Merge branch 'fix/sun8i' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...

[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / lpfc / lpfc_nvme.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2017 Broadcom. All Rights Reserved. The term      *
 * “Broadcom” refers to Broadcom Limited and/or its subsidiaries.  *
 * Copyright (C) 2004-2016 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.broadcom.com                                                *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 ********************************************************************/
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <asm/unaligned.h>
#include <linux/crc-t10dif.h>
#include <net/checksum.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/fc/fc_fs.h>

#include <linux/nvme.h>
#include <linux/nvme-fc-driver.h>
#include <linux/nvme-fc.h>
#include "lpfc_version.h"
#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc.h"
#include "lpfc_nvme.h"
#include "lpfc_scsi.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_vport.h"
#include "lpfc_debugfs.h"

/* NVME initiator-based functions */

static struct lpfc_nvme_buf *
lpfc_get_nvme_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp);

static void
lpfc_release_nvme_buf(struct lpfc_hba *, struct lpfc_nvme_buf *);


/**
 * lpfc_nvme_create_queue -
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @qidx: An cpu index used to affinitize IO queues and MSIX vectors.
 * @handle: An opaque driver handle used in follow-up calls.
 *
 * Driver registers this routine to preallocate and initialize any
 * internal data structures to bind the @qidx to its internal IO queues.
 * A hardware queue maps (qidx) to a specific driver MSI-X vector/EQ/CQ/WQ.
 *
 * Return value :
 *   0 - Success
 *   -EINVAL - Unsupported input value.
 *   -ENOMEM - Could not alloc necessary memory
 **/
static int
lpfc_nvme_create_queue(struct nvme_fc_local_port *pnvme_lport,
                       unsigned int qidx, u16 qsize,
                       void **handle)
{
        struct lpfc_nvme_lport *lport;
        struct lpfc_vport *vport;
        struct lpfc_nvme_qhandle *qhandle;
        char *str;

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        vport = lport->vport;
        qhandle = kzalloc(sizeof(struct lpfc_nvme_qhandle), GFP_KERNEL);
        if (qhandle == NULL)
                return -ENOMEM;

        qhandle->cpu_id = smp_processor_id();
        qhandle->qidx = qidx;
        /*
         * NVME qidx == 0 is the admin queue, so both admin queue
         * and first IO queue will use MSI-X vector and associated
         * EQ/CQ/WQ at index 0. After that they are sequentially assigned.
         */
        if (qidx) {
                str = "IO ";  /* IO queue */
                qhandle->index = ((qidx - 1) %
                        vport->phba->cfg_nvme_io_channel);
        } else {
                str = "ADM";  /* Admin queue */
                qhandle->index = qidx;
        }

        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                         "6073 Binding %s HdwQueue %d  (cpu %d) to "
                         "io_channel %d qhandle %p\n", str,
                         qidx, qhandle->cpu_id, qhandle->index, qhandle);
        *handle = (void *)qhandle;
        return 0;
}

/**
 * lpfc_nvme_delete_queue -
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @qidx: An cpu index used to affinitize IO queues and MSIX vectors.
 * @handle: An opaque driver handle from lpfc_nvme_create_queue
 *
 * Driver registers this routine to free
 * any internal data structures to bind the @qidx to its internal
 * IO queues.
 *
 * Return value :
 *   0 - Success
 *   TODO:  What are the failure codes.
 **/
static void
lpfc_nvme_delete_queue(struct nvme_fc_local_port *pnvme_lport,
                       unsigned int qidx,
                       void *handle)
{
        struct lpfc_nvme_lport *lport;
        struct lpfc_vport *vport;

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        vport = lport->vport;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME,
                        "6001 ENTER.  lpfc_pnvme %p, qidx x%xi qhandle %p\n",
                        lport, qidx, handle);
        kfree(handle);
}

static void
lpfc_nvme_localport_delete(struct nvme_fc_local_port *localport)
{
        struct lpfc_nvme_lport *lport = localport->private;

        /* release any threads waiting for the unreg to complete */
        complete(&lport->lport_unreg_done);
}

/* lpfc_nvme_remoteport_delete
 *
 * @remoteport: Pointer to an nvme transport remoteport instance.
 *
 * This is a template downcall.  NVME transport calls this function
 * when it has completed the unregistration of a previously
 * registered remoteport.
 *
 * Return value :
 * None
 */
void
lpfc_nvme_remoteport_delete(struct nvme_fc_remote_port *remoteport)
{
        struct lpfc_nvme_rport *rport = remoteport->private;
        struct lpfc_vport *vport;
        struct lpfc_nodelist *ndlp;

        ndlp = rport->ndlp;
        if (!ndlp)
                goto rport_err;

        vport = ndlp->vport;
        if (!vport)
                goto rport_err;

        /* Remove this rport from the lport's list - memory is owned by the
         * transport. Remove the ndlp reference for the NVME transport before
         * calling state machine to remove the node, this is devloss = 0
         * semantics.
         */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                        "6146 remoteport delete complete %p\n",
                        remoteport);
        list_del(&rport->list);
        lpfc_nlp_put(ndlp);

 rport_err:
        /* This call has to execute as long as the rport is valid.
         * Release any threads waiting for the unreg to complete.
         */
        complete(&rport->rport_unreg_done);
}

static void
lpfc_nvme_cmpl_gen_req(struct lpfc_hba *phba, struct lpfc_iocbq *cmdwqe,
                       struct lpfc_wcqe_complete *wcqe)
{
        struct lpfc_vport *vport = cmdwqe->vport;
        uint32_t status;
        struct nvmefc_ls_req *pnvme_lsreq;
        struct lpfc_dmabuf *buf_ptr;
        struct lpfc_nodelist *ndlp;

        vport->phba->fc4NvmeLsCmpls++;

        pnvme_lsreq = (struct nvmefc_ls_req *)cmdwqe->context2;
        status = bf_get(lpfc_wcqe_c_status, wcqe) & LPFC_IOCB_STATUS_MASK;
        ndlp = (struct lpfc_nodelist *)cmdwqe->context1;
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6047 nvme cmpl Enter "
                         "Data %p DID %x Xri: %x status %x cmd:%p lsreg:%p "
                         "bmp:%p ndlp:%p\n",
                         pnvme_lsreq, ndlp ? ndlp->nlp_DID : 0,
                         cmdwqe->sli4_xritag, status,
                         cmdwqe, pnvme_lsreq, cmdwqe->context3, ndlp);

        lpfc_nvmeio_data(phba, "NVME LS  CMPL: xri x%x stat x%x parm x%x\n",
                         cmdwqe->sli4_xritag, status, wcqe->parameter);

        if (cmdwqe->context3) {
                buf_ptr = (struct lpfc_dmabuf *)cmdwqe->context3;
                lpfc_mbuf_free(phba, buf_ptr->virt, buf_ptr->phys);
                kfree(buf_ptr);
                cmdwqe->context3 = NULL;
        }
        if (pnvme_lsreq->done)
                pnvme_lsreq->done(pnvme_lsreq, status);
        else
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                                 "6046 nvme cmpl without done call back? "
                                 "Data %p DID %x Xri: %x status %x\n",
                                pnvme_lsreq, ndlp ? ndlp->nlp_DID : 0,
                                cmdwqe->sli4_xritag, status);
        if (ndlp) {
                lpfc_nlp_put(ndlp);
                cmdwqe->context1 = NULL;
        }
        lpfc_sli_release_iocbq(phba, cmdwqe);
}

static int
lpfc_nvme_gen_req(struct lpfc_vport *vport, struct lpfc_dmabuf *bmp,
                  struct lpfc_dmabuf *inp,
                 struct nvmefc_ls_req *pnvme_lsreq,
             void (*cmpl)(struct lpfc_hba *, struct lpfc_iocbq *,
                           struct lpfc_wcqe_complete *),
             struct lpfc_nodelist *ndlp, uint32_t num_entry,
             uint32_t tmo, uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        union lpfc_wqe *wqe;
        struct lpfc_iocbq *genwqe;
        struct ulp_bde64 *bpl;
        struct ulp_bde64 bde;
        int i, rc, xmit_len, first_len;

        /* Allocate buffer for  command WQE */
        genwqe = lpfc_sli_get_iocbq(phba);
        if (genwqe == NULL)
                return 1;

        wqe = &genwqe->wqe;
        memset(wqe, 0, sizeof(union lpfc_wqe));

        genwqe->context3 = (uint8_t *)bmp;
        genwqe->iocb_flag |= LPFC_IO_NVME_LS;

        /* Save for completion so we can release these resources */
        genwqe->context1 = lpfc_nlp_get(ndlp);
        genwqe->context2 = (uint8_t *)pnvme_lsreq;
        /* Fill in payload, bp points to frame payload */

        if (!tmo)
                /* FC spec states we need 3 * ratov for CT requests */
                tmo = (3 * phba->fc_ratov);

        /* For this command calculate the xmit length of the request bde. */
        xmit_len = 0;
        first_len = 0;
        bpl = (struct ulp_bde64 *)bmp->virt;
        for (i = 0; i < num_entry; i++) {
                bde.tus.w = bpl[i].tus.w;
                if (bde.tus.f.bdeFlags != BUFF_TYPE_BDE_64)
                        break;
                xmit_len += bde.tus.f.bdeSize;
                if (i == 0)
                        first_len = xmit_len;
        }

        genwqe->rsvd2 = num_entry;
        genwqe->hba_wqidx = 0;

        /* Words 0 - 2 */
        wqe->generic.bde.tus.f.bdeFlags = BUFF_TYPE_BDE_64;
        wqe->generic.bde.tus.f.bdeSize = first_len;
        wqe->generic.bde.addrLow = bpl[0].addrLow;
        wqe->generic.bde.addrHigh = bpl[0].addrHigh;

        /* Word 3 */
        wqe->gen_req.request_payload_len = first_len;

        /* Word 4 */

        /* Word 5 */
        bf_set(wqe_dfctl, &wqe->gen_req.wge_ctl, 0);
        bf_set(wqe_si, &wqe->gen_req.wge_ctl, 1);
        bf_set(wqe_la, &wqe->gen_req.wge_ctl, 1);
        bf_set(wqe_rctl, &wqe->gen_req.wge_ctl, FC_RCTL_DD_UNSOL_CTL);
        bf_set(wqe_type, &wqe->gen_req.wge_ctl, FC_TYPE_NVME);

        /* Word 6 */
        bf_set(wqe_ctxt_tag, &wqe->gen_req.wqe_com,
               phba->sli4_hba.rpi_ids[ndlp->nlp_rpi]);
        bf_set(wqe_xri_tag, &wqe->gen_req.wqe_com, genwqe->sli4_xritag);

        /* Word 7 */
        bf_set(wqe_tmo, &wqe->gen_req.wqe_com, (vport->phba->fc_ratov-1));
        bf_set(wqe_class, &wqe->gen_req.wqe_com, CLASS3);
        bf_set(wqe_cmnd, &wqe->gen_req.wqe_com, CMD_GEN_REQUEST64_WQE);
        bf_set(wqe_ct, &wqe->gen_req.wqe_com, SLI4_CT_RPI);

        /* Word 8 */
        wqe->gen_req.wqe_com.abort_tag = genwqe->iotag;

        /* Word 9 */
        bf_set(wqe_reqtag, &wqe->gen_req.wqe_com, genwqe->iotag);

        /* Word 10 */
        bf_set(wqe_dbde, &wqe->gen_req.wqe_com, 1);
        bf_set(wqe_iod, &wqe->gen_req.wqe_com, LPFC_WQE_IOD_READ);
        bf_set(wqe_qosd, &wqe->gen_req.wqe_com, 1);
        bf_set(wqe_lenloc, &wqe->gen_req.wqe_com, LPFC_WQE_LENLOC_NONE);
        bf_set(wqe_ebde_cnt, &wqe->gen_req.wqe_com, 0);

        /* Word 11 */
        bf_set(wqe_cqid, &wqe->gen_req.wqe_com, LPFC_WQE_CQ_ID_DEFAULT);
        bf_set(wqe_cmd_type, &wqe->gen_req.wqe_com, OTHER_COMMAND);


