ClabureDB: Classified Bug-Reports Database

   /*
    * zfcp device driver
    *
    * Implementation of FSF commands.
    *
    * Copyright IBM Corporation 2002, 2008
    */
   
   #include <linux/blktrace_api.h>
  #include "zfcp_ext.h"
  
  static void zfcp_fsf_request_timeout_handler(unsigned long data)
  {
          struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
          zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 62,
                                  NULL);
  }
  
  static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
                                   unsigned long timeout)
  {
          fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
          fsf_req->timer.data = (unsigned long) fsf_req->adapter;
          fsf_req->timer.expires = jiffies + timeout;
          add_timer(&fsf_req->timer);
  }
  
  static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
  {
          BUG_ON(!fsf_req->erp_action);
          fsf_req->timer.function = zfcp_erp_timeout_handler;
          fsf_req->timer.data = (unsigned long) fsf_req->erp_action;
          fsf_req->timer.expires = jiffies + 30 * HZ;
          add_timer(&fsf_req->timer);
  }
  
  /* association between FSF command and FSF QTCB type */
  static u32 fsf_qtcb_type[] = {
          [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
          [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
          [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
          [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
          [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
          [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
          [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
          [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
          [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
          [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
          [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
          [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
          [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  };
  
  static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
  {
          u16 subtable = table >> 16;
          u16 rule = table & 0xffff;
          const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };
  
          if (subtable && subtable < ARRAY_SIZE(act_type))
                  dev_warn(&adapter->ccw_device->dev,
                           "Access denied according to ACT rule type %s, "
                           "rule %d\n", act_type[subtable], rule);
  }
  
  static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
                                          struct zfcp_port *port)
  {
          struct fsf_qtcb_header *header = &req->qtcb->header;
          dev_warn(&req->adapter->ccw_device->dev,
                   "Access denied to port 0x%016Lx\n",
                   (unsigned long long)port->wwpn);
          zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
          zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
          zfcp_erp_port_access_denied(port, 55, req);
          req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  }
  
  static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
                                          struct zfcp_unit *unit)
  {
          struct fsf_qtcb_header *header = &req->qtcb->header;
          dev_warn(&req->adapter->ccw_device->dev,
                   "Access denied to unit 0x%016Lx on port 0x%016Lx\n",
                   (unsigned long long)unit->fcp_lun,
                   (unsigned long long)unit->port->wwpn);
          zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
          zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
          zfcp_erp_unit_access_denied(unit, 59, req);
          req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  }
  
  static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
  {
          dev_err(&req->adapter->ccw_device->dev, "FCP device not "
                  "operational because of an unsupported FC class\n");
          zfcp_erp_adapter_shutdown(req->adapter, 0, 123, req);
          req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  }
 
 /**
  * zfcp_fsf_req_free - free memory used by fsf request
  * @fsf_req: pointer to struct zfcp_fsf_req
  */
 void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
 {
         if (likely(req->pool)) {
                 mempool_free(req, req->pool);
                 return;
         }
 
         if (req->qtcb) {
                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, req);
                 return;
         }
 }
 
 /**
  * zfcp_fsf_req_dismiss_all - dismiss all fsf requests
  * @adapter: pointer to struct zfcp_adapter
  *
  * Never ever call this without shutting down the adapter first.
  * Otherwise the adapter would continue using and corrupting s390 storage.
  * Included BUG_ON() call to ensure this is done.
  * ERP is supposed to be the only user of this function.
  */
 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 {
         struct zfcp_fsf_req *req, *tmp;
         unsigned long flags;
         LIST_HEAD(remove_queue);
         unsigned int i;
 
         BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
         spin_lock_irqsave(&adapter->req_list_lock, flags);
         for (i = 0; i < REQUEST_LIST_SIZE; i++)
                 list_splice_init(&adapter->req_list[i], &remove_queue);
         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 
         list_for_each_entry_safe(req, tmp, &remove_queue, list) {
                 list_del(&req->list);
                 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
                 zfcp_fsf_req_complete(req);
         }
 }
 
 static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
 {
         struct fsf_status_read_buffer *sr_buf = req->data;
         struct zfcp_adapter *adapter = req->adapter;
         struct zfcp_port *port;
         int d_id = sr_buf->d_id & ZFCP_DID_MASK;
         unsigned long flags;
 
         read_lock_irqsave(&zfcp_data.config_lock, flags);
         list_for_each_entry(port, &adapter->port_list_head, list)
                 if (port->d_id == d_id) {
                         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
                         switch (sr_buf->status_subtype) {
                         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
                                 zfcp_erp_port_reopen(port, 0, 101, req);
                                 break;
                         case FSF_STATUS_READ_SUB_ERROR_PORT:
                                 zfcp_erp_port_shutdown(port, 0, 122, req);
                                 break;
                         }
                         return;
                 }
         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 }
 
 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, u8 id,
                                          struct fsf_link_down_info *link_down)
 {
         struct zfcp_adapter *adapter = req->adapter;
 
         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
                 return;
 
         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 
         if (!link_down)
                 goto out;
 
         switch (link_down->error_code) {
         case FSF_PSQ_LINK_NO_LIGHT:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "There is no light signal from the local "
                          "fibre channel cable\n");
                 break;
         case FSF_PSQ_LINK_WRAP_PLUG:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "There is a wrap plug instead of a fibre "
                          "channel cable\n");
                 break;
         case FSF_PSQ_LINK_NO_FCP:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The adjacent fibre channel node does not "
                          "support FCP\n");
                 break;
         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The FCP device is suspended because of a "
                          "firmware update\n");
                 break;
         case FSF_PSQ_LINK_INVALID_WWPN:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The FCP device detected a WWPN that is "
                          "duplicate or not valid\n");
                 break;
         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The fibre channel fabric does not support NPIV\n");
                 break;
         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The FCP adapter cannot support more NPIV ports\n");
                 break;
         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The adjacent switch cannot support "
                          "more NPIV ports\n");
                 break;
         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The FCP adapter could not log in to the "
                          "fibre channel fabric\n");
                 break;
         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The WWPN assignment file on the FCP adapter "
                          "has been damaged\n");
                 break;
         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The mode table on the FCP adapter "
                          "has been damaged\n");
                 break;
         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "All NPIV ports on the FCP adapter have "
                          "been assigned\n");
                 break;
         default:
                 dev_warn(&req->adapter->ccw_device->dev,
                          "The link between the FCP adapter and "
                          "the FC fabric is down\n");
         }
 out:
         zfcp_erp_adapter_failed(adapter, id, req);
 }
 
 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 {
         struct fsf_status_read_buffer *sr_buf = req->data;
         struct fsf_link_down_info *ldi =
                 (struct fsf_link_down_info *) &sr_buf->payload;
 
         switch (sr_buf->status_subtype) {
         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
                 zfcp_fsf_link_down_info_eval(req, 38, ldi);
                 break;
         case FSF_STATUS_READ_SUB_FDISC_FAILED:
                 zfcp_fsf_link_down_info_eval(req, 39, ldi);
                 break;
         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
                 zfcp_fsf_link_down_info_eval(req, 40, NULL);
         };
 }
 
 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 {
         struct zfcp_adapter *adapter = req->adapter;
         struct fsf_status_read_buffer *sr_buf = req->data;
 
         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, sr_buf);
                 mempool_free(sr_buf, adapter->pool.data_status_read);
                 zfcp_fsf_req_free(req);
                 return;
         }
 
         zfcp_hba_dbf_event_fsf_unsol("read", adapter, sr_buf);
 
         switch (sr_buf->status_type) {
         case FSF_STATUS_READ_PORT_CLOSED:
                 zfcp_fsf_status_read_port_closed(req);
                 break;
         case FSF_STATUS_READ_INCOMING_ELS:
                 zfcp_fc_incoming_els(req);
                 break;
         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
                 break;
         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
                 dev_warn(&adapter->ccw_device->dev,
                          "The error threshold for checksum statistics "
                          "has been exceeded\n");
                 zfcp_hba_dbf_event_berr(adapter, req);
                 break;
         case FSF_STATUS_READ_LINK_DOWN:
                 zfcp_fsf_status_read_link_down(req);
                 break;
         case FSF_STATUS_READ_LINK_UP:
                 dev_info(&adapter->ccw_device->dev,
                          "The local link has been restored\n");
                 /* All ports should be marked as ready to run again */
                 zfcp_erp_modify_adapter_status(adapter, 30, NULL,
                                                ZFCP_STATUS_COMMON_RUNNING,
                                                ZFCP_SET);
                 zfcp_erp_adapter_reopen(adapter,
                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
                                         ZFCP_STATUS_COMMON_ERP_FAILED,
                                         102, req);
                 break;
         case FSF_STATUS_READ_NOTIFICATION_LOST:
                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
                         zfcp_erp_adapter_access_changed(adapter, 135, req);
                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
                         schedule_work(&adapter->scan_work);
                 break;
         case FSF_STATUS_READ_CFDC_UPDATED:
                 zfcp_erp_adapter_access_changed(adapter, 136, req);
                 break;
         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
                 adapter->adapter_features = sr_buf->payload.word[0];
                 break;
         }
 
         mempool_free(sr_buf, adapter->pool.data_status_read);
         zfcp_fsf_req_free(req);
 
         atomic_inc(&adapter->stat_miss);
         queue_work(zfcp_data.work_queue, &adapter->stat_work);
 }
 
