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_available(struct zfcp_adapter *adapter)
 648 {
 649         if (atomic_read(&adapter->req_q.count) > 0)
 650                 return 1;
 651         atomic_inc(&adapter->qdio_outb_full);
 652         return 0;
 653 }
 654
 655 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 656         __releases(&adapter->req_q_lock)
 657         __acquires(&adapter->req_q_lock)
 658 {
 659         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 660         long ret;
 661
 662         if (atomic_read(&req_q->count) <= -REQUEST_LIST_SIZE)
 663                 return -EIO;
 664         if (atomic_read(&req_q->count) > 0)
 665                 return 0;
 666
 667         atomic_dec(&req_q->count);
 668         spin_unlock_bh(&adapter->req_q_lock);
 669         ret = wait_event_interruptible_timeout(adapter->request_wq,
 670                                         atomic_read(&req_q->count) >= 0,
 671                                         5 * HZ);
 672         spin_lock_bh(&adapter->req_q_lock);
 673         atomic_inc(&req_q->count);
 674
 675         if (ret > 0)
 676                 return 0;
 677         if (!ret)
 678                 atomic_inc(&adapter->qdio_outb_full);
 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         adapter->req_no++;
 802
 803         return 0;
 804 }
 805
 806 /**
 807  * zfcp_fsf_status_read - send status read request
 808  * @adapter: pointer to struct zfcp_adapter
 809  * @req_flags: request flags
 810  * Returns: 0 on success, ERROR otherwise
 811  */
 812 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 813 {
 814         struct zfcp_fsf_req *req;
 815         struct fsf_status_read_buffer *sr_buf;
 816         struct qdio_buffer_element *sbale;
 817         int retval = -EIO;
 818
 819         spin_lock_bh(&adapter->req_q_lock);
 820         if (zfcp_fsf_req_sbal_get(adapter))
 821                 goto out;
 822
 823         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 824                                   ZFCP_REQ_NO_QTCB,
 825                                   adapter->pool.fsf_req_status_read);
 826         if (IS_ERR(req)) {
 827                 retval = PTR_ERR(req);
 828                 goto out;
 829         }
 830
 831         sbale = zfcp_qdio_sbale_req(req);
 832         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 833         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 834         req->sbale_curr = 2;
 835
 836         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 837         if (!sr_buf) {
 838                 retval = -ENOMEM;
 839                 goto failed_buf;
 840         }
 841         memset(sr_buf, 0, sizeof(*sr_buf));
 842         req->data = sr_buf;
 843         sbale = zfcp_qdio_sbale_curr(req);
 844         sbale->addr = (void *) sr_buf;
 845         sbale->length = sizeof(*sr_buf);
 846
 847         retval = zfcp_fsf_req_send(req);
 848         if (retval)
 849                 goto failed_req_send;
 850
 851         goto out;
 852
 853 failed_req_send:
 854         mempool_free(sr_buf, adapter->pool.data_status_read);
 855 failed_buf:
 856         zfcp_fsf_req_free(req);
 857         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 858 out:
 859         spin_unlock_bh(&adapter->req_q_lock);
 860         return retval;
 861 }
 862
 863 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 864 {
 865         struct zfcp_unit *unit = req->data;
 866         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 867
 868         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 869                 return;
 870
 871         switch (req->qtcb->header.fsf_status) {
 872         case FSF_PORT_HANDLE_NOT_VALID:
 873                 if (fsq->word[0] == fsq->word[1]) {
 874                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
 875                                                 req);
 876                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 877                 }
 878                 break;
 879         case FSF_LUN_HANDLE_NOT_VALID:
 880                 if (fsq->word[0] == fsq->word[1]) {
 881                         zfcp_erp_port_reopen(unit->port, 0, 105, req);
 882                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 883                 }
 884                 break;
 885         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 886                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 887                 break;
 888         case FSF_PORT_BOXED:
 889                 zfcp_erp_port_boxed(unit->port, 47, req);
 890                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 891                                ZFCP_STATUS_FSFREQ_RETRY;
 892                 break;
 893         case FSF_LUN_BOXED:
 894                 zfcp_erp_unit_boxed(unit, 48, req);
 895                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 896                                ZFCP_STATUS_FSFREQ_RETRY;
 897                 break;
 898         case FSF_ADAPTER_STATUS_AVAILABLE:
 899                 switch (fsq->word[0]) {
 900                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 901                         zfcp_test_link(unit->port);
 902                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 903                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 904                         break;
 905                 }
 906                 break;
 907         case FSF_GOOD:
 908                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 909                 break;
 910         }
 911 }
 912
 913 /**
 914  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 915  * @old_req_id: unsigned long
 916  * @adapter: pointer to struct zfcp_adapter
 917  * @unit: pointer to struct zfcp_unit
 918  * @req_flags: integer specifying the request flags
 919  * Returns: pointer to struct zfcp_fsf_req
 920  *
 921  * FIXME(design): should be watched by a timeout !!!
 922  */
 923
 924 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 925                                                 struct zfcp_adapter *adapter,
 926                                                 struct zfcp_unit *unit,
 927                                                 int req_flags)
 928 {
 929         struct qdio_buffer_element *sbale;
 930         struct zfcp_fsf_req *req = NULL;
 931
 932         spin_lock(&adapter->req_q_lock);
 933         if (!zfcp_fsf_sbal_available(adapter))
 934                 goto out;
 935         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 936                                   req_flags, adapter->pool.fsf_req_abort);
 937         if (IS_ERR(req)) {
 938                 req = NULL;
 939                 goto out;
 940         }
 941
 942         if (unlikely(!(atomic_read(&unit->status) &
 943                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 944                 goto out_error_free;
 945
 946         sbale = zfcp_qdio_sbale_req(req);
 947         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 948         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 949
 950         req->data = unit;
 951         req->handler = zfcp_fsf_abort_fcp_command_handler;
 952         req->qtcb->header.lun_handle = unit->handle;
 953         req->qtcb->header.port_handle = unit->port->handle;
 954         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 955
 956         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 957         if (!zfcp_fsf_req_send(req))
 958                 goto out;
 959
 960 out_error_free:
 961         zfcp_fsf_req_free(req);
 962         req = NULL;
 963 out:
 964         spin_unlock(&adapter->req_q_lock);
 965         return req;
 966 }
 967
 968 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 969 {
 970         struct zfcp_adapter *adapter = req->adapter;
 971         struct zfcp_send_ct *send_ct = req->data;
 972         struct fsf_qtcb_header *header = &req->qtcb->header;
 973
 974         send_ct->status = -EINVAL;
 975
 976         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 977                 goto skip_fsfstatus;
 978
 979         switch (header->fsf_status) {
 980         case FSF_GOOD:
 981                 zfcp_san_dbf_event_ct_response(req);
 982                 send_ct->status = 0;
 983                 break;
 984         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 985                 zfcp_fsf_class_not_supp(req);
 986                 break;
 987         case FSF_ADAPTER_STATUS_AVAILABLE:
 988                 switch (header->fsf_status_qual.word[0]){
 989                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 990                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 991                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 992                         break;
 993                 }
 994                 break;
 995         case FSF_ACCESS_DENIED:
 996                 break;
 997         case FSF_PORT_BOXED:
 998                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 999                                ZFCP_STATUS_FSFREQ_RETRY;
