/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2011 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.                                     *
 *******************************************************************/
/* See Fibre Channel protocol T11 FC-LS for details */
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.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_vport.h"
#include "lpfc_debugfs.h"

static int lpfc_els_retry(struct lpfc_hba *, struct lpfc_iocbq *,
                          struct lpfc_iocbq *);
static void lpfc_cmpl_fabric_iocb(struct lpfc_hba *, struct lpfc_iocbq *,
                        struct lpfc_iocbq *);
static void lpfc_fabric_abort_vport(struct lpfc_vport *vport);
static int lpfc_issue_els_fdisc(struct lpfc_vport *vport,
                                struct lpfc_nodelist *ndlp, uint8_t retry);
static int lpfc_issue_fabric_iocb(struct lpfc_hba *phba,
                                  struct lpfc_iocbq *iocb);

static int lpfc_max_els_tries = 3;

/**
 * lpfc_els_chk_latt - Check host link attention event for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine checks whether there is an outstanding host link
 * attention event during the discovery process with the @vport. It is done
 * by reading the HBA's Host Attention (HA) register. If there is any host
 * link attention events during this @vport's discovery process, the @vport
 * shall be marked as FC_ABORT_DISCOVERY, a host link attention clear shall
 * be issued if the link state is not already in host link cleared state,
 * and a return code shall indicate whether the host link attention event
 * had happened.
 *
 * Note that, if either the host link is in state LPFC_LINK_DOWN or @vport
 * state in LPFC_VPORT_READY, the request for checking host link attention
 * event will be ignored and a return code shall indicate no host link
 * attention event had happened.
 *
 * Return codes
 *   0 - no host link attention event happened
 *   1 - host link attention event happened
 **/
int
lpfc_els_chk_latt(struct lpfc_vport *vport)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        uint32_t ha_copy;

        if (vport->port_state >= LPFC_VPORT_READY ||
            phba->link_state == LPFC_LINK_DOWN ||
            phba->sli_rev > LPFC_SLI_REV3)
                return 0;

        /* Read the HBA Host Attention Register */
        if (lpfc_readl(phba->HAregaddr, &ha_copy))
                return 1;

        if (!(ha_copy & HA_LATT))
                return 0;

        /* Pending Link Event during Discovery */
        lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
                         "0237 Pending Link Event during "
                         "Discovery: State x%x\n",
                         phba->pport->port_state);

        /* CLEAR_LA should re-enable link attention events and
         * we should then immediately take a LATT event. The
         * LATT processing should call lpfc_linkdown() which
         * will cleanup any left over in-progress discovery
         * events.
         */
        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_ABORT_DISCOVERY;
        spin_unlock_irq(shost->host_lock);

        if (phba->link_state != LPFC_CLEAR_LA)
                lpfc_issue_clear_la(phba, vport);

        return 1;
}

/**
 * lpfc_prep_els_iocb - Allocate and prepare a lpfc iocb data structure
 * @vport: pointer to a host virtual N_Port data structure.
 * @expectRsp: flag indicating whether response is expected.
 * @cmdSize: size of the ELS command.
 * @retry: number of retries to the command IOCB when it fails.
 * @ndlp: pointer to a node-list data structure.
 * @did: destination identifier.
 * @elscmd: the ELS command code.
 *
 * This routine is used for allocating a lpfc-IOCB data structure from
 * the driver lpfc-IOCB free-list and prepare the IOCB with the parameters
 * passed into the routine for discovery state machine to issue an Extended
 * Link Service (ELS) commands. It is a generic lpfc-IOCB allocation
 * and preparation routine that is used by all the discovery state machine
 * routines and the ELS command-specific fields will be later set up by
 * the individual discovery machine routines after calling this routine
 * allocating and preparing a generic IOCB data structure. It fills in the
 * Buffer Descriptor Entries (BDEs), allocates buffers for both command
 * payload and response payload (if expected). The reference count on the
 * ndlp is incremented by 1 and the reference to the ndlp is put into
 * context1 of the IOCB data structure for this IOCB to hold the ndlp
 * reference for the command's callback function to access later.
 *
 * Return code
 *   Pointer to the newly allocated/prepared els iocb data structure
 *   NULL - when els iocb data structure allocation/preparation failed
 **/
struct lpfc_iocbq *
lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp,
                   uint16_t cmdSize, uint8_t retry,
                   struct lpfc_nodelist *ndlp, uint32_t did,
                   uint32_t elscmd)
{
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_dmabuf *pcmd, *prsp, *pbuflist;
        struct ulp_bde64 *bpl;
        IOCB_t *icmd;


        if (!lpfc_is_link_up(phba))
                return NULL;

        /* Allocate buffer for  command iocb */
        elsiocb = lpfc_sli_get_iocbq(phba);

        if (elsiocb == NULL)
                return NULL;

        /*
         * If this command is for fabric controller and HBA running
         * in FIP mode send FLOGI, FDISC and LOGO as FIP frames.
         */
        if ((did == Fabric_DID) &&
                (phba->hba_flag & HBA_FIP_SUPPORT) &&
                ((elscmd == ELS_CMD_FLOGI) ||
                 (elscmd == ELS_CMD_FDISC) ||
                 (elscmd == ELS_CMD_LOGO)))
                switch (elscmd) {
                case ELS_CMD_FLOGI:
                elsiocb->iocb_flag |=
                        ((LPFC_ELS_ID_FLOGI << LPFC_FIP_ELS_ID_SHIFT)
                                        & LPFC_FIP_ELS_ID_MASK);
                break;
                case ELS_CMD_FDISC:
                elsiocb->iocb_flag |=
                        ((LPFC_ELS_ID_FDISC << LPFC_FIP_ELS_ID_SHIFT)
                                        & LPFC_FIP_ELS_ID_MASK);
                break;
                case ELS_CMD_LOGO:
                elsiocb->iocb_flag |=
                        ((LPFC_ELS_ID_LOGO << LPFC_FIP_ELS_ID_SHIFT)
                                        & LPFC_FIP_ELS_ID_MASK);
                break;
                }
        else
                elsiocb->iocb_flag &= ~LPFC_FIP_ELS_ID_MASK;

        icmd = &elsiocb->iocb;

        /* fill in BDEs for command */
        /* Allocate buffer for command payload */
        pcmd = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (pcmd)
                pcmd->virt = lpfc_mbuf_alloc(phba, MEM_PRI, &pcmd->phys);
        if (!pcmd || !pcmd->virt)
                goto els_iocb_free_pcmb_exit;

        INIT_LIST_HEAD(&pcmd->list);

        /* Allocate buffer for response payload */
        if (expectRsp) {
                prsp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
                if (prsp)
                        prsp->virt = lpfc_mbuf_alloc(phba, MEM_PRI,
                                                     &prsp->phys);
                if (!prsp || !prsp->virt)
                        goto els_iocb_free_prsp_exit;
                INIT_LIST_HEAD(&prsp->list);
        } else
                prsp = NULL;

        /* Allocate buffer for Buffer ptr list */
        pbuflist = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (pbuflist)
                pbuflist->virt = lpfc_mbuf_alloc(phba, MEM_PRI,
                                                 &pbuflist->phys);
        if (!pbuflist || !pbuflist->virt)
                goto els_iocb_free_pbuf_exit;

        INIT_LIST_HEAD(&pbuflist->list);

        icmd->un.elsreq64.bdl.addrHigh = putPaddrHigh(pbuflist->phys);
        icmd->un.elsreq64.bdl.addrLow = putPaddrLow(pbuflist->phys);
        icmd->un.elsreq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
        icmd->un.elsreq64.remoteID = did;       /* DID */
        if (expectRsp) {
                icmd->un.elsreq64.bdl.bdeSize = (2 * sizeof(struct ulp_bde64));
                icmd->ulpCommand = CMD_ELS_REQUEST64_CR;
                icmd->ulpTimeout = phba->fc_ratov * 2;
        } else {
                icmd->un.elsreq64.bdl.bdeSize = sizeof(struct ulp_bde64);
                icmd->ulpCommand = CMD_XMIT_ELS_RSP64_CX;
        }
        icmd->ulpBdeCount = 1;
        icmd->ulpLe = 1;
        icmd->ulpClass = CLASS3;

        if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
                icmd->un.elsreq64.myID = vport->fc_myDID;

                /* For ELS_REQUEST64_CR, use the VPI by default */
                icmd->ulpContext = phba->vpi_ids[vport->vpi];
                icmd->ulpCt_h = 0;
                /* The CT field must be 0=INVALID_RPI for the ECHO cmd */
                if (elscmd == ELS_CMD_ECHO)
                        icmd->ulpCt_l = 0; /* context = invalid RPI */
                else
                        icmd->ulpCt_l = 1; /* context = VPI */
        }

        bpl = (struct ulp_bde64 *) pbuflist->virt;
        bpl->addrLow = le32_to_cpu(putPaddrLow(pcmd->phys));
        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pcmd->phys));
        bpl->tus.f.bdeSize = cmdSize;
        bpl->tus.f.bdeFlags = 0;
        bpl->tus.w = le32_to_cpu(bpl->tus.w);

        if (expectRsp) {
                bpl++;
                bpl->addrLow = le32_to_cpu(putPaddrLow(prsp->phys));
                bpl->addrHigh = le32_to_cpu(putPaddrHigh(prsp->phys));
                bpl->tus.f.bdeSize = FCELSSIZE;
                bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
                bpl->tus.w = le32_to_cpu(bpl->tus.w);
        }

        /* prevent preparing iocb with NULL ndlp reference */
        elsiocb->context1 = lpfc_nlp_get(ndlp);
        if (!elsiocb->context1)
                goto els_iocb_free_pbuf_exit;
        elsiocb->context2 = pcmd;
        elsiocb->context3 = pbuflist;
        elsiocb->retry = retry;
        elsiocb->vport = vport;
        elsiocb->drvrTimeout = (phba->fc_ratov << 1) + LPFC_DRVR_TIMEOUT;

        if (prsp) {
                list_add(&prsp->list, &pcmd->list);
        }
        if (expectRsp) {
                /* Xmit ELS command <elsCmd> to remote NPORT <did> */
                lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                                 "0116 Xmit ELS command x%x to remote "
                                 "NPORT x%x I/O tag: x%x, port state: x%x\n",
                                 elscmd, did, elsiocb->iotag,
                                 vport->port_state);
        } else {
                /* Xmit ELS response <elsCmd> to remote NPORT <did> */
                lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                                 "0117 Xmit ELS response x%x to remote "
                                 "NPORT x%x I/O tag: x%x, size: x%x\n",
                                 elscmd, ndlp->nlp_DID, elsiocb->iotag,
                                 cmdSize);
        }
        return elsiocb;

els_iocb_free_pbuf_exit:
        if (expectRsp)
                lpfc_mbuf_free(phba, prsp->virt, prsp->phys);
        kfree(pbuflist);

els_iocb_free_prsp_exit:
        lpfc_mbuf_free(phba, pcmd->virt, pcmd->phys);
        kfree(prsp);

els_iocb_free_pcmb_exit:
        kfree(pcmd);
        lpfc_sli_release_iocbq(phba, elsiocb);
        return NULL;
}

/**
 * lpfc_issue_fabric_reglogin - Issue fabric registration login for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues a fabric registration login for a @vport. An
 * active ndlp node with Fabric_DID must already exist for this @vport.
 * The routine invokes two mailbox commands to carry out fabric registration
 * login through the HBA firmware: the first mailbox command requests the
 * HBA to perform link configuration for the @vport; and the second mailbox
 * command requests the HBA to perform the actual fabric registration login
 * with the @vport.
 *
 * Return code
 *   0 - successfully issued fabric registration login for @vport
 *   -ENXIO -- failed to issue fabric registration login for @vport
 **/
int
lpfc_issue_fabric_reglogin(struct lpfc_vport *vport)
{
        struct lpfc_hba  *phba = vport->phba;
        LPFC_MBOXQ_t *mbox;
        struct lpfc_dmabuf *mp;
        struct lpfc_nodelist *ndlp;
        struct serv_parm *sp;
        int rc;
        int err = 0;

        sp = &phba->fc_fabparam;
        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                err = 1;
                goto fail;
        }