        /* Issue GEN REQ WQE for NPORT <did> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "6050 Issue GEN REQ WQE to NPORT x%x "
                         "Data: x%x x%x wq:%p lsreq:%p bmp:%p xmit:%d 1st:%d\n",
                         ndlp->nlp_DID, genwqe->iotag,
                         vport->port_state,
                        genwqe, pnvme_lsreq, bmp, xmit_len, first_len);
        genwqe->wqe_cmpl = cmpl;
        genwqe->iocb_cmpl = NULL;
        genwqe->drvrTimeout = tmo + LPFC_DRVR_TIMEOUT;
        genwqe->vport = vport;
        genwqe->retry = retry;

        lpfc_nvmeio_data(phba, "NVME LS  XMIT: xri x%x iotag x%x to x%06x\n",
                         genwqe->sli4_xritag, genwqe->iotag, ndlp->nlp_DID);

        rc = lpfc_sli4_issue_wqe(phba, LPFC_ELS_RING, genwqe);
        if (rc == WQE_ERROR) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "6045 Issue GEN REQ WQE to NPORT x%x "
                                 "Data: x%x x%x\n",
                                 ndlp->nlp_DID, genwqe->iotag,
                                 vport->port_state);
                lpfc_sli_release_iocbq(phba, genwqe);
                return 1;
        }
        return 0;
}

/**
 * lpfc_nvme_ls_req - Issue an Link Service request
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @lpfc_nvme_lport: Pointer to the driver's local port data
 * @lpfc_nvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
 *
 * Driver registers this routine to handle any link service request
 * from the nvme_fc transport to a remote nvme-aware port.
 *
 * Return value :
 *   0 - Success
 *   TODO: What are the failure codes.
 **/
static int
lpfc_nvme_ls_req(struct nvme_fc_local_port *pnvme_lport,
                 struct nvme_fc_remote_port *pnvme_rport,
                 struct nvmefc_ls_req *pnvme_lsreq)
{
        int ret = 0;
        struct lpfc_nvme_lport *lport;
        struct lpfc_vport *vport;
        struct lpfc_nodelist *ndlp;
        struct ulp_bde64 *bpl;
        struct lpfc_dmabuf *bmp;

        /* there are two dma buf in the request, actually there is one and
         * the second one is just the start address + cmd size.
         * Before calling lpfc_nvme_gen_req these buffers need to be wrapped
         * in a lpfc_dmabuf struct. When freeing we just free the wrapper
         * because the nvem layer owns the data bufs.
         * We do not have to break these packets open, we don't care what is in
         * them. And we do not have to look at the resonse data, we only care
         * that we got a response. All of the caring is going to happen in the
         * nvme-fc layer.
         */

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        vport = lport->vport;

        ndlp = lpfc_findnode_did(vport, pnvme_rport->port_id);
        if (!ndlp) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                                 "6043 Could not find node for DID %x\n",
                                 pnvme_rport->port_id);
                return 1;
        }
        bmp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (!bmp) {

                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                                 "6044 Could not find node for DID %x\n",
                                 pnvme_rport->port_id);
                return 2;
        }
        INIT_LIST_HEAD(&bmp->list);
        bmp->virt = lpfc_mbuf_alloc(vport->phba, MEM_PRI, &(bmp->phys));
        if (!bmp->virt) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                                 "6042 Could not find node for DID %x\n",
                                 pnvme_rport->port_id);
                kfree(bmp);
                return 3;
        }
        bpl = (struct ulp_bde64 *)bmp->virt;
        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pnvme_lsreq->rqstdma));
        bpl->addrLow = le32_to_cpu(putPaddrLow(pnvme_lsreq->rqstdma));
        bpl->tus.f.bdeFlags = 0;
        bpl->tus.f.bdeSize = pnvme_lsreq->rqstlen;
        bpl->tus.w = le32_to_cpu(bpl->tus.w);
        bpl++;

        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pnvme_lsreq->rspdma));
        bpl->addrLow = le32_to_cpu(putPaddrLow(pnvme_lsreq->rspdma));
        bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
        bpl->tus.f.bdeSize = pnvme_lsreq->rsplen;
        bpl->tus.w = le32_to_cpu(bpl->tus.w);

        /* Expand print to include key fields. */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6051 ENTER.  lport %p, rport %p lsreq%p rqstlen:%d "
                         "rsplen:%d %pad %pad\n",
                         pnvme_lport, pnvme_rport,
                         pnvme_lsreq, pnvme_lsreq->rqstlen,
                         pnvme_lsreq->rsplen, &pnvme_lsreq->rqstdma,
                         &pnvme_lsreq->rspdma);

        vport->phba->fc4NvmeLsRequests++;

        /* Hardcode the wait to 30 seconds.  Connections are failing otherwise.
         * This code allows it all to work.
         */
        ret = lpfc_nvme_gen_req(vport, bmp, pnvme_lsreq->rqstaddr,
                                pnvme_lsreq, lpfc_nvme_cmpl_gen_req,
                                ndlp, 2, 30, 0);
        if (ret != WQE_SUCCESS) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                                 "6052 EXIT. issue ls wqe failed lport %p, "
                                 "rport %p lsreq%p Status %x DID %x\n",
                                 pnvme_lport, pnvme_rport, pnvme_lsreq,
                                 ret, ndlp->nlp_DID);
                lpfc_mbuf_free(vport->phba, bmp->virt, bmp->phys);
                kfree(bmp);
                return ret;
        }

        /* Stub in routine and return 0 for now. */
        return ret;
}

/**
 * lpfc_nvme_ls_abort - Issue an Link Service request
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @lpfc_nvme_lport: Pointer to the driver's local port data
 * @lpfc_nvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
 *
 * Driver registers this routine to handle any link service request
 * from the nvme_fc transport to a remote nvme-aware port.
 *
 * Return value :
 *   0 - Success
 *   TODO: What are the failure codes.
 **/
static void
lpfc_nvme_ls_abort(struct nvme_fc_local_port *pnvme_lport,
                   struct nvme_fc_remote_port *pnvme_rport,
                   struct nvmefc_ls_req *pnvme_lsreq)
{
        struct lpfc_nvme_lport *lport;
        struct lpfc_vport *vport;
        struct lpfc_hba *phba;
        struct lpfc_nodelist *ndlp;
        LIST_HEAD(abort_list);
        struct lpfc_sli_ring *pring;
        struct lpfc_iocbq *wqe, *next_wqe;

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        vport = lport->vport;
        phba = vport->phba;

        ndlp = lpfc_findnode_did(vport, pnvme_rport->port_id);
        if (!ndlp) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_ABTS,
                                 "6049 Could not find node for DID %x\n",
                                 pnvme_rport->port_id);
                return;
        }

        /* Expand print to include key fields. */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_ABTS,
                         "6040 ENTER.  lport %p, rport %p lsreq %p rqstlen:%d "
                         "rsplen:%d %pad %pad\n",
                         pnvme_lport, pnvme_rport,
                         pnvme_lsreq, pnvme_lsreq->rqstlen,
                         pnvme_lsreq->rsplen, &pnvme_lsreq->rqstdma,
                         &pnvme_lsreq->rspdma);

        /*
         * Lock the ELS ring txcmplq and build a local list of all ELS IOs
         * that need an ABTS.  The IOs need to stay on the txcmplq so that
         * the abort operation completes them successfully.
         */
        pring = phba->sli4_hba.nvmels_wq->pring;
        spin_lock_irq(&phba->hbalock);
        spin_lock(&pring->ring_lock);
        list_for_each_entry_safe(wqe, next_wqe, &pring->txcmplq, list) {
                /* Add to abort_list on on NDLP match. */
                if (lpfc_check_sli_ndlp(phba, pring, wqe, ndlp)) {
                        wqe->iocb_flag |= LPFC_DRIVER_ABORTED;
                        list_add_tail(&wqe->dlist, &abort_list);
                }
        }
        spin_unlock(&pring->ring_lock);
        spin_unlock_irq(&phba->hbalock);

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

/* Fix up the existing sgls for NVME IO. */
static void
lpfc_nvme_adj_fcp_sgls(struct lpfc_vport *vport,
                       struct lpfc_nvme_buf *lpfc_ncmd,
                       struct nvmefc_fcp_req *nCmd)
{
        struct sli4_sge *sgl;
        union lpfc_wqe128 *wqe;
        uint32_t *wptr, *dptr;

        /*
         * Adjust the FCP_CMD and FCP_RSP DMA data and sge_len to
         * match NVME.  NVME sends 96 bytes. Also, use the
         * nvme commands command and response dma addresses
         * rather than the virtual memory to ease the restore
         * operation.
         */
        sgl = lpfc_ncmd->nvme_sgl;
        sgl->sge_len = cpu_to_le32(nCmd->cmdlen);

        sgl++;

        /* Setup the physical region for the FCP RSP */
        sgl->addr_hi = cpu_to_le32(putPaddrHigh(nCmd->rspdma));
        sgl->addr_lo = cpu_to_le32(putPaddrLow(nCmd->rspdma));
        sgl->word2 = le32_to_cpu(sgl->word2);
        if (nCmd->sg_cnt)
                bf_set(lpfc_sli4_sge_last, sgl, 0);
        else
                bf_set(lpfc_sli4_sge_last, sgl, 1);
        sgl->word2 = cpu_to_le32(sgl->word2);
        sgl->sge_len = cpu_to_le32(nCmd->rsplen);

        /*
         * Get a local pointer to the built-in wqe and correct
         * the cmd size to match NVME's 96 bytes and fix
         * the dma address.
         */

        /* 128 byte wqe support here */
        wqe = (union lpfc_wqe128 *)&lpfc_ncmd->cur_iocbq.wqe;

        /* Word 0-2 - NVME CMND IU (embedded payload) */
        wqe->generic.bde.tus.f.bdeFlags = BUFF_TYPE_BDE_IMMED;
        wqe->generic.bde.tus.f.bdeSize = 60;
        wqe->generic.bde.addrHigh = 0;
        wqe->generic.bde.addrLow =  64;  /* Word 16 */

        /* Word 3 */
        bf_set(payload_offset_len, &wqe->fcp_icmd,
               (nCmd->rsplen + nCmd->cmdlen));

        /* Word 10 */
        bf_set(wqe_nvme, &wqe->fcp_icmd.wqe_com, 1);
        bf_set(wqe_wqes, &wqe->fcp_icmd.wqe_com, 1);

        /*
         * Embed the payload in the last half of the WQE
         * WQE words 16-30 get the NVME CMD IU payload
         *
         * WQE Word 16 is already setup with flags
         * WQE words 17-19 get payload Words 2-4
         * WQE words 20-21 get payload Words 6-7
         * WQE words 22-29 get payload Words 16-23
         */
        wptr = &wqe->words[17];  /* WQE ptr */
        dptr = (uint32_t *)nCmd->cmdaddr;  /* payload ptr */
        dptr += 2;              /* Skip Words 0-1 in payload */

        *wptr++ = *dptr++;      /* Word 2 */
        *wptr++ = *dptr++;      /* Word 3 */
        *wptr++ = *dptr++;      /* Word 4 */
        dptr++;                 /* Skip Word 5 in payload */
        *wptr++ = *dptr++;      /* Word 6 */
        *wptr++ = *dptr++;      /* Word 7 */
        dptr += 8;              /* Skip Words 8-15 in payload */
        *wptr++ = *dptr++;      /* Word 16 */
        *wptr++ = *dptr++;      /* Word 17 */
        *wptr++ = *dptr++;      /* Word 18 */
        *wptr++ = *dptr++;      /* Word 19 */
        *wptr++ = *dptr++;      /* Word 20 */
        *wptr++ = *dptr++;      /* Word 21 */
        *wptr++ = *dptr++;      /* Word 22 */
        *wptr   = *dptr;        /* Word 23 */
}

