/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2017-2019 Broadcom. All Rights Reserved. The term *
 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.     *
 * Copyright (C) 2004-2016 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.broadcom.com                                                *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#include <linux/blkdev.h>
#include <linux/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 <scsi/fc/fc_fs.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.h"
#include "lpfc_scsi.h"
#include "lpfc_nvme.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_vport.h"
#include "lpfc_debugfs.h"


/* Called to verify a rcv'ed ADISC was intended for us. */
static int
lpfc_check_adisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                 struct lpfc_name *nn, struct lpfc_name *pn)
{
        /* First, we MUST have a RPI registered */
        if (!(ndlp->nlp_flag & NLP_RPI_REGISTERED))
                return 0;

        /* Compare the ADISC rsp WWNN / WWPN matches our internal node
         * table entry for that node.
         */
        if (memcmp(nn, &ndlp->nlp_nodename, sizeof (struct lpfc_name)))
                return 0;

        if (memcmp(pn, &ndlp->nlp_portname, sizeof (struct lpfc_name)))
                return 0;

        /* we match, return success */
        return 1;
}

int
lpfc_check_sparm(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                 struct serv_parm *sp, uint32_t class, int flogi)
{
        volatile struct serv_parm *hsp = &vport->fc_sparam;
        uint16_t hsp_value, ssp_value = 0;

        /*
         * The receive data field size and buffer-to-buffer receive data field
         * size entries are 16 bits but are represented as two 8-bit fields in
         * the driver data structure to account for rsvd bits and other control
         * bits.  Reconstruct and compare the fields as a 16-bit values before
         * correcting the byte values.
         */
        if (sp->cls1.classValid) {
                if (!flogi) {
                        hsp_value = ((hsp->cls1.rcvDataSizeMsb << 8) |
                                     hsp->cls1.rcvDataSizeLsb);
                        ssp_value = ((sp->cls1.rcvDataSizeMsb << 8) |
                                     sp->cls1.rcvDataSizeLsb);
                        if (!ssp_value)
                                goto bad_service_param;
                        if (ssp_value > hsp_value) {
                                sp->cls1.rcvDataSizeLsb =
                                        hsp->cls1.rcvDataSizeLsb;
                                sp->cls1.rcvDataSizeMsb =
                                        hsp->cls1.rcvDataSizeMsb;
                        }
                }
        } else if (class == CLASS1)
                goto bad_service_param;
        if (sp->cls2.classValid) {
                if (!flogi) {
                        hsp_value = ((hsp->cls2.rcvDataSizeMsb << 8) |
                                     hsp->cls2.rcvDataSizeLsb);
                        ssp_value = ((sp->cls2.rcvDataSizeMsb << 8) |
                                     sp->cls2.rcvDataSizeLsb);
                        if (!ssp_value)
                                goto bad_service_param;
                        if (ssp_value > hsp_value) {
                                sp->cls2.rcvDataSizeLsb =
                                        hsp->cls2.rcvDataSizeLsb;
                                sp->cls2.rcvDataSizeMsb =
                                        hsp->cls2.rcvDataSizeMsb;
                        }
                }
        } else if (class == CLASS2)
                goto bad_service_param;
        if (sp->cls3.classValid) {
                if (!flogi) {
                        hsp_value = ((hsp->cls3.rcvDataSizeMsb << 8) |
                                     hsp->cls3.rcvDataSizeLsb);
                        ssp_value = ((sp->cls3.rcvDataSizeMsb << 8) |
                                     sp->cls3.rcvDataSizeLsb);
                        if (!ssp_value)
                                goto bad_service_param;
                        if (ssp_value > hsp_value) {
                                sp->cls3.rcvDataSizeLsb =
                                        hsp->cls3.rcvDataSizeLsb;
                                sp->cls3.rcvDataSizeMsb =
                                        hsp->cls3.rcvDataSizeMsb;
                        }
                }
        } else if (class == CLASS3)
                goto bad_service_param;

        /*
         * Preserve the upper four bits of the MSB from the PLOGI response.
         * These bits contain the Buffer-to-Buffer State Change Number
         * from the target and need to be passed to the FW.
         */
        hsp_value = (hsp->cmn.bbRcvSizeMsb << 8) | hsp->cmn.bbRcvSizeLsb;
        ssp_value = (sp->cmn.bbRcvSizeMsb << 8) | sp->cmn.bbRcvSizeLsb;
        if (ssp_value > hsp_value) {
                sp->cmn.bbRcvSizeLsb = hsp->cmn.bbRcvSizeLsb;
                sp->cmn.bbRcvSizeMsb = (sp->cmn.bbRcvSizeMsb & 0xF0) |
                                       (hsp->cmn.bbRcvSizeMsb & 0x0F);
        }

        memcpy(&ndlp->nlp_nodename, &sp->nodeName, sizeof (struct lpfc_name));
        memcpy(&ndlp->nlp_portname, &sp->portName, sizeof (struct lpfc_name));
        return 1;
bad_service_param:
        lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                         "0207 Device %x "
                         "(%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x) sent "
                         "invalid service parameters.  Ignoring device.\n",
                         ndlp->nlp_DID,
                         sp->nodeName.u.wwn[0], sp->nodeName.u.wwn[1],
                         sp->nodeName.u.wwn[2], sp->nodeName.u.wwn[3],
                         sp->nodeName.u.wwn[4], sp->nodeName.u.wwn[5],
                         sp->nodeName.u.wwn[6], sp->nodeName.u.wwn[7]);
        return 0;
}

static void *
lpfc_check_elscmpl_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                        struct lpfc_iocbq *rspiocb)
{
        struct lpfc_dmabuf *pcmd, *prsp;
        uint32_t *lp;
        void     *ptr = NULL;
        IOCB_t   *irsp;

        irsp = &rspiocb->iocb;
        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;

        /* For lpfc_els_abort, context2 could be zero'ed to delay
         * freeing associated memory till after ABTS completes.
         */
        if (pcmd) {
                prsp =  list_get_first(&pcmd->list, struct lpfc_dmabuf,
                                       list);
                if (prsp) {
                        lp = (uint32_t *) prsp->virt;
                        ptr = (void *)((uint8_t *)lp + sizeof(uint32_t));
                }
        } else {
                /* Force ulpStatus error since we are returning NULL ptr */
                if (!(irsp->ulpStatus)) {
                        irsp->ulpStatus = IOSTAT_LOCAL_REJECT;
                        irsp->un.ulpWord[4] = IOERR_SLI_ABORTED;
                }
                ptr = NULL;
        }
        return ptr;
}



/*
 * Free resources / clean up outstanding I/Os
 * associated with a LPFC_NODELIST entry. This
 * routine effectively results in a "software abort".
 */
void
lpfc_els_abort(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp)
{
        LIST_HEAD(abort_list);
        struct lpfc_sli_ring *pring;
        struct lpfc_iocbq *iocb, *next_iocb;

        pring = lpfc_phba_elsring(phba);

        /* In case of error recovery path, we might have a NULL pring here */
        if (unlikely(!pring))
                return;

        /* Abort outstanding I/O on NPort <nlp_DID> */
        lpfc_printf_vlog(ndlp->vport, KERN_INFO, LOG_DISCOVERY,
                         "2819 Abort outstanding I/O on NPort x%x "
                         "Data: x%x x%x x%x\n",
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);
        /* Clean up all fabric IOs first.*/
        lpfc_fabric_abort_nport(ndlp);

        /*
         * Lock the ELS ring txcmplq for SLI3/SLI4 and build a local list
         * of all ELS IOs that need an ABTS.  The IOs need to stay on the
         * txcmplq so that the abort operation completes them successfully.
         */
        spin_lock_irq(&phba->hbalock);
        if (phba->sli_rev == LPFC_SLI_REV4)
                spin_lock(&pring->ring_lock);
        list_for_each_entry_safe(iocb, next_iocb, &pring->txcmplq, list) {
        /* Add to abort_list on on NDLP match. */
                if (lpfc_check_sli_ndlp(phba, pring, iocb, ndlp))
                        list_add_tail(&iocb->dlist, &abort_list);
        }
        if (phba->sli_rev == LPFC_SLI_REV4)
                spin_unlock(&pring->ring_lock);
        spin_unlock_irq(&phba->hbalock);

        /* Abort the targeted IOs and remove them from the abort list. */
        list_for_each_entry_safe(iocb, next_iocb, &abort_list, dlist) {
                        spin_lock_irq(&phba->hbalock);
                        list_del_init(&iocb->dlist);
                        lpfc_sli_issue_abort_iotag(phba, pring, iocb);
                        spin_unlock_irq(&phba->hbalock);
        }

        INIT_LIST_HEAD(&abort_list);

        /* Now process the txq */
        spin_lock_irq(&phba->hbalock);
        if (phba->sli_rev == LPFC_SLI_REV4)
                spin_lock(&pring->ring_lock);

        list_for_each_entry_safe(iocb, next_iocb, &pring->txq, list) {
                /* Check to see if iocb matches the nport we are looking for */
                if (lpfc_check_sli_ndlp(phba, pring, iocb, ndlp)) {
                        list_del_init(&iocb->list);
                        list_add_tail(&iocb->list, &abort_list);
                }
        }

        if (phba->sli_rev == LPFC_SLI_REV4)
                spin_unlock(&pring->ring_lock);
        spin_unlock_irq(&phba->hbalock);

        /* Cancel all the IOCBs from the completions list */
        lpfc_sli_cancel_iocbs(phba, &abort_list,
                              IOSTAT_LOCAL_REJECT, IOERR_SLI_ABORTED);

        lpfc_cancel_retry_delay_tmo(phba->pport, ndlp);
}

/* lpfc_defer_pt2pt_acc - Complete SLI3 pt2pt processing on link up
 * @phba: pointer to lpfc hba data structure.
 * @link_mbox: pointer to CONFIG_LINK mailbox object
 *
 * This routine is only called if we are SLI3, direct connect pt2pt
 * mode and the remote NPort issues the PLOGI after link up.
 */
static void
lpfc_defer_pt2pt_acc(struct lpfc_hba *phba, LPFC_MBOXQ_t *link_mbox)
{
        LPFC_MBOXQ_t *login_mbox;
        MAILBOX_t *mb = &link_mbox->u.mb;
        struct lpfc_iocbq *save_iocb;
        struct lpfc_nodelist *ndlp;
        int rc;

        ndlp = link_mbox->ctx_ndlp;
        login_mbox = link_mbox->context3;
        save_iocb = login_mbox->context3;
        link_mbox->context3 = NULL;
        login_mbox->context3 = NULL;

        /* Check for CONFIG_LINK error */
        if (mb->mbxStatus) {
                lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
                                "4575 CONFIG_LINK fails pt2pt discovery: %x\n",
                                mb->mbxStatus);
                mempool_free(login_mbox, phba->mbox_mem_pool);
                mempool_free(link_mbox, phba->mbox_mem_pool);
                kfree(save_iocb);
                return;
        }

