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         zfcp_set_fc_host_attrs(adapter);
2066         return 0;
2067 }
2068
2069 /*
2070  * function:    zfcp_fsf_exchange_config_data_handler
2071  *
2072  * purpose:     is called for finished Exchange Configuration Data command
2073  *
2074  * returns:
2075  */
2076 static int
2077 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2078 {
2079         struct fsf_qtcb_bottom_config *bottom;
2080         struct zfcp_adapter *adapter = fsf_req->adapter;
2081
2082         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2083                 return -EIO;
2084
2085         switch (fsf_req->qtcb->header.fsf_status) {
2086
2087         case FSF_GOOD:
2088                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2089                         return -EIO;
2090
2091                 switch (adapter->fc_topology) {
2092                 case FSF_TOPO_P2P:
2093                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2094                                         "configuration detected at adapter %s\n"
2095                                         "Peer WWNN 0x%016llx, "
2096                                         "peer WWPN 0x%016llx, "
2097                                         "peer d_id 0x%06x\n",
2098                                         zfcp_get_busid_by_adapter(adapter),
2099                                         adapter->peer_wwnn,
2100                                         adapter->peer_wwpn,
2101                                         adapter->peer_d_id);
2102                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2103                                          "top-p-to-p");
2104                         break;
2105                 case FSF_TOPO_AL:
2106                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2107                                         "topology detected at adapter %s "
2108                                         "unsupported, shutting down adapter\n",
2109                                         zfcp_get_busid_by_adapter(adapter));
2110                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2111                                          "top-al");
2112                         zfcp_erp_adapter_shutdown(adapter, 0);
2113                         return -EIO;
2114                 case FSF_TOPO_FABRIC:
2115                         ZFCP_LOG_INFO("Switched fabric fibrechannel "
2116                                       "network detected at adapter %s.\n",
2117                                       zfcp_get_busid_by_adapter(adapter));
2118                         break;
2119                 default:
2120                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2121                                         "reported by the exchange "
2122                                         "configuration command for "
2123                                         "the adapter %s is not "
2124                                         "of a type known to the zfcp "
2125                                         "driver, shutting down adapter\n",
2126                                         zfcp_get_busid_by_adapter(adapter));
2127                         adapter->fc_topology = FSF_TOPO_ERROR;
2128                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2129                                              "unknown-topo");
2130                         zfcp_erp_adapter_shutdown(adapter, 0);
2131                         return -EIO;
2132                 }
2133                 bottom = &fsf_req->qtcb->bottom.config;
2134                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2135                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2136                                         "allowed by the adapter %s "
2137                                         "is lower than the minimum "
2138                                         "required by the driver (%ld bytes).\n",
2139                                         bottom->max_qtcb_size,
2140                                         zfcp_get_busid_by_adapter(adapter),
2141                                         sizeof(struct fsf_qtcb));
2142                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2143                                          "qtcb-size");
2144                         debug_event(fsf_req->adapter->erp_dbf, 0,
2145                                     &bottom->max_qtcb_size, sizeof (u32));
2146                         zfcp_erp_adapter_shutdown(adapter, 0);
2147                         return -EIO;
2148                 }
2149                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2150                                 &adapter->status);
2151                 break;
2152         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2153                 debug_text_event(adapter->erp_dbf, 0, "xchg-inco");
2154
2155                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2156                         return -EIO;
2157
2158                 ZFCP_LOG_INFO("Local link to adapter %s is down\n",
2159                               zfcp_get_busid_by_adapter(adapter));
2160                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
2161                                 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
2162                                 &adapter->status);
2163                 zfcp_erp_adapter_failed(adapter);
2164                 break;
2165         default:
2166                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf-stat-ng");
2167                 debug_event(fsf_req->adapter->erp_dbf, 0,
2168                             &fsf_req->qtcb->header.fsf_status, sizeof (u32));
2169                 zfcp_erp_adapter_shutdown(adapter, 0);
2170                 return -EIO;
2171         }
2172         return 0;
2173 }
2174
2175 /**
2176  * zfcp_fsf_exchange_port_data - request information about local port
2177  * @adapter: for which port data is requested
2178  * @data: response to exchange port data request
2179  */
2180 int
2181 zfcp_fsf_exchange_port_data(struct zfcp_adapter *adapter,
2182                             struct fsf_qtcb_bottom_port *data)
2183 {
2184         volatile struct qdio_buffer_element *sbale;
2185         int retval = 0;
2186         unsigned long lock_flags;
2187         struct zfcp_fsf_req *fsf_req;
2188         struct timer_list *timer;
2189
2190         if(!(adapter->supported_features & FSF_FEATURE_HBAAPI_MANAGEMENT)){
2191                 ZFCP_LOG_INFO("error: exchange port data "
2192                               "command not supported by adapter %s\n",
2193                               zfcp_get_busid_by_adapter(adapter));
2194                 return -EOPNOTSUPP;
2195         }
2196
2197         timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
2198         if (!timer)
2199                 return -ENOMEM;
2200
2201         /* setup new FSF request */
2202         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2203                                      0, 0, &lock_flags, &fsf_req);
2204         if (retval < 0) {
2205                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2206                               "exchange port data request for"
2207                               "the adapter %s.\n",
2208                               zfcp_get_busid_by_adapter(adapter));
2209                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2210                                         lock_flags);
2211                 goto out;
2212         }
2213
2214         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2215         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2216         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2217
2218         fsf_req->data.port_data = data;
2219
2220         init_timer(timer);
2221         timer->function = zfcp_fsf_request_timeout_handler;
2222         timer->data = (unsigned long) adapter;
2223         timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
2224
2225         retval = zfcp_fsf_req_send(fsf_req, timer);
2226         if (retval) {
2227                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2228                               "command on the adapter %s\n",
2229                               zfcp_get_busid_by_adapter(adapter));
2230                 zfcp_fsf_req_free(fsf_req);
2231                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2232                                         lock_flags);
2233                 goto out;
2234         }
2235
2236         ZFCP_LOG_DEBUG("Exchange Port Data request initiated (adapter %s)\n",
2237                        zfcp_get_busid_by_adapter(adapter));
2238
2239         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2240                                 lock_flags);
2241
2242         wait_event(fsf_req->completion_wq,
2243                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2244         del_timer_sync(timer);
2245         zfcp_fsf_req_free(fsf_req);
2246  out:
2247         kfree(timer);
2248         return retval;
2249 }
2250
2251
2252 /**
2253  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2254  * @fsf_req: pointer to struct zfcp_fsf_req
2255  */
2256 static void
2257 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2258 {
2259         struct fsf_qtcb_bottom_port *bottom;
2260         struct fsf_qtcb_bottom_port *data = fsf_req->data.port_data;
2261
2262         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2263                 return;
2264
2265         switch (fsf_req->qtcb->header.fsf_status) {
2266         case FSF_GOOD:
2267                 bottom = &fsf_req->qtcb->bottom.port;
2268                 memcpy(data, bottom, sizeof(*data));
2269                 break;
2270
2271         default:
2272                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "xchg-port-ng");
2273                 debug_event(fsf_req->adapter->erp_dbf, 0,
2274                             &fsf_req->qtcb->header.fsf_status, sizeof(u32));
2275         }
2276 }
2277
2278
2279 /*
2280  * function:    zfcp_fsf_open_port
2281  *
2282  * purpose:
2283  *
2284  * returns:     address of initiated FSF request
2285  *              NULL - request could not be initiated
2286  */
2287 int
2288 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2289 {
2290         volatile struct qdio_buffer_element *sbale;
2291         unsigned long lock_flags;
2292         int retval = 0;
2293
2294         /* setup new FSF request */
2295         retval = zfcp_fsf_req_create(erp_action->adapter,
2296                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2297                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2298                                      erp_action->adapter->pool.fsf_req_erp,
2299                                      &lock_flags, &(erp_action->fsf_req));
2300         if (retval < 0) {
2301                 ZFCP_LOG_INFO("error: Could not create open port request "
2302                               "for port 0x%016Lx on adapter %s.\n",
2303                               erp_action->port->wwpn,
2304                               zfcp_get_busid_by_adapter(erp_action->adapter));
2305                 goto out;
2306         }
2307
2308         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2309                                     erp_action->fsf_req->sbal_curr, 0);
2310         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2311         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2312
2313         erp_action->fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2314         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2315         erp_action->fsf_req->data.open_port.port = erp_action->port;
2316         erp_action->fsf_req->erp_action = erp_action;
2317
2318         /* start QDIO request for this FSF request */
2319         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2320         if (retval) {
2321                 ZFCP_LOG_INFO("error: Could not send open port request for "
2322                               "port 0x%016Lx on adapter %s.\n",
2323                               erp_action->port->wwpn,
2324                               zfcp_get_busid_by_adapter(erp_action->adapter));
2325                 zfcp_fsf_req_free(erp_action->fsf_req);
2326                 erp_action->fsf_req = NULL;
2327                 goto out;
2328         }
2329
2330         ZFCP_LOG_DEBUG("open port request initiated "
2331                        "(adapter %s,  port 0x%016Lx)\n",
2332                        zfcp_get_busid_by_adapter(erp_action->adapter),
2333                        erp_action->port->wwpn);
2334  out:
2335         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2336                                 lock_flags);
2337         return retval;
2338 }
2339
2340 /*
2341  * function:    zfcp_fsf_open_port_handler
2342  *
2343  * purpose:     is called for finished Open Port command
2344  *
2345  * returns:
2346  */
2347 static int
2348 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2349 {
2350         int retval = -EINVAL;
2351         struct zfcp_port *port;
2352         struct fsf_plogi *plogi;
2353         struct fsf_qtcb_header *header;
2354         u16 subtable, rule, counter;
2355
2356         port = fsf_req->data.open_port.port;
2357         header = &fsf_req->qtcb->header;
2358
2359         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2360                 /* don't change port status in our bookkeeping */
2361                 goto skip_fsfstatus;
2362         }
2363
2364         /* evaluate FSF status in QTCB */
2365         switch (header->fsf_status) {
2366
2367         case FSF_PORT_ALREADY_OPEN:
2368                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2369                                 "is already open.\n",
2370                                 port->wwpn, zfcp_get_busid_by_port(port));
2371                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2372                                      "fsf_s_popen");
2373                 /*
2374                  * This is a bug, however operation should continue normally
2375                  * if it is simply ignored
2376                  */
2377                 break;
2378
2379         case FSF_ACCESS_DENIED:
2380                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2381                                 "on adapter %s\n",
2382                                 port->wwpn, zfcp_get_busid_by_port(port));
2383                 for (counter = 0; counter < 2; counter++) {
2384                         subtable = header->fsf_status_qual.halfword[counter * 2];
2385                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2386                         switch (subtable) {
2387                         case FSF_SQ_CFDC_SUBTABLE_OS:
2388                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2389                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2390                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2391                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2392                                         zfcp_act_subtable_type[subtable], rule);
2393                                 break;
2394                         }
2395                 }
2396                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2397                 zfcp_erp_port_access_denied(port);
2398                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2399                 break;
2400
2401         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2402                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2403                               "The remote port 0x%016Lx on adapter %s "
2404                               "could not be opened. Disabling it.\n",
2405                               port->wwpn, zfcp_get_busid_by_port(port));
2406                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2407                                  "fsf_s_max_ports");
2408                 zfcp_erp_port_failed(port);
2409                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2410                 break;
2411
2412         case FSF_ADAPTER_STATUS_AVAILABLE:
2413                 switch (header->fsf_status_qual.word[0]) {
2414                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2415                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2416                                          "fsf_sq_ltest");
2417                         /* ERP strategy will escalate */
2418                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2419                         break;
2420                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2421                         /* ERP strategy will escalate */
2422                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2423                                          "fsf_sq_ulp");
2424                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2425                         break;
2426                 case FSF_SQ_NO_RETRY_POSSIBLE:
2427                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2428                                         "adapter %s could not be opened. "
2429                                         "Disabling it.\n",
2430                                         port->wwpn,
2431                                         zfcp_get_busid_by_port(port));
2432                         debug_text_exception(fsf_req->adapter->erp_dbf, 0,
2433                                              "fsf_sq_no_retry");
2434                         zfcp_erp_port_failed(port);
2435                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2436                         break;
2437                 default:
2438                         ZFCP_LOG_NORMAL
2439                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2440                              header->fsf_status_qual.word[0]);
2441                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2442                                          "fsf_sq_inval:");
2443                         debug_exception(
2444                                 fsf_req->adapter->erp_dbf, 0,
2445                                 &header->fsf_status_qual.word[0],
2446                                 sizeof (u32));
2447                         break;
2448                 }
2449                 break;
2450
2451         case FSF_GOOD:
2452                 /* save port handle assigned by FSF */
2453                 port->handle = header->port_handle;
2454                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2455                               "was opened, it's port handle is 0x%x\n",
2456                               port->wwpn, zfcp_get_busid_by_port(port),
2457                               port->handle);
2458                 /* mark port as open */
2459                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2460                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2461                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2462                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2463                                   &port->status);
2464                 retval = 0;
2465                 /* check whether D_ID has changed during open */
2466                 /*
2467                  * FIXME: This check is not airtight, as the FCP channel does
2468                  * not monitor closures of target port connections caused on
2469                  * the remote side. Thus, they might miss out on invalidating
2470                  * locally cached WWPNs (and other N_Port parameters) of gone
2471                  * target ports. So, our heroic attempt to make things safe
2472                  * could be undermined by 'open port' response data tagged with
2473                  * obsolete WWPNs. Another reason to monitor potential
2474                  * connection closures ourself at least (by interpreting
2475                  * incoming ELS' and unsolicited status). It just crosses my
2476                  * mind that one should be able to cross-check by means of
2477                  * another GID_PN straight after a port has been opened.