#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
static void
lpfc_nvme_ktime(struct lpfc_hba *phba,
                struct lpfc_nvme_buf *lpfc_ncmd)
{
        uint64_t seg1, seg2, seg3, seg4;

        if (!phba->ktime_on)
                return;
        if (!lpfc_ncmd->ts_last_cmd ||
            !lpfc_ncmd->ts_cmd_start ||
            !lpfc_ncmd->ts_cmd_wqput ||
            !lpfc_ncmd->ts_isr_cmpl ||
            !lpfc_ncmd->ts_data_nvme)
                return;
        if (lpfc_ncmd->ts_cmd_start < lpfc_ncmd->ts_last_cmd)
                return;
        if (lpfc_ncmd->ts_cmd_wqput < lpfc_ncmd->ts_cmd_start)
                return;
        if (lpfc_ncmd->ts_isr_cmpl < lpfc_ncmd->ts_cmd_wqput)
                return;
        if (lpfc_ncmd->ts_data_nvme < lpfc_ncmd->ts_isr_cmpl)
                return;
        /*
         * Segment 1 - Time from Last FCP command cmpl is handed
         * off to NVME Layer to start of next command.
         * Segment 2 - Time from Driver receives a IO cmd start
         * from NVME Layer to WQ put is done on IO cmd.
         * Segment 3 - Time from Driver WQ put is done on IO cmd
         * to MSI-X ISR for IO cmpl.
         * Segment 4 - Time from MSI-X ISR for IO cmpl to when
         * cmpl is handled off to the NVME Layer.
         */
        seg1 = lpfc_ncmd->ts_cmd_start - lpfc_ncmd->ts_last_cmd;
        if (seg1 > 5000000)  /* 5 ms - for sequential IOs */
                return;

        /* Calculate times relative to start of IO */
        seg2 = (lpfc_ncmd->ts_cmd_wqput - lpfc_ncmd->ts_cmd_start);
        seg3 = (lpfc_ncmd->ts_isr_cmpl -
                lpfc_ncmd->ts_cmd_start) - seg2;
        seg4 = (lpfc_ncmd->ts_data_nvme -
                lpfc_ncmd->ts_cmd_start) - seg2 - seg3;
        phba->ktime_data_samples++;
        phba->ktime_seg1_total += seg1;
        if (seg1 < phba->ktime_seg1_min)
                phba->ktime_seg1_min = seg1;
        else if (seg1 > phba->ktime_seg1_max)
                phba->ktime_seg1_max = seg1;
        phba->ktime_seg2_total += seg2;
        if (seg2 < phba->ktime_seg2_min)
                phba->ktime_seg2_min = seg2;
        else if (seg2 > phba->ktime_seg2_max)
                phba->ktime_seg2_max = seg2;
        phba->ktime_seg3_total += seg3;
        if (seg3 < phba->ktime_seg3_min)
                phba->ktime_seg3_min = seg3;
        else if (seg3 > phba->ktime_seg3_max)
                phba->ktime_seg3_max = seg3;
        phba->ktime_seg4_total += seg4;
        if (seg4 < phba->ktime_seg4_min)
                phba->ktime_seg4_min = seg4;
        else if (seg4 > phba->ktime_seg4_max)
                phba->ktime_seg4_max = seg4;

        lpfc_ncmd->ts_last_cmd = 0;
        lpfc_ncmd->ts_cmd_start = 0;
        lpfc_ncmd->ts_cmd_wqput  = 0;
        lpfc_ncmd->ts_isr_cmpl = 0;
        lpfc_ncmd->ts_data_nvme = 0;
}
#endif

/**
 * lpfc_nvme_io_cmd_wqe_cmpl - Complete an NVME-over-FCP IO
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @lpfc_nvme_lport: Pointer to the driver's local port data
 * @lpfc_nvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
 *
 * Driver registers this routine as it io request handler.  This
 * routine issues an fcp WQE with data from the @lpfc_nvme_fcpreq
 * data structure to the rport indicated in @lpfc_nvme_rport.
 *
 * Return value :
 *   0 - Success
 *   TODO: What are the failure codes.
 **/
static void
lpfc_nvme_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn,
                          struct lpfc_wcqe_complete *wcqe)
{
        struct lpfc_nvme_buf *lpfc_ncmd =
                (struct lpfc_nvme_buf *)pwqeIn->context1;
        struct lpfc_vport *vport = pwqeIn->vport;
        struct nvmefc_fcp_req *nCmd;
        struct nvme_fc_ersp_iu *ep;
        struct nvme_fc_cmd_iu *cp;
        struct lpfc_nvme_rport *rport;
        struct lpfc_nodelist *ndlp;
        unsigned long flags;
        uint32_t code;
        uint16_t cid, sqhd, data;
        uint32_t *ptr;

        /* Sanity check on return of outstanding command */
        if (!lpfc_ncmd || !lpfc_ncmd->nvmeCmd || !lpfc_ncmd->nrport) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE | LOG_NVME_IOERR,
                                 "6071 Completion pointers bad on wqe %p.\n",
                                 wcqe);
                return;
        }
        phba->fc4NvmeIoCmpls++;

        nCmd = lpfc_ncmd->nvmeCmd;
        rport = lpfc_ncmd->nrport;

        lpfc_nvmeio_data(phba, "NVME FCP CMPL: xri x%x stat x%x parm x%x\n",
                         lpfc_ncmd->cur_iocbq.sli4_xritag,
                         bf_get(lpfc_wcqe_c_status, wcqe), wcqe->parameter);
        /*
         * Catch race where our node has transitioned, but the
         * transport is still transitioning.
         */
        ndlp = rport->ndlp;
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE | LOG_NVME_IOERR,
                                 "6061 rport %p, ndlp %p, DID x%06x ndlp "
                                 "not ready.\n",
                                 rport, ndlp, rport->remoteport->port_id);

                ndlp = lpfc_findnode_did(vport, rport->remoteport->port_id);
                if (!ndlp) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_IOERR,
                                         "6062 Ignoring NVME cmpl.  No ndlp\n");
                        goto out_err;
                }
        }

        code = bf_get(lpfc_wcqe_c_code, wcqe);
        if (code == CQE_CODE_NVME_ERSP) {
                /* For this type of CQE, we need to rebuild the rsp */
                ep = (struct nvme_fc_ersp_iu *)nCmd->rspaddr;

                /*
                 * Get Command Id from cmd to plug into response. This
                 * code is not needed in the next NVME Transport drop.
                 */
                cp = (struct nvme_fc_cmd_iu *)nCmd->cmdaddr;
                cid = cp->sqe.common.command_id;

                /*
                 * RSN is in CQE word 2
                 * SQHD is in CQE Word 3 bits 15:0
                 * Cmd Specific info is in CQE Word 1
                 * and in CQE Word 0 bits 15:0
                 */
                sqhd = bf_get(lpfc_wcqe_c_sqhead, wcqe);

                /* Now lets build the NVME ERSP IU */
                ep->iu_len = cpu_to_be16(8);
                ep->rsn = wcqe->parameter;
                ep->xfrd_len = cpu_to_be32(nCmd->payload_length);
                ep->rsvd12 = 0;
                ptr = (uint32_t *)&ep->cqe.result.u64;
                *ptr++ = wcqe->total_data_placed;
                data = bf_get(lpfc_wcqe_c_ersp0, wcqe);
                *ptr = (uint32_t)data;
                ep->cqe.sq_head = sqhd;
                ep->cqe.sq_id =  nCmd->sqid;
                ep->cqe.command_id = cid;
                ep->cqe.status = 0;

                lpfc_ncmd->status = IOSTAT_SUCCESS;
                lpfc_ncmd->result = 0;
                nCmd->rcv_rsplen = LPFC_NVME_ERSP_LEN;
                nCmd->transferred_length = nCmd->payload_length;
        } else {
                lpfc_ncmd->status = (bf_get(lpfc_wcqe_c_status, wcqe) &
                            LPFC_IOCB_STATUS_MASK);
                lpfc_ncmd->result = wcqe->parameter;

                /* For NVME, the only failure path that results in an
                 * IO error is when the adapter rejects it.  All other
                 * conditions are a success case and resolved by the
                 * transport.
                 * IOSTAT_FCP_RSP_ERROR means:
                 * 1. Length of data received doesn't match total
                 *    transfer length in WQE
                 * 2. If the RSP payload does NOT match these cases:
                 *    a. RSP length 12/24 bytes and all zeros
                 *    b. NVME ERSP
                 */
                switch (lpfc_ncmd->status) {
                case IOSTAT_SUCCESS:
                        nCmd->transferred_length = wcqe->total_data_placed;
                        nCmd->rcv_rsplen = 0;
                        nCmd->status = 0;
                        break;
                case IOSTAT_FCP_RSP_ERROR:
                        nCmd->transferred_length = wcqe->total_data_placed;
                        nCmd->rcv_rsplen = wcqe->parameter;
                        nCmd->status = 0;
                        /* Sanity check */
                        if (nCmd->rcv_rsplen == LPFC_NVME_ERSP_LEN)
                                break;
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_IOERR,
                                         "6081 NVME Completion Protocol Error: "
                                         "status x%x result x%x placed x%x\n",
                                         lpfc_ncmd->status, lpfc_ncmd->result,
                                         wcqe->total_data_placed);
                        break;
                default:
out_err:
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_IOERR,
                                         "6072 NVME Completion Error: "
                                         "status x%x result x%x placed x%x\n",
                                         lpfc_ncmd->status, lpfc_ncmd->result,
                                         wcqe->total_data_placed);
                        nCmd->transferred_length = 0;
                        nCmd->rcv_rsplen = 0;
                        nCmd->status = NVME_SC_FC_TRANSPORT_ERROR;
                }
        }

        /* pick up SLI4 exhange busy condition */
        if (bf_get(lpfc_wcqe_c_xb, wcqe))
                lpfc_ncmd->flags |= LPFC_SBUF_XBUSY;
        else
                lpfc_ncmd->flags &= ~LPFC_SBUF_XBUSY;

        if (ndlp && NLP_CHK_NODE_ACT(ndlp))
                atomic_dec(&ndlp->cmd_pending);

        /* Update stats and complete the IO.  There is
         * no need for dma unprep because the nvme_transport
         * owns the dma address.
         */
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        if (phba->ktime_on) {
                lpfc_ncmd->ts_isr_cmpl = pwqeIn->isr_timestamp;
                lpfc_ncmd->ts_data_nvme = ktime_get_ns();
                phba->ktime_last_cmd = lpfc_ncmd->ts_data_nvme;
                lpfc_nvme_ktime(phba, lpfc_ncmd);
        }
        if (phba->cpucheck_on & LPFC_CHECK_NVME_IO) {
                if (lpfc_ncmd->cpu != smp_processor_id())
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_IOERR,
                                         "6701 CPU Check cmpl: "
                                         "cpu %d expect %d\n",
                                         smp_processor_id(), lpfc_ncmd->cpu);
                if (lpfc_ncmd->cpu < LPFC_CHECK_CPU_CNT)
                        phba->cpucheck_cmpl_io[lpfc_ncmd->cpu]++;
        }
#endif
        nCmd->done(nCmd);

        spin_lock_irqsave(&phba->hbalock, flags);
        lpfc_ncmd->nrport = NULL;
        spin_unlock_irqrestore(&phba->hbalock, flags);

        lpfc_release_nvme_buf(phba, lpfc_ncmd);
}


/**
 * lpfc_nvme_prep_io_cmd - Issue an NVME-over-FCP IO
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @lpfc_nvme_lport: Pointer to the driver's local port data
 * @lpfc_nvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
 * @lpfc_nvme_fcreq: IO request from nvme fc to driver.
 * @hw_queue_handle: Driver-returned handle in lpfc_nvme_create_queue
 *
 * Driver registers this routine as it io request handler.  This
 * routine issues an fcp WQE with data from the @lpfc_nvme_fcpreq
 * data structure to the rport indicated in @lpfc_nvme_rport.
 *
 * Return value :
 *   0 - Success
 *   TODO: What are the failure codes.
 **/
static int
lpfc_nvme_prep_io_cmd(struct lpfc_vport *vport,
                      struct lpfc_nvme_buf *lpfc_ncmd,
                      struct lpfc_nodelist *pnode)
{
        struct lpfc_hba *phba = vport->phba;
        struct nvmefc_fcp_req *nCmd = lpfc_ncmd->nvmeCmd;
        struct lpfc_iocbq *pwqeq = &(lpfc_ncmd->cur_iocbq);
        union lpfc_wqe128 *wqe = (union lpfc_wqe128 *)&pwqeq->wqe;
        uint32_t req_len;

        if (!pnode || !NLP_CHK_NODE_ACT(pnode))
                return -EINVAL;

