git.oblomov.eu Git - 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
 802         return 0;
 803 }
 804
 805 /**
 806  * zfcp_fsf_status_read - send status read request
 807  * @adapter: pointer to struct zfcp_adapter
 808  * @req_flags: request flags
 809  * Returns: 0 on success, ERROR otherwise
 810  */
 811 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 812 {
 813         struct zfcp_fsf_req *req;
 814         struct fsf_status_read_buffer *sr_buf;
 815         struct qdio_buffer_element *sbale;
 816         int retval = -EIO;
 817
 818         spin_lock_bh(&adapter->req_q_lock);
 819         if (zfcp_fsf_req_sbal_get(adapter))
 820                 goto out;
 821
 822         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 823                                   ZFCP_REQ_NO_QTCB,
 824                                   adapter->pool.fsf_req_status_read);
 825         if (IS_ERR(req)) {
 826                 retval = PTR_ERR(req);
 827                 goto out;
 828         }
 829
 830         sbale = zfcp_qdio_sbale_req(req);
 831         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 832         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 833         req->sbale_curr = 2;
 834
 835         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 836         if (!sr_buf) {
 837                 retval = -ENOMEM;
 838                 goto failed_buf;
 839         }
 840         memset(sr_buf, 0, sizeof(*sr_buf));
 841         req->data = sr_buf;
 842         sbale = zfcp_qdio_sbale_curr(req);
 843         sbale->addr = (void *) sr_buf;
 844         sbale->length = sizeof(*sr_buf);
 845
 846         retval = zfcp_fsf_req_send(req);
 847         if (retval)
 848                 goto failed_req_send;
 849
 850         goto out;
 851
 852 failed_req_send:
 853         mempool_free(sr_buf, adapter->pool.data_status_read);
 854 failed_buf:
 855         zfcp_fsf_req_free(req);
 856         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 857 out:
 858         spin_unlock_bh(&adapter->req_q_lock);
 859         return retval;
 860 }
 861
 862 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 863 {
 864         struct zfcp_unit *unit = req->data;
 865         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 866
 867         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 868                 return;
 869
 870         switch (req->qtcb->header.fsf_status) {
 871         case FSF_PORT_HANDLE_NOT_VALID:
 872                 if (fsq->word[0] == fsq->word[1]) {
 873                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
 874                                                 req);
 875                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 876                 }
 877                 break;
 878         case FSF_LUN_HANDLE_NOT_VALID:
 879                 if (fsq->word[0] == fsq->word[1]) {
 880                         zfcp_erp_port_reopen(unit->port, 0, 105, req);
 881                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 882                 }
 883                 break;
 884         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 885                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 886                 break;
 887         case FSF_PORT_BOXED:
 888                 zfcp_erp_port_boxed(unit->port, 47, req);
 889                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 890                                ZFCP_STATUS_FSFREQ_RETRY;
 891                 break;
 892         case FSF_LUN_BOXED:
 893                 zfcp_erp_unit_boxed(unit, 48, req);
 894                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 895                                ZFCP_STATUS_FSFREQ_RETRY;
 896                 break;
 897         case FSF_ADAPTER_STATUS_AVAILABLE:
 898                 switch (fsq->word[0]) {
 899                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 900                         zfcp_test_link(unit->port);
 901                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 902                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 903                         break;
 904                 }
 905                 break;
 906         case FSF_GOOD:
 907                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 908                 break;
 909         }
 910 }
 911
 912 /**
 913  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 914  * @old_req_id: unsigned long
 915  * @adapter: pointer to struct zfcp_adapter
 916  * @unit: pointer to struct zfcp_unit
 917  * @req_flags: integer specifying the request flags
 918  * Returns: pointer to struct zfcp_fsf_req
 919  *
 920  * FIXME(design): should be watched by a timeout !!!
 921  */
 922
 923 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 924                                                 struct zfcp_adapter *adapter,
 925                                                 struct zfcp_unit *unit,
 926                                                 int req_flags)
 927 {
 928         struct qdio_buffer_element *sbale;
 929         struct zfcp_fsf_req *req = NULL;
 930
 931         spin_lock(&adapter->req_q_lock);
 932         if (!zfcp_fsf_sbal_available(adapter))
 933                 goto out;
 934         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 935                                   req_flags, adapter->pool.fsf_req_abort);
 936         if (IS_ERR(req)) {
 937                 req = NULL;
 938                 goto out;
 939         }
 940
 941         if (unlikely(!(atomic_read(&unit->status) &
 942                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 943                 goto out_error_free;
 944
 945         sbale = zfcp_qdio_sbale_req(req);
 946         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 947         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 948
 949         req->data = unit;
 950         req->handler = zfcp_fsf_abort_fcp_command_handler;
 951         req->qtcb->header.lun_handle = unit->handle;
 952         req->qtcb->header.port_handle = unit->port->handle;
 953         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 954
 955         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 956         if (!zfcp_fsf_req_send(req))
 957                 goto out;
 958
 959 out_error_free:
 960         zfcp_fsf_req_free(req);
 961         req = NULL;
 962 out:
 963         spin_unlock(&adapter->req_q_lock);
 964         return req;
 965 }
 966
 967 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 968 {
 969         struct zfcp_adapter *adapter = req->adapter;
 970         struct zfcp_send_ct *send_ct = req->data;
 971         struct fsf_qtcb_header *header = &req->qtcb->header;
 972
 973         send_ct->status = -EINVAL;
 974
 975         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 976                 goto skip_fsfstatus;
 977
 978         switch (header->fsf_status) {
 979         case FSF_GOOD:
 980                 zfcp_san_dbf_event_ct_response(req);
 981                 send_ct->status = 0;
 982                 break;
 983         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 984                 zfcp_fsf_class_not_supp(req);
 985                 break;
 986         case FSF_ADAPTER_STATUS_AVAILABLE:
 987                 switch (header->fsf_status_qual.word[0]){
 988                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 989                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 990                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 991                         break;
 992                 }
 993                 break;
 994         case FSF_ACCESS_DENIED:
 995                 break;
 996         case FSF_PORT_BOXED:
 997                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 998                                ZFCP_STATUS_FSFREQ_RETRY;
 999                 break;
1000         case FSF_PORT_HANDLE_NOT_VALID:
1001                 zfcp_erp_adapter_reopen(adapter, 0, 106, req);
1002         case FSF_GENERIC_COMMAND_REJECTED:
1003         case FSF_PAYLOAD_SIZE_MISMATCH:
1004         case FSF_REQUEST_SIZE_TOO_LARGE:
1005         case FSF_RESPONSE_SIZE_TOO_LARGE:
1006         case FSF_SBAL_MISMATCH:
1007                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1008                 break;
1009         }
1010
1011 skip_fsfstatus:
1012         if (send_ct->handler)
1013                 send_ct->handler(send_ct->handler_data);
1014 }
1015
1016 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1017                                        struct scatterlist *sg_req,
1018                                        struct scatterlist *sg_resp,