1000                 break;
1001         case FSF_PORT_HANDLE_NOT_VALID:
1002                 zfcp_erp_adapter_reopen(adapter, 0, 106, req);
1003         case FSF_GENERIC_COMMAND_REJECTED:
1004         case FSF_PAYLOAD_SIZE_MISMATCH:
1005         case FSF_REQUEST_SIZE_TOO_LARGE:
1006         case FSF_RESPONSE_SIZE_TOO_LARGE:
1007         case FSF_SBAL_MISMATCH:
1008                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1009                 break;
1010         }
1011
1012 skip_fsfstatus:
1013         if (send_ct->handler)
1014                 send_ct->handler(send_ct->handler_data);
1015 }
1016
1017 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1018                                        struct scatterlist *sg_req,
1019                                        struct scatterlist *sg_resp,
1020                                        int max_sbals)
1021 {
1022         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(req);
1023         u32 feat = req->adapter->adapter_features;
1024         int bytes;
1025
1026         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1027                 if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
1028                     !sg_is_last(sg_req) || !sg_is_last(sg_resp))
1029                         return -EOPNOTSUPP;
1030
1031                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1032                 sbale[2].addr   = sg_virt(sg_req);
1033                 sbale[2].length = sg_req->length;
1034                 sbale[3].addr   = sg_virt(sg_resp);
1035                 sbale[3].length = sg_resp->length;
1036                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1037                 return 0;
1038         }
1039
1040         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1041                                         sg_req, max_sbals);
1042         if (bytes <= 0)
1043                 return -ENOMEM;
1044         req->qtcb->bottom.support.req_buf_length = bytes;
1045         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1046
1047         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1048                                         sg_resp, max_sbals);
1049         if (bytes <= 0)
1050                 return -ENOMEM;
1051         req->qtcb->bottom.support.resp_buf_length = bytes;
1052
1053         return 0;
1054 }
1055
1056 /**
1057  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1058  * @ct: pointer to struct zfcp_send_ct with data for request
1059  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1060  * @erp_action: if non-null the Generic Service request sent within ERP
1061  */
1062 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1063                      struct zfcp_erp_action *erp_action)
1064 {
1065         struct zfcp_wka_port *wka_port = ct->wka_port;
1066         struct zfcp_adapter *adapter = wka_port->adapter;
1067         struct zfcp_fsf_req *req;
1068         int ret = -EIO;
1069
1070         spin_lock_bh(&adapter->req_q_lock);
1071         if (zfcp_fsf_req_sbal_get(adapter))
1072                 goto out;
1073
1074         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1075                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1076         if (IS_ERR(req)) {
1077                 ret = PTR_ERR(req);
1078                 goto out;
1079         }
1080
1081         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1082                                           FSF_MAX_SBALS_PER_REQ);
1083         if (ret)
1084                 goto failed_send;
1085
1086         req->handler = zfcp_fsf_send_ct_handler;
1087         req->qtcb->header.port_handle = wka_port->handle;
1088         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1089         req->qtcb->bottom.support.timeout = ct->timeout;
1090         req->data = ct;
1091
1092         zfcp_san_dbf_event_ct_request(req);
1093
1094         if (erp_action) {
1095                 erp_action->fsf_req = req;
1096                 req->erp_action = erp_action;
1097                 zfcp_fsf_start_erp_timer(req);
1098         } else
1099                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1100
1101         ret = zfcp_fsf_req_send(req);
1102         if (ret)
1103                 goto failed_send;
1104
1105         goto out;
1106
1107 failed_send:
1108         zfcp_fsf_req_free(req);
1109         if (erp_action)
1110                 erp_action->fsf_req = NULL;
1111 out:
1112         spin_unlock_bh(&adapter->req_q_lock);
1113         return ret;
1114 }
1115
1116 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1117 {
1118         struct zfcp_send_els *send_els = req->data;
1119         struct zfcp_port *port = send_els->port;
1120         struct fsf_qtcb_header *header = &req->qtcb->header;
1121
1122         send_els->status = -EINVAL;
1123
1124         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1125                 goto skip_fsfstatus;
1126
1127         switch (header->fsf_status) {
1128         case FSF_GOOD:
1129                 zfcp_san_dbf_event_els_response(req);
1130                 send_els->status = 0;
1131                 break;
1132         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1133                 zfcp_fsf_class_not_supp(req);
1134                 break;
1135         case FSF_ADAPTER_STATUS_AVAILABLE:
1136                 switch (header->fsf_status_qual.word[0]){
1137                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1138                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1139                                 zfcp_test_link(port);
1140                         /*fall through */
1141                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1142                 case FSF_SQ_RETRY_IF_POSSIBLE:
1143                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1144                         break;
1145                 }
1146                 break;
1147         case FSF_ELS_COMMAND_REJECTED:
1148         case FSF_PAYLOAD_SIZE_MISMATCH:
1149         case FSF_REQUEST_SIZE_TOO_LARGE:
1150         case FSF_RESPONSE_SIZE_TOO_LARGE:
1151                 break;
1152         case FSF_ACCESS_DENIED:
1153                 zfcp_fsf_access_denied_port(req, port);
1154                 break;
1155         case FSF_SBAL_MISMATCH:
1156                 /* should never occure, avoided in zfcp_fsf_send_els */
1157                 /* fall through */
1158         default:
1159                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1160                 break;
1161         }
1162 skip_fsfstatus:
1163         if (send_els->handler)
1164                 send_els->handler(send_els->handler_data);
1165 }
1166
1167 /**
1168  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1169  * @els: pointer to struct zfcp_send_els with data for the command
1170  */
1171 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1172 {
1173         struct zfcp_fsf_req *req;
1174         struct zfcp_adapter *adapter = els->adapter;
1175         struct fsf_qtcb_bottom_support *bottom;
1176         int ret = -EIO;
1177
1178         if (unlikely(!(atomic_read(&els->port->status) &
1179                        ZFCP_STATUS_COMMON_UNBLOCKED)))
1180                 return -EBUSY;
1181
1182         spin_lock(&adapter->req_q_lock);
1183         if (!zfcp_fsf_sbal_available(adapter))
1184                 goto out;
1185         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1186                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1187         if (IS_ERR(req)) {
1188                 ret = PTR_ERR(req);
1189                 goto out;
1190         }
1191
1192         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1193
1194         if (ret)
1195                 goto failed_send;
1196
1197         bottom = &req->qtcb->bottom.support;
1198         req->handler = zfcp_fsf_send_els_handler;
1199         bottom->d_id = els->d_id;
1200         bottom->service_class = FSF_CLASS_3;
1201         bottom->timeout = 2 * R_A_TOV;
1202         req->data = els;
1203
1204         zfcp_san_dbf_event_els_request(req);
1205
1206         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1207         ret = zfcp_fsf_req_send(req);
1208         if (ret)
1209                 goto failed_send;
1210
1211         goto out;
1212
1213 failed_send:
1214         zfcp_fsf_req_free(req);
1215 out:
1216         spin_unlock(&adapter->req_q_lock);
1217         return ret;
1218 }
1219
1220 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1221 {
1222         struct qdio_buffer_element *sbale;
1223         struct zfcp_fsf_req *req;
1224         struct zfcp_adapter *adapter = erp_action->adapter;
1225         int retval = -EIO;
1226
1227         spin_lock_bh(&adapter->req_q_lock);
1228         if (!zfcp_fsf_sbal_available(adapter))
1229                 goto out;
1230         req = zfcp_fsf_req_create(adapter,
1231                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1232                                   ZFCP_REQ_AUTO_CLEANUP,
1233                                   adapter->pool.fsf_req_erp);