2478                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2479                  */
2480                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2481                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2482                 {
2483                         if (fsf_req->qtcb->bottom.support.els1_length <
2484                             ((((unsigned long) &plogi->serv_param.wwpn) -
2485                               ((unsigned long) plogi)) + sizeof (u64))) {
2486                                 ZFCP_LOG_INFO(
2487                                         "warning: insufficient length of "
2488                                         "PLOGI payload (%i)\n",
2489                                         fsf_req->qtcb->bottom.support.els1_length);
2490                                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
2491                                                  "fsf_s_short_plogi:");
2492                                 /* skip sanity check and assume wwpn is ok */
2493                         } else {
2494                                 if (plogi->serv_param.wwpn != port->wwpn) {
2495                                         ZFCP_LOG_INFO("warning: d_id of port "
2496                                                       "0x%016Lx changed during "
2497                                                       "open\n", port->wwpn);
2498                                         debug_text_event(
2499                                                 fsf_req->adapter->erp_dbf, 0,
2500                                                 "fsf_s_did_change:");
2501                                         atomic_clear_mask(
2502                                                 ZFCP_STATUS_PORT_DID_DID,
2503                                                 &port->status);
2504                                 } else
2505                                         port->wwnn = plogi->serv_param.wwnn;
2506                         }
2507                 }
2508                 break;
2509
2510         case FSF_UNKNOWN_OP_SUBTYPE:
2511                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2512                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2513                               "op_subtype=0x%x)\n",
2514                               zfcp_get_busid_by_port(port),
2515                               fsf_req->qtcb->bottom.support.operation_subtype);
2516                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2517                 break;
2518
2519         default:
2520                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2521                                 "(debug info 0x%x)\n",
2522                                 header->fsf_status);
2523                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2524                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2525                                 &header->fsf_status, sizeof (u32));
2526                 break;
2527         }
2528
2529  skip_fsfstatus:
2530         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2531         return retval;
2532 }
2533
2534 /*
2535  * function:    zfcp_fsf_close_port
2536  *
2537  * purpose:     submit FSF command "close port"
2538  *
2539  * returns:     address of initiated FSF request
2540  *              NULL - request could not be initiated
2541  */
2542 int
2543 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2544 {
2545         volatile struct qdio_buffer_element *sbale;
2546         unsigned long lock_flags;
2547         int retval = 0;
2548
2549         /* setup new FSF request */
2550         retval = zfcp_fsf_req_create(erp_action->adapter,
2551                                      FSF_QTCB_CLOSE_PORT,
2552                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2553                                      erp_action->adapter->pool.fsf_req_erp,
2554                                      &lock_flags, &(erp_action->fsf_req));
2555         if (retval < 0) {
2556                 ZFCP_LOG_INFO("error: Could not create a close port request "
2557                               "for port 0x%016Lx on adapter %s.\n",
2558                               erp_action->port->wwpn,
2559                               zfcp_get_busid_by_adapter(erp_action->adapter));
2560                 goto out;
2561         }
2562
2563         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2564                                     erp_action->fsf_req->sbal_curr, 0);
2565         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2566         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2567
2568         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2569         erp_action->fsf_req->data.close_port.port = erp_action->port;
2570         erp_action->fsf_req->erp_action = erp_action;
2571         erp_action->fsf_req->qtcb->header.port_handle =
2572             erp_action->port->handle;
2573
2574         /* start QDIO request for this FSF request */
2575         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2576         if (retval) {
2577                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2578                               "port 0x%016Lx on adapter %s.\n",
2579                               erp_action->port->wwpn,
2580                               zfcp_get_busid_by_adapter(erp_action->adapter));
2581                 zfcp_fsf_req_free(erp_action->fsf_req);
2582                 erp_action->fsf_req = NULL;
2583                 goto out;
2584         }
2585
2586         ZFCP_LOG_TRACE("close port request initiated "
2587                        "(adapter %s, port 0x%016Lx)\n",
2588                        zfcp_get_busid_by_adapter(erp_action->adapter),
2589                        erp_action->port->wwpn);
2590  out:
2591         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2592                                 lock_flags);
2593         return retval;
2594 }
2595
2596 /*
2597  * function:    zfcp_fsf_close_port_handler
2598  *
2599  * purpose:     is called for finished Close Port FSF command
2600  *
2601  * returns:
2602  */
2603 static int
2604 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2605 {
2606         int retval = -EINVAL;
2607         struct zfcp_port *port;
2608
2609         port = fsf_req->data.close_port.port;
2610
2611         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2612                 /* don't change port status in our bookkeeping */
2613                 goto skip_fsfstatus;
2614         }
2615
2616         /* evaluate FSF status in QTCB */
2617         switch (fsf_req->qtcb->header.fsf_status) {
2618
2619         case FSF_PORT_HANDLE_NOT_VALID:
2620                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2621                               "0x%016Lx on adapter %s invalid. This may happen "
2622                               "occasionally.\n", port->handle,
2623                               port->wwpn, zfcp_get_busid_by_port(port));
2624                 ZFCP_LOG_DEBUG("status qualifier:\n");
2625                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2626                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2627                               sizeof (union fsf_status_qual));
2628                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2629                                  "fsf_s_phand_nv");
2630                 zfcp_erp_adapter_reopen(port->adapter, 0);
2631                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2632                 break;
2633
2634         case FSF_ADAPTER_STATUS_AVAILABLE:
2635                 /* Note: FSF has actually closed the port in this case.
2636                  * The status code is just daft. Fingers crossed for a change
2637                  */
2638                 retval = 0;
2639                 break;
2640
2641         case FSF_GOOD:
2642                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2643                                "port handle 0x%x\n", port->wwpn,
2644                                zfcp_get_busid_by_port(port), port->handle);
2645                 zfcp_erp_modify_port_status(port,
2646                                             ZFCP_STATUS_COMMON_OPEN,
2647                                             ZFCP_CLEAR);
2648                 retval = 0;
2649                 break;
2650
2651         default:
2652                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2653                                 "(debug info 0x%x)\n",
2654                                 fsf_req->qtcb->header.fsf_status);
2655                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2656                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2657                                 &fsf_req->qtcb->header.fsf_status,
2658                                 sizeof (u32));
2659                 break;
2660         }
2661
2662  skip_fsfstatus:
2663         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2664         return retval;
2665 }
2666
2667 /*
2668  * function:    zfcp_fsf_close_physical_port
2669  *
2670  * purpose:     submit FSF command "close physical port"
2671  *
2672  * returns:     address of initiated FSF request
2673  *              NULL - request could not be initiated
2674  */
2675 int
2676 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2677 {
2678         int retval = 0;
2679         unsigned long lock_flags;
2680         volatile struct qdio_buffer_element *sbale;
2681
2682         /* setup new FSF request */
2683         retval = zfcp_fsf_req_create(erp_action->adapter,
2684                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2685                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2686                                      erp_action->adapter->pool.fsf_req_erp,
2687                                      &lock_flags, &erp_action->fsf_req);
2688         if (retval < 0) {
2689                 ZFCP_LOG_INFO("error: Could not create close physical port "
2690                               "request (adapter %s, port 0x%016Lx)\n",
2691                               zfcp_get_busid_by_adapter(erp_action->adapter),
2692                               erp_action->port->wwpn);
2693
2694                 goto out;
2695         }
2696
2697         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2698                                     erp_action->fsf_req->sbal_curr, 0);
2699         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2700         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2701
2702         /* mark port as being closed */
2703         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2704                         &erp_action->port->status);
2705         /* save a pointer to this port */
2706         erp_action->fsf_req->data.close_physical_port.port = erp_action->port;
2707         /* port to be closeed */
2708         erp_action->fsf_req->qtcb->header.port_handle =
2709             erp_action->port->handle;
2710         erp_action->fsf_req->erp_action = erp_action;
2711
2712         /* start QDIO request for this FSF request */
2713         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2714         if (retval) {
2715                 ZFCP_LOG_INFO("error: Could not send close physical port "
2716                               "request (adapter %s, port 0x%016Lx)\n",
2717                               zfcp_get_busid_by_adapter(erp_action->adapter),
2718                               erp_action->port->wwpn);
2719                 zfcp_fsf_req_free(erp_action->fsf_req);
2720                 erp_action->fsf_req = NULL;
2721                 goto out;
2722         }
2723
2724         ZFCP_LOG_TRACE("close physical port request initiated "
2725                        "(adapter %s, port 0x%016Lx)\n",
2726                        zfcp_get_busid_by_adapter(erp_action->adapter),
2727                        erp_action->port->wwpn);
2728  out:
2729         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2730                                 lock_flags);
2731         return retval;
2732 }
2733
2734 /*
2735  * function:    zfcp_fsf_close_physical_port_handler
2736  *
2737  * purpose:     is called for finished Close Physical Port FSF command
2738  *
2739  * returns:
2740  */
2741 static int
2742 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2743 {
2744         int retval = -EINVAL;
2745         struct zfcp_port *port;
2746         struct zfcp_unit *unit;
2747         struct fsf_qtcb_header *header;
2748         u16 subtable, rule, counter;
2749
2750         port = fsf_req->data.close_physical_port.port;
2751         header = &fsf_req->qtcb->header;
2752
2753         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2754                 /* don't change port status in our bookkeeping */
2755                 goto skip_fsfstatus;
2756         }
2757
2758         /* evaluate FSF status in QTCB */
2759         switch (header->fsf_status) {
2760
2761         case FSF_PORT_HANDLE_NOT_VALID:
2762                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2763                               "(adapter %s, port 0x%016Lx). "
2764                               "This may happen occasionally.\n",
2765                               port->handle,
2766                               zfcp_get_busid_by_port(port),
2767                               port->wwpn);
2768                 ZFCP_LOG_DEBUG("status qualifier:\n");
2769                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2770                               (char *) &header->fsf_status_qual,
2771                               sizeof (union fsf_status_qual));
2772                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
2773                                  "fsf_s_phand_nv");
2774                 zfcp_erp_adapter_reopen(port->adapter, 0);
2775                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2776                 break;
2777
2778         case FSF_ACCESS_DENIED:
2779                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2780                                 "physical port 0x%016Lx on adapter %s\n",
2781                                 port->wwpn, zfcp_get_busid_by_port(port));
2782                 for (counter = 0; counter < 2; counter++) {
2783                         subtable = header->fsf_status_qual.halfword[counter * 2];
2784                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2785                         switch (subtable) {
2786                         case FSF_SQ_CFDC_SUBTABLE_OS:
2787                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2788                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2789                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2790                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2791                                         zfcp_act_subtable_type[subtable], rule);
2792                                 break;
2793                         }
2794                 }
2795                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
2796                 zfcp_erp_port_access_denied(port);
2797                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2798                 break;
2799
2800         case FSF_PORT_BOXED:
2801                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2802                                "%s needs to be reopened but it was attempted "
2803                                "to close it physically.\n",
2804                                port->wwpn,
2805                                zfcp_get_busid_by_port(port));
2806                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_pboxed");
2807                 zfcp_erp_port_boxed(port);
2808                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2809                         ZFCP_STATUS_FSFREQ_RETRY;
2810                 break;
2811
2812         case FSF_ADAPTER_STATUS_AVAILABLE:
2813                 switch (header->fsf_status_qual.word[0]) {
2814                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2815                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2816                                          "fsf_sq_ltest");
2817                         /* This will now be escalated by ERP */
2818                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2819                         break;