1019                                        int max_sbals)
1020 {
1021         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(req);
1022         u32 feat = req->adapter->adapter_features;
1023         int bytes;
1024
1025         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1026                 if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
1027                     !sg_is_last(sg_req) || !sg_is_last(sg_resp))
1028                         return -EOPNOTSUPP;
1029
1030                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1031                 sbale[2].addr   = sg_virt(sg_req);
1032                 sbale[2].length = sg_req->length;
1033                 sbale[3].addr   = sg_virt(sg_resp);
1034                 sbale[3].length = sg_resp->length;
1035                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1036                 return 0;
1037         }
1038
1039         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1040                                         sg_req, max_sbals);
1041         if (bytes <= 0)
1042                 return -ENOMEM;
1043         req->qtcb->bottom.support.req_buf_length = bytes;
1044         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1045
1046         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1047                                         sg_resp, max_sbals);
1048         if (bytes <= 0)
1049                 return -ENOMEM;
1050         req->qtcb->bottom.support.resp_buf_length = bytes;
1051
1052         return 0;
1053 }
1054
1055 /**
1056  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1057  * @ct: pointer to struct zfcp_send_ct with data for request
1058  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1059  * @erp_action: if non-null the Generic Service request sent within ERP
1060  */
1061 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1062                      struct zfcp_erp_action *erp_action)
1063 {
1064         struct zfcp_wka_port *wka_port = ct->wka_port;
1065         struct zfcp_adapter *adapter = wka_port->adapter;
1066         struct zfcp_fsf_req *req;
1067         int ret = -EIO;
1068
1069         spin_lock_bh(&adapter->req_q_lock);
1070         if (zfcp_fsf_req_sbal_get(adapter))
1071                 goto out;
1072
1073         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1074                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1075         if (IS_ERR(req)) {
1076                 ret = PTR_ERR(req);
1077                 goto out;
1078         }
1079
1080         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1081                                           FSF_MAX_SBALS_PER_REQ);
1082         if (ret)
1083                 goto failed_send;
1084
1085         req->handler = zfcp_fsf_send_ct_handler;
1086         req->qtcb->header.port_handle = wka_port->handle;
1087         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1088         req->qtcb->bottom.support.timeout = ct->timeout;
1089         req->data = ct;
1090
1091         zfcp_san_dbf_event_ct_request(req);
1092
1093         if (erp_action) {
1094                 erp_action->fsf_req = req;
1095                 req->erp_action = erp_action;
1096                 zfcp_fsf_start_erp_timer(req);
1097         } else
1098                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1099
1100         ret = zfcp_fsf_req_send(req);
1101         if (ret)
1102                 goto failed_send;
1103
1104         goto out;
1105
1106 failed_send:
1107         zfcp_fsf_req_free(req);
1108         if (erp_action)
1109                 erp_action->fsf_req = NULL;
1110 out:
1111         spin_unlock_bh(&adapter->req_q_lock);
1112         return ret;
1113 }
1114
1115 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1116 {
1117         struct zfcp_send_els *send_els = req->data;
1118         struct zfcp_port *port = send_els->port;
1119         struct fsf_qtcb_header *header = &req->qtcb->header;
1120
1121         send_els->status = -EINVAL;
1122
1123         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1124                 goto skip_fsfstatus;
1125
1126         switch (header->fsf_status) {
1127         case FSF_GOOD:
1128                 zfcp_san_dbf_event_els_response(req);
1129                 send_els->status = 0;
1130                 break;
1131         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1132                 zfcp_fsf_class_not_supp(req);
1133                 break;
1134         case FSF_ADAPTER_STATUS_AVAILABLE:
1135                 switch (header->fsf_status_qual.word[0]){
1136                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1137                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1138                                 zfcp_test_link(port);
1139                         /*fall through */
1140                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1141                 case FSF_SQ_RETRY_IF_POSSIBLE:
1142                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1143                         break;
1144                 }
1145                 break;
1146         case FSF_ELS_COMMAND_REJECTED:
1147         case FSF_PAYLOAD_SIZE_MISMATCH:
1148         case FSF_REQUEST_SIZE_TOO_LARGE:
1149         case FSF_RESPONSE_SIZE_TOO_LARGE:
1150                 break;
1151         case FSF_ACCESS_DENIED:
1152                 zfcp_fsf_access_denied_port(req, port);
1153                 break;
1154         case FSF_SBAL_MISMATCH:
1155                 /* should never occure, avoided in zfcp_fsf_send_els */
1156                 /* fall through */
1157         default:
1158                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1159                 break;
1160         }
1161 skip_fsfstatus:
1162         if (send_els->handler)
1163                 send_els->handler(send_els->handler_data);
1164 }
1165
1166 /**
1167  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1168  * @els: pointer to struct zfcp_send_els with data for the command
1169  */
1170 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1171 {
1172         struct zfcp_fsf_req *req;
1173         struct zfcp_adapter *adapter = els->adapter;
1174         struct fsf_qtcb_bottom_support *bottom;
1175         int ret = -EIO;
1176
1177         if (unlikely(!(atomic_read(&els->port->status) &
1178                        ZFCP_STATUS_COMMON_UNBLOCKED)))
1179                 return -EBUSY;
1180
1181         spin_lock(&adapter->req_q_lock);
1182         if (!zfcp_fsf_sbal_available(adapter))
1183                 goto out;
1184         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1185                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1186         if (IS_ERR(req)) {
1187                 ret = PTR_ERR(req);
1188                 goto out;
1189         }
1190
1191         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1192
1193         if (ret)
1194                 goto failed_send;
1195
1196         bottom = &req->qtcb->bottom.support;
1197         req->handler = zfcp_fsf_send_els_handler;
1198         bottom->d_id = els->d_id;
1199         bottom->service_class = FSF_CLASS_3;
1200         bottom->timeout = 2 * R_A_TOV;
1201         req->data = els;
1202
1203         zfcp_san_dbf_event_els_request(req);
1204
1205         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1206         ret = zfcp_fsf_req_send(req);
1207         if (ret)
1208                 goto failed_send;
1209
1210         goto out;
1211
1212 failed_send:
1213         zfcp_fsf_req_free(req);
1214 out:
1215         spin_unlock(&adapter->req_q_lock);
1216         return ret;
1217 }
1218
1219 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1220 {
1221         struct qdio_buffer_element *sbale;
1222         struct zfcp_fsf_req *req;
1223         struct zfcp_adapter *adapter = erp_action->adapter;
1224         int retval = -EIO;
1225
1226         spin_lock_bh(&adapter->req_q_lock);
1227         if (!zfcp_fsf_sbal_available(adapter))
1228                 goto out;
1229         req = zfcp_fsf_req_create(adapter,
1230                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1231                                   ZFCP_REQ_AUTO_CLEANUP,
1232                                   adapter->pool.fsf_req_erp);
1233         if (IS_ERR(req)) {
1234                 retval = PTR_ERR(req);
1235                 goto out;
1236         }
1237
1238         sbale = zfcp_qdio_sbale_req(req);
1239         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1240         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1241
1242         req->qtcb->bottom.config.feature_selection =