1234         if (IS_ERR(req)) {
1235                 retval = PTR_ERR(req);
1236                 goto out;
1237         }
1238
1239         sbale = zfcp_qdio_sbale_req(req);
1240         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1241         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1242
1243         req->qtcb->bottom.config.feature_selection =
1244                         FSF_FEATURE_CFDC |
1245                         FSF_FEATURE_LUN_SHARING |
1246                         FSF_FEATURE_NOTIFICATION_LOST |
1247                         FSF_FEATURE_UPDATE_ALERT;
1248         req->erp_action = erp_action;
1249         req->handler = zfcp_fsf_exchange_config_data_handler;
1250         erp_action->fsf_req = req;
1251
1252         zfcp_fsf_start_erp_timer(req);
1253         retval = zfcp_fsf_req_send(req);
1254         if (retval) {
1255                 zfcp_fsf_req_free(req);
1256                 erp_action->fsf_req = NULL;
1257         }
1258 out:
1259         spin_unlock_bh(&adapter->req_q_lock);
1260         return retval;
1261 }
1262
1263 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1264                                        struct fsf_qtcb_bottom_config *data)
1265 {
1266         struct qdio_buffer_element *sbale;
1267         struct zfcp_fsf_req *req = NULL;
1268         int retval = -EIO;
1269
1270         spin_lock_bh(&adapter->req_q_lock);
1271         if (zfcp_fsf_req_sbal_get(adapter))
1272                 goto out;
1273
1274         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1275                                   0, NULL);
1276         if (IS_ERR(req)) {
1277                 retval = PTR_ERR(req);
1278                 goto out;
1279         }
1280
1281         sbale = zfcp_qdio_sbale_req(req);
1282         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1283         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1284         req->handler = zfcp_fsf_exchange_config_data_handler;
1285
1286         req->qtcb->bottom.config.feature_selection =
1287                         FSF_FEATURE_CFDC |
1288                         FSF_FEATURE_LUN_SHARING |
1289                         FSF_FEATURE_NOTIFICATION_LOST |
1290                         FSF_FEATURE_UPDATE_ALERT;
1291
1292         if (data)
1293                 req->data = data;
1294
1295         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1296         retval = zfcp_fsf_req_send(req);
1297 out:
1298         spin_unlock_bh(&adapter->req_q_lock);
1299         if (!retval)
1300                 wait_event(req->completion_wq,
1301                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1302
1303         zfcp_fsf_req_free(req);
1304
1305         return retval;
1306 }
1307
1308 /**
1309  * zfcp_fsf_exchange_port_data - request information about local port
1310  * @erp_action: ERP action for the adapter for which port data is requested
1311  * Returns: 0 on success, error otherwise
1312  */
1313 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1314 {
1315         struct qdio_buffer_element *sbale;
1316         struct zfcp_fsf_req *req;
1317         struct zfcp_adapter *adapter = erp_action->adapter;
1318         int retval = -EIO;
1319
1320         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1321                 return -EOPNOTSUPP;
1322
1323         spin_lock_bh(&adapter->req_q_lock);
1324         if (!zfcp_fsf_sbal_available(adapter))
1325                 goto out;
1326         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1327                                   ZFCP_REQ_AUTO_CLEANUP,
1328                                   adapter->pool.fsf_req_erp);
1329         if (IS_ERR(req)) {
1330                 retval = PTR_ERR(req);
1331                 goto out;
1332         }
1333
1334         sbale = zfcp_qdio_sbale_req(req);
1335         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1336         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1337
1338         req->handler = zfcp_fsf_exchange_port_data_handler;
1339         req->erp_action = erp_action;
1340         erp_action->fsf_req = req;
1341
1342         zfcp_fsf_start_erp_timer(req);
1343         retval = zfcp_fsf_req_send(req);
1344         if (retval) {
1345                 zfcp_fsf_req_free(req);
1346                 erp_action->fsf_req = NULL;
1347         }
1348 out:
1349         spin_unlock_bh(&adapter->req_q_lock);
1350         return retval;
1351 }
1352
1353 /**
1354  * zfcp_fsf_exchange_port_data_sync - request information about local port
1355  * @adapter: pointer to struct zfcp_adapter
1356  * @data: pointer to struct fsf_qtcb_bottom_port
1357  * Returns: 0 on success, error otherwise
1358  */
1359 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1360                                      struct fsf_qtcb_bottom_port *data)
1361 {
1362         struct qdio_buffer_element *sbale;
1363         struct zfcp_fsf_req *req = NULL;
1364         int retval = -EIO;
1365
1366         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1367                 return -EOPNOTSUPP;
1368
1369         spin_lock_bh(&adapter->req_q_lock);
1370         if (!zfcp_fsf_sbal_available(adapter))
1371                 goto out;
1372
1373         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1374                                   NULL);
1375         if (IS_ERR(req)) {
1376                 retval = PTR_ERR(req);
1377                 goto out;
1378         }
1379
1380         if (data)
1381                 req->data = data;
1382
1383         sbale = zfcp_qdio_sbale_req(req);
1384         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1385         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1386
1387         req->handler = zfcp_fsf_exchange_port_data_handler;
1388         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1389         retval = zfcp_fsf_req_send(req);
1390 out:
1391         spin_unlock_bh(&adapter->req_q_lock);
1392         if (!retval)
1393                 wait_event(req->completion_wq,
1394                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1395         zfcp_fsf_req_free(req);
1396
1397         return retval;
1398 }
1399
1400 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1401 {
1402         struct zfcp_port *port = req->data;
1403         struct fsf_qtcb_header *header = &req->qtcb->header;
1404         struct fsf_plogi *plogi;
1405
1406         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1407                 return;
1408
1409         switch (header->fsf_status) {
1410         case FSF_PORT_ALREADY_OPEN:
1411                 break;
1412         case FSF_ACCESS_DENIED:
1413                 zfcp_fsf_access_denied_port(req, port);
1414                 break;
1415         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1416                 dev_warn(&req->adapter->ccw_device->dev,
1417                          "Not enough FCP adapter resources to open "
1418                          "remote port 0x%016Lx\n",
1419                          (unsigned long long)port->wwpn);
1420                 zfcp_erp_port_failed(port, 31, req);
1421                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1422                 break;
1423         case FSF_ADAPTER_STATUS_AVAILABLE:
1424                 switch (header->fsf_status_qual.word[0]) {
1425                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1426                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1427                 case FSF_SQ_NO_RETRY_POSSIBLE:
1428                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1429                         break;
1430                 }
1431                 break;
1432         case FSF_GOOD:
1433                 port->handle = header->port_handle;
1434                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1435                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1436                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1437                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1438                                   &port->status);
1439                 /* check whether D_ID has changed during open */
1440                 /*
1441                  * FIXME: This check is not airtight, as the FCP channel does
1442                  * not monitor closures of target port connections caused on
1443                  * the remote side. Thus, they might miss out on invalidating
1444                  * locally cached WWPNs (and other N_Port parameters) of gone
1445                  * target ports. So, our heroic attempt to make things safe
1446                  * could be undermined by 'open port' response data tagged with
1447                  * obsolete WWPNs. Another reason to monitor potential
1448                  * connection closures ourself at least (by interpreting
1449                  * incoming ELS' and unsolicited status). It just crosses my
1450                  * mind that one should be able to cross-check by means of
1451                  * another GID_PN straight after a port has been opened.
