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 #include "zfcp_dbf.h"
  15
  16 static void zfcp_fsf_request_timeout_handler(unsigned long data)
  17 {
  18         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
  19         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
  20                                 "fsrth_1", NULL);
  21 }
  22
  23 static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
  24                                  unsigned long timeout)
  25 {
  26         fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
  27         fsf_req->timer.data = (unsigned long) fsf_req->adapter;
  28         fsf_req->timer.expires = jiffies + timeout;
  29         add_timer(&fsf_req->timer);
  30 }
  31
  32 static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
  33 {
  34         BUG_ON(!fsf_req->erp_action);
  35         fsf_req->timer.function = zfcp_erp_timeout_handler;
  36         fsf_req->timer.data = (unsigned long) fsf_req->erp_action;
  37         fsf_req->timer.expires = jiffies + 30 * HZ;
  38         add_timer(&fsf_req->timer);
  39 }
  40
  41 /* association between FSF command and FSF QTCB type */
  42 static u32 fsf_qtcb_type[] = {
  43         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  44         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  45         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  46         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  47         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  48         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  49         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  50         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  51         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  52         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  53         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  54         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  55         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  56 };
  57
  58 static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
  59 {
  60         u16 subtable = table >> 16;
  61         u16 rule = table & 0xffff;
  62         const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };
  63
  64         if (subtable && subtable < ARRAY_SIZE(act_type))
  65                 dev_warn(&adapter->ccw_device->dev,
  66                          "Access denied according to ACT rule type %s, "
  67                          "rule %d\n", act_type[subtable], rule);
  68 }
  69
  70 static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
  71                                         struct zfcp_port *port)
  72 {
  73         struct fsf_qtcb_header *header = &req->qtcb->header;
  74         dev_warn(&req->adapter->ccw_device->dev,
  75                  "Access denied to port 0x%016Lx\n",
  76                  (unsigned long long)port->wwpn);
  77         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  78         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  79         zfcp_erp_port_access_denied(port, "fspad_1", req);
  80         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  81 }
  82
  83 static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
  84                                         struct zfcp_unit *unit)
  85 {
  86         struct fsf_qtcb_header *header = &req->qtcb->header;
  87         dev_warn(&req->adapter->ccw_device->dev,
  88                  "Access denied to unit 0x%016Lx on port 0x%016Lx\n",
  89                  (unsigned long long)unit->fcp_lun,
  90                  (unsigned long long)unit->port->wwpn);
  91         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
  92         zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
  93         zfcp_erp_unit_access_denied(unit, "fsuad_1", req);
  94         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  95 }
  96
  97 static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
  98 {
  99         dev_err(&req->adapter->ccw_device->dev, "FCP device not "
 100                 "operational because of an unsupported FC class\n");
 101         zfcp_erp_adapter_shutdown(req->adapter, 0, "fscns_1", req);
 102         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 103 }
 104
 105 /**
 106  * zfcp_fsf_req_free - free memory used by fsf request
 107  * @fsf_req: pointer to struct zfcp_fsf_req
 108  */
 109 void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
 110 {
 111         if (likely(req->pool)) {
 112                 if (likely(req->qtcb))
 113                         mempool_free(req->qtcb, req->adapter->pool.qtcb_pool);
 114                 mempool_free(req, req->pool);
 115                 return;
 116         }
 117
 118         if (likely(req->qtcb))
 119                 kmem_cache_free(zfcp_data.qtcb_cache, req->qtcb);
 120         kfree(req);
 121 }
 122
 123 static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
 124 {
 125         struct fsf_status_read_buffer *sr_buf = req->data;
 126         struct zfcp_adapter *adapter = req->adapter;
 127         struct zfcp_port *port;
 128         int d_id = sr_buf->d_id & ZFCP_DID_MASK;
 129         unsigned long flags;
 130
 131         read_lock_irqsave(&zfcp_data.config_lock, flags);
 132         list_for_each_entry(port, &adapter->port_list_head, list)
 133                 if (port->d_id == d_id) {
 134                         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 135                         zfcp_erp_port_reopen(port, 0, "fssrpc1", req);
 136                         return;
 137                 }
 138         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 139 }
 140
 141 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, char *id,
 142                                          struct fsf_link_down_info *link_down)
 143 {
 144         struct zfcp_adapter *adapter = req->adapter;
 145         unsigned long flags;
 146
 147         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 148                 return;
 149
 150         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 151
 152         read_lock_irqsave(&zfcp_data.config_lock, flags);
 153         zfcp_scsi_schedule_rports_block(adapter);
 154         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 155
 156         if (!link_down)
 157                 goto out;
 158
 159         switch (link_down->error_code) {
 160         case FSF_PSQ_LINK_NO_LIGHT:
 161                 dev_warn(&req->adapter->ccw_device->dev,
 162                          "There is no light signal from the local "
 163                          "fibre channel cable\n");
 164                 break;
 165         case FSF_PSQ_LINK_WRAP_PLUG:
 166                 dev_warn(&req->adapter->ccw_device->dev,
 167                          "There is a wrap plug instead of a fibre "
 168                          "channel cable\n");
 169                 break;
 170         case FSF_PSQ_LINK_NO_FCP:
 171                 dev_warn(&req->adapter->ccw_device->dev,
 172                          "The adjacent fibre channel node does not "
 173                          "support FCP\n");
 174                 break;
 175         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 176                 dev_warn(&req->adapter->ccw_device->dev,
 177                          "The FCP device is suspended because of a "
 178                          "firmware update\n");
 179                 break;
 180         case FSF_PSQ_LINK_INVALID_WWPN:
 181                 dev_warn(&req->adapter->ccw_device->dev,
 182                          "The FCP device detected a WWPN that is "
 183                          "duplicate or not valid\n");
 184                 break;
 185         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 186                 dev_warn(&req->adapter->ccw_device->dev,
 187                          "The fibre channel fabric does not support NPIV\n");
 188                 break;
 189         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 190                 dev_warn(&req->adapter->ccw_device->dev,
 191                          "The FCP adapter cannot support more NPIV ports\n");
 192                 break;
 193         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 194                 dev_warn(&req->adapter->ccw_device->dev,
 195                          "The adjacent switch cannot support "
 196                          "more NPIV ports\n");
 197                 break;
 198         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 199                 dev_warn(&req->adapter->ccw_device->dev,
 200                          "The FCP adapter could not log in to the "
 201                          "fibre channel fabric\n");
 202                 break;
 203         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 204                 dev_warn(&req->adapter->ccw_device->dev,
 205                          "The WWPN assignment file on the FCP adapter "
 206                          "has been damaged\n");
 207                 break;
 208         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 209                 dev_warn(&req->adapter->ccw_device->dev,
 210                          "The mode table on the FCP adapter "
 211                          "has been damaged\n");
 212                 break;
 213         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 214                 dev_warn(&req->adapter->ccw_device->dev,
 215                          "All NPIV ports on the FCP adapter have "
 216                          "been assigned\n");
 217                 break;
 218         default:
 219                 dev_warn(&req->adapter->ccw_device->dev,
 220                          "The link between the FCP adapter and "
 221                          "the FC fabric is down\n");
 222         }
 223 out:
 224         zfcp_erp_adapter_failed(adapter, id, req);
 225 }
 226
 227 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 228 {
 229         struct fsf_status_read_buffer *sr_buf = req->data;
 230         struct fsf_link_down_info *ldi =
 231                 (struct fsf_link_down_info *) &sr_buf->payload;
 232
 233         switch (sr_buf->status_subtype) {
 234         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 235                 zfcp_fsf_link_down_info_eval(req, "fssrld1", ldi);
 236                 break;
 237         case FSF_STATUS_READ_SUB_FDISC_FAILED:
 238                 zfcp_fsf_link_down_info_eval(req, "fssrld2", ldi);
 239                 break;
 240         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 241                 zfcp_fsf_link_down_info_eval(req, "fssrld3", NULL);
 242         };
 243 }
 244
 245 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 246 {
 247         struct zfcp_adapter *adapter = req->adapter;
 248         struct fsf_status_read_buffer *sr_buf = req->data;
 249
 250         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 251                 zfcp_dbf_hba_fsf_unsol("dism", adapter->dbf, sr_buf);
 252                 mempool_free(sr_buf, adapter->pool.status_read_data);
 253                 zfcp_fsf_req_free(req);
 254                 return;
 255         }
 256
 257         zfcp_dbf_hba_fsf_unsol("read", adapter->dbf, sr_buf);
 258
 259         switch (sr_buf->status_type) {
 260         case FSF_STATUS_READ_PORT_CLOSED:
 261                 zfcp_fsf_status_read_port_closed(req);
 262                 break;
 263         case FSF_STATUS_READ_INCOMING_ELS:
 264                 zfcp_fc_incoming_els(req);
 265                 break;
 266         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 267                 break;
 268         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 269                 dev_warn(&adapter->ccw_device->dev,
 270                          "The error threshold for checksum statistics "
 271                          "has been exceeded\n");
 272                 zfcp_dbf_hba_berr(adapter->dbf, req);
 273                 break;
 274         case FSF_STATUS_READ_LINK_DOWN:
 275                 zfcp_fsf_status_read_link_down(req);
 276                 break;
 277         case FSF_STATUS_READ_LINK_UP:
 278                 dev_info(&adapter->ccw_device->dev,
 279                          "The local link has been restored\n");
 280                 /* All ports should be marked as ready to run again */
 281                 zfcp_erp_modify_adapter_status(adapter, "fssrh_1", NULL,
 282                                                ZFCP_STATUS_COMMON_RUNNING,
 283                                                ZFCP_SET);
 284                 zfcp_erp_adapter_reopen(adapter,
 285                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 286                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 287                                         "fssrh_2", req);
 288                 break;
 289         case FSF_STATUS_READ_NOTIFICATION_LOST:
 290                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
 291                         zfcp_erp_adapter_access_changed(adapter, "fssrh_3",
 292                                                         req);
 293                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
 294                         schedule_work(&adapter->scan_work);
 295                 break;
