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, 2008
   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 static void zfcp_fsf_request_timeout_handler(unsigned long data)
  16 {
  17         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
  18         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 62,
  19                                 NULL);
  20 }
  21
  22 static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
  23                                  unsigned long timeout)
  24 {
  25         fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
  26         fsf_req->timer.data = (unsigned long) fsf_req->adapter;
  27         fsf_req->timer.expires = jiffies + timeout;
  28         add_timer(&fsf_req->timer);
  29 }
  30
  31 static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
  32 {
  33         BUG_ON(!fsf_req->erp_action);
  34         fsf_req->timer.function = zfcp_erp_timeout_handler;
  35         fsf_req->timer.data = (unsigned long) fsf_req->erp_action;
  36         fsf_req->timer.expires = jiffies + 30 * HZ;
  37         add_timer(&fsf_req->timer);
  38 }
  39
  40 /* association between FSF command and FSF QTCB type */
  41 static u32 fsf_qtcb_type[] = {
  42         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  43         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  44         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  45         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  46         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  47         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  48         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  49         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  50         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  51         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  52         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  53         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  54         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  55 };
  56
  57 static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
  58 {
  59         u16 subtable = table >> 16;
  60         u16 rule = table & 0xffff;
  61         const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };
  62
  63         if (subtable && subtable < ARRAY_SIZE(act_type))
  64                 dev_warn(&adapter->ccw_device->dev,
  65                          "Access denied according to ACT rule type %s, "
  66                          "rule %d\n", act_type[subtable], rule);
  67 }
  68
  69 static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
  70                                         struct zfcp_port *port)
  71 {
  72         struct fsf_qtcb_header *header = &req->qtcb->header;
  73         dev_warn(&req->adapter->ccw_device->dev,
  74                  "Access denied to port 0x%016Lx\n",
  75                  (unsigned long long)port->wwpn);
  76         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  77         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  78         zfcp_erp_port_access_denied(port, 55, req);
  79         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  80 }
  81
  82 static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
  83                                         struct zfcp_unit *unit)
  84 {
  85         struct fsf_qtcb_header *header = &req->qtcb->header;
  86         dev_warn(&req->adapter->ccw_device->dev,
  87                  "Access denied to unit 0x%016Lx on port 0x%016Lx\n",
  88                  (unsigned long long)unit->fcp_lun,
  89                  (unsigned long long)unit->port->wwpn);
  90         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  91         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  92         zfcp_erp_unit_access_denied(unit, 59, req);
  93         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  94 }
  95
  96 static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
  97 {
  98         dev_err(&req->adapter->ccw_device->dev, "FCP device not "
  99                 "operational because of an unsupported FC class\n");
 100         zfcp_erp_adapter_shutdown(req->adapter, 0, 123, req);
 101         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 102 }
 103
 104 /**
 105  * zfcp_fsf_req_free - free memory used by fsf request
 106  * @fsf_req: pointer to struct zfcp_fsf_req
 107  */
 108 void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
 109 {
 110         if (likely(req->pool)) {
 111                 mempool_free(req, req->pool);
 112                 return;
 113         }
 114
 115         if (req->qtcb) {
 116                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, req);
 117                 return;
 118         }
 119 }
 120
 121 /**
 122  * zfcp_fsf_req_dismiss_all - dismiss all fsf requests
 123  * @adapter: pointer to struct zfcp_adapter
 124  *
 125  * Never ever call this without shutting down the adapter first.
 126  * Otherwise the adapter would continue using and corrupting s390 storage.
 127  * Included BUG_ON() call to ensure this is done.
 128  * ERP is supposed to be the only user of this function.
 129  */
 130 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 131 {
 132         struct zfcp_fsf_req *req, *tmp;
 133         unsigned long flags;
 134         LIST_HEAD(remove_queue);
 135         unsigned int i;
 136
 137         BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
 138         spin_lock_irqsave(&adapter->req_list_lock, flags);
 139         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 140                 list_splice_init(&adapter->req_list[i], &remove_queue);
 141         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 142
 143         list_for_each_entry_safe(req, tmp, &remove_queue, list) {
 144                 list_del(&req->list);
 145                 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 146                 zfcp_fsf_req_complete(req);
 147         }
 148 }
 149
 150 static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
 151 {
 152         struct fsf_status_read_buffer *sr_buf = req->data;
 153         struct zfcp_adapter *adapter = req->adapter;
 154         struct zfcp_port *port;
 155         int d_id = sr_buf->d_id & ZFCP_DID_MASK;
 156         unsigned long flags;
 157
 158         read_lock_irqsave(&zfcp_data.config_lock, flags);
 159         list_for_each_entry(port, &adapter->port_list_head, list)
 160                 if (port->d_id == d_id) {
 161                         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 162                         switch (sr_buf->status_subtype) {
 163                         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 164                                 zfcp_erp_port_reopen(port, 0, 101, req);
 165                                 break;
 166                         case FSF_STATUS_READ_SUB_ERROR_PORT:
 167                                 zfcp_erp_port_shutdown(port, 0, 122, req);
 168                                 break;
 169                         }
 170                         return;
 171                 }
 172         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 173 }
 174
 175 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, u8 id,
 176                                          struct fsf_link_down_info *link_down)
 177 {
 178         struct zfcp_adapter *adapter = req->adapter;
 179
 180         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 181                 return;
 182
 183         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 184
 185         if (!link_down)
 186                 goto out;
 187
 188         switch (link_down->error_code) {
 189         case FSF_PSQ_LINK_NO_LIGHT:
 190                 dev_warn(&req->adapter->ccw_device->dev,
 191                          "There is no light signal from the local "
 192                          "fibre channel cable\n");
 193                 break;
 194         case FSF_PSQ_LINK_WRAP_PLUG:
 195                 dev_warn(&req->adapter->ccw_device->dev,
 196                          "There is a wrap plug instead of a fibre "
 197                          "channel cable\n");
 198                 break;
 199         case FSF_PSQ_LINK_NO_FCP:
 200                 dev_warn(&req->adapter->ccw_device->dev,
 201                          "The adjacent fibre channel node does not "
 202                          "support FCP\n");
 203                 break;
 204         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 205                 dev_warn(&req->adapter->ccw_device->dev,
 206                          "The FCP device is suspended because of a "
 207                          "firmware update\n");
 208                 break;
 209         case FSF_PSQ_LINK_INVALID_WWPN:
 210                 dev_warn(&req->adapter->ccw_device->dev,
 211                          "The FCP device detected a WWPN that is "
 212                          "duplicate or not valid\n");
 213                 break;
 214         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 215                 dev_warn(&req->adapter->ccw_device->dev,
 216                          "The fibre channel fabric does not support NPIV\n");
 217                 break;
 218         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 219                 dev_warn(&req->adapter->ccw_device->dev,
 220                          "The FCP adapter cannot support more NPIV ports\n");
 221                 break;
 222         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 223                 dev_warn(&req->adapter->ccw_device->dev,
 224                          "The adjacent switch cannot support "
 225                          "more NPIV ports\n");
 226                 break;
 227         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 228                 dev_warn(&req->adapter->ccw_device->dev,
 229                          "The FCP adapter could not log in to the "
 230                          "fibre channel fabric\n");
 231                 break;
 232         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 233                 dev_warn(&req->adapter->ccw_device->dev,
 234                          "The WWPN assignment file on the FCP adapter "
 235                          "has been damaged\n");
 236                 break;
 237         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 238                 dev_warn(&req->adapter->ccw_device->dev,
 239                          "The mode table on the FCP adapter "
 240                          "has been damaged\n");
 241                 break;
 242         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 243                 dev_warn(&req->adapter->ccw_device->dev,
 244                          "All NPIV ports on the FCP adapter have "
 245                          "been assigned\n");
 246                 break;
 247         default:
 248                 dev_warn(&req->adapter->ccw_device->dev,
 249                          "The link between the FCP adapter and "
 250                          "the FC fabric is down\n");
 251         }
 252 out:
 253         zfcp_erp_adapter_failed(adapter, id, req);
 254 }
 255
 256 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 257 {
 258         struct fsf_status_read_buffer *sr_buf = req->data;
 259         struct fsf_link_down_info *ldi =
 260                 (struct fsf_link_down_info *) &sr_buf->payload;
 261
 262         switch (sr_buf->status_subtype) {
 263         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 264                 zfcp_fsf_link_down_info_eval(req, 38, ldi);
 265                 break;
 266         case FSF_STATUS_READ_SUB_FDISC_FAILED:
 267                 zfcp_fsf_link_down_info_eval(req, 39, ldi);
 268                 break;
 269         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 270                 zfcp_fsf_link_down_info_eval(req, 40, NULL);
 271         };
 272 }
 273
 274 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 275 {