        /* Now that CONFIG_LINK completed, and our SID is configured,
         * we can now proceed with sending the PLOGI ACC.
         */
        rc = lpfc_els_rsp_acc(link_mbox->vport, ELS_CMD_PLOGI,
                              save_iocb, ndlp, login_mbox);
        if (rc) {
                lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
                                "4576 PLOGI ACC fails pt2pt discovery: %x\n",
                                rc);
                mempool_free(login_mbox, phba->mbox_mem_pool);
        }

        mempool_free(link_mbox, phba->mbox_mem_pool);
        kfree(save_iocb);
}

/**
 * lpfc_defer_tgt_acc - Progress SLI4 target rcv PLOGI handler
 * @phba: Pointer to HBA context object.
 * @pmb: Pointer to mailbox object.
 *
 * This function provides the unreg rpi mailbox completion handler for a tgt.
 * The routine frees the memory resources associated with the completed
 * mailbox command and transmits the ELS ACC.
 *
 * This routine is only called if we are SLI4, acting in target
 * mode and the remote NPort issues the PLOGI after link up.
 **/
static void
lpfc_defer_acc_rsp(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
{
        struct lpfc_vport *vport = pmb->vport;
        struct lpfc_nodelist *ndlp = pmb->ctx_ndlp;
        LPFC_MBOXQ_t *mbox = pmb->context3;
        struct lpfc_iocbq *piocb = NULL;
        int rc;

        if (mbox) {
                pmb->context3 = NULL;
                piocb = mbox->context3;
                mbox->context3 = NULL;
        }

        /*
         * Complete the unreg rpi mbx request, and update flags.
         * This will also restart any deferred events.
         */
        lpfc_nlp_get(ndlp);
        lpfc_sli4_unreg_rpi_cmpl_clr(phba, pmb);

        if (!piocb) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "4578 PLOGI ACC fail\n");
                if (mbox)
                        mempool_free(mbox, phba->mbox_mem_pool);
                goto out;
        }

        rc = lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, piocb, ndlp, mbox);
        if (rc) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "4579 PLOGI ACC fail %x\n", rc);
                if (mbox)
                        mempool_free(mbox, phba->mbox_mem_pool);
        }
        kfree(piocb);
out:
        lpfc_nlp_put(ndlp);
}

static int
lpfc_rcv_plogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
               struct lpfc_iocbq *cmdiocb)
{
        struct Scsi_Host   *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba    *phba = vport->phba;
        struct lpfc_dmabuf *pcmd;
        uint64_t nlp_portwwn = 0;
        uint32_t *lp;
        IOCB_t *icmd;
        struct serv_parm *sp;
        uint32_t ed_tov;
        LPFC_MBOXQ_t *link_mbox;
        LPFC_MBOXQ_t *login_mbox;
        struct lpfc_iocbq *save_iocb;
        struct ls_rjt stat;
        uint32_t vid, flag;
        u16 rpi;
        int rc, defer_acc;

        memset(&stat, 0, sizeof (struct ls_rjt));
        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;
        sp = (struct serv_parm *) ((uint8_t *) lp + sizeof (uint32_t));
        if (wwn_to_u64(sp->portName.u.wwn) == 0) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0140 PLOGI Reject: invalid nname\n");
                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_INVALID_PNAME;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                        NULL);
                return 0;
        }
        if (wwn_to_u64(sp->nodeName.u.wwn) == 0) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0141 PLOGI Reject: invalid pname\n");
                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_INVALID_NNAME;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                        NULL);
                return 0;
        }

        nlp_portwwn = wwn_to_u64(ndlp->nlp_portname.u.wwn);
        if ((lpfc_check_sparm(vport, ndlp, sp, CLASS3, 0) == 0)) {
                /* Reject this request because invalid parameters */
                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_SPARM_OPTIONS;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                        NULL);
                return 0;
        }
        icmd = &cmdiocb->iocb;

        /* PLOGI chkparm OK */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0114 PLOGI chkparm OK Data: x%x x%x x%x "
                         "x%x x%x x%x\n",
                         ndlp->nlp_DID, ndlp->nlp_state, ndlp->nlp_flag,
                         ndlp->nlp_rpi, vport->port_state,
                         vport->fc_flag);

        if (vport->cfg_fcp_class == 2 && sp->cls2.classValid)
                ndlp->nlp_fcp_info |= CLASS2;
        else
                ndlp->nlp_fcp_info |= CLASS3;

        defer_acc = 0;
        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;
        /* if already logged in, do implicit logout */
        switch (ndlp->nlp_state) {
        case  NLP_STE_NPR_NODE:
                if (!(ndlp->nlp_flag & NLP_NPR_ADISC))
                        break;
                fallthrough;
        case  NLP_STE_REG_LOGIN_ISSUE:
        case  NLP_STE_PRLI_ISSUE:
        case  NLP_STE_UNMAPPED_NODE:
        case  NLP_STE_MAPPED_NODE:
                /* For initiators, lpfc_plogi_confirm_nport skips fabric did.
                 * For target mode, execute implicit logo.
                 * Fabric nodes go into NPR.
                 */
                if (!(ndlp->nlp_type & NLP_FABRIC) &&
                    !(phba->nvmet_support)) {
                        lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, cmdiocb,
                                         ndlp, NULL);
                        return 1;
                }
                if (nlp_portwwn != 0 &&
                    nlp_portwwn != wwn_to_u64(sp->portName.u.wwn))
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                         "0143 PLOGI recv'd from DID: x%x "
                                         "WWPN changed: old %llx new %llx\n",
                                         ndlp->nlp_DID,
                                         (unsigned long long)nlp_portwwn,
                                         (unsigned long long)
                                         wwn_to_u64(sp->portName.u.wwn));

                /* Notify transport of connectivity loss to trigger cleanup. */
                if (phba->nvmet_support &&
                    ndlp->nlp_state == NLP_STE_UNMAPPED_NODE)
                        lpfc_nvmet_invalidate_host(phba, ndlp);

                ndlp->nlp_prev_state = ndlp->nlp_state;
                /* rport needs to be unregistered first */
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                break;
        }

        ndlp->nlp_type &= ~(NLP_FCP_TARGET | NLP_FCP_INITIATOR);
        ndlp->nlp_type &= ~(NLP_NVME_TARGET | NLP_NVME_INITIATOR);
        ndlp->nlp_fcp_info &= ~NLP_FCP_2_DEVICE;
        ndlp->nlp_flag &= ~NLP_FIRSTBURST;

        login_mbox = NULL;
        link_mbox = NULL;
        save_iocb = NULL;

        /* Check for Nport to NPort pt2pt protocol */
        if ((vport->fc_flag & FC_PT2PT) &&
            !(vport->fc_flag & FC_PT2PT_PLOGI)) {
                /* rcv'ed PLOGI decides what our NPortId will be */
                vport->fc_myDID = icmd->un.rcvels.parmRo;

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

                /*
                 * For pt-to-pt, use the larger EDTOV
                 * RATOV = 2 * EDTOV
                 */
                if (ed_tov > phba->fc_edtov)
                        phba->fc_edtov = ed_tov;
                phba->fc_ratov = (2 * phba->fc_edtov) / 1000;

                memcpy(&phba->fc_fabparam, sp, sizeof(struct serv_parm));

                /* Issue config_link / reg_vfi to account for updated TOV's */

                if (phba->sli_rev == LPFC_SLI_REV4)
                        lpfc_issue_reg_vfi(vport);
                else {
                        defer_acc = 1;
                        link_mbox = mempool_alloc(phba->mbox_mem_pool,
                                                  GFP_KERNEL);
                        if (!link_mbox)
                                goto out;
                        lpfc_config_link(phba, link_mbox);
                        link_mbox->mbox_cmpl = lpfc_defer_pt2pt_acc;
                        link_mbox->vport = vport;
                        link_mbox->ctx_ndlp = ndlp;

                        save_iocb = kzalloc(sizeof(*save_iocb), GFP_KERNEL);
                        if (!save_iocb)
                                goto out;
                        /* Save info from cmd IOCB used in rsp */
                        memcpy((uint8_t *)save_iocb, (uint8_t *)cmdiocb,
                               sizeof(struct lpfc_iocbq));
                }

                lpfc_can_disctmo(vport);
        }

        ndlp->nlp_flag &= ~NLP_SUPPRESS_RSP;
        if ((phba->sli.sli_flag & LPFC_SLI_SUPPRESS_RSP) &&
            sp->cmn.valid_vendor_ver_level) {
                vid = be32_to_cpu(sp->un.vv.vid);
                flag = be32_to_cpu(sp->un.vv.flags);
                if ((vid == LPFC_VV_EMLX_ID) && (flag & LPFC_VV_SUPPRESS_RSP))
                        ndlp->nlp_flag |= NLP_SUPPRESS_RSP;
        }

        login_mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!login_mbox)
                goto out;

        /* Registering an existing RPI behaves differently for SLI3 vs SLI4 */
        if (phba->nvmet_support && !defer_acc) {
                link_mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
                if (!link_mbox)
                        goto out;

                /* As unique identifiers such as iotag would be overwritten
                 * with those from the cmdiocb, allocate separate temporary
                 * storage for the copy.
                 */
                save_iocb = kzalloc(sizeof(*save_iocb), GFP_KERNEL);
                if (!save_iocb)
                        goto out;

                /* Unreg RPI is required for SLI4. */
                rpi = phba->sli4_hba.rpi_ids[ndlp->nlp_rpi];
                lpfc_unreg_login(phba, vport->vpi, rpi, link_mbox);
                link_mbox->vport = vport;
                link_mbox->ctx_ndlp = ndlp;
                link_mbox->mbox_cmpl = lpfc_defer_acc_rsp;

                if (((ndlp->nlp_DID & Fabric_DID_MASK) != Fabric_DID_MASK) &&
                    (!(vport->fc_flag & FC_OFFLINE_MODE)))
                        ndlp->nlp_flag |= NLP_UNREG_INP;

                /* Save info from cmd IOCB used in rsp */
                memcpy(save_iocb, cmdiocb, sizeof(*save_iocb));

                /* Delay sending ACC till unreg RPI completes. */
                defer_acc = 1;
        } else if (phba->sli_rev == LPFC_SLI_REV4)
                lpfc_unreg_rpi(vport, ndlp);

        rc = lpfc_reg_rpi(phba, vport->vpi, icmd->un.rcvels.remoteID,
                            (uint8_t *)sp, login_mbox, ndlp->nlp_rpi);
        if (rc)
                goto out;

        /* ACC PLOGI rsp command needs to execute first,
         * queue this login_mbox command to be processed later.
         */
        login_mbox->mbox_cmpl = lpfc_mbx_cmpl_reg_login;
        /*
         * login_mbox->ctx_ndlp = lpfc_nlp_get(ndlp) deferred until mailbox
         * command issued in lpfc_cmpl_els_acc().
         */
        login_mbox->vport = vport;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= (NLP_ACC_REGLOGIN | NLP_RCV_PLOGI);
        spin_unlock_irq(shost->host_lock);

        /*
         * If there is an outstanding PLOGI issued, abort it before
         * sending ACC rsp for received PLOGI. If pending plogi
         * is not canceled here, the plogi will be rejected by
         * remote port and will be retried. On a configuration with
         * single discovery thread, this will cause a huge delay in
         * discovery. Also this will cause multiple state machines
         * running in parallel for this node.
         * This only applies to a fabric environment.
         */
        if ((ndlp->nlp_state == NLP_STE_PLOGI_ISSUE) &&
            (vport->fc_flag & FC_FABRIC)) {
                /* software abort outstanding PLOGI */
                lpfc_els_abort(phba, ndlp);
        }

        if ((vport->port_type == LPFC_NPIV_PORT &&
             vport->cfg_restrict_login)) {

                /* no deferred ACC */
                kfree(save_iocb);