        /*
         * There are three possibilities here - use scatter-gather segment, use
         * the single mapping, or neither.
         */
        wqe->fcp_iwrite.initial_xfer_len = 0;
        if (nCmd->sg_cnt) {
                if (nCmd->io_dir == NVMEFC_FCP_WRITE) {
                        /* Word 5 */
                        if ((phba->cfg_nvme_enable_fb) &&
                            (pnode->nlp_flag & NLP_FIRSTBURST)) {
                                req_len = lpfc_ncmd->nvmeCmd->payload_length;
                                if (req_len < pnode->nvme_fb_size)
                                        wqe->fcp_iwrite.initial_xfer_len =
                                                req_len;
                                else
                                        wqe->fcp_iwrite.initial_xfer_len =
                                                pnode->nvme_fb_size;
                        }

                        /* Word 7 */
                        bf_set(wqe_cmnd, &wqe->generic.wqe_com,
                               CMD_FCP_IWRITE64_WQE);
                        bf_set(wqe_pu, &wqe->generic.wqe_com,
                               PARM_READ_CHECK);

                        /* Word 10 */
                        bf_set(wqe_qosd, &wqe->fcp_iwrite.wqe_com, 0);
                        bf_set(wqe_iod, &wqe->fcp_iwrite.wqe_com,
                               LPFC_WQE_IOD_WRITE);
                        bf_set(wqe_lenloc, &wqe->fcp_iwrite.wqe_com,
                               LPFC_WQE_LENLOC_WORD4);
                        if (phba->cfg_nvme_oas)
                                bf_set(wqe_oas, &wqe->fcp_iwrite.wqe_com, 1);

                        /* Word 11 */
                        bf_set(wqe_cmd_type, &wqe->generic.wqe_com,
                               NVME_WRITE_CMD);

                        /* Word 16 */
                        wqe->words[16] = LPFC_NVME_EMBED_WRITE;

                        phba->fc4NvmeOutputRequests++;
                } else {
                        /* Word 7 */
                        bf_set(wqe_cmnd, &wqe->generic.wqe_com,
                               CMD_FCP_IREAD64_WQE);
                        bf_set(wqe_pu, &wqe->generic.wqe_com,
                               PARM_READ_CHECK);

                        /* Word 10 */
                        bf_set(wqe_qosd, &wqe->fcp_iread.wqe_com, 0);
                        bf_set(wqe_iod, &wqe->fcp_iread.wqe_com,
                               LPFC_WQE_IOD_READ);
                        bf_set(wqe_lenloc, &wqe->fcp_iread.wqe_com,
                               LPFC_WQE_LENLOC_WORD4);
                        if (phba->cfg_nvme_oas)
                                bf_set(wqe_oas, &wqe->fcp_iread.wqe_com, 1);

                        /* Word 11 */
                        bf_set(wqe_cmd_type, &wqe->generic.wqe_com,
                               NVME_READ_CMD);

                        /* Word 16 */
                        wqe->words[16] = LPFC_NVME_EMBED_READ;

                        phba->fc4NvmeInputRequests++;
                }
        } else {
                /* Word 4 */
                wqe->fcp_icmd.rsrvd4 = 0;

                /* Word 7 */
                bf_set(wqe_cmnd, &wqe->generic.wqe_com, CMD_FCP_ICMND64_WQE);
                bf_set(wqe_pu, &wqe->generic.wqe_com, 0);

                /* Word 10 */
                bf_set(wqe_qosd, &wqe->fcp_icmd.wqe_com, 1);
                bf_set(wqe_iod, &wqe->fcp_icmd.wqe_com, LPFC_WQE_IOD_WRITE);
                bf_set(wqe_lenloc, &wqe->fcp_icmd.wqe_com,
                       LPFC_WQE_LENLOC_NONE);
                if (phba->cfg_nvme_oas)
                        bf_set(wqe_oas, &wqe->fcp_icmd.wqe_com, 1);

                /* Word 11 */
                bf_set(wqe_cmd_type, &wqe->generic.wqe_com, NVME_READ_CMD);

                /* Word 16 */
                wqe->words[16] = LPFC_NVME_EMBED_CMD;

                phba->fc4NvmeControlRequests++;
        }
        /*
         * Finish initializing those WQE fields that are independent
         * of the nvme_cmnd request_buffer
         */

        /* Word 6 */
        bf_set(wqe_ctxt_tag, &wqe->generic.wqe_com,
               phba->sli4_hba.rpi_ids[pnode->nlp_rpi]);
        bf_set(wqe_xri_tag, &wqe->generic.wqe_com, pwqeq->sli4_xritag);

        /* Word 7 */
        /* Preserve Class data in the ndlp. */
        bf_set(wqe_class, &wqe->generic.wqe_com,
               (pnode->nlp_fcp_info & 0x0f));

        /* Word 8 */
        wqe->generic.wqe_com.abort_tag = pwqeq->iotag;

        /* Word 9 */
        bf_set(wqe_reqtag, &wqe->generic.wqe_com, pwqeq->iotag);

        /* Word 11 */
        bf_set(wqe_cqid, &wqe->generic.wqe_com, LPFC_WQE_CQ_ID_DEFAULT);

        pwqeq->vport = vport;
        return 0;
}


/**
 * lpfc_nvme_prep_io_dma - Issue an NVME-over-FCP IO
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @lpfc_nvme_lport: Pointer to the driver's local port data
 * @lpfc_nvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
 * @lpfc_nvme_fcreq: IO request from nvme fc to driver.
 * @hw_queue_handle: Driver-returned handle in lpfc_nvme_create_queue
 *
 * Driver registers this routine as it io request handler.  This
 * routine issues an fcp WQE with data from the @lpfc_nvme_fcpreq
 * data structure to the rport indicated in @lpfc_nvme_rport.
 *
 * Return value :
 *   0 - Success
 *   TODO: What are the failure codes.
 **/
static int
lpfc_nvme_prep_io_dma(struct lpfc_vport *vport,
                      struct lpfc_nvme_buf *lpfc_ncmd)
{
        struct lpfc_hba *phba = vport->phba;
        struct nvmefc_fcp_req *nCmd = lpfc_ncmd->nvmeCmd;
        union lpfc_wqe128 *wqe = (union lpfc_wqe128 *)&lpfc_ncmd->cur_iocbq.wqe;
        struct sli4_sge *sgl = lpfc_ncmd->nvme_sgl;
        struct scatterlist *data_sg;
        struct sli4_sge *first_data_sgl;
        dma_addr_t physaddr;
        uint32_t num_bde = 0;
        uint32_t dma_len;
        uint32_t dma_offset = 0;
        int nseg, i;

        /* Fix up the command and response DMA stuff. */
        lpfc_nvme_adj_fcp_sgls(vport, lpfc_ncmd, nCmd);

        /*
         * There are three possibilities here - use scatter-gather segment, use
         * the single mapping, or neither.
         */
        if (nCmd->sg_cnt) {
                /*
                 * Jump over the cmd and rsp SGEs.  The fix routine
                 * has already adjusted for this.
                 */
                sgl += 2;

                first_data_sgl = sgl;
                lpfc_ncmd->seg_cnt = nCmd->sg_cnt;
                if (lpfc_ncmd->seg_cnt > phba->cfg_sg_seg_cnt) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_NVME_IOERR,
                                        "6058 Too many sg segments from "
                                        "NVME Transport.  Max %d, "
                                        "nvmeIO sg_cnt %d\n",
                                        phba->cfg_sg_seg_cnt,
                                        lpfc_ncmd->seg_cnt);
                        lpfc_ncmd->seg_cnt = 0;
                        return 1;
                }

                /*
                 * The driver established a maximum scatter-gather segment count
                 * during probe that limits the number of sg elements in any
                 * single nvme command.  Just run through the seg_cnt and format
                 * the sge's.
                 */
                nseg = nCmd->sg_cnt;
                data_sg = nCmd->first_sgl;
                for (i = 0; i < nseg; i++) {
                        if (data_sg == NULL) {
                                lpfc_printf_log(phba, KERN_ERR, LOG_NVME_IOERR,
                                                "6059 dptr err %d, nseg %d\n",
                                                i, nseg);
                                lpfc_ncmd->seg_cnt = 0;
                                return 1;
                        }
                        physaddr = data_sg->dma_address;
                        dma_len = data_sg->length;
                        sgl->addr_lo = cpu_to_le32(putPaddrLow(physaddr));
                        sgl->addr_hi = cpu_to_le32(putPaddrHigh(physaddr));
                        sgl->word2 = le32_to_cpu(sgl->word2);
                        if ((num_bde + 1) == nseg)
                                bf_set(lpfc_sli4_sge_last, sgl, 1);
                        else
                                bf_set(lpfc_sli4_sge_last, sgl, 0);
                        bf_set(lpfc_sli4_sge_offset, sgl, dma_offset);
                        bf_set(lpfc_sli4_sge_type, sgl, LPFC_SGE_TYPE_DATA);
                        sgl->word2 = cpu_to_le32(sgl->word2);
                        sgl->sge_len = cpu_to_le32(dma_len);

                        dma_offset += dma_len;
                        data_sg = sg_next(data_sg);
                        sgl++;
                }
        } else {
                /* For this clause to be valid, the payload_length
                 * and sg_cnt must zero.
                 */
                if (nCmd->payload_length != 0) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_NVME_IOERR,
                                        "6063 NVME DMA Prep Err: sg_cnt %d "
                                        "payload_length x%x\n",
                                        nCmd->sg_cnt, nCmd->payload_length);
                        return 1;
                }
        }

        /*
         * Due to difference in data length between DIF/non-DIF paths,
         * we need to set word 4 of WQE here
         */
        wqe->fcp_iread.total_xfer_len = nCmd->payload_length;
        return 0;
}

/**
 * lpfc_nvme_fcp_io_submit - Issue an NVME-over-FCP IO
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @lpfc_nvme_lport: Pointer to the driver's local port data
 * @lpfc_nvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
 * @lpfc_nvme_fcreq: IO request from nvme fc to driver.
 * @hw_queue_handle: Driver-returned handle in lpfc_nvme_create_queue
 *
 * Driver registers this routine as it io request handler.  This
 * routine issues an fcp WQE with data from the @lpfc_nvme_fcpreq
 * data structure to the rport
 indicated in @lpfc_nvme_rport.
 *
 * Return value :
 *   0 - Success
 *   TODO: What are the failure codes.
 **/
static int
lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport,
                        struct nvme_fc_remote_port *pnvme_rport,
                        void *hw_queue_handle,
                        struct nvmefc_fcp_req *pnvme_fcreq)
{
        int ret = 0;
        struct lpfc_nvme_lport *lport;
        struct lpfc_vport *vport;
        struct lpfc_hba *phba;
        struct lpfc_nodelist *ndlp;
        struct lpfc_nvme_buf *lpfc_ncmd;
        struct lpfc_nvme_rport *rport;
        struct lpfc_nvme_qhandle *lpfc_queue_info;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        uint64_t start = 0;
#endif

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        vport = lport->vport;
        phba = vport->phba;

#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        if (phba->ktime_on)
                start = ktime_get_ns();
#endif
        rport = (struct lpfc_nvme_rport *)pnvme_rport->private;
        lpfc_queue_info = (struct lpfc_nvme_qhandle *)hw_queue_handle;

        /*
         * Catch race where our node has transitioned, but the
         * transport is still transitioning.
         */
        ndlp = rport->ndlp;
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE | LOG_NVME_IOERR,
                                 "6053 rport %p, ndlp %p, DID x%06x "
                                 "ndlp not ready.\n",
                                 rport, ndlp, pnvme_rport->port_id);

                ndlp = lpfc_findnode_did(vport, pnvme_rport->port_id);
                if (!ndlp) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_IOERR,
                                         "6066 Missing node for DID %x\n",
                                         pnvme_rport->port_id);
                        ret = -ENODEV;
                        goto out_fail;
                }
        }

        /* The remote node has to be a mapped target or it's an error. */
        if ((ndlp->nlp_type & NLP_NVME_TARGET) &&
            (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE | LOG_NVME_IOERR,
                                 "6036 rport %p, DID x%06x not ready for "
                                 "IO. State x%x, Type x%x\n",
                                 rport, pnvme_rport->port_id,
                                 ndlp->nlp_state, ndlp->nlp_type);
                ret = -ENODEV;
                goto out_fail;

