed(port);
1574                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1575                     | ZFCP_STATUS_FSFREQ_RETRY;
1576                 break;
1577
1578         /* following states should never occure, all cases avoided
1579            in zfcp_fsf_send_ct - but who knows ... */
1580         case FSF_PAYLOAD_SIZE_MISMATCH:
1581                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1582                               "req_buf_length=%d, resp_buf_length=%d)\n",
1583                               zfcp_get_busid_by_adapter(adapter),
1584                               bottom->req_buf_length, bottom->resp_buf_length);
1585                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1586                 break;
1587         case FSF_REQUEST_SIZE_TOO_LARGE:
1588                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1589                               "req_buf_length=%d)\n",
1590                               zfcp_get_busid_by_adapter(adapter),
1591                               bottom->req_buf_length);
1592                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1593                 break;
1594         case FSF_RESPONSE_SIZE_TOO_LARGE:
1595                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1596                               "resp_buf_length=%d)\n",
1597                               zfcp_get_busid_by_adapter(adapter),
1598                               bottom->resp_buf_length);
1599                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1600                 break;
1601         case FSF_SBAL_MISMATCH:
1602                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1603                               "resp_buf_length=%d)\n",
1604                               zfcp_get_busid_by_adapter(adapter),
1605                               bottom->req_buf_length, bottom->resp_buf_length);
1606                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1607                 break;
1608
1609        default:
1610                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1611                                 "(debug info 0x%x)\n", header->fsf_status);
1612                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval:");
1613                 debug_exception(adapter->erp_dbf, 0,
1614                                 &header->fsf_status_qual.word[0], sizeof (u32));
1615                 break;
1616         }
1617
1618 skip_fsfstatus:
1619         send_ct->status = retval;
1620
1621         if (send_ct->handler != NULL)
1622                 send_ct->handler(send_ct->handler_data);
1623
1624         return retval;
1625 }
1626
1627 /**
1628  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1629  * @els: pointer to struct zfcp_send_els which contains all needed data for
1630  *      the command.
1631  */
1632 int
1633 zfcp_fsf_send_els(struct zfcp_send_els *els)
1634 {
1635         volatile struct qdio_buffer_element *sbale;
1636         struct zfcp_fsf_req *fsf_req;
1637         fc_id_t d_id;
1638         struct zfcp_adapter *adapter;
1639         unsigned long lock_flags;
1640         int bytes;
1641         int ret = 0;
1642
1643         d_id = els->d_id;
1644         adapter = els->adapter;
1645
1646         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1647                                   ZFCP_REQ_AUTO_CLEANUP,
1648                                   NULL, &lock_flags, &fsf_req);
1649         if (ret < 0) {
1650                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1651                               "(adapter %s, port d_id: 0x%08x)\n",
1652                               zfcp_get_busid_by_adapter(adapter), d_id);
1653                 goto failed_req;
1654         }
1655
1656         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1657         if (zfcp_use_one_sbal(els->req, els->req_count,
1658                               els->resp, els->resp_count)){
1659                 /* both request buffer and response buffer
1660                    fit into one sbale each */
1661                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1662                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1663                 sbale[2].length = els->req[0].length;
1664                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1665                 sbale[3].length = els->resp[0].length;
1666                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1667         } else if (adapter->supported_features &
1668                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1669                 /* try to use chained SBALs */
1670                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1671                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1672                                                 els->req, els->req_count,
1673                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1674                 if (bytes <= 0) {
1675                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1676                                       "(adapter %s, port d_id: 0x%08x)\n",
1677                                       zfcp_get_busid_by_adapter(adapter), d_id);
1678                         if (bytes == 0) {
1679                                 ret = -ENOMEM;
1680                         } else {
1681                                 ret = bytes;
1682                         }
1683                         goto failed_send;
1684                 }
1685                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1686                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1687                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1688                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1689                                                 els->resp, els->resp_count,
1690                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1691                 if (bytes <= 0) {
1692                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1693                                       "(adapter %s, port d_id: 0x%08x)\n",
1694                                       zfcp_get_busid_by_adapter(adapter), d_id);
1695                         if (bytes == 0) {
1696                                 ret = -ENOMEM;
1697                         } else {
1698                                 ret = bytes;
1699                         }
1700                         goto failed_send;
1701                 }
1702                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1703         } else {
1704                 /* reject request */
1705                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1706                               ", ELS request too big (adapter %s, "
1707                               "port d_id: 0x%08x)\n",
1708                               zfcp_get_busid_by_adapter(adapter), d_id);
1709                 ret = -EOPNOTSUPP;
1710                 goto failed_send;
1711         }
1712
1713         /* settings in QTCB */
1714         fsf_req->qtcb->bottom.support.d_id = d_id;
1715         fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
1716         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1717         fsf_req->data.send_els = els;
1718
1719         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1720
1721         /* start QDIO request for this FSF request */
1722         ret = zfcp_fsf_req_send(fsf_req, els->timer);
1723         if (ret) {
1724                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1725                                "(adapter %s, port d_id: 0x%08x)\n",
1726                                zfcp_get_busid_by_adapter(adapter), d_id);
1727                 goto failed_send;
1728         }
1729
1730         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1731                        "0x%08x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1732         goto out;
1733
1734  failed_send:
1735         zfcp_fsf_req_free(fsf_req);
1736
1737  failed_req:
1738  out:
1739         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1740                                 lock_flags);
1741
1742         return ret;
1743 }
1744
1745 /**
1746  * zfcp_fsf_send_els_handler - handler for ELS commands
1747  * @fsf_req: pointer to struct zfcp_fsf_req
1748  *
1749  * Data specific for the ELS command is passed by
1750  * fsf_req->data.send_els
1751  * Usually a specific handler for the command is called via
1752  * fsf_req->data.send_els->handler at end of this function.
1753  */
1754 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1755 {
1756         struct zfcp_adapter *adapter;
1757         struct zfcp_port *port;
1758         fc_id_t d_id;
1759         struct fsf_qtcb_header *header;
1760         struct fsf_qtcb_bottom_support *bottom;
1761         struct zfcp_send_els *send_els;
1762         int retval = -EINVAL;
1763         u16 subtable, rule, counter;
1764
1765         send_els = fsf_req->data.send_els;
1766         adapter = send_els->adapter;
1767         port = send_els->port;
1768         d_id = send_els->d_id;
1769         header = &fsf_req->qtcb->header;
1770         bottom = &fsf_req->qtcb->bottom.support;
1771
1772         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1773                 goto skip_fsfstatus;
1774
1775         switch (header->fsf_status) {
1776
1777         case FSF_GOOD:
1778                 retval = 0;
1779                 break;
1780
1781         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1782                 if (adapter->fc_service_class <= 3) {
1783                         ZFCP_LOG_INFO("error: adapter %s does "
1784                                       "not support fibrechannel class %d.\n",
1785                                       zfcp_get_busid_by_adapter(adapter),
1786                                       adapter->fc_service_class);
1787                 } else {
1788                         ZFCP_LOG_INFO("bug: The fibrechannel class at "
1789                                       "adapter %s is invalid. "
1790                                       "(debug info %d)\n",
1791                                       zfcp_get_busid_by_adapter(adapter),
1792                                       adapter->fc_service_class);
1793                 }
1794                 /* stop operation for this adapter */
1795                 debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
1796                 zfcp_erp_adapter_shutdown(adapter, 0);
1797                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1798                 break;
1799
1800         case FSF_ADAPTER_STATUS_AVAILABLE:
1801                 switch (header->fsf_status_qual.word[0]){
1802                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1803                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
1804                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1805                                 zfcp_test_link(port);
1806                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1807                         break;
1808                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1809                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
1810                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1811                         retval =
1812                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1813                                               (struct zfcp_ls_rjt_par *)
1814                                               &header->fsf_status_qual.word[2]);
1815                         break;
1816                 case FSF_SQ_RETRY_IF_POSSIBLE:
1817                         debug_text_event(adapter->erp_dbf, 1, "fsf_sq_retry");
1818                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1819                         break;
1820                 default:
1821                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1822                                       header->fsf_status_qual.word[0]);
1823                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1824                                 (char*)header->fsf_status_qual.word, 16);
1825                 }
1826                 break;
1827
1828         case FSF_ELS_COMMAND_REJECTED:
1829                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1830                               "prohibited sending "
1831                               "(adapter: %s, port d_id: 0x%08x)\n",
1832                               zfcp_get_busid_by_adapter(adapter), d_id);
1833
1834                 break;
1835
1836         case FSF_PAYLOAD_SIZE_MISMATCH:
1837                 ZFCP_LOG_INFO(
1838                         "ELS request size and ELS response size must be either "
1839                         "both 0, or both greater than 0 "
1840                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1841                         zfcp_get_busid_by_adapter(adapter),
1842                         bottom->req_buf_length,
1843                         bottom->resp_buf_length);
1844                 break;
1845
1846         case FSF_REQUEST_SIZE_TOO_LARGE:
1847                 ZFCP_LOG_INFO(
1848                         "Length of the ELS request buffer, "
1849                         "specified in QTCB bottom, "
1850                         "exceeds the size of the buffers "
1851                         "that have been allocated for ELS request data "
1852                         "(adapter: %s, req_buf_length=%d)\n",
1853                         zfcp_get_busid_by_adapter(adapter),
1854                         bottom->req_buf_length);
1855                 break;
1856
1857         case FSF_RESPONSE_SIZE_TOO_LARGE:
1858                 ZFCP_LOG_INFO(
1859                         "Length of the ELS response buffer, "
1860                         "specified in QTCB bottom, "
1861                         "exceeds the size of the buffers "
1862                         "that have been allocated for ELS response data "
1863                         "(adapter: %s, resp_buf_length=%d)\n",
1864                         zfcp_get_busid_by_adapter(adapter),
1865                         bottom->resp_buf_length);
1866                 break;
1867
1868         case FSF_SBAL_MISMATCH:
1869                 /* should never occure, avoided in zfcp_fsf_send_els */
1870                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1871                               "resp_buf_length=%d)\n",
1872                               zfcp_get_busid_by_adapter(adapter),
1873                               bottom->req_buf_length, bottom->resp_buf_length);
1874                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1875                 break;
1876
1877         case FSF_ACCESS_DENIED:
1878                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1879                                 "(adapter %s, port d_id=0x%08x)\n",
1880                                 zfcp_get_busid_by_adapter(adapter), d_id);
1881                 for (counter = 0; counter < 2; counter++) {
1882                         subtable = header->fsf_status_qual.halfword[counter * 2];
1883                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1884                         switch (subtable) {
1885                         case FSF_SQ_CFDC_SUBTABLE_OS:
1886                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1887                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1888                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1889                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1890                                         zfcp_act_subtable_type[subtable], rule);
1891                                 break;
1892                         }
1893                 }
1894                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
1895                 if (port != NULL)
1896                         zfcp_erp_port_access_denied(port);
1897                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1898                 break;
1899
1900         default:
1901                 ZFCP_LOG_NORMAL(
1902                         "bug: An unknown FSF Status was presented "
1903                         "(adapter: %s, fsf_status=0x%08x)\n",
1904                         zfcp_get_busid_by_adapter(adapter),
1905                         header->fsf_status);
1906                 debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval");
1907                 debug_exception(adapter->erp_dbf, 0,
1908                         &header->fsf_status_qual.word[0], sizeof(u32));
1909                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1910                 break;
1911         }
1912
1913 skip_fsfstatus:
1914         send_els->status = retval;
1915
1916         if (send_els->handler != 0)
1917                 send_els->handler(send_els->handler_data);
1918
1919         return retval;
1920 }
1921
1922 /*
1923  * function:
1924  *
1925  * purpose:
1926  *
1927  * returns:     address of initiated FSF request
1928  *              NULL - request could not be initiated
1929  */
1930 int
