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lpfc_nportdisc.c

 /*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2007 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/interrupt.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_fc.h>

#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_vport.h"
#include "lpfc_debugfs.h"


/* 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)
{
      /* 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)
{
      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) {
            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) {
            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) {
            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_DISCOVERY,
                   "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".
 */
int
lpfc_els_abort(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp)
{
      LIST_HEAD(completions);
      struct lpfc_sli  *psli = &phba->sli;
      struct lpfc_sli_ring *pring = &psli->ring[LPFC_ELS_RING];
      struct lpfc_iocbq *iocb, *next_iocb;
      IOCB_t *cmd;

      /* Abort outstanding I/O on NPort <nlp_DID> */
      lpfc_printf_vlog(ndlp->vport, KERN_INFO, LOG_DISCOVERY,
                   "0205 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);

      lpfc_fabric_abort_nport(ndlp);

      /* First check the txq */
      spin_lock_irq(&phba->hbalock);
      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)) {
                  /* It matches, so deque and call compl with anp error */
                  list_move_tail(&iocb->list, &completions);
                  pring->txq_cnt--;
            }
      }

      /* Next check the txcmplq */
      list_for_each_entry_safe(iocb, next_iocb, &pring->txcmplq, list) {
            /* Check to see if iocb matches the nport we are looking for */
            if (lpfc_check_sli_ndlp(phba, pring, iocb, ndlp)) {
                  lpfc_sli_issue_abort_iotag(phba, pring, iocb);
            }
      }
      spin_unlock_irq(&phba->hbalock);

      while (!list_empty(&completions)) {
            iocb = list_get_first(&completions, struct lpfc_iocbq, list);
            cmd = &iocb->iocb;
            list_del_init(&iocb->list);

            if (!iocb->iocb_cmpl)
                  lpfc_sli_release_iocbq(phba, iocb);
            else {
                  cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
                  cmd->un.ulpWord[4] = IOERR_SLI_ABORTED;
                  (iocb->iocb_cmpl) (phba, iocb, iocb);
            }
      }

      /* If we are delaying issuing an ELS command, cancel it */
      if (ndlp->nlp_flag & NLP_DELAY_TMO)
            lpfc_cancel_retry_delay_tmo(phba->pport, ndlp);
      return 0;
}

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;
      uint32_t *lp;
      IOCB_t *icmd;
      struct serv_parm *sp;
      LPFC_MBOXQ_t *mbox;
      struct ls_rjt stat;
      int rc;

      memset(&stat, 0, sizeof (struct ls_rjt));
      if (vport->port_state <= LPFC_FLOGI) {
            /* Before responding to PLOGI, check for pt2pt mode.
             * If we are pt2pt, with an outstanding FLOGI, abort
             * the FLOGI and resend it first.
             */
            if (vport->fc_flag & FC_PT2PT) {
                   lpfc_els_abort_flogi(phba);
                    if (!(vport->fc_flag & FC_PT2PT_PLOGI)) {
                        /* If the other side is supposed to initiate
                         * the PLOGI anyway, just ACC it now and
                         * move on with discovery.
                         */
                        phba->fc_edtov = FF_DEF_EDTOV;
                        phba->fc_ratov = FF_DEF_RATOV;
                        /* Start discovery - this should just do
                           CLEAR_LA */
                        lpfc_disc_start(vport);
                  } else
                        lpfc_initial_flogi(vport);
            } else {
                  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 0;
            }
      }
      pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
      lp = (uint32_t *) pcmd->virt;
      sp = (struct serv_parm *) ((uint8_t *) lp + sizeof (uint32_t));
      if ((lpfc_check_sparm(vport, ndlp, sp, CLASS3) == 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\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;

      /* no need to reg_login if we are already in one of these states */
      switch (ndlp->nlp_state) {
      case  NLP_STE_NPR_NODE:
            if (!(ndlp->nlp_flag & NLP_NPR_ADISC))
                  break;
      case  NLP_STE_REG_LOGIN_ISSUE:
      case  NLP_STE_PRLI_ISSUE:
      case  NLP_STE_UNMAPPED_NODE:
      case  NLP_STE_MAPPED_NODE:
            lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, cmdiocb, ndlp, NULL);
            return 1;
      }

