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

   1 /*
   2  * zfcp device driver
   3  *
   4  * Implementation of FSF commands.
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/blktrace_api.h>
  13 #include "zfcp_ext.h"
  14 #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_hba_dbf_event_fsf_unsol("dism", adapter, sr_buf);
 252                 mempool_free(sr_buf, adapter->pool.status_read_data);
 253                 zfcp_fsf_req_free(req);
 254                 return;
 255         }
 256
 257         zfcp_hba_dbf_event_fsf_unsol("read", adapter, 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_hba_dbf_event_berr(adapter, 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_hba_dbf_event_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_hba_dbf_event_fsf_unsol("fail", adapter, 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_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_san_dbf_event_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         req->qtcb->bottom.support.resp_buf_length = bytes;
1064
1065         return 0;
1066 }
1067
1068 /**
1069  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1070  * @ct: pointer to struct zfcp_send_ct with data for request
1071  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1072  * @erp_action: if non-null the Generic Service request sent within ERP
1073  */
1074 int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1075                      struct zfcp_erp_action *erp_action)
1076 {
1077         struct zfcp_wka_port *wka_port = ct->wka_port;
1078         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1079         struct zfcp_fsf_req *req;
1080         int ret = -EIO;
1081
1082         spin_lock_bh(&qdio->req_q_lock);
1083         if (zfcp_fsf_req_sbal_get(qdio))
1084                 goto out;
1085
1086         req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_GENERIC, pool);
1087
1088         if (IS_ERR(req)) {
1089                 ret = PTR_ERR(req);
1090                 goto out;
1091         }
1092
1093         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1094         ret = zfcp_fsf_setup_ct_els_sbals(req, ct->req, ct->resp,
1095                                           FSF_MAX_SBALS_PER_REQ);
1096         if (ret)
1097                 goto failed_send;
1098
1099         req->handler = zfcp_fsf_send_ct_handler;
1100         req->qtcb->header.port_handle = wka_port->handle;
1101         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1102         req->qtcb->bottom.support.timeout = ct->timeout;
1103         req->data = ct;
1104
1105         zfcp_san_dbf_event_ct_request(req);
1106
1107         if (erp_action) {
1108                 erp_action->fsf_req = req;
1109                 req->erp_action = erp_action;
1110                 zfcp_fsf_start_erp_timer(req);
1111         } else
1112                 zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1113
1114         ret = zfcp_fsf_req_send(req);
1115         if (ret)
1116                 goto failed_send;
1117
1118         goto out;
1119
1120 failed_send:
1121         zfcp_fsf_req_free(req);
1122         if (erp_action)
1123                 erp_action->fsf_req = NULL;
1124 out:
1125         spin_unlock_bh(&qdio->req_q_lock);
1126         return ret;
1127 }
1128
1129 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1130 {
1131         struct zfcp_send_els *send_els = req->data;
1132         struct zfcp_port *port = send_els->port;
1133         struct fsf_qtcb_header *header = &req->qtcb->header;
1134
1135         send_els->status = -EINVAL;
1136
1137         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1138                 goto skip_fsfstatus;
1139
1140         switch (header->fsf_status) {
1141         case FSF_GOOD:
1142                 zfcp_san_dbf_event_els_response(req);
1143                 send_els->status = 0;
1144                 break;
1145         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1146                 zfcp_fsf_class_not_supp(req);
1147                 break;
1148         case FSF_ADAPTER_STATUS_AVAILABLE:
1149                 switch (header->fsf_status_qual.word[0]){
1150                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1151                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1152                                 zfcp_test_link(port);
1153                         /*fall through */
1154                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1155                 case FSF_SQ_RETRY_IF_POSSIBLE:
1156                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1157                         break;
1158                 }
1159                 break;
1160         case FSF_ELS_COMMAND_REJECTED:
1161         case FSF_PAYLOAD_SIZE_MISMATCH:
1162         case FSF_REQUEST_SIZE_TOO_LARGE:
1163         case FSF_RESPONSE_SIZE_TOO_LARGE:
1164                 break;
1165         case FSF_ACCESS_DENIED:
1166                 if (port)
1167                         zfcp_fsf_access_denied_port(req, port);
1168                 break;
1169         case FSF_SBAL_MISMATCH:
1170                 /* should never occure, avoided in zfcp_fsf_send_els */
1171                 /* fall through */
1172         default:
1173                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1174                 break;
1175         }
1176 skip_fsfstatus:
1177         if (send_els->handler)
1178                 send_els->handler(send_els->handler_data);
1179 }
1180
1181 /**
1182  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1183  * @els: pointer to struct zfcp_send_els with data for the command
1184  */
1185 int zfcp_fsf_send_els(struct zfcp_send_els *els)
1186 {
1187         struct zfcp_fsf_req *req;
1188         struct zfcp_qdio *qdio = els->adapter->qdio;
1189         struct fsf_qtcb_bottom_support *bottom;
1190         int ret = -EIO;
1191
1192         spin_lock_bh(&qdio->req_q_lock);
1193         if (zfcp_fsf_req_sbal_get(qdio))
1194                 goto out;
1195
1196         req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_ELS, NULL);
1197
1198         if (IS_ERR(req)) {
1199                 ret = PTR_ERR(req);
1200                 goto out;
1201         }
1202
1203         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1204         ret = zfcp_fsf_setup_ct_els_sbals(req, els->req, els->resp, 2);
1205
1206         if (ret)
1207                 goto failed_send;
1208
1209         bottom = &req->qtcb->bottom.support;
1210         req->handler = zfcp_fsf_send_els_handler;
1211         bottom->d_id = els->d_id;
1212         bottom->service_class = FSF_CLASS_3;
1213         bottom->timeout = 2 * R_A_TOV;
1214         req->data = els;
1215
1216         zfcp_san_dbf_event_els_request(req);
1217
1218         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1219         ret = zfcp_fsf_req_send(req);
1220         if (ret)
1221                 goto failed_send;
1222
1223         goto out;
1224
1225 failed_send:
1226         zfcp_fsf_req_free(req);
1227 out:
1228         spin_unlock_bh(&qdio->req_q_lock);
1229         return ret;
1230 }
1231
1232 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1233 {
1234         struct qdio_buffer_element *sbale;
1235         struct zfcp_fsf_req *req;
1236         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1237         int retval = -EIO;
1238
1239         spin_lock_bh(&qdio->req_q_lock);
1240         if (zfcp_fsf_req_sbal_get(qdio))
1241                 goto out;
1242
1243         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1244                                   qdio->adapter->pool.erp_req);
1245
1246         if (IS_ERR(req)) {
1247                 retval = PTR_ERR(req);
1248                 goto out;
1249         }
1250
1251         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1252         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1253         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1254         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1255
1256         req->qtcb->bottom.config.feature_selection =
1257                         FSF_FEATURE_CFDC |
1258                         FSF_FEATURE_LUN_SHARING |
1259                         FSF_FEATURE_NOTIFICATION_LOST |
1260                         FSF_FEATURE_UPDATE_ALERT;
1261         req->erp_action = erp_action;
1262         req->handler = zfcp_fsf_exchange_config_data_handler;
