text: /*******************************************************************
   * This file is part of the Emulex Linux Device Driver for         *
   * Fibre Channel Host Bus Adapters.                                *
   * Copyright (C) 2017-2021 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;
  
  /**
   * lpfc_nvme_create_queue -
   * @pnvme_lport: Transport localport that LS is to be issued from
   * @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;
  	u32 fc4_xpt_flags;
  
  	ndlp = rport->ndlp;
  	if (!ndlp) {
  		pr_err("**** %s: NULL ndlp on rport x%px remoteport x%px\n",
  		       __func__, rport, remoteport);
  		goto rport_err;
  	}
  
  	vport = ndlp->vport;
  	if (!vport) {
  		pr_err("**** %s: Null vport on ndlp x%px, ste x%x rport x%px\n",
  		       __func__, ndlp, ndlp->nlp_state, rport);
  		goto rport_err;
  	}
  
  	fc4_xpt_flags = NVME_XPT_REGD | SCSI_XPT_REGD;
  
  	/* 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, ndlp x%px "
  			 "DID x%x xflags x%x\n",
  			 remoteport, ndlp, ndlp->nlp_DID, ndlp->fc4_xpt_flags);
  	spin_lock_irq(&ndlp->lock);
  
  	/* The register rebind might have occurred before the delete
  	 * downcall.  Guard against this race.
  	 */
  	if (ndlp->fc4_xpt_flags & NVME_XPT_UNREG_WAIT)
  		ndlp->fc4_xpt_flags &= ~(NVME_XPT_UNREG_WAIT | NVME_XPT_REGD);
  
  	spin_unlock_irq(&ndlp->lock);
  
  	/* On a devloss timeout event, one more put is executed provided the
  	 * NVME and SCSI rport unregister requests are complete.  If the vport
  	 * is unloading, this extra put is executed by lpfc_drop_node.
  	 */
  	if (!(ndlp->fc4_xpt_flags & fc4_xpt_flags))
  		lpfc_disc_state_machine(vport, ndlp, NULL, NLP_EVT_DEVICE_RM);
  
   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 x%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 x%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);
  	if (!genwqe->context1) {
  		dev_warn(&phba->pcidev->dev,
  			 "Warning: Failed node ref, not sending LS_REQ\n");
  		lpfc_sli_release_iocbq(phba, genwqe);
  		return 1;
  	}
  
  	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, tmo);
  	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_nlp_put(ndlp);
  		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) {
  		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;
  	}
  
  	if (!vport->phba->sli4_hba.nvmels_wq)
  		return -ENOMEM;
  
  	/*
  	 * 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,
  				pnvme_lsreq->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.
   * @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 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%px 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, NULL);
  	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%px\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_nodelist *ndlp;
  	int ret;
  
  	lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
  	if (unlikely(!lport))
  		return;
  	vport = lport->vport;
  
  	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;
  	uint32_t lat;
  	bool call_done = false;
  #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) {
  		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;
  
  			/* Check if this is really an ERSP */
  			if (nCmd->rcv_rsplen == LPFC_NVME_ERSP_LEN) {
  				lpfc_ncmd->status = IOSTAT_SUCCESS;
  				lpfc_ncmd->result = 0;
  
  				lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME,
  					 "6084 NVME Completion ERSP: "
  					 "xri %x placed x%x\n",
  					 lpfc_ncmd->cur_iocbq.sli4_xritag,
  					 wcqe->total_data_placed);
  				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;
  		call_done = true;
  	}
  	spin_unlock(&lpfc_ncmd->buf_lock);
  
  	/* Check if IO qualified for CMF */
  	if (phba->cmf_active_mode != LPFC_CFG_OFF &&
  	    nCmd->io_dir == NVMEFC_FCP_READ &&
  	    nCmd->payload_length) {
  		/* Used when calculating average latency */
  		lat = ktime_get_ns() - lpfc_ncmd->rx_cmd_start;
  		lpfc_update_cmf_cmpl(phba, lat, nCmd->payload_length, NULL);
  	}
  
  	if (call_done)
  		nCmd->done(nCmd);
  
  	/* 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
   * @lpfc_ncmd: 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;
  
  	/*
  	 * 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;
  