      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;
            mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
            if (mbox == NULL)
                  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 | MBX_STOP_IOCB));
            if (rc == MBX_NOT_FINISHED) {
                  mempool_free(mbox, phba->mbox_mem_pool);
                  goto out;
            }

            lpfc_can_disctmo(vport);
      }
      mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
      if (!mbox)
            goto out;

      rc = lpfc_reg_login(phba, vport->vpi, icmd->un.rcvels.remoteID,
                      (uint8_t *) sp, mbox, 0);
      if (rc) {
            mempool_free(mbox, phba->mbox_mem_pool);
            goto out;
      }

      /* ACC PLOGI rsp command needs to execute first,
       * queue this mbox command to be processed later.
       */
      mbox->mbox_cmpl = lpfc_mbx_cmpl_reg_login;
      /*
       * mbox->context2 = lpfc_nlp_get(ndlp) deferred until mailbox
       * command issued in lpfc_cmpl_els_acc().
       */
      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.
       */
      if (ndlp->nlp_state == NLP_STE_PLOGI_ISSUE) {
            /* software abort outstanding PLOGI */
            lpfc_els_abort(phba, ndlp);
      }

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

            /* 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;
            lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb,
                  ndlp, mbox);
            return 1;
      }
      lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, cmdiocb, ndlp, mbox);
      return 1;

out:
      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;
}

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_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)) {
            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);
            }
            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 + HZ);

      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);

      /* 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);

      if (!(ndlp->nlp_type & NLP_FABRIC) ||
          (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 + HZ * 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 = ndlp->nlp_state;
            lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
      } else {
            ndlp->nlp_prev_state = ndlp->nlp_state;
            lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNUSED_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 void
lpfc_rcv_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
            struct lpfc_iocbq *cmdiocb)
{
      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));

      ndlp->nlp_type &= ~(NLP_FCP_TARGET | NLP_FCP_INITIATOR);
      ndlp->nlp_fcp_info &= ~NLP_FCP_2_DEVICE;
      if (npr->prliType == PRLI_FCP_TYPE) {
            if (npr->initiatorFunc)
                  ndlp->nlp_type |= NLP_FCP_INITIATOR;
            if (npr->targetFunc)
                  ndlp->nlp_type |= NLP_FCP_TARGET;
            if (npr->Retry)
                  ndlp->nlp_fcp_info |= NLP_FCP_2_DEVICE;
      }
      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);

            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_rpi) {
            ndlp->nlp_flag &= ~NLP_NPR_ADISC;
            return 0;
      }

      /* 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) {
            spin_lock_irq(shost->host_lock);
            ndlp->nlp_flag |= NLP_NPR_ADISC;
            spin_unlock_irq(shost->host_lock);
            return 1;
      }
      ndlp->nlp_flag &= ~NLP_NPR_ADISC;
      lpfc_unreg_rpi(vport, ndlp);
      return 0;
}

static uint32_t
lpfc_disc_illegal(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
              void *arg, uint32_t evt)
{
      lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
                   "0253 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)) {
            ndlp->nlp_prev_state = NLP_STE_UNUSED_NODE;
            lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNUSED_NODE);
            return ndlp->nlp_state;
      }
      lpfc_drop_node(vport, ndlp);
      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);
      lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNUSED_NODE);
      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);
      lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNUSED_NODE);

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

static uint32_t
lpfc_rcv_plogi_plogi_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     void *arg, uint32_t evt)
{
      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 {
            lpfc_rcv_plogi(vport, ndlp, cmdiocb);
      } /* 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;

                        /* 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 + HZ * 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 lpfc_iocbq  *cmdiocb, *rspiocb;
      struct lpfc_dmabuf *pcmd, *prsp, *mp;
      uint32_t *lp;
      IOCB_t *irsp;
      struct serv_parm *sp;
      LPFC_MBOXQ_t *mbox;