1243                         FSF_FEATURE_CFDC |
1244                         FSF_FEATURE_LUN_SHARING |
1245                         FSF_FEATURE_NOTIFICATION_LOST |
1246                         FSF_FEATURE_UPDATE_ALERT;
1247         req->erp_action = erp_action;
1248         req->handler = zfcp_fsf_exchange_config_data_handler;
1249         erp_action->fsf_req = req;
1250
1251         zfcp_fsf_start_erp_timer(req);
1252         retval = zfcp_fsf_req_send(req);
1253         if (retval) {
1254                 zfcp_fsf_req_free(req);
1255                 erp_action->fsf_req = NULL;
1256         }
1257 out:
1258         spin_unlock_bh(&adapter->req_q_lock);
1259         return retval;
1260 }
1261
1262 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1263                                        struct fsf_qtcb_bottom_config *data)
1264 {
1265         struct qdio_buffer_element *sbale;
1266         struct zfcp_fsf_req *req = NULL;
1267         int retval = -EIO;
1268
1269         spin_lock_bh(&adapter->req_q_lock);
1270         if (zfcp_fsf_req_sbal_get(adapter))
1271                 goto out;
1272
1273         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1274                                   0, NULL);
1275         if (IS_ERR(req)) {
1276                 retval = PTR_ERR(req);
1277                 goto out;
1278         }
1279
1280         sbale = zfcp_qdio_sbale_req(req);
1281         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1282         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1283         req->handler = zfcp_fsf_exchange_config_data_handler;
1284
1285         req->qtcb->bottom.config.feature_selection =
1286                         FSF_FEATURE_CFDC |
1287                         FSF_FEATURE_LUN_SHARING |
1288                         FSF_FEATURE_NOTIFICATION_LOST |
1289                         FSF_FEATURE_UPDATE_ALERT;
1290
1291         if (data)
1292                 req->data = data;
1293
1294         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1295         retval = zfcp_fsf_req_send(req);
1296 out:
1297         spin_unlock_bh(&adapter->req_q_lock);
1298         if (!retval)
1299                 wait_event(req->completion_wq,
1300                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1301
1302         zfcp_fsf_req_free(req);
1303
1304         return retval;
1305 }
1306
1307 /**
1308  * zfcp_fsf_exchange_port_data - request information about local port
1309  * @erp_action: ERP action for the adapter for which port data is requested
1310  * Returns: 0 on success, error otherwise
1311  */
1312 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1313 {
1314         struct qdio_buffer_element *sbale;
1315         struct zfcp_fsf_req *req;
1316         struct zfcp_adapter *adapter = erp_action->adapter;
1317         int retval = -EIO;
1318
1319         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1320                 return -EOPNOTSUPP;
1321
1322         spin_lock_bh(&adapter->req_q_lock);
1323         if (!zfcp_fsf_sbal_available(adapter))
1324                 goto out;
1325         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1326                                   ZFCP_REQ_AUTO_CLEANUP,
1327                                   adapter->pool.fsf_req_erp);
1328         if (IS_ERR(req)) {
1329                 retval = PTR_ERR(req);
1330                 goto out;
1331         }
1332
1333         sbale = zfcp_qdio_sbale_req(req);
1334         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1335         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1336
1337         req->handler = zfcp_fsf_exchange_port_data_handler;
1338         req->erp_action = erp_action;
1339         erp_action->fsf_req = req;
1340
1341         zfcp_fsf_start_erp_timer(req);
1342         retval = zfcp_fsf_req_send(req);
1343         if (retval) {
1344                 zfcp_fsf_req_free(req);
1345                 erp_action->fsf_req = NULL;
1346         }
1347 out:
1348         spin_unlock_bh(&adapter->req_q_lock);
1349         return retval;
1350 }
1351
1352 /**
1353  * zfcp_fsf_exchange_port_data_sync - request information about local port
1354  * @adapter: pointer to struct zfcp_adapter
1355  * @data: pointer to struct fsf_qtcb_bottom_port
1356  * Returns: 0 on success, error otherwise
1357  */
1358 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1359                                      struct fsf_qtcb_bottom_port *data)
1360 {
1361         struct qdio_buffer_element *sbale;
1362         struct zfcp_fsf_req *req = NULL;
1363         int retval = -EIO;
1364
1365         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1366                 return -EOPNOTSUPP;
1367
1368         spin_lock_bh(&adapter->req_q_lock);
1369         if (!zfcp_fsf_sbal_available(adapter))
1370                 goto out;
1371
1372         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1373                                   NULL);
1374         if (IS_ERR(req)) {
1375                 retval = PTR_ERR(req);
1376                 goto out;
1377         }
1378
1379         if (data)
1380                 req->data = data;
1381
1382         sbale = zfcp_qdio_sbale_req(req);
1383         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1384         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1385
1386         req->handler = zfcp_fsf_exchange_port_data_handler;
1387         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1388         retval = zfcp_fsf_req_send(req);
1389 out:
1390         spin_unlock_bh(&adapter->req_q_lock);
1391         if (!retval)
1392                 wait_event(req->completion_wq,
1393                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1394         zfcp_fsf_req_free(req);
1395
1396         return retval;
1397 }
1398
1399 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1400 {
1401         struct zfcp_port *port = req->data;
1402         struct fsf_qtcb_header *header = &req->qtcb->header;
1403         struct fsf_plogi *plogi;
1404
1405         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1406                 return;
1407
1408         switch (header->fsf_status) {
1409         case FSF_PORT_ALREADY_OPEN:
1410                 break;
1411         case FSF_ACCESS_DENIED:
1412                 zfcp_fsf_access_denied_port(req, port);
1413                 break;
1414         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1415                 dev_warn(&req->adapter->ccw_device->dev,
1416                          "Not enough FCP adapter resources to open "
1417                          "remote port 0x%016Lx\n",
1418                          (unsigned long long)port->wwpn);
1419                 zfcp_erp_port_failed(port, 31, req);
1420                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1421                 break;
1422         case FSF_ADAPTER_STATUS_AVAILABLE:
1423                 switch (header->fsf_status_qual.word[0]) {
1424                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1425                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1426                 case FSF_SQ_NO_RETRY_POSSIBLE:
1427                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1428                         break;
1429                 }
1430                 break;
1431         case FSF_GOOD:
1432                 port->handle = header->port_handle;
1433                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1434                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1435                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1436                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1437                                   &port->status);
1438                 /* check whether D_ID has changed during open */
1439                 /*
1440                  * FIXME: This check is not airtight, as the FCP channel does
1441                  * not monitor closures of target port connections caused on
1442                  * the remote side. Thus, they might miss out on invalidating
1443                  * locally cached WWPNs (and other N_Port parameters) of gone
1444                  * target ports. So, our heroic attempt to make things safe
1445                  * could be undermined by 'open port' response data tagged with
1446                  * obsolete WWPNs. Another reason to monitor potential
1447                  * connection closures ourself at least (by interpreting
1448                  * incoming ELS' and unsolicited status). It just crosses my
1449                  * mind that one should be able to cross-check by means of
1450                  * another GID_PN straight after a port has been opened.
