drivers/scsi/lpfc/lpfc_els.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2015 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/
/* See Fibre Channel protocol T11 FC-LS for details */
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.h>

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


#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_vport.h"
#include "lpfc_debugfs.h"

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

static int lpfc_max_els_tries = 3;

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

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

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

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

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

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

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

	return 1;
}

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


	if (!lpfc_is_link_up(phba))
		return NULL;

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

	if (elsiocb == NULL)
		return NULL;

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

	icmd = &elsiocb->iocb;

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

	INIT_LIST_HEAD(&pcmd->list);

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

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

	INIT_LIST_HEAD(&pbuflist->list);

	if (expectRsp) {
		icmd->un.elsreq64.bdl.addrHigh = putPaddrHigh(pbuflist->phys);
		icmd->un.elsreq64.bdl.addrLow = putPaddrLow(pbuflist->phys);
		icmd->un.elsreq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
		icmd->un.elsreq64.bdl.bdeSize = (2 * sizeof(struct ulp_bde64));

		icmd->un.elsreq64.remoteID = did;		/* DID */
		icmd->ulpCommand = CMD_ELS_REQUEST64_CR;
		if (elscmd == ELS_CMD_FLOGI)
			icmd->ulpTimeout = FF_DEF_RATOV * 2;
		else
			icmd->ulpTimeout = phba->fc_ratov * 2;
	} else {
		icmd->un.xseq64.bdl.addrHigh = putPaddrHigh(pbuflist->phys);
		icmd->un.xseq64.bdl.addrLow = putPaddrLow(pbuflist->phys);
		icmd->un.xseq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
		icmd->un.xseq64.bdl.bdeSize = sizeof(struct ulp_bde64);
		icmd->un.xseq64.xmit_els_remoteID = did;	/* DID */
		icmd->ulpCommand = CMD_XMIT_ELS_RSP64_CX;
	}
	icmd->ulpBdeCount = 1;
	icmd->ulpLe = 1;
	icmd->ulpClass = CLASS3;

	/*
	 * If we have NPIV enabled, we want to send ELS traffic by VPI.
	 * For SLI4, since the driver controls VPIs we also want to include
	 * all ELS pt2pt protocol traffic as well.
	 */
	if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) ||
		((phba->sli_rev == LPFC_SLI_REV4) &&
		    (vport->fc_flag & FC_PT2PT))) {

		if (expectRsp) {
			icmd->un.elsreq64.myID = vport->fc_myDID;

			/* For ELS_REQUEST64_CR, use the VPI by default */
			icmd->ulpContext = phba->vpi_ids[vport->vpi];
		}

		icmd->ulpCt_h = 0;
		/* The CT field must be 0=INVALID_RPI for the ECHO cmd */
		if (elscmd == ELS_CMD_ECHO)
			icmd->ulpCt_l = 0; /* context = invalid RPI */
		else
			icmd->ulpCt_l = 1; /* context = VPI */
	}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;

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

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

/**
 * lpfc_issue_reg_vfi - Register VFI for this vport's fabric login
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues a REG_VFI mailbox for the vfi, vpi, fcfi triplet for
 * the @vport. This mailbox command is necessary for SLI4 port only.
 *
 * Return code
 *   0 - successfully issued REG_VFI for @vport
 *   A failure code otherwise.
 **/
int
lpfc_issue_reg_vfi(struct lpfc_vport *vport)
{
	struct lpfc_hba  *phba = vport->phba;
	LPFC_MBOXQ_t *mboxq;
	struct lpfc_nodelist *ndlp;
	struct serv_parm *sp;
	struct lpfc_dmabuf *dmabuf;
	int rc = 0;

	sp = &phba->fc_fabparam;
	/* move forward in case of SLI4 FC port loopback test and pt2pt mode */
	if ((phba->sli_rev == LPFC_SLI_REV4) &&
	    !(phba->link_flag & LS_LOOPBACK_MODE) &&
	    !(vport->fc_flag & FC_PT2PT)) {
		ndlp = lpfc_findnode_did(vport, Fabric_DID);
		if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
			rc = -ENODEV;
			goto fail;
		}
	}

