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         default:
 530                 dev_err(&adapter->ccw_device->dev,
 531                         "Unknown or unsupported arbitrated loop "
 532                         "fibre channel topology detected\n");
 533                 zfcp_erp_adapter_shutdown(adapter, 0, "fsece_1", req);
 534                 return -EIO;
 535         }
 536
 537         return 0;
 538 }
 539
 540 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 541 {
 542         struct zfcp_adapter *adapter = req->adapter;
 543         struct fsf_qtcb *qtcb = req->qtcb;
 544         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 545         struct Scsi_Host *shost = adapter->scsi_host;
 546
 547         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 548                 return;
 549
 550         adapter->fsf_lic_version = bottom->lic_version;
 551         adapter->adapter_features = bottom->adapter_features;
 552         adapter->connection_features = bottom->connection_features;
 553         adapter->peer_wwpn = 0;
 554         adapter->peer_wwnn = 0;
 555         adapter->peer_d_id = 0;
 556
 557         switch (qtcb->header.fsf_status) {
 558         case FSF_GOOD:
 559                 if (zfcp_fsf_exchange_config_evaluate(req))
 560                         return;
 561
 562                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 563                         dev_err(&adapter->ccw_device->dev,
 564                                 "FCP adapter maximum QTCB size (%d bytes) "
 565                                 "is too small\n",
 566                                 bottom->max_qtcb_size);
 567                         zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh1", req);
 568                         return;
 569                 }
 570                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 571                                 &adapter->status);
 572                 break;
 573         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 574                 fc_host_node_name(shost) = 0;
 575                 fc_host_port_name(shost) = 0;
 576                 fc_host_port_id(shost) = 0;
 577                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 578                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 579                 adapter->hydra_version = 0;
 580
 581                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 582                                 &adapter->status);
 583
 584                 zfcp_fsf_link_down_info_eval(req, "fsecdh2",
 585                         &qtcb->header.fsf_status_qual.link_down_info);
 586                 break;
 587         default:
 588                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh3", req);
 589                 return;
 590         }
 591
 592         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 593                 adapter->hardware_version = bottom->hardware_version;
 594                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
 595                        min(FC_SERIAL_NUMBER_SIZE, 17));
 596                 EBCASC(fc_host_serial_number(shost),
 597                        min(FC_SERIAL_NUMBER_SIZE, 17));
 598         }
 599
 600         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 601                 dev_err(&adapter->ccw_device->dev,
 602                         "The FCP adapter only supports newer "
 603                         "control block versions\n");
 604                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh4", req);
 605                 return;
 606         }
 607         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 608                 dev_err(&adapter->ccw_device->dev,
 609                         "The FCP adapter only supports older "
 610                         "control block versions\n");
 611                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh5", req);
 612         }
 613 }
 614
 615 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 616 {
 617         struct zfcp_adapter *adapter = req->adapter;
 618         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 619         struct Scsi_Host *shost = adapter->scsi_host;
 620
 621         if (req->data)
 622                 memcpy(req->data, bottom, sizeof(*bottom));
 623
 624         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) {
 625                 fc_host_permanent_port_name(shost) = bottom->wwpn;
 626                 fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
 627         } else
 628                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 629         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 630         fc_host_supported_speeds(shost) = bottom->supported_speed;
 631 }
 632
 633 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 634 {
 635         struct fsf_qtcb *qtcb = req->qtcb;
 636
 637         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 638                 return;
 639
 640         switch (qtcb->header.fsf_status) {
 641         case FSF_GOOD:
 642                 zfcp_fsf_exchange_port_evaluate(req);
 643                 break;
 644         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 645                 zfcp_fsf_exchange_port_evaluate(req);
 646                 zfcp_fsf_link_down_info_eval(req, "fsepdh1",
 647                         &qtcb->header.fsf_status_qual.link_down_info);
 648                 break;
 649         }
 650 }
 651
 652 static int zfcp_fsf_sbal_check(struct zfcp_adapter *adapter)
 653 {
 654         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 655
 656         spin_lock_bh(&adapter->req_q_lock);
 657         if (atomic_read(&req_q->count))
 658                 return 1;
 659         spin_unlock_bh(&adapter->req_q_lock);
 660         return 0;
 661 }
 662
 663 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 664 {
 665         long ret;
 666
 667         spin_unlock_bh(&adapter->req_q_lock);
 668         ret = wait_event_interruptible_timeout(adapter->request_wq,
 669                                zfcp_fsf_sbal_check(adapter), 5 * HZ);
 670         if (ret > 0)
 671                 return 0;
 672         if (!ret)
 673                 atomic_inc(&adapter->qdio_outb_full);
 674
 675         spin_lock_bh(&adapter->req_q_lock);
 676         return -EIO;
 677 }
 678
 679 static struct zfcp_fsf_req *zfcp_fsf_alloc_noqtcb(mempool_t *pool)
 680 {
 681         struct zfcp_fsf_req *req;
 682         req = mempool_alloc(pool, GFP_ATOMIC);
 683         if (!req)
 684                 return NULL;
 685         memset(req, 0, sizeof(*req));
 686         req->pool = pool;
 687         return req;
 688 }
 689
 690 static struct zfcp_fsf_req *zfcp_fsf_alloc_qtcb(mempool_t *pool)
 691 {
 692         struct zfcp_fsf_req_qtcb *qtcb;
 693
 694         if (likely(pool))
 695                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
 696         else
 697                 qtcb = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 698                                         GFP_ATOMIC);
 699         if (unlikely(!qtcb))
 700                 return NULL;
 701
 702         memset(qtcb, 0, sizeof(*qtcb));
 703         qtcb->fsf_req.qtcb = &qtcb->qtcb;
 704         qtcb->fsf_req.pool = pool;
 705
 706         return &qtcb->fsf_req;
 707 }
 708
 709 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
 710                                                 u32 fsf_cmd, int req_flags,
 711                                                 mempool_t *pool)
 712 {
 713         struct qdio_buffer_element *sbale;
 714
 715         struct zfcp_fsf_req *req;
 716         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 717
 718         if (req_flags & ZFCP_REQ_NO_QTCB)
 719                 req = zfcp_fsf_alloc_noqtcb(pool);
 720         else
 721                 req = zfcp_fsf_alloc_qtcb(pool);
 722
 723         if (unlikely(!req))
 724                 return ERR_PTR(-EIO);
 725
 726         if (adapter->req_no == 0)
 727                 adapter->req_no++;
 728
 729         INIT_LIST_HEAD(&req->list);
 730         init_timer(&req->timer);
 731         init_waitqueue_head(&req->completion_wq);
 732
 733         req->adapter = adapter;
 734         req->fsf_command = fsf_cmd;
 735         req->req_id = adapter->req_no;
 736         req->sbal_number = 1;
 737         req->sbal_first = req_q->first;
 738         req->sbal_last = req_q->first;
 739         req->sbale_curr = 1;
 740
 741         sbale = zfcp_qdio_sbale_req(req);
 742         sbale[0].addr = (void *) req->req_id;
 743         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 744
 745         if (likely(req->qtcb)) {
 746                 req->qtcb->prefix.req_seq_no = req->adapter->fsf_req_seq_no;
 747                 req->qtcb->prefix.req_id = req->req_id;
 748                 req->qtcb->prefix.ulp_info = 26;
 749                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command];
 750                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
 751                 req->qtcb->header.req_handle = req->req_id;
 752                 req->qtcb->header.fsf_command = req->fsf_command;
 753                 req->seq_no = adapter->fsf_req_seq_no;
 754                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 755                 sbale[1].addr = (void *) req->qtcb;
 756                 sbale[1].length = sizeof(struct fsf_qtcb);
 757         }
 758
 759         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) {
 760                 zfcp_fsf_req_free(req);
 761                 return ERR_PTR(-EIO);
 762         }
 763
 764         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP))
 765                 req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
 766
 767         return req;
 768 }
 769
 770 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 771 {
 772         struct zfcp_adapter *adapter = req->adapter;
 773         unsigned long        flags;
 774         int                  idx;
 775         int                  with_qtcb = (req->qtcb != NULL);
 776
 777         /* put allocated FSF request into hash table */
 778         spin_lock_irqsave(&adapter->req_list_lock, flags);
 779         idx = zfcp_reqlist_hash(req->req_id);
 780         list_add_tail(&req->list, &adapter->req_list[idx]);
 781         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 782
 783         req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