        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mbox) {
                err = 2;
                goto fail;
        }

        vport->port_state = LPFC_FABRIC_CFG_LINK;
        lpfc_config_link(phba, mbox);
        mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
        mbox->vport = vport;

        rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
        if (rc == MBX_NOT_FINISHED) {
                err = 3;
                goto fail_free_mbox;
        }

        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mbox) {
                err = 4;
                goto fail;
        }
        rc = lpfc_reg_rpi(phba, vport->vpi, Fabric_DID, (uint8_t *)sp, mbox,
                          ndlp->nlp_rpi);
        if (rc) {
                err = 5;
                goto fail_free_mbox;
        }

        mbox->mbox_cmpl = lpfc_mbx_cmpl_fabric_reg_login;
        mbox->vport = vport;
        /* increment the reference count on ndlp to hold reference
         * for the callback routine.
         */
        mbox->context2 = lpfc_nlp_get(ndlp);

        rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
        if (rc == MBX_NOT_FINISHED) {
                err = 6;
                goto fail_issue_reg_login;
        }

        return 0;

fail_issue_reg_login:
        /* decrement the reference count on ndlp just incremented
         * for the failed mbox command.
         */
        lpfc_nlp_put(ndlp);
        mp = (struct lpfc_dmabuf *) mbox->context1;
        lpfc_mbuf_free(phba, mp->virt, mp->phys);
        kfree(mp);
fail_free_mbox:
        mempool_free(mbox, phba->mbox_mem_pool);

fail:
        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                "0249 Cannot issue Register Fabric login: Err %d\n", err);
        return -ENXIO;
}

/**
 * lpfc_issue_reg_vfi - Register VFI for this vport's fabric login
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues a REG_VFI mailbox for the vfi, vpi, fcfi triplet for
 * the @vport. This mailbox command is necessary for FCoE only.
 *
 * Return code
 *   0 - successfully issued REG_VFI for @vport
 *   A failure code otherwise.
 **/
static int
lpfc_issue_reg_vfi(struct lpfc_vport *vport)
{
        struct lpfc_hba  *phba = vport->phba;
        LPFC_MBOXQ_t *mboxq;
        struct lpfc_nodelist *ndlp;
        struct serv_parm *sp;
        struct lpfc_dmabuf *dmabuf;
        int rc = 0;

        sp = &phba->fc_fabparam;
        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                rc = -ENODEV;
                goto fail;
        }

        dmabuf = kzalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (!dmabuf) {
                rc = -ENOMEM;
                goto fail;
        }
        dmabuf->virt = lpfc_mbuf_alloc(phba, MEM_PRI, &dmabuf->phys);
        if (!dmabuf->virt) {
                rc = -ENOMEM;
                goto fail_free_dmabuf;
        }

        mboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mboxq) {
                rc = -ENOMEM;
                goto fail_free_coherent;
        }
        vport->port_state = LPFC_FABRIC_CFG_LINK;
        memcpy(dmabuf->virt, &phba->fc_fabparam, sizeof(vport->fc_sparam));
        lpfc_reg_vfi(mboxq, vport, dmabuf->phys);
        mboxq->mbox_cmpl = lpfc_mbx_cmpl_reg_vfi;
        mboxq->vport = vport;
        mboxq->context1 = dmabuf;
        rc = lpfc_sli_issue_mbox(phba, mboxq, MBX_NOWAIT);
        if (rc == MBX_NOT_FINISHED) {
                rc = -ENXIO;
                goto fail_free_mbox;
        }
        return 0;

fail_free_mbox:
        mempool_free(mboxq, phba->mbox_mem_pool);
fail_free_coherent:
        lpfc_mbuf_free(phba, dmabuf->virt, dmabuf->phys);
fail_free_dmabuf:
        kfree(dmabuf);
fail:
        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                "0289 Issue Register VFI failed: Err %d\n", rc);
        return rc;
}

/**
 * lpfc_check_clean_addr_bit - Check whether assigned FCID is clean.
 * @vport: pointer to a host virtual N_Port data structure.
 * @sp: pointer to service parameter data structure.
 *
 * This routine is called from FLOGI/FDISC completion handler functions.
 * lpfc_check_clean_addr_bit return 1 when FCID/Fabric portname/ Fabric
 * node nodename is changed in the completion service parameter else return
 * 0. This function also set flag in the vport data structure to delay
 * NP_Port discovery after the FLOGI/FDISC completion if Clean address bit
 * in FLOGI/FDISC response is cleared and FCID/Fabric portname/ Fabric
 * node nodename is changed in the completion service parameter.
 *
 * Return code
 *   0 - FCID and Fabric Nodename and Fabric portname is not changed.
 *   1 - FCID or Fabric Nodename or Fabric portname is changed.
 *
 **/
static uint8_t
lpfc_check_clean_addr_bit(struct lpfc_vport *vport,
                struct serv_parm *sp)
{
        uint8_t fabric_param_changed = 0;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if ((vport->fc_prevDID != vport->fc_myDID) ||
                memcmp(&vport->fabric_portname, &sp->portName,
                        sizeof(struct lpfc_name)) ||
                memcmp(&vport->fabric_nodename, &sp->nodeName,
                        sizeof(struct lpfc_name)))
                fabric_param_changed = 1;

        /*
         * Word 1 Bit 31 in common service parameter is overloaded.
         * Word 1 Bit 31 in FLOGI request is multiple NPort request
         * Word 1 Bit 31 in FLOGI response is clean address bit
         *
         * If fabric parameter is changed and clean address bit is
         * cleared delay nport discovery if
         * - vport->fc_prevDID != 0 (not initial discovery) OR
         * - lpfc_delay_discovery module parameter is set.
         */
        if (fabric_param_changed && !sp->cmn.clean_address_bit &&
            (vport->fc_prevDID || lpfc_delay_discovery)) {
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_DISC_DELAYED;
                spin_unlock_irq(shost->host_lock);
        }

        return fabric_param_changed;
}


/**
 * lpfc_cmpl_els_flogi_fabric - Completion function for flogi to a fabric port
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @sp: pointer to service parameter data structure.
 * @irsp: pointer to the IOCB within the lpfc response IOCB.
 *
 * This routine is invoked by the lpfc_cmpl_els_flogi() completion callback
 * function to handle the completion of a Fabric Login (FLOGI) into a fabric
 * port in a fabric topology. It properly sets up the parameters to the @ndlp
 * from the IOCB response. It also check the newly assigned N_Port ID to the
 * @vport against the previously assigned N_Port ID. If it is different from
 * the previously assigned Destination ID (DID), the lpfc_unreg_rpi() routine
 * is invoked on all the remaining nodes with the @vport to unregister the
 * Remote Port Indicators (RPIs). Finally, the lpfc_issue_fabric_reglogin()
 * is invoked to register login to the fabric.
 *
 * Return code
 *   0 - Success (currently, always return 0)
 **/
static int
lpfc_cmpl_els_flogi_fabric(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           struct serv_parm *sp, IOCB_t *irsp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_nodelist *np;
        struct lpfc_nodelist *next_np;
        uint8_t fabric_param_changed;

        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_FABRIC;
        spin_unlock_irq(shost->host_lock);

        phba->fc_edtov = be32_to_cpu(sp->cmn.e_d_tov);
        if (sp->cmn.edtovResolution)    /* E_D_TOV ticks are in nanoseconds */
                phba->fc_edtov = (phba->fc_edtov + 999999) / 1000000;

        phba->fc_edtovResol = sp->cmn.edtovResolution;
        phba->fc_ratov = (be32_to_cpu(sp->cmn.w2.r_a_tov) + 999) / 1000;

        if (phba->fc_topology == LPFC_TOPOLOGY_LOOP) {
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_PUBLIC_LOOP;
                spin_unlock_irq(shost->host_lock);
        }

        vport->fc_myDID = irsp->un.ulpWord[4] & Mask_DID;
        memcpy(&ndlp->nlp_portname, &sp->portName, sizeof(struct lpfc_name));
        memcpy(&ndlp->nlp_nodename, &sp->nodeName, sizeof(struct lpfc_name));
        ndlp->nlp_class_sup = 0;
        if (sp->cls1.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS1;
        if (sp->cls2.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS2;
        if (sp->cls3.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS3;
        if (sp->cls4.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS4;
        ndlp->nlp_maxframe = ((sp->cmn.bbRcvSizeMsb & 0x0F) << 8) |
                                sp->cmn.bbRcvSizeLsb;

        fabric_param_changed = lpfc_check_clean_addr_bit(vport, sp);
        memcpy(&vport->fabric_portname, &sp->portName,
                        sizeof(struct lpfc_name));
        memcpy(&vport->fabric_nodename, &sp->nodeName,
                        sizeof(struct lpfc_name));
        memcpy(&phba->fc_fabparam, sp, sizeof(struct serv_parm));

        if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
                if (sp->cmn.response_multiple_NPort) {
                        lpfc_printf_vlog(vport, KERN_WARNING,
                                         LOG_ELS | LOG_VPORT,
                                         "1816 FLOGI NPIV supported, "
                                         "response data 0x%x\n",
                                         sp->cmn.response_multiple_NPort);
                        phba->link_flag |= LS_NPIV_FAB_SUPPORTED;
                } else {
                        /* Because we asked f/w for NPIV it still expects us
                        to call reg_vnpid atleast for the physcial host */
                        lpfc_printf_vlog(vport, KERN_WARNING,
                                         LOG_ELS | LOG_VPORT,
                                         "1817 Fabric does not support NPIV "
                                         "- configuring single port mode.\n");
                        phba->link_flag &= ~LS_NPIV_FAB_SUPPORTED;
                }
        }

        if (fabric_param_changed &&
                !(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) {

                /* If our NportID changed, we need to ensure all
                 * remaining NPORTs get unreg_login'ed.
                 */
                list_for_each_entry_safe(np, next_np,
                                        &vport->fc_nodes, nlp_listp) {
                        if (!NLP_CHK_NODE_ACT(np))
                                continue;
                        if ((np->nlp_state != NLP_STE_NPR_NODE) ||
                                   !(np->nlp_flag & NLP_NPR_ADISC))
                                continue;
                        spin_lock_irq(shost->host_lock);
                        np->nlp_flag &= ~NLP_NPR_ADISC;
                        spin_unlock_irq(shost->host_lock);
                        lpfc_unreg_rpi(vport, np);
                }
                lpfc_cleanup_pending_mbox(vport);

                if (phba->sli_rev == LPFC_SLI_REV4) {
                        lpfc_sli4_unreg_all_rpis(vport);
                        lpfc_mbx_unreg_vpi(vport);
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
                        /*
                        * If VPI is unreged, driver need to do INIT_VPI
                        * before re-registering
                        */
                        vport->fc_flag |= FC_VPORT_NEEDS_INIT_VPI;
                        spin_unlock_irq(shost->host_lock);
                }
        } else if ((phba->sli_rev == LPFC_SLI_REV4) &&
                !(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) {
                        /*
                         * Driver needs to re-reg VPI in order for f/w
                         * to update the MAC address.
                         */
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
                        lpfc_register_new_vport(phba, vport, ndlp);
                        return 0;
        }

        if (phba->sli_rev < LPFC_SLI_REV4) {
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_REG_LOGIN_ISSUE);
                if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED &&
                    vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)
                        lpfc_register_new_vport(phba, vport, ndlp);
                else
                        lpfc_issue_fabric_reglogin(vport);
        } else {
                ndlp->nlp_type |= NLP_FABRIC;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
                if ((!(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) &&
                        (vport->vpi_state & LPFC_VPI_REGISTERED)) {
                        lpfc_start_fdiscs(phba);
                        lpfc_do_scr_ns_plogi(phba, vport);
                } else if (vport->fc_flag & FC_VFI_REGISTERED)
                        lpfc_issue_init_vpi(vport);
                else
                        lpfc_issue_reg_vfi(vport);
        }
        return 0;
}
/**
 * lpfc_cmpl_els_flogi_nport - Completion function for flogi to an N_Port
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @sp: pointer to service parameter data structure.
 *
 * This routine is invoked by the lpfc_cmpl_els_flogi() completion callback
 * function to handle the completion of a Fabric Login (FLOGI) into an N_Port
 * in a point-to-point topology. First, the @vport's N_Port Name is compared
 * with the received N_Port Name: if the @vport's N_Port Name is greater than
 * the received N_Port Name lexicographically, this node shall assign local
 * N_Port ID (PT2PT_LocalID: 1) and remote N_Port ID (PT2PT_RemoteID: 2) and
 * will send out Port Login (PLOGI) with the N_Port IDs assigned. Otherwise,
 * this node shall just wait for the remote node to issue PLOGI and assign
 * N_Port IDs.
 *
 * Return code
 *   0 - Success
 *   -ENXIO - Fail
 **/
static int
lpfc_cmpl_els_flogi_nport(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          struct serv_parm *sp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        LPFC_MBOXQ_t *mbox;
        int rc;

        spin_lock_irq(shost->host_lock);
        vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
        spin_unlock_irq(shost->host_lock);

        phba->fc_edtov = FF_DEF_EDTOV;
        phba->fc_ratov = FF_DEF_RATOV;
        rc = memcmp(&vport->fc_portname, &sp->portName,
                    sizeof(vport->fc_portname));
        if (rc >= 0) {
                /* This side will initiate the PLOGI */
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_PT2PT_PLOGI;
                spin_unlock_irq(shost->host_lock);