2820                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2821                         /* ERP strategy will escalate */
2822                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
2823                                          "fsf_sq_ulp");
2824                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2825                         break;
2826                 default:
2827                         ZFCP_LOG_NORMAL
2828                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2829                              header->fsf_status_qual.word[0]);
2830                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
2831                                          "fsf_sq_inval:");
2832                         debug_exception(
2833                                 fsf_req->adapter->erp_dbf, 0,
2834                                 &header->fsf_status_qual.word[0], sizeof (u32));
2835                         break;
2836                 }
2837                 break;
2838
2839         case FSF_GOOD:
2840                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2841                                "physically closed, port handle 0x%x\n",
2842                                port->wwpn,
2843                                zfcp_get_busid_by_port(port), port->handle);
2844                 /* can't use generic zfcp_erp_modify_port_status because
2845                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2846                  */
2847                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2848                 list_for_each_entry(unit, &port->unit_list_head, list)
2849                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2850                 retval = 0;
2851                 break;
2852
2853         default:
2854                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2855                                 "(debug info 0x%x)\n",
2856                                 header->fsf_status);
2857                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
2858                 debug_exception(fsf_req->adapter->erp_dbf, 0,
2859                                 &header->fsf_status, sizeof (u32));
2860                 break;
2861         }
2862
2863  skip_fsfstatus:
2864         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2865         return retval;
2866 }
2867
2868 /*
2869  * function:    zfcp_fsf_open_unit
2870  *
2871  * purpose:
2872  *
2873  * returns:
2874  *
2875  * assumptions: This routine does not check whether the associated
2876  *              remote port has already been opened. This should be
2877  *              done by calling routines. Otherwise some status
2878  *              may be presented by FSF
2879  */
2880 int
2881 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2882 {
2883         volatile struct qdio_buffer_element *sbale;
2884         unsigned long lock_flags;
2885         int retval = 0;
2886
2887         /* setup new FSF request */
2888         retval = zfcp_fsf_req_create(erp_action->adapter,
2889                                      FSF_QTCB_OPEN_LUN,
2890                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2891                                      erp_action->adapter->pool.fsf_req_erp,
2892                                      &lock_flags, &(erp_action->fsf_req));
2893         if (retval < 0) {
2894                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2895                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2896                               erp_action->unit->fcp_lun,
2897                               erp_action->unit->port->wwpn,
2898                               zfcp_get_busid_by_adapter(erp_action->adapter));
2899                 goto out;
2900         }
2901
2902         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
2903                                     erp_action->fsf_req->sbal_curr, 0);
2904         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2905         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2906
2907         erp_action->fsf_req->qtcb->header.port_handle =
2908                 erp_action->port->handle;
2909         erp_action->fsf_req->qtcb->bottom.support.fcp_lun =
2910                 erp_action->unit->fcp_lun;
2911         erp_action->fsf_req->qtcb->bottom.support.option =
2912                 FSF_OPEN_LUN_SUPPRESS_BOXING;
2913         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2914         erp_action->fsf_req->data.open_unit.unit = erp_action->unit;
2915         erp_action->fsf_req->erp_action = erp_action;
2916
2917         /* start QDIO request for this FSF request */
2918         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
2919         if (retval) {
2920                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2921                               "on the adapter %s, port 0x%016Lx for "
2922                               "unit 0x%016Lx\n",
2923                               zfcp_get_busid_by_adapter(erp_action->adapter),
2924                               erp_action->port->wwpn,
2925                               erp_action->unit->fcp_lun);
2926                 zfcp_fsf_req_free(erp_action->fsf_req);
2927                 erp_action->fsf_req = NULL;
2928                 goto out;
2929         }
2930
2931         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2932                        "port 0x%016Lx, unit 0x%016Lx)\n",
2933                        zfcp_get_busid_by_adapter(erp_action->adapter),
2934                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2935  out:
2936         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2937                                 lock_flags);
2938         return retval;
2939 }
2940
2941 /*
2942  * function:    zfcp_fsf_open_unit_handler
2943  *
2944  * purpose:     is called for finished Open LUN command
2945  *
2946  * returns:
2947  */
2948 static int
2949 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2950 {
2951         int retval = -EINVAL;
2952         struct zfcp_adapter *adapter;
2953         struct zfcp_unit *unit;
2954         struct fsf_qtcb_header *header;
2955         struct fsf_qtcb_bottom_support *bottom;
2956         struct fsf_queue_designator *queue_designator;
2957         u16 subtable, rule, counter;
2958         u32 allowed, exclusive, readwrite;
2959
2960         unit = fsf_req->data.open_unit.unit;
2961
2962         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2963                 /* don't change unit status in our bookkeeping */
2964                 goto skip_fsfstatus;
2965         }
2966
2967         adapter = fsf_req->adapter;
2968         header = &fsf_req->qtcb->header;
2969         bottom = &fsf_req->qtcb->bottom.support;
2970         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
2971
2972         allowed   = bottom->lun_access_info & FSF_UNIT_ACCESS_OPEN_LUN_ALLOWED;
2973         exclusive = bottom->lun_access_info & FSF_UNIT_ACCESS_EXCLUSIVE;
2974         readwrite = bottom->lun_access_info & FSF_UNIT_ACCESS_OUTBOUND_TRANSFER;
2975
2976         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2977                           ZFCP_STATUS_UNIT_SHARED |
2978                           ZFCP_STATUS_UNIT_READONLY,
2979                           &unit->status);
2980
2981         /* evaluate FSF status in QTCB */
2982         switch (header->fsf_status) {
2983
2984         case FSF_PORT_HANDLE_NOT_VALID:
2985                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
2986                               "for port 0x%016Lx on adapter %s invalid "
2987                               "This may happen occasionally\n",
2988                               unit->port->handle,
2989                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
2990                 ZFCP_LOG_DEBUG("status qualifier:\n");
2991                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2992                               (char *) &header->fsf_status_qual,
2993                               sizeof (union fsf_status_qual));
2994                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_ph_nv");
2995                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
2996                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2997                 break;
2998
2999         case FSF_LUN_ALREADY_OPEN:
3000                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3001                                 "remote port 0x%016Lx on adapter %s twice.\n",
3002                                 unit->fcp_lun,
3003                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3004                 debug_text_exception(adapter->erp_dbf, 0,
3005                                      "fsf_s_uopen");
3006                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3007                 break;
3008
3009         case FSF_ACCESS_DENIED:
3010                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3011                                 "remote port 0x%016Lx on adapter %s\n",
3012                                 unit->fcp_lun, unit->port->wwpn,
3013                                 zfcp_get_busid_by_unit(unit));
3014                 for (counter = 0; counter < 2; counter++) {
3015                         subtable = header->fsf_status_qual.halfword[counter * 2];
3016                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3017                         switch (subtable) {
3018                         case FSF_SQ_CFDC_SUBTABLE_OS:
3019                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3020                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3021                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3022                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3023                                         zfcp_act_subtable_type[subtable], rule);
3024                                 break;
3025                         }
3026                 }
3027                 debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
3028                 zfcp_erp_unit_access_denied(unit);
3029                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3030                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3031                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3032                 break;
3033
3034         case FSF_PORT_BOXED:
3035                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3036                                "needs to be reopened\n",
3037                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3038                 debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
3039                 zfcp_erp_port_boxed(unit->port);
3040                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3041                         ZFCP_STATUS_FSFREQ_RETRY;
3042                 break;
3043
3044         case FSF_LUN_SHARING_VIOLATION:
3045                 if (header->fsf_status_qual.word[0] != 0) {
3046                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3047                                         "with WWPN 0x%Lx "
3048                                         "connected to the adapter %s "
3049                                         "is already in use in LPAR%d, CSS%d\n",
3050                                         unit->fcp_lun,
3051                                         unit->port->wwpn,
3052                                         zfcp_get_busid_by_unit(unit),
3053                                         queue_designator->hla,
3054                                         queue_designator->cssid);
3055                 } else {
3056                         subtable = header->fsf_status_qual.halfword[4];
3057                         rule = header->fsf_status_qual.halfword[5];
3058                         switch (subtable) {
3059                         case FSF_SQ_CFDC_SUBTABLE_OS:
3060                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3061                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3062                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3063                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3064                                                 "remote port with WWPN 0x%Lx "
3065                                                 "connected to the adapter %s "
3066                                                 "is denied (%s rule %d)\n",
3067                                                 unit->fcp_lun,
3068                                                 unit->port->wwpn,
3069                                                 zfcp_get_busid_by_unit(unit),
3070                                                 zfcp_act_subtable_type[subtable],
3071                                                 rule);
3072                                 break;
3073                         }
3074                 }
3075                 ZFCP_LOG_DEBUG("status qualifier:\n");
3076                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3077                               (char *) &header->fsf_status_qual,
3078                               sizeof (union fsf_status_qual));
3079                 debug_text_event(adapter->erp_dbf, 2,
3080                                  "fsf_s_l_sh_vio");
3081                 zfcp_erp_unit_access_denied(unit);
3082                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3083                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3084                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3085                 break;
3086
3087         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3088                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3089                               "There is no handle (temporary port identifier) "
3090                               "available for unit 0x%016Lx on port 0x%016Lx "
3091                               "on adapter %s\n",
3092                               unit->fcp_lun,
3093                               unit->port->wwpn,
3094                               zfcp_get_busid_by_unit(unit));
3095                 debug_text_event(adapter->erp_dbf, 1,
3096                                  "fsf_s_max_units");
3097                 zfcp_erp_unit_failed(unit);
3098                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3099                 break;
3100
3101         case FSF_ADAPTER_STATUS_AVAILABLE:
3102                 switch (header->fsf_status_qual.word[0]) {
3103                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3104                         /* Re-establish link to port */
3105                         debug_text_event(adapter->erp_dbf, 1,
3106                                          "fsf_sq_ltest");
3107                         zfcp_test_link(unit->port);
3108                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3109                         break;
3110                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3111                         /* ERP strategy will escalate */
3112                         debug_text_event(adapter->erp_dbf, 1,
3113                                          "fsf_sq_ulp");
3114                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3115                         break;
3116                 default:
3117                         ZFCP_LOG_NORMAL
3118                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3119                              header->fsf_status_qual.word[0]);
3120                         debug_text_event(adapter->erp_dbf, 0,
3121                                          "fsf_sq_inval:");
3122                         debug_exception(adapter->erp_dbf, 0,
3123                                         &header->fsf_status_qual.word[0],
3124                                 sizeof (u32));
3125                 }
3126                 break;
3127
3128         case FSF_INVALID_COMMAND_OPTION:
3129                 ZFCP_LOG_NORMAL(
3130                         "Invalid option 0x%x has been specified "
3131                         "in QTCB bottom sent to the adapter %s\n",
3132                         bottom->option,
3133                         zfcp_get_busid_by_adapter(adapter));
3134                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3135                 retval = -EINVAL;
3136                 break;
3137
3138         case FSF_GOOD:
3139                 /* save LUN handle assigned by FSF */