 276         struct zfcp_adapter *adapter = req->adapter;
 277         struct fsf_status_read_buffer *sr_buf = req->data;
 278
 279         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 280                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, sr_buf);
 281                 mempool_free(sr_buf, adapter->pool.data_status_read);
 282                 zfcp_fsf_req_free(req);
 283                 return;
 284         }
 285
 286         zfcp_hba_dbf_event_fsf_unsol("read", adapter, sr_buf);
 287
 288         switch (sr_buf->status_type) {
 289         case FSF_STATUS_READ_PORT_CLOSED:
 290                 zfcp_fsf_status_read_port_closed(req);
 291                 break;
 292         case FSF_STATUS_READ_INCOMING_ELS:
 293                 zfcp_fc_incoming_els(req);
 294                 break;
 295         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 296                 break;
 297         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 298                 dev_warn(&adapter->ccw_device->dev,
 299                          "The error threshold for checksum statistics "
 300                          "has been exceeded\n");
 301                 zfcp_hba_dbf_event_berr(adapter, req);
 302                 break;
 303         case FSF_STATUS_READ_LINK_DOWN:
 304                 zfcp_fsf_status_read_link_down(req);
 305                 break;
 306         case FSF_STATUS_READ_LINK_UP:
 307                 dev_info(&adapter->ccw_device->dev,
 308                          "The local link has been restored\n");
 309                 /* All ports should be marked as ready to run again */
 310                 zfcp_erp_modify_adapter_status(adapter, 30, NULL,
 311                                                ZFCP_STATUS_COMMON_RUNNING,
 312                                                ZFCP_SET);
 313                 zfcp_erp_adapter_reopen(adapter,
 314                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 315                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 316                                         102, req);
 317                 break;
 318         case FSF_STATUS_READ_NOTIFICATION_LOST:
 319                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
 320                         zfcp_erp_adapter_access_changed(adapter, 135, req);
 321                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
 322                         schedule_work(&adapter->scan_work);
 323                 break;
 324         case FSF_STATUS_READ_CFDC_UPDATED:
 325                 zfcp_erp_adapter_access_changed(adapter, 136, req);
 326                 break;
 327         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 328                 adapter->adapter_features = sr_buf->payload.word[0];
 329                 break;
 330         }
 331
 332         mempool_free(sr_buf, adapter->pool.data_status_read);
 333         zfcp_fsf_req_free(req);
 334
 335         atomic_inc(&adapter->stat_miss);
 336         queue_work(zfcp_data.work_queue, &adapter->stat_work);
 337 }
 338
 339 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 340 {
 341         switch (req->qtcb->header.fsf_status_qual.word[0]) {
 342         case FSF_SQ_FCP_RSP_AVAILABLE:
 343         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 344         case FSF_SQ_NO_RETRY_POSSIBLE:
 345         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 346                 return;
 347         case FSF_SQ_COMMAND_ABORTED:
 348                 req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 349                 break;
 350         case FSF_SQ_NO_RECOM:
 351                 dev_err(&req->adapter->ccw_device->dev,
 352                         "The FCP adapter reported a problem "
 353                         "that cannot be recovered\n");
 354                 zfcp_erp_adapter_shutdown(req->adapter, 0, 121, req);
 355                 break;
 356         }
 357         /* all non-return stats set FSFREQ_ERROR*/
 358         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 359 }
 360
 361 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 362 {
 363         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 364                 return;
 365
 366         switch (req->qtcb->header.fsf_status) {
 367         case FSF_UNKNOWN_COMMAND:
 368                 dev_err(&req->adapter->ccw_device->dev,
 369                         "The FCP adapter does not recognize the command 0x%x\n",
 370                         req->qtcb->header.fsf_command);
 371                 zfcp_erp_adapter_shutdown(req->adapter, 0, 120, req);
 372                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 373                 break;
 374         case FSF_ADAPTER_STATUS_AVAILABLE:
 375                 zfcp_fsf_fsfstatus_qual_eval(req);
 376                 break;
 377         }
 378 }
 379
 380 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 381 {
 382         struct zfcp_adapter *adapter = req->adapter;
 383         struct fsf_qtcb *qtcb = req->qtcb;
 384         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 385
 386         zfcp_hba_dbf_event_fsf_response(req);
 387
 388         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 389                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 390                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 391                 return;
 392         }
 393
 394         switch (qtcb->prefix.prot_status) {
 395         case FSF_PROT_GOOD:
 396         case FSF_PROT_FSF_STATUS_PRESENTED:
 397                 return;
 398         case FSF_PROT_QTCB_VERSION_ERROR:
 399                 dev_err(&adapter->ccw_device->dev,
 400                         "QTCB version 0x%x not supported by FCP adapter "
 401                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
 402                         psq->word[0], psq->word[1]);
 403                 zfcp_erp_adapter_shutdown(adapter, 0, 117, req);
 404                 break;
 405         case FSF_PROT_ERROR_STATE:
 406         case FSF_PROT_SEQ_NUMB_ERROR:
 407                 zfcp_erp_adapter_reopen(adapter, 0, 98, req);
 408                 req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 409                 break;
 410         case FSF_PROT_UNSUPP_QTCB_TYPE:
 411                 dev_err(&adapter->ccw_device->dev,
 412                         "The QTCB type is not supported by the FCP adapter\n");
 413                 zfcp_erp_adapter_shutdown(adapter, 0, 118, req);
 414                 break;
 415         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 416                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 417                                 &adapter->status);
 418                 break;
 419         case FSF_PROT_DUPLICATE_REQUEST_ID:
 420                 dev_err(&adapter->ccw_device->dev,
 421                         "0x%Lx is an ambiguous request identifier\n",
 422                         (unsigned long long)qtcb->bottom.support.req_handle);
 423                 zfcp_erp_adapter_shutdown(adapter, 0, 78, req);
 424                 break;
 425         case FSF_PROT_LINK_DOWN:
 426                 zfcp_fsf_link_down_info_eval(req, 37, &psq->link_down_info);
 427                 /* FIXME: reopening adapter now? better wait for link up */
 428                 zfcp_erp_adapter_reopen(adapter, 0, 79, req);
 429                 break;
 430         case FSF_PROT_REEST_QUEUE:
 431                 /* All ports should be marked as ready to run again */
 432                 zfcp_erp_modify_adapter_status(adapter, 28, NULL,
 433                                                ZFCP_STATUS_COMMON_RUNNING,
 434                                                ZFCP_SET);
 435                 zfcp_erp_adapter_reopen(adapter,
 436                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 437                                         ZFCP_STATUS_COMMON_ERP_FAILED, 99, req);
 438                 break;
 439         default:
 440                 dev_err(&adapter->ccw_device->dev,
 441                         "0x%x is not a valid transfer protocol status\n",
 442                         qtcb->prefix.prot_status);
 443                 zfcp_erp_adapter_shutdown(adapter, 0, 119, req);
 444         }
 445         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 446 }
 447
 448 /**
 449  * zfcp_fsf_req_complete - process completion of a FSF request
 450  * @fsf_req: The FSF request that has been completed.
 451  *
 452  * When a request has been completed either from the FCP adapter,
 453  * or it has been dismissed due to a queue shutdown, this function
 454  * is called to process the completion status and trigger further
 455  * events related to the FSF request.
 456  */
 457 void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 458 {
 459         if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 460                 zfcp_fsf_status_read_handler(req);
 461                 return;
 462         }
 463
 464         del_timer(&req->timer);
 465         zfcp_fsf_protstatus_eval(req);
 466         zfcp_fsf_fsfstatus_eval(req);
 467         req->handler(req);
 468
 469         if (req->erp_action)
 470                 zfcp_erp_notify(req->erp_action, 0);
 471         req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 472
 473         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 474                 zfcp_fsf_req_free(req);
 475         else
 476         /* notify initiator waiting for the requests completion */
 477         /*
 478          * FIXME: Race! We must not access fsf_req here as it might have been
 479          * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 480          * flag. It's an improbable case. But, we have the same paranoia for
 481          * the cleanup flag already.
 482          * Might better be handled using complete()?
 483          * (setting the flag and doing wakeup ought to be atomic
 484          *  with regard to checking the flag as long as waitqueue is
 485          *  part of the to be released structure)
 486          */
 487                 wake_up(&req->completion_wq);
 488 }
 489
 490 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 491 {
 492         struct fsf_qtcb_bottom_config *bottom;
 493         struct zfcp_adapter *adapter = req->adapter;
 494         struct Scsi_Host *shost = adapter->scsi_host;
 495
 496         bottom = &req->qtcb->bottom.config;
 497
 498         if (req->data)
 499                 memcpy(req->data, bottom, sizeof(*bottom));
 500
 501         fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
 502         fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
 503         fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
 504         fc_host_speed(shost) = bottom->fc_link_speed;
 505         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 506
 507         adapter->hydra_version = bottom->adapter_type;
 508         adapter->timer_ticks = bottom->timer_interval;
 509
 510         if (fc_host_permanent_port_name(shost) == -1)
 511                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 512
 513         switch (bottom->fc_topology) {
 514         case FSF_TOPO_P2P:
 515                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
 516                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
 517                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
 518                 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
 519                 break;
 520         case FSF_TOPO_FABRIC:
 521                 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
 522                 break;
 523         case FSF_TOPO_AL:
 524                 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
 525         default:
 526                 dev_err(&adapter->ccw_device->dev,
 527                         "Unknown or unsupported arbitrated loop "
 528                         "fibre channel topology detected\n");
