SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/scsi/zfcp_fsf.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Implementation of FSF commands.
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/blktrace_api.h>
  13 #include "zfcp_ext.h"
  14
  15 #define ZFCP_REQ_AUTO_CLEANUP   0x00000002
  16 #define ZFCP_REQ_NO_QTCB        0x00000008
  17
  18 static void zfcp_fsf_request_timeout_handler(unsigned long data)
  19 {
  20         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
  21         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
  22                                 "fsrth_1", NULL);
  23 }
  24
  25 static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
  26                                  unsigned long timeout)
  27 {
  28         fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
  29         fsf_req->timer.data = (unsigned long) fsf_req->adapter;
  30         fsf_req->timer.expires = jiffies + timeout;
  31         add_timer(&fsf_req->timer);
  32 }
  33
  34 static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
  35 {
  36         BUG_ON(!fsf_req->erp_action);
  37         fsf_req->timer.function = zfcp_erp_timeout_handler;
  38         fsf_req->timer.data = (unsigned long) fsf_req->erp_action;
  39         fsf_req->timer.expires = jiffies + 30 * HZ;
  40         add_timer(&fsf_req->timer);
  41 }
  42
  43 /* association between FSF command and FSF QTCB type */
  44 static u32 fsf_qtcb_type[] = {
  45         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  46         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  47         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  48         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  49         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  50         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  51         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  52         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  53         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  54         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  55         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  56         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  57         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  58 };
  59
  60 static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
  61 {
  62         u16 subtable = table >> 16;
  63         u16 rule = table & 0xffff;
  64         const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };
  65
  66         if (subtable && subtable < ARRAY_SIZE(act_type))
  67                 dev_warn(&adapter->ccw_device->dev,
  68                          "Access denied according to ACT rule type %s, "
  69                          "rule %d\n", act_type[subtable], rule);
  70 }
  71
  72 static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
  73                                         struct zfcp_port *port)
  74 {
  75         struct fsf_qtcb_header *header = &req->qtcb->header;
  76         dev_warn(&req->adapter->ccw_device->dev,
  77                  "Access denied to port 0x%016Lx\n",
  78                  (unsigned long long)port->wwpn);
  79         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  80         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  81         zfcp_erp_port_access_denied(port, "fspad_1", req);
  82         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  83 }
  84
  85 static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
  86                                         struct zfcp_unit *unit)
  87 {
  88         struct fsf_qtcb_header *header = &req->qtcb->header;
  89         dev_warn(&req->adapter->ccw_device->dev,
  90                  "Access denied to unit 0x%016Lx on port 0x%016Lx\n",
  91                  (unsigned long long)unit->fcp_lun,
  92                  (unsigned long long)unit->port->wwpn);
  93         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  94         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  95         zfcp_erp_unit_access_denied(unit, "fsuad_1", req);
  96         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  97 }
  98
  99 static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
 100 {
 101         dev_err(&req->adapter->ccw_device->dev, "FCP device not "
 102                 "operational because of an unsupported FC class\n");
 103         zfcp_erp_adapter_shutdown(req->adapter, 0, "fscns_1", req);
 104         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 105 }
 106
 107 /**
 108  * zfcp_fsf_req_free - free memory used by fsf request
 109  * @fsf_req: pointer to struct zfcp_fsf_req
 110  */
 111 void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
 112 {
 113         if (likely(req->pool)) {
 114                 mempool_free(req, req->pool);
 115                 return;
 116         }
 117
 118         if (req->qtcb) {
 119                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, req);
 120                 return;
 121         }
 122 }
 123
 124 /**
 125  * zfcp_fsf_req_dismiss_all - dismiss all fsf requests
 126  * @adapter: pointer to struct zfcp_adapter
 127  *
 128  * Never ever call this without shutting down the adapter first.
 129  * Otherwise the adapter would continue using and corrupting s390 storage.
 130  * Included BUG_ON() call to ensure this is done.
 131  * ERP is supposed to be the only user of this function.
 132  */
 133 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 134 {
 135         struct zfcp_fsf_req *req, *tmp;
 136         unsigned long flags;
 137         LIST_HEAD(remove_queue);
 138         unsigned int i;
 139
 140         BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
 141         spin_lock_irqsave(&adapter->req_list_lock, flags);
 142         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 143                 list_splice_init(&adapter->req_list[i], &remove_queue);
 144         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 145
 146         list_for_each_entry_safe(req, tmp, &remove_queue, list) {
 147                 list_del(&req->list);
 148                 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 149                 zfcp_fsf_req_complete(req);
 150         }
 151 }
 152
 153 static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
 154 {
 155         struct fsf_status_read_buffer *sr_buf = req->data;
 156         struct zfcp_adapter *adapter = req->adapter;
 157         struct zfcp_port *port;
 158         int d_id = sr_buf->d_id & ZFCP_DID_MASK;
 159         unsigned long flags;
 160
 161         read_lock_irqsave(&zfcp_data.config_lock, flags);
 162         list_for_each_entry(port, &adapter->port_list_head, list)
 163                 if (port->d_id == d_id) {
 164                         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 165                         zfcp_erp_port_reopen(port, 0, "fssrpc1", req);
 166                         return;
 167                 }
 168         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 169 }
 170
 171 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, char *id,
 172                                          struct fsf_link_down_info *link_down)
 173 {
 174         struct zfcp_adapter *adapter = req->adapter;
 175         unsigned long flags;
 176
 177         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 178                 return;
 179
 180         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 181
 182         read_lock_irqsave(&zfcp_data.config_lock, flags);
 183         zfcp_scsi_schedule_rports_block(adapter);
 184         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 185
 186         if (!link_down)
 187                 goto out;
 188
 189         switch (link_down->error_code) {
 190         case FSF_PSQ_LINK_NO_LIGHT:
 191                 dev_warn(&req->adapter->ccw_device->dev,
 192                          "There is no light signal from the local "
 193                          "fibre channel cable\n");
 194                 break;
 195         case FSF_PSQ_LINK_WRAP_PLUG:
 196                 dev_warn(&req->adapter->ccw_device->dev,
 197                          "There is a wrap plug instead of a fibre "
 198                          "channel cable\n");
 199                 break;
 200         case FSF_PSQ_LINK_NO_FCP:
 201                 dev_warn(&req->adapter->ccw_device->dev,
 202                          "The adjacent fibre channel node does not "
 203                          "support FCP\n");
 204                 break;
 205         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 206                 dev_warn(&req->adapter->ccw_device->dev,
 207                          "The FCP device is suspended because of a "
 208                          "firmware update\n");
 209                 break;
 210         case FSF_PSQ_LINK_INVALID_WWPN:
 211                 dev_warn(&req->adapter->ccw_device->dev,
 212                          "The FCP device detected a WWPN that is "
 213                          "duplicate or not valid\n");
 214                 break;
 215         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 216                 dev_warn(&req->adapter->ccw_device->dev,
 217                          "The fibre channel fabric does not support NPIV\n");
 218                 break;
 219         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 220                 dev_warn(&req->adapter->ccw_device->dev,
 221                          "The FCP adapter cannot support more NPIV ports\n");
 222                 break;
 223         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 224                 dev_warn(&req->adapter->ccw_device->dev,
 225                          "The adjacent switch cannot support "
 226                          "more NPIV ports\n");
 227                 break;
 228         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 229                 dev_warn(&req->adapter->ccw_device->dev,
 230                          "The FCP adapter could not log in to the "
 231                          "fibre channel fabric\n");
 232                 break;
 233         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 234                 dev_warn(&req->adapter->ccw_device->dev,
 235                          "The WWPN assignment file on the FCP adapter "
 236                          "has been damaged\n");
 237                 break;
 238         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 239                 dev_warn(&req->adapter->ccw_device->dev,
 240                          "The mode table on the FCP adapter "
 241                          "has been damaged\n");
 242                 break;
 243         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 244                 dev_warn(&req->adapter->ccw_device->dev,
 245                          "All NPIV ports on the FCP adapter have "
 246                          "been assigned\n");
 247                 break;
 248         default:
 249                 dev_warn(&req->adapter->ccw_device->dev,
 250                          "The link between the FCP adapter and "
 251                          "the FC fabric is down\n");
 252         }
 253 out:
 254         zfcp_erp_adapter_failed(adapter, id, req);
 255 }
 256
 257 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 258 {
 259         struct fsf_status_read_buffer *sr_buf = req->data;
 260         struct fsf_link_down_info *ldi =
 261                 (struct fsf_link_down_info *) &sr_buf->payload;
 262
 263         switch (sr_buf->status_subtype) {
 264         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 265                 zfcp_fsf_link_down_info_eval(req, "fssrld1", ldi);
 266                 break;
 267         case FSF_STATUS_READ_SUB_FDISC_FAILED:
 268                 zfcp_fsf_link_down_info_eval(req, "fssrld2", ldi);
 269                 break;
 270         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 271                 zfcp_fsf_link_down_info_eval(req, "fssrld3", NULL);
 272         };
 273 }
 274
 275 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 276 {
 277         struct zfcp_adapter *adapter = req->adapter;
 278         struct fsf_status_read_buffer *sr_buf = req->data;
 279
 280         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 281                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, sr_buf);
 282                 mempool_free(sr_buf, adapter->pool.data_status_read);
 283                 zfcp_fsf_req_free(req);
 284                 return;
 285         }
 286
 287         zfcp_hba_dbf_event_fsf_unsol("read", adapter, sr_buf);
 288
 289         switch (sr_buf->status_type) {
 290         case FSF_STATUS_READ_PORT_CLOSED:
 291                 zfcp_fsf_status_read_port_closed(req);
 292                 break;
 293         case FSF_STATUS_READ_INCOMING_ELS:
 294                 zfcp_fc_incoming_els(req);
 295                 break;
 296         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 297                 break;
 298         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 299                 dev_warn(&adapter->ccw_device->dev,
 300                          "The error threshold for checksum statistics "
 301                          "has been exceeded\n");