      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);

      lp = (uint32_t *) prsp->virt;
      sp = (struct serv_parm *) ((uint8_t *) lp + sizeof (uint32_t));
      if (!lpfc_check_sparm(vport, ndlp, sp, CLASS3))
            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;

      mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
      if (!mbox) {
            lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                  "0133 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;
      }

      lpfc_unreg_rpi(vport, ndlp);

      if (lpfc_reg_login(phba, vport->vpi, irsp->un.elsreq64.remoteID,
                     (uint8_t *) sp, mbox, 0) == 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:
                  mbox->mbox_cmpl = lpfc_mbx_cmpl_reg_login;
            }
            mbox->context2 = lpfc_nlp_get(ndlp);
            mbox->vport = vport;
            if (lpfc_sli_issue_mbox(phba, mbox,
                              (MBX_NOWAIT | MBX_STOP_IOCB))
                != MBX_NOT_FINISHED) {
                  lpfc_nlp_set_state(vport, ndlp,
                                 NLP_STE_REG_LOGIN_ISSUE);
                  return ndlp->nlp_state;
            }
            lpfc_nlp_put(ndlp);
            mp = (struct lpfc_dmabuf *) mbox->context1;
            lpfc_mbuf_free(phba, mp->virt, mp->phys);
            kfree(mp);
            mempool_free(mbox, phba->mbox_mem_pool);

            lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                         "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_ELS,
                         "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_ELS,
                         "0261 Cannot Register NameServer login\n");
      }

      /* Free this node since the driver cannot login or has the wrong
         sparm */
      lpfc_drop_node(vport, ndlp);
      return NLP_STE_FREED_NODE;
}

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 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))
            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;

      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;

      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 + HZ);
            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 (ndlp->nlp_type & NLP_FCP_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;

      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;

      cmdiocb = (struct lpfc_iocbq *) arg;

      /* cleanup any ndlp on mbox q waiting for reglogin cmpl */
      if ((mb = phba->sli.mbox_active)) {
            if ((mb->mb.mbxCommand == MBX_REG_LOGIN64) &&
               (ndlp == (struct lpfc_nodelist *) mb->context2)) {
                  lpfc_nlp_put(ndlp);
                  mb->context2 = 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->mb.mbxCommand == MBX_REG_LOGIN64) &&
               (ndlp == (struct lpfc_nodelist *) mb->context2)) {
                  mp = (struct lpfc_dmabuf *) (mb->context1);
                  if (mp) {
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                  }
                  lpfc_nlp_put(ndlp);
                  list_del(&mb->list);
                  mempool_free(mb, phba->mbox_mem_pool);
            }
      }
      spin_unlock_irq(&phba->hbalock);

      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);
      LPFC_MBOXQ_t *pmb = (LPFC_MBOXQ_t *) arg;
      MAILBOX_t *mb = &pmb->mb;
      uint32_t did  = mb->un.varWords[1];

      if (mb->mbxStatus) {
            /* RegLogin failed */
            lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
                        "0246 RegLogin failed Data: x%x x%x x%x\n",
                        did, mb->mbxStatus, vport->port_state);
            /*
             * 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_UNUSED_NODE;
                  lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNUSED_NODE);
                  return ndlp->nlp_state;
            }

            /* Put ndlp in npr state set plogi timer for 1 sec */
            mod_timer(&ndlp->nlp_delayfunc, jiffies + HZ * 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;
      }

      ndlp->nlp_rpi = mb->un.varWords[0];

      /* Only if we are not a fabric nport do we issue PRLI */
      if (!(ndlp->nlp_type & NLP_FABRIC)) {
            ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;
            lpfc_nlp_set_state(vport, ndlp, NLP_STE_PRLI_ISSUE);
            lpfc_issue_els_prli(vport, ndlp, 0);
      } else {
            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);
      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;

