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

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

static struct nvme_fc_port_template lpfc_nvme_template;

static union lpfc_wqe128 lpfc_iread_cmd_template;
static union lpfc_wqe128 lpfc_iwrite_cmd_template;
static union lpfc_wqe128 lpfc_icmnd_cmd_template;

/* Setup WQE templates for NVME IOs */
void
lpfc_nvme_cmd_template(void)
{
        union lpfc_wqe128 *wqe;

        /* IREAD template */
        wqe = &lpfc_iread_cmd_template;
        memset(wqe, 0, sizeof(union lpfc_wqe128));

        /* Word 0, 1, 2 - BDE is variable */

        /* Word 3 - cmd_buff_len, payload_offset_len is zero */

        /* Word 4 - total_xfer_len is variable */

        /* Word 5 - is zero */

        /* Word 6 - ctxt_tag, xri_tag is variable */

        /* Word 7 */
        bf_set(wqe_cmnd, &wqe->fcp_iread.wqe_com, CMD_FCP_IREAD64_WQE);
        bf_set(wqe_pu, &wqe->fcp_iread.wqe_com, PARM_READ_CHECK);
        bf_set(wqe_class, &wqe->fcp_iread.wqe_com, CLASS3);
        bf_set(wqe_ct, &wqe->fcp_iread.wqe_com, SLI4_CT_RPI);

        /* Word 8 - abort_tag is variable */

        /* Word 9  - reqtag is variable */

        /* Word 10 - dbde, wqes is variable */
        bf_set(wqe_qosd, &wqe->fcp_iread.wqe_com, 0);
        bf_set(wqe_nvme, &wqe->fcp_iread.wqe_com, 1);
        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);
        bf_set(wqe_dbde, &wqe->fcp_iread.wqe_com, 0);
        bf_set(wqe_wqes, &wqe->fcp_iread.wqe_com, 1);

        /* Word 11 - pbde is variable */
        bf_set(wqe_cmd_type, &wqe->fcp_iread.wqe_com, NVME_READ_CMD);
        bf_set(wqe_cqid, &wqe->fcp_iread.wqe_com, LPFC_WQE_CQ_ID_DEFAULT);
        bf_set(wqe_pbde, &wqe->fcp_iread.wqe_com, 1);

        /* Word 12 - is zero */

        /* Word 13, 14, 15 - PBDE is variable */

        /* IWRITE template */
        wqe = &lpfc_iwrite_cmd_template;
        memset(wqe, 0, sizeof(union lpfc_wqe128));

        /* Word 0, 1, 2 - BDE is variable */

        /* Word 3 - cmd_buff_len, payload_offset_len is zero */

        /* Word 4 - total_xfer_len is variable */

        /* Word 5 - initial_xfer_len is variable */

        /* Word 6 - ctxt_tag, xri_tag is variable */

        /* Word 7 */
        bf_set(wqe_cmnd, &wqe->fcp_iwrite.wqe_com, CMD_FCP_IWRITE64_WQE);
        bf_set(wqe_pu, &wqe->fcp_iwrite.wqe_com, PARM_READ_CHECK);
        bf_set(wqe_class, &wqe->fcp_iwrite.wqe_com, CLASS3);
        bf_set(wqe_ct, &wqe->fcp_iwrite.wqe_com, SLI4_CT_RPI);

        /* Word 8 - abort_tag is variable */

        /* Word 9  - reqtag is variable */

        /* Word 10 - dbde, wqes is variable */
        bf_set(wqe_qosd, &wqe->fcp_iwrite.wqe_com, 0);
        bf_set(wqe_nvme, &wqe->fcp_iwrite.wqe_com, 1);
        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);
        bf_set(wqe_dbde, &wqe->fcp_iwrite.wqe_com, 0);
        bf_set(wqe_wqes, &wqe->fcp_iwrite.wqe_com, 1);

        /* Word 11 - pbde is variable */
        bf_set(wqe_cmd_type, &wqe->fcp_iwrite.wqe_com, NVME_WRITE_CMD);
        bf_set(wqe_cqid, &wqe->fcp_iwrite.wqe_com, LPFC_WQE_CQ_ID_DEFAULT);
        bf_set(wqe_pbde, &wqe->fcp_iwrite.wqe_com, 1);

        /* Word 12 - is zero */

        /* Word 13, 14, 15 - PBDE is variable */

        /* ICMND template */
        wqe = &lpfc_icmnd_cmd_template;
        memset(wqe, 0, sizeof(union lpfc_wqe128));

        /* Word 0, 1, 2 - BDE is variable */

        /* Word 3 - payload_offset_len is variable */

        /* Word 4, 5 - is zero */

        /* Word 6 - ctxt_tag, xri_tag is variable */

        /* Word 7 */
        bf_set(wqe_cmnd, &wqe->fcp_icmd.wqe_com, CMD_FCP_ICMND64_WQE);
        bf_set(wqe_pu, &wqe->fcp_icmd.wqe_com, 0);
        bf_set(wqe_class, &wqe->fcp_icmd.wqe_com, CLASS3);
        bf_set(wqe_ct, &wqe->fcp_icmd.wqe_com, SLI4_CT_RPI);

        /* Word 8 - abort_tag is variable */

        /* Word 9  - reqtag is variable */

        /* Word 10 - dbde, wqes is variable */
        bf_set(wqe_qosd, &wqe->fcp_icmd.wqe_com, 1);
        bf_set(wqe_nvme, &wqe->fcp_icmd.wqe_com, 1);
        bf_set(wqe_iod, &wqe->fcp_icmd.wqe_com, LPFC_WQE_IOD_NONE);
        bf_set(wqe_lenloc, &wqe->fcp_icmd.wqe_com, LPFC_WQE_LENLOC_NONE);
        bf_set(wqe_dbde, &wqe->fcp_icmd.wqe_com, 0);
        bf_set(wqe_wqes, &wqe->fcp_icmd.wqe_com, 1);

        /* Word 11 */
        bf_set(wqe_cmd_type, &wqe->fcp_icmd.wqe_com, FCP_COMMAND);
        bf_set(wqe_cqid, &wqe->fcp_icmd.wqe_com, LPFC_WQE_CQ_ID_DEFAULT);
        bf_set(wqe_pbde, &wqe->fcp_icmd.wqe_com, 0);

        /* Word 12, 13, 14, 15 - is zero */
}

/**
 * lpfc_nvme_prep_abort_wqe - set up 'abort' work queue entry.
 * @pwqeq: Pointer to command iocb.
 * @xritag: Tag that  uniqely identifies the local exchange resource.
 * @opt: Option bits -
 *              bit 0 = inhibit sending abts on the link
 *
 * This function is called with hbalock held.
 **/
void
lpfc_nvme_prep_abort_wqe(struct lpfc_iocbq *pwqeq, u16 xritag, u8 opt)
{
        union lpfc_wqe128 *wqe = &pwqeq->wqe;

        /* WQEs are reused.  Clear stale data and set key fields to
         * zero like ia, iaab, iaar, xri_tag, and ctxt_tag.
         */
        memset(wqe, 0, sizeof(*wqe));

        if (opt & INHIBIT_ABORT)
                bf_set(abort_cmd_ia, &wqe->abort_cmd, 1);
        /* Abort specified xri tag, with the mask deliberately zeroed */
        bf_set(abort_cmd_criteria, &wqe->abort_cmd, T_XRI_TAG);

        bf_set(wqe_cmnd, &wqe->abort_cmd.wqe_com, CMD_ABORT_XRI_CX);

        /* Abort the IO associated with this outstanding exchange ID. */
        wqe->abort_cmd.wqe_com.abort_tag = xritag;

        /* iotag for the wqe completion. */
        bf_set(wqe_reqtag, &wqe->abort_cmd.wqe_com, pwqeq->iotag);

        bf_set(wqe_qosd, &wqe->abort_cmd.wqe_com, 1);
        bf_set(wqe_lenloc, &wqe->abort_cmd.wqe_com, LPFC_WQE_LENLOC_NONE);

        bf_set(wqe_cmd_type, &wqe->abort_cmd.wqe_com, OTHER_COMMAND);
        bf_set(wqe_wqec, &wqe->abort_cmd.wqe_com, 1);
        bf_set(wqe_cqid, &wqe->abort_cmd.wqe_com, LPFC_WQE_CQ_ID_DEFAULT);
}

/**
 * lpfc_nvme_create_queue -
 * @pnvme_lport: Transport localport that LS is to be issued from
 * @lpfc_pnvme: Pointer to the driver's nvme instance data
 * @qidx: An cpu index used to affinitize IO queues and MSIX vectors.
 * @qsize: Size of the queue in bytes
 * @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;

        if (!pnvme_lport->private)
                return -ENOMEM;

        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 = raw_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) %
                        lpfc_nvme_template.max_hw_queues);
        } else {
                str = "ADM";  /* Admin queue */
                qhandle->index = qidx;
        }

