MIPS: Loongson: Convert to new irq_chip functions

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / lpfc / lpfc_vport.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2008 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_fc.h>
#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_version.h"
#include "lpfc_vport.h"

inline void lpfc_vport_set_state(struct lpfc_vport *vport,
                                 enum fc_vport_state new_state)
{
        struct fc_vport *fc_vport = vport->fc_vport;

        if (fc_vport) {
                /*
                 * When the transport defines fc_vport_set state we will replace
                 * this code with the following line
                 */
                /* fc_vport_set_state(fc_vport, new_state); */
                if (new_state != FC_VPORT_INITIALIZING)
                        fc_vport->vport_last_state = fc_vport->vport_state;
                fc_vport->vport_state = new_state;
        }

        /* for all the error states we will set the invternal state to FAILED */
        switch (new_state) {
        case FC_VPORT_NO_FABRIC_SUPP:
        case FC_VPORT_NO_FABRIC_RSCS:
        case FC_VPORT_FABRIC_LOGOUT:
        case FC_VPORT_FABRIC_REJ_WWN:
        case FC_VPORT_FAILED:
                vport->port_state = LPFC_VPORT_FAILED;
                break;
        case FC_VPORT_LINKDOWN:
                vport->port_state = LPFC_VPORT_UNKNOWN;
                break;
        default:
                /* do nothing */
                break;
        }
}

static int
lpfc_alloc_vpi(struct lpfc_hba *phba)
{
        int  vpi;

        spin_lock_irq(&phba->hbalock);
        /* Start at bit 1 because vpi zero is reserved for the physical port */
        vpi = find_next_zero_bit(phba->vpi_bmask, (phba->max_vpi + 1), 1);
        if (vpi > phba->max_vpi)
                vpi = 0;
        else
                set_bit(vpi, phba->vpi_bmask);
        if (phba->sli_rev == LPFC_SLI_REV4)
                phba->sli4_hba.max_cfg_param.vpi_used++;
        spin_unlock_irq(&phba->hbalock);
        return vpi;
}

static void
lpfc_free_vpi(struct lpfc_hba *phba, int vpi)
{
        if (vpi == 0)
                return;
        spin_lock_irq(&phba->hbalock);
        clear_bit(vpi, phba->vpi_bmask);
        if (phba->sli_rev == LPFC_SLI_REV4)
                phba->sli4_hba.max_cfg_param.vpi_used--;
        spin_unlock_irq(&phba->hbalock);
}

static int
lpfc_vport_sparm(struct lpfc_hba *phba, struct lpfc_vport *vport)
{
        LPFC_MBOXQ_t *pmb;
        MAILBOX_t *mb;
        struct lpfc_dmabuf *mp;
        int  rc;

        pmb = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmb) {
                return -ENOMEM;
        }
        mb = &pmb->u.mb;

        rc = lpfc_read_sparam(phba, pmb, vport->vpi);
        if (rc) {
                mempool_free(pmb, phba->mbox_mem_pool);
                return -ENOMEM;
        }

        /*
         * Grab buffer pointer and clear context1 so we can use
         * lpfc_sli_issue_box_wait
         */
        mp = (struct lpfc_dmabuf *) pmb->context1;
        pmb->context1 = NULL;

        pmb->vport = vport;
        rc = lpfc_sli_issue_mbox_wait(phba, pmb, phba->fc_ratov * 2);
        if (rc != MBX_SUCCESS) {
                if (signal_pending(current)) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT | LOG_VPORT,
                                         "1830 Signal aborted mbxCmd x%x\n",
                                         mb->mbxCommand);
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                        if (rc != MBX_TIMEOUT)
                                mempool_free(pmb, phba->mbox_mem_pool);
                        return -EINTR;
                } else {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT | LOG_VPORT,
                                         "1818 VPort failed init, mbxCmd x%x "
                                         "READ_SPARM mbxStatus x%x, rc = x%x\n",
                                         mb->mbxCommand, mb->mbxStatus, rc);
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                        if (rc != MBX_TIMEOUT)
                                mempool_free(pmb, phba->mbox_mem_pool);
                        return -EIO;
                }
        }

        memcpy(&vport->fc_sparam, mp->virt, sizeof (struct serv_parm));
        memcpy(&vport->fc_nodename, &vport->fc_sparam.nodeName,
               sizeof (struct lpfc_name));
        memcpy(&vport->fc_portname, &vport->fc_sparam.portName,
               sizeof (struct lpfc_name));