                /*
                 * N_Port ID cannot be 0, set our to LocalID the other
                 * side will be RemoteID.
                 */

                /* not equal */
                if (rc)
                        vport->fc_myDID = PT2PT_LocalID;

                mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
                if (!mbox)
                        goto fail;

                lpfc_config_link(phba, mbox);

                mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                mbox->vport = vport;
                rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
                if (rc == MBX_NOT_FINISHED) {
                        mempool_free(mbox, phba->mbox_mem_pool);
                        goto fail;
                }
                /* Decrement ndlp reference count indicating that ndlp can be
                 * safely released when other references to it are done.
                 */
                lpfc_nlp_put(ndlp);

                ndlp = lpfc_findnode_did(vport, PT2PT_RemoteID);
                if (!ndlp) {
                        /*
                         * Cannot find existing Fabric ndlp, so allocate a
                         * new one
                         */
                        ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                        if (!ndlp)
                                goto fail;
                        lpfc_nlp_init(vport, ndlp, PT2PT_RemoteID);
                } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                        ndlp = lpfc_enable_node(vport, ndlp,
                                                NLP_STE_UNUSED_NODE);
                        if(!ndlp)
                                goto fail;
                }

                memcpy(&ndlp->nlp_portname, &sp->portName,
                       sizeof(struct lpfc_name));
                memcpy(&ndlp->nlp_nodename, &sp->nodeName,
                       sizeof(struct lpfc_name));
                /* Set state will put ndlp onto node list if not already done */
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
        } else
                /* This side will wait for the PLOGI, decrement ndlp reference
                 * count indicating that ndlp can be released when other
                 * references to it are done.
                 */
                lpfc_nlp_put(ndlp);

        /* If we are pt2pt with another NPort, force NPIV off! */
        phba->sli3_options &= ~LPFC_SLI3_NPIV_ENABLED;

        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_PT2PT;
        spin_unlock_irq(shost->host_lock);

        /* Start discovery - this should just do CLEAR_LA */
        lpfc_disc_start(vport);
        return 0;
fail:
        return -ENXIO;
}

/**
 * lpfc_cmpl_els_flogi - Completion callback function for flogi
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the top-level completion callback function for issuing
 * a Fabric Login (FLOGI) command. If the response IOCB reported error,
 * the lpfc_els_retry() routine shall be invoked to retry the FLOGI. If
 * retry has been made (either immediately or delayed with lpfc_els_retry()
 * returning 1), the command IOCB will be released and function returned.
 * If the retry attempt has been given up (possibly reach the maximum
 * number of retries), one additional decrement of ndlp reference shall be
 * invoked before going out after releasing the command IOCB. This will
 * actually release the remote node (Note, lpfc_els_free_iocb() will also
 * invoke one decrement of ndlp reference count). If no error reported in
 * the IOCB status, the command Port ID field is used to determine whether
 * this is a point-to-point topology or a fabric topology: if the Port ID
 * field is assigned, it is a fabric topology; otherwise, it is a
 * point-to-point topology. The routine lpfc_cmpl_els_flogi_fabric() or
 * lpfc_cmpl_els_flogi_nport() shall be invoked accordingly to handle the
 * specific topology completion conditions.
 **/
static void
lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp = &rspiocb->iocb;
        struct lpfc_nodelist *ndlp = cmdiocb->context1;
        struct lpfc_dmabuf *pcmd = cmdiocb->context2, *prsp;
        struct serv_parm *sp;
        uint16_t fcf_index;
        int rc;

        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport)) {
                /* One additional decrement on node reference count to
                 * trigger the release of the node
                 */
                lpfc_nlp_put(ndlp);
                goto out;
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "FLOGI cmpl:      status:x%x/x%x state:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                vport->port_state);

        if (irsp->ulpStatus) {
                /*
                 * In case of FIP mode, perform roundrobin FCF failover
                 * due to new FCF discovery
                 */
                if ((phba->hba_flag & HBA_FIP_SUPPORT) &&
                    (phba->fcf.fcf_flag & FCF_DISCOVERY) &&
                    !((irsp->ulpStatus == IOSTAT_LOCAL_REJECT) &&
                     (irsp->un.ulpWord[4] == IOERR_SLI_ABORTED))) {
                        lpfc_printf_log(phba, KERN_WARNING, LOG_FIP | LOG_ELS,
                                        "2611 FLOGI failed on FCF (x%x), "
                                        "status:x%x/x%x, tmo:x%x, perform "
                                        "roundrobin FCF failover\n",
                                        phba->fcf.current_rec.fcf_indx,
                                        irsp->ulpStatus, irsp->un.ulpWord[4],
                                        irsp->ulpTimeout);
                        lpfc_sli4_set_fcf_flogi_fail(phba,
                                        phba->fcf.current_rec.fcf_indx);
                        fcf_index = lpfc_sli4_fcf_rr_next_index_get(phba);
                        rc = lpfc_sli4_fcf_rr_next_proc(vport, fcf_index);
                        if (rc)
                                goto out;
                }

                /* FLOGI failure */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                "2858 FLOGI failure Status:x%x/x%x TMO:x%x\n",
                                irsp->ulpStatus, irsp->un.ulpWord[4],
                                irsp->ulpTimeout);

                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb))
                        goto out;

                /* FLOGI failure */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0100 FLOGI failure Status:x%x/x%x TMO:x%x\n",
                                 irsp->ulpStatus, irsp->un.ulpWord[4],
                                 irsp->ulpTimeout);

                /* FLOGI failed, so there is no fabric */
                spin_lock_irq(shost->host_lock);
                vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
                spin_unlock_irq(shost->host_lock);

                /* If private loop, then allow max outstanding els to be
                 * LPFC_MAX_DISC_THREADS (32). Scanning in the case of no
                 * alpa map would take too long otherwise.
                 */
                if (phba->alpa_map[0] == 0) {
                        vport->cfg_discovery_threads = LPFC_MAX_DISC_THREADS;
                        if ((phba->sli_rev == LPFC_SLI_REV4) &&
                            (!(vport->fc_flag & FC_VFI_REGISTERED) ||
                             (vport->fc_prevDID != vport->fc_myDID))) {
                                if (vport->fc_flag & FC_VFI_REGISTERED)
                                        lpfc_sli4_unreg_all_rpis(vport);
                                lpfc_issue_reg_vfi(vport);
                                lpfc_nlp_put(ndlp);
                                goto out;
                        }
                }
                goto flogifail;
        }
        spin_lock_irq(shost->host_lock);
        vport->fc_flag &= ~FC_VPORT_CVL_RCVD;
        vport->fc_flag &= ~FC_VPORT_LOGO_RCVD;
        spin_unlock_irq(shost->host_lock);

        /*
         * The FLogI succeeded.  Sync the data for the CPU before
         * accessing it.
         */
        prsp = list_get_first(&pcmd->list, struct lpfc_dmabuf, list);

        sp = prsp->virt + sizeof(uint32_t);

        /* FLOGI completes successfully */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0101 FLOGI completes successfully "
                         "Data: x%x x%x x%x x%x\n",
                         irsp->un.ulpWord[4], sp->cmn.e_d_tov,
                         sp->cmn.w2.r_a_tov, sp->cmn.edtovResolution);

        if (vport->port_state == LPFC_FLOGI) {
                /*
                 * If Common Service Parameters indicate Nport
                 * we are point to point, if Fport we are Fabric.
                 */
                if (sp->cmn.fPort)
                        rc = lpfc_cmpl_els_flogi_fabric(vport, ndlp, sp, irsp);
                else if (!(phba->hba_flag & HBA_FCOE_MODE))
                        rc = lpfc_cmpl_els_flogi_nport(vport, ndlp, sp);
                else {
                        lpfc_printf_vlog(vport, KERN_ERR,
                                LOG_FIP | LOG_ELS,
                                "2831 FLOGI response with cleared Fabric "
                                "bit fcf_index 0x%x "
                                "Switch Name %02x%02x%02x%02x%02x%02x%02x%02x "
                                "Fabric Name "
                                "%02x%02x%02x%02x%02x%02x%02x%02x\n",
                                phba->fcf.current_rec.fcf_indx,
                                phba->fcf.current_rec.switch_name[0],
                                phba->fcf.current_rec.switch_name[1],
                                phba->fcf.current_rec.switch_name[2],
                                phba->fcf.current_rec.switch_name[3],
                                phba->fcf.current_rec.switch_name[4],
                                phba->fcf.current_rec.switch_name[5],
                                phba->fcf.current_rec.switch_name[6],
                                phba->fcf.current_rec.switch_name[7],
                                phba->fcf.current_rec.fabric_name[0],
                                phba->fcf.current_rec.fabric_name[1],
                                phba->fcf.current_rec.fabric_name[2],
                                phba->fcf.current_rec.fabric_name[3],
                                phba->fcf.current_rec.fabric_name[4],
                                phba->fcf.current_rec.fabric_name[5],
                                phba->fcf.current_rec.fabric_name[6],
                                phba->fcf.current_rec.fabric_name[7]);
                        lpfc_nlp_put(ndlp);
                        spin_lock_irq(&phba->hbalock);
                        phba->fcf.fcf_flag &= ~FCF_DISCOVERY;
                        phba->hba_flag &= ~(FCF_RR_INPROG | HBA_DEVLOSS_TMO);
                        spin_unlock_irq(&phba->hbalock);
                        goto out;
                }
                if (!rc) {
                        /* Mark the FCF discovery process done */
                        if (phba->hba_flag & HBA_FIP_SUPPORT)
                                lpfc_printf_vlog(vport, KERN_INFO, LOG_FIP |
                                                LOG_ELS,
                                                "2769 FLOGI to FCF (x%x) "
                                                "completed successfully\n",
                                                phba->fcf.current_rec.fcf_indx);
                        spin_lock_irq(&phba->hbalock);
                        phba->fcf.fcf_flag &= ~FCF_DISCOVERY;
                        phba->hba_flag &= ~(FCF_RR_INPROG | HBA_DEVLOSS_TMO);
                        spin_unlock_irq(&phba->hbalock);
                        goto out;
                }
        }

flogifail:
        lpfc_nlp_put(ndlp);

        if (!lpfc_error_lost_link(irsp)) {
                /* FLOGI failed, so just use loop map to make discovery list */
                lpfc_disc_list_loopmap(vport);

                /* Start discovery */
                lpfc_disc_start(vport);
        } else if (((irsp->ulpStatus != IOSTAT_LOCAL_REJECT) ||
                        ((irsp->un.ulpWord[4] != IOERR_SLI_ABORTED) &&
                        (irsp->un.ulpWord[4] != IOERR_SLI_DOWN))) &&
                        (phba->link_state != LPFC_CLEAR_LA)) {
                /* If FLOGI failed enable link interrupt. */
                lpfc_issue_clear_la(phba, vport);
        }
out:
        lpfc_els_free_iocb(phba, cmdiocb);
}