 296         case FSF_STATUS_READ_CFDC_UPDATED:
 297                 zfcp_erp_adapter_access_changed(adapter, "fssrh_4", req);
 298                 break;
 299         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 300                 adapter->adapter_features = sr_buf->payload.word[0];
 301                 break;
 302         }
 303
 304         mempool_free(sr_buf, adapter->pool.status_read_data);
 305         zfcp_fsf_req_free(req);
 306
 307         atomic_inc(&adapter->stat_miss);
 308         queue_work(adapter->work_queue, &adapter->stat_work);
 309 }
 310
 311 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 312 {
 313         switch (req->qtcb->header.fsf_status_qual.word[0]) {
 314         case FSF_SQ_FCP_RSP_AVAILABLE:
 315         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 316         case FSF_SQ_NO_RETRY_POSSIBLE:
 317         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 318                 return;
 319         case FSF_SQ_COMMAND_ABORTED:
 320                 req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 321                 break;
 322         case FSF_SQ_NO_RECOM:
 323                 dev_err(&req->adapter->ccw_device->dev,
 324                         "The FCP adapter reported a problem "
 325                         "that cannot be recovered\n");
 326                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfsqe1", req);
 327                 break;
 328         }
 329         /* all non-return stats set FSFREQ_ERROR*/
 330         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 331 }
 332
 333 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 334 {
 335         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 336                 return;
 337
 338         switch (req->qtcb->header.fsf_status) {
 339         case FSF_UNKNOWN_COMMAND:
 340                 dev_err(&req->adapter->ccw_device->dev,
 341                         "The FCP adapter does not recognize the command 0x%x\n",
 342                         req->qtcb->header.fsf_command);
 343                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfse_1", req);
 344                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 345                 break;
 346         case FSF_ADAPTER_STATUS_AVAILABLE:
 347                 zfcp_fsf_fsfstatus_qual_eval(req);
 348                 break;
 349         }
 350 }
 351
 352 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 353 {
 354         struct zfcp_adapter *adapter = req->adapter;
 355         struct fsf_qtcb *qtcb = req->qtcb;
 356         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 357
 358         zfcp_dbf_hba_fsf_response(req);
 359
 360         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 361                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 362                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 363                 return;
 364         }
 365
 366         switch (qtcb->prefix.prot_status) {
 367         case FSF_PROT_GOOD:
 368         case FSF_PROT_FSF_STATUS_PRESENTED:
 369                 return;
 370         case FSF_PROT_QTCB_VERSION_ERROR:
 371                 dev_err(&adapter->ccw_device->dev,
 372                         "QTCB version 0x%x not supported by FCP adapter "
 373                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
 374                         psq->word[0], psq->word[1]);
 375                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_1", req);
 376                 break;
 377         case FSF_PROT_ERROR_STATE:
 378         case FSF_PROT_SEQ_NUMB_ERROR:
 379                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_2", req);
 380                 req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 381                 break;
 382         case FSF_PROT_UNSUPP_QTCB_TYPE:
 383                 dev_err(&adapter->ccw_device->dev,
 384                         "The QTCB type is not supported by the FCP adapter\n");
 385                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_3", req);
 386                 break;
 387         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 388                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 389                                 &adapter->status);
 390                 break;
 391         case FSF_PROT_DUPLICATE_REQUEST_ID:
 392                 dev_err(&adapter->ccw_device->dev,
 393                         "0x%Lx is an ambiguous request identifier\n",
 394                         (unsigned long long)qtcb->bottom.support.req_handle);
 395                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_4", req);
 396                 break;
 397         case FSF_PROT_LINK_DOWN:
 398                 zfcp_fsf_link_down_info_eval(req, "fspse_5",
 399                                              &psq->link_down_info);
 400                 /* FIXME: reopening adapter now? better wait for link up */
 401                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_6", req);
 402                 break;
 403         case FSF_PROT_REEST_QUEUE:
 404                 /* All ports should be marked as ready to run again */
 405                 zfcp_erp_modify_adapter_status(adapter, "fspse_7", NULL,
 406                                                ZFCP_STATUS_COMMON_RUNNING,
 407                                                ZFCP_SET);
 408                 zfcp_erp_adapter_reopen(adapter,
 409                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 410                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 411                                         "fspse_8", req);
 412                 break;
 413         default:
 414                 dev_err(&adapter->ccw_device->dev,
 415                         "0x%x is not a valid transfer protocol status\n",
 416                         qtcb->prefix.prot_status);
 417                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_9", req);
 418         }
 419         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 420 }
 421
 422 /**
 423  * zfcp_fsf_req_complete - process completion of a FSF request
 424  * @fsf_req: The FSF request that has been completed.
 425  *
 426  * When a request has been completed either from the FCP adapter,
 427  * or it has been dismissed due to a queue shutdown, this function
 428  * is called to process the completion status and trigger further
 429  * events related to the FSF request.
 430  */
 431 static void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 432 {
 433         if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 434                 zfcp_fsf_status_read_handler(req);
 435                 return;
 436         }
 437
 438         del_timer(&req->timer);
 439         zfcp_fsf_protstatus_eval(req);
 440         zfcp_fsf_fsfstatus_eval(req);
 441         req->handler(req);
 442
 443         if (req->erp_action)
 444                 zfcp_erp_notify(req->erp_action, 0);
 445
 446         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 447                 zfcp_fsf_req_free(req);
 448         else
 449                 complete(&req->completion);
 450 }
 451
 452 /**
 453  * zfcp_fsf_req_dismiss_all - dismiss all fsf requests
 454  * @adapter: pointer to struct zfcp_adapter
 455  *
 456  * Never ever call this without shutting down the adapter first.
 457  * Otherwise the adapter would continue using and corrupting s390 storage.
 458  * Included BUG_ON() call to ensure this is done.
 459  * ERP is supposed to be the only user of this function.
 460  */
 461 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 462 {
 463         struct zfcp_fsf_req *req, *tmp;
 464         unsigned long flags;
 465         LIST_HEAD(remove_queue);
 466         unsigned int i;
 467
 468         BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
 469         spin_lock_irqsave(&adapter->req_list_lock, flags);
 470         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 471                 list_splice_init(&adapter->req_list[i], &remove_queue);
 472         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 473
 474         list_for_each_entry_safe(req, tmp, &remove_queue, list) {
 475                 list_del(&req->list);
 476                 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 477                 zfcp_fsf_req_complete(req);
 478         }
 479 }
 480
 481 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 482 {
 483         struct fsf_qtcb_bottom_config *bottom;
 484         struct zfcp_adapter *adapter = req->adapter;
 485         struct Scsi_Host *shost = adapter->scsi_host;
 486
 487         bottom = &req->qtcb->bottom.config;
 488
 489         if (req->data)
 490                 memcpy(req->data, bottom, sizeof(*bottom));
 491
 492         fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
 493         fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
 494         fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
 495         fc_host_speed(shost) = bottom->fc_link_speed;
 496         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 497
 498         adapter->hydra_version = bottom->adapter_type;
 499         adapter->timer_ticks = bottom->timer_interval;
 500
 501         if (fc_host_permanent_port_name(shost) == -1)
 502                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 503
 504         switch (bottom->fc_topology) {
 505         case FSF_TOPO_P2P:
 506                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
 507                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
 508                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
 509                 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
 510                 break;
 511         case FSF_TOPO_FABRIC:
 512                 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
 513                 break;
 514         case FSF_TOPO_AL:
 515                 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
 516                 /* fall through */
 517         default:
 518                 dev_err(&adapter->ccw_device->dev,
 519                         "Unknown or unsupported arbitrated loop "
 520                         "fibre channel topology detected\n");
 521                 zfcp_erp_adapter_shutdown(adapter, 0, "fsece_1", req);
 522                 return -EIO;
 523         }
 524
 525         return 0;
 526 }
 527
 528 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 529 {
 530         struct zfcp_adapter *adapter = req->adapter;
 531         struct fsf_qtcb *qtcb = req->qtcb;
 532         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 533         struct Scsi_Host *shost = adapter->scsi_host;
 534
 535         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 536                 return;
 537
 538         adapter->fsf_lic_version = bottom->lic_version;
 539         adapter->adapter_features = bottom->adapter_features;
 540         adapter->connection_features = bottom->connection_features;
 541         adapter->peer_wwpn = 0;
 542         adapter->peer_wwnn = 0;
 543         adapter->peer_d_id = 0;
 544
 545         switch (qtcb->header.fsf_status) {
 546         case FSF_GOOD:
 547                 if (zfcp_fsf_exchange_config_evaluate(req))
 548                         return;
 549
 550                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 551                         dev_err(&adapter->ccw_device->dev,
 552                                 "FCP adapter maximum QTCB size (%d bytes) "
 553                                 "is too small\n",
 554                                 bottom->max_qtcb_size);
 555                         zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh1", req);
 556                         return;
 557                 }
 558                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 559                                 &adapter->status);
 560                 break;
 561         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 562                 fc_host_node_name(shost) = 0;
 563                 fc_host_port_name(shost) = 0;
 564                 fc_host_port_id(shost) = 0;
 565                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 566                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 567                 adapter->hydra_version = 0;
 568
 569                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 570                                 &adapter->status);
 571
 572                 zfcp_fsf_link_down_info_eval(req, "fsecdh2",
 573                         &qtcb->header.fsf_status_qual.link_down_info);
 574                 break;
 575         default:
 576                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh3", req);
 577                 return;
 578         }
 579
 580         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 581                 adapter->hardware_version = bottom->hardware_version;
 582                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
 583                        min(FC_SERIAL_NUMBER_SIZE, 17));
 584                 EBCASC(fc_host_serial_number(shost),
 585                        min(FC_SERIAL_NUMBER_SIZE, 17));
 586         }
 587
 588         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 589                 dev_err(&adapter->ccw_device->dev,