1931 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1932 {
1933         volatile struct qdio_buffer_element *sbale;
1934         unsigned long lock_flags;
1935         int retval = 0;
1936
1937         /* setup new FSF request */
1938         retval = zfcp_fsf_req_create(erp_action->adapter,
1939                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1940                                      ZFCP_REQ_AUTO_CLEANUP,
1941                                      erp_action->adapter->pool.fsf_req_erp,
1942                                      &lock_flags, &(erp_action->fsf_req));
1943         if (retval < 0) {
1944                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1945                               "data request for adapter %s.\n",
1946                               zfcp_get_busid_by_adapter(erp_action->adapter));
1947                 goto out;
1948         }
1949
1950         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
1951                                     erp_action->fsf_req->sbal_curr, 0);
1952         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1953         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1954
1955         erp_action->fsf_req->erp_action = erp_action;
1956         erp_action->fsf_req->qtcb->bottom.config.feature_selection =
1957                 (FSF_FEATURE_CFDC | FSF_FEATURE_LUN_SHARING);
1958
1959         /* start QDIO request for this FSF request */
1960         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
1961         if (retval) {
1962                 ZFCP_LOG_INFO
1963                     ("error: Could not send exchange configuration data "
1964                      "command on the adapter %s\n",
1965                      zfcp_get_busid_by_adapter(erp_action->adapter));
1966                 zfcp_fsf_req_free(erp_action->fsf_req);
1967                 erp_action->fsf_req = NULL;
1968                 goto out;
1969         }
1970
1971         ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1972                        "(adapter %s)\n",
1973                        zfcp_get_busid_by_adapter(erp_action->adapter));
1974
1975  out:
1976         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
1977                                 lock_flags);
1978         return retval;
1979 }
1980
1981 /**
1982  * zfcp_fsf_exchange_config_evaluate
1983  * @fsf_req: fsf_req which belongs to xchg config data request
1984  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1985  *
1986  * returns: -EIO on error, 0 otherwise
1987  */
1988 static int
1989 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
1990 {
1991         struct fsf_qtcb_bottom_config *bottom;
1992         struct zfcp_adapter *adapter = fsf_req->adapter;
1993
1994         bottom = &fsf_req->qtcb->bottom.config;
1995         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
1996                        bottom->low_qtcb_version, bottom->high_qtcb_version);
1997         adapter->fsf_lic_version = bottom->lic_version;
1998         adapter->supported_features = bottom->supported_features;
1999         adapter->peer_wwpn = 0;
2000         adapter->peer_wwnn = 0;
2001         adapter->peer_d_id = 0;
2002
2003         if (xchg_ok) {
2004                 adapter->wwnn = bottom->nport_serv_param.wwnn;
2005                 adapter->wwpn = bottom->nport_serv_param.wwpn;
2006                 adapter->s_id = bottom->s_id & ZFCP_DID_MASK;
2007                 adapter->fc_topology = bottom->fc_topology;
2008                 adapter->fc_link_speed = bottom->fc_link_speed;
2009                 adapter->hydra_version = bottom->adapter_type;
2010         } else {
2011                 adapter->wwnn = 0;
2012                 adapter->wwpn = 0;
2013                 adapter->s_id = 0;
2014                 adapter->fc_topology = 0;
2015                 adapter->fc_link_speed = 0;
2016                 adapter->hydra_version = 0;
2017         }
2018
2019         if (adapter->fc_topology == FSF_TOPO_P2P) {
2020                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2021                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2022                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2023         }
2024
2025         if(adapter->supported_features & FSF_FEATURE_HBAAPI_MANAGEMENT){
2026                 adapter->hardware_version = bottom->hardware_version;
2027                 memcpy(adapter->serial_number, bottom->serial_number, 17);
2028                 EBCASC(adapter->serial_number, sizeof(adapter->serial_number));
2029         }
2030
2031         ZFCP_LOG_NORMAL("The adapter %s reported the following characteristics:\n"
2032                       "WWNN 0x%016Lx, "
2033                       "WWPN 0x%016Lx, "
2034                       "S_ID 0x%08x,\n"
2035                       "adapter version 0x%x, "
2036                       "LIC version 0x%x, "
2037                       "FC link speed %d Gb/s\n",
2038                       zfcp_get_busid_by_adapter(adapter),
2039                       adapter->wwnn,
2040                       adapter->wwpn,
2041                       (unsigned int) adapter->s_id,
2042                       adapter->hydra_version,
2043                       adapter->fsf_lic_version,
2044                       adapter->fc_link_speed);
2045         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2046                 ZFCP_LOG_NORMAL("error: the adapter %s "
2047                                 "only supports newer control block "
2048                                 "versions in comparison to this device "
2049                                 "driver (try updated device driver)\n",
2050                                 zfcp_get_busid_by_adapter(adapter));
2051                 debug_text_event(adapter->erp_dbf, 0, "low_qtcb_ver");
2052                 zfcp_erp_adapter_shutdown(adapter, 0);
2053                 return -EIO;
2054         }
2055         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2056                 ZFCP_LOG_NORMAL("error: the adapter %s "
2057                                 "only supports older control block "
2058                                 "versions than this device driver uses"
2059                                 "(consider a microcode upgrade)\n",
2060                                 zfcp_get_busid_by_adapter(adapter));
2061                 debug_text_event(adapter->erp_dbf, 0, "high_qtcb_ver");
2062                 zfcp_erp_adapter_shutdown(adapter, 0);
2063                 return -EIO;
2064         }
2065         return 0;
2066 }
2067
2068 /*
2069  * function:    zfcp_fsf_exchange_config_data_handler
2070  *
2071  * purpose:     is called for finished Exchange Configuration Data command
2072  *
2073  * returns:
2074  */
2075 static int
2076 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2077 {
2078         struct fsf_qtcb_bottom_config *bottom;
2079         struct zfcp_adapter *adapter = fsf_req->adapter;
2080
2081         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2082                 return -EIO;
2083
2084         switch (fsf_req->qtcb->header.fsf_status) {
2085
2086         case FSF_GOOD:
2087                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2088                         return -EIO;
2089
2090                 switch (adapter->fc_topology) {
2091                 case FSF_TOPO_P2P:
2092                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2093                                         "configuration detected at adapter %s\n"
2094                                         "Peer WWNN 0x%016llx, "
2095                                         "peer WWPN 0x%016llx, "
2096                                         "peer d_id 0x%06x\n",
2097                                         zfcp_get_busid_by_adapter(adapter),
2098                                         adapter->peer_wwnn,
2099                                         adapter->peer_wwpn,
2100                                         adapter->peer_d_id);
2101                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2102                                          "top-p-to-p");
2103                         break;
2104                 case FSF_TOPO_AL:
2105                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2106                                         "topology detected at adapter %s "
2107                                         "unsupported, shutting down adapter\n",
2108                                         zfcp_get_busid_by_adapter(adapter));
2109                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2110                                          "top-al");
2111                         zfcp_erp_adapter_shutdown(adapter, 0);
2112                         return -EIO;
2113                 case FSF_TOPO_FABRIC:
2114                         ZFCP_LOG_INFO("Switched fabric fibrechannel "
2115                                       "network detected at adapter %s.\n",
2116                                       zfcp_get_busid_by_adapter(adapter));
2117                         break;
2118                 default:
2119                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2120                                         "reported by the exchange "
2121                                         "configuration command for "
2122                                         "the adapter %s is not "
2123                                         "of a type known to the zfcp "
2124                                         "driver, shutting down adapter\n",
2125                                         zfcp_get_busid_by_adapter(adapter));
2126                         adapter->fc_topology = FSF_TOPO_ERROR;
2127                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2128                                              "unknown-topo");
2129                         zfcp_erp_adapter_shutdown(adapter, 0);
2130                         return -EIO;
2131                 }
2132                 bottom = &fsf_req->qtcb->bottom.config;
2133                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2134                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2135                                         "allowed by the adapter %s "
2136                                         "is lower than the minimum "
2137                                         "required by the driver (%ld bytes).\n",
2138                                         bottom->max_qtcb_size,
2139                                         zfcp_get_busid_by_adapter(adapter),
2140                                         sizeof(struct fsf_qtcb));
2141                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2142                                          "qtcb-size");
2143                         debug_event(fsf_req->adapter->erp_dbf, 0,
2144                                     &bottom->max_qtcb_size, sizeof (u32));
2145                         zfcp_erp_adapter_shutdown(adapter, 0);
2146                         return -EIO;
2147                 }
2148                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2149                                 &adapter->status);
2150                 break;
2151         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2152                 debug_text_event(adapter->erp_dbf, 0, "xchg-inco");
2153
2154                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2155                         return -EIO;
2156
2157                 ZFCP_LOG_INFO("Local link to adapter %s is down\n",
2158                               zfcp_get_busid_by_adapter(adapter));
2159                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
2160                                 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
2161                                 &adapter->status);
2162                 zfcp_erp_adapter_failed(adapter);
2163                 break;
2164         default:
2165                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf-stat-ng");
2166                 debug_event(fsf_req->adapter->erp_dbf, 0,
2167                             &fsf_req->qtcb->header.fsf_status, sizeof (u32));
2168                 zfcp_erp_adapter_shutdown(adapter, 0);
2169                 return -EIO;
2170         }
2171         return 0;
2172 }
2173
2174 /**
2175  * zfcp_fsf_exchange_port_data - request information about local port
2176  * @adapter: for which port data is requested
2177  * @data: response to exchange port data request
2178  */
2179 int
2180 zfcp_fsf_exchange_port_data(struct zfcp_adapter *adapter,
2181                             struct fsf_qtcb_bottom_port *data)
2182 {
2183         volatile struct qdio_buffer_element *sbale;
2184         int retval = 0;
2185         unsigned long lock_flags;
2186         struct zfcp_fsf_req *fsf_req;
2187         struct timer_list *timer;
2188
2189         if(!(adapter->supported_features & FSF_FEATURE_HBAAPI_MANAGEMENT)){
2190                 ZFCP_LOG_INFO("error: exchange port data "
2191                               "command not supported by adapter %s\n",
2192                               zfcp_get_busid_by_adapter(adapter));
2193                 return -EOPNOTSUPP;
2194         }
2195
2196         timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
2197         if (!timer)
2198                 return -ENOMEM;
2199
2200         /* setup new FSF request */
2201         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2202                                      0, 0, &lock_flags, &fsf_req);
2203         if (retval < 0) {
2204                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2205                               "exchange port data request for"
2206                               "the adapter %s.\n",
2207                               zfcp_get_busid_by_adapter(adapter));
2208                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2209                                         lock_flags);
2210                 goto out;
2211         }
2212
2213         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2214         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2215         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2216
2217         fsf_req->data.port_data = data;
2218
2219         init_timer(timer);
2220         timer->function = zfcp_fsf_request_timeout_handler;
2221         timer->data = (unsigned long) adapter;
2222         timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
2223
2224         retval = zfcp_fsf_req_send(fsf_req, timer);
2225         if (retval) {
2226                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2227                               "command on the adapter %s\n",
2228                               zfcp_get_busid_by_adapter(adapter));
2229                 zfcp_fsf_req_free(fsf_req);
2230                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2231                                         lock_flags);
2232                 goto out;
2233         }
2234
2235         ZFCP_LOG_DEBUG("Exchange Port Data request initiated (adapter %s)\n",
2236                        zfcp_get_busid_by_adapter(adapter));
2237
2238         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2239                                 lock_flags);
2240
2241         wait_event(fsf_req->completion_wq,
2242                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2243         del_timer_sync(timer);
2244         zfcp_fsf_req_free(fsf_req);
2245  out:
2246         kfree(timer);
2247         return retval;
2248 }
2249
2250
2251 /**
2252  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2253  * @fsf_req: pointer to struct zfcp_fsf_req
2254  */
2255 static void
2256 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2257 {
2258         struct fsf_qtcb_bottom_port *bottom;
2259         struct fsf_qtcb_bottom_port *data = fsf_req->data.port_data;
2260
2261         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2262                 return;
2263
2264         switch (fsf_req->qtcb->header.fsf_status) {
2265         case FSF_GOOD:
2266                 bottom = &fsf_req->qtcb->bottom.port;
2267                 memcpy(data, bottom, sizeof(*data));
2268                 break;
2269
2270         default:
2271                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "xchg-port-ng");
2272                 debug_event(fsf_req->adapter->erp_dbf, 0,
2273                             &fsf_req->qtcb->header.fsf_status, sizeof(u32));
2274         }
2275 }
2276
2277
2278 /*
2279  * function:    zfcp_fsf_open_port
2280  *
2281  * purpose:
2282  *
2283  * returns:     address of initiated FSF request
2284  *              NULL - request could not be initiated
2285  */
2286 int
2287 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2288 {
2289         volatile struct qdio_buffer_element *sbale;
2290         unsigned long lock_flags;
2291         int retval = 0;
2292
2293         /* setup new FSF request */
2294         retval = zfcp_fsf_req_create(erp_action->adapter,
2295                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2296                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2297                                      erp_action->adapter->pool.fsf_req_erp,