 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 {
         switch (req->qtcb->header.fsf_status_qual.word[0]) {
         case FSF_SQ_FCP_RSP_AVAILABLE:
         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
         case FSF_SQ_NO_RETRY_POSSIBLE:
         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                 return;
         case FSF_SQ_COMMAND_ABORTED:
                 req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
                 break;
         case FSF_SQ_NO_RECOM:
                 dev_err(&req->adapter->ccw_device->dev,
                         "The FCP adapter reported a problem "
                         "that cannot be recovered\n");
                 zfcp_erp_adapter_shutdown(req->adapter, 0, 121, req);
                 break;
         }
         /* all non-return stats set FSFREQ_ERROR*/
         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 }
 
 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 {
         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
                 return;
 
         switch (req->qtcb->header.fsf_status) {
         case FSF_UNKNOWN_COMMAND:
                 dev_err(&req->adapter->ccw_device->dev,
                         "The FCP adapter does not recognize the command 0x%x\n",
                         req->qtcb->header.fsf_command);
                 zfcp_erp_adapter_shutdown(req->adapter, 0, 120, req);
                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                 break;
         case FSF_ADAPTER_STATUS_AVAILABLE:
                 zfcp_fsf_fsfstatus_qual_eval(req);
                 break;
         }
 }
 
 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 {
         struct zfcp_adapter *adapter = req->adapter;
         struct fsf_qtcb *qtcb = req->qtcb;
         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 
         zfcp_hba_dbf_event_fsf_response(req);
 
         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
                 return;
         }
 
         switch (qtcb->prefix.prot_status) {
         case FSF_PROT_GOOD:
         case FSF_PROT_FSF_STATUS_PRESENTED:
                 return;
         case FSF_PROT_QTCB_VERSION_ERROR:
                 dev_err(&adapter->ccw_device->dev,
                         "QTCB version 0x%x not supported by FCP adapter "
                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
                         psq->word[0], psq->word[1]);
                 zfcp_erp_adapter_shutdown(adapter, 0, 117, req);
                 break;
         case FSF_PROT_ERROR_STATE:
         case FSF_PROT_SEQ_NUMB_ERROR:
                 zfcp_erp_adapter_reopen(adapter, 0, 98, req);
                 req->status |= ZFCP_STATUS_FSFREQ_RETRY;
                 break;
         case FSF_PROT_UNSUPP_QTCB_TYPE:
                 dev_err(&adapter->ccw_device->dev,
                         "The QTCB type is not supported by the FCP adapter\n");
                 zfcp_erp_adapter_shutdown(adapter, 0, 118, req);
                 break;
         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
                                 &adapter->status);
                 break;
         case FSF_PROT_DUPLICATE_REQUEST_ID:
                 dev_err(&adapter->ccw_device->dev,
                         "0x%Lx is an ambiguous request identifier\n",
                         (unsigned long long)qtcb->bottom.support.req_handle);
                 zfcp_erp_adapter_shutdown(adapter, 0, 78, req);
                 break;
         case FSF_PROT_LINK_DOWN:
                 zfcp_fsf_link_down_info_eval(req, 37, &psq->link_down_info);
                 /* FIXME: reopening adapter now? better wait for link up */
                 zfcp_erp_adapter_reopen(adapter, 0, 79, req);
                 break;
         case FSF_PROT_REEST_QUEUE:
                 /* All ports should be marked as ready to run again */
                 zfcp_erp_modify_adapter_status(adapter, 28, NULL,
                                                ZFCP_STATUS_COMMON_RUNNING,
                                                ZFCP_SET);
                 zfcp_erp_adapter_reopen(adapter,
                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
                                         ZFCP_STATUS_COMMON_ERP_FAILED, 99, req);
                 break;
         default:
                 dev_err(&adapter->ccw_device->dev,
                         "0x%x is not a valid transfer protocol status\n",
                         qtcb->prefix.prot_status);
                 zfcp_erp_adapter_shutdown(adapter, 0, 119, req);
         }
         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 }
 
 /**
  * zfcp_fsf_req_complete - process completion of a FSF request
  * @fsf_req: The FSF request that has been completed.
  *
  * When a request has been completed either from the FCP adapter,
  * or it has been dismissed due to a queue shutdown, this function
  * is called to process the completion status and trigger further
  * events related to the FSF request.
  */
 void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 {
         if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
                 zfcp_fsf_status_read_handler(req);
                 return;
         }
 
         del_timer(&req->timer);
         zfcp_fsf_protstatus_eval(req);
         zfcp_fsf_fsfstatus_eval(req);
         req->handler(req);
 
         if (req->erp_action)
                 zfcp_erp_notify(req->erp_action, 0);
         req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 
         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
                 zfcp_fsf_req_free(req);
         else
         /* notify initiator waiting for the requests completion */
         /*
          * FIXME: Race! We must not access fsf_req here as it might have been
          * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
          * flag. It's an improbable case. But, we have the same paranoia for
          * the cleanup flag already.
          * Might better be handled using complete()?
          * (setting the flag and doing wakeup ought to be atomic
          *  with regard to checking the flag as long as waitqueue is
          *  part of the to be released structure)
          */
                 wake_up(&req->completion_wq);
 }
 
 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 {
         struct fsf_qtcb_bottom_config *bottom;
         struct zfcp_adapter *adapter = req->adapter;
         struct Scsi_Host *shost = adapter->scsi_host;
 
         bottom = &req->qtcb->bottom.config;
 
         if (req->data)
                 memcpy(req->data, bottom, sizeof(*bottom));
 
         fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
         fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
         fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
         fc_host_speed(shost) = bottom->fc_link_speed;
         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 
         adapter->hydra_version = bottom->adapter_type;
         adapter->timer_ticks = bottom->timer_interval;
 
         if (fc_host_permanent_port_name(shost) == -1)
                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
 
         switch (bottom->fc_topology) {
         case FSF_TOPO_P2P:
                 adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
                 adapter->peer_wwpn = bottom->plogi_payload.wwpn;
                 adapter->peer_wwnn = bottom->plogi_payload.wwnn;
                 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
                 break;
         case FSF_TOPO_FABRIC:
                 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
                 break;
         case FSF_TOPO_AL:
                 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
         default:
                 dev_err(&adapter->ccw_device->dev,
                         "Unknown or unsupported arbitrated loop "
                         "fibre channel topology detected\n");
                 zfcp_erp_adapter_shutdown(adapter, 0, 127, req);
                 return -EIO;
         }
 
         return 0;
 }
 
 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 {
         struct zfcp_adapter *adapter = req->adapter;
         struct fsf_qtcb *qtcb = req->qtcb;
         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
         struct Scsi_Host *shost = adapter->scsi_host;
 
         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                 return;
 
         adapter->fsf_lic_version = bottom->lic_version;
         adapter->adapter_features = bottom->adapter_features;
         adapter->connection_features = bottom->connection_features;
         adapter->peer_wwpn = 0;
         adapter->peer_wwnn = 0;
         adapter->peer_d_id = 0;
 
         switch (qtcb->header.fsf_status) {
         case FSF_GOOD:
                 if (zfcp_fsf_exchange_config_evaluate(req))
                         return;
 
                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
                         dev_err(&adapter->ccw_device->dev,
                                 "FCP adapter maximum QTCB size (%d bytes) "
                                 "is too small\n",
                                 bottom->max_qtcb_size);
                         zfcp_erp_adapter_shutdown(adapter, 0, 129, req);
                         return;
                 }
                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
                                 &adapter->status);
                 break;
         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
                 fc_host_node_name(shost) = 0;
                 fc_host_port_name(shost) = 0;
                 fc_host_port_id(shost) = 0;
                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
                 adapter->hydra_version = 0;
 
