drivers/s390/scsi/zfcp_fsf.c - arm/linux - Git at Google

 /*
  *
  * linux/drivers/s390/scsi/zfcp_fsf.c
  *
  * FCP adapter driver for IBM eServer zSeries
  *
  * (C) Copyright IBM Corp. 2002, 2004
  *
  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  *            Aron Zeh
  *            Wolfgang Taphorn
  *            Stefan Bader <stefan.bader@de.ibm.com>
  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  *            Andreas Herrmann <aherrman@de.ibm.com>
  *            Volker Sameske <sameske@de.ibm.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2, or (at your option)
  * any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #define ZFCP_FSF_C_REVISION "$Revision: 1.92 $"

 #include "zfcp_ext.h"

 static int zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *);
 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_open_port_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_close_port_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_send_fcp_command_task_management_handler(
 	struct zfcp_fsf_req *);
 static int zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_status_read_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *);
 static int zfcp_fsf_control_file_handler(struct zfcp_fsf_req *);
 static inline int zfcp_fsf_req_sbal_check(
 	unsigned long *, struct zfcp_qdio_queue *, int);
 static inline int zfcp_use_one_sbal(
 	struct scatterlist *, int, struct scatterlist *, int);
 static struct zfcp_fsf_req *zfcp_fsf_req_alloc(mempool_t *, int);
 static int zfcp_fsf_req_send(struct zfcp_fsf_req *, struct timer_list *);
 static int zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *);
 static int zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *);
 static int zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *);
 static int zfcp_fsf_req_dispatch(struct zfcp_fsf_req *);
 static void zfcp_fsf_req_dismiss(struct zfcp_fsf_req *);
 static void zfcp_fsf_req_free(struct zfcp_fsf_req *);

 /* 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 const char zfcp_act_subtable_type[5][8] = {
 	"unknown", "OS", "WWPN", "DID", "LUN"
 };

 /****************************************************************/
 /*************** FSF related Functions  *************************/
 /****************************************************************/

 #define ZFCP_LOG_AREA			ZFCP_LOG_AREA_FSF

 /*
  * function:	zfcp_fsf_req_alloc
  *
  * purpose:     Obtains an fsf_req and potentially a qtcb (for all but
  *              unsolicited requests) via helper functions
  *              Does some initial fsf request set-up.
  *
  * returns:	pointer to allocated fsf_req if successfull
  *              NULL otherwise
  *
  * locks:       none
  *
  */
 static struct zfcp_fsf_req *
 zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
 {
 	size_t size;
 	void *ptr;
 	struct zfcp_fsf_req *fsf_req = NULL;

 	if (req_flags & ZFCP_REQ_NO_QTCB)
 		size = sizeof(struct zfcp_fsf_req);
 	else
 		size = sizeof(struct zfcp_fsf_req_pool_element);

 	if (likely(pool != NULL))
 		ptr = mempool_alloc(pool, GFP_ATOMIC);
 	else
 		ptr = kmalloc(size, GFP_ATOMIC);

 	if (unlikely(NULL == ptr))
 		goto out;

 	memset(ptr, 0, size);

 	if (req_flags & ZFCP_REQ_NO_QTCB) {
 		fsf_req = (struct zfcp_fsf_req *) ptr;
 	} else {
 		fsf_req = &((struct zfcp_fsf_req_pool_element *) ptr)->fsf_req;
 		fsf_req->qtcb =
 			&((struct zfcp_fsf_req_pool_element *) ptr)->qtcb;
 	}

 	fsf_req->pool = pool;

  out:
 	return fsf_req;
 }

 /*
  * function:	zfcp_fsf_req_free
  *
  * purpose:     Frees the memory of an fsf_req (and potentially a qtcb) or
  *              returns it into the pool via helper functions.
  *
  * returns:     sod all
  *
  * locks:       none
  */
 static void
 zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
 {
 	if (likely(fsf_req->pool != NULL))
 		mempool_free(fsf_req, fsf_req->pool);
 		else
 			kfree(fsf_req);
 }

 /*
  * function:
  *
  * purpose:
  *
  * returns:
  *
  * note: qdio queues shall be down (no ongoing inbound processing)
  */
 int
 zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 {
 	int retval = 0;
 	struct zfcp_fsf_req *fsf_req, *tmp;

 	list_for_each_entry_safe(fsf_req, tmp, &adapter->fsf_req_list_head,
 				 list)
 	    zfcp_fsf_req_dismiss(fsf_req);
 	/* wait_event_timeout? */
 	while (!list_empty(&adapter->fsf_req_list_head)) {
 		ZFCP_LOG_DEBUG("fsf req list of adapter %s not yet empty\n",
 			       zfcp_get_busid_by_adapter(adapter));
 		/* wait for woken intiators to clean up their requests */
 		msleep(jiffies_to_msecs(ZFCP_FSFREQ_CLEANUP_TIMEOUT));
 	}

 	/* consistency check */
 	if (atomic_read(&adapter->fsf_reqs_active)) {
 		ZFCP_LOG_NORMAL("bug: There are still %d FSF requests pending "
 				"on adapter %s after cleanup.\n",
 				atomic_read(&adapter->fsf_reqs_active),
 				zfcp_get_busid_by_adapter(adapter));
 		atomic_set(&adapter->fsf_reqs_active, 0);
 	}

 	return retval;
 }

 /*
  * function:
  *
  * purpose:
  *
  * returns:
  */
 static void
 zfcp_fsf_req_dismiss(struct zfcp_fsf_req *fsf_req)
 {
 	fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 	zfcp_fsf_req_complete(fsf_req);
 }

 /*
  * function:    zfcp_fsf_req_complete
  *
  * purpose:	Updates active counts and timers for openfcp-reqs
  *              May cleanup request after req_eval returns
  *
  * returns:	0 - success
  *		!0 - failure
  *
  * context:
  */
 int
 zfcp_fsf_req_complete(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = 0;
 	int cleanup;
 	struct zfcp_adapter *adapter = fsf_req->adapter;

 	/* do some statistics */
 	atomic_dec(&adapter->fsf_reqs_active);

 	if (unlikely(fsf_req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 		ZFCP_LOG_DEBUG("Status read response received\n");
 		/*
 		 * Note: all cleanup handling is done in the callchain of
 		 * the function call-chain below.
 		 */
 		zfcp_fsf_status_read_handler(fsf_req);
 		goto out;
 	} else
 		zfcp_fsf_protstatus_eval(fsf_req);

 	/*
 	 * fsf_req may be deleted due to waking up functions, so
 	 * cleanup is saved here and used later
 	 */
 	if (likely(fsf_req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 		cleanup = 1;
 	else
 		cleanup = 0;

 	fsf_req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;

 	/* cleanup request if requested by initiator */
 	if (likely(cleanup)) {
 		ZFCP_LOG_TRACE("removing FSF request %p\n", fsf_req);
 		/*
 		 * lock must not be held here since it will be
 		 * grabed by the called routine, too
 		 */
 		zfcp_fsf_req_cleanup(fsf_req);
 	} else {
 		/* notify initiator waiting for the requests completion */
 		ZFCP_LOG_TRACE("waking initiator of FSF request %p\n",fsf_req);
 		/*
 		 * 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(&fsf_req->completion_wq);
 	}

  out:
 	return retval;
 }

 /*
  * function:    zfcp_fsf_protstatus_eval
  *
  * purpose:	evaluates the QTCB of the finished FSF request
  *		and initiates appropriate actions
  *		(usually calling FSF command specific handlers)
  *
  * returns:
  *
  * context:
  *
  * locks:
  */
 static int
 zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = 0;
 	struct zfcp_adapter *adapter = fsf_req->adapter;

 	ZFCP_LOG_DEBUG("QTCB is at %p\n", fsf_req->qtcb);

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 		ZFCP_LOG_DEBUG("fsf_req 0x%lx has been dismissed\n",
 			       (unsigned long) fsf_req);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 			ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 		zfcp_cmd_dbf_event_fsf("dismiss", fsf_req, NULL, 0);
 		goto skip_protstatus;
 	}

 	/* log additional information provided by FSF (if any) */
 	if (unlikely(fsf_req->qtcb->header.log_length)) {
 		/* do not trust them ;-) */
 		if (fsf_req->qtcb->header.log_start > sizeof(struct fsf_qtcb)) {
 			ZFCP_LOG_NORMAL
 			    ("bug: ULP (FSF logging) log data starts "
 			     "beyond end of packet header. Ignored. "
 			     "(start=%i, size=%li)\n",
 			     fsf_req->qtcb->header.log_start,
 			     sizeof(struct fsf_qtcb));
 			goto forget_log;
 		}
 		if ((size_t) (fsf_req->qtcb->header.log_start +
 		     fsf_req->qtcb->header.log_length)
 		    > sizeof(struct fsf_qtcb)) {
 			ZFCP_LOG_NORMAL("bug: ULP (FSF logging) log data ends "
 					"beyond end of packet header. Ignored. "
 					"(start=%i, length=%i, size=%li)\n",
 					fsf_req->qtcb->header.log_start,
 					fsf_req->qtcb->header.log_length,
 					sizeof(struct fsf_qtcb));
 			goto forget_log;
 		}
 		ZFCP_LOG_TRACE("ULP log data: \n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 			      (char *) fsf_req->qtcb +
 			      fsf_req->qtcb->header.log_start,
 			      fsf_req->qtcb->header.log_length);
 	}
  forget_log:

 	/* evaluate FSF Protocol Status */
 	switch (fsf_req->qtcb->prefix.prot_status) {

 	case FSF_PROT_GOOD:
 	case FSF_PROT_FSF_STATUS_PRESENTED:
 		break;

 	case FSF_PROT_QTCB_VERSION_ERROR:
 		ZFCP_LOG_NORMAL("error: The adapter %s contains "
 				"microcode of version 0x%x, the device driver "
 				"only supports 0x%x. Aborting.\n",
 				zfcp_get_busid_by_adapter(adapter),
 				fsf_req->qtcb->prefix.prot_status_qual.
 				version_error.fsf_version, ZFCP_QTCB_VERSION);
 		/* stop operation for this adapter */
 		debug_text_exception(adapter->erp_dbf, 0, "prot_ver_err");
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		zfcp_cmd_dbf_event_fsf("qverserr", fsf_req,
 				       &fsf_req->qtcb->prefix.prot_status_qual,
 				       sizeof (union fsf_prot_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PROT_SEQ_NUMB_ERROR:
 		ZFCP_LOG_NORMAL("bug: Sequence number mismatch between "
 				"driver (0x%x) and adapter %s (0x%x). "
 				"Restarting all operations on this adapter.\n",
 				fsf_req->qtcb->prefix.req_seq_no,
 				zfcp_get_busid_by_adapter(adapter),
 				fsf_req->qtcb->prefix.prot_status_qual.
 				sequence_error.exp_req_seq_no);
 		debug_text_exception(adapter->erp_dbf, 0, "prot_seq_err");
 		/* restart operation on this adapter */
 		zfcp_erp_adapter_reopen(adapter, 0);
 		zfcp_cmd_dbf_event_fsf("seqnoerr", fsf_req,
 				       &fsf_req->qtcb->prefix.prot_status_qual,
 				       sizeof (union fsf_prot_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PROT_UNSUPP_QTCB_TYPE:
 		ZFCP_LOG_NORMAL("error: Packet header type used by the "
 				"device driver is incompatible with "
 				"that used on adapter %s. "
 				"Stopping all operations on this adapter.\n",
 				zfcp_get_busid_by_adapter(adapter));
 		debug_text_exception(adapter->erp_dbf, 0, "prot_unsup_qtcb");
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		zfcp_cmd_dbf_event_fsf("unsqtcbt", fsf_req,
 				       &fsf_req->qtcb->prefix.prot_status_qual,
 				       sizeof (union fsf_prot_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 		zfcp_cmd_dbf_event_fsf("hconinit", fsf_req,
 				       &fsf_req->qtcb->prefix.prot_status_qual,
 				       sizeof (union fsf_prot_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 				&(adapter->status));
 		debug_text_event(adapter->erp_dbf, 3, "prot_con_init");
 		break;

 	case FSF_PROT_DUPLICATE_REQUEST_ID:
 		if (fsf_req->qtcb) {
 			ZFCP_LOG_NORMAL("bug: The request identifier 0x%Lx "
 					"to the adapter %s is ambiguous. "
 					"Stopping all operations on this "
 					"adapter.\n",
 					*(unsigned long long *)
 					(&fsf_req->qtcb->bottom.support.
 					 req_handle),
 					zfcp_get_busid_by_adapter(adapter));
 		} else {
 			ZFCP_LOG_NORMAL("bug: The request identifier %p "
 					"to the adapter %s is ambiguous. "
 					"Stopping all operations on this "
 					"adapter. "
 					"(bug: got this for an unsolicited "
 					"status read request)\n",
 					fsf_req,
 					zfcp_get_busid_by_adapter(adapter));
 		}
 		debug_text_exception(adapter->erp_dbf, 0, "prot_dup_id");
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		zfcp_cmd_dbf_event_fsf("dupreqid", fsf_req,
 				       &fsf_req->qtcb->prefix.prot_status_qual,
 				       sizeof (union fsf_prot_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PROT_LINK_DOWN:
 		/*
 		 * 'test and set' is not atomic here -
 		 * it's ok as long as calls to our response queue handler
 		 * (and thus execution of this code here) are serialized
 		 * by the qdio module
 		 */
 		if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 				      &adapter->status)) {
 			switch (fsf_req->qtcb->prefix.prot_status_qual.
 				locallink_error.code) {
 			case FSF_PSQ_LINK_NOLIGHT:
 				ZFCP_LOG_INFO("The local link to adapter %s "
 					      "is down (no light detected).\n",
 					      zfcp_get_busid_by_adapter(
 						      adapter));
 				break;
 			case FSF_PSQ_LINK_WRAPPLUG:
 				ZFCP_LOG_INFO("The local link to adapter %s "
 					      "is down (wrap plug detected).\n",
 					      zfcp_get_busid_by_adapter(
 						      adapter));
 				break;
 			case FSF_PSQ_LINK_NOFCP:
 				ZFCP_LOG_INFO("The local link to adapter %s "
 					      "is down (adjacent node on "
 					      "link does not support FCP).\n",
 					      zfcp_get_busid_by_adapter(
 						      adapter));
 				break;
 			default:
 				ZFCP_LOG_INFO("The local link to adapter %s "
 					      "is down "
 					      "(warning: unknown reason "
 					      "code).\n",
 					      zfcp_get_busid_by_adapter(
 						      adapter));
 				break;

 			}
 			/*
 			 * Due to the 'erp failed' flag the adapter won't
 			 * be recovered but will be just set to 'blocked'
 			 * state. All subordinary devices will have state
 			 * 'blocked' and 'erp failed', too.
 			 * Thus the adapter is still able to provide
 			 * 'link up' status without being flooded with
 			 * requests.
 			 * (note: even 'close port' is not permitted)
 			 */
 			ZFCP_LOG_INFO("Stopping all operations for adapter "
 				      "%s.\n",
 				      zfcp_get_busid_by_adapter(adapter));
 			atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 					ZFCP_STATUS_COMMON_ERP_FAILED,
 					&adapter->status);
 			zfcp_erp_adapter_reopen(adapter, 0);
 		}
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PROT_REEST_QUEUE:
 		debug_text_event(adapter->erp_dbf, 1, "prot_reest_queue");
 		ZFCP_LOG_INFO("The local link to adapter with "
 			      "%s was re-plugged. "
 			      "Re-starting operations on this adapter.\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		/* All ports should be marked as ready to run again */
 		zfcp_erp_modify_adapter_status(adapter,
 					       ZFCP_STATUS_COMMON_RUNNING,
 					       ZFCP_SET);
 		zfcp_erp_adapter_reopen(adapter,
 					ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 					| ZFCP_STATUS_COMMON_ERP_FAILED);
 		zfcp_cmd_dbf_event_fsf("reestque", fsf_req,
 				       &fsf_req->qtcb->prefix.prot_status_qual,
 				       sizeof (union fsf_prot_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PROT_ERROR_STATE:
 		ZFCP_LOG_NORMAL("error: The adapter %s "
 				"has entered the error state. "
 				"Restarting all operations on this "
 				"adapter.\n",
 				zfcp_get_busid_by_adapter(adapter));
 		debug_text_event(adapter->erp_dbf, 0, "prot_err_sta");
 		/* restart operation on this adapter */
 		zfcp_erp_adapter_reopen(adapter, 0);
 		zfcp_cmd_dbf_event_fsf("proterrs", fsf_req,
 				       &fsf_req->qtcb->prefix.prot_status_qual,
 				       sizeof (union fsf_prot_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	default:
 		ZFCP_LOG_NORMAL("bug: Transfer protocol status information "
 				"provided by the adapter %s "
 				"is not compatible with the device driver. "
 				"Stopping all operations on this adapter. "
 				"(debug info 0x%x).\n",
 				zfcp_get_busid_by_adapter(adapter),
 				fsf_req->qtcb->prefix.prot_status);
 		debug_text_event(adapter->erp_dbf, 0, "prot_inval:");
 		debug_exception(adapter->erp_dbf, 0,
 				&fsf_req->qtcb->prefix.prot_status,
 				sizeof (u32));
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 	}

  skip_protstatus:
 	/*
 	 * always call specific handlers to give them a chance to do
 	 * something meaningful even in error cases
 	 */
 	zfcp_fsf_fsfstatus_eval(fsf_req);
 	return retval;
 }

 /*
  * function:	zfcp_fsf_fsfstatus_eval
  *
  * purpose:	evaluates FSF status of completed FSF request
  *		and acts accordingly
  *
  * returns:
  */
 static int
 zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = 0;

 	if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 		goto skip_fsfstatus;
 	}