 302                 zfcp_hba_dbf_event_berr(adapter, req);
 303                 break;
 304         case FSF_STATUS_READ_LINK_DOWN:
 305                 zfcp_fsf_status_read_link_down(req);
 306                 break;
 307         case FSF_STATUS_READ_LINK_UP:
 308                 dev_info(&adapter->ccw_device->dev,
 309                          "The local link has been restored\n");
 310                 /* All ports should be marked as ready to run again */
 311                 zfcp_erp_modify_adapter_status(adapter, "fssrh_1", NULL,
 312                                                ZFCP_STATUS_COMMON_RUNNING,
 313                                                ZFCP_SET);
 314                 zfcp_erp_adapter_reopen(adapter,
 315                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 316                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 317                                         "fssrh_2", req);
 318                 break;
 319         case FSF_STATUS_READ_NOTIFICATION_LOST:
 320                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
 321                         zfcp_erp_adapter_access_changed(adapter, "fssrh_3",
 322                                                         req);
 323                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
 324                         schedule_work(&adapter->scan_work);
 325                 break;
 326         case FSF_STATUS_READ_CFDC_UPDATED:
 327                 zfcp_erp_adapter_access_changed(adapter, "fssrh_4", req);
 328                 break;
 329         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 330                 adapter->adapter_features = sr_buf->payload.word[0];
 331                 break;
 332         }
 333
 334         mempool_free(sr_buf, adapter->pool.data_status_read);
 335         zfcp_fsf_req_free(req);
 336
 337         atomic_inc(&adapter->stat_miss);
 338         queue_work(zfcp_data.work_queue, &adapter->stat_work);
 339 }
 340
 341 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 342 {
 343         switch (req->qtcb->header.fsf_status_qual.word[0]) {
 344         case FSF_SQ_FCP_RSP_AVAILABLE:
 345         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 346         case FSF_SQ_NO_RETRY_POSSIBLE:
 347         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 348                 return;
 349         case FSF_SQ_COMMAND_ABORTED:
 350                 req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 351                 break;
 352         case FSF_SQ_NO_RECOM:
 353                 dev_err(&req->adapter->ccw_device->dev,
 354                         "The FCP adapter reported a problem "
 355                         "that cannot be recovered\n");
 356                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfsqe1", req);
 357                 break;
 358         }
 359         /* all non-return stats set FSFREQ_ERROR*/
 360         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 361 }
 362
 363 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 364 {
 365         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 366                 return;
 367
 368         switch (req->qtcb->header.fsf_status) {
 369         case FSF_UNKNOWN_COMMAND:
 370                 dev_err(&req->adapter->ccw_device->dev,
 371                         "The FCP adapter does not recognize the command 0x%x\n",
 372                         req->qtcb->header.fsf_command);
 373                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfse_1", req);
 374                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 375                 break;
 376         case FSF_ADAPTER_STATUS_AVAILABLE:
 377                 zfcp_fsf_fsfstatus_qual_eval(req);
 378                 break;
 379         }
 380 }
 381
 382 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 383 {
 384         struct zfcp_adapter *adapter = req->adapter;
 385         struct fsf_qtcb *qtcb = req->qtcb;
 386         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 387
 388         zfcp_hba_dbf_event_fsf_response(req);
 389
 390         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 391                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 392                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 393                 return;
 394         }
 395
 396         switch (qtcb->prefix.prot_status) {
 397         case FSF_PROT_GOOD:
 398         case FSF_PROT_FSF_STATUS_PRESENTED:
 399                 return;
 400         case FSF_PROT_QTCB_VERSION_ERROR:
 401                 dev_err(&adapter->ccw_device->dev,
 402                         "QTCB version 0x%x not supported by FCP adapter "
 403                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
 404                         psq->word[0], psq->word[1]);
 405                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_1", req);
 406                 break;
 407         case FSF_PROT_ERROR_STATE:
 408         case FSF_PROT_SEQ_NUMB_ERROR:
 409                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_2", req);
 410                 req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 411                 break;
 412         case FSF_PROT_UNSUPP_QTCB_TYPE:
 413                 dev_err(&adapter->ccw_device->dev,
 414                         "The QTCB type is not supported by the FCP adapter\n");
 415                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_3", req);
 416                 break;
 417         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 418                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 419                                 &adapter->status);
 420                 break;
 421         case FSF_PROT_DUPLICATE_REQUEST_ID:
 422                 dev_err(&adapter->ccw_device->dev,
 423                         "0x%Lx is an ambiguous request identifier\n",
 424                         (unsigned long long)qtcb->bottom.support.req_handle);
 425                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_4", req);
 426                 break;
 427         case FSF_PROT_LINK_DOWN:
 428                 zfcp_fsf_link_down_info_eval(req, "fspse_5",
 429                                              &psq->link_down_info);
 430                 /* FIXME: reopening adapter now? better wait for link up */
 431                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_6", req);
 432                 break;
 433         case FSF_PROT_REEST_QUEUE:
 434                 /* All ports should be marked as ready to run again */
 435                 zfcp_erp_modify_adapter_status(adapter, "fspse_7", NULL,
 436                                                ZFCP_STATUS_COMMON_RUNNING,
 437                                                ZFCP_SET);
 438                 zfcp_erp_adapter_reopen(adapter,
 439                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 440                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 441                                         "fspse_8", req);
 442                 break;
 443         default:
 444                 dev_err(&adapter->ccw_device->dev,
 445                         "0x%x is not a valid transfer protocol status\n",
 446                         qtcb->prefix.prot_status);
 447                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_9", req);
 448         }
 449         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 450 }
 451
 452 /**
 453  * zfcp_fsf_req_complete - process completion of a FSF request
 454  * @fsf_req: The FSF request that has been completed.
 455  *
 456  * When a request has been completed either from the FCP adapter,
 457  * or it has been dismissed due to a queue shutdown, this function
 458  * is called to process the completion status and trigger further
 459  * events related to the FSF request.
 460  */
 461 void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 462 {
 463         if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 464                 zfcp_fsf_status_read_handler(req);
 465                 return;
 466         }
 467
 468         del_timer(&req->timer);
 469         zfcp_fsf_protstatus_eval(req);
 470         zfcp_fsf_fsfstatus_eval(req);
 471         req->handler(req);
 472
 473         if (req->erp_action)
 474                 zfcp_erp_notify(req->erp_action, 0);
 475         req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 476
 477         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 478                 zfcp_fsf_req_free(req);
 479         else
 480         /* notify initiator waiting for the requests completion */
 481         /*
 482          * FIXME: Race! We must not access fsf_req here as it might have been
 483          * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 484          * flag. It's an improbable case. But, we have the same paranoia for
 485          * the cleanup flag already.
 486          * Might better be handled using complete()?
 487          * (setting the flag and doing wakeup ought to be atomic
 488          *  with regard to checking the flag as long as waitqueue is
 489          *  part of the to be released structure)
 490          */
 491                 wake_up(&req->completion_wq);
 492 }
 493
 494 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 495 {
 496         struct fsf_qtcb_bottom_config *bottom;
 497         struct zfcp_adapter *adapter = req->adapter;
 498         struct Scsi_Host *shost = adapter->scsi_host;
 499
 500         bottom = &req->qtcb->bottom.config;
 501
 502         if (req->data)
 503                 memcpy(req->data, bottom, sizeof(*bottom));
 504
 505         fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
 506         fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
 507         fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
 508         fc_host_speed(shost) = bottom->fc_link_speed;
 509         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 510
 511         adapter->hydra_version = bottom->adapter_type;
 512         adapter->timer_ticks = bottom->timer_interval;
 513
 514         if (fc_host_permanent_port_name(shost) == -1)
 515                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 516
 517         switch (bottom->fc_topology) {
 518         case FSF_TOPO_P2P:
 519                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
 520                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
 521                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
 522                 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
 523                 break;
 524         case FSF_TOPO_FABRIC:
 525                 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
 526                 break;
 527         case FSF_TOPO_AL:
 528                 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
 529                 /* fall through */
 530         default:
 531                 dev_err(&adapter->ccw_device->dev,
 532                         "Unknown or unsupported arbitrated loop "
 533                         "fibre channel topology detected\n");
 534                 zfcp_erp_adapter_shutdown(adapter, 0, "fsece_1", req);
 535                 return -EIO;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 542 {
 543         struct zfcp_adapter *adapter = req->adapter;
 544         struct fsf_qtcb *qtcb = req->qtcb;
 545         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 546         struct Scsi_Host *shost = adapter->scsi_host;
 547
 548         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 549                 return;
 550
 551         adapter->fsf_lic_version = bottom->lic_version;
 552         adapter->adapter_features = bottom->adapter_features;
 553         adapter->connection_features = bottom->connection_features;
 554         adapter->peer_wwpn = 0;
 555         adapter->peer_wwnn = 0;
 556         adapter->peer_d_id = 0;
 557
 558         switch (qtcb->header.fsf_status) {
 559         case FSF_GOOD:
 560                 if (zfcp_fsf_exchange_config_evaluate(req))
 561                         return;
 562
 563                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 564                         dev_err(&adapter->ccw_device->dev,
 565                                 "FCP adapter maximum QTCB size (%d bytes) "
 566                                 "is too small\n",
 567                                 bottom->max_qtcb_size);
 568                         zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh1", req);
 569                         return;
 570                 }
 571                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 572                                 &adapter->status);
 573                 break;
 574         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 575                 fc_host_node_name(shost) = 0;
 576                 fc_host_port_name(shost) = 0;
 577                 fc_host_port_id(shost) = 0;
 578                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 579                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 580                 adapter->hydra_version = 0;
 581
 582                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 583                                 &adapter->status);