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

/**
 * lpfc_nvme_delete_queue -
 * @pnvme_lport: Transport localport that LS is to be issued from
 * @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;

        if (!pnvme_lport->private)
                return;

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

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME,
                        "6001 ENTER.  lpfc_pnvme x%px, qidx x%x qhandle x%px\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;

        lpfc_printf_vlog(lport->vport, KERN_INFO, LOG_NVME,
                         "6173 localport x%px delete complete\n",
                         lport);

        /* release any threads waiting for the unreg to complete */
        if (lport->vport->localport)
                complete(lport->lport_unreg_cmp);
}

/* 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
 */
static 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.
         */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                        "6146 remoteport delete of remoteport x%px\n",
                        remoteport);
        spin_lock_irq(&vport->phba->hbalock);

        /* The register rebind might have occurred before the delete
         * downcall.  Guard against this race.
         */
        if (ndlp->upcall_flags & NLP_WAIT_FOR_UNREG) {
                ndlp->nrport = NULL;
                ndlp->upcall_flags &= ~NLP_WAIT_FOR_UNREG;
                spin_unlock_irq(&vport->phba->hbalock);

                /* Remove original register reference. The host transport
                 * won't reference this rport/remoteport any further.
                 */
                lpfc_nlp_put(ndlp);
        } else {
                spin_unlock_irq(&vport->phba->hbalock);
        }

 rport_err:
        return;
}

/**
 * lpfc_nvme_handle_lsreq - Process an unsolicited NVME LS request
 * @phba: pointer to lpfc hba data structure.
 * @axchg: pointer to exchange context for the NVME LS request
 *
 * This routine is used for processing an asychronously received NVME LS
 * request. Any remaining validation is done and the LS is then forwarded
 * to the nvme-fc transport via nvme_fc_rcv_ls_req().
 *
 * The calling sequence should be: nvme_fc_rcv_ls_req() -> (processing)
 * -> lpfc_nvme_xmt_ls_rsp/cmp -> req->done.
 * __lpfc_nvme_xmt_ls_rsp_cmp should free the allocated axchg.
 *
 * Returns 0 if LS was handled and delivered to the transport
 * Returns 1 if LS failed to be handled and should be dropped
 */
int
lpfc_nvme_handle_lsreq(struct lpfc_hba *phba,
                        struct lpfc_async_xchg_ctx *axchg)
{
#if (IS_ENABLED(CONFIG_NVME_FC))
        struct lpfc_vport *vport;
        struct lpfc_nvme_rport *lpfc_rport;
        struct nvme_fc_remote_port *remoteport;
        struct lpfc_nvme_lport *lport;
        uint32_t *payload = axchg->payload;
        int rc;

        vport = axchg->ndlp->vport;
        lpfc_rport = axchg->ndlp->nrport;
        if (!lpfc_rport)
                return -EINVAL;

        remoteport = lpfc_rport->remoteport;
        if (!vport->localport)
                return -EINVAL;

        lport = vport->localport->private;
        if (!lport)
                return -EINVAL;

        rc = nvme_fc_rcv_ls_req(remoteport, &axchg->ls_rsp, axchg->payload,
                                axchg->size);

        lpfc_printf_log(phba, KERN_INFO, LOG_NVME_DISC,
                        "6205 NVME Unsol rcv: sz %d rc %d: %08x %08x %08x "
                        "%08x %08x %08x\n",
                        axchg->size, rc,
                        *payload, *(payload+1), *(payload+2),
                        *(payload+3), *(payload+4), *(payload+5));

        if (!rc)
                return 0;
#endif
        return 1;
}

/**
 * __lpfc_nvme_ls_req_cmp - Generic completion handler for a NVME
 *        LS request.
 * @phba: Pointer to HBA context object
 * @vport: The local port that issued the LS
 * @cmdwqe: Pointer to driver command WQE object.
 * @wcqe: Pointer to driver response CQE object.
 *
 * This function is the generic completion handler for NVME LS requests.
 * The function updates any states and statistics, calls the transport
 * ls_req done() routine, then tears down the command and buffers used
 * for the LS request.
 **/
void
__lpfc_nvme_ls_req_cmp(struct lpfc_hba *phba,  struct lpfc_vport *vport,
                        struct lpfc_iocbq *cmdwqe,
                        struct lpfc_wcqe_complete *wcqe)
{
        struct nvmefc_ls_req *pnvme_lsreq;
        struct lpfc_dmabuf *buf_ptr;
        struct lpfc_nodelist *ndlp;
        uint32_t status;

        pnvme_lsreq = (struct nvmefc_ls_req *)cmdwqe->context2;
        ndlp = (struct lpfc_nodelist *)cmdwqe->context1;
        status = bf_get(lpfc_wcqe_c_status, wcqe) & LPFC_IOCB_STATUS_MASK;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6047 NVMEx LS REQ %px cmpl DID %x Xri: %x "
                         "status %x reason x%x cmd:x%px lsreg:x%px bmp:x%px "
                         "ndlp:x%px\n",
                         pnvme_lsreq, ndlp ? ndlp->nlp_DID : 0,
                         cmdwqe->sli4_xritag, status,
                         (wcqe->parameter & 0xffff),
                         cmdwqe, pnvme_lsreq, cmdwqe->context3, ndlp);

        lpfc_nvmeio_data(phba, "NVMEx 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_TRACE_EVENT,
                                 "6046 NVMEx cmpl without done call back? "
                                 "Data %px 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 void
lpfc_nvme_ls_req_cmp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdwqe,
                       struct lpfc_wcqe_complete *wcqe)
{
        struct lpfc_vport *vport = cmdwqe->vport;
        struct lpfc_nvme_lport *lport;
        uint32_t status;

        status = bf_get(lpfc_wcqe_c_status, wcqe) & LPFC_IOCB_STATUS_MASK;

        if (vport->localport) {
                lport = (struct lpfc_nvme_lport *)vport->localport->private;
                if (lport) {
                        atomic_inc(&lport->fc4NvmeLsCmpls);
                        if (status) {
                                if (bf_get(lpfc_wcqe_c_xb, wcqe))
                                        atomic_inc(&lport->cmpl_ls_xb);
                                atomic_inc(&lport->cmpl_ls_err);
                        }
                }
        }

        __lpfc_nvme_ls_req_cmp(phba, vport, cmdwqe, wcqe);
}

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_wqe128 *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;
        /* Initialize only 64 bytes */
        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_ELS4_REQ);
        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> */
        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, &phba->sli4_hba.hdwq[0], genwqe);
        if (rc) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6045 Issue GEN REQ WQE to NPORT x%x "
                                 "Data: x%x x%x  rc x%x\n",
                                 ndlp->nlp_DID, genwqe->iotag,
                                 vport->port_state, rc);
                lpfc_sli_release_iocbq(phba, genwqe);
                return 1;
        }

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC | LOG_ELS,
                         "6050 Issue GEN REQ WQE to NPORT x%x "
                         "Data: oxid: x%x state: x%x wq:x%px lsreq:x%px "
                         "bmp:x%px xmit:%d 1st:%d\n",
                         ndlp->nlp_DID, genwqe->sli4_xritag,
                         vport->port_state,
                         genwqe, pnvme_lsreq, bmp, xmit_len, first_len);
        return 0;
}


/**
 * __lpfc_nvme_ls_req - Generic service routine to issue an NVME LS request
 * @vport: The local port issuing the LS
 * @ndlp: The remote port to send the LS to
 * @pnvme_lsreq: Pointer to LS request structure from the transport
 * @gen_req_cmp: Completion call-back
 *
 * Routine validates the ndlp, builds buffers and sends a GEN_REQUEST
 * WQE to perform the LS operation.
 *
 * Return value :
 *   0 - Success
 *   non-zero: various error codes, in form of -Exxx
 **/
int
__lpfc_nvme_ls_req(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                      struct nvmefc_ls_req *pnvme_lsreq,
                      void (*gen_req_cmp)(struct lpfc_hba *phba,
                                struct lpfc_iocbq *cmdwqe,
                                struct lpfc_wcqe_complete *wcqe))
{
        struct lpfc_dmabuf *bmp;
        struct ulp_bde64 *bpl;
        int ret;
        uint16_t ntype, nstate;

        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6051 NVMEx LS REQ: Bad NDLP x%px, Failing "
                                 "LS Req\n",
                                 ndlp);
                return -ENODEV;
        }

        ntype = ndlp->nlp_type;
        nstate = ndlp->nlp_state;
        if ((ntype & NLP_NVME_TARGET && nstate != NLP_STE_MAPPED_NODE) ||
            (ntype & NLP_NVME_INITIATOR && nstate != NLP_STE_UNMAPPED_NODE)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6088 NVMEx LS REQ: Fail DID x%06x not "
                                 "ready for IO. Type x%x, State x%x\n",
                                 ndlp->nlp_DID, ntype, nstate);
                return -ENODEV;
        }