                /* In order to preserve RPIs, we want to cleanup
                 * the default RPI the firmware created to rcv
                 * this ELS request. The only way to do this is
                 * to register, then unregister the RPI.
                 */
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_RM_DFLT_RPI;
                spin_unlock_irq(shost->host_lock);
                stat.un.b.lsRjtRsnCode = LSRJT_INVALID_CMD;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
                rc = lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb,
                        ndlp, login_mbox);
                if (rc)
                        mempool_free(login_mbox, phba->mbox_mem_pool);
                return 1;
        }
        if (defer_acc) {
                /* So the order here should be:
                 * SLI3 pt2pt
                 *   Issue CONFIG_LINK mbox
                 *   CONFIG_LINK cmpl
                 * SLI4 tgt
                 *   Issue UNREG RPI mbx
                 *   UNREG RPI cmpl
                 * Issue PLOGI ACC
                 * PLOGI ACC cmpl
                 * Issue REG_LOGIN mbox
                 */

                /* Save the REG_LOGIN mbox for and rcv IOCB copy later */
                link_mbox->context3 = login_mbox;
                login_mbox->context3 = save_iocb;

                /* Start the ball rolling by issuing CONFIG_LINK here */
                rc = lpfc_sli_issue_mbox(phba, link_mbox, MBX_NOWAIT);
                if (rc == MBX_NOT_FINISHED)
                        goto out;
                return 1;
        }

        rc = lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, cmdiocb, ndlp, login_mbox);
        if (rc)
                mempool_free(login_mbox, phba->mbox_mem_pool);
        return 1;
out:
        if (defer_acc)
                lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
                                "4577 discovery failure: %p %p %p\n",
                                save_iocb, link_mbox, login_mbox);
        kfree(save_iocb);
        if (link_mbox)
                mempool_free(link_mbox, phba->mbox_mem_pool);
        if (login_mbox)
                mempool_free(login_mbox, phba->mbox_mem_pool);

        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_OUT_OF_RESOURCE;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return 0;
}

/**
 * lpfc_mbx_cmpl_resume_rpi - Resume RPI completion routine
 * @phba: pointer to lpfc hba data structure.
 * @mboxq: pointer to mailbox object
 *
 * This routine is invoked to issue a completion to a rcv'ed
 * ADISC or PDISC after the paused RPI has been resumed.
 **/
static void
lpfc_mbx_cmpl_resume_rpi(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
{
        struct lpfc_vport *vport;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_nodelist *ndlp;
        uint32_t cmd;

        elsiocb = (struct lpfc_iocbq *)mboxq->ctx_buf;
        ndlp = (struct lpfc_nodelist *)mboxq->ctx_ndlp;
        vport = mboxq->vport;
        cmd = elsiocb->drvrTimeout;

        if (cmd == ELS_CMD_ADISC) {
                lpfc_els_rsp_adisc_acc(vport, elsiocb, ndlp);
        } else {
                lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, elsiocb,
                        ndlp, NULL);
        }
        kfree(elsiocb);
        mempool_free(mboxq, phba->mbox_mem_pool);
}

static int
lpfc_rcv_padisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                struct lpfc_iocbq *cmdiocb)
{
        struct Scsi_Host   *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq  *elsiocb;
        struct lpfc_dmabuf *pcmd;
        struct serv_parm   *sp;
        struct lpfc_name   *pnn, *ppn;
        struct ls_rjt stat;
        ADISC *ap;
        IOCB_t *icmd;
        uint32_t *lp;
        uint32_t cmd;

        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;

        cmd = *lp++;
        if (cmd == ELS_CMD_ADISC) {
                ap = (ADISC *) lp;
                pnn = (struct lpfc_name *) & ap->nodeName;
                ppn = (struct lpfc_name *) & ap->portName;
        } else {
                sp = (struct serv_parm *) lp;
                pnn = (struct lpfc_name *) & sp->nodeName;
                ppn = (struct lpfc_name *) & sp->portName;
        }

        icmd = &cmdiocb->iocb;
        if (icmd->ulpStatus == 0 && lpfc_check_adisc(vport, ndlp, pnn, ppn)) {

                /*
                 * As soon as  we send ACC, the remote NPort can
                 * start sending us data. Thus, for SLI4 we must
                 * resume the RPI before the ACC goes out.
                 */
                if (vport->phba->sli_rev == LPFC_SLI_REV4) {
                        elsiocb = kmalloc(sizeof(struct lpfc_iocbq),
                                GFP_KERNEL);
                        if (elsiocb) {

                                /* Save info from cmd IOCB used in rsp */
                                memcpy((uint8_t *)elsiocb, (uint8_t *)cmdiocb,
                                        sizeof(struct lpfc_iocbq));

                                /* Save the ELS cmd */
                                elsiocb->drvrTimeout = cmd;

                                lpfc_sli4_resume_rpi(ndlp,
                                        lpfc_mbx_cmpl_resume_rpi, elsiocb);
                                goto out;
                        }
                }

                if (cmd == ELS_CMD_ADISC) {
                        lpfc_els_rsp_adisc_acc(vport, cmdiocb, ndlp);
                } else {
                        lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, cmdiocb,
                                ndlp, NULL);
                }
out:
                /* If we are authenticated, move to the proper state.
                 * It is possible an ADISC arrived and the remote nport
                 * is already in MAPPED or UNMAPPED state.  Catch this
                 * condition and don't set the nlp_state again because
                 * it causes an unnecessary transport unregister/register.
                 */
                if (ndlp->nlp_type & (NLP_FCP_TARGET | NLP_NVME_TARGET)) {
                        if (ndlp->nlp_state != NLP_STE_MAPPED_NODE)
                                lpfc_nlp_set_state(vport, ndlp,
                                                   NLP_STE_MAPPED_NODE);
                }

                return 1;
        }
        /* Reject this request because invalid parameters */
        stat.un.b.lsRjtRsvd0 = 0;
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_SPARM_OPTIONS;
        stat.un.b.vendorUnique = 0;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);

        /* 1 sec timeout */
        mod_timer(&ndlp->nlp_delayfunc, jiffies + msecs_to_jiffies(1000));

        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_DELAY_TMO;
        spin_unlock_irq(shost->host_lock);
        ndlp->nlp_last_elscmd = ELS_CMD_PLOGI;
        ndlp->nlp_prev_state = ndlp->nlp_state;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        return 0;
}

static int
lpfc_rcv_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
              struct lpfc_iocbq *cmdiocb, uint32_t els_cmd)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba    *phba = vport->phba;
        struct lpfc_vport **vports;
        int i, active_vlink_present = 0 ;

        /* Put ndlp in NPR state with 1 sec timeout for plogi, ACC logo */
        /* Only call LOGO ACC for first LOGO, this avoids sending unnecessary
         * PLOGIs during LOGO storms from a device.
         */
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_LOGO_ACC;
        spin_unlock_irq(shost->host_lock);
        if (els_cmd == ELS_CMD_PRLO)
                lpfc_els_rsp_acc(vport, ELS_CMD_PRLO, cmdiocb, ndlp, NULL);
        else
                lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);

        /* Notify transport of connectivity loss to trigger cleanup. */
        if (phba->nvmet_support &&
            ndlp->nlp_state == NLP_STE_UNMAPPED_NODE)
                lpfc_nvmet_invalidate_host(phba, ndlp);

        if (ndlp->nlp_DID == Fabric_DID) {
                if (vport->port_state <= LPFC_FDISC)
                        goto out;
                lpfc_linkdown_port(vport);
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_VPORT_LOGO_RCVD;
                spin_unlock_irq(shost->host_lock);
                vports = lpfc_create_vport_work_array(phba);
                if (vports) {
                        for (i = 0; i <= phba->max_vports && vports[i] != NULL;
                                        i++) {
                                if ((!(vports[i]->fc_flag &
                                        FC_VPORT_LOGO_RCVD)) &&
                                        (vports[i]->port_state > LPFC_FDISC)) {
                                        active_vlink_present = 1;
                                        break;
                                }
                        }
                        lpfc_destroy_vport_work_array(phba, vports);
                }

                /*
                 * Don't re-instantiate if vport is marked for deletion.
                 * If we are here first then vport_delete is going to wait
                 * for discovery to complete.
                 */
                if (!(vport->load_flag & FC_UNLOADING) &&
                                        active_vlink_present) {
                        /*
                         * If there are other active VLinks present,
                         * re-instantiate the Vlink using FDISC.
                         */
                        mod_timer(&ndlp->nlp_delayfunc,
                                  jiffies + msecs_to_jiffies(1000));
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag |= NLP_DELAY_TMO;
                        spin_unlock_irq(shost->host_lock);
                        ndlp->nlp_last_elscmd = ELS_CMD_FDISC;
                        vport->port_state = LPFC_FDISC;
                } else {
                        spin_lock_irq(shost->host_lock);
                        phba->pport->fc_flag &= ~FC_LOGO_RCVD_DID_CHNG;
                        spin_unlock_irq(shost->host_lock);
                        lpfc_retry_pport_discovery(phba);
                }
        } else if ((!(ndlp->nlp_type & NLP_FABRIC) &&
                ((ndlp->nlp_type & NLP_FCP_TARGET) ||
                !(ndlp->nlp_type & NLP_FCP_INITIATOR))) ||
                (ndlp->nlp_state == NLP_STE_ADISC_ISSUE)) {
                /* Only try to re-login if this is NOT a Fabric Node */
                mod_timer(&ndlp->nlp_delayfunc,
                          jiffies + msecs_to_jiffies(1000 * 1));
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_DELAY_TMO;
                spin_unlock_irq(shost->host_lock);

                ndlp->nlp_last_elscmd = ELS_CMD_PLOGI;
        }
out:
        ndlp->nlp_prev_state = ndlp->nlp_state;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);

        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~NLP_NPR_ADISC;
        spin_unlock_irq(shost->host_lock);
        /* The driver has to wait until the ACC completes before it continues
         * processing the LOGO.  The action will resume in
         * lpfc_cmpl_els_logo_acc routine. Since part of processing includes an
         * unreg_login, the driver waits so the ACC does not get aborted.
         */
        return 0;
}

static uint32_t
lpfc_rcv_prli_support_check(struct lpfc_vport *vport,
                            struct lpfc_nodelist *ndlp,
                            struct lpfc_iocbq *cmdiocb)
{
        struct ls_rjt stat;
        uint32_t *payload;
        uint32_t cmd;

        payload = ((struct lpfc_dmabuf *)cmdiocb->context2)->virt;
        cmd = *payload;
        if (vport->phba->nvmet_support) {
                /* Must be a NVME PRLI */
                if (cmd ==  ELS_CMD_PRLI)
                        goto out;
        } else {
                /* Initiator mode. */
                if (!vport->nvmei_support && (cmd == ELS_CMD_NVMEPRLI))
                        goto out;
        }
        return 1;
out:
        lpfc_printf_vlog(vport, KERN_WARNING, LOG_NVME_DISC,
                         "6115 Rcv PRLI (%x) check failed: ndlp rpi %d "
                         "state x%x flags x%x\n",
                         cmd, ndlp->nlp_rpi, ndlp->nlp_state,
                         ndlp->nlp_flag);
        memset(&stat, 0, sizeof(struct ls_rjt));
        stat.un.b.lsRjtRsnCode = LSRJT_CMD_UNSUPPORTED;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_REQ_UNSUPPORTED;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb,
                            ndlp, NULL);
        return 0;
}

static void
lpfc_rcv_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
              struct lpfc_iocbq *cmdiocb)
{
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_dmabuf *pcmd;
        uint32_t *lp;
        PRLI *npr;
        struct fc_rport *rport = ndlp->rport;
        u32 roles;