1263         erp_action->fsf_req = req;
1264
1265         zfcp_fsf_start_erp_timer(req);
1266         retval = zfcp_fsf_req_send(req);
1267         if (retval) {
1268                 zfcp_fsf_req_free(req);
1269                 erp_action->fsf_req = NULL;
1270         }
1271 out:
1272         spin_unlock_bh(&qdio->req_q_lock);
1273         return retval;
1274 }
1275
1276 int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
1277                                        struct fsf_qtcb_bottom_config *data)
1278 {
1279         struct qdio_buffer_element *sbale;
1280         struct zfcp_fsf_req *req = NULL;
1281         int retval = -EIO;
1282
1283         spin_lock_bh(&qdio->req_q_lock);
1284         if (zfcp_fsf_req_sbal_get(qdio))
1285                 goto out_unlock;
1286
1287         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA, NULL);
1288
1289         if (IS_ERR(req)) {
1290                 retval = PTR_ERR(req);
1291                 goto out_unlock;
1292         }
1293
1294         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1295         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1296         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1297         req->handler = zfcp_fsf_exchange_config_data_handler;
1298
1299         req->qtcb->bottom.config.feature_selection =
1300                         FSF_FEATURE_CFDC |
1301                         FSF_FEATURE_LUN_SHARING |
1302                         FSF_FEATURE_NOTIFICATION_LOST |
1303                         FSF_FEATURE_UPDATE_ALERT;
1304
1305         if (data)
1306                 req->data = data;
1307
1308         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1309         retval = zfcp_fsf_req_send(req);
1310         spin_unlock_bh(&qdio->req_q_lock);
1311         if (!retval)
1312                 wait_for_completion(&req->completion);
1313
1314         zfcp_fsf_req_free(req);
1315         return retval;
1316
1317 out_unlock:
1318         spin_unlock_bh(&qdio->req_q_lock);
1319         return retval;
1320 }
1321
1322 /**
1323  * zfcp_fsf_exchange_port_data - request information about local port
1324  * @erp_action: ERP action for the adapter for which port data is requested
1325  * Returns: 0 on success, error otherwise
1326  */
1327 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1328 {
1329         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1330         struct qdio_buffer_element *sbale;
1331         struct zfcp_fsf_req *req;
1332         int retval = -EIO;
1333
1334         if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1335                 return -EOPNOTSUPP;
1336
1337         spin_lock_bh(&qdio->req_q_lock);
1338         if (zfcp_fsf_req_sbal_get(qdio))
1339                 goto out;
1340
1341         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA,
1342                                   qdio->adapter->pool.erp_req);
1343
1344         if (IS_ERR(req)) {
1345                 retval = PTR_ERR(req);
1346                 goto out;
1347         }
1348
1349         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1350         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1351         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1352         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1353
1354         req->handler = zfcp_fsf_exchange_port_data_handler;
1355         req->erp_action = erp_action;
1356         erp_action->fsf_req = req;
1357
1358         zfcp_fsf_start_erp_timer(req);
1359         retval = zfcp_fsf_req_send(req);
1360         if (retval) {
1361                 zfcp_fsf_req_free(req);
1362                 erp_action->fsf_req = NULL;
1363         }
1364 out:
1365         spin_unlock_bh(&qdio->req_q_lock);
1366         return retval;
1367 }
1368
1369 /**
1370  * zfcp_fsf_exchange_port_data_sync - request information about local port
1371  * @qdio: pointer to struct zfcp_qdio
1372  * @data: pointer to struct fsf_qtcb_bottom_port
1373  * Returns: 0 on success, error otherwise
1374  */
1375 int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
1376                                      struct fsf_qtcb_bottom_port *data)
1377 {
1378         struct qdio_buffer_element *sbale;
1379         struct zfcp_fsf_req *req = NULL;
1380         int retval = -EIO;
1381
1382         if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1383                 return -EOPNOTSUPP;
1384
1385         spin_lock_bh(&qdio->req_q_lock);
1386         if (zfcp_fsf_req_sbal_get(qdio))
1387                 goto out_unlock;
1388
1389         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA, NULL);
1390
1391         if (IS_ERR(req)) {
1392                 retval = PTR_ERR(req);
1393                 goto out_unlock;
1394         }
1395
1396         if (data)
1397                 req->data = data;
1398
1399         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1400         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1401         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1402
1403         req->handler = zfcp_fsf_exchange_port_data_handler;
1404         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1405         retval = zfcp_fsf_req_send(req);
1406         spin_unlock_bh(&qdio->req_q_lock);
1407
1408         if (!retval)
1409                 wait_for_completion(&req->completion);
1410
1411         zfcp_fsf_req_free(req);
1412
1413         return retval;
1414
1415 out_unlock:
1416         spin_unlock_bh(&qdio->req_q_lock);
1417         return retval;
1418 }
1419
1420 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1421 {
1422         struct zfcp_port *port = req->data;
1423         struct fsf_qtcb_header *header = &req->qtcb->header;
1424         struct fsf_plogi *plogi;
1425
1426         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1427                 goto out;
1428
1429         switch (header->fsf_status) {
1430         case FSF_PORT_ALREADY_OPEN:
1431                 break;
1432         case FSF_ACCESS_DENIED:
1433                 zfcp_fsf_access_denied_port(req, port);
1434                 break;
1435         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1436                 dev_warn(&req->adapter->ccw_device->dev,
1437                          "Not enough FCP adapter resources to open "
1438                          "remote port 0x%016Lx\n",
1439                          (unsigned long long)port->wwpn);
1440                 zfcp_erp_port_failed(port, "fsoph_1", req);
1441                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1442                 break;
1443         case FSF_ADAPTER_STATUS_AVAILABLE:
1444                 switch (header->fsf_status_qual.word[0]) {
1445                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1446                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1447                 case FSF_SQ_NO_RETRY_POSSIBLE:
1448                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1449                         break;
1450                 }
1451                 break;
1452         case FSF_GOOD:
1453                 port->handle = header->port_handle;
1454                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
1455                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1456                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1457                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
1458                                   &port->status);
1459                 /* check whether D_ID has changed during open */
1460                 /*
1461                  * FIXME: This check is not airtight, as the FCP channel does
1462                  * not monitor closures of target port connections caused on
1463                  * the remote side. Thus, they might miss out on invalidating
1464                  * locally cached WWPNs (and other N_Port parameters) of gone
1465                  * target ports. So, our heroic attempt to make things safe
1466                  * could be undermined by 'open port' response data tagged with
1467                  * obsolete WWPNs. Another reason to monitor potential
1468                  * connection closures ourself at least (by interpreting
1469                  * incoming ELS' and unsolicited status). It just crosses my
1470                  * mind that one should be able to cross-check by means of
1471                  * another GID_PN straight after a port has been opened.