 590                         "The FCP adapter only supports newer "
 591                         "control block versions\n");
 592                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh4", req);
 593                 return;
 594         }
 595         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 596                 dev_err(&adapter->ccw_device->dev,
 597                         "The FCP adapter only supports older "
 598                         "control block versions\n");
 599                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh5", req);
 600         }
 601 }
 602
 603 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 604 {
 605         struct zfcp_adapter *adapter = req->adapter;
 606         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 607         struct Scsi_Host *shost = adapter->scsi_host;
 608
 609         if (req->data)
 610                 memcpy(req->data, bottom, sizeof(*bottom));
 611
 612         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) {
 613                 fc_host_permanent_port_name(shost) = bottom->wwpn;
 614                 fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
 615         } else
 616                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 617         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 618         fc_host_supported_speeds(shost) = bottom->supported_speed;
 619 }
 620
 621 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 622 {
 623         struct fsf_qtcb *qtcb = req->qtcb;
 624
 625         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 626                 return;
 627
 628         switch (qtcb->header.fsf_status) {
 629         case FSF_GOOD:
 630                 zfcp_fsf_exchange_port_evaluate(req);
 631                 break;
 632         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 633                 zfcp_fsf_exchange_port_evaluate(req);
 634                 zfcp_fsf_link_down_info_eval(req, "fsepdh1",
 635                         &qtcb->header.fsf_status_qual.link_down_info);
 636                 break;
 637         }
 638 }
 639
 640 static int zfcp_fsf_sbal_check(struct zfcp_qdio *qdio)
 641 {
 642         struct zfcp_qdio_queue *req_q = &qdio->req_q;
 643
 644         spin_lock_bh(&qdio->req_q_lock);
 645         if (atomic_read(&req_q->count))
 646                 return 1;
 647         spin_unlock_bh(&qdio->req_q_lock);
 648         return 0;
 649 }
 650
 651 static int zfcp_fsf_req_sbal_get(struct zfcp_qdio *qdio)
 652 {
 653         struct zfcp_adapter *adapter = qdio->adapter;
 654         long ret;
 655
 656         spin_unlock_bh(&qdio->req_q_lock);
 657         ret = wait_event_interruptible_timeout(qdio->req_q_wq,
 658                                zfcp_fsf_sbal_check(qdio), 5 * HZ);
 659         if (ret > 0)
 660                 return 0;
 661         if (!ret) {
 662                 atomic_inc(&qdio->req_q_full);
 663                 /* assume hanging outbound queue, try queue recovery */
 664                 zfcp_erp_adapter_reopen(adapter, 0, "fsrsg_1", NULL);
 665         }
 666
 667         spin_lock_bh(&qdio->req_q_lock);
 668         return -EIO;
 669 }
 670
 671 static struct zfcp_fsf_req *zfcp_fsf_alloc(mempool_t *pool)
 672 {
 673         struct zfcp_fsf_req *req;
 674
 675         if (likely(pool))
 676                 req = mempool_alloc(pool, GFP_ATOMIC);
 677         else
 678                 req = kmalloc(sizeof(*req), GFP_ATOMIC);
 679
 680         if (unlikely(!req))
 681                 return NULL;
 682
 683         memset(req, 0, sizeof(*req));
 684         req->pool = pool;
 685         return req;
 686 }
 687
 688 static struct fsf_qtcb *zfcp_qtcb_alloc(mempool_t *pool)
 689 {
 690         struct fsf_qtcb *qtcb;
 691
 692         if (likely(pool))
 693                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
 694         else
 695                 qtcb = kmem_cache_alloc(zfcp_data.qtcb_cache, GFP_ATOMIC);
 696
 697         if (unlikely(!qtcb))
 698                 return NULL;
 699
 700         memset(qtcb, 0, sizeof(*qtcb));
 701         return qtcb;
 702 }
 703
 704 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio,
 705                                                 u32 fsf_cmd, mempool_t *pool)
 706 {
 707         struct qdio_buffer_element *sbale;
 708         struct zfcp_qdio_queue *req_q = &qdio->req_q;
 709         struct zfcp_adapter *adapter = qdio->adapter;
 710         struct zfcp_fsf_req *req = zfcp_fsf_alloc(pool);
 711
 712         if (unlikely(!req))
 713                 return ERR_PTR(-ENOMEM);
 714
 715         if (adapter->req_no == 0)
 716                 adapter->req_no++;
 717
 718         INIT_LIST_HEAD(&req->list);
 719         init_timer(&req->timer);
 720         init_completion(&req->completion);
 721
 722         req->adapter = adapter;
 723         req->fsf_command = fsf_cmd;
 724         req->req_id = adapter->req_no;
 725         req->queue_req.sbal_number = 1;
 726         req->queue_req.sbal_first = req_q->first;
 727         req->queue_req.sbal_last = req_q->first;
 728         req->queue_req.sbale_curr = 1;
 729
 730         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
 731         sbale[0].addr = (void *) req->req_id;
 732         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 733
 734         if (likely(fsf_cmd != FSF_QTCB_UNSOLICITED_STATUS)) {
 735                 if (likely(pool))
 736                         req->qtcb = zfcp_qtcb_alloc(adapter->pool.qtcb_pool);
 737                 else
 738                         req->qtcb = zfcp_qtcb_alloc(NULL);
 739
 740                 if (unlikely(!req->qtcb)) {
 741                         zfcp_fsf_req_free(req);
 742                         return ERR_PTR(-ENOMEM);
 743                 }
 744
 745                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 746                 req->qtcb->prefix.req_id = req->req_id;
 747                 req->qtcb->prefix.ulp_info = 26;
 748                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command];
 749                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
 750                 req->qtcb->header.req_handle = req->req_id;
 751                 req->qtcb->header.fsf_command = req->fsf_command;
 752                 req->seq_no = adapter->fsf_req_seq_no;
 753                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 754                 sbale[1].addr = (void *) req->qtcb;
 755                 sbale[1].length = sizeof(struct fsf_qtcb);
 756         }
 757
 758         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) {
 759                 zfcp_fsf_req_free(req);
 760                 return ERR_PTR(-EIO);
 761         }
 762
 763         return req;
 764 }
 765
 766 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 767 {
 768         struct zfcp_adapter *adapter = req->adapter;
 769         struct zfcp_qdio *qdio = adapter->qdio;
 770         unsigned long        flags;
 771         int                  idx;
 772         int                  with_qtcb = (req->qtcb != NULL);
 773
 774         /* put allocated FSF request into hash table */
 775         spin_lock_irqsave(&adapter->req_list_lock, flags);
 776         idx = zfcp_reqlist_hash(req->req_id);
 777         list_add_tail(&req->list, &adapter->req_list[idx]);
 778         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 779
 780         req->queue_req.qdio_outb_usage = atomic_read(&qdio->req_q.count);
 781         req->issued = get_clock();
 782         if (zfcp_qdio_send(qdio, &req->queue_req)) {
 783                 del_timer(&req->timer);
 784                 spin_lock_irqsave(&adapter->req_list_lock, flags);
 785                 /* lookup request again, list might have changed */
 786                 if (zfcp_reqlist_find_safe(adapter, req))
 787                         zfcp_reqlist_remove(adapter, req);
 788                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 789                 zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1", req);
 790                 return -EIO;
 791         }
 792
 793         /* Don't increase for unsolicited status */
 794         if (with_qtcb)
 795                 adapter->fsf_req_seq_no++;
 796         adapter->req_no++;
 797
 798         return 0;
 799 }
 800
 801 /**
 802  * zfcp_fsf_status_read - send status read request
 803  * @adapter: pointer to struct zfcp_adapter
 804  * @req_flags: request flags
 805  * Returns: 0 on success, ERROR otherwise
 806  */
 807 int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
 808 {
 809         struct zfcp_adapter *adapter = qdio->adapter;
 810         struct zfcp_fsf_req *req;
 811         struct fsf_status_read_buffer *sr_buf;
 812         struct qdio_buffer_element *sbale;
 813         int retval = -EIO;
 814
 815         spin_lock_bh(&qdio->req_q_lock);
 816         if (zfcp_fsf_req_sbal_get(qdio))
 817                 goto out;
 818
 819         req = zfcp_fsf_req_create(qdio, FSF_QTCB_UNSOLICITED_STATUS,
 820                                   adapter->pool.status_read_req);
 821         if (IS_ERR(req)) {
 822                 retval = PTR_ERR(req);
 823                 goto out;
 824         }
 825
 826         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
 827         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 828         req->queue_req.sbale_curr = 2;
 829
 830         sr_buf = mempool_alloc(adapter->pool.status_read_data, GFP_ATOMIC);
 831         if (!sr_buf) {
 832                 retval = -ENOMEM;
 833                 goto failed_buf;
 834         }
 835         memset(sr_buf, 0, sizeof(*sr_buf));
 836         req->data = sr_buf;
 837         sbale = zfcp_qdio_sbale_curr(qdio, &req->queue_req);
 838         sbale->addr = (void *) sr_buf;
 839         sbale->length = sizeof(*sr_buf);
 840
 841         retval = zfcp_fsf_req_send(req);
 842         if (retval)
 843                 goto failed_req_send;
 844
 845         goto out;
 846
 847 failed_req_send:
 848         mempool_free(sr_buf, adapter->pool.status_read_data);
 849 failed_buf:
 850         zfcp_fsf_req_free(req);
 851         zfcp_dbf_hba_fsf_unsol("fail", adapter->dbf, NULL);
 852 out:
 853         spin_unlock_bh(&qdio->req_q_lock);
 854         return retval;
 855 }
 856
 857 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 858 {
 859         struct zfcp_unit *unit = req->data;
 860         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 861
 862         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 863                 return;
 864
 865         switch (req->qtcb->header.fsf_status) {
 866         case FSF_PORT_HANDLE_NOT_VALID:
 867                 if (fsq->word[0] == fsq->word[1]) {
 868                         zfcp_erp_adapter_reopen(unit->port->adapter, 0,
 869                                                 "fsafch1", req);
 870                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 871                 }
 872                 break;
 873         case FSF_LUN_HANDLE_NOT_VALID:
 874                 if (fsq->word[0] == fsq->word[1]) {
 875                         zfcp_erp_port_reopen(unit->port, 0, "fsafch2", req);
 876                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 877                 }
 878                 break;
 879         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 880                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 881                 break;
 882         case FSF_PORT_BOXED:
 883                 zfcp_erp_port_boxed(unit->port, "fsafch3", req);
 884                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 885                                ZFCP_STATUS_FSFREQ_RETRY;
 886                 break;
 887         case FSF_LUN_BOXED:
 888                 zfcp_erp_unit_boxed(unit, "fsafch4", req);
 889                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 890                                ZFCP_STATUS_FSFREQ_RETRY;
 891                 break;
 892         case FSF_ADAPTER_STATUS_AVAILABLE:
 893                 switch (fsq->word[0]) {
 894                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 895                         zfcp_fc_test_link(unit->port);
 896                         /* fall through */
 897                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 898                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 899                         break;
 900                 }
 901                 break;
 902         case FSF_GOOD:
 903                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 904                 break;
 905         }
 906 }
 907
 908 /**
 909  * zfcp_fsf_abort_fcp_command - abort running SCSI command
 910  * @old_req_id: unsigned long
 911  * @unit: pointer to struct zfcp_unit
 912  * Returns: pointer to struct zfcp_fsf_req
 913  */
 914
 915 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 916                                                 struct zfcp_unit *unit)
 917 {
 918         struct qdio_buffer_element *sbale;
 919         struct zfcp_fsf_req *req = NULL;
 920         struct zfcp_qdio *qdio = unit->port->adapter->qdio;
 921
 922         spin_lock_bh(&qdio->req_q_lock);
 923         if (zfcp_fsf_req_sbal_get(qdio))
 924                 goto out;