 529                 zfcp_erp_adapter_shutdown(adapter, 0, 127, req);
 530                 return -EIO;
 531         }
 532
 533         return 0;
 534 }
 535
 536 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 537 {
 538         struct zfcp_adapter *adapter = req->adapter;
 539         struct fsf_qtcb *qtcb = req->qtcb;
 540         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 541         struct Scsi_Host *shost = adapter->scsi_host;
 542
 543         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 544                 return;
 545
 546         adapter->fsf_lic_version = bottom->lic_version;
 547         adapter->adapter_features = bottom->adapter_features;
 548         adapter->connection_features = bottom->connection_features;
 549         adapter->peer_wwpn = 0;
 550         adapter->peer_wwnn = 0;
 551         adapter->peer_d_id = 0;
 552
 553         switch (qtcb->header.fsf_status) {
 554         case FSF_GOOD:
 555                 if (zfcp_fsf_exchange_config_evaluate(req))
 556                         return;
 557
 558                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 559                         dev_err(&adapter->ccw_device->dev,
 560                                 "FCP adapter maximum QTCB size (%d bytes) "
 561                                 "is too small\n",
 562                                 bottom->max_qtcb_size);
 563                         zfcp_erp_adapter_shutdown(adapter, 0, 129, req);
 564                         return;
 565                 }
 566                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 567                                 &adapter->status);
 568                 break;
 569         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 570                 fc_host_node_name(shost) = 0;
 571                 fc_host_port_name(shost) = 0;
 572                 fc_host_port_id(shost) = 0;
 573                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 574                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 575                 adapter->hydra_version = 0;
 576
 577                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 578                                 &adapter->status);
 579
 580                 zfcp_fsf_link_down_info_eval(req, 42,
 581                         &qtcb->header.fsf_status_qual.link_down_info);
 582                 break;
 583         default:
 584                 zfcp_erp_adapter_shutdown(adapter, 0, 130, req);
 585                 return;
 586         }
 587
 588         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 589                 adapter->hardware_version = bottom->hardware_version;
 590                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
 591                        min(FC_SERIAL_NUMBER_SIZE, 17));
 592                 EBCASC(fc_host_serial_number(shost),
 593                        min(FC_SERIAL_NUMBER_SIZE, 17));
 594         }
 595
 596         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 597                 dev_err(&adapter->ccw_device->dev,
 598                         "The FCP adapter only supports newer "
 599                         "control block versions\n");
 600                 zfcp_erp_adapter_shutdown(adapter, 0, 125, req);
 601                 return;
 602         }
 603         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 604                 dev_err(&adapter->ccw_device->dev,
 605                         "The FCP adapter only supports older "
 606                         "control block versions\n");
 607                 zfcp_erp_adapter_shutdown(adapter, 0, 126, req);
 608         }
 609 }
 610
 611 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 612 {
 613         struct zfcp_adapter *adapter = req->adapter;
 614         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 615         struct Scsi_Host *shost = adapter->scsi_host;
 616
 617         if (req->data)
 618                 memcpy(req->data, bottom, sizeof(*bottom));
 619
 620         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 621                 fc_host_permanent_port_name(shost) = bottom->wwpn;
 622         else
 623                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 624         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 625         fc_host_supported_speeds(shost) = bottom->supported_speed;
 626 }
 627
 628 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 629 {
 630         struct fsf_qtcb *qtcb = req->qtcb;
 631
 632         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 633                 return;
 634
 635         switch (qtcb->header.fsf_status) {
 636         case FSF_GOOD:
 637                 zfcp_fsf_exchange_port_evaluate(req);
 638                 break;
 639         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 640                 zfcp_fsf_exchange_port_evaluate(req);
 641                 zfcp_fsf_link_down_info_eval(req, 43,
 642                         &qtcb->header.fsf_status_qual.link_down_info);
 643                 break;
 644         }
 645 }
 646
 647 static int zfcp_fsf_sbal_check(struct zfcp_adapter *adapter)
 648 {
 649         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 650
 651         spin_lock_bh(&adapter->req_q_lock);
 652         if (atomic_read(&req_q->count))
 653                 return 1;
 654         spin_unlock_bh(&adapter->req_q_lock);
 655         return 0;
 656 }
 657
 658 static int zfcp_fsf_sbal_available(struct zfcp_adapter *adapter)
 659 {
 660         unsigned int count = atomic_read(&adapter->req_q.count);
 661         if (!count)
 662                 atomic_inc(&adapter->qdio_outb_full);
 663         return count > 0;
 664 }
 665
 666 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 667 {
 668         long ret;
 669
 670         spin_unlock_bh(&adapter->req_q_lock);
 671         ret = wait_event_interruptible_timeout(adapter->request_wq,
 672                                         zfcp_fsf_sbal_check(adapter), 5 * HZ);
 673         if (ret > 0)
 674                 return 0;
 675         if (!ret)
 676                 atomic_inc(&adapter->qdio_outb_full);
 677
 678         spin_lock_bh(&adapter->req_q_lock);
 679         return -EIO;
 680 }
 681
 682 static struct zfcp_fsf_req *zfcp_fsf_alloc_noqtcb(mempool_t *pool)
 683 {
 684         struct zfcp_fsf_req *req;
 685         req = mempool_alloc(pool, GFP_ATOMIC);
 686         if (!req)
 687                 return NULL;
 688         memset(req, 0, sizeof(*req));
 689         req->pool = pool;
 690         return req;
 691 }
 692
 693 static struct zfcp_fsf_req *zfcp_fsf_alloc_qtcb(mempool_t *pool)
 694 {
 695         struct zfcp_fsf_req_qtcb *qtcb;
 696
 697         if (likely(pool))
 698                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
 699         else
 700                 qtcb = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 701                                         GFP_ATOMIC);
 702         if (unlikely(!qtcb))
 703                 return NULL;
 704
 705         memset(qtcb, 0, sizeof(*qtcb));
 706         qtcb->fsf_req.qtcb = &qtcb->qtcb;
 707         qtcb->fsf_req.pool = pool;
 708
 709         return &qtcb->fsf_req;
 710 }
 711
 712 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
 713                                                 u32 fsf_cmd, int req_flags,
 714                                                 mempool_t *pool)
 715 {
 716         struct qdio_buffer_element *sbale;
 717
 718         struct zfcp_fsf_req *req;
 719         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 720
 721         if (req_flags & ZFCP_REQ_NO_QTCB)
 722                 req = zfcp_fsf_alloc_noqtcb(pool);
 723         else
 724                 req = zfcp_fsf_alloc_qtcb(pool);
 725
 726         if (unlikely(!req))
 727                 return ERR_PTR(-EIO);
 728
 729         if (adapter->req_no == 0)
 730                 adapter->req_no++;
 731
 732         INIT_LIST_HEAD(&req->list);
 733         init_timer(&req->timer);
 734         init_waitqueue_head(&req->completion_wq);
 735
 736         req->adapter = adapter;
 737         req->fsf_command = fsf_cmd;
 738         req->req_id = adapter->req_no++;
 739         req->sbal_number = 1;
 740         req->sbal_first = req_q->first;
 741         req->sbal_last = req_q->first;
 742         req->sbale_curr = 1;
 743
 744         sbale = zfcp_qdio_sbale_req(req);
 745         sbale[0].addr = (void *) req->req_id;
 746         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 747
 748         if (likely(req->qtcb)) {
 749                 req->qtcb->prefix.req_seq_no = req->adapter->fsf_req_seq_no;
 750                 req->qtcb->prefix.req_id = req->req_id;
 751                 req->qtcb->prefix.ulp_info = 26;
 752                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command];
 753                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
 754                 req->qtcb->header.req_handle = req->req_id;
 755                 req->qtcb->header.fsf_command = req->fsf_command;
 756                 req->seq_no = adapter->fsf_req_seq_no;
 757                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 758                 sbale[1].addr = (void *) req->qtcb;
 759                 sbale[1].length = sizeof(struct fsf_qtcb);
 760         }
 761
 762         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) {
 763                 zfcp_fsf_req_free(req);
 764                 return ERR_PTR(-EIO);
 765         }
 766
 767         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP))
 768                 req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
 769
 770         return req;
 771 }
 772
 773 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 774 {
 775         struct zfcp_adapter *adapter = req->adapter;
 776         unsigned long flags;
 777         int idx;
 778
 779         /* put allocated FSF request into hash table */
 780         spin_lock_irqsave(&adapter->req_list_lock, flags);
 781         idx = zfcp_reqlist_hash(req->req_id);
 782         list_add_tail(&req->list, &adapter->req_list[idx]);
 783         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 784
 785         req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
 786         req->issued = get_clock();
 787         if (zfcp_qdio_send(req)) {
 788                 del_timer(&req->timer);
 789                 spin_lock_irqsave(&adapter->req_list_lock, flags);
 790                 /* lookup request again, list might have changed */
 791                 if (zfcp_reqlist_find_safe(adapter, req))
 792                         zfcp_reqlist_remove(adapter, req);
 793                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 794                 zfcp_erp_adapter_reopen(adapter, 0, 116, req);
 795                 return -EIO;
 796         }
 797
 798         /* Don't increase for unsolicited status */
 799         if (req->qtcb)
 800                 adapter->fsf_req_seq_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, 104,
 874                                                 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, 105, 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, 47, 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, 48, 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                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 902                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 903                         break;
 904                 }
 905                 break;
 906         case FSF_GOOD:
 907                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 908                 break;
 909         }
 910 }
 911
 912 /**
 913  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 914  * @old_req_id: unsigned long
 915  * @adapter: pointer to struct zfcp_adapter
 916  * @unit: pointer to struct zfcp_unit
 917  * @req_flags: integer specifying the request flags
 918  * Returns: pointer to struct zfcp_fsf_req
 919  *
 920  * FIXME(design): should be watched by a timeout !!!