1472                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1473                  */
1474                 plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
1475                 if (req->qtcb->bottom.support.els1_length >=
1476                     FSF_PLOGI_MIN_LEN) {
1477                         if (plogi->serv_param.wwpn != port->wwpn)
1478                                 port->d_id = 0;
1479                         else {
1480                                 port->wwnn = plogi->serv_param.wwnn;
1481                                 zfcp_fc_plogi_evaluate(port, plogi);
1482                         }
1483                 }
1484                 break;
1485         case FSF_UNKNOWN_OP_SUBTYPE:
1486                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1487                 break;
1488         }
1489
1490 out:
1491         zfcp_port_put(port);
1492 }
1493
1494 /**
1495  * zfcp_fsf_open_port - create and send open port request
1496  * @erp_action: pointer to struct zfcp_erp_action
1497  * Returns: 0 on success, error otherwise
1498  */
1499 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1500 {
1501         struct qdio_buffer_element *sbale;
1502         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1503         struct zfcp_port *port = erp_action->port;
1504         struct zfcp_fsf_req *req;
1505         int retval = -EIO;
1506
1507         spin_lock_bh(&qdio->req_q_lock);
1508         if (zfcp_fsf_req_sbal_get(qdio))
1509                 goto out;
1510
1511         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
1512                                   qdio->adapter->pool.erp_req);
1513
1514         if (IS_ERR(req)) {
1515                 retval = PTR_ERR(req);
1516                 goto out;
1517         }
1518
1519         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1520         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1521         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1522         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1523
1524         req->handler = zfcp_fsf_open_port_handler;
1525         req->qtcb->bottom.support.d_id = port->d_id;
1526         req->data = port;
1527         req->erp_action = erp_action;
1528         erp_action->fsf_req = req;
1529         zfcp_port_get(port);
1530
1531         zfcp_fsf_start_erp_timer(req);
1532         retval = zfcp_fsf_req_send(req);
1533         if (retval) {
1534                 zfcp_fsf_req_free(req);
1535                 erp_action->fsf_req = NULL;
1536                 zfcp_port_put(port);
1537         }
1538 out:
1539         spin_unlock_bh(&qdio->req_q_lock);
1540         return retval;
1541 }
1542
1543 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1544 {
1545         struct zfcp_port *port = req->data;
1546
1547         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1548                 return;
1549
1550         switch (req->qtcb->header.fsf_status) {
1551         case FSF_PORT_HANDLE_NOT_VALID:
1552                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1", req);
1553                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1554                 break;
1555         case FSF_ADAPTER_STATUS_AVAILABLE:
1556                 break;
1557         case FSF_GOOD:
1558                 zfcp_erp_modify_port_status(port, "fscph_2", req,
1559                                             ZFCP_STATUS_COMMON_OPEN,
1560                                             ZFCP_CLEAR);
1561                 break;
1562         }
1563 }
1564
1565 /**
1566  * zfcp_fsf_close_port - create and send close port request
1567  * @erp_action: pointer to struct zfcp_erp_action
1568  * Returns: 0 on success, error otherwise
1569  */
1570 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1571 {
1572         struct qdio_buffer_element *sbale;
1573         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1574         struct zfcp_fsf_req *req;
1575         int retval = -EIO;
1576
1577         spin_lock_bh(&qdio->req_q_lock);
1578         if (zfcp_fsf_req_sbal_get(qdio))
1579                 goto out;
1580
1581         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
1582                                   qdio->adapter->pool.erp_req);
1583
1584         if (IS_ERR(req)) {
1585                 retval = PTR_ERR(req);
1586                 goto out;
1587         }
1588
1589         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1590         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1591         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1592         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1593
1594         req->handler = zfcp_fsf_close_port_handler;
1595         req->data = erp_action->port;
1596         req->erp_action = erp_action;
1597         req->qtcb->header.port_handle = erp_action->port->handle;
1598         erp_action->fsf_req = req;
1599
1600         zfcp_fsf_start_erp_timer(req);
1601         retval = zfcp_fsf_req_send(req);
1602         if (retval) {
1603                 zfcp_fsf_req_free(req);
1604                 erp_action->fsf_req = NULL;
1605         }
1606 out:
1607         spin_unlock_bh(&qdio->req_q_lock);
1608         return retval;
1609 }
1610
1611 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1612 {
1613         struct zfcp_wka_port *wka_port = req->data;
1614         struct fsf_qtcb_header *header = &req->qtcb->header;
1615
1616         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1617                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1618                 goto out;
1619         }
1620
1621         switch (header->fsf_status) {
1622         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1623                 dev_warn(&req->adapter->ccw_device->dev,
1624                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1625                 /* fall through */
1626         case FSF_ADAPTER_STATUS_AVAILABLE:
1627                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1628                 /* fall through */
1629         case FSF_ACCESS_DENIED:
1630                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1631                 break;
1632         case FSF_GOOD:
1633                 wka_port->handle = header->port_handle;
1634                 /* fall through */
1635         case FSF_PORT_ALREADY_OPEN:
1636                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
1637         }
1638 out:
1639         wake_up(&wka_port->completion_wq);
1640 }
1641
1642 /**
1643  * zfcp_fsf_open_wka_port - create and send open wka-port request
1644  * @wka_port: pointer to struct zfcp_wka_port
1645  * Returns: 0 on success, error otherwise
1646  */
1647 int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
1648 {
1649         struct qdio_buffer_element *sbale;
1650         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1651         struct zfcp_fsf_req *req;
1652         int retval = -EIO;
1653
1654         spin_lock_bh(&qdio->req_q_lock);
1655         if (zfcp_fsf_req_sbal_get(qdio))
1656                 goto out;
1657
1658         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
1659                                   qdio->adapter->pool.erp_req);
1660
1661         if (unlikely(IS_ERR(req))) {
1662                 retval = PTR_ERR(req);
1663                 goto out;
1664         }
1665
1666         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1667         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1668         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1669         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1670
1671         req->handler = zfcp_fsf_open_wka_port_handler;
1672         req->qtcb->bottom.support.d_id = wka_port->d_id;
1673         req->data = wka_port;
1674
1675         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1676         retval = zfcp_fsf_req_send(req);
1677         if (retval)
1678                 zfcp_fsf_req_free(req);
1679 out:
1680         spin_unlock_bh(&qdio->req_q_lock);
1681         return retval;
1682 }
1683