 784         req->issued = get_clock();
 785         if (zfcp_qdio_send(req)) {
 786                 del_timer(&req->timer);
 787                 spin_lock_irqsave(&adapter->req_list_lock, flags);
 788                 /* lookup request again, list might have changed */
 789                 if (zfcp_reqlist_find_safe(adapter, req))
 790                         zfcp_reqlist_remove(adapter, req);
 791                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 792                 zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1", req);
 793                 return -EIO;
 794         }
 795
 796         /* Don't increase for unsolicited status */
 797         if (with_qtcb)
 798                 adapter->fsf_req_seq_no++;
 799         adapter->req_no++;
 800
 801         return 0;
 802 }
 803
 804 /**
 805  * zfcp_fsf_status_read - send status read request
 806  * @adapter: pointer to struct zfcp_adapter
 807  * @req_flags: request flags
 808  * Returns: 0 on success, ERROR otherwise
 809  */
 810 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 811 {
 812         struct zfcp_fsf_req *req;
 813         struct fsf_status_read_buffer *sr_buf;
 814         struct qdio_buffer_element *sbale;
 815         int retval = -EIO;
 816
 817         spin_lock_bh(&adapter->req_q_lock);
 818         if (zfcp_fsf_req_sbal_get(adapter))
 819                 goto out;
 820
 821         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 822                                   ZFCP_REQ_NO_QTCB,
 823                                   adapter->pool.fsf_req_status_read);
 824         if (IS_ERR(req)) {
 825                 retval = PTR_ERR(req);
 826                 goto out;
 827         }
 828
 829         sbale = zfcp_qdio_sbale_req(req);
 830         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 831         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 832         req->sbale_curr = 2;
 833
 834         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 835         if (!sr_buf) {
 836                 retval = -ENOMEM;
 837                 goto failed_buf;
 838         }
 839         memset(sr_buf, 0, sizeof(*sr_buf));
 840         req->data = sr_buf;
 841         sbale = zfcp_qdio_sbale_curr(req);
 842         sbale->addr = (void *) sr_buf;
 843         sbale->length = sizeof(*sr_buf);
 844
 845         retval = zfcp_fsf_req_send(req);
 846         if (retval)
 847                 goto failed_req_send;
 848
 849         goto out;
 850
 851 failed_req_send:
 852         mempool_free(sr_buf, adapter->pool.data_status_read);
 853 failed_buf:
 854         zfcp_fsf_req_free(req);
 855         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 856 out:
 857         spin_unlock_bh(&adapter->req_q_lock);
 858         return retval;
 859 }
 860
 861 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 862 {
 863         struct zfcp_unit *unit = req->data;
 864         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 865
 866         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 867                 return;
 868
 869         switch (req->qtcb->header.fsf_status) {
 870         case FSF_PORT_HANDLE_NOT_VALID:
 871                 if (fsq->word[0] == fsq->word[1]) {
 872                         zfcp_erp_adapter_reopen(unit->port->adapter, 0,
 873                                                 "fsafch1", req);
 874                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 875                 }
 876                 break;
 877         case FSF_LUN_HANDLE_NOT_VALID:
 878                 if (fsq->word[0] == fsq->word[1]) {
 879                         zfcp_erp_port_reopen(unit->port, 0, "fsafch2", req);
 880                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 881                 }
 882                 break;
 883         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 884                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 885                 break;
 886         case FSF_PORT_BOXED:
 887                 zfcp_erp_port_boxed(unit->port, "fsafch3", req);
 888                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 889                                ZFCP_STATUS_FSFREQ_RETRY;
 890                 break;
 891         case FSF_LUN_BOXED:
 892                 zfcp_erp_unit_boxed(unit, "fsafch4", req);
 893                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 894                                ZFCP_STATUS_FSFREQ_RETRY;
 895                 break;
 896         case FSF_ADAPTER_STATUS_AVAILABLE:
 897                 switch (fsq->word[0]) {
 898                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 899                         zfcp_test_link(unit->port);
 900                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 901                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 902                         break;
 903                 }
 904                 break;
 905         case FSF_GOOD:
 906                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 907                 break;
 908         }
 909 }
 910
 911 /**
 912  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 913  * @old_req_id: unsigned long
 914  * @unit: pointer to struct zfcp_unit
 915  * Returns: pointer to struct zfcp_fsf_req
 916  */
 917
 918 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 919                                                 struct zfcp_unit *unit)
 920 {
 921         struct qdio_buffer_element *sbale;
 922         struct zfcp_fsf_req *req = NULL;
 923         struct zfcp_adapter *adapter = unit->port->adapter;
 924
 925         spin_lock_bh(&adapter->req_q_lock);
 926         if (zfcp_fsf_req_sbal_get(adapter))
 927                 goto out;
 928         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 929                                   0, adapter->pool.fsf_req_abort);
 930         if (IS_ERR(req)) {
 931                 req = NULL;
 932                 goto out;
 933         }
 934
 935         if (unlikely(!(atomic_read(&unit->status) &
 936                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 937                 goto out_error_free;
 938
 939         sbale = zfcp_qdio_sbale_req(req);
 940         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 941         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 942
 943         req->data = unit;
 944         req->handler = zfcp_fsf_abort_fcp_command_handler;
 945         req->qtcb->header.lun_handle = unit->handle;
 946         req->qtcb->header.port_handle = unit->port->handle;
 947         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 948
 949         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 950         if (!zfcp_fsf_req_send(req))
 951                 goto out;
 952
 953 out_error_free:
 954         zfcp_fsf_req_free(req);
 955         req = NULL;
 956 out:
 957         spin_unlock_bh(&adapter->req_q_lock);
 958         return req;
 959 }
 960
 961 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 962 {
 963         struct zfcp_adapter *adapter = req->adapter;
 964         struct zfcp_send_ct *send_ct = req->data;
 965         struct fsf_qtcb_header *header = &req->qtcb->header;
 966
 967         send_ct->status = -EINVAL;
 968
 969         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 970                 goto skip_fsfstatus;
 971
 972         switch (header->fsf_status) {
 973         case FSF_GOOD:
 974                 zfcp_san_dbf_event_ct_response(req);
 975                 send_ct->status = 0;
 976                 break;
 977         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 978                 zfcp_fsf_class_not_supp(req);
 979                 break;
 980         case FSF_ADAPTER_STATUS_AVAILABLE:
 981                 switch (header->fsf_status_qual.word[0]){
 982                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 983                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 984                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 985                         break;
 986                 }
 987                 break;
 988         case FSF_ACCESS_DENIED:
 989                 break;
 990         case FSF_PORT_BOXED:
 991                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 992                                ZFCP_STATUS_FSFREQ_RETRY;
 993                 break;
 994         case FSF_PORT_HANDLE_NOT_VALID:
 995                 zfcp_erp_adapter_reopen(adapter, 0, "fsscth1", req);
 996         case FSF_GENERIC_COMMAND_REJECTED:
 997         case FSF_PAYLOAD_SIZE_MISMATCH:
 998         case FSF_REQUEST_SIZE_TOO_LARGE:
 999         case FSF_RESPONSE_SIZE_TOO_LARGE:
1000         case FSF_SBAL_MISMATCH:
1001                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1002                 break;
1003         }
1004
1005 skip_fsfstatus:
1006         if (send_ct->handler)
1007                 send_ct->handler(send_ct->handler_data);
1008 }
1009
1010 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1011                                        struct scatterlist *sg_req,
1012                                        struct scatterlist *sg_resp,
1013                                        int max_sbals)
1014 {
1015         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(req);
1016         u32 feat = req->adapter->adapter_features;
1017         int bytes;
1018
1019         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1020                 if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
1021                     !sg_is_last(sg_req) || !sg_is_last(sg_resp))
1022                         return -EOPNOTSUPP;
1023
1024                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1025                 sbale[2].addr   = sg_virt(sg_req);
1026                 sbale[2].length = sg_req->length;
1027                 sbale[3].addr   = sg_virt(sg_resp);
1028                 sbale[3].length = sg_resp->length;
1029                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1030                 return 0;
1031         }
1032
1033         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1034                                         sg_req, max_sbals);
1035         if (bytes <= 0)
1036                 return -ENOMEM;
1037         req->qtcb->bottom.support.req_buf_length = bytes;
1038         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1039