/**
 * lpfc_issue_els_flogi - Issue an flogi iocb command for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Fabric Login (FLOGI) Request ELS command
 * for a @vport. The initiator service parameters are put into the payload
 * of the FLOGI Request IOCB and the top-level callback function pointer
 * to lpfc_cmpl_els_flogi() routine is put to the IOCB completion callback
 * function field. The lpfc_issue_fabric_iocb routine is invoked to send
 * out FLOGI ELS command with one outstanding fabric IOCB at a time.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the FLOGI ELS command.
 *
 * Return code
 *   0 - successfully issued flogi iocb for @vport
 *   1 - failed to issue flogi iocb for @vport
 **/
static int
lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        struct serv_parm *sp;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        uint8_t *pcmd;
        uint16_t cmdsize;
        uint32_t tmo;
        int rc;

        pring = &phba->sli.ring[LPFC_ELS_RING];

        cmdsize = (sizeof(uint32_t) + sizeof(struct serv_parm));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_FLOGI);

        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For FLOGI request, remainder of payload is service parameters */
        *((uint32_t *) (pcmd)) = ELS_CMD_FLOGI;
        pcmd += sizeof(uint32_t);
        memcpy(pcmd, &vport->fc_sparam, sizeof(struct serv_parm));
        sp = (struct serv_parm *) pcmd;

        /* Setup CSPs accordingly for Fabric */
        sp->cmn.e_d_tov = 0;
        sp->cmn.w2.r_a_tov = 0;
        sp->cls1.classValid = 0;
        sp->cls2.seqDelivery = 1;
        sp->cls3.seqDelivery = 1;
        if (sp->cmn.fcphLow < FC_PH3)
                sp->cmn.fcphLow = FC_PH3;
        if (sp->cmn.fcphHigh < FC_PH3)
                sp->cmn.fcphHigh = FC_PH3;

        if  (phba->sli_rev == LPFC_SLI_REV4) {
                if (bf_get(lpfc_sli_intf_if_type, &phba->sli4_hba.sli_intf) ==
                    LPFC_SLI_INTF_IF_TYPE_0) {
                        elsiocb->iocb.ulpCt_h = ((SLI4_CT_FCFI >> 1) & 1);
                        elsiocb->iocb.ulpCt_l = (SLI4_CT_FCFI & 1);
                        /* FLOGI needs to be 3 for WQE FCFI */
                        /* Set the fcfi to the fcfi we registered with */
                        elsiocb->iocb.ulpContext = phba->fcf.fcfi;
                }
        } else {
                if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
                        sp->cmn.request_multiple_Nport = 1;
                        /* For FLOGI, Let FLOGI rsp set the NPortID for VPI 0 */
                        icmd->ulpCt_h = 1;
                        icmd->ulpCt_l = 0;
                } else
                        sp->cmn.request_multiple_Nport = 0;
        }

        if (phba->fc_topology != LPFC_TOPOLOGY_LOOP) {
                icmd->un.elsreq64.myID = 0;
                icmd->un.elsreq64.fl = 1;
        }

        tmo = phba->fc_ratov;
        phba->fc_ratov = LPFC_DISC_FLOGI_TMO;
        lpfc_set_disctmo(vport);
        phba->fc_ratov = tmo;

        phba->fc_stat.elsXmitFLOGI++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_flogi;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue FLOGI:     opt:x%x",
                phba->sli3_options, 0, 0);

        rc = lpfc_issue_fabric_iocb(phba, elsiocb);
        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_abort_flogi - Abort all outstanding flogi iocbs
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine aborts all the outstanding Fabric Login (FLOGI) IOCBs
 * with a @phba. This routine walks all the outstanding IOCBs on the txcmplq
 * list and issues an abort IOCB commond on each outstanding IOCB that
 * contains a active Fabric_DID ndlp. Note that this function is to issue
 * the abort IOCB command on all the outstanding IOCBs, thus when this
 * function returns, it does not guarantee all the IOCBs are actually aborted.
 *
 * Return code
 *   0 - Successfully issued abort iocb on all outstanding flogis (Always 0)
 **/
int
lpfc_els_abort_flogi(struct lpfc_hba *phba)
{
        struct lpfc_sli_ring *pring;
        struct lpfc_iocbq *iocb, *next_iocb;
        struct lpfc_nodelist *ndlp;
        IOCB_t *icmd;

        /* Abort outstanding I/O on NPort <nlp_DID> */
        lpfc_printf_log(phba, KERN_INFO, LOG_DISCOVERY,
                        "0201 Abort outstanding I/O on NPort x%x\n",
                        Fabric_DID);

        pring = &phba->sli.ring[LPFC_ELS_RING];

        /*
         * Check the txcmplq for an iocb that matches the nport the driver is
         * searching for.
         */
        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(iocb, next_iocb, &pring->txcmplq, list) {
                icmd = &iocb->iocb;
                if (icmd->ulpCommand == CMD_ELS_REQUEST64_CR &&
                    icmd->un.elsreq64.bdl.ulpIoTag32) {
                        ndlp = (struct lpfc_nodelist *)(iocb->context1);
                        if (ndlp && NLP_CHK_NODE_ACT(ndlp) &&
                            (ndlp->nlp_DID == Fabric_DID))
                                lpfc_sli_issue_abort_iotag(phba, pring, iocb);
                }
        }
        spin_unlock_irq(&phba->hbalock);

        return 0;
}

/**
 * lpfc_initial_flogi - Issue an initial fabric login for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues an initial Fabric Login (FLOGI) for the @vport
 * specified. It first searches the ndlp with the Fabric_DID (0xfffffe) from
 * the @vport's ndlp list. If no such ndlp found, it will create an ndlp and
 * put it into the @vport's ndlp list. If an inactive ndlp found on the list,
 * it will just be enabled and made active. The lpfc_issue_els_flogi() routine
 * is then invoked with the @vport and the ndlp to perform the FLOGI for the
 * @vport.
 *
 * Return code
 *   0 - failed to issue initial flogi for @vport
 *   1 - successfully issued initial flogi for @vport
 **/
int
lpfc_initial_flogi(struct lpfc_vport *vport)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_nodelist *ndlp;

        vport->port_state = LPFC_FLOGI;
        lpfc_set_disctmo(vport);

        /* First look for the Fabric ndlp */
        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (!ndlp) {
                /* Cannot find existing Fabric ndlp, so allocate a new one */
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 0;
                lpfc_nlp_init(vport, ndlp, Fabric_DID);
                /* Set the node type */
                ndlp->nlp_type |= NLP_FABRIC;
                /* Put ndlp onto node list */
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                /* re-setup ndlp without removing from node list */
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 0;
        }

        if (lpfc_issue_els_flogi(vport, ndlp, 0)) {
                /* This decrement of reference count to node shall kick off
                 * the release of the node.
                 */
                lpfc_nlp_put(ndlp);
                return 0;
        }
        return 1;
}

/**
 * lpfc_initial_fdisc - Issue an initial fabric discovery for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues an initial Fabric Discover (FDISC) for the @vport
 * specified. It first searches the ndlp with the Fabric_DID (0xfffffe) from
 * the @vport's ndlp list. If no such ndlp found, it will create an ndlp and
 * put it into the @vport's ndlp list. If an inactive ndlp found on the list,
 * it will just be enabled and made active. The lpfc_issue_els_fdisc() routine
 * is then invoked with the @vport and the ndlp to perform the FDISC for the
 * @vport.
 *
 * Return code
 *   0 - failed to issue initial fdisc for @vport
 *   1 - successfully issued initial fdisc for @vport
 **/
int
lpfc_initial_fdisc(struct lpfc_vport *vport)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_nodelist *ndlp;

        /* First look for the Fabric ndlp */
        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (!ndlp) {
                /* Cannot find existing Fabric ndlp, so allocate a new one */
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 0;
                lpfc_nlp_init(vport, ndlp, Fabric_DID);
                /* Put ndlp onto node list */
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                /* re-setup ndlp without removing from node list */
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 0;
        }

        if (lpfc_issue_els_fdisc(vport, ndlp, 0)) {
                /* decrement node reference count to trigger the release of
                 * the node.
                 */
                lpfc_nlp_put(ndlp);
                return 0;
        }
        return 1;
}

/**
 * lpfc_more_plogi - Check and issue remaining plogis for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine checks whether there are more remaining Port Logins
 * (PLOGI) to be issued for the @vport. If so, it will invoke the routine
 * lpfc_els_disc_plogi() to go through the Node Port Recovery (NPR) nodes
 * to issue ELS PLOGIs up to the configured discover threads with the
 * @vport (@vport->cfg_discovery_threads). The function also decrement
 * the @vport's num_disc_node by 1 if it is not already 0.
 **/
void
lpfc_more_plogi(struct lpfc_vport *vport)
{
        int sentplogi;

        if (vport->num_disc_nodes)
                vport->num_disc_nodes--;

        /* Continue discovery with <num_disc_nodes> PLOGIs to go */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                         "0232 Continue discovery with %d PLOGIs to go "
                         "Data: x%x x%x x%x\n",
                         vport->num_disc_nodes, vport->fc_plogi_cnt,
                         vport->fc_flag, vport->port_state);
        /* Check to see if there are more PLOGIs to be sent */
        if (vport->fc_flag & FC_NLP_MORE)
                /* go thru NPR nodes and issue any remaining ELS PLOGIs */
                sentplogi = lpfc_els_disc_plogi(vport);

        return;
}

/**
 * lpfc_plogi_confirm_nport - Confirm pologi wwpn matches stored ndlp
 * @phba: pointer to lpfc hba data structure.
 * @prsp: pointer to response IOCB payload.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine checks and indicates whether the WWPN of an N_Port, retrieved
 * from a PLOGI, matches the WWPN that is stored in the @ndlp for that N_POrt.
 * The following cases are considered N_Port confirmed:
 * 1) The N_Port is a Fabric ndlp; 2) The @ndlp is on vport list and matches
 * the WWPN of the N_Port logged into; 3) The @ndlp is not on vport list but
 * it does not have WWPN assigned either. If the WWPN is confirmed, the
 * pointer to the @ndlp will be returned. If the WWPN is not confirmed:
 * 1) if there is a node on vport list other than the @ndlp with the same
 * WWPN of the N_Port PLOGI logged into, the lpfc_unreg_rpi() will be invoked
 * on that node to release the RPI associated with the node; 2) if there is
 * no node found on vport list with the same WWPN of the N_Port PLOGI logged
 * into, a new node shall be allocated (or activated). In either case, the
 * parameters of the @ndlp shall be copied to the new_ndlp, the @ndlp shall
 * be released and the new_ndlp shall be put on to the vport node list and
 * its pointer returned as the confirmed node.
 *
 * Note that before the @ndlp got "released", the keepDID from not-matching
 * or inactive "new_ndlp" on the vport node list is assigned to the nlp_DID
 * of the @ndlp. This is because the release of @ndlp is actually to put it
 * into an inactive state on the vport node list and the vport node list
 * management algorithm does not allow two node with a same DID.
 *
 * Return code
 *   pointer to the PLOGI N_Port @ndlp
 **/
static struct lpfc_nodelist *
lpfc_plogi_confirm_nport(struct lpfc_hba *phba, uint32_t *prsp,
                         struct lpfc_nodelist *ndlp)
{
        struct lpfc_vport    *vport = ndlp->vport;
        struct lpfc_nodelist *new_ndlp;
        struct lpfc_rport_data *rdata;
        struct fc_rport *rport;
        struct serv_parm *sp;
        uint8_t  name[sizeof(struct lpfc_name)];
        uint32_t rc, keepDID = 0;
        int  put_node;
        int  put_rport;
        struct lpfc_node_rrqs rrq;

        /* Fabric nodes can have the same WWPN so we don't bother searching
         * by WWPN.  Just return the ndlp that was given to us.
         */
        if (ndlp->nlp_type & NLP_FABRIC)
                return ndlp;

        sp = (struct serv_parm *) ((uint8_t *) prsp + sizeof(uint32_t));
        memset(name, 0, sizeof(struct lpfc_name));