1684 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1685 {
1686         struct zfcp_wka_port *wka_port = req->data;
1687
1688         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1689                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1690                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1", req);
1691         }
1692
1693         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
1694         wake_up(&wka_port->completion_wq);
1695 }
1696
1697 /**
1698  * zfcp_fsf_close_wka_port - create and send close wka port request
1699  * @erp_action: pointer to struct zfcp_erp_action
1700  * Returns: 0 on success, error otherwise
1701  */
1702 int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
1703 {
1704         struct qdio_buffer_element *sbale;
1705         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1706         struct zfcp_fsf_req *req;
1707         int retval = -EIO;
1708
1709         spin_lock_bh(&qdio->req_q_lock);
1710         if (zfcp_fsf_req_sbal_get(qdio))
1711                 goto out;
1712
1713         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
1714                                   qdio->adapter->pool.erp_req);
1715
1716         if (unlikely(IS_ERR(req))) {
1717                 retval = PTR_ERR(req);
1718                 goto out;
1719         }
1720
1721         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1722         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1723         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1724         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1725
1726         req->handler = zfcp_fsf_close_wka_port_handler;
1727         req->data = wka_port;
1728         req->qtcb->header.port_handle = wka_port->handle;
1729
1730         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1731         retval = zfcp_fsf_req_send(req);
1732         if (retval)
1733                 zfcp_fsf_req_free(req);
1734 out:
1735         spin_unlock_bh(&qdio->req_q_lock);
1736         return retval;
1737 }
1738
1739 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
1740 {
1741         struct zfcp_port *port = req->data;
1742         struct fsf_qtcb_header *header = &req->qtcb->header;
1743         struct zfcp_unit *unit;
1744
1745         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1746                 return;
1747
1748         switch (header->fsf_status) {
1749         case FSF_PORT_HANDLE_NOT_VALID:
1750                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1", req);
1751                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1752                 break;
1753         case FSF_ACCESS_DENIED:
1754                 zfcp_fsf_access_denied_port(req, port);
1755                 break;
1756         case FSF_PORT_BOXED:
1757                 /* can't use generic zfcp_erp_modify_port_status because
1758                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
1759                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1760                 list_for_each_entry(unit, &port->unit_list_head, list)
1761                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1762                                           &unit->status);
1763                 zfcp_erp_port_boxed(port, "fscpph2", req);
1764                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1765                                ZFCP_STATUS_FSFREQ_RETRY;
1766
1767                 break;
1768         case FSF_ADAPTER_STATUS_AVAILABLE:
1769                 switch (header->fsf_status_qual.word[0]) {
1770                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1771                         /* fall through */
1772                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1773                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1774                         break;
1775                 }
1776                 break;
1777         case FSF_GOOD:
1778                 /* can't use generic zfcp_erp_modify_port_status because
1779                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
1780                  */
1781                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1782                 list_for_each_entry(unit, &port->unit_list_head, list)
1783                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1784                                           &unit->status);
1785                 break;
1786         }
1787 }
1788
1789 /**
1790  * zfcp_fsf_close_physical_port - close physical port
1791  * @erp_action: pointer to struct zfcp_erp_action
1792  * Returns: 0 on success
1793  */
1794 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
1795 {
1796         struct qdio_buffer_element *sbale;
1797         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1798         struct zfcp_fsf_req *req;
1799         int retval = -EIO;
1800
1801         spin_lock_bh(&qdio->req_q_lock);
1802         if (zfcp_fsf_req_sbal_get(qdio))
1803                 goto out;
1804
1805         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PHYSICAL_PORT,
1806                                   qdio->adapter->pool.erp_req);
1807
1808         if (IS_ERR(req)) {
1809                 retval = PTR_ERR(req);
1810                 goto out;
1811         }
1812
1813         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1814         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1815         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1816         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1817
1818         req->data = erp_action->port;
1819         req->qtcb->header.port_handle = erp_action->port->handle;
1820         req->erp_action = erp_action;
1821         req->handler = zfcp_fsf_close_physical_port_handler;
1822         erp_action->fsf_req = req;
1823
1824         zfcp_fsf_start_erp_timer(req);
1825         retval = zfcp_fsf_req_send(req);
1826         if (retval) {
1827                 zfcp_fsf_req_free(req);
1828                 erp_action->fsf_req = NULL;
1829         }
1830 out:
1831         spin_unlock_bh(&qdio->req_q_lock);
1832         return retval;
1833 }
1834
1835 static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
1836 {
1837         struct zfcp_adapter *adapter = req->adapter;
1838         struct zfcp_unit *unit = req->data;
1839         struct fsf_qtcb_header *header = &req->qtcb->header;
1840         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1841         struct fsf_queue_designator *queue_designator =
1842                                 &header->fsf_status_qual.fsf_queue_designator;
1843         int exclusive, readwrite;
1844
1845         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1846                 return;
1847
1848         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
1849                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
1850                           ZFCP_STATUS_UNIT_SHARED |
1851                           ZFCP_STATUS_UNIT_READONLY,
1852                           &unit->status);
1853
1854         switch (header->fsf_status) {
1855
1856         case FSF_PORT_HANDLE_NOT_VALID:
1857                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fsouh_1", req);
1858                 /* fall through */
1859         case FSF_LUN_ALREADY_OPEN:
1860                 break;
1861         case FSF_ACCESS_DENIED:
1862                 zfcp_fsf_access_denied_unit(req, unit);
1863                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1864                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1865                 break;
1866         case FSF_PORT_BOXED:
1867                 zfcp_erp_port_boxed(unit->port, "fsouh_2", req);
1868                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
1869                                ZFCP_STATUS_FSFREQ_RETRY;
1870                 break;
1871         case FSF_LUN_SHARING_VIOLATION:
1872                 if (header->fsf_status_qual.word[0])
1873                         dev_warn(&adapter->ccw_device->dev,