2298                                      &lock_flags, &(erp_action->fsf_req));
2299         if (retval < 0) {
2300                 ZFCP_LOG_INFO("error: Could not create open port request "
2301                               "for port 0x%016Lx on adapter %s.\n",
2302                               erp_action->port->wwpn,
2303                               zfcp_get_busid_by_adapter(erp_action->adapter));
2304                 goto out;
2305         }
2306
2307         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2308                                     erp_action->fsf_req->sbal_curr, 0);
2309         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2310         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2311
2312         erp_action->fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2313         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2314         erp_action->fsf_req->data.open_port.port = erp_action->port;
2315         erp_action->fsf_req->erp_action = erp_action;
2316
2317         /* start QDIO request for this FSF request */
2318         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2319         if (retval) {
2320                 ZFCP_LOG_INFO("error: Could not send open port request for "
2321                               "port 0x%016Lx on adapter %s.\n",
2322                               erp_action->port->wwpn,
2323                               zfcp_get_busid_by_adapter(erp_action->adapter));
2324                 zfcp_fsf_req_free(erp_action->fsf_req);
2325                 erp_action->fsf_req = NULL;
2326                 goto out;
2327         }
2328
2329         ZFCP_LOG_DEBUG("open port request initiated "
2330                        "(adapter %s,  port 0x%016Lx)\n",
2331                        zfcp_get_busid_by_adapter(erp_action->adapter),
2332                        erp_action->port->wwpn);
2333  out:
2334         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2335                                 lock_flags);
2336         return retval;
2337 }
2338
2339 /*
2340  * function:    zfcp_fsf_open_port_handler
2341  *
2342  * purpose:     is called for finished Open Port command
2343  *
2344  * returns:
2345  */
2346 static int
2347 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2348 {
2349         int retval = -EINVAL;
2350         struct zfcp_port *port;
2351         struct fsf_plogi *plogi;
2352         struct fsf_qtcb_header *header;
2353         u16 subtable, rule, counter;
2354
2355         port = fsf_req->data.open_port.port;
2356         header = &fsf_req->qtcb->header;
2357
2358         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2359                 /* don't change port status in our bookkeeping */
2360                 goto skip_fsfstatus;
2361         }
2362
2363         /* evaluate FSF status in QTCB */
2364         switch (header->fsf_status) {
2365
2366         case FSF_PORT_ALREADY_OPEN:
2367                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2368                                 "is already open.\n",
2369                                 port->wwpn, zfcp_get_busid_by_port(port));
2370                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2371                                      "fsf_s_popen");
2372                 /*
2373                  * This is a bug, however operation should continue normally
2374                  * if it is simply ignored
2375                  */
2376                 break;
2377
2378         case FSF_ACCESS_DENIED:
2379                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2380                                 "on adapter %s\n",
2381                                 port->wwpn, zfcp_get_busid_by_port(port));
2382                 for (counter = 0; counter < 2; counter++) {
2383                         subtable = header->fsf_status_qual.halfword[counter * 2];
2384                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2385                         switch (subtable) {
2386                         case FSF_SQ_CFDC_SUBTABLE_OS:
2387                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2388                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2389                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2390                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2391                                         zfcp_act_subtable_type[subtable], rule);
2392                                 break;
2393                         }
2394                 }
2395                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2396                 zfcp_erp_port_access_denied(port);
2397                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2398                 break;
2399
2400         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2401                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2402                               "The remote port 0x%016Lx on adapter %s "
2403                               "could not be opened. Disabling it.\n",
2404                               port->wwpn, zfcp_get_busid_by_port(port));
2405                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2406                                  "fsf_s_max_ports");
2407                 zfcp_erp_port_failed(port);
2408                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2409                 break;
2410
2411         case FSF_ADAPTER_STATUS_AVAILABLE:
2412                 switch (header->fsf_status_qual.word[0]) {
2413                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2414                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2415                                          "fsf_sq_ltest");
2416                         /* ERP strategy will escalate */
2417                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2418                         break;
2419                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2420                         /* ERP strategy will escalate */
2421                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2422                                          "fsf_sq_ulp");
2423                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2424                         break;
2425                 case FSF_SQ_NO_RETRY_POSSIBLE:
2426                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2427                                         "adapter %s could not be opened. "
2428                                         "Disabling it.\n",
2429                                         port->wwpn,
2430                                         zfcp_get_busid_by_port(port));
2431                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2432                                              "fsf_sq_no_retry");
2433                         zfcp_erp_port_failed(port);
2434                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2435                         break;
2436                 default:
2437                         ZFCP_LOG_NORMAL
2438                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2439                              header->fsf_status_qual.word[0]);
2440                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2441                                          "fsf_sq_inval:");
2442                         debug_exception(
2443                                 fsf_req->adapter->erp_dbf, 0,
2444                                 &header->fsf_status_qual.word[0],
2445                                 sizeof (u32));
2446                         break;
2447                 }
2448                 break;
2449
2450         case FSF_GOOD:
2451                 /* save port handle assigned by FSF */
2452                 port->handle = header->port_handle;
2453                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2454                               "was opened, it's port handle is 0x%x\n",
2455                               port->wwpn, zfcp_get_busid_by_port(port),
2456                               port->handle);
2457                 /* mark port as open */
2458                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2459                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2460                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2461                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2462                                   &port->status);
2463                 retval = 0;
2464                 /* check whether D_ID has changed during open */
2465                 /*
2466                  * FIXME: This check is not airtight, as the FCP channel does
2467                  * not monitor closures of target port connections caused on
2468                  * the remote side. Thus, they might miss out on invalidating
2469                  * locally cached WWPNs (and other N_Port parameters) of gone
2470                  * target ports. So, our heroic attempt to make things safe
2471                  * could be undermined by 'open port' response data tagged with
2472                  * obsolete WWPNs. Another reason to monitor potential
2473                  * connection closures ourself at least (by interpreting
2474                  * incoming ELS' and unsolicited status). It just crosses my
2475                  * mind that one should be able to cross-check by means of
2476                  * another GID_PN straight after a port has been opened.
2477                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2478                  */
2479                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2480                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2481                 {
2482                         if (fsf_req->qtcb->bottom.support.els1_length <
2483                             ((((unsigned long) &plogi->serv_param.wwpn) -
2484                               ((unsigned long) plogi)) + sizeof (u64))) {
2485                                 ZFCP_LOG_INFO(
2486                                         "warning: insufficient length of "
2487                                         "PLOGI payload (%i)\n",
2488                                         fsf_req->qtcb->bottom.support.els1_length);
2489                                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
2490                                                  "fsf_s_short_plogi:");
2491                                 /* skip sanity check and assume wwpn is ok */
2492                         } else {
2493                                 if (plogi->serv_param.wwpn != port->wwpn) {
2494                                         ZFCP_LOG_INFO("warning: d_id of port "
2495                                                       "0x%016Lx changed during "
2496                                                       "open\n", port->wwpn);
2497                                         debug_text_event(
2498                                                 fsf_req->adapter->erp_dbf, 0,
2499                                                 "fsf_s_did_change:");
2500                                         atomic_clear_mask(
2501                                                 ZFCP_STATUS_PORT_DID_DID,
2502                                                 &port->status);
2503                                 } else
2504                                         port->wwnn = plogi->serv_param.wwnn;
2505                         }
2506                 }
2507                 break;
2508
2509         case FSF_UNKNOWN_OP_SUBTYPE:
2510                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2511                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2512                               "op_subtype=0x%x)\n",
2513                               zfcp_get_busid_by_port(port),
2514                               fsf_req->qtcb->bottom.support.operation_subtype);
2515                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2516                 break;
2517
2518         default:
2519                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2520                                 "(debug info 0x%x)\n",
2521                                 header->fsf_status);
2522                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2523                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2524                                 &header->fsf_status, sizeof (u32));
2525                 break;
2526         }
2527
2528  skip_fsfstatus:
2529         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2530         return retval;
2531 }
2532
2533 /*
2534  * function:    zfcp_fsf_close_port
2535  *
2536  * purpose:     submit FSF command "close port"
2537  *
2538  * returns:     address of initiated FSF request
2539  *              NULL - request could not be initiated
2540  */
2541 int
2542 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2543 {
2544         volatile struct qdio_buffer_element *sbale;
2545         unsigned long lock_flags;
2546         int retval = 0;
2547
2548         /* setup new FSF request */
2549         retval = zfcp_fsf_req_create(erp_action->adapter,
2550                                      FSF_QTCB_CLOSE_PORT,
2551                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2552                                      erp_action->adapter->pool.fsf_req_erp,
2553                                      &lock_flags, &(erp_action->fsf_req));
2554         if (retval < 0) {
2555                 ZFCP_LOG_INFO("error: Could not create a close port request "
2556                               "for port 0x%016Lx on adapter %s.\n",
2557                               erp_action->port->wwpn,
2558                               zfcp_get_busid_by_adapter(erp_action->adapter));
2559                 goto out;
2560         }
2561
2562         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2563                                     erp_action->fsf_req->sbal_curr, 0);
2564         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2565         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2566
2567         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2568         erp_action->fsf_req->data.close_port.port = erp_action->port;
2569         erp_action->fsf_req->erp_action = erp_action;
2570         erp_action->fsf_req->qtcb->header.port_handle =
2571             erp_action->port->handle;
2572
2573         /* start QDIO request for this FSF request */
2574         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2575         if (retval) {
2576                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2577                               "port 0x%016Lx on adapter %s.\n",
2578                               erp_action->port->wwpn,
2579                               zfcp_get_busid_by_adapter(erp_action->adapter));
2580                 zfcp_fsf_req_free(erp_action->fsf_req);
2581                 erp_action->fsf_req = NULL;
2582                 goto out;
2583         }
2584
2585         ZFCP_LOG_TRACE("close port request initiated "
2586                        "(adapter %s, port 0x%016Lx)\n",
2587                        zfcp_get_busid_by_adapter(erp_action->adapter),
2588                        erp_action->port->wwpn);
2589  out:
2590         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2591                                 lock_flags);
2592         return retval;
2593 }
2594
2595 /*
2596  * function:    zfcp_fsf_close_port_handler
2597  *
2598  * purpose:     is called for finished Close Port FSF command
2599  *
2600  * returns:
2601  */
2602 static int
2603 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2604 {
2605         int retval = -EINVAL;
2606         struct zfcp_port *port;
2607
2608         port = fsf_req->data.close_port.port;
2609
2610         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2611                 /* don't change port status in our bookkeeping */
2612                 goto skip_fsfstatus;
2613         }
2614
2615         /* evaluate FSF status in QTCB */
2616         switch (fsf_req->qtcb->header.fsf_status) {
2617
2618         case FSF_PORT_HANDLE_NOT_VALID:
2619                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2620                               "0x%016Lx on adapter %s invalid. This may happen "
2621                               "occasionally.\n", port->handle,
2622                               port->wwpn, zfcp_get_busid_by_port(port));
2623                 ZFCP_LOG_DEBUG("status qualifier:\n");
2624                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2625                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2626                               sizeof (union fsf_status_qual));
2627                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2628                                  "fsf_s_phand_nv");
2629                 zfcp_erp_adapter_reopen(port->adapter, 0);
2630                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2631                 break;
2632
2633         case FSF_ADAPTER_STATUS_AVAILABLE:
2634                 /* Note: FSF has actually closed the port in this case.