1452                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1453                  */
1454                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1455                 if (req->qtcb->bottom.support.els1_length >=
1456                     FSF_PLOGI_MIN_LEN) {
1457                         if (plogi->serv_param.wwpn != port->wwpn)
1458                                 port->d_id = 0;
1459                         else {
1460                                 port->wwnn = plogi->serv_param.wwnn;
1461                                 zfcp_fc_plogi_evaluate(port, plogi);
1462                         }
1463                 }
1464                 break;
1465         case FSF_UNKNOWN_OP_SUBTYPE:
1466                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1467                 break;
1468         }
1469 }
1470
1471 /**
1472  * zfcp_fsf_open_port - create and send open port request
1473  * @erp_action: pointer to struct zfcp_erp_action
1474  * Returns: 0 on success, error otherwise
1475  */
1476 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1477 {
1478         struct qdio_buffer_element *sbale;
1479         struct zfcp_adapter *adapter = erp_action->adapter;
1480         struct zfcp_fsf_req *req;
1481         int retval = -EIO;
1482
1483         spin_lock_bh(&adapter->req_q_lock);
1484         if (zfcp_fsf_req_sbal_get(adapter))
1485                 goto out;
1486
1487         req = zfcp_fsf_req_create(adapter,
1488                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1489                                   ZFCP_REQ_AUTO_CLEANUP,
1490                                   adapter->pool.fsf_req_erp);
1491         if (IS_ERR(req)) {
1492                 retval = PTR_ERR(req);
1493                 goto out;
1494         }
1495
1496         sbale = zfcp_qdio_sbale_req(req);
1497         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1498         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1499
1500         req->handler = zfcp_fsf_open_port_handler;
1501         req->qtcb->bottom.support.d_id = erp_action->port->d_id;
1502         req->data = erp_action->port;
1503         req->erp_action = erp_action;
1504         erp_action->fsf_req = req;
1505
1506         zfcp_fsf_start_erp_timer(req);
1507         retval = zfcp_fsf_req_send(req);
1508         if (retval) {
1509                 zfcp_fsf_req_free(req);
1510                 erp_action->fsf_req = NULL;
1511         }
1512 out:
1513         spin_unlock_bh(&adapter->req_q_lock);
1514         return retval;
1515 }
1516
1517 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1518 {
1519         struct zfcp_port *port = req->data;
1520
1521         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1522                 return;
1523
1524         switch (req->qtcb->header.fsf_status) {
1525         case FSF_PORT_HANDLE_NOT_VALID:
1526                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, req);
1527                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1528                 break;
1529         case FSF_ADAPTER_STATUS_AVAILABLE:
1530                 break;
1531         case FSF_GOOD:
1532                 zfcp_erp_modify_port_status(port, 33, req,
1533                                             ZFCP_STATUS_COMMON_OPEN,
1534                                             ZFCP_CLEAR);
1535                 break;
1536         }
1537 }
1538
1539 /**
1540  * zfcp_fsf_close_port - create and send close port request
1541  * @erp_action: pointer to struct zfcp_erp_action
1542  * Returns: 0 on success, error otherwise
1543  */
1544 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1545 {
1546         struct qdio_buffer_element *sbale;
1547         struct zfcp_adapter *adapter = erp_action->adapter;
1548         struct zfcp_fsf_req *req;
1549         int retval = -EIO;
1550
1551         spin_lock_bh(&adapter->req_q_lock);
1552         if (zfcp_fsf_req_sbal_get(adapter))
1553                 goto out;
1554
1555         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1556                                   ZFCP_REQ_AUTO_CLEANUP,
1557                                   adapter->pool.fsf_req_erp);
1558         if (IS_ERR(req)) {
1559                 retval = PTR_ERR(req);
1560                 goto out;
1561         }
1562
1563         sbale = zfcp_qdio_sbale_req(req);
1564         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1565         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1566
1567         req->handler = zfcp_fsf_close_port_handler;
1568         req->data = erp_action->port;
1569         req->erp_action = erp_action;
1570         req->qtcb->header.port_handle = erp_action->port->handle;
1571         erp_action->fsf_req = req;
1572
1573         zfcp_fsf_start_erp_timer(req);
1574         retval = zfcp_fsf_req_send(req);
1575         if (retval) {
1576                 zfcp_fsf_req_free(req);
1577                 erp_action->fsf_req = NULL;
1578         }
1579 out:
1580         spin_unlock_bh(&adapter->req_q_lock);
1581         return retval;
1582 }
1583
1584 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1585 {
1586         struct zfcp_wka_port *wka_port = req->data;
1587         struct fsf_qtcb_header *header = &req->qtcb->header;
1588
1589         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1590                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1591                 goto out;
1592         }
1593
1594         switch (header->fsf_status) {
1595         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1596                 dev_warn(&req->adapter->ccw_device->dev,
1597                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1598         case FSF_ADAPTER_STATUS_AVAILABLE:
1599                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1600         case FSF_ACCESS_DENIED:
1601                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1602                 break;
1603         case FSF_PORT_ALREADY_OPEN:
1604                 break;
1605         case FSF_GOOD:
1606                 wka_port->handle = header->port_handle;
1607                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1608         }
1609 out:
1610         wake_up(&wka_port->completion_wq);
1611 }
1612
1613 /**
1614  * zfcp_fsf_open_wka_port - create and send open wka-port request
1615  * @wka_port: pointer to struct zfcp_wka_port
1616  * Returns: 0 on success, error otherwise
1617  */
1618 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1619 {
1620         struct qdio_buffer_element *sbale;
1621         struct zfcp_adapter *adapter = wka_port->adapter;
1622         struct zfcp_fsf_req *req;
1623         int retval = -EIO;
1624
1625         spin_lock_bh(&adapter->req_q_lock);
1626         if (zfcp_fsf_req_sbal_get(adapter))
1627                 goto out;
1628
1629         req = zfcp_fsf_req_create(adapter,
1630                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1631                                   ZFCP_REQ_AUTO_CLEANUP,
1632                                   adapter->pool.fsf_req_erp);
1633         if (unlikely(IS_ERR(req))) {
1634                 retval = PTR_ERR(req);
1635                 goto out;
1636         }
1637
1638         sbale = zfcp_qdio_sbale_req(req);
1639         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1640         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1641
1642         req->handler = zfcp_fsf_open_wka_port_handler;
1643         req->qtcb->bottom.support.d_id = wka_port->d_id;
1644         req->data = wka_port;
1645
1646         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1647         retval = zfcp_fsf_req_send(req);
1648         if (retval)
1649                 zfcp_fsf_req_free(req);
1650 out:
1651         spin_unlock_bh(&adapter->req_q_lock);
1652         return retval;
1653 }
1654
1655 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1656 {
1657         struct zfcp_wka_port *wka_port = req->data;
1658
1659         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1660                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1661                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, 84, req);
1662         }
1663
1664         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1665         wake_up(&wka_port->completion_wq);
1666 }
1667
1668 /**
1669  * zfcp_fsf_close_wka_port - create and send close wka port request
1670  * @erp_action: pointer to struct zfcp_erp_action
1671  * Returns: 0 on success, error otherwise
1672  */
1673 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1674 {
1675         struct qdio_buffer_element *sbale;
1676         struct zfcp_adapter *adapter = wka_port->adapter;
1677         struct zfcp_fsf_req *req;
1678         int retval = -EIO;
1679
1680         spin_lock_bh(&adapter->req_q_lock);
1681         if (zfcp_fsf_req_sbal_get(adapter))
1682                 goto out;
1683
1684         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1685                                   ZFCP_REQ_AUTO_CLEANUP,
1686                                   adapter->pool.fsf_req_erp);
1687         if (unlikely(IS_ERR(req))) {
1688                 retval = PTR_ERR(req);
1689                 goto out;
1690         }
1691
1692         sbale = zfcp_qdio_sbale_req(req);
1693         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1694         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1695