3140                 unit->handle = header->lun_handle;
3141                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3142                                "adapter %s opened, port handle 0x%x\n",
3143                                unit->fcp_lun,
3144                                unit->port->wwpn,
3145                                zfcp_get_busid_by_unit(unit),
3146                                unit->handle);
3147                 /* mark unit as open */
3148                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3149                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
3150                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
3151                                   &unit->status);
3152                 if (adapter->supported_features & FSF_FEATURE_LUN_SHARING){
3153                         if (!exclusive)
3154                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3155                                                 &unit->status);
3156
3157                         if (!readwrite) {
3158                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3159                                                 &unit->status);
3160                                 ZFCP_LOG_NORMAL("read-only access for unit "
3161                                                 "(adapter %s, wwpn=0x%016Lx, "
3162                                                 "fcp_lun=0x%016Lx)\n",
3163                                                 zfcp_get_busid_by_unit(unit),
3164                                                 unit->port->wwpn,
3165                                                 unit->fcp_lun);
3166                         }
3167
3168                         if (exclusive && !readwrite) {
3169                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3170                                                 "unit not supported\n");
3171                                 zfcp_erp_unit_failed(unit);
3172                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3173                                 zfcp_erp_unit_shutdown(unit, 0);
3174                         } else if (!exclusive && readwrite) {
3175                                 ZFCP_LOG_NORMAL("shared access of read-write "
3176                                                 "unit not supported\n");
3177                                 zfcp_erp_unit_failed(unit);
3178                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3179                                 zfcp_erp_unit_shutdown(unit, 0);
3180                         }
3181                 }
3182
3183                 retval = 0;
3184                 break;
3185
3186         default:
3187                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3188                                 "(debug info 0x%x)\n",
3189                                 header->fsf_status);
3190                 debug_text_event(adapter->erp_dbf, 0, "fsf_s_inval:");
3191                 debug_exception(adapter->erp_dbf, 0,
3192                                 &header->fsf_status, sizeof (u32));
3193                 break;
3194         }
3195
3196  skip_fsfstatus:
3197         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3198         return retval;
3199 }
3200
3201 /*
3202  * function:    zfcp_fsf_close_unit
3203  *
3204  * purpose:
3205  *
3206  * returns:     address of fsf_req - request successfully initiated
3207  *              NULL -
3208  *
3209  * assumptions: This routine does not check whether the associated
3210  *              remote port/lun has already been opened. This should be
3211  *              done by calling routines. Otherwise some status
3212  *              may be presented by FSF
3213  */
3214 int
3215 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3216 {
3217         volatile struct qdio_buffer_element *sbale;
3218         unsigned long lock_flags;
3219         int retval = 0;
3220
3221         /* setup new FSF request */
3222         retval = zfcp_fsf_req_create(erp_action->adapter,
3223                                      FSF_QTCB_CLOSE_LUN,
3224                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3225                                      erp_action->adapter->pool.fsf_req_erp,
3226                                      &lock_flags, &(erp_action->fsf_req));
3227         if (retval < 0) {
3228                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3229                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3230                               erp_action->unit->fcp_lun,
3231                               erp_action->port->wwpn,
3232                               zfcp_get_busid_by_adapter(erp_action->adapter));
3233                 goto out;
3234         }
3235
3236         sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
3237                                     erp_action->fsf_req->sbal_curr, 0);
3238         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3239         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3240
3241         erp_action->fsf_req->qtcb->header.port_handle =
3242             erp_action->port->handle;
3243         erp_action->fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3244         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3245         erp_action->fsf_req->data.close_unit.unit = erp_action->unit;
3246         erp_action->fsf_req->erp_action = erp_action;
3247
3248         /* start QDIO request for this FSF request */
3249         retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
3250         if (retval) {
3251                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3252                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3253                               erp_action->unit->fcp_lun,
3254                               erp_action->port->wwpn,
3255                               zfcp_get_busid_by_adapter(erp_action->adapter));
3256                 zfcp_fsf_req_free(erp_action->fsf_req);
3257                 erp_action->fsf_req = NULL;
3258                 goto out;
3259         }
3260
3261         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3262                        "port 0x%016Lx, unit 0x%016Lx)\n",
3263                        zfcp_get_busid_by_adapter(erp_action->adapter),
3264                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3265  out:
3266         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3267                                 lock_flags);
3268         return retval;
3269 }
3270
3271 /*
3272  * function:    zfcp_fsf_close_unit_handler
3273  *
3274  * purpose:     is called for finished Close LUN FSF command
3275  *
3276  * returns:
3277  */
3278 static int
3279 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3280 {
3281         int retval = -EINVAL;
3282         struct zfcp_unit *unit;
3283
3284         unit = fsf_req->data.close_unit.unit;   /* restore unit */
3285
3286         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3287                 /* don't change unit status in our bookkeeping */
3288                 goto skip_fsfstatus;
3289         }
3290
3291         /* evaluate FSF status in QTCB */
3292         switch (fsf_req->qtcb->header.fsf_status) {
3293
3294         case FSF_PORT_HANDLE_NOT_VALID:
3295                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3296                               "0x%016Lx on adapter %s invalid. This may "
3297                               "happen in rare circumstances\n",
3298                               unit->port->handle,
3299                               unit->port->wwpn,
3300                               zfcp_get_busid_by_unit(unit));
3301                 ZFCP_LOG_DEBUG("status qualifier:\n");
3302                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3303                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3304                               sizeof (union fsf_status_qual));
3305                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3306                                  "fsf_s_phand_nv");
3307                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3308                 zfcp_cmd_dbf_event_fsf("porthinv", fsf_req,
3309                                        &fsf_req->qtcb->header.fsf_status_qual,
3310                                        sizeof (union fsf_status_qual));
3311                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3312                 break;
3313
3314         case FSF_LUN_HANDLE_NOT_VALID:
3315                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3316                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3317                               "invalid. This may happen occasionally.\n",
3318                               unit->handle,
3319                               unit->fcp_lun,
3320                               unit->port->wwpn,
3321                               zfcp_get_busid_by_unit(unit));
3322                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3323                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3324                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3325                               sizeof (union fsf_status_qual));
3326                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3327                                  "fsf_s_lhand_nv");
3328                 zfcp_erp_port_reopen(unit->port, 0);
3329                 zfcp_cmd_dbf_event_fsf("lunhinv", fsf_req,
3330                                        &fsf_req->qtcb->header.fsf_status_qual,
3331                                        sizeof (union fsf_status_qual));
3332                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3333                 break;
3334
3335         case FSF_PORT_BOXED:
3336                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3337                                "needs to be reopened\n",
3338                                unit->port->wwpn,
3339                                zfcp_get_busid_by_unit(unit));
3340                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3341                 zfcp_erp_port_boxed(unit->port);
3342                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3343                         ZFCP_STATUS_FSFREQ_RETRY;
3344                 break;
3345
3346         case FSF_ADAPTER_STATUS_AVAILABLE:
3347                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3348                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3349                         /* re-establish link to port */
3350                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3351                                          "fsf_sq_ltest");
3352                         zfcp_test_link(unit->port);
3353                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3354                         break;
3355                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3356                         /* ERP strategy will escalate */
3357                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3358                                          "fsf_sq_ulp");
3359                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3360                         break;
3361                 default:
3362                         ZFCP_LOG_NORMAL
3363                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3364                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3365                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3366                                          "fsf_sq_inval:");
3367                         debug_exception(
3368                                 fsf_req->adapter->erp_dbf, 0,
3369                                 &fsf_req->qtcb->header.fsf_status_qual.word[0],
3370                                 sizeof (u32));
3371                         break;
3372                 }
3373                 break;
3374
3375         case FSF_GOOD:
3376                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3377                                "closed, port handle 0x%x\n",
3378                                unit->fcp_lun,
3379                                unit->port->wwpn,
3380                                zfcp_get_busid_by_unit(unit),
3381                                unit->handle);
3382                 /* mark unit as closed */
3383                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3384                 retval = 0;
3385                 break;
3386
3387         default:
3388                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3389                                 "(debug info 0x%x)\n",
3390                                 fsf_req->qtcb->header.fsf_status);
3391                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3392                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3393                                 &fsf_req->qtcb->header.fsf_status,
3394                                 sizeof (u32));
3395                 break;
3396         }
3397
3398  skip_fsfstatus:
3399         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3400         return retval;
3401 }
3402
3403 /**
3404  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3405  * @adapter: adapter where scsi command is issued
3406  * @unit: unit where command is sent to
3407  * @scsi_cmnd: scsi command to be sent
3408  * @timer: timer to be started when request is initiated
3409  * @req_flags: flags for fsf_request
3410  */
3411 int
3412 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3413                                struct zfcp_unit *unit,
3414                                struct scsi_cmnd * scsi_cmnd,
3415                                struct timer_list *timer, int req_flags)
3416 {
3417         struct zfcp_fsf_req *fsf_req = NULL;
3418         struct fcp_cmnd_iu *fcp_cmnd_iu;
3419         unsigned int sbtype;
3420         unsigned long lock_flags;
3421         int real_bytes = 0;
3422         int retval = 0;
3423         int mask;
3424
3425         /* setup new FSF request */
3426         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3427                                      adapter->pool.fsf_req_scsi,
3428                                      &lock_flags, &fsf_req);
3429         if (unlikely(retval < 0)) {
3430                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3431                                "for unit 0x%016Lx on port 0x%016Lx on "
3432                                "adapter %s\n",
3433                                unit->fcp_lun,
3434                                unit->port->wwpn,
3435                                zfcp_get_busid_by_adapter(adapter));
3436                 goto failed_req_create;
3437         }
3438
3439         /*
3440          * associate FSF request with SCSI request
3441          * (need this for look up on abort)
3442          */
3443         fsf_req->data.send_fcp_command_task.fsf_req = fsf_req;
3444         scsi_cmnd->host_scribble = (char *) &(fsf_req->data);
3445
3446         /*
3447          * associate SCSI command with FSF request
3448          * (need this for look up on normal command completion)
3449          */
3450         fsf_req->data.send_fcp_command_task.scsi_cmnd = scsi_cmnd;
3451         fsf_req->data.send_fcp_command_task.start_jiffies = jiffies;
3452         fsf_req->data.send_fcp_command_task.unit = unit;
3453         ZFCP_LOG_DEBUG("unit=%p, fcp_lun=0x%016Lx\n", unit, unit->fcp_lun);
3454
3455         /* set handles of unit and its parent port in QTCB */
3456         fsf_req->qtcb->header.lun_handle = unit->handle;
3457         fsf_req->qtcb->header.port_handle = unit->port->handle;
3458
3459         /* FSF does not define the structure of the FCP_CMND IU */
3460         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3461             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3462
3463         /*
3464          * set depending on data direction:
3465          *      data direction bits in SBALE (SB Type)
3466          *      data direction bits in QTCB
3467          *      data direction bits in FCP_CMND IU
3468          */
3469         switch (scsi_cmnd->sc_data_direction) {
3470         case DMA_NONE:
3471                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3472                 /*
3473                  * FIXME(qdio):
3474                  * what is the correct type for commands
3475                  * without 'real' data buffers?