  			/* For a CMF Managed port, iod must be zero'ed */
  			if (phba->cmf_active_mode == LPFC_CFG_MANAGED)
  				bf_set(wqe_iod, &wqe->fcp_iread.wqe_com,
  				       LPFC_WQE_IOD_NONE);
  			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);
  
  	/* Word 10 */
  	bf_set(wqe_xchg, &wqe->fcp_iwrite.wqe_com, LPFC_NVME_XCHG);
  
  	/* 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
   * @lpfc_ncmd: 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);
  
  			/* Word 11 */
  			bf_set(wqe_pbde, &wqe->generic.wqe_com, 1);
  		} 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
   * @pnvme_lport: Pointer to the driver's local port data
   * @pnvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
   * @hw_queue_handle: Driver-returned handle in lpfc_nvme_create_queue
   * @pnvme_fcreq: IO request from nvme fc to driver.
   *
   * 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;
  	uint64_t start = 0;
  
  	/* 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) {
  		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->fc4_xpt_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;
  	}
  
  	/* Check if IO qualifies for CMF */
  	if (phba->cmf_active_mode != LPFC_CFG_OFF &&
  	    pnvme_fcreq->io_dir == NVMEFC_FCP_READ &&
  	    pnvme_fcreq->payload_length) {
  		ret = lpfc_update_cmf_cmd(phba, pnvme_fcreq->payload_length);
  		if (ret) {
  			ret = -EBUSY;
  			goto out_fail;
  		}
  		/* Get start time for IO latency */
  		start = ktime_get_ns();
  	}
  
  	/* 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_fail1;
  		}
  	}
  
  	/* 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_fail1;
  	}
  #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
  	lpfc_ncmd->rx_cmd_start = start;
  
  	/*
  	 * 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_fail1:
  	lpfc_update_cmf_cmpl(phba, LPFC_CGN_NOT_SENT,
  			     pnvme_fcreq->payload_length, NULL);
   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.
   * @abts_cmpl: Pointer to wcqe complete 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
   * @pnvme_lport: Pointer to the driver's local port data
   * @pnvme_rport: Pointer to the rport getting the @lpfc_nvme_ereq
   * @hw_queue_handle: Driver-returned handle in lpfc_nvme_create_queue
   * @pnvme_fcreq: IO request from nvme fc to driver.
   *
   * 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 *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 x%px xri x%x\n",
  				 pnvme_fcreq, lpfc_nbuf,
  				 nvmereq_wqe->sli4_xritag);
  		goto out_unlock;
  	}
  
  	ret_val = lpfc_sli4_issue_abort_iotag(phba, nvmereq_wqe,
  					      lpfc_nvme_abort_fcreq_cmpl);
  
  	spin_unlock(&lpfc_nbuf->buf_lock);
  	spin_unlock_irqrestore(&phba->hbalock, flags);
  
  	/* Make sure HBA is alive */
  	lpfc_issue_hb_tmo(phba);
  
  	if (ret_val != WQE_SUCCESS) {
  		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);
  		return;
  	}
  
  	lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_ABTS,
  			 "6138 Transport Abort NVME Request Issued for "
  			 "ox_id x%x\n",
  			 nvmereq_wqe->sli4_xritag);
  	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
   *
   * 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.
   * @vport: 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;
  	struct lpfc_sli4_hdw_queue *qp;
  	int abts_scsi, abts_nvme;
  
  	/* 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;
  			abts_scsi = 0;
  			abts_nvme = 0;
  			for (i = 0; i < phba->cfg_hdw_queue; i++) {
  				qp = &phba->sli4_hba.hdwq[i];
  				pring = qp->io_wq->pring;
  				if (!pring)
  					continue;
  				pending += pring->txcmplq_cnt;
  				abts_scsi += qp->abts_scsi_io_bufs;
  				abts_nvme += qp->abts_nvme_io_bufs;
  			}
  			lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
  					 "6176 Lport x%px Localport x%px wait "
  					 "timed out. Pending %d [%d:%d]. "
  					 "Renewing.\n",
  					 lport, vport->localport, pending,
  					 abts_scsi, abts_nvme);
  			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.
   * @vport: pointer to a host virtual N_Port 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(&ndlp->lock);
  	oldrport = lpfc_ndlp_get_nrport(ndlp);
  	if (oldrport) {
  		prev_ndlp = oldrport->ndlp;
  		spin_unlock_irq(&ndlp->lock);
  	} else {
  		spin_unlock_irq(&ndlp->lock);
  		if (!lpfc_nlp_get(ndlp)) {
  			dev_warn(&vport->phba->pcidev->dev,
  				 "Warning - No node ref - exit register\n");
  			return 0;
  		}
  	}
  