        }

        /* The node is shared with FCP IO, make sure the IO pending count does
         * not exceed the programmed depth.
         */
        if (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth) {
                ret = -EAGAIN;
                goto out_fail;
        }

        lpfc_ncmd = lpfc_get_nvme_buf(phba, ndlp);
        if (lpfc_ncmd == NULL) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                 "6065 driver's buffer pool is empty, "
                                 "IO failed\n");
                ret = -ENOMEM;
                goto out_fail;
        }
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        if (phba->ktime_on) {
                lpfc_ncmd->ts_cmd_start = start;
                lpfc_ncmd->ts_last_cmd = phba->ktime_last_cmd;
        }
#endif

        /*
         * Store the data needed by the driver to issue, abort, and complete
         * an IO.
         * Do not let the IO hang out forever.  There is no midlayer issuing
         * an abort so inform the FW of the maximum IO pending time.
         */
        pnvme_fcreq->private = (void *)lpfc_ncmd;
        lpfc_ncmd->nvmeCmd = pnvme_fcreq;
        lpfc_ncmd->nrport = rport;
        lpfc_ncmd->start_time = jiffies;

        lpfc_nvme_prep_io_cmd(vport, lpfc_ncmd, ndlp);
        ret = lpfc_nvme_prep_io_dma(vport, lpfc_ncmd);
        if (ret) {
                ret = -ENOMEM;
                goto out_free_nvme_buf;
        }

        atomic_inc(&ndlp->cmd_pending);

        /*
         * Issue the IO on the WQ indicated by index in the hw_queue_handle.
         * This identfier was create in our hardware queue create callback
         * routine. The driver now is dependent on the IO queue steering from
         * the transport.  We are trusting the upper NVME layers know which
         * index to use and that they have affinitized a CPU to this hardware
         * queue. A hardware queue maps to a driver MSI-X vector/EQ/CQ/WQ.
         */
        lpfc_ncmd->cur_iocbq.hba_wqidx = lpfc_queue_info->index;

        lpfc_nvmeio_data(phba, "NVME FCP XMIT: xri x%x idx %d to %06x\n",
                         lpfc_ncmd->cur_iocbq.sli4_xritag,
                         lpfc_queue_info->index, ndlp->nlp_DID);

        ret = lpfc_sli4_issue_wqe(phba, LPFC_FCP_RING, &lpfc_ncmd->cur_iocbq);
        if (ret) {
                atomic_dec(&ndlp->cmd_pending);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_IOERR,
                                 "6113 FCP could not issue WQE err %x "
                                 "sid: x%x did: x%x oxid: x%x\n",
                                 ret, vport->fc_myDID, ndlp->nlp_DID,
                                 lpfc_ncmd->cur_iocbq.sli4_xritag);
                ret = -EINVAL;
                goto out_free_nvme_buf;
        }

#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        if (phba->ktime_on)
                lpfc_ncmd->ts_cmd_wqput = ktime_get_ns();

        if (phba->cpucheck_on & LPFC_CHECK_NVME_IO) {
                lpfc_ncmd->cpu = smp_processor_id();
                if (lpfc_ncmd->cpu != lpfc_queue_info->index) {
                        /* Check for admin queue */
                        if (lpfc_queue_info->qidx) {
                                lpfc_printf_vlog(vport,
                                                 KERN_ERR, LOG_NVME_IOERR,
                                                "6702 CPU Check cmd: "
                                                "cpu %d wq %d\n",
                                                lpfc_ncmd->cpu,
                                                lpfc_queue_info->index);
                        }
                        lpfc_ncmd->cpu = lpfc_queue_info->index;
                }
                if (lpfc_ncmd->cpu < LPFC_CHECK_CPU_CNT)
                        phba->cpucheck_xmt_io[lpfc_ncmd->cpu]++;
        }
#endif
        return 0;

 out_free_nvme_buf:
        lpfc_release_nvme_buf(phba, lpfc_ncmd);
 out_fail:
        return ret;
}

/**
 * lpfc_nvme_abort_fcreq_cmpl - Complete an NVME FCP abort request.
 * @phba: Pointer to HBA context object
 * @cmdiocb: Pointer to command iocb object.
 * @rspiocb: Pointer to response iocb object.
 *
 * This is the callback function for any NVME FCP IO that was aborted.
 *
 * Return value:
 *   None
 **/
void
lpfc_nvme_abort_fcreq_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                           struct lpfc_wcqe_complete *abts_cmpl)
{
        lpfc_printf_log(phba, KERN_ERR, LOG_NVME,
                        "6145 ABORT_XRI_CN completing on rpi x%x "
                        "original iotag x%x, abort cmd iotag x%x "
                        "req_tag x%x, status x%x, hwstatus x%x\n",
                        cmdiocb->iocb.un.acxri.abortContextTag,
                        cmdiocb->iocb.un.acxri.abortIoTag,
                        cmdiocb->iotag,
                        bf_get(lpfc_wcqe_c_request_tag, abts_cmpl),
                        bf_get(lpfc_wcqe_c_status, abts_cmpl),
                        bf_get(lpfc_wcqe_c_hw_status, abts_cmpl));
        lpfc_sli_release_iocbq(phba, cmdiocb);
}

/**
 * lpfc_nvme_fcp_abort - Issue an NVME-over-FCP ABTS
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @lpfc_nvme_lport: Pointer to the driver's local port data
 * @lpfc_nvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
 * @lpfc_nvme_fcreq: IO request from nvme fc to driver.
 * @hw_queue_handle: Driver-returned handle in lpfc_nvme_create_queue
 *
 * Driver registers this routine as its nvme request io abort handler.  This
 * routine issues an fcp Abort WQE with data from the @lpfc_nvme_fcpreq
 * data structure to the rport indicated in @lpfc_nvme_rport.  This routine
 * is executed asynchronously - one the target is validated as "MAPPED" and
 * ready for IO, the driver issues the abort request and returns.
 *
 * Return value:
 *   None
 **/
static void
lpfc_nvme_fcp_abort(struct nvme_fc_local_port *pnvme_lport,
                    struct nvme_fc_remote_port *pnvme_rport,
                    void *hw_queue_handle,
                    struct nvmefc_fcp_req *pnvme_fcreq)
{
        struct lpfc_nvme_lport *lport;
        struct lpfc_vport *vport;
        struct lpfc_hba *phba;
        struct lpfc_nodelist *ndlp;
        struct lpfc_nvme_rport *rport;
        struct lpfc_nvme_buf *lpfc_nbuf;
        struct lpfc_iocbq *abts_buf;
        struct lpfc_iocbq *nvmereq_wqe;
        union lpfc_wqe *abts_wqe;
        unsigned long flags;
        int ret_val;

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        rport = (struct lpfc_nvme_rport *)pnvme_rport->private;
        vport = lport->vport;
        phba = vport->phba;

        /* Announce entry to new IO submit field. */
        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_ABTS,
                         "6002 Abort Request to rport DID x%06x "
                         "for nvme_fc_req %p\n",
                         pnvme_rport->port_id,
                         pnvme_fcreq);

        /*
         * Catch race where our node has transitioned, but the
         * transport is still transitioning.
         */
        ndlp = rport->ndlp;
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE | LOG_NVME_ABTS,
                                 "6054 rport %p, ndlp %p, DID x%06x ndlp "
                                 " not ready.\n",
                                 rport, ndlp, pnvme_rport->port_id);

                ndlp = lpfc_findnode_did(vport, pnvme_rport->port_id);
                if (!ndlp) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_ABTS,
                                         "6055 Could not find node for "
                                         "DID %x\n",
                                         pnvme_rport->port_id);
                        return;
                }
        }

        /* The remote node has to be ready to send an abort. */
        if ((ndlp->nlp_state != NLP_STE_MAPPED_NODE) &&
            !(ndlp->nlp_type & NLP_NVME_TARGET)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE | LOG_NVME_ABTS,
                                 "6048 rport %p, DID x%06x not ready for "
                                 "IO. State x%x, Type x%x\n",
                                 rport, pnvme_rport->port_id,
                                 ndlp->nlp_state, ndlp->nlp_type);
                return;
        }

        /* If the hba is getting reset, this flag is set.  It is
         * cleared when the reset is complete and rings reestablished.
         */
        spin_lock_irqsave(&phba->hbalock, flags);
        /* driver queued commands are in process of being flushed */
        if (phba->hba_flag & HBA_NVME_IOQ_FLUSH) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6139 Driver in reset cleanup - flushing "
                                 "NVME Req now.  hba_flag x%x\n",
                                 phba->hba_flag);
                return;
        }

        lpfc_nbuf = (struct lpfc_nvme_buf *)pnvme_fcreq->private;
        if (!lpfc_nbuf) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6140 NVME IO req has no matching lpfc nvme "
                                 "io buffer.  Skipping abort req.\n");
                return;
        } else if (!lpfc_nbuf->nvmeCmd) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6141 lpfc NVME IO req has no nvme_fcreq "
                                 "io buffer.  Skipping abort req.\n");
                return;
        }

        /*
         * The lpfc_nbuf and the mapped nvme_fcreq in the driver's
         * state must match the nvme_fcreq passed by the nvme
         * transport.  If they don't match, it is likely the driver
         * has already completed the NVME IO and the nvme transport
         * has not seen it yet.
         */
        if (lpfc_nbuf->nvmeCmd != pnvme_fcreq) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6143 NVME req mismatch: "
                                 "lpfc_nbuf %p nvmeCmd %p, "
                                 "pnvme_fcreq %p.  Skipping Abort\n",
                                 lpfc_nbuf, lpfc_nbuf->nvmeCmd,
                                 pnvme_fcreq);
                return;
        }

        /* Don't abort IOs no longer on the pending queue. */
        nvmereq_wqe = &lpfc_nbuf->cur_iocbq;
        if (!(nvmereq_wqe->iocb_flag & LPFC_IO_ON_TXCMPLQ)) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6142 NVME IO req %p not queued - skipping "
                                 "abort req\n",
                                 pnvme_fcreq);
                return;
        }

        lpfc_nvmeio_data(phba, "NVME FCP ABORT: xri x%x idx %d to %06x\n",
                         nvmereq_wqe->sli4_xritag,
                         nvmereq_wqe->hba_wqidx, ndlp->nlp_DID);

        /* Outstanding abort is in progress */
        if (nvmereq_wqe->iocb_flag & LPFC_DRIVER_ABORTED) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6144 Outstanding NVME I/O Abort Request "
                                 "still pending on nvme_fcreq %p, "
                                 "lpfc_ncmd %p\n",
                                 pnvme_fcreq, lpfc_nbuf);
                return;
        }

        abts_buf = __lpfc_sli_get_iocbq(phba);
        if (!abts_buf) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6136 No available abort wqes. Skipping "
                                 "Abts req for nvme_fcreq %p.\n",
                                 pnvme_fcreq);
                return;
        }

        /* Ready - mark outstanding as aborted by driver. */
        nvmereq_wqe->iocb_flag |= LPFC_DRIVER_ABORTED;

        /* Complete prepping the abort wqe and issue to the FW. */
        abts_wqe = &abts_buf->wqe;

        /* WQEs are reused.  Clear stale data and set key fields to
         * zero like ia, iaab, iaar, xri_tag, and ctxt_tag.
         */
        memset(abts_wqe, 0, sizeof(union lpfc_wqe));
        bf_set(abort_cmd_criteria, &abts_wqe->abort_cmd, T_XRI_TAG);

        /* word 7 */
        bf_set(wqe_ct, &abts_wqe->abort_cmd.wqe_com, 0);
        bf_set(wqe_cmnd, &abts_wqe->abort_cmd.wqe_com, CMD_ABORT_XRI_CX);
        bf_set(wqe_class, &abts_wqe->abort_cmd.wqe_com,
               nvmereq_wqe->iocb.ulpClass);

        /* word 8 - tell the FW to abort the IO associated with this
         * outstanding exchange ID.
         */
        abts_wqe->abort_cmd.wqe_com.abort_tag = nvmereq_wqe->sli4_xritag;

        /* word 9 - this is the iotag for the abts_wqe completion. */
        bf_set(wqe_reqtag, &abts_wqe->abort_cmd.wqe_com,
               abts_buf->iotag);