3476                  */
3477                 sbtype = SBAL_FLAGS0_TYPE_READ;
3478                 break;
3479         case DMA_FROM_DEVICE:
3480                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3481                 sbtype = SBAL_FLAGS0_TYPE_READ;
3482                 fcp_cmnd_iu->rddata = 1;
3483                 break;
3484         case DMA_TO_DEVICE:
3485                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3486                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3487                 fcp_cmnd_iu->wddata = 1;
3488                 break;
3489         case DMA_BIDIRECTIONAL:
3490         default:
3491                 /*
3492                  * dummy, catch this condition earlier
3493                  * in zfcp_scsi_queuecommand
3494                  */
3495                 goto failed_scsi_cmnd;
3496         }
3497
3498         /* set FC service class in QTCB (3 per default) */
3499         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3500
3501         /* set FCP_LUN in FCP_CMND IU in QTCB */
3502         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3503
3504         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3505
3506         /* set task attributes in FCP_CMND IU in QTCB */
3507         if (likely((scsi_cmnd->device->simple_tags) ||
3508                    (atomic_test_mask(mask, &unit->status))))
3509                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3510         else
3511                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3512
3513         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3514         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3515                 fcp_cmnd_iu->add_fcp_cdb_length
3516                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3517                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3518                                "additional FCP_CDB length is 0x%x "
3519                                "(shifted right 2 bits)\n",
3520                                scsi_cmnd->cmd_len,
3521                                fcp_cmnd_iu->add_fcp_cdb_length);
3522         }
3523         /*
3524          * copy SCSI CDB (including additional length, if any) to
3525          * FCP_CDB in FCP_CMND IU in QTCB
3526          */
3527         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3528
3529         /* FCP CMND IU length in QTCB */
3530         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3531                 sizeof (struct fcp_cmnd_iu) +
3532                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3533
3534         /* generate SBALEs from data buffer */
3535         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3536         if (unlikely(real_bytes < 0)) {
3537                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3538                         ZFCP_LOG_DEBUG(
3539                                 "Data did not fit into available buffer(s), "
3540                                "waiting for more...\n");
3541                 retval = -EIO;
3542         } else {
3543                 ZFCP_LOG_NORMAL("error: No truncation implemented but "
3544                                 "required. Shutting down unit "
3545                                 "(adapter %s, port 0x%016Lx, "
3546                                 "unit 0x%016Lx)\n",
3547                                 zfcp_get_busid_by_unit(unit),
3548                                 unit->port->wwpn,
3549                                 unit->fcp_lun);
3550                 zfcp_erp_unit_shutdown(unit, 0);
3551                 retval = -EINVAL;
3552                 }
3553                 goto no_fit;
3554         }
3555
3556         /* set length of FCP data length in FCP_CMND IU in QTCB */
3557         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3558
3559         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3560         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3561                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3562
3563         /*
3564          * start QDIO request for this FSF request
3565          *  covered by an SBALE)
3566          */
3567         retval = zfcp_fsf_req_send(fsf_req, timer);
3568         if (unlikely(retval < 0)) {
3569                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3570                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3571                               zfcp_get_busid_by_adapter(adapter),
3572                               unit->port->wwpn,
3573                               unit->fcp_lun);
3574                 goto send_failed;
3575         }
3576
3577         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3578                        "port 0x%016Lx, unit 0x%016Lx)\n",
3579                        zfcp_get_busid_by_adapter(adapter),
3580                        unit->port->wwpn,
3581                        unit->fcp_lun);
3582         goto success;
3583
3584  send_failed:
3585  no_fit:
3586  failed_scsi_cmnd:
3587         zfcp_fsf_req_free(fsf_req);
3588         fsf_req = NULL;
3589         scsi_cmnd->host_scribble = NULL;
3590  success:
3591  failed_req_create:
3592         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3593         return retval;
3594 }
3595
3596 /*
3597  * function:    zfcp_fsf_send_fcp_command_task_management
3598  *
3599  * purpose:
3600  *
3601  * returns:
3602  *
3603  * FIXME(design): should be watched by a timeout!!!
3604  * FIXME(design) shouldn't this be modified to return an int
3605  *               also...don't know how though
3606  *
3607  */
3608 struct zfcp_fsf_req *
3609 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3610                                           struct zfcp_unit *unit,
3611                                           u8 tm_flags, int req_flags)
3612 {
3613         struct zfcp_fsf_req *fsf_req = NULL;
3614         int retval = 0;
3615         struct fcp_cmnd_iu *fcp_cmnd_iu;
3616         unsigned long lock_flags;
3617         volatile struct qdio_buffer_element *sbale;
3618
3619         /* setup new FSF request */
3620         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3621                                      adapter->pool.fsf_req_scsi,
3622                                      &lock_flags, &fsf_req);
3623         if (retval < 0) {
3624                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3625                               "management) request for adapter %s, port "
3626                               " 0x%016Lx, unit 0x%016Lx.\n",
3627                               zfcp_get_busid_by_adapter(adapter),
3628                               unit->port->wwpn, unit->fcp_lun);
3629                 goto out;
3630         }
3631
3632         /*
3633          * Used to decide on proper handler in the return path,
3634          * could be either zfcp_fsf_send_fcp_command_task_handler or
3635          * zfcp_fsf_send_fcp_command_task_management_handler */
3636
3637         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3638
3639         /*
3640          * hold a pointer to the unit being target of this
3641          * task management request
3642          */
3643         fsf_req->data.send_fcp_command_task_management.unit = unit;
3644
3645         /* set FSF related fields in QTCB */
3646         fsf_req->qtcb->header.lun_handle = unit->handle;
3647         fsf_req->qtcb->header.port_handle = unit->port->handle;
3648         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3649         fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
3650         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3651                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3652
3653         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3654         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3655         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3656
3657         /* set FCP related fields in FCP_CMND IU in QTCB */
3658         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3659                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3660         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3661         fcp_cmnd_iu->task_management_flags = tm_flags;
3662
3663         /* start QDIO request for this FSF request */
3664         zfcp_fsf_start_scsi_er_timer(adapter);
3665         retval = zfcp_fsf_req_send(fsf_req, NULL);
3666         if (retval) {
3667                 del_timer(&adapter->scsi_er_timer);
3668                 ZFCP_LOG_INFO("error: Could not send an FCP-command (task "
3669                               "management) on adapter %s, port 0x%016Lx for "
3670                               "unit LUN 0x%016Lx\n",
3671                               zfcp_get_busid_by_adapter(adapter),
3672                               unit->port->wwpn,
3673                               unit->fcp_lun);
3674                 zfcp_fsf_req_free(fsf_req);
3675                 fsf_req = NULL;
3676                 goto out;
3677         }
3678
3679         ZFCP_LOG_TRACE("Send FCP Command (task management function) initiated "
3680                        "(adapter %s, port 0x%016Lx, unit 0x%016Lx, "
3681                        "tm_flags=0x%x)\n",
3682                        zfcp_get_busid_by_adapter(adapter),
3683                        unit->port->wwpn,
3684                        unit->fcp_lun,
3685                        tm_flags);
3686  out:
3687         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3688         return fsf_req;
3689 }
3690
3691 /*
3692  * function:    zfcp_fsf_send_fcp_command_handler
3693  *
3694  * purpose:     is called for finished Send FCP Command
3695  *
3696  * returns:
3697  */
3698 static int
3699 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3700 {
3701         int retval = -EINVAL;
3702         struct zfcp_unit *unit;
3703         struct fsf_qtcb_header *header;
3704         u16 subtable, rule, counter;
3705
3706         header = &fsf_req->qtcb->header;
3707
3708         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3709                 unit = fsf_req->data.send_fcp_command_task_management.unit;
3710         else
3711                 unit = fsf_req->data.send_fcp_command_task.unit;
3712
3713         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3714                 /* go directly to calls of special handlers */
3715                 goto skip_fsfstatus;
3716         }
3717
3718         /* evaluate FSF status in QTCB */
3719         switch (header->fsf_status) {
3720
3721         case FSF_PORT_HANDLE_NOT_VALID:
3722                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3723                               "0x%016Lx on adapter %s invalid\n",
3724                               unit->port->handle,
3725                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3726                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3727                               (char *) &header->fsf_status_qual,
3728                               sizeof (union fsf_status_qual));
3729                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3730                                  "fsf_s_phand_nv");
3731                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3732                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3733                 break;
3734
3735         case FSF_LUN_HANDLE_NOT_VALID:
3736                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3737                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3738                               "invalid. This may happen occasionally.\n",
3739                               unit->handle,
3740                               unit->fcp_lun,
3741                               unit->port->wwpn,
3742                               zfcp_get_busid_by_unit(unit));
3743                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3744                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3745                               (char *) &header->fsf_status_qual,
3746                               sizeof (union fsf_status_qual));
3747                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3748                                  "fsf_s_uhand_nv");
3749                 zfcp_erp_port_reopen(unit->port, 0);
3750                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3751                 break;
3752
3753         case FSF_HANDLE_MISMATCH:
3754                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3755                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3756                                 "unit 0x%016Lx)\n",
3757                                 unit->port->handle,
3758                                 zfcp_get_busid_by_unit(unit),
3759                                 unit->port->wwpn,
3760                                 unit->fcp_lun);
3761                 ZFCP_LOG_NORMAL("status qualifier:\n");
3762                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3763                               (char *) &header->fsf_status_qual,
3764                               sizeof (union fsf_status_qual));
3765                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3766                                  "fsf_s_hand_mis");
3767                 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
3768                 zfcp_cmd_dbf_event_fsf("handmism",
3769                                        fsf_req,
3770                                        &header->fsf_status_qual,
3771                                        sizeof (union fsf_status_qual));
3772                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3773                 break;
3774
3775         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3776                 if (fsf_req->adapter->fc_service_class <= 3) {
3777                         ZFCP_LOG_NORMAL("error: The adapter %s does "
3778                                         "not support fibrechannel class %d.\n",
3779                                         zfcp_get_busid_by_unit(unit),
3780                                         fsf_req->adapter->fc_service_class);
3781                 } else {
3782                         ZFCP_LOG_NORMAL("bug: The fibrechannel class at "
3783                                         "adapter %s is invalid. "
3784                                         "(debug info %d)\n",
3785                                         zfcp_get_busid_by_unit(unit),
3786                                         fsf_req->adapter->fc_service_class);
3787                 }
3788                 /* stop operation for this adapter */
3789                 debug_text_exception(fsf_req->adapter->erp_dbf, 0,
3790                                      "fsf_s_class_nsup");
3791                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3792                 zfcp_cmd_dbf_event_fsf("unsclass",
3793                                        fsf_req,
3794                                        &header->fsf_status_qual,
3795                                        sizeof (union fsf_status_qual));
3796                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3797                 break;
3798
3799         case FSF_FCPLUN_NOT_VALID:
3800                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3801                                 "adapter %s does not have correct unit "
3802                                 "handle 0x%x\n",
3803                                 unit->fcp_lun,
3804                                 unit->port->wwpn,
3805                                 zfcp_get_busid_by_unit(unit),
3806                                 unit->handle);
3807                 ZFCP_LOG_DEBUG("status qualifier:\n");
3808                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3809                               (char *) &header->fsf_status_qual,
3810                               sizeof (union fsf_status_qual));
3811                 debug_text_event(fsf_req->adapter->erp_dbf, 1,
3812                                  "fsf_s_fcp_lun_nv");
3813                 zfcp_erp_port_reopen(unit->port, 0);
3814                 zfcp_cmd_dbf_event_fsf("fluninv",
3815                                        fsf_req,
3816                                        &header->fsf_status_qual,
3817                                        sizeof (union fsf_status_qual));
3818                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3819                 break;
3820
3821         case FSF_ACCESS_DENIED:
3822                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3823                                 "unit 0x%016Lx on port 0x%016Lx on "
3824                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3825                                 zfcp_get_busid_by_unit(unit));
3826                 for (counter = 0; counter < 2; counter++) {
3827                         subtable = header->fsf_status_qual.halfword[counter * 2];
3828                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3829                         switch (subtable) {
3830                         case FSF_SQ_CFDC_SUBTABLE_OS:
3831                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3832                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3833                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3834                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3835                                         zfcp_act_subtable_type[subtable], rule);
3836                                 break;
3837                         }
3838                 }
3839                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
3840                 zfcp_erp_unit_access_denied(unit);
3841                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3842                 break;
3843