1696         req->handler = zfcp_fsf_close_wka_port_handler;
1697         req->data = wka_port;
1698         req->qtcb->header.port_handle = wka_port->handle;
1699
1700         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1701         retval = zfcp_fsf_req_send(req);
1702         if (retval)
1703                 zfcp_fsf_req_free(req);
1704 out:
1705         spin_unlock_bh(&adapter->req_q_lock);
1706         return retval;
1707 }
1708
1709 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1710 {
1711         struct zfcp_port *port = req->data;
1712         struct fsf_qtcb_header *header = &req->qtcb->header;
1713         struct zfcp_unit *unit;
1714
1715         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1716                 return;
1717
1718         switch (header->fsf_status) {
1719         case FSF_PORT_HANDLE_NOT_VALID:
1720                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, req);
1721                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1722                 break;
1723         case FSF_ACCESS_DENIED:
1724                 zfcp_fsf_access_denied_port(req, port);
1725                 break;
1726         case FSF_PORT_BOXED:
1727                 zfcp_erp_port_boxed(port, 50, req);
1728                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1729                                ZFCP_STATUS_FSFREQ_RETRY;
1730                 /* can't use generic zfcp_erp_modify_port_status because
1731                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1732                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1733                 list_for_each_entry(unit, &port->unit_list_head, list)
1734                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1735                                           &unit->status);
1736                 break;
1737         case FSF_ADAPTER_STATUS_AVAILABLE:
1738                 switch (header->fsf_status_qual.word[0]) {
1739                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1740                         /* fall through */
1741                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1742                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1743                         break;
1744                 }
1745                 break;
1746         case FSF_GOOD:
1747                 /* can't use generic zfcp_erp_modify_port_status because
1748                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1749                  */
1750                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1751                 list_for_each_entry(unit, &port->unit_list_head, list)
1752                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1753                                           &unit->status);
1754                 break;
1755         }
1756 }
1757
1758 /**
1759  * zfcp_fsf_close_physical_port - close physical port
1760  * @erp_action: pointer to struct zfcp_erp_action
1761  * Returns: 0 on success
1762  */
1763 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1764 {
1765         struct qdio_buffer_element *sbale;
1766         struct zfcp_adapter *adapter = erp_action->adapter;
1767         struct zfcp_fsf_req *req;
1768         int retval = -EIO;
1769
1770         spin_lock_bh(&adapter->req_q_lock);
1771         if (zfcp_fsf_req_sbal_get(adapter))
1772                 goto out;
1773
1774         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1775                                   ZFCP_REQ_AUTO_CLEANUP,
1776                                   adapter->pool.fsf_req_erp);
1777         if (IS_ERR(req)) {
1778                 retval = PTR_ERR(req);
1779                 goto out;
1780         }
1781
1782         sbale = zfcp_qdio_sbale_req(req);
1783         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1784         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1785
1786         req->data = erp_action->port;
1787         req->qtcb->header.port_handle = erp_action->port->handle;
1788         req->erp_action = erp_action;
1789         req->handler = zfcp_fsf_close_physical_port_handler;
1790         erp_action->fsf_req = req;
1791
1792         zfcp_fsf_start_erp_timer(req);
1793         retval = zfcp_fsf_req_send(req);
1794         if (retval) {
1795                 zfcp_fsf_req_free(req);
1796                 erp_action->fsf_req = NULL;
1797         }
1798 out:
1799         spin_unlock_bh(&adapter->req_q_lock);
1800         return retval;
1801 }
1802
1803 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1804 {
1805         struct zfcp_adapter *adapter = req->adapter;
1806         struct zfcp_unit *unit = req->data;
1807         struct fsf_qtcb_header *header = &req->qtcb->header;
1808         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1809         struct fsf_queue_designator *queue_designator =
1810                                 &header->fsf_status_qual.fsf_queue_designator;
1811         int exclusive, readwrite;
1812
1813         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1814                 return;
1815
1816         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1817                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1818                           ZFCP_STATUS_UNIT_SHARED |
1819                           ZFCP_STATUS_UNIT_READONLY,
1820                           &unit->status);
1821
1822         switch (header->fsf_status) {
1823
1824         case FSF_PORT_HANDLE_NOT_VALID:
1825                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, req);
1826                 /* fall through */
1827         case FSF_LUN_ALREADY_OPEN:
1828                 break;
1829         case FSF_ACCESS_DENIED:
1830                 zfcp_fsf_access_denied_unit(req, unit);
1831                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1832                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1833                 break;
1834         case FSF_PORT_BOXED:
1835                 zfcp_erp_port_boxed(unit->port, 51, req);
1836                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1837                                ZFCP_STATUS_FSFREQ_RETRY;
1838                 break;
1839         case FSF_LUN_SHARING_VIOLATION:
1840                 if (header->fsf_status_qual.word[0])
1841                         dev_warn(&adapter->ccw_device->dev,
1842                                  "LUN 0x%Lx on port 0x%Lx is already in "
1843                                  "use by CSS%d, MIF Image ID %x\n",
1844                                  (unsigned long long)unit->fcp_lun,
1845                                  (unsigned long long)unit->port->wwpn,
1846                                  queue_designator->cssid,
1847                                  queue_designator->hla);
1848                 else
1849                         zfcp_act_eval_err(adapter,
1850                                           header->fsf_status_qual.word[2]);
1851                 zfcp_erp_unit_access_denied(unit, 60, req);
1852                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1853                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1854                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1855                 break;
1856         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1857                 dev_warn(&adapter->ccw_device->dev,
1858                          "No handle is available for LUN "
1859                          "0x%016Lx on port 0x%016Lx\n",
1860                          (unsigned long long)unit->fcp_lun,
1861                          (unsigned long long)unit->port->wwpn);
1862                 zfcp_erp_unit_failed(unit, 34, req);
1863                 /* fall through */
1864         case FSF_INVALID_COMMAND_OPTION:
1865                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1866                 break;
1867         case FSF_ADAPTER_STATUS_AVAILABLE:
1868                 switch (header->fsf_status_qual.word[0]) {
1869                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1870                         zfcp_test_link(unit->port);
1871                         /* fall through */
1872                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1873                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1874                         break;
1875                 }
1876                 break;
1877
1878         case FSF_GOOD:
1879                 unit->handle = header->lun_handle;
1880                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1881
1882                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1883                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1884                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1885                         exclusive = (bottom->lun_access_info &
1886                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1887                         readwrite = (bottom->lun_access_info &
1888                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1889
1890                         if (!exclusive)
1891                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1892                                                 &unit->status);
1893
1894                         if (!readwrite) {
1895                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1896                                                 &unit->status);