 921  */
 922
 923 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 924                                                 struct zfcp_adapter *adapter,
 925                                                 struct zfcp_unit *unit,
 926                                                 int req_flags)
 927 {
 928         struct qdio_buffer_element *sbale;
 929         struct zfcp_fsf_req *req = NULL;
 930
 931         spin_lock(&adapter->req_q_lock);
 932         if (!zfcp_fsf_sbal_available(adapter))
 933                 goto out;
 934         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 935                                   req_flags, adapter->pool.fsf_req_abort);
 936         if (IS_ERR(req)) {
 937                 req = NULL;
 938                 goto out;
 939         }
 940
 941         if (unlikely(!(atomic_read(&unit->status) &
 942                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 943                 goto out_error_free;
 944
 945         sbale = zfcp_qdio_sbale_req(req);
 946         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 947         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 948
 949         req->data = unit;
 950         req->handler = zfcp_fsf_abort_fcp_command_handler;
 951         req->qtcb->header.lun_handle = unit->handle;
 952         req->qtcb->header.port_handle = unit->port->handle;
 953         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 954
 955         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 956         if (!zfcp_fsf_req_send(req))
 957                 goto out;
 958
 959 out_error_free:
 960         zfcp_fsf_req_free(req);
 961         req = NULL;
 962 out:
 963         spin_unlock(&adapter->req_q_lock);
 964         return req;
 965 }
 966
 967 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 968 {
 969         struct zfcp_adapter *adapter = req->adapter;
 970         struct zfcp_send_ct *send_ct = req->data;
 971         struct fsf_qtcb_header *header = &req->qtcb->header;
 972
 973         send_ct->status = -EINVAL;
 974
 975         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 976                 goto skip_fsfstatus;
 977
 978         switch (header->fsf_status) {
 979         case FSF_GOOD:
 980                 zfcp_san_dbf_event_ct_response(req);
 981                 send_ct->status = 0;
 982                 break;
 983         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 984                 zfcp_fsf_class_not_supp(req);
 985                 break;
 986         case FSF_ADAPTER_STATUS_AVAILABLE:
 987                 switch (header->fsf_status_qual.word[0]){
 988                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 989                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 990                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 991                         break;
 992                 }
 993                 break;
 994         case FSF_ACCESS_DENIED:
 995                 break;
 996         case FSF_PORT_BOXED:
 997                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 998                                ZFCP_STATUS_FSFREQ_RETRY;
 999                 break;
1000         case FSF_PORT_HANDLE_NOT_VALID:
1001                 zfcp_erp_adapter_reopen(adapter, 0, 106, req);
1002         case FSF_GENERIC_COMMAND_REJECTED:
1003         case FSF_PAYLOAD_SIZE_MISMATCH:
1004         case FSF_REQUEST_SIZE_TOO_LARGE:
1005         case FSF_RESPONSE_SIZE_TOO_LARGE:
1006         case FSF_SBAL_MISMATCH:
1007                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1008                 break;
1009         }
1010
1011 skip_fsfstatus:
1012         if (send_ct->handler)
1013                 send_ct->handler(send_ct->handler_data);
1014 }
1015
1016 static int zfcp_fsf_setup_sbals(struct zfcp_fsf_req *req,
1017                                 struct scatterlist *sg_req,
1018                                 struct scatterlist *sg_resp, int max_sbals)
1019 {
1020         int bytes;
1021
1022         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1023                                         sg_req, max_sbals);
1024         if (bytes <= 0)
1025                 return -ENOMEM;
1026         req->qtcb->bottom.support.req_buf_length = bytes;
1027         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1028
1029         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1030                                         sg_resp, max_sbals);
1031         if (bytes <= 0)
1032                 return -ENOMEM;
1033         req->qtcb->bottom.support.resp_buf_length = bytes;
1034
1035         return 0;
1036 }
1037
1038 /**
1039  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1040  * @ct: pointer to struct zfcp_send_ct with data for request
1041  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1042  * @erp_action: if non-null the Generic Service request sent within ERP
1043  */
1044 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1045                      struct zfcp_erp_action *erp_action)
1046 {
1047         struct zfcp_wka_port *wka_port = ct->wka_port;
1048         struct zfcp_adapter *adapter = wka_port->adapter;
1049         struct zfcp_fsf_req *req;
1050         int ret = -EIO;
1051
1052         spin_lock_bh(&adapter->req_q_lock);
1053         if (zfcp_fsf_req_sbal_get(adapter))
1054                 goto out;
1055
1056         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1057                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1058         if (IS_ERR(req)) {
1059                 ret = PTR_ERR(req);
1060                 goto out;
1061         }
1062
1063         ret = zfcp_fsf_setup_sbals(req, ct->req, ct->resp,
1064                                    FSF_MAX_SBALS_PER_REQ);
1065         if (ret)
1066                 goto failed_send;
1067
1068         req->handler = zfcp_fsf_send_ct_handler;
1069         req->qtcb->header.port_handle = wka_port->handle;
1070         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1071         req->qtcb->bottom.support.timeout = ct->timeout;
1072         req->data = ct;
1073
1074         zfcp_san_dbf_event_ct_request(req);
1075
1076         if (erp_action) {
1077                 erp_action->fsf_req = req;
1078                 req->erp_action = erp_action;
1079                 zfcp_fsf_start_erp_timer(req);
1080         } else
1081                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1082
1083         ret = zfcp_fsf_req_send(req);
1084         if (ret)
1085                 goto failed_send;
1086
1087         goto out;
1088
1089 failed_send:
1090         zfcp_fsf_req_free(req);
1091         if (erp_action)
1092                 erp_action->fsf_req = NULL;
1093 out:
1094         spin_unlock_bh(&adapter->req_q_lock);
1095         return ret;
1096 }
1097
1098 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1099 {
1100         struct zfcp_send_els *send_els = req->data;
1101         struct zfcp_port *port = send_els->port;
1102         struct fsf_qtcb_header *header = &req->qtcb->header;
1103
1104         send_els->status = -EINVAL;
1105
1106         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1107                 goto skip_fsfstatus;
1108
1109         switch (header->fsf_status) {
1110         case FSF_GOOD:
1111                 zfcp_san_dbf_event_els_response(req);
1112                 send_els->status = 0;
1113                 break;
1114         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1115                 zfcp_fsf_class_not_supp(req);
1116                 break;
1117         case FSF_ADAPTER_STATUS_AVAILABLE:
1118                 switch (header->fsf_status_qual.word[0]){
1119                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1120                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1121                                 zfcp_test_link(port);
1122                         /*fall through */
1123                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1124                 case FSF_SQ_RETRY_IF_POSSIBLE:
1125                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1126                         break;
1127                 }
1128                 break;
1129         case FSF_ELS_COMMAND_REJECTED:
1130         case FSF_PAYLOAD_SIZE_MISMATCH:
1131         case FSF_REQUEST_SIZE_TOO_LARGE:
1132         case FSF_RESPONSE_SIZE_TOO_LARGE:
1133                 break;
1134         case FSF_ACCESS_DENIED:
1135                 zfcp_fsf_access_denied_port(req, port);
1136                 break;
1137         case FSF_SBAL_MISMATCH:
1138                 /* should never occure, avoided in zfcp_fsf_send_els */
1139                 /* fall through */
1140         default:
1141                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1142                 break;
1143         }
1144 skip_fsfstatus:
1145         if (send_els->handler)
1146                 send_els->handler(send_els->handler_data);
1147 }
1148
1149 /**
1150  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1151  * @els: pointer to struct zfcp_send_els with data for the command
1152  */
1153 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1154 {
1155         struct zfcp_fsf_req *req;
1156         struct zfcp_adapter *adapter = els->adapter;
1157         struct fsf_qtcb_bottom_support *bottom;
1158         int ret = -EIO;
1159
1160         if (unlikely(!(atomic_read(&els->port->status) &
1161                        ZFCP_STATUS_COMMON_UNBLOCKED)))
1162                 return -EBUSY;
1163
1164         spin_lock(&adapter->req_q_lock);
1165         if (!zfcp_fsf_sbal_available(adapter))
1166                 goto out;
1167         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1168                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1169         if (IS_ERR(req)) {
1170                 ret = PTR_ERR(req);
1171                 goto out;
1172         }
1173
1174         ret = zfcp_fsf_setup_sbals(req, els->req, els->resp, 2);
1175
1176         if (ret)
1177                 goto failed_send;
1178
1179         bottom = &req->qtcb->bottom.support;
1180         req->handler = zfcp_fsf_send_els_handler;
1181         bottom->d_id = els->d_id;
1182         bottom->service_class = FSF_CLASS_3;
1183         bottom->timeout = 2 * R_A_TOV;
1184         req->data = els;
1185
1186         zfcp_san_dbf_event_els_request(req);
1187
1188         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1189         ret = zfcp_fsf_req_send(req);
1190         if (ret)
1191                 goto failed_send;
1192
1193         goto out;
1194
1195 failed_send:
1196         zfcp_fsf_req_free(req);
1197 out:
1198         spin_unlock(&adapter->req_q_lock);
1199         return ret;
1200 }
1201
1202 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1203 {
1204         struct qdio_buffer_element *sbale;
1205         struct zfcp_fsf_req *req;
1206         struct zfcp_adapter *adapter = erp_action->adapter;
1207         int retval = -EIO;
1208
1209         spin_lock_bh(&adapter->req_q_lock);
1210         if (!zfcp_fsf_sbal_available(adapter))
1211                 goto out;
1212         req = zfcp_fsf_req_create(adapter,
1213                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1214                                   ZFCP_REQ_AUTO_CLEANUP,
1215                                   adapter->pool.fsf_req_erp);
1216         if (IS_ERR(req)) {
1217                 retval = PTR_ERR(req);
1218                 goto out;
1219         }
1220
1221         sbale = zfcp_qdio_sbale_req(req);
1222         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1223         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1224
1225         req->qtcb->bottom.config.feature_selection =
1226                         FSF_FEATURE_CFDC |
1227                         FSF_FEATURE_LUN_SHARING |
1228                         FSF_FEATURE_NOTIFICATION_LOST |
1229                         FSF_FEATURE_UPDATE_ALERT;
1230         req->erp_action = erp_action;
1231         req->handler = zfcp_fsf_exchange_config_data_handler;
1232         erp_action->fsf_req = req;
1233
1234         zfcp_fsf_start_erp_timer(req);
1235         retval = zfcp_fsf_req_send(req);
1236         if (retval) {
1237                 zfcp_fsf_req_free(req);
1238                 erp_action->fsf_req = NULL;
1239         }
1240 out:
1241         spin_unlock_bh(&adapter->req_q_lock);
1242         return retval;
1243 }
1244
1245 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1246                                        struct fsf_qtcb_bottom_config *data)
1247 {
1248         struct qdio_buffer_element *sbale;
1249         struct zfcp_fsf_req *req = NULL;
1250         int retval = -EIO;
1251
1252         spin_lock_bh(&adapter->req_q_lock);
1253         if (zfcp_fsf_req_sbal_get(adapter))
1254                 goto out;
1255
1256         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1257                                   0, NULL);
1258         if (IS_ERR(req)) {
1259                 retval = PTR_ERR(req);
1260                 goto out;
1261         }
1262
1263         sbale = zfcp_qdio_sbale_req(req);