1451                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1452                  */
1453                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1454                 if (req->qtcb->bottom.support.els1_length >=
1455                     FSF_PLOGI_MIN_LEN) {
1456                         if (plogi->serv_param.wwpn != port->wwpn)
1457                                 port->d_id = 0;
1458                         else {
1459                                 port->wwnn = plogi->serv_param.wwnn;
1460                                 zfcp_fc_plogi_evaluate(port, plogi);
1461                         }
1462                 }
1463                 break;
1464         case FSF_UNKNOWN_OP_SUBTYPE:
1465                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1466                 break;
1467         }
1468 }
1469
1470 /**
1471  * zfcp_fsf_open_port - create and send open port request
1472  * @erp_action: pointer to struct zfcp_erp_action
1473  * Returns: 0 on success, error otherwise
1474  */
1475 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1476 {
1477         struct qdio_buffer_element *sbale;
1478         struct zfcp_adapter *adapter = erp_action->adapter;
1479         struct zfcp_fsf_req *req;
1480         int retval = -EIO;
1481
1482         spin_lock_bh(&adapter->req_q_lock);
1483         if (zfcp_fsf_req_sbal_get(adapter))
1484                 goto out;
1485
1486         req = zfcp_fsf_req_create(adapter,
1487                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1488                                   ZFCP_REQ_AUTO_CLEANUP,
1489                                   adapter->pool.fsf_req_erp);
1490         if (IS_ERR(req)) {
1491                 retval = PTR_ERR(req);
1492                 goto out;
1493         }
1494
1495         sbale = zfcp_qdio_sbale_req(req);
1496         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1497         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1498
1499         req->handler = zfcp_fsf_open_port_handler;
1500         req->qtcb->bottom.support.d_id = erp_action->port->d_id;
1501         req->data = erp_action->port;
1502         req->erp_action = erp_action;
1503         erp_action->fsf_req = req;
1504
1505         zfcp_fsf_start_erp_timer(req);
1506         retval = zfcp_fsf_req_send(req);
1507         if (retval) {
1508                 zfcp_fsf_req_free(req);
1509                 erp_action->fsf_req = NULL;
1510         }
1511 out:
1512         spin_unlock_bh(&adapter->req_q_lock);
1513         return retval;
1514 }
1515
1516 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1517 {
1518         struct zfcp_port *port = req->data;
1519
1520         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1521                 return;
1522
1523         switch (req->qtcb->header.fsf_status) {
1524         case FSF_PORT_HANDLE_NOT_VALID:
1525                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, req);
1526                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1527                 break;
1528         case FSF_ADAPTER_STATUS_AVAILABLE:
1529                 break;
1530         case FSF_GOOD:
1531                 zfcp_erp_modify_port_status(port, 33, req,
1532                                             ZFCP_STATUS_COMMON_OPEN,
1533                                             ZFCP_CLEAR);
1534                 break;
1535         }
1536 }
1537
1538 /**
1539  * zfcp_fsf_close_port - create and send close port request
1540  * @erp_action: pointer to struct zfcp_erp_action
1541  * Returns: 0 on success, error otherwise
1542  */
1543 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1544 {
1545         struct qdio_buffer_element *sbale;
1546         struct zfcp_adapter *adapter = erp_action->adapter;
1547         struct zfcp_fsf_req *req;
1548         int retval = -EIO;
1549
1550         spin_lock_bh(&adapter->req_q_lock);
1551         if (zfcp_fsf_req_sbal_get(adapter))
1552                 goto out;
1553
1554         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1555                                   ZFCP_REQ_AUTO_CLEANUP,
1556                                   adapter->pool.fsf_req_erp);
1557         if (IS_ERR(req)) {
1558                 retval = PTR_ERR(req);
1559                 goto out;
1560         }
1561
1562         sbale = zfcp_qdio_sbale_req(req);
1563         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1564         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1565
1566         req->handler = zfcp_fsf_close_port_handler;
1567         req->data = erp_action->port;
1568         req->erp_action = erp_action;
1569         req->qtcb->header.port_handle = erp_action->port->handle;
1570         erp_action->fsf_req = req;
1571
1572         zfcp_fsf_start_erp_timer(req);
1573         retval = zfcp_fsf_req_send(req);
1574         if (retval) {
1575                 zfcp_fsf_req_free(req);
1576                 erp_action->fsf_req = NULL;
1577         }
1578 out:
1579         spin_unlock_bh(&adapter->req_q_lock);
1580         return retval;
1581 }
1582
1583 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1584 {
1585         struct zfcp_wka_port *wka_port = req->data;
1586         struct fsf_qtcb_header *header = &req->qtcb->header;
1587
1588         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1589                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1590                 goto out;
1591         }
1592
1593         switch (header->fsf_status) {
1594         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1595                 dev_warn(&req->adapter->ccw_device->dev,
1596                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1597         case FSF_ADAPTER_STATUS_AVAILABLE:
1598                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1599         case FSF_ACCESS_DENIED:
1600                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1601                 break;
1602         case FSF_PORT_ALREADY_OPEN:
1603                 break;
1604         case FSF_GOOD:
1605                 wka_port->handle = header->port_handle;
1606                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1607         }
1608 out:
1609         wake_up(&wka_port->completion_wq);
1610 }
1611
1612 /**
1613  * zfcp_fsf_open_wka_port - create and send open wka-port request
1614  * @wka_port: pointer to struct zfcp_wka_port
1615  * Returns: 0 on success, error otherwise
1616  */
1617 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1618 {
1619         struct qdio_buffer_element *sbale;
1620         struct zfcp_adapter *adapter = wka_port->adapter;
1621         struct zfcp_fsf_req *req;
1622         int retval = -EIO;
1623
1624         spin_lock_bh(&adapter->req_q_lock);
1625         if (zfcp_fsf_req_sbal_get(adapter))
1626                 goto out;
1627
1628         req = zfcp_fsf_req_create(adapter,
1629                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1630                                   ZFCP_REQ_AUTO_CLEANUP,
1631                                   adapter->pool.fsf_req_erp);
1632         if (unlikely(IS_ERR(req))) {
1633                 retval = PTR_ERR(req);
1634                 goto out;
1635         }
1636
1637         sbale = zfcp_qdio_sbale_req(req);
1638         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1639         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1640
1641         req->handler = zfcp_fsf_open_wka_port_handler;
1642         req->qtcb->bottom.support.d_id = wka_port->d_id;
1643         req->data = wka_port;
1644
1645         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1646         retval = zfcp_fsf_req_send(req);
1647         if (retval)
1648                 zfcp_fsf_req_free(req);
1649 out:
1650         spin_unlock_bh(&adapter->req_q_lock);
1651         return retval;
1652 }
1653
1654 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1655 {
1656         struct zfcp_wka_port *wka_port = req->data;
1657
1658         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1659                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1660                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, 84, req);
1661         }
1662
1663         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1664         wake_up(&wka_port->completion_wq);
1665 }
1666
1667 /**
1668  * zfcp_fsf_close_wka_port - create and send close wka port request
1669  * @erp_action: pointer to struct zfcp_erp_action
1670  * Returns: 0 on success, error otherwise
1671  */
1672 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1673 {
1674         struct qdio_buffer_element *sbale;
1675         struct zfcp_adapter *adapter = wka_port->adapter;
1676         struct zfcp_fsf_req *req;
1677         int retval = -EIO;
1678
1679         spin_lock_bh(&adapter->req_q_lock);
1680         if (zfcp_fsf_req_sbal_get(adapter))
1681                 goto out;
1682
1683         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1684                                   ZFCP_REQ_AUTO_CLEANUP,
1685                                   adapter->pool.fsf_req_erp);
1686         if (unlikely(IS_ERR(req))) {
1687                 retval = PTR_ERR(req);
1688                 goto out;
1689         }
1690
1691         sbale = zfcp_qdio_sbale_req(req);
1692         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1693         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1694
1695         req->handler = zfcp_fsf_close_wka_port_handler;