        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;
        npr = (PRLI *) ((uint8_t *) lp + sizeof (uint32_t));

        if ((npr->prliType == PRLI_FCP_TYPE) ||
            (npr->prliType == PRLI_NVME_TYPE)) {
                if (npr->initiatorFunc) {
                        if (npr->prliType == PRLI_FCP_TYPE)
                                ndlp->nlp_type |= NLP_FCP_INITIATOR;
                        if (npr->prliType == PRLI_NVME_TYPE)
                                ndlp->nlp_type |= NLP_NVME_INITIATOR;
                }
                if (npr->targetFunc) {
                        if (npr->prliType == PRLI_FCP_TYPE)
                                ndlp->nlp_type |= NLP_FCP_TARGET;
                        if (npr->prliType == PRLI_NVME_TYPE)
                                ndlp->nlp_type |= NLP_NVME_TARGET;
                        if (npr->writeXferRdyDis)
                                ndlp->nlp_flag |= NLP_FIRSTBURST;
                }
                if (npr->Retry && ndlp->nlp_type &
                                        (NLP_FCP_INITIATOR | NLP_FCP_TARGET))
                        ndlp->nlp_fcp_info |= NLP_FCP_2_DEVICE;

                if (npr->Retry && phba->nsler &&
                    ndlp->nlp_type & (NLP_NVME_INITIATOR | NLP_NVME_TARGET))
                        ndlp->nlp_nvme_info |= NLP_NVME_NSLER;


                /* If this driver is in nvme target mode, set the ndlp's fc4
                 * type to NVME provided the PRLI response claims NVME FC4
                 * type.  Target mode does not issue gft_id so doesn't get
                 * the fc4 type set until now.
                 */
                if (phba->nvmet_support && (npr->prliType == PRLI_NVME_TYPE)) {
                        ndlp->nlp_fc4_type |= NLP_FC4_NVME;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
                }
                if (npr->prliType == PRLI_FCP_TYPE)
                        ndlp->nlp_fc4_type |= NLP_FC4_FCP;
        }
        if (rport) {
                /* We need to update the rport role values */
                roles = FC_RPORT_ROLE_UNKNOWN;
                if (ndlp->nlp_type & NLP_FCP_INITIATOR)
                        roles |= FC_RPORT_ROLE_FCP_INITIATOR;
                if (ndlp->nlp_type & NLP_FCP_TARGET)
                        roles |= FC_RPORT_ROLE_FCP_TARGET;

                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_RPORT,
                        "rport rolechg:   role:x%x did:x%x flg:x%x",
                        roles, ndlp->nlp_DID, ndlp->nlp_flag);

                if (vport->cfg_enable_fc4_type != LPFC_ENABLE_NVME)
                        fc_remote_port_rolechg(rport, roles);
        }
}

static uint32_t
lpfc_disc_set_adisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (!(ndlp->nlp_flag & NLP_RPI_REGISTERED)) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_NPR_ADISC;
                spin_unlock_irq(shost->host_lock);
                return 0;
        }

        if (!(vport->fc_flag & FC_PT2PT)) {
                /* Check config parameter use-adisc or FCP-2 */
                if (vport->cfg_use_adisc && ((vport->fc_flag & FC_RSCN_MODE) ||
                    ((ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) &&
                     (ndlp->nlp_type & NLP_FCP_TARGET)))) {
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag |= NLP_NPR_ADISC;
                        spin_unlock_irq(shost->host_lock);
                        return 1;
                }
        }

        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~NLP_NPR_ADISC;
        spin_unlock_irq(shost->host_lock);
        lpfc_unreg_rpi(vport, ndlp);
        return 0;
}

/**
 * lpfc_release_rpi - Release a RPI by issuing unreg_login mailbox cmd.
 * @phba : Pointer to lpfc_hba structure.
 * @vport: Pointer to lpfc_vport structure.
 * @ndlp: Pointer to lpfc_nodelist structure.
 * @rpi  : rpi to be release.
 *
 * This function will send a unreg_login mailbox command to the firmware
 * to release a rpi.
 **/
static void
lpfc_release_rpi(struct lpfc_hba *phba, struct lpfc_vport *vport,
                 struct lpfc_nodelist *ndlp, uint16_t rpi)
{
        LPFC_MBOXQ_t *pmb;
        int rc;

        /* If there is already an UNREG in progress for this ndlp,
         * no need to queue up another one.
         */
        if (ndlp->nlp_flag & NLP_UNREG_INP) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                                 "1435 release_rpi SKIP UNREG x%x on "
                                 "NPort x%x deferred x%x  flg x%x "
                                 "Data: x%px\n",
                                 ndlp->nlp_rpi, ndlp->nlp_DID,
                                 ndlp->nlp_defer_did,
                                 ndlp->nlp_flag, ndlp);
                return;
        }

        pmb = (LPFC_MBOXQ_t *) mempool_alloc(phba->mbox_mem_pool,
                        GFP_KERNEL);
        if (!pmb)
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "2796 mailbox memory allocation failed \n");
        else {
                lpfc_unreg_login(phba, vport->vpi, rpi, pmb);
                pmb->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                pmb->vport = vport;
                pmb->ctx_ndlp = ndlp;

                if (((ndlp->nlp_DID & Fabric_DID_MASK) != Fabric_DID_MASK) &&
                    (!(vport->fc_flag & FC_OFFLINE_MODE)))
                        ndlp->nlp_flag |= NLP_UNREG_INP;

                lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                                 "1437 release_rpi UNREG x%x "
                                 "on NPort x%x flg x%x\n",
                                 ndlp->nlp_rpi, ndlp->nlp_DID, ndlp->nlp_flag);

                rc = lpfc_sli_issue_mbox(phba, pmb, MBX_NOWAIT);
                if (rc == MBX_NOT_FINISHED)
                        mempool_free(pmb, phba->mbox_mem_pool);
        }
}

static uint32_t
lpfc_disc_illegal(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                  void *arg, uint32_t evt)
{
        struct lpfc_hba *phba;
        LPFC_MBOXQ_t *pmb = (LPFC_MBOXQ_t *) arg;
        uint16_t rpi;

        phba = vport->phba;
        /* Release the RPI if reglogin completing */
        if (!(phba->pport->load_flag & FC_UNLOADING) &&
                (evt == NLP_EVT_CMPL_REG_LOGIN) &&
                (!pmb->u.mb.mbxStatus)) {
                rpi = pmb->u.mb.un.varWords[0];
                lpfc_release_rpi(phba, vport, ndlp, rpi);
        }
        lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                         "0271 Illegal State Transition: node x%x "
                         "event x%x, state x%x Data: x%x x%x\n",
                         ndlp->nlp_DID, evt, ndlp->nlp_state, ndlp->nlp_rpi,
                         ndlp->nlp_flag);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_plogi_illegal(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                  void *arg, uint32_t evt)
{
        /* This transition is only legal if we previously
         * rcv'ed a PLOGI. Since we don't want 2 discovery threads
         * working on the same NPortID, do nothing for this thread
         * to stop it.
         */
        if (!(ndlp->nlp_flag & NLP_RCV_PLOGI)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0272 Illegal State Transition: node x%x "
                                 "event x%x, state x%x Data: x%x x%x\n",
                                  ndlp->nlp_DID, evt, ndlp->nlp_state,
                                  ndlp->nlp_rpi, ndlp->nlp_flag);
        }
        return ndlp->nlp_state;
}

/* Start of Discovery State Machine routines */

static uint32_t
lpfc_rcv_plogi_unused_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb;

        cmdiocb = (struct lpfc_iocbq *) arg;

        if (lpfc_rcv_plogi(vport, ndlp, cmdiocb)) {
                return ndlp->nlp_state;
        }
        return NLP_STE_FREED_NODE;
}

static uint32_t
lpfc_rcv_els_unused_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        lpfc_issue_els_logo(vport, ndlp, 0);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_unused_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_LOGO_ACC;
        spin_unlock_irq(shost->host_lock);
        lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);

        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_logo_unused_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        return NLP_STE_FREED_NODE;
}

static uint32_t
lpfc_device_rm_unused_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        return NLP_STE_FREED_NODE;
}

static uint32_t
lpfc_device_recov_unused_node(struct lpfc_vport *vport,
                        struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_plogi_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct Scsi_Host   *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba   *phba = vport->phba;
        struct lpfc_iocbq *cmdiocb = arg;
        struct lpfc_dmabuf *pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        uint32_t *lp = (uint32_t *) pcmd->virt;
        struct serv_parm *sp = (struct serv_parm *) (lp + 1);
        struct ls_rjt stat;
        int port_cmp;

        memset(&stat, 0, sizeof (struct ls_rjt));

        /* For a PLOGI, we only accept if our portname is less
         * than the remote portname.
         */
        phba->fc_stat.elsLogiCol++;
        port_cmp = memcmp(&vport->fc_portname, &sp->portName,
                          sizeof(struct lpfc_name));

        if (port_cmp >= 0) {
                /* Reject this request because the remote node will accept
                   ours */
                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_CMD_IN_PROGRESS;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                        NULL);
        } else {
                if (lpfc_rcv_plogi(vport, ndlp, cmdiocb) &&
                    (ndlp->nlp_flag & NLP_NPR_2B_DISC) &&
                    (vport->num_disc_nodes)) {
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag &= ~NLP_NPR_2B_DISC;
                        spin_unlock_irq(shost->host_lock);
                        /* 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);
                        }
                }
        } /* If our portname was less */

        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_plogi_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;
        struct ls_rjt     stat;

        memset(&stat, 0, sizeof (struct ls_rjt));
        stat.un.b.lsRjtRsnCode = LSRJT_LOGICAL_BSY;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_plogi_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        /* Retrieve RPI from LOGO IOCB. RPI is used for CMD_ABORT_XRI_CN */
        if (vport->phba->sli_rev == LPFC_SLI_REV3)
                ndlp->nlp_rpi = cmdiocb->iocb.ulpIoTag;
                                /* software abort outstanding PLOGI */
        lpfc_els_abort(vport->phba, ndlp);

        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_LOGO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_els_plogi_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba   *phba = vport->phba;
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        /* software abort outstanding PLOGI */
        lpfc_els_abort(phba, ndlp);

        if (evt == NLP_EVT_RCV_LOGO) {
                lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
        } else {
                lpfc_issue_els_logo(vport, ndlp, 0);
        }

        /* Put ndlp in npr state set plogi timer for 1 sec */
        mod_timer(&ndlp->nlp_delayfunc, jiffies + msecs_to_jiffies(1000 * 1));
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_DELAY_TMO;
        spin_unlock_irq(shost->host_lock);
        ndlp->nlp_last_elscmd = ELS_CMD_PLOGI;
        ndlp->nlp_prev_state = NLP_STE_PLOGI_ISSUE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);

        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_plogi_plogi_issue(struct lpfc_vport *vport,
                            struct lpfc_nodelist *ndlp,
                            void *arg,
                            uint32_t evt)
{
        struct lpfc_hba    *phba = vport->phba;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq  *cmdiocb, *rspiocb;
        struct lpfc_dmabuf *pcmd, *prsp, *mp;
        uint32_t *lp;
        uint32_t vid, flag;
        IOCB_t *irsp;
        struct serv_parm *sp;
        uint32_t ed_tov;
        LPFC_MBOXQ_t *mbox;
        int rc;

        cmdiocb = (struct lpfc_iocbq *) arg;
        rspiocb = cmdiocb->context_un.rsp_iocb;

        if (ndlp->nlp_flag & NLP_ACC_REGLOGIN) {
                /* Recovery from PLOGI collision logic */
                return ndlp->nlp_state;
        }

        irsp = &rspiocb->iocb;

        if (irsp->ulpStatus)
                goto out;

        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;

        prsp = list_get_first(&pcmd->list, struct lpfc_dmabuf, list);
        if (!prsp)
                goto out;

        lp = (uint32_t *) prsp->virt;
        sp = (struct serv_parm *) ((uint8_t *) lp + sizeof (uint32_t));