3844         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3845                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3846                               "0x%016Lx on port 0x%016Lx on adapter %s "
3847                               "(debug info %d)\n",
3848                               unit->fcp_lun,
3849                               unit->port->wwpn,
3850                               zfcp_get_busid_by_unit(unit),
3851                               fsf_req->qtcb->bottom.io.data_direction);
3852                 /* stop operation for this adapter */
3853                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3854                                  "fsf_s_dir_ind_nv");
3855                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3856                 zfcp_cmd_dbf_event_fsf("dirinv",
3857                                        fsf_req,
3858                                        &header->fsf_status_qual,
3859                                        sizeof (union fsf_status_qual));
3860                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3861                 break;
3862
3863         case FSF_CMND_LENGTH_NOT_VALID:
3864                 ZFCP_LOG_NORMAL
3865                     ("bug: An invalid control-data-block length field "
3866                      "was found in a command for unit 0x%016Lx on port "
3867                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3868                      unit->fcp_lun, unit->port->wwpn,
3869                      zfcp_get_busid_by_unit(unit),
3870                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3871                 /* stop operation for this adapter */
3872                 debug_text_event(fsf_req->adapter->erp_dbf, 0,
3873                                  "fsf_s_cmd_len_nv");
3874                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
3875                 zfcp_cmd_dbf_event_fsf("cleninv",
3876                                        fsf_req,
3877                                        &header->fsf_status_qual,
3878                                        sizeof (union fsf_status_qual));
3879                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3880                 break;
3881
3882         case FSF_PORT_BOXED:
3883                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3884                                "needs to be reopened\n",
3885                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3886                 debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
3887                 zfcp_erp_port_boxed(unit->port);
3888                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3889                         ZFCP_STATUS_FSFREQ_RETRY;
3890                 break;
3891
3892         case FSF_LUN_BOXED:
3893                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3894                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3895                                 zfcp_get_busid_by_unit(unit),
3896                                 unit->port->wwpn, unit->fcp_lun);
3897                 debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
3898                 zfcp_erp_unit_boxed(unit);
3899                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3900                         | ZFCP_STATUS_FSFREQ_RETRY;
3901                 break;
3902
3903         case FSF_ADAPTER_STATUS_AVAILABLE:
3904                 switch (header->fsf_status_qual.word[0]) {
3905                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3906                         /* re-establish link to port */
3907                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3908                                          "fsf_sq_ltest");
3909                         zfcp_test_link(unit->port);
3910                         break;
3911                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3912                         /* FIXME(hw) need proper specs for proper action */
3913                         /* let scsi stack deal with retries and escalation */
3914                         debug_text_event(fsf_req->adapter->erp_dbf, 1,
3915                                          "fsf_sq_ulp");
3916                         break;
3917                 default:
3918                         ZFCP_LOG_NORMAL
3919                             ("Unknown status qualifier 0x%x arrived.\n",
3920                              header->fsf_status_qual.word[0]);
3921                         debug_text_event(fsf_req->adapter->erp_dbf, 0,
3922                                          "fsf_sq_inval:");
3923                         debug_exception(fsf_req->adapter->erp_dbf, 0,
3924                                         &header->fsf_status_qual.word[0],
3925                                         sizeof(u32));
3926                         break;
3927                 }
3928                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3929                 break;
3930
3931         case FSF_GOOD:
3932                 break;
3933
3934         case FSF_FCP_RSP_AVAILABLE:
3935                 break;
3936
3937         default:
3938                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
3939                 debug_exception(fsf_req->adapter->erp_dbf, 0,
3940                                 &header->fsf_status, sizeof(u32));
3941                 break;
3942         }
3943
3944  skip_fsfstatus:
3945         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3946                 retval =
3947                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3948         } else {
3949                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3950         }
3951         return retval;
3952 }
3953
3954 /*
3955  * function:    zfcp_fsf_send_fcp_command_task_handler
3956  *
3957  * purpose:     evaluates FCP_RSP IU
3958  *
3959  * returns:
3960  */
3961 static int
3962 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3963 {
3964         int retval = 0;
3965         struct scsi_cmnd *scpnt;
3966         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3967             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3968         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3969             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3970         u32 sns_len;
3971         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3972         unsigned long flags;
3973         struct zfcp_unit *unit = fsf_req->data.send_fcp_command_task.unit;
3974
3975         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3976         scpnt = fsf_req->data.send_fcp_command_task.scsi_cmnd;
3977         if (unlikely(!scpnt)) {
3978                 ZFCP_LOG_DEBUG
3979                     ("Command with fsf_req %p is not associated to "
3980                      "a scsi command anymore. Aborted?\n", fsf_req);
3981                 goto out;
3982         }
3983         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3984                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3985                  *        DID_SOFT_ERROR by retrying the request for devices
3986                  *        that allow retries.
3987                  */
3988                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3989                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3990                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3991                 goto skip_fsfstatus;
3992         }
3993
3994         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3995                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3996                 set_host_byte(&scpnt->result, DID_ERROR);
3997                 goto skip_fsfstatus;
3998         }
3999
4000         /* set message byte of result in SCSI command */
4001         scpnt->result |= COMMAND_COMPLETE << 8;
4002
4003         /*
4004          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
4005          * of result in SCSI command
4006          */
4007         scpnt->result |= fcp_rsp_iu->scsi_status;
4008         if (unlikely(fcp_rsp_iu->scsi_status)) {
4009                 /* DEBUG */
4010                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
4011                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4012                               scpnt->cmnd, scpnt->cmd_len);
4013                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
4014                                 fcp_rsp_iu->scsi_status);
4015                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4016                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
4017                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4018                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
4019                               fcp_rsp_iu->fcp_sns_len);
4020         }
4021
4022         /* check FCP_RSP_INFO */
4023         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
4024                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
4025                 switch (fcp_rsp_info[3]) {
4026                 case RSP_CODE_GOOD:
4027                         /* ok, continue */
4028                         ZFCP_LOG_TRACE("no failure or Task Management "
4029                                        "Function complete\n");
4030                         set_host_byte(&scpnt->result, DID_OK);
4031                         break;
4032                 case RSP_CODE_LENGTH_MISMATCH:
4033                         /* hardware bug */
4034                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4035                                         "that the fibrechannel protocol data "
4036                                         "length differs from the burst length. "
4037                                         "The problem occured on unit 0x%016Lx "
4038                                         "on port 0x%016Lx on adapter %s",
4039                                         unit->fcp_lun,
4040                                         unit->port->wwpn,
4041                                         zfcp_get_busid_by_unit(unit));
4042                         /* dump SCSI CDB as prepared by zfcp */
4043                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4044                                       (char *) &fsf_req->qtcb->
4045                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4046                         zfcp_cmd_dbf_event_fsf("clenmis", fsf_req, NULL, 0);
4047                         set_host_byte(&scpnt->result, DID_ERROR);
4048                         goto skip_fsfstatus;
4049                 case RSP_CODE_FIELD_INVALID:
4050                         /* driver or hardware bug */
4051                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
4052                                         "that the fibrechannel protocol data "
4053                                         "fields were incorrectly set up. "
4054                                         "The problem occured on the unit "
4055                                         "0x%016Lx on port 0x%016Lx on "
4056                                         "adapter %s",
4057                                         unit->fcp_lun,
4058                                         unit->port->wwpn,
4059                                         zfcp_get_busid_by_unit(unit));
4060                         /* dump SCSI CDB as prepared by zfcp */
4061                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4062                                       (char *) &fsf_req->qtcb->
4063                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4064                         set_host_byte(&scpnt->result, DID_ERROR);
4065                         zfcp_cmd_dbf_event_fsf("codeinv", fsf_req, NULL, 0);
4066                         goto skip_fsfstatus;
4067                 case RSP_CODE_RO_MISMATCH:
4068                         /* hardware bug */
4069                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
4070                                         "that conflicting  values for the "
4071                                         "fibrechannel payload offset from the "
4072                                         "header were found. "
4073                                         "The problem occured on unit 0x%016Lx "
4074                                         "on port 0x%016Lx on adapter %s.\n",
4075                                         unit->fcp_lun,
4076                                         unit->port->wwpn,
4077                                         zfcp_get_busid_by_unit(unit));
4078                         /* dump SCSI CDB as prepared by zfcp */
4079                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4080                                       (char *) &fsf_req->qtcb->
4081                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4082                         zfcp_cmd_dbf_event_fsf("codemism", fsf_req, NULL, 0);
4083                         set_host_byte(&scpnt->result, DID_ERROR);
4084                         goto skip_fsfstatus;
4085                 default:
4086                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4087                                         "code was detected for a command. "
4088                                         "The problem occured on the unit "
4089                                         "0x%016Lx on port 0x%016Lx on "
4090                                         "adapter %s (debug info 0x%x)\n",
4091                                         unit->fcp_lun,
4092                                         unit->port->wwpn,
4093                                         zfcp_get_busid_by_unit(unit),
4094                                         fcp_rsp_info[3]);
4095                         /* dump SCSI CDB as prepared by zfcp */
4096                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4097                                       (char *) &fsf_req->qtcb->
4098                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4099                         zfcp_cmd_dbf_event_fsf("undeffcp", fsf_req, NULL, 0);
4100                         set_host_byte(&scpnt->result, DID_ERROR);
4101                         goto skip_fsfstatus;
4102                 }
4103         }
4104
4105         /* check for sense data */
4106         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4107                 sns_len = FSF_FCP_RSP_SIZE -
4108                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4109                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4110                                sns_len);
4111                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4112                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4113                                SCSI_SENSE_BUFFERSIZE);
4114                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4115                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4116                                scpnt->result);
4117                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4118                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4119
4120                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4121                                fcp_rsp_iu->fcp_sns_len);
4122                 memcpy(&scpnt->sense_buffer,
4123                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4124                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4125                               (void *) &scpnt->sense_buffer, sns_len);
4126         }
4127
4128         /* check for overrun */
4129         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4130                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4131                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4132                               "The response data length is "
4133                               "%d, the original length was %d.\n",
4134                               unit->fcp_lun,
4135                               unit->port->wwpn,
4136                               zfcp_get_busid_by_unit(unit),
4137                               fcp_rsp_iu->fcp_resid,
4138                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4139         }
4140
4141         /* check for underrun */
4142         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4143                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4144                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4145                               "The response data length is "
4146                               "%d, the original length was %d.\n",
4147                               unit->fcp_lun,
4148                               unit->port->wwpn,
4149                               zfcp_get_busid_by_unit(unit),
4150                               fcp_rsp_iu->fcp_resid,
4151                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4152
4153                 scpnt->resid = fcp_rsp_iu->fcp_resid;
4154                 if (scpnt->request_bufflen - scpnt->resid < scpnt->underflow)
4155                         set_host_byte(&scpnt->result, DID_ERROR);
4156         }
4157
4158  skip_fsfstatus:
4159         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4160
4161         zfcp_cmd_dbf_event_scsi("response", scpnt);
4162
4163         /* cleanup pointer (need this especially for abort) */
4164         scpnt->host_scribble = NULL;
4165
4166         /*
4167          * NOTE:
4168          * according to the outcome of a discussion on linux-scsi we
4169          * don't need to grab the io_request_lock here since we use
4170          * the new eh
4171          */
4172         /* always call back */
4173
4174         (scpnt->scsi_done) (scpnt);
4175
4176         /*
4177          * We must hold this lock until scsi_done has been called.