1264         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1265         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1266         req->handler = zfcp_fsf_exchange_config_data_handler;
1267
1268         req->qtcb->bottom.config.feature_selection =
1269                         FSF_FEATURE_CFDC |
1270                         FSF_FEATURE_LUN_SHARING |
1271                         FSF_FEATURE_NOTIFICATION_LOST |
1272                         FSF_FEATURE_UPDATE_ALERT;
1273
1274         if (data)
1275                 req->data = data;
1276
1277         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1278         retval = zfcp_fsf_req_send(req);
1279 out:
1280         spin_unlock_bh(&adapter->req_q_lock);
1281         if (!retval)
1282                 wait_event(req->completion_wq,
1283                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1284
1285         zfcp_fsf_req_free(req);
1286
1287         return retval;
1288 }
1289
1290 /**
1291  * zfcp_fsf_exchange_port_data - request information about local port
1292  * @erp_action: ERP action for the adapter for which port data is requested
1293  * Returns: 0 on success, error otherwise
1294  */
1295 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1296 {
1297         struct qdio_buffer_element *sbale;
1298         struct zfcp_fsf_req *req;
1299         struct zfcp_adapter *adapter = erp_action->adapter;
1300         int retval = -EIO;
1301
1302         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1303                 return -EOPNOTSUPP;
1304
1305         spin_lock_bh(&adapter->req_q_lock);
1306         if (!zfcp_fsf_sbal_available(adapter))
1307                 goto out;
1308         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1309                                   ZFCP_REQ_AUTO_CLEANUP,
1310                                   adapter->pool.fsf_req_erp);
1311         if (IS_ERR(req)) {
1312                 retval = PTR_ERR(req);
1313                 goto out;
1314         }
1315
1316         sbale = zfcp_qdio_sbale_req(req);
1317         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1318         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1319
1320         req->handler = zfcp_fsf_exchange_port_data_handler;
1321         req->erp_action = erp_action;
1322         erp_action->fsf_req = req;
1323
1324         zfcp_fsf_start_erp_timer(req);
1325         retval = zfcp_fsf_req_send(req);
1326         if (retval) {
1327                 zfcp_fsf_req_free(req);
1328                 erp_action->fsf_req = NULL;
1329         }
1330 out:
1331         spin_unlock_bh(&adapter->req_q_lock);
1332         return retval;
1333 }
1334
1335 /**
1336  * zfcp_fsf_exchange_port_data_sync - request information about local port
1337  * @adapter: pointer to struct zfcp_adapter
1338  * @data: pointer to struct fsf_qtcb_bottom_port
1339  * Returns: 0 on success, error otherwise
1340  */
1341 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1342                                      struct fsf_qtcb_bottom_port *data)
1343 {
1344         struct qdio_buffer_element *sbale;
1345         struct zfcp_fsf_req *req = NULL;
1346         int retval = -EIO;
1347
1348         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1349                 return -EOPNOTSUPP;
1350
1351         spin_lock_bh(&adapter->req_q_lock);
1352         if (!zfcp_fsf_sbal_available(adapter))
1353                 goto out;
1354
1355         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1356                                   NULL);
1357         if (IS_ERR(req)) {
1358                 retval = PTR_ERR(req);
1359                 goto out;
1360         }
1361
1362         if (data)
1363                 req->data = data;
1364
1365         sbale = zfcp_qdio_sbale_req(req);
1366         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1367         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1368
1369         req->handler = zfcp_fsf_exchange_port_data_handler;
1370         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1371         retval = zfcp_fsf_req_send(req);
1372 out:
1373         spin_unlock_bh(&adapter->req_q_lock);
1374         if (!retval)
1375                 wait_event(req->completion_wq,
1376                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1377         zfcp_fsf_req_free(req);
1378
1379         return retval;
1380 }
1381
1382 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1383 {
1384         struct zfcp_port *port = req->data;
1385         struct fsf_qtcb_header *header = &req->qtcb->header;
1386         struct fsf_plogi *plogi;
1387
1388         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1389                 return;
1390
1391         switch (header->fsf_status) {
1392         case FSF_PORT_ALREADY_OPEN:
1393                 break;
1394         case FSF_ACCESS_DENIED:
1395                 zfcp_fsf_access_denied_port(req, port);
1396                 break;
1397         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1398                 dev_warn(&req->adapter->ccw_device->dev,
1399                          "Not enough FCP adapter resources to open "
1400                          "remote port 0x%016Lx\n",
1401                          (unsigned long long)port->wwpn);
1402                 zfcp_erp_port_failed(port, 31, req);
1403                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1404                 break;
1405         case FSF_ADAPTER_STATUS_AVAILABLE:
1406                 switch (header->fsf_status_qual.word[0]) {
1407                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1408                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1409                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1410                         break;
1411                 case FSF_SQ_NO_RETRY_POSSIBLE:
1412                         dev_warn(&req->adapter->ccw_device->dev,
1413                                  "Remote port 0x%016Lx could not be opened\n",
1414                                  (unsigned long long)port->wwpn);
1415                         zfcp_erp_port_failed(port, 32, req);
1416                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1417                         break;
1418                 }
1419                 break;
1420         case FSF_GOOD:
1421                 port->handle = header->port_handle;
1422                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1423                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1424                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1425                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1426                                   &port->status);
1427                 /* check whether D_ID has changed during open */
1428                 /*
1429                  * FIXME: This check is not airtight, as the FCP channel does
1430                  * not monitor closures of target port connections caused on
1431                  * the remote side. Thus, they might miss out on invalidating
1432                  * locally cached WWPNs (and other N_Port parameters) of gone
1433                  * target ports. So, our heroic attempt to make things safe
1434                  * could be undermined by 'open port' response data tagged with
1435                  * obsolete WWPNs. Another reason to monitor potential
1436                  * connection closures ourself at least (by interpreting
1437                  * incoming ELS' and unsolicited status). It just crosses my
1438                  * mind that one should be able to cross-check by means of
1439                  * another GID_PN straight after a port has been opened.
1440                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1441                  */
1442                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1443                 if (req->qtcb->bottom.support.els1_length >= sizeof(*plogi)) {
1444                         if (plogi->serv_param.wwpn != port->wwpn)
1445                                 atomic_clear_mask(ZFCP_STATUS_PORT_DID_DID,
1446                                                   &port->status);
1447                         else {
1448                                 port->wwnn = plogi->serv_param.wwnn;
1449                                 zfcp_fc_plogi_evaluate(port, plogi);
1450                         }
1451                 }
1452                 break;
1453         case FSF_UNKNOWN_OP_SUBTYPE:
1454                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1455                 break;
1456         }
1457 }
1458
1459 /**
1460  * zfcp_fsf_open_port - create and send open port request
1461  * @erp_action: pointer to struct zfcp_erp_action
1462  * Returns: 0 on success, error otherwise
1463  */
1464 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1465 {
1466         struct qdio_buffer_element *sbale;
1467         struct zfcp_adapter *adapter = erp_action->adapter;
1468         struct zfcp_fsf_req *req;
1469         int retval = -EIO;
1470
1471         spin_lock_bh(&adapter->req_q_lock);
1472         if (zfcp_fsf_req_sbal_get(adapter))
1473                 goto out;
1474
1475         req = zfcp_fsf_req_create(adapter,
1476                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1477                                   ZFCP_REQ_AUTO_CLEANUP,
1478                                   adapter->pool.fsf_req_erp);
1479         if (IS_ERR(req)) {
1480                 retval = PTR_ERR(req);
1481                 goto out;
1482         }
1483
1484         sbale = zfcp_qdio_sbale_req(req);
1485         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1486         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1487
1488         req->handler = zfcp_fsf_open_port_handler;
1489         req->qtcb->bottom.support.d_id = erp_action->port->d_id;
1490         req->data = erp_action->port;
1491         req->erp_action = erp_action;
1492         erp_action->fsf_req = req;
1493
1494         zfcp_fsf_start_erp_timer(req);
1495         retval = zfcp_fsf_req_send(req);
1496         if (retval) {
1497                 zfcp_fsf_req_free(req);
1498                 erp_action->fsf_req = NULL;
1499         }
1500 out:
1501         spin_unlock_bh(&adapter->req_q_lock);
1502         return retval;
1503 }
1504
1505 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1506 {
1507         struct zfcp_port *port = req->data;
1508
1509         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1510                 return;
1511
1512         switch (req->qtcb->header.fsf_status) {
1513         case FSF_PORT_HANDLE_NOT_VALID:
1514                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, req);
1515                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1516                 break;
1517         case FSF_ADAPTER_STATUS_AVAILABLE:
1518                 break;
1519         case FSF_GOOD:
1520                 zfcp_erp_modify_port_status(port, 33, req,
1521                                             ZFCP_STATUS_COMMON_OPEN,
1522                                             ZFCP_CLEAR);
1523                 break;
1524         }
1525 }
1526
1527 /**
1528  * zfcp_fsf_close_port - create and send close port request
1529  * @erp_action: pointer to struct zfcp_erp_action
1530  * Returns: 0 on success, error otherwise
1531  */
1532 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1533 {
1534         struct qdio_buffer_element *sbale;
1535         struct zfcp_adapter *adapter = erp_action->adapter;
1536         struct zfcp_fsf_req *req;
1537         int retval = -EIO;
1538
1539         spin_lock_bh(&adapter->req_q_lock);
1540         if (zfcp_fsf_req_sbal_get(adapter))
1541                 goto out;
1542
1543         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1544                                   ZFCP_REQ_AUTO_CLEANUP,
1545                                   adapter->pool.fsf_req_erp);
1546         if (IS_ERR(req)) {
1547                 retval = PTR_ERR(req);
1548                 goto out;
1549         }
1550
1551         sbale = zfcp_qdio_sbale_req(req);
1552         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1553         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1554
1555         req->handler = zfcp_fsf_close_port_handler;
1556         req->data = erp_action->port;
1557         req->erp_action = erp_action;
1558         req->qtcb->header.port_handle = erp_action->port->handle;
1559         erp_action->fsf_req = req;
1560
1561         zfcp_fsf_start_erp_timer(req);
1562         retval = zfcp_fsf_req_send(req);
1563         if (retval) {
1564                 zfcp_fsf_req_free(req);
1565                 erp_action->fsf_req = NULL;
1566         }
1567 out:
1568         spin_unlock_bh(&adapter->req_q_lock);
1569         return retval;
1570 }
1571
1572 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1573 {
1574         struct zfcp_wka_port *wka_port = req->data;
1575         struct fsf_qtcb_header *header = &req->qtcb->header;
1576
1577         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1578                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1579                 goto out;
1580         }
1581