1897                                 dev_info(&adapter->ccw_device->dev,
1898                                          "SCSI device at LUN 0x%016Lx on port "
1899                                          "0x%016Lx opened read-only\n",
1900                                          (unsigned long long)unit->fcp_lun,
1901                                          (unsigned long long)unit->port->wwpn);
1902                         }
1903
1904                         if (exclusive && !readwrite) {
1905                                 dev_err(&adapter->ccw_device->dev,
1906                                         "Exclusive read-only access not "
1907                                         "supported (unit 0x%016Lx, "
1908                                         "port 0x%016Lx)\n",
1909                                         (unsigned long long)unit->fcp_lun,
1910                                         (unsigned long long)unit->port->wwpn);
1911                                 zfcp_erp_unit_failed(unit, 35, req);
1912                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1913                                 zfcp_erp_unit_shutdown(unit, 0, 80, req);
1914                         } else if (!exclusive && readwrite) {
1915                                 dev_err(&adapter->ccw_device->dev,
1916                                         "Shared read-write access not "
1917                                         "supported (unit 0x%016Lx, port "
1918                                         "0x%016Lx)\n",
1919                                         (unsigned long long)unit->fcp_lun,
1920                                         (unsigned long long)unit->port->wwpn);
1921                                 zfcp_erp_unit_failed(unit, 36, req);
1922                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1923                                 zfcp_erp_unit_shutdown(unit, 0, 81, req);
1924                         }
1925                 }
1926                 break;
1927         }
1928 }
1929
1930 /**
1931  * zfcp_fsf_open_unit - open unit
1932  * @erp_action: pointer to struct zfcp_erp_action
1933  * Returns: 0 on success, error otherwise
1934  */
1935 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1936 {
1937         struct qdio_buffer_element *sbale;
1938         struct zfcp_adapter *adapter = erp_action->adapter;
1939         struct zfcp_fsf_req *req;
1940         int retval = -EIO;
1941
1942         spin_lock_bh(&adapter->req_q_lock);
1943         if (zfcp_fsf_req_sbal_get(adapter))
1944                 goto out;
1945
1946         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1947                                   ZFCP_REQ_AUTO_CLEANUP,
1948                                   adapter->pool.fsf_req_erp);
1949         if (IS_ERR(req)) {
1950                 retval = PTR_ERR(req);
1951                 goto out;
1952         }
1953
1954         sbale = zfcp_qdio_sbale_req(req);
1955         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1956         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1957
1958         req->qtcb->header.port_handle = erp_action->port->handle;
1959         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1960         req->handler = zfcp_fsf_open_unit_handler;
1961         req->data = erp_action->unit;
1962         req->erp_action = erp_action;
1963         erp_action->fsf_req = req;
1964
1965         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1966                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1967
1968         zfcp_fsf_start_erp_timer(req);
1969         retval = zfcp_fsf_req_send(req);
1970         if (retval) {
1971                 zfcp_fsf_req_free(req);
1972                 erp_action->fsf_req = NULL;
1973         }
1974 out:
1975         spin_unlock_bh(&adapter->req_q_lock);
1976         return retval;
1977 }
1978
1979 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1980 {
1981         struct zfcp_unit *unit = req->data;
1982
1983         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1984                 return;
1985
1986         switch (req->qtcb->header.fsf_status) {
1987         case FSF_PORT_HANDLE_NOT_VALID:
1988                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, req);
1989                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1990                 break;
1991         case FSF_LUN_HANDLE_NOT_VALID:
1992                 zfcp_erp_port_reopen(unit->port, 0, 111, req);
1993                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1994                 break;
1995         case FSF_PORT_BOXED:
1996                 zfcp_erp_port_boxed(unit->port, 52, req);
1997                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1998                                ZFCP_STATUS_FSFREQ_RETRY;
1999                 break;
2000         case FSF_ADAPTER_STATUS_AVAILABLE:
2001                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
2002                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2003                         zfcp_test_link(unit->port);
2004                         /* fall through */
2005                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2006                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2007                         break;
2008                 }
2009                 break;
2010         case FSF_GOOD:
2011                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2012                 break;
2013         }
2014 }
2015
2016 /**
2017  * zfcp_fsf_close_unit - close zfcp unit
2018  * @erp_action: pointer to struct zfcp_unit
2019  * Returns: 0 on success, error otherwise
2020  */
2021 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2022 {
2023         struct qdio_buffer_element *sbale;
2024         struct zfcp_adapter *adapter = erp_action->adapter;
2025         struct zfcp_fsf_req *req;
2026         int retval = -EIO;
2027
2028         spin_lock_bh(&adapter->req_q_lock);
2029         if (zfcp_fsf_req_sbal_get(adapter))
2030                 goto out;
2031         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2032                                   ZFCP_REQ_AUTO_CLEANUP,
2033                                   adapter->pool.fsf_req_erp);
2034         if (IS_ERR(req)) {
2035                 retval = PTR_ERR(req);
2036                 goto out;
2037         }
2038
2039         sbale = zfcp_qdio_sbale_req(req);
2040         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2041         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2042
2043         req->qtcb->header.port_handle = erp_action->port->handle;
2044         req->qtcb->header.lun_handle = erp_action->unit->handle;
2045         req->handler = zfcp_fsf_close_unit_handler;
2046         req->data = erp_action->unit;
2047         req->erp_action = erp_action;
2048         erp_action->fsf_req = req;
2049
2050         zfcp_fsf_start_erp_timer(req);
2051         retval = zfcp_fsf_req_send(req);
2052         if (retval) {
2053                 zfcp_fsf_req_free(req);
2054                 erp_action->fsf_req = NULL;
2055         }
2056 out:
2057         spin_unlock_bh(&adapter->req_q_lock);
2058         return retval;
2059 }
2060
2061 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2062 {
2063         lat_rec->sum += lat;
2064         lat_rec->min = min(lat_rec->min, lat);
2065         lat_rec->max = max(lat_rec->max, lat);
2066 }
2067
2068 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2069 {
2070         struct fsf_qual_latency_info *lat_inf;
2071         struct latency_cont *lat;
2072         struct zfcp_unit *unit = req->unit;
2073
2074         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2075
2076         switch (req->qtcb->bottom.io.data_direction) {
2077         case FSF_DATADIR_READ:
2078                 lat = &unit->latencies.read;
2079                 break;
2080         case FSF_DATADIR_WRITE:
2081                 lat = &unit->latencies.write;
2082                 break;
2083         case FSF_DATADIR_CMND:
2084                 lat = &unit->latencies.cmd;
2085                 break;
2086         default:
2087                 return;
2088         }
2089
2090         spin_lock(&unit->latencies.lock);
2091         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2092         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2093         lat->counter++;
2094         spin_unlock(&unit->latencies.lock);
2095 }
2096
2097 #ifdef CONFIG_BLK_DEV_IO_TRACE
2098 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2099 {
2100         struct fsf_qual_latency_info *lat_inf;
2101         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2102         struct request *req = scsi_cmnd->request;
2103         struct zfcp_blk_drv_data trace;
2104         int ticks = fsf_req->adapter->timer_ticks;
2105
2106         trace.flags = 0;
2107         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2108         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2109                 trace.flags |= ZFCP_BLK_LAT_VALID;
2110                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2111                 trace.channel_lat = lat_inf->channel_lat * ticks;
2112                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2113         }