        /*
         * 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.
         */

        bmp = kmalloc(sizeof(*bmp), GFP_KERNEL);
        if (!bmp) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6044 NVMEx LS REQ: Could not alloc LS buf "
                                 "for DID %x\n",
                                 ndlp->nlp_DID);
                return -ENOMEM;
        }

        bmp->virt = lpfc_mbuf_alloc(vport->phba, MEM_PRI, &(bmp->phys));
        if (!bmp->virt) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6042 NVMEx LS REQ: Could not alloc mbuf "
                                 "for DID %x\n",
                                 ndlp->nlp_DID);
                kfree(bmp);
                return -ENOMEM;
        }

        INIT_LIST_HEAD(&bmp->list);

        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);

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                        "6149 NVMEx LS REQ: Issue to DID 0x%06x lsreq x%px, "
                        "rqstlen:%d rsplen:%d %pad %pad\n",
                        ndlp->nlp_DID, pnvme_lsreq, pnvme_lsreq->rqstlen,
                        pnvme_lsreq->rsplen, &pnvme_lsreq->rqstdma,
                        &pnvme_lsreq->rspdma);

        ret = lpfc_nvme_gen_req(vport, bmp, pnvme_lsreq->rqstaddr,
                                pnvme_lsreq, gen_req_cmp, ndlp, 2,
                                LPFC_NVME_LS_TIMEOUT, 0);
        if (ret != WQE_SUCCESS) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6052 NVMEx REQ: EXIT. issue ls wqe failed "
                                 "lsreq x%px Status %x DID %x\n",
                                 pnvme_lsreq, ret, ndlp->nlp_DID);
                lpfc_mbuf_free(vport->phba, bmp->virt, bmp->phys);
                kfree(bmp);
                return -EIO;
        }

        return 0;
}

/**
 * lpfc_nvme_ls_req - Issue an NVME Link Service request
 * @pnvme_lport: Transport localport that LS is to be issued from.
 * @nvme_rport: Transport remoteport that LS is to be sent to.
 * @pnvme_lsreq: the transport nvme_ls_req structure for the LS
 *
 * 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
 *   non-zero: various error codes, in form of -Exxx
 **/
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)
{
        struct lpfc_nvme_lport *lport;
        struct lpfc_nvme_rport *rport;
        struct lpfc_vport *vport;
        int ret;

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        rport = (struct lpfc_nvme_rport *)pnvme_rport->private;
        if (unlikely(!lport) || unlikely(!rport))
                return -EINVAL;

        vport = lport->vport;
        if (vport->load_flag & FC_UNLOADING)
                return -ENODEV;

        atomic_inc(&lport->fc4NvmeLsRequests);

        ret = __lpfc_nvme_ls_req(vport, rport->ndlp, pnvme_lsreq,
                                 lpfc_nvme_ls_req_cmp);
        if (ret)
                atomic_inc(&lport->xmt_ls_err);

        return ret;
}

/**
 * __lpfc_nvme_ls_abort - Generic service routine to abort a prior
 *         NVME LS request
 * @vport: The local port that issued the LS
 * @ndlp: The remote port the LS was sent to
 * @pnvme_lsreq: Pointer to LS request structure from the transport
 *
 * The driver validates the ndlp, looks for the LS, and aborts the
 * LS if found.
 *
 * Returns:
 * 0 : if LS found and aborted
 * non-zero: various error conditions in form -Exxx
 **/
int
__lpfc_nvme_ls_abort(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                        struct nvmefc_ls_req *pnvme_lsreq)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_sli_ring *pring;
        struct lpfc_iocbq *wqe, *next_wqe;
        bool foundit = false;

        if (!ndlp) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                "6049 NVMEx LS REQ Abort: Bad NDLP x%px DID "
                                "x%06x, Failing LS Req\n",
                                ndlp, ndlp ? ndlp->nlp_DID : 0);
                return -EINVAL;
        }

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC | LOG_NVME_ABTS,
                         "6040 NVMEx LS REQ Abort: Issue LS_ABORT for lsreq "
                         "x%p rqstlen:%d rsplen:%d %pad %pad\n",
                         pnvme_lsreq, pnvme_lsreq->rqstlen,
                         pnvme_lsreq->rsplen, &pnvme_lsreq->rqstdma,
                         &pnvme_lsreq->rspdma);

        /*
         * Lock the ELS ring txcmplq and look for the wqe that matches
         * this ELS. If found, issue an abort on the wqe.
         */
        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) {
                if (wqe->context2 == pnvme_lsreq) {
                        wqe->iocb_flag |= LPFC_DRIVER_ABORTED;
                        foundit = true;
                        break;
                }
        }
        spin_unlock(&pring->ring_lock);

        if (foundit)
                lpfc_sli_issue_abort_iotag(phba, pring, wqe);
        spin_unlock_irq(&phba->hbalock);

        if (foundit)
                return 0;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC | LOG_NVME_ABTS,
                         "6213 NVMEx LS REQ Abort: Unable to locate req x%p\n",
                         pnvme_lsreq);
        return -EINVAL;
}

static int
lpfc_nvme_xmt_ls_rsp(struct nvme_fc_local_port *localport,
                     struct nvme_fc_remote_port *remoteport,
                     struct nvmefc_ls_rsp *ls_rsp)
{
        struct lpfc_async_xchg_ctx *axchg =
                container_of(ls_rsp, struct lpfc_async_xchg_ctx, ls_rsp);
        struct lpfc_nvme_lport *lport;
        int rc;

        if (axchg->phba->pport->load_flag & FC_UNLOADING)
                return -ENODEV;

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

        rc = __lpfc_nvme_xmt_ls_rsp(axchg, ls_rsp, __lpfc_nvme_xmt_ls_rsp_cmp);

        if (rc) {
                /*
                 * unless the failure is due to having already sent
                 * the response, an abort will be generated for the
                 * exchange if the rsp can't be sent.
                 */
                if (rc != -EALREADY)
                        atomic_inc(&lport->xmt_ls_abort);
                return rc;
        }

        return 0;
}

/**
 * lpfc_nvme_ls_abort - Abort a prior NVME LS request
 * @pnvme_lport: Transport localport that LS is to be issued from.
 * @pnvme_rport: Transport remoteport that LS is to be sent to.
 * @pnvme_lsreq: the transport nvme_ls_req structure for the LS
 *
 * Driver registers this routine to abort a NVME LS request that is
 * in progress (from the transports perspective).
 **/
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;
        int ret;

        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        if (unlikely(!lport))
                return;
        vport = lport->vport;
        phba = vport->phba;

        if (vport->load_flag & FC_UNLOADING)
                return;

        ndlp = lpfc_findnode_did(vport, pnvme_rport->port_id);

        ret = __lpfc_nvme_ls_abort(vport, ndlp, pnvme_lsreq);
        if (!ret)
                atomic_inc(&lport->xmt_ls_abort);
}

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

        /*
         * 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.
         */

        wqe = &lpfc_ncmd->cur_iocbq.wqe;

        /*
         * 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->dma_sgl;
        sgl->sge_len = cpu_to_le32(nCmd->cmdlen);
        if (phba->cfg_nvme_embed_cmd) {
                sgl->addr_hi = 0;
                sgl->addr_lo = 0;

                /* Word 0-2 - NVME CMND IU (embedded payload) */
                wqe->generic.bde.tus.f.bdeFlags = BUFF_TYPE_BDE_IMMED;
                wqe->generic.bde.tus.f.bdeSize = 56;
                wqe->generic.bde.addrHigh = 0;
                wqe->generic.bde.addrLow =  64;  /* Word 16 */

                /* Word 10  - dbde is 0, wqes is 1 in template */

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

                *wptr++ = *dptr++;      /* Word 1 */
                *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 */
        } else {
                sgl->addr_hi = cpu_to_le32(putPaddrHigh(nCmd->cmddma));
                sgl->addr_lo = cpu_to_le32(putPaddrLow(nCmd->cmddma));

                /* Word 0-2 - NVME CMND IU Inline BDE */
                wqe->generic.bde.tus.f.bdeFlags =  BUFF_TYPE_BDE_64;
                wqe->generic.bde.tus.f.bdeSize = nCmd->cmdlen;
                wqe->generic.bde.addrHigh = sgl->addr_hi;
                wqe->generic.bde.addrLow =  sgl->addr_lo;

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

        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);
}


/*
 * lpfc_nvme_io_cmd_wqe_cmpl - Complete an NVME-over-FCP IO
 *
 * 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_io_buf *lpfc_ncmd =
                (struct lpfc_io_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_nodelist *ndlp;
        struct lpfc_nvme_fcpreq_priv *freqpriv;
        struct lpfc_nvme_lport *lport;
        uint32_t code, status, idx;
        uint16_t cid, sqhd, data;
        uint32_t *ptr;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        int cpu;
#endif