4178          * Otherwise we may call scsi_done after abort regarding this
4179          * command has completed.
4180          * Note: scsi_done must not block!
4181          */
4182  out:
4183         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4184         return retval;
4185 }
4186
4187 /*
4188  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4189  *
4190  * purpose:     evaluates FCP_RSP IU
4191  *
4192  * returns:
4193  */
4194 static int
4195 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4196 {
4197         int retval = 0;
4198         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4199             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4200         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4201         struct zfcp_unit *unit =
4202             fsf_req->data.send_fcp_command_task_management.unit;
4203
4204         del_timer(&fsf_req->adapter->scsi_er_timer);
4205         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4206                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4207                 goto skip_fsfstatus;
4208         }
4209
4210         /* check FCP_RSP_INFO */
4211         switch (fcp_rsp_info[3]) {
4212         case RSP_CODE_GOOD:
4213                 /* ok, continue */
4214                 ZFCP_LOG_DEBUG("no failure or Task Management "
4215                                "Function complete\n");
4216                 break;
4217         case RSP_CODE_TASKMAN_UNSUPP:
4218                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4219                                 "is not supported on the target device "
4220                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4221                                 unit->fcp_lun,
4222                                 unit->port->wwpn,
4223                                 zfcp_get_busid_by_unit(unit));
4224                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4225                 break;
4226         case RSP_CODE_TASKMAN_FAILED:
4227                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4228                                 "failed to complete successfully. "
4229                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4230                                 unit->fcp_lun,
4231                                 unit->port->wwpn,
4232                                 zfcp_get_busid_by_unit(unit));
4233                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4234                 break;
4235         default:
4236                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4237                                 "code was detected for a command. "
4238                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4239                                 "(debug info 0x%x)\n",
4240                                 unit->fcp_lun,
4241                                 unit->port->wwpn,
4242                                 zfcp_get_busid_by_unit(unit),
4243                                 fcp_rsp_info[3]);
4244                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4245         }
4246
4247       skip_fsfstatus:
4248         return retval;
4249 }
4250
4251
4252 /*
4253  * function:    zfcp_fsf_control_file
4254  *
4255  * purpose:     Initiator of the control file upload/download FSF requests
4256  *
4257  * returns:     0           - FSF request is successfuly created and queued
4258  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4259  *              -EINVAL     - Invalid direction specified
4260  *              -ENOMEM     - Insufficient memory
4261  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4262  */
4263 int
4264 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4265                       struct zfcp_fsf_req **fsf_req_ptr,
4266                       u32 fsf_command,
4267                       u32 option,
4268                       struct zfcp_sg_list *sg_list)
4269 {
4270         struct zfcp_fsf_req *fsf_req;
4271         struct fsf_qtcb_bottom_support *bottom;
4272         volatile struct qdio_buffer_element *sbale;
4273         struct timer_list *timer;
4274         unsigned long lock_flags;
4275         int req_flags = 0;
4276         int direction;
4277         int retval = 0;
4278
4279         if (!(adapter->supported_features & FSF_FEATURE_CFDC)) {
4280                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4281                               zfcp_get_busid_by_adapter(adapter));
4282                 retval = -EOPNOTSUPP;
4283                 goto out;
4284         }
4285
4286         switch (fsf_command) {
4287
4288         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4289                 direction = SBAL_FLAGS0_TYPE_WRITE;
4290                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4291                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4292                         req_flags = ZFCP_WAIT_FOR_SBAL;
4293                 break;
4294
4295         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4296                 direction = SBAL_FLAGS0_TYPE_READ;
4297                 break;
4298
4299         default:
4300                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4301                 retval = -EINVAL;
4302                 goto out;
4303         }
4304
4305         timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
4306         if (!timer) {
4307                 retval = -ENOMEM;
4308                 goto out;
4309         }
4310
4311         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4312                                      NULL, &lock_flags, &fsf_req);
4313         if (retval < 0) {
4314                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4315                               "adapter %s\n",
4316                         zfcp_get_busid_by_adapter(adapter));
4317                 retval = -EPERM;
4318                 goto unlock_queue_lock;
4319         }
4320
4321         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4322         sbale[0].flags |= direction;
4323
4324         bottom = &fsf_req->qtcb->bottom.support;
4325         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4326         bottom->option = option;
4327
4328         if (sg_list->count > 0) {
4329                 int bytes;
4330
4331                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4332                                                 sg_list->sg, sg_list->count,
4333                                                 ZFCP_MAX_SBALS_PER_REQ);
4334                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4335                         ZFCP_LOG_INFO(
4336                                 "error: Could not create sufficient number of "
4337                                 "SBALS for an FSF request to the adapter %s\n",
4338                                 zfcp_get_busid_by_adapter(adapter));
4339                         retval = -ENOMEM;
4340                         goto free_fsf_req;
4341                 }
4342         } else
4343                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4344
4345         init_timer(timer);
4346         timer->function = zfcp_fsf_request_timeout_handler;
4347         timer->data = (unsigned long) adapter;
4348         timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
4349
4350         retval = zfcp_fsf_req_send(fsf_req, timer);
4351         if (retval < 0) {
4352                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4353                               "(adapter %s)\n",
4354                               zfcp_get_busid_by_adapter(adapter));
4355                 retval = -EPERM;
4356                 goto free_fsf_req;
4357         }
4358         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4359
4360         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4361                         "adapter %s\n",
4362                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4363                         "download" : "upload",
4364                         zfcp_get_busid_by_adapter(adapter));
4365
4366         wait_event(fsf_req->completion_wq,
4367                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4368
4369         *fsf_req_ptr = fsf_req;
4370         del_timer_sync(timer);
4371         goto free_timer;
4372
4373  free_fsf_req:
4374         zfcp_fsf_req_free(fsf_req);
4375  unlock_queue_lock:
4376         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4377  free_timer:
4378         kfree(timer);
4379  out:
4380         return retval;
4381 }
4382
4383
4384 /*
4385  * function:    zfcp_fsf_control_file_handler
4386  *
4387  * purpose:     Handler of the control file upload/download FSF requests
4388  *
4389  * returns:     0       - FSF request successfuly processed
4390  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4391  *              -EACCES - There is no permission to execute an operation
4392  *              -EPERM  - The control file is not in a right format
4393  *              -EIO    - There is a problem with the FCP adapter
4394  *              -EINVAL - Invalid operation
4395  *              -EFAULT - User space memory I/O operation fault
4396  */
4397 static int
4398 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4399 {
4400         struct zfcp_adapter *adapter = fsf_req->adapter;
4401         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4402         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4403         int retval = 0;
4404
4405         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4406                 retval = -EINVAL;
4407                 goto skip_fsfstatus;
4408         }
4409
4410         switch (header->fsf_status) {
4411
4412         case FSF_GOOD:
4413                 ZFCP_LOG_NORMAL(
4414                         "The FSF request has been successfully completed "
4415                         "on the adapter %s\n",
4416                         zfcp_get_busid_by_adapter(adapter));
4417                 break;
4418
4419         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4420                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4421                         switch (header->fsf_status_qual.word[0]) {
4422
4423                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4424                                 ZFCP_LOG_NORMAL(
4425                                         "CFDC on the adapter %s has being "
4426                                         "hardened on primary and secondary SE\n",
4427                                         zfcp_get_busid_by_adapter(adapter));
4428                                 break;
4429
4430                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4431                                 ZFCP_LOG_NORMAL(
4432                                         "CFDC of the adapter %s could not "
4433                                         "be saved on the SE\n",
4434                                         zfcp_get_busid_by_adapter(adapter));
4435                                 break;
4436
4437                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4438                                 ZFCP_LOG_NORMAL(
4439                                         "CFDC of the adapter %s could not "
4440                                         "be copied to the secondary SE\n",
4441                                         zfcp_get_busid_by_adapter(adapter));
4442                                 break;
4443
4444                         default:
4445                                 ZFCP_LOG_NORMAL(
4446                                         "CFDC could not be hardened "
4447                                         "on the adapter %s\n",
4448                                         zfcp_get_busid_by_adapter(adapter));
4449                         }
4450                 }
4451                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4452                 retval = -EAGAIN;
4453                 break;
4454
4455         case FSF_AUTHORIZATION_FAILURE:
4456                 ZFCP_LOG_NORMAL(
4457                         "Adapter %s does not accept privileged commands\n",
4458                         zfcp_get_busid_by_adapter(adapter));
4459                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4460                 retval = -EACCES;
4461                 break;
4462
4463         case FSF_CFDC_ERROR_DETECTED:
4464                 ZFCP_LOG_NORMAL(
4465                         "Error at position %d in the CFDC, "
4466                         "CFDC is discarded by the adapter %s\n",
4467                         header->fsf_status_qual.word[0],
4468                         zfcp_get_busid_by_adapter(adapter));
4469                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4470                 retval = -EPERM;
4471                 break;
4472
4473         case FSF_CONTROL_FILE_UPDATE_ERROR:
4474                 ZFCP_LOG_NORMAL(
4475                         "Adapter %s cannot harden the control file, "
4476                         "file is discarded\n",
4477                         zfcp_get_busid_by_adapter(adapter));
4478                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4479                 retval = -EIO;
4480                 break;
4481
4482         case FSF_CONTROL_FILE_TOO_LARGE:
4483                 ZFCP_LOG_NORMAL(
4484                         "Control file is too large, file is discarded "
4485                         "by the adapter %s\n",
4486                         zfcp_get_busid_by_adapter(adapter));
4487                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4488                 retval = -EIO;
4489                 break;
4490
4491         case FSF_ACCESS_CONFLICT_DETECTED:
4492                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4493                         ZFCP_LOG_NORMAL(
4494                                 "CFDC has been discarded by the adapter %s, "
4495                                 "because activation would impact "
4496                                 "%d active connection(s)\n",
4497                                 zfcp_get_busid_by_adapter(adapter),
4498                                 header->fsf_status_qual.word[0]);
4499                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4500                 retval = -EIO;
4501                 break;
4502
4503         case FSF_CONFLICTS_OVERRULED:
4504                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4505                         ZFCP_LOG_NORMAL(
4506                                 "CFDC has been activated on the adapter %s, "
4507                                 "but activation has impacted "
4508                                 "%d active connection(s)\n",
4509                                 zfcp_get_busid_by_adapter(adapter),
4510                                 header->fsf_status_qual.word[0]);
4511                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4512                 retval = -EIO;
4513                 break;
4514
4515         case FSF_UNKNOWN_OP_SUBTYPE:
4516                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4517                                 "op_subtype=0x%x)\n",
4518                                 zfcp_get_busid_by_adapter(adapter),
4519                                 bottom->operation_subtype);
4520                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4521                 retval = -EINVAL;
4522                 break;
4523
4524         case FSF_INVALID_COMMAND_OPTION:
4525                 ZFCP_LOG_NORMAL(
4526                         "Invalid option 0x%x has been specified "
4527                         "in QTCB bottom sent to the adapter %s\n",
4528                         bottom->option,
4529                         zfcp_get_busid_by_adapter(adapter));
4530                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4531                 retval = -EINVAL;
4532                 break;
4533
4534         default:
4535                 ZFCP_LOG_NORMAL(
4536                         "bug: An unknown/unexpected FSF status 0x%08x "
4537                         "was presented on the adapter %s\n",
4538                         header->fsf_status,
4539                         zfcp_get_busid_by_adapter(adapter));
4540                 debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_sq_inval");
4541                 debug_exception(fsf_req->adapter->erp_dbf, 0,
4542                         &header->fsf_status_qual.word[0], sizeof(u32));
4543                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4544                 retval = -EINVAL;
4545                 break;
4546         }
4547
4548 skip_fsfstatus:
4549         return retval;
4550 }
4551
4552
4553 /*
4554  * function:    zfcp_fsf_req_wait_and_cleanup
4555  *
4556  * purpose:
4557  *
4558  * FIXME(design): signal seems to be <0 !!!