2635                  * The status code is just daft. Fingers crossed for a change
2636                  */
2637                 retval = 0;
2638                 break;
2639
2640         case FSF_GOOD:
2641                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2642                                "port handle 0x%x\n", port->wwpn,
2643                                zfcp_get_busid_by_port(port), port->handle);
2644                 zfcp_erp_modify_port_status(port,
2645                                             ZFCP_STATUS_COMMON_OPEN,
2646                                             ZFCP_CLEAR);
2647                 retval = 0;
2648                 break;
2649
2650         default:
2651                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2652                                 "(debug info 0x%x)\n",
2653                                 fsf_req->qtcb->header.fsf_status);
2654                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2655                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2656                                 &fsf_req->qtcb->header.fsf_status,
2657                                 sizeof (u32));
2658                 break;
2659         }
2660
2661  skip_fsfstatus:
2662         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2663         return retval;
2664 }
2665
2666 /*
2667  * function:    zfcp_fsf_close_physical_port
2668  *
2669  * purpose:     submit FSF command "close physical port"
2670  *
2671  * returns:     address of initiated FSF request
2672  *              NULL - request could not be initiated
2673  */
2674 int
2675 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2676 {
2677         int retval = 0;
2678         unsigned long lock_flags;
2679         volatile struct qdio_buffer_element *sbale;
2680
2681         /* setup new FSF request */
2682         retval = zfcp_fsf_req_create(erp_action->adapter,
2683                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2684                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2685                                      erp_action->adapter->pool.fsf_req_erp,
2686                                      &lock_flags, &erp_action->fsf_req);
2687         if (retval < 0) {
2688                 ZFCP_LOG_INFO("error: Could not create close physical port "
2689                               "request (adapter %s, port 0x%016Lx)\n",
2690                               zfcp_get_busid_by_adapter(erp_action->adapter),
2691                               erp_action->port->wwpn);
2692
2693                 goto out;
2694         }
2695
2696         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2697                                     erp_action->fsf_req->sbal_curr, 0);
2698         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2699         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2700
2701         /* mark port as being closed */
2702         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2703                         &erp_action->port->status);
2704         /* save a pointer to this port */
2705         erp_action->fsf_req->data.close_physical_port.port = erp_action->port;
2706         /* port to be closeed */
2707         erp_action->fsf_req->qtcb->header.port_handle =
2708             erp_action->port->handle;
2709         erp_action->fsf_req->erp_action = erp_action;
2710
2711         /* start QDIO request for this FSF request */
2712         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2713         if (retval) {
2714                 ZFCP_LOG_INFO("error: Could not send close physical port "
2715                               "request (adapter %s, port 0x%016Lx)\n",
2716                               zfcp_get_busid_by_adapter(erp_action->adapter),
2717                               erp_action->port->wwpn);
2718                 zfcp_fsf_req_free(erp_action->fsf_req);
2719                 erp_action->fsf_req = NULL;
2720                 goto out;
2721         }
2722
2723         ZFCP_LOG_TRACE("close physical port request initiated "
2724                        "(adapter %s, port 0x%016Lx)\n",
2725                        zfcp_get_busid_by_adapter(erp_action->adapter),
2726                        erp_action->port->wwpn);
2727  out:
2728         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2729                                 lock_flags);
2730         return retval;
2731 }
2732
2733 /*
2734  * function:    zfcp_fsf_close_physical_port_handler
2735  *
2736  * purpose:     is called for finished Close Physical Port FSF command
2737  *
2738  * returns:
2739  */
2740 static int
2741 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2742 {
2743         int retval = -EINVAL;
2744         struct zfcp_port *port;
2745         struct zfcp_unit *unit;
2746         struct fsf_qtcb_header *header;
2747         u16 subtable, rule, counter;
2748
2749         port = fsf_req->data.close_physical_port.port;
2750         header = &fsf_req->qtcb->header;
2751
2752         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2753                 /* don't change port status in our bookkeeping */
2754                 goto skip_fsfstatus;
2755         }
2756
2757         /* evaluate FSF status in QTCB */
2758         switch (header->fsf_status) {
2759
2760         case FSF_PORT_HANDLE_NOT_VALID:
2761                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2762                               "(adapter %s, port 0x%016Lx). "
2763                               "This may happen occasionally.\n",
2764                               port->handle,
2765                               zfcp_get_busid_by_port(port),
2766                               port->wwpn);
2767                 ZFCP_LOG_DEBUG("status qualifier:\n");
2768                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2769                               (char *) &header->fsf_status_qual,
2770                               sizeof (union fsf_status_qual));
2771                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2772                                  "fsf_s_phand_nv");
2773                 zfcp_erp_adapter_reopen(port->adapter, 0);
2774                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2775                 break;
2776
2777         case FSF_ACCESS_DENIED:
2778                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2779                                 "physical port 0x%016Lx on adapter %s\n",
2780                                 port->wwpn, zfcp_get_busid_by_port(port));
2781                 for (counter = 0; counter < 2; counter++) {
2782                         subtable = header->fsf_status_qual.halfword[counter * 2];
2783                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2784                         switch (subtable) {
2785                         case FSF_SQ_CFDC_SUBTABLE_OS:
2786                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2787                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2788                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2789                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2790                                         zfcp_act_subtable_type[subtable], rule);
2791                                 break;
2792                         }
2793                 }
2794                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2795                 zfcp_erp_port_access_denied(port);
2796                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2797                 break;
2798
2799         case FSF_PORT_BOXED:
2800                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2801                                "%s needs to be reopened but it was attempted "
2802                                "to close it physically.\n",
2803                                port->wwpn,
2804                                zfcp_get_busid_by_port(port));
2805                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_pboxed");
2806                 zfcp_erp_port_boxed(port);
2807                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2808                         ZFCP_STATUS_FSFREQ_RETRY;
2809                 break;
2810
2811         case FSF_ADAPTER_STATUS_AVAILABLE:
2812                 switch (header->fsf_status_qual.word[0]) {
2813                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2814                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2815                                          "fsf_sq_ltest");
2816                         /* This will now be escalated by ERP */
2817                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2818                         break;
2819                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2820                         /* ERP strategy will escalate */
2821                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2822                                          "fsf_sq_ulp");
2823                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2824                         break;
2825                 default:
2826                         ZFCP_LOG_NORMAL
2827                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2828                              header->fsf_status_qual.word[0]);
2829                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2830                                          "fsf_sq_inval:");
2831                         debug_exception(
2832                                 fsf_req->adapter->erp_dbf, 0,
2833                                 &header->fsf_status_qual.word[0], sizeof (u32));
2834                         break;
2835                 }
2836                 break;
2837
2838         case FSF_GOOD:
2839                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2840                                "physically closed, port handle 0x%x\n",
2841                                port->wwpn,
2842                                zfcp_get_busid_by_port(port), port->handle);
2843                 /* can't use generic zfcp_erp_modify_port_status because
2844                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2845                  */
2846                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2847                 list_for_each_entry(unit, &port->unit_list_head, list)
2848                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2849                 retval = 0;
2850                 break;
2851
2852         default:
2853                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2854                                 "(debug info 0x%x)\n",
2855                                 header->fsf_status);
2856                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2857                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2858                                 &header->fsf_status, sizeof (u32));
2859                 break;
2860         }
2861
2862  skip_fsfstatus:
2863         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2864         return retval;
2865 }
2866
2867 /*
2868  * function:    zfcp_fsf_open_unit
2869  *
2870  * purpose:
2871  *
2872  * returns:
2873  *
2874  * assumptions: This routine does not check whether the associated
2875  *              remote port has already been opened. This should be
2876  *              done by calling routines. Otherwise some status
2877  *              may be presented by FSF
2878  */
2879 int
2880 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2881 {
2882         volatile struct qdio_buffer_element *sbale;
2883         unsigned long lock_flags;
2884         int retval = 0;
2885
2886         /* setup new FSF request */
2887         retval = zfcp_fsf_req_create(erp_action->adapter,
2888                                      FSF_QTCB_OPEN_LUN,
2889                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2890                                      erp_action->adapter->pool.fsf_req_erp,
2891                                      &lock_flags, &(erp_action->fsf_req));
2892         if (retval < 0) {
2893                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2894                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2895                               erp_action->unit->fcp_lun,
2896                               erp_action->unit->port->wwpn,
2897                               zfcp_get_busid_by_adapter(erp_action->adapter));
2898                 goto out;
2899         }
2900
2901         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2902                                     erp_action->fsf_req->sbal_curr, 0);
2903         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2904         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2905
2906         erp_action->fsf_req->qtcb->header.port_handle =
2907                 erp_action->port->handle;
2908         erp_action->fsf_req->qtcb->bottom.support.fcp_lun =
2909                 erp_action->unit->fcp_lun;
2910         erp_action->fsf_req->qtcb->bottom.support.option =
2911                 FSF_OPEN_LUN_SUPPRESS_BOXING;
2912         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2913         erp_action->fsf_req->data.open_unit.unit = erp_action->unit;
2914         erp_action->fsf_req->erp_action = erp_action;
2915
2916         /* start QDIO request for this FSF request */
2917         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2918         if (retval) {
2919                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2920                               "on the adapter %s, port 0x%016Lx for "
2921                               "unit 0x%016Lx\n",
2922                               zfcp_get_busid_by_adapter(erp_action->adapter),
2923                               erp_action->port->wwpn,
2924                               erp_action->unit->fcp_lun);
2925                 zfcp_fsf_req_free(erp_action->fsf_req);
2926                 erp_action->fsf_req = NULL;
2927                 goto out;
2928         }
2929
2930         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2931                        "port 0x%016Lx, unit 0x%016Lx)\n",
2932                        zfcp_get_busid_by_adapter(erp_action->adapter),
2933                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2934  out:
2935         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2936                                 lock_flags);
2937         return retval;
2938 }
2939
2940 /*
2941  * function:    zfcp_fsf_open_unit_handler
2942  *
2943  * purpose:     is called for finished Open LUN command
2944  *
2945  * returns:
2946  */
2947 static int
2948 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2949 {
2950         int retval = -EINVAL;
2951         struct zfcp_adapter *adapter;
2952         struct zfcp_unit *unit;
2953         struct fsf_qtcb_header *header;
2954         struct fsf_qtcb_bottom_support *bottom;
2955         struct fsf_queue_designator *queue_designator;
2956         u16 subtable, rule, counter;
2957         u32 allowed, exclusive, readwrite;
2958
2959         unit = fsf_req->data.open_unit.unit;
2960
2961         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2962                 /* don't change unit status in our bookkeeping */
2963                 goto skip_fsfstatus;
2964         }
2965
2966         adapter = fsf_req->adapter;
2967         header = &fsf_req->qtcb->header;
2968         bottom = &fsf_req->qtcb->bottom.support;
2969         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
2970
2971         allowed   = bottom->lun_access_info & FSF_UNIT_ACCESS_OPEN_LUN_ALLOWED;
2972         exclusive = bottom->lun_access_info & FSF_UNIT_ACCESS_EXCLUSIVE;
2973         readwrite = bottom->lun_access_info & FSF_UNIT_ACCESS_OUTBOUND_TRANSFER;
2974
2975         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2976                           ZFCP_STATUS_UNIT_SHARED |
2977                           ZFCP_STATUS_UNIT_READONLY,
2978                           &unit->status);
2979
2980         /* evaluate FSF status in QTCB */
2981         switch (header->fsf_status) {
2982
2983         case FSF_PORT_HANDLE_NOT_VALID:
2984                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
2985                               "for port 0x%016Lx on adapter %s invalid "
2986                               "This may happen occasionally\n",
2987                               unit->port->handle,
2988                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
2989                 ZFCP_LOG_DEBUG("status qualifier:\n");
2990                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2991                               (char *) &header->fsf_status_qual,
2992                               sizeof (union fsf_status_qual));
2993                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_ph_nv");
2994                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
2995                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2996                 break;
2997
2998         case FSF_LUN_ALREADY_OPEN:
2999                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3000                                 "remote port 0x%016Lx on adapter %s twice.\n",
3001                                 unit->fcp_lun,
3002                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3003                 debug_text_exception(adapter->erp_dbf, 0,
3004                                      "fsf_s_uopen");
3005                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3006                 break;
3007
3008         case FSF_ACCESS_DENIED:
3009                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3010                                 "remote port 0x%016Lx on adapter %s\n",
3011                                 unit->fcp_lun, unit->port->wwpn,
3012                                 zfcp_get_busid_by_unit(unit));
3013                 for (counter = 0; counter < 2; counter++) {
3014                         subtable = header->fsf_status_qual.halfword[counter * 2];
3015                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3016                         switch (subtable) {
3017                         case FSF_SQ_CFDC_SUBTABLE_OS:
3018                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3019                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3020                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3021                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3022                                         zfcp_act_subtable_type[subtable], rule);
3023                                 break;
3024                         }
3025                 }
3026                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
3027                 zfcp_erp_unit_access_denied(unit);
3028                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3029                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3030                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3031                 break;
3032
3033         case FSF_PORT_BOXED:
3034                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3035                                "needs to be reopened\n",
3036                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3037                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
3038                 zfcp_erp_port_boxed(unit->port);
3039                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3040                         ZFCP_STATUS_FSFREQ_RETRY;
3041                 break;
3042
3043         case FSF_LUN_SHARING_VIOLATION:
3044                 if (header->fsf_status_qual.word[0] != 0) {
3045                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3046                                         "with WWPN 0x%Lx "
3047                                         "connected to the adapter %s "
3048                                         "is already in use in LPAR%d, CSS%d\n",
3049                                         unit->fcp_lun,
3050                                         unit->port->wwpn,
3051                                         zfcp_get_busid_by_unit(unit),
3052                                         queue_designator->hla,
3053                                         queue_designator->cssid);
3054                 } else {
3055                         subtable = header->fsf_status_qual.halfword[4];
3056                         rule = header->fsf_status_qual.halfword[5];
3057                         switch (subtable) {
3058                         case FSF_SQ_CFDC_SUBTABLE_OS:
3059                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3060                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3061                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3062                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3063                                                 "remote port with WWPN 0x%Lx "