        /* Sanity check on return of outstanding command */
        if (!lpfc_ncmd) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6071 Null lpfc_ncmd pointer. No "
                                 "release, skip completion\n");
                return;
        }

        /* Guard against abort handler being called at same time */
        spin_lock(&lpfc_ncmd->buf_lock);

        if (!lpfc_ncmd->nvmeCmd) {
                spin_unlock(&lpfc_ncmd->buf_lock);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6066 Missing cmpl ptrs: lpfc_ncmd x%px, "
                                 "nvmeCmd x%px\n",
                                 lpfc_ncmd, lpfc_ncmd->nvmeCmd);

                /* Release the lpfc_ncmd regardless of the missing elements. */
                lpfc_release_nvme_buf(phba, lpfc_ncmd);
                return;
        }
        nCmd = lpfc_ncmd->nvmeCmd;
        status = bf_get(lpfc_wcqe_c_status, wcqe);

        idx = lpfc_ncmd->cur_iocbq.hba_wqidx;
        phba->sli4_hba.hdwq[idx].nvme_cstat.io_cmpls++;

        if (unlikely(status && vport->localport)) {
                lport = (struct lpfc_nvme_lport *)vport->localport->private;
                if (lport) {
                        if (bf_get(lpfc_wcqe_c_xb, wcqe))
                                atomic_inc(&lport->cmpl_fcp_xb);
                        atomic_inc(&lport->cmpl_fcp_err);
                }
        }

        lpfc_nvmeio_data(phba, "NVME FCP CMPL: xri x%x stat x%x parm x%x\n",
                         lpfc_ncmd->cur_iocbq.sli4_xritag,
                         status, wcqe->parameter);
        /*
         * Catch race where our node has transitioned, but the
         * transport is still transitioning.
         */
        ndlp = lpfc_ncmd->ndlp;
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "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 = (status & LPFC_IOCB_STATUS_MASK);
                lpfc_ncmd->result = (wcqe->parameter & IOERR_PARAM_MASK);

                /* 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_TRACE_EVENT,
                                         "6081 NVME Completion Protocol Error: "
                                         "xri %x status x%x result x%x "
                                         "placed x%x\n",
                                         lpfc_ncmd->cur_iocbq.sli4_xritag,
                                         lpfc_ncmd->status, lpfc_ncmd->result,
                                         wcqe->total_data_placed);
                        break;
                case IOSTAT_LOCAL_REJECT:
                        /* Let fall through to set command final state. */
                        if (lpfc_ncmd->result == IOERR_ABORT_REQUESTED)
                                lpfc_printf_vlog(vport, KERN_INFO,
                                         LOG_NVME_IOERR,
                                         "6032 Delay Aborted cmd x%px "
                                         "nvme cmd x%px, xri x%x, "
                                         "xb %d\n",
                                         lpfc_ncmd, nCmd,
                                         lpfc_ncmd->cur_iocbq.sli4_xritag,
                                         bf_get(lpfc_wcqe_c_xb, wcqe));
                        fallthrough;
                default:
out_err:
                        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                         "6072 NVME Completion Error: xri %x "
                                         "status x%x result x%x [x%x] "
                                         "placed x%x\n",
                                         lpfc_ncmd->cur_iocbq.sli4_xritag,
                                         lpfc_ncmd->status, lpfc_ncmd->result,
                                         wcqe->parameter,
                                         wcqe->total_data_placed);
                        nCmd->transferred_length = 0;
                        nCmd->rcv_rsplen = 0;
                        nCmd->status = NVME_SC_INTERNAL;
                }
        }

        /* 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;

        /* 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 (lpfc_ncmd->ts_cmd_start) {
                lpfc_ncmd->ts_isr_cmpl = pwqeIn->isr_timestamp;
                lpfc_ncmd->ts_data_io = ktime_get_ns();
                phba->ktime_last_cmd = lpfc_ncmd->ts_data_io;
                lpfc_io_ktime(phba, lpfc_ncmd);
        }
        if (unlikely(phba->hdwqstat_on & LPFC_CHECK_NVME_IO)) {
                cpu = raw_smp_processor_id();
                this_cpu_inc(phba->sli4_hba.c_stat->cmpl_io);
                if (lpfc_ncmd->cpu != cpu)
                        lpfc_printf_vlog(vport,
                                         KERN_INFO, LOG_NVME_IOERR,
                                         "6701 CPU Check cmpl: "
                                         "cpu %d expect %d\n",
                                         cpu, lpfc_ncmd->cpu);
        }
#endif

        /* NVME targets need completion held off until the abort exchange
         * completes unless the NVME Rport is getting unregistered.
         */

        if (!(lpfc_ncmd->flags & LPFC_SBUF_XBUSY)) {
                freqpriv = nCmd->private;
                freqpriv->nvme_buf = NULL;
                lpfc_ncmd->nvmeCmd = NULL;
                spin_unlock(&lpfc_ncmd->buf_lock);
                nCmd->done(nCmd);
        } else
                spin_unlock(&lpfc_ncmd->buf_lock);

        /* Call release with XB=1 to queue the IO into the abort list. */
        lpfc_release_nvme_buf(phba, lpfc_ncmd);
}


/**
 * lpfc_nvme_prep_io_cmd - Issue an NVME-over-FCP IO
 * @vport: pointer to a host virtual N_Port data structure
 * @lpfcn_cmd: Pointer to lpfc scsi command
 * @pnode: pointer to a node-list data structure
 * @cstat: pointer to the control status structure
 *
 * 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_io_buf *lpfc_ncmd,
                      struct lpfc_nodelist *pnode,
                      struct lpfc_fc4_ctrl_stat *cstat)
{
        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 = &pwqeq->wqe;
        uint32_t req_len;

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

        /*
         * There are three possibilities here - use scatter-gather segment, use
         * the single mapping, or neither.
         */
        if (nCmd->sg_cnt) {
                if (nCmd->io_dir == NVMEFC_FCP_WRITE) {
                        /* From the iwrite template, initialize words 7 - 11 */
                        memcpy(&wqe->words[7],
                               &lpfc_iwrite_cmd_template.words[7],
                               sizeof(uint32_t) * 5);

                        /* Word 4 */
                        wqe->fcp_iwrite.total_xfer_len = nCmd->payload_length;

                        /* 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;
                        } else {
                                wqe->fcp_iwrite.initial_xfer_len = 0;
                        }
                        cstat->output_requests++;
                } else {
                        /* From the iread template, initialize words 7 - 11 */
                        memcpy(&wqe->words[7],
                               &lpfc_iread_cmd_template.words[7],
                               sizeof(uint32_t) * 5);

                        /* Word 4 */
                        wqe->fcp_iread.total_xfer_len = nCmd->payload_length;

                        /* Word 5 */
                        wqe->fcp_iread.rsrvd5 = 0;

                        cstat->input_requests++;
                }
        } else {
                /* From the icmnd template, initialize words 4 - 11 */
                memcpy(&wqe->words[4], &lpfc_icmnd_cmd_template.words[4],
                       sizeof(uint32_t) * 8);
                cstat->control_requests++;
        }

        if (pnode->nlp_nvme_info & NLP_NVME_NSLER)
                bf_set(wqe_erp, &wqe->generic.wqe_com, 1);
        /*
         * Finish initializing those WQE fields that are independent
         * of the nvme_cmnd request_buffer
         */

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

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

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

        /* Words 13 14 15 are for PBDE support */

        pwqeq->vport = vport;
        return 0;
}


/**
 * lpfc_nvme_prep_io_dma - Issue an NVME-over-FCP IO
 * @vport: pointer to a host virtual N_Port data structure
 * @lpfcn_cmd: Pointer to lpfc scsi command
 *
 * 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_io_buf *lpfc_ncmd)
{
        struct lpfc_hba *phba = vport->phba;
        struct nvmefc_fcp_req *nCmd = lpfc_ncmd->nvmeCmd;
        union lpfc_wqe128 *wqe = &lpfc_ncmd->cur_iocbq.wqe;
        struct sli4_sge *sgl = lpfc_ncmd->dma_sgl;
        struct sli4_hybrid_sgl *sgl_xtra = NULL;
        struct scatterlist *data_sg;
        struct sli4_sge *first_data_sgl;
        struct ulp_bde64 *bde;
        dma_addr_t physaddr = 0;
        uint32_t num_bde = 0;
        uint32_t dma_len = 0;
        uint32_t dma_offset = 0;
        int nseg, i, j;
        bool lsp_just_set = false;

        /* 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 > lpfc_nvme_template.max_sgl_segments) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
                                        "6058 Too many sg segments from "
                                        "NVME Transport.  Max %d, "
                                        "nvmeIO sg_cnt %d\n",
                                        phba->cfg_nvme_seg_cnt + 1,
                                        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 tracking the segment boundaries */
                j = 2;
                for (i = 0; i < nseg; i++) {
                        if (data_sg == NULL) {
                                lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
                                                "6059 dptr err %d, nseg %d\n",
                                                i, nseg);
                                lpfc_ncmd->seg_cnt = 0;
                                return 1;
                        }