1040         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
1041                                         sg_resp, max_sbals);
1042         if (bytes <= 0)
1043                 return -ENOMEM;
1044         req->qtcb->bottom.support.resp_buf_length = bytes;
1045
1046         return 0;
1047 }
1048
1049 /**
1050  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1051  * @ct: pointer to struct zfcp_send_ct with data for request
1052  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1053  * @erp_action: if non-null the Generic Service request sent within ERP
1054  */
1055 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1056                      struct zfcp_erp_action *erp_action)
1057 {
1058         struct zfcp_wka_port *wka_port = ct->wka_port;
1059         struct zfcp_adapter *adapter = wka_port->adapter;
1060         struct zfcp_fsf_req *req;
1061         int ret = -EIO;
1062
1063         spin_lock_bh(&adapter->req_q_lock);
1064         if (zfcp_fsf_req_sbal_get(adapter))
1065                 goto out;
1066
1067         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1068                                   ZFCP_REQ_AUTO_CLEANUP, pool);
1069         if (IS_ERR(req)) {
1070                 ret = PTR_ERR(req);
1071                 goto out;
1072         }
1073
1074         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1075                                           FSF_MAX_SBALS_PER_REQ);
1076         if (ret)
1077                 goto failed_send;
1078
1079         req->handler = zfcp_fsf_send_ct_handler;
1080         req->qtcb->header.port_handle = wka_port->handle;
1081         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1082         req->qtcb->bottom.support.timeout = ct->timeout;
1083         req->data = ct;
1084
1085         zfcp_san_dbf_event_ct_request(req);
1086
1087         if (erp_action) {
1088                 erp_action->fsf_req = req;
1089                 req->erp_action = erp_action;
1090                 zfcp_fsf_start_erp_timer(req);
1091         } else
1092                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1093
1094         ret = zfcp_fsf_req_send(req);
1095         if (ret)
1096                 goto failed_send;
1097
1098         goto out;
1099
1100 failed_send:
1101         zfcp_fsf_req_free(req);
1102         if (erp_action)
1103                 erp_action->fsf_req = NULL;
1104 out:
1105         spin_unlock_bh(&adapter->req_q_lock);
1106         return ret;
1107 }
1108
1109 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1110 {
1111         struct zfcp_send_els *send_els = req->data;
1112         struct zfcp_port *port = send_els->port;
1113         struct fsf_qtcb_header *header = &req->qtcb->header;
1114
1115         send_els->status = -EINVAL;
1116
1117         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1118                 goto skip_fsfstatus;
1119
1120         switch (header->fsf_status) {
1121         case FSF_GOOD:
1122                 zfcp_san_dbf_event_els_response(req);
1123                 send_els->status = 0;
1124                 break;
1125         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1126                 zfcp_fsf_class_not_supp(req);
1127                 break;
1128         case FSF_ADAPTER_STATUS_AVAILABLE:
1129                 switch (header->fsf_status_qual.word[0]){
1130                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1131                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1132                                 zfcp_test_link(port);
1133                         /*fall through */
1134                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1135                 case FSF_SQ_RETRY_IF_POSSIBLE:
1136                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1137                         break;
1138                 }
1139                 break;
1140         case FSF_ELS_COMMAND_REJECTED:
1141         case FSF_PAYLOAD_SIZE_MISMATCH:
1142         case FSF_REQUEST_SIZE_TOO_LARGE:
1143         case FSF_RESPONSE_SIZE_TOO_LARGE:
1144                 break;
1145         case FSF_ACCESS_DENIED:
1146                 zfcp_fsf_access_denied_port(req, port);
1147                 break;
1148         case FSF_SBAL_MISMATCH:
1149                 /* should never occure, avoided in zfcp_fsf_send_els */
1150                 /* fall through */
1151         default:
1152                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1153                 break;
1154         }
1155 skip_fsfstatus:
1156         if (send_els->handler)
1157                 send_els->handler(send_els->handler_data);
1158 }
1159
1160 /**
1161  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1162  * @els: pointer to struct zfcp_send_els with data for the command
1163  */
1164 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1165 {
1166         struct zfcp_fsf_req *req;
1167         struct zfcp_adapter *adapter = els->adapter;
1168         struct fsf_qtcb_bottom_support *bottom;
1169         int ret = -EIO;
1170
1171         spin_lock_bh(&adapter->req_q_lock);
1172         if (zfcp_fsf_req_sbal_get(adapter))
1173                 goto out;
1174         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1175                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
1176         if (IS_ERR(req)) {
1177                 ret = PTR_ERR(req);
1178                 goto out;
1179         }
1180
1181         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1182
1183         if (ret)
1184                 goto failed_send;
1185
1186         bottom = &req->qtcb->bottom.support;
1187         req->handler = zfcp_fsf_send_els_handler;
1188         bottom->d_id = els->d_id;
1189         bottom->service_class = FSF_CLASS_3;
1190         bottom->timeout = 2 * R_A_TOV;
1191         req->data = els;
1192
1193         zfcp_san_dbf_event_els_request(req);
1194
1195         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1196         ret = zfcp_fsf_req_send(req);
1197         if (ret)
1198                 goto failed_send;
1199
1200         goto out;
1201
1202 failed_send:
1203         zfcp_fsf_req_free(req);
1204 out:
1205         spin_unlock_bh(&adapter->req_q_lock);
1206         return ret;
1207 }
1208
1209 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1210 {
1211         struct qdio_buffer_element *sbale;
1212         struct zfcp_fsf_req *req;
1213         struct zfcp_adapter *adapter = erp_action->adapter;
1214         int retval = -EIO;
1215
1216         spin_lock_bh(&adapter->req_q_lock);
1217         if (zfcp_fsf_req_sbal_get(adapter))
1218                 goto out;
1219         req = zfcp_fsf_req_create(adapter,
1220                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
1221                                   ZFCP_REQ_AUTO_CLEANUP,
1222                                   adapter->pool.fsf_req_erp);
1223         if (IS_ERR(req)) {
1224                 retval = PTR_ERR(req);
1225                 goto out;
1226         }
1227
1228         sbale = zfcp_qdio_sbale_req(req);
1229         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1230         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1231
1232         req->qtcb->bottom.config.feature_selection =
1233                         FSF_FEATURE_CFDC |
1234                         FSF_FEATURE_LUN_SHARING |
1235                         FSF_FEATURE_NOTIFICATION_LOST |
1236                         FSF_FEATURE_UPDATE_ALERT;
1237         req->erp_action = erp_action;
1238         req->handler = zfcp_fsf_exchange_config_data_handler;
1239         erp_action->fsf_req = req;
1240
1241         zfcp_fsf_start_erp_timer(req);
1242         retval = zfcp_fsf_req_send(req);
1243         if (retval) {
1244                 zfcp_fsf_req_free(req);
1245                 erp_action->fsf_req = NULL;
1246         }
1247 out:
1248         spin_unlock_bh(&adapter->req_q_lock);
1249         return retval;
1250 }
1251
1252 int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1253                                        struct fsf_qtcb_bottom_config *data)
1254 {
1255         struct qdio_buffer_element *sbale;
1256         struct zfcp_fsf_req *req = NULL;
1257         int retval = -EIO;
1258
1259         spin_lock_bh(&adapter->req_q_lock);
1260         if (zfcp_fsf_req_sbal_get(adapter))
1261                 goto out_unlock;
1262
1263         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1264                                   0, NULL);
1265         if (IS_ERR(req)) {
1266                 retval = PTR_ERR(req);
1267                 goto out_unlock;
1268         }
1269
1270         sbale = zfcp_qdio_sbale_req(req);
1271         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1272         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1273         req->handler = zfcp_fsf_exchange_config_data_handler;
1274
1275         req->qtcb->bottom.config.feature_selection =
1276                         FSF_FEATURE_CFDC |
1277                         FSF_FEATURE_LUN_SHARING |
1278                         FSF_FEATURE_NOTIFICATION_LOST |
1279                         FSF_FEATURE_UPDATE_ALERT;
1280
1281         if (data)
1282                 req->data = data;
1283
1284         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1285         retval = zfcp_fsf_req_send(req);
1286         spin_unlock_bh(&adapter->req_q_lock);
1287         if (!retval)
1288                 wait_event(req->completion_wq,
1289                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1290
1291         zfcp_fsf_req_free(req);
1292         return retval;
1293
1294 out_unlock:
1295         spin_unlock_bh(&adapter->req_q_lock);
1296         return retval;
1297 }
1298
1299 /**
1300  * zfcp_fsf_exchange_port_data - request information about local port
1301  * @erp_action: ERP action for the adapter for which port data is requested
1302  * Returns: 0 on success, error otherwise
1303  */
1304 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1305 {
1306         struct qdio_buffer_element *sbale;
1307         struct zfcp_fsf_req *req;
1308         struct zfcp_adapter *adapter = erp_action->adapter;
1309         int retval = -EIO;
1310
1311         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1312                 return -EOPNOTSUPP;
1313
1314         spin_lock_bh(&adapter->req_q_lock);
1315         if (zfcp_fsf_req_sbal_get(adapter))
1316                 goto out;
1317         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