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

	mboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
	if (!mboxq) {
		rc = -ENOMEM;
		goto fail_free_coherent;
	}
	vport->port_state = LPFC_FABRIC_CFG_LINK;
	memcpy(dmabuf->virt, &phba->fc_fabparam, sizeof(vport->fc_sparam));
	lpfc_reg_vfi(mboxq, vport, dmabuf->phys);

	mboxq->mbox_cmpl = lpfc_mbx_cmpl_reg_vfi;
	mboxq->vport = vport;
	mboxq->context1 = dmabuf;
	rc = lpfc_sli_issue_mbox(phba, mboxq, MBX_NOWAIT);
	if (rc == MBX_NOT_FINISHED) {
		rc = -ENXIO;
		goto fail_free_mbox;
	}
	return 0;

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

/**
 * lpfc_issue_unreg_vfi - Unregister VFI for this vport's fabric login
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues a UNREG_VFI mailbox with the vfi, vpi, fcfi triplet for
 * the @vport. This mailbox command is necessary for SLI4 port only.
 *
 * Return code
 *   0 - successfully issued REG_VFI for @vport
 *   A failure code otherwise.
 **/
int
lpfc_issue_unreg_vfi(struct lpfc_vport *vport)
{
	struct lpfc_hba *phba = vport->phba;
	struct Scsi_Host *shost;
	LPFC_MBOXQ_t *mboxq;
	int rc;

	mboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
	if (!mboxq) {
		lpfc_printf_log(phba, KERN_ERR, LOG_DISCOVERY|LOG_MBOX,
				"2556 UNREG_VFI mbox allocation failed"
				"HBA state x%x\n", phba->pport->port_state);
		return -ENOMEM;
	}

	lpfc_unreg_vfi(mboxq, vport);
	mboxq->vport = vport;
	mboxq->mbox_cmpl = lpfc_unregister_vfi_cmpl;

	rc = lpfc_sli_issue_mbox(phba, mboxq, MBX_NOWAIT);
	if (rc == MBX_NOT_FINISHED) {
		lpfc_printf_log(phba, KERN_ERR, LOG_DISCOVERY|LOG_MBOX,
				"2557 UNREG_VFI issue mbox failed rc x%x "
				"HBA state x%x\n",
				rc, phba->pport->port_state);
		mempool_free(mboxq, phba->mbox_mem_pool);
		return -EIO;
	}

	shost = lpfc_shost_from_vport(vport);
	spin_lock_irq(shost->host_lock);
	vport->fc_flag &= ~FC_VFI_REGISTERED;
	spin_unlock_irq(shost->host_lock);
	return 0;
}

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

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

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

	return fabric_param_changed;
}


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

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

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

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

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

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

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

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

	/*
	 * For FC we need to do some special processing because of the SLI
	 * Port's default settings of the Common Service Parameters.
	 */
	if (phba->sli4_hba.lnk_info.lnk_tp == LPFC_LNK_TYPE_FC) {
		/* If physical FC port changed, unreg VFI and ALL VPIs / RPIs */
		if ((phba->sli_rev == LPFC_SLI_REV4) && fabric_param_changed)
			lpfc_unregister_fcf_prep(phba);

		/* This should just update the VFI CSPs*/
		if (vport->fc_flag & FC_VFI_REGISTERED)
			lpfc_issue_reg_vfi(vport);
	}

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

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

		if (phba->sli_rev == LPFC_SLI_REV4) {
			lpfc_sli4_unreg_all_rpis(vport);
			lpfc_mbx_unreg_vpi(vport);
			spin_lock_irq(shost->host_lock);
			vport->fc_flag |= FC_VPORT_NEEDS_INIT_VPI;
			spin_unlock_irq(shost->host_lock);
		}

		/*
		 * For SLI3 and SLI4, the VPI needs to be reregistered in
		 * response to this fabric parameter change event.
		 */
		spin_lock_irq(shost->host_lock);
		vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
		spin_unlock_irq(shost->host_lock);
	} else if ((phba->sli_rev == LPFC_SLI_REV4) &&
		!(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) {
			/*
			 * Driver needs to re-reg VPI in order for f/w
			 * to update the MAC address.
			 */
			lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
			lpfc_register_new_vport(phba, vport, ndlp);
			return 0;
	}

	if (phba->sli_rev < LPFC_SLI_REV4) {
		lpfc_nlp_set_state(vport, ndlp, NLP_STE_REG_LOGIN_ISSUE);
		if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED &&
		    vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)
			lpfc_register_new_vport(phba, vport, ndlp);
		else
			lpfc_issue_fabric_reglogin(vport);
	} else {
		ndlp->nlp_type |= NLP_FABRIC;
		lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
		if ((!(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) &&
			(vport->vpi_state & LPFC_VPI_REGISTERED)) {
			lpfc_start_fdiscs(phba);
			lpfc_do_scr_ns_plogi(phba, vport);
		} else if (vport->fc_flag & FC_VFI_REGISTERED)
			lpfc_issue_init_vpi(vport);
		else {
			lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
					"3135 Need register VFI: (x%x/%x)\n",
					vport->fc_prevDID, vport->fc_myDID);
			lpfc_issue_reg_vfi(vport);
		}
	}
	return 0;
}