        /* Now we find out if the NPort we are logging into, matches the WWPN
         * we have for that ndlp. If not, we have some work to do.
         */
        new_ndlp = lpfc_findnode_wwpn(vport, &sp->portName);

        if (new_ndlp == ndlp && NLP_CHK_NODE_ACT(new_ndlp))
                return ndlp;
        memset(&rrq.xri_bitmap, 0, sizeof(new_ndlp->active_rrqs.xri_bitmap));

        if (!new_ndlp) {
                rc = memcmp(&ndlp->nlp_portname, name,
                            sizeof(struct lpfc_name));
                if (!rc)
                        return ndlp;
                new_ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_ATOMIC);
                if (!new_ndlp)
                        return ndlp;
                lpfc_nlp_init(vport, new_ndlp, ndlp->nlp_DID);
        } else if (!NLP_CHK_NODE_ACT(new_ndlp)) {
                rc = memcmp(&ndlp->nlp_portname, name,
                            sizeof(struct lpfc_name));
                if (!rc)
                        return ndlp;
                new_ndlp = lpfc_enable_node(vport, new_ndlp,
                                                NLP_STE_UNUSED_NODE);
                if (!new_ndlp)
                        return ndlp;
                keepDID = new_ndlp->nlp_DID;
                if (phba->sli_rev == LPFC_SLI_REV4)
                        memcpy(&rrq.xri_bitmap,
                                &new_ndlp->active_rrqs.xri_bitmap,
                                sizeof(new_ndlp->active_rrqs.xri_bitmap));
        } else {
                keepDID = new_ndlp->nlp_DID;
                if (phba->sli_rev == LPFC_SLI_REV4)
                        memcpy(&rrq.xri_bitmap,
                                &new_ndlp->active_rrqs.xri_bitmap,
                                sizeof(new_ndlp->active_rrqs.xri_bitmap));
        }

        lpfc_unreg_rpi(vport, new_ndlp);
        new_ndlp->nlp_DID = ndlp->nlp_DID;
        new_ndlp->nlp_prev_state = ndlp->nlp_prev_state;
        if (phba->sli_rev == LPFC_SLI_REV4)
                memcpy(new_ndlp->active_rrqs.xri_bitmap,
                        &ndlp->active_rrqs.xri_bitmap,
                        sizeof(ndlp->active_rrqs.xri_bitmap));

        if (ndlp->nlp_flag & NLP_NPR_2B_DISC)
                new_ndlp->nlp_flag |= NLP_NPR_2B_DISC;
        ndlp->nlp_flag &= ~NLP_NPR_2B_DISC;

        /* Set state will put new_ndlp on to node list if not already done */
        lpfc_nlp_set_state(vport, new_ndlp, ndlp->nlp_state);

        /* Move this back to NPR state */
        if (memcmp(&ndlp->nlp_portname, name, sizeof(struct lpfc_name)) == 0) {
                /* The new_ndlp is replacing ndlp totally, so we need
                 * to put ndlp on UNUSED list and try to free it.
                 */

                /* Fix up the rport accordingly */
                rport =  ndlp->rport;
                if (rport) {
                        rdata = rport->dd_data;
                        if (rdata->pnode == ndlp) {
                                lpfc_nlp_put(ndlp);
                                ndlp->rport = NULL;
                                rdata->pnode = lpfc_nlp_get(new_ndlp);
                                new_ndlp->rport = rport;
                        }
                        new_ndlp->nlp_type = ndlp->nlp_type;
                }
                /* We shall actually free the ndlp with both nlp_DID and
                 * nlp_portname fields equals 0 to avoid any ndlp on the
                 * nodelist never to be used.
                 */
                if (ndlp->nlp_DID == 0) {
                        spin_lock_irq(&phba->ndlp_lock);
                        NLP_SET_FREE_REQ(ndlp);
                        spin_unlock_irq(&phba->ndlp_lock);
                }

                /* Two ndlps cannot have the same did on the nodelist */
                ndlp->nlp_DID = keepDID;
                if (phba->sli_rev == LPFC_SLI_REV4)
                        memcpy(&ndlp->active_rrqs.xri_bitmap,
                                &rrq.xri_bitmap,
                                sizeof(ndlp->active_rrqs.xri_bitmap));
                lpfc_drop_node(vport, ndlp);
        }
        else {
                lpfc_unreg_rpi(vport, ndlp);
                /* Two ndlps cannot have the same did */
                ndlp->nlp_DID = keepDID;
                if (phba->sli_rev == LPFC_SLI_REV4)
                        memcpy(&ndlp->active_rrqs.xri_bitmap,
                                &rrq.xri_bitmap,
                                sizeof(ndlp->active_rrqs.xri_bitmap));
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                /* Since we are swapping the ndlp passed in with the new one
                 * and the did has already been swapped, copy over the
                 * state and names.
                 */
                memcpy(&new_ndlp->nlp_portname, &ndlp->nlp_portname,
                        sizeof(struct lpfc_name));
                memcpy(&new_ndlp->nlp_nodename, &ndlp->nlp_nodename,
                        sizeof(struct lpfc_name));
                new_ndlp->nlp_state = ndlp->nlp_state;
                /* Fix up the rport accordingly */
                rport = ndlp->rport;
                if (rport) {
                        rdata = rport->dd_data;
                        put_node = rdata->pnode != NULL;
                        put_rport = ndlp->rport != NULL;
                        rdata->pnode = NULL;
                        ndlp->rport = NULL;
                        if (put_node)
                                lpfc_nlp_put(ndlp);
                        if (put_rport)
                                put_device(&rport->dev);
                }
        }
        return new_ndlp;
}

/**
 * lpfc_end_rscn - Check and handle more rscn for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine checks whether more Registration State Change
 * Notifications (RSCNs) came in while the discovery state machine was in
 * the FC_RSCN_MODE. If so, the lpfc_els_handle_rscn() routine will be
 * invoked to handle the additional RSCNs for the @vport. Otherwise, the
 * FC_RSCN_MODE bit will be cleared with the @vport to mark as the end of
 * handling the RSCNs.
 **/
void
lpfc_end_rscn(struct lpfc_vport *vport)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (vport->fc_flag & FC_RSCN_MODE) {
                /*
                 * Check to see if more RSCNs came in while we were
                 * processing this one.
                 */
                if (vport->fc_rscn_id_cnt ||
                    (vport->fc_flag & FC_RSCN_DISCOVERY) != 0)
                        lpfc_els_handle_rscn(vport);
                else {
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag &= ~FC_RSCN_MODE;
                        spin_unlock_irq(shost->host_lock);
                }
        }
}

/**
 * lpfc_cmpl_els_rrq - Completion handled for els RRQs.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine will call the clear rrq function to free the rrq and
 * clear the xri's bit in the ndlp's xri_bitmap. If the ndlp does not
 * exist then the clear_rrq is still called because the rrq needs to
 * be freed.
 **/

static void
lpfc_cmpl_els_rrq(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        IOCB_t *irsp;
        struct lpfc_nodelist *ndlp;
        struct lpfc_node_rrq *rrq;

        /* we pass cmdiocb to state machine which needs rspiocb as well */
        rrq = cmdiocb->context_un.rrq;
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &rspiocb->iocb;
        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "RRQ cmpl:      status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                irsp->un.elsreq64.remoteID);

        ndlp = lpfc_findnode_did(vport, irsp->un.elsreq64.remoteID);
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp) || ndlp != rrq->ndlp) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "2882 RRQ completes to NPort x%x "
                                 "with no ndlp. Data: x%x x%x x%x\n",
                                 irsp->un.elsreq64.remoteID,
                                 irsp->ulpStatus, irsp->un.ulpWord[4],
                                 irsp->ulpIoTag);
                goto out;
        }

        /* rrq completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "2880 RRQ completes to NPort x%x "
                         "Data: x%x x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, rrq->xritag, rrq->rxid);

        if (irsp->ulpStatus) {
                /* Check for retry */
                /* RRQ failed Don't print the vport to vport rjts */
                if (irsp->ulpStatus != IOSTAT_LS_RJT ||
                        (((irsp->un.ulpWord[4]) >> 16 != LSRJT_INVALID_CMD) &&
                        ((irsp->un.ulpWord[4]) >> 16 != LSRJT_UNABLE_TPC)) ||
                        (phba)->pport->cfg_log_verbose & LOG_ELS)
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "2881 RRQ failure DID:%06X Status:x%x/x%x\n",
                                 ndlp->nlp_DID, irsp->ulpStatus,
                                 irsp->un.ulpWord[4]);
        }
out:
        if (rrq)
                lpfc_clr_rrq_active(phba, rrq->xritag, rrq);
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}
/**
 * lpfc_cmpl_els_plogi - Completion callback function for plogi
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function for issuing the Port
 * Login (PLOGI) command. For PLOGI completion, there must be an active
 * ndlp on the vport node list that matches the remote node ID from the
 * PLOGI response IOCB. If such ndlp does not exist, the PLOGI is simply
 * ignored and command IOCB released. The PLOGI response IOCB status is
 * checked for error conditons. If there is error status reported, PLOGI
 * retry shall be attempted by invoking the lpfc_els_retry() routine.
 * Otherwise, the lpfc_plogi_confirm_nport() routine shall be invoked on
 * the ndlp and the NLP_EVT_CMPL_PLOGI state to the Discover State Machine
 * (DSM) is set for this PLOGI completion. Finally, it checks whether
 * there are additional N_Port nodes with the vport that need to perform
 * PLOGI. If so, the lpfc_more_plogi() routine is invoked to issue addition
 * PLOGIs.
 **/
static void
lpfc_cmpl_els_plogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_nodelist *ndlp;
        struct lpfc_dmabuf *prsp;
        int disc, rc, did, type;

        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &rspiocb->iocb;
        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "PLOGI cmpl:      status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                irsp->un.elsreq64.remoteID);

        ndlp = lpfc_findnode_did(vport, irsp->un.elsreq64.remoteID);
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0136 PLOGI completes to NPort x%x "
                                 "with no ndlp. Data: x%x x%x x%x\n",
                                 irsp->un.elsreq64.remoteID,
                                 irsp->ulpStatus, irsp->un.ulpWord[4],
                                 irsp->ulpIoTag);
                goto out;
        }

        /* Since ndlp can be freed in the disc state machine, note if this node
         * is being used during discovery.
         */
        spin_lock_irq(shost->host_lock);
        disc = (ndlp->nlp_flag & NLP_NPR_2B_DISC);
        ndlp->nlp_flag &= ~NLP_NPR_2B_DISC;
        spin_unlock_irq(shost->host_lock);
        rc   = 0;

        /* PLOGI completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0102 PLOGI completes to NPort x%x "
                         "Data: x%x x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, disc, vport->num_disc_nodes);
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport)) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
                goto out;
        }

        /* ndlp could be freed in DSM, save these values now */
        type = ndlp->nlp_type;
        did = ndlp->nlp_DID;

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb)) {
                        /* ELS command is being retried */
                        if (disc) {
                                spin_lock_irq(shost->host_lock);
                                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                                spin_unlock_irq(shost->host_lock);
                        }
                        goto out;
                }
                /* PLOGI failed Don't print the vport to vport rjts */
                if (irsp->ulpStatus != IOSTAT_LS_RJT ||
                        (((irsp->un.ulpWord[4]) >> 16 != LSRJT_INVALID_CMD) &&
                        ((irsp->un.ulpWord[4]) >> 16 != LSRJT_UNABLE_TPC)) ||
                        (phba)->pport->cfg_log_verbose & LOG_ELS)
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "2753 PLOGI failure DID:%06X Status:x%x/x%x\n",
                                 ndlp->nlp_DID, irsp->ulpStatus,
                                 irsp->un.ulpWord[4]);
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (lpfc_error_lost_link(irsp))
                        rc = NLP_STE_FREED_NODE;
                else
                        rc = lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                     NLP_EVT_CMPL_PLOGI);
        } else {
                /* Good status, call state machine */
                prsp = list_entry(((struct lpfc_dmabuf *)
                                   cmdiocb->context2)->list.next,
                                  struct lpfc_dmabuf, list);
                ndlp = lpfc_plogi_confirm_nport(phba, prsp->virt, ndlp);
                rc = lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                             NLP_EVT_CMPL_PLOGI);
        }

        if (disc && vport->num_disc_nodes) {
                /* Check to see if there are more PLOGIs to be sent */
                lpfc_more_plogi(vport);

                if (vport->num_disc_nodes == 0) {
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag &= ~FC_NDISC_ACTIVE;
                        spin_unlock_irq(shost->host_lock);