1696         req->data = wka_port;
1697         req->qtcb->header.port_handle = wka_port->handle;
1698
1699         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1700         retval = zfcp_fsf_req_send(req);
1701         if (retval)
1702                 zfcp_fsf_req_free(req);
1703 out:
1704         spin_unlock_bh(&adapter->req_q_lock);
1705         return retval;
1706 }
1707
1708 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1709 {
1710         struct zfcp_port *port = req->data;
1711         struct fsf_qtcb_header *header = &req->qtcb->header;
1712         struct zfcp_unit *unit;
1713
1714         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1715                 goto skip_fsfstatus;
1716
1717         switch (header->fsf_status) {
1718         case FSF_PORT_HANDLE_NOT_VALID:
1719                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, req);
1720                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1721                 break;
1722         case FSF_ACCESS_DENIED:
1723                 zfcp_fsf_access_denied_port(req, port);
1724                 break;
1725         case FSF_PORT_BOXED:
1726                 zfcp_erp_port_boxed(port, 50, req);
1727                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1728                                ZFCP_STATUS_FSFREQ_RETRY;
1729                 /* can't use generic zfcp_erp_modify_port_status because
1730                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1731                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1732                 list_for_each_entry(unit, &port->unit_list_head, list)
1733                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1734                                           &unit->status);
1735                 break;
1736         case FSF_ADAPTER_STATUS_AVAILABLE:
1737                 switch (header->fsf_status_qual.word[0]) {
1738                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1739                         /* fall through */
1740                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1741                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1742                         break;
1743                 }
1744                 break;
1745         case FSF_GOOD:
1746                 /* can't use generic zfcp_erp_modify_port_status because
1747                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1748                  */
1749                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1750                 list_for_each_entry(unit, &port->unit_list_head, list)
1751                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1752                                           &unit->status);
1753                 break;
1754         }
1755 skip_fsfstatus:
1756         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
1757 }
1758
1759 /**
1760  * zfcp_fsf_close_physical_port - close physical port
1761  * @erp_action: pointer to struct zfcp_erp_action
1762  * Returns: 0 on success
1763  */
1764 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1765 {
1766         struct qdio_buffer_element *sbale;
1767         struct zfcp_adapter *adapter = erp_action->adapter;
1768         struct zfcp_fsf_req *req;
1769         int retval = -EIO;
1770
1771         spin_lock_bh(&adapter->req_q_lock);
1772         if (zfcp_fsf_req_sbal_get(adapter))
1773                 goto out;
1774
1775         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1776                                   ZFCP_REQ_AUTO_CLEANUP,
1777                                   adapter->pool.fsf_req_erp);
1778         if (IS_ERR(req)) {
1779                 retval = PTR_ERR(req);
1780                 goto out;
1781         }
1782
1783         sbale = zfcp_qdio_sbale_req(req);
1784         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1785         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1786
1787         req->data = erp_action->port;
1788         req->qtcb->header.port_handle = erp_action->port->handle;
1789         req->erp_action = erp_action;
1790         req->handler = zfcp_fsf_close_physical_port_handler;
1791         erp_action->fsf_req = req;
1792         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
1793                         &erp_action->port->status);
1794
1795         zfcp_fsf_start_erp_timer(req);
1796         retval = zfcp_fsf_req_send(req);
1797         if (retval) {
1798                 zfcp_fsf_req_free(req);
1799                 erp_action->fsf_req = NULL;
1800         }
1801 out:
1802         spin_unlock_bh(&adapter->req_q_lock);
1803         return retval;
1804 }
1805
1806 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1807 {
1808         struct zfcp_adapter *adapter = req->adapter;
1809         struct zfcp_unit *unit = req->data;
1810         struct fsf_qtcb_header *header = &req->qtcb->header;
1811         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1812         struct fsf_queue_designator *queue_designator =
1813                                 &header->fsf_status_qual.fsf_queue_designator;
1814         int exclusive, readwrite;
1815
1816         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1817                 return;
1818
1819         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1820                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1821                           ZFCP_STATUS_UNIT_SHARED |
1822                           ZFCP_STATUS_UNIT_READONLY,
1823                           &unit->status);
1824
1825         switch (header->fsf_status) {
1826
1827         case FSF_PORT_HANDLE_NOT_VALID:
1828                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, req);
1829                 /* fall through */
1830         case FSF_LUN_ALREADY_OPEN:
1831                 break;
1832         case FSF_ACCESS_DENIED:
1833                 zfcp_fsf_access_denied_unit(req, unit);
1834                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1835                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1836                 break;
1837         case FSF_PORT_BOXED:
1838                 zfcp_erp_port_boxed(unit->port, 51, req);
1839                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1840                                ZFCP_STATUS_FSFREQ_RETRY;
1841                 break;
1842         case FSF_LUN_SHARING_VIOLATION:
1843                 if (header->fsf_status_qual.word[0])
1844                         dev_warn(&adapter->ccw_device->dev,
1845                                  "LUN 0x%Lx on port 0x%Lx is already in "
1846                                  "use by CSS%d, MIF Image ID %x\n",
1847                                  (unsigned long long)unit->fcp_lun,
1848                                  (unsigned long long)unit->port->wwpn,
1849                                  queue_designator->cssid,
1850                                  queue_designator->hla);
1851                 else
1852                         zfcp_act_eval_err(adapter,
1853                                           header->fsf_status_qual.word[2]);
1854                 zfcp_erp_unit_access_denied(unit, 60, req);
1855                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1856                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1857                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1858                 break;
1859         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1860                 dev_warn(&adapter->ccw_device->dev,
1861                          "No handle is available for LUN "
1862                          "0x%016Lx on port 0x%016Lx\n",
1863                          (unsigned long long)unit->fcp_lun,
1864                          (unsigned long long)unit->port->wwpn);
1865                 zfcp_erp_unit_failed(unit, 34, req);
1866                 /* fall through */
1867         case FSF_INVALID_COMMAND_OPTION:
1868                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1869                 break;
1870         case FSF_ADAPTER_STATUS_AVAILABLE:
1871                 switch (header->fsf_status_qual.word[0]) {
1872                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1873                         zfcp_test_link(unit->port);
1874                         /* fall through */
1875                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1876                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1877                         break;
1878                 }
1879                 break;
1880
1881         case FSF_GOOD:
1882                 unit->handle = header->lun_handle;
1883                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1884
1885                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1886                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1887                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1888                         exclusive = (bottom->lun_access_info &
1889                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1890                         readwrite = (bottom->lun_access_info &
1891                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1892
1893                         if (!exclusive)
1894                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1895                                                 &unit->status);
1896
1897                         if (!readwrite) {