        /* Some switches have FDMI servers returning 0 for WWN */
        if ((ndlp->nlp_DID != FDMI_DID) &&
                (wwn_to_u64(sp->portName.u.wwn) == 0 ||
                wwn_to_u64(sp->nodeName.u.wwn) == 0)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0142 PLOGI RSP: Invalid WWN.\n");
                goto out;
        }
        if (!lpfc_check_sparm(vport, ndlp, sp, CLASS3, 0))
                goto out;
        /* PLOGI chkparm OK */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0121 PLOGI chkparm OK Data: x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, ndlp->nlp_state,
                         ndlp->nlp_flag, ndlp->nlp_rpi);
        if (vport->cfg_fcp_class == 2 && (sp->cls2.classValid))
                ndlp->nlp_fcp_info |= CLASS2;
        else
                ndlp->nlp_fcp_info |= CLASS3;

        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;

        if ((vport->fc_flag & FC_PT2PT) &&
            (vport->fc_flag & FC_PT2PT_PLOGI)) {
                ed_tov = be32_to_cpu(sp->cmn.e_d_tov);
                if (sp->cmn.edtovResolution) {
                        /* E_D_TOV ticks are in nanoseconds */
                        ed_tov = (phba->fc_edtov + 999999) / 1000000;
                }

                ndlp->nlp_flag &= ~NLP_SUPPRESS_RSP;
                if ((phba->sli.sli_flag & LPFC_SLI_SUPPRESS_RSP) &&
                    sp->cmn.valid_vendor_ver_level) {
                        vid = be32_to_cpu(sp->un.vv.vid);
                        flag = be32_to_cpu(sp->un.vv.flags);
                        if ((vid == LPFC_VV_EMLX_ID) &&
                            (flag & LPFC_VV_SUPPRESS_RSP))
                                ndlp->nlp_flag |= NLP_SUPPRESS_RSP;
                }

                /*
                 * Use the larger EDTOV
                 * RATOV = 2 * EDTOV for pt-to-pt
                 */
                if (ed_tov > phba->fc_edtov)
                        phba->fc_edtov = ed_tov;
                phba->fc_ratov = (2 * phba->fc_edtov) / 1000;

                memcpy(&phba->fc_fabparam, sp, sizeof(struct serv_parm));

                /* Issue config_link / reg_vfi to account for updated TOV's */
                if (phba->sli_rev == LPFC_SLI_REV4) {
                        lpfc_issue_reg_vfi(vport);
                } else {
                        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
                        if (!mbox) {
                                lpfc_printf_vlog(vport, KERN_ERR,
                                                 LOG_TRACE_EVENT,
                                                 "0133 PLOGI: no memory "
                                                 "for config_link "
                                                 "Data: x%x x%x x%x x%x\n",
                                                 ndlp->nlp_DID, ndlp->nlp_state,
                                                 ndlp->nlp_flag, ndlp->nlp_rpi);
                                goto out;
                        }

                        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 out;
                        }
                }
        }

        lpfc_unreg_rpi(vport, ndlp);

        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mbox) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0018 PLOGI: no memory for reg_login "
                                 "Data: x%x x%x x%x x%x\n",
                                 ndlp->nlp_DID, ndlp->nlp_state,
                                 ndlp->nlp_flag, ndlp->nlp_rpi);
                goto out;
        }

        if (lpfc_reg_rpi(phba, vport->vpi, irsp->un.elsreq64.remoteID,
                         (uint8_t *) sp, mbox, ndlp->nlp_rpi) == 0) {
                switch (ndlp->nlp_DID) {
                case NameServer_DID:
                        mbox->mbox_cmpl = lpfc_mbx_cmpl_ns_reg_login;
                        break;
                case FDMI_DID:
                        mbox->mbox_cmpl = lpfc_mbx_cmpl_fdmi_reg_login;
                        break;
                default:
                        ndlp->nlp_flag |= NLP_REG_LOGIN_SEND;
                        mbox->mbox_cmpl = lpfc_mbx_cmpl_reg_login;
                }
                mbox->ctx_ndlp = lpfc_nlp_get(ndlp);
                mbox->vport = vport;
                if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT)
                    != MBX_NOT_FINISHED) {
                        lpfc_nlp_set_state(vport, ndlp,
                                           NLP_STE_REG_LOGIN_ISSUE);
                        return ndlp->nlp_state;
                }
                if (ndlp->nlp_flag & NLP_REG_LOGIN_SEND)
                        ndlp->nlp_flag &= ~NLP_REG_LOGIN_SEND;
                /* decrement node reference count to the failed mbox
                 * command
                 */
                lpfc_nlp_put(ndlp);
                mp = (struct lpfc_dmabuf *)mbox->ctx_buf;
                lpfc_mbuf_free(phba, mp->virt, mp->phys);
                kfree(mp);
                mempool_free(mbox, phba->mbox_mem_pool);

                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0134 PLOGI: cannot issue reg_login "
                                 "Data: x%x x%x x%x x%x\n",
                                 ndlp->nlp_DID, ndlp->nlp_state,
                                 ndlp->nlp_flag, ndlp->nlp_rpi);
        } else {
                mempool_free(mbox, phba->mbox_mem_pool);

                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0135 PLOGI: cannot format reg_login "
                                 "Data: x%x x%x x%x x%x\n",
                                 ndlp->nlp_DID, ndlp->nlp_state,
                                 ndlp->nlp_flag, ndlp->nlp_rpi);
        }


out:
        if (ndlp->nlp_DID == NameServer_DID) {
                lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0261 Cannot Register NameServer login\n");
        }

        /*
        ** In case the node reference counter does not go to zero, ensure that
        ** the stale state for the node is not processed.
        */

        ndlp->nlp_prev_state = ndlp->nlp_state;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_DEFER_RM;
        spin_unlock_irq(shost->host_lock);
        return NLP_STE_FREED_NODE;
}

static uint32_t
lpfc_cmpl_logo_plogi_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_reglogin_plogi_issue(struct lpfc_vport *vport,
        struct lpfc_nodelist *ndlp, void *arg, uint32_t evt)
{
        struct lpfc_hba *phba;
        LPFC_MBOXQ_t *pmb = (LPFC_MBOXQ_t *) arg;
        MAILBOX_t *mb = &pmb->u.mb;
        uint16_t rpi;

        phba = vport->phba;
        /* Release the RPI */
        if (!(phba->pport->load_flag & FC_UNLOADING) &&
                !mb->mbxStatus) {
                rpi = pmb->u.mb.un.varWords[0];
                lpfc_release_rpi(phba, vport, ndlp, rpi);
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_device_rm_plogi_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (ndlp->nlp_flag & NLP_NPR_2B_DISC) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NODEV_REMOVE;
                spin_unlock_irq(shost->host_lock);
                return ndlp->nlp_state;
        } else {
                /* software abort outstanding PLOGI */
                lpfc_els_abort(vport->phba, ndlp);

                lpfc_drop_node(vport, ndlp);
                return NLP_STE_FREED_NODE;
        }
}

static uint32_t
lpfc_device_recov_plogi_issue(struct lpfc_vport *vport,
                              struct lpfc_nodelist *ndlp,
                              void *arg,
                              uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;

        /* Don't do anything that will mess up processing of the
         * previous RSCN.
         */
        if (vport->fc_flag & FC_RSCN_DEFERRED)
                return ndlp->nlp_state;

        /* software abort outstanding PLOGI */
        lpfc_els_abort(phba, ndlp);

        ndlp->nlp_prev_state = NLP_STE_PLOGI_ISSUE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        spin_unlock_irq(shost->host_lock);

        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_adisc_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct Scsi_Host   *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba   *phba = vport->phba;
        struct lpfc_iocbq *cmdiocb;

        /* software abort outstanding ADISC */
        lpfc_els_abort(phba, ndlp);

        cmdiocb = (struct lpfc_iocbq *) arg;

        if (lpfc_rcv_plogi(vport, ndlp, cmdiocb)) {
                if (ndlp->nlp_flag & NLP_NPR_2B_DISC) {
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag &= ~NLP_NPR_2B_DISC;
                        spin_unlock_irq(shost->host_lock);
                        if (vport->num_disc_nodes)
                                lpfc_more_adisc(vport);
                }
                return ndlp->nlp_state;
        }
        ndlp->nlp_prev_state = NLP_STE_ADISC_ISSUE;
        lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0);
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);

        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_adisc_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        if (lpfc_rcv_prli_support_check(vport, ndlp, cmdiocb))
                lpfc_els_rsp_prli_acc(vport, cmdiocb, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_adisc_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_iocbq *cmdiocb;

        cmdiocb = (struct lpfc_iocbq *) arg;

        /* software abort outstanding ADISC */
        lpfc_els_abort(phba, ndlp);

        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_LOGO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_padisc_adisc_issue(struct lpfc_vport *vport,
                            struct lpfc_nodelist *ndlp,
                            void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb;

        cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_padisc(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prlo_adisc_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb;

        cmdiocb = (struct lpfc_iocbq *) arg;

        /* Treat like rcv logo */
        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_PRLO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_adisc_adisc_issue(struct lpfc_vport *vport,
                            struct lpfc_nodelist *ndlp,
                            void *arg, uint32_t evt)
{
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba   *phba = vport->phba;
        struct lpfc_iocbq *cmdiocb, *rspiocb;
        IOCB_t *irsp;
        ADISC *ap;
        int rc;

        cmdiocb = (struct lpfc_iocbq *) arg;
        rspiocb = cmdiocb->context_un.rsp_iocb;

        ap = (ADISC *)lpfc_check_elscmpl_iocb(phba, cmdiocb, rspiocb);
        irsp = &rspiocb->iocb;

        if ((irsp->ulpStatus) ||
            (!lpfc_check_adisc(vport, ndlp, &ap->nodeName, &ap->portName))) {
                /* 1 sec timeout */
                mod_timer(&ndlp->nlp_delayfunc,
                          jiffies + msecs_to_jiffies(1000));
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_DELAY_TMO;
                spin_unlock_irq(shost->host_lock);
                ndlp->nlp_last_elscmd = ELS_CMD_PLOGI;

                memset(&ndlp->nlp_nodename, 0, sizeof(struct lpfc_name));
                memset(&ndlp->nlp_portname, 0, sizeof(struct lpfc_name));

                ndlp->nlp_prev_state = NLP_STE_ADISC_ISSUE;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                lpfc_unreg_rpi(vport, ndlp);
                return ndlp->nlp_state;
        }

        if (phba->sli_rev == LPFC_SLI_REV4) {
                rc = lpfc_sli4_resume_rpi(ndlp, NULL, NULL);
                if (rc) {
                        /* Stay in state and retry. */
                        ndlp->nlp_prev_state = NLP_STE_ADISC_ISSUE;
                        return ndlp->nlp_state;
                }
        }

        if (ndlp->nlp_type & NLP_FCP_TARGET)
                ndlp->nlp_fc4_type |= NLP_FC4_FCP;

        if (ndlp->nlp_type & NLP_NVME_TARGET)
                ndlp->nlp_fc4_type |= NLP_FC4_NVME;

        if (ndlp->nlp_type & (NLP_FCP_TARGET | NLP_NVME_TARGET)) {
                ndlp->nlp_prev_state = NLP_STE_ADISC_ISSUE;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_MAPPED_NODE);
        } else {
                ndlp->nlp_prev_state = NLP_STE_ADISC_ISSUE;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
        }

        return ndlp->nlp_state;
}

static uint32_t
lpfc_device_rm_adisc_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (ndlp->nlp_flag & NLP_NPR_2B_DISC) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NODEV_REMOVE;
                spin_unlock_irq(shost->host_lock);
                return ndlp->nlp_state;
        } else {
                /* software abort outstanding ADISC */
                lpfc_els_abort(vport->phba, ndlp);

                lpfc_drop_node(vport, ndlp);
                return NLP_STE_FREED_NODE;
        }
}

static uint32_t
lpfc_device_recov_adisc_issue(struct lpfc_vport *vport,
                              struct lpfc_nodelist *ndlp,
                              void *arg,
                              uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;