 925         req = zfcp_fsf_req_create(qdio, FSF_QTCB_ABORT_FCP_CMND,
 926                                   qdio->adapter->pool.scsi_abort);
 927         if (IS_ERR(req)) {
 928                 req = NULL;
 929                 goto out;
 930         }
 931
 932         if (unlikely(!(atomic_read(&unit->status) &
 933                        ZFCP_STATUS_COMMON_UNBLOCKED)))
 934                 goto out_error_free;
 935
 936         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
 937         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 938         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 939
 940         req->data = unit;
 941         req->handler = zfcp_fsf_abort_fcp_command_handler;
 942         req->qtcb->header.lun_handle = unit->handle;
 943         req->qtcb->header.port_handle = unit->port->handle;
 944         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 945
 946         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 947         if (!zfcp_fsf_req_send(req))
 948                 goto out;
 949
 950 out_error_free:
 951         zfcp_fsf_req_free(req);
 952         req = NULL;
 953 out:
 954         spin_unlock_bh(&qdio->req_q_lock);
 955         return req;
 956 }
 957
 958 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 959 {
 960         struct zfcp_adapter *adapter = req->adapter;
 961         struct zfcp_send_ct *send_ct = req->data;
 962         struct fsf_qtcb_header *header = &req->qtcb->header;
 963
 964         send_ct->status = -EINVAL;
 965
 966         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 967                 goto skip_fsfstatus;
 968
 969         switch (header->fsf_status) {
 970         case FSF_GOOD:
 971                 zfcp_dbf_san_ct_response(req);
 972                 send_ct->status = 0;
 973                 break;
 974         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 975                 zfcp_fsf_class_not_supp(req);
 976                 break;
 977         case FSF_ADAPTER_STATUS_AVAILABLE:
 978                 switch (header->fsf_status_qual.word[0]){
 979                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 980                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 981                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 982                         break;
 983                 }
 984                 break;
 985         case FSF_ACCESS_DENIED:
 986                 break;
 987         case FSF_PORT_BOXED:
 988                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 989                                ZFCP_STATUS_FSFREQ_RETRY;
 990                 break;
 991         case FSF_PORT_HANDLE_NOT_VALID:
 992                 zfcp_erp_adapter_reopen(adapter, 0, "fsscth1", req);
 993                 /* fall through */
 994         case FSF_GENERIC_COMMAND_REJECTED:
 995         case FSF_PAYLOAD_SIZE_MISMATCH:
 996         case FSF_REQUEST_SIZE_TOO_LARGE:
 997         case FSF_RESPONSE_SIZE_TOO_LARGE:
 998         case FSF_SBAL_MISMATCH:
 999                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1000                 break;
1001         }
1002
1003 skip_fsfstatus:
1004         if (send_ct->handler)
1005                 send_ct->handler(send_ct->handler_data);
1006 }
1007
1008 static void zfcp_fsf_setup_ct_els_unchained(struct qdio_buffer_element *sbale,
1009                                             struct scatterlist *sg_req,
1010                                             struct scatterlist *sg_resp)
1011 {
1012         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1013         sbale[2].addr   = sg_virt(sg_req);
1014         sbale[2].length = sg_req->length;
1015         sbale[3].addr   = sg_virt(sg_resp);
1016         sbale[3].length = sg_resp->length;
1017         sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1018 }
1019
1020 static int zfcp_fsf_one_sbal(struct scatterlist *sg)
1021 {
1022         return sg_is_last(sg) && sg->length <= PAGE_SIZE;
1023 }
1024
1025 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1026                                        struct scatterlist *sg_req,
1027                                        struct scatterlist *sg_resp,
1028                                        int max_sbals)
1029 {
1030         struct zfcp_adapter *adapter = req->adapter;
1031         struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(adapter->qdio,
1032                                                                &req->queue_req);
1033         u32 feat = adapter->adapter_features;
1034         int bytes;
1035
1036         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
1037                 if (!zfcp_fsf_one_sbal(sg_req) || !zfcp_fsf_one_sbal(sg_resp))
1038                         return -EOPNOTSUPP;
1039
1040                 zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
1041                 return 0;
1042         }
1043
1044         /* use single, unchained SBAL if it can hold the request */
1045         if (zfcp_fsf_one_sbal(sg_req) && zfcp_fsf_one_sbal(sg_resp)) {
1046                 zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
1047                 return 0;
1048         }
1049
1050         bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->queue_req,
1051                                         SBAL_FLAGS0_TYPE_WRITE_READ,
1052                                         sg_req, max_sbals);
1053         if (bytes <= 0)
1054                 return -EIO;
1055         req->qtcb->bottom.support.req_buf_length = bytes;
1056         req->queue_req.sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1057
1058         bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->queue_req,
1059                                         SBAL_FLAGS0_TYPE_WRITE_READ,
1060                                         sg_resp, max_sbals);
1061         if (bytes <= 0)
1062                 return -EIO;
1063
1064         /* common settings for ct/gs and els requests */
1065         req->qtcb->bottom.support.resp_buf_length = bytes;
1066         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1067         req->qtcb->bottom.support.timeout = 2 * R_A_TOV;
1068         zfcp_fsf_start_timer(req, 2 * R_A_TOV + 10);
1069
1070         return 0;
1071 }
1072
1073 /**
1074  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1075  * @ct: pointer to struct zfcp_send_ct with data for request
1076  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1077  */
1078 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool)
1079 {
1080         struct zfcp_wka_port *wka_port = ct->wka_port;
1081         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1082         struct zfcp_fsf_req *req;
1083         int ret = -EIO;
1084
1085         spin_lock_bh(&qdio->req_q_lock);
1086         if (zfcp_fsf_req_sbal_get(qdio))
1087                 goto out;
1088
1089         req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_GENERIC, pool);
1090
1091         if (IS_ERR(req)) {
1092                 ret = PTR_ERR(req);
1093                 goto out;
1094         }
1095
1096         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1097         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1098                                           FSF_MAX_SBALS_PER_REQ);
1099         if (ret)
1100                 goto failed_send;
1101
1102         req->handler = zfcp_fsf_send_ct_handler;
1103         req->qtcb->header.port_handle = wka_port->handle;
1104         req->data = ct;
1105
1106         zfcp_dbf_san_ct_request(req);
1107
1108         ret = zfcp_fsf_req_send(req);
1109         if (ret)
1110                 goto failed_send;
1111
1112         goto out;
1113
1114 failed_send:
1115         zfcp_fsf_req_free(req);
1116 out:
1117         spin_unlock_bh(&qdio->req_q_lock);
1118         return ret;
1119 }
1120
1121 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1122 {
1123         struct zfcp_send_els *send_els = req->data;
1124         struct zfcp_port *port = send_els->port;
1125         struct fsf_qtcb_header *header = &req->qtcb->header;
1126
1127         send_els->status = -EINVAL;
1128
1129         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1130                 goto skip_fsfstatus;
1131
1132         switch (header->fsf_status) {
1133         case FSF_GOOD:
1134                 zfcp_dbf_san_els_response(req);
1135                 send_els->status = 0;
1136                 break;
1137         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1138                 zfcp_fsf_class_not_supp(req);
1139                 break;
1140         case FSF_ADAPTER_STATUS_AVAILABLE:
1141                 switch (header->fsf_status_qual.word[0]){
1142                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1143                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1144                                 zfcp_fc_test_link(port);
1145                         /*fall through */
1146                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1147                 case FSF_SQ_RETRY_IF_POSSIBLE:
1148                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1149                         break;
1150                 }
1151                 break;
1152         case FSF_ELS_COMMAND_REJECTED:
1153         case FSF_PAYLOAD_SIZE_MISMATCH:
1154         case FSF_REQUEST_SIZE_TOO_LARGE:
1155         case FSF_RESPONSE_SIZE_TOO_LARGE:
1156                 break;
1157         case FSF_ACCESS_DENIED:
1158                 if (port)
1159                         zfcp_fsf_access_denied_port(req, port);
1160                 break;
1161         case FSF_SBAL_MISMATCH:
1162                 /* should never occure, avoided in zfcp_fsf_send_els */
1163                 /* fall through */
1164         default:
1165                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1166                 break;
1167         }
1168 skip_fsfstatus:
1169         if (send_els->handler)
1170                 send_els->handler(send_els->handler_data);
1171 }
1172
1173 /**
1174  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1175  * @els: pointer to struct zfcp_send_els with data for the command
1176  */
1177 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1178 {
1179         struct zfcp_fsf_req *req;
1180         struct zfcp_qdio *qdio = els->adapter->qdio;
1181         int ret = -EIO;
1182
1183         spin_lock_bh(&qdio->req_q_lock);
1184         if (zfcp_fsf_req_sbal_get(qdio))
1185                 goto out;
1186
1187         req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_ELS, NULL);
1188
1189         if (IS_ERR(req)) {
1190                 ret = PTR_ERR(req);
1191                 goto out;
1192         }
1193
1194         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1195         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1196
1197         if (ret)
1198                 goto failed_send;
1199
1200         req->qtcb->bottom.support.d_id = els->d_id;
1201         req->handler = zfcp_fsf_send_els_handler;
1202         req->data = els;
1203
1204         zfcp_dbf_san_els_request(req);
1205
1206         ret = zfcp_fsf_req_send(req);
1207         if (ret)
1208                 goto failed_send;
1209
1210         goto out;
1211
1212 failed_send:
1213         zfcp_fsf_req_free(req);
1214 out:
1215         spin_unlock_bh(&qdio->req_q_lock);
1216         return ret;
1217 }
1218
1219 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1220 {
1221         struct qdio_buffer_element *sbale;
1222         struct zfcp_fsf_req *req;
1223         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1224         int retval = -EIO;
1225
1226         spin_lock_bh(&qdio->req_q_lock);
1227         if (zfcp_fsf_req_sbal_get(qdio))
1228                 goto out;
1229
1230         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1231                                   qdio->adapter->pool.erp_req);
1232
1233         if (IS_ERR(req)) {
1234                 retval = PTR_ERR(req);
1235                 goto out;
1236         }
1237
1238         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1239         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1240         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1241         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1242
1243         req->qtcb->bottom.config.feature_selection =
1244                         FSF_FEATURE_CFDC |
1245                         FSF_FEATURE_LUN_SHARING |
1246                         FSF_FEATURE_NOTIFICATION_LOST |
1247                         FSF_FEATURE_UPDATE_ALERT;
1248         req->erp_action = erp_action;
1249         req->handler = zfcp_fsf_exchange_config_data_handler;
1250         erp_action->fsf_req = req;
1251
1252         zfcp_fsf_start_erp_timer(req);
1253         retval = zfcp_fsf_req_send(req);
1254         if (retval) {
1255                 zfcp_fsf_req_free(req);
1256                 erp_action->fsf_req = NULL;
1257         }
1258 out:
1259         spin_unlock_bh(&qdio->req_q_lock);
1260         return retval;
1261 }
1262
1263 int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
1264                                        struct fsf_qtcb_bottom_config *data)
1265 {
1266         struct qdio_buffer_element *sbale;
1267         struct zfcp_fsf_req *req = NULL;
1268         int retval = -EIO;
1269