2114         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2115                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2116         trace.inb_usage = fsf_req->qdio_inb_usage;
2117         trace.outb_usage = fsf_req->qdio_outb_usage;
2118
2119         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2120 }
2121 #else
2122 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2123 {
2124 }
2125 #endif
2126
2127 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2128 {
2129         struct scsi_cmnd *scpnt;
2130         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2131             &(req->qtcb->bottom.io.fcp_rsp);
2132         u32 sns_len;
2133         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2134         unsigned long flags;
2135
2136         read_lock_irqsave(&req->adapter->abort_lock, flags);
2137
2138         scpnt = req->data;
2139         if (unlikely(!scpnt)) {
2140                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2141                 return;
2142         }
2143
2144         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2145                 set_host_byte(scpnt, DID_SOFT_ERROR);
2146                 goto skip_fsfstatus;
2147         }
2148
2149         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2150                 set_host_byte(scpnt, DID_ERROR);
2151                 goto skip_fsfstatus;
2152         }
2153
2154         set_msg_byte(scpnt, COMMAND_COMPLETE);
2155
2156         scpnt->result |= fcp_rsp_iu->scsi_status;
2157
2158         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2159                 zfcp_fsf_req_latency(req);
2160
2161         zfcp_fsf_trace_latency(req);
2162
2163         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2164                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2165                         set_host_byte(scpnt, DID_OK);
2166                 else {
2167                         set_host_byte(scpnt, DID_ERROR);
2168                         goto skip_fsfstatus;
2169                 }
2170         }
2171
2172         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2173                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2174                           fcp_rsp_iu->fcp_rsp_len;
2175                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2176                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2177
2178                 memcpy(scpnt->sense_buffer,
2179                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2180         }
2181
2182         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2183                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2184                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2185                     scpnt->underflow)
2186                         set_host_byte(scpnt, DID_ERROR);
2187         }
2188 skip_fsfstatus:
2189         if (scpnt->result != 0)
2190                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2191         else if (scpnt->retries > 0)
2192                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2193         else
2194                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2195
2196         scpnt->host_scribble = NULL;
2197         (scpnt->scsi_done) (scpnt);
2198         /*
2199          * We must hold this lock until scsi_done has been called.
2200          * Otherwise we may call scsi_done after abort regarding this
2201          * command has completed.
2202          * Note: scsi_done must not block!
2203          */
2204         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2205 }
2206
2207 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2208 {
2209         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2210             &(req->qtcb->bottom.io.fcp_rsp);
2211         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2212
2213         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2214              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2215                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2216 }
2217
2218
2219 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2220 {
2221         struct zfcp_unit *unit;
2222         struct fsf_qtcb_header *header = &req->qtcb->header;
2223
2224         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2225                 unit = req->data;
2226         else
2227                 unit = req->unit;
2228
2229         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2230                 goto skip_fsfstatus;
2231
2232         switch (header->fsf_status) {
2233         case FSF_HANDLE_MISMATCH:
2234         case FSF_PORT_HANDLE_NOT_VALID:
2235                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, req);
2236                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2237                 break;
2238         case FSF_FCPLUN_NOT_VALID:
2239         case FSF_LUN_HANDLE_NOT_VALID:
2240                 zfcp_erp_port_reopen(unit->port, 0, 113, req);
2241                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2242                 break;
2243         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2244                 zfcp_fsf_class_not_supp(req);
2245                 break;
2246         case FSF_ACCESS_DENIED:
2247                 zfcp_fsf_access_denied_unit(req, unit);
2248                 break;
2249         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2250                 dev_err(&req->adapter->ccw_device->dev,
2251                         "Incorrect direction %d, unit 0x%016Lx on port "
2252                         "0x%016Lx closed\n",
2253                         req->qtcb->bottom.io.data_direction,
2254                         (unsigned long long)unit->fcp_lun,
2255                         (unsigned long long)unit->port->wwpn);
2256                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, req);
2257                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2258                 break;
2259         case FSF_CMND_LENGTH_NOT_VALID:
2260                 dev_err(&req->adapter->ccw_device->dev,
2261                         "Incorrect CDB length %d, unit 0x%016Lx on "
2262                         "port 0x%016Lx closed\n",
2263                         req->qtcb->bottom.io.fcp_cmnd_length,
2264                         (unsigned long long)unit->fcp_lun,
2265                         (unsigned long long)unit->port->wwpn);
2266                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, req);
2267                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2268                 break;
2269         case FSF_PORT_BOXED:
2270                 zfcp_erp_port_boxed(unit->port, 53, req);
2271                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2272                                ZFCP_STATUS_FSFREQ_RETRY;
2273                 break;
2274         case FSF_LUN_BOXED:
2275                 zfcp_erp_unit_boxed(unit, 54, req);
2276                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2277                                ZFCP_STATUS_FSFREQ_RETRY;
2278                 break;
2279         case FSF_ADAPTER_STATUS_AVAILABLE:
2280                 if (header->fsf_status_qual.word[0] ==
2281                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2282                         zfcp_test_link(unit->port);
2283                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2284                 break;
2285         }
2286 skip_fsfstatus:
2287         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2288                 zfcp_fsf_send_fcp_ctm_handler(req);
2289         else {
2290                 zfcp_fsf_send_fcp_command_task_handler(req);
2291                 req->unit = NULL;
2292                 zfcp_unit_put(unit);
2293         }
2294 }
2295
2296 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2297 {
2298         u32 *fcp_dl_ptr;
2299
2300         /*
2301          * fcp_dl_addr = start address of fcp_cmnd structure +
2302          * size of fixed part + size of dynamically sized add_dcp_cdb field
2303          * SEE FCP-2 documentation
2304          */
2305         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2306                         (fcp_cmd->add_fcp_cdb_length << 2));
2307         *fcp_dl_ptr = fcp_dl;
2308 }
2309
2310 /**
2311  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2312  * @adapter: adapter where scsi command is issued
2313  * @unit: unit where command is sent to
2314  * @scsi_cmnd: scsi command to be sent
2315  * @timer: timer to be started when request is initiated
2316  * @req_flags: flags for fsf_request
2317  */
2318 int zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
2319                                    struct zfcp_unit *unit,
2320                                    struct scsi_cmnd *scsi_cmnd,
2321                                    int use_timer, int req_flags)
2322 {
2323         struct zfcp_fsf_req *req;
2324         struct fcp_cmnd_iu *fcp_cmnd_iu;
2325         unsigned int sbtype;
2326         int real_bytes, retval = -EIO;
2327
2328         if (unlikely(!(atomic_read(&unit->status) &
2329                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2330                 return -EBUSY;
2331
2332         spin_lock(&adapter->req_q_lock);
2333         if (!zfcp_fsf_sbal_available(adapter))
2334                 goto out;
2335         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2336                                   adapter->pool.fsf_req_scsi);