1874                                  "LUN 0x%Lx on port 0x%Lx is already in "
1875                                  "use by CSS%d, MIF Image ID %x\n",
1876                                  (unsigned long long)unit->fcp_lun,
1877                                  (unsigned long long)unit->port->wwpn,
1878                                  queue_designator->cssid,
1879                                  queue_designator->hla);
1880                 else
1881                         zfcp_act_eval_err(adapter,
1882                                           header->fsf_status_qual.word[2]);
1883                 zfcp_erp_unit_access_denied(unit, "fsouh_3", req);
1884                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
1885                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
1886                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1887                 break;
1888         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
1889                 dev_warn(&adapter->ccw_device->dev,
1890                          "No handle is available for LUN "
1891                          "0x%016Lx on port 0x%016Lx\n",
1892                          (unsigned long long)unit->fcp_lun,
1893                          (unsigned long long)unit->port->wwpn);
1894                 zfcp_erp_unit_failed(unit, "fsouh_4", req);
1895                 /* fall through */
1896         case FSF_INVALID_COMMAND_OPTION:
1897                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1898                 break;
1899         case FSF_ADAPTER_STATUS_AVAILABLE:
1900                 switch (header->fsf_status_qual.word[0]) {
1901                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1902                         zfcp_test_link(unit->port);
1903                         /* fall through */
1904                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1905                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1906                         break;
1907                 }
1908                 break;
1909
1910         case FSF_GOOD:
1911                 unit->handle = header->lun_handle;
1912                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
1913
1914                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
1915                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
1916                     !zfcp_ccw_priv_sch(adapter)) {
1917                         exclusive = (bottom->lun_access_info &
1918                                         FSF_UNIT_ACCESS_EXCLUSIVE);
1919                         readwrite = (bottom->lun_access_info &
1920                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
1921
1922                         if (!exclusive)
1923                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
1924                                                 &unit->status);
1925
1926                         if (!readwrite) {
1927                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
1928                                                 &unit->status);
1929                                 dev_info(&adapter->ccw_device->dev,
1930                                          "SCSI device at LUN 0x%016Lx on port "
1931                                          "0x%016Lx opened read-only\n",
1932                                          (unsigned long long)unit->fcp_lun,
1933                                          (unsigned long long)unit->port->wwpn);
1934                         }
1935
1936                         if (exclusive && !readwrite) {
1937                                 dev_err(&adapter->ccw_device->dev,
1938                                         "Exclusive read-only access not "
1939                                         "supported (unit 0x%016Lx, "
1940                                         "port 0x%016Lx)\n",
1941                                         (unsigned long long)unit->fcp_lun,
1942                                         (unsigned long long)unit->port->wwpn);
1943                                 zfcp_erp_unit_failed(unit, "fsouh_5", req);
1944                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1945                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_6", req);
1946                         } else if (!exclusive && readwrite) {
1947                                 dev_err(&adapter->ccw_device->dev,
1948                                         "Shared read-write access not "
1949                                         "supported (unit 0x%016Lx, port "
1950                                         "0x%016Lx)\n",
1951                                         (unsigned long long)unit->fcp_lun,
1952                                         (unsigned long long)unit->port->wwpn);
1953                                 zfcp_erp_unit_failed(unit, "fsouh_7", req);
1954                                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1955                                 zfcp_erp_unit_shutdown(unit, 0, "fsouh_8", req);
1956                         }
1957                 }
1958                 break;
1959         }
1960 }
1961
1962 /**
1963  * zfcp_fsf_open_unit - open unit
1964  * @erp_action: pointer to struct zfcp_erp_action
1965  * Returns: 0 on success, error otherwise
1966  */
1967 int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
1968 {
1969         struct qdio_buffer_element *sbale;
1970         struct zfcp_adapter *adapter = erp_action->adapter;
1971         struct zfcp_qdio *qdio = adapter->qdio;
1972         struct zfcp_fsf_req *req;
1973         int retval = -EIO;
1974
1975         spin_lock_bh(&qdio->req_q_lock);
1976         if (zfcp_fsf_req_sbal_get(qdio))
1977                 goto out;
1978
1979         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_LUN,
1980                                   adapter->pool.erp_req);
1981
1982         if (IS_ERR(req)) {
1983                 retval = PTR_ERR(req);
1984                 goto out;
1985         }
1986
1987         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1988         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
1989         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1990         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1991
1992         req->qtcb->header.port_handle = erp_action->port->handle;
1993         req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
1994         req->handler = zfcp_fsf_open_unit_handler;
1995         req->data = erp_action->unit;
1996         req->erp_action = erp_action;
1997         erp_action->fsf_req = req;
1998
1999         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2000                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
2001
2002         zfcp_fsf_start_erp_timer(req);
2003         retval = zfcp_fsf_req_send(req);
2004         if (retval) {
2005                 zfcp_fsf_req_free(req);
2006                 erp_action->fsf_req = NULL;
2007         }
2008 out:
2009         spin_unlock_bh(&qdio->req_q_lock);
2010         return retval;
2011 }
2012
2013 static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
2014 {
2015         struct zfcp_unit *unit = req->data;
2016
2017         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
2018                 return;
2019
2020         switch (req->qtcb->header.fsf_status) {
2021         case FSF_PORT_HANDLE_NOT_VALID:
2022                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fscuh_1", req);
2023                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2024                 break;
2025         case FSF_LUN_HANDLE_NOT_VALID:
2026                 zfcp_erp_port_reopen(unit->port, 0, "fscuh_2", req);
2027                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2028                 break;
2029         case FSF_PORT_BOXED:
2030                 zfcp_erp_port_boxed(unit->port, "fscuh_3", req);
2031                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2032                                ZFCP_STATUS_FSFREQ_RETRY;
2033                 break;
2034         case FSF_ADAPTER_STATUS_AVAILABLE:
2035                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
2036                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2037                         zfcp_test_link(unit->port);
2038                         /* fall through */
2039                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2040                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2041                         break;
2042                 }
2043                 break;
2044         case FSF_GOOD:
2045                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2046                 break;
2047         }
2048 }
2049
2050 /**
2051  * zfcp_fsf_close_unit - close zfcp unit
2052  * @erp_action: pointer to struct zfcp_unit
2053  * Returns: 0 on success, error otherwise
2054  */
2055 int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
2056 {
2057         struct qdio_buffer_element *sbale;
2058         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
2059         struct zfcp_fsf_req *req;
2060         int retval = -EIO;
2061
2062         spin_lock_bh(&qdio->req_q_lock);
2063         if (zfcp_fsf_req_sbal_get(qdio))
2064                 goto out;
2065
2066         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_LUN,
2067                                   qdio->adapter->pool.erp_req);
2068
2069         if (IS_ERR(req)) {
2070                 retval = PTR_ERR(req);
2071                 goto out;
2072         }
2073
2074         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2075         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
2076         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2077         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2078
2079         req->qtcb->header.port_handle = erp_action->port->handle;
2080         req->qtcb->header.lun_handle = erp_action->unit->handle;
2081         req->handler = zfcp_fsf_close_unit_handler;
2082         req->data = erp_action->unit;
2083         req->erp_action = erp_action;
2084         erp_action->fsf_req = req;
2085
2086         zfcp_fsf_start_erp_timer(req);
2087         retval = zfcp_fsf_req_send(req);
2088         if (retval) {
2089                 zfcp_fsf_req_free(req);
2090                 erp_action->fsf_req = NULL;
2091         }
2092 out:
2093         spin_unlock_bh(&qdio->req_q_lock);
2094         return retval;
2095 }
2096
2097 static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
2098 {
2099         lat_rec->sum += lat;
2100         lat_rec->min = min(lat_rec->min, lat);
2101         lat_rec->max = max(lat_rec->max, lat);
2102 }
2103
2104 static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
2105 {
2106         struct fsf_qual_latency_info *lat_inf;
2107         struct latency_cont *lat;
2108         struct zfcp_unit *unit = req->unit;
2109
2110         lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
2111
2112         switch (req->qtcb->bottom.io.data_direction) {
2113         case FSF_DATADIR_READ:
2114                 lat = &unit->latencies.read;
2115                 break;
2116         case FSF_DATADIR_WRITE:
2117                 lat = &unit->latencies.write;
2118                 break;
2119         case FSF_DATADIR_CMND:
2120                 lat = &unit->latencies.cmd;
2121                 break;
2122         default:
2123                 return;
2124         }
2125
2126         spin_lock(&unit->latencies.lock);
2127         zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
2128         zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
2129         lat->counter++;
2130         spin_unlock(&unit->latencies.lock);
2131 }
2132
2133 #ifdef CONFIG_BLK_DEV_IO_TRACE
2134 static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2135 {
2136         struct fsf_qual_latency_info *lat_inf;
2137         struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
2138         struct request *req = scsi_cmnd->request;
2139         struct zfcp_blk_drv_data trace;
2140         int ticks = fsf_req->adapter->timer_ticks;
2141
2142         trace.flags = 0;
2143         trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2144         if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
2145                 trace.flags |= ZFCP_BLK_LAT_VALID;
2146                 lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
2147                 trace.channel_lat = lat_inf->channel_lat * ticks;
2148                 trace.fabric_lat = lat_inf->fabric_lat * ticks;
2149         }
2150         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2151                 trace.flags |= ZFCP_BLK_REQ_ERROR;
2152         trace.inb_usage = fsf_req->queue_req.qdio_inb_usage;
2153         trace.outb_usage = fsf_req->queue_req.qdio_outb_usage;
2154
2155         blk_add_driver_data(req->q, req, &trace, sizeof(trace));
2156 }
2157 #else
2158 static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
2159 {
2160 }
2161 #endif
2162
2163 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
2164 {
2165         struct scsi_cmnd *scpnt;
2166         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2167             &(req->qtcb->bottom.io.fcp_rsp);
2168         u32 sns_len;
2169         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2170         unsigned long flags;
2171
2172         read_lock_irqsave(&req->adapter->abort_lock, flags);
2173
2174         scpnt = req->data;
2175         if (unlikely(!scpnt)) {
2176                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2177                 return;
2178         }
2179
2180         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
2181                 set_host_byte(scpnt, DID_SOFT_ERROR);
2182                 goto skip_fsfstatus;
2183         }
2184
2185         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2186                 set_host_byte(scpnt, DID_ERROR);
2187                 goto skip_fsfstatus;
2188         }
2189
2190         set_msg_byte(scpnt, COMMAND_COMPLETE);
2191
2192         scpnt->result |= fcp_rsp_iu->scsi_status;
2193
2194         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
2195                 zfcp_fsf_req_latency(req);
2196
2197         zfcp_fsf_trace_latency(req);
2198
2199         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
2200                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
2201                         set_host_byte(scpnt, DID_OK);
2202                 else {
2203                         set_host_byte(scpnt, DID_ERROR);
2204                         goto skip_fsfstatus;
2205                 }
2206         }
2207
2208         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
2209                 sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
2210                           fcp_rsp_iu->fcp_rsp_len;
2211                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
2212                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
2213
2214                 memcpy(scpnt->sense_buffer,
2215                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
2216         }
2217
2218         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
2219                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
2220                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
2221                     scpnt->underflow)
2222                         set_host_byte(scpnt, DID_ERROR);
2223         }
2224 skip_fsfstatus:
2225         if (scpnt->result != 0)
2226                 zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
2227         else if (scpnt->retries > 0)
2228                 zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
2229         else
2230                 zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);
2231
2232         scpnt->host_scribble = NULL;
2233         (scpnt->scsi_done) (scpnt);
2234         /*
2235          * We must hold this lock until scsi_done has been called.
2236          * Otherwise we may call scsi_done after abort regarding this
2237          * command has completed.
2238          * Note: scsi_done must not block!