3064                                                 "connected to the adapter %s "
3065                                                 "is denied (%s rule %d)\n",
3066                                                 unit->fcp_lun,
3067                                                 unit->port->wwpn,
3068                                                 zfcp_get_busid_by_unit(unit),
3069                                                 zfcp_act_subtable_type[subtable],
3070                                                 rule);
3071                                 break;
3072                         }
3073                 }
3074                 ZFCP_LOG_DEBUG("status qualifier:\n");
3075                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3076                               (char *) &header->fsf_status_qual,
3077                               sizeof (union fsf_status_qual));
3078                 debug_text_event(adapter->erp_dbf, 2,
3079                                  "fsf_s_l_sh_vio");
3080                 zfcp_erp_unit_access_denied(unit);
3081                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3082                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3083                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3084                 break;
3085
3086         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3087                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3088                               "There is no handle (temporary port identifier) "
3089                               "available for unit 0x%016Lx on port 0x%016Lx "
3090                               "on adapter %s\n",
3091                               unit->fcp_lun,
3092                               unit->port->wwpn,
3093                               zfcp_get_busid_by_unit(unit));
3094                 debug_text_event(adapter->erp_dbf, 1,
3095                                  "fsf_s_max_units");
3096                 zfcp_erp_unit_failed(unit);
3097                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3098                 break;
3099
3100         case FSF_ADAPTER_STATUS_AVAILABLE:
3101                 switch (header->fsf_status_qual.word[0]) {
3102                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3103                         /* Re-establish link to port */
3104                         debug_text_event(adapter->erp_dbf, 1,
3105                                          "fsf_sq_ltest");
3106                         zfcp_test_link(unit->port);
3107                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3108                         break;
3109                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3110                         /* ERP strategy will escalate */
3111                         debug_text_event(adapter->erp_dbf, 1,
3112                                          "fsf_sq_ulp");
3113                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3114                         break;
3115                 default:
3116                         ZFCP_LOG_NORMAL
3117                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3118                              header->fsf_status_qual.word[0]);
3119                         debug_text_event(adapter->erp_dbf, 0,
3120                                          "fsf_sq_inval:");
3121                         debug_exception(adapter->erp_dbf, 0,
3122                                         &header->fsf_status_qual.word[0],
3123                                 sizeof (u32));
3124                 }
3125                 break;
3126
3127         case FSF_INVALID_COMMAND_OPTION:
3128                 ZFCP_LOG_NORMAL(
3129                         "Invalid option 0x%x has been specified "
3130                         "in QTCB bottom sent to the adapter %s\n",
3131                         bottom->option,
3132                         zfcp_get_busid_by_adapter(adapter));
3133                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3134                 retval = -EINVAL;
3135                 break;
3136
3137         case FSF_GOOD:
3138                 /* save LUN handle assigned by FSF */
3139                 unit->handle = header->lun_handle;
3140                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3141                                "adapter %s opened, port handle 0x%x\n",
3142                                unit->fcp_lun,
3143                                unit->port->wwpn,
3144                                zfcp_get_busid_by_unit(unit),
3145                                unit->handle);
3146                 /* mark unit as open */
3147                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3148                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
3149                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
3150                                   &unit->status);
3151                 if (adapter->supported_features & FSF_FEATURE_LUN_SHARING){
3152                         if (!exclusive)
3153                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3154                                                 &unit->status);
3155
3156                         if (!readwrite) {
3157                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3158                                                 &unit->status);
3159                                 ZFCP_LOG_NORMAL("read-only access for unit "
3160                                                 "(adapter %s, wwpn=0x%016Lx, "
3161                                                 "fcp_lun=0x%016Lx)\n",
3162                                                 zfcp_get_busid_by_unit(unit),
3163                                                 unit->port->wwpn,
3164                                                 unit->fcp_lun);
3165                         }
3166
3167                         if (exclusive && !readwrite) {
3168                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3169                                                 "unit not supported\n");
3170                                 zfcp_erp_unit_failed(unit);
3171                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3172                                 zfcp_erp_unit_shutdown(unit, 0);
3173                         } else if (!exclusive && readwrite) {
3174                                 ZFCP_LOG_NORMAL("shared access of read-write "
3175                                                 "unit not supported\n");
3176                                 zfcp_erp_unit_failed(unit);
3177                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3178                                 zfcp_erp_unit_shutdown(unit, 0);
3179                         }
3180                 }
3181
3182                 retval = 0;
3183                 break;
3184
3185         default:
3186                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3187                                 "(debug info 0x%x)\n",
3188                                 header->fsf_status);
3189                 debug_text_event(adapter->erp_dbf, 0, "fsf_s_inval:");
3190                 debug_exception(adapter->erp_dbf, 0,
3191                                 &header->fsf_status, sizeof (u32));
3192                 break;
3193         }
3194
3195  skip_fsfstatus:
3196         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3197         return retval;
3198 }
3199
3200 /*
3201  * function:    zfcp_fsf_close_unit
3202  *
3203  * purpose:
3204  *
3205  * returns:     address of fsf_req - request successfully initiated
3206  *              NULL -
3207  *
3208  * assumptions: This routine does not check whether the associated
3209  *              remote port/lun has already been opened. This should be
3210  *              done by calling routines. Otherwise some status
3211  *              may be presented by FSF
3212  */
3213 int
3214 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3215 {
3216         volatile struct qdio_buffer_element *sbale;
3217         unsigned long lock_flags;
3218         int retval = 0;
3219
3220         /* setup new FSF request */
3221         retval = zfcp_fsf_req_create(erp_action->adapter,
3222                                      FSF_QTCB_CLOSE_LUN,
3223                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3224                                      erp_action->adapter->pool.fsf_req_erp,
3225                                      &lock_flags, &(erp_action->fsf_req));
3226         if (retval < 0) {
3227                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3228                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3229                               erp_action->unit->fcp_lun,
3230                               erp_action->port->wwpn,
3231                               zfcp_get_busid_by_adapter(erp_action->adapter));
3232                 goto out;
3233         }
3234
3235         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
3236                                     erp_action->fsf_req->sbal_curr, 0);
3237         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3238         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3239
3240         erp_action->fsf_req->qtcb->header.port_handle =
3241             erp_action->port->handle;
3242         erp_action->fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3243         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3244         erp_action->fsf_req->data.close_unit.unit = erp_action->unit;
3245         erp_action->fsf_req->erp_action = erp_action;
3246
3247         /* start QDIO request for this FSF request */
3248         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
3249         if (retval) {
3250                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3251                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3252                               erp_action->unit->fcp_lun,
3253                               erp_action->port->wwpn,
3254                               zfcp_get_busid_by_adapter(erp_action->adapter));
3255                 zfcp_fsf_req_free(erp_action->fsf_req);
3256                 erp_action->fsf_req = NULL;
3257                 goto out;
3258         }
3259
3260         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3261                        "port 0x%016Lx, unit 0x%016Lx)\n",
3262                        zfcp_get_busid_by_adapter(erp_action->adapter),
3263                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3264  out:
3265         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3266                                 lock_flags);
3267         return retval;
3268 }
3269
3270 /*
3271  * function:    zfcp_fsf_close_unit_handler
3272  *
3273  * purpose:     is called for finished Close LUN FSF command
3274  *
3275  * returns:
3276  */
3277 static int
3278 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3279 {
3280         int retval = -EINVAL;
3281         struct zfcp_unit *unit;
3282
3283         unit = fsf_req->data.close_unit.unit;   /* restore unit */
3284
3285         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3286                 /* don't change unit status in our bookkeeping */
3287                 goto skip_fsfstatus;
3288         }
3289
3290         /* evaluate FSF status in QTCB */
3291         switch (fsf_req->qtcb->header.fsf_status) {
3292
3293         case FSF_PORT_HANDLE_NOT_VALID:
3294                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3295                               "0x%016Lx on adapter %s invalid. This may "
3296                               "happen in rare circumstances\n",
3297                               unit->port->handle,
3298                               unit->port->wwpn,
3299                               zfcp_get_busid_by_unit(unit));
3300                 ZFCP_LOG_DEBUG("status qualifier:\n");
3301                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3302                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3303                               sizeof (union fsf_status_qual));
3304                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3305                                  "fsf_s_phand_nv");
3306                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3307                 zfcp_cmd_dbf_event_fsf("porthinv", fsf_req,
3308                                        &fsf_req->qtcb->header.fsf_status_qual,
3309                                        sizeof (union fsf_status_qual));
3310                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3311                 break;
3312
3313         case FSF_LUN_HANDLE_NOT_VALID:
3314                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3315                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3316                               "invalid. This may happen occasionally.\n",
3317                               unit->handle,
3318                               unit->fcp_lun,
3319                               unit->port->wwpn,
3320                               zfcp_get_busid_by_unit(unit));
3321                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3322                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3323                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3324                               sizeof (union fsf_status_qual));
3325                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3326                                  "fsf_s_lhand_nv");
3327                 zfcp_erp_port_reopen(unit->port, 0);
3328                 zfcp_cmd_dbf_event_fsf("lunhinv", fsf_req,
3329                                        &fsf_req->qtcb->header.fsf_status_qual,
3330                                        sizeof (union fsf_status_qual));
3331                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3332                 break;
3333
3334         case FSF_PORT_BOXED:
3335                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3336                                "needs to be reopened\n",
3337                                unit->port->wwpn,
3338                                zfcp_get_busid_by_unit(unit));
3339                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3340                 zfcp_erp_port_boxed(unit->port);
3341                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3342                         ZFCP_STATUS_FSFREQ_RETRY;
3343                 break;
3344
3345         case FSF_ADAPTER_STATUS_AVAILABLE:
3346                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3347                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3348                         /* re-establish link to port */
3349                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3350                                          "fsf_sq_ltest");
3351                         zfcp_test_link(unit->port);
3352                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3353                         break;
3354                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3355                         /* ERP strategy will escalate */
3356                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3357                                          "fsf_sq_ulp");
3358                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3359                         break;
3360                 default:
3361                         ZFCP_LOG_NORMAL
3362                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3363                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3364                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3365                                          "fsf_sq_inval:");
3366                         debug_exception(
3367                                 fsf_req->adapter->erp_dbf, 0,
3368                                 &fsf_req->qtcb->header.fsf_status_qual.word[0],
3369                                 sizeof (u32));
3370                         break;
3371                 }
3372                 break;
3373
3374         case FSF_GOOD:
3375                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3376                                "closed, port handle 0x%x\n",
3377                                unit->fcp_lun,
3378                                unit->port->wwpn,
3379                                zfcp_get_busid_by_unit(unit),
3380                                unit->handle);
3381                 /* mark unit as closed */
3382                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3383                 retval = 0;
3384                 break;
3385
3386         default:
3387                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3388                                 "(debug info 0x%x)\n",
3389                                 fsf_req->qtcb->header.fsf_status);
3390                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3391                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3392                                 &fsf_req->qtcb->header.fsf_status,
3393                                 sizeof (u32));
3394                 break;
3395         }
3396
3397  skip_fsfstatus:
3398         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3399         return retval;
3400 }
3401
3402 /**
3403  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3404  * @adapter: adapter where scsi command is issued
3405  * @unit: unit where command is sent to
3406  * @scsi_cmnd: scsi command to be sent
3407  * @timer: timer to be started when request is initiated
3408  * @req_flags: flags for fsf_request
3409  */
3410 int
3411 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3412                                struct zfcp_unit *unit,
3413                                struct scsi_cmnd * scsi_cmnd,
3414                                struct timer_list *timer, int req_flags)
3415 {
3416         struct zfcp_fsf_req *fsf_req = NULL;
3417         struct fcp_cmnd_iu *fcp_cmnd_iu;
3418         unsigned int sbtype;
3419         unsigned long lock_flags;
3420         int real_bytes = 0;
3421         int retval = 0;
3422         int mask;
3423
3424         /* setup new FSF request */
3425         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3426                                      adapter->pool.fsf_req_scsi,
3427                                      &lock_flags, &fsf_req);
3428         if (unlikely(retval < 0)) {
3429                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3430                                "for unit 0x%016Lx on port 0x%016Lx on "
3431                                "adapter %s\n",
3432                                unit->fcp_lun,
3433                                unit->port->wwpn,
3434                                zfcp_get_busid_by_adapter(adapter));
3435                 goto failed_req_create;
3436         }
3437
3438         /*
3439          * associate FSF request with SCSI request
3440          * (need this for look up on abort)
3441          */
3442         fsf_req->data.send_fcp_command_task.fsf_req = fsf_req;
3443         scsi_cmnd->host_scribble = (char *) &(fsf_req->data);
3444
3445         /*
3446          * associate SCSI command with FSF request
3447          * (need this for look up on normal command completion)
3448          */
3449         fsf_req->data.send_fcp_command_task.scsi_cmnd = scsi_cmnd;
3450         fsf_req->data.send_fcp_command_task.start_jiffies = jiffies;
3451         fsf_req->data.send_fcp_command_task.unit = unit;
3452         ZFCP_LOG_DEBUG("unit=%p, fcp_lun=0x%016Lx\n", unit, unit->fcp_lun);
3453
3454         /* set handles of unit and its parent port in QTCB */
3455         fsf_req->qtcb->header.lun_handle = unit->handle;
3456         fsf_req->qtcb->header.port_handle = unit->port->handle;
3457
3458         /* FSF does not define the structure of the FCP_CMND IU */
3459         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3460             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3461
3462         /*
3463          * set depending on data direction:
3464          *      data direction bits in SBALE (SB Type)
3465          *      data direction bits in QTCB
3466          *      data direction bits in FCP_CMND IU
3467          */
3468         switch (scsi_cmnd->sc_data_direction) {
3469         case DMA_NONE:
3470                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3471                 /*
3472                  * FIXME(qdio):
3473                  * what is the correct type for commands
3474                  * without 'real' data buffers?