1582         switch (header->fsf_status) {
1583         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1584                 dev_warn(&req->adapter->ccw_device->dev,
1585                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1586         case FSF_ADAPTER_STATUS_AVAILABLE:
1587                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1588         case FSF_ACCESS_DENIED:
1589                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1590                 break;
1591         case FSF_PORT_ALREADY_OPEN:
1592                 break;
1593         case FSF_GOOD:
1594                 wka_port->handle = header->port_handle;
1595                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1596         }
1597 out:
1598         wake_up(&wka_port->completion_wq);
1599 }
1600
1601 /**
1602  * zfcp_fsf_open_wka_port - create and send open wka-port request
1603  * @wka_port: pointer to struct zfcp_wka_port
1604  * Returns: 0 on success, error otherwise
1605  */
1606 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1607 {
1608         struct qdio_buffer_element *sbale;
1609         struct zfcp_adapter *adapter = wka_port->adapter;
1610         struct zfcp_fsf_req *req;
1611         int retval = -EIO;
1612
1613         spin_lock_bh(&adapter->req_q_lock);
1614         if (zfcp_fsf_req_sbal_get(adapter))
1615                 goto out;
1616
1617         req = zfcp_fsf_req_create(adapter,
1618                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1619                                   ZFCP_REQ_AUTO_CLEANUP,
1620                                   adapter->pool.fsf_req_erp);
1621         if (unlikely(IS_ERR(req))) {
1622                 retval = PTR_ERR(req);
1623                 goto out;
1624         }
1625
1626         sbale = zfcp_qdio_sbale_req(req);
1627         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1628         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1629
1630         req->handler = zfcp_fsf_open_wka_port_handler;
1631         req->qtcb->bottom.support.d_id = wka_port->d_id;
1632         req->data = wka_port;
1633
1634         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1635         retval = zfcp_fsf_req_send(req);
1636         if (retval)
1637                 zfcp_fsf_req_free(req);
1638 out:
1639         spin_unlock_bh(&adapter->req_q_lock);
1640         return retval;
1641 }
1642
1643 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1644 {
1645         struct zfcp_wka_port *wka_port = req->data;
1646
1647         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1648                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1649                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, 84, req);
1650         }
1651
1652         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1653         wake_up(&wka_port->completion_wq);
1654 }
1655
1656 /**
1657  * zfcp_fsf_close_wka_port - create and send close wka port request
1658  * @erp_action: pointer to struct zfcp_erp_action
1659  * Returns: 0 on success, error otherwise
1660  */
1661 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1662 {
1663         struct qdio_buffer_element *sbale;
1664         struct zfcp_adapter *adapter = wka_port->adapter;
1665         struct zfcp_fsf_req *req;
1666         int retval = -EIO;
1667
1668         spin_lock_bh(&adapter->req_q_lock);
1669         if (zfcp_fsf_req_sbal_get(adapter))
1670                 goto out;
1671
1672         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1673                                   ZFCP_REQ_AUTO_CLEANUP,
1674                                   adapter->pool.fsf_req_erp);
1675         if (unlikely(IS_ERR(req))) {
1676                 retval = PTR_ERR(req);
1677                 goto out;
1678         }
1679
1680         sbale = zfcp_qdio_sbale_req(req);
1681         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1682         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1683
1684         req->handler = zfcp_fsf_close_wka_port_handler;
1685         req->data = wka_port;
1686         req->qtcb->header.port_handle = wka_port->handle;
1687
1688         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1689         retval = zfcp_fsf_req_send(req);
1690         if (retval)
1691                 zfcp_fsf_req_free(req);
1692 out:
1693         spin_unlock_bh(&adapter->req_q_lock);
1694         return retval;
1695 }
1696
1697 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1698 {
1699         struct zfcp_port *port = req->data;
1700         struct fsf_qtcb_header *header = &req->qtcb->header;
1701         struct zfcp_unit *unit;
1702
1703         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1704                 goto skip_fsfstatus;
1705
1706         switch (header->fsf_status) {
1707         case FSF_PORT_HANDLE_NOT_VALID:
1708                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, req);
1709                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1710                 break;
1711         case FSF_ACCESS_DENIED:
1712                 zfcp_fsf_access_denied_port(req, port);
1713                 break;
1714         case FSF_PORT_BOXED:
1715                 zfcp_erp_port_boxed(port, 50, req);
1716                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1717                                ZFCP_STATUS_FSFREQ_RETRY;
1718                 /* can't use generic zfcp_erp_modify_port_status because
1719                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1720                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1721                 list_for_each_entry(unit, &port->unit_list_head, list)
1722                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1723                                           &unit->status);
1724                 break;
1725         case FSF_ADAPTER_STATUS_AVAILABLE:
1726                 switch (header->fsf_status_qual.word[0]) {
1727                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1728                         /* fall through */
1729                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1730                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1731                         break;
1732                 }
1733                 break;
1734         case FSF_GOOD:
1735                 /* can't use generic zfcp_erp_modify_port_status because
1736                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1737                  */
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         }
1744 skip_fsfstatus:
1745         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
1746 }
1747
1748 /**
1749  * zfcp_fsf_close_physical_port - close physical port
1750  * @erp_action: pointer to struct zfcp_erp_action
1751  * Returns: 0 on success
1752  */
1753 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1754 {
1755         struct qdio_buffer_element *sbale;
1756         struct zfcp_adapter *adapter = erp_action->adapter;
1757         struct zfcp_fsf_req *req;
1758         int retval = -EIO;
1759
1760         spin_lock_bh(&adapter->req_q_lock);
1761         if (zfcp_fsf_req_sbal_get(adapter))
1762                 goto out;
1763
1764         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1765                                   ZFCP_REQ_AUTO_CLEANUP,
1766                                   adapter->pool.fsf_req_erp);
1767         if (IS_ERR(req)) {
1768                 retval = PTR_ERR(req);
1769                 goto out;
1770         }
1771
1772         sbale = zfcp_qdio_sbale_req(req);
1773         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1774         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1775
1776         req->data = erp_action->port;
1777         req->qtcb->header.port_handle = erp_action->port->handle;
1778         req->erp_action = erp_action;
1779         req->handler = zfcp_fsf_close_physical_port_handler;
1780         erp_action->fsf_req = req;
1781         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
1782                         &erp_action->port->status);
1783
1784         zfcp_fsf_start_erp_timer(req);
1785         retval = zfcp_fsf_req_send(req);
1786         if (retval) {
1787                 zfcp_fsf_req_free(req);
1788                 erp_action->fsf_req = NULL;
1789         }
1790 out:
1791         spin_unlock_bh(&adapter->req_q_lock);
1792         return retval;
1793 }
1794
1795 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1796 {
1797         struct zfcp_adapter *adapter = req->adapter;
1798         struct zfcp_unit *unit = req->data;
1799         struct fsf_qtcb_header *header = &req->qtcb->header;
1800         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1801         struct fsf_queue_designator *queue_designator =
1802                                 &header->fsf_status_qual.fsf_queue_designator;
1803         int exclusive, readwrite;
1804
1805         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1806                 return;
1807
1808         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1809                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1810                           ZFCP_STATUS_UNIT_SHARED |
1811                           ZFCP_STATUS_UNIT_READONLY,
1812                           &unit->status);
1813
1814         switch (header->fsf_status) {
1815
1816         case FSF_PORT_HANDLE_NOT_VALID:
1817                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, req);
1818                 /* fall through */
1819         case FSF_LUN_ALREADY_OPEN:
1820                 break;
1821         case FSF_ACCESS_DENIED:
1822                 zfcp_fsf_access_denied_unit(req, unit);
1823                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1824                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1825                 break;
1826         case FSF_PORT_BOXED:
1827                 zfcp_erp_port_boxed(unit->port, 51, req);
1828                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1829                                ZFCP_STATUS_FSFREQ_RETRY;
1830                 break;
1831         case FSF_LUN_SHARING_VIOLATION:
1832                 if (header->fsf_status_qual.word[0])
1833                         dev_warn(&adapter->ccw_device->dev,
1834                                  "LUN 0x%Lx on port 0x%Lx is already in "
1835                                  "use by CSS%d, MIF Image ID %x\n",
1836                                  (unsigned long long)unit->fcp_lun,
1837                                  (unsigned long long)unit->port->wwpn,
1838                                  queue_designator->cssid,
1839                                  queue_designator->hla);
1840                 else
1841                         zfcp_act_eval_err(adapter,
1842                                           header->fsf_status_qual.word[2]);
1843                 zfcp_erp_unit_access_denied(unit, 60, req);
1844                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1845                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1846                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1847                 break;
1848         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1849                 dev_warn(&adapter->ccw_device->dev,
1850                          "No handle is available for LUN "
1851                          "0x%016Lx on port 0x%016Lx\n",
1852                          (unsigned long long)unit->fcp_lun,
1853                          (unsigned long long)unit->port->wwpn);
1854                 zfcp_erp_unit_failed(unit, 34, req);
1855                 /* fall through */
1856         case FSF_INVALID_COMMAND_OPTION:
1857                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1858                 break;
1859         case FSF_ADAPTER_STATUS_AVAILABLE:
1860                 switch (header->fsf_status_qual.word[0]) {
1861                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1862                         zfcp_test_link(unit->port);
1863                         /* fall through */
1864                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1865                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1866                         break;
1867                 }
1868                 break;
1869
1870         case FSF_GOOD:
1871                 unit->handle = header->lun_handle;
1872                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1873
1874                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1875                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1876                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1877                         exclusive = (bottom->lun_access_info &
1878                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1879                         readwrite = (bottom->lun_access_info &
1880                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1881
1882                         if (!exclusive)
1883                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1884                                                 &unit->status);