1270         spin_lock_bh(&qdio->req_q_lock);
1271         if (zfcp_fsf_req_sbal_get(qdio))
1272                 goto out_unlock;
1273
1274         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA, NULL);
1275
1276         if (IS_ERR(req)) {
1277                 retval = PTR_ERR(req);
1278                 goto out_unlock;
1279         }
1280
1281         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1282         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1283         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1284         req->handler = zfcp_fsf_exchange_config_data_handler;
1285
1286         req->qtcb->bottom.config.feature_selection =
1287                         FSF_FEATURE_CFDC |
1288                         FSF_FEATURE_LUN_SHARING |
1289                         FSF_FEATURE_NOTIFICATION_LOST |
1290                         FSF_FEATURE_UPDATE_ALERT;
1291
1292         if (data)
1293                 req->data = data;
1294
1295         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1296         retval = zfcp_fsf_req_send(req);
1297         spin_unlock_bh(&qdio->req_q_lock);
1298         if (!retval)
1299                 wait_for_completion(&req->completion);
1300
1301         zfcp_fsf_req_free(req);
1302         return retval;
1303
1304 out_unlock:
1305         spin_unlock_bh(&qdio->req_q_lock);
1306         return retval;
1307 }
1308
1309 /**
1310  * zfcp_fsf_exchange_port_data - request information about local port
1311  * @erp_action: ERP action for the adapter for which port data is requested
1312  * Returns: 0 on success, error otherwise
1313  */
1314 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1315 {
1316         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1317         struct qdio_buffer_element *sbale;
1318         struct zfcp_fsf_req *req;
1319         int retval = -EIO;
1320
1321         if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1322                 return -EOPNOTSUPP;
1323
1324         spin_lock_bh(&qdio->req_q_lock);
1325         if (zfcp_fsf_req_sbal_get(qdio))
1326                 goto out;
1327
1328         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA,
1329                                   qdio->adapter->pool.erp_req);
1330
1331         if (IS_ERR(req)) {
1332                 retval = PTR_ERR(req);
1333                 goto out;
1334         }
1335
1336         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1337         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1338         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1339         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1340
1341         req->handler = zfcp_fsf_exchange_port_data_handler;
1342         req->erp_action = erp_action;
1343         erp_action->fsf_req = req;
1344
1345         zfcp_fsf_start_erp_timer(req);
1346         retval = zfcp_fsf_req_send(req);
1347         if (retval) {
1348                 zfcp_fsf_req_free(req);
1349                 erp_action->fsf_req = NULL;
1350         }
1351 out:
1352         spin_unlock_bh(&qdio->req_q_lock);
1353         return retval;
1354 }
1355
1356 /**
1357  * zfcp_fsf_exchange_port_data_sync - request information about local port
1358  * @qdio: pointer to struct zfcp_qdio
1359  * @data: pointer to struct fsf_qtcb_bottom_port
1360  * Returns: 0 on success, error otherwise
1361  */
1362 int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
1363                                      struct fsf_qtcb_bottom_port *data)
1364 {
1365         struct qdio_buffer_element *sbale;
1366         struct zfcp_fsf_req *req = NULL;
1367         int retval = -EIO;
1368
1369         if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1370                 return -EOPNOTSUPP;
1371
1372         spin_lock_bh(&qdio->req_q_lock);
1373         if (zfcp_fsf_req_sbal_get(qdio))
1374                 goto out_unlock;
1375
1376         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA, NULL);
1377
1378         if (IS_ERR(req)) {
1379                 retval = PTR_ERR(req);
1380                 goto out_unlock;
1381         }
1382
1383         if (data)
1384                 req->data = data;
1385
1386         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1387         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1388         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1389
1390         req->handler = zfcp_fsf_exchange_port_data_handler;
1391         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1392         retval = zfcp_fsf_req_send(req);
1393         spin_unlock_bh(&qdio->req_q_lock);
1394
1395         if (!retval)
1396                 wait_for_completion(&req->completion);
1397
1398         zfcp_fsf_req_free(req);
1399
1400         return retval;
1401
1402 out_unlock:
1403         spin_unlock_bh(&qdio->req_q_lock);
1404         return retval;
1405 }
1406
1407 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1408 {
1409         struct zfcp_port *port = req->data;
1410         struct fsf_qtcb_header *header = &req->qtcb->header;
1411         struct fsf_plogi *plogi;
1412
1413         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1414                 goto out;
1415
1416         switch (header->fsf_status) {
1417         case FSF_PORT_ALREADY_OPEN:
1418                 break;
1419         case FSF_ACCESS_DENIED:
1420                 zfcp_fsf_access_denied_port(req, port);
1421                 break;
1422         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1423                 dev_warn(&req->adapter->ccw_device->dev,
1424                          "Not enough FCP adapter resources to open "
1425                          "remote port 0x%016Lx\n",
1426                          (unsigned long long)port->wwpn);
1427                 zfcp_erp_port_failed(port, "fsoph_1", req);
1428                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1429                 break;
1430         case FSF_ADAPTER_STATUS_AVAILABLE:
1431                 switch (header->fsf_status_qual.word[0]) {
1432                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1433                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1434                 case FSF_SQ_NO_RETRY_POSSIBLE:
1435                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1436                         break;
1437                 }
1438                 break;
1439         case FSF_GOOD:
1440                 port->handle = header->port_handle;
1441                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1442                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1443                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1444                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1445                                   &port->status);
1446                 /* check whether D_ID has changed during open */
1447                 /*
1448                  * FIXME: This check is not airtight, as the FCP channel does
1449                  * not monitor closures of target port connections caused on
1450                  * the remote side. Thus, they might miss out on invalidating
1451                  * locally cached WWPNs (and other N_Port parameters) of gone
1452                  * target ports. So, our heroic attempt to make things safe
1453                  * could be undermined by 'open port' response data tagged with
1454                  * obsolete WWPNs. Another reason to monitor potential
1455                  * connection closures ourself at least (by interpreting
1456                  * incoming ELS' and unsolicited status). It just crosses my
1457                  * mind that one should be able to cross-check by means of
1458                  * another GID_PN straight after a port has been opened.
1459                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1460                  */
1461                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1462                 if (req->qtcb->bottom.support.els1_length >=
1463                     FSF_PLOGI_MIN_LEN) {
1464                         if (plogi->serv_param.wwpn != port->wwpn)
1465                                 port->d_id = 0;
1466                         else {
1467                                 port->wwnn = plogi->serv_param.wwnn;
1468                                 zfcp_fc_plogi_evaluate(port, plogi);
1469                         }
1470                 }
1471                 break;
1472         case FSF_UNKNOWN_OP_SUBTYPE:
1473                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1474                 break;
1475         }
1476
1477 out:
1478         zfcp_port_put(port);
1479 }
1480
1481 /**
1482  * zfcp_fsf_open_port - create and send open port request
1483  * @erp_action: pointer to struct zfcp_erp_action
1484  * Returns: 0 on success, error otherwise
1485  */
1486 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1487 {
1488         struct qdio_buffer_element *sbale;
1489         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1490         struct zfcp_port *port = erp_action->port;
1491         struct zfcp_fsf_req *req;
1492         int retval = -EIO;
1493
1494         spin_lock_bh(&qdio->req_q_lock);
1495         if (zfcp_fsf_req_sbal_get(qdio))
1496                 goto out;
1497
1498         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
1499                                   qdio->adapter->pool.erp_req);
1500
1501         if (IS_ERR(req)) {
1502                 retval = PTR_ERR(req);
1503                 goto out;
1504         }
1505
1506         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1507         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1508         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1509         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1510
1511         req->handler = zfcp_fsf_open_port_handler;
1512         req->qtcb->bottom.support.d_id = port->d_id;
1513         req->data = port;
1514         req->erp_action = erp_action;
1515         erp_action->fsf_req = req;
1516         zfcp_port_get(port);
1517
1518         zfcp_fsf_start_erp_timer(req);
1519         retval = zfcp_fsf_req_send(req);
1520         if (retval) {
1521                 zfcp_fsf_req_free(req);
1522                 erp_action->fsf_req = NULL;
1523                 zfcp_port_put(port);
1524         }
1525 out:
1526         spin_unlock_bh(&qdio->req_q_lock);
1527         return retval;
1528 }
1529
1530 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1531 {
1532         struct zfcp_port *port = req->data;
1533
1534         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1535                 return;
1536
1537         switch (req->qtcb->header.fsf_status) {
1538         case FSF_PORT_HANDLE_NOT_VALID:
1539                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1", req);
1540                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1541                 break;
1542         case FSF_ADAPTER_STATUS_AVAILABLE:
1543                 break;
1544         case FSF_GOOD:
1545                 zfcp_erp_modify_port_status(port, "fscph_2", req,
1546                                             ZFCP_STATUS_COMMON_OPEN,
1547                                             ZFCP_CLEAR);
1548                 break;
1549         }
1550 }
1551
1552 /**
1553  * zfcp_fsf_close_port - create and send close port request
1554  * @erp_action: pointer to struct zfcp_erp_action
1555  * Returns: 0 on success, error otherwise
1556  */
1557 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1558 {
1559         struct qdio_buffer_element *sbale;
1560         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1561         struct zfcp_fsf_req *req;
1562         int retval = -EIO;
1563
1564         spin_lock_bh(&qdio->req_q_lock);
1565         if (zfcp_fsf_req_sbal_get(qdio))
1566                 goto out;
1567
1568         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
1569                                   qdio->adapter->pool.erp_req);
1570
1571         if (IS_ERR(req)) {
1572                 retval = PTR_ERR(req);
1573                 goto out;
1574         }
1575
1576         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1577         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1578         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1579         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1580
1581         req->handler = zfcp_fsf_close_port_handler;
1582         req->data = erp_action->port;
1583         req->erp_action = erp_action;
1584         req->qtcb->header.port_handle = erp_action->port->handle;
1585         erp_action->fsf_req = req;
1586
1587         zfcp_fsf_start_erp_timer(req);
1588         retval = zfcp_fsf_req_send(req);
1589         if (retval) {
1590                 zfcp_fsf_req_free(req);
1591                 erp_action->fsf_req = NULL;
1592         }
1593 out:
1594         spin_unlock_bh(&qdio->req_q_lock);
1595         return retval;
1596 }
1597
1598 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1599 {
1600         struct zfcp_wka_port *wka_port = req->data;
1601         struct fsf_qtcb_header *header = &req->qtcb->header;
1602
1603         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1604                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1605                 goto out;