/**
 * lpfc_cmpl_els_flogi_nport - Completion function for flogi to an N_Port
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @sp: pointer to service parameter data structure.
 *
 * This routine is invoked by the lpfc_cmpl_els_flogi() completion callback
 * function to handle the completion of a Fabric Login (FLOGI) into an N_Port
 * in a point-to-point topology. First, the @vport's N_Port Name is compared
 * with the received N_Port Name: if the @vport's N_Port Name is greater than
 * the received N_Port Name lexicographically, this node shall assign local
 * N_Port ID (PT2PT_LocalID: 1) and remote N_Port ID (PT2PT_RemoteID: 2) and
 * will send out Port Login (PLOGI) with the N_Port IDs assigned. Otherwise,
 * this node shall just wait for the remote node to issue PLOGI and assign
 * N_Port IDs.
 *
 * Return code
 *   0 - Success
 *   -ENXIO - Fail
 **/
static int
lpfc_cmpl_els_flogi_nport(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
			  struct serv_parm *sp)
{
	struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
	struct lpfc_hba  *phba = vport->phba;
	LPFC_MBOXQ_t *mbox;
	int rc;

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

	phba->fc_edtov = FF_DEF_EDTOV;
	phba->fc_ratov = FF_DEF_RATOV;
	rc = memcmp(&vport->fc_portname, &sp->portName,
		    sizeof(vport->fc_portname));
	memcpy(&phba->fc_fabparam, sp, sizeof(struct serv_parm));

	if (rc >= 0) {
		/* This side will initiate the PLOGI */
		spin_lock_irq(shost->host_lock);
		vport->fc_flag |= FC_PT2PT_PLOGI;
		spin_unlock_irq(shost->host_lock);

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

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

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

		lpfc_config_link(phba, mbox);

		mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
		mbox->vport = vport;
		rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
		if (rc == MBX_NOT_FINISHED) {
			mempool_free(mbox, phba->mbox_mem_pool);
			goto fail;
		}

		/*
		 * For SLI4, the VFI/VPI are registered AFTER the
		 * Nport with the higher WWPN sends the PLOGI with
		 * an assigned NPortId.
		 */

		/* not equal */
		if ((phba->sli_rev == LPFC_SLI_REV4) && rc)
			lpfc_issue_reg_vfi(vport);

		/* Decrement ndlp reference count indicating that ndlp can be
		 * safely released when other references to it are done.
		 */
		lpfc_nlp_put(ndlp);

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

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

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

	spin_lock_irq(shost->host_lock);
	vport->fc_flag |= FC_PT2PT;
	spin_unlock_irq(shost->host_lock);
	/* If physical FC port changed, unreg VFI and ALL VPIs / RPIs */
	if ((phba->sli_rev == LPFC_SLI_REV4) && phba->fc_topology_changed) {
		lpfc_unregister_fcf_prep(phba);

		/* The FC_VFI_REGISTERED flag will get clear in the cmpl
		 * handler for unreg_vfi, but if we don't force the
		 * FC_VFI_REGISTERED flag then the reg_vfi mailbox could be
		 * built with the update bit set instead of just the vp bit to
		 * change the Nport ID.  We need to have the vp set and the
		 * Upd cleared on topology changes.
		 */
		spin_lock_irq(shost->host_lock);
		vport->fc_flag &= ~FC_VFI_REGISTERED;
		spin_unlock_irq(shost->host_lock);
		phba->fc_topology_changed = 0;
		lpfc_issue_reg_vfi(vport);
	}

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

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

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

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

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

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

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

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

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

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

	/*
	 * The FLogI succeeded.  Sync the data for the CPU before
	 * accessing it.
	 */
	prsp = list_get_first(&pcmd->list, struct lpfc_dmabuf, list);
	if (!prsp)
		goto out;
	sp = prsp->virt + sizeof(uint32_t);

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

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

flogifail:
	lpfc_nlp_put(ndlp);