2337         if (IS_ERR(req)) {
2338                 retval = PTR_ERR(req);
2339                 goto out;
2340         }
2341
2342         zfcp_unit_get(unit);
2343         req->unit = unit;
2344         req->data = scsi_cmnd;
2345         req->handler = zfcp_fsf_send_fcp_command_handler;
2346         req->qtcb->header.lun_handle = unit->handle;
2347         req->qtcb->header.port_handle = unit->port->handle;
2348         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2349
2350         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2351
2352         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2353         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2354         /*
2355          * set depending on data direction:
2356          *      data direction bits in SBALE (SB Type)
2357          *      data direction bits in QTCB
2358          *      data direction bits in FCP_CMND IU
2359          */
2360         switch (scsi_cmnd->sc_data_direction) {
2361         case DMA_NONE:
2362                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2363                 sbtype = SBAL_FLAGS0_TYPE_READ;
2364                 break;
2365         case DMA_FROM_DEVICE:
2366                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2367                 sbtype = SBAL_FLAGS0_TYPE_READ;
2368                 fcp_cmnd_iu->rddata = 1;
2369                 break;
2370         case DMA_TO_DEVICE:
2371                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2372                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2373                 fcp_cmnd_iu->wddata = 1;
2374                 break;
2375         case DMA_BIDIRECTIONAL:
2376         default:
2377                 retval = -EIO;
2378                 goto failed_scsi_cmnd;
2379         }
2380
2381         if (likely((scsi_cmnd->device->simple_tags) ||
2382                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2383                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2384                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2385         else
2386                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2387
2388         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2389                 fcp_cmnd_iu->add_fcp_cdb_length =
2390                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2391
2392         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2393
2394         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2395                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2396
2397         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2398                                              scsi_sglist(scsi_cmnd),
2399                                              FSF_MAX_SBALS_PER_REQ);
2400         if (unlikely(real_bytes < 0)) {
2401                 if (req->sbal_number < FSF_MAX_SBALS_PER_REQ)
2402                         retval = -EIO;
2403                 else {
2404                         dev_err(&adapter->ccw_device->dev,
2405                                 "Oversize data package, unit 0x%016Lx "
2406                                 "on port 0x%016Lx closed\n",
2407                                 (unsigned long long)unit->fcp_lun,
2408                                 (unsigned long long)unit->port->wwpn);
2409                         zfcp_erp_unit_shutdown(unit, 0, 131, req);
2410                         retval = -EINVAL;
2411                 }
2412                 goto failed_scsi_cmnd;
2413         }
2414
2415         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2416
2417         if (use_timer)
2418                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2419
2420         retval = zfcp_fsf_req_send(req);
2421         if (unlikely(retval))
2422                 goto failed_scsi_cmnd;
2423
2424         goto out;
2425
2426 failed_scsi_cmnd:
2427         zfcp_unit_put(unit);
2428         zfcp_fsf_req_free(req);
2429         scsi_cmnd->host_scribble = NULL;
2430 out:
2431         spin_unlock(&adapter->req_q_lock);
2432         return retval;
2433 }
2434
2435 /**
2436  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2437  * @adapter: pointer to struct zfcp-adapter
2438  * @unit: pointer to struct zfcp_unit
2439  * @tm_flags: unsigned byte for task management flags
2440  * @req_flags: int request flags
2441  * Returns: on success pointer to struct fsf_req, NULL otherwise
2442  */
2443 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_adapter *adapter,
2444                                            struct zfcp_unit *unit,
2445                                            u8 tm_flags, int req_flags)
2446 {
2447         struct qdio_buffer_element *sbale;
2448         struct zfcp_fsf_req *req = NULL;
2449         struct fcp_cmnd_iu *fcp_cmnd_iu;
2450
2451         if (unlikely(!(atomic_read(&unit->status) &
2452                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2453                 return NULL;
2454
2455         spin_lock(&adapter->req_q_lock);
2456         if (!zfcp_fsf_sbal_available(adapter))
2457                 goto out;
2458         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2459                                   adapter->pool.fsf_req_scsi);
2460         if (IS_ERR(req)) {
2461                 req = NULL;
2462                 goto out;
2463         }
2464
2465         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2466         req->data = unit;
2467         req->handler = zfcp_fsf_send_fcp_command_handler;
2468         req->qtcb->header.lun_handle = unit->handle;
2469         req->qtcb->header.port_handle = unit->port->handle;
2470         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2471         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2472         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2473                                                 sizeof(u32);
2474
2475         sbale = zfcp_qdio_sbale_req(req);
2476         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2477         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2478
2479         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2480         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2481         fcp_cmnd_iu->task_management_flags = tm_flags;
2482
2483         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2484         if (!zfcp_fsf_req_send(req))
2485                 goto out;
2486
2487         zfcp_fsf_req_free(req);
2488         req = NULL;
2489 out:
2490         spin_unlock(&adapter->req_q_lock);
2491         return req;
2492 }
2493
2494 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2495 {
2496         if (req->qtcb->header.fsf_status != FSF_GOOD)
2497                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2498 }
2499
2500 /**
2501  * zfcp_fsf_control_file - control file upload/download
2502  * @adapter: pointer to struct zfcp_adapter
2503  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2504  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2505  */
2506 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2507                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2508 {
2509         struct qdio_buffer_element *sbale;
2510         struct zfcp_fsf_req *req = NULL;
2511         struct fsf_qtcb_bottom_support *bottom;
2512         int direction, retval = -EIO, bytes;
2513
2514         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2515                 return ERR_PTR(-EOPNOTSUPP);
2516
2517         switch (fsf_cfdc->command) {
2518         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2519                 direction = SBAL_FLAGS0_TYPE_WRITE;
2520                 break;
2521         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2522                 direction = SBAL_FLAGS0_TYPE_READ;
2523                 break;
2524         default:
2525                 return ERR_PTR(-EINVAL);
2526         }
2527
2528         spin_lock_bh(&adapter->req_q_lock);
2529         if (zfcp_fsf_req_sbal_get(adapter))
2530                 goto out;
2531
2532         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2533         if (IS_ERR(req)) {
2534                 retval = -EPERM;
2535                 goto out;
2536         }
2537
2538         req->handler = zfcp_fsf_control_file_handler;
2539
2540         sbale = zfcp_qdio_sbale_req(req);
2541         sbale[0].flags |= direction;
2542
2543         bottom = &req->qtcb->bottom.support;
2544         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2545         bottom->option = fsf_cfdc->option;
2546
2547         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2548                                         FSF_MAX_SBALS_PER_REQ);
2549         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2550                 retval = -ENOMEM;
2551                 zfcp_fsf_req_free(req);
2552                 goto out;
2553         }
2554
2555         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2556         retval = zfcp_fsf_req_send(req);
2557 out:
2558         spin_unlock_bh(&adapter->req_q_lock);
2559
2560         if (!retval) {
2561                 wait_event(req->completion_wq,
2562                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2563                 return req;
2564         }
2565         return ERR_PTR(retval);
2566 }