1318                                   ZFCP_REQ_AUTO_CLEANUP,
1319                                   adapter->pool.fsf_req_erp);
1320         if (IS_ERR(req)) {
1321                 retval = PTR_ERR(req);
1322                 goto out;
1323         }
1324
1325         sbale = zfcp_qdio_sbale_req(req);
1326         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1327         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1328
1329         req->handler = zfcp_fsf_exchange_port_data_handler;
1330         req->erp_action = erp_action;
1331         erp_action->fsf_req = req;
1332
1333         zfcp_fsf_start_erp_timer(req);
1334         retval = zfcp_fsf_req_send(req);
1335         if (retval) {
1336                 zfcp_fsf_req_free(req);
1337                 erp_action->fsf_req = NULL;
1338         }
1339 out:
1340         spin_unlock_bh(&adapter->req_q_lock);
1341         return retval;
1342 }
1343
1344 /**
1345  * zfcp_fsf_exchange_port_data_sync - request information about local port
1346  * @adapter: pointer to struct zfcp_adapter
1347  * @data: pointer to struct fsf_qtcb_bottom_port
1348  * Returns: 0 on success, error otherwise
1349  */
1350 int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
1351                                      struct fsf_qtcb_bottom_port *data)
1352 {
1353         struct qdio_buffer_element *sbale;
1354         struct zfcp_fsf_req *req = NULL;
1355         int retval = -EIO;
1356
1357         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1358                 return -EOPNOTSUPP;
1359
1360         spin_lock_bh(&adapter->req_q_lock);
1361         if (zfcp_fsf_req_sbal_get(adapter))
1362                 goto out_unlock;
1363
1364         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
1365                                   NULL);
1366         if (IS_ERR(req)) {
1367                 retval = PTR_ERR(req);
1368                 goto out_unlock;
1369         }
1370
1371         if (data)
1372                 req->data = data;
1373
1374         sbale = zfcp_qdio_sbale_req(req);
1375         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1376         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1377
1378         req->handler = zfcp_fsf_exchange_port_data_handler;
1379         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1380         retval = zfcp_fsf_req_send(req);
1381         spin_unlock_bh(&adapter->req_q_lock);
1382
1383         if (!retval)
1384                 wait_event(req->completion_wq,
1385                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1386         zfcp_fsf_req_free(req);
1387
1388         return retval;
1389
1390 out_unlock:
1391         spin_unlock_bh(&adapter->req_q_lock);
1392         return retval;
1393 }
1394
1395 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1396 {
1397         struct zfcp_port *port = req->data;
1398         struct fsf_qtcb_header *header = &req->qtcb->header;
1399         struct fsf_plogi *plogi;
1400
1401         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1402                 return;
1403
1404         switch (header->fsf_status) {
1405         case FSF_PORT_ALREADY_OPEN:
1406                 break;
1407         case FSF_ACCESS_DENIED:
1408                 zfcp_fsf_access_denied_port(req, port);
1409                 break;
1410         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1411                 dev_warn(&req->adapter->ccw_device->dev,
1412                          "Not enough FCP adapter resources to open "
1413                          "remote port 0x%016Lx\n",
1414                          (unsigned long long)port->wwpn);
1415                 zfcp_erp_port_failed(port, "fsoph_1", req);
1416                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1417                 break;
1418         case FSF_ADAPTER_STATUS_AVAILABLE:
1419                 switch (header->fsf_status_qual.word[0]) {
1420                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1421                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1422                 case FSF_SQ_NO_RETRY_POSSIBLE:
1423                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1424                         break;
1425                 }
1426                 break;
1427         case FSF_GOOD:
1428                 port->handle = header->port_handle;
1429                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1430                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1431                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1432                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1433                                   &port->status);
1434                 /* check whether D_ID has changed during open */
1435                 /*
1436                  * FIXME: This check is not airtight, as the FCP channel does
1437                  * not monitor closures of target port connections caused on
1438                  * the remote side. Thus, they might miss out on invalidating
1439                  * locally cached WWPNs (and other N_Port parameters) of gone
1440                  * target ports. So, our heroic attempt to make things safe
1441                  * could be undermined by 'open port' response data tagged with
1442                  * obsolete WWPNs. Another reason to monitor potential
1443                  * connection closures ourself at least (by interpreting
1444                  * incoming ELS' and unsolicited status). It just crosses my
1445                  * mind that one should be able to cross-check by means of
1446                  * another GID_PN straight after a port has been opened.
1447                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1448                  */
1449                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1450                 if (req->qtcb->bottom.support.els1_length >=
1451                     FSF_PLOGI_MIN_LEN) {
1452                         if (plogi->serv_param.wwpn != port->wwpn)
1453                                 port->d_id = 0;
1454                         else {
1455                                 port->wwnn = plogi->serv_param.wwnn;
1456                                 zfcp_fc_plogi_evaluate(port, plogi);
1457                         }
1458                 }
1459                 break;
1460         case FSF_UNKNOWN_OP_SUBTYPE:
1461                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1462                 break;
1463         }
1464 }
1465
1466 /**
1467  * zfcp_fsf_open_port - create and send open port request
1468  * @erp_action: pointer to struct zfcp_erp_action
1469  * Returns: 0 on success, error otherwise
1470  */
1471 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1472 {
1473         struct qdio_buffer_element *sbale;
1474         struct zfcp_adapter *adapter = erp_action->adapter;
1475         struct zfcp_fsf_req *req;
1476         int retval = -EIO;
1477
1478         spin_lock_bh(&adapter->req_q_lock);
1479         if (zfcp_fsf_req_sbal_get(adapter))
1480                 goto out;
1481
1482         req = zfcp_fsf_req_create(adapter,
1483                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1484                                   ZFCP_REQ_AUTO_CLEANUP,
1485                                   adapter->pool.fsf_req_erp);
1486         if (IS_ERR(req)) {
1487                 retval = PTR_ERR(req);
1488                 goto out;
1489         }
1490
1491         sbale = zfcp_qdio_sbale_req(req);
1492         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1493         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1494
1495         req->handler = zfcp_fsf_open_port_handler;
1496         req->qtcb->bottom.support.d_id = erp_action->port->d_id;
1497         req->data = erp_action->port;
1498         req->erp_action = erp_action;
1499         erp_action->fsf_req = req;
1500
1501         zfcp_fsf_start_erp_timer(req);
1502         retval = zfcp_fsf_req_send(req);
1503         if (retval) {
1504                 zfcp_fsf_req_free(req);
1505                 erp_action->fsf_req = NULL;
1506         }
1507 out:
1508         spin_unlock_bh(&adapter->req_q_lock);
1509         return retval;
1510 }
1511
1512 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1513 {
1514         struct zfcp_port *port = req->data;
1515
1516         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1517                 return;
1518
1519         switch (req->qtcb->header.fsf_status) {
1520         case FSF_PORT_HANDLE_NOT_VALID:
1521                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1", req);
1522                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1523                 break;
1524         case FSF_ADAPTER_STATUS_AVAILABLE:
1525                 break;
1526         case FSF_GOOD:
1527                 zfcp_erp_modify_port_status(port, "fscph_2", req,
1528                                             ZFCP_STATUS_COMMON_OPEN,
1529                                             ZFCP_CLEAR);
1530                 break;
1531         }
1532 }
1533
1534 /**
1535  * zfcp_fsf_close_port - create and send close port request
1536  * @erp_action: pointer to struct zfcp_erp_action
1537  * Returns: 0 on success, error otherwise
1538  */
1539 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1540 {
1541         struct qdio_buffer_element *sbale;
1542         struct zfcp_adapter *adapter = erp_action->adapter;
1543         struct zfcp_fsf_req *req;
1544         int retval = -EIO;
1545
1546         spin_lock_bh(&adapter->req_q_lock);
1547         if (zfcp_fsf_req_sbal_get(adapter))
1548                 goto out;
1549
1550         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1551                                   ZFCP_REQ_AUTO_CLEANUP,
1552                                   adapter->pool.fsf_req_erp);
1553         if (IS_ERR(req)) {
1554                 retval = PTR_ERR(req);
1555                 goto out;
1556         }
1557
1558         sbale = zfcp_qdio_sbale_req(req);
1559         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1560         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1561
1562         req->handler = zfcp_fsf_close_port_handler;
1563         req->data = erp_action->port;
1564         req->erp_action = erp_action;
1565         req->qtcb->header.port_handle = erp_action->port->handle;
1566         erp_action->fsf_req = req;
1567
1568         zfcp_fsf_start_erp_timer(req);