        lpfc_mbuf_free(phba, mp->virt, mp->phys);
        kfree(mp);
        mempool_free(pmb, phba->mbox_mem_pool);

        return 0;
}

static int
lpfc_valid_wwn_format(struct lpfc_hba *phba, struct lpfc_name *wwn,
                      const char *name_type)
{
                                /* ensure that IEEE format 1 addresses
                                 * contain zeros in bits 59-48
                                 */
        if (!((wwn->u.wwn[0] >> 4) == 1 &&
              ((wwn->u.wwn[0] & 0xf) != 0 || (wwn->u.wwn[1] & 0xf) != 0)))
                return 1;

        lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
                        "1822 Invalid %s: %02x:%02x:%02x:%02x:"
                        "%02x:%02x:%02x:%02x\n",
                        name_type,
                        wwn->u.wwn[0], wwn->u.wwn[1],
                        wwn->u.wwn[2], wwn->u.wwn[3],
                        wwn->u.wwn[4], wwn->u.wwn[5],
                        wwn->u.wwn[6], wwn->u.wwn[7]);
        return 0;
}

static int
lpfc_unique_wwpn(struct lpfc_hba *phba, struct lpfc_vport *new_vport)
{
        struct lpfc_vport *vport;
        unsigned long flags;

        spin_lock_irqsave(&phba->hbalock, flags);
        list_for_each_entry(vport, &phba->port_list, listentry) {
                if (vport == new_vport)
                        continue;
                /* If they match, return not unique */
                if (memcmp(&vport->fc_sparam.portName,
                           &new_vport->fc_sparam.portName,
                           sizeof(struct lpfc_name)) == 0) {
                        spin_unlock_irqrestore(&phba->hbalock, flags);
                        return 0;
                }
        }
        spin_unlock_irqrestore(&phba->hbalock, flags);
        return 1;
}

/**
 * lpfc_discovery_wait - Wait for driver discovery to quiesce
 * @vport: The virtual port for which this call is being executed.
 *
 * This driver calls this routine specifically from lpfc_vport_delete
 * to enforce a synchronous execution of vport
 * delete relative to discovery activities.  The
 * lpfc_vport_delete routine should not return until it
 * can reasonably guarantee that discovery has quiesced.
 * Post FDISC LOGO, the driver must wait until its SAN teardown is
 * complete and all resources recovered before allowing
 * cleanup.
 *
 * This routine does not require any locks held.
 **/
static void lpfc_discovery_wait(struct lpfc_vport *vport)
{
        struct lpfc_hba *phba = vport->phba;
        uint32_t wait_flags = 0;
        unsigned long wait_time_max;
        unsigned long start_time;

        wait_flags = FC_RSCN_MODE | FC_RSCN_DISCOVERY | FC_NLP_MORE |
                     FC_RSCN_DEFERRED | FC_NDISC_ACTIVE | FC_DISC_TMO;

        /*
         * The time constraint on this loop is a balance between the
         * fabric RA_TOV value and dev_loss tmo.  The driver's
         * devloss_tmo is 10 giving this loop a 3x multiplier minimally.
         */
        wait_time_max = msecs_to_jiffies(((phba->fc_ratov * 3) + 3) * 1000);
        wait_time_max += jiffies;
        start_time = jiffies;
        while (time_before(jiffies, wait_time_max)) {
                if ((vport->num_disc_nodes > 0)    ||
                    (vport->fc_flag & wait_flags)  ||
                    ((vport->port_state > LPFC_VPORT_FAILED) &&
                     (vport->port_state < LPFC_VPORT_READY))) {
                        lpfc_printf_vlog(vport, KERN_INFO, LOG_VPORT,
                                        "1833 Vport discovery quiesce Wait:"
                                        " state x%x fc_flags x%x"
                                        " num_nodes x%x, waiting 1000 msecs"
                                        " total wait msecs x%x\n",
                                        vport->port_state, vport->fc_flag,
                                        vport->num_disc_nodes,
                                        jiffies_to_msecs(jiffies - start_time));
                        msleep(1000);
                } else {
                        /* Base case.  Wait variants satisfied.  Break out */
                        lpfc_printf_vlog(vport, KERN_INFO, LOG_VPORT,
                                         "1834 Vport discovery quiesced:"
                                         " state x%x fc_flags x%x"
                                         " wait msecs x%x\n",
                                         vport->port_state, vport->fc_flag,
                                         jiffies_to_msecs(jiffies
                                                - start_time));
                        break;
                }
        }

