[TG3]: Set minimal hw interrupt mitigation.

[linux-2.6/verdex.git] / drivers / s390 / scsi / zfcp_fsf.c

/*
 *
 * 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:
                ZFCP_LOG_TRACE("FSF_PROT_GOOD\n");
                break;

        case FSF_PROT_FSF_STATUS_PRESENTED:
                ZFCP_LOG_TRACE("FSF_PROT_FSF_STATUS_PRESENTED\n");
                break;

        case FSF_PROT_QTCB_VERSION_ERROR:
                ZFCP_LOG_FLAGS(0, "FSF_PROT_QTCB_VERSION_ERROR\n");
                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_FLAGS(0, "FSF_PROT_SEQ_NUMB_ERROR\n");
                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_FLAGS(0, "FSF_PROT_UNSUP_QTCB_TYPE\n");
                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_LOG_FLAGS(1, "FSF_PROT_HOST_CONNECTION_INITIALIZING\n");
                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:
                ZFCP_LOG_FLAGS(0, "FSF_PROT_DUPLICATE_REQUEST_IDS\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_PROT_LINK_DOWN\n");
                /*
                 * '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);
                        debug_text_event(adapter->erp_dbf, 1, "prot_link_down");
                }
                fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;

        case FSF_PROT_REEST_QUEUE:
                ZFCP_LOG_FLAGS(1, "FSF_PROT_REEST_QUEUE\n");
                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_FLAGS(0, "FSF_PROT_ERROR_STATE\n");
                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_FLAGS(0, "FSF_UNKNOWN_COMMAND\n");
                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_FLAGS(2, "FSF_FCP_RSP_AVAILABLE\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_SQ_FCP_RSP_AVAILABLE\n");
                debug_text_event(fsf_req->adapter->erp_dbf, 4, "fsf_sq_rsp");
                break;
        case FSF_SQ_RETRY_IF_POSSIBLE:
                ZFCP_LOG_FLAGS(2, "FSF_SQ_RETRY_IF_POSSIBLE\n");
                /* 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:
                ZFCP_LOG_FLAGS(2, "FSF_SQ_COMMAND_ABORTED\n");
                /* 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:
                ZFCP_LOG_FLAGS(0, "FSF_SQ_NO_RECOM\n");
                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_FLAGS(0, "FSF_SQ_ULP_PROGRAMMING_ERROR\n");
                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_LOG_FLAGS(3, "FSF_QTCB_FCP_CMND\n");
                zfcp_fsf_send_fcp_command_handler(fsf_req);
                break;

        case FSF_QTCB_ABORT_FCP_CMND:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_ABORT_FCP_CMND\n");
                zfcp_fsf_abort_fcp_command_handler(fsf_req);
                break;

        case FSF_QTCB_SEND_GENERIC:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_SEND_GENERIC\n");
                zfcp_fsf_send_ct_handler(fsf_req);
                break;

        case FSF_QTCB_OPEN_PORT_WITH_DID:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_OPEN_PORT_WITH_DID\n");
                zfcp_fsf_open_port_handler(fsf_req);
                break;

        case FSF_QTCB_OPEN_LUN:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_OPEN_LUN\n");
                zfcp_fsf_open_unit_handler(fsf_req);
                break;

        case FSF_QTCB_CLOSE_LUN:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_CLOSE_LUN\n");
                zfcp_fsf_close_unit_handler(fsf_req);
                break;

        case FSF_QTCB_CLOSE_PORT:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_CLOSE_PORT\n");
                zfcp_fsf_close_port_handler(fsf_req);
                break;

        case FSF_QTCB_CLOSE_PHYSICAL_PORT:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_CLOSE_PHYSICAL_PORT\n");
                zfcp_fsf_close_physical_port_handler(fsf_req);
                break;

        case FSF_QTCB_EXCHANGE_CONFIG_DATA:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_EXCHANGE_CONFIG_DATA\n");
                zfcp_fsf_exchange_config_data_handler(fsf_req);
                break;

        case FSF_QTCB_EXCHANGE_PORT_DATA:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_EXCHANGE_PORT_DATA\n");
                zfcp_fsf_exchange_port_data_handler(fsf_req);
                break;