1569         retval = zfcp_fsf_req_send(req);
1570         if (retval) {
1571                 zfcp_fsf_req_free(req);
1572                 erp_action->fsf_req = NULL;
1573         }
1574 out:
1575         spin_unlock_bh(&adapter->req_q_lock);
1576         return retval;
1577 }
1578
1579 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1580 {
1581         struct zfcp_wka_port *wka_port = req->data;
1582         struct fsf_qtcb_header *header = &req->qtcb->header;
1583
1584         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1585                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1586                 goto out;
1587         }
1588
1589         switch (header->fsf_status) {
1590         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1591                 dev_warn(&req->adapter->ccw_device->dev,
1592                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1593         case FSF_ADAPTER_STATUS_AVAILABLE:
1594                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1595         case FSF_ACCESS_DENIED:
1596                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1597                 break;
1598         case FSF_PORT_ALREADY_OPEN:
1599                 break;
1600         case FSF_GOOD:
1601                 wka_port->handle = header->port_handle;
1602                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1603         }
1604 out:
1605         wake_up(&wka_port->completion_wq);
1606 }
1607
1608 /**
1609  * zfcp_fsf_open_wka_port - create and send open wka-port request
1610  * @wka_port: pointer to struct zfcp_wka_port
1611  * Returns: 0 on success, error otherwise
1612  */
1613 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1614 {
1615         struct qdio_buffer_element *sbale;
1616         struct zfcp_adapter *adapter = wka_port->adapter;
1617         struct zfcp_fsf_req *req;
1618         int retval = -EIO;
1619
1620         spin_lock_bh(&adapter->req_q_lock);
1621         if (zfcp_fsf_req_sbal_get(adapter))
1622                 goto out;
1623
1624         req = zfcp_fsf_req_create(adapter,
1625                                   FSF_QTCB_OPEN_PORT_WITH_DID,
1626                                   ZFCP_REQ_AUTO_CLEANUP,
1627                                   adapter->pool.fsf_req_erp);
1628         if (unlikely(IS_ERR(req))) {
1629                 retval = PTR_ERR(req);
1630                 goto out;
1631         }
1632
1633         sbale = zfcp_qdio_sbale_req(req);
1634         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1635         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1636
1637         req->handler = zfcp_fsf_open_wka_port_handler;
1638         req->qtcb->bottom.support.d_id = wka_port->d_id;
1639         req->data = wka_port;
1640
1641         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1642         retval = zfcp_fsf_req_send(req);
1643         if (retval)
1644                 zfcp_fsf_req_free(req);
1645 out:
1646         spin_unlock_bh(&adapter->req_q_lock);
1647         return retval;
1648 }
1649
1650 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1651 {
1652         struct zfcp_wka_port *wka_port = req->data;
1653
1654         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1655                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1656                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1", req);
1657         }
1658
1659         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1660         wake_up(&wka_port->completion_wq);
1661 }
1662
1663 /**
1664  * zfcp_fsf_close_wka_port - create and send close wka port request
1665  * @erp_action: pointer to struct zfcp_erp_action
1666  * Returns: 0 on success, error otherwise
1667  */
1668 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1669 {
1670         struct qdio_buffer_element *sbale;
1671         struct zfcp_adapter *adapter = wka_port->adapter;
1672         struct zfcp_fsf_req *req;
1673         int retval = -EIO;
1674
1675         spin_lock_bh(&adapter->req_q_lock);
1676         if (zfcp_fsf_req_sbal_get(adapter))
1677                 goto out;
1678
1679         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
1680                                   ZFCP_REQ_AUTO_CLEANUP,
1681                                   adapter->pool.fsf_req_erp);
1682         if (unlikely(IS_ERR(req))) {
1683                 retval = PTR_ERR(req);
1684                 goto out;
1685         }
1686
1687         sbale = zfcp_qdio_sbale_req(req);
1688         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1689         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1690
1691         req->handler = zfcp_fsf_close_wka_port_handler;
1692         req->data = wka_port;
1693         req->qtcb->header.port_handle = wka_port->handle;
1694
1695         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1696         retval = zfcp_fsf_req_send(req);
1697         if (retval)
1698                 zfcp_fsf_req_free(req);
1699 out:
1700         spin_unlock_bh(&adapter->req_q_lock);
1701         return retval;
1702 }
1703
1704 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1705 {
1706         struct zfcp_port *port = req->data;
1707         struct fsf_qtcb_header *header = &req->qtcb->header;
1708         struct zfcp_unit *unit;
1709
1710         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1711                 return;
1712
1713         switch (header->fsf_status) {
1714         case FSF_PORT_HANDLE_NOT_VALID:
1715                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1", req);
1716                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1717                 break;
1718         case FSF_ACCESS_DENIED:
1719                 zfcp_fsf_access_denied_port(req, port);
1720                 break;
1721         case FSF_PORT_BOXED:
1722                 zfcp_erp_port_boxed(port, "fscpph2", req);
1723                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1724                                ZFCP_STATUS_FSFREQ_RETRY;
1725                 /* can't use generic zfcp_erp_modify_port_status because
1726                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1727                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1728                 list_for_each_entry(unit, &port->unit_list_head, list)
1729                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1730                                           &unit->status);
1731                 break;
1732         case FSF_ADAPTER_STATUS_AVAILABLE:
1733                 switch (header->fsf_status_qual.word[0]) {
1734                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1735                         /* fall through */
1736                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1737                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1738                         break;
1739                 }
1740                 break;
1741         case FSF_GOOD:
1742                 /* can't use generic zfcp_erp_modify_port_status because
1743                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1744                  */
1745                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1746                 list_for_each_entry(unit, &port->unit_list_head, list)
1747                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1748                                           &unit->status);
1749                 break;
1750         }
1751 }
1752
1753 /**
1754  * zfcp_fsf_close_physical_port - close physical port
1755  * @erp_action: pointer to struct zfcp_erp_action
1756  * Returns: 0 on success
1757  */
1758 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1759 {
1760         struct qdio_buffer_element *sbale;
1761         struct zfcp_adapter *adapter = erp_action->adapter;
1762         struct zfcp_fsf_req *req;
1763         int retval = -EIO;
1764
1765         spin_lock_bh(&adapter->req_q_lock);
1766         if (zfcp_fsf_req_sbal_get(adapter))
1767                 goto out;
1768
1769         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1770                                   ZFCP_REQ_AUTO_CLEANUP,
1771                                   adapter->pool.fsf_req_erp);
1772         if (IS_ERR(req)) {
1773                 retval = PTR_ERR(req);
1774                 goto out;
1775         }
1776
1777         sbale = zfcp_qdio_sbale_req(req);
1778         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1779         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1780
1781         req->data = erp_action->port;
1782         req->qtcb->header.port_handle = erp_action->port->handle;
1783         req->erp_action = erp_action;
1784         req->handler = zfcp_fsf_close_physical_port_handler;
1785         erp_action->fsf_req = req;
1786
1787         zfcp_fsf_start_erp_timer(req);
1788         retval = zfcp_fsf_req_send(req);
1789         if (retval) {
1790                 zfcp_fsf_req_free(req);
1791                 erp_action->fsf_req = NULL;
1792         }
1793 out:
1794         spin_unlock_bh(&adapter->req_q_lock);
1795         return retval;
1796 }
1797
1798 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1799 {
1800         struct zfcp_adapter *adapter = req->adapter;
1801         struct zfcp_unit *unit = req->data;
1802         struct fsf_qtcb_header *header = &req->qtcb->header;
1803         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1804         struct fsf_queue_designator *queue_designator =
1805                                 &header->fsf_status_qual.fsf_queue_designator;
1806         int exclusive, readwrite;
1807
1808         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1809                 return;
1810
1811         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1812                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1813                           ZFCP_STATUS_UNIT_SHARED |
1814                           ZFCP_STATUS_UNIT_READONLY,
1815                           &unit->status);
1816
1817         switch (header->fsf_status) {
1818
1819         case FSF_PORT_HANDLE_NOT_VALID:
1820                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fsouh_1", req);
1821                 /* fall through */
1822         case FSF_LUN_ALREADY_OPEN:
1823                 break;
1824         case FSF_ACCESS_DENIED:
1825                 zfcp_fsf_access_denied_unit(req, unit);