1885
1886                         if (!readwrite) {
1887                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1888                                                 &unit->status);
1889                                 dev_info(&adapter->ccw_device->dev,
1890                                          "SCSI device at LUN 0x%016Lx on port "
1891                                          "0x%016Lx opened read-only\n",
1892                                          (unsigned long long)unit->fcp_lun,
1893                                          (unsigned long long)unit->port->wwpn);
1894                         }
1895
1896                         if (exclusive && !readwrite) {
1897                                 dev_err(&adapter->ccw_device->dev,
1898                                         "Exclusive read-only access not "
1899                                         "supported (unit 0x%016Lx, "
1900                                         "port 0x%016Lx)\n",
1901                                         (unsigned long long)unit->fcp_lun,
1902                                         (unsigned long long)unit->port->wwpn);
1903                                 zfcp_erp_unit_failed(unit, 35, req);
1904                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1905                                 zfcp_erp_unit_shutdown(unit, 0, 80, req);
1906                         } else if (!exclusive && readwrite) {
1907                                 dev_err(&adapter->ccw_device->dev,
1908                                         "Shared read-write access not "
1909                                         "supported (unit 0x%016Lx, port "
1910                                         "0x%016Lx\n)",
1911                                         (unsigned long long)unit->fcp_lun,
1912                                         (unsigned long long)unit->port->wwpn);
1913                                 zfcp_erp_unit_failed(unit, 36, req);
1914                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1915                                 zfcp_erp_unit_shutdown(unit, 0, 81, req);
1916                         }
1917                 }
1918                 break;
1919         }
1920 }
1921
1922 /**
1923  * zfcp_fsf_open_unit - open unit
1924  * @erp_action: pointer to struct zfcp_erp_action
1925  * Returns: 0 on success, error otherwise
1926  */
1927 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1928 {
1929         struct qdio_buffer_element *sbale;
1930         struct zfcp_adapter *adapter = erp_action->adapter;
1931         struct zfcp_fsf_req *req;
1932         int retval = -EIO;
1933
1934         spin_lock_bh(&adapter->req_q_lock);
1935         if (zfcp_fsf_req_sbal_get(adapter))
1936                 goto out;
1937
1938         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1939                                   ZFCP_REQ_AUTO_CLEANUP,
1940                                   adapter->pool.fsf_req_erp);
1941         if (IS_ERR(req)) {
1942                 retval = PTR_ERR(req);
1943                 goto out;
1944         }
1945
1946         sbale = zfcp_qdio_sbale_req(req);
1947         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1948         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1949
1950         req->qtcb->header.port_handle = erp_action->port->handle;
1951         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1952         req->handler = zfcp_fsf_open_unit_handler;
1953         req->data = erp_action->unit;
1954         req->erp_action = erp_action;
1955         erp_action->fsf_req = req;
1956
1957         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1958                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1959
1960         zfcp_fsf_start_erp_timer(req);
1961         retval = zfcp_fsf_req_send(req);
1962         if (retval) {
1963                 zfcp_fsf_req_free(req);
1964                 erp_action->fsf_req = NULL;
1965         }
1966 out:
1967         spin_unlock_bh(&adapter->req_q_lock);
1968         return retval;
1969 }
1970
1971 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1972 {
1973         struct zfcp_unit *unit = req->data;
1974
1975         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1976                 return;
1977
1978         switch (req->qtcb->header.fsf_status) {
1979         case FSF_PORT_HANDLE_NOT_VALID:
1980                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, req);
1981                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1982                 break;
1983         case FSF_LUN_HANDLE_NOT_VALID:
1984                 zfcp_erp_port_reopen(unit->port, 0, 111, req);
1985                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1986                 break;
1987         case FSF_PORT_BOXED:
1988                 zfcp_erp_port_boxed(unit->port, 52, req);
1989                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1990                                ZFCP_STATUS_FSFREQ_RETRY;
1991                 break;
1992         case FSF_ADAPTER_STATUS_AVAILABLE:
1993                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
1994                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1995                         zfcp_test_link(unit->port);
1996                         /* fall through */
1997                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1998                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1999                         break;
2000                 }
2001                 break;
2002         case FSF_GOOD:
2003                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2004                 break;
2005         }
2006 }
2007
2008 /**
2009  * zfcp_fsf_close_unit - close zfcp unit
2010  * @erp_action: pointer to struct zfcp_unit
2011  * Returns: 0 on success, error otherwise
2012  */
2013 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2014 {
2015         struct qdio_buffer_element *sbale;
2016         struct zfcp_adapter *adapter = erp_action->adapter;
2017         struct zfcp_fsf_req *req;
2018         int retval = -EIO;
2019
2020         spin_lock_bh(&adapter->req_q_lock);
2021         if (zfcp_fsf_req_sbal_get(adapter))
2022                 goto out;
2023         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2024                                   ZFCP_REQ_AUTO_CLEANUP,
2025                                   adapter->pool.fsf_req_erp);
2026         if (IS_ERR(req)) {
2027                 retval = PTR_ERR(req);
2028                 goto out;
2029         }
2030
2031         sbale = zfcp_qdio_sbale_req(req);
2032         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2033         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2034
2035         req->qtcb->header.port_handle = erp_action->port->handle;
2036         req->qtcb->header.lun_handle = erp_action->unit->handle;
2037         req->handler = zfcp_fsf_close_unit_handler;
2038         req->data = erp_action->unit;
2039         req->erp_action = erp_action;
2040         erp_action->fsf_req = req;
2041
2042         zfcp_fsf_start_erp_timer(req);
2043         retval = zfcp_fsf_req_send(req);
2044         if (retval) {
2045                 zfcp_fsf_req_free(req);
2046                 erp_action->fsf_req = NULL;
2047         }
2048 out:
2049         spin_unlock_bh(&adapter->req_q_lock);
2050         return retval;
2051 }
2052
2053 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2054 {
2055         lat_rec->sum += lat;
2056         lat_rec->min = min(lat_rec->min, lat);
2057         lat_rec->max = max(lat_rec->max, lat);
2058 }
2059
2060 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2061 {
2062         struct fsf_qual_latency_info *lat_inf;
2063         struct latency_cont *lat;
2064         struct zfcp_unit *unit = req->unit;
2065         unsigned long flags;
2066
2067         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2068
2069         switch (req->qtcb->bottom.io.data_direction) {
2070         case FSF_DATADIR_READ:
2071                 lat = &unit->latencies.read;
2072                 break;
2073         case FSF_DATADIR_WRITE:
2074                 lat = &unit->latencies.write;
2075                 break;
2076         case FSF_DATADIR_CMND:
2077                 lat = &unit->latencies.cmd;
2078                 break;
2079         default:
2080                 return;
2081         }
2082
2083         spin_lock_irqsave(&unit->latencies.lock, flags);
2084         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2085         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2086         lat->counter++;
2087         spin_unlock_irqrestore(&unit->latencies.lock, flags);
2088 }
2089
2090 #ifdef CONFIG_BLK_DEV_IO_TRACE
2091 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2092 {
2093         struct fsf_qual_latency_info *lat_inf;
2094         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2095         struct request *req = scsi_cmnd->request;
2096         struct zfcp_blk_drv_data trace;
2097         int ticks = fsf_req->adapter->timer_ticks;
2098
2099         trace.flags = 0;
2100         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2101         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2102                 trace.flags |= ZFCP_BLK_LAT_VALID;
2103                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2104                 trace.channel_lat = lat_inf->channel_lat * ticks;
2105                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2106         }
2107         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2108                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2109         trace.inb_usage = fsf_req->qdio_inb_usage;
2110         trace.outb_usage = fsf_req->qdio_outb_usage;
2111
2112         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2113 }
2114 #else
2115 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2116 {
2117 }
2118 #endif
2119
2120 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2121 {
2122         struct scsi_cmnd *scpnt;
2123         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2124             &(req->qtcb->bottom.io.fcp_rsp);
2125         u32 sns_len;
2126         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2127         unsigned long flags;
2128
2129         read_lock_irqsave(&req->adapter->abort_lock, flags);
2130
2131         scpnt = req->data;
2132         if (unlikely(!scpnt)) {
2133                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2134                 return;
2135         }
2136
2137         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2138                 set_host_byte(scpnt, DID_SOFT_ERROR);
2139                 set_driver_byte(scpnt, SUGGEST_RETRY);
2140                 goto skip_fsfstatus;
2141         }
2142
2143         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2144                 set_host_byte(scpnt, DID_ERROR);
2145                 goto skip_fsfstatus;
2146         }
2147
2148         set_msg_byte(scpnt, COMMAND_COMPLETE);
2149
2150         scpnt->result |= fcp_rsp_iu->scsi_status;
2151
2152         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2153                 zfcp_fsf_req_latency(req);
2154
2155         zfcp_fsf_trace_latency(req);
2156
2157         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2158                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2159                         set_host_byte(scpnt, DID_OK);
2160                 else {
2161                         set_host_byte(scpnt, DID_ERROR);
2162                         goto skip_fsfstatus;
2163                 }
2164         }
2165
2166         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2167                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2168                           fcp_rsp_iu->fcp_rsp_len;
2169                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2170                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2171
2172                 memcpy(scpnt->sense_buffer,
2173                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2174         }
2175
2176         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2177                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2178                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2179                     scpnt->underflow)
2180                         set_host_byte(scpnt, DID_ERROR);
2181         }
2182 skip_fsfstatus:
2183         if (scpnt->result != 0)
2184                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2185         else if (scpnt->retries > 0)
2186                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2187         else
2188                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2189
2190         scpnt->host_scribble = NULL;
2191         (scpnt->scsi_done) (scpnt);
2192         /*
2193          * We must hold this lock until scsi_done has been called.
2194          * Otherwise we may call scsi_done after abort regarding this
2195          * command has completed.
2196          * Note: scsi_done must not block!