        if (time_after(jiffies, wait_time_max))
                lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                                "1835 Vport discovery quiesce failed:"
                                " state x%x fc_flags x%x wait msecs x%x\n",
                                vport->port_state, vport->fc_flag,
                                jiffies_to_msecs(jiffies - start_time));
}

int
lpfc_vport_create(struct fc_vport *fc_vport, bool disable)
{
        struct lpfc_nodelist *ndlp;
        struct Scsi_Host *shost = fc_vport->shost;
        struct lpfc_vport *pport = (struct lpfc_vport *) shost->hostdata;
        struct lpfc_hba   *phba = pport->phba;
        struct lpfc_vport *vport = NULL;
        int instance;
        int vpi;
        int rc = VPORT_ERROR;
        int status;

        if ((phba->sli_rev < 3) || !(phba->cfg_enable_npiv)) {
                lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
                                "1808 Create VPORT failed: "
                                "NPIV is not enabled: SLImode:%d\n",
                                phba->sli_rev);
                rc = VPORT_INVAL;
                goto error_out;
        }

        vpi = lpfc_alloc_vpi(phba);
        if (vpi == 0) {
                lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
                                "1809 Create VPORT failed: "
                                "Max VPORTs (%d) exceeded\n",
                                phba->max_vpi);
                rc = VPORT_NORESOURCES;
                goto error_out;
        }

        /* Assign an unused board number */
        if ((instance = lpfc_get_instance()) < 0) {
                lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
                                "1810 Create VPORT failed: Cannot get "
                                "instance number\n");
                lpfc_free_vpi(phba, vpi);
                rc = VPORT_NORESOURCES;
                goto error_out;
        }

        vport = lpfc_create_port(phba, instance, &fc_vport->dev);
        if (!vport) {
                lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
                                "1811 Create VPORT failed: vpi x%x\n", vpi);
                lpfc_free_vpi(phba, vpi);
                rc = VPORT_NORESOURCES;
                goto error_out;
        }

        vport->vpi = vpi;
        lpfc_debugfs_initialize(vport);

        if ((status = lpfc_vport_sparm(phba, vport))) {
                if (status == -EINTR) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                                         "1831 Create VPORT Interrupted.\n");
                        rc = VPORT_ERROR;
                } else {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                                         "1813 Create VPORT failed. "
                                         "Cannot get sparam\n");
                        rc = VPORT_NORESOURCES;
                }
                lpfc_free_vpi(phba, vpi);
                destroy_port(vport);
                goto error_out;
        }

        u64_to_wwn(fc_vport->node_name, vport->fc_nodename.u.wwn);
        u64_to_wwn(fc_vport->port_name, vport->fc_portname.u.wwn);

        memcpy(&vport->fc_sparam.portName, vport->fc_portname.u.wwn, 8);
        memcpy(&vport->fc_sparam.nodeName, vport->fc_nodename.u.wwn, 8);

        if (!lpfc_valid_wwn_format(phba, &vport->fc_sparam.nodeName, "WWNN") ||
            !lpfc_valid_wwn_format(phba, &vport->fc_sparam.portName, "WWPN")) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                                 "1821 Create VPORT failed. "
                                 "Invalid WWN format\n");
                lpfc_free_vpi(phba, vpi);
                destroy_port(vport);
                rc = VPORT_INVAL;
                goto error_out;
        }

        if (!lpfc_unique_wwpn(phba, vport)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                                 "1823 Create VPORT failed. "
                                 "Duplicate WWN on HBA\n");
                lpfc_free_vpi(phba, vpi);
                destroy_port(vport);
                rc = VPORT_INVAL;
                goto error_out;
        }

        /* Create binary sysfs attribute for vport */
        lpfc_alloc_sysfs_attr(vport);

        *(struct lpfc_vport **)fc_vport->dd_data = vport;
        vport->fc_vport = fc_vport;