1826                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1827                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1828                 break;
1829         case FSF_PORT_BOXED:
1830                 zfcp_erp_port_boxed(unit->port, "fsouh_2", req);
1831                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1832                                ZFCP_STATUS_FSFREQ_RETRY;
1833                 break;
1834         case FSF_LUN_SHARING_VIOLATION:
1835                 if (header->fsf_status_qual.word[0])
1836                         dev_warn(&adapter->ccw_device->dev,
1837                                  "LUN 0x%Lx on port 0x%Lx is already in "
1838                                  "use by CSS%d, MIF Image ID %x\n",
1839                                  (unsigned long long)unit->fcp_lun,
1840                                  (unsigned long long)unit->port->wwpn,
1841                                  queue_designator->cssid,
1842                                  queue_designator->hla);
1843                 else
1844                         zfcp_act_eval_err(adapter,
1845                                           header->fsf_status_qual.word[2]);
1846                 zfcp_erp_unit_access_denied(unit, "fsouh_3", req);
1847                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1848                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1849                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1850                 break;
1851         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1852                 dev_warn(&adapter->ccw_device->dev,
1853                          "No handle is available for LUN "
1854                          "0x%016Lx on port 0x%016Lx\n",
1855                          (unsigned long long)unit->fcp_lun,
1856                          (unsigned long long)unit->port->wwpn);
1857                 zfcp_erp_unit_failed(unit, "fsouh_4", req);
1858                 /* fall through */
1859         case FSF_INVALID_COMMAND_OPTION:
1860                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1861                 break;
1862         case FSF_ADAPTER_STATUS_AVAILABLE:
1863                 switch (header->fsf_status_qual.word[0]) {
1864                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1865                         zfcp_test_link(unit->port);
1866                         /* fall through */
1867                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1868                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1869                         break;
1870                 }
1871                 break;
1872
1873         case FSF_GOOD:
1874                 unit->handle = header->lun_handle;
1875                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1876
1877                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1878                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1879                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
1880                         exclusive = (bottom->lun_access_info &
1881                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1882                         readwrite = (bottom->lun_access_info &
1883                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1884
1885                         if (!exclusive)
1886                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1887                                                 &unit->status);
1888
1889                         if (!readwrite) {
1890                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1891                                                 &unit->status);
1892                                 dev_info(&adapter->ccw_device->dev,
1893                                          "SCSI device at LUN 0x%016Lx on port "
1894                                          "0x%016Lx opened read-only\n",
1895                                          (unsigned long long)unit->fcp_lun,
1896                                          (unsigned long long)unit->port->wwpn);
1897                         }
1898
1899                         if (exclusive && !readwrite) {
1900                                 dev_err(&adapter->ccw_device->dev,
1901                                         "Exclusive read-only access not "
1902                                         "supported (unit 0x%016Lx, "
1903                                         "port 0x%016Lx)\n",
1904                                         (unsigned long long)unit->fcp_lun,
1905                                         (unsigned long long)unit->port->wwpn);
1906                                 zfcp_erp_unit_failed(unit, "fsouh_5", req);
1907                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1908                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_6", req);
1909                         } else if (!exclusive && readwrite) {
1910                                 dev_err(&adapter->ccw_device->dev,
1911                                         "Shared read-write access not "
1912                                         "supported (unit 0x%016Lx, port "
1913                                         "0x%016Lx)\n",
1914                                         (unsigned long long)unit->fcp_lun,
1915                                         (unsigned long long)unit->port->wwpn);
1916                                 zfcp_erp_unit_failed(unit, "fsouh_7", req);
1917                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1918                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_8", req);
1919                         }
1920                 }
1921                 break;
1922         }
1923 }
1924
1925 /**
1926  * zfcp_fsf_open_unit - open unit
1927  * @erp_action: pointer to struct zfcp_erp_action
1928  * Returns: 0 on success, error otherwise
1929  */
1930 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1931 {
1932         struct qdio_buffer_element *sbale;
1933         struct zfcp_adapter *adapter = erp_action->adapter;
1934         struct zfcp_fsf_req *req;
1935         int retval = -EIO;
1936
1937         spin_lock_bh(&adapter->req_q_lock);
1938         if (zfcp_fsf_req_sbal_get(adapter))
1939                 goto out;
1940
1941         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
1942                                   ZFCP_REQ_AUTO_CLEANUP,
1943                                   adapter->pool.fsf_req_erp);
1944         if (IS_ERR(req)) {
1945                 retval = PTR_ERR(req);
1946                 goto out;
1947         }
1948
1949         sbale = zfcp_qdio_sbale_req(req);
1950         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1951         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1952
1953         req->qtcb->header.port_handle = erp_action->port->handle;
1954         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1955         req->handler = zfcp_fsf_open_unit_handler;
1956         req->data = erp_action->unit;
1957         req->erp_action = erp_action;
1958         erp_action->fsf_req = req;
1959
1960         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1961                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1962
1963         zfcp_fsf_start_erp_timer(req);
1964         retval = zfcp_fsf_req_send(req);
1965         if (retval) {
1966                 zfcp_fsf_req_free(req);
1967                 erp_action->fsf_req = NULL;
1968         }
1969 out:
1970         spin_unlock_bh(&adapter->req_q_lock);
1971         return retval;
1972 }
1973
1974 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
1975 {
1976         struct zfcp_unit *unit = req->data;
1977
1978         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1979                 return;
1980
1981         switch (req->qtcb->header.fsf_status) {
1982         case FSF_PORT_HANDLE_NOT_VALID:
1983                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fscuh_1", req);
1984                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1985                 break;
1986         case FSF_LUN_HANDLE_NOT_VALID:
1987                 zfcp_erp_port_reopen(unit->port, 0, "fscuh_2", req);
1988                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1989                 break;
1990         case FSF_PORT_BOXED:
1991                 zfcp_erp_port_boxed(unit->port, "fscuh_3", req);
1992                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1993                                ZFCP_STATUS_FSFREQ_RETRY;
1994                 break;
1995         case FSF_ADAPTER_STATUS_AVAILABLE:
1996                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
1997                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1998                         zfcp_test_link(unit->port);
1999                         /* fall through */
2000                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2001                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2002                         break;
2003                 }
2004                 break;
2005         case FSF_GOOD:
2006                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2007                 break;
2008         }
2009 }
2010
2011 /**
2012  * zfcp_fsf_close_unit - close zfcp unit
2013  * @erp_action: pointer to struct zfcp_unit
2014  * Returns: 0 on success, error otherwise
2015  */
2016 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2017 {
2018         struct qdio_buffer_element *sbale;
2019         struct zfcp_adapter *adapter = erp_action->adapter;
2020         struct zfcp_fsf_req *req;
2021         int retval = -EIO;
2022
2023         spin_lock_bh(&adapter->req_q_lock);
2024         if (zfcp_fsf_req_sbal_get(adapter))
2025                 goto out;
2026         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
2027                                   ZFCP_REQ_AUTO_CLEANUP,
2028                                   adapter->pool.fsf_req_erp);
2029         if (IS_ERR(req)) {
2030                 retval = PTR_ERR(req);
2031                 goto out;
2032         }
2033
2034         sbale = zfcp_qdio_sbale_req(req);
2035         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2036         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2037
2038         req->qtcb->header.port_handle = erp_action->port->handle;
2039         req->qtcb->header.lun_handle = erp_action->unit->handle;