1606         }
1607
1608         switch (header->fsf_status) {
1609         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1610                 dev_warn(&req->adapter->ccw_device->dev,
1611                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1612                 /* fall through */
1613         case FSF_ADAPTER_STATUS_AVAILABLE:
1614                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1615                 /* fall through */
1616         case FSF_ACCESS_DENIED:
1617                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1618                 break;
1619         case FSF_GOOD:
1620                 wka_port->handle = header->port_handle;
1621                 /* fall through */
1622         case FSF_PORT_ALREADY_OPEN:
1623                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1624         }
1625 out:
1626         wake_up(&wka_port->completion_wq);
1627 }
1628
1629 /**
1630  * zfcp_fsf_open_wka_port - create and send open wka-port request
1631  * @wka_port: pointer to struct zfcp_wka_port
1632  * Returns: 0 on success, error otherwise
1633  */
1634 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1635 {
1636         struct qdio_buffer_element *sbale;
1637         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1638         struct zfcp_fsf_req *req;
1639         int retval = -EIO;
1640
1641         spin_lock_bh(&qdio->req_q_lock);
1642         if (zfcp_fsf_req_sbal_get(qdio))
1643                 goto out;
1644
1645         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
1646                                   qdio->adapter->pool.erp_req);
1647
1648         if (unlikely(IS_ERR(req))) {
1649                 retval = PTR_ERR(req);
1650                 goto out;
1651         }
1652
1653         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1654         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1655         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1656         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1657
1658         req->handler = zfcp_fsf_open_wka_port_handler;
1659         req->qtcb->bottom.support.d_id = wka_port->d_id;
1660         req->data = wka_port;
1661
1662         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1663         retval = zfcp_fsf_req_send(req);
1664         if (retval)
1665                 zfcp_fsf_req_free(req);
1666 out:
1667         spin_unlock_bh(&qdio->req_q_lock);
1668         return retval;
1669 }
1670
1671 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1672 {
1673         struct zfcp_wka_port *wka_port = req->data;
1674
1675         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1676                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1677                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1", req);
1678         }
1679
1680         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1681         wake_up(&wka_port->completion_wq);
1682 }
1683
1684 /**
1685  * zfcp_fsf_close_wka_port - create and send close wka port request
1686  * @erp_action: pointer to struct zfcp_erp_action
1687  * Returns: 0 on success, error otherwise
1688  */
1689 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1690 {
1691         struct qdio_buffer_element *sbale;
1692         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1693         struct zfcp_fsf_req *req;
1694         int retval = -EIO;
1695
1696         spin_lock_bh(&qdio->req_q_lock);
1697         if (zfcp_fsf_req_sbal_get(qdio))
1698                 goto out;
1699
1700         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
1701                                   qdio->adapter->pool.erp_req);
1702
1703         if (unlikely(IS_ERR(req))) {
1704                 retval = PTR_ERR(req);
1705                 goto out;
1706         }
1707
1708         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1709         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1710         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1711         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1712
1713         req->handler = zfcp_fsf_close_wka_port_handler;
1714         req->data = wka_port;
1715         req->qtcb->header.port_handle = wka_port->handle;
1716
1717         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1718         retval = zfcp_fsf_req_send(req);
1719         if (retval)
1720                 zfcp_fsf_req_free(req);
1721 out:
1722         spin_unlock_bh(&qdio->req_q_lock);
1723         return retval;
1724 }
1725
1726 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1727 {
1728         struct zfcp_port *port = req->data;
1729         struct fsf_qtcb_header *header = &req->qtcb->header;
1730         struct zfcp_unit *unit;
1731
1732         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1733                 return;
1734
1735         switch (header->fsf_status) {
1736         case FSF_PORT_HANDLE_NOT_VALID:
1737                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1", req);
1738                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1739                 break;
1740         case FSF_ACCESS_DENIED:
1741                 zfcp_fsf_access_denied_port(req, port);
1742                 break;
1743         case FSF_PORT_BOXED:
1744                 /* can't use generic zfcp_erp_modify_port_status because
1745                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1746                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1747                 list_for_each_entry(unit, &port->unit_list_head, list)
1748                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1749                                           &unit->status);
1750                 zfcp_erp_port_boxed(port, "fscpph2", req);
1751                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1752                                ZFCP_STATUS_FSFREQ_RETRY;
1753
1754                 break;
1755         case FSF_ADAPTER_STATUS_AVAILABLE:
1756                 switch (header->fsf_status_qual.word[0]) {
1757                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1758                         /* fall through */
1759                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1760                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1761                         break;
1762                 }
1763                 break;
1764         case FSF_GOOD:
1765                 /* can't use generic zfcp_erp_modify_port_status because
1766                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1767                  */
1768                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1769                 list_for_each_entry(unit, &port->unit_list_head, list)
1770                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1771                                           &unit->status);
1772                 break;
1773         }
1774 }
1775
1776 /**
1777  * zfcp_fsf_close_physical_port - close physical port
1778  * @erp_action: pointer to struct zfcp_erp_action
1779  * Returns: 0 on success
1780  */
1781 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1782 {
1783         struct qdio_buffer_element *sbale;
1784         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1785         struct zfcp_fsf_req *req;
1786         int retval = -EIO;
1787
1788         spin_lock_bh(&qdio->req_q_lock);
1789         if (zfcp_fsf_req_sbal_get(qdio))
1790                 goto out;
1791
1792         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1793                                   qdio->adapter->pool.erp_req);
1794
1795         if (IS_ERR(req)) {
1796                 retval = PTR_ERR(req);
1797                 goto out;
1798         }
1799
1800         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1801         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1802         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1803         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1804
1805         req->data = erp_action->port;
1806         req->qtcb->header.port_handle = erp_action->port->handle;
1807         req->erp_action = erp_action;
1808         req->handler = zfcp_fsf_close_physical_port_handler;
1809         erp_action->fsf_req = req;
1810
1811         zfcp_fsf_start_erp_timer(req);
1812         retval = zfcp_fsf_req_send(req);
1813         if (retval) {
1814                 zfcp_fsf_req_free(req);
1815                 erp_action->fsf_req = NULL;
1816         }
1817 out:
1818         spin_unlock_bh(&qdio->req_q_lock);
1819         return retval;
1820 }
1821
1822 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1823 {
1824         struct zfcp_adapter *adapter = req->adapter;
1825         struct zfcp_unit *unit = req->data;
1826         struct fsf_qtcb_header *header = &req->qtcb->header;
1827         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1828         struct fsf_queue_designator *queue_designator =
1829                                 &header->fsf_status_qual.fsf_queue_designator;
1830         int exclusive, readwrite;
1831
1832         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1833                 return;
1834
1835         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1836                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1837                           ZFCP_STATUS_UNIT_SHARED |
1838                           ZFCP_STATUS_UNIT_READONLY,
1839                           &unit->status);
1840
1841         switch (header->fsf_status) {
1842
1843         case FSF_PORT_HANDLE_NOT_VALID:
1844                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fsouh_1", req);
1845                 /* fall through */
1846         case FSF_LUN_ALREADY_OPEN:
1847                 break;
1848         case FSF_ACCESS_DENIED:
1849                 zfcp_fsf_access_denied_unit(req, unit);
1850                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1851                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1852                 break;
1853         case FSF_PORT_BOXED:
1854                 zfcp_erp_port_boxed(unit->port, "fsouh_2", req);
1855                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1856                                ZFCP_STATUS_FSFREQ_RETRY;
1857                 break;
1858         case FSF_LUN_SHARING_VIOLATION:
1859                 if (header->fsf_status_qual.word[0])
1860                         dev_warn(&adapter->ccw_device->dev,
1861                                  "LUN 0x%Lx on port 0x%Lx is already in "
1862                                  "use by CSS%d, MIF Image ID %x\n",
1863                                  (unsigned long long)unit->fcp_lun,
1864                                  (unsigned long long)unit->port->wwpn,
1865                                  queue_designator->cssid,
1866                                  queue_designator->hla);
1867                 else
1868                         zfcp_act_eval_err(adapter,
1869                                           header->fsf_status_qual.word[2]);
1870                 zfcp_erp_unit_access_denied(unit, "fsouh_3", req);
1871                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1872                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1873                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1874                 break;
1875         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1876                 dev_warn(&adapter->ccw_device->dev,
1877                          "No handle is available for LUN "
1878                          "0x%016Lx on port 0x%016Lx\n",
1879                          (unsigned long long)unit->fcp_lun,
1880                          (unsigned long long)unit->port->wwpn);
1881                 zfcp_erp_unit_failed(unit, "fsouh_4", req);
1882                 /* fall through */
1883         case FSF_INVALID_COMMAND_OPTION:
1884                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1885                 break;
1886         case FSF_ADAPTER_STATUS_AVAILABLE:
1887                 switch (header->fsf_status_qual.word[0]) {
1888                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1889                         zfcp_fc_test_link(unit->port);
1890                         /* fall through */
1891                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1892                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1893                         break;
1894                 }
1895                 break;
1896
1897         case FSF_GOOD:
1898                 unit->handle = header->lun_handle;
1899                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1900
1901                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1902                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1903                     !zfcp_ccw_priv_sch(adapter)) {
1904                         exclusive = (bottom->lun_access_info &
1905                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1906                         readwrite = (bottom->lun_access_info &
1907                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1908
1909                         if (!exclusive)