 	/* evaluate FSF Status */
 	switch (fsf_req->qtcb->header.fsf_status) {
 	case FSF_UNKNOWN_COMMAND:
 		ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 				"not known by the adapter %s "
 				"Stopping all operations on this adapter. "
 				"(debug info 0x%x).\n",
 				zfcp_get_busid_by_adapter(fsf_req->adapter),
 				fsf_req->qtcb->header.fsf_command);
 		debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 				     "fsf_s_unknown");
 		zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 		zfcp_cmd_dbf_event_fsf("unknownc", fsf_req,
 				       &fsf_req->qtcb->header.fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_FCP_RSP_AVAILABLE:
 		ZFCP_LOG_DEBUG("FCP Sense data will be presented to the "
 			       "SCSI stack.\n");
 		debug_text_event(fsf_req->adapter->erp_dbf, 3, "fsf_s_rsp");
 		break;

 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_astatus");
 		zfcp_fsf_fsfstatus_qual_eval(fsf_req);
 		break;

 	default:
 		break;
 	}

  skip_fsfstatus:
 	/*
 	 * always call specific handlers to give them a chance to do
 	 * something meaningful even in error cases
 	 */
 	zfcp_fsf_req_dispatch(fsf_req);

 	return retval;
 }

 /*
  * function:	zfcp_fsf_fsfstatus_qual_eval
  *
  * purpose:	evaluates FSF status-qualifier of completed FSF request
  *		and acts accordingly
  *
  * returns:
  */
 static int
 zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = 0;

 	switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 	case FSF_SQ_FCP_RSP_AVAILABLE:
 		debug_text_event(fsf_req->adapter->erp_dbf, 4, "fsf_sq_rsp");
 		break;
 	case FSF_SQ_RETRY_IF_POSSIBLE:
 		/* The SCSI-stack may now issue retries or escalate */
 		debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_sq_retry");
 		zfcp_cmd_dbf_event_fsf("sqretry", fsf_req,
 				       &fsf_req->qtcb->header.fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_SQ_COMMAND_ABORTED:
 		/* Carry the aborted state on to upper layer */
 		debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_sq_abort");
 		zfcp_cmd_dbf_event_fsf("sqabort", fsf_req,
 				       &fsf_req->qtcb->header.fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_SQ_NO_RECOM:
 		debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 				     "fsf_sq_no_rec");
 		ZFCP_LOG_NORMAL("bug: No recommendation could be given for a"
 				"problem on the adapter %s "
 				"Stopping all operations on this adapter. ",
 				zfcp_get_busid_by_adapter(fsf_req->adapter));
 		zfcp_erp_adapter_shutdown(fsf_req->adapter, 0);
 		zfcp_cmd_dbf_event_fsf("sqnrecom", fsf_req,
 				       &fsf_req->qtcb->header.fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_SQ_ULP_PROGRAMMING_ERROR:
 		ZFCP_LOG_NORMAL("error: not enough SBALs for data transfer "
 				"(adapter %s)\n",
 				zfcp_get_busid_by_adapter(fsf_req->adapter));
 		debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 				     "fsf_sq_ulp_err");
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 	case FSF_SQ_NO_RETRY_POSSIBLE:
 	case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 		/* dealt with in the respective functions */
 		break;
 	default:
 		ZFCP_LOG_NORMAL("bug: Additional status info could "
 				"not be interpreted properly.\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 			      (char *) &fsf_req->qtcb->header.fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_sq_inval:");
 		debug_exception(fsf_req->adapter->erp_dbf, 0,
 				&fsf_req->qtcb->header.fsf_status_qual.word[0],
 				sizeof (u32));
 		zfcp_cmd_dbf_event_fsf("squndef", fsf_req,
 				       &fsf_req->qtcb->header.fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	}

 	return retval;
 }

 /*
  * function:	zfcp_fsf_req_dispatch
  *
  * purpose:	calls the appropriate command specific handler
  *
  * returns:
  */
 static int
 zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
 {
 	struct zfcp_erp_action *erp_action = fsf_req->erp_action;
 	struct zfcp_adapter *adapter = fsf_req->adapter;
 	int retval = 0;

 	if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 		ZFCP_LOG_TRACE("fsf_req=%p, QTCB=%p\n", fsf_req, fsf_req->qtcb);
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 			      (char *) fsf_req->qtcb, sizeof(struct fsf_qtcb));
 	}

 	switch (fsf_req->fsf_command) {

 	case FSF_QTCB_FCP_CMND:
 		zfcp_fsf_send_fcp_command_handler(fsf_req);
 		break;

 	case FSF_QTCB_ABORT_FCP_CMND:
 		zfcp_fsf_abort_fcp_command_handler(fsf_req);
 		break;

 	case FSF_QTCB_SEND_GENERIC:
 		zfcp_fsf_send_ct_handler(fsf_req);
 		break;

 	case FSF_QTCB_OPEN_PORT_WITH_DID:
 		zfcp_fsf_open_port_handler(fsf_req);
 		break;

 	case FSF_QTCB_OPEN_LUN:
 		zfcp_fsf_open_unit_handler(fsf_req);
 		break;

 	case FSF_QTCB_CLOSE_LUN:
 		zfcp_fsf_close_unit_handler(fsf_req);
 		break;

 	case FSF_QTCB_CLOSE_PORT:
 		zfcp_fsf_close_port_handler(fsf_req);
 		break;

 	case FSF_QTCB_CLOSE_PHYSICAL_PORT:
 		zfcp_fsf_close_physical_port_handler(fsf_req);
 		break;

 	case FSF_QTCB_EXCHANGE_CONFIG_DATA:
 		zfcp_fsf_exchange_config_data_handler(fsf_req);
 		break;

 	case FSF_QTCB_EXCHANGE_PORT_DATA:
 		zfcp_fsf_exchange_port_data_handler(fsf_req);
 		break;

 	case FSF_QTCB_SEND_ELS:
 		zfcp_fsf_send_els_handler(fsf_req);
 		break;

 	case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 		zfcp_fsf_control_file_handler(fsf_req);
 		break;

 	case FSF_QTCB_UPLOAD_CONTROL_FILE:
 		zfcp_fsf_control_file_handler(fsf_req);
 		break;

 	default:
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 				"not supported by the adapter %s\n",
 				zfcp_get_busid_by_adapter(fsf_req->adapter));
 		if (fsf_req->fsf_command != fsf_req->qtcb->header.fsf_command)
 			ZFCP_LOG_NORMAL
 			    ("bug: Command issued by the device driver differs "
 			     "from the command returned by the adapter %s "
 			     "(debug info 0x%x, 0x%x).\n",
 			     zfcp_get_busid_by_adapter(fsf_req->adapter),
 			     fsf_req->fsf_command,
 			     fsf_req->qtcb->header.fsf_command);
 	}

 	if (!erp_action)
 		return retval;

 	debug_text_event(adapter->erp_dbf, 3, "a_frh");
 	debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
 	zfcp_erp_async_handler(erp_action, 0);

 	return retval;
 }

 /*
  * function:    zfcp_fsf_status_read
  *
  * purpose:	initiates a Status Read command at the specified adapter
  *
  * returns:
  */
 int
 zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
 {
 	struct zfcp_fsf_req *fsf_req;
 	struct fsf_status_read_buffer *status_buffer;
 	unsigned long lock_flags;
 	volatile struct qdio_buffer_element *sbale;
 	int retval = 0;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 				     req_flags | ZFCP_REQ_NO_QTCB,
 				     adapter->pool.fsf_req_status_read,
 				     &lock_flags, &fsf_req);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create unsolicited status "
 			      "buffer for adapter %s.\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		goto failed_req_create;
 	}

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
         fsf_req->sbale_curr = 2;

 	status_buffer =
 		mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 	if (!status_buffer) {
 		ZFCP_LOG_NORMAL("bug: could not get some buffer\n");
 		goto failed_buf;
 	}
 	memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
 	fsf_req->data.status_read.buffer = status_buffer;

 	/* insert pointer to respective buffer */
 	sbale = zfcp_qdio_sbale_curr(fsf_req);
 	sbale->addr = (void *) status_buffer;
 	sbale->length = sizeof(struct fsf_status_read_buffer);

 	/* start QDIO request for this FSF request */
 	retval = zfcp_fsf_req_send(fsf_req, NULL);
 	if (retval) {
 		ZFCP_LOG_DEBUG("error: Could not set-up unsolicited status "
 			       "environment.\n");
 		goto failed_req_send;
 	}

 	ZFCP_LOG_TRACE("Status Read request initiated (adapter%s)\n",
 		       zfcp_get_busid_by_adapter(adapter));
 	goto out;

  failed_req_send:
 	mempool_free(status_buffer, adapter->pool.data_status_read);

  failed_buf:
 	zfcp_fsf_req_free(fsf_req);
  failed_req_create:
  out:
 	write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 	return retval;
 }

 static int
 zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
 {
 	struct fsf_status_read_buffer *status_buffer;
 	struct zfcp_adapter *adapter;
 	struct zfcp_port *port;
 	unsigned long flags;

 	status_buffer = fsf_req->data.status_read.buffer;
 	adapter = fsf_req->adapter;

 	read_lock_irqsave(&zfcp_data.config_lock, flags);
 	list_for_each_entry(port, &adapter->port_list_head, list)
 	    if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
 		break;
 	read_unlock_irqrestore(&zfcp_data.config_lock, flags);

 	if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
 		ZFCP_LOG_NORMAL("bug: Reopen port indication received for"
 				"nonexisting port with d_id 0x%08x on "
 				"adapter %s. Ignored.\n",
 				status_buffer->d_id & ZFCP_DID_MASK,
 				zfcp_get_busid_by_adapter(adapter));
 		goto out;
 	}

 	switch (status_buffer->status_subtype) {

 	case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 		debug_text_event(adapter->erp_dbf, 3, "unsol_pc_phys:");
 		zfcp_erp_port_reopen(port, 0);
 		break;

 	case FSF_STATUS_READ_SUB_ERROR_PORT:
 		debug_text_event(adapter->erp_dbf, 1, "unsol_pc_err:");
 		zfcp_erp_port_shutdown(port, 0);
 		break;

 	default:
 		debug_text_event(adapter->erp_dbf, 0, "unsol_unk_sub:");
 		debug_exception(adapter->erp_dbf, 0,
 				&status_buffer->status_subtype, sizeof (u32));
 		ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
 				"for a reopen indication on port with "
 				"d_id 0x%08x on the adapter %s. "
 				"Ignored. (debug info 0x%x)\n",
 				status_buffer->d_id,
 				zfcp_get_busid_by_adapter(adapter),
 				status_buffer->status_subtype);
 	}
  out:
 	return 0;
 }

 /*
  * function:    zfcp_fsf_status_read_handler
  *
  * purpose:	is called for finished Open Port command
  *
  * returns:
  */
 static int
 zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = 0;
 	struct zfcp_adapter *adapter = fsf_req->adapter;
 	struct fsf_status_read_buffer *status_buffer =
 	    fsf_req->data.status_read.buffer;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 		mempool_free(status_buffer, adapter->pool.data_status_read);
 		zfcp_fsf_req_cleanup(fsf_req);
 		goto out;
 	}

 	switch (status_buffer->status_type) {

 	case FSF_STATUS_READ_PORT_CLOSED:
 		debug_text_event(adapter->erp_dbf, 3, "unsol_pclosed:");
 		debug_event(adapter->erp_dbf, 3,
 			    &status_buffer->d_id, sizeof (u32));
 		zfcp_fsf_status_read_port_closed(fsf_req);
 		break;

 	case FSF_STATUS_READ_INCOMING_ELS:
 		debug_text_event(adapter->erp_dbf, 3, "unsol_els:");
 		zfcp_fsf_incoming_els(fsf_req);
 		break;

 	case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 		debug_text_event(adapter->erp_dbf, 3, "unsol_sense:");
 		ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
 			      zfcp_get_busid_by_adapter(adapter));
                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, (char *) status_buffer,
                               sizeof(struct fsf_status_read_buffer));
 		break;

 	case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 		debug_text_event(adapter->erp_dbf, 3, "unsol_bit_err:");
 		ZFCP_LOG_NORMAL("Bit error threshold data received:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 			      (char *) status_buffer,
 			      sizeof (struct fsf_status_read_buffer));
 		break;

 	case FSF_STATUS_READ_LINK_DOWN:
 		debug_text_event(adapter->erp_dbf, 0, "unsol_link_down:");
 		ZFCP_LOG_INFO("Local link to adapter %s is down\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 				&adapter->status);
 		zfcp_erp_adapter_failed(adapter);
 		break;

 	case FSF_STATUS_READ_LINK_UP:
 		debug_text_event(adapter->erp_dbf, 2, "unsol_link_up:");
 		ZFCP_LOG_INFO("Local link to adapter %s was replugged. "
 			      "Restarting operations on this adapter\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		/* All ports should be marked as ready to run again */
 		zfcp_erp_modify_adapter_status(adapter,
 					       ZFCP_STATUS_COMMON_RUNNING,
 					       ZFCP_SET);
 		zfcp_erp_adapter_reopen(adapter,
 					ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 					| ZFCP_STATUS_COMMON_ERP_FAILED);
 		break;

 	case FSF_STATUS_READ_CFDC_UPDATED:
 		debug_text_event(adapter->erp_dbf, 2, "unsol_cfdc_update:");
 		ZFCP_LOG_INFO("CFDC has been updated on the adapter %s\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		zfcp_erp_adapter_access_changed(adapter);
 		break;

 	case FSF_STATUS_READ_CFDC_HARDENED:
 		debug_text_event(adapter->erp_dbf, 2, "unsol_cfdc_harden:");
 		switch (status_buffer->status_subtype) {
 		case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
 			ZFCP_LOG_INFO("CFDC of adapter %s saved on SE\n",
 				      zfcp_get_busid_by_adapter(adapter));
 			break;
 		case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
 			ZFCP_LOG_INFO("CFDC of adapter %s has been copied "
 				      "to the secondary SE\n",
 				zfcp_get_busid_by_adapter(adapter));
 			break;
 		default:
 			ZFCP_LOG_INFO("CFDC of adapter %s has been hardened\n",
 				      zfcp_get_busid_by_adapter(adapter));
 		}
 		break;

 	default:
 		debug_text_event(adapter->erp_dbf, 0, "unsol_unknown:");
 		debug_exception(adapter->erp_dbf, 0,
 				&status_buffer->status_type, sizeof (u32));
 		ZFCP_LOG_NORMAL("bug: An unsolicited status packet of unknown "
 				"type was received (debug info 0x%x)\n",
 				status_buffer->status_type);
 		ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
 			       status_buffer);
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) status_buffer,
 			      sizeof (struct fsf_status_read_buffer));
 		break;
 	}
 	mempool_free(status_buffer, adapter->pool.data_status_read);
 	zfcp_fsf_req_cleanup(fsf_req);
 	/*
 	 * recycle buffer and start new request repeat until outbound
 	 * queue is empty or adapter shutdown is requested
 	 */
 	/*
 	 * FIXME(qdio):
 	 * we may wait in the req_create for 5s during shutdown, so
 	 * qdio_cleanup will have to wait at least that long before returning
 	 * with failure to allow us a proper cleanup under all circumstances
 	 */
 	/*
 	 * FIXME:
 	 * allocation failure possible? (Is this code needed?)
 	 */
 	retval = zfcp_fsf_status_read(adapter, 0);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("Failed to create unsolicited status read "
 			      "request for the adapter %s.\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		/* temporary fix to avoid status read buffer shortage */
 		adapter->status_read_failed++;
 		if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
 		    < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
 			ZFCP_LOG_INFO("restart adapter %s due to status read "
 				      "buffer shortage\n",
 				      zfcp_get_busid_by_adapter(adapter));
 			zfcp_erp_adapter_reopen(adapter, 0);
 		}
 	}
  out:
 	return retval;
 }

 /*
  * function:    zfcp_fsf_abort_fcp_command
  *
  * purpose:	tells FSF to abort a running SCSI command
  *
  * returns:	address of initiated FSF request
  *		NULL - request could not be initiated
  *
  * FIXME(design): should be watched by a timeout !!!
  * FIXME(design) shouldn't this be modified to return an int
  *               also...don't know how though
  */
 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)
 {
 	volatile struct qdio_buffer_element *sbale;
 	unsigned long lock_flags;
 	struct zfcp_fsf_req *fsf_req = NULL;
 	int retval = 0;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
 				     req_flags, adapter->pool.fsf_req_abort,
 				     &lock_flags, &fsf_req);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Failed to create an abort command "
 			      "request for lun 0x%016Lx on port 0x%016Lx "
 			      "on adapter %s.\n",
 			      unit->fcp_lun,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_adapter(adapter));
 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	fsf_req->data.abort_fcp_command.unit = unit;

 	/* set handles of unit and its parent port in QTCB */
 	fsf_req->qtcb->header.lun_handle = unit->handle;
 	fsf_req->qtcb->header.port_handle = unit->port->handle;

 	/* set handle of request which should be aborted */
 	fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;

 	/* start QDIO request for this FSF request */

 	zfcp_fsf_start_scsi_er_timer(adapter);
 	retval = zfcp_fsf_req_send(fsf_req, NULL);
 	if (retval) {
 		del_timer(&adapter->scsi_er_timer);
 		ZFCP_LOG_INFO("error: Failed to send abort command request "
 			      "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      unit->port->wwpn, unit->fcp_lun);
 		zfcp_fsf_req_free(fsf_req);
 		fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_DEBUG("Abort FCP Command request initiated "
 		       "(adapter%s, port d_id=0x%08x, "
 		       "unit x%016Lx, old_req_id=0x%lx)\n",
 		       zfcp_get_busid_by_adapter(adapter),
 		       unit->port->d_id,
 		       unit->fcp_lun, old_req_id);
  out:
 	write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 	return fsf_req;
 }

 /*
  * function:    zfcp_fsf_abort_fcp_command_handler
  *
  * purpose:	is called for finished Abort FCP Command request
  *
  * returns:
  */
 static int
 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
 {
 	int retval = -EINVAL;
 	struct zfcp_unit *unit = new_fsf_req->data.abort_fcp_command.unit;
 	unsigned char status_qual =
 	    new_fsf_req->qtcb->header.fsf_status_qual.word[0];

 	del_timer(&new_fsf_req->adapter->scsi_er_timer);

 	if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		/* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
 		goto skip_fsfstatus;
 	}