2040         req->handler = zfcp_fsf_close_unit_handler;
2041         req->data = erp_action->unit;
2042         req->erp_action = erp_action;
2043         erp_action->fsf_req = req;
2044
2045         zfcp_fsf_start_erp_timer(req);
2046         retval = zfcp_fsf_req_send(req);
2047         if (retval) {
2048                 zfcp_fsf_req_free(req);
2049                 erp_action->fsf_req = NULL;
2050         }
2051 out:
2052         spin_unlock_bh(&adapter->req_q_lock);
2053         return retval;
2054 }
2055
2056 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2057 {
2058         lat_rec->sum += lat;
2059         lat_rec->min = min(lat_rec->min, lat);
2060         lat_rec->max = max(lat_rec->max, lat);
2061 }
2062
2063 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2064 {
2065         struct fsf_qual_latency_info *lat_inf;
2066         struct latency_cont *lat;
2067         struct zfcp_unit *unit = req->unit;
2068
2069         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2070
2071         switch (req->qtcb->bottom.io.data_direction) {
2072         case FSF_DATADIR_READ:
2073                 lat = &unit->latencies.read;
2074                 break;
2075         case FSF_DATADIR_WRITE:
2076                 lat = &unit->latencies.write;
2077                 break;
2078         case FSF_DATADIR_CMND:
2079                 lat = &unit->latencies.cmd;
2080                 break;
2081         default:
2082                 return;
2083         }
2084
2085         spin_lock(&unit->latencies.lock);
2086         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2087         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2088         lat->counter++;
2089         spin_unlock(&unit->latencies.lock);
2090 }
2091
2092 #ifdef CONFIG_BLK_DEV_IO_TRACE
2093 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2094 {
2095         struct fsf_qual_latency_info *lat_inf;
2096         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2097         struct request *req = scsi_cmnd->request;
2098         struct zfcp_blk_drv_data trace;
2099         int ticks = fsf_req->adapter->timer_ticks;
2100
2101         trace.flags = 0;
2102         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2103         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2104                 trace.flags |= ZFCP_BLK_LAT_VALID;
2105                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2106                 trace.channel_lat = lat_inf->channel_lat * ticks;
2107                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2108         }
2109         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2110                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2111         trace.inb_usage = fsf_req->qdio_inb_usage;
2112         trace.outb_usage = fsf_req->qdio_outb_usage;
2113
2114         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2115 }
2116 #else
2117 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2118 {
2119 }
2120 #endif
2121
2122 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2123 {
2124         struct scsi_cmnd *scpnt;
2125         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2126             &(req->qtcb->bottom.io.fcp_rsp);
2127         u32 sns_len;
2128         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2129         unsigned long flags;
2130
2131         read_lock_irqsave(&req->adapter->abort_lock, flags);
2132
2133         scpnt = req->data;
2134         if (unlikely(!scpnt)) {
2135                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2136                 return;
2137         }
2138
2139         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2140                 set_host_byte(scpnt, DID_SOFT_ERROR);
2141                 goto skip_fsfstatus;
2142         }
2143
2144         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2145                 set_host_byte(scpnt, DID_ERROR);
2146                 goto skip_fsfstatus;
2147         }
2148
2149         set_msg_byte(scpnt, COMMAND_COMPLETE);
2150
2151         scpnt->result |= fcp_rsp_iu->scsi_status;
2152
2153         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2154                 zfcp_fsf_req_latency(req);
2155
2156         zfcp_fsf_trace_latency(req);
2157
2158         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2159                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2160                         set_host_byte(scpnt, DID_OK);
2161                 else {
2162                         set_host_byte(scpnt, DID_ERROR);
2163                         goto skip_fsfstatus;
2164                 }
2165         }
2166
2167         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2168                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2169                           fcp_rsp_iu->fcp_rsp_len;
2170                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2171                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2172
2173                 memcpy(scpnt->sense_buffer,
2174                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2175         }
2176
2177         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2178                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2179                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2180                     scpnt->underflow)
2181                         set_host_byte(scpnt, DID_ERROR);
2182         }
2183 skip_fsfstatus:
2184         if (scpnt->result != 0)
2185                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2186         else if (scpnt->retries > 0)
2187                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2188         else
2189                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2190
2191         scpnt->host_scribble = NULL;
2192         (scpnt->scsi_done) (scpnt);
2193         /*
2194          * We must hold this lock until scsi_done has been called.
2195          * Otherwise we may call scsi_done after abort regarding this
2196          * command has completed.
2197          * Note: scsi_done must not block!
2198          */
2199         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2200 }
2201
2202 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2203 {
2204         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2205             &(req->qtcb->bottom.io.fcp_rsp);
2206         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2207
2208         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2209              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2210                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2211 }
2212
2213
2214 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2215 {
2216         struct zfcp_unit *unit;
2217         struct fsf_qtcb_header *header = &req->qtcb->header;
2218
2219         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2220                 unit = req->data;
2221         else
2222                 unit = req->unit;
2223
2224         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2225                 goto skip_fsfstatus;
2226
2227         switch (header->fsf_status) {
2228         case FSF_HANDLE_MISMATCH:
2229         case FSF_PORT_HANDLE_NOT_VALID:
2230                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fssfch1", req);
2231                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2232                 break;
2233         case FSF_FCPLUN_NOT_VALID:
2234         case FSF_LUN_HANDLE_NOT_VALID:
2235                 zfcp_erp_port_reopen(unit->port, 0, "fssfch2", req);
2236                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2237                 break;
2238         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2239                 zfcp_fsf_class_not_supp(req);
2240                 break;
2241         case FSF_ACCESS_DENIED:
2242                 zfcp_fsf_access_denied_unit(req, unit);
2243                 break;
2244         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2245                 dev_err(&req->adapter->ccw_device->dev,
2246                         "Incorrect direction %d, unit 0x%016Lx on port "
2247                         "0x%016Lx closed\n",
2248                         req->qtcb->bottom.io.data_direction,
2249                         (unsigned long long)unit->fcp_lun,
2250                         (unsigned long long)unit->port->wwpn);
2251                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch3",
2252                                           req);
2253                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2254                 break;
2255         case FSF_CMND_LENGTH_NOT_VALID:
2256                 dev_err(&req->adapter->ccw_device->dev,
2257                         "Incorrect CDB length %d, unit 0x%016Lx on "
2258                         "port 0x%016Lx closed\n",
2259                         req->qtcb->bottom.io.fcp_cmnd_length,
2260                         (unsigned long long)unit->fcp_lun,
2261                         (unsigned long long)unit->port->wwpn);
2262                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch4",
2263                                           req);
2264                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2265                 break;
2266         case FSF_PORT_BOXED:
2267                 zfcp_erp_port_boxed(unit->port, "fssfch5", req);
2268                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2269                                ZFCP_STATUS_FSFREQ_RETRY;
2270                 break;
2271         case FSF_LUN_BOXED:
2272                 zfcp_erp_unit_boxed(unit, "fssfch6", req);
2273                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2274                                ZFCP_STATUS_FSFREQ_RETRY;
2275                 break;
2276         case FSF_ADAPTER_STATUS_AVAILABLE:
2277                 if (header->fsf_status_qual.word[0] ==
2278                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2279                         zfcp_test_link(unit->port);
2280                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2281                 break;
2282         }
2283 skip_fsfstatus:
2284         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2285                 zfcp_fsf_send_fcp_ctm_handler(req);
2286         else {
2287                 zfcp_fsf_send_fcp_command_task_handler(req);