        /* Don't do anything that will mess up processing of the
         * previous RSCN.
         */
        if (vport->fc_flag & FC_RSCN_DEFERRED)
                return ndlp->nlp_state;

        /* software abort outstanding ADISC */
        lpfc_els_abort(phba, ndlp);

        ndlp->nlp_prev_state = NLP_STE_ADISC_ISSUE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        spin_unlock_irq(shost->host_lock);
        lpfc_disc_set_adisc(vport, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_reglogin_issue(struct lpfc_vport *vport,
                              struct lpfc_nodelist *ndlp,
                              void *arg,
                              uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_plogi(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_reglogin_issue(struct lpfc_vport *vport,
                             struct lpfc_nodelist *ndlp,
                             void *arg,
                             uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;
        struct ls_rjt     stat;

        if (!lpfc_rcv_prli_support_check(vport, ndlp, cmdiocb)) {
                return ndlp->nlp_state;
        }
        if (vport->phba->nvmet_support) {
                /* NVME Target mode.  Handle and respond to the PRLI and
                 * transition to UNMAPPED provided the RPI has completed
                 * registration.
                 */
                if (ndlp->nlp_flag & NLP_RPI_REGISTERED) {
                        lpfc_rcv_prli(vport, ndlp, cmdiocb);
                        lpfc_els_rsp_prli_acc(vport, cmdiocb, ndlp);
                } else {
                        /* RPI registration has not completed. Reject the PRLI
                         * to prevent an illegal state transition when the
                         * rpi registration does complete.
                         */
                        memset(&stat, 0, sizeof(struct ls_rjt));
                        stat.un.b.lsRjtRsnCode = LSRJT_LOGICAL_BSY;
                        stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
                        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb,
                                            ndlp, NULL);
                        return ndlp->nlp_state;
                }
        } else {
                /* Initiator mode. */
                lpfc_els_rsp_prli_acc(vport, cmdiocb, ndlp);
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_reglogin_issue(struct lpfc_vport *vport,
                             struct lpfc_nodelist *ndlp,
                             void *arg,
                             uint32_t evt)
{
        struct lpfc_hba   *phba = vport->phba;
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;
        LPFC_MBOXQ_t      *mb;
        LPFC_MBOXQ_t      *nextmb;
        struct lpfc_dmabuf *mp;
        struct lpfc_nodelist *ns_ndlp;

        cmdiocb = (struct lpfc_iocbq *) arg;

        /* cleanup any ndlp on mbox q waiting for reglogin cmpl */
        if ((mb = phba->sli.mbox_active)) {
                if ((mb->u.mb.mbxCommand == MBX_REG_LOGIN64) &&
                   (ndlp == (struct lpfc_nodelist *)mb->ctx_ndlp)) {
                        ndlp->nlp_flag &= ~NLP_REG_LOGIN_SEND;
                        lpfc_nlp_put(ndlp);
                        mb->ctx_ndlp = NULL;
                        mb->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                }
        }

        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(mb, nextmb, &phba->sli.mboxq, list) {
                if ((mb->u.mb.mbxCommand == MBX_REG_LOGIN64) &&
                   (ndlp == (struct lpfc_nodelist *)mb->ctx_ndlp)) {
                        mp = (struct lpfc_dmabuf *)(mb->ctx_buf);
                        if (mp) {
                                __lpfc_mbuf_free(phba, mp->virt, mp->phys);
                                kfree(mp);
                        }
                        ndlp->nlp_flag &= ~NLP_REG_LOGIN_SEND;
                        lpfc_nlp_put(ndlp);
                        list_del(&mb->list);
                        phba->sli.mboxq_cnt--;
                        mempool_free(mb, phba->mbox_mem_pool);
                }
        }
        spin_unlock_irq(&phba->hbalock);

        /* software abort if any GID_FT is outstanding */
        if (vport->cfg_enable_fc4_type != LPFC_ENABLE_FCP) {
                ns_ndlp = lpfc_findnode_did(vport, NameServer_DID);
                if (ns_ndlp && NLP_CHK_NODE_ACT(ns_ndlp))
                        lpfc_els_abort(phba, ns_ndlp);
        }

        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_LOGO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_padisc_reglogin_issue(struct lpfc_vport *vport,
                               struct lpfc_nodelist *ndlp,
                               void *arg,
                               uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_padisc(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prlo_reglogin_issue(struct lpfc_vport *vport,
                             struct lpfc_nodelist *ndlp,
                             void *arg,
                             uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb;

        cmdiocb = (struct lpfc_iocbq *) arg;
        lpfc_els_rsp_acc(vport, ELS_CMD_PRLO, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_reglogin_reglogin_issue(struct lpfc_vport *vport,
                                  struct lpfc_nodelist *ndlp,
                                  void *arg,
                                  uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba *phba = vport->phba;
        LPFC_MBOXQ_t *pmb = (LPFC_MBOXQ_t *) arg;
        MAILBOX_t *mb = &pmb->u.mb;
        uint32_t did  = mb->un.varWords[1];

        if (mb->mbxStatus) {
                /* RegLogin failed */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "0246 RegLogin failed Data: x%x x%x x%x x%x "
                                 "x%x\n",
                                 did, mb->mbxStatus, vport->port_state,
                                 mb->un.varRegLogin.vpi,
                                 mb->un.varRegLogin.rpi);
                /*
                 * If RegLogin failed due to lack of HBA resources do not
                 * retry discovery.
                 */
                if (mb->mbxStatus == MBXERR_RPI_FULL) {
                        ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                        return ndlp->nlp_state;
                }

                /* Put ndlp in npr state set plogi timer for 1 sec */
                mod_timer(&ndlp->nlp_delayfunc,
                          jiffies + msecs_to_jiffies(1000 * 1));
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_DELAY_TMO;
                spin_unlock_irq(shost->host_lock);
                ndlp->nlp_last_elscmd = ELS_CMD_PLOGI;

                lpfc_issue_els_logo(vport, ndlp, 0);
                ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                return ndlp->nlp_state;
        }

        /* SLI4 ports have preallocated logical rpis. */
        if (phba->sli_rev < LPFC_SLI_REV4)
                ndlp->nlp_rpi = mb->un.varWords[0];

        ndlp->nlp_flag |= NLP_RPI_REGISTERED;

        /* Only if we are not a fabric nport do we issue PRLI */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                         "3066 RegLogin Complete on x%x x%x x%x\n",
                         did, ndlp->nlp_type, ndlp->nlp_fc4_type);
        if (!(ndlp->nlp_type & NLP_FABRIC) &&
            (phba->nvmet_support == 0)) {
                /* The driver supports FCP and NVME concurrently.  If the
                 * ndlp's nlp_fc4_type is still zero, the driver doesn't

                 * know what PRLI to send yet.  Figure that out now and
                 * call PRLI depending on the outcome.
                 */
                if (vport->fc_flag & FC_PT2PT) {
                        /* If we are pt2pt, there is no Fabric to determine
                         * the FC4 type of the remote nport. So if NVME
                         * is configured try it.
                         */
                        ndlp->nlp_fc4_type |= NLP_FC4_FCP;
                        if ((vport->cfg_enable_fc4_type == LPFC_ENABLE_BOTH) ||
                            (vport->cfg_enable_fc4_type == LPFC_ENABLE_NVME)) {
                                ndlp->nlp_fc4_type |= NLP_FC4_NVME;
                                /* We need to update the localport also */
                                lpfc_nvme_update_localport(vport);
                        }

                } else if (phba->fc_topology == LPFC_TOPOLOGY_LOOP) {
                        ndlp->nlp_fc4_type |= NLP_FC4_FCP;

                } else if (ndlp->nlp_fc4_type == 0) {
                        /* If we are only configured for FCP, the driver
                         * should just issue PRLI for FCP. Otherwise issue
                         * GFT_ID to determine if remote port supports NVME.
                         */
                        if (vport->cfg_enable_fc4_type != LPFC_ENABLE_FCP) {
                                lpfc_ns_cmd(vport, SLI_CTNS_GFT_ID, 0,
                                            ndlp->nlp_DID);
                                return ndlp->nlp_state;
                        }
                        ndlp->nlp_fc4_type = NLP_FC4_FCP;
                }

                ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_PRLI_ISSUE);
                if (lpfc_issue_els_prli(vport, ndlp, 0)) {
                        lpfc_issue_els_logo(vport, ndlp, 0);
                        ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                }
        } else {
                if ((vport->fc_flag & FC_PT2PT) && phba->nvmet_support)
                        phba->targetport->port_id = vport->fc_myDID;

                /* Only Fabric ports should transition. NVME target
                 * must complete PRLI.
                 */
                if (ndlp->nlp_type & NLP_FABRIC) {
                        ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
                }
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_device_rm_reglogin_issue(struct lpfc_vport *vport,
                              struct lpfc_nodelist *ndlp,
                              void *arg,
                              uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (ndlp->nlp_flag & NLP_NPR_2B_DISC) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NODEV_REMOVE;
                spin_unlock_irq(shost->host_lock);
                return ndlp->nlp_state;
        } else {
                lpfc_drop_node(vport, ndlp);
                return NLP_STE_FREED_NODE;
        }
}

static uint32_t
lpfc_device_recov_reglogin_issue(struct lpfc_vport *vport,
                                 struct lpfc_nodelist *ndlp,
                                 void *arg,
                                 uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        /* Don't do anything that will mess up processing of the
         * previous RSCN.
         */
        if (vport->fc_flag & FC_RSCN_DEFERRED)
                return ndlp->nlp_state;

        ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);

        /* If we are a target we won't immediately transition into PRLI,
         * so if REG_LOGIN already completed we don't need to ignore it.
         */
        if (!(ndlp->nlp_flag & NLP_RPI_REGISTERED) ||
            !vport->phba->nvmet_support)
                ndlp->nlp_flag |= NLP_IGNR_REG_CMPL;

        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        spin_unlock_irq(shost->host_lock);
        lpfc_disc_set_adisc(vport, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb;

        cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_plogi(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        if (!lpfc_rcv_prli_support_check(vport, ndlp, cmdiocb))
                return ndlp->nlp_state;
        lpfc_els_rsp_prli_acc(vport, cmdiocb, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        /* Software abort outstanding PRLI before sending acc */
        lpfc_els_abort(vport->phba, ndlp);

        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_LOGO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_padisc_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_padisc(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

/* This routine is envoked when we rcv a PRLO request from a nport
 * we are logged into.  We should send back a PRLO rsp setting the
 * appropriate bits.
 * NEXT STATE = PRLI_ISSUE
 */
static uint32_t
lpfc_rcv_prlo_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_els_rsp_acc(vport, ELS_CMD_PRLO, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_prli_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq *cmdiocb, *rspiocb;
        struct lpfc_hba   *phba = vport->phba;
        IOCB_t *irsp;
        PRLI *npr;
        struct lpfc_nvme_prli *nvpr;
        void *temp_ptr;

        cmdiocb = (struct lpfc_iocbq *) arg;
        rspiocb = cmdiocb->context_un.rsp_iocb;