2239          */
2240         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2241 }
2242
2243 static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
2244 {
2245         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
2246             &(req->qtcb->bottom.io.fcp_rsp);
2247         char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
2248
2249         if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
2250              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2251                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2252 }
2253
2254
2255 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
2256 {
2257         struct zfcp_unit *unit;
2258         struct fsf_qtcb_header *header = &req->qtcb->header;
2259
2260         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
2261                 unit = req->data;
2262         else
2263                 unit = req->unit;
2264
2265         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2266                 goto skip_fsfstatus;
2267
2268         switch (header->fsf_status) {
2269         case FSF_HANDLE_MISMATCH:
2270         case FSF_PORT_HANDLE_NOT_VALID:
2271                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fssfch1", req);
2272                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2273                 break;
2274         case FSF_FCPLUN_NOT_VALID:
2275         case FSF_LUN_HANDLE_NOT_VALID:
2276                 zfcp_erp_port_reopen(unit->port, 0, "fssfch2", req);
2277                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2278                 break;
2279         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2280                 zfcp_fsf_class_not_supp(req);
2281                 break;
2282         case FSF_ACCESS_DENIED:
2283                 zfcp_fsf_access_denied_unit(req, unit);
2284                 break;
2285         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2286                 dev_err(&req->adapter->ccw_device->dev,
2287                         "Incorrect direction %d, unit 0x%016Lx on port "
2288                         "0x%016Lx closed\n",
2289                         req->qtcb->bottom.io.data_direction,
2290                         (unsigned long long)unit->fcp_lun,
2291                         (unsigned long long)unit->port->wwpn);
2292                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch3",
2293                                           req);
2294                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2295                 break;
2296         case FSF_CMND_LENGTH_NOT_VALID:
2297                 dev_err(&req->adapter->ccw_device->dev,
2298                         "Incorrect CDB length %d, unit 0x%016Lx on "
2299                         "port 0x%016Lx closed\n",
2300                         req->qtcb->bottom.io.fcp_cmnd_length,
2301                         (unsigned long long)unit->fcp_lun,
2302                         (unsigned long long)unit->port->wwpn);
2303                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch4",
2304                                           req);
2305                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2306                 break;
2307         case FSF_PORT_BOXED:
2308                 zfcp_erp_port_boxed(unit->port, "fssfch5", req);
2309                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2310                                ZFCP_STATUS_FSFREQ_RETRY;
2311                 break;
2312         case FSF_LUN_BOXED:
2313                 zfcp_erp_unit_boxed(unit, "fssfch6", req);
2314                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2315                                ZFCP_STATUS_FSFREQ_RETRY;
2316                 break;
2317         case FSF_ADAPTER_STATUS_AVAILABLE:
2318                 if (header->fsf_status_qual.word[0] ==
2319                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2320                         zfcp_test_link(unit->port);
2321                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2322                 break;
2323         }
2324 skip_fsfstatus:
2325         if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
2326                 zfcp_fsf_send_fcp_ctm_handler(req);
2327         else {
2328                 zfcp_fsf_send_fcp_command_task_handler(req);
2329                 req->unit = NULL;
2330                 zfcp_unit_put(unit);
2331         }
2332 }
2333
2334 static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
2335 {
2336         u32 *fcp_dl_ptr;
2337
2338         /*
2339          * fcp_dl_addr = start address of fcp_cmnd structure +
2340          * size of fixed part + size of dynamically sized add_dcp_cdb field
2341          * SEE FCP-2 documentation
2342          */
2343         fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
2344                         (fcp_cmd->add_fcp_cdb_length << 2));
2345         *fcp_dl_ptr = fcp_dl;
2346 }
2347
2348 /**
2349  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
2350  * @unit: unit where command is sent to
2351  * @scsi_cmnd: scsi command to be sent
2352  */
2353 int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
2354                                    struct scsi_cmnd *scsi_cmnd)
2355 {
2356         struct zfcp_fsf_req *req;
2357         struct fcp_cmnd_iu *fcp_cmnd_iu;
2358         unsigned int sbtype = SBAL_FLAGS0_TYPE_READ;
2359         int real_bytes, retval = -EIO;
2360         struct zfcp_adapter *adapter = unit->port->adapter;
2361         struct zfcp_qdio *qdio = adapter->qdio;
2362
2363         if (unlikely(!(atomic_read(&unit->status) &
2364                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2365                 return -EBUSY;
2366
2367         spin_lock(&qdio->req_q_lock);
2368         if (atomic_read(&qdio->req_q.count) <= 0) {
2369                 atomic_inc(&qdio->req_q_full);
2370                 goto out;
2371         }
2372
2373         req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
2374                                   adapter->pool.scsi_req);
2375
2376         if (IS_ERR(req)) {
2377                 retval = PTR_ERR(req);
2378                 goto out;
2379         }
2380
2381         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2382         zfcp_unit_get(unit);
2383         req->unit = unit;
2384         req->data = scsi_cmnd;
2385         req->handler = zfcp_fsf_send_fcp_command_handler;
2386         req->qtcb->header.lun_handle = unit->handle;
2387         req->qtcb->header.port_handle = unit->port->handle;
2388         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2389
2390         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2391
2392         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
2393         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2394         /*
2395          * set depending on data direction:
2396          *      data direction bits in SBALE (SB Type)
2397          *      data direction bits in QTCB
2398          *      data direction bits in FCP_CMND IU
2399          */
2400         switch (scsi_cmnd->sc_data_direction) {
2401         case DMA_NONE:
2402                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2403                 break;
2404         case DMA_FROM_DEVICE:
2405                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
2406                 fcp_cmnd_iu->rddata = 1;
2407                 break;
2408         case DMA_TO_DEVICE:
2409                 req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
2410                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
2411                 fcp_cmnd_iu->wddata = 1;
2412                 break;
2413         case DMA_BIDIRECTIONAL:
2414                 goto failed_scsi_cmnd;
2415         }
2416
2417         if (likely((scsi_cmnd->device->simple_tags) ||
2418                    ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
2419                     (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
2420                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
2421         else
2422                 fcp_cmnd_iu->task_attribute = UNTAGGED;
2423
2424         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
2425                 fcp_cmnd_iu->add_fcp_cdb_length =
2426                         (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
2427
2428         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