2288                 req->unit = NULL;
2289                 zfcp_unit_put(unit);
2290         }
2291 }
2292
2293 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2294 {
2295         u32 *fcp_dl_ptr;
2296
2297         /*
2298          * fcp_dl_addr = start address of fcp_cmnd structure +
2299          * size of fixed part + size of dynamically sized add_dcp_cdb field
2300          * SEE FCP-2 documentation
2301          */
2302         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2303                         (fcp_cmd->add_fcp_cdb_length << 2));
2304         *fcp_dl_ptr = fcp_dl;
2305 }
2306
2307 /**
2308  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2309  * @unit: unit where command is sent to
2310  * @scsi_cmnd: scsi command to be sent
2311  */
2312 int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
2313                                    struct scsi_cmnd *scsi_cmnd)
2314 {
2315         struct zfcp_fsf_req *req;
2316         struct fcp_cmnd_iu *fcp_cmnd_iu;
2317         unsigned int sbtype = SBAL_FLAGS0_TYPE_READ;
2318         int real_bytes, retval = -EIO;
2319         struct zfcp_adapter *adapter = unit->port->adapter;
2320
2321         if (unlikely(!(atomic_read(&unit->status) &
2322                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2323                 return -EBUSY;
2324
2325         spin_lock(&adapter->req_q_lock);
2326         if (atomic_read(&adapter->req_q.count) <= 0) {
2327                 atomic_inc(&adapter->qdio_outb_full);
2328                 goto out;
2329         }
2330         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND,
2331                                   ZFCP_REQ_AUTO_CLEANUP,
2332                                   adapter->pool.fsf_req_scsi);
2333         if (IS_ERR(req)) {
2334                 retval = PTR_ERR(req);
2335                 goto out;
2336         }
2337
2338         zfcp_unit_get(unit);
2339         req->unit = unit;
2340         req->data = scsi_cmnd;
2341         req->handler = zfcp_fsf_send_fcp_command_handler;
2342         req->qtcb->header.lun_handle = unit->handle;
2343         req->qtcb->header.port_handle = unit->port->handle;
2344         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2345
2346         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2347
2348         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2349         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2350         /*
2351          * set depending on data direction:
2352          *      data direction bits in SBALE (SB Type)
2353          *      data direction bits in QTCB
2354          *      data direction bits in FCP_CMND IU
2355          */
2356         switch (scsi_cmnd->sc_data_direction) {
2357         case DMA_NONE:
2358                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2359                 break;
2360         case DMA_FROM_DEVICE:
2361                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2362                 fcp_cmnd_iu->rddata = 1;
2363                 break;
2364         case DMA_TO_DEVICE:
2365                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2366                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2367                 fcp_cmnd_iu->wddata = 1;
2368                 break;
2369         case DMA_BIDIRECTIONAL:
2370                 goto failed_scsi_cmnd;
2371         }
2372
2373         if (likely((scsi_cmnd->device->simple_tags) ||
2374                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2375                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2376                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2377         else
2378                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2379
2380         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2381                 fcp_cmnd_iu->add_fcp_cdb_length =
2382                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2383
2384         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2385
2386         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2387                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2388
2389         real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
2390                                              scsi_sglist(scsi_cmnd),
2391                                              FSF_MAX_SBALS_PER_REQ);
2392         if (unlikely(real_bytes < 0)) {
2393                 if (req->sbal_number >= FSF_MAX_SBALS_PER_REQ) {
2394                         dev_err(&adapter->ccw_device->dev,
2395                                 "Oversize data package, unit 0x%016Lx "
2396                                 "on port 0x%016Lx closed\n",
2397                                 (unsigned long long)unit->fcp_lun,
2398                                 (unsigned long long)unit->port->wwpn);
2399                         zfcp_erp_unit_shutdown(unit, 0, "fssfct1", req);
2400                         retval = -EINVAL;
2401                 }
2402                 goto failed_scsi_cmnd;
2403         }
2404
2405         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2406
2407         retval = zfcp_fsf_req_send(req);
2408         if (unlikely(retval))
2409                 goto failed_scsi_cmnd;
2410
2411         goto out;
2412
2413 failed_scsi_cmnd:
2414         zfcp_unit_put(unit);
2415         zfcp_fsf_req_free(req);
2416         scsi_cmnd->host_scribble = NULL;
2417 out:
2418         spin_unlock(&adapter->req_q_lock);
2419         return retval;
2420 }
2421
2422 /**
2423  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2424  * @unit: pointer to struct zfcp_unit
2425  * @tm_flags: unsigned byte for task management flags
2426  * Returns: on success pointer to struct fsf_req, NULL otherwise
2427  */
2428 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
2429 {
2430         struct qdio_buffer_element *sbale;
2431         struct zfcp_fsf_req *req = NULL;
2432         struct fcp_cmnd_iu *fcp_cmnd_iu;
2433         struct zfcp_adapter *adapter = unit->port->adapter;
2434
2435         if (unlikely(!(atomic_read(&unit->status) &
2436                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2437                 return NULL;
2438
2439         spin_lock_bh(&adapter->req_q_lock);
2440         if (zfcp_fsf_req_sbal_get(adapter))
2441                 goto out;
2442         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, 0,
2443                                   adapter->pool.fsf_req_scsi);
2444         if (IS_ERR(req)) {
2445                 req = NULL;
2446                 goto out;
2447         }
2448
2449         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2450         req->data = unit;
2451         req->handler = zfcp_fsf_send_fcp_command_handler;
2452         req->qtcb->header.lun_handle = unit->handle;
2453         req->qtcb->header.port_handle = unit->port->handle;
2454         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2455         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2456         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2457                                                 sizeof(u32);
2458
2459         sbale = zfcp_qdio_sbale_req(req);
2460         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2461         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2462
2463         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2464         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2465         fcp_cmnd_iu->task_management_flags = tm_flags;
2466
2467         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2468         if (!zfcp_fsf_req_send(req))
2469                 goto out;
2470
2471         zfcp_fsf_req_free(req);
2472         req = NULL;
2473 out:
2474         spin_unlock_bh(&adapter->req_q_lock);
2475         return req;
2476 }
2477
2478 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2479 {
2480 }
2481
2482 /**
2483  * zfcp_fsf_control_file - control file upload/download
2484  * @adapter: pointer to struct zfcp_adapter
2485  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2486  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2487  */
2488 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2489                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2490 {
2491         struct qdio_buffer_element *sbale;
2492         struct zfcp_fsf_req *req = NULL;
2493         struct fsf_qtcb_bottom_support *bottom;
2494         int direction, retval = -EIO, bytes;
2495
2496         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2497                 return ERR_PTR(-EOPNOTSUPP);
2498
2499         switch (fsf_cfdc->command) {
2500         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2501                 direction = SBAL_FLAGS0_TYPE_WRITE;
2502                 break;
2503         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2504                 direction = SBAL_FLAGS0_TYPE_READ;
2505                 break;
2506         default:
2507                 return ERR_PTR(-EINVAL);
2508         }
2509
2510         spin_lock_bh(&adapter->req_q_lock);
2511         if (zfcp_fsf_req_sbal_get(adapter))
2512                 goto out;
2513
2514         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
2515         if (IS_ERR(req)) {
2516                 retval = -EPERM;
2517                 goto out;
2518         }
2519
2520         req->handler = zfcp_fsf_control_file_handler;
2521
2522         sbale = zfcp_qdio_sbale_req(req);
2523         sbale[0].flags |= direction;
2524
2525         bottom = &req->qtcb->bottom.support;
2526         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2527         bottom->option = fsf_cfdc->option;
2528
2529         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
2530                                         FSF_MAX_SBALS_PER_REQ);
2531         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2532                 retval = -ENOMEM;
2533                 zfcp_fsf_req_free(req);
2534                 goto out;
2535         }
2536
2537         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2538         retval = zfcp_fsf_req_send(req);
2539 out:
2540         spin_unlock_bh(&adapter->req_q_lock);
2541
2542         if (!retval) {
2543                 wait_event(req->completion_wq,
2544                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2545                 return req;
2546         }
2547         return ERR_PTR(retval);
2548 }