        /* A solicited PRLI is either FCP or NVME.  The PRLI cmd/rsp
         * format is different so NULL the two PRLI types so that the
         * driver correctly gets the correct context.
         */
        npr = NULL;
        nvpr = NULL;
        temp_ptr = lpfc_check_elscmpl_iocb(phba, cmdiocb, rspiocb);
        if (cmdiocb->iocb_flag & LPFC_PRLI_FCP_REQ)
                npr = (PRLI *) temp_ptr;
        else if (cmdiocb->iocb_flag & LPFC_PRLI_NVME_REQ)
                nvpr = (struct lpfc_nvme_prli *) temp_ptr;

        irsp = &rspiocb->iocb;
        if (irsp->ulpStatus) {
                if ((vport->port_type == LPFC_NPIV_PORT) &&
                    vport->cfg_restrict_login) {
                        goto out;
                }

                /* Adjust the nlp_type accordingly if the PRLI failed */
                if (npr)
                        ndlp->nlp_fc4_type &= ~NLP_FC4_FCP;
                if (nvpr)
                        ndlp->nlp_fc4_type &= ~NLP_FC4_NVME;

                /* We can't set the DSM state till BOTH PRLIs complete */
                goto out_err;
        }

        if (npr && (npr->acceptRspCode == PRLI_REQ_EXECUTED) &&
            (npr->prliType == PRLI_FCP_TYPE)) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                                 "6028 FCP NPR PRLI Cmpl Init %d Target %d\n",
                                 npr->initiatorFunc,
                                 npr->targetFunc);
                if (npr->initiatorFunc)
                        ndlp->nlp_type |= NLP_FCP_INITIATOR;
                if (npr->targetFunc) {
                        ndlp->nlp_type |= NLP_FCP_TARGET;
                        if (npr->writeXferRdyDis)
                                ndlp->nlp_flag |= NLP_FIRSTBURST;
                }
                if (npr->Retry)
                        ndlp->nlp_fcp_info |= NLP_FCP_2_DEVICE;

        } else if (nvpr &&
                   (bf_get_be32(prli_acc_rsp_code, nvpr) ==
                    PRLI_REQ_EXECUTED) &&
                   (bf_get_be32(prli_type_code, nvpr) ==
                    PRLI_NVME_TYPE)) {

                /* Complete setting up the remote ndlp personality. */
                if (bf_get_be32(prli_init, nvpr))
                        ndlp->nlp_type |= NLP_NVME_INITIATOR;

                if (phba->nsler && bf_get_be32(prli_nsler, nvpr) &&
                    bf_get_be32(prli_conf, nvpr))

                        ndlp->nlp_nvme_info |= NLP_NVME_NSLER;
                else
                        ndlp->nlp_nvme_info &= ~NLP_NVME_NSLER;

                /* Target driver cannot solicit NVME FB. */
                if (bf_get_be32(prli_tgt, nvpr)) {
                        /* Complete the nvme target roles.  The transport
                         * needs to know if the rport is capable of
                         * discovery in addition to its role.
                         */
                        ndlp->nlp_type |= NLP_NVME_TARGET;
                        if (bf_get_be32(prli_disc, nvpr))
                                ndlp->nlp_type |= NLP_NVME_DISCOVERY;

                        /*
                         * If prli_fba is set, the Target supports FirstBurst.
                         * If prli_fb_sz is 0, the FirstBurst size is unlimited,
                         * otherwise it defines the actual size supported by
                         * the NVME Target.
                         */
                        if ((bf_get_be32(prli_fba, nvpr) == 1) &&
                            (phba->cfg_nvme_enable_fb) &&
                            (!phba->nvmet_support)) {
                                /* Both sides support FB. The target's first
                                 * burst size is a 512 byte encoded value.
                                 */
                                ndlp->nlp_flag |= NLP_FIRSTBURST;
                                ndlp->nvme_fb_size = bf_get_be32(prli_fb_sz,
                                                                 nvpr);

                                /* Expressed in units of 512 bytes */
                                if (ndlp->nvme_fb_size)
                                        ndlp->nvme_fb_size <<=
                                                LPFC_NVME_FB_SHIFT;
                                else
                                        ndlp->nvme_fb_size = LPFC_NVME_MAX_FB;
                        }
                }

                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                                 "6029 NVME PRLI Cmpl w1 x%08x "
                                 "w4 x%08x w5 x%08x flag x%x, "
                                 "fcp_info x%x nlp_type x%x\n",
                                 be32_to_cpu(nvpr->word1),
                                 be32_to_cpu(nvpr->word4),
                                 be32_to_cpu(nvpr->word5),
                                 ndlp->nlp_flag, ndlp->nlp_fcp_info,
                                 ndlp->nlp_type);
        }
        if (!(ndlp->nlp_type & NLP_FCP_TARGET) &&
            (vport->port_type == LPFC_NPIV_PORT) &&
             vport->cfg_restrict_login) {
out:
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_TARGET_REMOVE;
                spin_unlock_irq(shost->host_lock);
                lpfc_issue_els_logo(vport, ndlp, 0);

                ndlp->nlp_prev_state = NLP_STE_PRLI_ISSUE;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                return ndlp->nlp_state;
        }

out_err:
        /* The ndlp state cannot move to MAPPED or UNMAPPED before all PRLIs
         * are complete.
         */
        if (ndlp->fc4_prli_sent == 0) {
                ndlp->nlp_prev_state = NLP_STE_PRLI_ISSUE;
                if (ndlp->nlp_type & (NLP_FCP_TARGET | NLP_NVME_TARGET))
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_MAPPED_NODE);
                else if (ndlp->nlp_type &
                         (NLP_FCP_INITIATOR | NLP_NVME_INITIATOR))
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
        } else
                lpfc_printf_vlog(vport,
                                 KERN_INFO, LOG_ELS,
                                 "3067 PRLI's still outstanding "
                                 "on x%06x - count %d, Pend Node Mode "
                                 "transition...\n",
                                 ndlp->nlp_DID, ndlp->fc4_prli_sent);

        return ndlp->nlp_state;
}

/*! lpfc_device_rm_prli_issue
 *
 * \pre
 * \post
 * \param   phba
 * \param   ndlp
 * \param   arg
 * \param   evt
 * \return  uint32_t
 *
 * \b Description:
 *    This routine is envoked when we a request to remove a nport we are in the
 *    process of PRLIing. We should software abort outstanding prli, unreg
 *    login, send a logout. We will change node state to UNUSED_NODE, put it
 *    on plogi list so it can be freed when LOGO completes.
 *
 */

static uint32_t
lpfc_device_rm_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (ndlp->nlp_flag & NLP_NPR_2B_DISC) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NODEV_REMOVE;
                spin_unlock_irq(shost->host_lock);
                return ndlp->nlp_state;
        } else {
                /* software abort outstanding PLOGI */
                lpfc_els_abort(vport->phba, ndlp);

                lpfc_drop_node(vport, ndlp);
                return NLP_STE_FREED_NODE;
        }
}


/*! lpfc_device_recov_prli_issue
 *
 * \pre
 * \post
 * \param   phba
 * \param   ndlp
 * \param   arg
 * \param   evt
 * \return  uint32_t
 *
 * \b Description:
 *    The routine is envoked when the state of a device is unknown, like
 *    during a link down. We should remove the nodelist entry from the
 *    unmapped list, issue a UNREG_LOGIN, do a software abort of the
 *    outstanding PRLI command, then free the node entry.
 */
static uint32_t
lpfc_device_recov_prli_issue(struct lpfc_vport *vport,
                             struct lpfc_nodelist *ndlp,
                             void *arg,
                             uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;

        /* Don't do anything that will mess up processing of the
         * previous RSCN.
         */
        if (vport->fc_flag & FC_RSCN_DEFERRED)
                return ndlp->nlp_state;

        /* software abort outstanding PRLI */
        lpfc_els_abort(phba, ndlp);

        ndlp->nlp_prev_state = NLP_STE_PRLI_ISSUE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        spin_unlock_irq(shost->host_lock);
        lpfc_disc_set_adisc(vport, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_logo_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *)arg;
        struct ls_rjt     stat;

        memset(&stat, 0, sizeof(struct ls_rjt));
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_logo_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *)arg;
        struct ls_rjt     stat;

        memset(&stat, 0, sizeof(struct ls_rjt));
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_logo_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *)arg;

        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_LOGO_ACC;
        spin_unlock_irq(shost->host_lock);
        lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_padisc_logo_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *)arg;
        struct ls_rjt     stat;

        memset(&stat, 0, sizeof(struct ls_rjt));
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prlo_logo_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *)arg;
        struct ls_rjt     stat;

        memset(&stat, 0, sizeof(struct ls_rjt));
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_logo_logo_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        ndlp->nlp_prev_state = NLP_STE_LOGO_ISSUE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        spin_unlock_irq(shost->host_lock);
        lpfc_disc_set_adisc(vport, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_device_rm_logo_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        /*
         * DevLoss has timed out and is calling for Device Remove.
         * In this case, abort the LOGO and cleanup the ndlp
         */

        lpfc_unreg_rpi(vport, ndlp);
        /* software abort outstanding PLOGI */
        lpfc_els_abort(vport->phba, ndlp);
        lpfc_drop_node(vport, ndlp);
        return NLP_STE_FREED_NODE;
}

static uint32_t
lpfc_device_recov_logo_issue(struct lpfc_vport *vport,
                             struct lpfc_nodelist *ndlp,
                             void *arg, uint32_t evt)
{
        /*
         * Device Recovery events have no meaning for a node with a LOGO
         * outstanding.  The LOGO has to complete first and handle the
         * node from that point.
         */
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_unmap_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_plogi(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_unmap_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        if (!lpfc_rcv_prli_support_check(vport, ndlp, cmdiocb))
                return ndlp->nlp_state;

        lpfc_rcv_prli(vport, ndlp, cmdiocb);
        lpfc_els_rsp_prli_acc(vport, cmdiocb, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_unmap_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_LOGO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_padisc_unmap_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_padisc(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prlo_unmap_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_els_rsp_acc(vport, ELS_CMD_PRLO, cmdiocb, ndlp, NULL);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_device_recov_unmap_node(struct lpfc_vport *vport,
                             struct lpfc_nodelist *ndlp,
                             void *arg,
                             uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        ndlp->nlp_prev_state = NLP_STE_UNMAPPED_NODE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        ndlp->nlp_fc4_type &= ~(NLP_FC4_FCP | NLP_FC4_NVME);
        spin_unlock_irq(shost->host_lock);
        lpfc_disc_set_adisc(vport, ndlp);

        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_mapped_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_plogi(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_mapped_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        if (!lpfc_rcv_prli_support_check(vport, ndlp, cmdiocb))
                return ndlp->nlp_state;
        lpfc_els_rsp_prli_acc(vport, cmdiocb, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_mapped_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_LOGO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_padisc_mapped_node(struct lpfc_vport *vport,
                            struct lpfc_nodelist *ndlp,
                            void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_padisc(vport, ndlp, cmdiocb);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prlo_mapped_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          void *arg, uint32_t evt)
{
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        /* flush the target */
        lpfc_sli_abort_iocb(vport, &phba->sli.sli3_ring[LPFC_FCP_RING],
                            ndlp->nlp_sid, 0, LPFC_CTX_TGT);

        /* Treat like rcv logo */
        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_PRLO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_device_recov_mapped_node(struct lpfc_vport *vport,
                              struct lpfc_nodelist *ndlp,
                              void *arg,
                              uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        ndlp->nlp_prev_state = NLP_STE_MAPPED_NODE;
        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        ndlp->nlp_fc4_type &= ~(NLP_FC4_FCP | NLP_FC4_NVME);
        spin_unlock_irq(shost->host_lock);
        lpfc_disc_set_adisc(vport, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_plogi_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                        void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq *cmdiocb  = (struct lpfc_iocbq *) arg;