1910                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1911                                                 &unit->status);
1912
1913                         if (!readwrite) {
1914                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1915                                                 &unit->status);
1916                                 dev_info(&adapter->ccw_device->dev,
1917                                          "SCSI device at LUN 0x%016Lx on port "
1918                                          "0x%016Lx opened read-only\n",
1919                                          (unsigned long long)unit->fcp_lun,
1920                                          (unsigned long long)unit->port->wwpn);
1921                         }
1922
1923                         if (exclusive && !readwrite) {
1924                                 dev_err(&adapter->ccw_device->dev,
1925                                         "Exclusive read-only access not "
1926                                         "supported (unit 0x%016Lx, "
1927                                         "port 0x%016Lx)\n",
1928                                         (unsigned long long)unit->fcp_lun,
1929                                         (unsigned long long)unit->port->wwpn);
1930                                 zfcp_erp_unit_failed(unit, "fsouh_5", req);
1931                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1932                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_6", req);
1933                         } else if (!exclusive && readwrite) {
1934                                 dev_err(&adapter->ccw_device->dev,
1935                                         "Shared read-write access not "
1936                                         "supported (unit 0x%016Lx, port "
1937                                         "0x%016Lx)\n",
1938                                         (unsigned long long)unit->fcp_lun,
1939                                         (unsigned long long)unit->port->wwpn);
1940                                 zfcp_erp_unit_failed(unit, "fsouh_7", req);
1941                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1942                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_8", req);
1943                         }
1944                 }
1945                 break;
1946         }
1947 }
1948
1949 /**
1950  * zfcp_fsf_open_unit - open unit
1951  * @erp_action: pointer to struct zfcp_erp_action
1952  * Returns: 0 on success, error otherwise
1953  */
1954 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1955 {
1956         struct qdio_buffer_element *sbale;
1957         struct zfcp_adapter *adapter = erp_action->adapter;
1958         struct zfcp_qdio *qdio = adapter->qdio;
1959         struct zfcp_fsf_req *req;
1960         int retval = -EIO;
1961
1962         spin_lock_bh(&qdio->req_q_lock);
1963         if (zfcp_fsf_req_sbal_get(qdio))
1964                 goto out;
1965
1966         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_LUN,
1967                                   adapter->pool.erp_req);
1968
1969         if (IS_ERR(req)) {
1970                 retval = PTR_ERR(req);
1971                 goto out;
1972         }
1973
1974         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1975         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1976         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1977         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1978
1979         req->qtcb->header.port_handle = erp_action->port->handle;
1980         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1981         req->handler = zfcp_fsf_open_unit_handler;
1982         req->data = erp_action->unit;
1983         req->erp_action = erp_action;
1984         erp_action->fsf_req = req;
1985
1986         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
1987                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
1988
1989         zfcp_fsf_start_erp_timer(req);
1990         retval = zfcp_fsf_req_send(req);
1991         if (retval) {
1992                 zfcp_fsf_req_free(req);
1993                 erp_action->fsf_req = NULL;
1994         }
1995 out:
1996         spin_unlock_bh(&qdio->req_q_lock);
1997         return retval;
1998 }
1999
2000 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
2001 {
2002         struct zfcp_unit *unit = req->data;
2003
2004         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
2005                 return;
2006
2007         switch (req->qtcb->header.fsf_status) {
2008         case FSF_PORT_HANDLE_NOT_VALID:
2009                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fscuh_1", req);
2010                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2011                 break;
2012         case FSF_LUN_HANDLE_NOT_VALID:
2013                 zfcp_erp_port_reopen(unit->port, 0, "fscuh_2", req);
2014                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2015                 break;
2016         case FSF_PORT_BOXED:
2017                 zfcp_erp_port_boxed(unit->port, "fscuh_3", req);
2018                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2019                                ZFCP_STATUS_FSFREQ_RETRY;
2020                 break;
2021         case FSF_ADAPTER_STATUS_AVAILABLE:
2022                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
2023                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2024                         zfcp_fc_test_link(unit->port);
2025                         /* fall through */
2026                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2027                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2028                         break;
2029                 }
2030                 break;
2031         case FSF_GOOD:
2032                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2033                 break;
2034         }
2035 }
2036
2037 /**
2038  * zfcp_fsf_close_unit - close zfcp unit
2039  * @erp_action: pointer to struct zfcp_unit
2040  * Returns: 0 on success, error otherwise
2041  */
2042 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2043 {
2044         struct qdio_buffer_element *sbale;
2045         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
2046         struct zfcp_fsf_req *req;
2047         int retval = -EIO;
2048
2049         spin_lock_bh(&qdio->req_q_lock);
2050         if (zfcp_fsf_req_sbal_get(qdio))
2051                 goto out;
2052
2053         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_LUN,
2054                                   qdio->adapter->pool.erp_req);
2055
2056         if (IS_ERR(req)) {
2057                 retval = PTR_ERR(req);
2058                 goto out;
2059         }
2060
2061         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2062         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
2063         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2064         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2065
2066         req->qtcb->header.port_handle = erp_action->port->handle;
2067         req->qtcb->header.lun_handle = erp_action->unit->handle;
2068         req->handler = zfcp_fsf_close_unit_handler;
2069         req->data = erp_action->unit;
2070         req->erp_action = erp_action;
2071         erp_action->fsf_req = req;
2072
2073         zfcp_fsf_start_erp_timer(req);
2074         retval = zfcp_fsf_req_send(req);
2075         if (retval) {
2076                 zfcp_fsf_req_free(req);
2077                 erp_action->fsf_req = NULL;
2078         }
2079 out:
2080         spin_unlock_bh(&qdio->req_q_lock);
2081         return retval;
2082 }
2083
2084 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2085 {
2086         lat_rec->sum += lat;
2087         lat_rec->min = min(lat_rec->min, lat);
2088         lat_rec->max = max(lat_rec->max, lat);
2089 }
2090
2091 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2092 {
2093         struct fsf_qual_latency_info *lat_inf;
2094         struct latency_cont *lat;
2095         struct zfcp_unit *unit = req->unit;
2096
2097         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2098
2099         switch (req->qtcb->bottom.io.data_direction) {
2100         case FSF_DATADIR_READ:
2101                 lat = &unit->latencies.read;
2102                 break;
2103         case FSF_DATADIR_WRITE:
2104                 lat = &unit->latencies.write;
2105                 break;
2106         case FSF_DATADIR_CMND:
2107                 lat = &unit->latencies.cmd;
2108                 break;
2109         default:
2110                 return;
2111         }
2112
2113         spin_lock(&unit->latencies.lock);
2114         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2115         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2116         lat->counter++;
2117         spin_unlock(&unit->latencies.lock);
2118 }
2119
2120 #ifdef CONFIG_BLK_DEV_IO_TRACE
2121 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2122 {
2123         struct fsf_qual_latency_info *lat_inf;
2124         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2125         struct request *req = scsi_cmnd->request;
2126         struct zfcp_blk_drv_data trace;
2127         int ticks = fsf_req->adapter->timer_ticks;
2128
2129         trace.flags = 0;
2130         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2131         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2132                 trace.flags |= ZFCP_BLK_LAT_VALID;
2133                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2134                 trace.channel_lat = lat_inf->channel_lat * ticks;
2135                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2136         }
2137         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2138                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2139         trace.inb_usage = fsf_req->queue_req.qdio_inb_usage;
2140         trace.outb_usage = fsf_req->queue_req.qdio_outb_usage;
2141
2142         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2143 }
2144 #else
2145 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2146 {
2147 }
2148 #endif
2149
2150 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2151 {
2152         struct scsi_cmnd *scpnt;
2153         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2154             &(req->qtcb->bottom.io.fcp_rsp);
2155         u32 sns_len;
2156         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2157         unsigned long flags;
2158
2159         read_lock_irqsave(&req->adapter->abort_lock, flags);
2160
2161         scpnt = req->data;
2162         if (unlikely(!scpnt)) {
2163                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2164                 return;
2165         }
2166
2167         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2168                 set_host_byte(scpnt, DID_SOFT_ERROR);
2169                 goto skip_fsfstatus;
2170         }
2171
2172         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2173                 set_host_byte(scpnt, DID_ERROR);
2174                 goto skip_fsfstatus;
2175         }
2176
2177         set_msg_byte(scpnt, COMMAND_COMPLETE);
2178
2179         scpnt->result |= fcp_rsp_iu->scsi_status;
2180
2181         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2182                 zfcp_fsf_req_latency(req);
2183
2184         zfcp_fsf_trace_latency(req);
2185
2186         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2187                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2188                         set_host_byte(scpnt, DID_OK);
2189                 else {
2190                         set_host_byte(scpnt, DID_ERROR);
2191                         goto skip_fsfstatus;
2192                 }
2193         }
2194
2195         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2196                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2197                           fcp_rsp_iu->fcp_rsp_len;
2198                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2199                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2200
2201                 memcpy(scpnt->sense_buffer,
2202                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2203         }
2204
2205         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2206                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2207                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2208                     scpnt->underflow)
2209                         set_host_byte(scpnt, DID_ERROR);
2210         }
2211 skip_fsfstatus:
2212         if (scpnt->result != 0)
2213                 zfcp_dbf_scsi_result("erro", 3, req->adapter->dbf, scpnt, req);
2214         else if (scpnt->retries > 0)
2215                 zfcp_dbf_scsi_result("retr", 4, req->adapter->dbf, scpnt, req);
2216         else
2217                 zfcp_dbf_scsi_result("norm", 6, req->adapter->dbf, scpnt, req);
2218
2219         scpnt->host_scribble = NULL;
2220         (scpnt->scsi_done) (scpnt);
2221         /*
2222          * We must hold this lock until scsi_done has been called.
2223          * Otherwise we may call scsi_done after abort regarding this
2224          * command has completed.
2225          * Note: scsi_done must not block!