        /*
         * In SLI4, the vpi must be activated before it can be used
         * by the port.
         */
        if ((phba->sli_rev == LPFC_SLI_REV4) &&
            (pport->fc_flag & FC_VFI_REGISTERED)) {
                rc = lpfc_sli4_init_vpi(vport);
                if (rc) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
                                        "1838 Failed to INIT_VPI on vpi %d "
                                        "status %d\n", vpi, rc);
                        rc = VPORT_NORESOURCES;
                        lpfc_free_vpi(phba, vpi);
                        goto error_out;
                }
        } else if (phba->sli_rev == LPFC_SLI_REV4) {
                /*
                 * Driver cannot INIT_VPI now. Set the flags to
                 * init_vpi when reg_vfi complete.
                 */
                vport->fc_flag |= FC_VPORT_NEEDS_INIT_VPI;
                lpfc_vport_set_state(vport, FC_VPORT_LINKDOWN);
                rc = VPORT_OK;
                goto out;
        }

        if ((phba->link_state < LPFC_LINK_UP) ||
            (pport->port_state < LPFC_FABRIC_CFG_LINK) ||
            (phba->fc_topology == LPFC_TOPOLOGY_LOOP)) {
                lpfc_vport_set_state(vport, FC_VPORT_LINKDOWN);
                rc = VPORT_OK;
                goto out;
        }

        if (disable) {
                lpfc_vport_set_state(vport, FC_VPORT_DISABLED);
                rc = VPORT_OK;
                goto out;
        }

        /* Use the Physical nodes Fabric NDLP to determine if the link is
         * up and ready to FDISC.
         */
        ndlp = lpfc_findnode_did(phba->pport, Fabric_DID);
        if (ndlp && NLP_CHK_NODE_ACT(ndlp) &&
            ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) {
                if (phba->link_flag & LS_NPIV_FAB_SUPPORTED) {
                        lpfc_set_disctmo(vport);
                        lpfc_initial_fdisc(vport);
                } else {
                        lpfc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                         "0262 No NPIV Fabric support\n");
                }
        } else {
                lpfc_vport_set_state(vport, FC_VPORT_FAILED);
        }
        rc = VPORT_OK;

out:
        lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                        "1825 Vport Created.\n");
        lpfc_host_attrib_init(lpfc_shost_from_vport(vport));
error_out:
        return rc;
}

static int
disable_vport(struct fc_vport *fc_vport)
{
        struct lpfc_vport *vport = *(struct lpfc_vport **)fc_vport->dd_data;
        struct lpfc_hba   *phba = vport->phba;
        struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;
        long timeout;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (ndlp && NLP_CHK_NODE_ACT(ndlp)
            && phba->link_state >= LPFC_LINK_UP) {
                vport->unreg_vpi_cmpl = VPORT_INVAL;
                timeout = msecs_to_jiffies(phba->fc_ratov * 2000);
                if (!lpfc_issue_els_npiv_logo(vport, ndlp))
                        while (vport->unreg_vpi_cmpl == VPORT_INVAL && timeout)
                                timeout = schedule_timeout(timeout);
        }

        lpfc_sli_host_down(vport);

        /* Mark all nodes for discovery so we can remove them by
         * calling lpfc_cleanup_rpis(vport, 1)
         */
        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
                if (!NLP_CHK_NODE_ACT(ndlp))
                        continue;
                if (ndlp->nlp_state == NLP_STE_UNUSED_NODE)
                        continue;
                lpfc_disc_state_machine(vport, ndlp, NULL,
                                        NLP_EVT_DEVICE_RECOVERY);
        }
        lpfc_cleanup_rpis(vport, 1);

        lpfc_stop_vport_timers(vport);
        lpfc_unreg_all_rpis(vport);
        lpfc_unreg_default_rpis(vport);
        /*
         * Completion of unreg_vpi (lpfc_mbx_cmpl_unreg_vpi) does the
         * scsi_host_put() to release the vport.
         */
        lpfc_mbx_unreg_vpi(vport);
        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_VPORT_NEEDS_INIT_VPI;
        spin_unlock_irq(shost->host_lock);

        lpfc_vport_set_state(vport, FC_VPORT_DISABLED);
        lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                         "1826 Vport Disabled.\n");
        return VPORT_OK;
}

static int
enable_vport(struct fc_vport *fc_vport)
{
        struct lpfc_vport *vport = *(struct lpfc_vport **)fc_vport->dd_data;
        struct lpfc_hba   *phba = vport->phba;
        struct lpfc_nodelist *ndlp = NULL;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if ((phba->link_state < LPFC_LINK_UP) ||
            (phba->fc_topology == LPFC_TOPOLOGY_LOOP)) {
                lpfc_vport_set_state(vport, FC_VPORT_LINKDOWN);
                return VPORT_OK;
        }

        spin_lock_irq(shost->host_lock);
        vport->load_flag |= FC_LOADING;
        vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
        spin_unlock_irq(shost->host_lock);