      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;

      cmdiocb = (struct lpfc_iocbq *) arg;
      rspiocb = cmdiocb->context_un.rsp_iocb;
      npr = (PRLI *)lpfc_check_elscmpl_iocb(phba, cmdiocb, rspiocb);

      irsp = &rspiocb->iocb;
      if (irsp->ulpStatus) {
            if ((vport->port_type == LPFC_NPIV_PORT) &&
                vport->cfg_restrict_login) {
                  goto out;
            }
            ndlp->nlp_prev_state = NLP_STE_PRLI_ISSUE;
            lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
            return ndlp->nlp_state;
      }

      /* Check out PRLI rsp */
      ndlp->nlp_type &= ~(NLP_FCP_TARGET | NLP_FCP_INITIATOR);
      ndlp->nlp_fcp_info &= ~NLP_FCP_2_DEVICE;
      if ((npr->acceptRspCode == PRLI_REQ_EXECUTED) &&
          (npr->prliType == PRLI_FCP_TYPE)) {
            if (npr->initiatorFunc)
                  ndlp->nlp_type |= NLP_FCP_INITIATOR;
            if (npr->targetFunc)
                  ndlp->nlp_type |= NLP_FCP_TARGET;
            if (npr->Retry)
                  ndlp->nlp_fcp_info |= NLP_FCP_2_DEVICE;
      }
      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_UNUSED_NODE);
            return ndlp->nlp_state;
      }

      ndlp->nlp_prev_state = NLP_STE_PRLI_ISSUE;
      if (ndlp->nlp_type & NLP_FCP_TARGET)
            lpfc_nlp_set_state(vport, ndlp, NLP_STE_MAPPED_NODE);
      else
            lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
      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_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;

      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);
      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;

      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.ring[phba->sli.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);
      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)) {
            spin_lock_irq(shost->host_lock);
            ndlp->nlp_flag &= ~NLP_NPR_ADISC;
            spin_unlock_irq(shost->host_lock);
            return ndlp->nlp_state;
      }

      /* 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 + HZ * 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;

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

      irsp = &rspiocb->iocb;
      if (irsp->ulpStatus) {
            lpfc_drop_node(vport, ndlp);
            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)
{
      lpfc_unreg_rpi(vport, ndlp);
      /* This routine does nothing, just return the current state */
      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->mb;

      if (!mb->mbxStatus)
            ndlp->nlp_rpi = mb->un.varWords[0];
      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;

      spin_lock_irq(shost->host_lock);
      ndlp->nlp_flag &= ~(NLP_NODEV_REMOVE | NLP_NPR_2B_DISC);
      spin_unlock_irq(shost->host_lock);
      if (ndlp->nlp_flag & NLP_DELAY_TMO) {
            lpfc_cancel_retry_delay_tmo(vport, ndlp);
      }
      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_disc_illegal,            /* DEVICE_RECOVERY */

      lpfc_rcv_plogi_plogi_issue,   /* RCV_PLOGI   PLOGI_ISSUE    */
      lpfc_rcv_prli_plogi_issue,    /* RCV_PRLI        */
      lpfc_rcv_logo_plogi_issue,    /* RCV_LOGO        */
      lpfc_rcv_els_plogi_issue,     /* RCV_ADISC       */
      lpfc_rcv_els_plogi_issue,     /* RCV_PDISC       */
      lpfc_rcv_els_plogi_issue,     /* RCV_PRLO        */
      lpfc_cmpl_plogi_plogi_issue,  /* CMPL_PLOGI      */
      lpfc_disc_illegal,            /* CMPL_PRLI       */
      lpfc_disc_illegal,            /* CMPL_LOGO       */
      lpfc_disc_illegal,            /* CMPL_ADISC      */
      lpfc_disc_illegal,            /* CMPL_REG_LOGIN  */
      lpfc_device_rm_plogi_issue,   /* DEVICE_RM       */
      lpfc_device_recov_plogi_issue,      /* DEVICE_RECOVERY */