        case FSF_QTCB_SEND_ELS:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_SEND_ELS\n");
                zfcp_fsf_send_els_handler(fsf_req);
                break;

        case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_DOWNLOAD_CONTROL_FILE\n");
                zfcp_fsf_control_file_handler(fsf_req);
                break;

        case FSF_QTCB_UPLOAD_CONTROL_FILE:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_UPLOAD_CONTROL_FILE\n");
                zfcp_fsf_control_file_handler(fsf_req);
                break;

        default:
                ZFCP_LOG_FLAGS(2, "FSF_QTCB_UNKNOWN\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT\n");
                debug_text_event(adapter->erp_dbf, 3, "unsol_pc_phys:");
                zfcp_erp_port_reopen(port, 0);
                break;

        case FSF_STATUS_READ_SUB_ERROR_PORT:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_SUB_ERROR_PORT\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_PORT_CLOSED\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_INCOMING_ELS\n");
                debug_text_event(adapter->erp_dbf, 3, "unsol_els:");
                zfcp_fsf_incoming_els(fsf_req);
                break;

        case FSF_STATUS_READ_SENSE_DATA_AVAIL:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_SENSE_DATA_AVAIL\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_BIT_ERROR_THRESHOLD\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_LINK_DOWN\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_LINK_UP\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_CFDC_UPDATED\n");
                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:
                ZFCP_LOG_FLAGS(1, "FSF_STATUS_READ_CFDC_HARDENED\n");
                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) {
                        ZFCP_LOG_FLAGS(2, "FSF_PORT_HANDLE_NOT_VALID\n");
                        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_FLAGS(1, "FSF_PORT_HANDLE_NOT_VALID\n");
                        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 */
                        ZFCP_LOG_FLAGS(0, "FSF_LUN_HANDLE_NOT_VALID\n");
                        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_FLAGS(1, "FSF_LUN_HANDLE_NOT_VALID\n");
                        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:
                ZFCP_LOG_FLAGS(2, "FSF_FCP_COMMAND_DOES_NOT_EXIST\n");
                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:
                /* 2 */
                ZFCP_LOG_FLAGS(0, "FSF_PORT_BOXED\n");
                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_FLAGS(0, "FSF_LUN_BOXED\n");
                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:
                /* 2 */
                ZFCP_LOG_FLAGS(0, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
                                         "fsf_sq_ltest");
                        /* reopening link to port */
                        zfcp_erp_port_reopen(unit->port, 0);
                        new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED\n");
                        /* 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:
                /* 3 */
                ZFCP_LOG_FLAGS(0, "FSF_GOOD\n");
                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:
                ZFCP_LOG_FLAGS(2,"FSF_GOOD\n");
                retval = 0;
                break;

        case FSF_SERVICE_CLASS_NOT_SUPPORTED:
                ZFCP_LOG_FLAGS(2, "FSF_SERVICE_CLASS_NOT_SUPPORTED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (header->fsf_status_qual.word[0]){
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,"FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        /* 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:
                        ZFCP_LOG_FLAGS(2,"FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED\n");
                        /* 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_FLAGS(2, "FSF_ACCESS_DENIED\n");
                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_FLAGS(2, "FSF_GENERIC_COMMAND_REJECTED\n");
                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_FLAGS(2, "FSF_PORT_HANDLE_NOT_VALID\n");
                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_FLAGS(2, "FSF_PORT_BOXED\n");
                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_FLAGS(2, "FSF_PAYLOAD_SIZE_MISMATCH\n");
                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_FLAGS(2, "FSF_REQUEST_SIZE_TOO_LARGE\n");
                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_FLAGS(2, "FSF_RESPONSE_SIZE_TOO_LARGE\n");
                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_FLAGS(2, "FSF_SBAL_MISMATCH\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_GOOD\n");
                retval = 0;
                break;