                        lpfc_can_disctmo(vport);
                        lpfc_end_rscn(vport);
                }
        }

out:
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_plogi - Issue an plogi iocb command for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 * @did: destination port identifier.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Port Login (PLOGI) command to a remote N_Port
 * (with the @did) for a @vport. Before issuing a PLOGI to a remote N_Port,
 * the ndlp with the remote N_Port DID must exist on the @vport's ndlp list.
 * This routine constructs the proper feilds of the PLOGI IOCB and invokes
 * the lpfc_sli_issue_iocb() routine to send out PLOGI ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the PLOGI ELS command.
 *
 * Return code
 *   0 - Successfully issued a plogi for @vport
 *   1 - failed to issue a plogi for @vport
 **/
int
lpfc_issue_els_plogi(struct lpfc_vport *vport, uint32_t did, uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        struct serv_parm *sp;
        IOCB_t *icmd;
        struct lpfc_nodelist *ndlp;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int ret;

        psli = &phba->sli;

        ndlp = lpfc_findnode_did(vport, did);
        if (ndlp && !NLP_CHK_NODE_ACT(ndlp))
                ndlp = NULL;

        /* If ndlp is not NULL, we will bump the reference count on it */
        cmdsize = (sizeof(uint32_t) + sizeof(struct serv_parm));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp, did,
                                     ELS_CMD_PLOGI);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For PLOGI request, remainder of payload is service parameters */
        *((uint32_t *) (pcmd)) = ELS_CMD_PLOGI;
        pcmd += sizeof(uint32_t);
        memcpy(pcmd, &vport->fc_sparam, sizeof(struct serv_parm));
        sp = (struct serv_parm *) pcmd;

        /*
         * If we are a N-port connected to a Fabric, fix-up paramm's so logins
         * to device on remote loops work.
         */
        if ((vport->fc_flag & FC_FABRIC) && !(vport->fc_flag & FC_PUBLIC_LOOP))
                sp->cmn.altBbCredit = 1;

        if (sp->cmn.fcphLow < FC_PH_4_3)
                sp->cmn.fcphLow = FC_PH_4_3;

        if (sp->cmn.fcphHigh < FC_PH3)
                sp->cmn.fcphHigh = FC_PH3;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue PLOGI:     did:x%x",
                did, 0, 0);

        phba->fc_stat.elsXmitPLOGI++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_plogi;
        ret = lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, elsiocb, 0);

        if (ret == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_cmpl_els_prli - Completion callback function for prli
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function for a Process Login
 * (PRLI) ELS command. The PRLI response IOCB status is checked for error
 * status. If there is error status reported, PRLI retry shall be attempted
 * by invoking the lpfc_els_retry() routine. Otherwise, the state
 * NLP_EVT_CMPL_PRLI is sent to the Discover State Machine (DSM) for this
 * ndlp to mark the PRLI completion.
 **/
static void
lpfc_cmpl_els_prli(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_sli *psli;
        struct lpfc_nodelist *ndlp;

        psli = &phba->sli;
        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &(rspiocb->iocb);
        ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~NLP_PRLI_SND;
        spin_unlock_irq(shost->host_lock);

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "PRLI cmpl:       status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                ndlp->nlp_DID);
        /* PRLI completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0103 PRLI completes to NPort x%x "
                         "Data: x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, vport->num_disc_nodes);

        vport->fc_prli_sent--;
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport))
                goto out;

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb)) {
                        /* ELS command is being retried */
                        goto out;
                }
                /* PRLI failed */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "2754 PRLI failure DID:%06X Status:x%x/x%x\n",
                                 ndlp->nlp_DID, irsp->ulpStatus,
                                 irsp->un.ulpWord[4]);
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (lpfc_error_lost_link(irsp))
                        goto out;
                else
                        lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                NLP_EVT_CMPL_PRLI);
        } else
                /* Good status, call state machine */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_CMPL_PRLI);
out:
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_prli - Issue a prli iocb command for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Process Login (PRLI) ELS command for the
 * @vport. The PRLI service parameters are set up in the payload of the
 * PRLI Request command and the pointer to lpfc_cmpl_els_prli() routine
 * is put to the IOCB completion callback func field before invoking the
 * routine lpfc_sli_issue_iocb() to send out PRLI command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the PRLI ELS command.
 *
 * Return code
 *   0 - successfully issued prli iocb command for @vport
 *   1 - failed to issue prli iocb command for @vport
 **/
int
lpfc_issue_els_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                    uint8_t retry)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba *phba = vport->phba;
        PRLI *npr;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        uint8_t *pcmd;
        uint16_t cmdsize;

        cmdsize = (sizeof(uint32_t) + sizeof(PRLI));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_PRLI);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For PRLI request, remainder of payload is service parameters */
        memset(pcmd, 0, (sizeof(PRLI) + sizeof(uint32_t)));
        *((uint32_t *) (pcmd)) = ELS_CMD_PRLI;
        pcmd += sizeof(uint32_t);

        /* For PRLI, remainder of payload is PRLI parameter page */
        npr = (PRLI *) pcmd;
        /*
         * If our firmware version is 3.20 or later,
         * set the following bits for FC-TAPE support.
         */
        if (phba->vpd.rev.feaLevelHigh >= 0x02) {
                npr->ConfmComplAllowed = 1;
                npr->Retry = 1;
                npr->TaskRetryIdReq = 1;
        }
        npr->estabImagePair = 1;
        npr->readXferRdyDis = 1;

        /* For FCP support */
        npr->prliType = PRLI_FCP_TYPE;
        npr->initiatorFunc = 1;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue PRLI:      did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitPRLI++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_prli;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_PRLI_SND;
        spin_unlock_irq(shost->host_lock);
        if (lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, elsiocb, 0) ==
            IOCB_ERROR) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_PRLI_SND;
                spin_unlock_irq(shost->host_lock);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        vport->fc_prli_sent++;
        return 0;
}

/**
 * lpfc_rscn_disc - Perform rscn discovery for a vport
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine performs Registration State Change Notification (RSCN)
 * discovery for a @vport. If the @vport's node port recovery count is not
 * zero, it will invoke the lpfc_els_disc_plogi() to perform PLOGI for all
 * the nodes that need recovery. If none of the PLOGI were needed through
 * the lpfc_els_disc_plogi() routine, the lpfc_end_rscn() routine shall be
 * invoked to check and handle possible more RSCN came in during the period
 * of processing the current ones.
 **/
static void
lpfc_rscn_disc(struct lpfc_vport *vport)
{
        lpfc_can_disctmo(vport);

        /* RSCN discovery */
        /* go thru NPR nodes and issue ELS PLOGIs */
        if (vport->fc_npr_cnt)
                if (lpfc_els_disc_plogi(vport))
                        return;

        lpfc_end_rscn(vport);
}

/**
 * lpfc_adisc_done - Complete the adisc phase of discovery

 * @vport: pointer to lpfc_vport hba data structure that finished all ADISCs.
 *
 * This function is called when the final ADISC is completed during discovery.
 * This function handles clearing link attention or issuing reg_vpi depending
 * on whether npiv is enabled. This function also kicks off the PLOGI phase of
 * discovery.
 * This function is called with no locks held.
 **/
static void
lpfc_adisc_done(struct lpfc_vport *vport)
{
        struct Scsi_Host   *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba   *phba = vport->phba;

        /*
         * For NPIV, cmpl_reg_vpi will set port_state to READY,
         * and continue discovery.
         */
        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
            !(vport->fc_flag & FC_RSCN_MODE) &&
            (phba->sli_rev < LPFC_SLI_REV4)) {
                lpfc_issue_reg_vpi(phba, vport);
                return;
        }
        /*
        * For SLI2, we need to set port_state to READY
        * and continue discovery.
        */
        if (vport->port_state < LPFC_VPORT_READY) {
                /* If we get here, there is nothing to ADISC */
                if (vport->port_type == LPFC_PHYSICAL_PORT)
                        lpfc_issue_clear_la(phba, vport);
                if (!(vport->fc_flag & FC_ABORT_DISCOVERY)) {
                        vport->num_disc_nodes = 0;
                        /* go thru NPR list, issue ELS PLOGIs */
                        if (vport->fc_npr_cnt)
                                lpfc_els_disc_plogi(vport);
                        if (!vport->num_disc_nodes) {
                                spin_lock_irq(shost->host_lock);
                                vport->fc_flag &= ~FC_NDISC_ACTIVE;
                                spin_unlock_irq(shost->host_lock);
                                lpfc_can_disctmo(vport);
                                lpfc_end_rscn(vport);
                        }
                }
                vport->port_state = LPFC_VPORT_READY;
        } else
                lpfc_rscn_disc(vport);
}

/**
 * lpfc_more_adisc - Issue more adisc as needed
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine determines whether there are more ndlps on a @vport
 * node list need to have Address Discover (ADISC) issued. If so, it will
 * invoke the lpfc_els_disc_adisc() routine to issue ADISC on the @vport's
 * remaining nodes which need to have ADISC sent.
 **/
void
lpfc_more_adisc(struct lpfc_vport *vport)
{
        int sentadisc;

        if (vport->num_disc_nodes)
                vport->num_disc_nodes--;
        /* Continue discovery with <num_disc_nodes> ADISCs to go */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                         "0210 Continue discovery with %d ADISCs to go "
                         "Data: x%x x%x x%x\n",
                         vport->num_disc_nodes, vport->fc_adisc_cnt,
                         vport->fc_flag, vport->port_state);
        /* Check to see if there are more ADISCs to be sent */
        if (vport->fc_flag & FC_NLP_MORE) {
                lpfc_set_disctmo(vport);
                /* go thru NPR nodes and issue any remaining ELS ADISCs */
                sentadisc = lpfc_els_disc_adisc(vport);
        }
        if (!vport->num_disc_nodes)
                lpfc_adisc_done(vport);
        return;
}

/**
 * lpfc_cmpl_els_adisc - Completion callback function for adisc
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion function for issuing the Address Discover
 * (ADISC) command. It first checks to see whether link went down during
 * the discovery process. If so, the node will be marked as node port
 * recovery for issuing discover IOCB by the link attention handler and
 * exit. Otherwise, the response status is checked. If error was reported
 * in the response status, the ADISC command shall be retried by invoking
 * the lpfc_els_retry() routine. Otherwise, if no error was reported in
 * the response status, the state machine is invoked to set transition
 * with respect to NLP_EVT_CMPL_ADISC event.
 **/
static void
lpfc_cmpl_els_adisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_nodelist *ndlp;
        int  disc;

        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &(rspiocb->iocb);
        ndlp = (struct lpfc_nodelist *) cmdiocb->context1;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "ADISC cmpl:      status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                ndlp->nlp_DID);

        /* Since ndlp can be freed in the disc state machine, note if this node
         * is being used during discovery.
         */
        spin_lock_irq(shost->host_lock);
        disc = (ndlp->nlp_flag & NLP_NPR_2B_DISC);
        ndlp->nlp_flag &= ~(NLP_ADISC_SND | NLP_NPR_2B_DISC);
        spin_unlock_irq(shost->host_lock);
        /* ADISC completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0104 ADISC completes to NPort x%x "
                         "Data: x%x x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, disc, vport->num_disc_nodes);
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport)) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
                goto out;
        }