                        sgl->word2 = 0;
                        if ((num_bde + 1) == nseg) {
                                bf_set(lpfc_sli4_sge_last, sgl, 1);
                                bf_set(lpfc_sli4_sge_type, sgl,
                                       LPFC_SGE_TYPE_DATA);
                        } else {
                                bf_set(lpfc_sli4_sge_last, sgl, 0);

                                /* expand the segment */
                                if (!lsp_just_set &&
                                    !((j + 1) % phba->border_sge_num) &&
                                    ((nseg - 1) != i)) {
                                        /* set LSP type */
                                        bf_set(lpfc_sli4_sge_type, sgl,
                                               LPFC_SGE_TYPE_LSP);

                                        sgl_xtra = lpfc_get_sgl_per_hdwq(
                                                        phba, lpfc_ncmd);

                                        if (unlikely(!sgl_xtra)) {
                                                lpfc_ncmd->seg_cnt = 0;
                                                return 1;
                                        }
                                        sgl->addr_lo = cpu_to_le32(putPaddrLow(
                                                       sgl_xtra->dma_phys_sgl));
                                        sgl->addr_hi = cpu_to_le32(putPaddrHigh(
                                                       sgl_xtra->dma_phys_sgl));

                                } else {
                                        bf_set(lpfc_sli4_sge_type, sgl,
                                               LPFC_SGE_TYPE_DATA);
                                }
                        }

                        if (!(bf_get(lpfc_sli4_sge_type, sgl) &
                                     LPFC_SGE_TYPE_LSP)) {
                                if ((nseg - 1) == i)
                                        bf_set(lpfc_sli4_sge_last, sgl, 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));

                                bf_set(lpfc_sli4_sge_offset, sgl, dma_offset);
                                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++;

                                lsp_just_set = false;
                        } else {
                                sgl->word2 = cpu_to_le32(sgl->word2);

                                sgl->sge_len = cpu_to_le32(
                                                     phba->cfg_sg_dma_buf_size);

                                sgl = (struct sli4_sge *)sgl_xtra->dma_sgl;
                                i = i - 1;

                                lsp_just_set = true;
                        }

                        j++;
                }
                if (phba->cfg_enable_pbde) {
                        /* Use PBDE support for first SGL only, offset == 0 */
                        /* Words 13-15 */
                        bde = (struct ulp_bde64 *)
                                &wqe->words[13];
                        bde->addrLow = first_data_sgl->addr_lo;
                        bde->addrHigh = first_data_sgl->addr_hi;
                        bde->tus.f.bdeSize =
                                le32_to_cpu(first_data_sgl->sge_len);
                        bde->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
                        bde->tus.w = cpu_to_le32(bde->tus.w);
                        /* wqe_pbde is 1 in template */
                } else {
                        memset(&wqe->words[13], 0, (sizeof(uint32_t) * 3));
                        bf_set(wqe_pbde, &wqe->generic.wqe_com, 0);
                }

        } else {
                lpfc_ncmd->seg_cnt = 0;

                /* 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_TRACE_EVENT,
                                        "6063 NVME DMA Prep Err: sg_cnt %d "
                                        "payload_length x%x\n",
                                        nCmd->sg_cnt, nCmd->payload_length);
                        return 1;
                }
        }
        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;
        int expedite = 0;
        int idx, cpu;
        struct lpfc_nvme_lport *lport;
        struct lpfc_fc4_ctrl_stat *cstat;
        struct lpfc_vport *vport;
        struct lpfc_hba *phba;
        struct lpfc_nodelist *ndlp;
        struct lpfc_io_buf *lpfc_ncmd;
        struct lpfc_nvme_rport *rport;
        struct lpfc_nvme_qhandle *lpfc_queue_info;
        struct lpfc_nvme_fcpreq_priv *freqpriv;
        struct nvme_common_command *sqe;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        uint64_t start = 0;
#endif

        /* Validate pointers. LLDD fault handling with transport does
         * have timing races.
         */
        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        if (unlikely(!lport)) {
                ret = -EINVAL;
                goto out_fail;
        }

        vport = lport->vport;

        if (unlikely(!hw_queue_handle)) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                 "6117 Fail IO, NULL hw_queue_handle\n");
                atomic_inc(&lport->xmt_fcp_err);
                ret = -EBUSY;
                goto out_fail;
        }

        phba = vport->phba;

        if (unlikely(vport->load_flag & FC_UNLOADING)) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                 "6124 Fail IO, Driver unload\n");
                atomic_inc(&lport->xmt_fcp_err);
                ret = -ENODEV;
                goto out_fail;
        }

        freqpriv = pnvme_fcreq->private;
        if (unlikely(!freqpriv)) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                 "6158 Fail IO, NULL request data\n");
                atomic_inc(&lport->xmt_fcp_err);
                ret = -EINVAL;
                goto out_fail;
        }

#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_INFO, LOG_NODE | LOG_NVME_IOERR,
                                 "6053 Busy IO, ndlp not ready: rport x%px "
                                  "ndlp x%px, DID x%06x\n",
                                 rport, ndlp, pnvme_rport->port_id);
                atomic_inc(&lport->xmt_fcp_err);
                ret = -EBUSY;
                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_INFO, LOG_NODE | LOG_NVME_IOERR,
                                 "6036 Fail IO, DID x%06x not ready for "
                                 "IO. State x%x, Type x%x Flg x%x\n",
                                 pnvme_rport->port_id,
                                 ndlp->nlp_state, ndlp->nlp_type,
                                 ndlp->upcall_flags);
                atomic_inc(&lport->xmt_fcp_bad_ndlp);
                ret = -EBUSY;
                goto out_fail;

        }

        /* Currently only NVME Keep alive commands should be expedited
         * if the driver runs out of a resource. These should only be
         * issued on the admin queue, qidx 0
         */
        if (!lpfc_queue_info->qidx && !pnvme_fcreq->sg_cnt) {
                sqe = &((struct nvme_fc_cmd_iu *)
                        pnvme_fcreq->cmdaddr)->sqe.common;
                if (sqe->opcode == nvme_admin_keep_alive)
                        expedite = 1;
        }

        /* The node is shared with FCP IO, make sure the IO pending count does
         * not exceed the programmed depth.
         */
        if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
                if ((atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth) &&
                    !expedite) {
                        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                         "6174 Fail IO, ndlp qdepth exceeded: "
                                         "idx %d DID %x pend %d qdepth %d\n",
                                         lpfc_queue_info->index, ndlp->nlp_DID,
                                         atomic_read(&ndlp->cmd_pending),
                                         ndlp->cmd_qdepth);
                        atomic_inc(&lport->xmt_fcp_qdepth);
                        ret = -EBUSY;
                        goto out_fail;
                }
        }

        /* Lookup Hardware Queue index based on fcp_io_sched module parameter */
        if (phba->cfg_fcp_io_sched == LPFC_FCP_SCHED_BY_HDWQ) {
                idx = lpfc_queue_info->index;
        } else {
                cpu = raw_smp_processor_id();
                idx = phba->sli4_hba.cpu_map[cpu].hdwq;
        }

        lpfc_ncmd = lpfc_get_nvme_buf(phba, ndlp, idx, expedite);
        if (lpfc_ncmd == NULL) {
                atomic_inc(&lport->xmt_fcp_noxri);
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                 "6065 Fail IO, driver buffer pool is empty: "
                                 "idx %d DID %x\n",
                                 lpfc_queue_info->index, ndlp->nlp_DID);
                ret = -EBUSY;
                goto out_fail;
        }
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        if (start) {
                lpfc_ncmd->ts_cmd_start = start;
                lpfc_ncmd->ts_last_cmd = phba->ktime_last_cmd;
        } else {
                lpfc_ncmd->ts_cmd_start = 0;
        }
#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.
         */
        freqpriv->nvme_buf = lpfc_ncmd;
        lpfc_ncmd->nvmeCmd = pnvme_fcreq;
        lpfc_ncmd->ndlp = ndlp;
        lpfc_ncmd->qidx = lpfc_queue_info->qidx;

        /*
         * 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 = idx;
        cstat = &phba->sli4_hba.hdwq[idx].nvme_cstat;

        lpfc_nvme_prep_io_cmd(vport, lpfc_ncmd, ndlp, cstat);
        ret = lpfc_nvme_prep_io_dma(vport, lpfc_ncmd);
        if (ret) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                 "6175 Fail IO, Prep DMA: "
                                 "idx %d DID %x\n",
                                 lpfc_queue_info->index, ndlp->nlp_DID);
                atomic_inc(&lport->xmt_fcp_err);
                ret = -ENOMEM;
                goto out_free_nvme_buf;
        }