1898                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1899                                                 &unit->status);
1900                                 dev_info(&adapter->ccw_device->dev,
1901                                          "SCSI device at LUN 0x%016Lx on port "
1902                                          "0x%016Lx opened read-only\n",
1903                                          (unsigned long long)unit->fcp_lun,
1904                                          (unsigned long long)unit->port->wwpn);
1905                         }
1906
1907                         if (exclusive && !readwrite) {
1908                                 dev_err(&adapter->ccw_device->dev,
1909                                         "Exclusive read-only access not "
1910                                         "supported (unit 0x%016Lx, "
1911                                         "port 0x%016Lx)\n",
1912                                         (unsigned long long)unit->fcp_lun,
1913                                         (unsigned long long)unit->port->wwpn);
1914                                 zfcp_erp_unit_failed(unit, 35, req);
1915                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1916                                 zfcp_erp_unit_shutdown(unit, 0, 80, req);
1917                         } else if (!exclusive && readwrite) {
1918                                 dev_err(&adapter->ccw_device->dev,
1919                                         "Shared read-write access not "
1920                                         "supported (unit 0x%016Lx, port "
1921                                         "0x%016Lx)\n",
1922                                         (unsigned long long)unit->fcp_lun,
1923                                         (unsigned long long)unit->port->wwpn);
1924                                 zfcp_erp_unit_failed(unit, 36, req);
1925                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1926                                 zfcp_erp_unit_shutdown(unit, 0, 81, req);
1927                         }
1928                 }
1929                 break;
1930         }
1931 }
1932
1933 /**
1934  * zfcp_fsf_open_unit - open unit
1935  * @erp_action: pointer to struct zfcp_erp_action
1936  * Returns: 0 on success, error otherwise
1937  */
1938 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1939 {
1940         struct qdio_buffer_element *sbale;
1941         struct zfcp_adapter *adapter = erp_action->adapter;
1942         struct zfcp_fsf_req *req;
1943         int retval = -EIO;
1944
1945         spin_lock_bh(&adapter->req_q_lock);
1946         if (zfcp_fsf_req_sbal_get(adapter))
1947                 goto out;
1948
1949         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1950                                   ZFCP_REQ_AUTO_CLEANUP,
1951                                   adapter->pool.fsf_req_erp);
1952         if (IS_ERR(req)) {
1953                 retval = PTR_ERR(req);
1954                 goto out;
1955         }
1956
1957         sbale = zfcp_qdio_sbale_req(req);
1958         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1959         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1960
1961         req->qtcb->header.port_handle = erp_action->port->handle;
1962         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1963         req->handler = zfcp_fsf_open_unit_handler;
1964         req->data = erp_action->unit;
1965         req->erp_action = erp_action;
1966         erp_action->fsf_req = req;
1967
1968         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1969                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1970
1971         zfcp_fsf_start_erp_timer(req);
1972         retval = zfcp_fsf_req_send(req);
1973         if (retval) {
1974                 zfcp_fsf_req_free(req);
1975                 erp_action->fsf_req = NULL;
1976         }
1977 out:
1978         spin_unlock_bh(&adapter->req_q_lock);
1979         return retval;
1980 }
1981
1982 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1983 {
1984         struct zfcp_unit *unit = req->data;
1985
1986         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1987                 return;
1988
1989         switch (req->qtcb->header.fsf_status) {
1990         case FSF_PORT_HANDLE_NOT_VALID:
1991                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, req);
1992                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1993                 break;
1994         case FSF_LUN_HANDLE_NOT_VALID:
1995                 zfcp_erp_port_reopen(unit->port, 0, 111, req);
1996                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1997                 break;
1998         case FSF_PORT_BOXED:
1999                 zfcp_erp_port_boxed(unit->port, 52, req);
2000                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2001                                ZFCP_STATUS_FSFREQ_RETRY;
2002                 break;
2003         case FSF_ADAPTER_STATUS_AVAILABLE:
2004                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
2005                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2006                         zfcp_test_link(unit->port);
2007                         /* fall through */
2008                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2009                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2010                         break;
2011                 }
2012                 break;
2013         case FSF_GOOD:
2014                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2015                 break;
2016         }
2017 }
2018
2019 /**
2020  * zfcp_fsf_close_unit - close zfcp unit
2021  * @erp_action: pointer to struct zfcp_unit
2022  * Returns: 0 on success, error otherwise
2023  */
2024 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2025 {
2026         struct qdio_buffer_element *sbale;
2027         struct zfcp_adapter *adapter = erp_action->adapter;
2028         struct zfcp_fsf_req *req;
2029         int retval = -EIO;
2030
2031         spin_lock_bh(&adapter->req_q_lock);
2032         if (zfcp_fsf_req_sbal_get(adapter))
2033                 goto out;
2034         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2035                                   ZFCP_REQ_AUTO_CLEANUP,
2036                                   adapter->pool.fsf_req_erp);
2037         if (IS_ERR(req)) {
2038                 retval = PTR_ERR(req);
2039                 goto out;
2040         }
2041
2042         sbale = zfcp_qdio_sbale_req(req);
2043         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2044         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2045
2046         req->qtcb->header.port_handle = erp_action->port->handle;
2047         req->qtcb->header.lun_handle = erp_action->unit->handle;
2048         req->handler = zfcp_fsf_close_unit_handler;
2049         req->data = erp_action->unit;
2050         req->erp_action = erp_action;
2051         erp_action->fsf_req = req;
2052
2053         zfcp_fsf_start_erp_timer(req);
2054         retval = zfcp_fsf_req_send(req);
2055         if (retval) {
2056                 zfcp_fsf_req_free(req);
2057                 erp_action->fsf_req = NULL;
2058         }
2059 out:
2060         spin_unlock_bh(&adapter->req_q_lock);
2061         return retval;
2062 }
2063
2064 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2065 {
2066         lat_rec->sum += lat;
2067         lat_rec->min = min(lat_rec->min, lat);
2068         lat_rec->max = max(lat_rec->max, lat);
2069 }
2070
2071 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2072 {
2073         struct fsf_qual_latency_info *lat_inf;
2074         struct latency_cont *lat;
2075         struct zfcp_unit *unit = req->unit;
2076         unsigned long flags;
2077
2078         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2079
2080         switch (req->qtcb->bottom.io.data_direction) {
2081         case FSF_DATADIR_READ:
2082                 lat = &unit->latencies.read;
2083                 break;
2084         case FSF_DATADIR_WRITE:
2085                 lat = &unit->latencies.write;
2086                 break;
2087         case FSF_DATADIR_CMND:
2088                 lat = &unit->latencies.cmd;
2089                 break;
2090         default:
2091                 return;
2092         }
2093
2094         spin_lock_irqsave(&unit->latencies.lock, flags);
2095         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2096         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2097         lat->counter++;
2098         spin_unlock_irqrestore(&unit->latencies.lock, flags);
2099 }
2100
2101 #ifdef CONFIG_BLK_DEV_IO_TRACE
2102 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2103 {
2104         struct fsf_qual_latency_info *lat_inf;
2105         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2106         struct request *req = scsi_cmnd->request;
2107         struct zfcp_blk_drv_data trace;
2108         int ticks = fsf_req->adapter->timer_ticks;
2109
2110         trace.flags = 0;
2111         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2112         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2113                 trace.flags |= ZFCP_BLK_LAT_VALID;
2114                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2115                 trace.channel_lat = lat_inf->channel_lat * ticks;
2116                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2117         }