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb)) {
                        /* ELS command is being retried */
                        if (disc) {
                                spin_lock_irq(shost->host_lock);
                                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                                spin_unlock_irq(shost->host_lock);
                                lpfc_set_disctmo(vport);
                        }
                        goto out;
                }
                /* ADISC failed */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "2755 ADISC failure DID:%06X Status:x%x/x%x\n",
                                 ndlp->nlp_DID, irsp->ulpStatus,
                                 irsp->un.ulpWord[4]);
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (!lpfc_error_lost_link(irsp))
                        lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                NLP_EVT_CMPL_ADISC);
        } else
                /* Good status, call state machine */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_CMPL_ADISC);

        /* Check to see if there are more ADISCs to be sent */
        if (disc && vport->num_disc_nodes)
                lpfc_more_adisc(vport);
out:
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_adisc - Issue an address discover iocb to an node on a vport
 * @vport: pointer to a virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues an Address Discover (ADISC) for an @ndlp on a
 * @vport. It prepares the payload of the ADISC ELS command, updates the
 * and states of the ndlp, and invokes the lpfc_sli_issue_iocb() routine
 * to issue the ADISC ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the ADISC ELS command.
 *
 * Return code
 *   0 - successfully issued adisc
 *   1 - failed to issue adisc
 **/
int
lpfc_issue_els_adisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     uint8_t retry)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        ADISC *ap;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        uint8_t *pcmd;
        uint16_t cmdsize;

        cmdsize = (sizeof(uint32_t) + sizeof(ADISC));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_ADISC);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For ADISC request, remainder of payload is service parameters */
        *((uint32_t *) (pcmd)) = ELS_CMD_ADISC;
        pcmd += sizeof(uint32_t);

        /* Fill in ADISC payload */
        ap = (ADISC *) pcmd;
        ap->hardAL_PA = phba->fc_pref_ALPA;
        memcpy(&ap->portName, &vport->fc_portname, sizeof(struct lpfc_name));
        memcpy(&ap->nodeName, &vport->fc_nodename, sizeof(struct lpfc_name));
        ap->DID = be32_to_cpu(vport->fc_myDID);

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue ADISC:     did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitADISC++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_adisc;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_ADISC_SND;
        spin_unlock_irq(shost->host_lock);
        if (lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, elsiocb, 0) ==
            IOCB_ERROR) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_ADISC_SND;
                spin_unlock_irq(shost->host_lock);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_cmpl_els_logo - Completion callback function for logo
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion function for issuing the ELS Logout (LOGO)
 * command. If no error status was reported from the LOGO response, the
 * state machine of the associated ndlp shall be invoked for transition with
 * respect to NLP_EVT_CMPL_LOGO event. Otherwise, if error status was reported,
 * the lpfc_els_retry() routine will be invoked to retry the LOGO command.
 **/
static void
lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_iocbq *rspiocb)
{
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        struct lpfc_vport *vport = ndlp->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_sli *psli;
        struct lpfcMboxq *mbox;

        psli = &phba->sli;
        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &(rspiocb->iocb);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~NLP_LOGO_SND;
        spin_unlock_irq(shost->host_lock);

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "LOGO cmpl:       status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                ndlp->nlp_DID);
        /* LOGO completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0105 LOGO completes to NPort x%x "
                         "Data: x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, vport->num_disc_nodes);
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport))
                goto out;

        if (ndlp->nlp_flag & NLP_TARGET_REMOVE) {
                /* NLP_EVT_DEVICE_RM should unregister the RPI
                 * which should abort all outstanding IOs.
                 */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_DEVICE_RM);
                goto out;
        }

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb))
                        /* ELS command is being retried */
                        goto out;
                /* LOGO failed */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "2756 LOGO failure DID:%06X Status:x%x/x%x\n",
                                 ndlp->nlp_DID, irsp->ulpStatus,
                                 irsp->un.ulpWord[4]);
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (lpfc_error_lost_link(irsp))
                        goto out;
                else
                        lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                NLP_EVT_CMPL_LOGO);
        } else
                /* Good status, call state machine.
                 * This will unregister the rpi if needed.
                 */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_CMPL_LOGO);
out:
        lpfc_els_free_iocb(phba, cmdiocb);
        /* If we are in pt2pt mode, we could rcv new S_ID on PLOGI */
        if ((vport->fc_flag & FC_PT2PT) &&
                !(vport->fc_flag & FC_PT2PT_PLOGI)) {
                phba->pport->fc_myDID = 0;
                mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
                if (mbox) {
                        lpfc_config_link(phba, mbox);
                        mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                        mbox->vport = vport;
                        if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT) ==
                                MBX_NOT_FINISHED) {
                                mempool_free(mbox, phba->mbox_mem_pool);
                        }
                }
        }
        return;
}

/**
 * lpfc_issue_els_logo - Issue a logo to an node on a vport
 * @vport: pointer to a virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine constructs and issues an ELS Logout (LOGO) iocb command
 * to a remote node, referred by an @ndlp on a @vport. It constructs the
 * payload of the IOCB, properly sets up the @ndlp state, and invokes the
 * lpfc_sli_issue_iocb() routine to send out the LOGO ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the LOGO ELS command.
 *
 * Return code
 *   0 - successfully issued logo
 *   1 - failed to issue logo
 **/
int
lpfc_issue_els_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                    uint8_t retry)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int rc;

        spin_lock_irq(shost->host_lock);
        if (ndlp->nlp_flag & NLP_LOGO_SND) {
                spin_unlock_irq(shost->host_lock);
                return 0;
        }
        spin_unlock_irq(shost->host_lock);

        cmdsize = (2 * sizeof(uint32_t)) + sizeof(struct lpfc_name);
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_LOGO);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
        *((uint32_t *) (pcmd)) = ELS_CMD_LOGO;
        pcmd += sizeof(uint32_t);

        /* Fill in LOGO payload */
        *((uint32_t *) (pcmd)) = be32_to_cpu(vport->fc_myDID);
        pcmd += sizeof(uint32_t);
        memcpy(pcmd, &vport->fc_portname, sizeof(struct lpfc_name));

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue LOGO:      did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitLOGO++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_logo;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_LOGO_SND;
        spin_unlock_irq(shost->host_lock);
        rc = lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, elsiocb, 0);

        if (rc == IOCB_ERROR) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_LOGO_SND;
                spin_unlock_irq(shost->host_lock);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_cmpl_els_cmd - Completion callback function for generic els command
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is a generic completion callback function for ELS commands.
 * Specifically, it is the callback function which does not need to perform
 * any command specific operations. It is currently used by the ELS command
 * issuing routines for the ELS State Change  Request (SCR),
 * lpfc_issue_els_scr(), and the ELS Fibre Channel Address Resolution
 * Protocol Response (FARPR) routine, lpfc_issue_els_farpr(). Other than
 * certain debug loggings, this callback function simply invokes the
 * lpfc_els_chk_latt() routine to check whether link went down during the
 * discovery process.
 **/
static void
lpfc_cmpl_els_cmd(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        IOCB_t *irsp;

        irsp = &rspiocb->iocb;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "ELS cmd cmpl:    status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                irsp->un.elsreq64.remoteID);
        /* ELS cmd tag <ulpIoTag> completes */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0106 ELS cmd tag x%x completes Data: x%x x%x x%x\n",
                         irsp->ulpIoTag, irsp->ulpStatus,
                         irsp->un.ulpWord[4], irsp->ulpTimeout);
        /* Check to see if link went down during discovery */
        lpfc_els_chk_latt(vport);
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_scr - Issue a scr to an node on a vport
 * @vport: pointer to a host virtual N_Port data structure.
 * @nportid: N_Port identifier to the remote node.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a State Change Request (SCR) to a fabric node
 * on a @vport. The remote node @nportid is passed into the function. It
 * first search the @vport node list to find the matching ndlp. If no such
 * ndlp is found, a new ndlp shall be created for this (SCR) purpose. An
 * IOCB is allocated, payload prepared, and the lpfc_sli_issue_iocb()
 * routine is invoked to send the SCR IOCB.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the SCR ELS command.
 *
 * Return code
 *   0 - Successfully issued scr command
 *   1 - Failed to issue scr command
 **/
int
lpfc_issue_els_scr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        struct lpfc_nodelist *ndlp;

        psli = &phba->sli;
        cmdsize = (sizeof(uint32_t) + sizeof(SCR));

        ndlp = lpfc_findnode_did(vport, nportid);
        if (!ndlp) {
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 1;
                lpfc_nlp_init(vport, ndlp, nportid);
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 1;
        }

        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_SCR);

        if (!elsiocb) {
                /* This will trigger the release of the node just
                 * allocated
                 */
                lpfc_nlp_put(ndlp);
                return 1;
        }

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        *((uint32_t *) (pcmd)) = ELS_CMD_SCR;
        pcmd += sizeof(uint32_t);

        /* For SCR, remainder of payload is SCR parameter page */
        memset(pcmd, 0, sizeof(SCR));
        ((SCR *) pcmd)->Function = SCR_FUNC_FULL;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue SCR:       did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitSCR++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_cmd;
        if (lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, elsiocb, 0) ==
            IOCB_ERROR) {
                /* The additional lpfc_nlp_put will cause the following
                 * lpfc_els_free_iocb routine to trigger the rlease of
                 * the node.
                 */
                lpfc_nlp_put(ndlp);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        /* This will cause the callback-function lpfc_cmpl_els_cmd to
         * trigger the release of node.
         */
        lpfc_nlp_put(ndlp);
        return 0;
}

/**
 * lpfc_issue_els_farpr - Issue a farp to an node on a vport
 * @vport: pointer to a host virtual N_Port data structure.
 * @nportid: N_Port identifier to the remote node.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Fibre Channel Address Resolution Response
 * (FARPR) to a node on a vport. The remote node N_Port identifier (@nportid)
 * is passed into the function. It first search the @vport node list to find
 * the matching ndlp. If no such ndlp is found, a new ndlp shall be created
 * for this (FARPR) purpose. An IOCB is allocated, payload prepared, and the
 * lpfc_sli_issue_iocb() routine is invoked to send the FARPR ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the PARPR ELS command.
 *
 * Return code
 *   0 - Successfully issued farpr command
 *   1 - Failed to issue farpr command
 **/
static int
lpfc_issue_els_farpr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli *psli;
        FARP *fp;
        uint8_t *pcmd;
        uint32_t *lp;
        uint16_t cmdsize;
        struct lpfc_nodelist *ondlp;
        struct lpfc_nodelist *ndlp;

        psli = &phba->sli;
        cmdsize = (sizeof(uint32_t) + sizeof(FARP));

        ndlp = lpfc_findnode_did(vport, nportid);
        if (!ndlp) {
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 1;
                lpfc_nlp_init(vport, ndlp, nportid);
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 1;
        }

        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_RNID);
        if (!elsiocb) {
                /* This will trigger the release of the node just
                 * allocated
                 */
                lpfc_nlp_put(ndlp);
                return 1;
        }

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        *((uint32_t *) (pcmd)) = ELS_CMD_FARPR;
        pcmd += sizeof(uint32_t);

        /* Fill in FARPR payload */
        fp = (FARP *) (pcmd);
        memset(fp, 0, sizeof(FARP));
        lp = (uint32_t *) pcmd;
        *lp++ = be32_to_cpu(nportid);
        *lp++ = be32_to_cpu(vport->fc_myDID);
        fp->Rflags = 0;
        fp->Mflags = (FARP_MATCH_PORT | FARP_MATCH_NODE);

        memcpy(&fp->RportName, &vport->fc_portname, sizeof(struct lpfc_name));
        memcpy(&fp->RnodeName, &vport->fc_nodename, sizeof(struct lpfc_name));
        ondlp = lpfc_findnode_did(vport, nportid);
        if (ondlp && NLP_CHK_NODE_ACT(ondlp)) {
                memcpy(&fp->OportName, &ondlp->nlp_portname,
                       sizeof(struct lpfc_name));
                memcpy(&fp->OnodeName, &ondlp->nlp_nodename,
                       sizeof(struct lpfc_name));
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue FARPR:     did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitFARPR++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_cmd;
        if (lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, elsiocb, 0) ==
            IOCB_ERROR) {
                /* The additional lpfc_nlp_put will cause the following
                 * lpfc_els_free_iocb routine to trigger the release of
                 * the node.
                 */
                lpfc_nlp_put(ndlp);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        /* This will cause the callback-function lpfc_cmpl_els_cmd to
         * trigger the release of the node.
         */
        lpfc_nlp_put(ndlp);
        return 0;
}