 	/* evaluate FSF status in QTCB */
 	switch (new_fsf_req->qtcb->header.fsf_status) {

 	case FSF_PORT_HANDLE_NOT_VALID:
 		if (status_qual >> 4 != status_qual % 0xf) {
 			debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
 					 "fsf_s_phand_nv0");
 			/*
 			 * In this case a command that was sent prior to a port
 			 * reopen was aborted (handles are different). This is
 			 * fine.
 			 */
 		} else {
 			ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
 				      "port 0x%016Lx on adapter %s invalid. "
 				      "This may happen occasionally.\n",
 				      unit->port->handle,
 				      unit->port->wwpn,
 				      zfcp_get_busid_by_unit(unit));
 			ZFCP_LOG_INFO("status qualifier:\n");
 			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
 				      (char *) &new_fsf_req->qtcb->header.
 				      fsf_status_qual,
 				      sizeof (union fsf_status_qual));
 			/* Let's hope this sorts out the mess */
 			debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
 					 "fsf_s_phand_nv1");
 			zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 			new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		}
 		break;

 	case FSF_LUN_HANDLE_NOT_VALID:
 		if (status_qual >> 4 != status_qual % 0xf) {
 			/* 2 */
 			debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
 					 "fsf_s_lhand_nv0");
 			/*
 			 * In this case a command that was sent prior to a unit
 			 * reopen was aborted (handles are different).
 			 * This is fine.
 			 */
 		} else {
 			ZFCP_LOG_INFO
 			    ("Warning: Temporary LUN identifier 0x%x of LUN "
 			     "0x%016Lx on port 0x%016Lx on adapter %s is "
 			     "invalid. This may happen in rare cases. "
 			     "Trying to re-establish link.\n",
 			     unit->handle,
 			     unit->fcp_lun,
 			     unit->port->wwpn,
 			     zfcp_get_busid_by_unit(unit));
 			ZFCP_LOG_DEBUG("Status qualifier data:\n");
 			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 				      (char *) &new_fsf_req->qtcb->header.
 				      fsf_status_qual,
 				      sizeof (union fsf_status_qual));
 			/* Let's hope this sorts out the mess */
 			debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
 					 "fsf_s_lhand_nv1");
 			zfcp_erp_port_reopen(unit->port, 0);
 			new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		}
 		break;

 	case FSF_FCP_COMMAND_DOES_NOT_EXIST:
 		retval = 0;
 		debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
 				 "fsf_s_no_exist");
 		new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 		break;

 	case FSF_PORT_BOXED:
 		ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
 			      "be reopened\n", unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit));
 		debug_text_event(new_fsf_req->adapter->erp_dbf, 2,
 				 "fsf_s_pboxed");
 		zfcp_erp_port_reopen(unit->port, 0);
 		new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
 		    | ZFCP_STATUS_FSFREQ_RETRY;
 		break;

 	case FSF_LUN_BOXED:
                 ZFCP_LOG_INFO(
                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
                         "to be reopened\n",
                         unit->fcp_lun, unit->port->wwpn,
                         zfcp_get_busid_by_unit(unit));
                 debug_text_event(new_fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
                 zfcp_erp_unit_reopen(unit, 0);
                 zfcp_cmd_dbf_event_fsf("unitbox", new_fsf_req,
                         &new_fsf_req->qtcb->header.fsf_status_qual,
                         sizeof(union fsf_status_qual));
                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
                         | ZFCP_STATUS_FSFREQ_RETRY;
                 break;

 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 		case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 			debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ltest");
 			zfcp_test_link(unit->port);
 			new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			/* SCSI stack will escalate */
 			debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ulp");
 			new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		default:
 			ZFCP_LOG_NORMAL
 			    ("bug: Wrong status qualifier 0x%x arrived.\n",
 			     new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
 			debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
 					 "fsf_sq_inval:");
 			debug_exception(new_fsf_req->adapter->erp_dbf, 0,
 					&new_fsf_req->qtcb->header.
 					fsf_status_qual.word[0], sizeof (u32));
 			break;
 		}
 		break;

 	case FSF_GOOD:
 		retval = 0;
 		new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
 		break;

 	default:
 		ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
 				"(debug info 0x%x)\n",
 				new_fsf_req->qtcb->header.fsf_status);
 		debug_text_event(new_fsf_req->adapter->erp_dbf, 0,
 				 "fsf_s_inval:");
 		debug_exception(new_fsf_req->adapter->erp_dbf, 0,
 				&new_fsf_req->qtcb->header.fsf_status,
 				sizeof (u32));
 		break;
 	}
  skip_fsfstatus:
 	return retval;
 }

 /**
  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
  *	one SBALE
  * Two scatter-gather lists are passed, one for the reqeust and one for the
  * response.
  */
 static inline int
 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
                   struct scatterlist *resp, int resp_count)
 {
         return ((req_count == 1) &&
 		(resp_count == 1) &&
                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
 		  PAGE_MASK) ==
 		 ((unsigned long) (zfcp_sg_to_address(&req[0]) +
 				   req[0].length - 1) & PAGE_MASK)) &&
                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
 		  PAGE_MASK) ==
                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
 				   resp[0].length - 1) & PAGE_MASK)));
 }

 /**
  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
  *	the request
  * @pool: pointer to memory pool, if non-null this pool is used to allocate
  *	a struct zfcp_fsf_req
  * @erp_action: pointer to erp_action, if non-null the Generic Service request
  *	is sent within error recovery
  */
 int
 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
 		 struct zfcp_erp_action *erp_action)
 {
 	volatile struct qdio_buffer_element *sbale;
 	struct zfcp_port *port;
 	struct zfcp_adapter *adapter;
         struct zfcp_fsf_req *fsf_req;
         unsigned long lock_flags;
         int bytes;
 	int ret = 0;

 	port = ct->port;
 	adapter = port->adapter;

 	ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
 				  ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
 				  pool, &lock_flags, &fsf_req);
 	if (ret < 0) {
                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
 			      "adapter: %s\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		goto failed_req;
 	}

         if (erp_action != NULL) {
                 erp_action->fsf_req = fsf_req;
                 fsf_req->erp_action = erp_action;
         }

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
         if (zfcp_use_one_sbal(ct->req, ct->req_count,
                               ct->resp, ct->resp_count)){
                 /* both request buffer and response buffer
                    fit into one sbale each */
                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
                 sbale[2].length = ct->req[0].length;
                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
                 sbale[3].length = ct->resp[0].length;
                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
         } else if (adapter->supported_features &
                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
                 /* try to use chained SBALs */
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
                                                 ct->req, ct->req_count,
                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of CT request failed "
 				      "on adapter %s\n",
 				      zfcp_get_busid_by_adapter(adapter));
                         if (bytes == 0)
                                 ret = -ENOMEM;
                         else
                                 ret = bytes;

                         goto failed_send;
                 }
                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
                                                 ct->resp, ct->resp_count,
                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of CT request failed "
 				      "on adapter %s\n",
 				      zfcp_get_busid_by_adapter(adapter));
                         if (bytes == 0)
                                 ret = -ENOMEM;
                         else
                                 ret = bytes;

                         goto failed_send;
                 }
                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
         } else {
                 /* reject send generic request */
 		ZFCP_LOG_INFO(
 			"error: microcode does not support chained SBALs,"
                         "CT request too big (adapter %s)\n",
 			zfcp_get_busid_by_adapter(adapter));
                 ret = -EOPNOTSUPP;
                 goto failed_send;
         }

 	/* settings in QTCB */
 	fsf_req->qtcb->header.port_handle = port->handle;
 	fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
 	fsf_req->qtcb->bottom.support.timeout = ct->timeout;
         fsf_req->data.send_ct = ct;

 	/* start QDIO request for this FSF request */
 	ret = zfcp_fsf_req_send(fsf_req, ct->timer);
 	if (ret) {
 		ZFCP_LOG_DEBUG("error: initiation of CT request failed "
 			       "(adapter %s, port 0x%016Lx)\n",
 			       zfcp_get_busid_by_adapter(adapter), port->wwpn);
 		goto failed_send;
 	}

 	ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
 		       zfcp_get_busid_by_adapter(adapter), port->wwpn);
 	goto out;

  failed_send:
 	zfcp_fsf_req_free(fsf_req);
         if (erp_action != NULL) {
                 erp_action->fsf_req = NULL;
         }
  failed_req:
  out:
         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
 				lock_flags);
 	return ret;
 }

 /**
  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
  * @fsf_req: pointer to struct zfcp_fsf_req
  *
  * Data specific for the Generic Service request is passed by
  * fsf_req->data.send_ct
  * Usually a specific handler for the request is called via
  * fsf_req->data.send_ct->handler at end of this function.
  */
 static int
 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
 {
 	struct zfcp_port *port;
 	struct zfcp_adapter *adapter;
 	struct zfcp_send_ct *send_ct;
 	struct fsf_qtcb_header *header;
 	struct fsf_qtcb_bottom_support *bottom;
 	int retval = -EINVAL;
 	u16 subtable, rule, counter;

 	adapter = fsf_req->adapter;
 	send_ct = fsf_req->data.send_ct;
 	port = send_ct->port;
 	header = &fsf_req->qtcb->header;
 	bottom = &fsf_req->qtcb->bottom.support;

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

 	/* evaluate FSF status in QTCB */
 	switch (header->fsf_status) {

         case FSF_GOOD:
                 retval = 0;
 		break;

         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 		if (adapter->fc_service_class <= 3) {
 			ZFCP_LOG_INFO("error: adapter %s does not support fc "
 				      "class %d.\n",
 				      zfcp_get_busid_by_port(port),
 				      adapter->fc_service_class);
 		} else {
 			ZFCP_LOG_INFO("bug: The fibre channel class at the "
 				      "adapter %s is invalid. "
 				      "(debug info %d)\n",
 				      zfcp_get_busid_by_port(port),
 				      adapter->fc_service_class);
 		}
 		/* stop operation for this adapter */
 		debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		fsf_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:
 			/* reopening link to port */
 			debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
 			zfcp_test_link(port);
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			/* ERP strategy will escalate */
 			debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
                 default:
 			ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
 				      "arrived.\n",
 				      header->fsf_status_qual.word[0]);
 			break;
                 }
                 break;

 	case FSF_ACCESS_DENIED:
 		ZFCP_LOG_NORMAL("access denied, cannot send generic service "
 				"command (adapter %s, port d_id=0x%08x)\n",
 				zfcp_get_busid_by_port(port), port->d_id);
 		for (counter = 0; counter < 2; counter++) {
 			subtable = header->fsf_status_qual.halfword[counter * 2];
 			rule = header->fsf_status_qual.halfword[counter * 2 + 1];
 			switch (subtable) {
 			case FSF_SQ_CFDC_SUBTABLE_OS:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
 			case FSF_SQ_CFDC_SUBTABLE_LUN:
        				ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
 					zfcp_act_subtable_type[subtable], rule);
 				break;
 			}
 		}
 		debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
 		zfcp_erp_port_access_denied(port);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

         case FSF_GENERIC_COMMAND_REJECTED:
 		ZFCP_LOG_INFO("generic service command rejected "
 			      "(adapter %s, port d_id=0x%08x)\n",
 			      zfcp_get_busid_by_port(port), port->d_id);
 		ZFCP_LOG_INFO("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(adapter->erp_dbf, 1, "fsf_s_gcom_rej");
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

         case FSF_PORT_HANDLE_NOT_VALID:
 		ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
 			       "0x%016Lx on adapter %s invalid. This may "
 			       "happen occasionally.\n", port->handle,
 			       port->wwpn, zfcp_get_busid_by_port(port));
 		ZFCP_LOG_INFO("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(adapter->erp_dbf, 1, "fsf_s_phandle_nv");
 		zfcp_erp_adapter_reopen(adapter, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

         case FSF_PORT_BOXED:
 		ZFCP_LOG_INFO("port needs to be reopened "
 			      "(adapter %s, port d_id=0x%08x)\n",
 			      zfcp_get_busid_by_port(port), port->d_id);
 		debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
 		zfcp_erp_port_reopen(port, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
 		    | ZFCP_STATUS_FSFREQ_RETRY;
 		break;

 	/* following states should never occure, all cases avoided
 	   in zfcp_fsf_send_ct - but who knows ... */
 	case FSF_PAYLOAD_SIZE_MISMATCH:
 		ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
 			      "req_buf_length=%d, resp_buf_length=%d)\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      bottom->req_buf_length, bottom->resp_buf_length);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_REQUEST_SIZE_TOO_LARGE:
 		ZFCP_LOG_INFO("request size too large (adapter: %s, "
 			      "req_buf_length=%d)\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      bottom->req_buf_length);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_RESPONSE_SIZE_TOO_LARGE:
 		ZFCP_LOG_INFO("response size too large (adapter: %s, "
 			      "resp_buf_length=%d)\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      bottom->resp_buf_length);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_SBAL_MISMATCH:
 		ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
 			      "resp_buf_length=%d)\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      bottom->req_buf_length, bottom->resp_buf_length);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

        default:
 		ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
 				"(debug info 0x%x)\n", header->fsf_status);
 		debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval:");
 		debug_exception(adapter->erp_dbf, 0,
 				&header->fsf_status_qual.word[0], sizeof (u32));
 		break;
 	}

 skip_fsfstatus:
 	send_ct->status = retval;

 	if (send_ct->handler != NULL)
 		send_ct->handler(send_ct->handler_data);

 	return retval;
 }

 /**
  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
  * @els: pointer to struct zfcp_send_els which contains all needed data for
  *	the command.
  */
 int
 zfcp_fsf_send_els(struct zfcp_send_els *els)
 {
 	volatile struct qdio_buffer_element *sbale;
 	struct zfcp_fsf_req *fsf_req;
 	fc_id_t d_id;
 	struct zfcp_adapter *adapter;
 	unsigned long lock_flags;
         int bytes;
 	int ret = 0;

 	d_id = els->d_id;
 	adapter = els->adapter;

         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
 				  ZFCP_REQ_AUTO_CLEANUP,
 				  NULL, &lock_flags, &fsf_req);
 	if (ret < 0) {
                 ZFCP_LOG_INFO("error: creation of ELS request failed "
 			      "(adapter %s, port d_id: 0x%08x)\n",
                               zfcp_get_busid_by_adapter(adapter), d_id);
                 goto failed_req;
 	}

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
         if (zfcp_use_one_sbal(els->req, els->req_count,
                               els->resp, els->resp_count)){
                 /* both request buffer and response buffer
                    fit into one sbale each */
                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
                 sbale[2].length = els->req[0].length;
                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
                 sbale[3].length = els->resp[0].length;
                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
         } else if (adapter->supported_features &
                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
                 /* try to use chained SBALs */
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
                                                 els->req, els->req_count,
                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of ELS request failed "
 				      "(adapter %s, port d_id: 0x%08x)\n",
 				      zfcp_get_busid_by_adapter(adapter), d_id);
                         if (bytes == 0) {
                                 ret = -ENOMEM;
                         } else {
                                 ret = bytes;
                         }
                         goto failed_send;
                 }
                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
                                                 els->resp, els->resp_count,
                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of ELS request failed "
 				      "(adapter %s, port d_id: 0x%08x)\n",
 				      zfcp_get_busid_by_adapter(adapter), d_id);
                         if (bytes == 0) {
                                 ret = -ENOMEM;
                         } else {
                                 ret = bytes;
                         }
                         goto failed_send;
                 }
                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
         } else {
                 /* reject request */
 		ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
                               ", ELS request too big (adapter %s, "
 			      "port d_id: 0x%08x)\n",
 			      zfcp_get_busid_by_adapter(adapter), d_id);
                 ret = -EOPNOTSUPP;
                 goto failed_send;
         }

 	/* settings in QTCB */
 	fsf_req->qtcb->bottom.support.d_id = d_id;
 	fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
 	fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
 	fsf_req->data.send_els = els;

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);

 	/* start QDIO request for this FSF request */
 	ret = zfcp_fsf_req_send(fsf_req, els->timer);
 	if (ret) {
 		ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
 			       "(adapter %s, port d_id: 0x%08x)\n",
 			       zfcp_get_busid_by_adapter(adapter), d_id);
 		goto failed_send;
 	}

 	ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
 		       "0x%08x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
 	goto out;

  failed_send:
 	zfcp_fsf_req_free(fsf_req);

  failed_req:
  out:
 	write_unlock_irqrestore(&adapter->request_queue.queue_lock,
 				lock_flags);

         return ret;
 }

 /**
  * zfcp_fsf_send_els_handler - handler for ELS commands
  * @fsf_req: pointer to struct zfcp_fsf_req
  *
  * Data specific for the ELS command is passed by
  * fsf_req->data.send_els
  * Usually a specific handler for the command is called via
  * fsf_req->data.send_els->handler at end of this function.
  */
 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
 {
 	struct zfcp_adapter *adapter;
 	fc_id_t d_id;
 	struct zfcp_port *port;
 	struct fsf_qtcb_header *header;
 	struct fsf_qtcb_bottom_support *bottom;
 	struct zfcp_send_els *send_els;
 	int retval = -EINVAL;
 	u16 subtable, rule, counter;

 	send_els = fsf_req->data.send_els;
 	adapter = send_els->adapter;
 	d_id = send_els->d_id;
 	header = &fsf_req->qtcb->header;
 	bottom = &fsf_req->qtcb->bottom.support;