3475                  */
3476                 sbtype = SBAL_FLAGS0_TYPE_READ;
3477                 break;
3478         case DMA_FROM_DEVICE:
3479                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3480                 sbtype = SBAL_FLAGS0_TYPE_READ;
3481                 fcp_cmnd_iu->rddata = 1;
3482                 break;
3483         case DMA_TO_DEVICE:
3484                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3485                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3486                 fcp_cmnd_iu->wddata = 1;
3487                 break;
3488         case DMA_BIDIRECTIONAL:
3489         default:
3490                 /*
3491                  * dummy, catch this condition earlier
3492                  * in zfcp_scsi_queuecommand
3493                  */
3494                 goto failed_scsi_cmnd;
3495         }
3496
3497         /* set FC service class in QTCB (3 per default) */
3498         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3499
3500         /* set FCP_LUN in FCP_CMND IU in QTCB */
3501         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3502
3503         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3504
3505         /* set task attributes in FCP_CMND IU in QTCB */
3506         if (likely((scsi_cmnd->device->simple_tags) ||
3507                    (atomic_test_mask(mask, &unit->status))))
3508                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3509         else
3510                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3511
3512         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3513         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3514                 fcp_cmnd_iu->add_fcp_cdb_length
3515                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3516                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3517                                "additional FCP_CDB length is 0x%x "
3518                                "(shifted right 2 bits)\n",
3519                                scsi_cmnd->cmd_len,
3520                                fcp_cmnd_iu->add_fcp_cdb_length);
3521         }
3522         /*
3523          * copy SCSI CDB (including additional length, if any) to
3524          * FCP_CDB in FCP_CMND IU in QTCB
3525          */
3526         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3527
3528         /* FCP CMND IU length in QTCB */
3529         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3530                 sizeof (struct fcp_cmnd_iu) +
3531                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3532
3533         /* generate SBALEs from data buffer */
3534         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3535         if (unlikely(real_bytes < 0)) {
3536                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3537                         ZFCP_LOG_DEBUG(
3538                                 "Data did not fit into available buffer(s), "
3539                                "waiting for more...\n");
3540                 retval = -EIO;
3541         } else {
3542                 ZFCP_LOG_NORMAL("error: No truncation implemented but "
3543                                 "required. Shutting down unit "
3544                                 "(adapter %s, port 0x%016Lx, "
3545                                 "unit 0x%016Lx)\n",
3546                                 zfcp_get_busid_by_unit(unit),
3547                                 unit->port->wwpn,
3548                                 unit->fcp_lun);
3549                 zfcp_erp_unit_shutdown(unit, 0);
3550                 retval = -EINVAL;
3551                 }
3552                 goto no_fit;
3553         }
3554
3555         /* set length of FCP data length in FCP_CMND IU in QTCB */
3556         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3557
3558         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3559         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3560                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3561
3562         /*
3563          * start QDIO request for this FSF request
3564          *  covered by an SBALE)
3565          */
3566         retval = zfcp_fsf_req_send(fsf_req, timer);
3567         if (unlikely(retval < 0)) {
3568                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3569                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3570                               zfcp_get_busid_by_adapter(adapter),
3571                               unit->port->wwpn,
3572                               unit->fcp_lun);
3573                 goto send_failed;
3574         }
3575
3576         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3577                        "port 0x%016Lx, unit 0x%016Lx)\n",
3578                        zfcp_get_busid_by_adapter(adapter),
3579                        unit->port->wwpn,
3580                        unit->fcp_lun);
3581         goto success;
3582
3583  send_failed:
3584  no_fit:
3585  failed_scsi_cmnd:
3586         zfcp_fsf_req_free(fsf_req);
3587         fsf_req = NULL;
3588         scsi_cmnd->host_scribble = NULL;
3589  success:
3590  failed_req_create:
3591         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3592         return retval;
3593 }
3594
3595 /*
3596  * function:    zfcp_fsf_send_fcp_command_task_management
3597  *
3598  * purpose:
3599  *
3600  * returns:
3601  *
3602  * FIXME(design): should be watched by a timeout!!!
3603  * FIXME(design) shouldn't this be modified to return an int
3604  *               also...don't know how though
3605  *
3606  */
3607 struct zfcp_fsf_req *
3608 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3609                                           struct zfcp_unit *unit,
3610                                           u8 tm_flags, int req_flags)
3611 {
3612         struct zfcp_fsf_req *fsf_req = NULL;
3613         int retval = 0;
3614         struct fcp_cmnd_iu *fcp_cmnd_iu;
3615         unsigned long lock_flags;
3616         volatile struct qdio_buffer_element *sbale;
3617
3618         /* setup new FSF request */
3619         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3620                                      adapter->pool.fsf_req_scsi,
3621                                      &lock_flags, &fsf_req);
3622         if (retval < 0) {
3623                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3624                               "management) request for adapter %s, port "
3625                               " 0x%016Lx, unit 0x%016Lx.\n",
3626                               zfcp_get_busid_by_adapter(adapter),
3627                               unit->port->wwpn, unit->fcp_lun);
3628                 goto out;
3629         }
3630
3631         /*
3632          * Used to decide on proper handler in the return path,
3633          * could be either zfcp_fsf_send_fcp_command_task_handler or
3634          * zfcp_fsf_send_fcp_command_task_management_handler */
3635
3636         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3637
3638         /*
3639          * hold a pointer to the unit being target of this
3640          * task management request
3641          */
3642         fsf_req->data.send_fcp_command_task_management.unit = unit;
3643
3644         /* set FSF related fields in QTCB */
3645         fsf_req->qtcb->header.lun_handle = unit->handle;
3646         fsf_req->qtcb->header.port_handle = unit->port->handle;
3647         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3648         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3649         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3650                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3651
3652         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3653         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3654         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3655
3656         /* set FCP related fields in FCP_CMND IU in QTCB */
3657         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3658                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3659         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3660         fcp_cmnd_iu->task_management_flags = tm_flags;
3661
3662         /* start QDIO request for this FSF request */
3663         zfcp_fsf_start_scsi_er_timer(adapter);
3664         retval = zfcp_fsf_req_send(fsf_req, NULL);
3665         if (retval) {
3666                 del_timer(&adapter->scsi_er_timer);
3667                 ZFCP_LOG_INFO("error: Could not send an FCP-command (task "
3668                               "management) on adapter %s, port 0x%016Lx for "
3669                               "unit LUN 0x%016Lx\n",
3670                               zfcp_get_busid_by_adapter(adapter),
3671                               unit->port->wwpn,
3672                               unit->fcp_lun);
3673                 zfcp_fsf_req_free(fsf_req);
3674                 fsf_req = NULL;
3675                 goto out;
3676         }
3677
3678         ZFCP_LOG_TRACE("Send FCP Command (task management function) initiated "
3679                        "(adapter %s, port 0x%016Lx, unit 0x%016Lx, "
3680                        "tm_flags=0x%x)\n",
3681                        zfcp_get_busid_by_adapter(adapter),
3682                        unit->port->wwpn,
3683                        unit->fcp_lun,
3684                        tm_flags);
3685  out:
3686         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3687         return fsf_req;
3688 }
3689
3690 /*
3691  * function:    zfcp_fsf_send_fcp_command_handler
3692  *
3693  * purpose:     is called for finished Send FCP Command
3694  *
3695  * returns:
3696  */
3697 static int
3698 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3699 {
3700         int retval = -EINVAL;
3701         struct zfcp_unit *unit;
3702         struct fsf_qtcb_header *header;
3703         u16 subtable, rule, counter;
3704
3705         header = &fsf_req->qtcb->header;
3706
3707         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3708                 unit = fsf_req->data.send_fcp_command_task_management.unit;
3709         else
3710                 unit = fsf_req->data.send_fcp_command_task.unit;
3711
3712         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3713                 /* go directly to calls of special handlers */
3714                 goto skip_fsfstatus;
3715         }
3716
3717         /* evaluate FSF status in QTCB */
3718         switch (header->fsf_status) {
3719
3720         case FSF_PORT_HANDLE_NOT_VALID:
3721                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3722                               "0x%016Lx on adapter %s invalid\n",
3723                               unit->port->handle,
3724                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3725                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3726                               (char *) &header->fsf_status_qual,
3727                               sizeof (union fsf_status_qual));
3728                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3729                                  "fsf_s_phand_nv");
3730                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3731                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3732                 break;
3733
3734         case FSF_LUN_HANDLE_NOT_VALID:
3735                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3736                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3737                               "invalid. This may happen occasionally.\n",
3738                               unit->handle,
3739                               unit->fcp_lun,
3740                               unit->port->wwpn,
3741                               zfcp_get_busid_by_unit(unit));
3742                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3743                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3744                               (char *) &header->fsf_status_qual,
3745                               sizeof (union fsf_status_qual));
3746                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3747                                  "fsf_s_uhand_nv");
3748                 zfcp_erp_port_reopen(unit->port, 0);
3749                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3750                 break;
3751
3752         case FSF_HANDLE_MISMATCH:
3753                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3754                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3755                                 "unit 0x%016Lx)\n",
3756                                 unit->port->handle,
3757                                 zfcp_get_busid_by_unit(unit),
3758                                 unit->port->wwpn,
3759                                 unit->fcp_lun);
3760                 ZFCP_LOG_NORMAL("status qualifier:\n");
3761                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3762                               (char *) &header->fsf_status_qual,
3763                               sizeof (union fsf_status_qual));
3764                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3765                                  "fsf_s_hand_mis");
3766                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3767                 zfcp_cmd_dbf_event_fsf("handmism",
3768                                        fsf_req,
3769                                        &header->fsf_status_qual,
3770                                        sizeof (union fsf_status_qual));
3771                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3772                 break;
3773
3774         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3775                 if (fsf_req->adapter->fc_service_class <= 3) {
3776                         ZFCP_LOG_NORMAL("error: The adapter %s does "
3777                                         "not support fibrechannel class %d.\n",
3778                                         zfcp_get_busid_by_unit(unit),
3779                                         fsf_req->adapter->fc_service_class);
3780                 } else {
3781                         ZFCP_LOG_NORMAL("bug: The fibrechannel class at "
3782                                         "adapter %s is invalid. "
3783                                         "(debug info %d)\n",
3784                                         zfcp_get_busid_by_unit(unit),
3785                                         fsf_req->adapter->fc_service_class);
3786                 }
3787                 /* stop operation for this adapter */
3788                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
3789                                      "fsf_s_class_nsup");
3790                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3791                 zfcp_cmd_dbf_event_fsf("unsclass",
3792                                        fsf_req,
3793                                        &header->fsf_status_qual,
3794                                        sizeof (union fsf_status_qual));
3795                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3796                 break;
3797
3798         case FSF_FCPLUN_NOT_VALID:
3799                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3800                                 "adapter %s does not have correct unit "
3801                                 "handle 0x%x\n",
3802                                 unit->fcp_lun,
3803                                 unit->port->wwpn,
3804                                 zfcp_get_busid_by_unit(unit),
3805                                 unit->handle);
3806                 ZFCP_LOG_DEBUG("status qualifier:\n");
3807                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3808                               (char *) &header->fsf_status_qual,
3809                               sizeof (union fsf_status_qual));
3810                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3811                                  "fsf_s_fcp_lun_nv");
3812                 zfcp_erp_port_reopen(unit->port, 0);
3813                 zfcp_cmd_dbf_event_fsf("fluninv",
3814                                        fsf_req,
3815                                        &header->fsf_status_qual,
3816                                        sizeof (union fsf_status_qual));
3817                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3818                 break;
3819
3820         case FSF_ACCESS_DENIED:
3821                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3822                                 "unit 0x%016Lx on port 0x%016Lx on "
3823                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3824                                 zfcp_get_busid_by_unit(unit));
3825                 for (counter = 0; counter < 2; counter++) {
3826                         subtable = header->fsf_status_qual.halfword[counter * 2];
3827                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3828                         switch (subtable) {
3829                         case FSF_SQ_CFDC_SUBTABLE_OS:
3830                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3831                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3832                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3833                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3834                                         zfcp_act_subtable_type[subtable], rule);
3835                                 break;
3836                         }
3837                 }
3838                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
3839                 zfcp_erp_unit_access_denied(unit);
3840                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3841                 break;
3842