/**
 * lpfc_cancel_retry_delay_tmo - Cancel the timer with delayed iocb-cmd retry
 * @vport: pointer to a host virtual N_Port data structure.
 * @nlp: pointer to a node-list data structure.
 *
 * This routine cancels the timer with a delayed IOCB-command retry for
 * a @vport's @ndlp. It stops the timer for the delayed function retrial and
 * removes the ELS retry event if it presents. In addition, if the
 * NLP_NPR_2B_DISC bit is set in the @nlp's nlp_flag bitmap, ADISC IOCB
 * commands are sent for the @vport's nodes that require issuing discovery
 * ADISC.
 **/
void
lpfc_cancel_retry_delay_tmo(struct lpfc_vport *vport, struct lpfc_nodelist *nlp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_work_evt *evtp;

        if (!(nlp->nlp_flag & NLP_DELAY_TMO))
                return;
        spin_lock_irq(shost->host_lock);
        nlp->nlp_flag &= ~NLP_DELAY_TMO;
        spin_unlock_irq(shost->host_lock);
        del_timer_sync(&nlp->nlp_delayfunc);
        nlp->nlp_last_elscmd = 0;
        if (!list_empty(&nlp->els_retry_evt.evt_listp)) {
                list_del_init(&nlp->els_retry_evt.evt_listp);
                /* Decrement nlp reference count held for the delayed retry */
                evtp = &nlp->els_retry_evt;
                lpfc_nlp_put((struct lpfc_nodelist *)evtp->evt_arg1);
        }
        if (nlp->nlp_flag & NLP_NPR_2B_DISC) {
                spin_lock_irq(shost->host_lock);
                nlp->nlp_flag &= ~NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
                if (vport->num_disc_nodes) {
                        if (vport->port_state < LPFC_VPORT_READY) {
                                /* Check if there are more ADISCs to be sent */
                                lpfc_more_adisc(vport);
                        } else {
                                /* Check if there are more PLOGIs to be sent */
                                lpfc_more_plogi(vport);
                                if (vport->num_disc_nodes == 0) {
                                        spin_lock_irq(shost->host_lock);
                                        vport->fc_flag &= ~FC_NDISC_ACTIVE;
                                        spin_unlock_irq(shost->host_lock);
                                        lpfc_can_disctmo(vport);
                                        lpfc_end_rscn(vport);
                                }
                        }
                }
        }
        return;
}

/**
 * lpfc_els_retry_delay - Timer function with a ndlp delayed function timer
 * @ptr: holder for the pointer to the timer function associated data (ndlp).
 *
 * This routine is invoked by the ndlp delayed-function timer to check
 * whether there is any pending ELS retry event(s) with the node. If not, it
 * simply returns. Otherwise, if there is at least one ELS delayed event, it
 * adds the delayed events to the HBA work list and invokes the
 * lpfc_worker_wake_up() routine to wake up worker thread to process the
 * event. Note that lpfc_nlp_get() is called before posting the event to
 * the work list to hold reference count of ndlp so that it guarantees the
 * reference to ndlp will still be available when the worker thread gets
 * to the event associated with the ndlp.
 **/
void
lpfc_els_retry_delay(unsigned long ptr)
{
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) ptr;
        struct lpfc_vport *vport = ndlp->vport;
        struct lpfc_hba   *phba = vport->phba;
        unsigned long flags;
        struct lpfc_work_evt  *evtp = &ndlp->els_retry_evt;

        spin_lock_irqsave(&phba->hbalock, flags);
        if (!list_empty(&evtp->evt_listp)) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                return;
        }

        /* We need to hold the node by incrementing the reference
         * count until the queued work is done
         */
        evtp->evt_arg1  = lpfc_nlp_get(ndlp);
        if (evtp->evt_arg1) {
                evtp->evt = LPFC_EVT_ELS_RETRY;
                list_add_tail(&evtp->evt_listp, &phba->work_list);
                lpfc_worker_wake_up(phba);
        }
        spin_unlock_irqrestore(&phba->hbalock, flags);
        return;
}

/**
 * lpfc_els_retry_delay_handler - Work thread handler for ndlp delayed function
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine is the worker-thread handler for processing the @ndlp delayed
 * event(s), posted by the lpfc_els_retry_delay() routine. It simply retrieves
 * the last ELS command from the associated ndlp and invokes the proper ELS
 * function according to the delayed ELS command to retry the command.
 **/
void
lpfc_els_retry_delay_handler(struct lpfc_nodelist *ndlp)
{
        struct lpfc_vport *vport = ndlp->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        uint32_t cmd, did, retry;

        spin_lock_irq(shost->host_lock);
        did = ndlp->nlp_DID;
        cmd = ndlp->nlp_last_elscmd;
        ndlp->nlp_last_elscmd = 0;

        if (!(ndlp->nlp_flag & NLP_DELAY_TMO)) {
                spin_unlock_irq(shost->host_lock);
                return;
        }

        ndlp->nlp_flag &= ~NLP_DELAY_TMO;
        spin_unlock_irq(shost->host_lock);
        /*
         * If a discovery event readded nlp_delayfunc after timer
         * firing and before processing the timer, cancel the
         * nlp_delayfunc.
         */
        del_timer_sync(&ndlp->nlp_delayfunc);
        retry = ndlp->nlp_retry;
        ndlp->nlp_retry = 0;

        switch (cmd) {
        case ELS_CMD_FLOGI:
                lpfc_issue_els_flogi(vport, ndlp, retry);
                break;
        case ELS_CMD_PLOGI:
                if (!lpfc_issue_els_plogi(vport, ndlp->nlp_DID, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
                }
                break;
        case ELS_CMD_ADISC:
                if (!lpfc_issue_els_adisc(vport, ndlp, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_ADISC_ISSUE);
                }
                break;
        case ELS_CMD_PRLI:
                if (!lpfc_issue_els_prli(vport, ndlp, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PRLI_ISSUE);
                }
                break;
        case ELS_CMD_LOGO:
                if (!lpfc_issue_els_logo(vport, ndlp, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                }
                break;
        case ELS_CMD_FDISC:
                if (!(vport->fc_flag & FC_VPORT_NEEDS_INIT_VPI))
                        lpfc_issue_els_fdisc(vport, ndlp, retry);
                break;
        }
        return;
}

/**
 * lpfc_els_retry - Make retry decision on an els command iocb
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine makes a retry decision on an ELS command IOCB, which has
 * failed. The following ELS IOCBs use this function for retrying the command
 * when previously issued command responsed with error status: FLOGI, PLOGI,
 * PRLI, ADISC, LOGO, and FDISC. Based on the ELS command type and the
 * returned error status, it makes the decision whether a retry shall be
 * issued for the command, and whether a retry shall be made immediately or
 * delayed. In the former case, the corresponding ELS command issuing-function
 * is called to retry the command. In the later case, the ELS command shall
 * be posted to the ndlp delayed event and delayed function timer set to the
 * ndlp for the delayed command issusing.
 *
 * Return code
 *   0 - No retry of els command is made
 *   1 - Immediate or delayed retry of els command is made
 **/
static int
lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
               struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp = &rspiocb->iocb;
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        struct lpfc_dmabuf *pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        uint32_t *elscmd;
        struct ls_rjt stat;
        int retry = 0, maxretry = lpfc_max_els_tries, delay = 0;
        int logerr = 0;
        uint32_t cmd = 0;
        uint32_t did;


        /* Note: context2 may be 0 for internal driver abort
         * of delays ELS command.
         */

        if (pcmd && pcmd->virt) {
                elscmd = (uint32_t *) (pcmd->virt);
                cmd = *elscmd++;
        }

        if (ndlp && NLP_CHK_NODE_ACT(ndlp))
                did = ndlp->nlp_DID;
        else {
                /* We should only hit this case for retrying PLOGI */
                did = irsp->un.elsreq64.remoteID;
                ndlp = lpfc_findnode_did(vport, did);
                if ((!ndlp || !NLP_CHK_NODE_ACT(ndlp))
                    && (cmd != ELS_CMD_PLOGI))
                        return 1;
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Retry ELS:       wd7:x%x wd4:x%x did:x%x",
                *(((uint32_t *) irsp) + 7), irsp->un.ulpWord[4], ndlp->nlp_DID);

        switch (irsp->ulpStatus) {
        case IOSTAT_FCP_RSP_ERROR:
                break;
        case IOSTAT_REMOTE_STOP:
                if (phba->sli_rev == LPFC_SLI_REV4) {
                        /* This IO was aborted by the target, we don't
                         * know the rxid and because we did not send the
                         * ABTS we cannot generate and RRQ.
                         */
                        lpfc_set_rrq_active(phba, ndlp,
                                         cmdiocb->sli4_xritag, 0, 0);
                }
                break;
        case IOSTAT_LOCAL_REJECT:
                switch ((irsp->un.ulpWord[4] & 0xff)) {
                case IOERR_LOOP_OPEN_FAILURE:
                        if (cmd == ELS_CMD_FLOGI) {
                                if (PCI_DEVICE_ID_HORNET ==
                                        phba->pcidev->device) {
                                        phba->fc_topology = LPFC_TOPOLOGY_LOOP;
                                        phba->pport->fc_myDID = 0;
                                        phba->alpa_map[0] = 0;
                                        phba->alpa_map[1] = 0;
                                }
                        }
                        if (cmd == ELS_CMD_PLOGI && cmdiocb->retry == 0)
                                delay = 1000;
                        retry = 1;
                        break;

                case IOERR_ILLEGAL_COMMAND:
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                         "0124 Retry illegal cmd x%x "
                                         "retry:x%x delay:x%x\n",
                                         cmd, cmdiocb->retry, delay);
                        retry = 1;
                        /* All command's retry policy */
                        maxretry = 8;
                        if (cmdiocb->retry > 2)
                                delay = 1000;
                        break;

                case IOERR_NO_RESOURCES:
                        logerr = 1; /* HBA out of resources */
                        retry = 1;
                        if (cmdiocb->retry > 100)
                                delay = 100;
                        maxretry = 250;
                        break;

                case IOERR_ILLEGAL_FRAME:
                        delay = 100;
                        retry = 1;
                        break;

                case IOERR_SEQUENCE_TIMEOUT:
                case IOERR_INVALID_RPI:
                        retry = 1;
                        break;
                }
                break;

        case IOSTAT_NPORT_RJT:
        case IOSTAT_FABRIC_RJT:
                if (irsp->un.ulpWord[4] & RJT_UNAVAIL_TEMP) {
                        retry = 1;
                        break;
                }
                break;

        case IOSTAT_NPORT_BSY:
        case IOSTAT_FABRIC_BSY:
                logerr = 1; /* Fabric / Remote NPort out of resources */
                retry = 1;
                break;

        case IOSTAT_LS_RJT:
                stat.un.lsRjtError = be32_to_cpu(irsp->un.ulpWord[4]);
                /* Added for Vendor specifc support
                 * Just keep retrying for these Rsn / Exp codes
                 */
                switch (stat.un.b.lsRjtRsnCode) {
                case LSRJT_UNABLE_TPC:
                        if (stat.un.b.lsRjtRsnCodeExp ==
                            LSEXP_CMD_IN_PROGRESS) {
                                if (cmd == ELS_CMD_PLOGI) {
                                        delay = 1000;
                                        maxretry = 48;
                                }
                                retry = 1;
                                break;
                        }
                        if (stat.un.b.lsRjtRsnCodeExp ==
                            LSEXP_CANT_GIVE_DATA) {
                                if (cmd == ELS_CMD_PLOGI) {
                                        delay = 1000;
                                        maxretry = 48;
                                }
                                retry = 1;
                                break;
                        }
                        if (cmd == ELS_CMD_PLOGI) {
                                delay = 1000;
                                maxretry = lpfc_max_els_tries + 1;
                                retry = 1;