 584
 585                 zfcp_fsf_link_down_info_eval(req, "fsecdh2",
 586                         &qtcb->header.fsf_status_qual.link_down_info);
 587                 break;
 588         default:
 589                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh3", req);
 590                 return;
 591         }
 592
 593         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 594                 adapter->hardware_version = bottom->hardware_version;
 595                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
 596                        min(FC_SERIAL_NUMBER_SIZE, 17));
 597                 EBCASC(fc_host_serial_number(shost),
 598                        min(FC_SERIAL_NUMBER_SIZE, 17));
 599         }
 600
 601         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 602                 dev_err(&adapter->ccw_device->dev,
 603                         "The FCP adapter only supports newer "
 604                         "control block versions\n");
 605                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh4", req);
 606                 return;
 607         }
 608         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 609                 dev_err(&adapter->ccw_device->dev,
 610                         "The FCP adapter only supports older "
 611                         "control block versions\n");
 612                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh5", req);
 613         }
 614 }
 615
 616 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 617 {
 618         struct zfcp_adapter *adapter = req->adapter;
 619         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 620         struct Scsi_Host *shost = adapter->scsi_host;
 621
 622         if (req->data)
 623                 memcpy(req->data, bottom, sizeof(*bottom));
 624
 625         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) {
 626                 fc_host_permanent_port_name(shost) = bottom->wwpn;
 627                 fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
 628         } else
 629                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 630         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 631         fc_host_supported_speeds(shost) = bottom->supported_speed;
 632 }
 633
 634 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 635 {
 636         struct fsf_qtcb *qtcb = req->qtcb;
 637
 638         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 639                 return;
 640
 641         switch (qtcb->header.fsf_status) {
 642         case FSF_GOOD:
 643                 zfcp_fsf_exchange_port_evaluate(req);
 644                 break;
 645         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 646                 zfcp_fsf_exchange_port_evaluate(req);
 647                 zfcp_fsf_link_down_info_eval(req, "fsepdh1",
 648                         &qtcb->header.fsf_status_qual.link_down_info);
 649                 break;
 650         }
 651 }
 652
 653 static int zfcp_fsf_sbal_check(struct zfcp_adapter *adapter)
 654 {
 655         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 656
 657         spin_lock_bh(&adapter->req_q_lock);
 658         if (atomic_read(&req_q->count))
 659                 return 1;
 660         spin_unlock_bh(&adapter->req_q_lock);
 661         return 0;
 662 }
 663
 664 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 665 {
 666         long ret;
 667
 668         spin_unlock_bh(&adapter->req_q_lock);
 669         ret = wait_event_interruptible_timeout(adapter->request_wq,
 670                                zfcp_fsf_sbal_check(adapter), 5 * HZ);
 671         if (ret > 0)
 672                 return 0;
 673         if (!ret)
 674                 atomic_inc(&adapter->qdio_outb_full);
 675
 676         spin_lock_bh(&adapter->req_q_lock);
 677         return -EIO;
 678 }
 679
 680 static struct zfcp_fsf_req *zfcp_fsf_alloc_noqtcb(mempool_t *pool)
 681 {
 682         struct zfcp_fsf_req *req;
 683         req = mempool_alloc(pool, GFP_ATOMIC);
 684         if (!req)
 685                 return NULL;
 686         memset(req, 0, sizeof(*req));
 687         req->pool = pool;
 688         return req;
 689 }
 690
 691 static struct zfcp_fsf_req *zfcp_fsf_alloc_qtcb(mempool_t *pool)
 692 {
 693         struct zfcp_fsf_req_qtcb *qtcb;
 694
 695         if (likely(pool))
 696                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
 697         else
 698                 qtcb = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 699                                         GFP_ATOMIC);
 700         if (unlikely(!qtcb))
 701                 return NULL;
 702
 703         memset(qtcb, 0, sizeof(*qtcb));
 704         qtcb->fsf_req.qtcb = &qtcb->qtcb;
 705         qtcb->fsf_req.pool = pool;
 706
 707         return &qtcb->fsf_req;
 708 }
 709
 710 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
 711                                                 u32 fsf_cmd, int req_flags,
 712                                                 mempool_t *pool)
 713 {
 714         struct qdio_buffer_element *sbale;
 715
 716         struct zfcp_fsf_req *req;
 717         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 718
 719         if (req_flags & ZFCP_REQ_NO_QTCB)
 720                 req = zfcp_fsf_alloc_noqtcb(pool);
 721         else
 722                 req = zfcp_fsf_alloc_qtcb(pool);
 723
 724         if (unlikely(!req))
 725                 return ERR_PTR(-EIO);
 726
 727         if (adapter->req_no == 0)
 728                 adapter->req_no++;
 729
 730         INIT_LIST_HEAD(&req->list);
 731         init_timer(&req->timer);
 732         init_waitqueue_head(&req->completion_wq);
 733
 734         req->adapter = adapter;
 735         req->fsf_command = fsf_cmd;
 736         req->req_id = adapter->req_no;
 737         req->sbal_number = 1;
 738         req->sbal_first = req_q->first;
 739         req->sbal_last = req_q->first;
 740         req->sbale_curr = 1;
 741
 742         sbale = zfcp_qdio_sbale_req(req);
 743         sbale[0].addr = (void *) req->req_id;
 744         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 745
 746         if (likely(req->qtcb)) {
 747                 req->qtcb->prefix.req_seq_no = req->adapter->fsf_req_seq_no;
 748                 req->qtcb->prefix.req_id = req->req_id;
 749                 req->qtcb->prefix.ulp_info = 26;
 750                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command];
 751                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
 752                 req->qtcb->header.req_handle = req->req_id;
 753                 req->qtcb->header.fsf_command = req->fsf_command;
 754                 req->seq_no = adapter->fsf_req_seq_no;
 755                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 756                 sbale[1].addr = (void *) req->qtcb;
 757                 sbale[1].length = sizeof(struct fsf_qtcb);
 758         }
 759
 760         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) {
 761                 zfcp_fsf_req_free(req);
 762                 return ERR_PTR(-EIO);
 763         }
 764
 765         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP))
 766                 req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
 767
 768         return req;
 769 }
 770
 771 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 772 {
 773         struct zfcp_adapter *adapter = req->adapter;
 774         unsigned long        flags;
 775         int                  idx;
 776         int                  with_qtcb = (req->qtcb != NULL);
 777
 778         /* put allocated FSF request into hash table */
 779         spin_lock_irqsave(&adapter->req_list_lock, flags);
 780         idx = zfcp_reqlist_hash(req->req_id);
 781         list_add_tail(&req->list, &adapter->req_list[idx]);
 782         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 783
 784         req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
 785         req->issued = get_clock();
 786         if (zfcp_qdio_send(req)) {
 787                 del_timer(&req->timer);
 788                 spin_lock_irqsave(&adapter->req_list_lock, flags);
 789                 /* lookup request again, list might have changed */
 790                 if (zfcp_reqlist_find_safe(adapter, req))
 791                         zfcp_reqlist_remove(adapter, req);
 792                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 793                 zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1", req);
 794                 return -EIO;
 795         }
 796
 797         /* Don't increase for unsolicited status */
 798         if (with_qtcb)
 799                 adapter->fsf_req_seq_no++;
 800         adapter->req_no++;
 801
 802         return 0;
 803 }
 804
 805 /**
 806  * zfcp_fsf_status_read - send status read request
 807  * @adapter: pointer to struct zfcp_adapter
 808  * @req_flags: request flags
 809  * Returns: 0 on success, ERROR otherwise
 810  */
 811 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 812 {
 813         struct zfcp_fsf_req *req;
 814         struct fsf_status_read_buffer *sr_buf;
 815         struct qdio_buffer_element *sbale;
 816         int retval = -EIO;
 817
 818         spin_lock_bh(&adapter->req_q_lock);
 819         if (zfcp_fsf_req_sbal_get(adapter))
 820                 goto out;
 821
 822         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 823                                   ZFCP_REQ_NO_QTCB,
 824                                   adapter->pool.fsf_req_status_read);
 825         if (IS_ERR(req)) {
 826                 retval = PTR_ERR(req);
 827                 goto out;
 828         }
 829
 830         sbale = zfcp_qdio_sbale_req(req);
 831         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 832         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 833         req->sbale_curr = 2;
 834
 835         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 836         if (!sr_buf) {
 837                 retval = -ENOMEM;
 838                 goto failed_buf;
 839         }
 840         memset(sr_buf, 0, sizeof(*sr_buf));
 841         req->data = sr_buf;
 842         sbale = zfcp_qdio_sbale_curr(req);
 843         sbale->addr = (void *) sr_buf;
 844         sbale->length = sizeof(*sr_buf);
 845
 846         retval = zfcp_fsf_req_send(req);
 847         if (retval)
 848                 goto failed_req_send;
 849
 850         goto out;
 851
 852 failed_req_send:
 853         mempool_free(sr_buf, adapter->pool.data_status_read);
 854 failed_buf:
 855         zfcp_fsf_req_free(req);
 856         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 857 out:
 858         spin_unlock_bh(&adapter->req_q_lock);
 859         return retval;
 860 }
 861
 862 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 863 {
 864         struct zfcp_unit *unit = req->data;
 865         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 866
 867         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 868                 return;
 869
 870         switch (req->qtcb->header.fsf_status) {
 871         case FSF_PORT_HANDLE_NOT_VALID:
 872                 if (fsq->word[0] == fsq->word[1]) {
 873                         zfcp_erp_adapter_reopen(unit->port->adapter, 0,
 874                                                 "fsafch1", req);
 875                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 876                 }
 877                 break;
 878         case FSF_LUN_HANDLE_NOT_VALID:
 879                 if (fsq->word[0] == fsq->word[1]) {
 880                         zfcp_erp_port_reopen(unit->port, 0, "fsafch2", req);
 881                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 882                 }
 883                 break;
 884         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 885                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 886                 break;
 887         case FSF_PORT_BOXED:
 888                 zfcp_erp_port_boxed(unit->port, "fsafch3", req);
 889                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 890                                ZFCP_STATUS_FSFREQ_RETRY;
 891                 break;
 892         case FSF_LUN_BOXED:
 893                 zfcp_erp_unit_boxed(unit, "fsafch4", req);
 894                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 895                                ZFCP_STATUS_FSFREQ_RETRY;
 896                 break;
 897         case FSF_ADAPTER_STATUS_AVAILABLE:
 898                 switch (fsq->word[0]) {
 899                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 900                         zfcp_test_link(unit->port);
 901                         /* fall through */
 902                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 903                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 904                         break;
 905                 }
 906                 break;
 907         case FSF_GOOD:
 908                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 909                 break;
 910         }
 911 }
 912
 913 /**
 914  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 915  * @old_req_id: unsigned long
 916  * @unit: pointer to struct zfcp_unit
 917  * Returns: pointer to struct zfcp_fsf_req
 918  */