                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
                                 &adapter->status);
 
                 zfcp_fsf_link_down_info_eval(req, 42,
                         &qtcb->header.fsf_status_qual.link_down_info);
                 break;
         default:
                 zfcp_erp_adapter_shutdown(adapter, 0, 130, req);
                 return;
         }
 
         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
                 adapter->hardware_version = bottom->hardware_version;
                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
                        min(FC_SERIAL_NUMBER_SIZE, 17));
                 EBCASC(fc_host_serial_number(shost),
                        min(FC_SERIAL_NUMBER_SIZE, 17));
         }
 
         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
                 dev_err(&adapter->ccw_device->dev,
                         "The FCP adapter only supports newer "
                         "control block versions\n");
                 zfcp_erp_adapter_shutdown(adapter, 0, 125, req);
                 return;
         }
         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
                 dev_err(&adapter->ccw_device->dev,
                         "The FCP adapter only supports older "
                         "control block versions\n");
                 zfcp_erp_adapter_shutdown(adapter, 0, 126, req);
         }
 }
 
 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 {
         struct zfcp_adapter *adapter = req->adapter;
         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
         struct Scsi_Host *shost = adapter->scsi_host;
 
         if (req->data)
                 memcpy(req->data, bottom, sizeof(*bottom));
 
         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
                 fc_host_permanent_port_name(shost) = bottom->wwpn;
         else
                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
         fc_host_supported_speeds(shost) = bottom->supported_speed;
 }
 
 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 {
         struct fsf_qtcb *qtcb = req->qtcb;
 
         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                 return;
 
         switch (qtcb->header.fsf_status) {
         case FSF_GOOD:
                 zfcp_fsf_exchange_port_evaluate(req);
                 break;
         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
                 zfcp_fsf_exchange_port_evaluate(req);
                 zfcp_fsf_link_down_info_eval(req, 43,
                         &qtcb->header.fsf_status_qual.link_down_info);
                 break;
         }
 }
 
 static int zfcp_fsf_sbal_check(struct zfcp_adapter *adapter)
 {
         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 
         spin_lock_bh(&adapter->req_q_lock);
         if (atomic_read(&req_q->count))
                 return 1;
         spin_unlock_bh(&adapter->req_q_lock);
         return 0;
 }
 
 static int zfcp_fsf_sbal_available(struct zfcp_adapter *adapter)
 {
         unsigned int count = atomic_read(&adapter->req_q.count);
         if (!count)
                 atomic_inc(&adapter->qdio_outb_full);
         return count > 0;
 }
 
 static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
 {
         long ret;
 
         spin_unlock_bh(&adapter->req_q_lock);
         ret = wait_event_interruptible_timeout(adapter->request_wq,
                                         zfcp_fsf_sbal_check(adapter), 5 * HZ);
         if (ret > 0)
                 return 0;
         if (!ret)
                 atomic_inc(&adapter->qdio_outb_full);
 
         spin_lock_bh(&adapter->req_q_lock);
         return -EIO;
 }
 
 static struct zfcp_fsf_req *zfcp_fsf_alloc_noqtcb(mempool_t *pool)
 {
         struct zfcp_fsf_req *req;
         req = mempool_alloc(pool, GFP_ATOMIC);
         if (!req)
                 return NULL;
         memset(req, 0, sizeof(*req));
         req->pool = pool;
         return req;
 }
 
 static struct zfcp_fsf_req *zfcp_fsf_alloc_qtcb(mempool_t *pool)
 {
         struct zfcp_fsf_req_qtcb *qtcb;
 
         if (likely(pool))
                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
         else
                 qtcb = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
                                         GFP_ATOMIC);
         if (unlikely(!qtcb))
                 return NULL;
 
         memset(qtcb, 0, sizeof(*qtcb));
         qtcb->fsf_req.qtcb = &qtcb->qtcb;
         qtcb->fsf_req.pool = pool;
 
         return &qtcb->fsf_req;
 }
 
 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
                                                 u32 fsf_cmd, int req_flags,
                                                 mempool_t *pool)
 {
         struct qdio_buffer_element *sbale;
 
         struct zfcp_fsf_req *req;
         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 
         if (req_flags & ZFCP_REQ_NO_QTCB)
                 req = zfcp_fsf_alloc_noqtcb(pool);
         else
                 req = zfcp_fsf_alloc_qtcb(pool);
 
         if (unlikely(!req))
                 return ERR_PTR(-EIO);
 
         if (adapter->req_no == 0)
                 adapter->req_no++;
 
         INIT_LIST_HEAD(&req->list);
         init_timer(&req->timer);
         init_waitqueue_head(&req->completion_wq);
 
         req->adapter = adapter;
         req->fsf_command = fsf_cmd;
         req->req_id = adapter->req_no++;
         req->sbal_number = 1;
         req->sbal_first = req_q->first;
         req->sbal_last = req_q->first;
         req->sbale_curr = 1;
 
         sbale = zfcp_qdio_sbale_req(req);
         sbale[0].addr = (void *) req->req_id;
         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 
         if (likely(req->qtcb)) {
                 req->qtcb->prefix.req_seq_no = req->adapter->fsf_req_seq_no;
                 req->qtcb->prefix.req_id = req->req_id;
                 req->qtcb->prefix.ulp_info = 26;
                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command];
                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
                 req->qtcb->header.req_handle = req->req_id;
                 req->qtcb->header.fsf_command = req->fsf_command;
                 req->seq_no = adapter->fsf_req_seq_no;
                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
                 sbale[1].addr = (void *) req->qtcb;
                 sbale[1].length = sizeof(struct fsf_qtcb);
         }
 
         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) {
                 zfcp_fsf_req_free(req);
                 return ERR_PTR(-EIO);
         }
 
         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP))
                 req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
 
         return req;
 }
 
 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 {
         struct zfcp_adapter *adapter = req->adapter;
         unsigned long flags;
         int idx;
 
         /* put allocated FSF request into hash table */
         spin_lock_irqsave(&adapter->req_list_lock, flags);
         idx = zfcp_reqlist_hash(req->req_id);
         list_add_tail(&req->list, &adapter->req_list[idx]);
         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 
         req->qdio_outb_usage = atomic_read(&adapter->req_q.count);
         req->issued = get_clock();
         if (zfcp_qdio_send(req)) {
                 del_timer(&req->timer);
                 spin_lock_irqsave(&adapter->req_list_lock, flags);
                 /* lookup request again, list might have changed */
                 if (zfcp_reqlist_find_safe(adapter, req))
                         zfcp_reqlist_remove(adapter, req);
                 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
                 zfcp_erp_adapter_reopen(adapter, 0, 116, req);
                 return -EIO;
         }
 
         /* Don't increase for unsolicited status */
         if (req->qtcb)
                 adapter->fsf_req_seq_no++;
 
         return 0;
 }
 
 /**
  * zfcp_fsf_status_read - send status read request
  * @adapter: pointer to struct zfcp_adapter
  * @req_flags: request flags
  * Returns: 0 on success, ERROR otherwise
  */
 int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
 {
         struct zfcp_fsf_req *req;
         struct fsf_status_read_buffer *sr_buf;
         struct qdio_buffer_element *sbale;
         int retval = -EIO;
 
         spin_lock_bh(&adapter->req_q_lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
                                   ZFCP_REQ_NO_QTCB,
                                   adapter->pool.fsf_req_status_read);
         if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
 
         sbale = zfcp_qdio_sbale_req(req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
         req->sbale_curr = 2;
 
         sr_buf = mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
         if (!sr_buf) {
                 retval = -ENOMEM;
                 goto failed_buf;
         }
         memset(sr_buf, 0, sizeof(*sr_buf));
         req->data = sr_buf;
         sbale = zfcp_qdio_sbale_curr(req);
         sbale->addr = (void *) sr_buf;
         sbale->length = sizeof(*sr_buf);
 
         retval = zfcp_fsf_req_send(req);
         if (retval)
                 goto failed_req_send;
 
         goto out;
 
 failed_req_send:
         mempool_free(sr_buf, adapter->pool.data_status_read);
 failed_buf:
         zfcp_fsf_req_free(req);
         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 out:
         spin_unlock_bh(&adapter->req_q_lock);
         return retval;
 }
 