        /* Ignore PLOGI if we have an outstanding LOGO */
        if (ndlp->nlp_flag & (NLP_LOGO_SND | NLP_LOGO_ACC))
                return ndlp->nlp_state;
        if (lpfc_rcv_plogi(vport, ndlp, cmdiocb)) {
                lpfc_cancel_retry_delay_tmo(vport, ndlp);
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~(NLP_NPR_ADISC | NLP_NPR_2B_DISC);
                spin_unlock_irq(shost->host_lock);
        } else if (!(ndlp->nlp_flag & NLP_NPR_2B_DISC)) {
                /* send PLOGI immediately, move to PLOGI issue state */
                if (!(ndlp->nlp_flag & NLP_DELAY_TMO)) {
                        ndlp->nlp_prev_state = NLP_STE_NPR_NODE;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
                        lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0);
                }
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prli_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                       void *arg, uint32_t evt)
{
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;
        struct ls_rjt     stat;

        memset(&stat, 0, sizeof (struct ls_rjt));
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);

        if (!(ndlp->nlp_flag & NLP_DELAY_TMO)) {
                if (ndlp->nlp_flag & NLP_NPR_ADISC) {
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag &= ~NLP_NPR_ADISC;
                        ndlp->nlp_prev_state = NLP_STE_NPR_NODE;
                        spin_unlock_irq(shost->host_lock);
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_ADISC_ISSUE);
                        lpfc_issue_els_adisc(vport, ndlp, 0);
                } else {
                        ndlp->nlp_prev_state = NLP_STE_NPR_NODE;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
                        lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0);
                }
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_logo_npr_node(struct lpfc_vport *vport,  struct lpfc_nodelist *ndlp,
                       void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_LOGO);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_padisc_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        lpfc_rcv_padisc(vport, ndlp, cmdiocb);
        /*
         * Do not start discovery if discovery is about to start
         * or discovery in progress for this node. Starting discovery
         * here will affect the counting of discovery threads.
         */
        if (!(ndlp->nlp_flag & NLP_DELAY_TMO) &&
            !(ndlp->nlp_flag & NLP_NPR_2B_DISC)) {
                if (ndlp->nlp_flag & NLP_NPR_ADISC) {
                        ndlp->nlp_flag &= ~NLP_NPR_ADISC;
                        ndlp->nlp_prev_state = NLP_STE_NPR_NODE;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_ADISC_ISSUE);
                        lpfc_issue_els_adisc(vport, ndlp, 0);
                } else {
                        ndlp->nlp_prev_state = NLP_STE_NPR_NODE;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
                        lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0);
                }
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_rcv_prlo_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                       void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_iocbq *cmdiocb = (struct lpfc_iocbq *) arg;

        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_LOGO_ACC;
        spin_unlock_irq(shost->host_lock);

        lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);

        if ((ndlp->nlp_flag & NLP_DELAY_TMO) == 0) {
                mod_timer(&ndlp->nlp_delayfunc,
                          jiffies + msecs_to_jiffies(1000 * 1));
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_DELAY_TMO;
                ndlp->nlp_flag &= ~NLP_NPR_ADISC;
                spin_unlock_irq(shost->host_lock);
                ndlp->nlp_last_elscmd = ELS_CMD_PLOGI;
        } else {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_NPR_ADISC;
                spin_unlock_irq(shost->host_lock);
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_plogi_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb, *rspiocb;
        IOCB_t *irsp;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        cmdiocb = (struct lpfc_iocbq *) arg;
        rspiocb = cmdiocb->context_un.rsp_iocb;

        irsp = &rspiocb->iocb;
        if (irsp->ulpStatus) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_DEFER_RM;
                spin_unlock_irq(shost->host_lock);
                return NLP_STE_FREED_NODE;
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_prli_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                        void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb, *rspiocb;
        IOCB_t *irsp;

        cmdiocb = (struct lpfc_iocbq *) arg;
        rspiocb = cmdiocb->context_un.rsp_iocb;

        irsp = &rspiocb->iocb;
        if (irsp->ulpStatus && (ndlp->nlp_flag & NLP_NODEV_REMOVE)) {
                lpfc_drop_node(vport, ndlp);
                return NLP_STE_FREED_NODE;
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_logo_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                        void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        /* For the fabric port just clear the fc flags. */
        if (ndlp->nlp_DID == Fabric_DID) {
                spin_lock_irq(shost->host_lock);
                vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
                spin_unlock_irq(shost->host_lock);
        }
        lpfc_unreg_rpi(vport, ndlp);
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_adisc_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
{
        struct lpfc_iocbq *cmdiocb, *rspiocb;
        IOCB_t *irsp;

        cmdiocb = (struct lpfc_iocbq *) arg;
        rspiocb = cmdiocb->context_un.rsp_iocb;

        irsp = &rspiocb->iocb;
        if (irsp->ulpStatus && (ndlp->nlp_flag & NLP_NODEV_REMOVE)) {
                lpfc_drop_node(vport, ndlp);
                return NLP_STE_FREED_NODE;
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_cmpl_reglogin_npr_node(struct lpfc_vport *vport,
                            struct lpfc_nodelist *ndlp,
                            void *arg, uint32_t evt)
{
        LPFC_MBOXQ_t *pmb = (LPFC_MBOXQ_t *) arg;
        MAILBOX_t    *mb = &pmb->u.mb;

        if (!mb->mbxStatus) {
                /* SLI4 ports have preallocated logical rpis. */
                if (vport->phba->sli_rev < LPFC_SLI_REV4)
                        ndlp->nlp_rpi = mb->un.varWords[0];
                ndlp->nlp_flag |= NLP_RPI_REGISTERED;
                if (ndlp->nlp_flag & NLP_LOGO_ACC) {
                        lpfc_unreg_rpi(vport, ndlp);
                }
        } else {
                if (ndlp->nlp_flag & NLP_NODEV_REMOVE) {
                        lpfc_drop_node(vport, ndlp);
                        return NLP_STE_FREED_NODE;
                }
        }
        return ndlp->nlp_state;
}

static uint32_t
lpfc_device_rm_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                        void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (ndlp->nlp_flag & NLP_NPR_2B_DISC) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NODEV_REMOVE;
                spin_unlock_irq(shost->host_lock);
                return ndlp->nlp_state;
        }
        lpfc_drop_node(vport, ndlp);
        return NLP_STE_FREED_NODE;
}

static uint32_t
lpfc_device_recov_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           void *arg, uint32_t evt)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        /* Don't do anything that will mess up processing of the
         * previous RSCN.
         */
        if (vport->fc_flag & FC_RSCN_DEFERRED)
                return ndlp->nlp_state;

        lpfc_cancel_retry_delay_tmo(vport, ndlp);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
        ndlp->nlp_fc4_type &= ~(NLP_FC4_FCP | NLP_FC4_NVME);
        spin_unlock_irq(shost->host_lock);
        return ndlp->nlp_state;
}


/* This next section defines the NPort Discovery State Machine */

/* There are 4 different double linked lists nodelist entries can reside on.
 * The plogi list and adisc list are used when Link Up discovery or RSCN
 * processing is needed. Each list holds the nodes that we will send PLOGI
 * or ADISC on. These lists will keep track of what nodes will be effected
 * by an RSCN, or a Link Up (Typically, all nodes are effected on Link Up).
 * The unmapped_list will contain all nodes that we have successfully logged
 * into at the Fibre Channel level. The mapped_list will contain all nodes
 * that are mapped FCP targets.
 */
/*
 * The bind list is a list of undiscovered (potentially non-existent) nodes
 * that we have saved binding information on. This information is used when
 * nodes transition from the unmapped to the mapped list.
 */
/* For UNUSED_NODE state, the node has just been allocated .
 * For PLOGI_ISSUE and REG_LOGIN_ISSUE, the node is on
 * the PLOGI list. For REG_LOGIN_COMPL, the node is taken off the PLOGI list
 * and put on the unmapped list. For ADISC processing, the node is taken off
 * the ADISC list and placed on either the mapped or unmapped list (depending
 * on its previous state). Once on the unmapped list, a PRLI is issued and the
 * state changed to PRLI_ISSUE. When the PRLI completion occurs, the state is
 * changed to UNMAPPED_NODE. If the completion indicates a mapped
 * node, the node is taken off the unmapped list. The binding list is checked
 * for a valid binding, or a binding is automatically assigned. If binding
 * assignment is unsuccessful, the node is left on the unmapped list. If
 * binding assignment is successful, the associated binding list entry (if
 * any) is removed, and the node is placed on the mapped list.
 */
/*
 * For a Link Down, all nodes on the ADISC, PLOGI, unmapped or mapped
 * lists will receive a DEVICE_RECOVERY event. If the linkdown or devloss timers
 * expire, all effected nodes will receive a DEVICE_RM event.
 */
/*
 * For a Link Up or RSCN, all nodes will move from the mapped / unmapped lists
 * to either the ADISC or PLOGI list.  After a Nameserver query or ALPA loopmap
 * check, additional nodes may be added or removed (via DEVICE_RM) to / from
 * the PLOGI or ADISC lists. Once the PLOGI and ADISC lists are populated,
 * we will first process the ADISC list.  32 entries are processed initially and
 * ADISC is initited for each one.  Completions / Events for each node are
 * funnelled thru the state machine.  As each node finishes ADISC processing, it
 * starts ADISC for any nodes waiting for ADISC processing. If no nodes are
 * waiting, and the ADISC list count is identically 0, then we are done. For
 * Link Up discovery, since all nodes on the PLOGI list are UNREG_LOGIN'ed, we
 * can issue a CLEAR_LA and reenable Link Events. Next we will process the PLOGI
 * list.  32 entries are processed initially and PLOGI is initited for each one.
 * Completions / Events for each node are funnelled thru the state machine.  As
 * each node finishes PLOGI processing, it starts PLOGI for any nodes waiting
 * for PLOGI processing. If no nodes are waiting, and the PLOGI list count is
 * indentically 0, then we are done. We have now completed discovery / RSCN
 * handling. Upon completion, ALL nodes should be on either the mapped or
 * unmapped lists.
 */

static uint32_t (*lpfc_disc_action[NLP_STE_MAX_STATE * NLP_EVT_MAX_EVENT])
     (struct lpfc_vport *, struct lpfc_nodelist *, void *, uint32_t) = {
        /* Action routine                  Event       Current State  */
        lpfc_rcv_plogi_unused_node,     /* RCV_PLOGI   UNUSED_NODE    */
        lpfc_rcv_els_unused_node,       /* RCV_PRLI        */
        lpfc_rcv_logo_unused_node,      /* RCV_LOGO        */
        lpfc_rcv_els_unused_node,       /* RCV_ADISC       */
        lpfc_rcv_els_unused_node,       /* RCV_PDISC       */
        lpfc_rcv_els_unused_node,       /* RCV_PRLO        */
        lpfc_disc_illegal,              /* CMPL_PLOGI      */
        lpfc_disc_illegal,              /* CMPL_PRLI       */
        lpfc_cmpl_logo_unused_node,     /* CMPL_LOGO       */
        lpfc_disc_illegal,              /* CMPL_ADISC      */
        lpfc_disc_illegal,              /* CMPL_REG_LOGIN  */
        lpfc_device_rm_unused_node,     /* DEVICE_RM       */
        lpfc_device_recov_unused_node,  /* DEVICE_RECOVERY */