2197          */
2198         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2199 }
2200
2201 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2202 {
2203         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2204             &(req->qtcb->bottom.io.fcp_rsp);
2205         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2206
2207         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2208              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2209                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2210 }
2211
2212
2213 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2214 {
2215         struct zfcp_unit *unit;
2216         struct fsf_qtcb_header *header = &req->qtcb->header;
2217
2218         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2219                 unit = req->data;
2220         else
2221                 unit = req->unit;
2222
2223         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2224                 goto skip_fsfstatus;
2225
2226         switch (header->fsf_status) {
2227         case FSF_HANDLE_MISMATCH:
2228         case FSF_PORT_HANDLE_NOT_VALID:
2229                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, req);
2230                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2231                 break;
2232         case FSF_FCPLUN_NOT_VALID:
2233         case FSF_LUN_HANDLE_NOT_VALID:
2234                 zfcp_erp_port_reopen(unit->port, 0, 113, req);
2235                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2236                 break;
2237         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2238                 zfcp_fsf_class_not_supp(req);
2239                 break;
2240         case FSF_ACCESS_DENIED:
2241                 zfcp_fsf_access_denied_unit(req, unit);
2242                 break;
2243         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2244                 dev_err(&req->adapter->ccw_device->dev,
2245                         "Incorrect direction %d, unit 0x%016Lx on port "
2246                         "0x%016Lx closed\n",
2247                         req->qtcb->bottom.io.data_direction,
2248                         (unsigned long long)unit->fcp_lun,
2249                         (unsigned long long)unit->port->wwpn);
2250                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, req);
2251                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2252                 break;
2253         case FSF_CMND_LENGTH_NOT_VALID:
2254                 dev_err(&req->adapter->ccw_device->dev,
2255                         "Incorrect CDB length %d, unit 0x%016Lx on "
2256                         "port 0x%016Lx closed\n",
2257                         req->qtcb->bottom.io.fcp_cmnd_length,
2258                         (unsigned long long)unit->fcp_lun,
2259                         (unsigned long long)unit->port->wwpn);
2260                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, req);
2261                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2262                 break;
2263         case FSF_PORT_BOXED:
2264                 zfcp_erp_port_boxed(unit->port, 53, req);
2265                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2266                                ZFCP_STATUS_FSFREQ_RETRY;
2267                 break;
2268         case FSF_LUN_BOXED:
2269                 zfcp_erp_unit_boxed(unit, 54, req);
2270                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2271                                ZFCP_STATUS_FSFREQ_RETRY;
2272                 break;
2273         case FSF_ADAPTER_STATUS_AVAILABLE:
2274                 if (header->fsf_status_qual.word[0] ==
2275                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2276                         zfcp_test_link(unit->port);
2277                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2278                 break;
2279         }
2280 skip_fsfstatus:
2281         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2282                 zfcp_fsf_send_fcp_ctm_handler(req);
2283         else {
2284                 zfcp_fsf_send_fcp_command_task_handler(req);
2285                 req->unit = NULL;
2286                 zfcp_unit_put(unit);
2287         }
2288 }
2289
2290 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2291 {
2292         u32 *fcp_dl_ptr;
2293
2294         /*
2295          * fcp_dl_addr = start address of fcp_cmnd structure +
2296          * size of fixed part + size of dynamically sized add_dcp_cdb field
2297          * SEE FCP-2 documentation
2298          */
2299         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2300                         (fcp_cmd->add_fcp_cdb_length << 2));
2301         *fcp_dl_ptr = fcp_dl;
2302 }
2303
2304 /**
2305  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2306  * @adapter: adapter where scsi command is issued
2307  * @unit: unit where command is sent to
2308  * @scsi_cmnd: scsi command to be sent
2309  * @timer: timer to be started when request is initiated
2310  * @req_flags: flags for fsf_request
2311  */
2312 int zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
2313                                    struct zfcp_unit *unit,
2314                                    struct scsi_cmnd *scsi_cmnd,
2315                                    int use_timer, int req_flags)
2316 {
2317         struct zfcp_fsf_req *req;
2318         struct fcp_cmnd_iu *fcp_cmnd_iu;
2319         unsigned int sbtype;
2320         int real_bytes, retval = -EIO;
2321
2322         if (unlikely(!(atomic_read(&unit->status) &
2323                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2324                 return -EBUSY;
2325
2326         spin_lock(&adapter->req_q_lock);
2327         if (!zfcp_fsf_sbal_available(adapter))
2328                 goto out;
2329         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2330                                   adapter->pool.fsf_req_scsi);
2331         if (IS_ERR(req)) {
2332                 retval = PTR_ERR(req);
2333                 goto out;
2334         }
2335
2336         zfcp_unit_get(unit);
2337         req->unit = unit;
2338         req->data = scsi_cmnd;
2339         req->handler = zfcp_fsf_send_fcp_command_handler;
2340         req->qtcb->header.lun_handle = unit->handle;
2341         req->qtcb->header.port_handle = unit->port->handle;
2342         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2343
2344         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2345
2346         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2347         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2348         /*
2349          * set depending on data direction:
2350          *      data direction bits in SBALE (SB Type)
2351          *      data direction bits in QTCB
2352          *      data direction bits in FCP_CMND IU
2353          */
2354         switch (scsi_cmnd->sc_data_direction) {
2355         case DMA_NONE:
2356                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2357                 sbtype = SBAL_FLAGS0_TYPE_READ;
2358                 break;
2359         case DMA_FROM_DEVICE:
2360                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2361                 sbtype = SBAL_FLAGS0_TYPE_READ;
2362                 fcp_cmnd_iu->rddata = 1;
2363                 break;
2364         case DMA_TO_DEVICE:
2365                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2366                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2367                 fcp_cmnd_iu->wddata = 1;
2368                 break;
2369         case DMA_BIDIRECTIONAL:
2370         default:
2371                 retval = -EIO;
2372                 goto failed_scsi_cmnd;
2373         }
2374
2375         if (likely((scsi_cmnd->device->simple_tags) ||
2376                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2377                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2378                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2379         else
2380                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2381
2382         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2383                 fcp_cmnd_iu->add_fcp_cdb_length =
2384                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2385
2386         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2387
2388         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2389                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2390
2391         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2392                                              scsi_sglist(scsi_cmnd),
2393                                              FSF_MAX_SBALS_PER_REQ);
2394         if (unlikely(real_bytes < 0)) {
2395                 if (req->sbal_number < FSF_MAX_SBALS_PER_REQ)
2396                         retval = -EIO;
2397                 else {
2398                         dev_err(&adapter->ccw_device->dev,
2399                                 "Oversize data package, unit 0x%016Lx "
2400                                 "on port 0x%016Lx closed\n",
2401                                 (unsigned long long)unit->fcp_lun,
2402                                 (unsigned long long)unit->port->wwpn);
2403                         zfcp_erp_unit_shutdown(unit, 0, 131, req);
2404                         retval = -EINVAL;
2405                 }
2406                 goto failed_scsi_cmnd;
2407         }
2408
2409         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2410
2411         if (use_timer)
2412                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2413
2414         retval = zfcp_fsf_req_send(req);
2415         if (unlikely(retval))
2416                 goto failed_scsi_cmnd;
2417
2418         goto out;
2419
2420 failed_scsi_cmnd:
2421         zfcp_unit_put(unit);
2422         zfcp_fsf_req_free(req);
2423         scsi_cmnd->host_scribble = NULL;
2424 out:
2425         spin_unlock(&adapter->req_q_lock);
2426         return retval;
2427 }
2428
2429 /**
2430  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2431  * @adapter: pointer to struct zfcp-adapter
2432  * @unit: pointer to struct zfcp_unit
2433  * @tm_flags: unsigned byte for task management flags
2434  * @req_flags: int request flags
2435  * Returns: on success pointer to struct fsf_req, NULL otherwise
2436  */
2437 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_adapter *adapter,
2438                                            struct zfcp_unit *unit,
2439                                            u8 tm_flags, int req_flags)
2440 {
2441         struct qdio_buffer_element *sbale;
2442         struct zfcp_fsf_req *req = NULL;
2443         struct fcp_cmnd_iu *fcp_cmnd_iu;
2444
2445         if (unlikely(!(atomic_read(&unit->status) &
2446                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2447                 return NULL;
2448
2449         spin_lock(&adapter->req_q_lock);
2450         if (!zfcp_fsf_sbal_available(adapter))
2451                 goto out;
2452         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2453                                   adapter->pool.fsf_req_scsi);
2454         if (IS_ERR(req)) {
2455                 req = NULL;
2456                 goto out;
2457         }
2458
2459         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2460         req->data = unit;
2461         req->handler = zfcp_fsf_send_fcp_command_handler;
2462         req->qtcb->header.lun_handle = unit->handle;
2463         req->qtcb->header.port_handle = unit->port->handle;
2464         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2465         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2466         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2467                                                 sizeof(u32);
2468
2469         sbale = zfcp_qdio_sbale_req(req);
2470         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2471         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2472
2473         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2474         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2475         fcp_cmnd_iu->task_management_flags = tm_flags;
2476
2477         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2478         if (!zfcp_fsf_req_send(req))
2479                 goto out;
2480
2481         zfcp_fsf_req_free(req);
2482         req = NULL;
2483 out:
2484         spin_unlock(&adapter->req_q_lock);
2485         return req;
2486 }
2487
2488 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2489 {
2490         if (req->qtcb->header.fsf_status != FSF_GOOD)
2491                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2492 }
2493
2494 /**
2495  * zfcp_fsf_control_file - control file upload/download
2496  * @adapter: pointer to struct zfcp_adapter
2497  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2498  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2499  */
2500 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2501                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2502 {
2503         struct qdio_buffer_element *sbale;
2504         struct zfcp_fsf_req *req = NULL;
2505         struct fsf_qtcb_bottom_support *bottom;
2506         int direction, retval = -EIO, bytes;
2507
2508         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2509                 return ERR_PTR(-EOPNOTSUPP);
2510
2511         switch (fsf_cfdc->command) {
2512         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2513                 direction = SBAL_FLAGS0_TYPE_WRITE;
2514                 break;
2515         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2516                 direction = SBAL_FLAGS0_TYPE_READ;
2517                 break;
2518         default:
2519                 return ERR_PTR(-EINVAL);
2520         }
2521
2522         spin_lock_bh(&adapter->req_q_lock);
2523         if (zfcp_fsf_req_sbal_get(adapter))
2524                 goto out;
2525
2526         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2527         if (IS_ERR(req)) {
2528                 retval = -EPERM;
2529                 goto out;
2530         }
2531
2532         req->handler = zfcp_fsf_control_file_handler;
2533
2534         sbale = zfcp_qdio_sbale_req(req);
2535         sbale[0].flags |= direction;
2536
2537         bottom = &req->qtcb->bottom.support;
2538         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2539         bottom->option = fsf_cfdc->option;
2540
2541         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2542                                         FSF_MAX_SBALS_PER_REQ);
2543         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2544                 retval = -ENOMEM;
2545                 zfcp_fsf_req_free(req);
2546                 goto out;
2547         }
2548
2549         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2550         retval = zfcp_fsf_req_send(req);
2551 out:
2552         spin_unlock_bh(&adapter->req_q_lock);
2553
2554         if (!retval) {
2555                 wait_event(req->completion_wq,
2556                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2557                 return req;
2558         }
2559         return ERR_PTR(retval);
2560 }