 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 {
         struct zfcp_unit *unit = req->data;
         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 
         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                 return;
 
         switch (req->qtcb->header.fsf_status) {
         case FSF_PORT_HANDLE_NOT_VALID:
                 if (fsq->word[0] == fsq->word[1]) {
                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
                                                 req);
                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                 }
                 break;
         case FSF_LUN_HANDLE_NOT_VALID:
                 if (fsq->word[0] == fsq->word[1]) {
                         zfcp_erp_port_reopen(unit->port, 0, 105, req);
                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                 }
                 break;
         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
                 break;
         case FSF_PORT_BOXED:
                 zfcp_erp_port_boxed(unit->port, 47, req);
                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                                ZFCP_STATUS_FSFREQ_RETRY;
                 break;
         case FSF_LUN_BOXED:
                 zfcp_erp_unit_boxed(unit, 48, req);
                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                                ZFCP_STATUS_FSFREQ_RETRY;
                 break;
         case FSF_ADAPTER_STATUS_AVAILABLE:
                 switch (fsq->word[0]) {
                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                         zfcp_test_link(unit->port);
                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                         break;
                 }
                 break;
         case FSF_GOOD:
                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
                 break;
         }
 }
 
 /**
  * zfcp_fsf_abort_fcp_command - abort running SCSI command
  * @old_req_id: unsigned long
  * @adapter: pointer to struct zfcp_adapter
  * @unit: pointer to struct zfcp_unit
  * @req_flags: integer specifying the request flags
  * Returns: pointer to struct zfcp_fsf_req
  *
  * FIXME(design): should be watched by a timeout !!!
  */
 
 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
                                                 struct zfcp_adapter *adapter,
                                                 struct zfcp_unit *unit,
                                                 int req_flags)
 {
         struct qdio_buffer_element *sbale;
         struct zfcp_fsf_req *req = NULL;
 
         spin_lock(&adapter->req_q_lock);
         if (!zfcp_fsf_sbal_available(adapter))
                 goto out;
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
                                   req_flags, adapter->pool.fsf_req_abort);
         if (IS_ERR(req)) {
                 req = NULL;
                 goto out;
         }
 
         if (unlikely(!(atomic_read(&unit->status) &
                        ZFCP_STATUS_COMMON_UNBLOCKED)))
                 goto out_error_free;
 
         sbale = zfcp_qdio_sbale_req(req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
         req->data = unit;
         req->handler = zfcp_fsf_abort_fcp_command_handler;
         req->qtcb->header.lun_handle = unit->handle;
         req->qtcb->header.port_handle = unit->port->handle;
         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 
         zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
         if (!zfcp_fsf_req_send(req))
                 goto out;
 
 out_error_free:
         zfcp_fsf_req_free(req);
         req = NULL;
 out:
         spin_unlock(&adapter->req_q_lock);
         return req;
 }
 
 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
 {
         struct zfcp_adapter *adapter = req->adapter;
         struct zfcp_send_ct *send_ct = req->data;
         struct fsf_qtcb_header *header = &req->qtcb->header;
 
         send_ct->status = -EINVAL;
 
         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                 goto skip_fsfstatus;
 
         switch (header->fsf_status) {
         case FSF_GOOD:
                 zfcp_san_dbf_event_ct_response(req);
                 send_ct->status = 0;
                 break;
         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
                 zfcp_fsf_class_not_supp(req);
                 break;
         case FSF_ADAPTER_STATUS_AVAILABLE:
                 switch (header->fsf_status_qual.word[0]){
                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                         break;
                 }
                 break;
         case FSF_ACCESS_DENIED:
                 break;
         case FSF_PORT_BOXED:
                 req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                                ZFCP_STATUS_FSFREQ_RETRY;
                 break;
         case FSF_PORT_HANDLE_NOT_VALID:
                 zfcp_erp_adapter_reopen(adapter, 0, 106, req);
         case FSF_GENERIC_COMMAND_REJECTED:
        case FSF_PAYLOAD_SIZE_MISMATCH:
        case FSF_REQUEST_SIZE_TOO_LARGE:
        case FSF_RESPONSE_SIZE_TOO_LARGE:
        case FSF_SBAL_MISMATCH:
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        }

skip_fsfstatus:
        if (send_ct->handler)
                send_ct->handler(send_ct->handler_data);
}

static int zfcp_fsf_setup_sbals(struct zfcp_fsf_req *req,
                                struct scatterlist *sg_req,
                                struct scatterlist *sg_resp, int max_sbals)
{
        int bytes;

        bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
                                        sg_req, max_sbals);
        if (bytes <= 0)
                return -ENOMEM;
        req->qtcb->bottom.support.req_buf_length = bytes;
        req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;

        bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
                                        sg_resp, max_sbals);
        if (bytes <= 0)
                return -ENOMEM;
        req->qtcb->bottom.support.resp_buf_length = bytes;

        return 0;
}

/**
 * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
 * @ct: pointer to struct zfcp_send_ct with data for request
 * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
 * @erp_action: if non-null the Generic Service request sent within ERP
 */
int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
                     struct zfcp_erp_action *erp_action)
{
        struct zfcp_wka_port *wka_port = ct->wka_port;
        struct zfcp_adapter *adapter = wka_port->adapter;
        struct zfcp_fsf_req *req;
        int ret = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
                                  ZFCP_REQ_AUTO_CLEANUP, pool);
        if (IS_ERR(req)) {
                ret = PTR_ERR(req);
                goto out;
        }

        ret = zfcp_fsf_setup_sbals(req, ct->req, ct->resp,
                                   FSF_MAX_SBALS_PER_REQ);
        if (ret)
                goto failed_send;

        req->handler = zfcp_fsf_send_ct_handler;
        req->qtcb->header.port_handle = wka_port->handle;
        req->qtcb->bottom.support.service_class = FSF_CLASS_3;
        req->qtcb->bottom.support.timeout = ct->timeout;
        req->data = ct;

        zfcp_san_dbf_event_ct_request(req);

        if (erp_action) {
                erp_action->fsf_req = req;
                req->erp_action = erp_action;
                zfcp_fsf_start_erp_timer(req);
        } else
                zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);

        ret = zfcp_fsf_req_send(req);
        if (ret)
                goto failed_send;

        goto out;

failed_send:
        zfcp_fsf_req_free(req);
        if (erp_action)
                erp_action->fsf_req = NULL;
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return ret;
}

static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_send_els *send_els = req->data;
        struct zfcp_port *port = send_els->port;
        struct fsf_qtcb_header *header = &req->qtcb->header;

        send_els->status = -EINVAL;

        if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                goto skip_fsfstatus;

        switch (header->fsf_status) {
        case FSF_GOOD:
                zfcp_san_dbf_event_els_response(req);
                send_els->status = 0;
                break;
        case FSF_SERVICE_CLASS_NOT_SUPPORTED:
                zfcp_fsf_class_not_supp(req);
                break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                switch (header->fsf_status_qual.word[0]){
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        if (port && (send_els->ls_code != ZFCP_LS_ADISC))
                                zfcp_test_link(port);
                        /*fall through */
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                case FSF_SQ_RETRY_IF_POSSIBLE:
                        req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                }
                break;
        case FSF_ELS_COMMAND_REJECTED:
        case FSF_PAYLOAD_SIZE_MISMATCH:
        case FSF_REQUEST_SIZE_TOO_LARGE:
        case FSF_RESPONSE_SIZE_TOO_LARGE:
                break;
        case FSF_ACCESS_DENIED:
                zfcp_fsf_access_denied_port(req, port);
                break;
        case FSF_SBAL_MISMATCH:
                /* should never occure, avoided in zfcp_fsf_send_els */
                /* fall through */
        default:
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        }
skip_fsfstatus:
        if (send_els->handler)
                send_els->handler(send_els->handler_data);
}