 919
 920 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 921                                                 struct zfcp_unit *unit)
 922 {
 923         struct qdio_buffer_element *sbale;
 924         struct zfcp_fsf_req *req = NULL;
 925         struct zfcp_adapter *adapter = unit->port->adapter;
 926
 927         spin_lock_bh(&adapter->req_q_lock);
 928         if (zfcp_fsf_req_sbal_get(adapter))
 929                 goto out;
 930         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 931                                   0, adapter->pool.fsf_req_abort);
 932         if (IS_ERR(req)) {
 933                 req = NULL;
 934                 goto out;
 935         }
 936
 937         if (unlikely(!(atomic_read(&unit->status) &
 938                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 939                 goto out_error_free;
 940
 941         sbale = zfcp_qdio_sbale_req(req);
 942         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 943         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 944
 945         req->data = unit;
 946         req->handler = zfcp_fsf_abort_fcp_command_handler;
 947         req->qtcb->header.lun_handle = unit->handle;
 948         req->qtcb->header.port_handle = unit->port->handle;
 949         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 950
 951         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 952         if (!zfcp_fsf_req_send(req))
 953                 goto out;
 954
 955 out_error_free:
 956         zfcp_fsf_req_free(req);
 957         req = NULL;
 958 out:
 959         spin_unlock_bh(&adapter->req_q_lock);
 960         return req;
 961 }
 962
 963 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 964 {
 965         struct zfcp_adapter *adapter = req->adapter;
 966         struct zfcp_send_ct *send_ct = req->data;
 967         struct fsf_qtcb_header *header = &req->qtcb->header;
 968
 969         send_ct->status = -EINVAL;
 970
 971         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 972                 goto skip_fsfstatus;
 973
 974         switch (header->fsf_status) {
 975         case FSF_GOOD:
 976                 zfcp_san_dbf_event_ct_response(req);
 977                 send_ct->status = 0;
 978                 break;
 979         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 980                 zfcp_fsf_class_not_supp(req);
 981                 break;
 982         case FSF_ADAPTER_STATUS_AVAILABLE:
 983                 switch (header->fsf_status_qual.word[0]){
 984                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 985                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 986                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 987                         break;
 988                 }
 989                 break;
 990         case FSF_ACCESS_DENIED:
 991                 break;
 992         case FSF_PORT_BOXED:
 993                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 994                                ZFCP_STATUS_FSFREQ_RETRY;
 995                 break;
 996         case FSF_PORT_HANDLE_NOT_VALID:
 997                 zfcp_erp_adapter_reopen(adapter, 0, "fsscth1", req);
 998                 /* fall through */
 999         case FSF_GENERIC_COMMAND_REJECTED:
1000         case FSF_PAYLOAD_SIZE_MISMATCH:
1001         case FSF_REQUEST_SIZE_TOO_LARGE:
1002         case FSF_RESPONSE_SIZE_TOO_LARGE:
1003         case FSF_SBAL_MISMATCH:
1004                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1005                 break;
1006         }
1007
1008 skip_fsfstatus:
1009         if (send_ct->handler)
1010                 send_ct->handler(send_ct->handler_data);
1011 }
1012
1013 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1014                                        struct scatterlist *sg_req,
1015                                        struct scatterlist *sg_resp,
1016                                        int max_sbals)
1017 {
1018         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(req);
1019         u32 feat = req->adapter->adapter_features;
1020         int bytes;
1021
1022         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1023                 if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
1024                     !sg_is_last(sg_req) || !sg_is_last(sg_resp))
1025                         return -EOPNOTSUPP;
1026
1027                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1028                 sbale[2].addr   = sg_virt(sg_req);
1029                 sbale[2].length = sg_req->length;
1030                 sbale[3].addr   = sg_virt(sg_resp);
1031                 sbale[3].length = sg_resp->length;
1032                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1033                 return 0;
1034         }
1035
1036         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1037                                         sg_req, max_sbals);
1038         if (bytes <= 0)
1039                 return -ENOMEM;
1040         req->qtcb->bottom.support.req_buf_length = bytes;
1041         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1042
1043         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1044                                         sg_resp, max_sbals);
1045         if (bytes <= 0)
1046                 return -ENOMEM;
1047         req->qtcb->bottom.support.resp_buf_length = bytes;
1048
1049         return 0;
1050 }
1051
1052 /**
1053  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1054  * @ct: pointer to struct zfcp_send_ct with data for request
1055  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1056  * @erp_action: if non-null the Generic Service request sent within ERP
1057  */
1058 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1059                      struct zfcp_erp_action *erp_action)
1060 {
1061         struct zfcp_wka_port *wka_port = ct->wka_port;
1062         struct zfcp_adapter *adapter = wka_port->adapter;
1063         struct zfcp_fsf_req *req;
1064         int ret = -EIO;
1065
1066         spin_lock_bh(&adapter->req_q_lock);
1067         if (zfcp_fsf_req_sbal_get(adapter))
1068                 goto out;
1069
1070         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1071                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1072         if (IS_ERR(req)) {
1073                 ret = PTR_ERR(req);
1074                 goto out;
1075         }
1076
1077         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1078                                           FSF_MAX_SBALS_PER_REQ);
1079         if (ret)
1080                 goto failed_send;
1081
1082         req->handler = zfcp_fsf_send_ct_handler;
1083         req->qtcb->header.port_handle = wka_port->handle;
1084         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1085         req->qtcb->bottom.support.timeout = ct->timeout;
1086         req->data = ct;
1087
1088         zfcp_san_dbf_event_ct_request(req);
1089
1090         if (erp_action) {
1091                 erp_action->fsf_req = req;
1092                 req->erp_action = erp_action;
1093                 zfcp_fsf_start_erp_timer(req);
1094         } else
1095                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1096
1097         ret = zfcp_fsf_req_send(req);
1098         if (ret)
1099                 goto failed_send;
1100
1101         goto out;
1102
1103 failed_send:
1104         zfcp_fsf_req_free(req);
1105         if (erp_action)
1106                 erp_action->fsf_req = NULL;
1107 out:
1108         spin_unlock_bh(&adapter->req_q_lock);
1109         return ret;
1110 }
1111
1112 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1113 {
1114         struct zfcp_send_els *send_els = req->data;
1115         struct zfcp_port *port = send_els->port;
1116         struct fsf_qtcb_header *header = &req->qtcb->header;
1117
1118         send_els->status = -EINVAL;
1119
1120         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1121                 goto skip_fsfstatus;
1122
1123         switch (header->fsf_status) {
1124         case FSF_GOOD:
1125                 zfcp_san_dbf_event_els_response(req);
1126                 send_els->status = 0;
1127                 break;
1128         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1129                 zfcp_fsf_class_not_supp(req);
1130                 break;
1131         case FSF_ADAPTER_STATUS_AVAILABLE:
1132                 switch (header->fsf_status_qual.word[0]){
1133                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1134                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1135                                 zfcp_test_link(port);
1136                         /*fall through */
1137                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1138                 case FSF_SQ_RETRY_IF_POSSIBLE:
1139                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1140                         break;
1141                 }
1142                 break;
1143         case FSF_ELS_COMMAND_REJECTED:
1144         case FSF_PAYLOAD_SIZE_MISMATCH:
1145         case FSF_REQUEST_SIZE_TOO_LARGE:
1146         case FSF_RESPONSE_SIZE_TOO_LARGE:
1147                 break;
1148         case FSF_ACCESS_DENIED:
1149                 zfcp_fsf_access_denied_port(req, port);
1150                 break;
1151         case FSF_SBAL_MISMATCH:
1152                 /* should never occure, avoided in zfcp_fsf_send_els */
1153                 /* fall through */
1154         default:
1155                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1156                 break;
1157         }
1158 skip_fsfstatus:
1159         if (send_els->handler)
1160                 send_els->handler(send_els->handler_data);
1161 }
1162
1163 /**
1164  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1165  * @els: pointer to struct zfcp_send_els with data for the command
1166  */
1167 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1168 {
1169         struct zfcp_fsf_req *req;
1170         struct zfcp_adapter *adapter = els->adapter;
1171         struct fsf_qtcb_bottom_support *bottom;
1172         int ret = -EIO;
1173
1174         spin_lock_bh(&adapter->req_q_lock);
1175         if (zfcp_fsf_req_sbal_get(adapter))
1176                 goto out;
1177         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1178                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1179         if (IS_ERR(req)) {
1180                 ret = PTR_ERR(req);
1181                 goto out;
1182         }
1183
1184         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1185
1186         if (ret)
1187                 goto failed_send;
1188
1189         bottom = &req->qtcb->bottom.support;
1190         req->handler = zfcp_fsf_send_els_handler;
1191         bottom->d_id = els->d_id;
1192         bottom->service_class = FSF_CLASS_3;
1193         bottom->timeout = 2 * R_A_TOV;
1194         req->data = els;
1195
1196         zfcp_san_dbf_event_els_request(req);
1197
1198         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1199         ret = zfcp_fsf_req_send(req);
1200         if (ret)
1201                 goto failed_send;
1202
1203         goto out;
1204
1205 failed_send:
1206         zfcp_fsf_req_free(req);
1207 out:
1208         spin_unlock_bh(&adapter->req_q_lock);
1209         return ret;
1210 }
1211
1212 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1213 {
1214         struct qdio_buffer_element *sbale;
1215         struct zfcp_fsf_req *req;
1216         struct zfcp_adapter *adapter = erp_action->adapter;
1217         int retval = -EIO;
1218
1219         spin_lock_bh(&adapter->req_q_lock);
1220         if (zfcp_fsf_req_sbal_get(adapter))
1221                 goto out;
1222         req = zfcp_fsf_req_create(adapter,
1223                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1224                                   ZFCP_REQ_AUTO_CLEANUP,
1225                                   adapter->pool.fsf_req_erp);
1226         if (IS_ERR(req)) {
1227                 retval = PTR_ERR(req);
1228                 goto out;
1229         }
1230
1231         sbale = zfcp_qdio_sbale_req(req);
1232         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1233         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1234
1235         req->qtcb->bottom.config.feature_selection =
1236                         FSF_FEATURE_CFDC |
1237                         FSF_FEATURE_LUN_SHARING |
1238                         FSF_FEATURE_NOTIFICATION_LOST |
1239                         FSF_FEATURE_UPDATE_ALERT;
1240         req->erp_action = erp_action;
1241         req->handler = zfcp_fsf_exchange_config_data_handler;
1242         erp_action->fsf_req = req;
1243
1244         zfcp_fsf_start_erp_timer(req);
1245         retval = zfcp_fsf_req_send(req);
1246         if (retval) {
1247                 zfcp_fsf_req_free(req);
1248                 erp_action->fsf_req = NULL;
1249         }
1250 out:
1251         spin_unlock_bh(&adapter->req_q_lock);
1252         return retval;
1253 }
1254
1255 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1256                                        struct fsf_qtcb_bottom_config *data)
1257 {
1258         struct qdio_buffer_element *sbale;
1259         struct zfcp_fsf_req *req = NULL;