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

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

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

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

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

	if (!elsiocb)
		return 1;

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

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

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

	if  (phba->sli_rev == LPFC_SLI_REV4) {
		if (bf_get(lpfc_sli_intf_if_type, &phba->sli4_hba.sli_intf) ==
		    LPFC_SLI_INTF_IF_TYPE_0) {
			elsiocb->iocb.ulpCt_h = ((SLI4_CT_FCFI >> 1) & 1);
			elsiocb->iocb.ulpCt_l = (SLI4_CT_FCFI & 1);
			/* FLOGI needs to be 3 for WQE FCFI */
			/* Set the fcfi to the fcfi we registered with */
			elsiocb->iocb.ulpContext = phba->fcf.fcfi;
		}
		/* Can't do SLI4 class2 without support sequence coalescing */
		sp->cls2.classValid = 0;
		sp->cls2.seqDelivery = 0;
	} else {
		/* Historical, setting sequential-delivery bit for SLI3 */
		sp->cls2.seqDelivery = (sp->cls2.classValid) ? 1 : 0;
		sp->cls3.seqDelivery = (sp->cls3.classValid) ? 1 : 0;
		if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
			sp->cmn.request_multiple_Nport = 1;
			/* For FLOGI, Let FLOGI rsp set the NPortID for VPI 0 */
			icmd->ulpCt_h = 1;
			icmd->ulpCt_l = 0;
		} else
			sp->cmn.request_multiple_Nport = 0;
	}

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

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

	return;
}

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

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

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

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

	if (new_ndlp == ndlp && NLP_CHK_NODE_ACT(new_ndlp))
		return ndlp;
	if (phba->sli_rev == LPFC_SLI_REV4) {
		active_rrqs_xri_bitmap = mempool_alloc(phba->active_rrq_pool,
						       GFP_KERNEL);
		if (active_rrqs_xri_bitmap)
			memset(active_rrqs_xri_bitmap, 0,
			       phba->cfg_rrq_xri_bitmap_sz);
	}

	lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
		 "3178 PLOGI confirm: ndlp %p x%x: new_ndlp %p\n",
		 ndlp, ndlp->nlp_DID, new_ndlp);

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

	lpfc_unreg_rpi(vport, new_ndlp);
	new_ndlp->nlp_DID = ndlp->nlp_DID;
	new_ndlp->nlp_prev_state = ndlp->nlp_prev_state;
	if (phba->sli_rev == LPFC_SLI_REV4)
		memcpy(new_ndlp->active_rrqs_xri_bitmap,
		       ndlp->active_rrqs_xri_bitmap,
		       phba->cfg_rrq_xri_bitmap_sz);

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

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

	/* Move this back to NPR state */
	if (memcmp(&ndlp->nlp_portname, name, sizeof(struct lpfc_name)) == 0) {
		/* The new_ndlp is replacing ndlp totally, so we need
		 * to put ndlp on UNUSED list and try to free it.
		 */
		lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
			 "3179 PLOGI confirm NEW: %x %x\n",
			 new_ndlp->nlp_DID, keepDID);

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

		/* Two ndlps cannot have the same did on the nodelist */
		ndlp->nlp_DID = keepDID;
		if (phba->sli_rev == LPFC_SLI_REV4 &&
		    active_rrqs_xri_bitmap)
			memcpy(ndlp->active_rrqs_xri_bitmap,
			       active_rrqs_xri_bitmap,
			       phba->cfg_rrq_xri_bitmap_sz);
		lpfc_drop_node(vport, ndlp);
	}
	else {
		lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
			 "3180 PLOGI confirm SWAP: %x %x\n",
			 new_ndlp->nlp_DID, keepDID);

		lpfc_unreg_rpi(vport, ndlp);

		/* Two ndlps cannot have the same did */
		ndlp->nlp_DID = keepDID;
		if (phba->sli_rev == LPFC_SLI_REV4 &&
		    active_rrqs_xri_bitmap)
			memcpy(ndlp->active_rrqs_xri_bitmap,
			       active_rrqs_xri_bitmap,
			       phba->cfg_rrq_xri_bitmap_sz);

		/* Since we are swapping the ndlp passed in with the new one
		 * and the did has already been swapped, copy over state.
		 * The new WWNs are already in new_ndlp since thats what
		 * we looked it up by in the begining of this routine.
		 */
		new_ndlp->nlp_state = ndlp->nlp_state;