/**
 * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
 * @els: pointer to struct zfcp_send_els with data for the command
 */
int zfcp_fsf_send_els(struct zfcp_send_els *els)
{
        struct zfcp_fsf_req *req;
        struct zfcp_adapter *adapter = els->adapter;
        struct fsf_qtcb_bottom_support *bottom;
        int ret = -EIO;

        if (unlikely(!(atomic_read(&els->port->status) &
                       ZFCP_STATUS_COMMON_UNBLOCKED)))
                return -EBUSY;

        spin_lock(&adapter->req_q_lock);
        if (!zfcp_fsf_sbal_available(adapter))
                goto out;
        req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
                                  ZFCP_REQ_AUTO_CLEANUP, NULL);
        if (IS_ERR(req)) {
                ret = PTR_ERR(req);
                goto out;
        }

        ret = zfcp_fsf_setup_sbals(req, els->req, els->resp, 2);

        if (ret)
                goto failed_send;

        bottom = &req->qtcb->bottom.support;
        req->handler = zfcp_fsf_send_els_handler;
        bottom->d_id = els->d_id;
        bottom->service_class = FSF_CLASS_3;
        bottom->timeout = 2 * R_A_TOV;
        req->data = els;

        zfcp_san_dbf_event_els_request(req);

        zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
        ret = zfcp_fsf_req_send(req);
        if (ret)
                goto failed_send;

        goto out;

failed_send:
        zfcp_fsf_req_free(req);
out:
        spin_unlock(&adapter->req_q_lock);
        return ret;
}

int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_fsf_req *req;
        struct zfcp_adapter *adapter = erp_action->adapter;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (!zfcp_fsf_sbal_available(adapter))
                goto out;
        req = zfcp_fsf_req_create(adapter,
                                  FSF_QTCB_EXCHANGE_CONFIG_DATA,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->qtcb->bottom.config.feature_selection =
                        FSF_FEATURE_CFDC |
                        FSF_FEATURE_LUN_SHARING |
                        FSF_FEATURE_NOTIFICATION_LOST |
                        FSF_FEATURE_UPDATE_ALERT;
        req->erp_action = erp_action;
        req->handler = zfcp_fsf_exchange_config_data_handler;
        erp_action->fsf_req = req;

        zfcp_fsf_start_erp_timer(req);
        retval = zfcp_fsf_req_send(req);
        if (retval) {
                zfcp_fsf_req_free(req);
                erp_action->fsf_req = NULL;
        }
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
                                       struct fsf_qtcb_bottom_config *data)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_fsf_req *req = NULL;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
                                  0, NULL);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
        req->handler = zfcp_fsf_exchange_config_data_handler;

        req->qtcb->bottom.config.feature_selection =
                        FSF_FEATURE_CFDC |
                        FSF_FEATURE_LUN_SHARING |
                        FSF_FEATURE_NOTIFICATION_LOST |
                        FSF_FEATURE_UPDATE_ALERT;

        if (data)
                req->data = data;

        zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
        retval = zfcp_fsf_req_send(req);
out:
        spin_unlock_bh(&adapter->req_q_lock);
        if (!retval)
                wait_event(req->completion_wq,
                           req->status & ZFCP_STATUS_FSFREQ_COMPLETED);

        zfcp_fsf_req_free(req);

        return retval;
}

/**
 * zfcp_fsf_exchange_port_data - request information about local port
 * @erp_action: ERP action for the adapter for which port data is requested
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_fsf_req *req;
        struct zfcp_adapter *adapter = erp_action->adapter;
        int retval = -EIO;

        if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
                return -EOPNOTSUPP;

        spin_lock_bh(&adapter->req_q_lock);
        if (!zfcp_fsf_sbal_available(adapter))
                goto out;
        req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->handler = zfcp_fsf_exchange_port_data_handler;
        req->erp_action = erp_action;
        erp_action->fsf_req = req;

        zfcp_fsf_start_erp_timer(req);
        retval = zfcp_fsf_req_send(req);
        if (retval) {
                zfcp_fsf_req_free(req);
                erp_action->fsf_req = NULL;
        }
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

/**
 * zfcp_fsf_exchange_port_data_sync - request information about local port
 * @adapter: pointer to struct zfcp_adapter
 * @data: pointer to struct fsf_qtcb_bottom_port
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
                                     struct fsf_qtcb_bottom_port *data)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_fsf_req *req = NULL;
        int retval = -EIO;

        if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
                return -EOPNOTSUPP;

        spin_lock_bh(&adapter->req_q_lock);
        if (!zfcp_fsf_sbal_available(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
                                  NULL);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        if (data)
                req->data = data;

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->handler = zfcp_fsf_exchange_port_data_handler;
        zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
        retval = zfcp_fsf_req_send(req);
out:
        spin_unlock_bh(&adapter->req_q_lock);
        if (!retval)
                wait_event(req->completion_wq,
                           req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
        zfcp_fsf_req_free(req);

        return retval;
}

static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_port *port = req->data;
        struct fsf_qtcb_header *header = &req->qtcb->header;
        struct fsf_plogi *plogi;

        if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                return;

        switch (header->fsf_status) {
        case FSF_PORT_ALREADY_OPEN:
                break;
        case FSF_ACCESS_DENIED:
                zfcp_fsf_access_denied_port(req, port);
                break;
        case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
                dev_warn(&req->adapter->ccw_device->dev,
                         "Not enough FCP adapter resources to open "
                         "remote port 0x%016Lx\n",
                         (unsigned long long)port->wwpn);
                zfcp_erp_port_failed(port, 31, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                case FSF_SQ_NO_RETRY_POSSIBLE:
                        dev_warn(&req->adapter->ccw_device->dev,
                                 "Remote port 0x%016Lx could not be opened\n",
                                 (unsigned long long)port->wwpn);
                        zfcp_erp_port_failed(port, 32, req);
                        req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                }
                break;
        case FSF_GOOD:
                port->handle = header->port_handle;
                atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
                                ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
                atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
                                  ZFCP_STATUS_COMMON_ACCESS_BOXED,
                                  &port->status);
                /* check whether D_ID has changed during open */
                /*
                 * FIXME: This check is not airtight, as the FCP channel does
                 * not monitor closures of target port connections caused on
                 * the remote side. Thus, they might miss out on invalidating
                 * locally cached WWPNs (and other N_Port parameters) of gone
                 * target ports. So, our heroic attempt to make things safe
                 * could be undermined by 'open port' response data tagged with
                 * obsolete WWPNs. Another reason to monitor potential
                 * connection closures ourself at least (by interpreting
                 * incoming ELS' and unsolicited status). It just crosses my
                 * mind that one should be able to cross-check by means of
                 * another GID_PN straight after a port has been opened.
                 * Alternately, an ADISC/PDISC ELS should suffice, as well.
                 */
                plogi = (struct fsf_plogi *) req->qtcb->bottom.support.els;
                if (req->qtcb->bottom.support.els1_length >= sizeof(*plogi)) {
                        if (plogi->serv_param.wwpn != port->wwpn)
                                atomic_clear_mask(ZFCP_STATUS_PORT_DID_DID,
                                                  &port->status);
                        else {
                                port->wwnn = plogi->serv_param.wwnn;
                                zfcp_fc_plogi_evaluate(port, plogi);
                        }
                }
                break;
        case FSF_UNKNOWN_OP_SUBTYPE:
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        }
}

/**
 * zfcp_fsf_open_port - create and send open port request
 * @erp_action: pointer to struct zfcp_erp_action
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = erp_action->adapter;
        struct zfcp_fsf_req *req;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter,
                                  FSF_QTCB_OPEN_PORT_WITH_DID,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->handler = zfcp_fsf_open_port_handler;
        req->qtcb->bottom.support.d_id = erp_action->port->d_id;
        req->data = erp_action->port;
        req->erp_action = erp_action;
        erp_action->fsf_req = req;

        zfcp_fsf_start_erp_timer(req);
        retval = zfcp_fsf_req_send(req);
        if (retval) {
                zfcp_fsf_req_free(req);
                erp_action->fsf_req = NULL;
        }
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_port *port = req->data;

        if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                return;

        switch (req->qtcb->header.fsf_status) {
        case FSF_PORT_HANDLE_NOT_VALID:
                zfcp_erp_adapter_reopen(port->adapter, 0, 107, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                break;
        case FSF_GOOD:
                zfcp_erp_modify_port_status(port, 33, req,
                                            ZFCP_STATUS_COMMON_OPEN,
                                            ZFCP_CLEAR);
                break;
        }
}

/**
 * zfcp_fsf_close_port - create and send close port request
 * @erp_action: pointer to struct zfcp_erp_action
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = erp_action->adapter;
        struct zfcp_fsf_req *req;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->handler = zfcp_fsf_close_port_handler;
        req->data = erp_action->port;
        req->erp_action = erp_action;
        req->qtcb->header.port_handle = erp_action->port->handle;
        erp_action->fsf_req = req;

        zfcp_fsf_start_erp_timer(req);
        retval = zfcp_fsf_req_send(req);
        if (retval) {
                zfcp_fsf_req_free(req);
                erp_action->fsf_req = NULL;
        }
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_wka_port *wka_port = req->data;
        struct fsf_qtcb_header *header = &req->qtcb->header;

        if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
                wka_port->status = ZFCP_WKA_PORT_OFFLINE;
                goto out;
        }

        switch (header->fsf_status) {
        case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
                dev_warn(&req->adapter->ccw_device->dev,
                         "Opening WKA port 0x%x failed\n", wka_port->d_id);
        case FSF_ADAPTER_STATUS_AVAILABLE:
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
        case FSF_ACCESS_DENIED:
                wka_port->status = ZFCP_WKA_PORT_OFFLINE;
                break;
        case FSF_PORT_ALREADY_OPEN:
                break;
        case FSF_GOOD:
                wka_port->handle = header->port_handle;
                wka_port->status = ZFCP_WKA_PORT_ONLINE;
        }
out:
        wake_up(&wka_port->completion_wq);
}