4559  * returns:     0       - request completed (*status is valid), cleanup succ.
4560  *              <0      - request completed (*status is valid), cleanup failed
4561  *              >0      - signal which interrupted waiting (*status invalid),
4562  *                        request not completed, no cleanup
4563  *
4564  *              *status is a copy of status of completed fsf_req
4565  */
4566 int
4567 zfcp_fsf_req_wait_and_cleanup(struct zfcp_fsf_req *fsf_req,
4568                               int interruptible, u32 * status)
4569 {
4570         int retval = 0;
4571         int signal = 0;
4572
4573         if (interruptible) {
4574                 __wait_event_interruptible(fsf_req->completion_wq,
4575                                            fsf_req->status &
4576                                            ZFCP_STATUS_FSFREQ_COMPLETED,
4577                                            signal);
4578                 if (signal) {
4579                         ZFCP_LOG_DEBUG("Caught signal %i while waiting for the "
4580                                        "completion of the request at %p\n",
4581                                        signal, fsf_req);
4582                         retval = signal;
4583                         goto out;
4584                 }
4585         } else {
4586                 __wait_event(fsf_req->completion_wq,
4587                              fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4588         }
4589
4590         *status = fsf_req->status;
4591
4592         /* cleanup request */
4593         zfcp_fsf_req_free(fsf_req);
4594  out:
4595         return retval;
4596 }
4597
4598 static inline int
4599 zfcp_fsf_req_sbal_check(unsigned long *flags,
4600                         struct zfcp_qdio_queue *queue, int needed)
4601 {
4602         write_lock_irqsave(&queue->queue_lock, *flags);
4603         if (likely(atomic_read(&queue->free_count) >= needed))
4604                 return 1;
4605         write_unlock_irqrestore(&queue->queue_lock, *flags);
4606         return 0;
4607 }
4608
4609 /*
4610  * set qtcb pointer in fsf_req and initialize QTCB
4611  */
4612 static inline void
4613 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req, u32 fsf_cmd)
4614 {
4615         if (likely(fsf_req->qtcb != NULL)) {
4616                 fsf_req->qtcb->prefix.req_id = (unsigned long)fsf_req;
4617                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4618                 fsf_req->qtcb->prefix.qtcb_type = fsf_qtcb_type[fsf_cmd];
4619                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4620                 fsf_req->qtcb->header.req_handle = (unsigned long)fsf_req;
4621                 fsf_req->qtcb->header.fsf_command = fsf_cmd;
4622         }
4623 }
4624
4625 /**
4626  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4627  * @adapter: adapter for which request queue is examined
4628  * @req_flags: flags indicating whether to wait for needed SBAL or not
4629  * @lock_flags: lock_flags if queue_lock is taken
4630  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4631  * Locks: lock adapter->request_queue->queue_lock on success
4632  */
4633 static int
4634 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4635                       unsigned long *lock_flags)
4636 {
4637         long ret;
4638         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4639
4640         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4641                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4642                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4643                                                        ZFCP_SBAL_TIMEOUT);
4644                 if (ret < 0)
4645                         return ret;
4646                 if (!ret)
4647                         return -EIO;
4648         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4649                 return -EIO;
4650
4651         return 0;
4652 }
4653
4654 /*
4655  * function:    zfcp_fsf_req_create
4656  *
4657  * purpose:     create an FSF request at the specified adapter and
4658  *              setup common fields
4659  *
4660  * returns:     -ENOMEM if there was insufficient memory for a request
4661  *              -EIO if no qdio buffers could be allocate to the request
4662  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4663  *              0 in success
4664  *
4665  * note:        The created request is returned by reference.
4666  *
4667  * locks:       lock of concerned request queue must not be held,
4668  *              but is held on completion (write, irqsave)
4669  */
4670 int
4671 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4672                     mempool_t *pool, unsigned long *lock_flags,
4673                     struct zfcp_fsf_req **fsf_req_p)
4674 {
4675         volatile struct qdio_buffer_element *sbale;
4676         struct zfcp_fsf_req *fsf_req = NULL;
4677         int ret = 0;
4678         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4679
4680         /* allocate new FSF request */
4681         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4682         if (unlikely(NULL == fsf_req)) {
4683                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into"
4684                                "the outbound (send) queue.\n");
4685                 ret = -ENOMEM;
4686                 goto failed_fsf_req;
4687         }
4688
4689         zfcp_fsf_req_qtcb_init(fsf_req, fsf_cmd);
4690
4691         /* initialize waitqueue which may be used to wait on
4692            this request completion */
4693         init_waitqueue_head(&fsf_req->completion_wq);
4694
4695         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4696         if(ret < 0) {
4697                 goto failed_sbals;
4698         }
4699
4700         /*
4701          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4702          * if it is not set (see also *_open_qdio and *_close_qdio).
4703          */
4704
4705         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4706                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4707                 ret = -EIO;
4708                 goto failed_sbals;
4709         }
4710
4711         fsf_req->adapter = adapter;     /* pointer to "parent" adapter */
4712         fsf_req->fsf_command = fsf_cmd;
4713         fsf_req->sbal_number = 1;
4714         fsf_req->sbal_first = req_queue->free_index;
4715         fsf_req->sbal_curr = req_queue->free_index;
4716         fsf_req->sbale_curr = 1;
4717
4718         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4719                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4720         }
4721
4722         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4723
4724         /* setup common SBALE fields */
4725         sbale[0].addr = fsf_req;
4726         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4727         if (likely(fsf_req->qtcb != NULL)) {
4728                 sbale[1].addr = (void *) fsf_req->qtcb;
4729                 sbale[1].length = sizeof(struct fsf_qtcb);
4730         }
4731
4732         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4733                        fsf_req->sbal_number, fsf_req->sbal_first);
4734
4735         goto success;
4736
4737  failed_sbals:
4738 /* dequeue new FSF request previously enqueued */
4739         zfcp_fsf_req_free(fsf_req);
4740         fsf_req = NULL;
4741
4742  failed_fsf_req:
4743         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4744  success:
4745         *fsf_req_p = fsf_req;
4746         return ret;
4747 }
4748
4749 /*
4750  * function:    zfcp_fsf_req_send
4751  *
4752  * purpose:     start transfer of FSF request via QDIO
4753  *
4754  * returns:     0 - request transfer succesfully started
4755  *              !0 - start of request transfer failed
4756  */
4757 static int
4758 zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req, struct timer_list *timer)
4759 {
4760         struct zfcp_adapter *adapter;
4761         struct zfcp_qdio_queue *req_queue;
4762         volatile struct qdio_buffer_element *sbale;
4763         int new_distance_from_int;
4764         unsigned long flags;
4765         int inc_seq_no = 1;
4766         int retval = 0;
4767
4768         adapter = fsf_req->adapter;
4769         req_queue = &adapter->request_queue,
4770
4771
4772         /* FIXME(debug): remove it later */
4773         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4774         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4775         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4776         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4777                       sbale[1].length);
4778
4779         /* set sequence counter in QTCB */
4780         if (likely(fsf_req->qtcb)) {
4781                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4782                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4783                 ZFCP_LOG_TRACE("FSF request %p of adapter %s gets "
4784                                "FSF sequence counter value of %i\n",
4785                                fsf_req,
4786                                zfcp_get_busid_by_adapter(adapter),
4787                                fsf_req->qtcb->prefix.req_seq_no);
4788         } else
4789                 inc_seq_no = 0;
4790
4791         /* put allocated FSF request at list tail */
4792         spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4793         list_add_tail(&fsf_req->list, &adapter->fsf_req_list_head);
4794         spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4795
4796         /* figure out expiration time of timeout and start timeout */
4797         if (unlikely(timer)) {
4798                 timer->expires += jiffies;
4799                 add_timer(timer);
4800         }
4801
4802         ZFCP_LOG_TRACE("request queue of adapter %s: "
4803                        "next free SBAL is %i, %i free SBALs\n",
4804                        zfcp_get_busid_by_adapter(adapter),
4805                        req_queue->free_index,
4806                        atomic_read(&req_queue->free_count));
4807
4808         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4809                        "index_in_queue=%i, count=%i, buffers=%p\n",
4810                        zfcp_get_busid_by_adapter(adapter),
4811                        QDIO_FLAG_SYNC_OUTPUT,
4812                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4813                        &req_queue->buffer[fsf_req->sbal_first]);
4814
4815         /*
4816          * adjust the number of free SBALs in request queue as well as
4817          * position of first one
4818          */
4819         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4820         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4821         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4822         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4823         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4824
4825         retval = do_QDIO(adapter->ccw_device,
4826                          QDIO_FLAG_SYNC_OUTPUT,
4827                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4828
4829         if (unlikely(retval)) {
4830                 /* Queues are down..... */
4831                 retval = -EIO;
4832                 /*
4833                  * FIXME(potential race):
4834                  * timer might be expired (absolutely unlikely)
4835                  */
4836                 if (timer)
4837                         del_timer(timer);
4838                 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
4839                 list_del(&fsf_req->list);
4840                 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
4841                 /*
4842                  * adjust the number of free SBALs in request queue as well as
4843                  * position of first one
4844                  */
4845                 zfcp_qdio_zero_sbals(req_queue->buffer,
4846                                      fsf_req->sbal_first, fsf_req->sbal_number);
4847                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4848                 req_queue->free_index -= fsf_req->sbal_number;   /* increase */
4849                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4850                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4851                 ZFCP_LOG_DEBUG
4852                         ("error: do_QDIO failed. Buffers could not be enqueued "
4853                          "to request queue.\n");
4854         } else {
4855                 req_queue->distance_from_int = new_distance_from_int;
4856                 /*
4857                  * increase FSF sequence counter -
4858                  * this must only be done for request successfully enqueued to
4859                  * QDIO this rejected requests may be cleaned up by calling
4860                  * routines  resulting in missing sequence counter values
4861                  * otherwise,
4862                  */
4863                 /* Don't increase for unsolicited status */
4864                 if (likely(inc_seq_no)) {
4865                         adapter->fsf_req_seq_no++;
4866                         ZFCP_LOG_TRACE
4867                             ("FSF sequence counter value of adapter %s "
4868                              "increased to %i\n",
4869                              zfcp_get_busid_by_adapter(adapter),
4870                              adapter->fsf_req_seq_no);
4871                 }
4872                 /* count FSF requests pending */
4873                 atomic_inc(&adapter->fsf_reqs_active);
4874         }
4875         return retval;
4876 }
4877
4878 #undef ZFCP_LOG_AREA