2118         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2119                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2120         trace.inb_usage = fsf_req->qdio_inb_usage;
2121         trace.outb_usage = fsf_req->qdio_outb_usage;
2122
2123         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2124 }
2125 #else
2126 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2127 {
2128 }
2129 #endif
2130
2131 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2132 {
2133         struct scsi_cmnd *scpnt;
2134         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2135             &(req->qtcb->bottom.io.fcp_rsp);
2136         u32 sns_len;
2137         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2138         unsigned long flags;
2139
2140         read_lock_irqsave(&req->adapter->abort_lock, flags);
2141
2142         scpnt = req->data;
2143         if (unlikely(!scpnt)) {
2144                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2145                 return;
2146         }
2147
2148         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2149                 set_host_byte(scpnt, DID_SOFT_ERROR);
2150                 set_driver_byte(scpnt, SUGGEST_RETRY);
2151                 goto skip_fsfstatus;
2152         }
2153
2154         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2155                 set_host_byte(scpnt, DID_ERROR);
2156                 goto skip_fsfstatus;
2157         }
2158
2159         set_msg_byte(scpnt, COMMAND_COMPLETE);
2160
2161         scpnt->result |= fcp_rsp_iu->scsi_status;
2162
2163         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2164                 zfcp_fsf_req_latency(req);
2165
2166         zfcp_fsf_trace_latency(req);
2167
2168         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2169                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2170                         set_host_byte(scpnt, DID_OK);
2171                 else {
2172                         set_host_byte(scpnt, DID_ERROR);
2173                         goto skip_fsfstatus;
2174                 }
2175         }
2176
2177         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2178                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2179                           fcp_rsp_iu->fcp_rsp_len;
2180                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2181                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2182
2183                 memcpy(scpnt->sense_buffer,
2184                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2185         }
2186
2187         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2188                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2189                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2190                     scpnt->underflow)
2191                         set_host_byte(scpnt, DID_ERROR);
2192         }
2193 skip_fsfstatus:
2194         if (scpnt->result != 0)
2195                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2196         else if (scpnt->retries > 0)
2197                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2198         else
2199                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2200
2201         scpnt->host_scribble = NULL;
2202         (scpnt->scsi_done) (scpnt);
2203         /*
2204          * We must hold this lock until scsi_done has been called.
2205          * Otherwise we may call scsi_done after abort regarding this
2206          * command has completed.
2207          * Note: scsi_done must not block!
2208          */
2209         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2210 }
2211
2212 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2213 {
2214         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2215             &(req->qtcb->bottom.io.fcp_rsp);
2216         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2217
2218         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2219              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2220                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2221 }
2222
2223
2224 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2225 {
2226         struct zfcp_unit *unit;
2227         struct fsf_qtcb_header *header = &req->qtcb->header;
2228
2229         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2230                 unit = req->data;
2231         else
2232                 unit = req->unit;
2233
2234         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2235                 goto skip_fsfstatus;
2236
2237         switch (header->fsf_status) {
2238         case FSF_HANDLE_MISMATCH:
2239         case FSF_PORT_HANDLE_NOT_VALID:
2240                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, req);
2241                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2242                 break;
2243         case FSF_FCPLUN_NOT_VALID:
2244         case FSF_LUN_HANDLE_NOT_VALID:
2245                 zfcp_erp_port_reopen(unit->port, 0, 113, req);
2246                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2247                 break;
2248         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2249                 zfcp_fsf_class_not_supp(req);
2250                 break;
2251         case FSF_ACCESS_DENIED:
2252                 zfcp_fsf_access_denied_unit(req, unit);
2253                 break;
2254         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2255                 dev_err(&req->adapter->ccw_device->dev,
2256                         "Incorrect direction %d, unit 0x%016Lx on port "
2257                         "0x%016Lx closed\n",
2258                         req->qtcb->bottom.io.data_direction,
2259                         (unsigned long long)unit->fcp_lun,
2260                         (unsigned long long)unit->port->wwpn);
2261                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, req);
2262                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2263                 break;
2264         case FSF_CMND_LENGTH_NOT_VALID:
2265                 dev_err(&req->adapter->ccw_device->dev,
2266                         "Incorrect CDB length %d, unit 0x%016Lx on "
2267                         "port 0x%016Lx closed\n",
2268                         req->qtcb->bottom.io.fcp_cmnd_length,
2269                         (unsigned long long)unit->fcp_lun,
2270                         (unsigned long long)unit->port->wwpn);
2271                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, req);
2272                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2273                 break;
2274         case FSF_PORT_BOXED:
2275                 zfcp_erp_port_boxed(unit->port, 53, req);
2276                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2277                                ZFCP_STATUS_FSFREQ_RETRY;
2278                 break;
2279         case FSF_LUN_BOXED:
2280                 zfcp_erp_unit_boxed(unit, 54, req);
2281                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2282                                ZFCP_STATUS_FSFREQ_RETRY;
2283                 break;
2284         case FSF_ADAPTER_STATUS_AVAILABLE:
2285                 if (header->fsf_status_qual.word[0] ==
2286                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2287                         zfcp_test_link(unit->port);
2288                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2289                 break;
2290         }
2291 skip_fsfstatus:
2292         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2293                 zfcp_fsf_send_fcp_ctm_handler(req);
2294         else {
2295                 zfcp_fsf_send_fcp_command_task_handler(req);
2296                 req->unit = NULL;
2297                 zfcp_unit_put(unit);
2298         }
2299 }
2300
2301 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2302 {
2303         u32 *fcp_dl_ptr;
2304
2305         /*
2306          * fcp_dl_addr = start address of fcp_cmnd structure +
2307          * size of fixed part + size of dynamically sized add_dcp_cdb field
2308          * SEE FCP-2 documentation
2309          */
2310         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2311                         (fcp_cmd->add_fcp_cdb_length << 2));
2312         *fcp_dl_ptr = fcp_dl;
2313 }
2314
2315 /**
2316  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2317  * @adapter: adapter where scsi command is issued
2318  * @unit: unit where command is sent to
2319  * @scsi_cmnd: scsi command to be sent
2320  * @timer: timer to be started when request is initiated
2321  * @req_flags: flags for fsf_request
2322  */
2323 int zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
2324                                    struct zfcp_unit *unit,
2325                                    struct scsi_cmnd *scsi_cmnd,
2326                                    int use_timer, int req_flags)
2327 {
2328         struct zfcp_fsf_req *req;
2329         struct fcp_cmnd_iu *fcp_cmnd_iu;
2330         unsigned int sbtype;
2331         int real_bytes, retval = -EIO;
2332
2333         if (unlikely(!(atomic_read(&unit->status) &
2334                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2335                 return -EBUSY;
2336
2337         spin_lock(&adapter->req_q_lock);
2338         if (!zfcp_fsf_sbal_available(adapter))
2339                 goto out;