1260         int retval = -EIO;
1261
1262         spin_lock_bh(&adapter->req_q_lock);
1263         if (zfcp_fsf_req_sbal_get(adapter))
1264                 goto out_unlock;
1265
1266         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1267                                   0, NULL);
1268         if (IS_ERR(req)) {
1269                 retval = PTR_ERR(req);
1270                 goto out_unlock;
1271         }
1272
1273         sbale = zfcp_qdio_sbale_req(req);
1274         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1275         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1276         req->handler = zfcp_fsf_exchange_config_data_handler;
1277
1278         req->qtcb->bottom.config.feature_selection =
1279                         FSF_FEATURE_CFDC |
1280                         FSF_FEATURE_LUN_SHARING |
1281                         FSF_FEATURE_NOTIFICATION_LOST |
1282                         FSF_FEATURE_UPDATE_ALERT;
1283
1284         if (data)
1285                 req->data = data;
1286
1287         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1288         retval = zfcp_fsf_req_send(req);
1289         spin_unlock_bh(&adapter->req_q_lock);
1290         if (!retval)
1291                 wait_event(req->completion_wq,
1292                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1293
1294         zfcp_fsf_req_free(req);
1295         return retval;
1296
1297 out_unlock:
1298         spin_unlock_bh(&adapter->req_q_lock);
1299         return retval;
1300 }
1301
1302 /**
1303  * zfcp_fsf_exchange_port_data - request information about local port
1304  * @erp_action: ERP action for the adapter for which port data is requested
1305  * Returns: 0 on success, error otherwise
1306  */
1307 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1308 {
1309         struct qdio_buffer_element *sbale;
1310         struct zfcp_fsf_req *req;
1311         struct zfcp_adapter *adapter = erp_action->adapter;
1312         int retval = -EIO;
1313
1314         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1315                 return -EOPNOTSUPP;
1316
1317         spin_lock_bh(&adapter->req_q_lock);
1318         if (zfcp_fsf_req_sbal_get(adapter))
1319                 goto out;
1320         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1321                                   ZFCP_REQ_AUTO_CLEANUP,
1322                                   adapter->pool.fsf_req_erp);
1323         if (IS_ERR(req)) {
1324                 retval = PTR_ERR(req);
1325                 goto out;
1326         }
1327
1328         sbale = zfcp_qdio_sbale_req(req);
1329         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1330         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1331
1332         req->handler = zfcp_fsf_exchange_port_data_handler;
1333         req->erp_action = erp_action;
1334         erp_action->fsf_req = req;
1335
1336         zfcp_fsf_start_erp_timer(req);
1337         retval = zfcp_fsf_req_send(req);
1338         if (retval) {
1339                 zfcp_fsf_req_free(req);
1340                 erp_action->fsf_req = NULL;
1341         }
1342 out:
1343         spin_unlock_bh(&adapter->req_q_lock);
1344         return retval;
1345 }
1346
1347 /**
1348  * zfcp_fsf_exchange_port_data_sync - request information about local port
1349  * @adapter: pointer to struct zfcp_adapter
1350  * @data: pointer to struct fsf_qtcb_bottom_port
1351  * Returns: 0 on success, error otherwise
1352  */
1353 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1354                                      struct fsf_qtcb_bottom_port *data)
1355 {
1356         struct qdio_buffer_element *sbale;
1357         struct zfcp_fsf_req *req = NULL;
1358         int retval = -EIO;
1359
1360         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1361                 return -EOPNOTSUPP;
1362
1363         spin_lock_bh(&adapter->req_q_lock);
1364         if (zfcp_fsf_req_sbal_get(adapter))
1365                 goto out_unlock;
1366
1367         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1368                                   NULL);
1369         if (IS_ERR(req)) {
1370                 retval = PTR_ERR(req);
1371                 goto out_unlock;
1372         }
1373
1374         if (data)
1375                 req->data = data;
1376
1377         sbale = zfcp_qdio_sbale_req(req);
1378         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1379         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1380
1381         req->handler = zfcp_fsf_exchange_port_data_handler;
1382         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1383         retval = zfcp_fsf_req_send(req);
1384         spin_unlock_bh(&adapter->req_q_lock);
1385
1386         if (!retval)
1387                 wait_event(req->completion_wq,
1388                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1389         zfcp_fsf_req_free(req);
1390
1391         return retval;
1392
1393 out_unlock:
1394         spin_unlock_bh(&adapter->req_q_lock);
1395         return retval;
1396 }
1397
1398 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1399 {
1400         struct zfcp_port *port = req->data;
1401         struct fsf_qtcb_header *header = &req->qtcb->header;
1402         struct fsf_plogi *plogi;
1403
1404         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1405                 goto out;
1406
1407         switch (header->fsf_status) {
1408         case FSF_PORT_ALREADY_OPEN:
1409                 break;
1410         case FSF_ACCESS_DENIED:
1411                 zfcp_fsf_access_denied_port(req, port);
1412                 break;
1413         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1414                 dev_warn(&req->adapter->ccw_device->dev,
1415                          "Not enough FCP adapter resources to open "
1416                          "remote port 0x%016Lx\n",
1417                          (unsigned long long)port->wwpn);
1418                 zfcp_erp_port_failed(port, "fsoph_1", req);
1419                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1420                 break;
1421         case FSF_ADAPTER_STATUS_AVAILABLE:
1422                 switch (header->fsf_status_qual.word[0]) {
1423                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1424                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1425                 case FSF_SQ_NO_RETRY_POSSIBLE:
1426                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1427                         break;
1428                 }
1429                 break;
1430         case FSF_GOOD:
1431                 port->handle = header->port_handle;
1432                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1433                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1434                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1435                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1436                                   &port->status);
1437                 /* check whether D_ID has changed during open */
1438                 /*
1439                  * FIXME: This check is not airtight, as the FCP channel does
1440                  * not monitor closures of target port connections caused on
1441                  * the remote side. Thus, they might miss out on invalidating
1442                  * locally cached WWPNs (and other N_Port parameters) of gone
1443                  * target ports. So, our heroic attempt to make things safe
1444                  * could be undermined by 'open port' response data tagged with
1445                  * obsolete WWPNs. Another reason to monitor potential
1446                  * connection closures ourself at least (by interpreting
1447                  * incoming ELS' and unsolicited status). It just crosses my
1448                  * mind that one should be able to cross-check by means of
1449                  * another GID_PN straight after a port has been opened.
1450                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1451                  */
1452                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1453                 if (req->qtcb->bottom.support.els1_length >=
1454                     FSF_PLOGI_MIN_LEN) {
1455                         if (plogi->serv_param.wwpn != port->wwpn)
1456                                 port->d_id = 0;
1457                         else {
1458                                 port->wwnn = plogi->serv_param.wwnn;
1459                                 zfcp_fc_plogi_evaluate(port, plogi);
1460                         }
1461                 }
1462                 break;
1463         case FSF_UNKNOWN_OP_SUBTYPE:
1464                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1465                 break;
1466         }
1467
1468 out:
1469         zfcp_port_put(port);
1470 }
1471
1472 /**
1473  * zfcp_fsf_open_port - create and send open port request
1474  * @erp_action: pointer to struct zfcp_erp_action
1475  * Returns: 0 on success, error otherwise
1476  */
1477 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1478 {
1479         struct qdio_buffer_element *sbale;
1480         struct zfcp_adapter *adapter = erp_action->adapter;
1481         struct zfcp_fsf_req *req;
1482         struct zfcp_port *port = erp_action->port;
1483         int retval = -EIO;
1484
1485         spin_lock_bh(&adapter->req_q_lock);
1486         if (zfcp_fsf_req_sbal_get(adapter))
1487                 goto out;
1488
1489         req = zfcp_fsf_req_create(adapter,
1490                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1491                                   ZFCP_REQ_AUTO_CLEANUP,
1492                                   adapter->pool.fsf_req_erp);
1493         if (IS_ERR(req)) {
1494                 retval = PTR_ERR(req);
1495                 goto out;
1496         }
1497
1498         sbale = zfcp_qdio_sbale_req(req);
1499         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1500         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1501
1502         req->handler = zfcp_fsf_open_port_handler;
1503         req->qtcb->bottom.support.d_id = port->d_id;
1504         req->data = port;
1505         req->erp_action = erp_action;
1506         erp_action->fsf_req = req;
1507         zfcp_port_get(port);
1508
1509         zfcp_fsf_start_erp_timer(req);
1510         retval = zfcp_fsf_req_send(req);
1511         if (retval) {
1512                 zfcp_fsf_req_free(req);
1513                 erp_action->fsf_req = NULL;
1514                 zfcp_port_put(port);
1515         }
1516 out:
1517         spin_unlock_bh(&adapter->req_q_lock);
1518         return retval;
1519 }
1520
1521 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1522 {
1523         struct zfcp_port *port = req->data;
1524
1525         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1526                 return;
1527
1528         switch (req->qtcb->header.fsf_status) {
1529         case FSF_PORT_HANDLE_NOT_VALID:
1530                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1", req);
1531                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1532                 break;
1533         case FSF_ADAPTER_STATUS_AVAILABLE:
1534                 break;
1535         case FSF_GOOD:
1536                 zfcp_erp_modify_port_status(port, "fscph_2", req,
1537                                             ZFCP_STATUS_COMMON_OPEN,
1538                                             ZFCP_CLEAR);
1539                 break;
1540         }
1541 }
1542
1543 /**
1544  * zfcp_fsf_close_port - create and send close port request
1545  * @erp_action: pointer to struct zfcp_erp_action
1546  * Returns: 0 on success, error otherwise
1547  */
1548 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1549 {
1550         struct qdio_buffer_element *sbale;
1551         struct zfcp_adapter *adapter = erp_action->adapter;
1552         struct zfcp_fsf_req *req;
1553         int retval = -EIO;
1554
1555         spin_lock_bh(&adapter->req_q_lock);
1556         if (zfcp_fsf_req_sbal_get(adapter))
1557                 goto out;
1558
1559         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1560                                   ZFCP_REQ_AUTO_CLEANUP,
1561                                   adapter->pool.fsf_req_erp);
1562         if (IS_ERR(req)) {
1563                 retval = PTR_ERR(req);
1564                 goto out;
1565         }
1566
1567         sbale = zfcp_qdio_sbale_req(req);
1568         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1569         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1570
1571         req->handler = zfcp_fsf_close_port_handler;
1572         req->data = erp_action->port;
1573         req->erp_action = erp_action;
1574         req->qtcb->header.port_handle = erp_action->port->handle;
1575         erp_action->fsf_req = req;
1576
1577         zfcp_fsf_start_erp_timer(req);
1578         retval = zfcp_fsf_req_send(req);
1579         if (retval) {
1580                 zfcp_fsf_req_free(req);
1581                 erp_action->fsf_req = NULL;
1582         }
1583 out:
1584         spin_unlock_bh(&adapter->req_q_lock);
1585         return retval;
1586 }
1587
1588 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1589 {
1590         struct zfcp_wka_port *wka_port = req->data;