2226          */
2227         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2228 }
2229
2230 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2231 {
2232         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2233             &(req->qtcb->bottom.io.fcp_rsp);
2234         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2235
2236         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2237              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2238                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2239 }
2240
2241
2242 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2243 {
2244         struct zfcp_unit *unit;
2245         struct fsf_qtcb_header *header = &req->qtcb->header;
2246
2247         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2248                 unit = req->data;
2249         else
2250                 unit = req->unit;
2251
2252         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2253                 goto skip_fsfstatus;
2254
2255         switch (header->fsf_status) {
2256         case FSF_HANDLE_MISMATCH:
2257         case FSF_PORT_HANDLE_NOT_VALID:
2258                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fssfch1", req);
2259                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2260                 break;
2261         case FSF_FCPLUN_NOT_VALID:
2262         case FSF_LUN_HANDLE_NOT_VALID:
2263                 zfcp_erp_port_reopen(unit->port, 0, "fssfch2", req);
2264                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2265                 break;
2266         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2267                 zfcp_fsf_class_not_supp(req);
2268                 break;
2269         case FSF_ACCESS_DENIED:
2270                 zfcp_fsf_access_denied_unit(req, unit);
2271                 break;
2272         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2273                 dev_err(&req->adapter->ccw_device->dev,
2274                         "Incorrect direction %d, unit 0x%016Lx on port "
2275                         "0x%016Lx closed\n",
2276                         req->qtcb->bottom.io.data_direction,
2277                         (unsigned long long)unit->fcp_lun,
2278                         (unsigned long long)unit->port->wwpn);
2279                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch3",
2280                                           req);
2281                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2282                 break;
2283         case FSF_CMND_LENGTH_NOT_VALID:
2284                 dev_err(&req->adapter->ccw_device->dev,
2285                         "Incorrect CDB length %d, unit 0x%016Lx on "
2286                         "port 0x%016Lx closed\n",
2287                         req->qtcb->bottom.io.fcp_cmnd_length,
2288                         (unsigned long long)unit->fcp_lun,
2289                         (unsigned long long)unit->port->wwpn);
2290                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch4",
2291                                           req);
2292                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2293                 break;
2294         case FSF_PORT_BOXED:
2295                 zfcp_erp_port_boxed(unit->port, "fssfch5", req);
2296                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2297                                ZFCP_STATUS_FSFREQ_RETRY;
2298                 break;
2299         case FSF_LUN_BOXED:
2300                 zfcp_erp_unit_boxed(unit, "fssfch6", req);
2301                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2302                                ZFCP_STATUS_FSFREQ_RETRY;
2303                 break;
2304         case FSF_ADAPTER_STATUS_AVAILABLE:
2305                 if (header->fsf_status_qual.word[0] ==
2306                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2307                         zfcp_fc_test_link(unit->port);
2308                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2309                 break;
2310         }
2311 skip_fsfstatus:
2312         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2313                 zfcp_fsf_send_fcp_ctm_handler(req);
2314         else {
2315                 zfcp_fsf_send_fcp_command_task_handler(req);
2316                 req->unit = NULL;
2317                 zfcp_unit_put(unit);
2318         }
2319 }
2320
2321 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2322 {
2323         u32 *fcp_dl_ptr;
2324
2325         /*
2326          * fcp_dl_addr = start address of fcp_cmnd structure +
2327          * size of fixed part + size of dynamically sized add_dcp_cdb field
2328          * SEE FCP-2 documentation
2329          */
2330         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2331                         (fcp_cmd->add_fcp_cdb_length << 2));
2332         *fcp_dl_ptr = fcp_dl;
2333 }
2334
2335 /**
2336  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2337  * @unit: unit where command is sent to
2338  * @scsi_cmnd: scsi command to be sent
2339  */
2340 int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
2341                                    struct scsi_cmnd *scsi_cmnd)
2342 {
2343         struct zfcp_fsf_req *req;
2344         struct fcp_cmnd_iu *fcp_cmnd_iu;
2345         unsigned int sbtype = SBAL_FLAGS0_TYPE_READ;
2346         int real_bytes, retval = -EIO;
2347         struct zfcp_adapter *adapter = unit->port->adapter;
2348         struct zfcp_qdio *qdio = adapter->qdio;
2349
2350         if (unlikely(!(atomic_read(&unit->status) &
2351                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2352                 return -EBUSY;
2353
2354         spin_lock(&qdio->req_q_lock);
2355         if (atomic_read(&qdio->req_q.count) <= 0) {
2356                 atomic_inc(&qdio->req_q_full);
2357                 goto out;
2358         }
2359
2360         req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
2361                                   adapter->pool.scsi_req);
2362
2363         if (IS_ERR(req)) {
2364                 retval = PTR_ERR(req);
2365                 goto out;
2366         }
2367
2368         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2369         zfcp_unit_get(unit);
2370         req->unit = unit;
2371         req->data = scsi_cmnd;
2372         req->handler = zfcp_fsf_send_fcp_command_handler;
2373         req->qtcb->header.lun_handle = unit->handle;
2374         req->qtcb->header.port_handle = unit->port->handle;
2375         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2376
2377         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2378
2379         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2380         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2381         /*
2382          * set depending on data direction:
2383          *      data direction bits in SBALE (SB Type)
2384          *      data direction bits in QTCB
2385          *      data direction bits in FCP_CMND IU
2386          */
2387         switch (scsi_cmnd->sc_data_direction) {
2388         case DMA_NONE:
2389                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2390                 break;
2391         case DMA_FROM_DEVICE:
2392                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2393                 fcp_cmnd_iu->rddata = 1;
2394                 break;
2395         case DMA_TO_DEVICE:
2396                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2397                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2398                 fcp_cmnd_iu->wddata = 1;
2399                 break;
2400         case DMA_BIDIRECTIONAL:
2401                 goto failed_scsi_cmnd;
2402         }
2403
2404         if (likely((scsi_cmnd->device->simple_tags) ||
2405                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2406                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2407                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2408         else
2409                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2410
2411         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2412                 fcp_cmnd_iu->add_fcp_cdb_length =
2413                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2414
2415         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2416
2417         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2418                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2419
2420         real_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->queue_req, sbtype,
2421                                              scsi_sglist(scsi_cmnd),
2422                                              FSF_MAX_SBALS_PER_REQ);
2423         if (unlikely(real_bytes < 0)) {
2424                 if (req->queue_req.sbal_number >= FSF_MAX_SBALS_PER_REQ) {
2425                         dev_err(&adapter->ccw_device->dev,
2426                                 "Oversize data package, unit 0x%016Lx "
2427                                 "on port 0x%016Lx closed\n",
2428                                 (unsigned long long)unit->fcp_lun,
2429                                 (unsigned long long)unit->port->wwpn);
2430                         zfcp_erp_unit_shutdown(unit, 0, "fssfct1", req);
2431                         retval = -EINVAL;
2432                 }
2433                 goto failed_scsi_cmnd;
2434         }
2435
2436         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2437
2438         retval = zfcp_fsf_req_send(req);
2439         if (unlikely(retval))
2440                 goto failed_scsi_cmnd;
2441
2442         goto out;
2443
2444 failed_scsi_cmnd:
2445         zfcp_unit_put(unit);
2446         zfcp_fsf_req_free(req);
2447         scsi_cmnd->host_scribble = NULL;
2448 out:
2449         spin_unlock(&qdio->req_q_lock);
2450         return retval;
2451 }
2452
2453 /**
2454  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2455  * @unit: pointer to struct zfcp_unit
2456  * @tm_flags: unsigned byte for task management flags
2457  * Returns: on success pointer to struct fsf_req, NULL otherwise
2458  */
2459 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
2460 {
2461         struct qdio_buffer_element *sbale;
2462         struct zfcp_fsf_req *req = NULL;
2463         struct fcp_cmnd_iu *fcp_cmnd_iu;
2464         struct zfcp_qdio *qdio = unit->port->adapter->qdio;
2465
2466         if (unlikely(!(atomic_read(&unit->status) &
2467                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2468                 return NULL;
2469
2470         spin_lock_bh(&qdio->req_q_lock);
2471         if (zfcp_fsf_req_sbal_get(qdio))
2472                 goto out;
2473
2474         req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
2475                                   qdio->adapter->pool.scsi_req);
2476
2477         if (IS_ERR(req)) {
2478                 req = NULL;
2479                 goto out;
2480         }
2481
2482         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2483         req->data = unit;
2484         req->handler = zfcp_fsf_send_fcp_command_handler;
2485         req->qtcb->header.lun_handle = unit->handle;
2486         req->qtcb->header.port_handle = unit->port->handle;
2487         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2488         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2489         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2490                                                 sizeof(u32);
2491
2492         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
2493         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2494         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2495
2496         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2497         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2498         fcp_cmnd_iu->task_management_flags = tm_flags;
2499
2500         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2501         if (!zfcp_fsf_req_send(req))
2502                 goto out;
2503
2504         zfcp_fsf_req_free(req);
2505         req = NULL;
2506 out:
2507         spin_unlock_bh(&qdio->req_q_lock);
2508         return req;
2509 }
2510
2511 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2512 {
2513 }
2514
2515 /**
2516  * zfcp_fsf_control_file - control file upload/download
2517  * @adapter: pointer to struct zfcp_adapter
2518  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2519  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2520  */
2521 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2522                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2523 {
2524         struct qdio_buffer_element *sbale;
2525         struct zfcp_qdio *qdio = adapter->qdio;
2526         struct zfcp_fsf_req *req = NULL;
2527         struct fsf_qtcb_bottom_support *bottom;
2528         int direction, retval = -EIO, bytes;
2529
2530         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2531                 return ERR_PTR(-EOPNOTSUPP);
2532
2533         switch (fsf_cfdc->command) {
2534         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2535                 direction = SBAL_FLAGS0_TYPE_WRITE;
2536                 break;
2537         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2538                 direction = SBAL_FLAGS0_TYPE_READ;
2539                 break;
2540         default:
2541                 return ERR_PTR(-EINVAL);
2542         }
2543
2544         spin_lock_bh(&qdio->req_q_lock);
2545         if (zfcp_fsf_req_sbal_get(qdio))
2546                 goto out;
2547
2548         req = zfcp_fsf_req_create(qdio, fsf_cfdc->command, NULL);
2549         if (IS_ERR(req)) {
2550                 retval = -EPERM;
2551                 goto out;
2552         }
2553
2554         req->handler = zfcp_fsf_control_file_handler;
2555
2556         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
2557         sbale[0].flags |= direction;
2558
2559         bottom = &req->qtcb->bottom.support;
2560         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2561         bottom->option = fsf_cfdc->option;
2562
2563         bytes = zfcp_qdio_sbals_from_sg(qdio, &req->queue_req,
2564                                         direction, fsf_cfdc->sg,
2565                                         FSF_MAX_SBALS_PER_REQ);
2566         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2567                 zfcp_fsf_req_free(req);
2568                 goto out;
2569         }
2570
2571         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2572         retval = zfcp_fsf_req_send(req);
2573 out:
2574         spin_unlock_bh(&qdio->req_q_lock);
2575
2576         if (!retval) {
2577                 wait_for_completion(&req->completion);
2578                 return req;
2579         }
2580         return ERR_PTR(retval);
2581 }
2582
2583 /**
2584  * zfcp_fsf_reqid_check - validate req_id contained in SBAL returned by QDIO
2585  * @adapter: pointer to struct zfcp_adapter
2586  * @sbal_idx: response queue index of SBAL to be processed
2587  */
2588 void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx)
2589 {
2590         struct zfcp_adapter *adapter = qdio->adapter;
2591         struct qdio_buffer *sbal = qdio->resp_q.sbal[sbal_idx];
2592         struct qdio_buffer_element *sbale;
2593         struct zfcp_fsf_req *fsf_req;
2594         unsigned long flags, req_id;
2595         int idx;
2596
2597         for (idx = 0; idx < QDIO_MAX_ELEMENTS_PER_BUFFER; idx++) {
2598
2599                 sbale = &sbal->element[idx];
2600                 req_id = (unsigned long) sbale->addr;
2601                 spin_lock_irqsave(&adapter->req_list_lock, flags);
2602                 fsf_req = zfcp_reqlist_find(adapter, req_id);
2603
2604                 if (!fsf_req)
2605                         /*
2606                          * Unknown request means that we have potentially memory
2607                          * corruption and must stop the machine immediately.
2608                          */
2609                         panic("error: unknown req_id (%lx) on adapter %s.\n",
2610                               req_id, dev_name(&adapter->ccw_device->dev));
2611
2612                 list_del(&fsf_req->list);
2613                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
2614
2615                 fsf_req->queue_req.sbal_response = sbal_idx;
2616                 fsf_req->queue_req.qdio_inb_usage =
2617                         atomic_read(&qdio->resp_q.count);
2618                 zfcp_fsf_req_complete(fsf_req);
2619
2620                 if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
2621                         break;
2622         }
2623 }