        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_ncmd->hdwq, &lpfc_ncmd->cur_iocbq);
        if (ret) {
                atomic_inc(&lport->xmt_fcp_wqerr);
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                                 "6113 Fail IO, 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);
                goto out_free_nvme_buf;
        }

        if (phba->cfg_xri_rebalancing)
                lpfc_keep_pvt_pool_above_lowwm(phba, lpfc_ncmd->hdwq_no);

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

        if (phba->hdwqstat_on & LPFC_CHECK_NVME_IO) {
                cpu = raw_smp_processor_id();
                this_cpu_inc(phba->sli4_hba.c_stat->xmt_io);
                lpfc_ncmd->cpu = cpu;
                if (idx != cpu)
                        lpfc_printf_vlog(vport,
                                         KERN_INFO, LOG_NVME_IOERR,
                                        "6702 CPU Check cmd: "
                                        "cpu %d wq %d\n",
                                        lpfc_ncmd->cpu,
                                        lpfc_queue_info->index);
        }
#endif
        return 0;

 out_free_nvme_buf:
        if (lpfc_ncmd->nvmeCmd->sg_cnt) {
                if (lpfc_ncmd->nvmeCmd->io_dir == NVMEFC_FCP_WRITE)
                        cstat->output_requests--;
                else
                        cstat->input_requests--;
        } else
                cstat->control_requests--;
        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_INFO, 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_io_buf *lpfc_nbuf;
        struct lpfc_iocbq *abts_buf;
        struct lpfc_iocbq *nvmereq_wqe;
        struct lpfc_nvme_fcpreq_priv *freqpriv;
        unsigned long flags;
        int ret_val;

        /* Validate pointers. LLDD fault handling with transport does
         * have timing races.
         */
        lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
        if (unlikely(!lport))
                return;

        vport = lport->vport;

        if (unlikely(!hw_queue_handle)) {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_ABTS,
                                 "6129 Fail Abort, HW Queue Handle NULL.\n");
                return;
        }

        phba = vport->phba;
        freqpriv = pnvme_fcreq->private;

        if (unlikely(!freqpriv))
                return;
        if (vport->load_flag & FC_UNLOADING)
                return;

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

        /* 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_IOQ_FLUSH) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6139 Driver in reset cleanup - flushing "
                                 "NVME Req now.  hba_flag x%x\n",
                                 phba->hba_flag);
                return;
        }

        lpfc_nbuf = freqpriv->nvme_buf;
        if (!lpfc_nbuf) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "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_TRACE_EVENT,
                                 "6141 lpfc NVME IO req has no nvme_fcreq "
                                 "io buffer.  Skipping abort req.\n");
                return;
        }
        nvmereq_wqe = &lpfc_nbuf->cur_iocbq;

        /* Guard against IO completion being called at same time */
        spin_lock(&lpfc_nbuf->buf_lock);

        /*
         * 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) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6143 NVME req mismatch: "
                                 "lpfc_nbuf x%px nvmeCmd x%px, "
                                 "pnvme_fcreq x%px.  Skipping Abort xri x%x\n",
                                 lpfc_nbuf, lpfc_nbuf->nvmeCmd,
                                 pnvme_fcreq, nvmereq_wqe->sli4_xritag);
                goto out_unlock;
        }

        /* Don't abort IOs no longer on the pending queue. */
        if (!(nvmereq_wqe->iocb_flag & LPFC_IO_ON_TXCMPLQ)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6142 NVME IO req x%px not queued - skipping "
                                 "abort req xri x%x\n",
                                 pnvme_fcreq, nvmereq_wqe->sli4_xritag);
                goto out_unlock;
        }

        atomic_inc(&lport->xmt_fcp_abort);
        lpfc_nvmeio_data(phba, "NVME FCP ABORT: xri x%x idx %d to %06x\n",
                         nvmereq_wqe->sli4_xritag,
                         nvmereq_wqe->hba_wqidx, pnvme_rport->port_id);

        /* Outstanding abort is in progress */
        if (nvmereq_wqe->iocb_flag & LPFC_DRIVER_ABORTED) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6144 Outstanding NVME I/O Abort Request "
                                 "still pending on nvme_fcreq x%px, "
                                 "lpfc_ncmd %px xri x%x\n",
                                 pnvme_fcreq, lpfc_nbuf,
                                 nvmereq_wqe->sli4_xritag);

                goto out_unlock;
        }

        abts_buf = __lpfc_sli_get_iocbq(phba);
        if (!abts_buf) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6136 No available abort wqes. Skipping "
                                 "Abts req for nvme_fcreq x%px xri x%x\n",
                                 pnvme_fcreq, nvmereq_wqe->sli4_xritag);
                goto out_unlock;
        }

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

        lpfc_nvme_prep_abort_wqe(abts_buf, nvmereq_wqe->sli4_xritag, 0);

        /* 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_nbuf->hdwq, abts_buf);
        spin_unlock(&lpfc_nbuf->buf_lock);
        spin_unlock_irqrestore(&phba->hbalock, flags);
        if (ret_val) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6137 Failed abts issue_wqe with status x%x "
                                 "for nvme_fcreq x%px.\n",
                                 ret_val, pnvme_fcreq);
                lpfc_sli_release_iocbq(phba, abts_buf);
                return;
        }

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

out_unlock:
        spin_unlock(&lpfc_nbuf->buf_lock);
        spin_unlock_irqrestore(&phba->hbalock, flags);
        return;
}

/* 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,
        .xmt_ls_rsp   = lpfc_nvme_xmt_ls_rsp,

        .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 = sizeof(struct lpfc_nvme_fcpreq_priv),
};

/**
 * lpfc_get_nvme_buf - Get a nvme buffer from io_buf_list of the HBA
 * @phba: The HBA for which this call is being executed.
 *
 * This routine removes a nvme buffer from head of @hdwq io_buf_list
 * and returns to caller.
 *
 * Return codes:
 *   NULL - Error
 *   Pointer to lpfc_nvme_buf - Success
 **/
static struct lpfc_io_buf *
lpfc_get_nvme_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
                  int idx, int expedite)
{
        struct lpfc_io_buf *lpfc_ncmd;
        struct lpfc_sli4_hdw_queue *qp;
        struct sli4_sge *sgl;
        struct lpfc_iocbq *pwqeq;
        union lpfc_wqe128 *wqe;

        lpfc_ncmd = lpfc_get_io_buf(phba, NULL, idx, expedite);

        if (lpfc_ncmd) {
                pwqeq = &(lpfc_ncmd->cur_iocbq);
                wqe = &pwqeq->wqe;

                /* Setup key fields in buffer that may have been changed
                 * if other protocols used this buffer.
                 */
                pwqeq->iocb_flag = LPFC_IO_NVME;
                pwqeq->wqe_cmpl = lpfc_nvme_io_cmd_wqe_cmpl;
                lpfc_ncmd->start_time = jiffies;
                lpfc_ncmd->flags = 0;

                /* 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.
                 */
                sgl = lpfc_ncmd->dma_sgl;
                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 */

                /* Initialize 64 bytes only */
                memset(wqe, 0, sizeof(union lpfc_wqe));

                if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
                        atomic_inc(&ndlp->cmd_pending);
                        lpfc_ncmd->flags |= LPFC_SBUF_BUMP_QDEPTH;
                }

        } else {
                qp = &phba->sli4_hba.hdwq[idx];
                qp->empty_io_bufs++;
        }

        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_io_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_io_buf *lpfc_ncmd)
{
        struct lpfc_sli4_hdw_queue *qp;
        unsigned long iflag = 0;

        if ((lpfc_ncmd->flags & LPFC_SBUF_BUMP_QDEPTH) && lpfc_ncmd->ndlp)
                atomic_dec(&lpfc_ncmd->ndlp->cmd_pending);

        lpfc_ncmd->ndlp = NULL;
        lpfc_ncmd->flags &= ~LPFC_SBUF_BUMP_QDEPTH;

        qp = lpfc_ncmd->hdwq;
        if (unlikely(lpfc_ncmd->flags & LPFC_SBUF_XBUSY)) {
                lpfc_printf_log(phba, KERN_INFO, LOG_NVME_ABTS,
                                "6310 XB release deferred for "
                                "ox_id x%x on reqtag x%x\n",
                                lpfc_ncmd->cur_iocbq.sli4_xritag,
                                lpfc_ncmd->cur_iocbq.iotag);

                spin_lock_irqsave(&qp->abts_io_buf_list_lock, iflag);
                list_add_tail(&lpfc_ncmd->list,
                        &qp->lpfc_abts_io_buf_list);
                qp->abts_nvme_io_bufs++;
                spin_unlock_irqrestore(&qp->abts_io_buf_list_lock, iflag);
        } else
                lpfc_release_io_buf(phba, (struct lpfc_io_buf *)lpfc_ncmd, qp);
}

/**
 * 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)
{
        int ret = 0;
        struct lpfc_hba  *phba = vport->phba;
        struct nvme_fc_port_info nfcp_info;
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;

        /* 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);