/**
 * zfcp_fsf_open_wka_port - create and send open wka-port request
 * @wka_port: pointer to struct zfcp_wka_port
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_open_wka_port(struct zfcp_wka_port *wka_port)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = wka_port->adapter;
        struct zfcp_fsf_req *req;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter,
                                  FSF_QTCB_OPEN_PORT_WITH_DID,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (unlikely(IS_ERR(req))) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->handler = zfcp_fsf_open_wka_port_handler;
        req->qtcb->bottom.support.d_id = wka_port->d_id;
        req->data = wka_port;

        zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
        retval = zfcp_fsf_req_send(req);
        if (retval)
                zfcp_fsf_req_free(req);
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_wka_port *wka_port = req->data;

        if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                zfcp_erp_adapter_reopen(wka_port->adapter, 0, 84, req);
        }

        wka_port->status = ZFCP_WKA_PORT_OFFLINE;
        wake_up(&wka_port->completion_wq);
}

/**
 * zfcp_fsf_close_wka_port - create and send close wka port request
 * @erp_action: pointer to struct zfcp_erp_action
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_close_wka_port(struct zfcp_wka_port *wka_port)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = wka_port->adapter;
        struct zfcp_fsf_req *req;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (unlikely(IS_ERR(req))) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->handler = zfcp_fsf_close_wka_port_handler;
        req->data = wka_port;
        req->qtcb->header.port_handle = wka_port->handle;

        zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
        retval = zfcp_fsf_req_send(req);
        if (retval)
                zfcp_fsf_req_free(req);
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_port *port = req->data;
        struct fsf_qtcb_header *header = &req->qtcb->header;
        struct zfcp_unit *unit;

        if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                goto skip_fsfstatus;

        switch (header->fsf_status) {
        case FSF_PORT_HANDLE_NOT_VALID:
                zfcp_erp_adapter_reopen(port->adapter, 0, 108, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_ACCESS_DENIED:
                zfcp_fsf_access_denied_port(req, port);
                break;
        case FSF_PORT_BOXED:
                zfcp_erp_port_boxed(port, 50, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                               ZFCP_STATUS_FSFREQ_RETRY;
                /* can't use generic zfcp_erp_modify_port_status because
                 * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
                atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
                list_for_each_entry(unit, &port->unit_list_head, list)
                        atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
                                          &unit->status);
                break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        /* fall through */
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                }
                break;
        case FSF_GOOD:
                /* can't use generic zfcp_erp_modify_port_status because
                 * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
                 */
                atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
                list_for_each_entry(unit, &port->unit_list_head, list)
                        atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
                                          &unit->status);
                break;
        }
skip_fsfstatus:
        atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
}

/**
 * zfcp_fsf_close_physical_port - close physical port
 * @erp_action: pointer to struct zfcp_erp_action
 * Returns: 0 on success
 */
int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = erp_action->adapter;
        struct zfcp_fsf_req *req;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->data = erp_action->port;
        req->qtcb->header.port_handle = erp_action->port->handle;
        req->erp_action = erp_action;
        req->handler = zfcp_fsf_close_physical_port_handler;
        erp_action->fsf_req = req;
        atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
                        &erp_action->port->status);

        zfcp_fsf_start_erp_timer(req);
        retval = zfcp_fsf_req_send(req);
        if (retval) {
                zfcp_fsf_req_free(req);
                erp_action->fsf_req = NULL;
        }
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_adapter *adapter = req->adapter;
        struct zfcp_unit *unit = req->data;
        struct fsf_qtcb_header *header = &req->qtcb->header;
        struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
        struct fsf_queue_designator *queue_designator =
                                &header->fsf_status_qual.fsf_queue_designator;
        int exclusive, readwrite;

        if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                return;

        atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
                          ZFCP_STATUS_COMMON_ACCESS_BOXED |
                          ZFCP_STATUS_UNIT_SHARED |
                          ZFCP_STATUS_UNIT_READONLY,
                          &unit->status);

        switch (header->fsf_status) {

        case FSF_PORT_HANDLE_NOT_VALID:
                zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, req);
                /* fall through */
        case FSF_LUN_ALREADY_OPEN:
                break;
        case FSF_ACCESS_DENIED:
                zfcp_fsf_access_denied_unit(req, unit);
                atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
                atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
                break;
        case FSF_PORT_BOXED:
                zfcp_erp_port_boxed(unit->port, 51, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                               ZFCP_STATUS_FSFREQ_RETRY;
                break;
        case FSF_LUN_SHARING_VIOLATION:
                if (header->fsf_status_qual.word[0])
                        dev_warn(&adapter->ccw_device->dev,
                                 "LUN 0x%Lx on port 0x%Lx is already in "
                                 "use by CSS%d, MIF Image ID %x\n",
                                 (unsigned long long)unit->fcp_lun,
                                 (unsigned long long)unit->port->wwpn,
                                 queue_designator->cssid,
                                 queue_designator->hla);
                else
                        zfcp_act_eval_err(adapter,
                                          header->fsf_status_qual.word[2]);
                zfcp_erp_unit_access_denied(unit, 60, req);
                atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
                atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
                dev_warn(&adapter->ccw_device->dev,
                         "No handle is available for LUN "
                         "0x%016Lx on port 0x%016Lx\n",
                         (unsigned long long)unit->fcp_lun,
                         (unsigned long long)unit->port->wwpn);
                zfcp_erp_unit_failed(unit, 34, req);
                /* fall through */
        case FSF_INVALID_COMMAND_OPTION:
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        zfcp_test_link(unit->port);
                        /* fall through */
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                }
                break;

        case FSF_GOOD:
                unit->handle = header->lun_handle;
                atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);

                if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
                    (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
                    (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
                        exclusive = (bottom->lun_access_info &
                                        FSF_UNIT_ACCESS_EXCLUSIVE);
                        readwrite = (bottom->lun_access_info &
                                        FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);

                        if (!exclusive)
                                atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
                                                &unit->status);

                        if (!readwrite) {
                                atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
                                                &unit->status);
                                dev_info(&adapter->ccw_device->dev,
                                         "SCSI device at LUN 0x%016Lx on port "
                                         "0x%016Lx opened read-only\n",
                                         (unsigned long long)unit->fcp_lun,
                                         (unsigned long long)unit->port->wwpn);
                        }

                        if (exclusive && !readwrite) {
                                dev_err(&adapter->ccw_device->dev,
                                        "Exclusive read-only access not "
                                        "supported (unit 0x%016Lx, "
                                        "port 0x%016Lx)\n",
                                        (unsigned long long)unit->fcp_lun,
                                        (unsigned long long)unit->port->wwpn);
                                zfcp_erp_unit_failed(unit, 35, req);
                                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                                zfcp_erp_unit_shutdown(unit, 0, 80, req);
                        } else if (!exclusive && readwrite) {
                                dev_err(&adapter->ccw_device->dev,
                                        "Shared read-write access not "
                                        "supported (unit 0x%016Lx, port "
                                        "0x%016Lx\n)",
                                        (unsigned long long)unit->fcp_lun,
                                        (unsigned long long)unit->port->wwpn);
                                zfcp_erp_unit_failed(unit, 36, req);
                                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                                zfcp_erp_unit_shutdown(unit, 0, 81, req);
                        }
                }
                break;
        }
}

/**
 * zfcp_fsf_open_unit - open unit
 * @erp_action: pointer to struct zfcp_erp_action
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = erp_action->adapter;
        struct zfcp_fsf_req *req;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->qtcb->header.port_handle = erp_action->port->handle;
        req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
        req->handler = zfcp_fsf_open_unit_handler;
        req->data = erp_action->unit;
        req->erp_action = erp_action;
        erp_action->fsf_req = req;

        if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
                req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;

        zfcp_fsf_start_erp_timer(req);
        retval = zfcp_fsf_req_send(req);
        if (retval) {
                zfcp_fsf_req_free(req);
                erp_action->fsf_req = NULL;
        }
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_unit *unit = req->data;

        if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
                return;

        switch (req->qtcb->header.fsf_status) {
        case FSF_PORT_HANDLE_NOT_VALID:
                zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_LUN_HANDLE_NOT_VALID:
                zfcp_erp_port_reopen(unit->port, 0, 111, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_PORT_BOXED:
                zfcp_erp_port_boxed(unit->port, 52, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                               ZFCP_STATUS_FSFREQ_RETRY;
                break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                switch (req->qtcb->header.fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        zfcp_test_link(unit->port);
                        /* fall through */
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                }
                break;
        case FSF_GOOD:
                atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
                break;
        }
}