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

 	switch (header->fsf_status) {

 	case FSF_GOOD:
 		retval = 0;
 		break;

 	case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 		if (adapter->fc_service_class <= 3) {
 			ZFCP_LOG_INFO("error: adapter %s does "
 				      "not support fibrechannel class %d.\n",
 				      zfcp_get_busid_by_adapter(adapter),
 				      adapter->fc_service_class);
 		} else {
 			ZFCP_LOG_INFO("bug: The fibrechannel class at "
 				      "adapter %s is invalid. "
 				      "(debug info %d)\n",
 				      zfcp_get_busid_by_adapter(adapter),
 				      adapter->fc_service_class);
 		}
 		/* stop operation for this adapter */
 		debug_text_exception(adapter->erp_dbf, 0, "fsf_s_class_nsup");
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		fsf_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:
 			debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ltest");
 			if (send_els->ls_code != ZFCP_LS_ADISC) {
 				read_lock(&zfcp_data.config_lock);
 				port = zfcp_get_port_by_did(adapter, d_id);
 				if (port)
 					zfcp_test_link(port);
 				read_unlock(&zfcp_data.config_lock);
 			}
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			debug_text_event(adapter->erp_dbf, 1, "fsf_sq_ulp");
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			retval =
 			  zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
 					      (struct zfcp_ls_rjt_par *)
 					      &header->fsf_status_qual.word[2]);
 			break;
 		case FSF_SQ_RETRY_IF_POSSIBLE:
 			debug_text_event(adapter->erp_dbf, 1, "fsf_sq_retry");
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		default:
 			ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
 				      header->fsf_status_qual.word[0]);
 			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
 				(char*)header->fsf_status_qual.word, 16);
 		}
 		break;

 	case FSF_ELS_COMMAND_REJECTED:
 		ZFCP_LOG_INFO("ELS has been rejected because command filter "
 			      "prohibited sending "
 			      "(adapter: %s, port d_id: 0x%08x)\n",
 			      zfcp_get_busid_by_adapter(adapter), d_id);

 		break;

 	case FSF_PAYLOAD_SIZE_MISMATCH:
 		ZFCP_LOG_INFO(
 			"ELS request size and ELS response size must be either "
 			"both 0, or both greater than 0 "
 			"(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
 			zfcp_get_busid_by_adapter(adapter),
 			bottom->req_buf_length,
 			bottom->resp_buf_length);
 		break;

 	case FSF_REQUEST_SIZE_TOO_LARGE:
 		ZFCP_LOG_INFO(
 			"Length of the ELS request buffer, "
 			"specified in QTCB bottom, "
 			"exceeds the size of the buffers "
 			"that have been allocated for ELS request data "
 			"(adapter: %s, req_buf_length=%d)\n",
 			zfcp_get_busid_by_adapter(adapter),
 			bottom->req_buf_length);
 		break;

 	case FSF_RESPONSE_SIZE_TOO_LARGE:
 		ZFCP_LOG_INFO(
 			"Length of the ELS response buffer, "
 			"specified in QTCB bottom, "
 			"exceeds the size of the buffers "
 			"that have been allocated for ELS response data "
 			"(adapter: %s, resp_buf_length=%d)\n",
 			zfcp_get_busid_by_adapter(adapter),
 			bottom->resp_buf_length);
 		break;

 	case FSF_SBAL_MISMATCH:
 		/* should never occure, avoided in zfcp_fsf_send_els */
 		ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
 			      "resp_buf_length=%d)\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      bottom->req_buf_length, bottom->resp_buf_length);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_ACCESS_DENIED:
 		ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
 				"(adapter %s, port d_id=0x%08x)\n",
 				zfcp_get_busid_by_adapter(adapter), d_id);
 		for (counter = 0; counter < 2; counter++) {
 			subtable = header->fsf_status_qual.halfword[counter * 2];
 			rule = header->fsf_status_qual.halfword[counter * 2 + 1];
 			switch (subtable) {
 			case FSF_SQ_CFDC_SUBTABLE_OS:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
 			case FSF_SQ_CFDC_SUBTABLE_LUN:
 				ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
 					zfcp_act_subtable_type[subtable], rule);
 				break;
 			}
 		}
 		debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
 		read_lock(&zfcp_data.config_lock);
 		port = zfcp_get_port_by_did(adapter, d_id);
 		if (port != NULL)
 			zfcp_erp_port_access_denied(port);
 		read_unlock(&zfcp_data.config_lock);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	default:
 		ZFCP_LOG_NORMAL(
 			"bug: An unknown FSF Status was presented "
 			"(adapter: %s, fsf_status=0x%08x)\n",
 			zfcp_get_busid_by_adapter(adapter),
 			header->fsf_status);
 		debug_text_event(adapter->erp_dbf, 0, "fsf_sq_inval");
 		debug_exception(adapter->erp_dbf, 0,
 			&header->fsf_status_qual.word[0], sizeof(u32));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	}

 skip_fsfstatus:
 	send_els->status = retval;

 	if (send_els->handler != 0)
 		send_els->handler(send_els->handler_data);

 	return retval;
 }

 /*
  * function:
  *
  * purpose:
  *
  * returns:	address of initiated FSF request
  *		NULL - request could not be initiated
  */
 int
 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
 {
 	volatile struct qdio_buffer_element *sbale;
 	unsigned long lock_flags;
 	int retval = 0;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(erp_action->adapter,
 				     FSF_QTCB_EXCHANGE_CONFIG_DATA,
 				     ZFCP_REQ_AUTO_CLEANUP,
 				     erp_action->adapter->pool.fsf_req_erp,
 				     &lock_flags, &(erp_action->fsf_req));
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create exchange configuration "
 			      "data request for adapter %s.\n",
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
                                     erp_action->fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	erp_action->fsf_req->erp_action = erp_action;
 	erp_action->fsf_req->qtcb->bottom.config.feature_selection =
 		(FSF_FEATURE_CFDC | FSF_FEATURE_LUN_SHARING);

 	/* start QDIO request for this FSF request */
 	retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
 	if (retval) {
 		ZFCP_LOG_INFO
 		    ("error: Could not send exchange configuration data "
 		     "command on the adapter %s\n",
 		     zfcp_get_busid_by_adapter(erp_action->adapter));
 		zfcp_fsf_req_free(erp_action->fsf_req);
 		erp_action->fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_DEBUG("exchange configuration data request initiated "
 		       "(adapter %s)\n",
 		       zfcp_get_busid_by_adapter(erp_action->adapter));

  out:
 	write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
 				lock_flags);
 	return retval;
 }

 /**
  * zfcp_fsf_exchange_config_evaluate
  * @fsf_req: fsf_req which belongs to xchg config data request
  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
  *
  * returns: -EIO on error, 0 otherwise
  */
 static int
 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
 {
 	struct fsf_qtcb_bottom_config *bottom;
 	struct zfcp_adapter *adapter = fsf_req->adapter;

 	bottom = &fsf_req->qtcb->bottom.config;
 	ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
 		       bottom->low_qtcb_version, bottom->high_qtcb_version);
 	adapter->fsf_lic_version = bottom->lic_version;
 	adapter->supported_features = bottom->supported_features;
 	adapter->peer_wwpn = 0;
 	adapter->peer_wwnn = 0;
 	adapter->peer_d_id = 0;

 	if (xchg_ok) {
 		adapter->wwnn = bottom->nport_serv_param.wwnn;
 		adapter->wwpn = bottom->nport_serv_param.wwpn;
 		adapter->s_id = bottom->s_id & ZFCP_DID_MASK;
 		adapter->fc_topology = bottom->fc_topology;
 		adapter->fc_link_speed = bottom->fc_link_speed;
 		adapter->hydra_version = bottom->adapter_type;
 	} else {
 		adapter->wwnn = 0;
 		adapter->wwpn = 0;
 		adapter->s_id = 0;
 		adapter->fc_topology = 0;
 		adapter->fc_link_speed = 0;
 		adapter->hydra_version = 0;
 	}

 	if (adapter->fc_topology == 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;
 	}

 	if(adapter->supported_features & FSF_FEATURE_HBAAPI_MANAGEMENT){
 		adapter->hardware_version = bottom->hardware_version;
 		memcpy(adapter->serial_number, bottom->serial_number, 17);
 		EBCASC(adapter->serial_number, sizeof(adapter->serial_number));
 	}

 	ZFCP_LOG_NORMAL("The adapter %s reported the following characteristics:\n"
 		      "WWNN 0x%016Lx, "
 		      "WWPN 0x%016Lx, "
 		      "S_ID 0x%08x,\n"
 		      "adapter version 0x%x, "
 		      "LIC version 0x%x, "
 		      "FC link speed %d Gb/s\n",
 		      zfcp_get_busid_by_adapter(adapter),
 		      adapter->wwnn,
 		      adapter->wwpn,
 		      (unsigned int) adapter->s_id,
 		      adapter->hydra_version,
 		      adapter->fsf_lic_version,
 		      adapter->fc_link_speed);
 	if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
 		ZFCP_LOG_NORMAL("error: the adapter %s "
 				"only supports newer control block "
 				"versions in comparison to this device "
 				"driver (try updated device driver)\n",
 				zfcp_get_busid_by_adapter(adapter));
 		debug_text_event(adapter->erp_dbf, 0, "low_qtcb_ver");
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		return -EIO;
 	}
 	if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
 		ZFCP_LOG_NORMAL("error: the adapter %s "
 				"only supports older control block "
 				"versions than this device driver uses"
 				"(consider a microcode upgrade)\n",
 				zfcp_get_busid_by_adapter(adapter));
 		debug_text_event(adapter->erp_dbf, 0, "high_qtcb_ver");
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		return -EIO;
 	}
 	return 0;
 }

 /*
  * function:    zfcp_fsf_exchange_config_data_handler
  *
  * purpose:     is called for finished Exchange Configuration Data command
  *
  * returns:
  */
 static int
 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
 {
 	struct fsf_qtcb_bottom_config *bottom;
 	struct zfcp_adapter *adapter = fsf_req->adapter;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
 		return -EIO;

 	switch (fsf_req->qtcb->header.fsf_status) {

 	case FSF_GOOD:
 		if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
 			return -EIO;

 		switch (adapter->fc_topology) {
 		case FSF_TOPO_P2P:
 			ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
 					"configuration detected at adapter %s\n"
 					"Peer WWNN 0x%016llx, "
 					"peer WWPN 0x%016llx, "
 					"peer d_id 0x%06x\n",
 					zfcp_get_busid_by_adapter(adapter),
 					adapter->peer_wwnn,
 					adapter->peer_wwpn,
 					adapter->peer_d_id);
 			debug_text_event(fsf_req->adapter->erp_dbf, 0,
 					 "top-p-to-p");
 			break;
 		case FSF_TOPO_AL:
 			ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
 					"topology detected at adapter %s "
 					"unsupported, shutting down adapter\n",
 					zfcp_get_busid_by_adapter(adapter));
 			debug_text_event(fsf_req->adapter->erp_dbf, 0,
 					 "top-al");
 			zfcp_erp_adapter_shutdown(adapter, 0);
 			return -EIO;
 		case FSF_TOPO_FABRIC:
 			ZFCP_LOG_INFO("Switched fabric fibrechannel "
 				      "network detected at adapter %s.\n",
 				      zfcp_get_busid_by_adapter(adapter));
 			break;
 		default:
 			ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
 					"reported by the exchange "
 					"configuration command for "
 					"the adapter %s is not "
 					"of a type known to the zfcp "
 					"driver, shutting down adapter\n",
 					zfcp_get_busid_by_adapter(adapter));
 			adapter->fc_topology = FSF_TOPO_ERROR;
 			debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 					     "unknown-topo");
 			zfcp_erp_adapter_shutdown(adapter, 0);
 			return -EIO;
 		}
 		bottom = &fsf_req->qtcb->bottom.config;
 		if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 			ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
 					"allowed by the adapter %s "
 					"is lower than the minimum "
 					"required by the driver (%ld bytes).\n",
 					bottom->max_qtcb_size,
 					zfcp_get_busid_by_adapter(adapter),
 					sizeof(struct fsf_qtcb));
 			debug_text_event(fsf_req->adapter->erp_dbf, 0,
 					 "qtcb-size");
 			debug_event(fsf_req->adapter->erp_dbf, 0,
 				    &bottom->max_qtcb_size, sizeof (u32));
 			zfcp_erp_adapter_shutdown(adapter, 0);
 			return -EIO;
 		}
 		atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 				&adapter->status);
 		break;
 	case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 		debug_text_event(adapter->erp_dbf, 0, "xchg-inco");

 		if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
 			return -EIO;

 		ZFCP_LOG_INFO("Local link to adapter %s is down\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 				ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 				&adapter->status);
 		zfcp_erp_adapter_failed(adapter);
 		break;
 	default:
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf-stat-ng");
 		debug_event(fsf_req->adapter->erp_dbf, 0,
 			    &fsf_req->qtcb->header.fsf_status, sizeof (u32));
 		zfcp_erp_adapter_shutdown(adapter, 0);
 		return -EIO;
 	}
 	return 0;
 }

 /**
  * zfcp_fsf_exchange_port_data - request information about local port
  * @adapter: for which port data is requested
  * @data: response to exchange port data request
  */
 int
 zfcp_fsf_exchange_port_data(struct zfcp_adapter *adapter,
 			    struct fsf_qtcb_bottom_port *data)
 {
 	volatile struct qdio_buffer_element *sbale;
 	int retval = 0;
 	unsigned long lock_flags;
         struct zfcp_fsf_req *fsf_req;
 	struct timer_list *timer;

         if(!(adapter->supported_features & FSF_FEATURE_HBAAPI_MANAGEMENT)){
 		ZFCP_LOG_INFO("error: exchange port data "
                               "command not supported by adapter %s\n",
 			      zfcp_get_busid_by_adapter(adapter));
                 return -EOPNOTSUPP;
         }

 	timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
 	if (!timer)
 		return -ENOMEM;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
                                      0, 0, &lock_flags, &fsf_req);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Out of resources. Could not create an "
                               "exchange port data request for"
                               "the adapter %s.\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		write_unlock_irqrestore(&adapter->request_queue.queue_lock,
 					lock_flags);
 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

         fsf_req->data.port_data = data;

 	init_timer(timer);
 	timer->function = zfcp_fsf_request_timeout_handler;
 	timer->data = (unsigned long) adapter;
 	timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;

 	retval = zfcp_fsf_req_send(fsf_req, timer);
 	if (retval) {
 		ZFCP_LOG_INFO("error: Could not send an exchange port data "
                               "command on the adapter %s\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		zfcp_fsf_req_free(fsf_req);
 		write_unlock_irqrestore(&adapter->request_queue.queue_lock,
 					lock_flags);
 		goto out;
 	}

 	ZFCP_LOG_DEBUG("Exchange Port Data request initiated (adapter %s)\n",
 		       zfcp_get_busid_by_adapter(adapter));

 	write_unlock_irqrestore(&adapter->request_queue.queue_lock,
 				lock_flags);

 	wait_event(fsf_req->completion_wq,
 		   fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 	del_timer_sync(timer);
 	zfcp_fsf_req_cleanup(fsf_req);
  out:
 	kfree(timer);
 	return retval;
 }


 /**
  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
  * @fsf_req: pointer to struct zfcp_fsf_req
  */
 static void
 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
 {
 	struct fsf_qtcb_bottom_port *bottom;
 	struct fsf_qtcb_bottom_port *data = fsf_req->data.port_data;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
 		return;

 	switch (fsf_req->qtcb->header.fsf_status) {
         case FSF_GOOD:
                 bottom = &fsf_req->qtcb->bottom.port;
                 memcpy(data, bottom, sizeof(*data));
                 break;

         default:
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "xchg-port-ng");
                 debug_event(fsf_req->adapter->erp_dbf, 0,
 			    &fsf_req->qtcb->header.fsf_status, sizeof(u32));
 	}
 }


 /*
  * function:    zfcp_fsf_open_port
  *
  * purpose:
  *
  * returns:	address of initiated FSF request
  *		NULL - request could not be initiated
  */
 int
 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
 {
 	volatile struct qdio_buffer_element *sbale;
 	unsigned long lock_flags;
 	int retval = 0;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(erp_action->adapter,
 				     FSF_QTCB_OPEN_PORT_WITH_DID,
 				     ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
 				     erp_action->adapter->pool.fsf_req_erp,
 				     &lock_flags, &(erp_action->fsf_req));
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create open port request "
 			      "for port 0x%016Lx on adapter %s.\n",
 			      erp_action->port->wwpn,
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
                                     erp_action->fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	erp_action->fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
 	atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
 	erp_action->fsf_req->data.open_port.port = erp_action->port;
 	erp_action->fsf_req->erp_action = erp_action;

 	/* start QDIO request for this FSF request */
 	retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
 	if (retval) {
 		ZFCP_LOG_INFO("error: Could not send open port request for "
 			      "port 0x%016Lx on adapter %s.\n",
 			      erp_action->port->wwpn,
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		zfcp_fsf_req_free(erp_action->fsf_req);
 		erp_action->fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_DEBUG("open port request initiated "
 		       "(adapter %s,  port 0x%016Lx)\n",
 		       zfcp_get_busid_by_adapter(erp_action->adapter),
 		       erp_action->port->wwpn);
  out:
 	write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
 				lock_flags);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_open_port_handler
  *
  * purpose:	is called for finished Open Port command
  *
  * returns:
  */
 static int
 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = -EINVAL;
 	struct zfcp_port *port;
 	struct fsf_plogi *plogi;
 	struct fsf_qtcb_header *header;
 	u16 subtable, rule, counter;

 	port = fsf_req->data.open_port.port;
 	header = &fsf_req->qtcb->header;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		/* don't change port status in our bookkeeping */
 		goto skip_fsfstatus;
 	}