        case FSF_SERVICE_CLASS_NOT_SUPPORTED:
                ZFCP_LOG_FLAGS(2, "FSF_SERVICE_CLASS_NOT_SUPPORTED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (header->fsf_status_qual.word[0]){
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,"FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        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:
                        ZFCP_LOG_FLAGS(2,"FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED\n");
                        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:
                        ZFCP_LOG_FLAGS(2, "FSF_SQ_RETRY_IF_POSSIBLE\n");
                        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_FLAGS(2, "FSF_ELS_COMMAND_REJECTED\n");
                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_FLAGS(2, "FSF_PAYLOAD_SIZE_MISMATCH\n");
                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_FLAGS(2, "FSF_REQUEST_SIZE_TOO_LARGE\n");
                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_FLAGS(2, "FSF_RESPONSE_SIZE_TOO_LARGE\n");
                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_FLAGS(2, "FSF_SBAL_MISMATCH\n");
                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_FLAGS(2, "FSF_ACCESS_DENIED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_GOOD\n");

                if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
                        return -EIO;

                switch (adapter->fc_topology) {
                case FSF_TOPO_P2P:
                        ZFCP_LOG_FLAGS(1, "FSF_TOPO_P2P\n");
                        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_FLAGS(1, "FSF_TOPO_AL\n");
                        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_FLAGS(1, "FSF_TOPO_FABRIC\n");
                        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:
                ZFCP_LOG_FLAGS(2,"FSF_GOOD\n");
                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_FLAGS(0, "FSF_PORT_ALREADY_OPEN\n");
                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_FLAGS(2, "FSF_ACCESS_DENIED\n");
                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_FLAGS(1, "FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        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_FLAGS(0, "FSF_SQ_NO_RETRY_POSSIBLE\n");
                        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:
                ZFCP_LOG_FLAGS(3, "FSF_GOOD\n");
                /* 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_FLAGS(2, "FSF_UNKNOWN_OP_SUBTYPE\n");
                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_FLAGS(1, "FSF_PORT_HANDLE_NOT_VALID\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                /* 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_FLAGS(3, "FSF_GOOD\n");
                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_FLAGS(1, "FSF_PORT_HANDLE_NOT_VALID\n");
                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_FLAGS(2, "FSF_ACCESS_DENIED\n");
                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_FLAGS(2, "FSF_PORT_BOXED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        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:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED\n");
                        /* 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_FLAGS(3, "FSF_GOOD\n");
                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_FLAGS(1, "FSF_PORT_HANDLE_NOT_VALID\n");
                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_FLAGS(0, "FSF_LUN_ALREADY_OPEN\n");
                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_FLAGS(2, "FSF_ACCESS_DENIED\n");
                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_FLAGS(2, "FSF_PORT_BOXED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_LUN_SHARING_VIOLATION\n");
                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_FLAGS(1, "FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        /* Re-establish link to port */
                        debug_text_event(adapter->erp_dbf, 1,
                                         "fsf_sq_ltest");
                        zfcp_erp_port_reopen(unit->port, 0);
                        fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED\n");
                        /* 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_FLAGS(2, "FSF_INVALID_COMMAND_OPTION\n");
                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:
                ZFCP_LOG_FLAGS(3, "FSF_GOOD\n");
                /* 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_FLAGS(1, "FSF_PORT_HANDLE_NOT_VALID\n");
                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_FLAGS(1, "FSF_LUN_HANDLE_NOT_VALID\n");
                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_FLAGS(2, "FSF_PORT_BOXED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        /* re-establish link to port */
                        debug_text_event(fsf_req->adapter->erp_dbf, 1,
                                         "fsf_sq_ltest");
                        zfcp_erp_port_reopen(unit->port, 0);
                        fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED\n");
                        /* 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_FLAGS(3, "FSF_GOOD\n");
                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:
                ZFCP_LOG_FLAGS(3, "DMA_NONE\n");
                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:
                ZFCP_LOG_FLAGS(3, "DMA_FROM_DEVICE\n");
                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:
                ZFCP_LOG_FLAGS(3, "DMA_TO_DEVICE\n");
                fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
                sbtype = SBAL_FLAGS0_TYPE_WRITE;
                fcp_cmnd_iu->wddata = 1;
                break;
        case DMA_BIDIRECTIONAL:
                ZFCP_LOG_FLAGS(0, "DMA_BIDIRECTIONAL not supported\n");
        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_FLAGS(1, "FSF_PORT_HANDLE_NOT_VALID\n");
                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_FLAGS(1, "FSF_LUN_HANDLE_NOT_VALID\n");
                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_FLAGS(0, "FSF_HANDLE_MISMATCH\n");
                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:
                ZFCP_LOG_FLAGS(0, "FSF_SERVICE_CLASS_NOT_SUPPORTED\n");
                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_FLAGS(0, "FSF_FCPLUN_NOT_VALID\n");
                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_FLAGS(2, "FSF_ACCESS_DENIED\n");
                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_FLAGS(0, "FSF_DIRECTION_INDICATOR_NOT_VALID\n");
                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_FLAGS(0, "FSF_CMND_LENGTH_NOT_VALID\n");
                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_FLAGS(2, "FSF_PORT_BOXED\n");
                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_FLAGS(0, "FSF_LUN_BOXED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ADAPTER_STATUS_AVAILABLE\n");
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
                        ZFCP_LOG_FLAGS(2,
                                       "FSF_SQ_INVOKE_LINK_TEST_PROCEDURE\n");
                        /* re-establish link to port */
                        debug_text_event(fsf_req->adapter->erp_dbf, 1,
                                         "fsf_sq_ltest");
                        zfcp_erp_port_reopen(unit->port, 0);
                        zfcp_cmd_dbf_event_fsf(
                                "sqltest",
                                fsf_req,
                                &header->fsf_status_qual,
                                sizeof (union fsf_status_qual));
                        fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
                        ZFCP_LOG_FLAGS(3,
                                       "FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED\n");
                        /* 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");
                        zfcp_cmd_dbf_event_fsf(
                                "sqdeperp",
                                fsf_req,
                                &header->fsf_status_qual,
                                sizeof (union fsf_status_qual));
                        fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                        break;
                default:
                        /* FIXME: shall we consider this a successful transfer? */
                        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_FLAGS(3, "FSF_GOOD\n");
                break;