3843         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3844                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3845                               "0x%016Lx on port 0x%016Lx on adapter %s "
3846                               "(debug info %d)\n",
3847                               unit->fcp_lun,
3848                               unit->port->wwpn,
3849                               zfcp_get_busid_by_unit(unit),
3850                               fsf_req->qtcb->bottom.io.data_direction);
3851                 /* stop operation for this adapter */
3852                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3853                                  "fsf_s_dir_ind_nv");
3854                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3855                 zfcp_cmd_dbf_event_fsf("dirinv",
3856                                        fsf_req,
3857                                        &header->fsf_status_qual,
3858                                        sizeof (union fsf_status_qual));
3859                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3860                 break;
3861
3862         case FSF_CMND_LENGTH_NOT_VALID:
3863                 ZFCP_LOG_NORMAL
3864                     ("bug: An invalid control-data-block length field "
3865                      "was found in a command for unit 0x%016Lx on port "
3866                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3867                      unit->fcp_lun, unit->port->wwpn,
3868                      zfcp_get_busid_by_unit(unit),
3869                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3870                 /* stop operation for this adapter */
3871                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3872                                  "fsf_s_cmd_len_nv");
3873                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3874                 zfcp_cmd_dbf_event_fsf("cleninv",
3875                                        fsf_req,
3876                                        &header->fsf_status_qual,
3877                                        sizeof (union fsf_status_qual));
3878                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3879                 break;
3880
3881         case FSF_PORT_BOXED:
3882                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3883                                "needs to be reopened\n",
3884                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3885                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3886                 zfcp_erp_port_boxed(unit->port);
3887                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3888                         ZFCP_STATUS_FSFREQ_RETRY;
3889                 break;
3890
3891         case FSF_LUN_BOXED:
3892                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3893                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3894                                 zfcp_get_busid_by_unit(unit),
3895                                 unit->port->wwpn, unit->fcp_lun);
3896                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
3897                 zfcp_erp_unit_boxed(unit);
3898                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3899                         | ZFCP_STATUS_FSFREQ_RETRY;
3900                 break;
3901
3902         case FSF_ADAPTER_STATUS_AVAILABLE:
3903                 switch (header->fsf_status_qual.word[0]) {
3904                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3905                         /* re-establish link to port */
3906                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3907                                          "fsf_sq_ltest");
3908                         zfcp_test_link(unit->port);
3909                         break;
3910                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3911                         /* FIXME(hw) need proper specs for proper action */
3912                         /* let scsi stack deal with retries and escalation */
3913                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3914                                          "fsf_sq_ulp");
3915                         break;
3916                 default:
3917                         ZFCP_LOG_NORMAL
3918                             ("Unknown status qualifier 0x%x arrived.\n",
3919                              header->fsf_status_qual.word[0]);
3920                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3921                                          "fsf_sq_inval:");
3922                         debug_exception(fsf_req->adapter->erp_dbf, 0,
3923                                         &header->fsf_status_qual.word[0],
3924                                         sizeof(u32));
3925                         break;
3926                 }
3927                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3928                 break;
3929
3930         case FSF_GOOD:
3931                 break;
3932
3933         case FSF_FCP_RSP_AVAILABLE:
3934                 break;
3935
3936         default:
3937                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3938                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3939                                 &header->fsf_status, sizeof(u32));
3940                 break;
3941         }
3942
3943  skip_fsfstatus:
3944         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3945                 retval =
3946                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3947         } else {
3948                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3949         }
3950         return retval;
3951 }
3952
3953 /*
3954  * function:    zfcp_fsf_send_fcp_command_task_handler
3955  *
3956  * purpose:     evaluates FCP_RSP IU
3957  *
3958  * returns:
3959  */
3960 static int
3961 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3962 {
3963         int retval = 0;
3964         struct scsi_cmnd *scpnt;
3965         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3966             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3967         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3968             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3969         u32 sns_len;
3970         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3971         unsigned long flags;
3972         struct zfcp_unit *unit = fsf_req->data.send_fcp_command_task.unit;
3973
3974         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3975         scpnt = fsf_req->data.send_fcp_command_task.scsi_cmnd;
3976         if (unlikely(!scpnt)) {
3977                 ZFCP_LOG_DEBUG
3978                     ("Command with fsf_req %p is not associated to "
3979                      "a scsi command anymore. Aborted?\n", fsf_req);
3980                 goto out;
3981         }
3982         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3983                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3984                  *        DID_SOFT_ERROR by retrying the request for devices
3985                  *        that allow retries.
3986                  */
3987                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3988                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3989                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3990                 goto skip_fsfstatus;
3991         }
3992
3993         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3994                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3995                 set_host_byte(&scpnt->result, DID_ERROR);
3996                 goto skip_fsfstatus;
3997         }
3998
3999         /* set message byte of result in SCSI command */
4000         scpnt->result |= COMMAND_COMPLETE << 8;
4001
4002         /*
4003          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
4004          * of result in SCSI command
4005          */
4006         scpnt->result |= fcp_rsp_iu->scsi_status;
4007         if (unlikely(fcp_rsp_iu->scsi_status)) {
4008                 /* DEBUG */
4009                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
4010                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4011                               scpnt->cmnd, scpnt->cmd_len);
4012                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
4013                                 fcp_rsp_iu->scsi_status);
4014                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4015                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
4016                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4017                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
4018                               fcp_rsp_iu->fcp_sns_len);
4019         }
4020
4021         /* check FCP_RSP_INFO */
4022         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
4023                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
4024                 switch (fcp_rsp_info[3]) {
4025                 case RSP_CODE_GOOD:
4026                         /* ok, continue */
4027                         ZFCP_LOG_TRACE("no failure or Task Management "
4028                                        "Function complete\n");
4029                         set_host_byte(&scpnt->result, DID_OK);
4030                         break;
4031                 case RSP_CODE_LENGTH_MISMATCH:
4032                         /* hardware bug */
4033                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4034                                         "that the fibrechannel protocol data "
4035                                         "length differs from the burst length. "
4036                                         "The problem occured on unit 0x%016Lx "
4037                                         "on port 0x%016Lx on adapter %s",
4038                                         unit->fcp_lun,
4039                                         unit->port->wwpn,
4040                                         zfcp_get_busid_by_unit(unit));
4041                         /* dump SCSI CDB as prepared by zfcp */
4042                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4043                                       (char *) &fsf_req->qtcb->
4044                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4045                         zfcp_cmd_dbf_event_fsf("clenmis", fsf_req, NULL, 0);
4046                         set_host_byte(&scpnt->result, DID_ERROR);
4047                         goto skip_fsfstatus;
4048                 case RSP_CODE_FIELD_INVALID:
4049                         /* driver or hardware bug */
4050                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4051                                         "that the fibrechannel protocol data "
4052                                         "fields were incorrectly set up. "
4053                                         "The problem occured on the unit "
4054                                         "0x%016Lx on port 0x%016Lx on "
4055                                         "adapter %s",
4056                                         unit->fcp_lun,
4057                                         unit->port->wwpn,
4058                                         zfcp_get_busid_by_unit(unit));
4059                         /* dump SCSI CDB as prepared by zfcp */
4060                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4061                                       (char *) &fsf_req->qtcb->
4062                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4063                         set_host_byte(&scpnt->result, DID_ERROR);
4064                         zfcp_cmd_dbf_event_fsf("codeinv", fsf_req, NULL, 0);
4065                         goto skip_fsfstatus;
4066                 case RSP_CODE_RO_MISMATCH:
4067                         /* hardware bug */
4068                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
4069                                         "that conflicting  values for the "
4070                                         "fibrechannel payload offset from the "
4071                                         "header were found. "
4072                                         "The problem occured on unit 0x%016Lx "
4073                                         "on port 0x%016Lx on adapter %s.\n",
4074                                         unit->fcp_lun,
4075                                         unit->port->wwpn,
4076                                         zfcp_get_busid_by_unit(unit));
4077                         /* dump SCSI CDB as prepared by zfcp */
4078                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4079                                       (char *) &fsf_req->qtcb->
4080                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4081                         zfcp_cmd_dbf_event_fsf("codemism", fsf_req, NULL, 0);
4082                         set_host_byte(&scpnt->result, DID_ERROR);
4083                         goto skip_fsfstatus;
4084                 default:
4085                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4086                                         "code was detected for a command. "
4087                                         "The problem occured on the unit "
4088                                         "0x%016Lx on port 0x%016Lx on "
4089                                         "adapter %s (debug info 0x%x)\n",
4090                                         unit->fcp_lun,
4091                                         unit->port->wwpn,
4092                                         zfcp_get_busid_by_unit(unit),
4093                                         fcp_rsp_info[3]);
4094                         /* dump SCSI CDB as prepared by zfcp */
4095                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4096                                       (char *) &fsf_req->qtcb->
4097                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4098                         zfcp_cmd_dbf_event_fsf("undeffcp", fsf_req, NULL, 0);
4099                         set_host_byte(&scpnt->result, DID_ERROR);
4100                         goto skip_fsfstatus;
4101                 }
4102         }
4103
4104         /* check for sense data */
4105         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4106                 sns_len = FSF_FCP_RSP_SIZE -
4107                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4108                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4109                                sns_len);
4110                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4111                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4112                                SCSI_SENSE_BUFFERSIZE);
4113                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4114                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4115                                scpnt->result);
4116                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4117                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4118
4119                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4120                                fcp_rsp_iu->fcp_sns_len);
4121                 memcpy(&scpnt->sense_buffer,
4122                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4123                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4124                               (void *) &scpnt->sense_buffer, sns_len);
4125         }
4126
4127         /* check for overrun */
4128         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4129                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4130                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4131                               "The response data length is "
4132                               "%d, the original length was %d.\n",
4133                               unit->fcp_lun,
4134                               unit->port->wwpn,
4135                               zfcp_get_busid_by_unit(unit),
4136                               fcp_rsp_iu->fcp_resid,
4137                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4138         }
4139
4140         /* check for underrun */
4141         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4142                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4143                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4144                               "The response data length is "
4145                               "%d, the original length was %d.\n",
4146                               unit->fcp_lun,
4147                               unit->port->wwpn,
4148                               zfcp_get_busid_by_unit(unit),
4149                               fcp_rsp_iu->fcp_resid,
4150                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4151
4152                 scpnt->resid = fcp_rsp_iu->fcp_resid;
4153                 if (scpnt->request_bufflen - scpnt->resid < scpnt->underflow)
4154                         set_host_byte(&scpnt->result, DID_ERROR);
4155         }
4156
4157  skip_fsfstatus:
4158         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4159
4160         zfcp_cmd_dbf_event_scsi("response", scpnt);
4161
4162         /* cleanup pointer (need this especially for abort) */
4163         scpnt->host_scribble = NULL;
4164
4165         /*
4166          * NOTE:
4167          * according to the outcome of a discussion on linux-scsi we
4168          * don't need to grab the io_request_lock here since we use
4169          * the new eh
4170          */
4171         /* always call back */
4172
4173         (scpnt->scsi_done) (scpnt);
4174
4175         /*
4176          * We must hold this lock until scsi_done has been called.