2429
2430         req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
2431                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);
2432
2433         real_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->queue_req, sbtype,
2434                                              scsi_sglist(scsi_cmnd),
2435                                              FSF_MAX_SBALS_PER_REQ);
2436         if (unlikely(real_bytes < 0)) {
2437                 if (req->queue_req.sbal_number >= FSF_MAX_SBALS_PER_REQ) {
2438                         dev_err(&adapter->ccw_device->dev,
2439                                 "Oversize data package, unit 0x%016Lx "
2440                                 "on port 0x%016Lx closed\n",
2441                                 (unsigned long long)unit->fcp_lun,
2442                                 (unsigned long long)unit->port->wwpn);
2443                         zfcp_erp_unit_shutdown(unit, 0, "fssfct1", req);
2444                         retval = -EINVAL;
2445                 }
2446                 goto failed_scsi_cmnd;
2447         }
2448
2449         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
2450
2451         retval = zfcp_fsf_req_send(req);
2452         if (unlikely(retval))
2453                 goto failed_scsi_cmnd;
2454
2455         goto out;
2456
2457 failed_scsi_cmnd:
2458         zfcp_unit_put(unit);
2459         zfcp_fsf_req_free(req);
2460         scsi_cmnd->host_scribble = NULL;
2461 out:
2462         spin_unlock(&qdio->req_q_lock);
2463         return retval;
2464 }
2465
2466 /**
2467  * zfcp_fsf_send_fcp_ctm - send SCSI task management command
2468  * @unit: pointer to struct zfcp_unit
2469  * @tm_flags: unsigned byte for task management flags
2470  * Returns: on success pointer to struct fsf_req, NULL otherwise
2471  */
2472 struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
2473 {
2474         struct qdio_buffer_element *sbale;
2475         struct zfcp_fsf_req *req = NULL;
2476         struct fcp_cmnd_iu *fcp_cmnd_iu;
2477         struct zfcp_qdio *qdio = unit->port->adapter->qdio;
2478
2479         if (unlikely(!(atomic_read(&unit->status) &
2480                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2481                 return NULL;
2482
2483         spin_lock_bh(&qdio->req_q_lock);
2484         if (zfcp_fsf_req_sbal_get(qdio))
2485                 goto out;
2486
2487         req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
2488                                   qdio->adapter->pool.scsi_req);
2489
2490         if (IS_ERR(req)) {
2491                 req = NULL;
2492                 goto out;
2493         }
2494
2495         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
2496         req->data = unit;
2497         req->handler = zfcp_fsf_send_fcp_command_handler;
2498         req->qtcb->header.lun_handle = unit->handle;
2499         req->qtcb->header.port_handle = unit->port->handle;
2500         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2501         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2502         req->qtcb->bottom.io.fcp_cmnd_length =  sizeof(struct fcp_cmnd_iu) +
2503                                                 sizeof(u32);
2504
2505         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
2506         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
2507         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2508
2509         fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
2510         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
2511         fcp_cmnd_iu->task_management_flags = tm_flags;
2512
2513         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
2514         if (!zfcp_fsf_req_send(req))
2515                 goto out;
2516
2517         zfcp_fsf_req_free(req);
2518         req = NULL;
2519 out:
2520         spin_unlock_bh(&qdio->req_q_lock);
2521         return req;
2522 }
2523
2524 static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
2525 {
2526 }
2527
2528 /**
2529  * zfcp_fsf_control_file - control file upload/download
2530  * @adapter: pointer to struct zfcp_adapter
2531  * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
2532  * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
2533  */
2534 struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
2535                                            struct zfcp_fsf_cfdc *fsf_cfdc)
2536 {
2537         struct qdio_buffer_element *sbale;
2538         struct zfcp_qdio *qdio = adapter->qdio;
2539         struct zfcp_fsf_req *req = NULL;
2540         struct fsf_qtcb_bottom_support *bottom;
2541         int direction, retval = -EIO, bytes;
2542
2543         if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
2544                 return ERR_PTR(-EOPNOTSUPP);
2545
2546         switch (fsf_cfdc->command) {
2547         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
2548                 direction = SBAL_FLAGS0_TYPE_WRITE;
2549                 break;
2550         case FSF_QTCB_UPLOAD_CONTROL_FILE:
2551                 direction = SBAL_FLAGS0_TYPE_READ;
2552                 break;
2553         default:
2554                 return ERR_PTR(-EINVAL);
2555         }
2556
2557         spin_lock_bh(&qdio->req_q_lock);
2558         if (zfcp_fsf_req_sbal_get(qdio))
2559                 goto out;
2560
2561         req = zfcp_fsf_req_create(qdio, fsf_cfdc->command, NULL);
2562         if (IS_ERR(req)) {
2563                 retval = -EPERM;
2564                 goto out;
2565         }
2566
2567         req->handler = zfcp_fsf_control_file_handler;
2568
2569         sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
2570         sbale[0].flags |= direction;
2571
2572         bottom = &req->qtcb->bottom.support;
2573         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
2574         bottom->option = fsf_cfdc->option;
2575
2576         bytes = zfcp_qdio_sbals_from_sg(qdio, &req->queue_req,
2577                                         direction, fsf_cfdc->sg,
2578                                         FSF_MAX_SBALS_PER_REQ);
2579         if (bytes != ZFCP_CFDC_MAX_SIZE) {
2580                 zfcp_fsf_req_free(req);
2581                 goto out;
2582         }
2583
2584         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2585         retval = zfcp_fsf_req_send(req);
2586 out:
2587         spin_unlock_bh(&qdio->req_q_lock);
2588
2589         if (!retval) {
2590                 wait_for_completion(&req->completion);
2591                 return req;
2592         }
2593         return ERR_PTR(retval);
2594 }
2595
2596 /**
2597  * zfcp_fsf_reqid_check - validate req_id contained in SBAL returned by QDIO
2598  * @adapter: pointer to struct zfcp_adapter
2599  * @sbal_idx: response queue index of SBAL to be processed
2600  */
2601 void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx)
2602 {
2603         struct zfcp_adapter *adapter = qdio->adapter;
2604         struct qdio_buffer *sbal = qdio->resp_q.sbal[sbal_idx];
2605         struct qdio_buffer_element *sbale;
2606         struct zfcp_fsf_req *fsf_req;
2607         unsigned long flags, req_id;
2608         int idx;
2609
2610         for (idx = 0; idx < QDIO_MAX_ELEMENTS_PER_BUFFER; idx++) {
2611
2612                 sbale = &sbal->element[idx];
2613                 req_id = (unsigned long) sbale->addr;
2614                 spin_lock_irqsave(&adapter->req_list_lock, flags);
2615                 fsf_req = zfcp_reqlist_find(adapter, req_id);
2616
2617                 if (!fsf_req)
2618                         /*
2619                          * Unknown request means that we have potentially memory
2620                          * corruption and must stop the machine immediately.
2621                          */
2622                         panic("error: unknown req_id (%lx) on adapter %s.\n",
2623                               req_id, dev_name(&adapter->ccw_device->dev));
2624
2625                 list_del(&fsf_req->list);
2626                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
2627
2628                 fsf_req->queue_req.sbal_response = sbal_idx;
2629                 fsf_req->queue_req.qdio_inb_usage =
2630                         atomic_read(&qdio->resp_q.count);
2631                 zfcp_fsf_req_complete(fsf_req);
2632
2633                 if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
2634                         break;
2635         }
2636 }