        /* Use the Physical nodes Fabric NDLP to determine if the link is
         * up and ready to FDISC.
         */
        ndlp = lpfc_findnode_did(phba->pport, Fabric_DID);
        if (ndlp && NLP_CHK_NODE_ACT(ndlp)
            && ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) {
                if (phba->link_flag & LS_NPIV_FAB_SUPPORTED) {
                        lpfc_set_disctmo(vport);
                        lpfc_initial_fdisc(vport);
                } else {
                        lpfc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                         "0264 No NPIV Fabric support\n");
                }
        } else {
                lpfc_vport_set_state(vport, FC_VPORT_FAILED);
        }
        lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                         "1827 Vport Enabled.\n");
        return VPORT_OK;
}

int
lpfc_vport_disable(struct fc_vport *fc_vport, bool disable)
{
        if (disable)
                return disable_vport(fc_vport);
        else
                return enable_vport(fc_vport);
}


int
lpfc_vport_delete(struct fc_vport *fc_vport)
{
        struct lpfc_nodelist *ndlp = NULL;
        struct Scsi_Host *shost = (struct Scsi_Host *) fc_vport->shost;
        struct lpfc_vport *vport = *(struct lpfc_vport **)fc_vport->dd_data;
        struct lpfc_hba   *phba = vport->phba;
        long timeout;

        if (vport->port_type == LPFC_PHYSICAL_PORT) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                                 "1812 vport_delete failed: Cannot delete "
                                 "physical host\n");
                return VPORT_ERROR;
        }

        /* If the vport is a static vport fail the deletion. */
        if ((vport->vport_flag & STATIC_VPORT) &&
                !(phba->pport->load_flag & FC_UNLOADING)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                                 "1837 vport_delete failed: Cannot delete "
                                 "static vport.\n");
                return VPORT_ERROR;
        }
        spin_lock_irq(&phba->hbalock);
        vport->load_flag |= FC_UNLOADING;
        spin_unlock_irq(&phba->hbalock);
        /*
         * If we are not unloading the driver then prevent the vport_delete
         * from happening until after this vport's discovery is finished.
         */
        if (!(phba->pport->load_flag & FC_UNLOADING)) {
                int check_count = 0;
                while (check_count < ((phba->fc_ratov * 3) + 3) &&
                       vport->port_state > LPFC_VPORT_FAILED &&
                       vport->port_state < LPFC_VPORT_READY) {
                        check_count++;
                        msleep(1000);
                }
                if (vport->port_state > LPFC_VPORT_FAILED &&
                    vport->port_state < LPFC_VPORT_READY)
                        return -EAGAIN;
        }
        /*
         * This is a bit of a mess.  We want to ensure the shost doesn't get
         * torn down until we're done with the embedded lpfc_vport structure.
         *
         * Beyond holding a reference for this function, we also need a
         * reference for outstanding I/O requests we schedule during delete
         * processing.  But once we scsi_remove_host() we can no longer obtain
         * a reference through scsi_host_get().
         *
         * So we take two references here.  We release one reference at the
         * bottom of the function -- after delinking the vport.  And we
         * release the other at the completion of the unreg_vpi that get's
         * initiated after we've disposed of all other resources associated
         * with the port.
         */
        if (!scsi_host_get(shost))
                return VPORT_INVAL;
        if (!scsi_host_get(shost)) {
                scsi_host_put(shost);
                return VPORT_INVAL;
        }
        lpfc_free_sysfs_attr(vport);

        lpfc_debugfs_terminate(vport);

        /* Remove FC host and then SCSI host with the vport */
        fc_remove_host(lpfc_shost_from_vport(vport));
        scsi_remove_host(lpfc_shost_from_vport(vport));

        ndlp = lpfc_findnode_did(phba->pport, Fabric_DID);