4177          * Otherwise we may call scsi_done after abort regarding this
4178          * command has completed.
4179          * Note: scsi_done must not block!
4180          */
4181  out:
4182         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4183         return retval;
4184 }
4185
4186 /*
4187  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4188  *
4189  * purpose:     evaluates FCP_RSP IU
4190  *
4191  * returns:
4192  */
4193 static int
4194 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4195 {
4196         int retval = 0;
4197         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4198             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4199         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4200         struct zfcp_unit *unit =
4201             fsf_req->data.send_fcp_command_task_management.unit;
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
4552 /*
4553  * function:    zfcp_fsf_req_wait_and_cleanup
4554  *
4555  * purpose:
4556  *
4557  * FIXME(design): signal seems to be <0 !!!
4558  * returns:     0       - request completed (*status is valid), cleanup succ.
4559  *              <0      - request completed (*status is valid), cleanup failed
4560  *              >0      - signal which interrupted waiting (*status invalid),
4561  *                        request not completed, no cleanup
4562  *
4563  *              *status is a copy of status of completed fsf_req
4564  */
4565 int
4566 zfcp_fsf_req_wait_and_cleanup(struct zfcp_fsf_req *fsf_req,
4567                               int interruptible, u32 * status)
4568 {
4569         int retval = 0;
4570         int signal = 0;
4571
4572         if (interruptible) {
4573                 __wait_event_interruptible(fsf_req->completion_wq,
4574                                            fsf_req->status &
4575                                            ZFCP_STATUS_FSFREQ_COMPLETED,
4576                                            signal);
4577                 if (signal) {
4578                         ZFCP_LOG_DEBUG("Caught signal %i while waiting for the "
4579                                        "completion of the request at %p\n",
4580                                        signal, fsf_req);
4581                         retval = signal;
4582                         goto out;
4583                 }
4584         } else {
4585                 __wait_event(fsf_req->completion_wq,
4586                              fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4587         }
4588
4589         *status = fsf_req->status;
4590
4591         /* cleanup request */
4592         zfcp_fsf_req_free(fsf_req);
4593  out:
4594         return retval;
4595 }
4596
4597 static inline int
4598 zfcp_fsf_req_sbal_check(unsigned long *flags,
4599                         struct zfcp_qdio_queue *queue, int needed)
4600 {
4601         write_lock_irqsave(&queue->queue_lock, *flags);
4602         if (likely(atomic_read(&queue->free_count) >= needed))
4603                 return 1;
4604         write_unlock_irqrestore(&queue->queue_lock, *flags);
4605         return 0;
4606 }
4607
4608 /*
4609  * set qtcb pointer in fsf_req and initialize QTCB
4610  */
4611 static inline void
4612 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req, u32 fsf_cmd)
4613 {
4614         if (likely(fsf_req->qtcb != NULL)) {
4615                 fsf_req->qtcb->prefix.req_id = (unsigned long)fsf_req;
4616                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4617                 fsf_req->qtcb->prefix.qtcb_type = fsf_qtcb_type[fsf_cmd];
4618                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4619                 fsf_req->qtcb->header.req_handle = (unsigned long)fsf_req;
4620                 fsf_req->qtcb->header.fsf_command = fsf_cmd;
4621         }
4622 }
4623
4624 /**
4625  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4626  * @adapter: adapter for which request queue is examined
4627  * @req_flags: flags indicating whether to wait for needed SBAL or not
4628  * @lock_flags: lock_flags if queue_lock is taken
4629  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4630  * Locks: lock adapter->request_queue->queue_lock on success
4631  */
4632 static int
4633 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4634                       unsigned long *lock_flags)
4635 {
4636         long ret;
4637         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4638
4639         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4640                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4641                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4642                                                        ZFCP_SBAL_TIMEOUT);
4643                 if (ret < 0)
4644                         return ret;
4645                 if (!ret)
4646                         return -EIO;
4647         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4648                 return -EIO;
4649
4650         return 0;
4651 }
4652
4653 /*
4654  * function:    zfcp_fsf_req_create
4655  *
4656  * purpose:     create an FSF request at the specified adapter and
4657  *              setup common fields
4658  *
4659  * returns:     -ENOMEM if there was insufficient memory for a request
4660  *              -EIO if no qdio buffers could be allocate to the request
4661  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4662  *              0 in success
4663  *
4664  * note:        The created request is returned by reference.
4665  *
4666  * locks:       lock of concerned request queue must not be held,
4667  *              but is held on completion (write, irqsave)
4668  */
4669 int
4670 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4671                     mempool_t *pool, unsigned long *lock_flags,
4672                     struct zfcp_fsf_req **fsf_req_p)
4673 {
4674         volatile struct qdio_buffer_element *sbale;
4675         struct zfcp_fsf_req *fsf_req = NULL;
4676         int ret = 0;
4677         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4678
4679         /* allocate new FSF request */
4680         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4681         if (unlikely(NULL == fsf_req)) {
4682                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into"
4683                                "the outbound (send) queue.\n");
4684                 ret = -ENOMEM;
4685                 goto failed_fsf_req;
4686         }
4687
4688         zfcp_fsf_req_qtcb_init(fsf_req, fsf_cmd);
4689
4690         /* initialize waitqueue which may be used to wait on
4691            this request completion */
4692         init_waitqueue_head(&fsf_req->completion_wq);
4693
4694         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4695         if(ret < 0) {
4696                 goto failed_sbals;
4697         }
4698
4699         /*
4700          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4701          * if it is not set (see also *_open_qdio and *_close_qdio).
4702          */
4703
4704         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4705                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4706                 ret = -EIO;
4707                 goto failed_sbals;
4708         }
4709
4710         fsf_req->adapter = adapter;     /* pointer to "parent" adapter */
4711         fsf_req->fsf_command = fsf_cmd;
4712         fsf_req->sbal_number = 1;
4713         fsf_req->sbal_first = req_queue->free_index;
4714         fsf_req->sbal_curr = req_queue->free_index;
4715         fsf_req->sbale_curr = 1;
4716
4717         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4718                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4719         }
4720
4721         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4722
4723         /* setup common SBALE fields */
4724         sbale[0].addr = fsf_req;
4725         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4726         if (likely(fsf_req->qtcb != NULL)) {
4727                 sbale[1].addr = (void *) fsf_req->qtcb;
4728                 sbale[1].length = sizeof(struct fsf_qtcb);
4729         }
4730
4731         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4732                        fsf_req->sbal_number, fsf_req->sbal_first);
4733
4734         goto success;
4735
4736  failed_sbals:
4737 /* dequeue new FSF request previously enqueued */
4738         zfcp_fsf_req_free(fsf_req);
4739         fsf_req = NULL;
4740
4741  failed_fsf_req:
4742         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4743  success:
4744         *fsf_req_p = fsf_req;
4745         return ret;
4746 }
4747
4748 /*
4749  * function:    zfcp_fsf_req_send
4750  *
4751  * purpose:     start transfer of FSF request via QDIO
4752  *
4753  * returns:     0 - request transfer succesfully started
4754  *              !0 - start of request transfer failed
4755  */
4756 static int
4757 zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req, struct timer_list *timer)
4758 {
4759         struct zfcp_adapter *adapter;
4760         struct zfcp_qdio_queue *req_queue;
4761         volatile struct qdio_buffer_element *sbale;
4762         int new_distance_from_int;
4763         unsigned long flags;
4764         int inc_seq_no = 1;
4765         int retval = 0;
4766
4767         adapter = fsf_req->adapter;
4768         req_queue = &adapter->request_queue,
4769
4770
4771         /* FIXME(debug): remove it later */
4772         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4773         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4774         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4775         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4776                       sbale[1].length);
4777
4778         /* set sequence counter in QTCB */
4779         if (likely(fsf_req->qtcb)) {
4780                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4781                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4782                 ZFCP_LOG_TRACE("FSF request %p of adapter %s gets "
4783                                "FSF sequence counter value of %i\n",
4784                                fsf_req,
4785                                zfcp_get_busid_by_adapter(adapter),
4786                                fsf_req->qtcb->prefix.req_seq_no);
4787         } else
4788                 inc_seq_no = 0;
4789
4790         /* put allocated FSF request at list tail */
4791         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4792         list_add_tail(&fsf_req->list, &adapter->fsf_req_list_head);
4793         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4794
4795         /* figure out expiration time of timeout and start timeout */
4796         if (unlikely(timer)) {
4797                 timer->expires += jiffies;
4798                 add_timer(timer);
4799         }
4800
4801         ZFCP_LOG_TRACE("request queue of adapter %s: "
4802                        "next free SBAL is %i, %i free SBALs\n",
4803                        zfcp_get_busid_by_adapter(adapter),
4804                        req_queue->free_index,
4805                        atomic_read(&req_queue->free_count));
4806
4807         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4808                        "index_in_queue=%i, count=%i, buffers=%p\n",
4809                        zfcp_get_busid_by_adapter(adapter),
4810                        QDIO_FLAG_SYNC_OUTPUT,
4811                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4812                        &req_queue->buffer[fsf_req->sbal_first]);
4813
4814         /*
4815          * adjust the number of free SBALs in request queue as well as
4816          * position of first one
4817          */
4818         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4819         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4820         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4821         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4822         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4823
4824         retval = do_QDIO(adapter->ccw_device,
4825                          QDIO_FLAG_SYNC_OUTPUT,
4826                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4827
4828         if (unlikely(retval)) {
4829                 /* Queues are down..... */
4830                 retval = -EIO;
4831                 /*
4832                  * FIXME(potential race):
4833                  * timer might be expired (absolutely unlikely)
4834                  */
4835                 if (timer)
4836                         del_timer(timer);
4837                 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4838                 list_del(&fsf_req->list);
4839                 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4840                 /*
4841                  * adjust the number of free SBALs in request queue as well as
4842                  * position of first one
4843                  */
4844                 zfcp_qdio_zero_sbals(req_queue->buffer,
4845                                      fsf_req->sbal_first, fsf_req->sbal_number);
4846                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4847                 req_queue->free_index -= fsf_req->sbal_number;   /* increase */
4848                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4849                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4850                 ZFCP_LOG_DEBUG
4851                         ("error: do_QDIO failed. Buffers could not be enqueued "
4852                          "to request queue.\n");
4853         } else {
4854                 req_queue->distance_from_int = new_distance_from_int;
4855                 /*
4856                  * increase FSF sequence counter -
4857                  * this must only be done for request successfully enqueued to
4858                  * QDIO this rejected requests may be cleaned up by calling
4859                  * routines  resulting in missing sequence counter values
4860                  * otherwise,
4861                  */
4862                 /* Don't increase for unsolicited status */
4863                 if (likely(inc_seq_no)) {
4864                         adapter->fsf_req_seq_no++;
4865                         ZFCP_LOG_TRACE
4866                             ("FSF sequence counter value of adapter %s "
4867                              "increased to %i\n",
4868                              zfcp_get_busid_by_adapter(adapter),
4869                              adapter->fsf_req_seq_no);
4870                 }
4871                 /* count FSF requests pending */
4872                 atomic_inc(&adapter->fsf_reqs_active);
4873         }
4874         return retval;
4875 }
4876
4877 #undef ZFCP_LOG_AREA