      lpfc_rcv_plogi_adisc_issue,   /* RCV_PLOGI   ADISC_ISSUE    */
      lpfc_rcv_prli_adisc_issue,    /* RCV_PRLI        */
      lpfc_rcv_logo_adisc_issue,    /* RCV_LOGO        */
      lpfc_rcv_padisc_adisc_issue,  /* RCV_ADISC       */
      lpfc_rcv_padisc_adisc_issue,  /* RCV_PDISC       */
      lpfc_rcv_prlo_adisc_issue,    /* RCV_PRLO        */
      lpfc_disc_illegal,            /* CMPL_PLOGI      */
      lpfc_disc_illegal,            /* CMPL_PRLI       */
      lpfc_disc_illegal,            /* CMPL_LOGO       */
      lpfc_cmpl_adisc_adisc_issue,  /* CMPL_ADISC      */
      lpfc_disc_illegal,            /* CMPL_REG_LOGIN  */
      lpfc_device_rm_adisc_issue,   /* DEVICE_RM       */
      lpfc_device_recov_adisc_issue,      /* DEVICE_RECOVERY */

      lpfc_rcv_plogi_reglogin_issue,      /* RCV_PLOGI  REG_LOGIN_ISSUE */
      lpfc_rcv_prli_reglogin_issue, /* RCV_PLOGI       */
      lpfc_rcv_logo_reglogin_issue, /* RCV_LOGO        */
      lpfc_rcv_padisc_reglogin_issue,     /* RCV_ADISC       */
      lpfc_rcv_padisc_reglogin_issue,     /* RCV_PDISC       */
      lpfc_rcv_prlo_reglogin_issue, /* RCV_PRLO        */
      lpfc_disc_illegal,            /* CMPL_PLOGI      */
      lpfc_disc_illegal,            /* CMPL_PRLI       */
      lpfc_disc_illegal,            /* CMPL_LOGO       */
      lpfc_disc_illegal,            /* CMPL_ADISC      */
      lpfc_cmpl_reglogin_reglogin_issue,/* CMPL_REG_LOGIN  */
      lpfc_device_rm_reglogin_issue,      /* DEVICE_RM       */
      lpfc_device_recov_reglogin_issue,/* DEVICE_RECOVERY */

      lpfc_rcv_plogi_prli_issue,    /* RCV_PLOGI   PRLI_ISSUE     */
      lpfc_rcv_prli_prli_issue,     /* RCV_PRLI        */
      lpfc_rcv_logo_prli_issue,     /* RCV_LOGO        */
      lpfc_rcv_padisc_prli_issue,   /* RCV_ADISC       */
      lpfc_rcv_padisc_prli_issue,   /* RCV_PDISC       */
      lpfc_rcv_prlo_prli_issue,     /* RCV_PRLO        */
      lpfc_disc_illegal,            /* CMPL_PLOGI      */
      lpfc_cmpl_prli_prli_issue,    /* CMPL_PRLI       */
      lpfc_disc_illegal,            /* CMPL_LOGO       */
      lpfc_disc_illegal,            /* CMPL_ADISC      */
      lpfc_disc_illegal,            /* CMPL_REG_LOGIN  */
      lpfc_device_rm_prli_issue,    /* DEVICE_RM       */
      lpfc_device_recov_prli_issue, /* DEVICE_RECOVERY */

      lpfc_rcv_plogi_unmap_node,    /* RCV_PLOGI   UNMAPPED_NODE  */
      lpfc_rcv_prli_unmap_node,     /* RCV_PRLI        */
      lpfc_rcv_logo_unmap_node,     /* RCV_LOGO        */
      lpfc_rcv_padisc_unmap_node,   /* RCV_ADISC       */
      lpfc_rcv_padisc_unmap_node,   /* RCV_PDISC       */
      lpfc_rcv_prlo_unmap_node,     /* RCV_PRLO        */
      lpfc_disc_illegal,            /* CMPL_PLOGI      */
      lpfc_disc_illegal,            /* CMPL_PRLI       */
      lpfc_disc_illegal,            /* CMPL_LOGO       */
      lpfc_disc_illegal,            /* CMPL_ADISC      */
      lpfc_disc_illegal,            /* CMPL_REG_LOGIN  */
      lpfc_disc_illegal,            /* DEVICE_RM       */
      lpfc_device_recov_unmap_node, /* DEVICE_RECOVERY */