		/* Since we are switching over to the new_ndlp, the old
		 * ndlp should be put in the NPR state, unless we have
		 * already started re-discovery on it.
		 */
		if ((ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) ||
		    (ndlp->nlp_state == NLP_STE_MAPPED_NODE))
			lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);

		/* Fix up the rport accordingly */
		rport = ndlp->rport;
		if (rport) {
			rdata = rport->dd_data;
			put_node = rdata->pnode != NULL;
			put_rport = ndlp->rport != NULL;
			rdata->pnode = NULL;
			ndlp->rport = NULL;
			if (put_node)
				lpfc_nlp_put(ndlp);
			if (put_rport)
				put_device(&rport->dev);
		}
	}
	if (phba->sli_rev == LPFC_SLI_REV4 &&
	    active_rrqs_xri_bitmap)
		mempool_free(active_rrqs_xri_bitmap,
			     phba->active_rrq_pool);
	return new_ndlp;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	psli = &phba->sli;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	lpfc_end_rscn(vport);
}

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

	/*
	 * For NPIV, cmpl_reg_vpi will set port_state to READY,
	 * and continue discovery.
	 */
	if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
	    !(vport->fc_flag & FC_RSCN_MODE) &&
	    (phba->sli_rev < LPFC_SLI_REV4)) {
		/* The ADISCs are complete.  Doesn't matter if they
		 * succeeded or failed because the ADISC completion
		 * routine guarantees to call the state machine and
		 * the RPI is either unregistered (failed ADISC response)
		 * or the RPI is still valid and the node is marked
		 * mapped for a target.  The exchanges should be in the
		 * correct state. This code is specific to SLI3.
		 */
		lpfc_issue_clear_la(phba, vport);
		lpfc_issue_reg_vpi(phba, vport);
		return;
	}
	/*
	* For SLI2, we need to set port_state to READY
	* and continue discovery.
	*/
	if (vport->port_state < LPFC_VPORT_READY) {
		/* If we get here, there is nothing to ADISC */
		lpfc_issue_clear_la(phba, vport);
		if (!(vport->fc_flag & FC_ABORT_DISCOVERY)) {
			vport->num_disc_nodes = 0;
			/* go thru NPR list, issue ELS PLOGIs */
			if (vport->fc_npr_cnt)
				lpfc_els_disc_plogi(vport);
			if (!vport->num_disc_nodes) {
				spin_lock_irq(shost->host_lock);
				vport->fc_flag &= ~FC_NDISC_ACTIVE;
				spin_unlock_irq(shost->host_lock);
				lpfc_can_disctmo(vport);
				lpfc_end_rscn(vport);
			}
		}
		vport->port_state = LPFC_VPORT_READY;
	} else
		lpfc_rscn_disc(vport);
}

/**
 * lpfc_more_adisc - Issue more adisc as needed
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine determines whether there are more ndlps on a @vport
 * node list need to have Address Discover (ADISC) issued. If so, it will
 * invoke the lpfc_els_disc_adisc() routine to issue ADISC on the @vport's
 * remaining nodes which need to have ADISC sent.
 **/
void
lpfc_more_adisc(struct lpfc_vport *vport)
{
	if (vport->num_disc_nodes)
		vport->num_disc_nodes--;
	/* Continue discovery with <num_disc_nodes> ADISCs to go */
	lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
			 "0210 Continue discovery with %d ADISCs to go "
			 "Data: x%x x%x x%x\n",
			 vport->num_disc_nodes, vport->fc_adisc_cnt,
			 vport->fc_flag, vport->port_state);
	/* Check to see if there are more ADISCs to be sent */
	if (vport->fc_flag & FC_NLP_MORE) {
		lpfc_set_disctmo(vport);
		/* go thru NPR nodes and issue any remaining ELS ADISCs */
		lpfc_els_disc_adisc(vport);
	}
	if (!vport->num_disc_nodes)
		lpfc_adisc_done(vport);
	return;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/**
 * lpfc_cmpl_els_logo - Completion callback function for logo
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion function for issuing the ELS Logout (LOGO)
 * command. If no error status was reported from the LOGO response, the
 * state machine of the associated ndlp shall be invoked for transition with
 * respect to NLP_EVT_CMPL_LOGO event. Otherwise, if error status was reported,
 * the lpfc_els_retry() routine will be invoked to retry the LOGO command.
 **/
static void
lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
		   struct lpfc_iocbq *rspiocb)
{
	struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
	struct lpfc_vport *vport = ndlp->vport;
	struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
	IOCB_t *irsp;
	struct lpfc_sli *psli;
	struct lpfcMboxq *mbox;
	unsigned long flags;
	uint32_t skip_recovery = 0;

