OpenCloudOS-Kernel/drivers/scsi/lpfc/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 (wwn_to_u64(sp->portName.u.wwn) == 0) {
		lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
				 "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_ELS,
				 "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;
	}
	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);
		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;
	}

	/* If the remote NPort logs into us, before we can initiate
	 * discovery to them, cleanup the NPort from discovery accordingly.
	 */
	if (ndlp->nlp_state == NLP_STE_NPR_NODE) {
		spin_lock_irq(shost->host_lock);
		ndlp->nlp_flag &= ~NLP_DELAY_TMO;
		spin_unlock_irq(shost->host_lock);
		del_timer_sync(&ndlp->nlp_delayfunc);
		ndlp->nlp_last_elscmd = 0;

		if (!list_empty(&ndlp->els_retry_evt.evt_listp))
			list_del_init(&ndlp->els_retry_evt.evt_listp);

		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) {
				/* Check to see if there are more
				 * PLOGIs to be sent
				 */
				lpfc_more_plogi(vport);

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

	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);

	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;
}

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_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)) {
		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_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 (wwn_to_u64(sp->portName.u.wwn) == 0 ||
	    wwn_to_u64(sp->nodeName.u.wwn) == 0) {
		lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
				 "0142 PLOGI RSP: Invalid WWN.\n");
		goto out;
	}
	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_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");
	}

	ndlp->nlp_flag |= NLP_DEFER_RM;
	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_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 + 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_NPR_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) {
		ndlp->nlp_flag |= NLP_DEFER_RM;
		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_cmpl_plogi_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_cmpl_plogi_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;
}