        /* We need to tell the transport layer + 1 because it takes page
         * alignment into account. When space for the SGL is allocated we
         * allocate + 3, one for cmd, one for rsp and one for this alignment
         */
        lpfc_nvme_template.max_sgl_segments = phba->cfg_nvme_seg_cnt + 1;

        /* Advertise how many hw queues we support based on cfg_hdw_queue,
         * which will not exceed cpu count.
         */
        lpfc_nvme_template.max_hw_queues = phba->cfg_hdw_queue;

        if (!IS_ENABLED(CONFIG_NVME_FC))
                return ret;

        /* 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 x%px, private "
                                 "x%px, 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;
                vport->nvmei_support = 1;

                atomic_set(&lport->xmt_fcp_noxri, 0);
                atomic_set(&lport->xmt_fcp_bad_ndlp, 0);
                atomic_set(&lport->xmt_fcp_qdepth, 0);
                atomic_set(&lport->xmt_fcp_err, 0);
                atomic_set(&lport->xmt_fcp_wqerr, 0);
                atomic_set(&lport->xmt_fcp_abort, 0);
                atomic_set(&lport->xmt_ls_abort, 0);
                atomic_set(&lport->xmt_ls_err, 0);
                atomic_set(&lport->cmpl_fcp_xb, 0);
                atomic_set(&lport->cmpl_fcp_err, 0);
                atomic_set(&lport->cmpl_ls_xb, 0);
                atomic_set(&lport->cmpl_ls_err, 0);

                atomic_set(&lport->fc4NvmeLsRequests, 0);
                atomic_set(&lport->fc4NvmeLsCmpls, 0);
        }

        return ret;
}

#if (IS_ENABLED(CONFIG_NVME_FC))
/* lpfc_nvme_lport_unreg_wait - Wait for the host to complete an lport unreg.
 *
 * The driver has to wait for the host nvme transport to callback
 * indicating the localport has successfully unregistered all
 * resources.  Since this is an uninterruptible wait, loop every ten
 * seconds and print a message indicating no progress.
 *
 * An uninterruptible wait is used because of the risk of transport-to-
 * driver state mismatch.
 */
static void
lpfc_nvme_lport_unreg_wait(struct lpfc_vport *vport,
                           struct lpfc_nvme_lport *lport,
                           struct completion *lport_unreg_cmp)
{
        u32 wait_tmo;
        int ret, i, pending = 0;
        struct lpfc_sli_ring  *pring;
        struct lpfc_hba  *phba = vport->phba;

        /* Host transport has to clean up and confirm requiring an indefinite
         * wait. Print a message if a 10 second wait expires and renew the
         * wait. This is unexpected.
         */
        wait_tmo = msecs_to_jiffies(LPFC_NVME_WAIT_TMO * 1000);
        while (true) {
                ret = wait_for_completion_timeout(lport_unreg_cmp, wait_tmo);
                if (unlikely(!ret)) {
                        pending = 0;
                        for (i = 0; i < phba->cfg_hdw_queue; i++) {
                                pring = phba->sli4_hba.hdwq[i].io_wq->pring;
                                if (!pring)
                                        continue;
                                if (pring->txcmplq_cnt)
                                        pending += pring->txcmplq_cnt;
                        }
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                         "6176 Lport x%px Localport x%px wait "
                                         "timed out. Pending %d. Renewing.\n",
                                         lport, vport->localport, pending);
                        continue;
                }
                break;
        }
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
                         "6177 Lport x%px Localport x%px Complete Success\n",
                         lport, vport->localport);
}
#endif

/**
 * 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)
{
#if (IS_ENABLED(CONFIG_NVME_FC))
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;
        int ret;
        DECLARE_COMPLETION_ONSTACK(lport_unreg_cmp);

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

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

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

        /* lport's rport list is clear.  Unregister
         * lport and release resources.
         */
        lport->lport_unreg_cmp = &lport_unreg_cmp;
        ret = nvme_fc_unregister_localport(localport);

        /* Wait for completion.  This either blocks
         * indefinitely or succeeds
         */
        lpfc_nvme_lport_unreg_wait(vport, lport, &lport_unreg_cmp);
        vport->localport = NULL;

        /* 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);
        }
#endif
}

void
lpfc_nvme_update_localport(struct lpfc_vport *vport)
{
#if (IS_ENABLED(CONFIG_NVME_FC))
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;

        localport = vport->localport;
        if (!localport) {
                lpfc_printf_vlog(vport, KERN_WARNING, LOG_NVME,
                                 "6710 Update NVME fail. No localport\n");
                return;
        }
        lport = (struct lpfc_nvme_lport *)localport->private;
        if (!lport) {
                lpfc_printf_vlog(vport, KERN_WARNING, LOG_NVME,
                                 "6171 Update NVME fail. localP x%px, No lport\n",
                                 localport);
                return;
        }
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME,
                         "6012 Update NVME lport x%px 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 x%px to DID x%06x\n",
                         lport, localport->port_id);
#endif
}

int
lpfc_nvme_register_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
{
#if (IS_ENABLED(CONFIG_NVME_FC))
        int ret = 0;
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;
        struct lpfc_nvme_rport *rport;
        struct lpfc_nvme_rport *oldrport;
        struct nvme_fc_remote_port *remote_port;
        struct nvme_fc_port_info rpinfo;
        struct lpfc_nodelist *prev_ndlp = NULL;
        struct fc_rport *srport = ndlp->rport;

        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;
        if (!localport)
                return 0;

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

        /* NVME rports are not preserved across devloss.
         * Just register this instance.  Note, rpinfo->dev_loss_tmo
         * is left 0 to indicate accept transport defaults.  The
         * driver communicates port role capabilities consistent
         * with the PRLI response data.
         */
        memset(&rpinfo, 0, sizeof(struct nvme_fc_port_info));
        rpinfo.port_id = ndlp->nlp_DID;
        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;

        if (ndlp->nlp_type & NLP_NVME_DISCOVERY)
                rpinfo.port_role |= FC_PORT_ROLE_NVME_DISCOVERY;

        rpinfo.port_name = wwn_to_u64(ndlp->nlp_portname.u.wwn);
        rpinfo.node_name = wwn_to_u64(ndlp->nlp_nodename.u.wwn);
        if (srport)
                rpinfo.dev_loss_tmo = srport->dev_loss_tmo;
        else
                rpinfo.dev_loss_tmo = vport->cfg_devloss_tmo;

        spin_lock_irq(&vport->phba->hbalock);
        oldrport = lpfc_ndlp_get_nrport(ndlp);
        if (oldrport) {
                prev_ndlp = oldrport->ndlp;
                spin_unlock_irq(&vport->phba->hbalock);
        } else {
                spin_unlock_irq(&vport->phba->hbalock);
                lpfc_nlp_get(ndlp);
        }

        ret = nvme_fc_register_remoteport(localport, &rpinfo, &remote_port);
        if (!ret) {
                /* If the ndlp already has an nrport, this is just
                 * a resume of the existing rport.  Else this is a
                 * new rport.
                 */
                /* Guard against an unregister/reregister
                 * race that leaves the WAIT flag set.
                 */
                spin_lock_irq(&vport->phba->hbalock);
                ndlp->upcall_flags &= ~NLP_WAIT_FOR_UNREG;
                spin_unlock_irq(&vport->phba->hbalock);
                rport = remote_port->private;
                if (oldrport) {

                        /* Sever the ndlp<->rport association
                         * before dropping the ndlp ref from
                         * register.
                         */
                        spin_lock_irq(&vport->phba->hbalock);
                        ndlp->nrport = NULL;
                        ndlp->upcall_flags &= ~NLP_WAIT_FOR_UNREG;
                        spin_unlock_irq(&vport->phba->hbalock);
                        rport->ndlp = NULL;
                        rport->remoteport = NULL;

                        /* Reference only removed if previous NDLP is no longer
                         * active. It might be just a swap and removing the
                         * reference would cause a premature cleanup.
                         */
                        if (prev_ndlp && prev_ndlp != ndlp) {
                                if ((!NLP_CHK_NODE_ACT(prev_ndlp)) ||
                                    (!prev_ndlp->nrport))
                                        lpfc_nlp_put(prev_ndlp);
                        }
                }