        /* word 10 */
        bf_set(wqe_wqid, &abts_wqe->abort_cmd.wqe_com, nvmereq_wqe->hba_wqidx);
        bf_set(wqe_qosd, &abts_wqe->abort_cmd.wqe_com, 1);
        bf_set(wqe_lenloc, &abts_wqe->abort_cmd.wqe_com, LPFC_WQE_LENLOC_NONE);

        /* word 11 */
        bf_set(wqe_cmd_type, &abts_wqe->abort_cmd.wqe_com, OTHER_COMMAND);
        bf_set(wqe_wqec, &abts_wqe->abort_cmd.wqe_com, 1);
        bf_set(wqe_cqid, &abts_wqe->abort_cmd.wqe_com, LPFC_WQE_CQ_ID_DEFAULT);

        /* ABTS WQE must go to the same WQ as the WQE to be aborted */
        abts_buf->iocb_flag |= LPFC_IO_NVME;
        abts_buf->hba_wqidx = nvmereq_wqe->hba_wqidx;
        abts_buf->vport = vport;
        abts_buf->wqe_cmpl = lpfc_nvme_abort_fcreq_cmpl;
        ret_val = lpfc_sli4_issue_wqe(phba, LPFC_FCP_RING, abts_buf);
        spin_unlock_irqrestore(&phba->hbalock, flags);
        if (ret_val == IOCB_ERROR) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                                 "6137 Failed abts issue_wqe with status x%x "
                                 "for nvme_fcreq %p.\n",
                                 ret_val, pnvme_fcreq);
                lpfc_sli_release_iocbq(phba, abts_buf);
                return;
        }

        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME,
                         "6138 Transport Abort NVME Request Issued for\n"
                         "ox_id x%x on reqtag x%x\n",
                         nvmereq_wqe->sli4_xritag,
                         abts_buf->iotag);
}

/* Declare and initialization an instance of the FC NVME template. */
static struct nvme_fc_port_template lpfc_nvme_template = {
        /* initiator-based functions */
        .localport_delete  = lpfc_nvme_localport_delete,
        .remoteport_delete = lpfc_nvme_remoteport_delete,
        .create_queue = lpfc_nvme_create_queue,
        .delete_queue = lpfc_nvme_delete_queue,
        .ls_req       = lpfc_nvme_ls_req,
        .fcp_io       = lpfc_nvme_fcp_io_submit,
        .ls_abort     = lpfc_nvme_ls_abort,
        .fcp_abort    = lpfc_nvme_fcp_abort,

        .max_hw_queues = 1,
        .max_sgl_segments = LPFC_NVME_DEFAULT_SEGS,
        .max_dif_sgl_segments = LPFC_NVME_DEFAULT_SEGS,
        .dma_boundary = 0xFFFFFFFF,

        /* Sizes of additional private data for data structures.
         * No use for the last two sizes at this time.
         */
        .local_priv_sz = sizeof(struct lpfc_nvme_lport),
        .remote_priv_sz = sizeof(struct lpfc_nvme_rport),
        .lsrqst_priv_sz = 0,
        .fcprqst_priv_sz = 0,
};

/**
 * lpfc_sli4_post_nvme_sgl_block - post a block of nvme sgl list to firmware
 * @phba: pointer to lpfc hba data structure.
 * @nblist: pointer to nvme buffer list.
 * @count: number of scsi buffers on the list.
 *
 * This routine is invoked to post a block of @count scsi sgl pages from a
 * SCSI buffer list @nblist to the HBA using non-embedded mailbox command.
 * No Lock is held.
 *
 **/
static int
lpfc_sli4_post_nvme_sgl_block(struct lpfc_hba *phba,
                              struct list_head *nblist,
                              int count)
{
        struct lpfc_nvme_buf *lpfc_ncmd;
        struct lpfc_mbx_post_uembed_sgl_page1 *sgl;
        struct sgl_page_pairs *sgl_pg_pairs;
        void *viraddr;
        LPFC_MBOXQ_t *mbox;
        uint32_t reqlen, alloclen, pg_pairs;
        uint32_t mbox_tmo;
        uint16_t xritag_start = 0;
        int rc = 0;
        uint32_t shdr_status, shdr_add_status;
        dma_addr_t pdma_phys_bpl1;
        union lpfc_sli4_cfg_shdr *shdr;

        /* Calculate the requested length of the dma memory */
        reqlen = count * sizeof(struct sgl_page_pairs) +
                 sizeof(union lpfc_sli4_cfg_shdr) + sizeof(uint32_t);
        if (reqlen > SLI4_PAGE_SIZE) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_INIT,
                                "6118 Block sgl registration required DMA "
                                "size (%d) great than a page\n", reqlen);
                return -ENOMEM;
        }
        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mbox) {
                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                "6119 Failed to allocate mbox cmd memory\n");
                return -ENOMEM;
        }

        /* Allocate DMA memory and set up the non-embedded mailbox command */
        alloclen = lpfc_sli4_config(phba, mbox, LPFC_MBOX_SUBSYSTEM_FCOE,
                                LPFC_MBOX_OPCODE_FCOE_POST_SGL_PAGES, reqlen,
                                LPFC_SLI4_MBX_NEMBED);

        if (alloclen < reqlen) {
                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                "6120 Allocated DMA memory size (%d) is "
                                "less than the requested DMA memory "
                                "size (%d)\n", alloclen, reqlen);
                lpfc_sli4_mbox_cmd_free(phba, mbox);
                return -ENOMEM;
        }

        /* Get the first SGE entry from the non-embedded DMA memory */
        viraddr = mbox->sge_array->addr[0];

        /* Set up the SGL pages in the non-embedded DMA pages */
        sgl = (struct lpfc_mbx_post_uembed_sgl_page1 *)viraddr;
        sgl_pg_pairs = &sgl->sgl_pg_pairs;

        pg_pairs = 0;
        list_for_each_entry(lpfc_ncmd, nblist, list) {
                /* Set up the sge entry */
                sgl_pg_pairs->sgl_pg0_addr_lo =
                        cpu_to_le32(putPaddrLow(lpfc_ncmd->dma_phys_sgl));
                sgl_pg_pairs->sgl_pg0_addr_hi =
                        cpu_to_le32(putPaddrHigh(lpfc_ncmd->dma_phys_sgl));
                if (phba->cfg_sg_dma_buf_size > SGL_PAGE_SIZE)
                        pdma_phys_bpl1 = lpfc_ncmd->dma_phys_sgl +
                                                SGL_PAGE_SIZE;
                else
                        pdma_phys_bpl1 = 0;
                sgl_pg_pairs->sgl_pg1_addr_lo =
                        cpu_to_le32(putPaddrLow(pdma_phys_bpl1));
                sgl_pg_pairs->sgl_pg1_addr_hi =
                        cpu_to_le32(putPaddrHigh(pdma_phys_bpl1));
                /* Keep the first xritag on the list */
                if (pg_pairs == 0)
                        xritag_start = lpfc_ncmd->cur_iocbq.sli4_xritag;
                sgl_pg_pairs++;
                pg_pairs++;
        }
        bf_set(lpfc_post_sgl_pages_xri, sgl, xritag_start);
        bf_set(lpfc_post_sgl_pages_xricnt, sgl, pg_pairs);
        /* Perform endian conversion if necessary */
        sgl->word0 = cpu_to_le32(sgl->word0);

        if (!phba->sli4_hba.intr_enable)
                rc = lpfc_sli_issue_mbox(phba, mbox, MBX_POLL);
        else {
                mbox_tmo = lpfc_mbox_tmo_val(phba, mbox);
                rc = lpfc_sli_issue_mbox_wait(phba, mbox, mbox_tmo);
        }
        shdr = (union lpfc_sli4_cfg_shdr *)&sgl->cfg_shdr;
        shdr_status = bf_get(lpfc_mbox_hdr_status, &shdr->response);
        shdr_add_status = bf_get(lpfc_mbox_hdr_add_status, &shdr->response);
        if (rc != MBX_TIMEOUT)
                lpfc_sli4_mbox_cmd_free(phba, mbox);
        if (shdr_status || shdr_add_status || rc) {
                lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                "6125 POST_SGL_BLOCK mailbox command failed "
                                "status x%x add_status x%x mbx status x%x\n",
                                shdr_status, shdr_add_status, rc);
                rc = -ENXIO;
        }
        return rc;
}

/**
 * lpfc_post_nvme_sgl_list - Post blocks of nvme buffer sgls from a list
 * @phba: pointer to lpfc hba data structure.
 * @post_nblist: pointer to the nvme buffer list.
 *
 * This routine walks a list of nvme buffers that was passed in. It attempts
 * to construct blocks of nvme buffer sgls which contains contiguous xris and
 * uses the non-embedded SGL block post mailbox commands to post to the port.
 * For single NVME buffer sgl with non-contiguous xri, if any, it shall use
 * embedded SGL post mailbox command for posting. The @post_nblist passed in
 * must be local list, thus no lock is needed when manipulate the list.
 *
 * Returns: 0 = failure, non-zero number of successfully posted buffers.
 **/
static int
lpfc_post_nvme_sgl_list(struct lpfc_hba *phba,
                             struct list_head *post_nblist, int sb_count)
{
        struct lpfc_nvme_buf *lpfc_ncmd, *lpfc_ncmd_next;
        int status, sgl_size;
        int post_cnt = 0, block_cnt = 0, num_posting = 0, num_posted = 0;
        dma_addr_t pdma_phys_sgl1;
        int last_xritag = NO_XRI;
        int cur_xritag;
        LIST_HEAD(prep_nblist);
        LIST_HEAD(blck_nblist);
        LIST_HEAD(nvme_nblist);

        /* sanity check */
        if (sb_count <= 0)
                return -EINVAL;

        sgl_size = phba->cfg_sg_dma_buf_size;

        list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next, post_nblist, list) {
                list_del_init(&lpfc_ncmd->list);
                block_cnt++;
                if ((last_xritag != NO_XRI) &&
                    (lpfc_ncmd->cur_iocbq.sli4_xritag != last_xritag + 1)) {
                        /* a hole in xri block, form a sgl posting block */
                        list_splice_init(&prep_nblist, &blck_nblist);
                        post_cnt = block_cnt - 1;
                        /* prepare list for next posting block */
                        list_add_tail(&lpfc_ncmd->list, &prep_nblist);
                        block_cnt = 1;
                } else {
                        /* prepare list for next posting block */
                        list_add_tail(&lpfc_ncmd->list, &prep_nblist);
                        /* enough sgls for non-embed sgl mbox command */
                        if (block_cnt == LPFC_NEMBED_MBOX_SGL_CNT) {
                                list_splice_init(&prep_nblist, &blck_nblist);
                                post_cnt = block_cnt;
                                block_cnt = 0;
                        }
                }
                num_posting++;
                last_xritag = lpfc_ncmd->cur_iocbq.sli4_xritag;

                /* end of repost sgl list condition for NVME buffers */
                if (num_posting == sb_count) {
                        if (post_cnt == 0) {
                                /* last sgl posting block */
                                list_splice_init(&prep_nblist, &blck_nblist);
                                post_cnt = block_cnt;
                        } else if (block_cnt == 1) {
                                /* last single sgl with non-contiguous xri */
                                if (sgl_size > SGL_PAGE_SIZE)
                                        pdma_phys_sgl1 =
                                                lpfc_ncmd->dma_phys_sgl +
                                                SGL_PAGE_SIZE;
                                else
                                        pdma_phys_sgl1 = 0;
                                cur_xritag = lpfc_ncmd->cur_iocbq.sli4_xritag;
                                status = lpfc_sli4_post_sgl(phba,
                                                lpfc_ncmd->dma_phys_sgl,
                                                pdma_phys_sgl1, cur_xritag);
                                if (status) {
                                        /* failure, put on abort nvme list */
                                        lpfc_ncmd->exch_busy = 1;
                                } else {
                                        /* success, put on NVME buffer list */
                                        lpfc_ncmd->exch_busy = 0;
                                        lpfc_ncmd->status = IOSTAT_SUCCESS;
                                        num_posted++;
                                }
                                /* success, put on NVME buffer sgl list */
                                list_add_tail(&lpfc_ncmd->list, &nvme_nblist);
                        }
                }

                /* continue until a nembed page worth of sgls */
                if (post_cnt == 0)
                        continue;

                /* post block of NVME buffer list sgls */
                status = lpfc_sli4_post_nvme_sgl_block(phba, &blck_nblist,
                                                       post_cnt);