      lpfc_rcv_plogi_mapped_node,   /* RCV_PLOGI   MAPPED_NODE    */
      lpfc_rcv_prli_mapped_node,    /* RCV_PRLI        */
      lpfc_rcv_logo_mapped_node,    /* RCV_LOGO        */
      lpfc_rcv_padisc_mapped_node,  /* RCV_ADISC       */
      lpfc_rcv_padisc_mapped_node,  /* RCV_PDISC       */
      lpfc_rcv_prlo_mapped_node,    /* RCV_PRLO        */
      lpfc_disc_illegal,            /* CMPL_PLOGI      */
      lpfc_disc_illegal,            /* CMPL_PRLI       */
      lpfc_disc_illegal,            /* CMPL_LOGO       */
      lpfc_disc_illegal,            /* CMPL_ADISC      */
      lpfc_disc_illegal,            /* CMPL_REG_LOGIN  */
      lpfc_disc_illegal,            /* DEVICE_RM       */
      lpfc_device_recov_mapped_node,      /* DEVICE_RECOVERY */

      lpfc_rcv_plogi_npr_node,        /* RCV_PLOGI   NPR_NODE    */
      lpfc_rcv_prli_npr_node,         /* RCV_PRLI        */
      lpfc_rcv_logo_npr_node,         /* RCV_LOGO        */
      lpfc_rcv_padisc_npr_node,       /* RCV_ADISC       */
      lpfc_rcv_padisc_npr_node,       /* RCV_PDISC       */
      lpfc_rcv_prlo_npr_node,         /* RCV_PRLO        */
      lpfc_cmpl_plogi_npr_node,     /* CMPL_PLOGI      */
      lpfc_cmpl_prli_npr_node,      /* CMPL_PRLI       */
      lpfc_cmpl_logo_npr_node,        /* CMPL_LOGO       */
      lpfc_cmpl_adisc_npr_node,       /* CMPL_ADISC      */
      lpfc_cmpl_reglogin_npr_node,    /* CMPL_REG_LOGIN  */
      lpfc_device_rm_npr_node,        /* DEVICE_RM       */
      lpfc_device_recov_npr_node,     /* DEVICE_RECOVERY */
};

int
lpfc_disc_state_machine(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                  void *arg, uint32_t evt)
{
      uint32_t cur_state, rc;
      uint32_t(*func) (struct lpfc_vport *, struct lpfc_nodelist *, void *,
                   uint32_t);

      lpfc_nlp_get(ndlp);
      cur_state = ndlp->nlp_state;

      /* DSM in event <evt> on NPort <nlp_DID> in state <cur_state> */
      lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                   "0211 DSM in event x%x on NPort x%x in "
                   "state %d Data: x%x\n",
                   evt, ndlp->nlp_DID, cur_state, ndlp->nlp_flag);

      lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_DSM,
             "DSM in:          evt:%d ste:%d did:x%x",
            evt, cur_state, ndlp->nlp_DID);

      func = lpfc_disc_action[(cur_state * NLP_EVT_MAX_EVENT) + evt];
      rc = (func) (vport, ndlp, arg, evt);

      /* DSM out state <rc> on NPort <nlp_DID> */
      lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                   "0212 DSM out state %d on NPort x%x Data: x%x\n",
                   rc, ndlp->nlp_DID, ndlp->nlp_flag);

      lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_DSM,
             "DSM out:         ste:%d did:x%x flg:x%x",
            rc, ndlp->nlp_DID, ndlp->nlp_flag);

      lpfc_nlp_put(ndlp);

      return rc;
}

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