1591         struct fsf_qtcb_header *header = &req->qtcb->header;
1592
1593         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1594                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1595                 goto out;
1596         }
1597
1598         switch (header->fsf_status) {
1599         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1600                 dev_warn(&req->adapter->ccw_device->dev,
1601                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1602                 /* fall through */
1603         case FSF_ADAPTER_STATUS_AVAILABLE:
1604                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1605                 /* fall through */
1606         case FSF_ACCESS_DENIED:
1607                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1608                 break;
1609         case FSF_PORT_ALREADY_OPEN:
1610                 break;
1611         case FSF_GOOD:
1612                 wka_port->handle = header->port_handle;
1613                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1614         }
1615 out:
1616         wake_up(&wka_port->completion_wq);
1617 }
1618
1619 /**
1620  * zfcp_fsf_open_wka_port - create and send open wka-port request
1621  * @wka_port: pointer to struct zfcp_wka_port
1622  * Returns: 0 on success, error otherwise
1623  */
1624 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1625 {
1626         struct qdio_buffer_element *sbale;
1627         struct zfcp_adapter *adapter = wka_port->adapter;
1628         struct zfcp_fsf_req *req;
1629         int retval = -EIO;
1630
1631         spin_lock_bh(&adapter->req_q_lock);
1632         if (zfcp_fsf_req_sbal_get(adapter))
1633                 goto out;
1634
1635         req = zfcp_fsf_req_create(adapter,
1636                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1637                                   ZFCP_REQ_AUTO_CLEANUP,
1638                                   adapter->pool.fsf_req_erp);
1639         if (unlikely(IS_ERR(req))) {
1640                 retval = PTR_ERR(req);
1641                 goto out;
1642         }
1643
1644         sbale = zfcp_qdio_sbale_req(req);
1645         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1646         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1647
1648         req->handler = zfcp_fsf_open_wka_port_handler;
1649         req->qtcb->bottom.support.d_id = wka_port->d_id;
1650         req->data = wka_port;
1651
1652         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1653         retval = zfcp_fsf_req_send(req);
1654         if (retval)
1655                 zfcp_fsf_req_free(req);
1656 out:
1657         spin_unlock_bh(&adapter->req_q_lock);
1658         return retval;
1659 }
1660
1661 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1662 {
1663         struct zfcp_wka_port *wka_port = req->data;
1664
1665         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1666                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1667                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1", req);
1668         }
1669
1670         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1671         wake_up(&wka_port->completion_wq);
1672 }
1673
1674 /**
1675  * zfcp_fsf_close_wka_port - create and send close wka port request
1676  * @erp_action: pointer to struct zfcp_erp_action
1677  * Returns: 0 on success, error otherwise
1678  */
1679 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1680 {
1681         struct qdio_buffer_element *sbale;
1682         struct zfcp_adapter *adapter = wka_port->adapter;
1683         struct zfcp_fsf_req *req;
1684         int retval = -EIO;
1685
1686         spin_lock_bh(&adapter->req_q_lock);
1687         if (zfcp_fsf_req_sbal_get(adapter))
1688                 goto out;
1689
1690         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1691                                   ZFCP_REQ_AUTO_CLEANUP,
1692                                   adapter->pool.fsf_req_erp);
1693         if (unlikely(IS_ERR(req))) {
1694                 retval = PTR_ERR(req);
1695                 goto out;
1696         }
1697
1698         sbale = zfcp_qdio_sbale_req(req);
1699         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1700         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1701
1702         req->handler = zfcp_fsf_close_wka_port_handler;
1703         req->data = wka_port;
1704         req->qtcb->header.port_handle = wka_port->handle;
1705
1706         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1707         retval = zfcp_fsf_req_send(req);
1708         if (retval)
1709                 zfcp_fsf_req_free(req);
1710 out:
1711         spin_unlock_bh(&adapter->req_q_lock);
1712         return retval;
1713 }
1714
1715 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1716 {
1717         struct zfcp_port *port = req->data;
1718         struct fsf_qtcb_header *header = &req->qtcb->header;
1719         struct zfcp_unit *unit;
1720
1721         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1722                 return;
1723
1724         switch (header->fsf_status) {
1725         case FSF_PORT_HANDLE_NOT_VALID:
1726                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1", req);
1727                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1728                 break;
1729         case FSF_ACCESS_DENIED:
1730                 zfcp_fsf_access_denied_port(req, port);
1731                 break;
1732         case FSF_PORT_BOXED:
1733                 zfcp_erp_port_boxed(port, "fscpph2", req);
1734                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1735                                ZFCP_STATUS_FSFREQ_RETRY;
1736                 /* can't use generic zfcp_erp_modify_port_status because
1737                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1738                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1739                 list_for_each_entry(unit, &port->unit_list_head, list)
1740                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1741                                           &unit->status);
1742                 break;
1743         case FSF_ADAPTER_STATUS_AVAILABLE:
1744                 switch (header->fsf_status_qual.word[0]) {
1745                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1746                         /* fall through */
1747                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1748                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1749                         break;
1750                 }
1751                 break;
1752         case FSF_GOOD:
1753                 /* can't use generic zfcp_erp_modify_port_status because
1754                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1755                  */
1756                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1757                 list_for_each_entry(unit, &port->unit_list_head, list)
1758                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1759                                           &unit->status);
1760                 break;
1761         }
1762 }
1763
1764 /**
1765  * zfcp_fsf_close_physical_port - close physical port
1766  * @erp_action: pointer to struct zfcp_erp_action
1767  * Returns: 0 on success
1768  */
1769 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1770 {
1771         struct qdio_buffer_element *sbale;
1772         struct zfcp_adapter *adapter = erp_action->adapter;
1773         struct zfcp_fsf_req *req;
1774         int retval = -EIO;
1775
1776         spin_lock_bh(&adapter->req_q_lock);
1777         if (zfcp_fsf_req_sbal_get(adapter))
1778                 goto out;
1779
1780         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1781                                   ZFCP_REQ_AUTO_CLEANUP,
1782                                   adapter->pool.fsf_req_erp);
1783         if (IS_ERR(req)) {
1784                 retval = PTR_ERR(req);
1785                 goto out;
1786         }
1787
1788         sbale = zfcp_qdio_sbale_req(req);
1789         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1790         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1791
1792         req->data = erp_action->port;
1793         req->qtcb->header.port_handle = erp_action->port->handle;
1794         req->erp_action = erp_action;
1795         req->handler = zfcp_fsf_close_physical_port_handler;
1796         erp_action->fsf_req = req;
1797
1798         zfcp_fsf_start_erp_timer(req);
1799         retval = zfcp_fsf_req_send(req);
1800         if (retval) {
1801                 zfcp_fsf_req_free(req);
1802                 erp_action->fsf_req = NULL;
1803         }
1804 out:
1805         spin_unlock_bh(&adapter->req_q_lock);
1806         return retval;
1807 }
1808
1809 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1810 {
1811         struct zfcp_adapter *adapter = req->adapter;
1812         struct zfcp_unit *unit = req->data;
1813         struct fsf_qtcb_header *header = &req->qtcb->header;
1814         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1815         struct fsf_queue_designator *queue_designator =
1816                                 &header->fsf_status_qual.fsf_queue_designator;
1817         int exclusive, readwrite;
1818
1819         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1820                 return;
1821
1822         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1823                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1824                           ZFCP_STATUS_UNIT_SHARED |
1825                           ZFCP_STATUS_UNIT_READONLY,
1826                           &unit->status);
1827
1828         switch (header->fsf_status) {
1829
1830         case FSF_PORT_HANDLE_NOT_VALID:
1831                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fsouh_1", req);
1832                 /* fall through */
1833         case FSF_LUN_ALREADY_OPEN:
1834                 break;
1835         case FSF_ACCESS_DENIED:
1836                 zfcp_fsf_access_denied_unit(req, unit);
1837                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1838                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1839                 break;
1840         case FSF_PORT_BOXED:
1841                 zfcp_erp_port_boxed(unit->port, "fsouh_2", req);
1842                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1843                                ZFCP_STATUS_FSFREQ_RETRY;
1844                 break;
1845         case FSF_LUN_SHARING_VIOLATION:
1846                 if (header->fsf_status_qual.word[0])
1847                         dev_warn(&adapter->ccw_device->dev,
1848                                  "LUN 0x%Lx on port 0x%Lx is already in "
1849                                  "use by CSS%d, MIF Image ID %x\n",
1850                                  (unsigned long long)unit->fcp_lun,
1851                                  (unsigned long long)unit->port->wwpn,
1852                                  queue_designator->cssid,
1853                                  queue_designator->hla);
1854                 else
1855                         zfcp_act_eval_err(adapter,
1856                                           header->fsf_status_qual.word[2]);
1857                 zfcp_erp_unit_access_denied(unit, "fsouh_3", req);
1858                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1859                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1860                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1861                 break;
1862         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1863                 dev_warn(&adapter->ccw_device->dev,
1864                          "No handle is available for LUN "
1865                          "0x%016Lx on port 0x%016Lx\n",
1866                          (unsigned long long)unit->fcp_lun,
1867                          (unsigned long long)unit->port->wwpn);
1868                 zfcp_erp_unit_failed(unit, "fsouh_4", req);
1869                 /* fall through */
1870         case FSF_INVALID_COMMAND_OPTION:
1871                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1872                 break;
1873         case FSF_ADAPTER_STATUS_AVAILABLE:
1874                 switch (header->fsf_status_qual.word[0]) {
1875                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1876                         zfcp_test_link(unit->port);
1877                         /* fall through */
1878                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1879                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1880                         break;
1881                 }
1882                 break;
1883
1884         case FSF_GOOD:
1885                 unit->handle = header->lun_handle;
1886                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1887
1888                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1889                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1890                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1891                         exclusive = (bottom->lun_access_info &
1892                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1893                         readwrite = (bottom->lun_access_info &