2340         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2341                                   adapter->pool.fsf_req_scsi);
2342         if (IS_ERR(req)) {
2343                 retval = PTR_ERR(req);
2344                 goto out;
2345         }
2346
2347         zfcp_unit_get(unit);
2348         req->unit = unit;
2349         req->data = scsi_cmnd;
2350         req->handler = zfcp_fsf_send_fcp_command_handler;
2351         req->qtcb->header.lun_handle = unit->handle;
2352         req->qtcb->header.port_handle = unit->port->handle;
2353         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2354
2355         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2356
2357         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2358         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2359         /*
2360          * set depending on data direction:
2361          *      data direction bits in SBALE (SB Type)
2362          *      data direction bits in QTCB
2363          *      data direction bits in FCP_CMND IU
2364          */
2365         switch (scsi_cmnd->sc_data_direction) {
2366         case DMA_NONE:
2367                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2368                 sbtype = SBAL_FLAGS0_TYPE_READ;
2369                 break;
2370         case DMA_FROM_DEVICE:
2371                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2372                 sbtype = SBAL_FLAGS0_TYPE_READ;
2373                 fcp_cmnd_iu->rddata = 1;
2374                 break;
2375         case DMA_TO_DEVICE:
2376                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2377                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2378                 fcp_cmnd_iu->wddata = 1;
2379                 break;
2380         case DMA_BIDIRECTIONAL:
2381         default:
2382                 retval = -EIO;
2383                 goto failed_scsi_cmnd;
2384         }
2385
2386         if (likely((scsi_cmnd->device->simple_tags) ||
2387                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2388                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2389                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2390         else
2391                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2392
2393         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2394                 fcp_cmnd_iu->add_fcp_cdb_length =
2395                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2396
2397         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2398
2399         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2400                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2401
2402         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2403                                              scsi_sglist(scsi_cmnd),
2404                                              FSF_MAX_SBALS_PER_REQ);
2405         if (unlikely(real_bytes < 0)) {
2406                 if (req->sbal_number < FSF_MAX_SBALS_PER_REQ)
2407                         retval = -EIO;
2408                 else {
2409                         dev_err(&adapter->ccw_device->dev,
2410                                 "Oversize data package, unit 0x%016Lx "
2411                                 "on port 0x%016Lx closed\n",
2412                                 (unsigned long long)unit->fcp_lun,
2413                                 (unsigned long long)unit->port->wwpn);
2414                         zfcp_erp_unit_shutdown(unit, 0, 131, req);
2415                         retval = -EINVAL;
2416                 }
2417                 goto failed_scsi_cmnd;
2418         }
2419
2420         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2421
2422         if (use_timer)
2423                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2424
2425         retval = zfcp_fsf_req_send(req);
2426         if (unlikely(retval))
2427                 goto failed_scsi_cmnd;
2428
2429         goto out;
2430
2431 failed_scsi_cmnd:
2432         zfcp_unit_put(unit);
2433         zfcp_fsf_req_free(req);
2434         scsi_cmnd->host_scribble = NULL;
2435 out:
2436         spin_unlock(&adapter->req_q_lock);
2437         return retval;
2438 }
2439
2440 /**
2441  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2442  * @adapter: pointer to struct zfcp-adapter
2443  * @unit: pointer to struct zfcp_unit
2444  * @tm_flags: unsigned byte for task management flags
2445  * @req_flags: int request flags
2446  * Returns: on success pointer to struct fsf_req, NULL otherwise
2447  */
2448 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_adapter *adapter,
2449                                            struct zfcp_unit *unit,
2450                                            u8 tm_flags, int req_flags)
2451 {
2452         struct qdio_buffer_element *sbale;
2453         struct zfcp_fsf_req *req = NULL;
2454         struct fcp_cmnd_iu *fcp_cmnd_iu;
2455
2456         if (unlikely(!(atomic_read(&unit->status) &
2457                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2458                 return NULL;
2459
2460         spin_lock(&adapter->req_q_lock);
2461         if (!zfcp_fsf_sbal_available(adapter))
2462                 goto out;
2463         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
2464                                   adapter->pool.fsf_req_scsi);
2465         if (IS_ERR(req)) {
2466                 req = NULL;
2467                 goto out;
2468         }
2469
2470         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2471         req->data = unit;
2472         req->handler = zfcp_fsf_send_fcp_command_handler;
2473         req->qtcb->header.lun_handle = unit->handle;
2474         req->qtcb->header.port_handle = unit->port->handle;
2475         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2476         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2477         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2478                                                 sizeof(u32);
2479
2480         sbale = zfcp_qdio_sbale_req(req);
2481         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2482         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2483
2484         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2485         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2486         fcp_cmnd_iu->task_management_flags = tm_flags;
2487
2488         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2489         if (!zfcp_fsf_req_send(req))
2490                 goto out;
2491
2492         zfcp_fsf_req_free(req);
2493         req = NULL;
2494 out:
2495         spin_unlock(&adapter->req_q_lock);
2496         return req;
2497 }
2498
2499 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2500 {
2501         if (req->qtcb->header.fsf_status != FSF_GOOD)
2502                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2503 }
2504
2505 /**
2506  * zfcp_fsf_control_file - control file upload/download
2507  * @adapter: pointer to struct zfcp_adapter
2508  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2509  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2510  */
2511 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2512                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2513 {
2514         struct qdio_buffer_element *sbale;
2515         struct zfcp_fsf_req *req = NULL;
2516         struct fsf_qtcb_bottom_support *bottom;
2517         int direction, retval = -EIO, bytes;
2518
2519         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2520                 return ERR_PTR(-EOPNOTSUPP);
2521
2522         switch (fsf_cfdc->command) {
2523         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2524                 direction = SBAL_FLAGS0_TYPE_WRITE;
2525                 break;
2526         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2527                 direction = SBAL_FLAGS0_TYPE_READ;
2528                 break;
2529         default:
2530                 return ERR_PTR(-EINVAL);
2531         }
2532
2533         spin_lock_bh(&adapter->req_q_lock);
2534         if (zfcp_fsf_req_sbal_get(adapter))
2535                 goto out;
2536
2537         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2538         if (IS_ERR(req)) {
2539                 retval = -EPERM;
2540                 goto out;
2541         }
2542
2543         req->handler = zfcp_fsf_control_file_handler;
2544
2545         sbale = zfcp_qdio_sbale_req(req);
2546         sbale[0].flags |= direction;
2547
2548         bottom = &req->qtcb->bottom.support;
2549         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2550         bottom->option = fsf_cfdc->option;
2551
2552         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2553                                         FSF_MAX_SBALS_PER_REQ);
2554         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2555                 retval = -ENOMEM;
2556                 zfcp_fsf_req_free(req);
2557                 goto out;
2558         }
2559
2560         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2561         retval = zfcp_fsf_req_send(req);
2562 out:
2563         spin_unlock_bh(&adapter->req_q_lock);
2564
2565         if (!retval) {
2566                 wait_event(req->completion_wq,
2567                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2568                 return req;
2569         }
2570         return ERR_PTR(retval);
2571 }