                /* don't reset xirtag due to hole in xri block */
                if (block_cnt == 0)
                        last_xritag = NO_XRI;

                /* reset NVME buffer post count for next round of posting */
                post_cnt = 0;

                /* put posted NVME buffer-sgl posted on NVME buffer sgl list */
                while (!list_empty(&blck_nblist)) {
                        list_remove_head(&blck_nblist, lpfc_ncmd,
                                         struct lpfc_nvme_buf, list);
                        if (status) {
                                /* failure, put on abort nvme list */
                                lpfc_ncmd->exch_busy = 1;
                        } else {
                                /* success, put on NVME buffer list */
                                lpfc_ncmd->exch_busy = 0;
                                lpfc_ncmd->status = IOSTAT_SUCCESS;
                                num_posted++;
                        }
                        list_add_tail(&lpfc_ncmd->list, &nvme_nblist);
                }
        }
        /* Push NVME buffers with sgl posted to the available list */
        while (!list_empty(&nvme_nblist)) {
                list_remove_head(&nvme_nblist, lpfc_ncmd,
                                 struct lpfc_nvme_buf, list);
                lpfc_release_nvme_buf(phba, lpfc_ncmd);
        }
        return num_posted;
}

/**
 * lpfc_repost_nvme_sgl_list - Repost all the allocated nvme buffer sgls
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine walks the list of nvme buffers that have been allocated and
 * repost them to the port by using SGL block post. This is needed after a
 * pci_function_reset/warm_start or start. The lpfc_hba_down_post_s4 routine
 * is responsible for moving all nvme buffers on the lpfc_abts_nvme_sgl_list
 * to the lpfc_nvme_buf_list. If the repost fails, reject all nvme buffers.
 *
 * Returns: 0 = success, non-zero failure.
 **/
int
lpfc_repost_nvme_sgl_list(struct lpfc_hba *phba)
{
        LIST_HEAD(post_nblist);
        int num_posted, rc = 0;

        /* get all NVME buffers need to repost to a local list */
        spin_lock_irq(&phba->nvme_buf_list_get_lock);
        spin_lock(&phba->nvme_buf_list_put_lock);
        list_splice_init(&phba->lpfc_nvme_buf_list_get, &post_nblist);
        list_splice(&phba->lpfc_nvme_buf_list_put, &post_nblist);
        spin_unlock(&phba->nvme_buf_list_put_lock);
        spin_unlock_irq(&phba->nvme_buf_list_get_lock);

        /* post the list of nvme buffer sgls to port if available */
        if (!list_empty(&post_nblist)) {
                num_posted = lpfc_post_nvme_sgl_list(phba, &post_nblist,
                                                phba->sli4_hba.nvme_xri_cnt);
                /* failed to post any nvme buffer, return error */
                if (num_posted == 0)
                        rc = -EIO;
        }
        return rc;
}

/**
 * lpfc_new_nvme_buf - Scsi buffer allocator for HBA with SLI4 IF spec
 * @vport: The virtual port for which this call being executed.
 * @num_to_allocate: The requested number of buffers to allocate.
 *
 * This routine allocates nvme buffers for device with SLI-4 interface spec,
 * the nvme buffer contains all the necessary information needed to initiate
 * a NVME I/O. After allocating up to @num_to_allocate NVME buffers and put
 * them on a list, it post them to the port by using SGL block post.
 *
 * Return codes:
 *   int - number of nvme buffers that were allocated and posted.
 *   0 = failure, less than num_to_alloc is a partial failure.
 **/
static int
lpfc_new_nvme_buf(struct lpfc_vport *vport, int num_to_alloc)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_nvme_buf *lpfc_ncmd;
        struct lpfc_iocbq *pwqeq;
        union lpfc_wqe128 *wqe;
        struct sli4_sge *sgl;
        dma_addr_t pdma_phys_sgl;
        uint16_t iotag, lxri = 0;
        int bcnt, num_posted, sgl_size;
        LIST_HEAD(prep_nblist);
        LIST_HEAD(post_nblist);
        LIST_HEAD(nvme_nblist);

        sgl_size = phba->cfg_sg_dma_buf_size;

        for (bcnt = 0; bcnt < num_to_alloc; bcnt++) {
                lpfc_ncmd = kzalloc(sizeof(struct lpfc_nvme_buf), GFP_KERNEL);
                if (!lpfc_ncmd)
                        break;
                /*
                 * Get memory from the pci pool to map the virt space to
                 * pci bus space for an I/O. The DMA buffer includes the
                 * number of SGE's necessary to support the sg_tablesize.
                 */
                lpfc_ncmd->data = pci_pool_alloc(phba->lpfc_sg_dma_buf_pool,
                                                 GFP_KERNEL,
                                                 &lpfc_ncmd->dma_handle);
                if (!lpfc_ncmd->data) {
                        kfree(lpfc_ncmd);
                        break;
                }
                memset(lpfc_ncmd->data, 0, phba->cfg_sg_dma_buf_size);

                lxri = lpfc_sli4_next_xritag(phba);
                if (lxri == NO_XRI) {
                        pci_pool_free(phba->lpfc_sg_dma_buf_pool,
                                      lpfc_ncmd->data, lpfc_ncmd->dma_handle);
                        kfree(lpfc_ncmd);
                        break;
                }
                pwqeq = &(lpfc_ncmd->cur_iocbq);
                wqe = (union lpfc_wqe128 *)&pwqeq->wqe;

                /* Allocate iotag for lpfc_ncmd->cur_iocbq. */
                iotag = lpfc_sli_next_iotag(phba, pwqeq);
                if (iotag == 0) {
                        pci_pool_free(phba->lpfc_sg_dma_buf_pool,
                                      lpfc_ncmd->data, lpfc_ncmd->dma_handle);
                        kfree(lpfc_ncmd);
                        lpfc_printf_log(phba, KERN_ERR, LOG_NVME_IOERR,
                                        "6121 Failed to allocated IOTAG for"
                                        " XRI:0x%x\n", lxri);
                        lpfc_sli4_free_xri(phba, lxri);
                        break;
                }
                pwqeq->sli4_lxritag = lxri;
                pwqeq->sli4_xritag = phba->sli4_hba.xri_ids[lxri];
                pwqeq->iocb_flag |= LPFC_IO_NVME;
                pwqeq->context1 = lpfc_ncmd;
                pwqeq->wqe_cmpl = lpfc_nvme_io_cmd_wqe_cmpl;

                /* Initialize local short-hand pointers. */
                lpfc_ncmd->nvme_sgl = lpfc_ncmd->data;
                sgl = lpfc_ncmd->nvme_sgl;
                pdma_phys_sgl = lpfc_ncmd->dma_handle;
                lpfc_ncmd->dma_phys_sgl = pdma_phys_sgl;

                /* Rsp SGE will be filled in when we rcv an IO
                 * from the NVME Layer to be sent.
                 * The cmd is going to be embedded so we need a SKIP SGE.
                 */
                bf_set(lpfc_sli4_sge_type, sgl, LPFC_SGE_TYPE_SKIP);
                bf_set(lpfc_sli4_sge_last, sgl, 0);
                sgl->word2 = cpu_to_le32(sgl->word2);
                /* Fill in word 3 / sgl_len during cmd submission */

                lpfc_ncmd->cur_iocbq.context1 = lpfc_ncmd;

                /* Word 7 */
                bf_set(wqe_erp, &wqe->generic.wqe_com, 0);
                /* NVME upper layers will time things out, if needed */
                bf_set(wqe_tmo, &wqe->generic.wqe_com, 0);

                /* Word 10 */
                bf_set(wqe_ebde_cnt, &wqe->generic.wqe_com, 0);
                bf_set(wqe_dbde, &wqe->generic.wqe_com, 1);

                /* add the nvme buffer to a post list */
                list_add_tail(&lpfc_ncmd->list, &post_nblist);
                spin_lock_irq(&phba->nvme_buf_list_get_lock);
                phba->sli4_hba.nvme_xri_cnt++;
                spin_unlock_irq(&phba->nvme_buf_list_get_lock);
        }
        lpfc_printf_log(phba, KERN_INFO, LOG_NVME,
                        "6114 Allocate %d out of %d requested new NVME "
                        "buffers\n", bcnt, num_to_alloc);

        /* post the list of nvme buffer sgls to port if available */
        if (!list_empty(&post_nblist))
                num_posted = lpfc_post_nvme_sgl_list(phba,
                                                     &post_nblist, bcnt);
        else
                num_posted = 0;

        return num_posted;
}

/**
 * lpfc_get_nvme_buf - Get a nvme buffer from lpfc_nvme_buf_list of the HBA
 * @phba: The HBA for which this call is being executed.
 *
 * This routine removes a nvme buffer from head of @phba lpfc_nvme_buf_list list
 * and returns to caller.
 *
 * Return codes:
 *   NULL - Error
 *   Pointer to lpfc_nvme_buf - Success
 **/
static struct lpfc_nvme_buf *
lpfc_get_nvme_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp)
{
        struct lpfc_nvme_buf *lpfc_ncmd, *lpfc_ncmd_next;
        unsigned long iflag = 0;
        int found = 0;

        spin_lock_irqsave(&phba->nvme_buf_list_get_lock, iflag);
        list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next,
                                 &phba->lpfc_nvme_buf_list_get, list) {
                if (lpfc_test_rrq_active(phba, ndlp,
                                         lpfc_ncmd->cur_iocbq.sli4_lxritag))
                        continue;
                list_del(&lpfc_ncmd->list);
                found = 1;
                break;
        }
        if (!found) {
                spin_lock(&phba->nvme_buf_list_put_lock);
                list_splice(&phba->lpfc_nvme_buf_list_put,
                            &phba->lpfc_nvme_buf_list_get);
                INIT_LIST_HEAD(&phba->lpfc_nvme_buf_list_put);
                spin_unlock(&phba->nvme_buf_list_put_lock);
                list_for_each_entry_safe(lpfc_ncmd, lpfc_ncmd_next,
                                         &phba->lpfc_nvme_buf_list_get, list) {
                        if (lpfc_test_rrq_active(
                                phba, ndlp, lpfc_ncmd->cur_iocbq.sli4_lxritag))
                                continue;
                        list_del(&lpfc_ncmd->list);
                        found = 1;
                        break;
                }
        }
        spin_unlock_irqrestore(&phba->nvme_buf_list_get_lock, iflag);
        if (!found)
                return NULL;
        return  lpfc_ncmd;
}

/**
 * lpfc_release_nvme_buf: Return a nvme buffer back to hba nvme buf list.
 * @phba: The Hba for which this call is being executed.
 * @lpfc_ncmd: The nvme buffer which is being released.
 *
 * This routine releases @lpfc_ncmd nvme buffer by adding it to tail of @phba
 * lpfc_nvme_buf_list list. For SLI4 XRI's are tied to the nvme buffer
 * and cannot be reused for at least RA_TOV amount of time if it was
 * aborted.
 **/
static void
lpfc_release_nvme_buf(struct lpfc_hba *phba, struct lpfc_nvme_buf *lpfc_ncmd)
{
        unsigned long iflag = 0;

        lpfc_ncmd->nonsg_phys = 0;
        if (lpfc_ncmd->exch_busy) {
                spin_lock_irqsave(&phba->sli4_hba.abts_nvme_buf_list_lock,
                                        iflag);
                lpfc_ncmd->nvmeCmd = NULL;
                list_add_tail(&lpfc_ncmd->list,
                        &phba->sli4_hba.lpfc_abts_nvme_buf_list);
                spin_unlock_irqrestore(&phba->sli4_hba.abts_nvme_buf_list_lock,
                                        iflag);
        } else {
                lpfc_ncmd->nvmeCmd = NULL;
                lpfc_ncmd->cur_iocbq.iocb_flag = LPFC_IO_NVME;
                spin_lock_irqsave(&phba->nvme_buf_list_put_lock, iflag);
                list_add_tail(&lpfc_ncmd->list, &phba->lpfc_nvme_buf_list_put);
                spin_unlock_irqrestore(&phba->nvme_buf_list_put_lock, iflag);
        }
}