                /* Clean bind the rport to the ndlp. */
                rport->remoteport = remote_port;
                rport->lport = lport;
                rport->ndlp = ndlp;
                spin_lock_irq(&vport->phba->hbalock);
                ndlp->nrport = rport;
                spin_unlock_irq(&vport->phba->hbalock);
                lpfc_printf_vlog(vport, KERN_INFO,
                                 LOG_NVME_DISC | LOG_NODE,
                                 "6022 Bind lport x%px to remoteport x%px "
                                 "rport x%px WWNN 0x%llx, "
                                 "Rport WWPN 0x%llx DID "
                                 "x%06x Role x%x, ndlp %p prev_ndlp x%px\n",
                                 lport, remote_port, rport,
                                 rpinfo.node_name, rpinfo.port_name,
                                 rpinfo.port_id, rpinfo.port_role,
                                 ndlp, prev_ndlp);
        } else {
                lpfc_printf_vlog(vport, KERN_ERR,
                                 LOG_TRACE_EVENT,
                                 "6031 RemotePort Registration failed "
                                 "err: %d, DID x%06x\n",
                                 ret, ndlp->nlp_DID);
        }

        return ret;
#else
        return 0;
#endif
}

/**
 * lpfc_nvme_rescan_port - Check to see if we should rescan this remoteport
 *
 * If the ndlp represents an NVME Target, that we are logged into,
 * ping the NVME FC Transport layer to initiate a device rescan
 * on this remote NPort.
 */
void
lpfc_nvme_rescan_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
{
#if (IS_ENABLED(CONFIG_NVME_FC))
        struct lpfc_nvme_rport *nrport;
        struct nvme_fc_remote_port *remoteport = NULL;

        spin_lock_irq(&vport->phba->hbalock);
        nrport = lpfc_ndlp_get_nrport(ndlp);
        if (nrport)
                remoteport = nrport->remoteport;
        spin_unlock_irq(&vport->phba->hbalock);

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6170 Rescan NPort DID x%06x type x%x "
                         "state x%x nrport x%px remoteport x%px\n",
                         ndlp->nlp_DID, ndlp->nlp_type, ndlp->nlp_state,
                         nrport, remoteport);

        if (!nrport || !remoteport)
                goto rescan_exit;

        /* Only rescan if we are an NVME target in the MAPPED state */
        if (remoteport->port_role & FC_PORT_ROLE_NVME_DISCOVERY &&
            ndlp->nlp_state == NLP_STE_MAPPED_NODE) {
                nvme_fc_rescan_remoteport(remoteport);

                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                 "6172 NVME rescanned DID x%06x "
                                 "port_state x%x\n",
                                 ndlp->nlp_DID, remoteport->port_state);
        }
        return;
 rescan_exit:
        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6169 Skip NVME Rport Rescan, NVME remoteport "
                         "unregistered\n");
#endif
}

/* 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)
{
#if (IS_ENABLED(CONFIG_NVME_FC))
        int ret;
        struct nvme_fc_local_port *localport;
        struct lpfc_nvme_lport *lport;
        struct lpfc_nvme_rport *rport;
        struct nvme_fc_remote_port *remoteport = NULL;

        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;

        spin_lock_irq(&vport->phba->hbalock);
        rport = lpfc_ndlp_get_nrport(ndlp);
        if (rport)
                remoteport = rport->remoteport;
        spin_unlock_irq(&vport->phba->hbalock);
        if (!remoteport)
                goto input_err;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
                         "6033 Unreg nvme remoteport x%px, 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) {
                /* No concern about the role change on the nvme remoteport.
                 * The transport will update it.
                 */
                ndlp->upcall_flags |= NLP_WAIT_FOR_UNREG;

                /* Don't let the host nvme transport keep sending keep-alives
                 * on this remoteport. Vport is unloading, no recovery. The
                 * return values is ignored.  The upcall is a courtesy to the
                 * transport.
                 */
                if (vport->load_flag & FC_UNLOADING)
                        (void)nvme_fc_set_remoteport_devloss(remoteport, 0);

                ret = nvme_fc_unregister_remoteport(remoteport);
                if (ret != 0) {
                        lpfc_nlp_put(ndlp);
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
                                         "6167 NVME unregister failed %d "
                                         "port_state x%x\n",
                                         ret, remoteport->port_state);
                }
        }
        return;

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

/**
 * lpfc_sli4_nvme_xri_aborted - Fast-path process of NVME xri abort
 * @phba: pointer to lpfc hba data structure.
 * @axri: pointer to the fcp xri abort wcqe structure.
 * @lpfc_ncmd: The nvme job structure for the request being aborted.
 *
 * This routine is invoked by the worker thread to process a SLI4 fast-path
 * NVME aborted xri.  Aborted NVME IO commands are completed to the transport
 * here.
 **/
void
lpfc_sli4_nvme_xri_aborted(struct lpfc_hba *phba,
                           struct sli4_wcqe_xri_aborted *axri,
                           struct lpfc_io_buf *lpfc_ncmd)
{
        uint16_t xri = bf_get(lpfc_wcqe_xa_xri, axri);
        struct nvmefc_fcp_req *nvme_cmd = NULL;
        struct lpfc_nodelist *ndlp = lpfc_ncmd->ndlp;


        if (ndlp)
                lpfc_sli4_abts_err_handler(phba, ndlp, axri);

        lpfc_printf_log(phba, KERN_INFO, LOG_NVME_ABTS,
                        "6311 nvme_cmd %p xri x%x tag x%x abort complete and "
                        "xri released\n",
                        lpfc_ncmd->nvmeCmd, xri,
                        lpfc_ncmd->cur_iocbq.iotag);

        /* Aborted NVME commands are required to not complete
         * before the abort exchange command fully completes.
         * Once completed, it is available via the put list.
         */
        if (lpfc_ncmd->nvmeCmd) {
                nvme_cmd = lpfc_ncmd->nvmeCmd;
                nvme_cmd->done(nvme_cmd);
                lpfc_ncmd->nvmeCmd = NULL;
        }
        lpfc_release_nvme_buf(phba, lpfc_ncmd);
}

/**
 * lpfc_nvme_wait_for_io_drain - Wait for all NVME wqes to complete
 * @phba: Pointer to HBA context object.
 *
 * This function flushes all wqes in the nvme rings and frees all resources
 * in the txcmplq. This function does not issue abort wqes for the IO
 * commands in txcmplq, they will just be returned with
 * IOERR_SLI_DOWN. This function is invoked with EEH when device's PCI
 * slot has been permanently disabled.
 **/
void
lpfc_nvme_wait_for_io_drain(struct lpfc_hba *phba)
{
        struct lpfc_sli_ring  *pring;
        u32 i, wait_cnt = 0;

        if (phba->sli_rev < LPFC_SLI_REV4 || !phba->sli4_hba.hdwq)
                return;

        /* Cycle through all IO rings and make sure all outstanding
         * WQEs have been removed from the txcmplqs.
         */
        for (i = 0; i < phba->cfg_hdw_queue; i++) {
                if (!phba->sli4_hba.hdwq[i].io_wq)
                        continue;
                pring = phba->sli4_hba.hdwq[i].io_wq->pring;

                if (!pring)
                        continue;

                /* Retrieve everything on the txcmplq */
                while (!list_empty(&pring->txcmplq)) {
                        msleep(LPFC_XRI_EXCH_BUSY_WAIT_T1);
                        wait_cnt++;

                        /* The sleep is 10mS.  Every ten seconds,
                         * dump a message.  Something is wrong.
                         */
                        if ((wait_cnt % 1000) == 0) {
                                lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
                                                "6178 NVME IO not empty, "
                                                "cnt %d\n", wait_cnt);
                        }
                }
        }
}

void
lpfc_nvme_cancel_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn)
{
#if (IS_ENABLED(CONFIG_NVME_FC))
        struct lpfc_io_buf *lpfc_ncmd;
        struct nvmefc_fcp_req *nCmd;
        struct lpfc_nvme_fcpreq_priv *freqpriv;

        if (!pwqeIn->context1) {
                lpfc_sli_release_iocbq(phba, pwqeIn);
                return;
        }
        /* For abort iocb just return, IO iocb will do a done call */
        if (bf_get(wqe_cmnd, &pwqeIn->wqe.gen_req.wqe_com) ==
            CMD_ABORT_XRI_CX) {
                lpfc_sli_release_iocbq(phba, pwqeIn);
                return;
        }
        lpfc_ncmd = (struct lpfc_io_buf *)pwqeIn->context1;

        spin_lock(&lpfc_ncmd->buf_lock);
        if (!lpfc_ncmd->nvmeCmd) {
                spin_unlock(&lpfc_ncmd->buf_lock);
                lpfc_release_nvme_buf(phba, lpfc_ncmd);
                return;
        }

        nCmd = lpfc_ncmd->nvmeCmd;
        lpfc_printf_log(phba, KERN_INFO, LOG_NVME_IOERR,
                        "6194 NVME Cancel xri %x\n",
                        lpfc_ncmd->cur_iocbq.sli4_xritag);

        nCmd->transferred_length = 0;
        nCmd->rcv_rsplen = 0;
        nCmd->status = NVME_SC_INTERNAL;
        freqpriv = nCmd->private;
        freqpriv->nvme_buf = NULL;
        lpfc_ncmd->nvmeCmd = NULL;

        spin_unlock(&lpfc_ncmd->buf_lock);
        nCmd->done(nCmd);

        /* Call release with XB=1 to queue the IO into the abort list. */
        lpfc_release_nvme_buf(phba, lpfc_ncmd);
#endif
}