        /* In case of driver unload, we shall not perform fabric logo as the
         * worker thread already stopped at this stage and, in this case, we
         * can safely skip the fabric logo.
         */
        if (phba->pport->load_flag & FC_UNLOADING) {
                if (ndlp && NLP_CHK_NODE_ACT(ndlp) &&
                    ndlp->nlp_state == NLP_STE_UNMAPPED_NODE &&
                    phba->link_state >= LPFC_LINK_UP) {
                        /* First look for the Fabric ndlp */
                        ndlp = lpfc_findnode_did(vport, Fabric_DID);
                        if (!ndlp)
                                goto skip_logo;
                        else if (!NLP_CHK_NODE_ACT(ndlp)) {
                                ndlp = lpfc_enable_node(vport, ndlp,
                                                        NLP_STE_UNUSED_NODE);
                                if (!ndlp)
                                        goto skip_logo;
                        }
                        /* Remove ndlp from vport npld list */
                        lpfc_dequeue_node(vport, ndlp);

                        /* Indicate free memory when release */
                        spin_lock_irq(&phba->ndlp_lock);
                        NLP_SET_FREE_REQ(ndlp);
                        spin_unlock_irq(&phba->ndlp_lock);
                        /* Kick off release ndlp when it can be safely done */
                        lpfc_nlp_put(ndlp);
                }
                goto skip_logo;
        }

        /* Otherwise, we will perform fabric logo as needed */
        if (ndlp && NLP_CHK_NODE_ACT(ndlp) &&
            ndlp->nlp_state == NLP_STE_UNMAPPED_NODE &&
            phba->link_state >= LPFC_LINK_UP &&
            phba->fc_topology != LPFC_TOPOLOGY_LOOP) {
                if (vport->cfg_enable_da_id) {
                        timeout = msecs_to_jiffies(phba->fc_ratov * 2000);
                        if (!lpfc_ns_cmd(vport, SLI_CTNS_DA_ID, 0, 0))
                                while (vport->ct_flags && timeout)
                                        timeout = schedule_timeout(timeout);
                        else
                                lpfc_printf_log(vport->phba, KERN_WARNING,
                                                LOG_VPORT,
                                                "1829 CT command failed to "
                                                "delete objects on fabric\n");
                }
                /* First look for the Fabric ndlp */
                ndlp = lpfc_findnode_did(vport, Fabric_DID);
                if (!ndlp) {
                        /* Cannot find existing Fabric ndlp, allocate one */
                        ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                        if (!ndlp)
                                goto skip_logo;
                        lpfc_nlp_init(vport, ndlp, Fabric_DID);
                        /* Indicate free memory when release */
                        NLP_SET_FREE_REQ(ndlp);
                } else {
                        if (!NLP_CHK_NODE_ACT(ndlp))
                                ndlp = lpfc_enable_node(vport, ndlp,
                                                NLP_STE_UNUSED_NODE);
                                if (!ndlp)
                                        goto skip_logo;

                        /* Remove ndlp from vport npld list */
                        lpfc_dequeue_node(vport, ndlp);
                        spin_lock_irq(&phba->ndlp_lock);
                        if (!NLP_CHK_FREE_REQ(ndlp))
                                /* Indicate free memory when release */
                                NLP_SET_FREE_REQ(ndlp);
                        else {
                                /* Skip this if ndlp is already in free mode */
                                spin_unlock_irq(&phba->ndlp_lock);
                                goto skip_logo;
                        }
                        spin_unlock_irq(&phba->ndlp_lock);
                }
                if (!(vport->vpi_state & LPFC_VPI_REGISTERED))
                        goto skip_logo;
                vport->unreg_vpi_cmpl = VPORT_INVAL;
                timeout = msecs_to_jiffies(phba->fc_ratov * 2000);
                if (!lpfc_issue_els_npiv_logo(vport, ndlp))
                        while (vport->unreg_vpi_cmpl == VPORT_INVAL && timeout)
                                timeout = schedule_timeout(timeout);
        }

        if (!(phba->pport->load_flag & FC_UNLOADING))
                lpfc_discovery_wait(vport);

skip_logo:
        lpfc_cleanup(vport);
        lpfc_sli_host_down(vport);

        lpfc_stop_vport_timers(vport);