1894                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1895
1896                         if (!exclusive)
1897                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1898                                                 &unit->status);
1899
1900                         if (!readwrite) {
1901                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1902                                                 &unit->status);
1903                                 dev_info(&adapter->ccw_device->dev,
1904                                          "SCSI device at LUN 0x%016Lx on port "
1905                                          "0x%016Lx opened read-only\n",
1906                                          (unsigned long long)unit->fcp_lun,
1907                                          (unsigned long long)unit->port->wwpn);
1908                         }
1909
1910                         if (exclusive && !readwrite) {
1911                                 dev_err(&adapter->ccw_device->dev,
1912                                         "Exclusive read-only access not "
1913                                         "supported (unit 0x%016Lx, "
1914                                         "port 0x%016Lx)\n",
1915                                         (unsigned long long)unit->fcp_lun,
1916                                         (unsigned long long)unit->port->wwpn);
1917                                 zfcp_erp_unit_failed(unit, "fsouh_5", req);
1918                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1919                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_6", req);
1920                         } else if (!exclusive && readwrite) {
1921                                 dev_err(&adapter->ccw_device->dev,
1922                                         "Shared read-write access not "
1923                                         "supported (unit 0x%016Lx, port "
1924                                         "0x%016Lx)\n",
1925                                         (unsigned long long)unit->fcp_lun,
1926                                         (unsigned long long)unit->port->wwpn);
1927                                 zfcp_erp_unit_failed(unit, "fsouh_7", req);
1928                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1929                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_8", req);
1930                         }
1931                 }
1932                 break;
1933         }
1934 }
1935
1936 /**
1937  * zfcp_fsf_open_unit - open unit
1938  * @erp_action: pointer to struct zfcp_erp_action
1939  * Returns: 0 on success, error otherwise
1940  */
1941 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1942 {
1943         struct qdio_buffer_element *sbale;
1944         struct zfcp_adapter *adapter = erp_action->adapter;
1945         struct zfcp_fsf_req *req;
1946         int retval = -EIO;
1947
1948         spin_lock_bh(&adapter->req_q_lock);
1949         if (zfcp_fsf_req_sbal_get(adapter))
1950                 goto out;
1951
1952         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1953                                   ZFCP_REQ_AUTO_CLEANUP,
1954                                   adapter->pool.fsf_req_erp);
1955         if (IS_ERR(req)) {
1956                 retval = PTR_ERR(req);
1957                 goto out;
1958         }
1959
1960         sbale = zfcp_qdio_sbale_req(req);
1961         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1962         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1963
1964         req->qtcb->header.port_handle = erp_action->port->handle;
1965         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1966         req->handler = zfcp_fsf_open_unit_handler;
1967         req->data = erp_action->unit;
1968         req->erp_action = erp_action;
1969         erp_action->fsf_req = req;
1970
1971         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1972                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1973
1974         zfcp_fsf_start_erp_timer(req);
1975         retval = zfcp_fsf_req_send(req);
1976         if (retval) {
1977                 zfcp_fsf_req_free(req);
1978                 erp_action->fsf_req = NULL;
1979         }
1980 out:
1981         spin_unlock_bh(&adapter->req_q_lock);
1982         return retval;
1983 }
1984
1985 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1986 {
1987         struct zfcp_unit *unit = req->data;
1988
1989         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1990                 return;
1991
1992         switch (req->qtcb->header.fsf_status) {
1993         case FSF_PORT_HANDLE_NOT_VALID:
1994                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fscuh_1", req);
1995                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1996                 break;
1997         case FSF_LUN_HANDLE_NOT_VALID:
1998                 zfcp_erp_port_reopen(unit->port, 0, "fscuh_2", req);
1999                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2000                 break;
2001         case FSF_PORT_BOXED:
2002                 zfcp_erp_port_boxed(unit->port, "fscuh_3", req);
2003                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2004                                ZFCP_STATUS_FSFREQ_RETRY;
2005                 break;
2006         case FSF_ADAPTER_STATUS_AVAILABLE:
2007                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
2008                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2009                         zfcp_test_link(unit->port);
2010                         /* fall through */
2011                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2012                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2013                         break;
2014                 }
2015                 break;
2016         case FSF_GOOD:
2017                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2018                 break;
2019         }
2020 }
2021
2022 /**
2023  * zfcp_fsf_close_unit - close zfcp unit
2024  * @erp_action: pointer to struct zfcp_unit
2025  * Returns: 0 on success, error otherwise
2026  */
2027 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2028 {
2029         struct qdio_buffer_element *sbale;
2030         struct zfcp_adapter *adapter = erp_action->adapter;
2031         struct zfcp_fsf_req *req;
2032         int retval = -EIO;
2033
2034         spin_lock_bh(&adapter->req_q_lock);
2035         if (zfcp_fsf_req_sbal_get(adapter))
2036                 goto out;
2037         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2038                                   ZFCP_REQ_AUTO_CLEANUP,
2039                                   adapter->pool.fsf_req_erp);
2040         if (IS_ERR(req)) {
2041                 retval = PTR_ERR(req);
2042                 goto out;
2043         }
2044
2045         sbale = zfcp_qdio_sbale_req(req);
2046         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2047         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2048
2049         req->qtcb->header.port_handle = erp_action->port->handle;
2050         req->qtcb->header.lun_handle = erp_action->unit->handle;
2051         req->handler = zfcp_fsf_close_unit_handler;
2052         req->data = erp_action->unit;
2053         req->erp_action = erp_action;
2054         erp_action->fsf_req = req;
2055
2056         zfcp_fsf_start_erp_timer(req);
2057         retval = zfcp_fsf_req_send(req);
2058         if (retval) {
2059                 zfcp_fsf_req_free(req);
2060                 erp_action->fsf_req = NULL;
2061         }
2062 out:
2063         spin_unlock_bh(&adapter->req_q_lock);
2064         return retval;
2065 }
2066
2067 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2068 {
2069         lat_rec->sum += lat;
2070         lat_rec->min = min(lat_rec->min, lat);
2071         lat_rec->max = max(lat_rec->max, lat);
2072 }
2073
2074 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2075 {
2076         struct fsf_qual_latency_info *lat_inf;
2077         struct latency_cont *lat;
2078         struct zfcp_unit *unit = req->unit;
2079
2080         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2081
2082         switch (req->qtcb->bottom.io.data_direction) {
2083         case FSF_DATADIR_READ:
2084                 lat = &unit->latencies.read;
2085                 break;
2086         case FSF_DATADIR_WRITE:
2087                 lat = &unit->latencies.write;
2088                 break;
2089         case FSF_DATADIR_CMND:
2090                 lat = &unit->latencies.cmd;
2091                 break;
2092         default:
2093                 return;
2094         }
2095
2096         spin_lock(&unit->latencies.lock);
2097         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2098         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2099         lat->counter++;
2100         spin_unlock(&unit->latencies.lock);
2101 }
2102
2103 #ifdef CONFIG_BLK_DEV_IO_TRACE
2104 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2105 {
2106         struct fsf_qual_latency_info *lat_inf;
2107         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2108         struct request *req = scsi_cmnd->request;
2109         struct zfcp_blk_drv_data trace;
2110         int ticks = fsf_req->adapter->timer_ticks;
2111
2112         trace.flags = 0;
2113         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2114         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2115                 trace.flags |= ZFCP_BLK_LAT_VALID;
2116                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2117                 trace.channel_lat = lat_inf->channel_lat * ticks;
2118                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2119         }
2120         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2121                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2122         trace.inb_usage = fsf_req->qdio_inb_usage;
2123         trace.outb_usage = fsf_req->qdio_outb_usage;
2124
2125         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2126 }
2127 #else
2128 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2129 {
2130 }
2131 #endif
2132
2133 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2134 {
2135         struct scsi_cmnd *scpnt;
2136         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2137             &(req->qtcb->bottom.io.fcp_rsp);
2138         u32 sns_len;
2139         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2140         unsigned long flags;
2141
2142         read_lock_irqsave(&req->adapter->abort_lock, flags);
2143
2144         scpnt = req->data;
2145         if (unlikely(!scpnt)) {
2146                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2147                 return;
2148         }
2149
2150         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2151                 set_host_byte(scpnt, DID_SOFT_ERROR);
2152                 goto skip_fsfstatus;
2153         }
2154
2155         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2156                 set_host_byte(scpnt, DID_ERROR);
2157                 goto skip_fsfstatus;
2158         }
2159
2160         set_msg_byte(scpnt, COMMAND_COMPLETE);
2161
2162         scpnt->result |= fcp_rsp_iu->scsi_status;
2163
2164         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2165                 zfcp_fsf_req_latency(req);
2166
2167         zfcp_fsf_trace_latency(req);
2168
2169         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2170                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2171                         set_host_byte(scpnt, DID_OK);
2172                 else {
2173                         set_host_byte(scpnt, DID_ERROR);
2174                         goto skip_fsfstatus;
2175                 }
2176         }
2177
2178         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2179                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2180                           fcp_rsp_iu->fcp_rsp_len;
2181                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2182                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2183
2184                 memcpy(scpnt->sense_buffer,
2185                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2186         }
2187
2188         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2189                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2190                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2191                     scpnt->underflow)
2192                         set_host_byte(scpnt, DID_ERROR);
2193         }
2194 skip_fsfstatus:
2195         if (scpnt->result != 0)
2196                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2197         else if (scpnt->retries > 0)
2198                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2199         else
2200                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2201
2202         scpnt->host_scribble = NULL;
2203         (scpnt->scsi_done) (scpnt);
2204         /*
2205          * We must hold this lock until scsi_done has been called.
2206          * Otherwise we may call scsi_done after abort regarding this
2207          * command has completed.
2208          * Note: scsi_done must not block!