 	/* evaluate FSF status in QTCB */
 	switch (header->fsf_status) {

 	case FSF_PORT_ALREADY_OPEN:
 		ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
 				"is already open.\n",
 				port->wwpn, zfcp_get_busid_by_port(port));
 		debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 				     "fsf_s_popen");
 		/*
 		 * This is a bug, however operation should continue normally
 		 * if it is simply ignored
 		 */
 		break;

 	case FSF_ACCESS_DENIED:
 		ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
 				"on adapter %s\n",
 				port->wwpn, zfcp_get_busid_by_port(port));
 		for (counter = 0; counter < 2; counter++) {
 			subtable = header->fsf_status_qual.halfword[counter * 2];
 			rule = header->fsf_status_qual.halfword[counter * 2 + 1];
 			switch (subtable) {
 			case FSF_SQ_CFDC_SUBTABLE_OS:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
 			case FSF_SQ_CFDC_SUBTABLE_LUN:
 				ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
 					zfcp_act_subtable_type[subtable], rule);
 				break;
 			}
 		}
 		debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
 		zfcp_erp_port_access_denied(port);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
 		ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
 			      "The remote port 0x%016Lx on adapter %s "
 			      "could not be opened. Disabling it.\n",
 			      port->wwpn, zfcp_get_busid_by_port(port));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_max_ports");
 		zfcp_erp_port_failed(port);
 		fsf_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:
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ltest");
 			/* ERP strategy will escalate */
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			/* ERP strategy will escalate */
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ulp");
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		case FSF_SQ_NO_RETRY_POSSIBLE:
 			ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
 					"adapter %s could not be opened. "
 					"Disabling it.\n",
 					port->wwpn,
 					zfcp_get_busid_by_port(port));
 			debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 					     "fsf_sq_no_retry");
 			zfcp_erp_port_failed(port);
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		default:
 			ZFCP_LOG_NORMAL
 			    ("bug: Wrong status qualifier 0x%x arrived.\n",
 			     header->fsf_status_qual.word[0]);
 			debug_text_event(fsf_req->adapter->erp_dbf, 0,
 					 "fsf_sq_inval:");
 			debug_exception(
 				fsf_req->adapter->erp_dbf, 0,
 				&header->fsf_status_qual.word[0],
 				sizeof (u32));
 			break;
 		}
 		break;

 	case FSF_GOOD:
 		/* save port handle assigned by FSF */
 		port->handle = header->port_handle;
 		ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
 			      "was opened, it's port handle is 0x%x\n",
 			      port->wwpn, zfcp_get_busid_by_port(port),
 			      port->handle);
 		/* mark port as open */
 		atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
 				ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
 		retval = 0;
 		/* 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 *) fsf_req->qtcb->bottom.support.els;
 		if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
 		{
 			if (fsf_req->qtcb->bottom.support.els1_length <
 			    ((((unsigned long) &plogi->serv_param.wwpn) -
 			      ((unsigned long) plogi)) + sizeof (u64))) {
 				ZFCP_LOG_INFO(
 					"warning: insufficient length of "
 					"PLOGI payload (%i)\n",
 					fsf_req->qtcb->bottom.support.els1_length);
 				debug_text_event(fsf_req->adapter->erp_dbf, 0,
 						 "fsf_s_short_plogi:");
 				/* skip sanity check and assume wwpn is ok */
 			} else {
 				if (plogi->serv_param.wwpn != port->wwpn) {
 					ZFCP_LOG_INFO("warning: d_id of port "
 						      "0x%016Lx changed during "
 						      "open\n", port->wwpn);
 					debug_text_event(
 						fsf_req->adapter->erp_dbf, 0,
 						"fsf_s_did_change:");
 					atomic_clear_mask(
 						ZFCP_STATUS_PORT_DID_DID,
 						&port->status);
 				} else
 					port->wwnn = plogi->serv_param.wwnn;
 			}
 		}
 		break;

 	case FSF_UNKNOWN_OP_SUBTYPE:
 		/* should never occure, subtype not set in zfcp_fsf_open_port */
 		ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
 			      "op_subtype=0x%x)\n",
 			      zfcp_get_busid_by_port(port),
 			      fsf_req->qtcb->bottom.support.operation_subtype);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	default:
 		ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
 				"(debug info 0x%x)\n",
 				header->fsf_status);
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
 		debug_exception(fsf_req->adapter->erp_dbf, 0,
 				&header->fsf_status, sizeof (u32));
 		break;
 	}

  skip_fsfstatus:
 	atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_close_port
  *
  * purpose:     submit FSF command "close port"
  *
  * returns:     address of initiated FSF request
  *              NULL - request could not be initiated
  */
 int
 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
 {
 	volatile struct qdio_buffer_element *sbale;
 	unsigned long lock_flags;
 	int retval = 0;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(erp_action->adapter,
 				     FSF_QTCB_CLOSE_PORT,
 				     ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
 				     erp_action->adapter->pool.fsf_req_erp,
 				     &lock_flags, &(erp_action->fsf_req));
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create a close port request "
 			      "for port 0x%016Lx on adapter %s.\n",
 			      erp_action->port->wwpn,
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
                                     erp_action->fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
 	erp_action->fsf_req->data.close_port.port = erp_action->port;
 	erp_action->fsf_req->erp_action = erp_action;
 	erp_action->fsf_req->qtcb->header.port_handle =
 	    erp_action->port->handle;

 	/* start QDIO request for this FSF request */
 	retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
 	if (retval) {
 		ZFCP_LOG_INFO("error: Could not send a close port request for "
 			      "port 0x%016Lx on adapter %s.\n",
 			      erp_action->port->wwpn,
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		zfcp_fsf_req_free(erp_action->fsf_req);
 		erp_action->fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_TRACE("close port request initiated "
 		       "(adapter %s, port 0x%016Lx)\n",
 		       zfcp_get_busid_by_adapter(erp_action->adapter),
 		       erp_action->port->wwpn);
  out:
 	write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
 				lock_flags);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_close_port_handler
  *
  * purpose:     is called for finished Close Port FSF command
  *
  * returns:
  */
 static int
 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = -EINVAL;
 	struct zfcp_port *port;

 	port = fsf_req->data.close_port.port;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		/* don't change port status in our bookkeeping */
 		goto skip_fsfstatus;
 	}

 	/* evaluate FSF status in QTCB */
 	switch (fsf_req->qtcb->header.fsf_status) {

 	case FSF_PORT_HANDLE_NOT_VALID:
 		ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
 			      "0x%016Lx on adapter %s invalid. This may happen "
 			      "occasionally.\n", port->handle,
 			      port->wwpn, zfcp_get_busid_by_port(port));
 		ZFCP_LOG_DEBUG("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &fsf_req->qtcb->header.fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_phand_nv");
 		zfcp_erp_adapter_reopen(port->adapter, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		/* Note: FSF has actually closed the port in this case.
 		 * The status code is just daft. Fingers crossed for a change
 		 */
 		retval = 0;
 		break;

 	case FSF_GOOD:
 		ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
 			       "port handle 0x%x\n", port->wwpn,
 			       zfcp_get_busid_by_port(port), port->handle);
 		zfcp_erp_modify_port_status(port,
 					    ZFCP_STATUS_COMMON_OPEN,
 					    ZFCP_CLEAR);
 		retval = 0;
 		break;

 	default:
 		ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
 				"(debug info 0x%x)\n",
 				fsf_req->qtcb->header.fsf_status);
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
 		debug_exception(fsf_req->adapter->erp_dbf, 0,
 				&fsf_req->qtcb->header.fsf_status,
 				sizeof (u32));
 		break;
 	}

  skip_fsfstatus:
 	atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_close_physical_port
  *
  * purpose:     submit FSF command "close physical port"
  *
  * returns:     address of initiated FSF request
  *              NULL - request could not be initiated
  */
 int
 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
 {
 	int retval = 0;
 	unsigned long lock_flags;
 	volatile struct qdio_buffer_element *sbale;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(erp_action->adapter,
 				     FSF_QTCB_CLOSE_PHYSICAL_PORT,
 				     ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
 				     erp_action->adapter->pool.fsf_req_erp,
 				     &lock_flags, &erp_action->fsf_req);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create close physical port "
 			      "request (adapter %s, port 0x%016Lx)\n",
 			      zfcp_get_busid_by_adapter(erp_action->adapter),
 			      erp_action->port->wwpn);

 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
 				    erp_action->fsf_req->sbal_curr, 0);
 	sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
 	sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	/* mark port as being closed */
 	atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
 			&erp_action->port->status);
 	/* save a pointer to this port */
 	erp_action->fsf_req->data.close_physical_port.port = erp_action->port;
 	/* port to be closeed */
 	erp_action->fsf_req->qtcb->header.port_handle =
 	    erp_action->port->handle;
 	erp_action->fsf_req->erp_action = erp_action;

 	/* start QDIO request for this FSF request */
 	retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
 	if (retval) {
 		ZFCP_LOG_INFO("error: Could not send close physical port "
 			      "request (adapter %s, port 0x%016Lx)\n",
 			      zfcp_get_busid_by_adapter(erp_action->adapter),
 			      erp_action->port->wwpn);
 		zfcp_fsf_req_free(erp_action->fsf_req);
 		erp_action->fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_TRACE("close physical port request initiated "
 		       "(adapter %s, port 0x%016Lx)\n",
 		       zfcp_get_busid_by_adapter(erp_action->adapter),
 		       erp_action->port->wwpn);
  out:
 	write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
 				lock_flags);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_close_physical_port_handler
  *
  * purpose:     is called for finished Close Physical Port FSF command
  *
  * returns:
  */
 static int
 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = -EINVAL;
 	struct zfcp_port *port;
 	struct zfcp_unit *unit;
 	struct fsf_qtcb_header *header;
 	u16 subtable, rule, counter;

 	port = fsf_req->data.close_physical_port.port;
 	header = &fsf_req->qtcb->header;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		/* don't change port status in our bookkeeping */
 		goto skip_fsfstatus;
 	}

 	/* evaluate FSF status in QTCB */
 	switch (header->fsf_status) {

 	case FSF_PORT_HANDLE_NOT_VALID:
 		ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
 			      "(adapter %s, port 0x%016Lx). "
 			      "This may happen occasionally.\n",
 			      port->handle,
 			      zfcp_get_busid_by_port(port),
 			      port->wwpn);
 		ZFCP_LOG_DEBUG("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_phand_nv");
 		zfcp_erp_adapter_reopen(port->adapter, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_ACCESS_DENIED:
 		ZFCP_LOG_NORMAL("Access denied, cannot close "
 				"physical port 0x%016Lx on adapter %s\n",
 				port->wwpn, zfcp_get_busid_by_port(port));
 		for (counter = 0; counter < 2; counter++) {
 			subtable = header->fsf_status_qual.halfword[counter * 2];
 			rule = header->fsf_status_qual.halfword[counter * 2 + 1];
 			switch (subtable) {
 			case FSF_SQ_CFDC_SUBTABLE_OS:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
 			case FSF_SQ_CFDC_SUBTABLE_LUN:
 	       			ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
 					zfcp_act_subtable_type[subtable], rule);
 				break;
 			}
 		}
 		debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
 		zfcp_erp_port_access_denied(port);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PORT_BOXED:
 		ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
 			       "%s needs to be reopened but it was attempted "
 			       "to close it physically.\n",
 			       port->wwpn,
 			       zfcp_get_busid_by_port(port));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_pboxed");
 		zfcp_erp_port_reopen(port, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 			ZFCP_STATUS_FSFREQ_RETRY;
 		break;

 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		switch (header->fsf_status_qual.word[0]) {
 		case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ltest");
 			/* This will now be escalated by ERP */
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			/* ERP strategy will escalate */
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ulp");
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		default:
 			ZFCP_LOG_NORMAL
 			    ("bug: Wrong status qualifier 0x%x arrived.\n",
 			     header->fsf_status_qual.word[0]);
 			debug_text_event(fsf_req->adapter->erp_dbf, 0,
 					 "fsf_sq_inval:");
 			debug_exception(
 				fsf_req->adapter->erp_dbf, 0,
 				&header->fsf_status_qual.word[0], sizeof (u32));
 			break;
 		}
 		break;

 	case FSF_GOOD:
 		ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
 			       "physically closed, port handle 0x%x\n",
 			       port->wwpn,
 			       zfcp_get_busid_by_port(port), port->handle);
 		/* 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);
 		retval = 0;
 		break;

 	default:
 		ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
 				"(debug info 0x%x)\n",
 				header->fsf_status);
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
 		debug_exception(fsf_req->adapter->erp_dbf, 0,
 				&header->fsf_status, sizeof (u32));
 		break;
 	}

  skip_fsfstatus:
 	atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_open_unit
  *
  * purpose:
  *
  * returns:
  *
  * assumptions:	This routine does not check whether the associated
  *		remote port has already been opened. This should be
  *		done by calling routines. Otherwise some status
  *		may be presented by FSF
  */
 int
 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
 {
 	volatile struct qdio_buffer_element *sbale;
 	unsigned long lock_flags;
 	int retval = 0;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(erp_action->adapter,
 				     FSF_QTCB_OPEN_LUN,
 				     ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
 				     erp_action->adapter->pool.fsf_req_erp,
 				     &lock_flags, &(erp_action->fsf_req));
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create open unit request for "
 			      "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
 			      erp_action->unit->fcp_lun,
 			      erp_action->unit->port->wwpn,
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
                                     erp_action->fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	erp_action->fsf_req->qtcb->header.port_handle =
 		erp_action->port->handle;
 	erp_action->fsf_req->qtcb->bottom.support.fcp_lun =
 		erp_action->unit->fcp_lun;
 	erp_action->fsf_req->qtcb->bottom.support.option =
 		FSF_OPEN_LUN_SUPPRESS_BOXING;
 	atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
 	erp_action->fsf_req->data.open_unit.unit = erp_action->unit;
 	erp_action->fsf_req->erp_action = erp_action;

 	/* start QDIO request for this FSF request */
 	retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
 	if (retval) {
 		ZFCP_LOG_INFO("error: Could not send an open unit request "
 			      "on the adapter %s, port 0x%016Lx for "
 			      "unit 0x%016Lx\n",
 			      zfcp_get_busid_by_adapter(erp_action->adapter),
 			      erp_action->port->wwpn,
 			      erp_action->unit->fcp_lun);
 		zfcp_fsf_req_free(erp_action->fsf_req);
 		erp_action->fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
 		       "port 0x%016Lx, unit 0x%016Lx)\n",
 		       zfcp_get_busid_by_adapter(erp_action->adapter),
 		       erp_action->port->wwpn, erp_action->unit->fcp_lun);
  out:
 	write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
 				lock_flags);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_open_unit_handler
  *
  * purpose:	is called for finished Open LUN command
  *
  * returns:
  */
 static int
 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = -EINVAL;
 	struct zfcp_adapter *adapter;
 	struct zfcp_unit *unit;
 	struct fsf_qtcb_header *header;
 	struct fsf_qtcb_bottom_support *bottom;
 	struct fsf_queue_designator *queue_designator;
 	u16 subtable, rule, counter;
 	u32 allowed, exclusive, readwrite;

 	unit = fsf_req->data.open_unit.unit;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		/* don't change unit status in our bookkeeping */
 		goto skip_fsfstatus;
 	}

 	adapter = fsf_req->adapter;
 	header = &fsf_req->qtcb->header;
 	bottom = &fsf_req->qtcb->bottom.support;
 	queue_designator = &header->fsf_status_qual.fsf_queue_designator;

 	allowed   = bottom->lun_access_info & FSF_UNIT_ACCESS_OPEN_LUN_ALLOWED;
 	exclusive = bottom->lun_access_info & FSF_UNIT_ACCESS_EXCLUSIVE;
 	readwrite = bottom->lun_access_info & FSF_UNIT_ACCESS_OUTBOUND_TRANSFER;

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

 	/* evaluate FSF status in QTCB */
 	switch (header->fsf_status) {

 	case FSF_PORT_HANDLE_NOT_VALID:
 		ZFCP_LOG_INFO("Temporary port identifier 0x%x "
 			      "for port 0x%016Lx on adapter %s invalid "
 			      "This may happen occasionally\n",
 			      unit->port->handle,
 			      unit->port->wwpn, zfcp_get_busid_by_unit(unit));
 		ZFCP_LOG_DEBUG("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(adapter->erp_dbf, 1, "fsf_s_ph_nv");
 		zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_LUN_ALREADY_OPEN:
 		ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
 				"remote port 0x%016Lx on adapter %s twice.\n",
 				unit->fcp_lun,
 				unit->port->wwpn, zfcp_get_busid_by_unit(unit));
 		debug_text_exception(adapter->erp_dbf, 0,
 				     "fsf_s_uopen");
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_ACCESS_DENIED:
 		ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
 				"remote port 0x%016Lx on adapter %s\n",
 				unit->fcp_lun, unit->port->wwpn,
 				zfcp_get_busid_by_unit(unit));
 		for (counter = 0; counter < 2; counter++) {
 			subtable = header->fsf_status_qual.halfword[counter * 2];
 			rule = header->fsf_status_qual.halfword[counter * 2 + 1];
 			switch (subtable) {
 			case FSF_SQ_CFDC_SUBTABLE_OS:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
 			case FSF_SQ_CFDC_SUBTABLE_LUN:
 				ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
 					zfcp_act_subtable_type[subtable], rule);
 				break;
 			}
 		}
 		debug_text_event(adapter->erp_dbf, 1, "fsf_s_access");
 		zfcp_erp_unit_access_denied(unit);
 		atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PORT_BOXED:
 		ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
 			       "needs to be reopened\n",
 			       unit->port->wwpn, zfcp_get_busid_by_unit(unit));
 		debug_text_event(adapter->erp_dbf, 2, "fsf_s_pboxed");
 		zfcp_erp_port_reopen(unit->port, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 			ZFCP_STATUS_FSFREQ_RETRY;
 		break;