/**
 * lpfc_nvme_create_localport - Create/Bind an nvme localport instance.
 * @pvport - the lpfc_vport instance requesting a localport.
 *
 * This routine is invoked to create an nvme localport instance to bind
 * to the nvme_fc_transport.  It is called once during driver load
 * like lpfc_create_shost after all other services are initialized.
 * It requires a vport, vpi, and wwns at call time.  Other localport
 * parameters are modified as the driver's FCID and the Fabric WWN
 * are established.
 *
 * Return codes
 *      0 - successful
 *      -ENOMEM - no heap memory available
 *      other values - from nvme registration upcall
 **/
int
lpfc_nvme_create_localport(struct lpfc_vport *vport)
{
        struct lpfc_hba  *phba = vport->phba;
        struct nvme_fc_port_info nfcp_info;
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;
        int len, ret = 0;

        /* Initialize this localport instance.  The vport wwn usage ensures
         * that NPIV is accounted for.
         */
        memset(&nfcp_info, 0, sizeof(struct nvme_fc_port_info));
        nfcp_info.port_role = FC_PORT_ROLE_NVME_INITIATOR;
        nfcp_info.node_name = wwn_to_u64(vport->fc_nodename.u.wwn);
        nfcp_info.port_name = wwn_to_u64(vport->fc_portname.u.wwn);

        /* For now need + 1 to get around NVME transport logic */
        lpfc_nvme_template.max_sgl_segments = phba->cfg_sg_seg_cnt + 1;
        lpfc_nvme_template.max_hw_queues = phba->cfg_nvme_io_channel;

        /* localport is allocated from the stack, but the registration
         * call allocates heap memory as well as the private area.
         */
        ret = nvme_fc_register_localport(&nfcp_info, &lpfc_nvme_template,
                                         &vport->phba->pcidev->dev, &localport);
        if (!ret) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME | LOG_NVME_DISC,
                                 "6005 Successfully registered local "
                                 "NVME port num %d, localP %p, private %p, "
                                 "sg_seg %d\n",
                                 localport->port_num, localport,
                                 localport->private,
                                 lpfc_nvme_template.max_sgl_segments);

                /* Private is our lport size declared in the template. */
                lport = (struct lpfc_nvme_lport *)localport->private;
                vport->localport = localport;
                lport->vport = vport;
                INIT_LIST_HEAD(&lport->rport_list);
                vport->nvmei_support = 1;
        }

        len  = lpfc_new_nvme_buf(vport, phba->sli4_hba.nvme_xri_max);
        vport->phba->total_nvme_bufs += len;
        return ret;
}

/**
 * lpfc_nvme_destroy_localport - Destroy lpfc_nvme bound to nvme transport.
 * @pnvme: pointer to lpfc nvme data structure.
 *
 * This routine is invoked to destroy all lports bound to the phba.
 * The lport memory was allocated by the nvme fc transport and is
 * released there.  This routine ensures all rports bound to the
 * lport have been disconnected.
 *
 **/
void
lpfc_nvme_destroy_localport(struct lpfc_vport *vport)
{
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;
        struct lpfc_nvme_rport *rport = NULL, *rport_next = NULL;
        int ret;

        if (vport->nvmei_support == 0)
                return;

        localport = vport->localport;
        vport->localport = NULL;
        lport = (struct lpfc_nvme_lport *)localport->private;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME,
                         "6011 Destroying NVME localport %p\n",
                         localport);

        list_for_each_entry_safe(rport, rport_next, &lport->rport_list, list) {
                /* The last node ref has to get released now before the rport
                 * private memory area is released by the transport.
                 */
                list_del(&rport->list);

                init_completion(&rport->rport_unreg_done);
                ret = nvme_fc_unregister_remoteport(rport->remoteport);
                if (ret)
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                                         "6008 rport fail destroy %x\n", ret);
                wait_for_completion_timeout(&rport->rport_unreg_done, 5);
        }
        /* lport's rport list is clear.  Unregister
         * lport and release resources.
         */
        init_completion(&lport->lport_unreg_done);
        ret = nvme_fc_unregister_localport(localport);
        wait_for_completion_timeout(&lport->lport_unreg_done, 5);

        /* Regardless of the unregister upcall response, clear
         * nvmei_support.  All rports are unregistered and the
         * driver will clean up.
         */
        vport->nvmei_support = 0;
        if (ret == 0) {
                lpfc_printf_vlog(vport,
                                 KERN_INFO, LOG_NVME_DISC,
                                 "6009 Unregistered lport Success\n");
        } else {
                lpfc_printf_vlog(vport,
                                 KERN_INFO, LOG_NVME_DISC,
                                 "6010 Unregistered lport "
                                 "Failed, status x%x\n",
                                 ret);
        }
}

void
lpfc_nvme_update_localport(struct lpfc_vport *vport)
{
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;

        localport = vport->localport;
        lport = (struct lpfc_nvme_lport *)localport->private;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME,
                         "6012 Update NVME lport %p did x%x\n",
                         localport, vport->fc_myDID);

        localport->port_id = vport->fc_myDID;
        if (localport->port_id == 0)
                localport->port_role = FC_PORT_ROLE_NVME_DISCOVERY;
        else
                localport->port_role = FC_PORT_ROLE_NVME_INITIATOR;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6030 bound lport %p to DID x%06x\n",
                         lport, localport->port_id);

}

int
lpfc_nvme_register_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
{
        int ret = 0;
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;
        struct lpfc_nvme_rport *rport;
        struct nvme_fc_remote_port *remote_port;
        struct nvme_fc_port_info rpinfo;

        lpfc_printf_vlog(ndlp->vport, KERN_INFO, LOG_NVME_DISC,
                         "6006 Register NVME PORT. DID x%06x nlptype x%x\n",
                         ndlp->nlp_DID, ndlp->nlp_type);

        localport = vport->localport;
        lport = (struct lpfc_nvme_lport *)localport->private;

        if (ndlp->nlp_type & (NLP_NVME_TARGET | NLP_NVME_INITIATOR)) {

                /* The driver isn't expecting the rport wwn to change
                 * but it might get a different DID on a different
                 * fabric.
                 */
                list_for_each_entry(rport, &lport->rport_list, list) {
                        if (rport->remoteport->port_name !=
                            wwn_to_u64(ndlp->nlp_portname.u.wwn))
                                continue;
                        lpfc_printf_vlog(ndlp->vport, KERN_INFO, LOG_NVME_DISC,
                                         "6035 lport %p, found matching rport "
                                         "at wwpn 0x%llx, Data: x%x x%x x%x "
                                         "x%06x\n",
                                         lport,
                                         rport->remoteport->port_name,
                                         rport->remoteport->port_id,
                                         rport->remoteport->port_role,
                                         ndlp->nlp_type,
                                         ndlp->nlp_DID);
                        remote_port = rport->remoteport;
                        if ((remote_port->port_id == 0) &&
                            (remote_port->port_role ==
                             FC_PORT_ROLE_NVME_DISCOVERY)) {
                                remote_port->port_id = ndlp->nlp_DID;
                                remote_port->port_role &=
                                        ~FC_PORT_ROLE_NVME_DISCOVERY;
                                if (ndlp->nlp_type & NLP_NVME_TARGET)
                                        remote_port->port_role |=
                                                FC_PORT_ROLE_NVME_TARGET;
                                if (ndlp->nlp_type & NLP_NVME_INITIATOR)
                                        remote_port->port_role |=
                                                FC_PORT_ROLE_NVME_INITIATOR;

                                lpfc_printf_vlog(ndlp->vport, KERN_INFO,
                                                 LOG_NVME_DISC,
                                                 "6014 Rebinding lport to "
                                                 "rport wwpn 0x%llx, "
                                                 "Data: x%x x%x x%x x%06x\n",
                                                 remote_port->port_name,
                                                 remote_port->port_id,
                                                 remote_port->port_role,
                                                 ndlp->nlp_type,
                                                 ndlp->nlp_DID);
                        }
                        return 0;
                }

                /* NVME rports are not preserved across devloss.
                 * Just register this instance.
                 */
                rpinfo.port_id = ndlp->nlp_DID;
                rpinfo.port_role = 0;
                if (ndlp->nlp_type & NLP_NVME_TARGET)
                        rpinfo.port_role |= FC_PORT_ROLE_NVME_TARGET;
                if (ndlp->nlp_type & NLP_NVME_INITIATOR)
                        rpinfo.port_role |= FC_PORT_ROLE_NVME_INITIATOR;
                rpinfo.port_name = wwn_to_u64(ndlp->nlp_portname.u.wwn);
                rpinfo.node_name = wwn_to_u64(ndlp->nlp_nodename.u.wwn);

                ret = nvme_fc_register_remoteport(localport, &rpinfo,
                                                  &remote_port);
                if (!ret) {
                        rport = remote_port->private;
                        rport->remoteport = remote_port;
                        rport->lport = lport;
                        rport->ndlp = lpfc_nlp_get(ndlp);
                        if (!rport->ndlp)
                                return -1;
                        ndlp->nrport = rport;
                        INIT_LIST_HEAD(&rport->list);
                        list_add_tail(&rport->list, &lport->rport_list);
                        lpfc_printf_vlog(vport, KERN_INFO,
                                         LOG_NVME_DISC | LOG_NODE,
                                         "6022 Binding new rport to lport %p "
                                         "Rport WWNN 0x%llx, Rport WWPN 0x%llx "
                                         "DID x%06x Role x%x\n",
                                         lport,
                                         rpinfo.node_name, rpinfo.port_name,
                                         rpinfo.port_id, rpinfo.port_role);
                } else {
                        lpfc_printf_vlog(vport, KERN_ERR,
                                         LOG_NVME_DISC | LOG_NODE,
                                         "6031 RemotePort Registration failed "
                                         "err: %d, DID x%06x\n",
                                         ret, ndlp->nlp_DID);
                }
        } else {
                ret = -EINVAL;
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                                 "6027 Unknown nlp_type x%x on DID x%06x "
                                 "ndlp %p.  Not Registering nvme rport\n",
                                 ndlp->nlp_type, ndlp->nlp_DID, ndlp);
        }
        return ret;
}

/* lpfc_nvme_unregister_port - unbind the DID and port_role from this rport.
 *
 * There is no notion of Devloss or rport recovery from the current
 * nvme_transport perspective.  Loss of an rport just means IO cannot
 * be sent and recovery is completely up to the initator.
 * For now, the driver just unbinds the DID and port_role so that
 * no further IO can be issued.  Changes are planned for later.
 *
 * Notes - the ndlp reference count is not decremented here since
 * since there is no nvme_transport api for devloss.  Node ref count
 * is only adjusted in driver unload.
 */
void
lpfc_nvme_unregister_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
{
        int ret;
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;
        struct lpfc_nvme_rport *rport;
        struct nvme_fc_remote_port *remoteport;

        localport = vport->localport;

        /* This is fundamental error.  The localport is always
         * available until driver unload.  Just exit.
         */
        if (!localport)
                return;

        lport = (struct lpfc_nvme_lport *)localport->private;
        if (!lport)
                goto input_err;

        rport = ndlp->nrport;
        if (!rport)
                goto input_err;

        remoteport = rport->remoteport;
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6033 Unreg nvme remoteport %p, portname x%llx, "
                         "port_id x%06x, portstate x%x port type x%x\n",
                         remoteport, remoteport->port_name,
                         remoteport->port_id, remoteport->port_state,
                         ndlp->nlp_type);

        /* Sanity check ndlp type.  Only call for NVME ports. Don't
         * clear any rport state until the transport calls back.
         */
        if (ndlp->nlp_type & (NLP_NVME_TARGET | NLP_NVME_INITIATOR)) {
                init_completion(&rport->rport_unreg_done);
                ret = nvme_fc_unregister_remoteport(remoteport);
                if (ret != 0) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                                         "6167 NVME unregister failed %d "
                                         "port_state x%x\n",
                                         ret, remoteport->port_state);
                }

                /* Wait for the driver's delete completion routine to finish
                 * before proceeding.  This guarantees the transport and driver
                 * have completed the unreg process.
                 */
                ret = wait_for_completion_timeout(&rport->rport_unreg_done, 5);
                if (ret == 0) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                                         "6169 Unreg nvme wait failed %d\n",
                                         ret);
                }
        }
        return;

 input_err:
        lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
                         "6168: State error: lport %p, rport%p FCID x%06x\n",
                         vport->localport, ndlp->rport, ndlp->nlp_DID);
}