2209          */
2210         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2211 }
2212
2213 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2214 {
2215         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2216             &(req->qtcb->bottom.io.fcp_rsp);
2217         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2218
2219         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2220              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2221                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2222 }
2223
2224
2225 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2226 {
2227         struct zfcp_unit *unit;
2228         struct fsf_qtcb_header *header = &req->qtcb->header;
2229
2230         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2231                 unit = req->data;
2232         else
2233                 unit = req->unit;
2234
2235         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2236                 goto skip_fsfstatus;
2237
2238         switch (header->fsf_status) {
2239         case FSF_HANDLE_MISMATCH:
2240         case FSF_PORT_HANDLE_NOT_VALID:
2241                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fssfch1", req);
2242                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2243                 break;
2244         case FSF_FCPLUN_NOT_VALID:
2245         case FSF_LUN_HANDLE_NOT_VALID:
2246                 zfcp_erp_port_reopen(unit->port, 0, "fssfch2", req);
2247                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2248                 break;
2249         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2250                 zfcp_fsf_class_not_supp(req);
2251                 break;
2252         case FSF_ACCESS_DENIED:
2253                 zfcp_fsf_access_denied_unit(req, unit);
2254                 break;
2255         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2256                 dev_err(&req->adapter->ccw_device->dev,
2257                         "Incorrect direction %d, unit 0x%016Lx on port "
2258                         "0x%016Lx closed\n",
2259                         req->qtcb->bottom.io.data_direction,
2260                         (unsigned long long)unit->fcp_lun,
2261                         (unsigned long long)unit->port->wwpn);
2262                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch3",
2263                                           req);
2264                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2265                 break;
2266         case FSF_CMND_LENGTH_NOT_VALID:
2267                 dev_err(&req->adapter->ccw_device->dev,
2268                         "Incorrect CDB length %d, unit 0x%016Lx on "
2269                         "port 0x%016Lx closed\n",
2270                         req->qtcb->bottom.io.fcp_cmnd_length,
2271                         (unsigned long long)unit->fcp_lun,
2272                         (unsigned long long)unit->port->wwpn);
2273                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch4",
2274                                           req);
2275                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2276                 break;
2277         case FSF_PORT_BOXED:
2278                 zfcp_erp_port_boxed(unit->port, "fssfch5", req);
2279                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2280                                ZFCP_STATUS_FSFREQ_RETRY;
2281                 break;
2282         case FSF_LUN_BOXED:
2283                 zfcp_erp_unit_boxed(unit, "fssfch6", req);
2284                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2285                                ZFCP_STATUS_FSFREQ_RETRY;
2286                 break;
2287         case FSF_ADAPTER_STATUS_AVAILABLE:
2288                 if (header->fsf_status_qual.word[0] ==
2289                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2290                         zfcp_test_link(unit->port);
2291                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2292                 break;
2293         }
2294 skip_fsfstatus:
2295         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2296                 zfcp_fsf_send_fcp_ctm_handler(req);
2297         else {
2298                 zfcp_fsf_send_fcp_command_task_handler(req);
2299                 req->unit = NULL;
2300                 zfcp_unit_put(unit);
2301         }
2302 }
2303
2304 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2305 {
2306         u32 *fcp_dl_ptr;
2307
2308         /*
2309          * fcp_dl_addr = start address of fcp_cmnd structure +
2310          * size of fixed part + size of dynamically sized add_dcp_cdb field
2311          * SEE FCP-2 documentation
2312          */
2313         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2314                         (fcp_cmd->add_fcp_cdb_length << 2));
2315         *fcp_dl_ptr = fcp_dl;
2316 }
2317
2318 /**
2319  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2320  * @unit: unit where command is sent to
2321  * @scsi_cmnd: scsi command to be sent
2322  */
2323 int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
2324                                    struct scsi_cmnd *scsi_cmnd)
2325 {
2326         struct zfcp_fsf_req *req;
2327         struct fcp_cmnd_iu *fcp_cmnd_iu;
2328         unsigned int sbtype = SBAL_FLAGS0_TYPE_READ;
2329         int real_bytes, retval = -EIO;
2330         struct zfcp_adapter *adapter = unit->port->adapter;
2331
2332         if (unlikely(!(atomic_read(&unit->status) &
2333                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2334                 return -EBUSY;
2335
2336         spin_lock(&adapter->req_q_lock);
2337         if (atomic_read(&adapter->req_q.count) <= 0) {
2338                 atomic_inc(&adapter->qdio_outb_full);
2339                 goto out;
2340         }
2341         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND,
2342                                   ZFCP_REQ_AUTO_CLEANUP,
2343                                   adapter->pool.fsf_req_scsi);
2344         if (IS_ERR(req)) {
2345                 retval = PTR_ERR(req);
2346                 goto out;
2347         }
2348
2349         zfcp_unit_get(unit);
2350         req->unit = unit;
2351         req->data = scsi_cmnd;
2352         req->handler = zfcp_fsf_send_fcp_command_handler;
2353         req->qtcb->header.lun_handle = unit->handle;
2354         req->qtcb->header.port_handle = unit->port->handle;
2355         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2356
2357         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2358
2359         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2360         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2361         /*
2362          * set depending on data direction:
2363          *      data direction bits in SBALE (SB Type)
2364          *      data direction bits in QTCB
2365          *      data direction bits in FCP_CMND IU
2366          */
2367         switch (scsi_cmnd->sc_data_direction) {
2368         case DMA_NONE:
2369                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2370                 break;
2371         case DMA_FROM_DEVICE:
2372                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2373                 fcp_cmnd_iu->rddata = 1;
2374                 break;
2375         case DMA_TO_DEVICE:
2376                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2377                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2378                 fcp_cmnd_iu->wddata = 1;
2379                 break;
2380         case DMA_BIDIRECTIONAL:
2381                 goto failed_scsi_cmnd;
2382         }
2383
2384         if (likely((scsi_cmnd->device->simple_tags) ||
2385                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2386                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2387                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2388         else
2389                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2390
2391         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2392                 fcp_cmnd_iu->add_fcp_cdb_length =
2393                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2394
2395         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2396
2397         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2398                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2399
2400         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2401                                              scsi_sglist(scsi_cmnd),
2402                                              FSF_MAX_SBALS_PER_REQ);
2403         if (unlikely(real_bytes < 0)) {
2404                 if (req->sbal_number >= FSF_MAX_SBALS_PER_REQ) {
2405                         dev_err(&adapter->ccw_device->dev,
2406                                 "Oversize data package, unit 0x%016Lx "
2407                                 "on port 0x%016Lx closed\n",
2408                                 (unsigned long long)unit->fcp_lun,
2409                                 (unsigned long long)unit->port->wwpn);
2410                         zfcp_erp_unit_shutdown(unit, 0, "fssfct1", req);
2411                         retval = -EINVAL;
2412                 }
2413                 goto failed_scsi_cmnd;
2414         }
2415
2416         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2417
2418         retval = zfcp_fsf_req_send(req);
2419         if (unlikely(retval))
2420                 goto failed_scsi_cmnd;
2421
2422         goto out;
2423
2424 failed_scsi_cmnd:
2425         zfcp_unit_put(unit);
2426         zfcp_fsf_req_free(req);
2427         scsi_cmnd->host_scribble = NULL;
2428 out:
2429         spin_unlock(&adapter->req_q_lock);
2430         return retval;
2431 }
2432
2433 /**
2434  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2435  * @unit: pointer to struct zfcp_unit
2436  * @tm_flags: unsigned byte for task management flags
2437  * Returns: on success pointer to struct fsf_req, NULL otherwise
2438  */
2439 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
2440 {
2441         struct qdio_buffer_element *sbale;
2442         struct zfcp_fsf_req *req = NULL;
2443         struct fcp_cmnd_iu *fcp_cmnd_iu;
2444         struct zfcp_adapter *adapter = unit->port->adapter;
2445
2446         if (unlikely(!(atomic_read(&unit->status) &
2447                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2448                 return NULL;
2449
2450         spin_lock_bh(&adapter->req_q_lock);
2451         if (zfcp_fsf_req_sbal_get(adapter))
2452                 goto out;
2453         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, 0,
2454                                   adapter->pool.fsf_req_scsi);
2455         if (IS_ERR(req)) {
2456                 req = NULL;
2457                 goto out;
2458         }
2459
2460         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2461         req->data = unit;
2462         req->handler = zfcp_fsf_send_fcp_command_handler;
2463         req->qtcb->header.lun_handle = unit->handle;
2464         req->qtcb->header.port_handle = unit->port->handle;
2465         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2466         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2467         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2468                                                 sizeof(u32);
2469
2470         sbale = zfcp_qdio_sbale_req(req);
2471         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2472         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2473
2474         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2475         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2476         fcp_cmnd_iu->task_management_flags = tm_flags;
2477
2478         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2479         if (!zfcp_fsf_req_send(req))
2480                 goto out;
2481
2482         zfcp_fsf_req_free(req);
2483         req = NULL;
2484 out:
2485         spin_unlock_bh(&adapter->req_q_lock);
2486         return req;
2487 }
2488
2489 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2490 {
2491 }
2492
2493 /**
2494  * zfcp_fsf_control_file - control file upload/download
2495  * @adapter: pointer to struct zfcp_adapter
2496  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2497  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2498  */
2499 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2500                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2501 {
2502         struct qdio_buffer_element *sbale;
2503         struct zfcp_fsf_req *req = NULL;
2504         struct fsf_qtcb_bottom_support *bottom;
2505         int direction, retval = -EIO, bytes;
2506
2507         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2508                 return ERR_PTR(-EOPNOTSUPP);
2509
2510         switch (fsf_cfdc->command) {
2511         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2512                 direction = SBAL_FLAGS0_TYPE_WRITE;
2513                 break;
2514         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2515                 direction = SBAL_FLAGS0_TYPE_READ;
2516                 break;
2517         default:
2518                 return ERR_PTR(-EINVAL);
2519         }
2520
2521         spin_lock_bh(&adapter->req_q_lock);
2522         if (zfcp_fsf_req_sbal_get(adapter))
2523                 goto out;
2524
2525         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2526         if (IS_ERR(req)) {
2527                 retval = -EPERM;
2528                 goto out;
2529         }
2530
2531         req->handler = zfcp_fsf_control_file_handler;
2532
2533         sbale = zfcp_qdio_sbale_req(req);
2534         sbale[0].flags |= direction;
2535
2536         bottom = &req->qtcb->bottom.support;
2537         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2538         bottom->option = fsf_cfdc->option;
2539
2540         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2541                                         FSF_MAX_SBALS_PER_REQ);
2542         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2543                 retval = -ENOMEM;
2544                 zfcp_fsf_req_free(req);
2545                 goto out;
2546         }
2547
2548         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2549         retval = zfcp_fsf_req_send(req);
2550 out:
2551         spin_unlock_bh(&adapter->req_q_lock);
2552
2553         if (!retval) {
2554                 wait_event(req->completion_wq,
2555                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2556                 return req;
2557         }
2558         return ERR_PTR(retval);
2559 }