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

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