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

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

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

	/* LOGO completes to NPort <nlp_DID> */
	lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
			 "0105 LOGO completes to NPort x%x "
			 "Data: x%x x%x x%x x%x\n",
			 ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
			 irsp->ulpTimeout, vport->num_disc_nodes);

	if (lpfc_els_chk_latt(vport)) {
		skip_recovery = 1;
		goto out;
	}

	/* Check to see if link went down during discovery */
	if (ndlp->nlp_flag & NLP_TARGET_REMOVE) {
	        /* NLP_EVT_DEVICE_RM should unregister the RPI
		 * which should abort all outstanding IOs.
		 */
		lpfc_disc_state_machine(vport, ndlp, cmdiocb,
					NLP_EVT_DEVICE_RM);
		skip_recovery = 1;
		goto out;
	}

	if (irsp->ulpStatus) {
		/* Check for retry */
		if (lpfc_els_retry(phba, cmdiocb, rspiocb)) {
			/* ELS command is being retried */
			skip_recovery = 1;
			goto out;
		}
		/* LOGO failed */
		lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
				 "2756 LOGO failure DID:%06X Status:x%x/x%x\n",
				 ndlp->nlp_DID, irsp->ulpStatus,
				 irsp->un.ulpWord[4]);
		/* Do not call DSM for lpfc_els_abort'ed ELS cmds */
		if (lpfc_error_lost_link(irsp)) {
			skip_recovery = 1;
			goto out;
		}
	}

	/* Call state machine. This will unregister the rpi if needed. */
	lpfc_disc_state_machine(vport, ndlp, cmdiocb, NLP_EVT_CMPL_LOGO);

out:
	lpfc_els_free_iocb(phba, cmdiocb);
	/* If we are in pt2pt mode, we could rcv new S_ID on PLOGI */
	if ((vport->fc_flag & FC_PT2PT) &&
		!(vport->fc_flag & FC_PT2PT_PLOGI)) {
		phba->pport->fc_myDID = 0;
		mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
		if (mbox) {
			lpfc_config_link(phba, mbox);
			mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
			mbox->vport = vport;
			if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT) ==
				MBX_NOT_FINISHED) {
				mempool_free(mbox, phba->mbox_mem_pool);
				skip_recovery = 1;
			}
		}
	}

	/*
	 * If the node is a target, the handling attempts to recover the port.
	 * For any other port type, the rpi is unregistered as an implicit
	 * LOGO.
	 */
	if ((ndlp->nlp_type & NLP_FCP_TARGET) && (skip_recovery == 0)) {
		lpfc_cancel_retry_delay_tmo(vport, ndlp);
		spin_lock_irqsave(shost->host_lock, flags);
		ndlp->nlp_flag |= NLP_NPR_2B_DISC;
		spin_unlock_irqrestore(shost->host_lock, flags);

		lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
				 "3187 LOGO completes to NPort x%x: Start "
				 "Recovery Data: x%x x%x x%x x%x\n",
				 ndlp->nlp_DID, irsp->ulpStatus,
				 irsp->un.ulpWord[4], irsp->ulpTimeout,
				 vport->num_disc_nodes);
		lpfc_disc_start(vport);
	}
	return;
}

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

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

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

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

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

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

	/*
	 * If we are issuing a LOGO, we may try to recover the remote NPort
	 * by issuing a PLOGI later. Even though we issue ELS cmds by the
	 * VPI, if we have a valid RPI, and that RPI gets unreg'ed while
	 * that ELS command is in-flight, the HBA returns a IOERR_INVALID_RPI
	 * for that ELS cmd. To avoid this situation, lets get rid of the
	 * RPI right now, before any ELS cmds are sent.
	 */
	spin_lock_irq(shost->host_lock);
	ndlp->nlp_flag |= NLP_ISSUE_LOGO;
	spin_unlock_irq(shost->host_lock);
	if (lpfc_unreg_rpi(vport, ndlp)) {
		lpfc_els_free_iocb(phba, elsiocb);
		return 0;
	}

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

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

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

	irsp = &rspiocb->iocb;

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

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

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

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

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

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

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

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

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

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

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

	lpfc_nlp_put(ndlp);
	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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