 	case FSF_LUN_SHARING_VIOLATION:
 		if (header->fsf_status_qual.word[0] != 0) {
 			ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
 					"with WWPN 0x%Lx "
 					"connected to the adapter %s "
 					"is already in use in LPAR%d, CSS%d\n",
 					unit->fcp_lun,
 					unit->port->wwpn,
 					zfcp_get_busid_by_unit(unit),
 					queue_designator->hla,
 					queue_designator->cssid);
 		} else {
 			subtable = header->fsf_status_qual.halfword[4];
 			rule = header->fsf_status_qual.halfword[5];
 			switch (subtable) {
 			case FSF_SQ_CFDC_SUBTABLE_OS:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
 			case FSF_SQ_CFDC_SUBTABLE_LUN:
 				ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
 						"remote port with WWPN 0x%Lx "
 						"connected to the adapter %s "
 						"is denied (%s rule %d)\n",
 						unit->fcp_lun,
 						unit->port->wwpn,
 						zfcp_get_busid_by_unit(unit),
 						zfcp_act_subtable_type[subtable],
 						rule);
 				break;
 			}
 		}
 		ZFCP_LOG_DEBUG("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(adapter->erp_dbf, 2,
 				 "fsf_s_l_sh_vio");
 		zfcp_erp_unit_access_denied(unit);
 		atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
 		atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
 		ZFCP_LOG_INFO("error: The adapter ran out of resources. "
 			      "There is no handle (temporary port identifier) "
 			      "available for unit 0x%016Lx on port 0x%016Lx "
 			      "on adapter %s\n",
 			      unit->fcp_lun,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit));
 		debug_text_event(adapter->erp_dbf, 1,
 				 "fsf_s_max_units");
 		zfcp_erp_unit_failed(unit);
 		fsf_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:
 			/* Re-establish link to port */
 			debug_text_event(adapter->erp_dbf, 1,
 					 "fsf_sq_ltest");
 			zfcp_test_link(unit->port);
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			/* ERP strategy will escalate */
 			debug_text_event(adapter->erp_dbf, 1,
 					 "fsf_sq_ulp");
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		default:
 			ZFCP_LOG_NORMAL
 			    ("bug: Wrong status qualifier 0x%x arrived.\n",
 			     header->fsf_status_qual.word[0]);
 			debug_text_event(adapter->erp_dbf, 0,
 					 "fsf_sq_inval:");
 			debug_exception(adapter->erp_dbf, 0,
 					&header->fsf_status_qual.word[0],
 				sizeof (u32));
 		}
 		break;

 	case FSF_INVALID_COMMAND_OPTION:
 		ZFCP_LOG_NORMAL(
 			"Invalid option 0x%x has been specified "
 			"in QTCB bottom sent to the adapter %s\n",
 			bottom->option,
 			zfcp_get_busid_by_adapter(adapter));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EINVAL;
 		break;

 	case FSF_GOOD:
 		/* save LUN handle assigned by FSF */
 		unit->handle = header->lun_handle;
 		ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
 			       "adapter %s opened, port handle 0x%x\n",
 			       unit->fcp_lun,
 			       unit->port->wwpn,
 			       zfcp_get_busid_by_unit(unit),
 			       unit->handle);
 		/* mark unit as open */
 		atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);

 		if (adapter->supported_features & FSF_FEATURE_LUN_SHARING){
 			if (!exclusive)
 		                atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
 						&unit->status);

 			if (!readwrite) {
                 		atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
 						&unit->status);
                 		ZFCP_LOG_NORMAL("read-only access for unit "
 						"(adapter %s, wwpn=0x%016Lx, "
 						"fcp_lun=0x%016Lx)\n",
 						zfcp_get_busid_by_unit(unit),
 						unit->port->wwpn,
 						unit->fcp_lun);
         		}

         		if (exclusive && !readwrite) {
                 		ZFCP_LOG_NORMAL("exclusive access of read-only "
 						"unit not supported\n");
 				zfcp_erp_unit_failed(unit);
 				fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 				zfcp_erp_unit_shutdown(unit, 0);
         		} else if (!exclusive && readwrite) {
                 		ZFCP_LOG_NORMAL("shared access of read-write "
 						"unit not supported\n");
                 		zfcp_erp_unit_failed(unit);
 				fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 				zfcp_erp_unit_shutdown(unit, 0);
         		}
 		}

 		retval = 0;
 		break;

 	default:
 		ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
 				"(debug info 0x%x)\n",
 				header->fsf_status);
 		debug_text_event(adapter->erp_dbf, 0, "fsf_s_inval:");
 		debug_exception(adapter->erp_dbf, 0,
 				&header->fsf_status, sizeof (u32));
 		break;
 	}

  skip_fsfstatus:
 	atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_close_unit
  *
  * purpose:
  *
  * returns:	address of fsf_req - request successfully initiated
  *		NULL -
  *
  * assumptions: This routine does not check whether the associated
  *              remote port/lun has already been opened. This should be
  *              done by calling routines. Otherwise some status
  *              may be presented by FSF
  */
 int
 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
 {
 	volatile struct qdio_buffer_element *sbale;
 	unsigned long lock_flags;
 	int retval = 0;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(erp_action->adapter,
 				     FSF_QTCB_CLOSE_LUN,
 				     ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
 				     erp_action->adapter->pool.fsf_req_erp,
 				     &lock_flags, &(erp_action->fsf_req));
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create close unit request for "
 			      "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
 			      erp_action->unit->fcp_lun,
 			      erp_action->port->wwpn,
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		goto out;
 	}

 	sbale = zfcp_qdio_sbale_req(erp_action->fsf_req,
                                     erp_action->fsf_req->sbal_curr, 0);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	erp_action->fsf_req->qtcb->header.port_handle =
 	    erp_action->port->handle;
 	erp_action->fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
 	atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
 	erp_action->fsf_req->data.close_unit.unit = erp_action->unit;
 	erp_action->fsf_req->erp_action = erp_action;

 	/* start QDIO request for this FSF request */
 	retval = zfcp_fsf_req_send(erp_action->fsf_req, &erp_action->timer);
 	if (retval) {
 		ZFCP_LOG_INFO("error: Could not send a close unit request for "
 			      "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
 			      erp_action->unit->fcp_lun,
 			      erp_action->port->wwpn,
 			      zfcp_get_busid_by_adapter(erp_action->adapter));
 		zfcp_fsf_req_free(erp_action->fsf_req);
 		erp_action->fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
 		       "port 0x%016Lx, unit 0x%016Lx)\n",
 		       zfcp_get_busid_by_adapter(erp_action->adapter),
 		       erp_action->port->wwpn, erp_action->unit->fcp_lun);
  out:
 	write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
 				lock_flags);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_close_unit_handler
  *
  * purpose:     is called for finished Close LUN FSF command
  *
  * returns:
  */
 static int
 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = -EINVAL;
 	struct zfcp_unit *unit;

 	unit = fsf_req->data.close_unit.unit;	/* restore unit */

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		/* don't change unit status in our bookkeeping */
 		goto skip_fsfstatus;
 	}

 	/* evaluate FSF status in QTCB */
 	switch (fsf_req->qtcb->header.fsf_status) {

 	case FSF_PORT_HANDLE_NOT_VALID:
 		ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
 			      "0x%016Lx on adapter %s invalid. This may "
 			      "happen in rare circumstances\n",
 			      unit->port->handle,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit));
 		ZFCP_LOG_DEBUG("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &fsf_req->qtcb->header.fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_phand_nv");
 		zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 		zfcp_cmd_dbf_event_fsf("porthinv", fsf_req,
 				       &fsf_req->qtcb->header.fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_LUN_HANDLE_NOT_VALID:
 		ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
 			      "0x%016Lx on port 0x%016Lx on adapter %s is "
 			      "invalid. This may happen occasionally.\n",
 			      unit->handle,
 			      unit->fcp_lun,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit));
 		ZFCP_LOG_DEBUG("Status qualifier data:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &fsf_req->qtcb->header.fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_lhand_nv");
 		zfcp_erp_port_reopen(unit->port, 0);
 		zfcp_cmd_dbf_event_fsf("lunhinv", fsf_req,
 				       &fsf_req->qtcb->header.fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PORT_BOXED:
 		ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
 			       "needs to be reopened\n",
 			       unit->port->wwpn,
 			       zfcp_get_busid_by_unit(unit));
 		debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
 		zfcp_erp_port_reopen(unit->port, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 			ZFCP_STATUS_FSFREQ_RETRY;
 		break;

 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 		case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 			/* re-establish link to port */
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ltest");
 			zfcp_test_link(unit->port);
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			/* ERP strategy will escalate */
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ulp");
 			fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 			break;
 		default:
 			ZFCP_LOG_NORMAL
 			    ("bug: Wrong status qualifier 0x%x arrived.\n",
 			     fsf_req->qtcb->header.fsf_status_qual.word[0]);
 			debug_text_event(fsf_req->adapter->erp_dbf, 0,
 					 "fsf_sq_inval:");
 			debug_exception(
 				fsf_req->adapter->erp_dbf, 0,
 				&fsf_req->qtcb->header.fsf_status_qual.word[0],
 				sizeof (u32));
 			break;
 		}
 		break;

 	case FSF_GOOD:
 		ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
 			       "closed, port handle 0x%x\n",
 			       unit->fcp_lun,
 			       unit->port->wwpn,
 			       zfcp_get_busid_by_unit(unit),
 			       unit->handle);
 		/* mark unit as closed */
 		atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
 		retval = 0;
 		break;

 	default:
 		ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
 				"(debug info 0x%x)\n",
 				fsf_req->qtcb->header.fsf_status);
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
 		debug_exception(fsf_req->adapter->erp_dbf, 0,
 				&fsf_req->qtcb->header.fsf_status,
 				sizeof (u32));
 		break;
 	}

  skip_fsfstatus:
 	atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
 	return retval;
 }

 /**
  * 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,
 			       struct timer_list *timer, int req_flags)
 {
 	struct zfcp_fsf_req *fsf_req = NULL;
 	struct fcp_cmnd_iu *fcp_cmnd_iu;
 	unsigned int sbtype;
 	unsigned long lock_flags;
 	int real_bytes = 0;
 	int retval = 0;
 	int mask;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
 				     adapter->pool.fsf_req_scsi,
 				     &lock_flags, &fsf_req);
 	if (unlikely(retval < 0)) {
 		ZFCP_LOG_DEBUG("error: Could not create FCP command request "
 			       "for unit 0x%016Lx on port 0x%016Lx on "
 			       "adapter %s\n",
 			       unit->fcp_lun,
 			       unit->port->wwpn,
 			       zfcp_get_busid_by_adapter(adapter));
 		goto failed_req_create;
 	}

 	/*
 	 * associate FSF request with SCSI request
 	 * (need this for look up on abort)
 	 */
 	fsf_req->data.send_fcp_command_task.fsf_req = fsf_req;
 	scsi_cmnd->host_scribble = (char *) &(fsf_req->data);

 	/*
 	 * associate SCSI command with FSF request
 	 * (need this for look up on normal command completion)
 	 */
 	fsf_req->data.send_fcp_command_task.scsi_cmnd = scsi_cmnd;
 	fsf_req->data.send_fcp_command_task.start_jiffies = jiffies;
 	fsf_req->data.send_fcp_command_task.unit = unit;
 	ZFCP_LOG_DEBUG("unit=%p, fcp_lun=0x%016Lx\n", unit, unit->fcp_lun);

 	/* set handles of unit and its parent port in QTCB */
 	fsf_req->qtcb->header.lun_handle = unit->handle;
 	fsf_req->qtcb->header.port_handle = unit->port->handle;

 	/* FSF does not define the structure of the FCP_CMND IU */
 	fcp_cmnd_iu = (struct fcp_cmnd_iu *)
 	    &(fsf_req->qtcb->bottom.io.fcp_cmnd);

 	/*
 	 * 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:
 		fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
 		/*
 		 * FIXME(qdio):
 		 * what is the correct type for commands
 		 * without 'real' data buffers?
 		 */
 		sbtype = SBAL_FLAGS0_TYPE_READ;
 		break;
 	case DMA_FROM_DEVICE:
 		fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
 		sbtype = SBAL_FLAGS0_TYPE_READ;
 		fcp_cmnd_iu->rddata = 1;
 		break;
 	case DMA_TO_DEVICE:
 		fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
 		sbtype = SBAL_FLAGS0_TYPE_WRITE;
 		fcp_cmnd_iu->wddata = 1;
 		break;
 	case DMA_BIDIRECTIONAL:
 	default:
 		/*
 		 * dummy, catch this condition earlier
 		 * in zfcp_scsi_queuecommand
 		 */
 		goto failed_scsi_cmnd;
 	}

 	/* set FC service class in QTCB (3 per default) */
 	fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;

 	/* set FCP_LUN in FCP_CMND IU in QTCB */
 	fcp_cmnd_iu->fcp_lun = unit->fcp_lun;

 	mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;

 	/* set task attributes in FCP_CMND IU in QTCB */
 	if (likely((scsi_cmnd->device->simple_tags) ||
 		   (atomic_test_mask(mask, &unit->status))))
 		fcp_cmnd_iu->task_attribute = SIMPLE_Q;
 	else
 		fcp_cmnd_iu->task_attribute = UNTAGGED;

 	/* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
 	if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
 		fcp_cmnd_iu->add_fcp_cdb_length
 		    = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
 		ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
 			       "additional FCP_CDB length is 0x%x "
 			       "(shifted right 2 bits)\n",
 			       scsi_cmnd->cmd_len,
 			       fcp_cmnd_iu->add_fcp_cdb_length);
 	}
 	/*
 	 * copy SCSI CDB (including additional length, if any) to
 	 * FCP_CDB in FCP_CMND IU in QTCB
 	 */
 	memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);

 	/* FCP CMND IU length in QTCB */
 	fsf_req->qtcb->bottom.io.fcp_cmnd_length =
 		sizeof (struct fcp_cmnd_iu) +
 		fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);

 	/* generate SBALEs from data buffer */
 	real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
 	if (unlikely(real_bytes < 0)) {
 		if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
 			ZFCP_LOG_DEBUG(
 				"Data did not fit into available buffer(s), "
 			       "waiting for more...\n");
 		retval = -EIO;
 	} else {
 		ZFCP_LOG_NORMAL("error: No truncation implemented but "
 				"required. Shutting down unit "
 				"(adapter %s, port 0x%016Lx, "
 				"unit 0x%016Lx)\n",
 				zfcp_get_busid_by_unit(unit),
 				unit->port->wwpn,
 				unit->fcp_lun);
 		zfcp_erp_unit_shutdown(unit, 0);
 		retval = -EINVAL;
 		}
 		goto no_fit;
 	}

 	/* set length of FCP data length in FCP_CMND IU in QTCB */
 	zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);

 	ZFCP_LOG_DEBUG("Sending SCSI command:\n");
 	ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 		      (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);

 	/*
 	 * start QDIO request for this FSF request
 	 *  covered by an SBALE)
 	 */
 	retval = zfcp_fsf_req_send(fsf_req, timer);
 	if (unlikely(retval < 0)) {
 		ZFCP_LOG_INFO("error: Could not send FCP command request "
 			      "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      unit->port->wwpn,
 			      unit->fcp_lun);
 		goto send_failed;
 	}

 	ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
 		       "port 0x%016Lx, unit 0x%016Lx)\n",
 		       zfcp_get_busid_by_adapter(adapter),
 		       unit->port->wwpn,
 		       unit->fcp_lun);
 	goto success;

  send_failed:
  no_fit:
  failed_scsi_cmnd:
 	zfcp_fsf_req_free(fsf_req);
 	fsf_req = NULL;
 	scsi_cmnd->host_scribble = NULL;
  success:
  failed_req_create:
 	write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_send_fcp_command_task_management
  *
  * purpose:
  *
  * returns:
  *
  * FIXME(design): should be watched by a timeout!!!
  * FIXME(design) shouldn't this be modified to return an int
  *               also...don't know how though
  *
  */
 struct zfcp_fsf_req *
 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
 					  struct zfcp_unit *unit,
 					  u8 tm_flags, int req_flags)
 {
 	struct zfcp_fsf_req *fsf_req = NULL;
 	int retval = 0;
 	struct fcp_cmnd_iu *fcp_cmnd_iu;
 	unsigned long lock_flags;
 	volatile struct qdio_buffer_element *sbale;

 	/* setup new FSF request */
 	retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
 				     adapter->pool.fsf_req_scsi,
 				     &lock_flags, &fsf_req);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create FCP command (task "
 			      "management) request for adapter %s, port "
 			      " 0x%016Lx, unit 0x%016Lx.\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      unit->port->wwpn, unit->fcp_lun);
 		goto out;
 	}

 	/*
 	 * Used to decide on proper handler in the return path,
 	 * could be either zfcp_fsf_send_fcp_command_task_handler or
 	 * zfcp_fsf_send_fcp_command_task_management_handler */

 	fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;

 	/*
 	 * hold a pointer to the unit being target of this
 	 * task management request
 	 */
 	fsf_req->data.send_fcp_command_task_management.unit = unit;

 	/* set FSF related fields in QTCB */
 	fsf_req->qtcb->header.lun_handle = unit->handle;
 	fsf_req->qtcb->header.port_handle = unit->port->handle;
 	fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
 	fsf_req->qtcb->bottom.io.service_class = adapter->fc_service_class;
 	fsf_req->qtcb->bottom.io.fcp_cmnd_length =
 		sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 	sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
 	sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	/* set FCP related fields in FCP_CMND IU in QTCB */
 	fcp_cmnd_iu = (struct fcp_cmnd_iu *)
 		&(fsf_req->qtcb->bottom.io.fcp_cmnd);
 	fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
 	fcp_cmnd_iu->task_management_flags = tm_flags;

 	/* start QDIO request for this FSF request */
 	zfcp_fsf_start_scsi_er_timer(adapter);
 	retval = zfcp_fsf_req_send(fsf_req, NULL);
 	if (retval) {
 		del_timer(&adapter->scsi_er_timer);
 		ZFCP_LOG_INFO("error: Could not send an FCP-command (task "
 			      "management) on adapter %s, port 0x%016Lx for "
 			      "unit LUN 0x%016Lx\n",
 			      zfcp_get_busid_by_adapter(adapter),
 			      unit->port->wwpn,
 			      unit->fcp_lun);
 		zfcp_fsf_req_free(fsf_req);
 		fsf_req = NULL;
 		goto out;
 	}

 	ZFCP_LOG_TRACE("Send FCP Command (task management function) initiated "
 		       "(adapter %s, port 0x%016Lx, unit 0x%016Lx, "
 		       "tm_flags=0x%x)\n",
 		       zfcp_get_busid_by_adapter(adapter),
 		       unit->port->wwpn,
 		       unit->fcp_lun,
 		       tm_flags);
  out:
 	write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 	return fsf_req;
 }

 /*
  * function:    zfcp_fsf_send_fcp_command_handler
  *
  * purpose:	is called for finished Send FCP Command
  *
  * returns:
  */
 static int
 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = -EINVAL;
 	struct zfcp_unit *unit;
 	struct fsf_qtcb_header *header;
 	u16 subtable, rule, counter;

 	header = &fsf_req->qtcb->header;

 	if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
 		unit = fsf_req->data.send_fcp_command_task_management.unit;
 	else
 		unit = fsf_req->data.send_fcp_command_task.unit;

 	if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 		/* go directly to calls of special handlers */
 		goto skip_fsfstatus;
 	}