/**
 * zfcp_fsf_close_unit - close zfcp unit
 * @erp_action: pointer to struct zfcp_unit
 * Returns: 0 on success, error otherwise
 */
int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = erp_action->adapter;
        struct zfcp_fsf_req *req;
        int retval = -EIO;

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;
        req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
                                  ZFCP_REQ_AUTO_CLEANUP,
                                  adapter->pool.fsf_req_erp);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        req->qtcb->header.port_handle = erp_action->port->handle;
        req->qtcb->header.lun_handle = erp_action->unit->handle;
        req->handler = zfcp_fsf_close_unit_handler;
        req->data = erp_action->unit;
        req->erp_action = erp_action;
        erp_action->fsf_req = req;

        zfcp_fsf_start_erp_timer(req);
        retval = zfcp_fsf_req_send(req);
        if (retval) {
                zfcp_fsf_req_free(req);
                erp_action->fsf_req = NULL;
        }
out:
        spin_unlock_bh(&adapter->req_q_lock);
        return retval;
}

static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
{
        lat_rec->sum += lat;
        lat_rec->min = min(lat_rec->min, lat);
        lat_rec->max = max(lat_rec->max, lat);
}

static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
{
        struct fsf_qual_latency_info *lat_inf;
        struct latency_cont *lat;
        struct zfcp_unit *unit = req->unit;
        unsigned long flags;

        lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;

        switch (req->qtcb->bottom.io.data_direction) {
        case FSF_DATADIR_READ:
                lat = &unit->latencies.read;
                break;
        case FSF_DATADIR_WRITE:
                lat = &unit->latencies.write;
                break;
        case FSF_DATADIR_CMND:
                lat = &unit->latencies.cmd;
                break;
        default:
                return;
        }

        spin_lock_irqsave(&unit->latencies.lock, flags);
        zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
        zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
        lat->counter++;
        spin_unlock_irqrestore(&unit->latencies.lock, flags);
}

#ifdef CONFIG_BLK_DEV_IO_TRACE
static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
{
        struct fsf_qual_latency_info *lat_inf;
        struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
        struct request *req = scsi_cmnd->request;
        struct zfcp_blk_drv_data trace;
        int ticks = fsf_req->adapter->timer_ticks;

        trace.flags = 0;
        trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
        if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
                trace.flags |= ZFCP_BLK_LAT_VALID;
                lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
                trace.channel_lat = lat_inf->channel_lat * ticks;
                trace.fabric_lat = lat_inf->fabric_lat * ticks;
        }
        if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
                trace.flags |= ZFCP_BLK_REQ_ERROR;
        trace.inb_usage = fsf_req->qdio_inb_usage;
        trace.outb_usage = fsf_req->qdio_outb_usage;

        blk_add_driver_data(req->q, req, &trace, sizeof(trace));
}
#else
static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
{
}
#endif

static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
{
        struct scsi_cmnd *scpnt;
        struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
            &(req->qtcb->bottom.io.fcp_rsp);
        u32 sns_len;
        char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
        unsigned long flags;

        read_lock_irqsave(&req->adapter->abort_lock, flags);

        scpnt = req->data;
        if (unlikely(!scpnt)) {
                read_unlock_irqrestore(&req->adapter->abort_lock, flags);
                return;
        }

        if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
                set_host_byte(scpnt, DID_SOFT_ERROR);
                set_driver_byte(scpnt, SUGGEST_RETRY);
                goto skip_fsfstatus;
        }

        if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
                set_host_byte(scpnt, DID_ERROR);
                goto skip_fsfstatus;
        }

        set_msg_byte(scpnt, COMMAND_COMPLETE);

        scpnt->result |= fcp_rsp_iu->scsi_status;

        if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
                zfcp_fsf_req_latency(req);

        zfcp_fsf_trace_latency(req);

        if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
                if (fcp_rsp_info[3] == RSP_CODE_GOOD)
                        set_host_byte(scpnt, DID_OK);
                else {
                        set_host_byte(scpnt, DID_ERROR);
                        goto skip_fsfstatus;
                }
        }

        if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
                sns_len = FSF_FCP_RSP_SIZE - sizeof(struct fcp_rsp_iu) +
                          fcp_rsp_iu->fcp_rsp_len;
                sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
                sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);

                memcpy(scpnt->sense_buffer,
                       zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
        }

        if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
                scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
                if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
                    scpnt->underflow)
                        set_host_byte(scpnt, DID_ERROR);
        }
skip_fsfstatus:
        if (scpnt->result != 0)
                zfcp_scsi_dbf_event_result("erro", 3, req->adapter, scpnt, req);
        else if (scpnt->retries > 0)
                zfcp_scsi_dbf_event_result("retr", 4, req->adapter, scpnt, req);
        else
                zfcp_scsi_dbf_event_result("norm", 6, req->adapter, scpnt, req);

        scpnt->host_scribble = NULL;
        (scpnt->scsi_done) (scpnt);
        /*
         * We must hold this lock until scsi_done has been called.
         * Otherwise we may call scsi_done after abort regarding this
         * command has completed.
         * Note: scsi_done must not block!
         */
        read_unlock_irqrestore(&req->adapter->abort_lock, flags);
}

static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
{
        struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
            &(req->qtcb->bottom.io.fcp_rsp);
        char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];

        if ((fcp_rsp_info[3] != RSP_CODE_GOOD) ||
             (req->status & ZFCP_STATUS_FSFREQ_ERROR))
                req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
}


static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
{
        struct zfcp_unit *unit;
        struct fsf_qtcb_header *header = &req->qtcb->header;

        if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
                unit = req->data;
        else
                unit = req->unit;

        if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
                goto skip_fsfstatus;

        switch (header->fsf_status) {
        case FSF_HANDLE_MISMATCH:
        case FSF_PORT_HANDLE_NOT_VALID:
                zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_FCPLUN_NOT_VALID:
        case FSF_LUN_HANDLE_NOT_VALID:
                zfcp_erp_port_reopen(unit->port, 0, 113, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_SERVICE_CLASS_NOT_SUPPORTED:
                zfcp_fsf_class_not_supp(req);
                break;
        case FSF_ACCESS_DENIED:
                zfcp_fsf_access_denied_unit(req, unit);
                break;
        case FSF_DIRECTION_INDICATOR_NOT_VALID:
                dev_err(&req->adapter->ccw_device->dev,
                        "Incorrect direction %d, unit 0x%016Lx on port "
                        "0x%016Lx closed\n",
                        req->qtcb->bottom.io.data_direction,
                        (unsigned long long)unit->fcp_lun,
                        (unsigned long long)unit->port->wwpn);
                zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_CMND_LENGTH_NOT_VALID:
                dev_err(&req->adapter->ccw_device->dev,
                        "Incorrect CDB length %d, unit 0x%016Lx on "
                        "port 0x%016Lx closed\n",
                        req->qtcb->bottom.io.fcp_cmnd_length,
                        (unsigned long long)unit->fcp_lun,
                        (unsigned long long)unit->port->wwpn);
                zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        case FSF_PORT_BOXED:
                zfcp_erp_port_boxed(unit->port, 53, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                               ZFCP_STATUS_FSFREQ_RETRY;
                break;
        case FSF_LUN_BOXED:
                zfcp_erp_unit_boxed(unit, 54, req);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR |
                               ZFCP_STATUS_FSFREQ_RETRY;
                break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                if (header->fsf_status_qual.word[0] ==
                    FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
                        zfcp_test_link(unit->port);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
        }
skip_fsfstatus:
        if (req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
                zfcp_fsf_send_fcp_ctm_handler(req);
        else {
                zfcp_fsf_send_fcp_command_task_handler(req);
                req->unit = NULL;
                zfcp_unit_put(unit);
        }
}

static void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, u32 fcp_dl)
{
        u32 *fcp_dl_ptr;