        case FSF_FCP_RSP_AVAILABLE:
                ZFCP_LOG_FLAGS(2, "FSF_FCP_RSP_AVAILABLE\n");
                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:
                        ZFCP_LOG_FLAGS(3, "RSP_CODE_GOOD\n");
                        /* 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:
                        ZFCP_LOG_FLAGS(0, "RSP_CODE_LENGTH_MISMATCH\n");
                        /* 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:
                        ZFCP_LOG_FLAGS(0, "RSP_CODE_FIELD_INVALID\n");
                        /* 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:
                        ZFCP_LOG_FLAGS(0, "RSP_CODE_RO_MISMATCH\n");
                        /* 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:
                ZFCP_LOG_FLAGS(3, "RSP_CODE_GOOD\n");
                /* ok, continue */
                ZFCP_LOG_DEBUG("no failure or Task Management "
                               "Function complete\n");
                break;
        case RSP_CODE_TASKMAN_UNSUPP:
                ZFCP_LOG_FLAGS(0, "RSP_CODE_TASKMAN_UNSUPP\n");
                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_FLAGS(0, "RSP_CODE_TASKMAN_FAILED\n");
                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_FLAGS(2, "FSF_GOOD\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_OPERATION_PARTIALLY_SUCCESSFUL\n");
                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_FLAGS(2, "FSF_AUTHORIZATION_FAILURE\n");
                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_FLAGS(2, "FSF_CFDC_ERROR_DETECTED\n");
                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_FLAGS(2, "FSF_CONTROL_FILE_UPDATE_ERROR\n");
                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_FLAGS(2, "FSF_CONTROL_FILE_TOO_LARGE\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_ACCESS_CONFLICT_DETECTED\n");
                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:
                ZFCP_LOG_FLAGS(2, "FSF_CONFLICTS_OVERRULED\n");
                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_FLAGS(2, "FSF_UNKNOWN_OP_SUBTYPE\n");
                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_FLAGS(2, "FSF_INVALID_COMMAND_OPTION\n");
                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