 	/* evaluate FSF status in QTCB */
 	switch (header->fsf_status) {

 	case FSF_PORT_HANDLE_NOT_VALID:
 		ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
 			      "0x%016Lx on adapter %s invalid\n",
 			      unit->port->handle,
 			      unit->port->wwpn, zfcp_get_busid_by_unit(unit));
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_phand_nv");
 		zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_LUN_HANDLE_NOT_VALID:
 		ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
 			      "0x%016Lx on port 0x%016Lx on adapter %s is "
 			      "invalid. This may happen occasionally.\n",
 			      unit->handle,
 			      unit->fcp_lun,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit));
 		ZFCP_LOG_NORMAL("Status qualifier data:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_uhand_nv");
 		zfcp_erp_port_reopen(unit->port, 0);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_HANDLE_MISMATCH:
 		ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
 				"unexpectedly. (adapter %s, port 0x%016Lx, "
 				"unit 0x%016Lx)\n",
 				unit->port->handle,
 				zfcp_get_busid_by_unit(unit),
 				unit->port->wwpn,
 				unit->fcp_lun);
 		ZFCP_LOG_NORMAL("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_hand_mis");
 		zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 		zfcp_cmd_dbf_event_fsf("handmism",
 				       fsf_req,
 				       &header->fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 		if (fsf_req->adapter->fc_service_class <= 3) {
 			ZFCP_LOG_NORMAL("error: The adapter %s does "
 					"not support fibrechannel class %d.\n",
 					zfcp_get_busid_by_unit(unit),
 					fsf_req->adapter->fc_service_class);
 		} else {
 			ZFCP_LOG_NORMAL("bug: The fibrechannel class at "
 					"adapter %s is invalid. "
 					"(debug info %d)\n",
 					zfcp_get_busid_by_unit(unit),
 					fsf_req->adapter->fc_service_class);
 		}
 		/* stop operation for this adapter */
 		debug_text_exception(fsf_req->adapter->erp_dbf, 0,
 				     "fsf_s_class_nsup");
 		zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
 		zfcp_cmd_dbf_event_fsf("unsclass",
 				       fsf_req,
 				       &header->fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_FCPLUN_NOT_VALID:
 		ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
 				"adapter %s does not have correct unit "
 				"handle 0x%x\n",
 				unit->fcp_lun,
 				unit->port->wwpn,
 				zfcp_get_busid_by_unit(unit),
 				unit->handle);
 		ZFCP_LOG_DEBUG("status qualifier:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (char *) &header->fsf_status_qual,
 			      sizeof (union fsf_status_qual));
 		debug_text_event(fsf_req->adapter->erp_dbf, 1,
 				 "fsf_s_fcp_lun_nv");
 		zfcp_erp_port_reopen(unit->port, 0);
 		zfcp_cmd_dbf_event_fsf("fluninv",
 				       fsf_req,
 				       &header->fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_ACCESS_DENIED:
 		ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
 				"unit 0x%016Lx on port 0x%016Lx on "
 				"adapter %s\n",	unit->fcp_lun, unit->port->wwpn,
 				zfcp_get_busid_by_unit(unit));
 		for (counter = 0; counter < 2; counter++) {
 			subtable = header->fsf_status_qual.halfword[counter * 2];
 			rule = header->fsf_status_qual.halfword[counter * 2 + 1];
 			switch (subtable) {
 			case FSF_SQ_CFDC_SUBTABLE_OS:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
 			case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
 			case FSF_SQ_CFDC_SUBTABLE_LUN:
 				ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
 					zfcp_act_subtable_type[subtable], rule);
 				break;
 			}
 		}
 		debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_access");
 		zfcp_erp_unit_access_denied(unit);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_DIRECTION_INDICATOR_NOT_VALID:
 		ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
 			      "0x%016Lx on port 0x%016Lx on adapter %s "
 			      "(debug info %d)\n",
 			      unit->fcp_lun,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit),
 			      fsf_req->qtcb->bottom.io.data_direction);
 		/* stop operation for this adapter */
 		debug_text_event(fsf_req->adapter->erp_dbf, 0,
 				 "fsf_s_dir_ind_nv");
 		zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
 		zfcp_cmd_dbf_event_fsf("dirinv",
 				       fsf_req,
 				       &header->fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_CMND_LENGTH_NOT_VALID:
 		ZFCP_LOG_NORMAL
 		    ("bug: An invalid control-data-block length field "
 		     "was found in a command for unit 0x%016Lx on port "
 		     "0x%016Lx on adapter %s " "(debug info %d)\n",
 		     unit->fcp_lun, unit->port->wwpn,
 		     zfcp_get_busid_by_unit(unit),
 		     fsf_req->qtcb->bottom.io.fcp_cmnd_length);
 		/* stop operation for this adapter */
 		debug_text_event(fsf_req->adapter->erp_dbf, 0,
 				 "fsf_s_cmd_len_nv");
 		zfcp_erp_adapter_shutdown(unit->port->adapter, 0);
 		zfcp_cmd_dbf_event_fsf("cleninv",
 				       fsf_req,
 				       &header->fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_PORT_BOXED:
 		ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
 			       "needs to be reopened\n",
 			       unit->port->wwpn, zfcp_get_busid_by_unit(unit));
 		debug_text_event(fsf_req->adapter->erp_dbf, 2, "fsf_s_pboxed");
 		zfcp_erp_port_reopen(unit->port, 0);
 		zfcp_cmd_dbf_event_fsf("portbox", fsf_req,
 				       &header->fsf_status_qual,
 				       sizeof (union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 			ZFCP_STATUS_FSFREQ_RETRY;
 		break;

 	case FSF_LUN_BOXED:
 		ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
 				"wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
 				zfcp_get_busid_by_unit(unit),
 				unit->port->wwpn, unit->fcp_lun);
 		debug_text_event(fsf_req->adapter->erp_dbf, 1, "fsf_s_lboxed");
 		zfcp_erp_unit_reopen(unit, 0);
 		zfcp_cmd_dbf_event_fsf("unitbox", fsf_req,
 				       &header->fsf_status_qual,
 				       sizeof(union fsf_status_qual));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
 			| ZFCP_STATUS_FSFREQ_RETRY;
 		break;

 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		switch (header->fsf_status_qual.word[0]) {
 		case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 			/* re-establish link to port */
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ltest");
  			zfcp_test_link(unit->port);
 			break;
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			/* FIXME(hw) need proper specs for proper action */
 			/* let scsi stack deal with retries and escalation */
 			debug_text_event(fsf_req->adapter->erp_dbf, 1,
 					 "fsf_sq_ulp");
 			break;
 		default:
 			ZFCP_LOG_NORMAL
  			    ("Unknown status qualifier 0x%x arrived.\n",
 			     header->fsf_status_qual.word[0]);
 			debug_text_event(fsf_req->adapter->erp_dbf, 0,
 					 "fsf_sq_inval:");
 			debug_exception(fsf_req->adapter->erp_dbf, 0,
 					&header->fsf_status_qual.word[0],
 					sizeof(u32));
 			break;
 		}
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;

 	case FSF_GOOD:
 		break;

 	case FSF_FCP_RSP_AVAILABLE:
 		break;

 	default:
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_s_inval:");
 		debug_exception(fsf_req->adapter->erp_dbf, 0,
 				&header->fsf_status, sizeof(u32));
 		break;
 	}

  skip_fsfstatus:
 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
 		retval =
 		    zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
 	} else {
 		retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
 	}
 	return retval;
 }

 /*
  * function:    zfcp_fsf_send_fcp_command_task_handler
  *
  * purpose:	evaluates FCP_RSP IU
  *
  * returns:
  */
 static int
 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = 0;
 	struct scsi_cmnd *scpnt;
 	struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
 	    &(fsf_req->qtcb->bottom.io.fcp_rsp);
 	struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
 	    &(fsf_req->qtcb->bottom.io.fcp_cmnd);
 	u32 sns_len;
 	char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
 	unsigned long flags;
 	struct zfcp_unit *unit = fsf_req->data.send_fcp_command_task.unit;

 	read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
 	scpnt = fsf_req->data.send_fcp_command_task.scsi_cmnd;
 	if (unlikely(!scpnt)) {
 		ZFCP_LOG_DEBUG
 		    ("Command with fsf_req %p is not associated to "
 		     "a scsi command anymore. Aborted?\n", fsf_req);
 		goto out;
 	}
 	if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
 		/* FIXME: (design) mid-layer should handle DID_ABORT like
 		 *        DID_SOFT_ERROR by retrying the request for devices
 		 *        that allow retries.
 		 */
 		ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
 		set_host_byte(&scpnt->result, DID_SOFT_ERROR);
 		set_driver_byte(&scpnt->result, SUGGEST_RETRY);
 		goto skip_fsfstatus;
 	}

 	if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 		ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
 		set_host_byte(&scpnt->result, DID_ERROR);
 		goto skip_fsfstatus;
 	}

 	/* set message byte of result in SCSI command */
 	scpnt->result |= COMMAND_COMPLETE << 8;

 	/*
 	 * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
 	 * of result in SCSI command
 	 */
 	scpnt->result |= fcp_rsp_iu->scsi_status;
 	if (unlikely(fcp_rsp_iu->scsi_status)) {
 		/* DEBUG */
 		ZFCP_LOG_DEBUG("status for SCSI Command:\n");
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      scpnt->cmnd, scpnt->cmd_len);
 		ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
 				fcp_rsp_iu->scsi_status);
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 			      zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
 			      fcp_rsp_iu->fcp_sns_len);
 	}

 	/* check FCP_RSP_INFO */
 	if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
 		ZFCP_LOG_DEBUG("rsp_len is valid\n");
 		switch (fcp_rsp_info[3]) {
 		case RSP_CODE_GOOD:
 			/* ok, continue */
 			ZFCP_LOG_TRACE("no failure or Task Management "
 				       "Function complete\n");
 			set_host_byte(&scpnt->result, DID_OK);
 			break;
 		case RSP_CODE_LENGTH_MISMATCH:
 			/* hardware bug */
 			ZFCP_LOG_NORMAL("bug: FCP response code indictates "
 					"that the fibrechannel protocol data "
 					"length differs from the burst length. "
 					"The problem occured on unit 0x%016Lx "
 					"on port 0x%016Lx on adapter %s",
 					unit->fcp_lun,
 					unit->port->wwpn,
 					zfcp_get_busid_by_unit(unit));
 			/* dump SCSI CDB as prepared by zfcp */
 			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 				      (char *) &fsf_req->qtcb->
 				      bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
 			zfcp_cmd_dbf_event_fsf("clenmis", fsf_req, NULL, 0);
 			set_host_byte(&scpnt->result, DID_ERROR);
 			goto skip_fsfstatus;
 		case RSP_CODE_FIELD_INVALID:
 			/* driver or hardware bug */
 			ZFCP_LOG_NORMAL("bug: FCP response code indictates "
 					"that the fibrechannel protocol data "
 					"fields were incorrectly set up. "
 					"The problem occured on the unit "
 					"0x%016Lx on port 0x%016Lx on "
 					"adapter %s",
 					unit->fcp_lun,
 					unit->port->wwpn,
 					zfcp_get_busid_by_unit(unit));
 			/* dump SCSI CDB as prepared by zfcp */
 			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 				      (char *) &fsf_req->qtcb->
 				      bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
 			set_host_byte(&scpnt->result, DID_ERROR);
 			zfcp_cmd_dbf_event_fsf("codeinv", fsf_req, NULL, 0);
 			goto skip_fsfstatus;
 		case RSP_CODE_RO_MISMATCH:
 			/* hardware bug */
 			ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
 					"that conflicting  values for the "
 					"fibrechannel payload offset from the "
 					"header were found. "
 					"The problem occured on unit 0x%016Lx "
 					"on port 0x%016Lx on adapter %s.\n",
 					unit->fcp_lun,
 					unit->port->wwpn,
 					zfcp_get_busid_by_unit(unit));
 			/* dump SCSI CDB as prepared by zfcp */
 			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 				      (char *) &fsf_req->qtcb->
 				      bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
 			zfcp_cmd_dbf_event_fsf("codemism", fsf_req, NULL, 0);
 			set_host_byte(&scpnt->result, DID_ERROR);
 			goto skip_fsfstatus;
 		default:
 			ZFCP_LOG_NORMAL("bug: An invalid FCP response "
 					"code was detected for a command. "
 					"The problem occured on the unit "
 					"0x%016Lx on port 0x%016Lx on "
 					"adapter %s (debug info 0x%x)\n",
 					unit->fcp_lun,
 					unit->port->wwpn,
 					zfcp_get_busid_by_unit(unit),
 					fcp_rsp_info[3]);
 			/* dump SCSI CDB as prepared by zfcp */
 			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
 				      (char *) &fsf_req->qtcb->
 				      bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
 			zfcp_cmd_dbf_event_fsf("undeffcp", fsf_req, NULL, 0);
 			set_host_byte(&scpnt->result, DID_ERROR);
 			goto skip_fsfstatus;
 		}
 	}

 	/* check for sense data */
 	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;
 		ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
 			       sns_len);
 		sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
 		ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
 			       SCSI_SENSE_BUFFERSIZE);
 		sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
 		ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
 			       scpnt->result);
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 			      (void *) &scpnt->cmnd, scpnt->cmd_len);

 		ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
 			       fcp_rsp_iu->fcp_sns_len);
 		memcpy(&scpnt->sense_buffer,
 		       zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
 		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
 			      (void *) &scpnt->sense_buffer, sns_len);
 	}

 	/* check for overrun */
 	if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
 		ZFCP_LOG_INFO("A data overrun was detected for a command. "
 			      "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
 			      "The response data length is "
 			      "%d, the original length was %d.\n",
 			      unit->fcp_lun,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit),
 			      fcp_rsp_iu->fcp_resid,
 			      (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
 	}

 	/* check for underrun */
 	if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
 		ZFCP_LOG_INFO("A data underrun was detected for a command. "
 			      "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
 			      "The response data length is "
 			      "%d, the original length was %d.\n",
 			      unit->fcp_lun,
 			      unit->port->wwpn,
 			      zfcp_get_busid_by_unit(unit),
 			      fcp_rsp_iu->fcp_resid,
 			      (int) zfcp_get_fcp_dl(fcp_cmnd_iu));

 		scpnt->resid = fcp_rsp_iu->fcp_resid;
 		if (scpnt->request_bufflen - scpnt->resid < scpnt->underflow)
 			set_host_byte(&scpnt->result, DID_ERROR);
 	}

  skip_fsfstatus:
 	ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);

 	zfcp_cmd_dbf_event_scsi("response", scpnt);

 	/* cleanup pointer (need this especially for abort) */
 	scpnt->host_scribble = NULL;

 	/*
 	 * NOTE:
 	 * according to the outcome of a discussion on linux-scsi we
 	 * don't need to grab the io_request_lock here since we use
 	 * the new eh
 	 */
 	/* always call back */

 	(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!
 	 */
  out:
 	read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
 	return retval;
 }

 /*
  * function:    zfcp_fsf_send_fcp_command_task_management_handler
  *
  * purpose:	evaluates FCP_RSP IU
  *
  * returns:
  */
 static int
 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
 {
 	int retval = 0;
 	struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
 	    &(fsf_req->qtcb->bottom.io.fcp_rsp);
 	char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
 	struct zfcp_unit *unit =
 	    fsf_req->data.send_fcp_command_task_management.unit;

 	del_timer(&fsf_req->adapter->scsi_er_timer);
 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
 		goto skip_fsfstatus;
 	}

 	/* check FCP_RSP_INFO */
 	switch (fcp_rsp_info[3]) {
 	case RSP_CODE_GOOD:
 		/* ok, continue */
 		ZFCP_LOG_DEBUG("no failure or Task Management "
 			       "Function complete\n");
 		break;
 	case RSP_CODE_TASKMAN_UNSUPP:
 		ZFCP_LOG_NORMAL("bug: A reuested task management function "
 				"is not supported on the target device "
 				"unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
 				unit->fcp_lun,
 				unit->port->wwpn,
 				zfcp_get_busid_by_unit(unit));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
 		break;
 	case RSP_CODE_TASKMAN_FAILED:
 		ZFCP_LOG_NORMAL("bug: A reuested task management function "
 				"failed to complete successfully. "
 				"unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
 				unit->fcp_lun,
 				unit->port->wwpn,
 				zfcp_get_busid_by_unit(unit));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
 		break;
 	default:
 		ZFCP_LOG_NORMAL("bug: An invalid FCP response "
 				"code was detected for a command. "
 				"unit 0x%016Lx, port 0x%016Lx, adapter %s "
 				"(debug info 0x%x)\n",
 				unit->fcp_lun,
 				unit->port->wwpn,
 				zfcp_get_busid_by_unit(unit),
 				fcp_rsp_info[3]);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
 	}

       skip_fsfstatus:
 	return retval;
 }


 /*
  * function:    zfcp_fsf_control_file
  *
  * purpose:     Initiator of the control file upload/download FSF requests
  *
  * returns:     0           - FSF request is successfuly created and queued
  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
  *              -EINVAL     - Invalid direction specified
  *              -ENOMEM     - Insufficient memory
  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
  */
 int
 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
                       struct zfcp_fsf_req **fsf_req_ptr,
                       u32 fsf_command,
                       u32 option,
                       struct zfcp_sg_list *sg_list)
 {
 	struct zfcp_fsf_req *fsf_req;
 	struct fsf_qtcb_bottom_support *bottom;
 	volatile struct qdio_buffer_element *sbale;
 	struct timer_list *timer;
 	unsigned long lock_flags;
 	int req_flags = 0;
 	int direction;
 	int retval = 0;

 	if (!(adapter->supported_features & FSF_FEATURE_CFDC)) {
 		ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		retval = -EOPNOTSUPP;
 		goto out;
 	}

 	switch (fsf_command) {

 	case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 		direction = SBAL_FLAGS0_TYPE_WRITE;
 		if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
 		    (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
 			req_flags = ZFCP_WAIT_FOR_SBAL;
 		break;

 	case FSF_QTCB_UPLOAD_CONTROL_FILE:
 		direction = SBAL_FLAGS0_TYPE_READ;
 		break;

 	default:
 		ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
 		retval = -EINVAL;
 		goto out;
 	}

 	timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
 	if (!timer) {
 		retval = -ENOMEM;
 		goto out;
  	}

 	retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
 				     NULL, &lock_flags, &fsf_req);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("error: Could not create FSF request for the "
 			      "adapter %s\n",
 			zfcp_get_busid_by_adapter(adapter));
 		retval = -EPERM;
 		goto unlock_queue_lock;
 	}