  	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(&ndlp->lock);
  		ndlp->fc4_xpt_flags &= ~NVME_XPT_UNREG_WAIT;
  		ndlp->fc4_xpt_flags |= NVME_XPT_REGD;
  		spin_unlock_irq(&ndlp->lock);
  		rport = remote_port->private;
  		if (oldrport) {
  
  			/* Sever the ndlp<->rport association
  			 * before dropping the ndlp ref from
  			 * register.
  			 */
  			spin_lock_irq(&ndlp->lock);
  			ndlp->nrport = NULL;
  			ndlp->fc4_xpt_flags &= ~NVME_XPT_UNREG_WAIT;
  			spin_unlock_irq(&ndlp->lock);
  			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 (!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(&ndlp->lock);
  		ndlp->nrport = rport;
  		spin_unlock_irq(&ndlp->lock);
  		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(&ndlp->lock);
  	nrport = lpfc_ndlp_get_nrport(ndlp);
  	if (nrport)
  		remoteport = nrport->remoteport;
  	spin_unlock_irq(&ndlp->lock);
  
  	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(&ndlp->lock);
  	rport = lpfc_ndlp_get_nrport(ndlp);
  	if (rport)
  		remoteport = rport->remoteport;
  	spin_unlock_irq(&ndlp->lock);
  	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 "
  			 "refcnt %d\n",
  			 remoteport, remoteport->port_name,
  			 remoteport->port_id, remoteport->port_state,
  			 ndlp->nlp_type, kref_read(&ndlp->kref));
  
  	/* 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.
  		 */
  		spin_lock_irq(&vport->phba->hbalock);
  		ndlp->fc4_xpt_flags |= NVME_XPT_UNREG_WAIT;
  		spin_unlock_irq(&vport->phba->hbalock);
  
  		/* 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);
  
  		/* The driver no longer knows if the nrport memory is valid.
  		 * because the controller teardown process has begun and
  		 * is asynchronous.  Break the binding in the ndlp. Also
  		 * remove the register ndlp reference to setup node release.
  		 */
  		ndlp->nrport = NULL;
  		lpfc_nlp_put(ndlp);
  		if (ret != 0) {
  			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);
  			}
  		}
  	}
  
  	/* Make sure HBA is alive */
  	lpfc_issue_hb_tmo(phba);
  
  }
  
  void
  lpfc_nvme_cancel_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn,
  		      uint32_t stat, uint32_t param)
  {
  #if (IS_ENABLED(CONFIG_NVME_FC))
  	struct lpfc_io_buf *lpfc_ncmd;
  	struct nvmefc_fcp_req *nCmd;
  	struct lpfc_wcqe_complete wcqe;
  	struct lpfc_wcqe_complete *wcqep = &wcqe;
  
  	lpfc_ncmd = (struct lpfc_io_buf *)pwqeIn->context1;
  	if (!lpfc_ncmd) {
  		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;
  	}
  
  	spin_lock(&lpfc_ncmd->buf_lock);
  	nCmd = lpfc_ncmd->nvmeCmd;
  	if (!nCmd) {
  		spin_unlock(&lpfc_ncmd->buf_lock);
  		lpfc_release_nvme_buf(phba, lpfc_ncmd);
  		return;
  	}
  	spin_unlock(&lpfc_ncmd->buf_lock);
  
  	lpfc_printf_log(phba, KERN_INFO, LOG_NVME_IOERR,
  			"6194 NVME Cancel xri %x\n",
  			lpfc_ncmd->cur_iocbq.sli4_xritag);
  
  	wcqep->word0 = 0;
  	bf_set(lpfc_wcqe_c_status, wcqep, stat);
  	wcqep->parameter = param;
  	wcqep->word3 = 0; /* xb is 0 */
  
  	/* Call release with XB=1 to queue the IO into the abort list. */
  	if (phba->sli.sli_flag & LPFC_SLI_ACTIVE)
  		bf_set(lpfc_wcqe_c_xb, wcqep, 1);
  
  	(pwqeIn->wqe_cmpl)(phba, pwqeIn, wcqep);
  #endif
  }
  