        /*
         * fcp_dl_addr = start address of fcp_cmnd structure +
         * size of fixed part + size of dynamically sized add_dcp_cdb field
         * SEE FCP-2 documentation
         */
        fcp_dl_ptr = (u32 *) ((unsigned char *) &fcp_cmd[1] +
                        (fcp_cmd->add_fcp_cdb_length << 2));
        *fcp_dl_ptr = fcp_dl;
}

/**
 * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
 * @adapter: adapter where scsi command is issued
 * @unit: unit where command is sent to
 * @scsi_cmnd: scsi command to be sent
 * @timer: timer to be started when request is initiated
 * @req_flags: flags for fsf_request
 */
int zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
                                   struct zfcp_unit *unit,
                                   struct scsi_cmnd *scsi_cmnd,
                                   int use_timer, int req_flags)
{
        struct zfcp_fsf_req *req;
        struct fcp_cmnd_iu *fcp_cmnd_iu;
        unsigned int sbtype;
        int real_bytes, retval = -EIO;

        if (unlikely(!(atomic_read(&unit->status) &
                       ZFCP_STATUS_COMMON_UNBLOCKED)))
                return -EBUSY;

        spin_lock(&adapter->req_q_lock);
        if (!zfcp_fsf_sbal_available(adapter))
                goto out;
        req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
                                  adapter->pool.fsf_req_scsi);
        if (IS_ERR(req)) {
                retval = PTR_ERR(req);
                goto out;
        }

        zfcp_unit_get(unit);
        req->unit = unit;
        req->data = scsi_cmnd;
        req->handler = zfcp_fsf_send_fcp_command_handler;
        req->qtcb->header.lun_handle = unit->handle;
        req->qtcb->header.port_handle = unit->port->handle;
        req->qtcb->bottom.io.service_class = FSF_CLASS_3;

        scsi_cmnd->host_scribble = (unsigned char *) req->req_id;

        fcp_cmnd_iu = (struct fcp_cmnd_iu *) &(req->qtcb->bottom.io.fcp_cmnd);
        fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
        /*
         * set depending on data direction:
         *      data direction bits in SBALE (SB Type)
         *      data direction bits in QTCB
         *      data direction bits in FCP_CMND IU
         */
        switch (scsi_cmnd->sc_data_direction) {
        case DMA_NONE:
                req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
                sbtype = SBAL_FLAGS0_TYPE_READ;
                break;
        case DMA_FROM_DEVICE:
                req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
                sbtype = SBAL_FLAGS0_TYPE_READ;
                fcp_cmnd_iu->rddata = 1;
                break;
        case DMA_TO_DEVICE:
                req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
                sbtype = SBAL_FLAGS0_TYPE_WRITE;
                fcp_cmnd_iu->wddata = 1;
                break;
        case DMA_BIDIRECTIONAL:
        default:
                retval = -EIO;
                goto failed_scsi_cmnd;
        }

        if (likely((scsi_cmnd->device->simple_tags) ||
                   ((atomic_read(&unit->status) & ZFCP_STATUS_UNIT_READONLY) &&
                    (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_SHARED))))
                fcp_cmnd_iu->task_attribute = SIMPLE_Q;
        else
                fcp_cmnd_iu->task_attribute = UNTAGGED;

        if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
                fcp_cmnd_iu->add_fcp_cdb_length =
                        (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;

        memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);

        req->qtcb->bottom.io.fcp_cmnd_length = sizeof(struct fcp_cmnd_iu) +
                fcp_cmnd_iu->add_fcp_cdb_length + sizeof(u32);

        real_bytes = zfcp_qdio_sbals_from_sg(req, sbtype,
                                             scsi_sglist(scsi_cmnd),
                                             FSF_MAX_SBALS_PER_REQ);
        if (unlikely(real_bytes < 0)) {
                if (req->sbal_number < FSF_MAX_SBALS_PER_REQ)
                        retval = -EIO;
                else {
                        dev_err(&adapter->ccw_device->dev,
                                "Oversize data package, unit 0x%016Lx "
                                "on port 0x%016Lx closed\n",
                                (unsigned long long)unit->fcp_lun,
                                (unsigned long long)unit->port->wwpn);
                        zfcp_erp_unit_shutdown(unit, 0, 131, req);
                        retval = -EINVAL;
                }
                goto failed_scsi_cmnd;
        }

        zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);

        if (use_timer)
                zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);

        retval = zfcp_fsf_req_send(req);
        if (unlikely(retval))
                goto failed_scsi_cmnd;

        goto out;

failed_scsi_cmnd:
        zfcp_unit_put(unit);
        zfcp_fsf_req_free(req);
        scsi_cmnd->host_scribble = NULL;
out:
        spin_unlock(&adapter->req_q_lock);
        return retval;
}

/**
 * zfcp_fsf_send_fcp_ctm - send SCSI task management command
 * @adapter: pointer to struct zfcp-adapter
 * @unit: pointer to struct zfcp_unit
 * @tm_flags: unsigned byte for task management flags
 * @req_flags: int request flags
 * Returns: on success pointer to struct fsf_req, NULL otherwise
 */
struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_adapter *adapter,
                                           struct zfcp_unit *unit,
                                           u8 tm_flags, int req_flags)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_fsf_req *req = NULL;
        struct fcp_cmnd_iu *fcp_cmnd_iu;

        if (unlikely(!(atomic_read(&unit->status) &
                       ZFCP_STATUS_COMMON_UNBLOCKED)))
                return NULL;

        spin_lock(&adapter->req_q_lock);
        if (!zfcp_fsf_sbal_available(adapter))
                goto out;
        req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
                                  adapter->pool.fsf_req_scsi);
        if (IS_ERR(req)) {
                req = NULL;
                goto out;
        }

        req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
        req->data = unit;
        req->handler = zfcp_fsf_send_fcp_command_handler;
        req->qtcb->header.lun_handle = unit->handle;
        req->qtcb->header.port_handle = unit->port->handle;
        req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
        req->qtcb->bottom.io.service_class = FSF_CLASS_3;
        req->qtcb->bottom.io.fcp_cmnd_length =         sizeof(struct fcp_cmnd_iu) +
                                                sizeof(u32);

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

        fcp_cmnd_iu = (struct fcp_cmnd_iu *) &req->qtcb->bottom.io.fcp_cmnd;
        fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
        fcp_cmnd_iu->task_management_flags = tm_flags;

        zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
        if (!zfcp_fsf_req_send(req))
                goto out;

        zfcp_fsf_req_free(req);
        req = NULL;
out:
        spin_unlock(&adapter->req_q_lock);
        return req;
}

static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *req)
{
        if (req->qtcb->header.fsf_status != FSF_GOOD)
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}

/**
 * zfcp_fsf_control_file - control file upload/download
 * @adapter: pointer to struct zfcp_adapter
 * @fsf_cfdc: pointer to struct zfcp_fsf_cfdc
 * Returns: on success pointer to struct zfcp_fsf_req, NULL otherwise
 */
struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
                                           struct zfcp_fsf_cfdc *fsf_cfdc)
{
        struct qdio_buffer_element *sbale;
        struct zfcp_fsf_req *req = NULL;
        struct fsf_qtcb_bottom_support *bottom;
        int direction, retval = -EIO, bytes;

        if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
                return ERR_PTR(-EOPNOTSUPP);

        switch (fsf_cfdc->command) {
        case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
                direction = SBAL_FLAGS0_TYPE_WRITE;
                break;
        case FSF_QTCB_UPLOAD_CONTROL_FILE:
                direction = SBAL_FLAGS0_TYPE_READ;
                break;
        default:
                return ERR_PTR(-EINVAL);
        }

        spin_lock_bh(&adapter->req_q_lock);
        if (zfcp_fsf_req_sbal_get(adapter))
                goto out;

        req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
        if (IS_ERR(req)) {
                retval = -EPERM;
                goto out;
        }

        req->handler = zfcp_fsf_control_file_handler;

        sbale = zfcp_qdio_sbale_req(req);
        sbale[0].flags |= direction;

        bottom = &req->qtcb->bottom.support;
        bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
        bottom->option = fsf_cfdc->option;

        bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
                                        FSF_MAX_SBALS_PER_REQ);
        if (bytes != ZFCP_CFDC_MAX_SIZE) {
                retval = -ENOMEM;
                zfcp_fsf_req_free(req);
                goto out;
        }

        zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
        retval = zfcp_fsf_req_send(req);
out:
        spin_unlock_bh(&adapter->req_q_lock);

        if (!retval) {
                wait_event(req->completion_wq,
                           req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
                return req;
        }
        return ERR_PTR(retval);
}