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 	sbale[0].flags |= direction;

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

 	if (sg_list->count > 0) {
 		int bytes;

 		bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
 						sg_list->sg, sg_list->count,
 						ZFCP_MAX_SBALS_PER_REQ);
                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
 			ZFCP_LOG_INFO(
 				"error: Could not create sufficient number of "
 				"SBALS for an FSF request to the adapter %s\n",
 				zfcp_get_busid_by_adapter(adapter));
 			retval = -ENOMEM;
 			goto free_fsf_req;
 		}
 	} else
 		sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

 	init_timer(timer);
 	timer->function = zfcp_fsf_request_timeout_handler;
 	timer->data = (unsigned long) adapter;
 	timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;

 	retval = zfcp_fsf_req_send(fsf_req, timer);
 	if (retval < 0) {
 		ZFCP_LOG_INFO("initiation of cfdc up/download failed"
 			      "(adapter %s)\n",
 			      zfcp_get_busid_by_adapter(adapter));
 		retval = -EPERM;
 		goto free_fsf_req;
 	}
 	write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);

 	ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
 			"adapter %s\n",
 			fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
 			"download" : "upload",
 			zfcp_get_busid_by_adapter(adapter));

 	wait_event(fsf_req->completion_wq,
 	           fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);

 	*fsf_req_ptr = fsf_req;
 	del_timer_sync(timer);
 	goto free_timer;

  free_fsf_req:
 	zfcp_fsf_req_free(fsf_req);
  unlock_queue_lock:
 	write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
  free_timer:
 	kfree(timer);
  out:
 	return retval;
 }


 /*
  * function:    zfcp_fsf_control_file_handler
  *
  * purpose:     Handler of the control file upload/download FSF requests
  *
  * returns:     0       - FSF request successfuly processed
  *              -EAGAIN - Operation has to be repeated because of a temporary problem
  *              -EACCES - There is no permission to execute an operation
  *              -EPERM  - The control file is not in a right format
  *              -EIO    - There is a problem with the FCP adapter
  *              -EINVAL - Invalid operation
  *              -EFAULT - User space memory I/O operation fault
  */
 static int
 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
 {
 	struct zfcp_adapter *adapter = fsf_req->adapter;
 	struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
 	struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
 	int retval = 0;

 	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 		retval = -EINVAL;
 		goto skip_fsfstatus;
 	}

 	switch (header->fsf_status) {

 	case FSF_GOOD:
 		ZFCP_LOG_NORMAL(
 			"The FSF request has been successfully completed "
 			"on the adapter %s\n",
 			zfcp_get_busid_by_adapter(adapter));
 		break;

 	case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
 		if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
 			switch (header->fsf_status_qual.word[0]) {

 			case FSF_SQ_CFDC_HARDENED_ON_SE:
 				ZFCP_LOG_NORMAL(
 					"CFDC on the adapter %s has being "
 					"hardened on primary and secondary SE\n",
 					zfcp_get_busid_by_adapter(adapter));
 				break;

 			case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
 				ZFCP_LOG_NORMAL(
 					"CFDC of the adapter %s could not "
 					"be saved on the SE\n",
 					zfcp_get_busid_by_adapter(adapter));
 				break;

 			case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
 				ZFCP_LOG_NORMAL(
 					"CFDC of the adapter %s could not "
 					"be copied to the secondary SE\n",
 					zfcp_get_busid_by_adapter(adapter));
 				break;

 			default:
 				ZFCP_LOG_NORMAL(
 					"CFDC could not be hardened "
 					"on the adapter %s\n",
 					zfcp_get_busid_by_adapter(adapter));
 			}
 		}
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EAGAIN;
 		break;

 	case FSF_AUTHORIZATION_FAILURE:
 		ZFCP_LOG_NORMAL(
 			"Adapter %s does not accept privileged commands\n",
 			zfcp_get_busid_by_adapter(adapter));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EACCES;
 		break;

 	case FSF_CFDC_ERROR_DETECTED:
 		ZFCP_LOG_NORMAL(
 			"Error at position %d in the CFDC, "
 			"CFDC is discarded by the adapter %s\n",
 			header->fsf_status_qual.word[0],
 			zfcp_get_busid_by_adapter(adapter));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EPERM;
 		break;

 	case FSF_CONTROL_FILE_UPDATE_ERROR:
 		ZFCP_LOG_NORMAL(
 			"Adapter %s cannot harden the control file, "
 			"file is discarded\n",
 			zfcp_get_busid_by_adapter(adapter));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EIO;
 		break;

 	case FSF_CONTROL_FILE_TOO_LARGE:
 		ZFCP_LOG_NORMAL(
 			"Control file is too large, file is discarded "
 			"by the adapter %s\n",
 			zfcp_get_busid_by_adapter(adapter));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EIO;
 		break;

 	case FSF_ACCESS_CONFLICT_DETECTED:
 		if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
 			ZFCP_LOG_NORMAL(
 				"CFDC has been discarded by the adapter %s, "
 				"because activation would impact "
 				"%d active connection(s)\n",
 				zfcp_get_busid_by_adapter(adapter),
 				header->fsf_status_qual.word[0]);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EIO;
 		break;

 	case FSF_CONFLICTS_OVERRULED:
 		if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
 			ZFCP_LOG_NORMAL(
 				"CFDC has been activated on the adapter %s, "
 				"but activation has impacted "
 				"%d active connection(s)\n",
 				zfcp_get_busid_by_adapter(adapter),
 				header->fsf_status_qual.word[0]);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EIO;
 		break;

 	case FSF_UNKNOWN_OP_SUBTYPE:
 		ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
 				"op_subtype=0x%x)\n",
 				zfcp_get_busid_by_adapter(adapter),
 				bottom->operation_subtype);
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EINVAL;
 		break;

 	case FSF_INVALID_COMMAND_OPTION:
 		ZFCP_LOG_NORMAL(
 			"Invalid option 0x%x has been specified "
 			"in QTCB bottom sent to the adapter %s\n",
 			bottom->option,
 			zfcp_get_busid_by_adapter(adapter));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EINVAL;
 		break;

 	default:
 		ZFCP_LOG_NORMAL(
 			"bug: An unknown/unexpected FSF status 0x%08x "
 			"was presented on the adapter %s\n",
 			header->fsf_status,
 			zfcp_get_busid_by_adapter(adapter));
 		debug_text_event(fsf_req->adapter->erp_dbf, 0, "fsf_sq_inval");
 		debug_exception(fsf_req->adapter->erp_dbf, 0,
 			&header->fsf_status_qual.word[0], sizeof(u32));
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		retval = -EINVAL;
 		break;
 	}

 skip_fsfstatus:
 	return retval;
 }


 /*
  * function:    zfcp_fsf_req_wait_and_cleanup
  *
  * purpose:
  *
  * FIXME(design): signal seems to be <0 !!!
  * returns:	0	- request completed (*status is valid), cleanup succ.
  *		<0	- request completed (*status is valid), cleanup failed
  *		>0	- signal which interrupted waiting (*status invalid),
  *			  request not completed, no cleanup
  *
  *		*status is a copy of status of completed fsf_req
  */
 int
 zfcp_fsf_req_wait_and_cleanup(struct zfcp_fsf_req *fsf_req,
 			      int interruptible, u32 * status)
 {
 	int retval = 0;
 	int signal = 0;

 	if (interruptible) {
 		__wait_event_interruptible(fsf_req->completion_wq,
 					   fsf_req->status &
 					   ZFCP_STATUS_FSFREQ_COMPLETED,
 					   signal);
 		if (signal) {
 			ZFCP_LOG_DEBUG("Caught signal %i while waiting for the "
 				       "completion of the request at %p\n",
 				       signal, fsf_req);
 			retval = signal;
 			goto out;
 		}
 	} else {
 		__wait_event(fsf_req->completion_wq,
 			     fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 	}

 	*status = fsf_req->status;

 	/* cleanup request */
 	zfcp_fsf_req_cleanup(fsf_req);
  out:
 	return retval;
 }

 static inline int
 zfcp_fsf_req_sbal_check(unsigned long *flags,
 			struct zfcp_qdio_queue *queue, int needed)
 {
 	write_lock_irqsave(&queue->queue_lock, *flags);
 	if (likely(atomic_read(&queue->free_count) >= needed))
 		return 1;
 	write_unlock_irqrestore(&queue->queue_lock, *flags);
 	return 0;
 }

 /*
  * set qtcb pointer in fsf_req and initialize QTCB
  */
 static inline void
 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req, u32 fsf_cmd)
 {
 	if (likely(fsf_req->qtcb != NULL)) {
 		fsf_req->qtcb->prefix.req_id = (unsigned long)fsf_req;
 		fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
 		fsf_req->qtcb->prefix.qtcb_type = fsf_qtcb_type[fsf_cmd];
 		fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
 		fsf_req->qtcb->header.req_handle = (unsigned long)fsf_req;
 		fsf_req->qtcb->header.fsf_command = fsf_cmd;
 	}
 }

 /**
  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
  * @adapter: adapter for which request queue is examined
  * @req_flags: flags indicating whether to wait for needed SBAL or not
  * @lock_flags: lock_flags if queue_lock is taken
  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
  * Locks: lock adapter->request_queue->queue_lock on success
  */
 static int
 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
 		      unsigned long *lock_flags)
 {
         long ret;
         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;

         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
                 ret = wait_event_interruptible_timeout(adapter->request_wq,
 			zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
 						       ZFCP_SBAL_TIMEOUT);
 		if (ret < 0)
 			return ret;
 		if (!ret)
 			return -EIO;
         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
                 return -EIO;

         return 0;
 }

 /*
  * function:    zfcp_fsf_req_create
  *
  * purpose:	create an FSF request at the specified adapter and
  *		setup common fields
  *
  * returns:	-ENOMEM if there was insufficient memory for a request
  *              -EIO if no qdio buffers could be allocate to the request
  *              -EINVAL/-EPERM on bug conditions in req_dequeue
  *              0 in success
  *
  * note:        The created request is returned by reference.
  *
  * locks:	lock of concerned request queue must not be held,
  *		but is held on completion (write, irqsave)
  */
 int
 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
 		    mempool_t *pool, unsigned long *lock_flags,
 		    struct zfcp_fsf_req **fsf_req_p)
 {
 	volatile struct qdio_buffer_element *sbale;
 	struct zfcp_fsf_req *fsf_req = NULL;
 	int ret = 0;
 	struct zfcp_qdio_queue *req_queue = &adapter->request_queue;

 	/* allocate new FSF request */
 	fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
 	if (unlikely(NULL == fsf_req)) {
 		ZFCP_LOG_DEBUG("error: Could not put an FSF request into"
 			       "the outbound (send) queue.\n");
 		ret = -ENOMEM;
 		goto failed_fsf_req;
 	}

         zfcp_fsf_req_qtcb_init(fsf_req, fsf_cmd);

 	/* initialize waitqueue which may be used to wait on
 	   this request completion */
 	init_waitqueue_head(&fsf_req->completion_wq);

         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
         if(ret < 0) {
                 goto failed_sbals;
 	}

 	/*
 	 * We hold queue_lock here. Check if QDIOUP is set and let request fail
 	 * if it is not set (see also *_open_qdio and *_close_qdio).
 	 */

 	if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
 		write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
 		ret = -EIO;
 		goto failed_sbals;
 	}

 	fsf_req->adapter = adapter;	/* pointer to "parent" adapter */
 	fsf_req->fsf_command = fsf_cmd;
 	fsf_req->sbal_number = 1;
 	fsf_req->sbal_first = req_queue->free_index;
 	fsf_req->sbal_curr = req_queue->free_index;
         fsf_req->sbale_curr = 1;

 	if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
 		fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
 	}

 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);

 	/* setup common SBALE fields */
 	sbale[0].addr = fsf_req;
 	sbale[0].flags |= SBAL_FLAGS0_COMMAND;
 	if (likely(fsf_req->qtcb != NULL)) {
 		sbale[1].addr = (void *) fsf_req->qtcb;
 		sbale[1].length = sizeof(struct fsf_qtcb);
 	}

 	ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
                        fsf_req->sbal_number, fsf_req->sbal_first);

 	goto success;

  failed_sbals:
 /* dequeue new FSF request previously enqueued */
 	zfcp_fsf_req_free(fsf_req);
 	fsf_req = NULL;

  failed_fsf_req:
 	write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
  success:
 	*fsf_req_p = fsf_req;
 	return ret;
 }

 /*
  * function:    zfcp_fsf_req_send
  *
  * purpose:	start transfer of FSF request via QDIO
  *
  * returns:	0 - request transfer succesfully started
  *		!0 - start of request transfer failed
  */
 static int
 zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req, struct timer_list *timer)
 {
 	struct zfcp_adapter *adapter;
 	struct zfcp_qdio_queue *req_queue;
 	volatile struct qdio_buffer_element *sbale;
 	int new_distance_from_int;
 	unsigned long flags;
 	int inc_seq_no = 1;
 	int retval = 0;

 	adapter = fsf_req->adapter;
 	req_queue = &adapter->request_queue,


 	/* FIXME(debug): remove it later */
 	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
 	ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
 	ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
 	ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
 		      sbale[1].length);

 	/* set sequence counter in QTCB */
 	if (likely(fsf_req->qtcb)) {
 		fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 		fsf_req->seq_no = adapter->fsf_req_seq_no;
 		ZFCP_LOG_TRACE("FSF request %p of adapter %s gets "
 			       "FSF sequence counter value of %i\n",
 			       fsf_req,
 			       zfcp_get_busid_by_adapter(adapter),
 			       fsf_req->qtcb->prefix.req_seq_no);
 	} else
 		inc_seq_no = 0;

 	/* put allocated FSF request at list tail */
 	write_lock_irqsave(&adapter->fsf_req_list_lock, flags);
 	list_add_tail(&fsf_req->list, &adapter->fsf_req_list_head);
 	write_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);

 	/* figure out expiration time of timeout and start timeout */
 	if (unlikely(timer)) {
 		timer->expires += jiffies;
 		add_timer(timer);
 	}

 	ZFCP_LOG_TRACE("request queue of adapter %s: "
 		       "next free SBAL is %i, %i free SBALs\n",
 		       zfcp_get_busid_by_adapter(adapter),
 		       req_queue->free_index,
 		       atomic_read(&req_queue->free_count));

 	ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
 		       "index_in_queue=%i, count=%i, buffers=%p\n",
 		       zfcp_get_busid_by_adapter(adapter),
 		       QDIO_FLAG_SYNC_OUTPUT,
 		       0, fsf_req->sbal_first, fsf_req->sbal_number,
 		       &req_queue->buffer[fsf_req->sbal_first]);

 	/*
 	 * adjust the number of free SBALs in request queue as well as
 	 * position of first one
 	 */
 	atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
 	ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
 	req_queue->free_index += fsf_req->sbal_number;	  /* increase */
 	req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
 	new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);

 	retval = do_QDIO(adapter->ccw_device,
 			 QDIO_FLAG_SYNC_OUTPUT,
 			 0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);

 	if (unlikely(retval)) {
 		/* Queues are down..... */
 		retval = -EIO;
 		/*
 		 * FIXME(potential race):
 		 * timer might be expired (absolutely unlikely)
 		 */
 		if (timer)
 			del_timer(timer);
 		write_lock_irqsave(&adapter->fsf_req_list_lock, flags);
 		list_del(&fsf_req->list);
 		write_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
 		/*
 		 * adjust the number of free SBALs in request queue as well as
 		 * position of first one
 		 */
 		zfcp_qdio_zero_sbals(req_queue->buffer,
 				     fsf_req->sbal_first, fsf_req->sbal_number);
 		atomic_add(fsf_req->sbal_number, &req_queue->free_count);
 		req_queue->free_index -= fsf_req->sbal_number;	 /* increase */
 		req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
 		req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
 		ZFCP_LOG_DEBUG
 			("error: do_QDIO failed. Buffers could not be enqueued "
 			 "to request queue.\n");
 	} else {
 		req_queue->distance_from_int = new_distance_from_int;
 		/*
 		 * increase FSF sequence counter -
 		 * this must only be done for request successfully enqueued to
 		 * QDIO this rejected requests may be cleaned up by calling
 		 * routines  resulting in missing sequence counter values
 		 * otherwise,
 		 */
 		/* Don't increase for unsolicited status */
 		if (likely(inc_seq_no)) {
 			adapter->fsf_req_seq_no++;
 			ZFCP_LOG_TRACE
 			    ("FSF sequence counter value of adapter %s "
 			     "increased to %i\n",
 			     zfcp_get_busid_by_adapter(adapter),
 			     adapter->fsf_req_seq_no);
 		}
 		/* count FSF requests pending */
 		atomic_inc(&adapter->fsf_reqs_active);
 	}
 	return retval;
 }

 /*
  * function:    zfcp_fsf_req_cleanup
  *
  * purpose:	cleans up an FSF request and removes it from the specified list
  *
  * returns:
  *
  * assumption:	no pending SB in SBALEs other than QTCB
  */
 void
 zfcp_fsf_req_cleanup(struct zfcp_fsf_req *fsf_req)
 {
 	struct zfcp_adapter *adapter = fsf_req->adapter;
 	unsigned long flags;

 	write_lock_irqsave(&adapter->fsf_req_list_lock, flags);
 	list_del(&fsf_req->list);
 	write_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
 	zfcp_fsf_req_free(fsf_req);
 }

 #undef ZFCP_LOG_AREA