        if (!(phba->pport->load_flag & FC_UNLOADING)) {
                lpfc_unreg_all_rpis(vport);
                lpfc_unreg_default_rpis(vport);
                /*
                 * Completion of unreg_vpi (lpfc_mbx_cmpl_unreg_vpi)
                 * does the scsi_host_put() to release the vport.
                 */
                if (lpfc_mbx_unreg_vpi(vport))
                        scsi_host_put(shost);
        } else
                scsi_host_put(shost);

        lpfc_free_vpi(phba, vport->vpi);
        vport->work_port_events = 0;
        spin_lock_irq(&phba->hbalock);
        list_del_init(&vport->listentry);
        spin_unlock_irq(&phba->hbalock);
        lpfc_printf_vlog(vport, KERN_ERR, LOG_VPORT,
                         "1828 Vport Deleted.\n");
        scsi_host_put(shost);
        return VPORT_OK;
}

struct lpfc_vport **
lpfc_create_vport_work_array(struct lpfc_hba *phba)
{
        struct lpfc_vport *port_iterator;
        struct lpfc_vport **vports;
        int index = 0;
        vports = kzalloc((phba->max_vports + 1) * sizeof(struct lpfc_vport *),
                         GFP_KERNEL);
        if (vports == NULL)
                return NULL;
        spin_lock_irq(&phba->hbalock);
        list_for_each_entry(port_iterator, &phba->port_list, listentry) {
                if (!scsi_host_get(lpfc_shost_from_vport(port_iterator))) {
                        if (!(port_iterator->load_flag & FC_UNLOADING))
                                lpfc_printf_vlog(port_iterator, KERN_ERR,
                                         LOG_VPORT,
                                         "1801 Create vport work array FAILED: "
                                         "cannot do scsi_host_get\n");
                        continue;
                }
                vports[index++] = port_iterator;
        }
        spin_unlock_irq(&phba->hbalock);
        return vports;
}

void
lpfc_destroy_vport_work_array(struct lpfc_hba *phba, struct lpfc_vport **vports)
{
        int i;
        if (vports == NULL)
                return;
        for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++)
                scsi_host_put(lpfc_shost_from_vport(vports[i]));
        kfree(vports);
}


/**
 * lpfc_vport_reset_stat_data - Reset the statistical data for the vport
 * @vport: Pointer to vport object.
 *
 * This function resets the statistical data for the vport. This function
 * is called with the host_lock held
 **/
void
lpfc_vport_reset_stat_data(struct lpfc_vport *vport)
{
        struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;

        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
                if (!NLP_CHK_NODE_ACT(ndlp))
                        continue;
                if (ndlp->lat_data)
                        memset(ndlp->lat_data, 0, LPFC_MAX_BUCKET_COUNT *
                                sizeof(struct lpfc_scsicmd_bkt));
        }
}


/**
 * lpfc_alloc_bucket - Allocate data buffer required for statistical data
 * @vport: Pointer to vport object.
 *
 * This function allocates data buffer required for all the FC
 * nodes of the vport to collect statistical data.
 **/
void
lpfc_alloc_bucket(struct lpfc_vport *vport)
{
        struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;

        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
                if (!NLP_CHK_NODE_ACT(ndlp))
                        continue;

                kfree(ndlp->lat_data);
                ndlp->lat_data = NULL;

                if (ndlp->nlp_state == NLP_STE_MAPPED_NODE) {
                        ndlp->lat_data = kcalloc(LPFC_MAX_BUCKET_COUNT,
                                         sizeof(struct lpfc_scsicmd_bkt),
                                         GFP_ATOMIC);

                        if (!ndlp->lat_data)
                                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE,
                                        "0287 lpfc_alloc_bucket failed to "
                                        "allocate statistical data buffer DID "
                                        "0x%x\n", ndlp->nlp_DID);
                }
        }
}

/**
 * lpfc_free_bucket - Free data buffer required for statistical data
 * @vport: Pointer to vport object.
 *
 * Th function frees statistical data buffer of all the FC
 * nodes of the vport.
 **/
void
lpfc_free_bucket(struct lpfc_vport *vport)
{
        struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;

        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
                if (!NLP_CHK_NODE_ACT(ndlp))
                        continue;

                kfree(ndlp->lat_data);
                ndlp->lat_data = NULL;
        }
}